Hydraulic station assembly

Abstract

The invention discloses a hydraulic station assembly, and relates to the technical field of hydraulic stations, the hydraulic station assembly comprises a case, a motor pump set arranged in the case, and an oil tank arranged on one side of the case and used for supplying oil to the hydraulic station assembly; the pressurizing oil cylinder is used for pressurizing an oil way and comprises a first cylinder body, a first piston cylinder, a second piston cylinder, a second cylinder body and a third cylinder body, the first cylinder body, the first piston cylinder, the second piston cylinder, the second cylinder body and the third cylinder body are fixedly connected through bolts, a large piston is arranged in the first cylinder body, and a small piston is arranged in the second cylinder body. According to the pressure boosting oil cylinder, dynamic buffering protection of the large piston and the small piston can be achieved, violent impact of the pistons caused by oil pressure fluctuation is avoided, and the stability and reliability of operation of the pressure boosting oil cylinder are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic stations, and in particular to a hydraulic station assembly. Background Art

[0002] In the field of hydraulic station technology, the stable operation of the hydraulic system is crucial to the normal operation of various industrial equipment. Among them, the booster cylinder is a key component for achieving oil circuit pressure increase. Its operational stability and reliability directly affect the performance of the entire hydraulic system.

[0003] During actual operation, the oil pressure inside the boost cylinder often fluctuates greatly, resulting in unstable piston movement speed, which in turn causes violent impact between the piston and the cylinder body. This not only affects the boosting effect of the boost cylinder, but may also cause damage to key components such as the piston and cylinder body, greatly shortening the service life of the boost cylinder.

[0004] While existing technologies employ booster cylinders to boost the oil circuit to a certain extent, they typically employ simple rubber cushions and other buffering mechanisms to mitigate oil pressure fluctuations. However, this single buffering structure has limited effectiveness when faced with complex, variable, and high-intensity oil pressure shocks, failing to effectively suppress the violent movement of the piston and failing to meet the high-precision and high-stability requirements of modern industry for hydraulic systems. Therefore, a hydraulic station assembly is urgently needed to address this issue. Summary of the Invention

[0005] The present invention aims to address the shortcomings of the prior art by proposing a hydraulic station assembly. Its advantages include: providing dynamic buffering protection for the large and small pistons, preventing severe piston impacts caused by oil pressure fluctuations, and significantly improving the stability and reliability of the booster cylinder's operation.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A hydraulic station assembly includes a chassis and: A motor pump unit is provided inside the chassis, and an oil tank for supplying oil to the hydraulic station assembly is provided on one side of the chassis; A booster oil cylinder for boosting the oil circuit, the booster oil cylinder comprising a first cylinder body, a first piston cylinder, a second piston cylinder, a second cylinder body and a third cylinder body, the first cylinder body, the first piston cylinder, the second piston cylinder, the second cylinder body and the third cylinder body being fixedly connected by bolts, a large piston being provided inside the first cylinder body, and a small piston being provided inside the third cylinder body; A buffer assembly for protecting the large piston and the small piston; The main circuit return oil filter and circulating return oil filter are used to filter and remove impurities from the hydraulic oil in the oil circuit. The circulating pump unit is used to realize the circulation transmission of the hydraulic oil inside the main circuit return oil filter and circulating return oil filter; Cooler for cooling hydraulic oil.

[0007] Through the above technical solution: dynamic buffer protection of the large piston and the small piston can be achieved, avoiding severe impact of the piston caused by oil pressure fluctuations, and significantly improving the stability and reliability of the boost cylinder operation.

[0008] Preferably, both ends of the first cylinder body are provided with a first cylinder head, one first cylinder head is fixedly connected to the first piston cylinder, one end of the other first cylinder head is fixedly connected to the first sealing cover by bolts, and the circumferential outer wall of the first sealing cover is provided with an oil inlet pipe, and both ends of the third cylinder body are provided with a second cylinder head, one second cylinder head is fixedly connected to the second piston cylinder, one end of the other second cylinder head is fixedly connected to the second sealing cover by bolts, and the circumferential outer wall of the second sealing cover is provided with an oil outlet pipe.

[0009] Through the above technical solution, an input and output channel for the hydraulic oil can be formed, ensuring the connectivity between the booster cylinder 1 and the external oil circuit.

[0010] Preferably, an annular sealing groove is formed on the circumferential outer wall of the large piston and the small piston, and a sealing ring is clamped inside the annular sealing groove.

[0011] Through the above technical solution: the elastic deformation of the sealing ring is used to fill the gap between the piston and the cylinder body, thereby preventing hydraulic oil leakage, ensuring the sealing performance of the booster cylinder, and avoiding the decrease in boosting efficiency due to oil leakage.

[0012] Preferably, a buffer seat is fixedly connected to the circumferential inner wall of the second cylinder body, the cross-section of the buffer seat is convex, a through guide hole is opened in the middle of the buffer seat, the movable column passes through the inside of the guide hole, and the circumferential outer wall of the guide hole fits with the circumferential inner wall of the movable column.

[0013] Through the above technical solution: the buffer seat is fixed to the inner wall of the second cylinder through a convex structure, and its guide hole slides in fit with the movable column, providing precise guidance for the movable column to avoid offset when the large piston and the small piston are linked.

[0014] Preferably, the buffer assembly includes an annular groove opened on the outer wall of one side of the buffer seat, a second spring is provided on the inner wall of one side of the annular groove, and the end of the second spring away from the inner wall of the annular groove is fixedly connected to the buffer plate, and the circumferential outer wall of the buffer plate is in contact with the circumferential inner wall of the second cylinder body.

[0015] Through the above technical solution: when the movable column moves rapidly due to oil pressure impact, the buffer plate can absorb the impact force by compressing the second spring. At the same time, the outer wall of the buffer plate fits with the inner wall of the second cylinder to form a sealed buffer space, thereby enhancing the buffering effect.

[0016] Preferably, one end of the buffer seat is provided with an installation groove and a guide groove which are equidistant and circularly distributed. The installation groove is connected to the guide groove. The guide groove and the installation groove pass through the buffer seat. A first spring is fixedly connected to the inner wall of one side of the installation groove. The end of the first spring away from the inner wall of the installation groove is fixedly connected to a sealing plate for sealing the installation groove and the guide groove.

[0017] Through the above technical solution: when the oil pressure in the guide groove suddenly rises, the high-pressure oil can push the sealing plate to compress the first spring, open the connecting port and release the pressure.

[0018] Preferably, a guide post is fixedly connected to the middle of the sealing plate, a slip ring is slidably connected to the circumferential inner wall of the guide groove, and the slip ring is fixedly connected to the guide post.

[0019] The above technical solution can ensure that the sealing plate slides smoothly along a straight line during the pressure relief process, avoiding sealing failure due to deviation.

[0020] Preferably, one end of the buffer seat is fixedly connected to a limiting cap distributed in a circular shape with equal distances, and the movement of the sealing plate is limited by the limiting cap, and one end of the guide column passes through the middle of the limiting cap.

[0021] Through the above technical solution: the moving stroke of the sealing plate is limited to prevent it from over-compressing the first spring and causing the sealing plate to detach from the installation groove. At the same time, the guide column passes through the middle of the limiting cap to further stabilize the sliding trajectory of the sealing plate.

[0022] Preferably, a circular rod is provided at one end of the buffer seat, and the circular rod is fixedly connected to guide columns distributed in a circular shape at equal distances.

[0023] Through the above technical solution: it is possible to avoid deflection of multiple sets of sealing plates due to uneven force during operation, thereby ensuring the synchronous buffering effect of the buffer assembly.

[0024] Preferably, a guide groove is provided inside the buffer seat, and the two ends of the guide groove are respectively connected to the guide groove and the annular groove. A ring plate is slidably connected inside the annular groove, and the ring plate is fixedly connected to the second spring. One end of the buffer seat is fixedly connected to a retaining ring for limiting the movement of the ring plate.

[0025] Through the above technical solution: when the oil pressure in the guide groove increases, the oil flows into the annular groove through the guide groove, pushing the ring plate to compress the second spring. The ring plate and the buffer plate cooperate to buffer. At the same time, the retaining ring limits the movement range of the ring plate to prevent it from leaving the annular groove, forming a dual buffer mechanism of hydraulic pressure and spring.

[0026] The beneficial effects of the present invention are: 1. The present invention can effectively realize the pressurization of the oil circuit through the design of the area difference between the large piston and the small piston in the booster cylinder, ensuring that the hydraulic system obtains stable high-pressure output. At the same time, the setting of the buffer assembly can realize dynamic buffering protection of the large piston and the small piston when the oil pressure in the booster cylinder is too high and the movement of the movable column is accelerated. The buffer plate compresses the second spring, the ring plate and the second spring work together to enhance the buffering force, and the sealing plate opens the connecting port under the action of high-pressure oil to overflow part of the oil to relieve the pressure peak, etc., to avoid severe impact of the piston due to oil pressure fluctuations, and significantly improve the stability and reliability of the operation of the booster cylinder.

[0027] 2. In the present invention, the main circuit return oil filter and the circulating return oil filter are driven by the circulating pump unit to realize the circulating filtration and impurity removal of the hydraulic oil. The double filtration mechanism can effectively remove impurities in the oil circuit, ensure the cleanliness of the hydraulic oil, and reduce the wear and damage of impurities to system components. The setting of the cooler can cool the hydraulic oil to prevent the performance of the hydraulic oil from degrading due to long-term high working temperature, ensure that the hydraulic system operates stably in a suitable temperature environment, and extend the service life of the hydraulic station assembly.

[0028] 3. In the present invention, the components of the booster cylinder are fixedly connected by bolts, and the structure is stable and convenient for installation, disassembly and maintenance. At the same time, the sealing rings in the annular grooves opened on the outer walls of the large piston and the small piston can effectively prevent the leakage of hydraulic oil and ensure the boosting effect. The convex cross-sectional design of the buffer seat and the fit between the guide hole and the movable column provide precise guidance for the sliding of the movable column, further improving the buffering effect of the buffer assembly and the overall reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall structure of a hydraulic station assembly proposed by the present invention; Figure 2 This is a schematic diagram of the internal top view of a hydraulic station assembly proposed by the present invention; Figure 3 This is a schematic diagram of the overall structure of a booster cylinder of a hydraulic station assembly proposed by the present invention; Figure 4 This is a schematic diagram of a half-section structure of a booster cylinder of a hydraulic station assembly proposed by the present invention; Figure 5 A hydraulic station assembly proposed by the present invention Figure 4 Schematic diagram of the enlarged structure at A in the middle; Figure 6 This is a schematic diagram of a half-section planar structure of a booster cylinder of a hydraulic station assembly proposed by the present invention; Figure 7 A hydraulic station assembly proposed by the present invention Figure 6 Schematic diagram of the enlarged structure at B in the middle; Figure 8 This is a front structural diagram of a buffer component of a hydraulic station assembly proposed by the present invention; Figure 9 This is a schematic diagram of a half-section structure of a buffer component of a hydraulic station assembly proposed by the present invention; Figure 10 This is a schematic diagram of the back structure of a buffer component of a hydraulic station assembly proposed by the present invention.

[0030] Figure: 1. Booster cylinder; 101. First cylinder body; 102. First piston cylinder; 103. Second piston cylinder; 104. Second cylinder body; 105. Third cylinder body; 106. First cylinder head; 107. Second cylinder head; 108. First sealing cover; 109. Movable column; 1010. Second sealing cover; 1011. Oil outlet pipe; 1012. Oil inlet pipe; 1013. Small piston; 1014. Large piston; 1015. Sealing ring; 2. Motor pump unit; 3. Oil tank; 4. Main circuit oil return filter ; 5. Circulating return oil filter; 6. Cooler; 7. Circulating pump unit; 8. Buffer assembly; 801. Buffer seat; 802. Limit cap; 803. Guide column; 804. Ring rod; 805. Sealing plate; 806. Mounting groove; 807. First spring; 808. Slip ring; 809. Guide groove; 8010. Annular groove; 8011. Ring plate; 8012. Second spring; 8013. Buffer plate; 8014. Guide hole; 8015. Retaining ring; 8016. Guide groove; 9. Chassis. DETAILED DESCRIPTION

[0031] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0032] Reference Figures 1-10 , a hydraulic station assembly, including a chassis 9, and also including: The motor pump unit 2 is arranged inside the chassis 9, and an oil tank 3 for supplying oil to the hydraulic station assembly is provided on one side of the chassis 9; A booster oil cylinder 1 for boosting the oil circuit, comprising a first cylinder body 101, a first piston cylinder 102, a second piston cylinder 103, a second cylinder body 104, and a third cylinder body 105. The first cylinder body 101, the first piston cylinder 102, the second piston cylinder 103, the second cylinder body 104, and the third cylinder body 105 are all fixedly connected by bolts. A large piston 1014 is provided inside the first cylinder body 101, and a small piston 1013 is provided inside the third cylinder body 105; A buffer assembly 8 for protecting the large piston 1014 and the small piston 1013; The main circuit return oil filter 4 and the circulating return oil filter 5 are used to filter and remove impurities from the hydraulic oil in the oil circuit, and the circulating pump unit 7 is used to realize the circulation transmission of the hydraulic oil inside the main circuit return oil filter 4 and the circulating return oil filter 5; A cooler 6 is used to cool the hydraulic oil.

[0033] In order to ensure the connectivity between the boost cylinder 1 and the external oil circuit, refer to Figure 3 、 Figure 4 , both ends of the first cylinder body 101 are provided with a first cylinder head 106, one first cylinder head 106 is fixedly connected to the first piston cylinder 102, one end of the other first cylinder head 106 is fixedly connected to the first sealing cover 108 by bolts, and the circumferential outer wall of the first sealing cover 108 is provided with an oil inlet pipe 1012, and both ends of the third cylinder body 105 are provided with a second cylinder head 107, one second cylinder head 107 is fixedly connected to the second piston cylinder 103, one end of the other second cylinder head 107 is fixedly connected to the second sealing cover 1010 by bolts, and the circumferential outer wall of the second sealing cover 1010 is provided with an oil outlet pipe 1011, and the modular connection of the various components of the booster cylinder 1 is realized by the first cylinder head 106 and the second cylinder head 107, and the bolt fixing method (such as the first sealing cover 108 and the first cylinder head 106) is fixedly connected to the first piston cylinder 103. The oil inlet pipe 1012 and the oil outlet pipe 1011 are connected to the oil circuit through the first sealing cover 108 and the second sealing cover 1010 respectively, forming the input and output channels of the hydraulic oil, ensuring the connectivity between the booster cylinder 1 and the external oil circuit.

[0034] In order to ensure the sealing performance of the boost cylinder 1 and avoid the decrease of boost efficiency due to oil leakage, refer to Figure 4 、 Figure 5 The outer circumferential walls of the large piston 1014 and the small piston 1013 are both provided with an annular sealing groove, and the inside of the annular sealing groove is clamped with a sealing ring 1015. The sealing ring 1015 is clamped in the annular sealing grooves of the outer walls of the large piston 1014 and the small piston 1013, and the elastic deformation of the sealing ring 1015 is used to fill the gap between the piston and the cylinder body to prevent hydraulic oil leakage, ensure the sealing performance of the boost cylinder 1, and avoid the reduction of boosting efficiency due to oil leakage.

[0035] In order to ensure that the buffering action of the buffer assembly 8 is stable and reliable, refer to Figure 5 、 Figure 6The circumferential inner wall of the second cylinder body 104 is fixedly connected with a buffer seat 801. The cross-section of the buffer seat 801 is convex-shaped. A through-type guide hole 8014 is opened in the middle of the buffer seat 801. The movable column 109 passes through the inside of the guide hole 8014. The circumferential outer wall of the guide hole 8014 fits with the circumferential inner wall of the movable column 109. The buffer seat 801 is fixed to the inner wall of the second cylinder body 104 through the convex-shaped structure. Its guide hole 8014 fits and slides with the movable column 109, providing precise guidance for the movable column 109 to avoid offset when the large piston 1014 and the small piston 1013 are linked.

[0036] In order to achieve effective buffering of the internal components of the cylinder, refer to Figure 7 、 Figure 8 The buffer assembly 8 includes an annular groove 8010 opened on the outer wall of one side of the buffer seat 801, and a second spring 8012 is provided on the inner wall of one side of the annular groove 8010. The end of the second spring 8012 away from the inner wall of the annular groove 8010 is fixedly connected to a buffer plate 8013, and the circumferential outer wall of the buffer plate 8013 contacts the circumferential inner wall of the second cylinder body 104. The buffer plate 8013 is connected to the annular groove 8010 of the buffer seat 801 through the second spring 8012. When the movable column 109 moves rapidly due to oil pressure impact, the buffer plate 8013 can absorb the impact force by compressing the second spring 8012. At the same time, the outer wall of the buffer plate 8013 fits into the inner wall of the second cylinder body 104 to form a sealed buffer space, thereby enhancing the buffering effect.

[0037] In order to avoid oil pressure shock and damage to components, a dynamic pressure relief buffer mechanism is formed. Figure 9 、 Figure 10 One end of the buffer seat 801 is provided with an installation groove 806 and a guide groove 8016 that are equidistant and circularly distributed. The installation groove 806 is connected to the guide groove 8016, and the guide groove 8016 and the installation groove 806 pass through the buffer seat 801. A first spring 807 is fixedly connected to the inner wall of one side of the installation groove 806. An end of the first spring 807 away from the inner wall of the installation groove 806 is fixedly connected to a sealing plate 805 for sealing the installation groove 806 and the guide groove 8016. The installation groove 806 and the guide groove 8016 are circumferentially distributed at one end of the buffer seat 801. The first spring 807 pushes the sealing plate 805 to seal the connecting port between the two. When the oil pressure in the guide groove 8016 suddenly rises, the high-pressure oil can push the sealing plate 805 to compress the first spring 807, open the connecting port and release the pressure.

[0038] In order to ensure that the sealing plate 805 slides smoothly along a straight line during the pressure relief process and avoid seal failure due to deviation, refer to Figure 9The middle part of the sealing plate 805 is fixedly connected with a guide column 803, and the circumferential inner wall of the guide groove 8016 is slidably connected with a slip ring 808. The slip ring 808 is fixedly connected to the guide column 803. The guide column 803 is fixed in the middle part of the sealing plate 805, and the slip ring 808 on its outer wall slides with the inner wall of the guide groove 8016 to provide guidance for the movement of the sealing plate 805.

[0039] In order to further stabilize the sliding track of the sealing plate 805, refer to Figure 10 One end of the buffer seat 801 is fixedly connected to a limiting cap 802 that is equidistant and distributed in a circle. The movement of the sealing plate 805 is limited by the limiting cap 802. One end of the guide column 803 passes through the middle of the limiting cap 802. The limiting cap 802 is fixed to one end of the buffer seat 801 to limit the movement stroke of the sealing plate 805 and prevent it from over-compressing the first spring 807 and causing the sealing plate 805 to detach from the mounting groove 806. At the same time, the guide column 803 passes through the middle of the limiting cap 802 to further stabilize the sliding trajectory of the sealing plate 805.

[0040] In order to ensure the synchronous buffering effect of the buffer component 8, refer to Figure 10 A circular rod 804 is provided at one end of the buffer seat 801, and the circular rod 804 is fixedly connected to the guide columns 803 distributed in a circle at equal distances. The circular rod 804 forms an overall supporting structure by fixing the ends of multiple guide columns 803, thereby enhancing the stability of the guide columns 803 and preventing multiple sets of sealing plates 805 from deflecting due to uneven force during operation, thereby ensuring the synchronous buffering effect of the buffer assembly 8.

[0041] In order to prevent the ring plate 8011 from being separated from the annular groove 8010, a double buffer mechanism of hydraulic pressure and spring is formed. Figure 7 、 Figure 9 A guide groove 809 is provided inside the buffer seat 801, and the two ends of the guide groove 809 are respectively connected to the guide groove 8016 and the annular groove 8010, and a ring plate 8011 is slidably connected to the inside of the annular groove 8010, and the ring plate 8011 is fixedly connected to the second spring 8012. One end of the buffer seat 801 is fixedly connected to a retaining ring 8015 for limiting the movement of the ring plate 8011. The guide groove 809 connects the guide groove 8016 and the annular groove 8010. When the oil pressure in the guide groove 8016 increases, the oil flows into the annular groove 8010 through the guide groove 809, pushing the ring plate 8011 to compress the second spring 8012. The ring plate 8011 and the buffer plate 8013 cooperate for buffering. At the same time, the retaining ring 8015 limits the movement range of the ring plate 8011 to prevent it from leaving the annular groove 8010, forming a dual buffering mechanism of hydraulic pressure and spring.

[0042] Working principle: The oil tank 3 provides hydraulic oil for the system. After the motor pump group 2 is started, the oil is pumped from the oil tank 3 and delivered to the oil circuit. The hydraulic oil enters the first cylinder 101 through the oil inlet pipe 1012, pushing the internal large piston 1014 to move. The large piston 1014 is linked with the small piston 1013 through the movable column 109. The movable column 109 slides and guides in the guide hole 8014 of the buffer seat 801. The area difference between the large piston 1014 and the small piston 1013 produces a supercharging effect. The pressurized hydraulic oil is output from the oil outlet pipe 1011 of the third cylinder 105. When the oil pressure in the booster cylinder 1 is too high and the movable column 109 moves faster, the movable column 109 slides at a high speed in the guide hole 8014 of the buffer seat 801, and its end will first contact the buffer plate 8013. At this time, the buffer plate 8013 is subjected to the impact force, compressing the second spring 8012 in the annular groove 8010, so that the second spring 8012 gradually extends out of the annular groove 8010. In this process, the hydraulic oil flows from the guide groove 809 inside the buffer seat 801 into the annular groove 8010 from the guide groove 8016, pushing the ring plate 8011 to slide in the annular groove 8010. The ring plate 8011 and the second spring 8012 work together to further enhance the buffering force. At the same time, the rapid movement of the movable column 109 will cause the oil pressure in the guide groove 8016 to rise sharply, and the high-pressure oil pushes the sealing plate 805 to compress the first spring 807 in the mounting groove 806, so that the sealing plate 805 moves along the guide column 803 to the mounting groove 80 6, the slip ring 808 slides synchronously in the guide groove 8016. At this time, the communication port between the guide groove 8016 and the mounting groove 806 is gradually opened, and part of the high-pressure oil overflows through the mounting groove 806, alleviating the pressure peak in the guide groove 8016, and the limit cap 802 limits the movable stroke of the sealing plate 805 to prevent it from excessive movement and causing seal failure. The circular ring rod 804 ensures the stability of the sliding trajectory of the sealing plate 805 by fixing the position of the guide column 803. When the impact force weakens, the second spring 8012 and the first spring 807 are reset respectively, pushing the buffer plate 8013 and the sealing plate 805 back to the initial position. The ring plate 8011 is reset synchronously under the action of the hydraulic oil reflux, so that the buffer assembly 8 returns to the standby state, thereby realizing dynamic buffering protection for the large piston 1014 and the small piston 1013 in this cycle, avoiding the violent impact of the piston caused by oil pressure fluctuation, and ensuring the stable operation of the booster cylinder 1; At the same time, during the operation of the entire hydraulic station, the circulating pump unit 7 drives the hydraulic oil to circulate between the main circuit return oil filter 4 and the circulating return oil filter 5, removing impurities through double filtration, and the cooler 6 performs heat exchange and cooling on the hydraulic oil in the circulation process, ensuring that the system operates stably in a clean and appropriate temperature.

[0043] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A hydraulic station assembly, comprising a chassis (9), characterized in that: Also includes: A motor pump group (2) is arranged inside the chassis (9), and an oil tank (3) for supplying oil to the hydraulic station assembly is provided on one side of the chassis (9); A boosting oil cylinder (1) for boosting the pressure of an oil circuit, the boosting oil cylinder (1) comprising a first cylinder body (101), a first piston cylinder (102), a second piston cylinder (103), a second cylinder body (104) and a third cylinder body (105), wherein the first cylinder body (101), the first piston cylinder (102), the second piston cylinder (103), the second cylinder body (104) and the third cylinder body (105) are all fixedly connected by bolts, a large piston (1014) is provided inside the first cylinder body (101), and a small piston (1013) is provided inside the third cylinder body (105); a buffer assembly (8) for protecting the large piston (1014) and the small piston (1013); A main circuit return oil filter (4) and a circulating return oil filter (5) for filtering and removing impurities from the hydraulic oil in the oil circuit, wherein the circulating transmission of the hydraulic oil inside the main circuit return oil filter (4) and the circulating return oil filter (5) is achieved through a circulating pump unit (7); A cooler (6) for cooling the hydraulic oil.

2. A hydraulic station assembly according to claim 1, characterized in that: Both ends of the first cylinder body (101) are provided with a first cylinder head (106), one first cylinder head (106) is fixedly connected to the first piston cylinder (102), one end of the other first cylinder head (106) is fixedly connected to the first sealing cover (108) by bolts, and the circumferential outer wall of the first sealing cover (108) is provided with an oil inlet pipe (1012), and both ends of the third cylinder body (105) are provided with a second cylinder head (107), one second cylinder head (107) is fixedly connected to the second piston cylinder (103), one end of the other second cylinder head (107) is fixedly connected to the second sealing cover (1010) by bolts, and the circumferential outer wall of the second sealing cover (1010) is provided with an oil outlet pipe (1011).

3. A hydraulic station assembly according to claim 2, characterized in that: An annular sealing groove is provided on the circumferential outer walls of the large piston (1014) and the small piston (1013), and a sealing ring (1015) is clamped inside the annular sealing groove.

4. A hydraulic station assembly according to claim 3, characterized in that: A buffer seat (801) is fixedly connected to the circumferential inner wall of the second cylinder body (104), the cross section of the buffer seat (801) is convex-shaped, a through-type guide hole (8014) is opened in the middle of the buffer seat (801), a movable column (109) is passed through the inside of the guide hole (8014), and the circumferential outer wall of the guide hole (8014) is in contact with the circumferential inner wall of the movable column (109).

5. The hydraulic station assembly according to claim 4, characterized in that: The buffer assembly (8) includes an annular groove (8010) formed on the outer wall of one side of the buffer seat (801), a second spring (8012) is provided on the inner wall of one side of the annular groove (8010), and an end of the second spring (8012) away from the inner wall of the annular groove (8010) is fixedly connected to a buffer plate (8013), and the circumferential outer wall of the buffer plate (8013) is in contact with the circumferential inner wall of the second cylinder (104).

6. The hydraulic station assembly according to claim 5, characterized in that: One end of the buffer seat (801) is provided with a mounting groove (806) and a guide groove (8016) which are equidistantly distributed in a circular shape. The mounting groove (806) is connected to the guide groove (8016). The guide groove (8016) and the mounting groove (806) pass through the buffer seat (801). A first spring (807) is fixedly connected to an inner wall of one side of the mounting groove (806). An end of the first spring (807) away from the inner wall of the mounting groove (806) is fixedly connected to a sealing plate (805) for sealing the mounting groove (806) and the guide groove (8016).

7. The hydraulic station assembly according to claim 6, characterized in that: A guide column (803) is fixedly connected to the middle of the sealing plate (805), a slip ring (808) is slidably connected to the circumferential inner wall of the guide groove (8016), and the slip ring (808) is fixedly connected to the guide column (803).

8. The hydraulic station assembly according to claim 7, characterized in that: One end of the buffer seat (801) is fixedly connected to a limiting cap (802) distributed in a circular shape at equal distances, and the movement of the sealing plate (805) is limited by the limiting cap (802). One end of the guide column (803) passes through the middle of the limiting cap (802).

9. The hydraulic station assembly according to claim 8, characterized in that: A circular rod (804) is provided at one end of the buffer seat (801), and the circular rod (804) is fixedly connected to guide posts (803) that are distributed in a circular pattern at equal distances.

10. The hydraulic station assembly according to claim 9, characterized in that: A guide groove (809) is provided inside the buffer seat (801), and the two ends of the guide groove (809) are respectively connected to the guide groove (8016) and the annular groove (8010), and a ring plate (8011) is slidably connected inside the annular groove (8010), and the ring plate (8011) is fixedly connected to the second spring (8012). One end of the buffer seat (801) is fixedly connected to a retaining ring (8015) for limiting the movement of the ring plate (8011).

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