Closed-type pump cradle mid-position adjustment device

Abstract

A closed-type pump rocker arm middle position adjusting device, by setting a control valve and the first oil passage, the second oil passage and the third oil passage on the housing, the control valve is installed on the housing and connected to the control piston through a control rod. When the control valve receives a control signal, the oil fluid enters the control valve through drainage and communicates with the first oil passage (or the second oil passage) on one side, and the second oil passage (or the first oil passage) on the other side is connected to the third oil passage, so that the control piston moves to the right (left), and drives the connected rocker arm to swing around the swing center to generate a swing angle α. The displacement of the piston pump is proportional to tanα of the first oil passage. Therefore, the size of the swing angle directly determines the size of the maximum displacement. When the control piston moves a certain distance to the right, it will reach the limit position of the displacement adjusting screw. At this time, it is the maximum swing angle position and also the maximum displacement position. By screwing in or out the displacement adjusting screw, the size of the maximum displacement can be controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of closed pumps, and particularly to a middle position adjusting device for a closed pump rocker. Background Art

[0002] The output displacement of existing hydraulic devices can already be linearly controlled by adjusting external variables (such as hydraulic pressure, current, etc.) through a control valve. However, the external variables restricted by the control are easily interfered, and if the maximum displacement of the hydraulic device is restricted by the control valve, it is likely to fluctuate and cause the main engine to shut down. Summary of the Invention

[0003] In view of this, the present invention provides a middle position adjusting device for a closed pump rocker.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A middle position adjusting device for a closed pump rocker, comprising a housing. An adjusting cavity is formed inside the housing. A piston assembly is arranged in the adjusting cavity. A control valve and a rocker are arranged on the housing. A first oil passage, a second oil passage and a third oil passage are arranged between the control valve and the adjusting cavity. One end of the rocker extends into the adjusting cavity and is connected with the piston assembly. The first oil passage and the second oil passage are respectively communicated with the adjusting cavity at both ends of the piston assembly, and the first oil passage and the second oil passage are not communicated with each other. There is oil in the control valve. The oil enters the adjusting cavity through the first oil passage or the second oil passage, and the oil pushes the piston assembly in the adjusting cavity to reciprocate in the adjusting cavity. The rocker swings under the drive of the adjusting cavity.

[0006] Preferably, the third oil passage is arranged between the first oil passage and the second oil passage. One end of the third oil passage is communicated with the outside of the control valve through the control valve, and the other end is communicated with the adjusting cavity.

[0007] Preferably, the piston assembly includes a core shaft and a piston. One end of the core shaft rotatably extends into the housing and penetrates through the piston. A control rod is arranged between the control valve and the piston. Both ends of the control rod are respectively connected with the control valve and the piston. A piston cavity is formed inside the piston. An elastic adjusting unit is arranged in the piston cavity. By rotating the core shaft, the piston is driven to move in the housing through the elastic adjusting unit, so as to adjust the swing angle of the rocker on the piston.

[0008] Preferably, the piston includes a first piston and a second piston, which are symmetrically arranged at both ends of the mandrel. The first piston and the second piston respectively form corresponding first and second piston chambers, and elastic adjustment units are arranged in the first and second piston chambers. A connection groove is formed between the first piston and the second piston. One end of the control rod extends into the connection groove, and both sides of the end of the control rod extending into the connection groove abut against the first piston and the second piston respectively.

[0009] Preferably, the elastic adjustment unit consists of a spring group, spring seats, limit retaining rings and snap rings. The spring seats are correspondingly arranged on both sides inside the first piston. The spring group is arranged between the spring seats. Corresponding mandrel connection holes are formed on the spring seats, and the mandrel passes through the mandrel connection holes to be connected with the spring seats.

[0010] Preferably, the spring group includes an outer ring spring and an inner ring spring. The outer ring spring is arranged outside the inner ring spring, and both ends of the outer ring spring and the inner ring spring abut against the corresponding spring seats.

[0011] Preferably, an adjustment screw is arranged on the housing. One end of the adjustment screw extends into the adjustment cavity to abut against the piston assembly, and the adjustment screw controls the position of the piston assembly in the adjustment cavity.

[0012] The beneficial effects of the present invention are as follows: By providing a control valve and the first oil passage, the second oil passage and the third oil passage on the housing, the control valve is installed on the housing and connected to the control piston through a control rod. When the control valve receives a control signal, the oil fluid enters the control valve through drainage and communicates with the first oil passage (or the second oil passage) on one side, and the second oil passage (or the first oil passage) on the other side is communicated with the third oil passage, so that the control piston moves to the right (left), and drives the connected rocker to swing around the swing center to generate a swing angle α. The displacement of the plunger pump is proportional to tanα of the first oil passage. Therefore, the size of the swing angle directly determines the size of the maximum displacement. When the control piston moves a certain distance to the right, it will reach the limit position of the displacement adjustment screw. At this time, it is the maximum swing angle position and also the maximum displacement position. By screwing in or out the displacement adjustment screw, the size of the maximum displacement can be controlled. Description of the Drawings

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0014] Att Figure 1 is the structural schematic diagram of the present invention;

[0015] Appendix Figure 2 This is a schematic diagram after the rocking frame of the present invention swings. Embodiment

[0016] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0017] Next, the present invention will be further described in conjunction with the drawings in the specification.

[0018] The present invention provides the following technical solutions:

[0019] As shown in the appendix Figures 1 - 2 As shown, the present invention discloses a closed pump rocker middle position adjusting device, including a housing 1. An adjusting cavity 2 is formed inside the housing 1. A piston assembly 4 is arranged inside the adjusting cavity 2. A control valve 5 and a rocker 6 are arranged on the housing 1. A first oil passage 7, a second oil passage 8 and a third oil passage 9 are arranged between the control valve 5 and the adjusting cavity 2. One end of the rocker 6 extends into the adjusting cavity 2 and is connected to the piston assembly 4. The first oil passage 7 and the second oil passage 8 are respectively communicated with the adjusting cavity 2 at both ends of the piston assembly 4. The first oil passage 7 and the second oil passage 8 are not communicated with each other. There is oil in the control valve 5. The oil enters the adjusting cavity 2 through the first oil passage 7 or the second oil passage 8, and the oil pushes the piston assembly 4 in the adjusting cavity 2 to reciprocate in the adjusting cavity 2. The rocker 6 swings under the drive of the adjusting cavity 2. Specifically, in this design, by setting the control valve 5 and the first oil passage 7, the second oil passage 8 and the third oil passage 9 on the housing 1, the control valve 5 is installed on the housing 1 and is connected to the control piston 3 through the control rod 11. When the control valve 5 receives a control signal, the oil flows through the diversion and enters the control valve 5, communicating with the first oil passage 7 (or the second oil passage 8) on one side. The second oil passage 8 (or the first oil passage 7) on the other side is communicated with the third oil passage 9, so that the control piston 3 moves to the right (left), and drives the connected rocker 6 to swing around the swing center to generate a swing angle α. The displacement of the plunger pump is proportional to the tanα of the first oil passage 7. Therefore, the size of the swing angle directly determines the size of the maximum displacement. When the control piston 3 moves a certain distance to the right, it will reach the limit position of the displacement adjusting screw. At this time, it is the maximum swing angle position and also the maximum displacement position. By screwing in or out the displacement adjusting screw, the size of the maximum displacement can be controlled.

[0020] Furthermore, the third oil passage 9 is arranged between the first oil passage 7 and the second oil passage 8. One end of the third oil passage 9 is communicated with the outside of the control valve 5 through the control valve 5, and the other end is communicated with the adjusting cavity 2.

[0021] Further, the piston assembly 4 includes a mandrel 10 and a piston 3. One end of the mandrel 10 rotatably extends into the interior of the housing 1 and penetrates through the piston 3. A control rod 11 is arranged between the control valve 5 and the piston 3. Both ends of the control rod 11 are respectively connected to the control valve 5 and the piston 3. A piston chamber 12 is formed in the piston 3, and an elastic adjustment unit 13 is arranged in the piston chamber 12. Rotate the mandrel 10, and drive the piston 3 to move in the housing 1 through the elastic adjustment unit 13, so as to adjust the swing angle of the rocker 6 on the piston 3. Specifically, in this embodiment, by setting the mandrel 10 and the housing 1 to be rotatable structures. Further, a threaded connection structure is provided between the mandrel 10 and the inner wall of the housing 1. By screwing the mandrel 10 in or out, the mandrel 10 can drive the piston 3 inside the housing 1 to move inside the housing 1. And during the movement of the piston 3, the elastic adjustment assembly in the adjustment chamber 2 drives the rocker 6, so that the swing angle position of the rocker 6 on the piston 3 changes, thereby controlling the swing angle of the rocker 6 and changing the flow output.

[0022] Further, the piston 3 includes a first piston 16 and a second piston 17. The first piston 16 and the second piston 17 are symmetrically arranged at both ends of the mandrel 10. The first piston 16 and the second piston 17 respectively form corresponding first piston chambers 18 and second piston chambers 19, and corresponding elastic adjustment units 13 are arranged in both the first piston chamber 18 and the second piston chamber 19. A connection groove 20 is formed between the first piston 16 and the second piston 17. One end of the control rod 11 extends into the connection groove 20, and both sides of the end of the control rod 11 extending into the connection groove 20 respectively abut against the first piston 16 and the second piston 17. Specifically, in this embodiment, the symmetrically arranged first piston 16 and second piston 17 are respectively arranged on both sides of the center of the mandrel 10, and the connection groove 20 formed between the first piston 16 and the second piston 17 can be used to connect the control rod 11. The arrangement of the control rod 11 can drive the control rod 11 to swing when the piston 3 moves, so that the control valve 5 can receive the signal generated by the swing of the control rod 11 and feedback it on the control function through the control valve 5.

[0023] Further, the elastic adjustment unit 13 is composed of a spring group 21, a spring seat 22, a limit retaining ring 23 and a snap ring 24. The spring seats 22 are correspondingly arranged on both sides inside the first piston. The spring group 21 is arranged between the spring seats 22. Corresponding mandrel connection holes 14 are opened on the spring seats 22, and the mandrel 10 passes through the mandrel connection holes 14 to be connected to the spring seats 22.

[0024] Further, the spring group 21 includes an outer ring spring 15 and an inner ring spring 27. The outer ring spring is disposed outside the inner ring spring, and both ends of the outer ring spring and the inner ring spring abut against the corresponding spring seat 22. Specifically, in this embodiment, by providing a limit retaining ring 23 and a snap ring 24, the positions of the spring seat 22 and the piston 3 on the mandrel 10 are limited to prevent the piston 3 from moving along the mandrel 10 during the rotation of the mandrel 10, thereby causing the elastic adjustment unit 13 inside the piston 3 to not be compressed and resulting in the inability of the piston 3 to move.

[0025] Further, an adjustment screw 25 is provided on the housing 1. One end of the adjustment screw 25 extends into the adjustment cavity 2 to abut against the piston assembly 4, and the adjustment screw controls the position of the piston assembly 4 in the adjustment cavity 2. Specifically, in this embodiment, by providing the adjustment screw 25 on the housing 1, an adjustment hole 26 for installing the adjustment screw 25 is formed on the housing 1. One end of the adjustment screw 25 extends into the adjustment hole 26. By rotating the other end of the adjustment screw 25, the adjustment screw 25 can be screwed into or out of the adjustment hole 26, so as to adjust the length of the adjustment screw 25 extending into the adjustment cavity 2 according to the required swing angle of the rocker 6. After one end of the adjustment screw 25 extending into the adjustment cavity 2 abuts against one end of the piston 3, the movement of the piston 3 is restricted, thereby changing the swing angle of the rocker 6.

[0026] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A closed-type pump cradle middle position adjusting device, including a housing, an adjusting cavity is formed inside the housing, and it is characterized in that: A piston assembly is arranged in the adjustment cavity. A control valve and a rocker are arranged on the housing. A first oil passage, a second oil passage and a third oil passage are arranged between the control valve and the adjustment cavity. One end of the rocker extends into the adjustment cavity and is connected with the piston assembly. The first oil passage and the second oil passage are respectively communicated with the adjustment cavities at both ends of the piston assembly. The first oil passage and the second oil passage are not communicated with each other. There is oil in the control valve. The oil enters the adjustment cavity through the first oil passage or the second oil passage. And the oil pushes the piston assembly in the adjustment cavity to reciprocate in the adjustment cavity. The rocker swings under the drive of the adjustment cavity. The third oil passage is arranged between the first oil passage and the second oil passage. One end of the third oil passage is communicated with the outside of the control valve through the control valve, and the other end is communicated with the adjustment cavity. The piston assembly includes a core shaft and a piston. One end of the core shaft rotatably extends into the housing and penetrates through the piston. A control rod is arranged between the control valve and the piston. Both ends of the control rod are respectively connected with the control valve and the piston. A piston cavity is formed in the piston. An elastic adjustment unit is arranged in the piston cavity. Rotate the core shaft, and drive the piston to move in the housing through the elastic adjustment unit, so as to adjust the swing angle of the rocker on the piston. The piston includes a first piston and a second piston. The first piston and the second piston are symmetrically arranged at both ends of the core shaft. The first piston and the second piston respectively form corresponding first piston cavities and second piston cavities. And corresponding elastic adjustment units are arranged in both the first piston cavity and the second piston cavity. A connection groove is formed between the first piston and the second piston. One end of the control rod extends into the connection groove. And both sides of the end of the control rod extending into the connection groove respectively abut against the first piston and the second piston.

2. The closed-type pump cradle mid-position adjusting device according to claim 1, wherein: The elastic adjustment unit consists of a spring group, a spring seat, a limit retaining ring and a snap ring. The spring seats are correspondingly arranged on both sides inside the first piston. The spring group is arranged between the spring seats. Corresponding core shaft connection holes are formed in the spring seats. The core shaft penetrates through the core shaft connection holes and is connected with the spring seats.

3. The closed-type pump cradle mid-position adjusting device according to claim 2, characterized in that: The spring group includes an outer ring spring and an inner ring spring. The outer ring spring is arranged outside the inner ring spring. Both ends of the outer ring spring and the inner ring spring abut against the corresponding spring seats.

4. The closed-type pump cradle mid-position adjusting device according to claim 1, characterized in that: An adjustment screw is arranged on the housing. One end of the adjustment screw extends into the adjustment cavity and abuts against the piston assembly. The adjustment screw controls the position of the piston assembly in the adjustment cavity.

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