Quick dismounting tool for quick-wear part of cam with spring force closed structure

Abstract

The utility model relates to the field of metering pump dismounting, in particular to a quick dismounting tool for a quick-wear part of a cam with a spring force closed structure, which comprises a transmission box body, and a cam body, a cam driven part matched with the cam body, a reset spring and a guide sleeve are arranged in the transmission box body. The mounting structure is directly arranged on the transmission box body, when the first ejector rod or the second ejector rod moves in the axial direction, the first ejector rod or the second ejector rod can abut against the rear end of the cam driven piece or is inserted into the driven piece positioning hole, the driven piece is pushed to compress the reset spring or fix the position of the cam driven piece, and therefore the cam body is separated from the cam driven piece; in the whole process, a pump head, inlet and outlet pipelines and fluid end components do not need to be disassembled, lubricating oil or hydraulic oil in the transmission box body does not need to be emptied, the oil pollution risk and the tedious step of re-oiling in a traditional method are fundamentally avoided, and the maintenance time and cost are greatly reduced.

Description

Technical Field

[0001] The utility model belongs to the field of metering pump disassembly, and in particular relates to a quick disassembly tool for a cam wearing part with a spring force closed structure. Background Art

[0002] In the cam transmission mechanism of a metering pump, the cam is a key and vulnerable part for transmitting power and needs to be replaced regularly to ensure the normal operation of the equipment. Traditional cam transmission mechanisms mostly use a spring force closed structure, and the follower maintains contact with the cam through spring force.

[0003] However, in the prior art, when disassembling the cam, it is necessary to first drain the hydraulic oil and lubricating oil in the transmission case, and at the same time remove the pump head, pipelines and other peripheral components before the follower can be separated from the cam, resulting in a cumbersome, time-consuming and labor-intensive disassembly process. This not only increases maintenance costs, but may also pose safety hazards due to problems such as incomplete pressure relief of the hydraulic system. Therefore, there is an urgent need for an efficient, safe cam disassembly technology solution that does not require disassembly of peripheral components to address the shortcomings of the existing disassembly method. Utility Model Content

[0004] In order to overcome the problems in the prior art that when disassembling the cam, it is necessary to drain the hydraulic oil and lubricating oil in the transmission box, remove the pump head and pipelines and other surrounding components, which leads to cumbersome operation, time-consuming and labor-intensive, high maintenance costs and safety hazards, a spring-force closed structure cam wearing parts quick disassembly tool is proposed.

[0005] The technical solution of the utility model is: a quick disassembly tool for cam wearing parts of a spring force closed structure, comprising a transmission case, a cam body, a cam follower cooperating with the cam body, a return spring and a guide sleeve provided in the transmission case, the cam follower being inserted into the guide sleeve and being movable axially along the guide sleeve, and also comprising a mounting structure fixed to the transmission case, the mounting structure being provided with a fixing component connected to the transmission case; the mounting structure being provided with a pushing component cooperating with the mounting structure, the pushing component being movable axially and abutting against the rear end of the cam follower or being inserted into a follower positioning hole thereon, for pushing the cam follower to compress the return spring, so that the cam follower is separated from the cam body, or fixing the position of the cam follower; the transmission case being provided with a through hole for disassembling the cam body.

[0006] Furthermore, the mounting structure is a threaded bushing, and the fixing component includes a hexagon socket screw and a hexagonal nut; the threaded bushing is fixed to the rear side of the transmission case by the hexagon socket screw and the hexagonal nut, and an O-ring seal is provided between the threaded bushing and the transmission case; the pushing component is a first push rod, the first push rod is threadedly connected to the threaded bushing, a sealing gasket is provided on the first push rod, and a radial sealing ring is provided in the threaded bushing for achieving double sealing of the first push rod and the threaded bushing.

[0007] Furthermore, the guide sleeve is fixed in the transmission housing, the guide sleeve is sleeved on the outer side of the cam follower, and the return spring is located between the guide sleeve and the cam follower.

[0008] Furthermore, a first threaded hole is provided on the top of the transmission housing, a hexagonal bolt is threadedly connected to the inner wall of the first threaded hole, and a push rod positioning hole is provided at the rear end of the cam follower; when the first push rod pushes the cam follower to separate from the cam body, the hexagonal bolt is passed through the first threaded hole and inserted into the push rod positioning hole to fix the cam follower to the transmission housing.

[0009] Furthermore, a threaded groove is formed on one end of the first push rod away from the transmission housing, and a hexagonal bolt is threadedly mounted on the inner wall of the threaded groove.

[0010] Furthermore, the mounting structure is a flange, and the fixing component is two hexagon socket screws; the flange is fixed to the top of the transmission case by the two hexagon socket screws, and a second threaded hole is provided in the center of the flange; the pushing component is a second push rod, which passes through the second threaded hole in the center of the flange and is threadedly connected to the flange, and the top side wall of the second push rod is provided with two hexagonal nuts for fixing the axial position of the second push rod; the end of the cam follower close to the center of the transmission case is provided with an end cover, and the end cover is in contact with the cam body.

[0011] Furthermore, a follower positioning hole is opened on the side wall of the cam follower close to the end cover, the axis of the second push rod is aligned with the axis of the follower positioning hole, the cam body is installed in the transmission case through the camshaft, and the bottom end of the second push rod is inserted into the follower positioning hole of the cam follower to fix the axial position of the cam follower, so that the cam body can be moved away from the end cover by rotating the camshaft.

[0012] Furthermore, the guide sleeve is fixedly connected to the transmission housing, and the return spring is sleeved outside the cam follower and located inside the guide sleeve.

[0013] Beneficial effects of the utility model:

[0014] 1. By directly setting up the mounting structure on the transmission housing, when the first push rod or the second push rod moves axially, it can abut the rear end of the cam follower or insert into the follower positioning hole, push the follower to compress the return spring or fix the position of the cam follower, and separate the cam body from the cam follower. The entire process does not require disassembly of the pump head, inlet and outlet pipelines and hydraulic end components, nor does it require emptying the lubricating oil or hydraulic oil in the transmission housing. This fundamentally avoids the risk of oil contamination and the tedious steps of re-oiling in traditional methods, significantly reducing maintenance time and costs.

[0015] 2. The first push rod is threadedly connected to the threaded bushing. By rotating the first push rod, the follower is pushed backward and the reset spring is compressed. After the follower is separated from the cam body, the first threaded hole on the top of the box body and the hexagonal bolt are inserted into the push rod positioning hole of the cam follower to quickly fix the cam follower. The second push rod passes through the second threaded hole of the flange plate. By rotating the second push rod, the bottom end of the second push rod is inserted into the follower positioning hole to directly fix the position of the cam follower. The cam body is then moved away from the cam follower by rotating the camshaft. Both solutions achieve rapid positioning and separation of the cam follower through the coordination of the tooling with the existing structure of the box body. Compared with the traditional method, the disassembly steps of components such as the plunger and slide assembly are reduced, significantly improving disassembly efficiency.

[0016] 3. Since there is no need to frequently disassemble the pump head and pipelines, problems such as seal failure and part damage caused by improper reassembly of components are avoided, and the risk of hydraulic system leakage or installation deviation of transmission components is reduced. At the same time, the matching structure of the guide sleeve and the cam follower ensures that the cam follower maintains axial stability during the pushing process, and the compression and reset process of the return spring are controllable, avoiding safety accidents caused by uncontrolled spring force in traditional methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Shown is a schematic diagram of the first embodiment of the present utility model;

[0018] Figure 2 Shown is a schematic diagram of a second embodiment of the present utility model;

[0019] Figure 3 Shown is a schematic diagram of the positioning hole of the follower of the present utility model;

[0020] Figure 4 Shown is a schematic diagram of the second threaded hole of the present invention.

[0021] The marks in the accompanying drawings are: 1. Hexagon head bolt; 2. First push rod; 3. Sealing gasket; 4. Threaded bushing; 5. Transmission housing; 6. Cam body; 7. Hexagon bolt; 8. Return spring; 9. Guide sleeve; 10. Cam follower; 11. Radial sealing ring; 12. O-ring; 13. Hexagon nut one; 14. Hexagon socket screw one; 15. Hexagon head nut two; 16. Second push rod; 17. Hexagon socket screw two; 18. Flange; 19. Camshaft; 20. End cover; 21. First threaded hole; 22. Through hole; 23. Push rod positioning hole; 24. Second threaded hole; 25. Follower positioning hole. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] See also Figures 1-4 , a spring force closed structure cam wearing parts quick disassembly tool, including a transmission box body 5, a cam body 6, a cam follower 10 cooperating with the cam body 6, a return spring 8 and a guide sleeve 9 are provided in the transmission box body 5, the cam follower 10 is arranged in the guide sleeve 9 and can move axially along the guide sleeve 9, and also includes a mounting structure fixed to the transmission box body 5, a fixing component connected to the transmission box body 5 is provided on the mounting structure; a pushing component cooperating with the mounting structure is provided on the mounting structure, the pushing component can move axially and abut the rear end of the cam follower 10 or be inserted into the follower positioning hole 25 thereon, used to push the cam follower 10 to compress the return spring 8, so that the cam follower 10 is separated from the cam body 6, or the position of the cam follower 10 is fixed; the transmission box body 5 is provided with a through hole 22 for disassembling the cam body 6.

[0024] The tooling includes a transmission housing 5, inside which are provided a cam body 6, a cam follower 10, a return spring 8 and a guide sleeve 9. The cam follower 10 is arranged in the guide sleeve 9 and can move along its axial direction. The guide sleeve 9 provides an axial movement guide for the cam follower 10 to ensure its stable movement. The return spring 8 and the cam follower 10 cooperate to form a closed structure to ensure that the two are in stable contact with the cam body 6. It also includes a mounting structure fixed to the transmission housing 5. The mounting structure is connected to the transmission housing 5 through a fixing component to provide a stable mounting foundation for the push component, which can move along the axial direction. The cam follower 10 is separated from the cam body 6 by abutting against the rear end of the cam follower 10 and pushing the compressed return spring 8, or the cam follower 10 is fixed in position by inserting the follower positioning hole 25. The operation is flexible and the follower and the cam body 6 can be quickly separated or positioned without disassembling other core components such as the pump head and pipelines, which greatly simplifies the maintenance process. The through hole 22 on the transmission case 5 provides a direct channel for disassembly of the cam body 6. Combined with the positioning or separation function of the pushing component, the cam body 6 can be directly disassembled from the through hole 22, further improving the disassembly efficiency and reducing the maintenance workload.

[0025] Example 1: Please refer to Figure 1 , the present application provides a technical solution: the mounting structure is a threaded bushing 4, and the fixing components include a hexagon socket screw 14 and a hexagon nut 13; the threaded bushing 4 is fixed to the rear side of the transmission case 5 by the hexagon socket screw 14 and the hexagon nut 13, and an O-ring 12 is provided between the threaded bushing 4 and the transmission case 5 for sealing; the pushing component is a first push rod 2, the first push rod 2 is threadedly connected to the threaded bushing 4, a sealing gasket 3 is provided on the first push rod 2, and a radial sealing ring 11 is provided in the threaded bushing 4 for achieving double sealing between the first push rod 2 and the threaded bushing 4, and the threaded connection fixing method is stable and reliable, the hexagon socket screw 14 and the hexagon nut 13 cooperate to tightly connect the threaded bushing 4 to the transmission case 5, and the O-ring 12, the sealing gasket 3 and the radial sealing ring 11 constitute a double sealing structure, which effectively prevents oil leakage and ensures the internal sealing performance of the transmission case 5.

[0026] See also Figure 1 In this embodiment, the guide sleeve 9 is fixed in the transmission housing 5, the guide sleeve 9 is sleeved on the outside of the cam follower 10, and the return spring 8 is located between the guide sleeve 9 and the cam follower 10. The guide sleeve 9 provides axial guidance for the cam follower 10 to ensure that its movement is stable and not deviated. The return spring 8 is installed between the guide sleeve 9 and the cam follower 10, and the force is evenly distributed, and the compression and return processes are controllable.

[0027] See also Figure 1 In this embodiment, a first threaded hole 21 is provided on the top of the transmission case 5, and a hexagonal bolt 7 is screwed onto the inner wall of the first threaded hole 21, and a push rod positioning hole 23 is provided at the rear end of the cam follower 10; when the first push rod 2 pushes the cam follower 10 to separate from the cam body 6, the hexagonal bolt 7 passes through the first threaded hole 21 and is inserted into the push rod positioning hole 23 to fix the cam follower 10 to the transmission case 5. The existing first threaded hole 21 on the top of the transmission case 5 and the push rod positioning hole 23 of the cam follower 10 are utilized to quickly fix them through the hexagonal bolt 7, without the need for additional processing parts, the operation is simple, and the fixing efficiency is improved.

[0028] See also Figure 1 In this embodiment, a threaded groove is provided at one end of the first push rod 2 away from the transmission box body 5, and a hexagonal head bolt 1 is threadedly installed on the inner wall of the threaded groove. The threaded groove cooperates with the hexagonal head bolt 1 to facilitate the use of tools to rotate the first push rod 2, saving effort and conveniently controlling the pushing stroke.

[0029] Example 2: Please refer to Figure 2-Figure 4The present application provides a technical solution: the mounting structure is a flange 18, and the fixing component is a second hexagon socket screw 17; the flange 18 is fixed to the top of the transmission case 5 by the second hexagon socket screw 17, and a second threaded hole 24 is provided in the center of the flange 18; the pushing component is a second push rod 16, and the second push rod 16 passes through the second threaded hole 24 in the center of the flange 18 and is threadedly connected to the flange 18, and the top side wall of the second push rod 16 is provided with a hexagonal nut 15 for fixing the axial position of the second push rod 16; the end of the cam follower 10 close to the center of the transmission case 5 is provided with an end cover 20, and the end cover 20 contacts the cam body 6, and the flange 18 is fixed to the top of the transmission case 5 by the second hexagon socket screw 17, and the installation is firm. The second push rod 16 is threadedly connected to the flange 18, and the axial position can be accurately fixed by cooperating with the hexagonal nut 15. The end cover 20 contacts the cam body 6, protects the end of the cam follower 10, and reduces wear.

[0030] See also Figure 2-Figure 4 In this embodiment, a follower positioning hole 25 is opened on the side wall of the cam follower 10 near the end cover 20, and the axis of the second push rod 16 is aligned with the axis of the follower positioning hole 25. The cam body 6 is installed in the transmission case 5 through the camshaft 19, and the bottom end of the second push rod 16 is inserted into the follower positioning hole 25 of the cam follower 10 to fix the axial position of the cam follower 10, so that the cam body 6 is moved away from the end cover 20 by rotating the camshaft 19, and the follower positioning hole 25 is aligned with the axis of the second push rod 16. After insertion, the positioning is accurate and the fixation is reliable; the cam body 6 can be separated by rotating the camshaft 19 without disassembling other components, which simplifies the operation steps and improves the disassembly efficiency.

[0031] See also Figure 2-Figure 4 In this embodiment, the guide sleeve 9 is fixedly connected to the transmission housing 5, the return spring 8 is sleeved on the outside of the cam follower 10 and located on the inside of the guide sleeve 9, and the guide sleeve 9 is fixedly connected to ensure the stable axial movement of the cam follower 10. The return spring 8 is sleeved on the outside of the follower and located on the inside of the guide sleeve 9. The structure is compact, the spring force is evenly transmitted, and the compression reset process is safe and controllable.

[0032] Working principle: When the cam body 6 needs to be disassembled, if the structure of embodiment 1 is adopted, the threaded bushing 4 is first fixed to the rear side of the transmission case 5 by means of a hexagon socket screw 14 and a hexagon nut 13, and the O-ring 12 realizes the sealing between the threaded bushing 4 and the transmission case 5. Then, the first push rod 2 is threadedly connected to the threaded bushing 4, and the sealing gasket 3 and the radial sealing ring 11 are used to realize the double sealing of the first push rod 2 and the threaded bushing 4. Then, the first push rod 2 is rotated by a tool to move it axially. The thread groove at one end of the first push rod 2 away from the transmission case 5 cooperates with the hexagon head bolt 1 to facilitate the application of force. The first push rod 2 abuts against the rear end of the cam follower 10 and pushes it to compress the return spring 8 located between the guide sleeve 9 and the cam follower 10, so that the cam follower 10 is separated from the cam body 6;

[0033] Then screw the hexagonal bolt 7 through the first threaded hole 21 on the top of the transmission housing 5 and insert it into the push rod positioning hole 23 at the rear end of the cam follower 10 to fix the cam follower 10 on the transmission housing 5. Finally, the cam body 6 can be removed through the through hole 22 on the transmission housing 5.

[0034] If the structure of Example 2 is adopted, the flange 18 is first fixed to the top of the transmission case 5 by the second hexagon socket screw 17, and the second threaded hole 24 in the center of the flange 18 is threadedly connected to the second push rod 16. The hexagonal head nut 15 on the side wall of the top end of the second push rod 16 is used to fix its axial position. The end cover 20 of the cam follower 10 close to the center end of the transmission case 5 contacts the cam body 6, and then the second push rod 16 is rotated so that its bottom end is inserted into the follower positioning hole 25 on the side wall of the cam follower 10 close to the end cover 20 to fix the axial position of the cam follower 10. At this time, the cam body 6 installed in the transmission case 5 through the camshaft 19 is rotated to keep it away from the end cover 20, so as to achieve separation from the cam follower 10. After that, the end cover 20 can be easily removed from the cam follower 10;

[0035] The guide sleeve 9 is fixed in the transmission case 5 or fixedly connected to the transmission case 5, the cam follower 10 is inserted into the guide sleeve 9 or the guide sleeve 9 is sleeved on the outside, the return spring 8 is sleeved on the outside of the cam follower 10 and is located on the inside of the guide sleeve 9 or between the guide sleeve 9 and the cam follower 10, ensuring that the cam follower 10 moves stably along the axial direction of the guide sleeve 9, and finally the cam body 6 and the end cover 20 are removed through the through hole 22. The whole process does not require disassembly of the pump head, inlet and outlet pipelines and hydraulic end components, nor does it require emptying the lubricating oil or hydraulic oil in the transmission case 5, thereby realizing rapid disassembly of the cam body 6.

Claims

1. A quick-disassembly tool for a cam wearing part with a spring-force closed structure, comprising a transmission housing (5), a cam body (6), a cam follower (10) cooperating with the cam body (6), a return spring (8) and a guide sleeve (9) arranged in the transmission housing (5), the cam follower (10) being inserted into the guide sleeve (9) and being movable axially along the guide sleeve (9), characterized in that: The invention also includes a mounting structure fixed to the transmission housing (5), wherein the mounting structure is provided with a fixing component connected to the transmission housing (5); the mounting structure is provided with a pushing component cooperating with the mounting structure, wherein the pushing component can move axially and abut against the rear end of the cam follower (10) or be inserted into the follower positioning hole (25) thereon, and is used to push the cam follower (10) to compress the return spring (8), so that the cam follower (10) is separated from the cam body (6), or the position of the cam follower (10) is fixed; and the transmission housing (5) is provided with a through hole (22) for disassembling the cam body (6).

2. The quick disassembly tool for cam wearing parts with a spring-force closed structure according to claim 1, characterized in that: The mounting structure is a threaded bushing (4), and the fixing component includes a hexagon socket screw (14) and a hexagon nut (13); the threaded bushing (4) is fixed to the rear side of the transmission housing (5) by means of the hexagon socket screw (14) and the hexagon nut (13), and an O-ring (12) is provided between the threaded bushing (4) and the transmission housing (5) for sealing; the pushing component is a first push rod (2), the first push rod (2) is threadedly connected to the threaded bushing (4), a sealing gasket (3) is provided on the first push rod (2), and a radial sealing ring (11) is provided in the threaded bushing (4) for achieving double sealing between the first push rod (2) and the threaded bushing (4).

3. The quick disassembly tool for a cam wearing part with a spring-force closed structure according to claim 2, characterized in that: The guide sleeve (9) is fixed in the transmission housing (5), the guide sleeve (9) is sleeved on the outer side of the cam follower (10), and the return spring (8) is located between the guide sleeve (9) and the cam follower (10).

4. The quick disassembly tool for a cam wearing part with a spring-force closed structure according to claim 2, characterized in that: A first threaded hole (21) is provided on the top of the transmission housing (5), a hexagonal bolt (7) is screwed onto the inner wall of the first threaded hole (21), and a push rod positioning hole (23) is provided at the rear end of the cam follower (10); when the first push rod (2) pushes the cam follower (10) to separate from the cam body (6), the hexagonal bolt (7) passes through the first threaded hole (21) and is inserted into the push rod positioning hole (23), thereby fixing the cam follower (10) to the transmission housing (5).

5. The quick disassembly tool for a cam wearing part with a spring-force closed structure according to claim 2, characterized in that: A threaded groove is formed at one end of the first push rod (2) away from the transmission housing (5), and a hexagonal head bolt (1) is threadedly mounted on the inner wall of the threaded groove.

6. The quick disassembly tool for a cam wearing part with a spring-force closed structure according to claim 1, characterized in that: The mounting structure is a flange (18), and the fixing component is a second hexagon socket screw (17); the flange (18) is fixed to the top of the transmission housing (5) by the second hexagon socket screw (17), and a second threaded hole (24) is provided in the center of the flange (18); the pushing component is a second push rod (16), and the second push rod (16) passes through the second threaded hole (24) in the center of the flange (18) and is threadedly connected to the flange (18), and a second hexagonal nut (15) is provided on the top side wall of the second push rod (16) for fixing the axial position of the second push rod (16); an end cover (20) is provided at one end of the cam follower (10) close to the center of the transmission housing (5), and the end cover (20) is in contact with the cam body (6).

7. The quick disassembly tool for a cam wearing part with a spring-force closed structure according to claim 6, characterized in that: A follower positioning hole (25) is provided on a side wall of the cam follower (10) close to the end cover (20), the axis of the second push rod (16) is aligned with the axis of the follower positioning hole (25), the cam body (6) is installed in the transmission housing (5) through the cam shaft (19), and the bottom end of the second push rod (16) is inserted into the follower positioning hole (25) of the cam follower (10) to fix the axial position of the cam follower (10), so that the cam body (6) is moved away from the end cover (20) by rotating the cam shaft (19).

8. The quick disassembly tool for a cam wearing part with a spring-force closed structure according to claim 6, characterized in that: The guide sleeve (9) is fixedly connected to the transmission housing (5), and the return spring (8) is sleeved on the outside of the cam follower (10) and located on the inside of the guide sleeve (9).

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