Electro-hydraulic integrated locking cylinder

Abstract

The present application relates to a kind of electro-hydraulic integrated locking cylinder, belong to locking cylinder technical field;Including locking oil cylinder, locking oil cylinder's cylinder outer wall is fixedly provided with oil tank, valve group, motor, inside the oil tank is fixedly provided with double pump, the output shaft of motor is fixedly connected with the action shaft of double pump;One of the outlet of double pump is connected with the lock-off cavity oil port of locking oil cylinder by locking control oil circuit, pressure sensor is arranged on locking control oil circuit;The other outlet of double pump is connected with the oil inlet of three-position four-way reversing valve by telescopic control oil circuit, two working oil ports of three-position four-way reversing valve are connected with the rod cavity oil port and the rod cavity oil port of locking oil cylinder respectively;The oil return port of three-position four-way reversing valve is connected with oil tank by first oil return oil circuit;Solve the current hydraulic locking cylinder limited by pump station position, the application range of locking cylinder is limited.

Description

Technical Field

[0001] This invention belongs to the field of locking cylinder technology, specifically relating to an electro-hydraulic integrated locking cylinder. Background Technology

[0002] Interference-locking hydraulic cylinders can achieve locking at any position. When high-pressure oil is filled into the unlocking chamber, it can move like a regular hydraulic cylinder in the unlocked state. When it reaches the desired position, the high-pressure oil is released, and the hydraulic cylinder immediately locks itself by generating locking force through the locking sleeve, ensuring that the hydraulic cylinder can achieve locking at any position. Interference-locking hydraulic cylinders achieve locking by the frictional force generated by the interference fit between the locking sleeve and the piston rod (or cylinder barrel). They offer high locking force, reliable locking, simple structure, small size, and convenient installation and use. When the hydraulic cylinder is working, it must be unlocked first before extension / retraction can be performed, ensuring safety and reliability. However, existing interference-locking cylinders are arranged separately from the hydraulic control pump station. This limitation by the pump station's location restricts the application range of the locking cylinder, significantly limiting its versatility and applicability. Summary of the Invention

[0003] This invention overcomes the shortcomings of the prior art and proposes an electro-hydraulic integrated locking cylinder; solving the problem that the application range of current hydraulic locking cylinders is limited by the location of the pump station.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solution.

[0005] An electro-hydraulic integrated locking cylinder includes a locking cylinder. An oil tank, a valve group, and a motor are fixedly installed on the outer wall of the cylinder barrel. A double pump is fixedly installed inside the oil tank. The output shaft of the motor is fixedly connected to the operating shaft of the double pump. One outlet of the double pump is connected to the unlocking chamber port of the locking cylinder through a locking control oil circuit. A pressure sensor is installed on the locking control oil circuit. The other outlet of the double pump is connected to the inlet of a three-position four-way directional valve through a telescoping control oil circuit. The two working ports of the three-position four-way directional valve are respectively connected to the rod chamber port and the rodless chamber port of the locking cylinder. The return port of the three-position four-way directional valve is connected to the oil tank through a first return oil circuit.

[0006] Furthermore, a fixed lug is fixedly provided at one end of the cylinder opening of the locking cylinder, and a first guide sleeve is fixedly provided inside the other end opening of the cylinder. A piston rod is slidably inserted inside the cylinder, with one end of the piston rod passing through the first guide sleeve and extending to the outside of the cylinder. A telescopic lug is fixedly provided at the outer end opening of the piston rod, and a second guide sleeve is fixedly provided inside the inner end opening of the piston rod. An oil guide seat is fixedly provided at the end of the cylinder near the fixed lug, and an oil guide groove is provided inside the oil guide seat. An oil supply pipe is fixedly provided at the end of the oil guide seat facing the telescopic lug, with one end of the oil supply pipe connected to the inside of the oil guide groove, and the other end of the oil supply pipe extending through the second guide sleeve into the inside of the piston rod.

[0007] Furthermore, a locking sleeve and a first piston and a second piston are fixedly sleeved on the outer side of one inner end of the piston rod. The locking sleeve is located between the first piston and the second piston, and the outer wall of the locking sleeve and the inner wall of the cylinder are in an interference fit. The rod chamber oil port and the rodless chamber oil port are respectively provided at both ends of the side wall of the cylinder.

[0008] Furthermore, a first oil passage groove is provided on the side wall of the cylinder barrel, and a first annular groove is provided on the inner wall of the cylinder barrel at the first oil passage groove, the first annular groove being connected to the oil guide groove; a hollow second oil passage groove is provided inside the piston rod, and the end of the oil supply pipe away from the oil guide seat is connected to the interior of the second oil passage groove; a ring of third oil passage grooves is provided on the side wall of the piston rod, and the second oil passage groove is connected to all the third oil passage grooves; a ring of fourth oil passage grooves is provided on the side wall of the locking sleeve, and the third oil passage grooves are connected to each other; the outer end of the fourth oil passage groove is connected to the inner wall of the cylinder barrel.

[0009] Furthermore, the end of the locking control oil circuit away from the dual pump is connected to the outer end of the first oil passage.

[0010] Furthermore, an oil suction filter is fixedly installed inside the oil tank, and the oil suction filter is located inside the oil; the outlet of the oil suction filter is connected to the inlet of the dual pump through the oil inlet passage.

[0011] Furthermore, a check valve is installed at the end of both the locking control oil circuit and the telescopic control oil circuit near the dual pump.

[0012] Furthermore, the locking control oil circuit is connected to the oil tank via a second return oil circuit, and a first electromagnetic unloading valve is installed on the second return oil circuit; a first overflow valve is also installed between the locking control oil circuit and the second return oil circuit.

[0013] Furthermore, a second electromagnetic unloading valve and a second overflow valve are installed between the telescopic control oil circuit and the first return oil circuit.

[0014] Furthermore, both the first and second return oil lines are connected to the inlet of the return oil filter, and the outlet of the return oil filter is connected to the inside of the oil tank through the main return oil line.

[0015] The beneficial effects of this invention compared to the prior art are as follows: (1) The present invention provides an electro-hydraulic integrated locking cylinder that integrates the oil tank, motor, double pump, valve group and locking cylinder into a single unit, eliminating the dependence on external pump station and long-distance external pipeline. The whole unit can be directly installed and used, greatly reducing the workload of on-site pipeline laying and wiring, and broadening the application scenarios of interference locking cylinder.

[0016] (2) The present invention provides an electro-hydraulic integrated locking cylinder, which relies on the interference friction clamping principle to achieve mechanical locking at any position of the piston rod in the stroke. It does not rely on valves for pressure holding, avoids the internal leakage and drift problem existing in pure hydraulic locking, has high locking stiffness, and good stability in the long-term static position.

[0017] (3) The present invention provides an electro-hydraulic integrated locking cylinder, which is powered by a dual pump. The first pump in the dual pump, together with the first electromagnetic unloading valve, the first overflow valve, and the pressure sensor, forms a locking / unlocking control circuit. The second pump in the dual pump, together with the three-position four-way directional valve, the second electromagnetic unloading valve, and the second overflow valve, forms a cylinder extension and retraction action control circuit. By switching the electromagnetic unloading valve, the directional valve, the overflow valve, and other valves, the locking / unlocking control circuit and the cylinder extension and retraction action control circuit can be controlled independently. The unlocking and extension actions do not interfere with each other. The unlocking force and the lifting force are set separately. The control logic of forcing unlocking before action avoids damage to the piston rod when starting under load. The cylinder automatically depressurizes and locks when power is off, providing passive safety protection capabilities.

[0018] (4) The present invention provides an electro-hydraulic integrated locking cylinder. The control valve group adopts an integrated design with built-in oil passages, which greatly reduces the number of external pipeline joints and reduces the oil leakage failure rate. The pressure is calibrated at the factory and can be put into use on site after installation, with lower debugging and maintenance costs.

[0019] (5) The present invention provides an electro-hydraulic integrated locking cylinder with a built-in pressure sensor in the oil circuit, which can output locking and unlocking status signals, and can be connected to the whole machine control system to realize safety interlocking and fault early warning, and adapt to the automated operation requirements of intelligent equipment. Attached Figure Description

[0020] The present invention will now be described in further detail with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the locking cylinder. Figure 3 This is a schematic diagram of the hydraulic control system of the present invention; Among them, 1 is the locking cylinder, 2 is the oil tank, 3 is the valve group, 4 is the motor, 5 is the double pump, 6 is the locking control oil circuit, 7 is the unlocking chamber oil port, 8 is the pressure sensor, 9 is the telescopic control oil circuit, 10 is the three-position four-way directional valve, 11 is the rod chamber oil port, 12 is the rodless chamber oil port, 13 is the first return oil circuit, 14 is the fixed support lug, 15 is the first guide sleeve, 16 is the piston rod, 17 is the locking sleeve, 18 is the first piston, and 19 is the second piston. Plug, 20 is telescopic lug, 21 is the first oil passage groove, 22 is the second oil passage groove, 23 is the third oil passage groove, 24 is the fourth oil passage groove, 25 is the suction filter, 26 is the one-way valve, 27 is the second return oil circuit, 28 is the first electromagnetic unloading valve, 29 is the first overflow valve, 30 is the second electromagnetic unloading valve, 31 is the second overflow valve, 32 is the return oil filter, 33 is the cylinder, 34 is the oil guide seat, 35 is the oil delivery pipe, and 36 is the second guide sleeve. Detailed Implementation

[0021] To make the technical problems to be solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solutions of this invention are described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0022] like Figure 1 As shown in Figure 3, this invention provides an electro-hydraulic integrated locking cylinder, including a locking cylinder 1. An oil tank 2, a valve group 3, and a motor 4 are fixedly installed on the outer wall of the cylinder barrel 33 of the locking cylinder 1. A double pump 5 is fixedly installed inside the oil tank 2. The output shaft of the motor 4 is fixedly connected to the actuating shaft of the double pump 5. One outlet of the double pump 5 is connected to the unlocking chamber port 7 of the locking cylinder 1 through a locking control oil circuit 6. A pressure sensor 8 is installed on the locking control oil circuit 6. The other outlet of the double pump 5 is connected to the inlet of a three-position four-way directional valve 10 through a telescopic control oil circuit 9. The two working ports of the three-position four-way directional valve 10 are respectively connected to the rod chamber port 11 and the rodless chamber port 12 of the locking cylinder 1. The return port of the three-position four-way directional valve 10 is connected to the oil tank 2 through a first return oil circuit 13.

[0023] The output shaft of the motor 4 passes through the side wall of the oil tank 2 and is fixedly connected to the actuating shaft of the dual pump 5.

[0024] The dual pump 5 consists of a low-pressure high-flow pump and a high-pressure low-flow pump. The low-flow pump is connected to the locking control oil circuit 6, and the high-flow pump is connected to the telescopic control oil circuit 9.

[0025] The cylinder 33 of the locking cylinder 1 is a cylindrical structure with openings at both ends. A fixing lug 14 is fixedly installed at one end of the cylinder 33 by screws, and a first guide sleeve 15 is fixedly installed inside the other end of the cylinder 33. A piston rod 16 is slidably inserted into the cylinder 33. The piston rod 16 is a cylindrical rod structure with openings at both ends, and one outer end of the piston rod 16 extends out of the cylinder 33 through the first guide sleeve 15. A telescopic lug 20 is fixedly installed at the outer end of the piston rod 16, and a second guide sleeve 36 is fixedly installed inside the inner end of the piston rod 16. An oil guide seat 34 is fixedly installed inside the cylinder 33 near the fixing lug 15, and an oil guide groove is provided inside the oil guide seat 34. An oil supply pipe 35 is fixedly installed at one end of the oil guide seat 34 facing the telescopic support ear 20. One end of the oil supply pipe 35 is connected to the inside of the oil guide groove, and the other end of the oil supply pipe 35 extends through the second guide sleeve 36 to the inside of the piston rod 16. The second guide sleeve 36 is slidably sleeved on the outside of the oil supply pipe 35.

[0026] A locking sleeve 17, a first piston 18, and a second piston 19 are fixedly sleeved on the outer side of one inner end of the piston rod 16. The locking sleeve 17 is located between the first piston 18 and the second piston 19, and both ends of the locking sleeve 17 are in contact with the first piston 18 and the second piston 19. Sealing rings are provided on the outer walls of both the first piston 18 and the second piston 19 to ensure a tight seal between them and the inner wall of the cylinder 33. The outer wall of the locking sleeve 17 and the inner wall of the cylinder 33 are interference-fitted. A rod-side port 11 and a rodless-side port 12 are respectively provided at both ends of the side wall of the cylinder 33. The locking sleeve 17, the first piston 18, and the second piston 19 are all located between the rod-side port 11 and the rodless-side port 12.

[0027] A first oil passage groove 21, with its two ends connected, is provided on the side wall of cylinder 33. One end of the first oil passage groove 21 opens to become the unlocking chamber oil port 7, which is located on the side of the rodless chamber oil port 12 near the fixed bracket 14. That is, the rodless chamber oil port 12 is located between the unlocking chamber oil port 7 and the rod chamber oil port 11. A first annular groove is provided on the inner wall of cylinder 33 at the first oil passage groove 21. The first annular groove is connected to the oil guide groove, meaning that the first oil passage groove 21 and the oil supply pipe 35 are connected through the first annular groove and the oil guide groove. A hollow second oil passage groove 22 is provided inside the piston rod 16, and the end of the oil supply pipe 35 away from the oil guide seat 34 is connected to the interior of the second oil passage groove 22. A third oil passage groove 23, arranged in a circular array, is provided on the side wall of piston rod 16. The third oil passage grooves 23 extend radially along piston rod 16, and the second oil passage groove 22 is connected to all the third oil passage grooves 23. A fourth oil passage groove 24 arranged in a circular array is provided on the side wall of the locking sleeve 17, and the fourth oil passage groove 24 extends radially along the locking sleeve 17. A second annular groove is provided on the outer wall of the piston rod 16 at the position corresponding to the third oil passage groove 23. Both the third oil passage groove 23 and the fourth oil passage groove 24 are connected to the second annular groove, so that the third oil passage groove 23 and the fourth oil passage groove 24 are connected through the second annular groove.

[0028] An oil suction filter 25 is also fixedly installed inside the oil tank 2. The oil suction filter 25 is located inside the oil. The outlet of the oil suction filter 25 is connected to the inlet of the dual pump 5 through the oil inlet passage.

[0029] One-way valves 26 are installed at the ends of the locking control oil circuit 6 and the telescopic control oil circuit 9 near the dual pump 5.

[0030] The end of the locking control oil circuit 6 furthest from the dual pump 5 is connected to the outer end of the first oil passage 21. The middle section of the locking control oil circuit 6 is also connected to the oil tank 2 via a second return oil circuit 27, on which a first electromagnetic unloading valve 28 is installed. A first overflow valve 29 is also installed between the locking control oil circuit 6 and the second return oil circuit 27.

[0031] A second electromagnetic unloading valve 30 and a second overflow valve 31 are provided between the telescopic control oil circuit 9 and the first return oil circuit 13.

[0032] Both the first return oil line 13 and the second return oil line 27 are connected to the inlet end of the return oil filter 32, and the outlet end of the return oil filter 32 is connected to the inside of the oil tank 2 through the main return oil line. The return oil filter 32 is fixedly installed inside the oil tank 2, and the outlet end of the main return oil line extends into the oil inside the oil tank 2.

[0033] The valve assembly 3 includes a valve block, a three-position four-way directional valve 10, a first electromagnetic unloading valve 28, a second electromagnetic unloading valve 30, a first overflow valve 29, a second overflow valve 31, and a pressure sensor 8, all of which are inserted into the valve block. The valve block is fixed to the outer wall of the cylinder 33 of the locking cylinder 1 by screws. An internal oil passage is provided in the valve block, connecting the dual pump, the unlocking chamber port 7, the rod chamber port 11, and the rodless chamber port 12.

[0034] Both the oil tank 2 and the motor 4 are fixed to the outer wall of the cylinder 33 of the locking cylinder 1 by screws.

[0035] The working principle of this invention is as follows: In the initial state, the motor 4 is not running, so high-pressure oil is not supplied to the locking control oil circuit 6 and the telescopic control oil circuit 9. At this time, the locking sleeve 17 maintains a large frictional force with the inner wall of the cylinder 33 under the interference fit. The inner wall of the cylinder 33 tightly holds the locking sleeve, so that the locking sleeve 17 and the inner wall of the cylinder 33 cannot move relative to each other, thereby locking the piston rod 16 and preventing it from sliding inside the cylinder 33.

[0036] When it is necessary to unlock the locking cylinder 1, the first solenoid unloading valve 28 is energized, the second solenoid unloading valve 30 is de-energized, and both ends of the three-position four-way directional valve 10 are de-energized, so that the three-position four-way directional valve 10 is in the neutral position. Then the control motor 4 starts to run, and the motor 4 drives the double pump 5 to operate. The double pump 5 draws oil from inside the oil tank 2. The drawn oil is filtered by the suction filter 25 and discharged outward from the two outlets of the double pump 5, respectively discharged into the locking control oil circuit 6 and the telescopic control oil circuit 9.

[0037] Because the first electromagnetic unloading valve 28 is energized, the locking control oil circuit 6 is not unloaded. The high-pressure oil inside the locking control oil circuit 6 flows sequentially through the first oil passage 21, the guide oil passage, the oil supply pipe 35, the second oil passage 22, a ring of the third oil passage 23, and a ring of the fourth oil passage 24 into the area between the outer wall of the locking sleeve 17 and the inner wall of the cylinder 33. The flowing high-pressure oil simultaneously applies pressure to the inner wall of the cylinder 33 and the outer wall of the locking sleeve 17, causing the cylinder 33 to expand outward. As the high-pressure oil continues to flow in, the pressure inside the locking control oil circuit 6 continues to rise. The pressure sensor 8 monitors the pressure inside the locking control oil circuit 6 in real time. When the pressure value monitored by the pressure sensor 8 reaches the unlocking threshold, it proves that the inner wall of the cylinder 33 and the outer wall of the locking sleeve 17 have separated and formed a gap. At this time, the locking cylinder 1 is in the "unlocked" state, and the piston rod 16 can drive the first piston 18 and the second piston 19 to slide inside the cylinder 33. The maximum unlocking pressure is limited by the first relief valve 29 to prevent excessive unlocking pressure from damaging the locking sleeve 17.

[0038] After receiving the "unlock" signal from locking cylinder 1, the controller allows the second electromagnetic unloading valve 30 to be energized and simultaneously allows the three-position four-way directional valve 10 to operate. Only then can the cylinder extend or retract. In this way, locking cylinder 1 and locking sleeve 17 are safely interlocked. Locking cylinder 1 cannot operate when locking sleeve 17 is not unlocked, preventing damage to the equipment from locked movement.

[0039] When it is necessary to control the piston rod 16 of the locking cylinder 1 to extend, the first electromagnetic unloading valve 28 and the second electromagnetic unloading valve 30 are both energized. The locking control oil circuit 6 maintains the unlocking pressure and energizes one side of the three-position four-way directional valve 10, causing the valve core to switch to one side. At this time, the oil inlet of the three-position four-way directional valve 10 is connected to the oil port 12 of the rodless chamber of the locking cylinder 1, and the oil return port of the three-position four-way directional valve 10 is connected to the oil port 11 of the rod chamber of the locking cylinder 1. High-pressure oil enters the rodless chamber of the locking cylinder 1, and the pressure pushes the first piston 18, causing the piston rod 16 to extend outward. The oil inside the rod chamber is squeezed out and flows back to the oil tank 2 along the first return oil circuit 13. The maximum lifting force of the locking cylinder 1 is set by the second relief valve 31. When the oil pressure inside the second return oil circuit 27 exceeds the oil pressure corresponding to the maximum lifting force, the second relief valve 31 opens to unload oil, thereby ensuring the safety of the locking cylinder 1.

[0040] When it is necessary to control the retraction of the piston rod 16 of the locking cylinder 1, both the first electromagnetic unloading valve 28 and the second electromagnetic unloading valve 30 are energized. The locking control oil circuit 6 maintains the unlocking pressure and energizes the other side of the three-position four-way directional valve 10, causing the valve core to switch to the other side. At this time, the oil inlet of the three-position four-way directional valve 10 is connected to the oil port 11 of the rod chamber of the locking cylinder 1, and the oil return port of the three-position four-way directional valve 10 is connected to the oil port 12 of the rodless chamber of the locking cylinder 1. High-pressure oil enters the rod chamber of the locking cylinder 1, and the pressure pushes the second piston 19, causing the piston rod 16 to retract inward. The oil inside the rodless chamber is squeezed out and flows back to the oil tank 2 along the first return oil circuit 13.

[0041] When the piston rod 16 reaches the designated position, both sides of the three-position four-way directional valve 10 are de-energized. At this time, the three-position four-way directional valve 10 returns to the neutral position, and the locking cylinder 1 stops extending and retracting. The first electromagnetic unloading valve 28 and the second electromagnetic unloading valve 30 are both de-energized, so that the locking control oil circuit 6 is connected to the second return oil circuit 27. The high-pressure oil inside the locking control oil circuit 6 flows directly back to the oil tank 2 through the second return oil circuit 27. At this time, the pressure between the outer wall of the locking sleeve 17 and the inner wall of the cylinder 33 is zeroed. The cylinder 33 recovers its elasticity and contracts to re-form an interference fit with the locking sleeve 17, thereby locking the piston rod 16.

[0042] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An electro-hydraulic integrated locking cylinder, characterized in that: The system includes a locking cylinder (1), an oil tank (2), a valve group (3), and a motor (4) fixedly installed on the outer wall of the cylinder barrel (33) of the locking cylinder (1). A double pump (5) is fixedly installed inside the oil tank (2), and the output shaft of the motor (4) is fixedly connected to the operating shaft of the double pump (5). One of the outlets of the double pump (5) is connected to the unlocking chamber oil port (7) of the locking cylinder (1) through a locking control oil circuit (6). 6) A pressure sensor (8) is installed on it; the other outlet of the double pump (5) is connected to the oil inlet of the three-position four-way directional valve (10) through the telescopic control oil circuit (9), and the two working oil ports of the three-position four-way directional valve (10) are respectively connected to the rod chamber oil port (11) and the rodless chamber oil port (12) of the locking cylinder (1); the return oil port of the three-position four-way directional valve (10) is connected to the oil tank (2) through the first return oil circuit (13).

2. The electro-hydraulic integrated locking cylinder according to claim 1, characterized in that: The locking cylinder (1) has a fixed lug (14) fixedly installed at one end of the cylinder barrel (33), and a first guide sleeve (15) fixedly installed inside the other end of the cylinder barrel (33). A piston rod (16) is slidably inserted inside the cylinder barrel (33), and one end of the piston rod (16) extends through the first guide sleeve (15) to the outside of the cylinder barrel (33). A telescopic lug (20) is fixedly installed at the opening of the outer end of the piston rod (16), and a telescopic lug (20) is fixed at the inner end of the piston rod (16). A second guide sleeve (36) is fixedly installed inside the opening; an oil guide seat (34) is fixedly installed at one end of the cylinder (33) near the fixed support (15), and an oil guide groove is provided inside the oil guide seat (34); an oil supply pipe (35) is fixedly installed at one end of the oil guide seat (34) facing the telescopic support (20), one end of the oil supply pipe (35) is connected to the inside of the oil guide groove, and the other end of the oil supply pipe (35) extends through the second guide sleeve (36) to the inside of the piston rod (16).

3. The electro-hydraulic integrated locking cylinder according to claim 2, characterized in that: A locking sleeve (17) and a first piston (18) and a second piston (19) are fixedly sleeved on the outer side of one end of the piston rod (16). The locking sleeve (17) is located between the first piston (18) and the second piston (19). The outer wall of the locking sleeve (17) and the inner wall of the cylinder (33) are in an interference fit. The rod chamber oil port (11) and the rodless chamber oil port (12) are respectively provided at both ends of the side wall of the cylinder (33).

4. The electro-hydraulic integrated locking cylinder according to claim 3, characterized in that: A first oil passage groove (21) is provided on the side wall of the cylinder (33), and a first annular groove is provided on the inner wall of the cylinder (33) at the first oil passage groove (21), and the first annular groove is connected to the oil guide groove; a hollow second oil passage groove (22) is provided inside the piston rod (16), and the end of the oil supply pipe (35) away from the oil guide seat (34) is connected to the inside of the second oil passage groove (22); a ring of third oil passage groove (23) is provided on the side wall of the piston rod (16), and the second oil passage groove (22) is connected to all the third oil passage grooves (23); a ring of fourth oil passage groove (24) is provided on the side wall of the locking sleeve (17), and the third oil passage groove (23) and the fourth oil passage groove (24) are connected to each other; the outer end of the fourth oil passage groove (24) is connected to the inner wall of the cylinder (33).

5. The electro-hydraulic integrated locking cylinder according to claim 4, characterized in that: The end of the locking control oil circuit (6) away from the dual pump (5) is connected to the outer end of the first oil passage (21).

6. The electro-hydraulic integrated locking cylinder according to claim 1, characterized in that: An oil suction filter (25) is also fixedly installed inside the oil tank (2). The oil suction filter (25) is located inside the oil. The outlet of the oil suction filter (25) is connected to the inlet of the dual pump (5) through the oil inlet circuit.

7. The electro-hydraulic integrated locking cylinder according to claim 1, characterized in that: One-way valves (26) are provided at the end of the locking control oil circuit (6) and the telescopic control oil circuit (9) near the double pump (5).

8. The electro-hydraulic integrated locking cylinder according to claim 1, characterized in that: The middle part of the locking control oil circuit (6) is also connected to the oil tank (2) through the second return oil circuit (27). A first electromagnetic unloading valve (28) is installed on the second return oil circuit (27). A first overflow valve (29) is also installed between the locking control oil circuit (6) and the second return oil circuit (27).

9. An electro-hydraulic integrated locking cylinder according to claim 8, characterized in that: A second electromagnetic unloading valve (30) and a second overflow valve (31) are provided between the telescopic control oil circuit (9) and the first return oil circuit (13).

10. An electro-hydraulic integrated locking cylinder according to claim 9, characterized in that: The first return oil circuit (13) and the second return oil circuit (27) are both connected to the inlet end of the return oil filter (32), and the outlet end of the return oil filter (32) is connected to the inside of the oil tank (2) through the main return oil circuit.

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