Self-locking driving device for swash plate of plunger pump

Abstract

The utility model discloses a plunger pump swash plate self-locking driving device which comprises a screw plug and an adjusting screw which are installed at the rear end of a plunger pump body installation hole in a matched mode, a threaded hole which is in threaded connection fit with the adjusting screw is formed in the center of the screw plug, and the front end of the screw plug comprises a sliding cavity connected with the threaded hole. A transmission rod is arranged in the sliding cavity in a sliding mode, the rear end of the transmission rod and the front end of the adjusting screw form limiting fit, a sliding sleeve is arranged between the sliding cavity and the transmission rod in a sliding and sleeving mode, and an elastic component which is connected between the plug and the sliding sleeve in an abutting mode and used for driving the sliding sleeve to move backwards in a reset mode is further arranged between the sliding cavity and the transmission rod. The rear end of the sliding sleeve is provided with a clamping part matched with the transmission rod for clamping, and the inner side of the sliding cavity is provided with a limiting part which is matched with the clamping part of the sliding sleeve and drives the sliding sleeve to be clamped on the transmission rod when the sliding sleeve moves backwards and applies pressure. The utility model provides the self-locking driving device for the swash plate of the plunger pump, which can realize the self-locking of the adjusting screw.

Description

Technical Field

[0001] The utility model relates to a self-locking driving device for a swash plate of a plunger pump. Background Art

[0002] The swash plate axial piston pump is the heart of the hydraulic system and is a device that converts mechanical energy into hydraulic energy. It is widely used in engineering machinery, agricultural machinery, mining machinery, industrial equipment and other fields because of its high power-to-weight ratio, stepless flow regulation, high continuous use pressure, excellent oil absorption performance, high allowable speed, high reliability, long life, high efficiency and energy saving, good sealing, low noise level, and low flow pulsation. When the user designs a hydraulic system, if the pump does not need to work at the maximum displacement, it is necessary to adjust the maximum displacement adjustment structure of the pump so that the pump can work stably at the maximum displacement required.

[0003] The Chinese invention patent application discloses a floating swash plate type plunger pump (CN117514681A) containing a main shaft constant speed driven rotary plate transmission mechanism. The pump is composed of a pump body, a main shaft installed in the pump body, a swash plate, a distribution plate, a cylinder body, a plunger and other components. When working, the main shaft drives the cylinder body to rotate, and also drives the plunger in the cylinder hole to rotate. Under the action of the inclination angle of the swash plate, the plunger produces reciprocating motion in the cylinder hole. The rotational and reciprocating motion of the plunger causes the volume of the cylinder hole sealing working chamber to change continuously, and the oil is sucked in from the oil suction waist-shaped hole of the distribution plate and discharged from the oil discharge waist-shaped hole, realizing the conversion of mechanical energy and hydraulic energy. In addition, the swash plate is also connected to a variable lever, which can change the inclination of the swash plate through the variable lever, thereby changing the movement stroke of the plunger and realizing the adjustment of the displacement. Combined with the attached figure disclosed in the patent Figure 2 It can be seen that the variable lever and the swash plate are connected via a ball head, and the plunger pump also includes a driving device, which is connected to the variable lever and can drive the variable lever to translate, and then drive the swash plate to achieve tilting rotation through the variable lever.

[0004] In the prior art, the driving device of the swash plate usually includes a push rod slidably arranged at the front end of the pump body mounting hole, a screw plug arranged at the rear end of the pump body mounting hole, an adjusting screw, a locking nut, etc. The front end of the adjusting screw and the push rod form a limit fit, the screw plug and the rear end of the mounting hole are screwed together and fixed, the adjusting screw and the screw plug are screwed together, and the locking nut and the adjusting screw are screwed together and cooperate with the screw plug to lock the adjusting screw. During adjustment, the adjusting screw is driven to rotate by the rear end of the adjusting screw, and the adjusting screw generates axial movement by the screw connection structure when rotating. The adjusting screw can drive the push rod and the variable lever to move while moving axially, thereby realizing the driving of the swash plate to tilt and rotate.

[0005] In the prior art swash plate driving device, the adjusting screw needs to be locked by a locking nut after the rotation adjustment is completed to prevent the adjusting screw from rotating automatically under the pressure, causing the swash plate to tilt and rotate automatically, but the operation is inconvenient. Utility Model Content

[0006] The utility model provides a plunger pump swash plate self-locking driving device, which can realize the self-locking of an adjusting screw.

[0007] The utility model provides a plunger pump swash plate self-locking drive device, comprising a screw plug and an adjusting screw installed in cooperation with the rear end of the plunger pump pump body mounting hole, a screw plug, a center of the screw plug is provided with a threaded hole that is threadedly matched with the adjusting screw, and the adjusting screw can be driven to move forward and backward by rotating the adjusting screw relative to the screw plug. The front end of the screw plug comprises a sliding cavity connected to the threaded hole, and a transmission rod is slidably arranged in the sliding cavity. The rear end of the transmission rod and the front end of the adjusting screw form a limiting match. When the adjusting screw moves forward and backward, the transmission rod can also be prompted to move forward and backward through the limiting match between the transmission rod and the adjusting screw when the transmission rod moves forward and backward. A sliding sleeve is provided between the sliding cavity and the transmission rod, and an elastic member is also provided between the sliding cavity and the transmission rod, which abuts between the screw plug and the sliding sleeve and is used to drive the sliding sleeve to reset backward. The rear end of the sliding sleeve is provided with a clamping part that is clamped with the transmission rod, and the inner side of the sliding cavity is provided with a limiting part that is matched with the clamping part of the sliding sleeve and drives the sliding sleeve to be clamped on the transmission rod when the sliding sleeve moves backward and is pressed.

[0008] When the transmission rod moves forward, the clamping part can drive the sliding sleeve to move forward, and at the same time compress the elastic component to increase the elastic force of the elastic component. When the elastic force is greater than the friction force between the sliding sleeve and the transmission rod, sliding occurs between the sliding sleeve and the transmission rod; when the transmission rod moves backward, the clamping part of the sliding sleeve and the limiting part on the inner side of the sliding cavity cooperate to prompt the clamping part to be further clamped on the transmission rod, thereby limiting the backward movement of the transmission rod and preventing the adjusting screw from being subjected to excessive thrust, thereby achieving a self-locking effect.

[0009] Furthermore, the clamping portion includes a plurality of clamping arms uniformly distributed circumferentially at the rear end of the sliding sleeve, so that the force between the clamping arms and the transmission rod is more uniform, and slots are provided between circumferentially adjacent clamping arms, which can improve the elastic deformation effect of the clamping arms. The limiting portion includes an annular shoulder step arranged on the inner side of the sliding cavity. When the plurality of clamping arms move backward to the annular shoulder step, they will be driven to be further pressed against the transmission rod, thereby further clamping the transmission rod and increasing the resistance of the transmission rod when it moves backward.

[0010] Furthermore, a conical or inclined surface is provided on the outer side of the clamping arm, and the conical or inclined surface can further improve the convergence effect when matched with the annular shoulder step.

[0011] Furthermore, a first sealing ring is provided at the sliding fit between the sliding cavity and the transmission rod, and the provision of the first sealing ring can prevent dust and prevent oil leakage inside the pump body.

[0012] Furthermore, an annular flange is provided at the front end of the sliding cavity, and the inner circumferential wall of the annular flange and the front end of the transmission rod are in sliding contact with each other, and the rear end of the transmission rod is provided with an annular boss that is in sliding contact with the inner circumferential wall of the sliding cavity, which can improve the movement effect of the transmission rod. The first sealing ring is arranged on the annular boss, which can better contact and cooperate with the inner wall of the sliding cavity. The annular flange is in abutment with the elastic component, and the elastic component adopts a spring.

[0013] Furthermore, the front part of the screw plug is screwed to the inner side of the mounting hole, and the rear part of the screw plug is provided with an annular step surface which cooperates with the outer edge of the pump body mounting hole to limit the position, and a second sealing ring is provided on the annular step surface. When the screw plug is screwed in the mounting hole, the second sealing ring can be pressed between the screw plug and the pump body to improve the sealing effect.

[0014] Furthermore, the diameter of the transmission rod is smaller than the diameter of the threaded hole, which can prevent the transmission rod from entering the threaded hole, making it convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A side view of an embodiment of the utility model;

[0016] Figure 2 For along Figure 1 A cross-sectional view of the AA section line;

[0017] Figure 3 This is a diagram of the use state of an embodiment of the utility model;

[0018] Figure 4 It is a rear view of the sliding sleeve according to an embodiment of the utility model. DETAILED DESCRIPTION

[0019] The implementation example of the utility model plunger pump swash plate self-locking drive device is as follows Figure 1-4As shown: it includes a screw plug 2 and an adjusting screw 3 which are installed in cooperation with the rear end of the mounting hole 10 of the plunger pump body 1. The center of the screw plug 2 is provided with a threaded hole 20 which is threadedly matched with the adjusting screw 3. The rear end of the adjusting screw 3 is provided with a hexagonal hole which is connected with a twisting tool. The adjusting screw 3 can be driven to move forward and backward by rotating the adjusting screw 3 relative to the screw plug 2. The front end of the screw plug 2 includes a sliding cavity 21 which is connected with the threaded hole 20. A transmission rod 4 is slidably arranged in the sliding cavity 21. The rear end of the transmission rod 4 and the front end of the adjusting screw 3 form a limiting match. When the adjusting screw 3 moves forward and backward, the limiting match between the transmission rod 4 and the adjusting screw 3 can also cause the transmission rod 4 to move forward and backward. Specifically, the adjusting screw 3 directly pushes the transmission rod 4 to move forward; when the adjusting screw 3 moves backward, the transmission rod 4 is driven to move backward by the elastic force (such as a reset spring) of the swash plate reset; a sliding sleeve 5 is provided between the sliding cavity 21 and the transmission rod 4; an elastic member abutting between the screw plug 2 and the sliding sleeve 5 and used to drive the sliding sleeve 5 to reset backward is also provided between the sliding cavity 21 and the transmission rod 4; in this embodiment, the elastic member is a spring 6; a clamping portion for clamping with the transmission rod 4 is provided at the rear end of the sliding sleeve 5; a limiting portion for clamping with the clamping portion of the sliding sleeve 5 and driving the sliding sleeve 5 to clamp on the transmission rod 4 when the sliding sleeve 5 moves backward and is pressed is provided on the inner side of the sliding cavity 21.

[0020] When the transmission rod 4 moves forward, the friction force between the clamping part and the transmission rod 4 can drive the sliding sleeve 5 to move forward, and at the same time compress the elastic component to increase the elastic force of the elastic component. When the elastic force is greater than the friction force between the sliding sleeve 5 and the transmission rod 4, sliding occurs between the sliding sleeve 5 and the transmission rod 4; when the transmission rod 4 moves backward, the clamping part of the sliding sleeve 5 and the limiting part on the inner side of the sliding cavity 21 cooperate to prompt the clamping part to be further clamped on the transmission rod 4, thereby limiting the backward movement of the transmission rod 4 and preventing the adjusting screw 3 from being subjected to excessive thrust, thereby achieving a self-locking effect.

[0021] The clamping portion includes a plurality of clamping arms 51 uniformly distributed circumferentially at the rear end of the sliding sleeve 5, so that the force between the clamping arms 51 and the transmission rod 4 is more uniform. A slot 52 is provided between the circumferentially adjacent clamping arms 51, which can improve the elastic deformation effect of the clamping arms 51. The limiting portion includes an annular shoulder step 22 arranged on the inner side of the sliding cavity 21. The aperture of the sliding cavity 21 at the rear of the annular shoulder step 22 is narrower. When the plurality of clamping arms 51 move backward to the annular shoulder step 22, a convergence effect will be generated, and they will be driven to be further pressed on the transmission rod 4, thereby further clamping the transmission rod and increasing the resistance of the transmission rod 4 when it moves backward.

[0022] A conical surface 510 is disposed on the outer side of the clamp arm 51 . In other embodiments, an inclined surface may also be used. When the conical surface 510 is disposed in conflict with the inner edge of the annular shoulder step 22 , the convergence effect can be further improved.

[0023] A first sealing ring 71 is provided at the sliding fit between the sliding cavity 21 and the transmission rod 4. The first sealing ring 71 can prevent dust and oil leakage inside the pump body.

[0024] The front end of the sliding cavity 21 is provided with an annular flange 23, and the inner circumferential wall of the annular flange 23 and the front end of the transmission rod 4 are in sliding contact with each other. The rear end of the transmission rod 4 is provided with an annular boss 41 that is in sliding contact with the inner circumferential wall of the sliding cavity 21, which can improve the movement effect of the transmission rod 41. The first sealing ring 71 is arranged on the annular boss 41, which can better contact and cooperate with the inner wall of the sliding cavity 21 to improve the sealing performance. The annular flange 23 is in abutment with the elastic component.

[0025] In order to avoid negative pressure at the rear end of the transmission rod 4, a certain gap is left at the threaded connection of the adjusting screw 3 to allow external air to enter or be discharged.

[0026] The front part of the screw plug 2 is screwed to the inner side of the mounting hole 10, and the rear part of the screw plug 2 is provided with an annular step surface 24 which cooperates with the outer edge of the pump body mounting hole 10 to limit the position, and a second sealing ring 72 is provided on the annular step surface 24. When the screw plug 2 is screwed in the mounting hole 10, the second sealing ring 72 can be pressed between the screw plug and the pump body to improve the sealing effect.

[0027] The diameter of the transmission rod 4 is smaller than the diameter of the threaded hole 20 , which can prevent the transmission rod 4 from entering the threaded hole 20 , making it convenient to use.

[0028] The above embodiment is only one of the preferred specific embodiments of the present invention. Common changes and substitutions made by those skilled in the art within the technical solution of the present invention are all included in the protection scope of the present invention.

Claims

1. A self-locking driving device for a plunger pump swash plate, comprising a screw plug and an adjusting screw mounted in cooperation with the rear end of the mounting hole of the plunger pump body, wherein a threaded hole for threaded cooperation with the adjusting screw is provided at the center of the screw plug, characterized in that: The front end of the screw plug includes a sliding cavity connected to the threaded hole, a transmission rod is slidably arranged in the sliding cavity, the rear end of the transmission rod and the front end of the adjusting screw form a limiting fit, a sliding sleeve is provided between the sliding cavity and the transmission rod, and an elastic component abutting between the screw plug and the sliding sleeve and used to drive the sliding sleeve to reset backward is also provided between the sliding cavity and the transmission rod, a clamping portion that cooperates with the transmission rod is provided at the rear end of the sliding sleeve, and a limiting portion that cooperates with the clamping portion of the sliding sleeve and drives the sliding sleeve to clamp on the transmission rod when the sliding sleeve moves backward and pressure is applied is provided on the inner side of the sliding cavity.

2. The plunger pump swash plate self-locking drive device according to claim 1, characterized in that: The clamping part includes a plurality of clamping arms uniformly arranged at the rear end of the sliding sleeve in the circumferential direction, and slots are provided between the circumferentially adjacent clamping arms. The limiting part includes an annular shoulder step arranged at the inner side of the sliding cavity.

3. The plunger pump swash plate self-locking drive device according to claim 2, characterized in that: The outer side of the clamp arm is provided with a conical or inclined surface.

4. The plunger pump swash plate self-locking drive device according to claim 1, characterized in that: A first sealing ring is provided at the sliding fitting position between the sliding cavity and the transmission rod.

5. The plunger pump swash plate self-locking drive device according to claim 4, characterized in that: The front end of the sliding cavity is provided with an annular flange, the inner circumferential wall of the annular flange and the front end of the transmission rod are in sliding contact with each other, and the rear end of the transmission rod is provided with an annular boss that is in sliding contact with the inner circumferential wall of the sliding cavity, and the first sealing ring is arranged on the annular boss, and the annular flange is in abutment with the elastic component.

6. The plunger pump swash plate self-locking drive device according to claim 1, characterized in that: The front part of the screw plug is threadedly arranged inside the mounting hole, and the rear part of the screw plug is provided with an annular step surface which cooperates with the outer edge of the pump body mounting hole for limiting position, and a second sealing ring is arranged at the annular step surface.

7. The plunger pump swash plate self-locking drive device according to claim 1, characterized in that: The diameter of the transmission rod is smaller than the diameter of the threaded hole.

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