A multi-layer bidirectional self-locking hydraulic pump

Abstract

This invention relates to the field of hydraulic gear pump technology and discloses a multi-layer bidirectional self-locking hydraulic pump, including a fastening bolt. A multi-layer control mechanism is disposed on the outside of the fastening bolt. The multi-layer control mechanism integrates hydraulic power and pressure control, eliminating the need for external components. A pressure regulating mechanism is disposed inside the multi-layer control mechanism to control the pressure within the oil circuit. The multi-layer control mechanism includes a gear power layer threadedly connected to the outer periphery of the fastening bolt, and a return oil control layer is disposed on top of the gear power layer. This invention highly integrates hydraulic power and control functions internally. This structure eliminates the need for external control components in traditional hydraulic systems, enabling coaxial connection between the first and second oil circuits between layers. This not only reduces the overall size of the equipment but also significantly shortens the oil transmission path, reducing the risks associated with external pipeline connections.

Description

Technical Field

[0001] This invention relates to the field of hydraulic gear pump technology, specifically to a multi-layer bidirectional self-locking hydraulic pump. Background Technology

[0002] Hydraulic pump stations are the power core of hydraulic systems and are widely used in industrial automation, engineering machinery, precision instruments and other fields. They convert mechanical energy into hydraulic energy by driving a hydraulic pump with an electric motor, providing power to the actuators. As modern equipment develops towards miniaturization and integration, the market has placed higher demands on the size, weight, energy consumption and adaptability of hydraulic pump stations. Especially in space-constrained application scenarios, hydraulic pump stations need to simultaneously meet the requirements of high-pressure output, compact structure and reliable operation. The design of traditional hydraulic pump stations is no longer suitable for the development needs of new equipment.

[0003] Existing bidirectional hydraulic gear pumps employ a design where the inlet check valve has an external opening and is sealed with screws, resulting in a relatively complex manufacturing process. Furthermore, these pumps only provide basic high-pressure output; oil circuit reversal and pressure control rely on independent external solenoid valves, valve blocks, and relief valves. The solenoid valves switch the oil circuit direction, while the relief valves regulate system pressure. The gear pumps and various external control components are often installed separately, requiring numerous pipelines to form a closed loop in the overall hydraulic system. This leads to structural redundancy and complex piping in traditional hydraulic systems, significantly increasing the overall size and weight of the equipment. The excessive number of pipe joints and external components also increases potential failure points, resulting in low system integration and operational reliability. Additionally, they are unsuitable for the installation space requirements of smaller equipment.

[0004] To address the aforementioned technical problems, this invention proposes a multi-layer bidirectional self-locking hydraulic pump to improve upon many shortcomings of traditional hydraulic pump stations. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a multi-layer bidirectional self-locking hydraulic pump, which solves the problems of traditional bidirectional hydraulic gear pumps having cumbersome manufacturing processes and relying on external components and pipelines to achieve reversal, pressure control, and self-locking. These problems result in redundant system structure, large size and weight, numerous failure points, low integration and operational reliability, and an inability to meet the needs of miniaturized and integrated equipment and space-constrained scenarios.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a multi-layer bidirectional self-locking hydraulic pump, comprising a fastening bolt, wherein a multi-layer control mechanism is provided on the outside of the fastening bolt, the multi-layer control mechanism is used to integrate hydraulic power and pressure control, eliminating the need for external components, and a pressure regulating mechanism is provided inside the multi-layer control mechanism, the pressure regulating mechanism being used to control the pressure in the oil circuit.

[0007] Preferably, the multi-layer control mechanism includes a gear power layer, which is threadedly connected to the outer periphery of the fastening bolt. A return oil control layer is provided on the top of the gear power layer. An oil return layer is slidably connected to the outer side of the fastening bolt. An oil circuit output sealing layer is slidably connected to the outer side of the fastening bolt. A rotating shaft is rotatably connected inside the gear power layer. A power gear is fixedly connected to the outer side of the rotating shaft. A rotating shaft is rotatably connected inside the gear power layer. A driven gear is fixedly connected to the outer side of the rotating shaft. The power gear and the driven gear mesh with each other. A first oil groove and a second oil groove are formed inside the gear power layer. Two check valve steel balls are provided inside the gear power layer.

[0008] Preferably, a first oil passage is provided inside the oil return control layer, the oil return layer, and the oil passage output sealing layer, and a second oil passage is provided inside the oil return control layer, the oil return layer, and the oil passage output sealing layer.

[0009] Preferably, the pressure regulating mechanism includes an overflow valve adjusting screw, which is threadedly connected inside the oil return control layer. A second spring is fixedly connected to the top of the overflow valve adjusting screw, and a second steel ball is fixedly connected to the other end of the second spring. An oil drain channel is provided inside the oil return control layer. Two pistons are slidably connected inside the oil return control layer. A first spring is fixedly connected to the inner side of the oil return layer, and a first steel ball is fixedly connected to the bottom of the first spring. A third spring is fixedly connected to the inner side of the oil return layer, and a third steel ball is fixedly connected to the bottom of the third spring. An oil return groove is provided inside the oil return layer, and two shaft holes are provided at the bottom of the oil return control layer.

[0010] Preferably, both the rotating shaft and the rotating shaft are rotatably connected inside the shaft hole, and an oil inlet is provided on the outer side of the gear power layer.

[0011] Preferably, the oil inlet is connected to the second oil tank, and the oil inlet is connected to the first oil tank.

[0012] Preferably, the first steel ball abuts against the top of the oil return control layer, and the third steel ball is slidably connected inside the oil return layer.

[0013] Preferably, the bottom of the piston has a small hole communicating with the gear power layer, and the top of the piston is in contact with the third steel ball.

[0014] Preferably, the oil circuit output sealing layer is pressed onto the top of the return oil layer, and the first oil circuit, the second oil circuit, and the oil circuit of the return oil layer are precisely coaxially connected.

[0015] Preferably, the overflow valve adjusting screw is elastically linked with the second spring, and the pressure is adjusted by changing the preload of the second spring by turning the overflow valve adjusting screw.

[0016] This invention provides a multi-layer bidirectional self-locking hydraulic pump. It has the following beneficial effects: 1. This invention integrates hydraulic power and pressure control functions directly into a multi-layer control mechanism by sequentially setting a gear power layer, a return oil control layer, a return oil layer, and an oil circuit output sealing layer on the outside of the fastening bolts. This structure eliminates the need for external control components in traditional hydraulic systems, enabling the first and second oil circuits to be coaxially connected between layers. This not only reduces the overall size of the equipment but also shortens the oil transmission path and reduces the risks associated with external pipeline connections.

[0017] 2. This invention features convenient pressure regulation and bidirectional self-locking functions, improving the applicability of the equipment. In the pressure regulation mechanism set inside the return oil control layer, the operator only needs to turn the overflow valve adjustment screw to change the preload of the second spring, thereby controlling the oil circuit pressure. At the same time, in conjunction with the oil groove in the gear power layer and the check valve steel ball, when the power gear rotates forward or backward, the equipment can automatically switch the oil inlet and outlet directions, and use the cooperation of the spring and steel ball to lock the oil circuit, meeting the bidirectional control requirements of the hydraulic system under different working conditions. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the multi-layer control mechanism of the present invention; Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle; Figure 4 This is a schematic diagram of the pressure regulating mechanism of the present invention; Figure 5 For the present invention Figure 4 Enlarged view at point B in the middle; Figure 6 This is a schematic diagram of the structure of the oil return control layer of the present invention; Figure 7 This is a schematic diagram of the structure of the oil return layer of the present invention; Figure 8 This is a schematic diagram of the structure of the oil circuit output sealing layer of the present invention; Figure 9 This is a cross-sectional schematic diagram of the present invention.

[0019] The components include: 1. Fastening bolts; 2. Multi-layer control mechanism; 21. Gear power layer; 22. Oil return control layer; 23. Oil return layer; 24. Oil circuit output sealing layer; 25. Rotating shaft; 26. Power gear; 27. Driven gear; 28. Rotating shaft; 29. ​​Check valve steel ball; 210. First oil groove; 211. Second oil groove; 3. First oil circuit; 4. Second oil circuit; 5. Oil inlet; 6. Pressure regulating mechanism; 61. First spring; 62. First steel ball; 63. Piston; 64. Overflow valve adjusting screw; 65. Second spring; 66. Oil drain channel; 67. Second steel ball; 68. Third spring; 69. Third steel ball; 610. Oil return groove; 611. Shaft hole. Detailed Implementation

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see the appendix Figure 1 - Appendix Figure 9 This invention provides a multi-layer bidirectional self-locking hydraulic pump, including a fastening bolt 1. A multi-layer control mechanism 2 is provided on the outside of the fastening bolt 1. The multi-layer control mechanism 2 is used to integrate hydraulic power and pressure control, eliminating the need for external components. A pressure regulating mechanism 6 is provided inside the multi-layer control mechanism 2. The pressure regulating mechanism 6 is used to control the pressure in the oil circuit. A first oil circuit 3 is opened inside the return oil control layer 22, the return oil layer 23, and the oil circuit output sealing layer 24. A second oil circuit 4 is opened inside the return oil control layer 22, the return oil layer 23, and the oil circuit output sealing layer 24. Specifically, the multi-layer bidirectional self-locking hydraulic pump disclosed in this invention integrates hydraulic power and pressure control functions internally by sleeved a multi-layer control mechanism 2 on the outside of the fastening bolt 1, and by pressing and sealing the middle return oil control layer 22 and return oil layer 23 through the oil circuit output sealing layer 24 and the bottom gear power layer 21, thus eliminating the need for additional external control components. A pressure regulating mechanism 6 is configured inside the multi-layer control mechanism 2 to control the pressure demand in the oil circuit. At the same time, the return oil control layer 22, return oil layer 23 and oil circuit output sealing layer 24 in the multi-layer structure are connected internally by a first oil circuit 3 and a second oil circuit 4, ensuring the connectivity of the oil transmission channels between the multi-layer stages inside the pump body and the compactness of the structure.

[0022] Please see the appendix Figure 2 - Appendix Figure 4In a preferred embodiment of the present invention, the multi-layer control mechanism 2 includes a gear power layer 21, which is threadedly connected to the outer periphery of the fastening bolt 1. A return oil control layer 22 is provided on the top of the gear power layer 21. An oil return layer 23 is slidably connected to the outer side of the fastening bolt 1. An oil circuit output sealing layer 24 is slidably connected to the outer side of the fastening bolt 1. A rotating shaft 25 is rotatably connected inside the gear power layer 21. A power gear 26 is fixedly connected to the outer side of the rotating shaft 25. A rotating shaft 28 is rotatably connected inside the gear power layer 21. A driven gear 27 is fixedly connected to the outer side of the rotating shaft 28. The power gear 26... The gear power layer 21 is meshed with the passive gear 27. A first oil groove 210 and a second oil groove 211 are provided inside the gear power layer 21. Two check valve steel balls 29 are provided inside the gear power layer 21. The rotating shaft 25 and the rotating shaft 28 are rotatably connected inside the shaft hole 611. An oil inlet 5 is provided on the outside of the gear power layer 21. The oil inlet 5 is connected to the second oil groove 211 and the first oil groove 210. The oil circuit output sealing layer 24 is pressed against the top of the return oil layer 23. The first oil circuit 3, the second oil circuit 4 and the oil circuit of the return oil layer 23 are precisely coaxially connected. Specifically, the starting power source drives the rotating shaft 25 in the gear power layer 21 of the multi-layer control mechanism 2 to rotate in the opposite direction. When the rotating shaft 25 rotates, the driving gear 26 and the meshing driven gear 27 rotate synchronously. At this time, hydraulic oil is squeezed from the first oil tank 210 into the second oil tank 211. When passing through the gear meshing point, it is pressed together to form high-pressure oil. At this time, the second oil tank 211 is the outlet oil tank, outputting high-pressure oil. When the high-pressure oil is in the second oil tank 211, it will put pressure on the check valve ball 29 and piston 63 inside the oil tank. At this time, due to the pressure difference between the oil inlet 5 and the upper and lower parts of the first oil tank 210, the check valve ball 29 inside the first oil tank 210 floats up and is in an open state. The pressure of the high-pressure oil inside the second oil tank 211 is greater than that of the hydraulic oil in the oil inlet pipe. The pressure causes the check valve ball 29 in the second oil tank 211 to close. At this time, the high-pressure oil enters the return oil control layer 22 along the interlayer connecting oil passage. The oil is then output to the hydraulic cylinder through the second oil passage 4 of the return oil layer 23 and the oil passage output sealing layer 24. Conversely, if the shaft 25 rotates in the forward direction, the corresponding hydraulic oil will be squeezed from the second oil tank 211 into the first oil tank 210. When passing through the gear meshing point, the oil is pressed together to form high-pressure oil. At this time, the first oil tank 210 is the oil outlet and outputs high-pressure oil. When the high-pressure oil is in the first oil tank 210, it will put pressure on the check valve ball 29 and piston 63 inside the oil tank, causing the check valve ball 29 in the first oil tank 210 to close. At this time, the high-pressure oil is output to the hydraulic cylinder along the interlayer connecting first oil passage 3.

[0023] In this embodiment, when the shaft 25 in the gear power layer 21 is not working, since the diameter of the two check valve steel balls 29 is larger than the diameter of the corresponding oil inlet 5 and is located at the center of the oil inlet 5, the two check valve steel balls 29 will fall into the central notch at the top of the corresponding oil inlet 5 to seal it. When the shaft 25 rotates in the reverse direction, the hydraulic oil entering from the inlet 5 will cause the check valve ball 29 in the first oil groove 210 to float upward. Since the center of the first oil passage 3 and the second oil passage 4 of the return oil control layer 22 is misaligned with the center of the inlet 5 at the bottom of the first oil groove 210 and the second oil groove 211, and the diameter of the check valve ball 29 is greater than the height of the first oil groove 210, the check valve ball 29 will not enter the first oil passage 3 in the return oil control layer 22 when it floats upward. It will only touch the bottom edge of the first oil passage 3 in the return oil control layer 22, thus preventing the check valve ball 29 from sliding into the gear chamber and the first oil passage 3 in the return oil control layer 22. At the same time, there is a gap between the check valve ball 29 in the first oil groove 210 and the bottom inlet 5, and oil can enter through the periphery of the check valve ball 29.

[0024] When the hydraulic oil in the first oil tank 210 enters the second oil tank 211 after the high-pressure oil formed by gear meshing, the check valve steel ball 29 has a larger diameter than the corresponding oil inlet 5. Therefore, the check valve steel ball 29 on this side will seal the corresponding oil inlet 5 under the pressure of the high-pressure oil. When the shaft 25 rotates forward, the check valve steel ball 29 in the second oil tank 211 will float up and touch the edge of the oil passage of the second oil circuit 4. At the same time, the hydraulic oil in the second oil tank 211, after the high-pressure oil formed by gear meshing, enters the first oil tank 210, will seal the corresponding oil inlet 5.

[0025] Please see the appendix Figure 5 - Appendix Figure 9 In a preferred embodiment of the present invention, the pressure regulating mechanism 6 includes an overflow valve adjusting screw 64, which is threadedly connected inside the oil return control layer 22. A second spring 65 is fixedly connected to the top of the overflow valve adjusting screw 64, and a second steel ball 67 is fixedly connected to the other end of the second spring 65. An oil drain channel 66 is provided inside the oil return control layer 22. Two pistons 63 are slidably connected inside the oil return layer 22. A first spring 61 is fixedly connected to the inner side of the oil return layer 23, and a first steel ball 62 is fixedly connected to the bottom of the first spring 61. A second steel ball 67 is fixedly connected to the inner side of the oil return layer 23. Three springs 68, with a third steel ball 69 fixedly connected to the bottom of the third spring 68; an oil return groove 610 is provided inside the oil return layer 23; two shaft holes 611 are provided at the bottom of the oil return control layer 22; a small hole communicating with the gear power layer 21 is provided at the bottom of the piston 63; the top of the piston 63 is in contact with the third steel ball 69; the first steel ball 62 abuts against the top of the oil return control layer 22; the third steel ball 69 is slidably connected inside the oil return layer 23; the overflow valve adjusting screw 64 is elastically linked with the second spring 65; the pressure is adjusted by changing the preload of the second spring 65 by turning the overflow valve adjusting screw 64. Specifically, when the shaft 25 in the gear power layer 21 rotates in the reverse direction, the high-pressure oil supplied by the gear power layer 21 enters the return oil control layer 22 along the interlayer connecting oil passage. At this time, the oil passage is divided into two parts. One part of the oil passage enters the piston 63 cavity through the small hole at the bottom and pushes the piston 63 up. At this time, the protrusion on the top of the piston 63 will move upward and squeeze the third steel ball 69 at the top. Before the piston 63 is pushed up, the third steel ball 69 is squeezed close to the top of the piston 63 by the third spring 68. When the third steel ball 69 at the top of the piston 63 is squeezed by the protrusion on the top of the piston 63, it can overcome the weight of the third steel ball 69 itself and the elastic potential energy of the third spring 68, so that the third steel ball 69 moves upward. At this time, the outer periphery of the third steel ball 69 is not in contact with the piston. The oil circuits are in contact with each other and have a gap. Because the first steel ball 62 at the bottom of the first oil circuit 3 is in a closed state, the oil entering the first oil circuit 3 will fall through the return oil groove 610 into the channel where the third steel ball 69 is located on the other side, and then flow into the drain channel 66 through the third steel ball 69 and the surrounding area of ​​the protrusion on the top of the piston 63. Since the bottom of the piston 63 is formed by high-pressure oil after meshing and pressing, the oil pressure of this high-pressure oil is greater than the oil pressure of the return oil part at the top of the piston 63, so that the piston 63 is continuously in a raised state, ensuring that the return oil continues and is finally discharged through the drain channel 66, completing the return oil operation. Another part of the oil circuit enters the return oil control layer 22. Because the first steel ball 62 seals the top of the return oil control layer 22, it can only be returned when the oil is output. The oil layer 23 moves up and down inside, and the diameter of the first steel ball 62 is larger than the diameter of the bottom protrusion of the return oil layer 23, but smaller than the diameter of the middle part of the second oil passage 4 in the return oil layer 23. Therefore, after the high-pressure oil enters the second oil passage 4 inside the return oil control layer 22, it squeezes the first steel ball 62 at the top. After being squeezed by the high-pressure oil, the first steel ball 62 will rise and compress the first spring 61. At this time, the high-pressure oil enters the return oil layer 23 and is then discharged through the second oil passage 4 in the sealing layer 24 via the top-connected oil passage. Conversely, when the shaft 25 rotates forward, a portion of the high-pressure oil enters the corresponding piston 63 cavity through the small hole at the bottom, lifting the piston 63 and causing the third steel ball 69 at the top to be pushed open by the protrusion at the top of the piston 63. The second oil passage 4 performs the return oil operation; another part of the high-pressure oil enters the first oil passage 3 inside the return oil control layer 22 and squeezes the corresponding first steel ball 62 at the top, causing the first spring 61 to squeeze and compress. Then the high-pressure oil enters the return oil layer 23 and is discharged through the first oil passage 3 in the top-connected oil passage sealing layer 24. At this time, the first oil passage 3 is the oil outlet and the second oil passage 4 is the return oil passage, thus forming a complete internal oil inlet and power output basic structure. When the work stops, the first spring 61 and the third spring 68 will squeeze the first steel ball 62 and the third steel ball 69 at the bottom downwards, causing the first steel ball 62 and the third steel ball 69 to be stuck at the bottom of the return oil layer 23 and block the oil passage between the return oil layer 23 and the return oil control layer 22. During this operation, depending on the pressure of the high-pressure oil to be discharged, the second spring 65 can be squeezed or stretched by rotating the overflow valve adjusting screw 64 in the forward or reverse direction, thereby compressing or releasing the pressure of the second spring 65. This prevents the high-pressure oil with the required pressure from squeezing the second steel ball 67. Only high-pressure oil with a pressure higher than the required pressure can squeeze the second steel ball 67 in the two oil circuits, connecting the oil drain channel 66 with the first oil circuit 3 or the second oil circuit 4. This allows some of the high-pressure oil in the first oil circuit 3 or the second oil circuit 4 to be discharged from the oil drain channel 66 for pressure relief.

[0026] Working principle: First, the equipment is fixed in sequence using fastening bolts 1. Then, the power source is started, driving the rotating shaft 25 in the gear power layer 21 of the multi-layer control mechanism 2 to rotate in the opposite direction. When the rotating shaft 25 rotates, the power gear 26 and the meshing passive gear 27 rotate synchronously. At this time, hydraulic oil is squeezed from the first oil tank 210 into the second oil tank 211. When passing through the gear meshing point, it is pressed together to form high-pressure oil. The second oil tank 211 is the outlet for high-pressure oil. When the high-pressure oil is in the second oil tank 211, it will pressurize the check valve ball 29 and piston 63 inside the oil tank. At this time, due to the pressure difference between the oil inlet 5 and the upper and lower parts of the first oil tank 210, the check valve ball 29 inside the first oil tank 210 moves upward and opens. Because the pressure of the high-pressure oil inside the second oil tank 211 is greater than the pressure of the hydraulic oil in the oil inlet pipe, the check valve ball 29 in the second oil tank 211 is pressed downward and closed. At this time, the oil circuit is divided into two parts. One part of the oil circuit passes through a small hole connected at the bottom. The piston 63 is lifted by the piston 63 cavity, which pushes open the third steel ball 69 at the top of the piston 63, ensuring that the first oil passage 3 can return oil. Since the first steel ball 62 at the bottom of the first oil passage 3 is in a closed state, the oil entering the first oil passage 3 will fall into the channel where the third steel ball 69 is located on the other side through the return oil groove 610, and flow into the drain channel 66 through the third steel ball 69 and the area around the top protrusion of the piston 63, and finally be discharged through the drain channel 66, completing the return oil operation. Another part of the oil passage enters the second oil passage 4 inside the return oil control layer 22 and squeezes the first steel ball 62 at the top. After being squeezed by the high pressure oil, the first steel ball 62 will rise and squeeze and compress the first spring 61. At this time, the high pressure oil enters the return oil layer 23 and is then discharged through the oil passage connected to the top of the second oil passage 4 in the sealing layer 24. Conversely, when the power gear 26 rotates forward, the first oil passage 3 is the oil outlet and the second oil passage 4 is the oil return.

[0027] When the high-pressure oil pressure is too high, a portion of the high-pressure oil will be diverted again into the second oil circuit 4. This diverted high-pressure oil will squeeze the second steel ball 67, connecting the oil drain channel 66 and the second oil circuit 4, thereby relieving the pressure of the high-pressure oil in the second oil circuit 4. When the pressure decreases, the second steel ball 67 will gradually return to its original position due to the reset action of the second spring 65, until the connection between the oil drain channel 66 and the second oil circuit 4 is closed. Depending on the pressure of the high-pressure oil to be discharged, the second spring 65 can be squeezed or stretched by rotating the overflow valve adjusting screw 64 in the forward or reverse direction, thereby compressing or releasing the pressure of the second spring 65. This ensures that the high-pressure oil with the required pressure cannot squeeze the second steel ball 67, and only high-pressure oil with a pressure higher than the required pressure can squeeze the second steel ball 67 and perform the pressure relief operation.

[0028] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-layer bidirectional self-locking hydraulic pump, comprising fastening bolts (1), characterized in that, The fastening bolt (1) is provided with a multi-layer control mechanism (2) on the outside. The multi-layer control mechanism (2) is used to integrate hydraulic power and pressure control, eliminating external components. The multi-layer control mechanism (2) is provided with a pressure regulating mechanism (6) inside. The pressure regulating mechanism (6) is used to control the pressure in the oil circuit.

2. The multi-layer bidirectional self-locking hydraulic pump according to claim 1, characterized in that, The multi-layer control mechanism (2) includes a gear power layer (21), which is threaded to the outer periphery of the fastening bolt (1). A return oil control layer (22) is provided on the top of the gear power layer (21). A return oil layer (23) is slidably connected to the outside of the fastening bolt (1). An oil circuit output sealing layer (24) is slidably connected to the outside of the fastening bolt (1). A rotating shaft (25) is rotatably connected inside the gear power layer (21). A power tooth (26) is fixedly connected to the outside of the rotating shaft (25). A rotating shaft (28) is rotatably connected inside the gear power layer (21). A passive tooth (27) is fixedly connected to the outside of the rotating shaft (28). The power tooth (26) and the passive tooth (27) mesh with each other. A first oil groove (210) is opened inside the gear power layer (21). A second oil groove (211) is opened inside the gear power layer (21). Two check valve steel balls (29) are provided inside the gear power layer (21).

3. A multi-layer bidirectional self-locking hydraulic pump according to claim 2, characterized in that, The oil return control layer (22), the oil return layer (23) and the oil output sealing layer (24) are all provided with a first oil passage (3), and the oil return control layer (22), the oil return layer (23) and the oil output sealing layer (24) are all provided with a second oil passage (4).

4. A multi-layer bidirectional self-locking hydraulic pump according to claim 2, characterized in that, The pressure regulating mechanism (6) includes an overflow valve adjusting screw (64), which is threadedly connected inside the oil return control layer (22). A second spring (65) is fixedly connected to the top of the overflow valve adjusting screw (64), and a second steel ball (67) is fixedly connected to the other end of the second spring (65). An oil drain channel (66) is opened inside the oil return control layer (22). Two pistons (63) are slidably connected inside the oil return control layer (22). A first spring (61) is fixedly connected to the inside of the oil return layer (23), and a first steel ball (62) is fixedly connected to the bottom of the first spring (61). A third spring (68) is fixedly connected to the inside of the oil return layer (23), and a third steel ball (69) is fixedly connected to the bottom of the third spring (68). An oil return groove (610) is opened inside the oil return layer (23), and two shaft holes (611) are opened at the bottom of the oil return control layer (22).

5. A multi-layer bidirectional self-locking hydraulic pump according to claim 4, characterized in that, Both the rotating shaft (25) and the rotating shaft (28) are rotatably connected inside the shaft hole (611), and an oil inlet (5) is provided on the outside of the gear power layer (21).

6. A multi-layer bidirectional self-locking hydraulic pump according to claim 5, characterized in that, The oil inlet (5) is connected to the second oil tank (211), and the oil inlet (5) is connected to the first oil tank (210).

7. A multi-layer bidirectional self-locking hydraulic pump according to claim 4, characterized in that, The first steel ball (62) abuts against the top of the oil return control layer (22), and the third steel ball (69) is slidably connected inside the oil return layer (23).

8. A multi-layer bidirectional self-locking hydraulic pump according to claim 4, characterized in that, The piston (63) has a small hole at the bottom that communicates with the gear power layer (21), and the top of the piston (63) is in contact with the third steel ball (69).

9. A multi-layer bidirectional self-locking hydraulic pump according to claim 3, characterized in that, The oil circuit output sealing layer (24) is pressed onto the top of the return oil layer (23), and the first oil circuit (3), the second oil circuit (4) and the oil circuit of the return oil layer (23) are precisely coaxially connected.

10. A multi-layer bidirectional self-locking hydraulic pump according to claim 4, characterized in that, The overflow valve adjusting screw (64) is elastically linked with the second spring (65). By turning the overflow valve adjusting screw (64), the preload of the second spring (65) is changed to adjust the pressure.

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