Oil circuit system for double rack hydraulic cylinders

Abstract

The utility model discloses a kind of oil circuit systems for double rack hydraulic oil cylinder, including main box, the both ends of main box are respectively equipped with the cylinder barrel of being set in pairs, the end of each cylinder barrel is fixedly installed with cover plate;Slidingly installed with piston in each cylinder barrel, gear wheel is equipped in main box with its rotation connection;The cylinder barrel of main box is respectively equipped with first chamber, second chamber, third chamber and fourth chamber, first rack is equipped between first chamber and second chamber with gear wheel engagement, the both ends of first rack are all installed with piston;Second rack is equipped between third chamber and fourth chamber with gear wheel engagement, the both ends of second rack are all installed with piston;First oil circuit component is equipped between first chamber and fourth chamber with each other intercommunication, second oil circuit component is equipped between second chamber and third chamber with each other intercommunication.The utility model uses double rack to drive gear wheel rotation, pass through oil circuit between oil cavity of staggered arrangement and lead, reduce the number of oil inlet pipeline.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic cylinder technology, specifically relating to an oil circuit system for a double rack hydraulic cylinder. Background Technology

[0002] A rack and pinion cylinder is a commonly used hydraulic cylinder. It moves a piston within the cylinder body via an oil circuit. The piston is connected to a rack, and when the piston moves the rack, the rack drives the gear to rotate. A patent with publication number CN209818416U discloses a rack and pinion cylinder, including a cylinder body. A connecting joint is fixedly installed on the top of the cylinder body. The outer wall of the connecting joint has external threads, and a sealing gasket is fitted onto the outer wall of the connecting joint. A connecting sleeve is connected to the outer thread of the connecting joint, and a rotating ring is fixedly installed on the top of the connecting sleeve. Existing rack and pinion cylinders use a single rack to drive the gear, resulting in relatively low torque and a tendency for the gear and rack to jam. Two oil chambers are located on either side of the piston in the cylinder body, each with an oil inlet pipe. Furthermore, the oil inlet pipes are located on both sides of the cylinder body, making the installation and layout cumbersome. Therefore, a hydraulic circuit system for a double rack hydraulic cylinder needs to be designed to overcome these difficulties. Summary of the Invention

[0003] This invention addresses the problems existing in the prior art by designing an oil circuit system for a double rack hydraulic cylinder. This invention uses a double rack to drive the gears to rotate, and the staggered oil chambers are connected by an oil circuit, reducing the number of oil inlet pipes.

[0004] The objective of this invention is achieved through the following technical solution: an oil circuit system for a double rack hydraulic cylinder, comprising a main housing, with paired cylinders at both ends of the main housing, each cylinder having a cover plate fixedly installed at its end; a piston is slidably installed inside each cylinder, and a gear is rotatably connected to the piston inside the main housing; the cylinders of the main housing are respectively provided with a first chamber, a second chamber, a third chamber, and a fourth chamber, a first rack meshing with the gear is provided between the first and second chambers, and pistons are installed at both ends of the first rack; a second rack meshing with the gear is provided between the third and fourth chambers, and pistons are installed at both ends of the second rack; a first oil circuit assembly is provided between the first and fourth chambers, and a second oil circuit assembly is provided between the second and third chambers.

[0005] Preferably, the cylinder containing the first chamber and the cylinder containing the second chamber are coaxially arranged, and the cylinder containing the third chamber and the cylinder containing the fourth chamber are coaxially arranged; the cylinder containing the first chamber and the cylinder containing the third chamber are arranged vertically side by side and parallel to each other, and the first rack and the second rack are arranged vertically side by side and parallel to each other; one end of the first rack is located in the first chamber, and the other end of the first rack is located in the second chamber; one end of the second rack is located in the third chamber, and the other end of the second rack is located in the fourth chamber.

[0006] Preferably, a first oil circuit assembly is provided between the first chamber and the fourth chamber, the first oil circuit assembly including a first oil circuit body and a pair of transfer pipe assemblies. The first oil circuit body is disposed in the main housing, and a transfer pipe assembly for transfer is provided between the first oil circuit body on the main housing and each of the cover plates. A second oil circuit assembly is provided between the second chamber and the third chamber, the second oil circuit assembly including a second oil circuit body and a pair of transfer pipe assemblies. The second oil circuit body is also disposed in the main housing, and a transfer pipe assembly for transfer is provided between the second oil circuit body on the main housing and each of the cover plates.

[0007] Preferably, both ends of the first oil circuit body are connected to adjacent cover plates via transfer pipe assemblies; one of the cover plates communicates with the first chamber, and the other cover plate communicates with the fourth chamber; a first channel is provided in the cover plate near the first chamber, which communicates with the transfer pipe assembly and the first chamber respectively; a fourth channel is provided in the cover plate near the fourth chamber, which communicates with the transfer pipe assembly and the fourth chamber respectively; a first oil inlet connector is also provided in the cover plate near the first chamber, which communicates with the first channel and the first chamber respectively; a first plug is provided in the cover plate near the fourth chamber, and the first channel and the fourth channel are interconnected.

[0008] Preferably, both ends of the second oil circuit body are connected to adjacent cover plates via a transfer pipe assembly; one of the cover plates communicates with the second chamber, and the other cover plate communicates with the third chamber; a third channel is provided in the cover plate near the third chamber, and the third channel communicates with the transfer pipe assembly and the third chamber respectively; a second channel is provided in the cover plate near the second chamber, and the second channel communicates with the transfer pipe assembly and the second chamber respectively; a second oil inlet connector is also provided in the cover plate near the third chamber, and the second oil inlet connector communicates with the third channel and the third chamber respectively; a second plug is provided in the cover plate near the second chamber, and the second channel and the third channel are interconnected.

[0009] Hydraulic oil is supplied to the first chamber through the first inlet connector. Part of the hydraulic oil enters the first chamber; the other part flows along the first channel into the transfer piping assembly; then from the transfer piping assembly into the first hydraulic circuit body, then into the fourth channel, and finally into the fourth chamber. This causes the first and second racks to move towards each other, thus rotating the gear. Similarly, hydraulic oil is supplied to the third chamber through the second inlet connector. Part of the hydraulic oil enters the third chamber; the other part flows along the third channel into the transfer piping assembly; then from the transfer piping assembly into the second hydraulic circuit body, then into the second channel, and finally into the second chamber. This causes the first and second racks to move towards each other, thus rotating the gear. Injecting hydraulic oil into the chambers within the main housing through the first and second inlet connectors facilitates control of the gear's forward and reverse rotation. The main housing is equipped with a first chamber, a second chamber, a third chamber, and a fourth chamber. Only two external oil inlet pipes need to be connected via the first and second oil inlet connectors to supply oil to the chambers of the main housing; this reduces the number of oil inlet pipes. Furthermore, the first and second oil inlet connectors are located on the same side of the main housing, facilitating the installation layout of the oil inlet pipes, making connection easier and saving space. The oil inlet pipes are existing, publicly available connecting hoses, not shown in the accompanying drawings. The first oil inlet connector and the first plug are positioned opposite each other, both adaptable to be installed on the cover plate, facilitating switching of the oil inlet direction; similarly, the second oil inlet connector and the second plug are positioned opposite each other, both adaptable to be installed on the cover plate.

[0010] Preferably, the transfer piping assembly includes a rigid pipe body, and each end of the rigid pipe body is provided with a seal and a retaining ring; one end of the rigid pipe body is inserted into the cover plate, and the other end of the rigid pipe body is inserted into the main housing.

[0011] Preferably, the cover plate has a first mounting groove, in which an adjacent sealing element and a retaining ring are provided; the main housing has a second mounting groove, in which an adjacent sealing element and a retaining ring are also provided; the sealing element and the retaining ring are both sleeved on the rigid pipe body; the cover plate also has a first transition groove adjacent to the first mounting groove, and the first mounting groove and the first transition groove are integrally formed; the main housing also has a second transition groove adjacent to the second mounting groove, and the second mounting groove and the second transition groove are integrally formed; one end of the rigid pipe body is inserted into the first transition groove, and the other end of the rigid pipe body is inserted into the second transition groove; the end of the rigid pipe body can move axially relative to the first transition groove or the second transition groove.

[0012] Preferably, a bearing is provided between the gear and the main housing to connect the two; the outer contour of the first rack is adapted to the outer contour of the cylinder, and the outer contour of the second rack is adapted to the outer contour of the cylinder; a gap is left between the first rack and the inner wall of the cylinder, and a gap is left between the second rack and the inner wall of the cylinder; a bearing bush for limiting and guiding is provided between the first rack and the main housing, and a bearing bush for limiting and guiding is provided between the second rack and the main housing; the bearing bush is fixedly installed in the main housing.

[0013] Preferably, a number of fixing rods are provided between the main housing and the cover plate for fixing, and the fixing rods are evenly distributed on the outside of the cylinder.

[0014] Two paired transfer pipe assemblies are installed between the first and fourth chambers. The first chamber is connected to one end of the first oil circuit body via the transfer pipe assembly, and the fourth chamber is connected to the other end of the first oil circuit body via the same assembly, thus enabling the first and fourth chambers to be interconnected. Similarly, the second chamber is connected to one end of the second oil circuit body via the same transfer pipe assembly, and the third chamber is connected to the other end of the second oil circuit body via the same assembly, thus enabling the second and third chambers to be interconnected. Seals and retaining rings are installed at both ends of the rigid pipe body, resulting in better sealing between the rigid pipe body and the main housing, as well as better sealing between the rigid pipe body and the cover plate, thereby ensuring reliable sealing under high oil pressure. By setting a first mounting slot and a second mounting slot, the sealing components and retaining rings are easily positioned and installed. The rigid pipe body is installed horizontally between the main housing and the cover plate, with a small amount of axial movement space within either the first or second transition slot. This allows for a certain tolerance margin during assembly of the main housing, cover plate, and rigid pipe body, making assembly more convenient and precise, effectively avoiding assembly failures due to design errors. The transition piping assembly not only has good sealing performance but also improves assembly efficiency and overall reliability.

[0015] By setting bearing bushes to limit and guide the first and second racks, the movement of the first and second racks is more stable, thus reliably driving the gears to rotate; by setting a fixing rod, the connection between the main housing and the cover plate is more reliable.

[0016] Compared with the prior art, the present invention has the following advantages: 1. The main body is provided with a first chamber, a second chamber, a third chamber and a fourth chamber in pairs. Oil supply can be completed through only two first oil inlet connectors and two second oil inlet connectors, reducing the number of external oil inlet pipes, simplifying the overall layout and saving space; 2. The oil passage in the main body and the chamber in the cylinder are easily connected by the transfer pipe assembly, with good connection sealing and easy installation; 3. Both ends of the rigid pipe body are provided with retaining rings and seals, with good overall sealing and stable and reliable connection. Attached Figure Description

[0017] Figure 1 This is a perspective view of the present utility model; Figure 2 This is a perspective view of the present invention from another angle; Figure 3 This is a schematic diagram of the internal structure of the present invention; Figure 4 This is a schematic diagram of the internal structure of the first oil circuit assembly; Figure 5 for Figure 4 A magnified view of a portion of position A in the middle; Figure 6 for Figure 4 A magnified view of a portion of position B in the middle; Figure 7 This is a schematic diagram of the internal structure of the second oil circuit assembly; The diagram shows the following components: 1. Main housing; 2. Cylinder; 3. Cover plate; 4. Piston; 5. Gear; 6. First chamber; 7. Second chamber; 8. Third chamber; 9. Fourth chamber; 10. First rack; 11. Second rack; 12. First oil circuit assembly; 121. First oil circuit body; 13. Second oil circuit assembly; 131. Second oil circuit body; 14. Transfer pipe assembly; 141. Rigid pipe body; 142. Seal; 143. Retaining ring; 15. First channel; 16. Fourth channel; 17. First oil inlet connector; 18. First plug; 19. Third channel; 20. Second channel; 21. Second oil inlet connector; 22. Second plug; 23. First mounting groove; 24. Second mounting groove; 25. First transfer groove; 26. Second transfer groove; 27. Bearing; 28. Bearing bush; 29. ​​Fixing rod. Detailed Implementation

[0018] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings: like Figures 1 to 7As shown, this embodiment discloses an oil circuit system for a double rack hydraulic cylinder, including a main housing 1, with paired cylinder barrels 2 at both ends of the main housing 1, and a cover plate 3 fixedly installed at the end of each cylinder barrel 2; a piston 4 is slidably installed in each cylinder barrel 2, and a gear 5 rotatably connected to it is provided in the main housing 1; a first chamber 6, a second chamber 7, a third chamber 8, and a fourth chamber 9 are respectively provided in the cylinder barrels 2 of the main housing 1; a first rack 10 meshing with the gear 5 is provided between the first chamber 6 and the second chamber 7, and pistons 4 are installed at both ends of the first rack 10; a second rack 11 meshing with the gear 5 is provided between the third chamber 8 and the fourth chamber 9, and pistons 4 are installed at both ends of the second rack 11; a first oil circuit assembly 12 communicating with each other is provided between the first chamber 6 and the fourth chamber 9, and a second oil circuit assembly 13 communicating with each other is provided between the second chamber 7 and the third chamber 8.

[0019] The cylinder 2 containing the first chamber 6 and the cylinder 2 containing the second chamber 7 are coaxially arranged, as are the cylinder 2 containing the third chamber 8 and the cylinder 2 containing the fourth chamber 9. The cylinder 2 containing the first chamber 6 and the cylinder 2 containing the third chamber 8 are arranged vertically side by side and parallel to each other. The first rack 10 and the second rack 11 are arranged vertically side by side and parallel to each other. One end of the first rack 10 is located in the first chamber 6, and the other end of the first rack 10 is located in the second chamber 7. One end of the second rack 11 is located in the third chamber 8, and the other end of the second rack 11 is located in the fourth chamber 9. A first oil circuit assembly 12 is provided between the first chamber 6 and the fourth chamber 9, which are interconnected. The first oil circuit assembly 12 includes a first oil circuit body 121 and a pair of transfer pipe assemblies 14. The first oil circuit body 121 is located inside the main housing 1. A transfer pipe assembly 14 for transfer is provided between the first oil circuit body 121 on the main housing 1 and each of the cover plates 3. A second oil circuit assembly 13 is provided between the second chamber 7 and the third chamber 8, which are interconnected. The second oil circuit assembly 13 includes a second oil circuit body 131 and a pair of transfer pipe assemblies 14. The second oil circuit body 131 is also located inside the main housing 1. A transfer pipe assembly 14 for transfer is provided between the second oil circuit body 131 on the main housing 1 and each of the cover plates 3. Both ends of the first oil circuit body 121 are connected to adjacent cover plates 3 via transfer pipe assembly 14; one of the cover plates 3 is connected to the first chamber 6, and the other cover plate 3 is connected to the fourth chamber 9; the cover plate 3 near the first chamber 6 is provided with a first channel 15, which is connected to the transfer pipe assembly 14 and the first chamber 6 respectively; the cover plate 3 near the fourth chamber 9 is provided with a fourth channel 16, which is connected to the transfer pipe assembly 14 and the fourth chamber 9 respectively; the cover plate 3 near the first chamber 6 is also provided with a first oil inlet connector 17, which is connected to the first channel 15 and the first chamber 6 respectively; the cover plate 3 near the fourth chamber 9 is provided with a first plug 18, and the first channel 15 and the fourth channel 16 are interconnected. The two ends of the second oil circuit body 131 are respectively connected to the adjacent cover plates 3 through the transfer pipe assembly 14; one of the cover plates 3 is connected to the second chamber 7, and the other cover plate 3 is connected to the third chamber 8; a third channel 19 is provided in the cover plate 3 near the third chamber 8, and the third channel 19 is connected to the transfer pipe assembly 14 and the third chamber 8 respectively; a second channel 20 is provided in the cover plate 3 near the second chamber 7, and the second channel 20 is connected to the transfer pipe assembly 14 and the second chamber 7 respectively; a second oil inlet connector 21 is also provided in the cover plate 3 near the third chamber 8, and the second oil inlet connector 21 is connected to the third channel 19 and the third chamber 8 respectively; a second plug 22 is provided on the cover plate 3 near the second chamber 7, and the second channel 20 and the third channel 19 are interconnected.

[0020] The transfer pipe assembly 14 includes a rigid pipe body 141, and each end of the rigid pipe body 141 is provided with a sealing element 142 and a retaining ring 143; one end of the rigid pipe body 141 is inserted into the cover plate 3, and the other end of the rigid pipe body 141 is inserted into the main housing 1. The cover plate 3 has a first mounting groove 23, in which a sealing element 142 and a retaining ring 143 are arranged adjacently. The main housing 1 has a second mounting groove 24, in which a sealing element 142 and a retaining ring 143 are also arranged adjacently. The sealing element 142 and the retaining ring 143 are both sleeved on the rigid pipe body 141. The cover plate 3 also has a first transition groove 25 adjacent to the first mounting groove 23, and the first mounting groove 23 and the first transition groove 25 are integrally formed. The main housing 1 also has a second transition groove 26 adjacent to the second mounting groove 24, and the second mounting groove 24 and the second transition groove 26 are integrally formed. One end of the rigid pipe body 141 is inserted into the first transition groove 25, and the other end of the rigid pipe body 141 is inserted into the second transition groove 26. The end of the rigid pipe body 141 can move axially relative to the first transition groove 25 or the second transition groove 26. A bearing 27 is provided between the gear 5 and the main housing 1 to connect the two; the outer contour of the first rack 10 is adapted to the outer contour of the cylinder 2, and the outer contour of the second rack 11 is adapted to the outer contour of the cylinder 2; a gap is left between the first rack 10 and the inner wall of the cylinder 2, and a gap is left between the second rack 11 and the inner wall of the cylinder 2; a bearing 28 for limiting and guiding is provided between the first rack 10 and the main housing 1, and a bearing 28 for limiting and guiding is provided between the second rack 11 and the main housing 1; the bearing 28 is fixedly installed inside the main housing 1. A plurality of fixing rods 29 for fixing are provided between the main housing 1 and the cover plate 3, and the fixing rods 29 are evenly distributed on the outer side of the cylinder 2.

[0021] The specific operation process of this embodiment is as follows: Oil is supplied to the first chamber 6 through the first oil inlet connector 17. Part of the hydraulic oil enters the first chamber 6; another part enters the transfer pipe assembly 14 along the first channel 15; then it enters the first oil circuit body 121 from the transfer pipe assembly 14, then the fourth channel 16 from the transfer pipe assembly 14, and finally the fourth chamber 9 from the fourth channel 16. In this way, the first rack 10 and the second rack 11 move towards each other, thereby driving the gear 5 to rotate. Similarly, oil is supplied to the third chamber 8 through the second oil inlet connector 21. Part of the hydraulic oil enters the third chamber 8; another part enters the transfer pipe assembly 14 along the third channel 19; then it enters the second oil circuit body 131 from the transfer pipe assembly 14, then the second channel 20 from the transfer pipe assembly 14, and finally the second chamber 7 from the second channel 20. In this way, the first rack 10 and the second rack 11 move towards each other, thereby driving the gear 5 to rotate. Hydraulic oil is injected into the chambers within the main housing 1 through the first oil inlet connector 17 and the second oil inlet connector 21, facilitating the control of the forward and reverse rotation of the gear 5. The main housing 1 has a first chamber 6, a second chamber 7, a third chamber 8, and a fourth chamber 9. Only two external oil inlet pipes need to be connected through the first oil inlet connector 17 and the second oil inlet connector 21 to supply oil to the chambers of the main housing 1, thus reducing the number of oil inlet pipes. Furthermore, the first oil inlet connector 17 and the second oil inlet connector 21 are located on the same side of the main housing 1, facilitating the installation layout of the oil inlet pipes, making connection easier and saving space. The oil inlet pipes are existing publicly available connecting hoses, not shown in the accompanying drawings. The first oil inlet connector 17 and the first plug 18 are positioned opposite each other, both adaptable to be installed on the cover plate 3, facilitating the switching of the oil inlet direction. Similarly, the second oil inlet connector 21 and the second plug 22 are positioned opposite each other, both adaptable to be installed on the cover plate 3.

[0022] Two paired transfer pipe assemblies 14 are provided between the first chamber 6 and the fourth chamber 9. The first chamber 6 is connected to one end of the first oil circuit body 121 through the transfer pipe assembly 14, and the fourth chamber 9 is connected to the other end of the first oil circuit body 121 through the transfer pipe assembly 14, so that the first chamber 6 and the fourth chamber 9 are in a state of mutual conduction. Similarly, the second chamber 7 is connected to one end of the second oil circuit body 131 through the transfer pipe assembly 14, and the third chamber 8 is connected to the other end of the second oil circuit body 131 through the transfer pipe assembly 14, so that the second chamber 7 and the third chamber 8 are in a state of mutual conduction. Sealing elements 142 and retaining rings 143 are provided at both ends of the rigid pipe body 141, so that the rigid pipe body 141 has better sealing between the main housing 1 and the main casing 1, and also better sealing between the rigid pipe body 141 and the cover plate 3, thereby ensuring reliable sealing under high oil pressure. By setting the first mounting groove 23 and the second mounting groove 24, the sealing element 142 and the retaining ring 143 are conveniently positioned and installed. Here, the rigid pipe body 141 is installed floating left and right between the main housing 1 and the cover plate 3. The rigid pipe body 141 has a small amount of axial movement space in the first transition groove 25 or the second transition groove 26. This allows for a certain tolerance and error rate when the main housing 1, the cover plate 3, and the rigid pipe body 141 are assembled together, making assembly more convenient and with higher assembly accuracy. It can effectively avoid the situation where assembly is impossible due to design errors. The transition pipe assembly 14 not only has good sealing performance but also improves assembly efficiency and overall reliability.

[0023] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A hydraulic circuit system for a double rack and pinion hydraulic cylinder, comprising a main housing (1), characterized in that, The main housing (1) has a pair of cylinders (2) at both ends, and a cover plate (3) is fixedly installed at the end of each cylinder (2); a piston (4) is slidably installed in each cylinder (2), and a gear (5) is provided in the main housing (1) for rotational connection with it; the cylinders (2) of the main housing (1) are respectively provided with a first chamber (6), a second chamber (7), a third chamber (8) and a fourth chamber (9), and a gear (5) is provided between the first chamber (6) and the second chamber (7). A first rack (10) is engaged, and pistons (4) are installed at both ends of the first rack (10); a second rack (11) is provided between the third chamber (8) and the fourth chamber (9) to engage with the gear (5), and pistons (4) are installed at both ends of the second rack (11); a first oil circuit assembly (12) is provided between the first chamber (6) and the fourth chamber (9), and a second oil circuit assembly (13) is provided between the second chamber (7) and the third chamber (8).

2. The hydraulic circuit system for a double rack and pinion hydraulic cylinder according to claim 1, characterized in that, The cylinder (2) containing the first chamber (6) and the cylinder (2) containing the second chamber (7) are coaxially arranged, and the cylinder (2) containing the third chamber (8) and the cylinder (2) containing the fourth chamber (9) are coaxially arranged; the cylinder (2) containing the first chamber (6) and the cylinder (2) containing the third chamber (8) are arranged vertically side by side and parallel to each other, and the first rack (10) and the second rack (11) are arranged vertically side by side and parallel to each other; one end of the first rack (10) is located in the first chamber (6), and the other end of the first rack (10) is located in the second chamber (7); one end of the second rack (11) is located in the third chamber (8), and the other end of the second rack (11) is located in the fourth chamber (9).

3. The hydraulic circuit system for a double rack and pinion hydraulic cylinder according to claim 2, characterized in that, A first oil circuit assembly (12) is provided between the first chamber (6) and the fourth chamber (9) for mutual communication. The first oil circuit assembly (12) includes a first oil circuit body (121) and a pair of transfer pipe assemblies (14). The first oil circuit body (121) is located inside the main housing (1). A transfer pipe assembly (14) for transfer is provided between the first oil circuit body (121) on the main housing (1) and each of the cover plates (3). A second oil circuit assembly (13) is provided between the second chamber (7) and the third chamber (8) for mutual communication. The second oil circuit assembly (13) includes a second oil circuit body (131) and a pair of transfer pipe assemblies (14). The second oil circuit body (131) is also located inside the main housing (1). A transfer pipe assembly (14) for transfer is provided between the second oil circuit body (131) on the main housing (1) and each of the cover plates (3).

4. The hydraulic circuit system for a double rack and pinion hydraulic cylinder according to claim 3, characterized in that, The two ends of the first oil circuit body (121) are respectively connected to the adjacent cover plate (3) through the transfer pipe assembly (14); one of the cover plates (3) is connected to the first chamber (6), and the other cover plate (3) is connected to the fourth chamber (9); the cover plate (3) near the first chamber (6) is provided with a first channel (15), which is connected to the transfer pipe assembly (14) and the first chamber (6) respectively; the cover plate (3) near the fourth chamber (9) is provided with a fourth channel (16), which is connected to the transfer pipe assembly (14) and the fourth chamber (9) respectively; the cover plate (3) near the first chamber (6) is also provided with a first oil inlet connector (17), which is connected to the first channel (15) and the first chamber (6) respectively; the cover plate (3) near the fourth chamber (9) is provided with a first plug (18), and the first channel (15) and the fourth channel (16) are interconnected.

5. The hydraulic circuit system for a double rack and pinion hydraulic cylinder according to claim 3, characterized in that, The two ends of the second oil circuit body (131) are respectively connected to the adjacent cover plate (3) through the transfer pipe assembly (14); one of the cover plates (3) is connected to the second chamber (7), and the other cover plate (3) is connected to the third chamber (8); the cover plate (3) near the third chamber (8) is provided with a third channel (19), which is connected to the transfer pipe assembly (14) and the third chamber (8) respectively; the cover plate (3) near the second chamber (7) is provided with a second channel (20), which is connected to the transfer pipe assembly (14) and the second chamber (7) respectively; the cover plate (3) near the third chamber (8) is also provided with a second oil inlet connector (21), which is connected to the third channel (19) and the third chamber (8) respectively; the cover plate (3) near the second chamber (7) is provided with a second plug (22), and the second channel (20) and the third channel (19) are interconnected.

6. The hydraulic circuit system for a double rack and pinion hydraulic cylinder according to claim 3, characterized in that, The transfer pipe assembly (14) includes a rigid pipe body (141), and each end of the rigid pipe body (141) is provided with a sealing element (142) and a retaining ring (143); one end of the rigid pipe body (141) is inserted into the cover plate (3), and the other end of the rigid pipe body (141) is inserted into the main box (1).

7. The hydraulic circuit system for a double rack and pinion hydraulic cylinder according to claim 6, characterized in that, The cover plate (3) is provided with a first mounting groove (23), and the first mounting groove (23) is provided with a sealing element (142) and a retaining ring (143) arranged adjacently; the main housing (1) is provided with a second mounting groove (24), and the second mounting groove (24) is also provided with a sealing element (142) and a retaining ring (143) arranged adjacently; the sealing element (142) and the retaining ring (143) are both sleeved on the rigid pipe body (141); the cover plate (3) is also provided with a first transition groove (25) arranged adjacent to the first mounting groove (23), the first The mounting groove (23) and the first adapter groove (25) are integrally formed; the main housing (1) is also provided with a second adapter groove (26) adjacent to the second mounting groove (24), the second mounting groove (24) and the second adapter groove (26) are integrally formed; one end of the rigid tube body (141) is inserted into the first adapter groove (25), and the other end of the rigid tube body (141) is inserted into the second adapter groove (26); the end of the rigid tube body (141) can move axially relative to the first adapter groove (25) or the second adapter groove (26).

8. The hydraulic circuit system for a double rack and pinion hydraulic cylinder according to claim 1, characterized in that, A bearing (27) is provided between the gear (5) and the main housing (1) to connect the two; the outer contour of the first rack (10) is adapted to the outer contour of the cylinder (2), and the outer contour of the second rack (11) is adapted to the outer contour of the cylinder (2); a gap is left between the first rack (10) and the inner wall of the cylinder (2), and a gap is left between the second rack (11) and the inner wall of the cylinder (2); a bearing (28) for limiting and guiding is provided between the first rack (10) and the main housing (1), and a bearing (28) for limiting and guiding is provided between the second rack (11) and the main housing (1); the bearing (28) is fixedly installed inside the main housing (1).

9. The hydraulic circuit system for a double rack and pinion hydraulic cylinder according to claim 1, characterized in that, A number of fixing rods (29) for fixing are provided between the main body (1) and the cover plate (3), and the fixing rods (29) are evenly distributed on the outside of the cylinder (2).

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