{"id":2280,"date":"2021-04-27T01:59:51","date_gmt":"2021-04-27T01:59:51","guid":{"rendered":"https:\/\/zlqu95mfyr.wpdns.site\/?p=2280"},"modified":"2021-06-24T01:37:13","modified_gmt":"2021-06-24T01:37:13","slug":"harsle-sequence-valve-circuits-of-hydraulic-press","status":"publish","type":"post","link":"https:\/\/www.avido.cn\/vi\/harsle-sequence-valve-circuits-of-hydraulic-press\/","title":{"rendered":"M\u1ea1ch tu\u1ea7n t\u1ef1 van c\u1ee7a m\u00e1y \u00e9p th\u1ee7y l\u1ef1c"},"content":{"rendered":"

<\/span>Th\u1eddi gian \u0111\u1ecdc \u01b0\u1edbc t\u00ednh: <\/span>18<\/span> ph\u00fat<\/span><\/p>\n\n\n\n

V\u1ea5n \u0111\u1ec1 1: C\u00e1ch th\u1ef1c hi\u1ec7n m\u1ea1ch tu\u1ea7n t\u1ef1<\/strong><\/h3>\n\n\n\n

1. M\u1ea1ch v\u1edbi c\u00e1c t\u1ea3i kh\u00e1c nhau \u0111\u1ec3 t\u1ef1 \u0111\u1ed9ng \u0111i\u1ec1u khi\u1ec3n tr\u00ecnh t\u1ef1 ho\u1ea1t \u0111\u1ed9ng c\u1ee7a xi lanh<\/strong><\/strong><\/p>\n\n\n\n

H\u00ecnh 1-1 cho th\u1ea5y hai xi lanh c\u00f3 c\u00f9ng di\u1ec7n t\u00edch piston nh\u01b0ng t\u1ea3i tr\u1ecdng l\u00e0m vi\u1ec7c kh\u00e1c nhau. Tr\u00ecnh t\u1ef1 t\u00e1c \u0111\u1ed9ng l\u00e0 1 in v\u00e0 2 in khi piston chuy\u1ec3n \u0111\u1ed9ng t\u1ecbnh ti\u1ebfn; 1 in v\u00e0 2 in khi piston chuy\u1ec3n \u0111\u1ed9ng l\u00f9i.<\/p>\n\n\n\n

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1-1 M\u1ea1ch \u0111\u1ec3 \u0111i\u1ec1u khi\u1ec3n t\u1ef1 \u0111\u1ed9ng tr\u00ecnh t\u1ef1 ho\u1ea1t \u0111\u1ed9ng c\u1ee7a xi lanh v\u1edbi c\u00e1c t\u1ea3i kh\u00e1c nhau<\/figcaption><\/figure><\/div>\n\n\n\n

2. M\u1ea1ch h\u00e0nh \u0111\u1ed9ng tu\u1ea7n t\u1ef1 s\u1eed d\u1ee5ng van tu\u1ea7n t\u1ef1<\/strong><\/strong><\/p>\n\n\n\n

Trong m\u1ea1ch, \u1edf H\u00ecnh 1-2, m\u1ed9t van tu\u1ea7n t\u1ef1 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 l\u00e0m cho c\u00e1c xi lanh l\u00e0m vi\u1ec7c theo tr\u00ecnh t\u1ef1 1-2-3-4. Trong m\u1ea1ch ho\u1ea1t \u0111\u1ed9ng tu\u1ea7n t\u1ef1 v\u1edbi van tu\u1ea7n t\u1ef1, \u00e1p su\u1ea5t c\u00e0i \u0111\u1eb7t c\u1ee7a van tu\u1ea7n t\u1ef1 ph\u1ea3i l\u1edbn h\u01a1n \u00e1p su\u1ea5t d\u1ea7u ho\u1ea1t \u0111\u1ed9ng t\u1ed1i \u0111a c\u1ee7a xi lanh \u1edf h\u00e0nh tr\u00ecnh tr\u01b0\u1edbc, n\u1ebfu kh\u00f4ng s\u1ebd x\u1ea3y ra hi\u1ec7n t\u01b0\u1ee3ng t\u00e1c \u0111\u1ed9ng tr\u01b0\u1edbc (t\u1ee9c l\u00e0 h\u00e0nh tr\u00ecnh tr\u01b0\u1edbc ch\u01b0a k\u1ebft th\u00fac v\u00e0 h\u00e0nh tr\u00ecnh ti\u1ebfp theo \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t) s\u1ebd x\u1ea3y ra.<\/p>\n\n\n\n

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1-2 M\u1ea1ch h\u00e0nh \u0111\u1ed9ng tu\u1ea7n t\u1ef1 s\u1eed d\u1ee5ng van tu\u1ea7n t\u1ef1<\/figcaption><\/figure><\/div>\n\n\n\n

3. M\u1ea1ch tu\u1ea7n t\u1ef1 v\u1edbi van \u0111\u1ea3o chi\u1ec1u ho\u1ea1t \u0111\u1ed9ng b\u1eb1ng cam<\/strong><\/strong><\/p>\n\n\n\n

H\u00ecnh 1-3 m\u00f4 t\u1ea3 m\u1ed9t m\u1ea1ch tu\u1ea7n t\u1ef1 s\u1eed d\u1ee5ng van \u0111\u1ea3o chi\u1ec1u b\u1ed1n chi\u1ec1u ho\u1ea1t \u0111\u1ed9ng b\u1eb1ng cam. Th\u1eddi gian b\u1eaft \u0111\u1ea7u c\u1ee7a h\u00e0nh \u0111\u1ed9ng tr\u00ecnh t\u1ef1 ti\u1ebfp theo c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1eb1ng c\u00e1ch thay \u0111\u1ed5i v\u1ecb tr\u00ed c\u1ee7a thanh ram tr\u00ean c\u1ea7n piston v\u00e0 van \u0111\u1ea3o chi\u1ec1u ho\u1ea1t \u0111\u1ed9ng b\u1eb1ng cam. Tr\u00ecnh t\u1ef1 c\u1ee7a h\u00e0nh \u0111\u1ed9ng \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n b\u1eb1ng c\u00e1c m\u0169i t\u00ean tr\u00ean s\u01a1 \u0111\u1ed3.<\/p>\n\n\n\n

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1-3 M\u1ea1ch tu\u1ea7n t\u1ef1 s\u1eed d\u1ee5ng van \u0111\u1ecbnh h\u01b0\u1edbng b\u1ed1n chi\u1ec1u v\u1eadn h\u00e0nh b\u1eb1ng cam<\/figcaption><\/figure><\/div>\n\n\n\n

4. M\u1ea1ch c\u00f3 t\u00e1c \u0111\u1ed9ng qua l\u1ea1i li\u00ean t\u1ee5c<\/strong><\/strong><\/p>\n\n\n\n

Xi lanh k\u1eb9p trong H\u00ecnh 1-4 \u0111\u01b0\u1ee3c v\u1eadn h\u00e0nh b\u1edfi m\u1ed9t van \u0111\u1ea3o chi\u1ec1u b\u1eb1ng tay. Sau khi k\u1eb9p ph\u00f4i, d\u1ea7u c\u00f3 \u00e1p su\u1ea5t \u0111\u01b0\u1ee3c chuy\u1ec3n \u0111\u1ebfn xi lanh l\u00e0m vi\u1ec7c qua van tu\u1ea7n t\u1ef1 v\u00e0 \u0111\u01b0\u1ee3c pitt\u00f4ng t\u1ef1 chuy\u1ec3n \u0111\u1ed9ng. Khi nh\u1ea3 k\u1eb9p, van \u0111\u1ea3o chi\u1ec1u b\u1eb1ng tay \u0111\u01b0\u1ee3c ph\u1ee5c h\u1ed3i v\u00e0 xi lanh l\u00e0m vi\u1ec7c ng\u1eebng ho\u1ea1t \u0111\u1ed9ng.<\/p>\n\n\n\n

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1-4 M\u1ea1ch t\u00e1c \u0111\u1ed9ng qua l\u1ea1i li\u00ean t\u1ee5c<\/figcaption><\/figure><\/div>\n\n\n\n

5. M\u1ea1ch tu\u1ea7n t\u1ef1 s\u1eed d\u1ee5ng xi lanh tu\u1ea7n t\u1ef1<\/strong><\/strong><\/p>\n\n\n\n

H\u00ecnh 1-5, M\u1ed9t xi lanh d\u00f9ng \u0111\u1ec3 c\u1ed1 \u0111\u1ecbnh thanh piston, xi lanh chuy\u1ec3n \u0111\u1ed9ng \u0111\u01a1n gi\u1ea3n; Xi lanh B cho xi lanh c\u1ed1 \u0111\u1ecbnh \u0111\u01a1n gi\u1ea3n, thanh piston chuy\u1ec3n \u0111\u1ed9ng. \u0110\u1ec3 ho\u00e0n th\u00e0nh chu\u1ed7i h\u00e0nh \u0111\u1ed9ng: 1YA nh\u1eadn l\u1ef1c, 1-A tr\u1ee5 sang ph\u1ea3i, 2- B tr\u1ee5 chuy\u1ec3n \u0111\u1ed9ng xu\u1ed1ng; 2YA nh\u1eadn c\u00f4ng su\u1ea5t, h\u00ecnh tr\u1ee5 3-A tr\u1edf l\u1ea1i chuy\u1ec3n \u0111\u1ed9ng b\u00ean tr\u00e1i, h\u00ecnh tr\u1ee5 4-B tr\u1edf l\u1ea1i chuy\u1ec3n \u0111\u1ed9ng l\u00ean tr\u00ean.<\/p>\n\n\n\n

Nh\u01b0 h\u00ecnh 1-5, t\u1eeb van \u0111\u1ea3o chi\u1ec1u \u0111i\u1ec7n t\u1eeb tr\u1ef1c ti\u1ebfp \u0111\u1ebfn \u0111\u01b0\u1eddng \u1ed1ng c\u1ee7a xi lanh B, n\u1ed1i ti\u1ebfp v\u00e0o van m\u1ed9t chi\u1ec1u, ch\u1ec9 cho ph\u00e9p xi lanh B x\u1ea3 d\u00f2ng d\u1ea7u \u0111i qua, v\u00e0 v\u00e0o xi lanh B \u00e1p su\u1ea5t d\u1ea7u ph\u1ea3i th\u00f4ng qua tr\u00ecnh t\u1ef1 xi lanh A, do v\u1ecb tr\u00ed c\u1ee7a pitt\u00f4ng xi lanh A \u0111\u1ed1i v\u1edbi xi lanh B v\u00e0o \u0111\u01b0\u1eddng \u1ed1ng d\u1eabn \u0111\u00f3ng vai tr\u00f2 c\u1ee7a \u0111\u1ea7u sau khi kh\u1edfi \u0111\u1ed9ng. Khi h\u00e0nh tr\u00ecnh c\u1ee7a piston xilanh k\u1ebft th\u00fac th\u00ec ch\u1ec9 khi \u0111\u00f3 m\u1edbi m\u1edf m\u1ea1ch d\u1ea7u t\u1edbi xilanh B, do \u0111\u00f3 l\u00e0m cho xilanh A. B th\u1ef1c hi\u1ec7n \u0111\u01b0\u1ee3c \u0111\u1ed9ng t\u00e1c tu\u1ea7n t\u1ef1.<\/p>\n\n\n\n

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1-5 M\u1ea1ch tu\u1ea7n t\u1ef1 s\u1eed d\u1ee5ng xi lanh tu\u1ea7n t\u1ef1<\/figcaption><\/figure><\/div>\n\n\n\n

6. M\u1ea1ch tu\u1ea7n t\u1ef1 \u0111\u1ec3 \u0111i\u1ec1u khi\u1ec3n \u0111i\u1ec7n<\/strong><\/strong><\/p>\n\n\n\n

Trong m\u1ea1ch tr\u00ecnh t\u1ef1 \u0111i\u1ec1u khi\u1ec3n \u0111i\u1ec7n H\u00ecnh 1-6, c\u00f3 c\u00f4ng t\u1eafc h\u00e0nh tr\u00ecnh v\u00e0 van \u0111\u1ea3o chi\u1ec1u \u0111i\u1ec7n t\u1eeb \u0111\u1ec3 thao t\u00e1c t\u1ed1t h\u01a1n, thi\u1ebft b\u1ecb \u0111i\u1ec7n linh ho\u1ea1t, thao t\u00e1c t\u1ef1 \u0111\u1ed9ng nhanh ch\u00f3ng. Khi h\u00e0nh tr\u00ecnh k\u1ebft th\u00fac, c\u00f4ng t\u1eafc h\u00e0nh tr\u00ecnh A \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t \u0111\u1ec3 kh\u1eed n\u0103ng l\u01b0\u1ee3ng van \u0111\u1ea3o chi\u1ec1u ho\u1ea1t \u0111\u1ed9ng b\u1eb1ng \u0111i\u1ec7n t\u1eeb 2 v\u00e0 xi lanh b\u00ean ph\u1ea3i ho\u1ea1t \u0111\u1ed9ng theo h\u01b0\u1edbng m\u0169i t\u00ean 4.<\/p>\n\n\n\n

Van tu\u1ea7n t\u1ef1 \u0111\u01b0\u1ee3c l\u1eafp n\u1ed1i ti\u1ebfp trong m\u1ea1ch d\u1ea7u c\u1ee7a m\u1ed7i xi lanh \u0111\u1ec3 trong qu\u00e1 tr\u00ecnh chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a m\u1ed9t xi lanh, s\u1ef1 s\u1ee5t \u00e1p c\u1ee7a c\u00e1c xi lanh kh\u00e1c s\u1ebd kh\u00f4ng b\u1ecb \u1ea3nh h\u01b0\u1edfng.<\/p>\n\n\n\n

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1-6 M\u1ea1ch tu\u1ea7n t\u1ef1 \u0111i\u1ec1u khi\u1ec3n \u0111i\u1ec7n<\/figcaption><\/figure><\/div>\n\n\n\n

V\u1ea5n \u0111\u1ec1 2: H\u00e0nh \u0111\u1ed9ng tu\u1ea7n t\u1ef1 kh\u00f4ng \u0111\u00fang<\/strong><\/h3>\n\n\n\n

Trong v\u00ed d\u1ee5 v\u1ec1 h\u1ec7 th\u1ed1ng c\u00f3 van th\u1ee9 t\u1ef1 \u0111\u01b0\u1ee3c ch\u1ecdn kh\u00f4ng ph\u00f9 h\u1ee3p trong H\u00ecnh 1-7, m\u00e1y b\u01a1m th\u1ee7y l\u1ef1c l\u00e0 m\u1ed9t m\u00e1y b\u01a1m \u0111\u1ecbnh l\u01b0\u1ee3ng v\u00e0 m\u1ea1ch m\u00e0 xi lanh th\u1ee7y l\u1ef1c A thu\u1ed9c v\u1ec1 l\u00e0 m\u1ea1ch \u0111i\u1ec1u khi\u1ec3n t\u1ed1c \u0111\u1ed9 \u0111i\u1ec1u ti\u1ebft \u0111\u1ea7u v\u00e0o. T\u1ea3i tr\u1ecdng c\u1ee7a xi lanh th\u1ee7y l\u1ef1c A b\u1eb1ng 1\/2 t\u1ea3i c\u1ee7a xi lanh th\u1ee7y l\u1ef1c B. Van th\u1ee9 t\u1ef1 4 \u0111\u01b0\u1ee3c \u0111\u1eb7t ph\u00eda tr\u01b0\u1edbc xi lanh th\u1ee7y l\u1ef1c B v\u00e0 c\u00e0i \u0111\u1eb7t \u00e1p su\u1ea5t c\u1ee7a n\u00f3 th\u1ea5p h\u01a1n 1MPa so v\u1edbi t\u1ea3i tr\u1ecdng c\u1ee7a van x\u1ea3 2. Tr\u00ecnh t\u1ef1 ho\u1ea1t \u0111\u1ed9ng c\u1ee7a xi lanh th\u1ee7y l\u1ef1c Y\u00eau c\u1ea7u ho\u00e0n th\u00e0nh sau t\u00e1c \u0111\u1ed9ng c\u1ee7a xi lanh A v\u00e0 sau \u0111\u00f3 l\u00e0 t\u00e1c \u0111\u1ed9ng c\u1ee7a xi lanh B. Tuy nhi\u00ean, khi b\u01a1m th\u1ee7y l\u1ef1c \u0111\u01b0\u1ee3c kh\u1edfi \u0111\u1ed9ng v\u00e0 van \u0111\u1ea3o chi\u1ec1u \u0111i\u1ec7n t\u1eeb \u0111\u01b0\u1ee3c c\u1ea5p \u0111i\u1ec7n, v\u1ecb tr\u00ed b\u00ean tr\u00e1i ho\u1ea1t \u0111\u1ed9ng, xi lanh th\u1ee7y l\u1ef1c A v\u00e0 B ho\u1ea1t \u0111\u1ed9ng nh\u01b0 nhau th\u1eddi gian, kh\u00f4ng th\u1ec3 nh\u1eadn ra tr\u00ecnh t\u1ef1 c\u1ee7a A xi lanh h\u00e0nh \u0111\u1ed9ng \u0111\u1ea7u ti\u00ean, B xi lanh sau khi h\u00e0nh \u0111\u1ed9ng.<\/p>\n\n\n\n

L\u00e0 xi lanh th\u1ee7y l\u1ef1c B tr\u01b0\u1edbc khi l\u1eafp \u0111\u1eb7t van tr\u00ecnh t\u1ef1 \u0111i\u1ec1u khi\u1ec3n tr\u1ef1c ti\u1ebfp, c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 van tr\u00ecnh t\u1ef1 ki\u1ec3m so\u00e1t n\u1ed9i b\u1ed9. Khi van x\u1ea3 tr\u00e0n, \u00e1p su\u1ea5t l\u00e0m vi\u1ec7c c\u1ee7a h\u1ec7 th\u1ed1ng \u0111\u00e3 \u0111\u1ea1t \u0111\u1ebfn \u00e1p su\u1ea5t \u0111\u1ec3 m\u1edf van tu\u1ea7n t\u1ef1. V\u1edbi lo\u1ea1i van tu\u1ea7n t\u1ef1 n\u00e0y, xi lanh th\u1ee7y l\u1ef1c B ch\u1ec9 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c v\u1eadn h\u00e0nh m\u00e0 kh\u00f4ng c\u1ea7n t\u00e1c \u0111\u1ed9ng tr\u01b0\u1edbc, nh\u01b0ng kh\u00f4ng t\u00e1c \u0111\u1ed9ng sau.<\/p>\n\n\n\n

N\u1ebfu m\u1ea1ch \u0111\u01b0\u1ee3c c\u1ea3i ti\u1ebfn, nh\u01b0 trong H\u00ecnh 1-7 b, van tu\u1ea7n t\u1ef1 \u0111i\u1ec1u khi\u1ec3n tr\u1ef1c ti\u1ebfp 4 \u0111\u01b0\u1ee3c thay th\u1ebf b\u1eb1ng van tu\u1ea7n t\u1ef1 \u0111i\u1ec1u khi\u1ec3n t\u1eeb xa v\u00e0 m\u1ea1ch \u0111i\u1ec1u khi\u1ec3n t\u1eeb xa c\u1ee7a van tu\u1ea7n t\u1ef1 \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i gi\u1eefa xi lanh th\u1ee7y l\u1ef1c A v\u00e0 van ti\u1ebft l\u01b0u, sao cho vi\u1ec7c \u0111\u00f3ng m\u1edf c\u1ee7a van th\u1ee9 t\u1ef1 \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1edfi \u00e1p su\u1ea5t t\u1ea3i c\u1ee7a xi lanh th\u1ee7y l\u1ef1c A, kh\u00f4ng ph\u1ee5 thu\u1ed9c v\u00e0o \u00e1p su\u1ea5t \u0111\u1ea7u v\u00e0o c\u1ee7a van th\u1ee9 t\u1ef1. Do \u0111\u00f3, \u00e1p su\u1ea5t \u0111i\u1ec1u khi\u1ec3n c\u1ee7a van tu\u1ea7n t\u1ef1 \u0111i\u1ec1u khi\u1ec3n t\u1eeb xa \u0111\u01b0\u1ee3c \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ebfn \u00e1p su\u1ea5t cao h\u01a1n m\u1ed9t ch\u00fat so v\u1edbi \u00e1p su\u1ea5t t\u1ea3i c\u1ee7a xi lanh th\u1ee7y l\u1ef1c A, \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c tr\u00ecnh t\u1ef1 c\u1ee7a xi lanh A t\u00e1c \u0111\u1ed9ng tr\u01b0\u1edbc v\u00e0 xi lanh B t\u00e1c \u0111\u1ed9ng sau. Qu\u00e1 tr\u00ecnh t\u00e1c \u0111\u1ed9ng l\u00e0: kh\u1edfi \u0111\u1ed9ng b\u01a1m th\u1ee7y l\u1ef1c \u0111\u1ec3 \u0111i\u1ec1u ch\u1ec9nh \u00e1p su\u1ea5t tr\u01b0\u1edbc van gi\u1ea3m \u00e1p, van \u0111\u1ea3o chi\u1ec1u \u0111i\u1ec7n t\u1eeb \u0111\u00f3ng \u0111i\u1ec7n t\u1eeb v\u1ecb tr\u00ed sang tr\u00e1i l\u00e0m vi\u1ec7c, \u00e1p su\u1ea5t ph\u1ea7n d\u1ea7u qua van ti\u1ebft l\u01b0u v\u00e0o xi lanh th\u1ee7y l\u1ef1c A. \u0110\u1ea9y xi lanh A chuy\u1ec3n \u0111\u1ed9ng, m\u1ed9t ph\u1ea7n \u00e1p su\u1ea5t. d\u1ea7u do van x\u1ea3 tr\u00e0n tr\u1edf l\u1ea1i b\u1ec3 ch\u1ee9a. Khi xi lanh th\u1ee7y l\u1ef1c A chuy\u1ec3n \u0111\u1ed9ng \u0111\u1ebfn cu\u1ed1i, \u00e1p su\u1ea5t t\u1ea3i c\u1ee7a n\u00f3 nhanh ch\u00f3ng t\u0103ng l\u00ean v\u00e0 \u0111\u1ea1t \u0111\u1ebfn \u00e1p su\u1ea5t \u0111i\u1ec1u khi\u1ec3n c\u1ee7a van tu\u1ea7n t\u1ef1 \u0111i\u1ec1u khi\u1ec3n t\u1eeb xa, m\u1ea1ch d\u1ea7u ch\u00ednh c\u1ee7a van \u0111i\u1ec1u khi\u1ec3n t\u1eeb xa \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i, xi lanh th\u1ee7y l\u1ef1c B b\u1eaft \u0111\u1ea7u t\u00e1c \u0111\u1ed9ng.<\/p>\n\n\n\n

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1-7 V\u00ed d\u1ee5 v\u1ec1 h\u1ec7 th\u1ed1ng c\u00f3 c\u00e1c van th\u1ee9 t\u1ef1 \u0111\u01b0\u1ee3c ch\u1ecdn kh\u00f4ng \u0111\u00fang
1-B\u01a1m kh\u00f4ng \u0111\u1ed5i 2-Van gi\u1ea3m \u00e1p 3- Van \u0111i\u1ec7n t\u1eeb  
4-Van tu\u1ea7n t\u1ef1 5-B\u1ed9 \u0111i\u1ec1u ch\u1ec9nh 6,7- Van m\u1ed9t chi\u1ec1u<\/figcaption><\/figure><\/div>\n\n\n\n

C\u00e1c v\u1ea5n \u0111\u1ec1: <\/strong><\/strong><\/p>\n\n\n\n

Kh\u00f4ng th\u1ec3 k\u1ebft n\u1ed1i m\u1ea1ch d\u1ea7u \u0111i\u1ec1u khi\u1ec3n c\u1ee7a van tu\u1ea7n t\u1ef1 \u0111i\u1ec1u khi\u1ec3n t\u1eeb xa ph\u00eda tr\u01b0\u1edbc van ti\u1ebft l\u01b0u; \u00c1p su\u1ea5t c\u00e0i \u0111\u1eb7t c\u1ee7a van x\u1ea3 trong h\u1ec7 th\u1ed1ng th\u1ee7y l\u1ef1c ph\u1ea3i \u0111\u01b0\u1ee3c \u0111\u1eb7t theo \u00e1p su\u1ea5t t\u1ea3i c\u1ee7a xi lanh th\u1ee7y l\u1ef1c B, n\u1ebfu kh\u00f4ng s\u1ebd kh\u00f4ng th\u1ec3 lo\u1ea1i b\u1ecf \u0111\u01b0\u1ee3c l\u1ed7i n\u00eau tr\u00ean. Nguy\u00ean nh\u00e2n l\u00e0 do t\u1ea3i tr\u1ecdng c\u1ee7a xi lanh th\u1ee7y l\u1ef1c B g\u1ea5p 2 l\u1ea7n t\u1ea3i tr\u1ecdng c\u1ee7a xi lanh th\u1ee7y l\u1ef1c A. \u00c1p su\u1ea5t l\u00e0m vi\u1ec7c c\u1ee7a xi lanh th\u1ee7y l\u1ef1c B l\u00e0 \u00e1p su\u1ea5t cao nh\u1ea5t c\u1ee7a h\u1ec7 th\u1ed1ng th\u1ee7y l\u1ef1c, do \u0111\u00f3 \u00e1p su\u1ea5t l\u00e0m vi\u1ec7c c\u1ee7a c\u1ea3 h\u1ec7 th\u1ed1ng th\u1ee7y l\u1ef1c c\u1ea7n \u0111\u01b0\u1ee3c \u0111i\u1ec1u ch\u1ec9nh theo ho\u1ea1t \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng c\u1ee7a xi lanh th\u1ee7y l\u1ef1c B.<\/p>\n\n\n\n

V\u1ea5n \u0111\u1ec1 3: Kh\u00f4ng kh\u1edbp c\u00e1c gi\u00e1 tr\u1ecb c\u00e0i \u0111\u1eb7t \u00e1p su\u1ea5t<\/strong><\/h3>\n\n\n\n

1. Kh\u00f4ng kh\u1edbp gi\u1eefa gi\u00e1 tr\u1ecb c\u00e0i \u0111\u1eb7t \u00e1p su\u1ea5t c\u1ee7a van gi\u1ea3m \u00e1p v\u00e0 van tu\u1ea7n t\u1ef1<\/strong><\/strong><\/p>\n\n\n\n

Trong h\u1ec7 th\u1ed1ng th\u1ec3 hi\u1ec7n trong H\u00ecnh 1-8, b\u01a1m th\u1ee7y l\u1ef1c l\u00e0 \u0111\u1ecbnh l\u01b0\u1ee3ng, v\u00e0 van th\u1ee9 t\u1ef1 5 \u0111i\u1ec1u khi\u1ec3n xi lanh th\u1ee7y l\u1ef1c 6 sau khi xi lanh th\u1ee7y l\u1ef1c 7 \u0111\u00e3 chuy\u1ec3n \u0111\u1ebfn cu\u1ed1i chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a n\u00f3: Van th\u1ee9 t\u1ef1 4 \u0111i\u1ec1u khi\u1ec3n xi lanh th\u1ee7y l\u1ef1c 6 khi xi lanh th\u1ee7y l\u1ef1c 7 tr\u1edf v\u1ec1 v\u1ecb tr\u00ed ban \u0111\u1ea7u v\u00e0 sau \u0111\u00f3 b\u1eaft \u0111\u1ea7u chuy\u1ec3n \u0111\u1ed9ng quay tr\u1edf l\u1ea1i. Chuy\u1ec3n \u0111\u1ed9ng ch\u1eadm c\u1ee7a xi lanh th\u1ee7y l\u1ef1c 6 \u0111\u00e3 \u0111\u01b0\u1ee3c t\u00ecm th\u1ea5y trong h\u1ec7 th\u1ed1ng. C\u00e1c l\u00fd do ph\u1ed5 bi\u1ebfn d\u1eabn \u0111\u1ebfn t\u1ed1c \u0111\u1ed9 ch\u1eadm l\u00e0 t\u1ed1c \u0111\u1ed9 d\u00f2ng ch\u1ea3y c\u1ee7a b\u01a1m th\u1ee7y l\u1ef1c kh\u00f4ng \u0111\u1ea1t \u0111\u01b0\u1ee3c gi\u00e1 tr\u1ecb y\u00eau c\u1ea7u, r\u00f2 r\u1ec9 nghi\u00eam tr\u1ecdng b\u00ean trong van \u0111\u1ea3o chi\u1ec1u, r\u00f2 r\u1ec9 nghi\u00eam tr\u1ecdng b\u00ean trong xi lanh th\u1ee7y l\u1ef1c, v.v., nh\u01b0ng \u0111\u1ed1i v\u1edbi. C\u00e1c l\u1ed7i h\u1ec7 th\u1ed1ng tr\u00ean \u0111\u00e3 \u0111\u01b0\u1ee3c ki\u1ec3m tra v\u00e0 kh\u00f4ng n\u1eb1m trong s\u1ed1 c\u00e1c nguy\u00ean nh\u00e2n ph\u1ed5 bi\u1ebfn g\u00e2y ra c\u00e1c l\u1ed7i tr\u00ean.<\/p>\n\n\n\n

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1-8 V\u00ed d\u1ee5 v\u1ec1 m\u1ea1ch c\u00f3 c\u00e1c gi\u00e1 tr\u1ecb c\u00e0i \u0111\u1eb7t \u00e1p su\u1ea5t kh\u00f4ng kh\u1edbp
1-B\u01a1m \u0111\u1ecbnh l\u01b0\u1ee3ng 2-Van gi\u1ea3m \u00e1p  
3-Van \u0111\u1ea3o chi\u1ec1u ho\u1ea1t \u0111\u1ed9ng b\u1eb1ng \u0111i\u1ec7n t\u1eeb
4,5-Van tu\u1ea7n t\u1ef1 6,7-Xi lanh th\u1ee7y l\u1ef1c<\/figcaption><\/figure><\/div>\n\n\n\n

Khi ki\u1ec3m tra \u0111\u01b0\u1eddng \u1ed1ng h\u1ed3i l\u01b0u c\u1ee7a van x\u1ea3, ng\u01b0\u1eddi ta th\u1ea5y r\u1eb1ng khi xi lanh th\u1ee7y l\u1ef1c 6 chuy\u1ec3n \u0111\u1ed9ng, m\u1ed9t l\u01b0\u1ee3ng l\u1edbn d\u1ea7u ch\u1ea3y ra t\u1eeb \u0111\u01b0\u1eddng \u1ed1ng h\u1ed3i v\u00e0 van x\u1ea3 b\u1eaft \u0111\u1ea7u b\u1ecb tr\u00e0n, do \u0111\u00f3 ch\u1ee9ng t\u1ecf r\u1eb1ng \u00e1p su\u1ea5t c\u00e0i \u0111\u1eb7t c\u1ee7a van x\u1ea3 v\u00e0 van tu\u1ea7n t\u1ef1 kh\u00f4ng kh\u1edbp. N\u1ebfu \u00e1p su\u1ea5t c\u1ee7a van x\u1ea3 c\u0169ng \u0111\u01b0\u1ee3c \u0111i\u1ec1u ch\u1ec9nh theo gi\u00e1 tr\u1ecb n\u00e0y, van x\u1ea3 c\u0169ng s\u1ebd b\u1eaft \u0111\u1ea7u tr\u00e0n khi van tu\u1ea7n t\u1ef1 \u0111\u01b0\u1ee3c m\u1edf. N\u1ebfu \u0111i\u1ec1u ch\u1ec9nh \u00e1p su\u1ea5t c\u1ee7a van gi\u1ea3m \u00e1p cao h\u01a1n van th\u1ee9 t\u1ef1, nh\u01b0ng gi\u00e1 tr\u1ecb cao h\u01a1n kh\u00f4ng \u0111\u1ee7, khi xi lanh th\u1ee7y l\u1ef1c 6 trong qu\u00e1 tr\u00ecnh chuy\u1ec3n \u0111\u1ed9ng khi t\u1ea3i tr\u1ecdng b\u00ean ngo\u00e0i t\u0103ng l\u00ean, t\u1ee9c l\u00e0 \u00e1p su\u1ea5t l\u00e0m vi\u1ec7c c\u1ee7a xi lanh th\u1ee7y l\u1ef1c 6 \u0111\u1ea1t \u0111\u1ebfn \u00e1p su\u1ea5t c\u1ee7a van gi\u1ea3m \u00e1p, van x\u1ea3 s\u1ebd b\u1eaft \u0111\u1ea7u tr\u00e0n, chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a xi lanh th\u1ee7y l\u1ef1c 6 s\u1ebd ch\u1eadm l\u1ea1i. Do \u0111\u00f3, \u00e1p su\u1ea5t c\u1ee7a van gi\u1ea3m \u00e1p n\u00ean \u0111\u01b0\u1ee3c \u0111i\u1ec1u ch\u1ec9nh cao h\u01a1n 0,5 ~ 0,8MPa so v\u1edbi \u00e1p su\u1ea5t c\u1ee7a van th\u1ee9 t\u1ef1, \u0111\u1ec3 ch\u00fang kh\u1edbp v\u1edbi nhau, \u0111\u1ec3 lo\u1ea1i tr\u1eeb tr\u01b0\u1eddng h\u1ee3p h\u1ecfng h\u00f3c \u0111\u00f3.<\/p>\n\n\n\n

2. \u0110i\u1ec1u khi\u1ec3n van tu\u1ea7n t\u1ef1 m\u1ed9t chi\u1ec1u c\u1ee7a \u0111i\u1ec1u ch\u1ec9nh \u00e1p su\u1ea5t m\u1ea1ch h\u00e0nh \u0111\u1ed9ng theo tr\u00ecnh t\u1ef1 kh\u00f4ng th\u00edch h\u1ee3p<\/strong><\/p>\n\n\n\n

Nh\u01b0 trong H\u00ecnh 1-9, nguy\u00ean nh\u00e2n c\u1ee7a h\u00e0nh \u0111\u1ed9ng tu\u1ea7n t\u1ef1 l\u00e0 do \u0111i\u1ec1u ch\u1ec9nh \u00e1p su\u1ea5t kh\u00f4ng \u0111\u00fang c\u00e1ch. Ph\u01b0\u01a1ng ph\u00e1p \u0111i\u1ec1u ch\u1ec9nh \u0111\u00fang l\u00e0: sau khi di chuy\u1ec3n van 6 \u0111i\u1ec1u ch\u1ec9nh \u00e1p su\u1ea5t ph\u1ea3i cao h\u01a1n \u00e1p su\u1ea5t l\u00e0m vi\u1ec7c c\u1ee7a xi lanh 4 0,8 ~ 1MPa; \u00c1p su\u1ea5t \u0111i\u1ec1u ch\u1ec9nh van 3 ph\u1ea3i cao h\u01a1n \u00e1p su\u1ea5t l\u00e0m vi\u1ec7c c\u1ee7a xilanh 5 t\u00e1c \u0111\u1ed9ng l\u00f9i ba 0,8 ~ 1MPa, \u0111\u1ec3 tr\u00e1nh s\u1ef1 dao \u0111\u1ed9ng \u00e1p su\u1ea5t l\u00e0m vi\u1ec7c trong h\u1ec7 th\u1ed1ng l\u00e0m van tu\u1ea7n t\u1ef1 ho\u1ea1t \u0111\u1ed9ng sai.<\/p>\n\n\n\n

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1-9 M\u1ea1ch h\u00e0nh \u0111\u1ed9ng tu\u1ea7n t\u1ef1 \u0111\u01b0\u1ee3c \u0111i\u1ec1u khi\u1ec3n b\u1edfi van tu\u1ea7n t\u1ef1 m\u1ed9t chi\u1ec1u
1-Van gi\u1ea3m \u00e1p Van 2 chi\u1ec1u
3,6-Van tu\u1ea7n t\u1ef1 m\u1ed9t chi\u1ec1u 4,5-Xi lanh th\u1ee7y l\u1ef1c<\/figcaption><\/figure><\/div>\n\n\n\n

3. V\u1ea5n \u0111\u1ec1 \u0111\u1ed1i s\u00e1nh \u00e1p su\u1ea5t c\u1ee7a t\u1eebng th\u00e0nh ph\u1ea7n<\/strong><\/strong><\/p>\n\n\n\n

Vi\u1ec7c thi\u1ebft k\u1ebf m\u1ea1ch h\u00e0nh \u0111\u1ed9ng tu\u1ea7n t\u1ef1 \u0111\u01b0\u1ee3c \u0111i\u1ec1u khi\u1ec3n b\u1edfi r\u01a1 le \u00e1p su\u1ea5t l\u00e0 m\u1ed9t v\u1ea5n \u0111\u1ec1, l\u1ea5y h\u1ec7 th\u1ed1ng hai xi lanh l\u00e0m v\u00ed d\u1ee5 v\u00e0 thi\u1ebft l\u1eadp chu tr\u00ecnh tu\u1ea7n t\u1ef1 theo h\u00e0nh \u0111\u1ed9ng m\u1ed9t - h\u00e0nh \u0111\u1ed9ng hai, h\u00e0nh \u0111\u1ed9ng ba v\u00e0 h\u00e0nh \u0111\u1ed9ng b\u1ed1n.<\/p>\n\n\n\n

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1-10 M\u1ea1ch h\u00e0nh \u0111\u1ed9ng tu\u1ea7n t\u1ef1 \u0111\u01b0\u1ee3c \u0111i\u1ec1u khi\u1ec3n b\u1eb1ng r\u01a1 le \u00e1p su\u1ea5t
1-Xi lanh k\u1eb9p 2-Xi lanh c\u1ea5p li\u1ec7u  
3-Van \u0111i\u1ec7n t\u1eeb 4 chi\u1ec1u hai v\u1ecb tr\u00ed 4,7- Van m\u1ed9t chi\u1ec1u  
5-Van gi\u1ea3m \u00e1p 6-Van \u0111i\u1ec7n t\u1eeb b\u1ed1n chi\u1ec1u ba v\u1ecb tr\u00ed
8-Van tr\u00e0n 9-Xi lanh th\u1ee7y l\u1ef1c 10-B\u1ed9 l\u1ecdc h\u00fat
11-Van \u0111i\u1ec7n t\u1eeb hai chi\u1ec1u hai v\u1ecb tr\u00ed 12-Van \u0111i\u1ec1u khi\u1ec3n t\u1ed1c \u0111\u1ed9  
13- R\u01a1 le \u00e1p su\u1ea5t (1YJ)<\/figcaption><\/figure><\/div>\n\n\n\n

H\u00ecnh 1-10 m\u00f4 t\u1ea3 m\u1ed9t m\u1ea1ch t\u00e1c \u0111\u1ed9ng tu\u1ea7n t\u1ef1 v\u1edbi hai r\u01a1le \u00e1p su\u1ea5t. L\u1ed7i ch\u00ednh trong m\u1ea1ch n\u00e0y l\u00e0 h\u00e0nh \u0111\u1ed9ng tu\u1ea7n t\u1ef1 kh\u00f4ng ch\u00ednh x\u00e1c, t\u1ee9c l\u00e0 n\u00f3 kh\u00f4ng quay v\u00f2ng theo c\u00e1ch c\u1ee7a h\u00e0nh \u0111\u1ed9ng m\u1ed9t - h\u00e0nh \u0111\u1ed9ng hai - h\u00e0nh \u0111\u1ed9ng ba - h\u00e0nh \u0111\u1ed9ng b\u1ed1n. Nguy\u00ean nh\u00e2n c\u1ee7a k\u00edch ho\u1ea1t x\u1ea5u v\u00e0 c\u00e1c ph\u01b0\u01a1ng ph\u00e1p lo\u1ea1i b\u1ecf nh\u01b0 sau. \u00c1p su\u1ea5t \u0111i\u1ec1u ch\u1ec9nh c\u1ee7a t\u1eebng van kh\u00f4ng ph\u00f9 h\u1ee3p ho\u1eb7c thay \u0111\u1ed5i v\u00ec m\u1ed9t l\u00fd do n\u00e0o \u0111\u00f3 trong qu\u00e1 tr\u00ecnh s\u1eed d\u1ee5ng.<\/p>\n\n\n\n

V\u00ed d\u1ee5, \u0111\u1ec3 ng\u0103n r\u01a1le \u00e1p su\u1ea5t 1YJ g\u1eedi t\u00edn hi\u1ec7u sai tr\u01b0\u1edbc khi xi lanh k\u1eb9p 1 \u0111\u1ea1t \u0111\u1ebfn cu\u1ed1i h\u00e0nh tr\u00ecnh k\u1eb9p, \u00e1p su\u1ea5t \u0111i\u1ec1u ch\u1ec9nh 1YJ ph\u1ea3i l\u1edbn h\u01a1n \u00e1p su\u1ea5t k\u1eb9p c\u1ee7a xi lanh k\u1eb9p t\u1eeb 0,3 \u0111\u1ebfn 0,5 MPa v\u00e0 \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng xi lanh 2 kh\u00f4ng \u0111\u01b0\u1ee3c c\u1ea5p li\u1ec7u tr\u01b0\u1edbc tr\u01b0\u1edbc khi ph\u00f4i \u0111\u01b0\u1ee3c k\u1eb9p ch\u1eb7t, \u00e1p su\u1ea5t \u0111i\u1ec1u ch\u1ec9nh c\u1ee7a van gi\u1ea3m \u00e1p 5 cao h\u01a1n \u00e1p su\u1ea5t \u0111i\u1ec1u ch\u1ec9nh 1YJ t\u1eeb 0 \u0111\u1ebfn 0,5 MPa; \u00c1p su\u1ea5t \u0111i\u1ec1u ch\u1ec9nh c\u1ee7a van gi\u1ea3m 8 \u00c1p su\u1ea5t \u0111i\u1ec1u ch\u1ec9nh c\u1ee7a van gi\u1ea3m 8 ph\u1ea3i cao h\u01a1n 0,2 ~ 0,3MPa so v\u1edbi \u00e1p su\u1ea5t \u0111i\u1ec1u ch\u1ec9nh c\u1ee7a van 5 v\u00e0 0,3 ~ 0,4MPa l\u1edbn h\u01a1n \u00e1p su\u1ea5t l\u00e0m vi\u1ec7c t\u1ed1i \u0111a c\u1ee7a xi lanh 2. 2YJ n\u00ean s\u1eed d\u1ee5ng t\u1ed5n th\u1ea5t \u00e1p l\u1ef1c \u0111\u1ec3 g\u1eedi m\u1ed9t t\u00edn hi\u1ec7u.<\/p>\n\n\n\n

V\u1ea5n \u0111\u1ec1 4: C\u00e1c v\u1ea5n \u0111\u1ec1 v\u1ec1 \u0111i\u1ec1u khi\u1ec3n tr\u00ecnh t\u1ef1 v\u00e0 t\u1ed1c \u0111\u1ed9 \u0111\u1ed3ng th\u1eddi<\/strong><\/h3>\n\n\n\n

1. V\u1ea5n \u0111\u1ec1 v\u1ec1 ph\u01b0\u01a1ng ph\u00e1p \u0111i\u1ec1u khi\u1ec3n c\u1ee7a van tu\u1ea7n t\u1ef1<\/strong><\/strong><\/p>\n\n\n\n

\u0110\u1ed1i v\u1edbi c\u00e1c m\u1ea1ch c\u00f3 t\u1ed1c \u0111\u1ed9 v\u00e0 \u0111i\u1ec1u khi\u1ec3n tu\u1ea7n t\u1ef1 \u0111\u1ed3ng th\u1eddi, ph\u01b0\u01a1ng ph\u00e1p \u0111i\u1ec1u khi\u1ec3n c\u1ee7a van tu\u1ea7n t\u1ef1 c\u1ea7n \u0111\u01b0\u1ee3c xem x\u00e9t c\u1ea9n th\u1eadn.<\/p>\n\n\n\n

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1-11 L\u1ef1a ch\u1ecdn ph\u01b0\u01a1ng ph\u00e1p \u0111i\u1ec1u khi\u1ec3n c\u1ee7a van tu\u1ea7n t\u1ef1
1-Xi lanh k\u1eb9p 2-Xi lanh c\u1ea5p li\u1ec7u 3-Van tu\u1ea7n t\u1ef1 4-Van \u00e1p su\u1ea5t 5-Ph\u00f4i<\/figcaption><\/figure><\/div>\n\n\n\n

L\u1ea5y m\u1ea1ch \u0111i\u1ec7n tr\u00ean h\u00ecnh 1-11 l\u00e0m v\u00ed d\u1ee5, y\u00eau c\u1ea7u thi\u1ebft k\u1ebf: xi lanh k\u1eb9p 1 k\u1eb9p ph\u00f4i 5 tr\u01b0\u1edbc khi xi lanh c\u1ea5p 2 t\u00e1c \u0111\u1ed9ng v\u00e0. T\u1ed1c \u0111\u1ed9 c\u1ee7a xi lanh k\u1eb9p 1 \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u ph\u1ea3i \u0111i\u1ec1u ch\u1ec9nh \u0111\u01b0\u1ee3c. H\u00ecnh 1-11 (a) \u0110\u1ec3 \u0111i\u1ec1u khi\u1ec3n t\u1ed1c \u0111\u1ed9 c\u1ee7a xi lanh k\u1eb9p 1 qua van ti\u1ebft l\u01b0u, van \u0111i\u1ec1u \u00e1p 4 ph\u1ea3i l\u00e0 van gi\u1ea3m \u00e1p (van \u00e1p su\u1ea5t th\u01b0\u1eddng m\u1edf) v\u00e0 m\u1ea1ch ph\u1ea3i l\u00e0 m\u1ea1ch \u00e1p su\u1ea5t kh\u00f4ng \u0111\u1ed5i, \u00e1p su\u1ea5t c\u1ee7a \u0111\u01b0\u1ee3c \u0111i\u1ec1u ch\u1ec9nh b\u1edfi van \u00e1p su\u1ea5t 4. Nh\u01b0 v\u1eady, \u00e1p su\u1ea5t m\u1edf p c\u1ee7a van th\u1ee9 t\u1ef1 3 ch\u1ec9 c\u00f3 th\u1ec3 l\u00e0 p2 \u2264 pi n\u00ean xi lanh c\u1ea5p li\u1ec7u 2 ch\u1ec9 c\u00f3 th\u1ec3 t\u00e1c \u0111\u1ed9ng tr\u01b0\u1edbc ho\u1eb7c c\u00f9ng v\u1edbi xi lanh k\u1eb9p 1 (m\u00e0 kh\u00f4ng x\u00e9t \u0111\u1ebfn s\u1ef1 ch\u00eanh l\u1ec7ch t\u1ea3i gi\u1eefa hai xi lanh), kh\u00f4ng \u0111\u1ea1t \u0111\u01b0\u1ee3c m\u1ee5c \u0111\u00edch \u0111\u00e3 \u0111\u1ecbnh. Van tu\u1ea7n t\u1ef1 trong H\u00ecnh 1-11 (b) \u0111\u01b0\u1ee3c \u0111i\u1ec1u khi\u1ec3n theo c\u00e1ch b\u00ean ngo\u00e0i, t\u1ee9c l\u00e0 \u00e1p su\u1ea5t th\u1ee9 c\u1ea5p (\u0111i\u1ec1u khi\u1ec3n) kh\u00f4ng \u0111\u01b0\u1ee3c d\u1eabn b\u1edfi \u00e1p su\u1ea5t s\u01a1 c\u1ea5p, m\u00e0 \u0111\u01b0\u1ee3c d\u1eabn b\u1edfi c\u1eeda ra c\u1ee7a van ti\u1ebft l\u01b0u. Theo c\u00e1ch n\u00e0y khi xylanh k\u1eb9p 1 trong qu\u00e1 tr\u00ecnh chuy\u1ec3n \u0111\u1ed9ng, do van ti\u1ebft l\u01b0u ph\u1ea3i t\u1ed3n t\u1ea1i ch\u00eanh l\u1ec7ch \u00e1p su\u1ea5t n\u00ean \u00e1p su\u1ea5t th\u1ee9 c\u1ea5p lu\u00f4n nh\u1ecf h\u01a1n \u00e1p su\u1ea5t s\u01a1 c\u1ea5p, \u0111\u1ebfn khi xylanh k\u1eb9p 1 d\u1eebng chuy\u1ec3n \u0111\u1ed9ng th\u00ec \u00e1p su\u1ea5t th\u1ee9 c\u1ea5p b\u1eb1ng \u0111\u1ebfn - - \u00e1p su\u1ea5t th\u1ee9 c\u1ea5p, xi lanh c\u1ea5p li\u1ec7u 2 ch\u1ec9 \u0111\u1ec3 b\u1eaft \u0111\u1ea7u t\u00e1c \u0111\u1ed9ng, \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c t\u00e1c \u0111\u1ed9ng tu\u1ea7n t\u1ef1 c\u1ea7n thi\u1ebft.<\/p>\n\n\n\n

2.<\/strong> C\u00e1c th\u00f4ng s\u1ed1 \u0111i\u1ec1u ch\u1ec9nh kh\u00f4ng \u0111\u00fang c\u1ee7a van x\u1ea3 v\u00e0 van tu\u1ea7n t\u1ef1 d\u1eabn \u0111\u1ebfn ho\u1ea1t \u0111\u1ed9ng tr\u00ecnh t\u1ef1 kh\u00f4ng \u0111\u00e1p \u1ee9ng \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u<\/strong><\/p>\n\n\n\n

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H\u1ec7 th\u1ed1ng th\u1ee7y l\u1ef1c t\u00e1c \u0111\u1ed9ng tu\u1ea7n t\u1ef1 1-12 xi lanh \u0111\u00f4i cho m\u00e1y c\u00f4ng c\u1ee5 chuy\u00ean d\u1ee5ng
1-B\u01a1m th\u1ee7y l\u1ef1c 2-Van \u00e1p su\u1ea5t 3 van gi\u1ea3m 4,5-Xi lanh th\u1ee7y l\u1ef1c<\/figcaption><\/figure><\/div>\n\n\n\n

Nh\u01b0 th\u1ec3 hi\u1ec7n trong H\u00ecnh 1-12 \u0111\u1ed1i v\u1edbi h\u1ec7 th\u1ed1ng th\u1ee7y l\u1ef1c t\u00e1c \u0111\u1ed9ng tu\u1ea7n t\u1ef1 hai xi lanh c\u1ee7a m\u00e1y c\u00f4ng c\u1ee5 \u0111\u1eb7c bi\u1ec7t. Do c\u00e1c th\u00f4ng s\u1ed1 \u0111i\u1ec1u ch\u1ec9nh c\u1ee7a van x\u1ea3 v\u00e0 van tu\u1ea7n t\u1ef1 kh\u00f4ng ph\u00f9 h\u1ee3p, d\u1eabn \u0111\u1ebfn t\u1ed1c \u0111\u1ed9 chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a xi lanh th\u1ee7y l\u1ef1c 4 c\u00f3 th\u1ec3 \u0111\u1ea1t gi\u00e1 tr\u1ecb thi\u1ebft k\u1ebf, trong khi t\u1ed1c \u0111\u1ed9 c\u1ee7a xi lanh th\u1ee7y l\u1ef1c 5 th\u00ec x\u00e1c \u0111\u1ecbnh tr\u01b0\u1edbc th\u1ea5p. Nguy\u00ean nh\u00e2n c\u1ee7a s\u1ef1 c\u1ed1 tr\u00ean: do van \u0111i\u1ec1u \u00e1p 2 kh\u00f4ng m\u1edf \u0111\u01b0\u1ee3c khi m\u1edf, d\u00f2ng ch\u1ea3y c\u1ee7a b\u01a1m s\u1ebd b\u1ecb chuy\u1ec3n h\u01b0\u1edbng, t\u1ee9c l\u00e0 van x\u1ea3 \u00e1p 3 \u0111\u1eb7t gi\u00e1 tr\u1ecb \u00e1p su\u1ea5t m\u1edf th\u1ea5p h\u01a1n van th\u1ee9 t\u1ef1 qua b\u01a1m th\u1ee7y l\u1ef1c. Khi l\u01b0u l\u01b0\u1ee3ng \u0111\u1ea7y \u0111\u1ee7 c\u1ee7a gi\u00e1 tr\u1ecb \u00e1p su\u1ea5t cao nh\u1ea5t ho\u1eb7c van gi\u1ea3m \u00e1p 3 \u0111\u01b0\u1ee3c \u0111\u1eb7t \u0111\u1ec3 m\u1edf gi\u00e1 tr\u1ecb \u00e1p su\u1ea5t b\u1eb1ng ho\u1eb7c cao h\u01a1n m\u1ed9t ch\u00fat so v\u1edbi van th\u1ee9 t\u1ef1 m\u1edf qua b\u01a1m th\u1ee7y l\u1ef1c khi l\u01b0u l\u01b0\u1ee3ng \u0111\u1ea7y \u0111\u1ee7 c\u1ee7a gi\u00e1 tr\u1ecb \u00e1p su\u1ea5t cao nh\u1ea5t th\u00ec xi lanh th\u1ee7y l\u1ef1c kh\u00f4ng th\u1ec3 ch\u1ea1y Do \u0111\u00f3, \u1edf t\u1ed1c \u0111\u1ed9 t\u1ed1i \u0111a ho\u1eb7c t\u1ed1c \u0111\u1ed9 khi l\u1edbn v\u00e0 \u0111\u00f4i khi nh\u1ecf, Do \u0111\u00f3, \u0111\u1ec3 \u0111\u1eb7t \u00e1p su\u1ea5t c\u1ee7a van gi\u1ea3m \u00e1p 3 cao h\u01a1n 0,5 ~ 0,8MPa so v\u1edbi \u00e1p su\u1ea5t cao nh\u1ea5t sau khi van th\u1ee9 t\u1ef1 \u0111\u01b0\u1ee3c m\u1edf, v\u1ea5n \u0111\u1ec1 c\u1ee7a h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c gi\u1ea3i quy\u1ebft.<\/p>\n\n\n\n

B\u00e0i to\u00e1n 5: B\u00e0i to\u00e1n thi\u1ebft k\u1ebf m\u1ea1ch t\u1ea3i bi\u1ebfn thi\u00ean<\/strong><\/strong><\/h3>\n\n\n\n
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1-13 H\u1ec7 th\u1ed1ng thi\u1ebft k\u1ebf c\u1ee7a m\u1ea1ch t\u1ea3i bi\u1ebfn \u0111\u1ed5i
1-B\u01a1m \u0111\u1ecbnh l\u01b0\u1ee3ng 2-Van l\u01b0u l\u01b0\u1ee3ng ph\u00e2n bi\u1ec7t  
3-Van h\u01b0\u1edbng \u0111i\u1ec7n t\u1eeb 4,5-Van \u0111i\u1ec1u khi\u1ec3n t\u1eeb xa  
6,7- Van m\u1ed9t chi\u1ec1u 8 Xi lanh th\u1ee7y l\u1ef1c<\/figcaption><\/figure><\/div>\n\n\n\n

Trong h\u1ec7 th\u1ed1ng th\u1ec3 hi\u1ec7n tr\u00ean h\u00ecnh 1-13, b\u01a1m th\u1ee7y l\u1ef1c 1 l\u00e0 b\u01a1m \u0111\u1ecbnh l\u01b0\u1ee3ng v\u00e0 van \u0111\u1ea3o chi\u1ec1u \u0111i\u1ec7n th\u1ee7y l\u1ef1c ba chi\u1ec1u b\u1ed1n chi\u1ec1u l\u00e0 lo\u1ea1i Y.<\/p>\n\n\n\n

Xi lanh th\u1ee7y l\u1ef1c 8 \u0111\u1ea9y t\u1ea3i tr\u1ecdng W chuy\u1ec3n \u0111\u1ed9ng. Khi t\u1ea3i l\u00e0 d\u01b0\u01a1ng \u1edf n\u1eeda \u0111\u1ea7u c\u1ee7a v\u1ecb tr\u00ed trung h\u00f2a v\u00e0 \u00e2m \u1edf n\u1eeda sau c\u1ee7a v\u1ecb tr\u00ed trung h\u00f2a, t\u1ee9c l\u00e0 h\u01b0\u1edbng c\u1ee7a t\u1ea3i gi\u1ed1ng v\u1edbi h\u01b0\u1edbng chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a xi lanh th\u1ee7y l\u1ef1c, c\u00e1c van th\u1ee9 t\u1ef1 4 v\u00e0 5 l\u00e0 van tr\u00ecnh t\u1ef1 \u0111i\u1ec1u khi\u1ec3n t\u1eeb xa. Khi xi lanh th\u1ee7y l\u1ef1c \u0111ang \u0111\u1ea9y chuy\u1ec3n \u0111\u1ed9ng t\u1ea3i sang ph\u1ea3i, bu\u1ed3ng kh\u00f4ng thanh truy\u1ec1n xi lanh th\u1ee7y l\u1ef1c v\u00e0o \u00e1p su\u1ea5t d\u1ea7u c\u1ee7a m\u1ea1ch d\u1ea7u \u0111\u1ee7 l\u1edbn \u0111\u1ec3 m\u1edf van tr\u00ecnh t\u1ef1 \u0111i\u1ec1u khi\u1ec3n t\u1eeb xa 4, xi lanh th\u1ee7y l\u1ef1c c\u00f3 th\u1ec3 \u0111\u1ea9y chuy\u1ec3n \u0111\u1ed9ng t\u1ea3i sang ph\u1ea3i. Ng\u01b0\u1ee3c l\u1ea1i, khi xi lanh th\u1ee7y l\u1ef1c \u0111ang k\u00e9o t\u1ea3i sang tr\u00e1i, th\u00ec xi lanh th\u1ee7y l\u1ef1c ch\u1ec9 c\u00f3 th\u1ec3 k\u00e9o t\u1ea3i sang tr\u00e1i khi \u00e1p su\u1ea5t th\u1ee7y l\u1ef1c trong m\u1ea1ch \u0111\u1ea7u v\u00e0o bu\u1ed3ng kh\u00f4ng thanh c\u1ee7a xi lanh th\u1ee7y l\u1ef1c \u0111\u1ea1t \u0111\u1ebfn \u00e1p su\u1ea5t c\u00f3 th\u1ec3 m\u1edf van tu\u1ea7n t\u1ef1 \u0111i\u1ec1u khi\u1ec3n t\u1eeb xa 5.<\/p>\n\n\n\n

\"\"<\/figure><\/div>\n\n\n\n

V\u1ea5n \u0111\u1ec1 v\u1edbi h\u1ec7 th\u1ed1ng l\u00e0 xi lanh th\u1ee7y l\u1ef1c t\u1ea1o ra rung \u0111\u1ed9ng v\u00e0 ch\u1ea5n \u0111\u1ed9ng m\u1ea1nh trong qu\u00e1 tr\u00ecnh chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a t\u1ea3i. Van tr\u00ecnh t\u1ef1 \u0111i\u1ec1u khi\u1ec3n t\u1eeb xa \u0111\u01b0\u1ee3c \u0111\u1eb7t trong h\u1ec7 th\u1ed1ng \u0111\u1ec3 tr\u00e1nh s\u1ef1 c\u1ed1 xylanh th\u1ee7y l\u1ef1c b\u1ecb tr\u01b0\u1ee3t m\u1ea1nh xu\u1ed1ng d\u01b0\u1edbi khi h\u01b0\u1edbng t\u1ea3i b\u1ecb thay \u0111\u1ed5i trong chuy\u1ec3n \u0111\u1ed9ng \u0111\u1ea9y c\u1ee7a t\u1ea3i. Nguy\u00ean nh\u00e2n g\u00e2y ra hi\u1ec7n t\u01b0\u1ee3ng rung v\u00e0 va \u0111\u1eadp c\u1ee7a xi lanh th\u1ee7y l\u1ef1c l\u00e0 do khi t\u1ea3i tr\u1ecdng truy\u1ec1n xu\u1ed1ng b\u00ean ph\u1ea3i qua v\u1ecb tr\u00ed trung h\u00f2a, \u00e1p su\u1ea5t trong bu\u1ed3ng kh\u00f4ng thanh c\u1ee7a xi lanh th\u1ee7y l\u1ef1c gi\u1ea3m nhanh ch\u00f3ng, d\u1eabn \u0111\u1ebfn \u00e1p su\u1ea5t \u0111\u1ea7u v\u00e0o kh\u00f4ng th\u1ec3 m\u1edf \u0111\u01b0\u1ee3c. van tu\u1ea7n t\u1ef1 \u0111i\u1ec1u khi\u1ec3n t\u1eeb xa 4, do \u0111\u00f3 van tr\u00ecnh t\u1ef1 \u0111i\u1ec1u khi\u1ec3n t\u1eeb xa 4 \u0111\u00f3ng l\u1ea1i ngay l\u1eadp t\u1ee9c, l\u00fac n\u00e0y khi xi lanh th\u1ee7y l\u1ef1c chuy\u1ec3n \u0111\u1ed9ng nhanh sang ph\u1ea3i d\u01b0\u1edbi l\u1ef1c k\u00e9o c\u1ee7a t\u1ea3i, d\u1ea7u trong khoang kh\u00f4ng thanh truy\u1ec1n nhanh ch\u00f3ng \u0111\u01b0\u1ee3c x\u1ea3 ra b\u00ean ngo\u00e0i, do \u0111\u00f3 khi van tr\u00ecnh t\u1ef1 \u0111i\u1ec1u khi\u1ec3n t\u1eeb xa \u0111\u00f3ng l\u1ea1i, n\u00f3 t\u1ea1o ra rung \u0111\u1ed9ng v\u00e0 ch\u1ea5n \u0111\u1ed9ng d\u1eef d\u1ed9i, do \u0111\u00f3 t\u1ea3i tr\u1ecdng \u0111ang chuy\u1ec3n \u0111\u1ed9ng sang ph\u1ea3i bu\u1ed9c ph\u1ea3i d\u1eebng chuy\u1ec3n \u0111\u1ed9ng.<\/p>\n\n\n\n

Khi van \u0111i\u1ec1u khi\u1ec3n t\u1eeb xa \u0111\u00f3ng l\u1ea1i, xi lanh th\u1ee7y l\u1ef1c kh\u00f4ng th\u1ec3 quay tr\u1edf l\u1ea1i b\u00ecnh ch\u1ee9a, do \u0111\u00f3 \u00e1p su\u1ea5t trong bu\u1ed3ng kh\u00f4ng thanh c\u1ee7a xi lanh th\u1ee7y l\u1ef1c t\u0103ng nhanh, g\u00e2y rung v\u00e0 gi\u1eadt. Khi bu\u1ed3ng kh\u00f4ng que c\u1ee7a xi lanh th\u1ee7y l\u1ef1c \u00e1p su\u1ea5t ch\u1ea5t l\u1ecfng t\u0103ng l\u00ean \u0111\u1ec3 \u00e1p su\u1ea5t \u0111\u1ea7u v\u00e0o c\u1ee7a n\u00f3 c\u00f3 th\u1ec3 m\u1edf van tr\u00ecnh t\u1ef1 \u0111i\u1ec1u khi\u1ec3n t\u1eeb xa 4, bu\u1ed3ng kh\u00f4ng que c\u1ee7a xi lanh th\u1ee7y l\u1ef1c c\u1ee7a ch\u1ea5t l\u1ecfng \u0111i th\u1eb3ng qua th\u00f9ng, t\u1ea3i v\u00e0 xoay m\u1ea1nh xu\u1ed1ng b\u00ean ph\u1ea3i. Qu\u00e1 tr\u00ecnh n\u00e0y l\u1eb7p l\u1ea1i ch\u00ednh n\u00f3, do \u0111\u00f3 rung \u0111\u1ed9ng v\u00e0 s\u1ed1c \u0111\u01b0\u1ee3c t\u1ea1o ra. Khi xi lanh th\u1ee7y l\u1ef1c k\u00e9o t\u1ea3i tr\u1ecdng l\u1eafc sang tr\u00e1i, hi\u1ec7n t\u01b0\u1ee3ng rung v\u00e0 gi\u1eadt t\u01b0\u01a1ng t\u1ef1 c\u0169ng x\u1ea3y ra khi t\u1ea3i tr\u1ecdng tr\u01b0\u1ee3t xu\u1ed1ng tr\u00e1i v\u01b0\u1ee3t qu\u00e1 v\u1ecb tr\u00ed trung h\u00f2a.<\/p>\n\n\n\n

L\u1ed7i n\u00e0y l\u00e0 do thi\u1ebft k\u1ebf k\u00e9m v\u00e0 do \u0111\u00f3 c\u1ea7n \u0111\u01b0\u1ee3c c\u1ea3i thi\u1ec7n theo H\u00ecnh 1-13 b. \u0110\u1eb7t van ti\u1ebft l\u01b0u tr\u00ean \u0111\u01b0\u1eddng ra c\u1ee7a van th\u1ee9 t\u1ef1 \u0111i\u1ec1u khi\u1ec3n t\u1eeb xa 4 v\u00e0 5 t\u01b0\u01a1ng \u1ee9ng \u0111\u1ec3 \u0111i\u1ec1u ch\u1ec9nh t\u1ed1c \u0111\u1ed9 chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a xi lanh th\u1ee7y l\u1ef1c. Khi ph\u1ee5 t\u1ea3i v\u01b0\u1ee3t qua v\u1ecb tr\u00ed trung h\u00f2a, t\u1ee9c l\u00e0 h\u01b0\u1edbng t\u1ea3i v\u00e0 h\u01b0\u1edbng chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a xi lanh th\u1ee7y l\u1ef1c - nh\u01b0 nhau, d\u1ea7u trong bu\u1ed3ng h\u1ed3i l\u01b0u xi lanh th\u1ee7y l\u1ef1c kh\u00f4ng th\u1ec3 quay tr\u1edf l\u1ea1i th\u00f9ng m\u1ed9t c\u00e1ch v\u00f4 h\u1ea1n m\u00e0 do van ti\u1ebft l\u01b0u \u0111i\u1ec1u ti\u1ebft. Khi \u0111i\u1ec1u ch\u1ec9nh c\u1ed5ng ti\u1ebft l\u01b0u van ti\u1ebft l\u01b0u, th\u00f4ng qua van ti\u1ebft l\u01b0u l\u01b0u l\u01b0\u1ee3ng Q theo c\u00f4ng th\u1ee9c sau \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh.<\/p>\n\n\n\n

\"\"<\/figure><\/div>\n\n\n\n

Q - T\u1ed1c \u0111\u1ed9 d\u00f2ng ch\u1ea3y qua van ti\u1ebft l\u01b0u, cm\u00b3 \/ s<\/p>\n\n\n\n

NSNS <\/sub>- H\u1ec7 s\u1ed1 l\u01b0u l\u01b0\u1ee3ng, cm 0.5<\/sup><\/p>\n\n\n\n

A - Di\u1ec7n t\u00edch m\u1eb7t c\u1eaft ngang c\u1ee7a l\u1ed7 van ti\u1ebft l\u01b0u, cm\u00b2<\/p>\n\n\n\n

\u03c1- Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a d\u1ea7u, kg \/ cm\u00b3<\/p>\n\n\n\n

P - ch\u00eanh l\u1ec7ch \u00e1p su\u1ea5t gi\u1eefa ph\u00eda tr\u01b0\u1edbc v\u00e0 ph\u00eda sau b\u01b0\u1edbm ga, N \/ cm\u00b2<\/p>\n\n\n\n

T\u1eeb c\u00f4ng th\u1ee9c tr\u00ean c\u00f3 th\u1ec3 th\u1ea5y, khi \u0111\u1eb7t A, qua van ti\u1ebft l\u01b0u l\u01b0u l\u01b0\u1ee3ng Q v\u00e0 van ti\u1ebft l\u01b0u tr\u01b0\u1edbc v\u00e0 sau c\u0103n b\u1eadc hai c\u1ee7a \u0111\u1ed9 ch\u00eanh l\u1ec7ch \u00e1p su\u1ea5t \u0394p t\u1ec9 l\u1ec7 v\u1edbi \u00e1p su\u1ea5t sau van ti\u1ebft l\u01b0u b\u1eb1ng kh\u00f4ng (v\u00ec tr\u1ef1c ti\u1ebfp qua b\u00ecnh) , do \u0111\u00f3 l\u01b0u l\u01b0\u1ee3ng qua van ti\u1ebft l\u01b0u c\u00e0ng l\u1edbn th\u00ec \u00e1p su\u1ea5t c\u1ee7a xi lanh th\u1ee7y l\u1ef1c tr\u1edf l\u1ea1i bu\u1ed3ng d\u1ea7u c\u00e0ng l\u1edbn. Theo c\u00e1ch n\u00e0y, khi h\u01b0\u1edbng c\u1ee7a t\u1ea3i gi\u1ed1ng v\u1edbi h\u01b0\u1edbng chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a xi lanh th\u1ee7y l\u1ef1c, d\u1ea7u trong khoang h\u1ed3i l\u01b0u c\u1ee7a xi lanh th\u1ee7y l\u1ef1c ch\u1ecbu \u00e1p su\u1ea5t nh\u1ea5t \u0111\u1ecbnh v\u00e0 \u00e1p su\u1ea5t n\u00e0y thay \u0111\u1ed5i khi \u0111i\u1ec1u ch\u1ec9nh van ti\u1ebft l\u01b0u. Do \u0111\u00f3, \u00e1p su\u1ea5t trong khoang \u0111\u1ea7u v\u00e0o c\u1ee7a xi lanh th\u1ee7y l\u1ef1c s\u1ebd kh\u00f4ng gi\u1ea3m nhanh ch\u00f3ng trong \u0111i\u1ec1u ki\u1ec7n t\u1ea3i \u00e2m v\u00e0 van tu\u1ea7n t\u1ef1 \u0111i\u1ec1u khi\u1ec3n t\u1eeb xa s\u1ebd kh\u00f4ng \u0111\u00f3ng. Do \u0111\u00f3, trong qu\u00e1 tr\u00ecnh t\u1ea3i tr\u1ecdng thay \u0111\u1ed5i t\u1eeb d\u01b0\u01a1ng sang \u00e2m, xi lanh th\u1ee7y l\u1ef1c v\u1eabn chuy\u1ec3n \u0111\u1ed9ng tr\u01a1n tru do s\u1ef1 \u0111i\u1ec1u ti\u1ebft c\u1ee7a van ti\u1ebft l\u01b0u. L\u00fac n\u00e0y van tu\u1ea7n t\u1ef1 \u0111i\u1ec1u khi\u1ec3n t\u1eeb xa ch\u1ee7 y\u1ebfu \u0111\u00f3ng vai tr\u00f2 c\u00e2n b\u1eb1ng gi\u00fap t\u1ea3i c\u00f3 th\u1ec3 \u1edf v\u1ecb tr\u00ed n\u00e0o \u0111\u1ec3 lu\u00f4n \u1ed5n \u0111\u1ecbnh. \u0110\u1ec3 \u0111\u1ea3m b\u1ea3o h\u1ec7 th\u1ed1ng th\u1ee7y l\u1ef1c. C\u00f3 th\u1ec3 s\u1eed d\u1ee5ng s\u01a1 \u0111\u1ed3 h\u1ec7 th\u1ed1ng m\u1ea1ch th\u1ee7y l\u1ef1c \u0111\u1ed1i v\u1edbi t\u1ea3i thay \u0111\u1ed5i trong H\u00ecnh 1-14 \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00ednh th\u00f4ng su\u1ed1t v\u00e0 \u0111\u1ed9 tin c\u1eady c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n\n\n\n

\"\"
1-14 S\u01a1 \u0111\u1ed3 h\u1ec7 th\u1ed1ng c\u1ee7a m\u1ea1ch th\u1ee7y l\u1ef1c t\u1ea3i bi\u1ebfn thi\u00ean<\/figcaption><\/figure><\/div>\n\n\n\n

N\u1ebfu thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng kh\u00f4ng \u0111\u01b0\u1ee3c suy ngh\u0129 k\u1ef9 l\u01b0\u1ee1ng, m\u1ed9t l\u1ed7i n\u00e0y ho\u1eb7c m\u1ed9t l\u1ed7i kh\u00e1c ch\u1eafc ch\u1eafn s\u1ebd x\u1ea3y ra, th\u1eadm ch\u00ed n\u1ebfu to\u00e0n b\u1ed9 h\u1ec7 th\u1ed1ng th\u1ee7y l\u1ef1c kh\u00f4ng th\u1ec3 ho\u1ea1t \u0111\u1ed9ng. Do \u0111\u00f3, \u0111\u1ed1i v\u1edbi c\u00e1c h\u1ec7 th\u1ed1ng ch\u1ecbu t\u1ea3i tr\u1ecdng xoay chi\u1ec1u, c\u1ea7n ph\u00e2n t\u00edch k\u1ef9 c\u00e1c l\u1ef1c tr\u01b0\u1edbc khi thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng th\u1ee7y l\u1ef1c.<\/p>","protected":false},"excerpt":{"rendered":"

N\u1ebfu thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng kh\u00f4ng \u0111\u01b0\u1ee3c suy ngh\u0129 k\u1ef9 l\u01b0\u1ee1ng, l\u1ed7i n\u00e0y ho\u1eb7c h\u1ecfng h\u00f3c kh\u00e1c ch\u1eafc ch\u1eafn s\u1ebd x\u1ea3y ra, th\u1eadm ch\u00ed c\u1ea3 h\u1ec7 th\u1ed1ng th\u1ee7y l\u1ef1c kh\u00f4ng th\u1ec3 ho\u1ea1t \u0111\u1ed9ng. <\/p>","protected":false},"author":1,"featured_media":2308,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[1],"tags":[709,708],"class_list":["post-2280","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hydraulic-press","tag-hydraulic-sequence-valve-circuit","tag-sequence-valve"],"jetpack_featured_media_url":"https:\/\/www.avido.cn\/wp-content\/uploads\/2021\/04\/Hydraulic-Press.jpg","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.avido.cn\/vi\/wp-json\/wp\/v2\/posts\/2280","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.avido.cn\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.avido.cn\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.avido.cn\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.avido.cn\/vi\/wp-json\/wp\/v2\/comments?post=2280"}],"version-history":[{"count":0,"href":"https:\/\/www.avido.cn\/vi\/wp-json\/wp\/v2\/posts\/2280\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.avido.cn\/vi\/wp-json\/wp\/v2\/media\/2308"}],"wp:attachment":[{"href":"https:\/\/www.avido.cn\/vi\/wp-json\/wp\/v2\/media?parent=2280"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.avido.cn\/vi\/wp-json\/wp\/v2\/categories?post=2280"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.avido.cn\/vi\/wp-json\/wp\/v2\/tags?post=2280"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}