阅读说明：本技术 一种辅助阀组 (Auxiliary valve group ) 是由 朱剑根 金丹 马欲宏 谷文平 于 2020-12-31 设计创作，主要内容包括：本发明涉及一种辅助阀组,其包括阀块、插装式溢流组件、换向组件；阀体包括第一油口、进油道、溢流进油孔、溢流出油孔、换向进油孔、出流道、回流道、第四油口、工艺孔、螺塞孔、回油孔、出油孔、第二油口、第三油口；插装式溢流组件包括阀座、内凸台、第一阀芯、组合密封垫、进油斜孔、卡圈、溢流孔、弹簧座、第一弹簧、阀套、导套、调节杆、调节套、锁紧螺母、钢丝挡圈和第一挡圈；换向组件包括阀体、后盖、螺套、后销轴、第二挡圈、塔形弹簧、钢丝挡圈、第二阀芯、多个流道、前销轴、紧定螺钉、前盖、滑杆、螺销、格莱圈、钢球、第二弹簧、螺盖、铜套、手柄杆、多个换向孔和转轴。本申请具有操控方便,结构紧凑,体积小,不受环境腐蚀影响。(The invention relates to an auxiliary valve group, which comprises a valve block, a plug-in overflow assembly and a reversing assembly, wherein the valve block is provided with a valve seat; the valve body comprises a first oil port, an oil inlet channel, an overflow oil inlet hole, an overflow oil outlet hole, a reversing oil inlet hole, an outlet channel, a return channel, a fourth oil port, a fabrication hole, a plug screw hole, an oil return hole, an oil outlet hole, a second oil port and a third oil port; the plug-in type overflow assembly comprises a valve seat, an inner boss, a first valve core, a combined sealing gasket, an oil inlet inclined hole, a clamping ring, an overflow hole, a spring seat, a first spring, a valve sleeve, a guide sleeve, an adjusting rod, an adjusting sleeve, a locking nut, a steel wire retaining ring and a first retaining ring; the reversing assembly comprises a valve body, a rear cover, a threaded sleeve, a rear pin shaft, a second check ring, a tower-shaped spring, a steel wire check ring, a second valve core, a plurality of flow channels, a front pin shaft, a set screw, a front cover, a slide bar, a screw pin, a GRILL ring, a steel ball, a second spring, a threaded cover, a copper sleeve, a handle rod, a plurality of reversing holes and a rotating shaft. The application has the advantages of convenient operation, compact structure, small volume and no influence of environmental corrosion.)

1. An auxiliary valve block, comprising: comprises a valve block (100), a plug-in overflow component (200) and a reversing component (300);

the valve body (301) comprises a first oil port (101), an oil inlet channel (102), an overflow oil inlet hole (103), an overflow oil outlet hole (104), a reversing oil inlet hole (105), a first oil outlet channel (106), a second oil outlet channel (107), a return channel (108), a fourth oil port (109), a process hole (110), an oil return hole (112), a first oil outlet hole (113), a second oil outlet hole (114), a second oil port (115) and a third oil port (116); the first oil port (101) is connected with an external oil inlet pipeline, the inside of the first oil port is communicated with an overflow oil inlet hole (103) through an oil inlet channel (102), and the plug-in type overflow assembly (200) is installed in a plug-in hole communicated with the overflow oil inlet hole (103) and an overflow oil outlet hole (104); one end of the reversing oil inlet hole (105) is communicated with the overflow oil inlet hole (103), and the other end of the reversing oil inlet hole is communicated with the top surface of the valve block (100) and communicated with the reversing assembly (300); one end of the first flow outlet channel (106) is communicated with the second oil port (115) through the first oil outlet hole (113), and the other end of the first flow outlet channel is communicated with the reversing assembly (300); one end of the second flow outlet channel (107) is communicated with the third oil port (116) through the second oil outlet hole (114), and the other end of the second flow outlet channel is communicated with the reversing assembly (300); one end of the return channel (108) is communicated with the process hole (110), the inclined hole to the fourth oil port (109), and the other end of the return channel is communicated with the reversing assembly (300); the process hole (110) penetrates through the overflow oil outlet hole (104);

the reversing assembly (300) comprises a valve body (301), a rear cover (303), a threaded sleeve (304), a rear pin shaft (305), a tower-shaped spring (308), a second valve core (311), a first flow channel (312), a second flow channel (313), a third flow channel (314), a fourth flow channel (315), a fifth flow channel (316), a front pin shaft (317), a front cover (320), a sliding rod (321), a threaded cover (328), a handle rod (330), a first reversing hole (331), a second reversing hole (332), a third reversing hole (333), a fourth reversing hole (334), a fifth reversing hole (335) and a rotating shaft (340);

the second valve core (311) is installed in a main through hole of the valve body (301), the first flow passage (312), the second flow passage (313), the third flow passage (314), the fourth flow passage (315) and the fifth flow passage (316) are located in the main through hole, and the first flow passage (312), the second flow passage (313), the third flow passage (314), the fourth flow passage (315) and the fifth flow passage (316) are respectively communicated with the first reversing hole (331), the second reversing hole (332), the third reversing hole (333), the fourth reversing hole (334) and the fifth reversing hole (335) correspondingly; two ends of the valve body (301) are respectively matched with the rear cover (303) and the front cover (320), and the front end and the rear end of the main hole are respectively provided with a threaded sleeve (304), a rear pin shaft (305), a front pin shaft (317) and a tower-shaped spring (308); a sliding rod (321) is arranged in the front cover (320), and one end of a front pin shaft (317) is fixedly arranged in the sliding rod (321); the rotating shaft (340) is arranged on the front cover (320), the handle rod (330) is arranged on the rotating shaft, and the screw cap (328) is arranged on the front cover (320).

2. An auxiliary valve block as claimed in claim 1, wherein: the plug-in type overflow assembly (200) comprises a valve seat (201), an inner boss (202), a first valve core (203), an oil inlet inclined hole (205), an overflow hole (207), a spring seat (209), a first spring (210), a valve sleeve (211), a guide sleeve (212) and an adjusting piece; a first valve core (203) is arranged in the valve seat (201), the inner boss (202) protrudes out of the inner wall of the valve seat (201) and is used for limiting the stroke of the first valve core (203), the opening and closing of overflow are controlled at the position where the end surface of an inner hole of the valve seat (201) is matched with the conical surface of the first valve core (203), and a gap is reserved between the inner hole of the valve seat (201) and the cylindrical matching surface of the first valve core (203); the combined sealing gasket (204) separates a high-pressure overflow area from a low-pressure oil return area; the oil inlet inclined holes (205) are uniformly distributed at the junction of the end surface of the large excircle and the small excircle of the valve seat (201) and are channels for hydraulic oil to enter the plug-in type overflow assembly (200) during overflow; the valve sleeve (211) is in threaded connection with the valve block (100), the valve seat (201) is in clamping fit with the valve sleeve (211), and the radial hole in the valve sleeve (211) is used for discharging oil to the overflow oil outlet hole (104) and the process hole (110); the adjusting piece is arranged outside the valve sleeve (211), the first spring (210) is located between the spring seat (209) and the guide sleeve (212) and enables the spring seat (209) to abut against the first valve core (203), and the guide sleeve (212) abuts against the adjusting piece.

3. An auxiliary valve block as claimed in claim 2, wherein: the adjusting part comprises an adjusting rod (213), an adjusting sleeve (214) and a locking nut (215), the guide sleeve (212) is sleeved on the adjusting rod (213), the adjusting rod (213) is inserted into the adjusting sleeve (214) and is in threaded fit with the adjusting sleeve (214), the adjusting sleeve (214) is in threaded fit with the valve sleeve (211), the locking nut (215) is in threaded fit with the adjusting rod (213), and the locking nut (215) is used for screwing after the pressure adjusting rod (213) adjusts.

4. An auxiliary valve block as claimed in claim 1, wherein: and a second spring (327) and a steel ball (325) are installed on one side, close to the rotating shaft (340), of the screw cap (328), and the second spring (327) is used for pushing the steel ball (325) to be in clamping fit with a positioning groove in the rotating shaft (340).

5. An auxiliary valve block as claimed in claim 4, wherein: two ends of the rotating shaft (340) are sleeved with copper sleeves (329) which are in running fit with the front cover (320), and a Glae ring (324) is arranged between the copper sleeves (329) and the rotating shaft (340).

Technical Field

The invention relates to the technical field of hydraulic pressure, in particular to an auxiliary valve bank.

Background

In the engineering machinery, the action of a mechanical oil cylinder needs to be manually controlled outside a cab in certain occasions, so that the used hydraulic device is generally arranged at a position, close to the periphery, of the engineering machinery, and high requirements are provided for the convenience and the volume of operation and control and the capability of resisting the severe environment around.

Disclosure of Invention

In order to improve the convenience of operation and the adaptability to the environment, the invention aims to provide an auxiliary valve group.

The above object of the present invention is achieved by the following technical solutions:

an auxiliary valve group comprises a valve block, a plug-in overflow assembly and a reversing assembly;

the valve body comprises a first oil port, an oil inlet channel, an overflow oil inlet hole, an overflow oil outlet hole, a reversing oil inlet hole, a first oil outlet channel, a second oil outlet channel, a backflow channel, a fourth oil port, a fabrication hole, an oil return hole, a first oil outlet hole, a second oil port and a third oil port; the first oil port is connected with an external oil inlet pipeline, the inside of the first oil port is communicated with an overflow oil inlet hole through an oil inlet channel, and the plug-in type overflow assembly is installed in a plug-in hole communicated with the overflow oil inlet hole and the overflow oil outlet hole; one end of the reversing oil inlet hole is communicated with the overflow oil inlet hole, and the other end of the reversing oil inlet hole is communicated with the top surface of the valve block and communicated with the reversing assembly; one end of the first outflow channel is communicated with the first oil outlet to the second oil port, and the other end of the first outflow channel is communicated with the reversing assembly; one end of the second outflow channel is communicated with the second oil outlet to the third oil port, and the other end of the second outflow channel is communicated with the reversing assembly; one end of the return channel is communicated with the process hole, the inclined hole to the fourth oil port, and the other end of the return channel is communicated with the reversing assembly; the process hole penetrates through the overflow oil outlet hole;

the plug-in type overflow assembly comprises a valve seat, an inner boss, a first valve core, an oil inlet inclined hole, an overflow hole, a spring seat, a first spring, a valve sleeve, a guide sleeve and an adjusting piece; the valve seat is internally provided with a first valve core, the inner boss protrudes out of the inner wall of the valve seat and is used for limiting the stroke of the first valve core, the opening and closing of overflow are controlled at the position where the end surface of an inner hole of the valve seat is matched with the conical surface of the first valve core, and a gap is reserved between the inner hole of the valve seat and the cylindrical matching surface of the first valve core; the combined sealing gasket separates a high-pressure overflow area from a low-pressure oil return area; the oil inlet inclined holes are uniformly distributed at the junction of the end surface of the large excircle and the small excircle of the valve seat and are channels for hydraulic oil to enter the plug-in type overflow assembly during overflow; the valve sleeve is in threaded connection with the valve block, the valve seat is in clamping fit with the valve sleeve, and the radial hole in the valve sleeve is used for discharging oil to the overflow oil outlet hole and the process hole; the adjusting piece is arranged outside the valve sleeve, the first spring is positioned between the spring seat and the guide sleeve, the spring seat is abutted against the first valve core, and the guide sleeve is abutted against the adjusting piece;

the reversing assembly comprises a valve body, a rear cover, a threaded sleeve, a rear pin shaft, a tower-shaped spring, a second valve core, a first flow passage, a second flow passage, a third flow passage, a fourth flow passage, a fifth flow passage, a front pin shaft, a front cover, a sliding rod, a threaded cover, a handle rod, a first reversing hole, a second reversing hole, a third reversing hole, a fourth reversing hole, a fifth reversing hole and a rotating shaft; the second valve core is arranged in a main through hole of the valve body, the first flow passage, the second flow passage, the third flow passage, the fourth flow passage and the fifth flow passage are positioned in the main through hole, and the first flow passage, the second flow passage, the third flow passage, the fourth flow passage and the fifth flow passage are respectively communicated with the first reversing hole, the second reversing hole, the third reversing hole, the fourth reversing hole and the fifth reversing hole correspondingly; two ends of the valve body are respectively matched with the rear cover and the front cover, and a threaded sleeve, a rear pin shaft, a front pin shaft and a tower-shaped spring are respectively arranged at the front end and the rear end of the main hole; a sliding rod is arranged in the front cover, and one end of a front pin shaft is fixedly arranged in the sliding rod; the rotating shaft is installed on the front cover, the handle rod is installed on the rotating shaft, and the screw cap is installed on the front cover.

In a preferred embodiment of the present invention, the adjusting member includes an adjusting rod, an adjusting sleeve, and a lock nut, the guide sleeve is sleeved on the adjusting rod, the adjusting rod is inserted into the adjusting sleeve and is in threaded fit with the adjusting sleeve, the adjusting sleeve is in threaded fit with the valve sleeve, the lock nut is in threaded fit with the adjusting rod, and the lock nut is used for screwing after the pressure adjusting of the adjusting rod is finished.

In a preferred embodiment of the invention, a second spring and a steel ball are mounted on one side of the screw cap close to the rotating shaft, and the second spring is used for pushing the steel ball to be in clamping fit with the positioning groove on the rotating shaft.

In a preferred embodiment of the invention, two ends of the rotating shaft are sleeved with copper sleeves which are in running fit with the front cover, and a Glare ring is arranged between the copper sleeves and the rotating shaft.

In summary, the present application includes at least one of the following beneficial technical effects:

the invention provides an auxiliary valve group, which is matched with a plug-in type plug-in overflow assembly and a manual reversing assembly, has the advantages of less exposed core parts, compact structure, small volume and convenient operation, reduces the influence caused by environmental corrosion and prolongs the service life.

Drawings

FIG. 1 is a schematic cross-sectional view of an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of the M-M face of the reversing assembly of FIG. 1;

FIG. 3 is a schematic view of the A-direction structure of the reversing assembly in FIG. 1;

FIG. 4 is a top view of a valve block in an embodiment of the present invention;

FIG. 5 is a schematic view of the valve block of FIG. 4 in the direction of B;

FIG. 6 is a schematic cross-sectional view of the valve block of FIG. 5 taken on the N-N side;

fig. 7 is a schematic structural view of the valve block C in fig. 4.

Description of reference numerals: 100. a valve block; 101. a first oil port; 102. an oil inlet channel; 103. an overflow oil inlet hole; 104. an overflow oil outlet; 105. a reversing oil inlet hole; 106. a first outlet channel; 107. a second outlet channel; 108. a return channel; 109. a fourth oil port; 110. a fabrication hole; 111. plugging a screw hole; 112. an oil return hole; 113. a first oil outlet hole; 114. a second oil outlet hole; 115. a second oil port; 116. a third oil port;

200. a plug-in overflow assembly; 201. a valve seat; 202. an inner boss; 203. a first valve spool; 204. a combination seal gasket; 205. an oil inlet inclined hole; 206. a collar; 207. an overflow aperture; 208. a seal ring; 209. a spring seat; 210. a first spring; 211. a valve housing; 212. a guide sleeve; 213. adjusting a rod; 214. an adjusting sleeve; 215. locking the nut; 216. a steel wire retainer ring; 217. a first retainer ring; 218. a seal ring; 219. a seal ring;

300. a commutation assembly; 301. a valve body; 302. a gasket; 303. a rear cover; 304. a threaded sleeve; 305. a rear pin shaft; 306. a seal ring; 307. a second retainer ring; 308. a tower-shaped spring; 309. a steel wire retainer ring; 310. a seal ring; 311. a second valve core; 312. a first flow passage; 313. a second flow passage; 314. a third flow path; 315. a fourth flow path; 316. a fifth flow channel; 317. a front pin shaft; 318. a seal ring; 319. tightening the screw; 320. a front cover; 321. a slide bar; 322. a seal ring; 323. a screw pin; 324. a Glare circle; 325. a steel ball; 326. a seal ring; 327. a second spring; 328. a screw cap; 329. a copper sleeve; 330. a handle bar; 331. a first reversing hole; 332. a second reversing hole; 333. a third reversing hole; 334. a fourth reversing hole; 335. a fifth reversing hole; 340. a rotating shaft.

Detailed Description

In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the invention is further described in detail with reference to the attached drawings 1-7.

The invention discloses an auxiliary valve bank. Referring to fig. 1 to 7, the auxiliary valve block includes a valve block 100, a cartridge type overflow assembly 200, and a direction changing assembly 300, wherein the cartridge type overflow assembly 200 is fixedly installed inside the valve block 100, and the direction changing assembly 300 is fixedly installed on the top of the valve block 100.

The valve body 100 includes a first oil port 101, an oil inlet channel 102, an overflow oil inlet hole 103, an overflow oil outlet hole 104, a reversing oil inlet hole 105, a first oil outlet channel 106, a second oil outlet channel 107, a return channel 108, a fourth oil port 109, a fabrication hole 110, a plug screw hole 111, an oil return hole 112, a first oil outlet hole 113, a second oil outlet hole 114, a second oil port 115, and a third oil port 116.

The plug-in overflow assembly 200 comprises a valve seat 201, an inner boss 202, a first valve core 203, a combined sealing gasket 204, an oil inlet inclined hole 205, a collar 206, an overflow hole 207, a spring seat 209, a first spring 210, a valve sleeve 211, a guide sleeve 212, an adjusting rod 213, an adjusting sleeve 214, a locking nut 215, a wire retainer 216 and a first retainer ring 217.

The reversing assembly 300 comprises a valve body 301, a rear cover 303, a threaded sleeve 304, a rear pin 305, a second retainer 307, a tower-shaped spring 308, a wire retainer 309, a second valve core 311, a first flow passage 312, a second flow passage 213, a third flow passage 314, a fourth flow passage 315, a fifth flow passage 316, a front pin 317, a set screw 319, a front cover 320, a sliding rod 321, a threaded pin 323, a Glae ring 324, a steel ball 325, a second spring 327, a threaded cover 328, a copper sleeve 329, a handle rod 330, a first reversing hole 331, a second reversing hole 332, a third reversing hole 333, a fourth reversing hole 334, a fifth reversing hole 335 and a rotating shaft 340.

In this embodiment, the first port 101 is used to connect an external oil inlet pipeline, the inside of the first port communicates with the overflow oil inlet 103 via the oil inlet channel 102, and the cartridge overflow assembly 200 is installed in a cartridge hole formed by the series of the overflow oil inlet 103 and the overflow oil outlet 104.

The reversing oil inlet hole 105 has one end communicated with the overflow oil inlet hole 103 and the other end communicated with the top surface of the valve block 100, and is finally communicated with the first reversing hole 331 at the bottom surface of the reversing assembly 300.

One end of the first flow outlet channel 106 is communicated with the first oil outlet hole 113 to the second oil outlet hole 115, and the other end is communicated with the top surface of the valve block 100 and finally communicated with the second reversing hole 332 at the bottom surface of the reversing assembly 300.

One end of the second oil outlet channel 107 is communicated with the third oil port 116 through the second oil outlet hole 114, and the other end is communicated with the top surface of the valve block 100 and finally communicated with the third reversing hole 333 at the bottom surface of the reversing assembly 300.

One end of the return channel 108 is communicated with the process hole 110, the inclined hole 112 to the fourth oil port 109, and the other end is communicated with the top surface of the valve block 100, and finally communicated with the fourth reversing hole 334 and the fifth reversing hole 335 on the bottom surface of the reversing assembly 300.

The fabrication hole 110 penetrates through the overflow oil outlet 104, and the plug hole 111 is arranged at the proximal end face of the fabrication hole 110 and is used for installing a plug to plug the opening of the fabrication hole 110 at the outside.

The first valve core 203 is arranged in the valve seat 201, two pits which are uniformly distributed along the circumference are formed in the groove of the outer circle of the valve seat 201 after the first valve core 203 is arranged, corresponding inner bosses 202 are formed on the inner hole wall of the valve seat 201 by the pits, and the pits are positioned in the wide groove range of the outer circle of the first valve core 203 and used for limiting the stroke of the first valve core 203 so that the first valve core 203 is not separated from the guide of the inner hole of the valve seat 201.

The opening and closing of the overflow is controlled at the position where the end face of the inner hole of the valve seat 201 is matched with the conical surface of the first valve core 203, a gap is reserved between the inner hole of the valve seat 201 and the cylindrical matching surface of the first valve core 203, the gap has a guiding function, a damping function is achieved, the pressure stability during the overflow is guaranteed, and the noise is reduced.

The combination seal 204 separates the high pressure spill area from the low pressure return area. The oil inlet inclined holes 205 are uniformly distributed at the junction of the end surface of the large excircle and the small excircle of the valve seat 201, and are channels for hydraulic oil to enter the plug-in type overflow assembly 200 when overflow is needed. A collar 206 connects valve seat 201 with valve housing 211.

The radial hole 207 in the valve sleeve 211 discharges the overflowing oil to the overflow outlet 104 and the process hole 110.

The sealing ring 208 isolates the hydraulic oil inside the cartridge spill assembly 200 from the outside. One end of the spring seat 209 is provided with a taper hole which is matched with a ball head at one end of the valve core 203 to form line contact, so that the compression force of the spring 210 acting on the spring seat 209 can prop against the valve core 203 in an axial force mode, and the single side of the valve core 203 is not stressed by radial component force, so that the phenomenon that the contact position of the inclined plane of the valve core 203 and the valve seat 201 is uneven in opening when overflowing, and pressure instability and noise are caused is avoided.

The guide sleeve 212 is sleeved on the adjusting rod 213 and is blocked by the steel wire retaining ring 216, and the large end face of the guide sleeve abuts against the first spring 210. Adjustment sleeve 214 is internally threaded with adjustment rod 213 and externally threaded into the internal threads of valve sleeve 211. The lock nut 215 is screwed after the pressure adjustment of the adjustment lever 213 is completed, and prevents the adjustment lever 213 from loosening and causing a change in the set pressure.

A sealing ring 218 is arranged in the inner stepped hole of the adjusting sleeve, and the other end of the sealing ring is blocked by a retaining ring 217 and is used for sealing between the adjusting rod 213 and the adjusting sleeve 214. A sealing ring 218 is responsible for sealing between the adjustment sleeve 214 and the valve housing 211.

The valve body 301 is provided with a main hole in a penetrating manner, the second valve core 311 is installed in the main hole, the main hole is internally provided with a first flow passage 312, a second flow passage 313, a third flow passage 314, a fourth flow passage 315 and a fifth flow passage 316 which are communicated through internal flow passages, the first flow passage 312 is communicated with the first reversing hole 331, the second flow passage 313 is communicated with the second reversing hole 332, the third flow passage 314 is communicated with the third reversing hole 333, the fourth flow passage 315 is communicated with the fourth reversing hole 334, and the fifth flow passage 316 is communicated with the fifth reversing hole 335.

The rear end face of the valve body 301 is provided with a sealing gasket 302 and a rear cover 303, and the front end and the rear end of the main hole are respectively provided with a threaded sleeve 304 (front and rear), a rear pin 305 (rear), a front pin 317 (front), a sealing ring 306 (front and rear), a second retaining ring 307 (front and rear), a tower-shaped spring 308 (front and rear), a steel wire retaining ring 309 (front and rear) and a sealing ring 310 (front and rear).

The front end surface of the valve body 301 is provided with a sealing ring 318 and a front cover 320. The front cover 320 is provided with a longitudinal blind hole in which a sliding rod 321 is arranged, and one end of a front pin 317 is arranged in the middle blind hole of the sliding rod 321 and fixed by two fastening screws 319.

The front cover 320 is internally provided with a transverse through hole which is deviated from the longitudinal blind hole and is internally provided with a rotating shaft 340, and two ends of the through hole are provided with copper sleeves 329 which are matched with the rotating shaft 340 made of steel materials, so that rusting and adhesion can be avoided.

Two Glare rings 324 are arranged between the copper sleeve 329 and the rotating shaft 340, which can seal and reduce the rotating resistance of the rotating shaft 340.

The screw 323 connects the rotating shaft 340 and the sliding rod 321 together, and the sealing gasket 322 prevents oil from leaking outside.

The screw cap 328 and the sealing ring 326 are mounted on the front cover 320, and a steel ball 325 which can be clamped in a middle positioning groove of the rotating shaft 340 and a spring 327 which presses the steel ball 325 are arranged in the screw cap to play a positioning role.

The handle 330 is mounted on the shaft 340 for manually rotating the shaft 340.

During operation, hydraulic oil gets into from first hydraulic fluid port 101, through oil feed passage 102 to overflow inlet port 103, and the subdivision is two the tunnel: one path to the diverting assembly 300 and the other path to the cartridge overflow assembly 200. The following three working conditions are provided:

first, when the handle bar is in the middle position

The tower-shaped springs 308 at both ends press the second stopper 307 so that the seal ring 306 does not come off. The rear pin 305 has the same diameter, i.e., the same cross-sectional area, as the front pin 317, so that even if the two ends of the second spool 311 are subjected to hydraulic oil pressure, the two ends are balanced and cannot move forward or backward. The steel ball 325 in the oblique screw cap 328 of the front cover 320 is embedded in the left lower positioning groove of the rotating shaft 340 under the pressure of the spring 327, and the rotating shaft 340 cannot move → the sliding rod 321 does not move → the front pin 317 → the second valve core 311 does not move under the condition that the handle 330 is not manually pushed or pulled.

To the reversing assembly 300: the hydraulic oil enters the reversing oil inlet hole 105 from the overflow oil inlet hole 103, enters the first reversing hole 331, enters the first flow passage 312, passes through a hole in the middle of the second valve core 311 and a groove communicated with the middle hole, enters the fourth flow passage 315 and the fifth flow passage 316, and then enters the fourth reversing hole 334 and the fifth reversing hole 335 in the bottom surface of the valve body 301. The top surface of the valve block 100 has no passage at the contact position with the fifth reversing hole 335, and the hydraulic oil enters the return passage 108 from the fourth reversing hole 334, then enters the fourth oil port 109 through the oil return hole 112, and returns to the oil tank through the external pipeline, so that the hydraulic oil has no load pressure at this time. The second flow passage 313, the third flow passage 314 and the first flow passage 312 are isolated from hydraulic oil, the corresponding second oil port 115, the corresponding third oil port 116 and the corresponding external connecting pipe communicated with the oil cylinder have no hydraulic oil, and the oil cylinder is in a non-working state.

To cartridge overflow assembly 200: because of the absence of pressure, no overflow is required.

When the handle bar is pushed forwards

The rotating shaft 340 rotates clockwise, the screw 323 drives the sliding rod 321 to move backwards → the front pin 317 → the second valve core 311 to move backwards, the steel ball 325 in the vertical screw cap 328 on the front cover 320 is embedded in the middle positioning groove of the rotating shaft 340 under the pressure of the spring 327, and under the condition that the handle lever 330 is not manually pushed and pulled, the rotating shaft 340 cannot move → the sliding rod 321 does not move → the front pin 317 → the Duel valve core 311 does not move, and is kept at the backward movement position.

To the reversing assembly 300: the hydraulic oil enters the reversing oil inlet hole 105 from the overflow oil inlet hole 103, enters the first reversing hole 331, enters the first flow channel 312, passes through the groove of the second valve core 311, enters the third flow channel 314, further enters the third reversing hole 333 on the bottom surface of the valve body 301, enters the second flow outlet channel 107 on the top surface of the valve block 100, passes through the second oil outlet hole 114, the third oil port 116 and an external pipeline, and reaches the oil cylinder, so as to push the piston of the oil cylinder to act. The hydraulic oil returned from the other end of the oil cylinder returns to the second oil port 115 through an external pipeline, then returns to the fourth oil port 109 through the first oil outlet 113, the first flow outlet channel 106, the second reversing hole 332, the second flow channel 313, the second valve core 311 groove, the fourth flow channel 315, the fourth reversing hole 334, the return channel 108 and the oil return hole 112 through an external pipeline, and finally returns to the oil tank to complete an oil circuit circulation.

To cartridge overflow assembly 200: because the oil cylinder is in a working state, in order to prevent the pipeline burst accident caused by overload of the oil cylinder load or unlimited pressure rise after the oil cylinder is jacked to the head, the maximum pressure needs to be limited, namely, overflow pressure limitation. Hydraulic oil flows from the overflow oil inlet hole 103 to the inner hole of the valve seat 201 through the oil inlet inclined hole 205, flows to the tail end of the first valve core 203 through a gap between the valve seat 201 and the first valve core 203, pushes the first valve core 203 to move to jack the spring seat 209, opens a conical sealing opening between the first valve core 203 and the valve seat 201, namely, opens overflow, so that the pressure does not rise any more, the overflow pressure is set by the adjusting rod 213 adjusting the compression amount of the spring 210, and the locking nut 215 is used for locking after the adjustment is finished. The overflowed hydraulic oil flows through the overflow hole 207, the process hole 110, the oil return hole 112 to the fourth oil port 109, and returns to the oil tank through the external pipeline.

When the handle lever is pushed backwards

The rotating shaft 340 rotates counterclockwise, the screw 323 drives the sliding rod 321 to move forward → the front pin 317 → the second valve core 311 to move forward, the steel ball 325 in the vertical screw cap 328 on the front cap 320 is embedded in the upper right corner positioning groove of the rotating shaft 340 under the pressure of the second spring 327, and the rotating shaft 340 cannot move → the sliding rod 321 does not move → the front pin 317 → the second valve core 311 does not move and is kept at the forward position under the condition that the handle lever 330 is not manually pushed and pulled.

To the reversing assembly 300: the hydraulic oil enters the reversing oil inlet hole 105 from the overflow oil inlet hole 103, enters the first reversing hole 331, enters the first flow channel 312, passes through the groove of the second valve core 311, enters the second flow channel 313, further enters the second reversing hole 332 on the bottom surface of the valve body 301, enters the first flow outlet channel 106 on the top surface of the valve block 100, passes through the first oil outlet hole 113, the second oil port 115 and an external pipeline, and reaches the oil cylinder, so that the piston of the oil cylinder is pushed to act. The hydraulic oil returned from the other end of the oil cylinder returns to the third oil port 116 through an external pipeline, then returns to the fourth oil port 109 through the second oil outlet 114, the second flow outlet channel 107, the third reversing hole 333, the third flow channel 314, the second valve core 311 groove, the fifth flow channel 316, the internal channel, the fourth flow channel 315, the fourth reversing hole 334, the return channel 108 and the oil return hole 112 through an external pipeline, and finally returns to the oil tank through an external pipeline, so that an oil circuit circulation is completed.

To cartridge overflow assembly 200: the same as the handle bar is pushed forward.

The invention provides an auxiliary valve group, which is matched with a plug-in type plug-in overflow assembly 200 and a manual reversing assembly 300, has few exposed core parts, compact structure, small volume and convenient operation, reduces the influence caused by environmental corrosion and prolongs the service life.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.