CN114810533A

CN114810533A - Control valve group, tool, hydraulic pump, control valve group assembling method and engineering machinery

Info

Publication number: CN114810533A
Application number: CN202210333626.9A
Authority: CN
Inventors: 梁允昇; 翟学军; 杨时运
Original assignee: HANGZHOU LILONG HYDRAULIC CO LTD
Current assignee: HANGZHOU LILONG HYDRAULIC CO LTD
Priority date: 2022-03-30
Filing date: 2022-03-30
Publication date: 2022-07-29

Abstract

The application provides a control valve group, a tool, a hydraulic pump, a control valve group assembling method and engineering machinery. The control valve group includes: the valve body is provided with a through hole and a containing cavity, the through hole is communicated with the containing cavity, and the through hole penetrates from the outer side wall of the valve body to the inner side wall of the valve body along a first direction; when the control valve group is assembled, the tool is suitable for penetrating through the through hole and extending into the containing cavity. This valve unit is through setting up the through-hole in the valve body, stretches into the frock that holds the chamber and holds the part butt of intracavity cooperation assembly, just can solve the installation difficulty of valve unit that causes because the vision blind area to can improve the installation effectiveness.

Description

Control valve group, tool, hydraulic pump, control valve group assembling method and engineering machinery

Technical Field

The invention relates to the technical field of valve assembly, in particular to a control valve group, a tool, a hydraulic pump, a control valve group assembly method and engineering machinery.

Background

In the related prior art, axial plunger pumps of high-pressure open systems such as arm support pumps, vehicle-mounted pumps, trailer pumps and the like have the characteristics of various control modes, high integration degree, light weight, low noise, quick response and the like, and a control valve group with proportional integrated electromagnet control stroke limiter, constant power and pressure cut-off functions is mostly adopted.

In the existing pump, a control valve group is connected and matched with a return piston in an end cover through a feedback valve core and a feedback valve sleeve, and constant power control is realized through a position on-off oil way of the feedback valve group.

However, the feedback valve core and the feedback valve sleeve are connected with the control valve body through mechanisms such as a top wheel, a crank rod, an electrical variable spring and the like, so that the positions of the feedback valve core and the feedback valve sleeve relative to the positioning pin are uncertain. Due to the visual blind area caused by the shielding of the valve body during installation, the control valve group is difficult to assemble.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defect that the control valve group in the prior art is difficult to install due to the blind area caused by shielding during installation, thereby providing the control valve group and the hydraulic pump which are convenient to install.

In order to solve the above problems, the present invention provides a control valve group, comprising: the valve body is provided with a through hole and a cavity, the through hole is communicated with the cavity, and the through hole penetrates from the outer side wall of the valve body to the inner side wall of the valve body along a first direction;

when the control valve group is assembled, a tool is suitable to penetrate through the through hole and extend into the containing cavity.

According to the control valve group provided by the invention, through holes communicated with the containing cavity are formed in the valve body, when parts which are matched and assembled are partially positioned in the containing cavity, the tool extending into the containing cavity is abutted against the parts in the containing cavity, so that the problem of difficulty in mounting the control valve group caused by a vision blind area can be solved, and the mounting efficiency can be improved.

Optionally, the control valve group further comprises: and the sealing mounting structure is annularly arranged on the inner wall of the through hole and is suitable for connecting a sealing element.

Optionally, the seal mounting structure comprises: the threaded section is suitable for being in threaded connection with the sealing element, and the sealing element is a plug.

The invention provides a tool, which comprises: and the rod body is suitable for penetrating through the through hole of the control valve group and extending into the accommodating cavity of the control valve group.

Optionally, the tool further includes: the rod cap is arranged on the end face of one end of the rod body and is provided with a first annular end face and a second annular end face, and the diameter of the first annular end face is larger than that of the second annular end face; the end, far away from the cavity, of the through hole is provided with a counter bore, the diameter of the first annular end face is larger than that of the counter bore, the diameter of the second annular end face is smaller than that of the counter bore, and the counter bore is suitable for containing part of the rod cap.

Optionally, the second annular end face is adapted to abut a bottom wall of the counterbore; and/or the tool is suitable for clearance fit with the through hole; and/or the end face of the tool at one end of the accommodating cavity is an arc convex surface.

The present invention also provides a hydraulic pump, comprising: an end cap having a fitting cavity; the oil return piston assembly is partially positioned in the assembly cavity and is connected with the end cover; in the control valve group, the accommodating cavity of the control valve group is opposite to and communicated with the assembling cavity; a feedback valve assembly connected to the return piston assembly and extending partially into the cavity; the tool is abutted to the feedback valve assembly so as to install the control valve group on the end cover.

Optionally, the return piston assembly has a return piston bore, the feedback valve assembly including a feedback valve sleeve extending partially into the return piston bore; the length of the tool enables the tool to be abutted to the outer side wall of the feedback valve sleeve, and the axis of the feedback valve sleeve can coincide with the axis of the return piston hole.

The invention also provides an assembly method of the control valve group of the hydraulic pump, which comprises the following steps: the tool is inserted into the cavity from the through hole of the control valve group and then props against the feedback valve sleeve; the tool pushes the feedback valve assembly to move along the runway direction and compress the electric variable spring; after the tool contacts and is limited with the outer side wall of the control valve group, the axis of the feedback valve assembly coincides with the axis of the return piston hole, so that the tool can install the control valve group on the end cover of the hydraulic pump.

The invention also provides engineering machinery comprising the hydraulic pump.

The invention has the following advantages:

1. by utilizing the technical scheme of the invention, the through hole is formed in the valve body, and the tool which penetrates through the through hole and extends into the containing cavity is abutted against the component in the containing cavity, so that the problem of difficult installation of the control valve group caused by a visual blind area can be solved, and the installation efficiency can be improved.

2. The through hole is in clearance fit with the tool, so that clamping stagnation during tool operation can be avoided.

3. Sealing can be realized by arranging a sealing installation structure in the through hole;

4. the end face of the tool at one end of the accommodating cavity is provided with the arc convex surface, so that the reliability of the force of the tool acting on the feedback valve sleeve can be improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic sectional view of a control valve assembly according to the present invention;

FIG. 2 is an enlarged schematic view of the mechanism at A in FIG. 1;

FIG. 3 is a schematic cross-sectional view of a tool for controlling a valve group according to the present invention;

FIG. 4 is a partial enlarged sectional view schematically illustrating a hydraulic pump according to the present invention;

FIG. 5 is a partial sectional structural view of a hydraulic pump according to the present invention;

fig. 6 is a flowchart of an assembly method of a control valve block of a hydraulic pump according to the present invention.

Description of reference numerals:

10. a hydraulic pump; 100. a control valve group; 110. a valve body; 111. a through hole; 1111. a counter bore; 113. an outer sidewall; 115. a cavity; 117. an inner sidewall; 120. assembling; 121. a rod body; 1211. an arc convex surface; 123. a rod cap; 1321. a first annular end face; 1233. a second annular end face; 130. a seal mounting structure; 140. a constant power valve core; 200. a feedback valve assembly; 210. a feedback valve housing; 220. a feedback spool; 300. an oil return piston assembly; 310. a return piston bore; 400. a crank lever; 500. a top wheel; 600. an electrically variable spring; 700. a housing; 800. end caps, 810, an assembly cavity; 900. a swash plate.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Exemplary control valve group

Fig. 1 is a schematic top view of a control valve assembly 100, which includes: the valve body 110, the valve body 110 has a through hole 111 and a cavity 115, the through hole 111 communicates with the cavity 115, and the through hole 111 penetrates from the valve outer side wall 113 of the valve body 110 to the inner side wall 117 of the valve body 110 along the first direction X.

When the control valve group 100 is assembled, the tool 120 is adapted to pass through the through hole 111 and extend into the cavity 115.

The valve body 110 has an outer side wall 113, a cavity 115 and a through hole 111, wherein the cavity wall of the cavity 115 includes an inner side wall 117, the inner side wall 117 is opposite to the outer side wall 113, one end of the through hole 111 extends to the outer side wall 113, and the other end of the through hole 111 extends to the inner side wall 117 and is communicated with the cavity 115. The fixture 120 penetrates through the through hole 111 and has one end extending into the cavity 115.

The control valve assembly 100 further includes a constant power valve core 140, the constant power valve core 140 is partially installed in the valve body 110, the constant power valve core 140 partially extends into the cavity 115, and an axial direction of the constant power valve core 140 is parallel to an axial direction of the through hole 111. The housing 115 is provided with components that cooperate with the control valve assembly 100 for assembly. The surface of the outer sidewall 113 of the valve body 110 is a plane, and the surface of the inner sidewall 117 of the cavity 115 is the same plane. The through hole 111 is used to penetrate through the outer sidewall 113 of the valve body 110 and the cavity 115, so that the tool 120 can penetrate through the through hole 111 and extend into the cavity 115. The through holes 111 are far away from oil passages and bolt holes in the valve body 110, and the original performance of the valve body 110 cannot be influenced. Because the cavity 115 is arranged inside the valve body 110, when the parts which are assembled in a matching way are partially positioned in the cavity 115, the tool 120 extending into the cavity 115 is abutted against the parts positioned in the cavity 115, so that the problem of difficulty in mounting the control valve group 100 due to a vision blind area can be solved, and the mounting efficiency can be improved.

This control valve body 110 subassembly is through boring the suitable through-hole 111 of size, can not influence the intensity of valve body 110 excessively, can not increase manufacturing cost, and through-hole 111 cooperation frock 120 is in order to realize the installation to the part butt in the appearance chamber 115, simple structure, and the installation effectiveness is high.

Specifically, the control valve group 100 further includes: and the sealing installation structure 130, wherein the sealing installation structure 130 is annularly arranged on the inner wall of the through hole 111, and the sealing installation structure 130 is suitable for being connected with a sealing element. When the control valve group 100 is installed through the tool 120, in order to prevent oil from flowing out of the valve body 110 through the through hole 111, the sealing installation structure 130 is connected to the sealing element, so that the accommodating cavity 115 of the valve body 110 and the outside of the valve body 110 form a seal, and the oil cannot leak to the outside of the valve body 110 through the through hole 111.

Specifically, the seal mounting structure 130 includes: the screw thread section, screw thread section and sealing member threaded connection, the sealing member includes the plug, simple structure can prevent the oil leak. Specifically, after the threaded section is connected with the plug, the cavity 115 of the valve body 110 forms a seal with the outside of the valve body 110, and oil cannot leak out of the valve body 110 through the through hole 111.

Exemplary tooling

This frock 120 includes: rod 121 is adapted to extend through hole 111 of valve block 100 and into cavity 115 of valve block 100.

Specifically, the tooling 120 is clearance fit with the through hole 111. Wherein, frock 120 can be including being cylindric body of rod 121, more facilitates the use, and frock 120 and through-hole 111 are clearance fit, can prevent that frock 120 from producing the jamming in through-hole 111.

More specifically, the tool 120 further includes: the rod cap 123, the rod body 121 is suitable for penetrating through the through hole 111, the rod cap 123 is arranged on the end face of one end of the rod body 121, and the rod cap 123 is suitable for abutting against the outer side wall 113. The rod body 121 is cylindrical, and the rod cap 123 may also be cylindrical. The diameter of the rod body 121 is smaller than the diameter of the rod cap 123, so that the rod cap 123 can abut against the outer side wall 113 to limit the length of the rod body 121 extending into the cavity 115.

Specifically, the stem cap 123 has a first annular end surface 1231 and a second annular end surface 1233, the diameter of the first annular end surface 1231 being greater than the diameter of the second annular end surface 1233. The through hole 111 is provided with a counter bore 1111 at one end far away from the cavity 115, the diameter of the first annular end surface 1231 is larger than that of the counter bore 1111, and the diameter of the second annular end surface 1233 is smaller than that of the counter bore 1111. The counterbore 1111 is adapted to receive a portion of the stem cap 123. It will be appreciated that the stem cap 123 is formed of two cylindrical segments of different diameters and coaxially disposed such that a first annular end surface 1231 is formed between the two cylindrical segments, the first annular end surface 1231 being abuttable to the outer sidewall 113. A second annular end surface 1233 is formed between the relatively smaller diameter cylindrical section and the rod body 121. When the rod cap 123 is rotated, because part of the structure of the rod cap 123 is located in the counter bore 1111, the tool 120 is rotated more stably, and the reliability of the tool 120 can be improved.

More specifically, the second annular end surface 1233 is adapted to abut the bottom wall of the counterbore 1111. Counter bore 1111 cooperates with the cylinder section of minor diameter, can further carry on spacingly to the extension length of frock 120 in holding chamber 115.

Exemplary Hydraulic Pump

This hydraulic pump includes: the end cap has a mounting cavity 810, the return piston assembly 300 is partially located in the mounting cavity 810, and the return piston assembly 300 is connected to the end cap, the control valve assembly 300, and the feedback valve assembly 200. The control valve block receptacle 115 is opposite and in communication with the assembly chamber 810, the feedback valve assembly 200 is connected to the return piston assembly 300, and the feedback valve assembly 200 extends partially into the receptacle 115. Wherein the tool 120 is used to abut against the feedback valve assembly 200 to mount the control valve block on the end cap.

The hydraulic pump can be an axial plunger pump of a high-pressure open system such as an arm support pump, a vehicle-mounted pump, a trailer pump and the like.

Specifically, the mounting cavity 810 of the end cap is disposed on the sidewall of the end cap, the receptacle 115 is disposed within the valve body 110 of the control valve block, and when the control valve body 110 assembly is mounted to the end cap, the receptacle 115 opposes the mounting cavity 810 and may form a sealed cavity. The axial direction of the through hole 111 of the valve body 110 of the control valve group is along the play direction of the feedback valve sleeve 210.

The oil return piston assembly 300 has a return piston hole, the axis of the return piston hole is perpendicular to the axis of the through hole 111, the feedback valve assembly 200 includes a feedback valve sleeve 210, the feedback valve sleeve 210 partially extends into the return piston hole, and the feedback valve assembly further includes a feedback valve core 220, and the feedback valve sleeve 210 is sleeved outside the feedback valve core 220. In order to prevent the high-pressure oil from leaking, the matching accuracy of the feedback valve sleeve 210 and the return piston hole is required to be high, and therefore, after the tool 120 abuts against the outer side wall 113 of the feedback valve sleeve 210, the axis of the feedback valve sleeve 210 and the axis of the return piston hole can be overlapped. It can be understood that, considering the manufacturing error, it is difficult to actually ensure that the axis of the feedback valve sleeve 210 and the axis of the return piston hole are exactly coincident when the end of the tool 120 contacts the surface of the valve body 110, and therefore, the length of the rod body 121 of the tool 120 should be extended by 1 mm to 2 mm, so as to reserve an adjustment space for the actual assembly work.

When the control valve group is installed in the hydraulic pump, the displacement limiting screw needs to be jacked, the swash plate 900 of the hydraulic pump is located at the position with the largest inclination angle, the position of the return piston assembly in the end cover is determined, and in order to guarantee smooth installation, the position of the feedback valve assembly 200 arranged in the valve body 110 of the control valve group corresponding to the positioning pin also needs to be determined. Therefore, by controlling the length of the rod 121 of the tool 120, when the end of the rod 121 contacts the side surface of the feedback valve sleeve 210, the axis of the feedback valve sleeve 210 coincides with the axis of the return piston hole, and the control valve assembly can be smoothly installed on the end cover.

The end surface of the fixture 120 at one end of the cavity 115 is an arc convex surface 1211, so that the force direction between the fixture 120 and the feedback valve sleeve 210 is correct, and the deviation of the feedback valve assembly 200 can be prevented.

The hydraulic pump further comprises a crank lever 400, a top wheel 500, an electrical variable spring 600, an electrical variable valve core, an electromagnet, a return tool, a swash plate 900 and a shell 700, wherein the crank lever 400, the top wheel 500, the electrical variable spring 600 and the feedback valve sleeve 210 can be regarded as components for being installed in cooperation with a control valve bank. The return tool and the swash plate 900 are located in a cavity of the shell 700, the swash plate 900 is connected with one end of the return tool, the other end of the return tool can be abutted against the return piston assembly, the return piston assembly is partially located in the cavity of the shell 700, and the end cover is connected with the shell 700. The crank lever 400 is in contact with the constant power spool 140, the top wheel 500 is in contact with the crank lever 400, and the top wheel 500 is in contact with the feedback spool 220. The electrical variable valve spool is disposed between the valve body 110 and the housing 700, and the electrical variable spring 600, the electrical variable valve spool, and the electromagnet may be coaxially disposed.

Method of assembling control valve block for an exemplary hydraulic pump

As shown in fig. 6, the method for assembling the control valve group of the hydraulic pump includes the following steps:

s101: the tool 120 is inserted into the cavity 115 from the through hole 111 of the control valve group 100 and then props against the feedback valve sleeve 210;

s103: the tool 120 pushes the feedback valve assembly 200 to move along the runway direction Y and compress the electrical variable spring 600;

s105: after the tool 120 contacts and limits the outer side wall 113 of the control valve group 100, the axis of the feedback valve assembly 200 coincides with the axis of the return piston hole 310, so that the tool 120 can mount the control valve group 100 on the end cover of the hydraulic pump 10.

In the method for assembling the control valve assembly of the hydraulic pump, when the control valve assembly is installed on the hydraulic pump, the tool 120 is inserted into the receiving cavity 115 from the through hole 111 of the valve body 110 of the control valve assembly and then abuts against the feedback valve sleeve 210, so that the whole feedback valve assembly moves along the track direction Y of the top wheel 500-the crank rod 400 and compresses the electrical variable spring 600 until the rod cap 123 is in contact with the outer side wall 113 for limiting, and when the axis of the feedback valve assembly 200 is overlapped with the axis of the return piston hole 310, the control valve assembly 100 can be smoothly installed on the end cover. After the control valve group 100 is installed, the tool 120 is withdrawn, the threaded section in the through hole 111 is provided with the plug, and the plug arranged in the through hole 111 can prevent the oil leakage of the hydraulic pump 10 during operation.

Exemplary working machine

The working machine comprises the above-mentioned hydraulic pump 10. The engineering machine includes the control valve group 100 in any one of the above implementation manners, so that the engineering machine has the technical effect of any one of the above control valve group 100, and details are not repeated herein.

According to the above description, the present application has the following advantages:

1. only need one with through-hole 111 matched with frock 120 in the valve body 110 can carry out accurate location to the case of valve unit, can avoid when operating the part in the appearance chamber 115 of the inside of locating valve body 110, cause the installation difficulty because the sight blind area for simple structure need not the workstation, easily operation, and is with low costs.

2. Before the control valve set is installed, the feedback valve sleeve 210 is propped against the tool 120, so that the feedback valve sleeve 210 can be prevented from moving left and right along the track of the crank lever 400 along with the extension and contraction of the variable spring;

3. when the control valve group is installed, the problem that the relative position of the feedback valve sleeve 210 and the positioning pin is uncertain can be solved by setting the length of the tool 120.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims

1. A control valve block (100), comprising:

the valve body (110) is provided with a through hole (111) and a containing cavity (115), the through hole (111) is communicated with the containing cavity (115), and the through hole (111) penetrates from the outer valve side wall (113) of the valve body (110) to the inner side wall (117) of the valve body (110) along a first direction (X);

when the control valve group (100) is assembled, a tool (120) is suitable to penetrate through the through hole (111) and extend into the accommodating cavity (115).

2. Valve group (100) according to claim 1, characterized in that said valve group (100) further comprises:

and the sealing installation structure (130) is annularly arranged on the inner wall of the through hole (111), and the sealing installation structure (130) is suitable for being connected with a sealing element.

3. Valve block (100) according to claim 2, wherein the sealing mounting structure (130) comprises:

the threaded section is suitable for being in threaded connection with the sealing element, and the sealing element is a plug.

4. A tool (120), comprising:

stem (121) suitable for penetrating through a through hole (111) of a valve group (100) according to any one of claims 1 to 3 and projecting into a housing volume (115) of said valve group (100).

5. The tool (120) according to claim 4, wherein the tool (120) further comprises:

the rod cap (123) is arranged on the end face of one end of the rod body (121), the rod cap (123) is provided with a first annular end face (1231) and a second annular end face (1233), and the diameter of the first annular end face (1231) is larger than that of the second annular end face (1233);

wherein the end of the through hole (111) remote from the cavity (115) has a counterbore (1111), the first annular end surface (1231) has a diameter greater than the diameter of the counterbore (1111), the second annular end surface (1233) has a diameter less than the diameter of the counterbore (1111), the counterbore (1111) being adapted to receive part of the rod cap (123).

6. The tooling (120) of claim 5, wherein the second annular end face (1233) is adapted to abut a bottom wall of the counterbore (1111); and/or the tool (120) is suitable for clearance fit with the through hole (111); and/or the end surface of the tool (120) at one end of the cavity (115) is an arc convex surface (1211).

7. A hydraulic pump (10), comprising:

an end cap (800) having a mounting cavity (810);

a return piston assembly (300) partially located in the assembly chamber (810), the return piston assembly (300) being connected to the end cap (800);

control valve group (100) according to any of the claims from 1 to 3, the volume (115) of the control valve group (100) being opposite and communicating with the assembly chamber (810);

a feedback valve assembly (200) connected to the return piston assembly (300) with the feedback valve assembly (200) partially extending into the cavity (115);

wherein the valve block (100) is mounted on the end cap (800) using the tooling (120) of any one of claims 4 to 6 in abutment with the feedback valve assembly (200).

8. The hydraulic pump (10) of claim 7, wherein the return piston assembly (300) has a return piston bore (310), the feedback valve assembly (200) including a feedback valve sleeve (210), the feedback valve sleeve (210) extending partially into the return piston bore (310);

the length of the tool (120) enables the axis of the feedback valve sleeve (210) to be coincident with the axis of the return piston hole (310) after the tool (120) is abutted to the outer side wall of the feedback valve sleeve (210).

9. A method of assembling a control valve block for a hydraulic pump, comprising:

the tool (120) is inserted into the cavity (115) from the through hole (111) of the control valve group (100) and then props against the feedback valve sleeve (210);

the tool (120) pushes the feedback valve assembly (200) to move along the runway direction (Y) and compress the electric variable spring (600);

after the tooling (120) contacts and limits the outer side wall (113) of the control valve group (100), the axis of the feedback valve assembly (200) coincides with the axis of the return piston hole (310), so that the tooling (120) can install the control valve group (100) on an end cover of the hydraulic pump (10).

10. A working machine, characterized in that it comprises a hydraulic pump (10) according to claim 7 or 8.