Inclined shaft type plunger hydraulic pump

Abstract

The invention relates to the technical field of plunger hydraulic pumps, in particular to an inclined shaft type plunger hydraulic pump which comprises a shell and a main shaft, the main shaft penetrates through the shell and extends into the shell, a bearing is fixedly installed on the inner wall of the shell, the inner wall of the bearing is fixedly connected with the main shaft, and a rotating disc is fixedly installed on the surface of the main shaft. A fixed sleeve is arranged in the shell, a valve plate is fixedly installed at one end of the fixed sleeve, a cylinder body is rotatably installed in the fixed sleeve, a plurality of piston cavities are formed in the surface of the cylinder body, a piston rod is connected into each piston cavity in a sleeved mode, the piston rods are hinged to the surface of a rotary plate, and the outer wall of the fixed sleeve is connected with a protective sleeve in a sleeved mode. A suction pipe and an output pipe are arranged on the surface of the valve plate, and a suction port and an output port are formed in the surface of the shell. Supporting force is provided for the cylinder body all the time through the adjusted first telescopic rod, and it is guaranteed that the cylinder body can be effectively supported when the cylinder body is adjusted to any working angle.

Description

Technical Field

[0001] The invention relates to the technical field of plunger hydraulic pumps, in particular to a bent-axis plunger hydraulic pump. Background Art

[0002] With the continuous advancement of science and technology and social development, hydraulic pumps are applied to various fields, such as mechanical processing and agricultural machinery. Hydraulic pumps are an important component of some equipment and provide power for the transmission parts of the equipment. The inclined-axis plunger hydraulic pump has been gradually replacing traditional hydraulic pumps in some fields due to its compact structure, small size and high efficiency. It is widely used. The output power of the inclined-axis plunger hydraulic pump needs to be adjusted in different working scenarios to adapt to various working conditions. At this time, the adjustment mechanism inside the inclined-axis plunger hydraulic pump is needed to adjust the flow rate by changing the swing angle of the cylinder by moving the cylinder. The device can not only adjust the swing angle of the cylinder, but also ensure that the outer wall of the cylinder can be effectively supported when it is at any working angle, thereby ensuring the stability of the cylinder when working.

[0003] The cylinder of the inclined axis plunger hydraulic pump is always in a rotating state during operation. Due to the centrifugal force generated by the rotation and the influence of its own gravity, the cylinder will shake during operation. The connection with the adjustment device alone is not enough to effectively support the cylinder. The outer wall of the cylinder cannot be supported around. Under long-term shaking, the wear of internal parts will be aggravated, affecting the service life. For example, the invention patent with patent publication number CN110685879A discloses a variable mechanism of an inclined axis plunger pump with continuous proportional flow regulation. By using a roller screw as a variable mechanism and a servo motor, the control accuracy and flow control can be improved. The accuracy of the system is improved. However, the centrifugal force generated by the rotation of the cylinder body during operation in this invention will cause the cylinder body to shake. Relying solely on the ball nut as a fulcrum is not enough to form an effective wrapping and supporting force for the surface of the cylinder body. The shaking of the cylinder body will intensify the vibration and wear between the plunger and the cylinder body, shortening the service life of the device; moreover, after the swing angle of the cylinder body is adjusted by moving the ball nut, the combined forces of gravity, centrifugal force during rotation, etc. are concentrated on the surface of the ball nut, and the stress is too concentrated. After long-term use of the device, it is easy to cause wear and loosening between the ball screw and the coupling, affecting the connectivity between the ball screw and the shaft end of the servo motor, and affecting the functionality of the device.

[0004] Therefore, a bent axis plunger hydraulic pump is proposed to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a bent-axis plunger hydraulic pump, which, by arranging a worm gear and a support assembly and utilizing the self-locking characteristics of the worm gear and the follow-up performance of the support mechanism, enables the cylinder body to obtain effective supporting force when adjusted to any angle, thereby solving the problem that the inclined-axis plunger hydraulic pump adjustment mechanism is difficult to provide effective supporting force to the surface of the cylinder body after adjusting the angle of the cylinder body.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A bevel-axis plunger hydraulic pump comprises a housing, a main shaft, a bearing, a turntable, a fixed sleeve, a distribution plate, a cylinder body, a piston chamber, a piston rod, a suction pipe, an output pipe, a suction port, an output port, a first limit screw, a second limit screw, and also comprises a worm, a worm wheel, a lifting rod, a sleeve, a supporting mechanism, and an oil valve. The worm is rotatably mounted inside the housing, and the worm wheel is rotatably mounted inside the housing near the worm. The worm is meshed with the surface of the worm wheel, and the sleeve is sleeved on the surface of the fixed sleeve. One end of the lifting rod is fixedly mounted on the surface of the worm wheel, and the other end is fixedly connected to the fixed sleeve. One end of the supporting structure is hinged inside the housing, and the other end is hinged to the fixed sleeve. The oil valve is arranged inside the housing and connected to an external oil tank. A connecting pipe is connected to the surface of the oil valve, and the oil valve is connected to the supporting mechanism through the connecting pipe. Rotating the worm can control the oil valve to adjust the telescopic length of the supporting mechanism and the size of the gap between the sleeve and the fixing sleeve.

[0008] Preferably, the supporting mechanism comprises a first telescopic rod, a fixed end of the first telescopic rod is hinged inside the shell, and a free end is hinged to a fixed sleeve, a valve is arranged on the surface of the oil valve, a knob is rotatably mounted on the surface of the worm, a torsion spring and a limit block are arranged between the knob and the worm, a push rod is slidably mounted on the inner wall of the worm, an elastic part is arranged between the push rod and the worm, the push rod is fixedly connected to the valve, an arc plate is fixedly mounted on the inner wall of the knob, and the arc plate is arranged in a conical shape.

[0009] In the above scheme, the push rod is driven to move by rotating the knob to control the opening and closing of the valve on the surface of the oil valve, thereby controlling the connection state between the first telescopic rod and the external oil tank. When the cylinder body adjusts the angle to move, the first telescopic rod hinged at both ends can change its own rotation angle as the fixed sleeve deflects, and adjust the telescopic amount as the distance between the fixed sleeve changes, which is beneficial to the connectivity between the first telescopic rod and the fixed sleeve.

[0010] Preferably, a second telescopic rod is provided at the bottom of the sleeve, the fixed end of the second telescopic rod is slidably mounted on the inner wall of the shell, the free end sleeve is spherically hinged, the inner wall of the sleeve is provided with a first inclined surface, the surface of the fixed sleeve is provided with a second inclined surface, and there is a gap between the first inclined surface and the second inclined surface, an oil bag is fixedly installed on the inner wall of the sleeve, the oil bag is connected with the connecting pipe, the second telescopic rod is connected with the oil bag, and the inner wall of the sleeve and the outer wall of the fixed sleeve are both in contact with the surface of the oil bag.

[0011] In the above scheme, the sheath is sleeved on the surface of the fixed sleeve, and through the support of the second telescopic rod, the outer surface of the fixed sleeve is well wrapped and supported, which helps the fixed sleeve to overcome the shaking caused by the centrifugal force generated when the cylinder body rotates, and ensures stability during operation. By setting the outer wall of the fixed sleeve and the inner wall of the sheath to be inclined, the gap between the sheath and the fixed sleeve will become smaller when the sheath slides on the surface of the fixed sleeve, and the oil bag is used as the contact medium, which is beneficial for the sheath to wrap the fixed sleeve.

[0012] Preferably, a reinforcing rib is sleeved between the hinge between the first telescopic rod and the housing and the worm gear, forming a triangular supporting structure with the lifting rod and the first telescopic rod.

[0013] In the above solution, the reinforcement ribs, the lifting rod and the first telescopic rod together form a triangular support structure. Since the triangle has stability, the reinforcement ribs can improve the supporting effect of the lifting rod and the first telescopic rod on the fixing sleeve.

[0014] Preferably, the connections between the lifting rod, the supporting mechanism and the fixing sleeve are aligned with the midpoint of the central axis of the fixing sleeve.

[0015] In the above scheme, the fulcrum positions of the lifting rod, the supporting mechanism and the fixed sleeve and the center of gravity of the fixed sleeve are aligned, which can offset the gravity borne by the surface of the fixed sleeve to the maximum extent, help the lifting rod and the supporting mechanism to support the fixed sleeve and improve the supporting effect.

[0016] Preferably, a bellows is provided on the inner wall of the shell near the suction pipe and the discharge pipe, one end of the bellows is fixedly mounted on the inner wall of the shell, and the other end is fixedly mounted with a support ring, and the support ring is fixedly connected to the sheath.

[0017] In the above scheme, the bellows is connected to the sleeve through a support ring. The sleeve pulls the bellows when it moves on the surface of the fixed sleeve. Since the surface of the bellows can be stretched and deformed, the suction pipe and the output pipe are supported and moved simultaneously during the deformation process, which effectively avoids the suction pipe and the output pipe from bending asynchronously and deforming violently at both ends of the surface, and avoids affecting the cylinder body's suction and output resistance to the oil.

[0018] Preferably, the second telescopic rod and the central axis of the sheath are in the same vertical plane, and the second telescopic rod is perpendicular to the horizontal plane.

[0019] In the above scheme, the second telescopic rod is aligned with the vertical plane where the central axis of the sleeve is located, so that the sleeve always slides regularly in a straight line on the surface of the fixed sleeve, ensuring the contact effect between the sleeve and the fixed sleeve through the oil bag, making the force between the sleeve and the fixed sleeve uniform, and ensuring the wrapping performance.

[0020] Preferably, the first inclined surface and the second inclined surface have opposite inclination directions, and the first inclined surface and the second inclined surface are not parallel.

[0021] In the above scheme, the inner wall of the sleeve and the outer wall of the fixed sleeve are designed to be non-parallel. When the angle of the fixed sleeve is adjusted counterclockwise, the sleeve slides along the surface of the fixed sleeve toward the main axis, and the gap between the first inclined surface and the second inclined surface can be gradually reduced. At the same time, the hydraulic oil in the oil bag is also reduced, thereby improving the supporting effect of the sleeve on the fixed sleeve.

[0022] Preferably, the length of the reinforcing rib is fixed, and the maximum length of the first telescopic rod is equal to the length of the lifting rod.

[0023] In the above scheme, when the cylinder body is adjusted to the maximum height, the center of gravity is at the highest point, and the length of the first telescopic rod reaches the maximum value. At this time, the length of the first telescopic rod is equal to the length of the lifting rod, and forms an isosceles triangle with the reinforcing rib. At this time, the supporting effect on the cylinder body is optimal, ensuring that the cylinder body still has a good supporting effect after the center of gravity of the cylinder moves upward.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The inclined axis plunger hydraulic pump adjusts the working angle of the cylinder body by rotating the worm to drive the worm wheel. The first telescopic rod will change its telescopic length and rotation angle as the angle of the cylinder body changes. After the angle adjustment is completed, the one-way self-locking characteristics of the worm wheel and the worm fix the cylinder body. The adjusted first telescopic rod still provides support for the cylinder body, ensuring that the cylinder body can be effectively supported when adjusted to any working angle, ensuring work efficiency, and the worm wheel and the first telescopic rod disperse the combined forces of gravity, centrifugal force, etc. when the cylinder body is working, avoiding stress concentration on a certain part, reducing part loss, and extending the service life of the device.

[0026] 2. The inclined axis plunger hydraulic pump, the sleeve and the support rod improve the supporting effect on the cylinder body, and as the cylinder body is lifted upward, the position of the sleeve will shift. The smaller the gap between the sleeve and the fixed sleeve outside the cylinder body, the better the wrapping and supporting effect of the fixed sleeve and the cylinder body, and the clamping effect of the fixed sleeve is improved under the fitting of the oil bag. The more the center of gravity of the cylinder body shifts upward, the greater the supporting force is, ensuring that the cylinder body can work more stably.

[0027] 3. For this inclined axis plunger hydraulic pump, when the sleeve is offset on the surface of the fixed sleeve, it drives the bellows to expand and contract. By changing the expansion and contraction and bending degree of the bellows, the suction pipe and the output pipe under different working conditions can maintain a smooth and relaxed bending degree, avoiding the influence of severe bending due to the angle adjustment of the cylinder body on the suction and output resistance of the device to the oil, thereby ensuring the working efficiency of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the present invention;

[0029] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0030] Figure 3 It is a schematic diagram of the main shaft and bearing position structure of the present invention;

[0031] Figure 4 It is a schematic diagram of the position structure of the suction port, the discharge port and the shell of the present invention;

[0032] Figure 5 It is a schematic diagram of the position structure of the cylinder body and the fixed sleeve of the present invention;

[0033] Figure 6 It is a schematic diagram of the position structure of the knob and the push rod of the present invention;

[0034] Figure 7 It is a schematic diagram of the position structure of the first inclined plane and the second inclined plane of the present invention;

[0035] Figure 8 It is a schematic diagram of the position structure of the bellows and the shell of the present invention.

[0036] In the figure: 1. shell; 2. main shaft; 3. bearing; 4. turntable; 5. fixed sleeve; 6. distribution plate; 7. cylinder body; 71. piston chamber; 8. piston rod; 9. sleeve; 10. suction pipe; 11. output pipe; 12. suction port; 13. output port; 14. worm gear; 15. lifting rod; 16. worm; 17. first telescopic rod; 18. oil valve; 19. valve; 20. connecting pipe; 21. knob; 22. arc plate; 23. push rod; 24. second telescopic rod; 25. oil bag; 26. first inclined plane; 27. second inclined plane; 28. bellows; 29. ​​support ring; 30. reinforcing rib; 31. first limit screw; 32. second limit screw; 33. limit block; 34. torsion spring; 35. elastic member. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] See also Figures 1 to 8 The present invention provides a bent axis plunger hydraulic pump, and the technical solution is as follows:

[0039] A bevel-axis plunger hydraulic pump, comprising a housing 1, a main shaft 2, a bearing 3, a rotating plate 4, a fixed sleeve 5, a distribution plate 6, a cylinder body 7, a piston chamber 71, a piston rod 8, a suction pipe 10, an output pipe 11, a suction port 12, an output port 13, a first limit screw 31, a second limit screw 32, and also comprising a worm 16, a worm wheel 14, a lifting rod 15, a sleeve 9, a supporting mechanism, and an oil valve 18. The worm 16 is rotatably mounted inside the housing 1, and the worm wheel 14 is rotatably mounted inside the housing 1 near the worm 16. The worm 16 and the worm wheel 1 4 surfaces are meshed, the sheath 9 is sleeved on the surface of the fixed sleeve 5, one end of the lifting rod 15 is fixedly mounted on the surface of the worm wheel 14, and the other end is fixedly connected to the fixed sleeve 5, one end of the supporting structure is hinged inside the housing 1, and the other end is hinged to the fixed sleeve 5, an oil valve 18 is arranged inside the housing 1 and connected to the external oil tank, a connecting pipe 20 is connected on the surface of the oil valve 18, and the oil valve 18 is connected to the supporting mechanism through the connecting pipe 20, and the worm 16 can be rotated to control the oil valve 18 to adjust the telescopic length of the supporting mechanism and the gap between the sheath 9 and the fixed sleeve 5.

[0040] Rotating the worm 16 drives the worm wheel 14 to rotate, and the rotation of the worm wheel 14 causes the lifting rod 15 to rotate, pushing the cylinder body 7 to adjust the angle. After the cylinder body 7 completes the angle adjustment, the worm 16 is released. Due to the self-locking characteristics between the worm 16 and the worm wheel 14, the lifting rod 15 can be fixed, thereby providing a part of the supporting force for the cylinder body 7. One end of the supporting structure is hinged inside the shell 1, and the other end is hinged to the fixed sleeve 5. Both ends of the supporting mechanism are hinged and are of retractable design. They can move with the swing of the cylinder body 7 to adapt to the angle change of the cylinder body 7.

[0041] As an embodiment of the present invention, Figure 3 and Figure 6, the supporting mechanism includes a first telescopic rod 17, the fixed end of the first telescopic rod 17 is hinged inside the shell 1, and the free end is hinged to the fixed sleeve 5. The free end of the first telescopic rod 17 can move with the fixed sleeve 5. When the cylinder body 7 completes the adjustment and the fixed sleeve 5 stops moving, the first telescopic rod 17 also stops moving, but in order to adapt to the position change of the fixed sleeve 5, its own length and rotation angle are adjusted. A valve 19 is provided on the surface of the oil valve 18. The valve 19 controls the connection state between the first telescopic rod 17 and the external oil tank. Only when the first telescopic rod 17 is connected to the external oil tank can the hydraulic oil be sucked in or discharged to adjust the length. A knob 21 is rotatably installed on the surface of the worm 16, and a torsion spring 34 and a limit block 33 are arranged between the knob 21 and the worm 16. A push rod 23 is slidably installed on the inner wall of the worm 16, and an elastic member 35 is arranged between the push rod 23 and the worm 16. The push rod 23 is fixedly connected to the valve 19, and the rotation An arc plate 22 is fixedly installed on the inner wall of the button 21. The arc plate 22 is set in a conical shape. The interior of the worm 16 is hollow, and the push rod 23 slidably installed inside is fixedly connected to the valve 19. The valve 19 is opened and closed by the movement of the push rod 23. When the knob 21 is rotated, the arc plate 22 is driven to rotate. The arc plate 22 is of a conical design, and the two sides close to the push rod 23 are inclined surfaces. When the arc plate 22 rotates, it contacts and squeezes the push rod 23 to move, pushing the valve 19 to make the oil valve 18 connect the first telescopic rod 17 and the external oil tank. At this time, the first telescopic rod 17 adjusts its length by sucking hydraulic oil from the external oil tank or discharging hydraulic oil to the external oil tank. Loosen the knob 21, the knob 21 is reset under the elastic force of the torsion spring 34, and the push rod 23 is no longer squeezed. The push rod 23 also drives the valve 19 to reset under the elasticity of the elastic member 35, and closes the oil valve 18, so that the first telescopic rod 17 can maintain a fixed posture, which has a supporting effect on the fixed sleeve 5.

[0042] As an embodiment of the present invention, reference Figure 3 A limit block 33 is provided on the surface of the worm 16 near the knob 21. When the knob 21 is rotated for a certain distance and the oil valve 18 is opened, the knob 21 will contact the limit block 33. The knob 21 is blocked by the limit block 33, which will drive the worm 16 to rotate together. The rotation of the worm 16 will drive the worm wheel 14 to rotate, and the angle of the cylinder body 7 will begin to be adjusted. After the knob 21 is released, the worm 16 also stops rotating, and the cylinder body 7 is fixed by the self-locking characteristic.

[0043] As an embodiment of the present invention, reference Figure 5 and Figure 7A second telescopic rod 24 is provided at the bottom of the sheath 9. The fixed end of the second telescopic rod 24 is slidably mounted on the inner wall of the shell 1. The free end is spherically hinged with the sheath 9. The sheath 9 forms a surrounding protective layer on the outer wall of the fixed sleeve 5 to enhance the wrapping and support of the fixed sleeve 5. The cylinder body 7 generates centrifugal force when rotating, causing the fixed sleeve 5 to shake. The sheath 9 supports the fixed sleeve 5 to ensure its stability. Since the second telescopic rod 24 is also hinged at the bottom of the sheath 9, when the fixed sleeve 5 is angled, During adjustment, the sheath 9 will slide along the surface of the fixed sheath 5. When the fixed sheath 5 is adjusted counterclockwise, the sheath 9 moves along the fixed sheath 5 toward the direction close to the piston rod 8, and vice versa. The inner wall of the sheath 9 is provided with a first inclined surface 26, and the surface of the fixed sheath 5 is provided with a second inclined surface 27, and there is a gap between the first inclined surface 26 and the second inclined surface 27. An oil bag 25 is fixedly installed on the inner wall of the sheath 9, and the oil bag 25 is connected to the connecting pipe 20. The second telescopic rod 24 is connected to the oil bag 25. When the oil valve 18 is opened, , the second telescopic rod 24 becomes movable, the sheath 9 can also slide on the surface of the fixed sheath 5, the oil bag 25 can change its shape to adapt to the change in the distance between the sheath 9 and the fixed sheath 5, the inner wall of the sheath 9 and the outer wall of the fixed sheath 5 are both in contact with the surface of the oil bag 25, the first inclined surface 26 and the second inclined surface 27 are inclined in opposite directions, and the first inclined surface 26 and the second inclined surface 27 are not parallel, the outer wall of the fixed sheath 5 and the inner wall of the sheath 9 are designed to be uneven inclined surfaces, and when the cylinder body 7 is adjusted counterclockwise, the greater the angle When the sleeve 9 slides, the greater the distance the sleeve 9 slides, the smaller the gap between the first inclined surface 26 and the second inclined surface 27 is. By squeezing the oil bag 25, the hydraulic oil in the oil bag 25 is reduced, the supporting effect is improved, and the clamping effect of the sleeve 9 on the fixed sleeve 5 is better. The second telescopic rod 24 and the central axis of the sleeve 9 are in the same vertical plane, so that the sleeve 9 slides linearly along the surface of the fixed sleeve 5. The second telescopic rod 24 is perpendicular to the horizontal plane and is aligned with the center of gravity of the sleeve 9 as much as possible to provide better support for the sleeve 9.

[0044] As an embodiment of the present invention, reference Figure 2 A reinforcing rib 30 is sleeved between the hinge between the first telescopic rod 17 and the shell 1 and the worm gear 14, forming a triangular support structure with the lifting rod 15 and the first telescopic rod 17. According to the stable support structure of the triangle, the reinforcing rib 30 is arranged to make the lifting rod 15 and the first telescopic rod 17 have a better supporting effect on the fixed sleeve 5. The length of the reinforcing rib 30 is fixed, and the maximum length of the first telescopic rod 17 is equal to the length of the lifting rod 15. When the first telescopic rod 17 is extended to the maximum length as the angle of the fixed sleeve 5 is adjusted, it forms an isosceles triangle with the lifting rod 15 and the reinforcing rib 30. At this time, the supporting effect on the fixed sleeve 5 is the best.

[0045] As an embodiment of the present invention, reference Figure 8A bellows 28 is provided at the inner wall of the shell 1 near the suction pipe 10 and the output pipe 11. One end of the bellows 28 is fixedly installed on the inner wall of the shell 1, and a support ring 29 is fixedly installed on the other end. The support ring 29 is fixedly connected to the sleeve 9. Due to the material characteristics of the bellows 28 that can be deformed and contracted, the bellows 28 is connected to the sleeve 9 through the support ring 29. When the sleeve 9 moves, the bellows 28 follows the sleeve 9 to expand and contract. During the deformation process, the suction pipe 10 and the output pipe 11 are supported, which can avoid severe bending of the suction pipe 10 and the output pipe 11 and avoid affecting the suction and output resistance of the cylinder body 7 to the oil. There is a certain gap between the suction pipe 10, the output pipe 11 and the bellows 28. The aperture of the bellows 28 is larger than the cross-sectional diameter of the suction pipe 10 and the output pipe 11. During the deformation and movement of the bellows 28, the suction pipe 10 and the output pipe 11 will not be squeezed due to the small gap, and stable support is always provided.

[0046] Working principle: when the staff needs to adjust the angle of the cylinder body 7, the knob 21 is rotated. The knob 21 drives the arc plate 22 to rotate when rotating. Since the arc plate 22 is set to a cone shape near the push rod 23, when the arc plate 22 contacts the push rod 23, the inclined cone surface will squeeze and push the push rod 23 to move, and the moving push rod 23 drives the valve 19 to move and open the oil valve 18. After the oil valve 18 is opened, the first telescopic rod 17 is connected with the external oil tank through the connecting pipe 20, and the fixed state of the first telescopic rod 17 on the fixed sleeve 5 is released. Then, when the knob 21 is rotated to a certain distance, it will contact the limit block 33 on the surface of the worm 16. Blocked by the limit block 33, the knob 21 will push the worm 16 to rotate together. Because the worm 16 is meshed with the surface of the worm wheel 14, the worm wheel 14 is pushed to rotate when the worm 16 rotates, and the worm wheel 14 drives the lifting rod 15 on the surface to rotate The lifting rod 15 adjusts the deflection angle of the fixing sleeve 5 to complete the angle adjustment of the cylinder body 7. When the staff adjusts the cylinder body 7 to a suitable working angle, the knob 21 is released. The knob 21 is reset under the elastic force of the torsion spring 34, and the arc plate 22 no longer squeezes the push rod 23. The push rod 23 is also reset under the elastic force of the elastic member 35, and drives the valve 19 to reset. The reset valve 19 blocks the connection between the oil valve 18 and the external oil tank. The hydraulic oil retained in the first telescopic rod 17 provides pressure for the fixation of the first telescopic rod 17. The fixed first telescopic rod 17 provides effective supporting force for the fixing sleeve 5. After releasing the knob 21, the rotation of the worm 16 is also stopped. Because the worm 16 and the worm wheel 14 have a one-way self-locking characteristic, after the worm 16 stops rotating, the worm wheel 14 is stuck, and the lifting rod 15 fixes the fixing sleeve 5 to complete the adjustment of the working angle of the cylinder body 7. At the same time, when the working angle of the cylinder body 7 is adjusted, the first telescopic rod 17 can adjust its own length and direction, and restore the fixed state after the angle adjustment of the cylinder body 7 is completed, so that the cylinder body 7 can provide a stable support effect for the cylinder body 7 and the fixed sleeve 5 at different working angles, thereby ensuring the working efficiency of the device, reducing the vibration of the cylinder body 7, reducing wear, and extending the use and life. In addition, in order to ensure that the output power of the cylinder body 7 is within a controllable range, the angle adjustment range of the cylinder body 7 is limited by setting a first limit screw 31 and a second limit screw 32 on the surface of the shell 1.

[0047] The surface of the fixed sleeve 5 is sleeved with a sleeve 9, the bottom of the sleeve 9 is hinged with a second telescopic rod 24, and the fixed end of the second telescopic rod 24 is slidably installed on the inner wall of the shell 1. The sleeve 9 and the second telescopic rod 24 improve the supporting effect of the fixed sleeve 5 and the cylinder body 7. Since the sheath 9 is sleeved on the surface of the fixed sleeve 5 and the bottom is hinged to the free end of the second telescopic rod 24, when the fixed sleeve 5 is lifted, the sheath 9 will move along the surface of the fixed sleeve 5 toward the direction of the main shaft 2, and the gap between the first inclined surface 26 on the surface of the sheath 9 and the second inclined surface 27 on the surface of the fixed sleeve 5 after the movement becomes smaller. Since the oil bag 25 on the inner wall of the sheath 9 is connected with the connecting pipe 20, when the cylinder body 7 adjusts the angle, it can also change its own shape by sucking out or discharging hydraulic oil to adapt to the change in the gap between the first inclined surface 26 and the second inclined surface 27. As the contact medium between the first inclined surface 26 and the second inclined surface 27, the sheath 9 effectively wraps and supports the fixed sleeve 5. When the gap between the first inclined surface 26 and the second inclined surface 27 is smaller, the supporting effect of the sheath 9 on the fixed sleeve 5 is better. Correspondingly, when the angle of the cylinder body 7 upward adjustment is larger, the supporting force is greater, so as to avoid the displacement of the center of gravity of the cylinder body 7 and affect the working stability of the cylinder body 7.

[0048] Two groups of bellows 28 are arranged on the inner wall of the shell 1. The bellows 28 wrap the suction pipe 10 and the discharge pipe 11, thereby protecting and supporting the suction pipe 10 and the discharge pipe 11. Moreover, one end of the bellows 28 is fixed to the inner wall of the shell 1, and the other end is fixedly connected to the sleeve 9 through a support ring 29. When the angle of the cylinder body 7 is adjusted, the suction pipe 10 and the discharge pipe 11 will move with the position change of the distribution plate 6. The moving sleeve 9 drives the support ring 29 to move, and adjusts the expansion and contraction and bending length of the bellows 28, so that the suction pipe 10 and the discharge pipe 11 are always kept in a gently relaxed bending state, thereby avoiding severe bending of the suction pipe 10 and the discharge pipe 11, which increases the suction and discharge resistance of the device to the oil, and affects the working efficiency of the device.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bent axis plunger hydraulic pump, comprising a housing (1), a main shaft (2), a bearing (3), a rotating plate (4), a fixed sleeve (5), a valve plate (6), a cylinder body (7), a piston chamber (71), a piston rod (8), a suction pipe (10), an output pipe (11), a suction port (12), an output port (13), a first stop screw (31), and a second stop screw (32), characterized in that: The invention also comprises a worm (16), a worm wheel (14), a lifting rod (15), a sleeve (9), a supporting mechanism, and an oil valve (18); the worm (16) is rotatably mounted inside the housing (1); the worm wheel (14) is rotatably mounted inside the housing (1) near the worm (16); the worm (16) is meshed with the surface of the worm wheel (14); the sleeve (9) is sleeved on the surface of the fixed sleeve (5); one end of the lifting rod (15) is fixedly mounted on the surface of the worm wheel (14); and the other end is fixedly mounted on the surface of the fixed sleeve. (5) is fixedly connected, one end of the support structure is hinged inside the housing (1), and the other end is hinged to the fixed sleeve (5), the oil valve (18) is arranged inside the housing (1) and connected to the external oil tank, the surface of the oil valve (18) is connected to a connecting pipe (20), the oil valve (18) is connected to the support mechanism through the connecting pipe (20), and the oil valve (18) can be controlled by rotating the worm gear (16) to adjust the telescopic length of the support mechanism and the size of the gap between the sleeve (9) and the fixed sleeve (5).

2. The bent axis plunger hydraulic pump according to claim 1, characterized in that: The support mechanism comprises a first telescopic rod (17), the fixed end of the first telescopic rod (17) is hinged inside the housing (1), and the free end is hinged to the fixed sleeve (5); a valve (19) is arranged on the surface of the oil valve (18); a knob (21) is rotatably mounted on the surface of the worm (16); a torsion spring (34) and a limit block (33) are arranged between the knob (21) and the worm (16); a push rod (23) is slidably mounted on the inner wall of the worm (16); an elastic member (35) is arranged between the push rod (23) and the worm (16); the push rod (23) is fixedly connected to the valve (19); an arc plate (22) is fixedly mounted on the inner wall of the knob (21); and the arc plate (22) is arranged in a conical shape.

3. The bent axis plunger hydraulic pump according to claim 1, characterized in that: A second telescopic rod (24) is provided at the bottom of the sheath (9); a fixed end of the second telescopic rod (24) is slidably mounted on the inner wall of the housing (1); a free end is spherically hinged to the sheath (9); a first inclined surface (26) is provided on the inner wall of the sheath (9); a second inclined surface (27) is provided on the surface of the fixed sleeve (5); and a gap exists between the first inclined surface (26) and the second inclined surface (27); an oil bag (25) is fixedly mounted on the inner wall of the sheath (9); the oil bag (25) is connected to the connecting pipe (20); the second telescopic rod (24) is connected to the oil bag (25); and the inner wall of the sheath (9) and the outer wall of the fixed sleeve (5) are both in contact with the surface of the oil bag (25).

4. The bent axis plunger hydraulic pump according to claim 2, characterized in that: A reinforcing rib (30) is sleeved between the hinged joint between the first telescopic rod (17) and the housing (1) and the worm gear (14), forming a triangular support structure with the lifting rod (15) and the first telescopic rod (17).

5. The bent axis plunger hydraulic pump according to claim 1, characterized in that: The connection points between the lifting rod (15), the supporting mechanism and the fixing sleeve (5) are all aligned with the midpoint of the central axis of the fixing sleeve (5).

6. The bent axis plunger hydraulic pump according to claim 1, characterized in that: A bellows (28) is provided on the inner wall of the shell (1) near the suction pipe (10) and the discharge pipe (11); one end of the bellows (28) is fixedly mounted on the inner wall of the shell (1); and a support ring (29) is fixedly mounted on the other end; the support ring (29) is fixedly connected to the sheath (9).

7. The bent axis plunger hydraulic pump according to claim 3, characterized in that: The central axis of the second telescopic rod (24) and the sheath (9) are located in the same vertical plane, and the second telescopic rod (24) is perpendicular to the horizontal plane.

8. The bent axis plunger hydraulic pump according to claim 3, characterized in that: The first inclined surface (26) and the second inclined surface (27) have opposite inclination directions, and the first inclined surface (26) and the second inclined surface (27) are not parallel to each other.

9. The bent axis plunger hydraulic pump according to claim 4, characterized in that: The length of the reinforcing rib (30) is fixed, and the maximum length of the first telescopic rod (17) is equal to the length of the lifting rod (15).

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