A pilot-operated overflow compensation vane cylinder

Abstract

A pilot-operated overflow compensation vane cylinder, the pilot-operated overflow compensation vane cylinder comprising a cylinder block, a spool, a valve sleeve and a swing valve body; the left side of the cylinder block is connected to the right side of a deep groove ball bearing, the side surface of the cylinder block is connected to the right side of a left end cover on the left side of a deep groove ball bearing, the right side of the cylinder block is connected to the left side of a second deep groove ball bearing, the side surface of the cylinder block is connected to the left side of a right end cover on the right side of a second deep groove ball bearing, a stop block is inserted into the top of the cylinder block, a valve sleeve is arranged on the left side of the cylinder block, a spool is arranged inside the valve sleeve, the left end of the spool penetrates through the left end cover and extends to the outside of the left end cover, a swing valve body is installed below the valve sleeve inside the cylinder block, the upper left side of the left end cover is connected to the right end of a low-pressure oil outlet pipe joint, and the right end of the low-pressure oil outlet pipe joint penetrates through the left end cover and communicates with the cylinder block. This design realizes the combination of the overflow and compensation functions of the oil cylinder, making the functions of the hydraulic oil cylinder diversified.

Description

Technical Field

[0001] The present invention relates to an improvement in the technology of hydraulic cylinders, belonging to the field of hydraulic components, and particularly relates to a pilot-operated overflow compensation vane cylinder. Background Art

[0002] As an important support for the manufacturing industry, hydraulic technology has become the core of in-depth implementation of intelligent manufacturing and green manufacturing. Among them, hydraulic cylinders have been widely used in fields such as aerospace, marine equipment, and construction machinery. However, currently, such hydraulic cylinders generally do not have a compensation function, cannot respond to changes in the external physical environment, and cannot meet special working conditions such as ocean wave compensation.

[0003] Compared with motor drive, the main advantages of hydraulic drive are small volume, small inertial force, smooth transmission, and simple operation and control. Hydraulic cylinders usually have high movement efficiency and large energy density, but they also bring some hidden dangers, such as high pressure in pipelines, oil leakage, and overpressure and overload risks. Among them, when the external load fluctuates continuously and greatly, if the inertial impact of the load cannot be effectively offset, it will affect the reliability of the equipment itself and the entire hydraulic system. In severe cases, major safety accidents may occur. Currently, the common compensation cylinders are mostly direct-acting piston cylinders, which cooperate with pulley groups to achieve wave compensation and can achieve relatively accurate positioning in terms of position compensation. However, such cylinders are very large in volume and require a series of external pulley groups, occupying a large amount of space and unable to combine the compensation and overflow functions.

[0004] Chinese Patent Application with the application number CN202020920199.0 and the application date of May 27, 2020, discloses an integrated multi-stage pressure regulating pilot overflow valve, including a main valve body and a pilot valve body fixed on the main valve body. A first cavity is opened in the main valve body. An oil outlet communicating with the first cavity is opened on one side of the first cavity. A main spool is installed in the first cavity. The main spool divides the first cavity into an upper oil cavity and a lower oil cavity. A main valve spring is fixedly installed in the upper oil cavity, and the main spool is connected to the main valve spring. A first damping hole is opened in the center of the main spool, and the upper oil cavity and the lower oil cavity are communicated through the first damping hole. The overflow valve integrates three pressure regulating mechanisms into one body, can achieve multi-stage pressure regulation, has a large pressure regulation range, and can meet the pressure requirements of hydraulic equipment under different working conditions (such as the forward working, fast forward, and fast reverse of the cylinder). However, the comparative document does not solve the problem that the existing cylinder compensation and overflow functions cannot be combined.

[0005] Disclosing the information of this background art section is only intended to increase the understanding of the overall background of this patent application, and should not be regarded as an admission or any form of implication that this information constitutes the prior art already known to those of ordinary skill in the art. Summary of the Invention

[0006] The object of the present invention is to overcome the problem in the prior art that the functions of oil cylinder compensation and overflow cannot be combined, and a pilot-operated overflow compensation vane cylinder combining the functions of oil cylinder compensation and overflow is provided.

[0007] To achieve the above object, the technical solution of the present invention is: a pilot-operated overflow compensation vane cylinder, which includes a cylinder block, a spool, a valve sleeve and a swing valve body;

[0008] The left side of the cylinder block is connected to the right side of a deep groove ball bearing, the side of the cylinder block is connected to the right side of the left end cover on the left side of a deep groove ball bearing, the right side of the cylinder block is connected to the left side of two deep groove ball bearings, the side of the cylinder block is connected to the left side of the right end cover on the right side of two deep groove ball bearings, a stopper is inserted into the top of the cylinder block, a valve sleeve is arranged on the left side of the cylinder block, a spool is arranged inside the valve sleeve, the left end of the spool penetrates through the left end cover and extends to the outside of the left end cover, a swing valve body is installed below the valve sleeve inside the cylinder block, the upper left side of the left end cover is connected to the right end of a low-pressure oil outlet pipe joint, the right end of the low-pressure oil outlet pipe joint penetrates through the left end cover and communicates with the cylinder block, the lower left side of the left end cover is connected to the right end of a high-pressure oil inlet pipe joint, a pilot spool is arranged at the right end of the spool inside the cylinder block, a pressure regulating screw is connected to the cylinder block corresponding to the pilot spool, and a pilot spring is connected between the bottom of the pressure regulating screw and the inner wall of the pilot spool. A main spool is arranged below the pilot spool inside the cylinder block, a plug is arranged on the front of the cylinder block corresponding to the main spool, and a main spring is connected between one end of the plug and the inner wall of the main spool.

[0009] The cylinder block includes a main cylinder block and an overflow valve body. A bearing cavity is opened at the left end of the main cylinder block, a deep groove ball bearing is arranged in the bearing cavity, two bearing cavities are opened at the right end of the main cylinder block, and two deep groove ball bearings are arranged in the two bearing cavities. A swing cavity communicating with the bearing cavity is opened at the left end of the main cylinder block, a valve sleeve is arranged in the swing cavity, a stopper socket is opened at the top of the main cylinder block, a stopper is inserted into the stopper socket, a cylinder block low-pressure oil circuit is arranged at the upper left side of the main cylinder block, and the low-pressure oil outlet pipe joint, the cylinder block low-pressure oil circuit and the swing cavity are communicated with each other. A cylinder block high-pressure oil circuit is arranged at the lower left side of the main cylinder block, and the high-pressure oil inlet pipe joint, the cylinder block high-pressure oil circuit and the swing cavity are communicated with each other;

[0010] The rear side of the main cylinder block is connected to the front side of the overflow valve body. A pilot cavity is opened at the top of the overflow valve body, and the pressure regulating screw, the pilot spring and the pilot spool are arranged in the pilot cavity. An overflow valve body main cavity is opened on the front of the main cylinder block, and the main spool and the main spring are arranged in the overflow valve body main cavity. The pilot cavity and the overflow valve body main cavity are connected through a pilot flow channel. The overflow valve body main cavity is communicated with an overflow valve body high-pressure oil inlet flow channel, the overflow valve body high-pressure oil inlet flow channel is connected to the cylinder block high-pressure oil circuit, the overflow valve body main cavity is communicated with a main overflow flow channel, the main overflow flow channel is connected to the cylinder block low-pressure oil circuit, and the pilot cavity and the main overflow flow channel are connected through a pilot overflow flow channel.

[0011] The stop block includes a pressing and sealing block and an insertion block. The bottom of the pressing and sealing block is connected to the top of the insertion block. The pressing and sealing block is pressed against the stop block jack through a pressure regulating screw, and the insertion block is arranged in the stop block jack.

[0012] The length of the insertion block is the same as that of the stop block jack. The top end of the insertion block is an arc concave surface, and the arc angle of the arc concave surface is 15 to 20 degrees.

[0013] The swing valve body includes a swing valve body main body, a swing valve body oil-passing valve body, a swing valve body bearing boss, and a swing valve body output shaft. One end of the swing valve body main body is connected to one end of the oil-passing valve body. The other end of the oil-passing valve body is connected to one end of the bearing boss. The other end of the bearing boss is connected to one end of the swing valve body output shaft. An oil distribution cavity of the main valve body is arranged on the side surface of the swing valve body main body. The valve sleeve is arranged in the valve body oil distribution cavity. An oil outlet of the first valve body, an oil outlet of the second valve body, an oil inlet of the first valve body, and an oil inlet of the second valve body are sequentially arranged on the top of the swing valve body main body. The oil outlet of the first valve body, the oil outlet of the second valve body, the oil inlet of the first valve body, and the oil inlet of the second valve body are all communicated with the valve body oil distribution cavity. An annular oil inlet groove and an annular oil outlet groove are arranged on the oil-passing valve body. The annular oil inlet groove is communicated with the high-pressure oil circuit of the cylinder block, and the annular oil outlet groove is communicated with the low-pressure oil circuit of the cylinder block.

[0014] A symmetrically arranged first valve body oil inlet flow channel and a second valve body oil inlet flow channel are arranged in the swing valve body main body. The two first valve body oil inlet flow channels and the two second valve body oil inlet flow channels are all communicated with the annular oil outlet groove. The other end of the swing valve body main body is connected to a deep groove ball bearing, and the other end of the swing valve body output shaft is connected to a deep groove ball bearing.

[0015] The valve sleeve includes a sleeve body, a high-pressure annular oil groove of the valve sleeve, and a low-pressure annular oil groove of the valve sleeve. The high-pressure annular oil groove of the valve sleeve and the low-pressure annular oil groove of the valve sleeve are arranged on the side circumference of the sleeve body. The high-pressure annular oil groove of the valve sleeve and the low-pressure annular oil groove of the valve sleeve are respectively communicated with the valve core. A valve core cavity of the valve sleeve is arranged on the side surface of the sleeve body. A first oil outlet of the valve sleeve is arranged on the left side of the high-pressure annular oil groove of the valve sleeve on the side circumference of the sleeve body. A second oil outlet of the valve sleeve and a second oil inlet of the valve sleeve are arranged between the high-pressure annular oil groove of the valve sleeve and the low-pressure annular oil groove of the valve sleeve on the side circumference of the sleeve body. A first oil inlet of the valve sleeve is arranged on the right side of the low-pressure annular oil groove of the valve sleeve on the side circumference of the sleeve body. The first oil outlet of the valve sleeve is communicated with the oil outlet of the first valve body. The second oil outlet of the valve sleeve is communicated with the oil outlet of the second valve body. The first oil inlet of the valve sleeve is communicated with the oil inlet of the first valve body. The second oil inlet of the valve sleeve is communicated with the oil inlet of the second valve body.

[0016] On the side circumference of the sleeve body, two symmetrically arranged valve sleeve oil inlet rectangular openings are provided in the high-pressure annular oil groove of the valve sleeve. Both of the two valve sleeve oil inlet rectangular openings are communicated with the valve core. On the side circumference of the sleeve body, two symmetrically arranged valve sleeve oil outlet rectangular openings are provided in the low-pressure annular oil groove of the valve sleeve. Both of the two valve sleeve oil outlet rectangular openings are communicated with the valve core.

[0017] The valve core includes a valve core input rod and a valve core oil distribution rod. The right end of the valve core input rod is connected to the left end of the valve core oil distribution rod. On the valve core oil distribution rod, a valve core counterclockwise oil inlet groove, a valve core high-pressure oil inlet and distribution boss, a valve core clockwise oil inlet groove, a valve core counterclockwise oil outlet groove, a valve core low-pressure oil outlet and distribution boss, and a valve core clockwise oil outlet groove are sequentially provided. The valve core low-pressure oil outlet and distribution boss are respectively communicated with the valve sleeve oil inlet rectangular opening and the valve sleeve oil outlet rectangular opening.

[0018] The width of the oil distribution surface of the high-pressure oil inlet and distribution boss is the same as the width of the valve sleeve oil inlet rectangular opening. The valve core clockwise oil inlet groove and the valve core counterclockwise oil outlet groove are not communicated with the valve sleeve high-pressure annular oil groove. The width of the valve core low-pressure oil outlet and distribution boss is the same as the width of the valve sleeve oil outlet rectangular opening. The valve core clockwise oil inlet groove and the valve core counterclockwise oil outlet groove are not communicated with the valve sleeve low-pressure annular oil groove.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. In a pilot-operated overflow compensation vane cylinder of the present invention, a pilot valve core is arranged at the right end of the valve core inside the cylinder block. At the position corresponding to the pilot valve core on the top of the cylinder block, it is connected to a pressure regulating screw. Between the bottom of the pressure regulating screw and the inner wall of the pilot valve core, it is connected by a pilot spring. Inside the cylinder block, a main valve core is arranged below the pilot valve core. At the position corresponding to the main valve core on the front surface of the cylinder block, a plug is arranged. Between one end of the plug and the inner wall of the main valve core, it is connected by a main spring. The main valve core is used to control the opening and closing of the main valve port, and a damping hole is opened on it. The main spring is used to support the main valve core. The pilot valve core is used to control the opening and closing of the pilot valve port. The pilot spring is used to support the pilot valve core. The pressure regulating screw is used to control the opening pressure of the pilot valve core. When the inlet oil pressure of the pilot-operated overflow valve reaches the value to open the pilot valve core, the high-pressure oil flows through the pilot valve to the low-pressure oil passage. At this time, a pressure difference is generated between the upper and lower parts of the main valve core, and the main valve core opens, and the overflow valve realizes overflow. The high-pressure oil pipe joint is always connected to high-pressure oil, and the low-pressure oil pipe joint always discharges low-pressure oil. The vane cylinder can realize commutation following the rotation of the valve core. When using a motor to control the position of the valve core, the compensation function of the vane cylinder can be realized. The vane cylinder and the overflow valve are integrated, combining the hydraulic servo technology and the pilot technology to realize the combination of the overflow and compensation functions of the oil cylinder, making the functions of the hydraulic cylinder diversified. Therefore, this design combines the compensation and overflow functions, with diversified functions.

[0021] 2. In a pilot-operated overflow compensation vane cylinder of the present invention, an overflow valve body main chamber is provided on the front surface of the cylinder block. The main spool and the main spring are arranged in the overflow valve body main chamber. The pilot chamber is connected to the overflow valve body main chamber through a pilot flow channel. The overflow valve body main chamber is connected to the high-pressure oil inlet flow channel of the overflow valve body. The high-pressure oil inlet flow channel of the overflow valve body is connected to the high-pressure oil circuit of the cylinder block. The overflow valve body main chamber is connected to the main overflow flow channel. The main overflow flow channel is connected to the low-pressure oil circuit of the cylinder block. The pilot chamber is connected to the main overflow flow channel through a pilot overflow flow channel. The high-pressure oil channel and the low-pressure oil channel are directly connected to the inlet and outlet of the pilot-operated overflow valve respectively, saving the flow time of the path from the vane cylinder to the pilot-operated overflow valve and improving the reaction speed. Therefore, this design improves the reaction speed and has stable connection.

[0022] 3. In a pilot-operated overflow compensation vane cylinder of the present invention, when the pressure of the internal hydraulic system of the vane cylinder is lower than the set overflow pressure, the pilot-operated overflow valve does not overflow. The high-pressure oil enters the overflow valve body main chamber through the high-pressure oil inlet flow channel of the overflow valve body and the damping hole on the main spool. The upper and lower pressures of the main spool are equal, but since the force-bearing area at the upper end is larger than that at the lower end, the main spool does not move under the action of the resultant force, and the overflow valve is ineffective. The safety protection function of the overflow valve is fully utilized, enabling the vane cylinder to have a self-adjusting mechanism for the pressure of the hydraulic system, and the pressure of the overflow valve is adjustable. Therefore, this design has adjustable pressure and is safe to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of the present invention.

[0024] Figure 2 is a sectional view of the present invention.

[0025] Figure 3 is a side sectional view of the cylinder block in the present invention.

[0026] Figure 4 is a schematic structural diagram of the cylinder block in the present invention.

[0027] Figure 5 is a schematic diagram of the flow of the pilot chamber of the overflow valve body in the present invention.

[0028] Figure 6 is a schematic structural diagram of the spool in the present invention.

[0029] Figure 7 is a schematic structural diagram of the valve sleeve in the present invention.

[0030] Figure 8 is a schematic structural diagram of the swing valve body in the present invention.

[0031] In the figure: low-pressure oil outlet pipe joint 1, left end cover 2, a deep groove ball bearing 3, stop block 4, the stop block 41 includes a pressing and sealing block 41, an insertion block 42, an arc concave surface 43, cylinder block 5, main cylinder block 51, overflow valve body 52, a bearing cavity 501, a second bearing cavity 5011, a 502 swing cavity, a 503 stop block jack, a 504 cylinder block low-pressure oil circuit, a 505 cylinder block high-pressure oil circuit, a 506 overflow valve body main cavity, a 507 main overflow channel, a 508 overflow valve body high-pressure oil inlet channel, a 509 overflow valve body pilot cavity, a 510 pilot overflow channel, a 511 pilot channel, right end cover 6, high-pressure oil inlet pipe joint 7, valve core 8, valve core input rod 801, valve core oil distribution rod 802, valve core counterclockwise oil inlet groove 803, valve core high-pressure oil inlet oil distribution boss 804, valve core clockwise oil inlet groove 805, valve core counterclockwise oil outlet groove 806, valve core low-pressure oil outlet oil distribution boss 807, valve core clockwise oil outlet groove 808, valve sleeve 9, valve sleeve high-pressure annular oil groove 901, valve sleeve oil inlet rectangular port 902, valve sleeve low-pressure annular oil groove 903, valve sleeve oil outlet rectangular port 904, a first valve sleeve oil outlet 905, a second valve sleeve oil outlet 906, a first valve sleeve oil inlet 907, a second valve sleeve oil inlet 908, valve sleeve valve core cavity 909, swing valve body 10, swing valve body main valve body 1001, swing valve body oil-passing valve body 1002, swing valve body bearing boss 1003, swing valve body output shaft 1004, vane 1005, swing valve body main valve body oil distribution cavity 1006, a first valve body oil outlet 1007, a second valve body oil outlet 1008, a first valve body oil inlet 1009, a second valve body oil inlet 1010, valve body annular oil inlet groove 1011, valve body annular oil outlet groove 1012, a first valve body oil inlet channel 1013, a second valve body oil outlet channel 1014, two deep groove ball bearings 11, pressure regulating screw 12, pilot spring 13, plug 14, pilot valve core 15, main spring 16, main valve core 17. Detailed implementation mode

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation modes.

[0033] See Figures 1 to 8 , a pilot-operated overflow compensation vane cylinder, the pilot-operated overflow compensation vane cylinder includes a cylinder block 5, a valve core 8, a valve sleeve 9 and a swing valve body 10;

[0034] The left side of the cylinder block 5 is connected to the right side of a deep groove ball bearing 3. The side surface of the cylinder block 5 is located on the left side of a deep groove ball bearing 3 and is connected to the right side of the left end cover 2. The right side of the cylinder block 5 is connected to the left side of a double-row deep groove ball bearing 11. The side surface of the cylinder block 5 is located on the right side of the double-row deep groove ball bearing 11 and is connected to the left side of the right end cover 6. A stopper 4 is inserted into the top of the cylinder block 5. A valve sleeve 9 is provided on the left side of the cylinder block 5. A valve core 8 is arranged inside the valve sleeve 9. The left end of the valve core 8 penetrates through the left end cover 2 and extends to the outside of the left end cover 2. A swing valve body 10 is installed below the valve sleeve 9 inside the cylinder block 5. The upper left side of the left end cover 2 is connected to the right end of the low-pressure oil outlet pipe joint 1. The right end of the low-pressure oil outlet pipe joint 1 penetrates through the left end cover 2 and communicates with the cylinder block 5. The lower left side of the left end cover 2 is connected to the right end of the high-pressure oil inlet pipe joint 7. A pilot valve core 15 is arranged at the right end of the valve core 8 inside the cylinder block 5. The top of the cylinder block 5 corresponding to the pilot valve core 15 is connected to a pressure regulating screw 12. A pilot spring 13 is connected between the bottom of the pressure regulating screw 12 and the inner wall of the pilot valve core 15. A main valve core 17 is arranged below the pilot valve core 15 inside the cylinder block 5. A plug 14 is arranged on the front surface of the cylinder block 5 corresponding to the main valve core 17. A main spring 16 is connected between one end of the plug 14 and the inner wall of the main valve core 17.

[0035] The cylinder block 5 includes a main cylinder block 51 and an overflow valve body 52. A bearing cavity 501 is formed at the left end of the main cylinder block 51. A deep groove ball bearing 3 is arranged inside the bearing cavity 501. A double-row bearing cavity 5011 is formed at the right end of the main cylinder block 51. A double-row deep groove ball bearing 11 is arranged inside the double-row bearing cavity 5011. A swing cavity 502 communicating with the bearing cavity 501 is formed at the left end of the main cylinder block 51. A valve sleeve 9 is arranged inside the swing cavity 502. A stopper insertion hole 503 is formed at the top of the main cylinder block 51. A stopper 4 is inserted into the stopper insertion hole 503. A low-pressure oil circuit 504 of the cylinder block is arranged at the upper left side of the main cylinder block 51. The low-pressure oil outlet pipe joint 1, the low-pressure oil circuit 504 of the cylinder block and the swing cavity 502 are communicated with each other. A high-pressure oil circuit 505 of the cylinder block is arranged at the lower left side of the main cylinder block 51. The high-pressure oil inlet pipe joint 7, the high-pressure oil circuit 505 of the cylinder block and the swing cavity 502 are communicated with each other.

[0036] The rear side of the main cylinder block 51 is connected to the front side of the overflow valve body 52. A pilot chamber 509 is provided at the top of the overflow valve body 52. The pressure regulating screw 12, the pilot spring 13, and the pilot valve core 15 are arranged in the pilot chamber 509. An overflow valve body main chamber 506 is provided on the front surface of the main cylinder block 51. The main valve core 17 and the main spring 16 are arranged in the overflow valve body main chamber 506. The pilot chamber 509 is communicated with the overflow valve body main chamber 506 through a pilot flow channel 511. The overflow valve body main chamber 506 is communicated with the overflow valve body high-pressure oil inlet flow channel 508. The overflow valve body high-pressure oil inlet flow channel 508 is communicated with the cylinder block high-pressure oil circuit 505. The overflow valve body main chamber 506 is communicated with the main overflow flow channel 507. The main overflow flow channel 507 is communicated with the cylinder block low-pressure oil circuit 504. The pilot chamber 509 is communicated with the main overflow flow channel 507 through a pilot overflow flow channel 510.

[0037] The stopper 41 includes a pressing and sealing block 41 and an inserting block 42. The bottom of the pressing and sealing block 41 is connected to the top of the inserting block 42. The pressing and sealing block 41 is pressed against the stopper jack 503 through the pressure regulating screw 12. The inserting block 42 is arranged in the stopper jack 503.

[0038] The length of the inserting block 42 is the same as that of the stopper jack 503. The top end of the inserting block 42 is an arc concave surface 43, and the arc angle of the arc concave surface 43 is 15 degrees to 20 degrees.

[0039] The swing valve body 10 includes a swing valve body main valve body 1001, a swing valve body oil-passing valve body 1002, a swing valve body bearing boss 1003, and a swing valve body output shaft 1004. One end of the swing valve body main valve body 1001 is connected to one end of the oil-passing valve body 1002. The other end of the oil-passing valve body 1002 is connected to one end of the bearing boss 1003. The other end of the bearing boss 1003 is connected to one end of the swing valve body output shaft 1004. A main valve body oil distribution chamber 1006 is provided on the side surface of the swing valve body main valve body 1001. The valve sleeve 9 is arranged in the valve body oil distribution chamber 1006. An oil outlet 1007 of the first valve body, an oil outlet 1008 of the second valve body, an oil inlet 1009 of the first valve body, and an oil inlet 1010 of the second valve body are successively provided on the top of the swing valve body main valve body 1001. The oil outlet 1007 of the first valve body, the oil outlet 1008 of the second valve body, the oil inlet 1009 of the first valve body, and the oil inlet 1010 of the second valve body are all communicated with the valve body oil distribution chamber 1006. An annular oil inlet groove 1011 and an annular oil outlet groove 1012 are provided on the oil-passing valve body 1002. The annular oil inlet groove 1011 is communicated with the cylinder block high-pressure oil circuit 505. The annular oil outlet groove 1012 is communicated with the cylinder block low-pressure oil circuit 504.

[0040] In the main valve body 1001 of the swinging valve body, a symmetrically arranged first valve body oil inlet passage 1013 and a second valve body oil inlet passage 1014 are provided. The two first valve body oil inlet passages 1013 and the two second valve body oil inlet passages 1014 are both communicated with the annular oil outlet groove 1012. The other end of the main valve body 1001 of the swinging valve body is connected to a deep groove ball bearing 3, and the other end of the output shaft 1004 of the swinging valve body is connected to a second deep groove ball bearing 11.

[0041] The valve sleeve 9 includes a sleeve body 910, a valve sleeve high-pressure annular oil groove 901 and a valve sleeve low-pressure annular oil groove 903. The valve sleeve high-pressure annular oil groove 901 and the valve sleeve low-pressure annular oil groove 903 are provided on the side circumference of the sleeve body 910. The valve sleeve high-pressure annular oil groove 901 and the valve sleeve low-pressure annular oil groove 903 are respectively communicated with the valve core 8. A valve sleeve valve core cavity 909 is provided on the side surface of the sleeve body 910. A first valve sleeve oil outlet 905 is provided on the side circumference of the sleeve body 910 to the left of the valve sleeve high-pressure annular oil groove 901. Second valve sleeve oil outlets 906 and second valve sleeve oil inlets 908 are provided on the side circumference of the sleeve body 910 between the valve sleeve high-pressure annular oil groove 901 and the valve sleeve low-pressure annular oil groove 903. A first valve sleeve oil inlet 907 is provided on the side circumference of the sleeve body 910 to the right of the valve sleeve low-pressure annular oil groove 903. The first valve sleeve oil outlet 905 is communicated with a first valve body oil outlet 1007, the second valve sleeve oil outlets 906 are communicated with a second valve body oil outlet 1008, the first valve sleeve oil inlet 907 is communicated with a first valve body oil inlet 1009, and the second valve sleeve oil inlets 908 are communicated with a second valve body oil inlet 1010.

[0042] On the side circumference of the sleeve body 910, two symmetrically arranged valve sleeve oil inlet rectangular openings 902 are provided in the valve sleeve high-pressure annular oil groove 901, and the two valve sleeve oil inlet rectangular openings 902 are both communicated with the valve core 8. On the side circumference of the sleeve body 910, two symmetrically arranged valve sleeve oil outlet rectangular openings 904 are provided in the valve sleeve low-pressure annular oil groove 903, and the two valve sleeve oil outlet rectangular openings 904 are both communicated with the valve core 8.

[0043] The valve core 8 includes a valve core input rod 801 and a valve core oil distribution rod 802. The right end of the valve core input rod 801 is connected to the left end of the valve core oil distribution rod 802. The valve core oil distribution rod 802 is successively provided with a valve core counterclockwise oil inlet groove 803, a valve core high-pressure oil inlet distribution boss 804, a valve core clockwise oil inlet groove 805, a valve core counterclockwise oil outlet groove 806, a valve core low-pressure oil outlet distribution boss 807 and a valve core clockwise oil outlet groove 808. The valve core low-pressure oil outlet distribution boss 807 is respectively connected to the valve sleeve oil inlet rectangular openings 902 and the valve sleeve oil outlet rectangular openings 904.

[0044] The width of the oil distribution surface of the high-pressure oil inlet oil distribution boss 804 is the same as the width of the oil inlet rectangular port 902 of the valve sleeve. The clockwise oil inlet groove 805 of the valve core and the counterclockwise oil outlet groove 806 of the valve core are not communicated with the high-pressure annular oil groove 901 of the valve sleeve. The width of the low-pressure oil outlet oil distribution boss 807 of the valve core is the same as the width of the oil outlet rectangular port 904 of the valve sleeve. The clockwise oil inlet groove 805 of the valve core and the counterclockwise oil outlet groove 806 of the valve core are not communicated with the low-pressure annular oil groove 903 of the valve sleeve.

[0045] The principle of the present invention is described as follows: The high-pressure oil inlet pipe joint 7 introduces high-pressure oil, which reaches the valve body annular oil inlet groove 1011 through the cylinder block high-pressure oil path 505, and reaches the valve sleeve high-pressure annular oil groove 901 through the valve body oil inlet flow path 1013. The valve core input rod 801 is key-connected to the external control motor, and the motor drives the valve core 8 to rotate counterclockwise. A gap appears between the high-pressure oil inlet oil distribution boss 804 of the valve core and the oil inlet rectangular port 902 of the valve sleeve. The high-pressure oil enters the counterclockwise oil inlet groove 803 of the valve core through the gap. The counterclockwise oil inlet groove 803 of the valve core is communicated with a valve sleeve oil outlet 905. The high-pressure oil enters the left cavity of the valve body through a valve sleeve oil outlet 905 and a valve body oil outlet 1007. At the same time, the low-pressure oil in the right cavity of the swing valve body 10 enters the counterclockwise oil outlet groove 806 of the valve core through the second valve body oil inlet 1010 and the second valve sleeve oil inlet 908, and enters the valve sleeve low-pressure annular oil groove 903 through the gap between the low-pressure oil outlet oil distribution boss 807 of the valve core and the oil outlet rectangular port 904 of the valve sleeve, and then reaches the valve body annular oil outlet groove 1012 through the valve body oil outlet flow path 1014, and then enters the cylinder block low-pressure oil path 504 and is discharged through the low-pressure oil outlet pipe joint 1. The high-pressure oil pushes the vane 1005 to rotate counterclockwise, and the swing valve body 10 and the valve sleeve 9 rotate together in the direction of reducing the gap between the high-pressure oil inlet oil distribution boss 804 of the valve core and the oil inlet rectangular port 902 of the valve sleeve, that is, the swing valve body 10 rotates in the direction of the valve core 8 until the gap between the high-pressure oil inlet oil distribution boss 804 of the valve core and the oil inlet rectangular port 902 of the valve sleeve disappears when the valve core 8 has no input rotation, the oil path is cut off, and the vane cylinder stops rotating. Therefore, the compensation function of the vane cylinder can be realized by controlling the rotation of the valve core 8;

[0046] When the internal hydraulic system pressure of the vane cylinder is lower than the set overflow pressure (the overflow pressure can be set by the pressure regulating screw 12), the pilot-operated overflow valve does not overflow. The high-pressure oil enters the main chamber 506 of the overflow valve body through the high-pressure oil inlet flow path 508 of the overflow valve body and the damping hole on the main valve core 17. The pressures above and below the main valve core 17 are equal, but since the force-bearing area at the upper end is larger than the force-bearing area at the lower end, the main valve core 17 does not move under the action of the resultant force, and the overflow valve is ineffective;

[0047] When the pressure of the internal hydraulic system of the vane cylinder is higher than the set overflow pressure (the overflow pressure can be set by the pressure regulating screw 12), the oil pressure in the main chamber 506 of the overflow valve body continuously increases. The pressure is transmitted to the pilot valve core 15 through the pilot flow channel 511, reaching a state where the pilot valve core 15 is pushed open. The high-pressure oil flows through the pilot overflow flow channel 510 to the main overflow flow channel 507. At this time, the internal pressure of the main chamber 506 of the overflow valve body decreases, creating a pressure difference above and below the main valve core 17. The high-pressure oil in the high-pressure inlet oil flow channel 508 of the overflow valve body pushes the main valve core 17 open, and the high-pressure oil directly drains through the main overflow flow channel 507 from the high-pressure inlet oil flow channel 508 of the overflow valve body, and the overflow valve is effective.

[0048] Embodiment 1:

[0049] A pilot-operated overflow compensation vane cylinder, the pilot-operated overflow compensation vane cylinder includes a cylinder block 5, a valve core 8, a valve sleeve 9 and a swing valve body 10; the left side of the cylinder block 5 is connected to the right side of a deep groove ball bearing 3, the side of the cylinder block 5 is located on the left side of a deep groove ball bearing 3 and connected to the right side of the left end cover 2, the right side of the cylinder block 5 is connected to the left side of a deep groove ball bearing 11, the side of the cylinder block 5 is located on the right side of a deep groove ball bearing 11 and connected to the left side of the right end cover 6, a stopper 4 is inserted into the top of the cylinder block 5, a valve sleeve 9 is arranged on the left side of the cylinder block 5, a valve core 8 is arranged inside the valve sleeve 9, the left end of the valve core 8 penetrates through the left end cover 2 and extends to the outside of the left end cover 2, a swing valve body 10 is installed below the valve sleeve 9 inside the cylinder block 5, the upper left side of the left end cover 2 is connected to the right end of the low-pressure oil outlet pipe joint 1, the right end of the low-pressure oil outlet pipe joint 1 penetrates through the left end cover 2 and communicates with the cylinder block 5, the lower left side of the left end cover 2 is connected to the right end of the high-pressure oil inlet pipe joint 7, a pilot valve core 15 is arranged at the right end of the valve core 8 inside the cylinder block 5, the top of the cylinder block 5 corresponding to the pilot valve core 15 is connected to the pressure regulating screw 12, and the bottom of the pressure regulating screw 12 and the inner wall of the pilot valve core 15 are connected by a pilot spring 13. A main valve core 17 is arranged below the pilot valve core 15 inside the cylinder block 5, a plug 14 is arranged on the front surface of the cylinder block 5 corresponding to the main valve core 17, and one end of the plug 14 and the inner wall of the main valve core 17 are connected by a main spring 16; when the pressure of the internal hydraulic system of the vane cylinder is lower than the set overflow pressure (the overflow pressure can be set by the pressure regulating screw 12), the pilot-operated overflow valve does not overflow, and the high-pressure oil enters the main chamber 506 of the overflow valve body through the high-pressure inlet oil flow channel 508 of the overflow valve body and the damping hole on the main valve core 17. The pressures above and below the main valve core 17 are equal, but since the force-receiving area at the upper end is larger than that at the lower end, the main valve core 17 does not move under the action of the resultant force, and the overflow valve is ineffective.

[0050] During application: High-pressure oil enters through the high-pressure oil pipe joint 7. The motor drives the valve core 8 to rotate counterclockwise, and the high-pressure oil enters the left cavity of the swing valve body 1. At the same time, the low-pressure oil in the right cavity of the swing valve body 10 is discharged through the low-pressure oil pipe joint 1. The swing valve body 10 and the valve sleeve 9 rotate together towards the cylinder block 5, that is, the swing valve body 10 rotates following the direction of the valve core 8. Until there is no input rotation for the valve core 8, the gap between the valve core 8 and the valve sleeve 9 disappears, the oil circuit is cut off, and the vane cylinder stops rotating. Therefore, the compensation function of the vane cylinder can be achieved by controlling the rotation of the valve core 8.

[0051] Embodiment 2:

[0052] Embodiment 2 is basically the same as Embodiment 1, and the difference lies in:

[0053] A pilot-operated overflow compensation vane cylinder, wherein the cylinder block 5 comprises a main cylinder block 51 and an overflow valve body 52. A bearing cavity 501 is formed at the left end of the main cylinder block 51, and a deep groove ball bearing 3 is arranged in the bearing cavity 501. Two bearing cavities 5011 are formed at the right end of the main cylinder block 51, and two deep groove ball bearings 11 are arranged in the two bearing cavities 5011. A swing cavity 502 communicating with the bearing cavity 501 is formed at the left end of the main cylinder block 51, and a valve sleeve 9 is arranged in the swing cavity 502. A stop block insertion hole 503 is formed at the top of the main cylinder block 51, and a stop block 4 is inserted into the stop block insertion hole 503. A rectangular sealing groove is formed around the stop block insertion hole 503 for installing a rectangular sealing ring to prevent leakage of the stop block insertion hole 503. A low-pressure oil passage 504 of the cylinder block is arranged at the upper left side of the main cylinder block 51, and a low-pressure oil outlet pipe joint 1, the low-pressure oil passage 504 of the cylinder block and the swing cavity 502 are communicated with each other. A high-pressure oil passage 505 of the cylinder block is arranged at the lower left side of the main cylinder block 51, and a high-pressure oil inlet pipe joint 7, the high-pressure oil passage 505 of the cylinder block and the swing cavity 502 are communicated with each other. The rear side of the main cylinder block 51 is connected to the front side of the overflow valve body 52. A pilot cavity 509 is formed at the top of the overflow valve body 52, and a pressure regulating screw 12, a pilot spring 13 and a pilot valve core 15 are arranged in the pilot cavity 509. A main cavity 506 of the overflow valve body is formed at the front of the main cylinder block 51, and a main valve core 17 and a main spring 16 are arranged in the main cavity 506 of the overflow valve body. The pilot cavity 509 and the main cavity 506 of the overflow valve body are communicated with each other through a pilot flow passage 511. The main cavity 506 of the overflow valve body is communicated with a high-pressure oil inlet flow passage 508 of the overflow valve body. The high-pressure oil inlet flow passage 508 of the overflow valve body is connected to the high-pressure oil passage 505 of the cylinder block. The main cavity 506 of the overflow valve body is communicated with a main overflow flow passage 507. The main overflow flow passage 507 is connected to the low-pressure oil passage 504 of the cylinder block. The pilot cavity 509 and the main overflow flow passage 507 are communicated with each other through a pilot overflow flow passage 510. When the pressure of the internal hydraulic system of the vane cylinder is higher than the set overflow pressure (the overflow pressure can be set by the pressure regulating screw 12), the oil pressure in the main cavity 506 of the overflow valve body continuously increases, and the pressure is transmitted to the pilot valve core 15 through the pilot flow passage 511, so as to push and open the pilot valve core 15. The high-pressure oil flows to the main overflow flow passage 507 through the pilot overflow flow passage 510. At this time, the internal pressure of the main cavity 506 of the overflow valve body decreases, and a pressure difference is generated between the upper and lower parts of the main valve core 17. The high-pressure oil in the high-pressure oil inlet flow passage 508 of the overflow valve body pushes and opens the main valve core 17, and the high-pressure oil directly discharges oil through the main overflow flow passage 507 from the high-pressure oil inlet flow passage 508 of the overflow valve body, and the overflow valve is effective;The overflow valve body 52 is integrated in the cylinder block 5 of the vane cylinder, and includes a main spool 17, a main spring 16, a pilot spool 15, a pilot spring 13 and a pressure regulating screw 12. The main spool 17 is used to control the opening and closing of the main valve port, and there is a damping hole on it. The main spring 16 is used to support the main spool 17. The pilot spool 15 is used to control the opening and closing of the pilot valve port. The pilot spring 13 is used to support the pilot spool 15. The pressure regulating screw 12 is used to control the opening pressure of the pilot spool 15. When the inlet oil pressure of the pilot-operated overflow valve reaches the value to open the pilot spool 15, the high-pressure oil flows through the pilot spool 15 to the low-pressure oil passage. At this time, there is a pressure difference above and below the main spool 17, and the main spool 17 opens, and the overflow valve realizes overflow. The stop block 41 includes a pressing seal block 41 and an insertion block 42. The bottom of the pressing seal block 41 is connected to the top of the insertion block 42. The pressing seal block 41 is pressed against the stop block jack 503 through the pressure regulating screw 12. The insertion block 42 is arranged in the stop block jack 503. The length of the insertion block 42 is the same as the length of the stop block jack 503. The top end of the insertion block 42 is an arc concave surface 43, and the arc angle of the arc concave surface 43 is from 15 degrees to 20 degrees.

[0054] Embodiment 3:

[0055] Embodiment 3 is basically the same as Embodiment 1, and the difference is as follows:

[0056] A pilot-operated overflow compensation vane cylinder. The swing valve body 10 includes a swing valve body main body 1001, a swing valve body oil-passing valve body 1002, a swing valve body bearing boss 1003 and a swing valve body output shaft 1004. One end of the swing valve body main body 1001 is connected to one end of the oil-passing valve body 1002. The other end of the oil-passing valve body 1002 is connected to one end of the bearing boss 1003. The other end of the bearing boss 1003 is connected to one end of the swing valve body output shaft 1004. The swing valve body output shaft 1004 transmits the output torque for the vane cylinder. An oil distribution cavity 1006 of the main valve body is provided on the side of the swing valve body main body 1001. The valve sleeve 9 is arranged in the oil distribution cavity 1006 of the valve body. There is an interference fit between the valve sleeve 9 and the oil distribution cavity 1006 of the valve body and it is installed by the cold fitting method to ensure that the valve sleeve 9 and the swing valve body 10 rotate together and there is no relative rotation between the two. An oil outlet 1007 of the valve body, a second oil outlet 1008 of the valve body, an oil inlet 1009 of the valve body and a second oil inlet 1010 of the valve body are successively provided at the top of the swing valve body main body 1001. The oil outlet 1007 of the valve body, the second oil outlet 1008 of the valve body, the oil inlet 1009 of the valve body and the second oil inlet 1010 of the valve body are all communicated with the oil distribution cavity 1006 of the valve body. The oil outlet 1007 of the valve body and the oil inlet 1009 of the valve body are distributed closely to the right of the bottom line of the root of the vane 1005. The second oil outlet 1008 of the valve body and the second oil inlet 1010 of the valve body are distributed closely to the left of the bottom line of the root of the vane 1005. An annular oil inlet groove 1011 and an annular oil outlet groove 1012 are provided on the oil-passing valve body 1002. The annular oil inlet groove 1011 is communicated with the high-pressure oil circuit 505 of the cylinder block. The annular oil outlet groove 1012 is communicated with the low-pressure oil circuit 504 of the cylinder block. A symmetrically arranged first oil inlet flow channel 1013 and a second oil inlet flow channel 1014 are provided in the swing valve body main body 1001. The two first oil inlet flow channels 1013 and the two second oil inlet flow channels 1014 are all communicated with the annular oil outlet groove 1012. The other end of the swing valve body main body 1001 is connected to a deep groove ball bearing 3. The other end of the swing valve body output shaft 1004 is connected to a second deep groove ball bearing 11.

[0057] Example 4:

[0058] Example 4 is basically the same as Example 1, and the differences are as follows:

[0059] A pilot-operated overflow compensation vane cylinder. The valve sleeve 9 includes a sleeve body 910, a valve sleeve high-pressure annular oil groove 901 and a valve sleeve low-pressure annular oil groove 903. The valve sleeve high-pressure annular oil groove 901 and the valve sleeve low-pressure annular oil groove 903 are arranged on the side circumference of the sleeve body 910. The valve sleeve high-pressure annular oil groove 901 and the valve sleeve low-pressure annular oil groove 903 are respectively communicated with the valve core 8, and cooperate with the valve core high-pressure oil inlet oil distribution boss 804 to realize the oil inlet and oil outlet of the valve core 8. A valve sleeve valve core cavity 909 is arranged on the side surface of the sleeve body 910. A valve sleeve oil outlet 905 is arranged on the left side of the valve sleeve high-pressure annular oil groove 901 on the side circumference of the sleeve body 910. Two valve sleeve oil outlets 906 and two valve sleeve oil inlets 908 are arranged between the valve sleeve high-pressure annular oil groove 901 and the valve sleeve low-pressure annular oil groove 903 on the side circumference of the sleeve body 910. A valve sleeve oil inlet 907 is arranged on the right side of the valve sleeve low-pressure annular oil groove 903 on the side circumference of the sleeve body 910. One valve sleeve oil outlet 905 is communicated with one valve body oil outlet 1007. Two valve sleeve oil outlets 906 are communicated with two valve body oil outlets 1008. One valve sleeve oil inlet 907 is communicated with one valve body oil inlet 1009. Two valve sleeve oil inlets 908 are communicated with two valve body oil inlets 1010. Two symmetrically arranged valve sleeve oil inlet rectangular openings 902 are arranged in the valve sleeve high-pressure annular oil groove 901 on the side circumference of the sleeve body 910. Both of the two valve sleeve oil inlet rectangular openings 902 are communicated with the valve core 8. Two symmetrically arranged valve sleeve oil outlet rectangular openings 904 are arranged in the valve sleeve low-pressure annular oil groove 903 on the side circumference of the sleeve body 910. Both of the two valve sleeve oil outlet rectangular openings 904 are communicated with the valve core 8. The valve sleeve 9 is of a cylindrical structure, and the outer surface diameter of the valve sleeve 9 is the same as the diameter of the oil distribution cavity of the swing valve body 10.

[0060] Example 5:

[0061] Example 5 is basically the same as Example 1, and the difference lies in:

[0062] A pilot-operated overflow-compensated vane cylinder. The spool 8 includes a spool input rod 801 and a spool oil distribution rod 802. The spool input rod 801 is key-connected to an external control motor. The right end of the spool input rod 801 is connected to the left end of the spool oil distribution rod 802. The spool oil distribution rod 802 is successively provided with a spool counterclockwise oil inlet groove 803, a spool high-pressure oil inlet distribution boss 804, a spool clockwise oil inlet groove 805, a spool counterclockwise oil outlet groove 806, a spool low-pressure oil outlet distribution boss 807 and a spool clockwise oil outlet groove 808. The spool low-pressure oil outlet distribution boss 807 is respectively communicated with a valve sleeve oil inlet rectangular port 902 and a valve sleeve oil outlet rectangular port 904. The width of the oil distribution surface of the high-pressure oil inlet distribution boss 804 is the same as the width of the valve sleeve oil inlet rectangular port 902. The spool clockwise oil inlet groove 805 and the spool counterclockwise oil outlet groove 806 are not communicated with the valve sleeve high-pressure annular oil groove 901. The width of the spool low-pressure oil outlet distribution boss 807 is the same as the width of the valve sleeve oil outlet rectangular port 904. The spool clockwise oil inlet groove 805 and the spool counterclockwise oil outlet groove 806 are not communicated with the valve sleeve low-pressure annular oil groove 903.

[0063] The above are only the preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. Any equivalent modifications or changes made by those of ordinary skill in the art according to the disclosure of the present invention shall be included in the protection scope recorded in the claims.

Claims

1. A pilot-operated overflow compensation vane cylinder, characterized in that : The pilot-operated overflow compensation vane cylinder includes a cylinder block (5), a spool valve (8), a valve sleeve (9) and a swing valve body (10); The left side of the cylinder block (5) is connected to the right side of a deep groove ball bearing (3). The side of the cylinder block (5) is located on the left side of a deep groove ball bearing (3) and is connected to the right side of the left end cover (2). The right side of the cylinder block (5) is connected to the left side of two deep groove ball bearings (11). The side of the cylinder block (5) is located on the right side of two deep groove ball bearings (11) and is connected to the left side of the right end cover (6). A stopper (4) is inserted into the top of the cylinder block (5). A valve sleeve (9) is provided on the left side of the cylinder block (5). A spool valve (8) is arranged inside the valve sleeve (9). The left end of the spool valve (8) penetrates through the left end cover (2) and extends to the outside of the left end cover (2). A swing valve body (10) is installed below the valve sleeve (9) inside the cylinder block (5). The upper left side of the left end cover (2) is connected to the right end of the low-pressure oil outlet pipe joint (1). The right end of the low-pressure oil outlet pipe joint (1) penetrates through the left end cover (2) and communicates with the cylinder block (5). The lower left side of the left end cover (2) is connected to the right end of the high-pressure oil inlet pipe joint (7). A pilot spool valve (15) is arranged at the right end of the spool valve (8) inside the cylinder block (5). The top of the cylinder block (5) corresponding to the pilot spool valve (15) is connected to an adjusting screw (12). The bottom of the adjusting screw (12) is connected to the inner wall of the pilot spool valve (15) through a pilot spring (13). A main spool valve (17) is arranged below the pilot spool valve (15) inside the cylinder block (5). A plug (14) is arranged on the front surface of the cylinder block (5) corresponding to the main spool valve (17). One end of the plug (14) is connected to the inner wall of the main spool valve (17) through a main spring (16); The cylinder block (5) includes a main cylinder block (51) and an overflow valve body (52). A bearing cavity (501) is provided at the left end of the main cylinder block (51). A deep groove ball bearing (3) is arranged inside the bearing cavity (501). Two bearing cavities (5011) are provided at the right end of the main cylinder block (51). Two deep groove ball bearings (11) are arranged inside the two bearing cavities (5011). A swing cavity (502) communicating with the bearing cavity (501) is provided at the left end of the main cylinder block (51). A valve sleeve (9) is arranged inside the swing cavity (502). A stopper insertion hole (503) is provided at the top of the main cylinder block (51). A stopper (4) is inserted into the stopper insertion hole (503). A cylinder block low-pressure oil circuit (504) is provided at the upper left side of the main cylinder block (51). The low-pressure oil outlet pipe joint (1), the cylinder block low-pressure oil circuit (504) and the swing cavity (502) are communicated with each other. A cylinder block high-pressure oil circuit (505) is provided at the lower left side of the main cylinder block (51). The high-pressure oil inlet pipe joint (7), the cylinder block high-pressure oil circuit (505) and the swing cavity (502) are communicated with each other.

2. The pilot-operated overflow compensation vane cylinder according to claim 1, characterized in that: The rear side of the main cylinder block (51) is connected to the front side of the overflow valve body (52). A pilot chamber (509) is provided at the top of the overflow valve body (52). A pressure regulating screw (12), a pilot spring (13), and a pilot valve core (15) are arranged in the pilot chamber (509). An overflow valve body main chamber (506) is provided on the front surface of the main cylinder block (51). A main valve core (17) and a main spring (16) are arranged in the overflow valve body main chamber (506). The pilot chamber (509) is communicated with the overflow valve body main chamber (506) through a pilot flow channel (511). The overflow valve body main chamber (506) is communicated with an overflow valve body high-pressure oil inlet flow channel (508). The overflow valve body high-pressure oil inlet flow channel (508) is connected to the cylinder block high-pressure oil circuit (505). The overflow valve body main chamber (506) is communicated with a main overflow flow channel (507). The main overflow flow channel (507) is connected to the cylinder block low-pressure oil circuit (504). The pilot chamber (509) is communicated with the main overflow flow channel (507) through a pilot overflow flow channel (510).

3. The pilot-operated overflow-compensated vane cylinder according to claim 2, characterized in that: The stop block (4) includes a pressing and sealing block (41) and an inserting block (42). The bottom of the pressing and sealing block (41) is connected to the top of the inserting block (42). The pressing and sealing block (41) is pressed against the stop block jack (503) through the pressure regulating screw (12). The inserting block (42) is arranged in the stop block jack (503).

4. The pilot-operated overflow compensation vane cylinder according to claim 3, characterized in that: The length of the inserting block (42) is the same as the length of the stop block jack (503). The top end of the inserting block (42) is an arc concave surface (43), and the arc angle of the arc concave surface (43) is 15 degrees to 20 degrees.

5. A pilot-operated overflow compensation vane cylinder according to claim 2, characterized in that: The swing valve body (10) includes a swing valve body main valve body (1001), a swing valve body oil-passing valve body (1002), a swing valve body bearing boss (1003), and a swing valve body output shaft (1004). One end of the swing valve body main valve body (1001) is connected to one end of the oil-passing valve body (1002). The other end of the oil-passing valve body (1002) is connected to one end of the bearing boss (1003). The other end of the bearing boss (1003) is connected to one end of the swing valve body output shaft (1004). A main valve body oil distribution chamber (1006) is provided on the side surface of the swing valve body main valve body (1001). A valve sleeve (9) is arranged in the valve body oil distribution chamber (1006). An oil outlet (1007) of the first valve body, an oil outlet (1008) of the second valve body, an oil inlet (1009) of the first valve body, and an oil inlet (1010) of the second valve body are successively provided at the top of the swing valve body main valve body (1001). The oil outlet (1007) of the first valve body, the oil outlet (1008) of the second valve body, the oil inlet (1009) of the first valve body, and the oil inlet (1010) of the second valve body are all communicated with the valve body oil distribution chamber (1006). An annular oil inlet groove (1011) and an annular oil outlet groove (1012) are provided on the oil-passing valve body (1002). The annular oil inlet groove (1011) is connected to the cylinder block high-pressure oil circuit (505). The annular oil outlet groove (1012) is connected to the cylinder block low-pressure oil circuit (504).

6. The pilot-operated overflow compensation vane cylinder according to claim 5, characterized in that: The main valve body (1001) of the swing valve body is provided with a symmetrically arranged first valve body oil inlet passage (1013) and a second valve body oil inlet passage (1014). The two first valve body oil inlet passages (1013) and the two second valve body oil inlet passages (1014) are both communicated with the annular oil outlet groove (1012). The other end of the swing valve body main valve body (1001) is connected to a deep groove ball bearing (3), and the other end of the swing valve body output shaft (1004) is connected to a second deep groove ball bearing (11).

7. A pilot-operated overflow compensation vane cylinder according to claim 5, characterized in that: The valve sleeve (9) includes a sleeve body (910), a valve sleeve high-pressure annular oil groove (901) and a valve sleeve low-pressure annular oil groove (903). The side circumference of the sleeve body (910) is provided with a valve sleeve high-pressure annular oil groove (901) and a valve sleeve low-pressure annular oil groove (903). The valve sleeve high-pressure annular oil groove (901) and the valve sleeve low-pressure annular oil groove (903) are respectively communicated with the valve core (8). The side surface of the sleeve body (910) is provided with a valve sleeve valve core cavity (909). On the side circumference of the sleeve body (910), a first valve sleeve oil outlet (905) is provided on the left side of the valve sleeve high-pressure annular oil groove (901). On the side circumference of the sleeve body (910), a second valve sleeve oil outlet (906) and a second valve sleeve oil inlet (908) are provided between the valve sleeve high-pressure annular oil groove (901) and the valve sleeve low-pressure annular oil groove (903). On the side circumference of the sleeve body (910), a first valve sleeve oil inlet (907) is provided on the right side of the valve sleeve low-pressure annular oil groove (903). The first valve sleeve oil outlet (905) is communicated with a first valve body oil outlet (1007), the second valve sleeve oil outlet (906) is communicated with a second valve body oil outlet (1008), the first valve sleeve oil inlet (907) is communicated with a first valve body oil inlet (1009), and the second valve sleeve oil inlet (908) is communicated with a second valve body oil inlet (1010).

8. A pilot-operated overflow compensation vane cylinder according to claim 7, characterized in that: On the side circumference of the sleeve body (910) and within the valve sleeve high-pressure annular oil groove (901), two symmetrically arranged valve sleeve oil inlet rectangular openings (902) are provided, and the two valve sleeve oil inlet rectangular openings (902) are both communicated with the valve core (8). On the side circumference of the sleeve body (910) and within the valve sleeve low-pressure annular oil groove (903), two symmetrically arranged valve sleeve oil outlet rectangular openings (904) are provided, and the two valve sleeve oil outlet rectangular openings (904) are both communicated with the valve core (8).

9. A pilot-operated overflow compensation vane cylinder according to claim 7, characterized in that: The valve core (8) includes a valve core input rod (801) and a valve core oil distribution rod (802). The right end of the valve core input rod (801) is connected to the left end of the valve core oil distribution rod (802). The valve core oil distribution rod (802) is successively provided with a valve core counterclockwise oil inlet groove (803), a valve core high-pressure oil inlet distribution boss (804), a valve core clockwise oil inlet groove (805), a valve core counterclockwise oil outlet groove (806), a valve core low-pressure oil outlet distribution boss (807) and a valve core clockwise oil outlet groove (808). The valve core low-pressure oil outlet distribution boss (807) is respectively communicated with the valve sleeve oil inlet rectangular openings (902) and the valve sleeve oil outlet rectangular openings (904).

10. A pilot-operated overflow compensation vane cylinder according to claim 9, characterized in that: The width of the oil distribution surface of the high-pressure oil inlet oil distribution boss (804) is the same as the width of the oil inlet rectangular port (902) of the valve sleeve. The clockwise oil inlet groove (805) of the valve core and the counterclockwise oil outlet groove (806) of the valve core are not connected to the high-pressure annular oil groove (901) of the valve sleeve. The width of the low-pressure oil outlet oil distribution boss (807) of the valve core is the same as the width of the oil outlet rectangular port (904) of the valve sleeve. The clockwise oil inlet groove (805) of the valve core and the counterclockwise oil outlet groove (806) of the valve core are not connected to the low-pressure annular oil groove (903) of the valve sleeve.

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