A special positioning fixture for valve body machining

Abstract

This utility model relates to the field of valve body processing technology and discloses a special positioning fixture for valve body processing, including a clamping platform and a dual-channel valve body. Positioning seat one and positioning seat two are fixedly installed on the clamping platform. A positioning point is fixedly installed at the end of positioning seat one away from the clamping platform. A centering reference point and a side positioning reference point are provided at the end of positioning seat one away from the clamping platform. The dual-channel valve body is located at the end of positioning seat one and positioning seat two away from the clamping platform, and the dual-channel valve body is in contact with the centering reference point and the side positioning reference point. A pressing cylinder one, a pressing cylinder two, a pushing cylinder, and a pressing cylinder three are fixedly installed on the clamping platform. This special positioning fixture for valve body processing uses an automatic internal cavity centering method for the automatic centering reference point, which can effectively avoid the phenomenon of external hole deviation caused by inconsistent blank outlines. The automatic internal cavity centering method can effectively avoid the problems of black skin leakage in the internal flow channel and out-of-tolerance line outlines.

Description

Technical Field

[0001] This utility model relates to the field of valve body processing technology, specifically a special positioning fixture for valve body processing. Background Technology

[0002] In chemical, petroleum, metallurgical, and automation control fields, valve bodies are often used to regulate flow. As a type of valve body, the dual-channel valve body is widely used in aerospace, automotive manufacturing, chemical, and energy fields because it can precisely control the flow direction, pressure, and flow rate of two different fluid media. Due to the complex internal structure of the dual-channel valve body, it requires extremely high machining accuracy. Ordinary positioning fixtures are difficult to meet its machining needs, so special positioning fixtures are often used for production to avoid damage during production.

[0003] Chinese Utility Model Patent Publication No. CN219152246U discloses a special fixture for processing electromagnetic valve bodies. The specification of this fixture describes a mechanism that uses a rotating component to drive a drive rod, which, in conjunction with a second clamping plate and a second clamping rod, clamps the product against the first clamping plate and rod. This allows for clamping the product and, after processing one side, angle adjustment to process the other side, thus avoiding cumbersome disassembly and improving valve body processing efficiency. However, this special fixture for processing electromagnetic valve bodies lacks a corresponding clamping structure, which can easily lead to misalignment of the external holes during processing of dual-channel valve bodies and problems such as black film leakage from the internal flow channels. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a special positioning fixture for valve body processing. It can effectively solve the problems in the prior art, such as the lack of a corresponding clamping structure, which easily leads to the deviation of the appearance hole during the processing of dual-channel valve bodies, and the easy occurrence of black skin leakage in the inner cavity flow channel.

[0005] The technical solution adopted by this utility model is: a special positioning fixture for valve body processing, including a clamping platform and a dual-channel valve body. Positioning seat one and positioning seat two are fixedly installed on the clamping platform. A positioning point is fixedly installed at the end of positioning seat one away from the clamping platform. A centering reference point and a side positioning reference point are set at the end of positioning seat one away from the clamping platform. The dual-channel valve body is located at the end of positioning seat one and positioning seat two away from the clamping platform. The dual-channel valve body is in contact with the centering reference point and the side positioning reference point. A pressing cylinder one, a pressing cylinder two, a pushing cylinder and a pressing cylinder three are fixedly installed on the clamping platform. The pressing cylinder one, pressing cylinder two, pushing cylinder and pressing cylinder three are respectively located around the dual-channel valve body.

[0006] Preferably, a connector is provided on the output end of the first pressing cylinder, a pressing block is provided at the end of the connector away from the first pressing cylinder, and a pressing rod is fixedly installed at the end of the pressing block away from the connector, and the pressing rod is in contact with the dual-channel valve body.

[0007] Through the above technical solution, the lowering cylinder drives the lowering block and lowering rod through the connector, which facilitates the clamping of the dual-channel valve body and avoids hole deviation during processing due to insufficient clamping force.

[0008] Preferably, a fixed pressure block is fixedly installed on the output of the second pressure cylinder, and the fixed pressure block abuts against the dual channels.

[0009] The above technical solution uses a two-stage downward-pressing cylinder to drive a fixed pressure block against the side of the valve body. This lateral pressing ensures the positional stability of the valve body during processing, further reducing hole machining offset caused by positioning deviations and thus improving machining accuracy.

[0010] Preferably, there are two identical lowering cylinders and fixed pressure blocks, and the two lowering cylinders and fixed pressure blocks are symmetrically distributed about the center line of the dual-channel valve body.

[0011] The above technical solution uses two sets of symmetrically distributed downward pressure cylinders and fixed pressure blocks to balance the pressure applied to both sides of the valve body, avoiding valve body deformation caused by unilateral clamping. At the same time, it can automatically center the inner cavity with the centering reference point, avoiding positioning errors caused by inconsistent blank shapes.

[0012] Preferably, a push rod is fixedly installed on the output shaft of the push cylinder, and the push rod abuts against the dual-channel valve body.

[0013] Through the above technical solution, by pushing the cylinder to drive the push rod to press against the end face of the valve body, the pushing force of the push rod can compensate for the insufficient rigidity of the deep cavity structure of the valve body, prevent vibration caused by cutting force during the machining of the flow channel, avoid black skin leakage in the inner cavity flow channel during machining, and improve the contour accuracy of the flow channel during machining.

[0014] Preferably, a positioning block is fixedly installed at the three output ends of the downward pressure cylinder, and the positioning block overlaps with the edge of the channel valve body.

[0015] The above technical solution uses a three-drive positioning block of the lower cylinder to overlap the edge of the valve body, forming an edge constraint in the three-point positioning. With the overlapping surface of the positioning block matching the edge contour of the valve body, the circumferential rotation of the valve body can be restricted. Combined with the side positioning reference, multi-angle positioning can be achieved, avoiding the problem of line contour deviation caused by edge wobbling.

[0016] Preferably, at least two identical dual-channel valve bodies are provided, with the two dual-channel valve bodies located above positioning seat one and positioning seat two, respectively, and the two dual-channel valve bodies facing opposite directions.

[0017] The above technical solution allows for the simultaneous processing of valve bodies by symmetrically arranging two sets of dual-channel valve bodies on the clamping platform, facing opposite directions. The practicality can be improved by sharing positioning seat one and positioning seat two.

[0018] Compared with the prior art, this utility model provides a special positioning fixture for valve body processing, which has the following advantages: 1. The valve body machining special positioning fixture uses an automatic centering reference point with an internal cavity automatic centering method, which can effectively avoid the phenomenon of appearance hole deviation caused by inconsistent blank outer contour. The internal cavity automatic centering method can effectively avoid the problems of black skin leakage in the internal cavity flow channel and line contour deviation. 2. This valve body machining special positioning fixture has two sets of dual-channel valve bodies symmetrically set on the clamping platform, facing opposite directions, so that the valve body can be machined simultaneously. By sharing positioning seat one and positioning seat two, its machining efficiency can be improved, thus facilitating its widespread use. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the mounting structure of the clamp and dual-channel valve body of this utility model; Figure 4 This is a schematic diagram of the disassembled structure of the positioning seat and the dual-channel valve body of this utility model; Figure 5 This is a schematic diagram of the disassembled structure of the positioning seat 2 and the dual-channel valve body of this utility model.

[0020] The components are: 1. Clamping platform; 2. Positioning seat one; 3. Positioning point; 4. Dual-channel valve body; 5. Pressing cylinder one; 6. Connector; 7. Pressing block; 8. Pressing rod; 9. Pressing cylinder two; 10. Fixed pressure block; 11. Positioning seat two; 12. Pushing cylinder; 13. Push rod; 14. Pressing cylinder three; 15. Positioning block; 16. Centering reference point; 17. Side positioning reference. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Example 1: As Figure 1-5 As shown, the present invention provides a special positioning fixture for valve body processing, including a clamping platform 1 and a dual-channel valve body 4. A positioning seat 1 2 and a positioning seat 2 11 are fixedly installed on the clamping platform 1. A positioning point 3 is fixedly installed at the end of the positioning seat 1 2 away from the clamping platform 1. A centering reference point 16 and a side positioning reference 17 are provided at the end of the positioning seat 1 2 away from the clamping platform 1. The dual-channel valve body 4 is located at the end of the positioning seat 1 2 and the positioning seat 2 11 away from the clamping platform 1. The dual-channel valve body 4 is in contact with the centering reference point 16 and the side positioning reference 17. A pressing cylinder 1 5, a pressing cylinder 2 9, a pushing cylinder 12 and a pressing cylinder 3 14 are fixedly installed on the clamping platform 1. The pressing cylinder 1 5, the pressing cylinder 2 9, the pushing cylinder 12 and the pressing cylinder 3 14 are respectively located around the dual-channel valve body 4.

[0023] Specifically, a connector 6 is provided on the output end of the pressure cylinder 5. A pressure block 7 is provided at the end of the connector 6 away from the pressure cylinder 5. A pressure rod 8 is fixedly installed at the end of the pressure block 7 away from the connector 6. The pressure rod 8 is in contact with the dual-channel valve body 4. The advantage is that the pressure cylinder 5 drives the pressure block 7 and the pressure rod 8 through the connector 6, which facilitates the clamping of the dual-channel valve body 4 and avoids hole deviation during processing due to insufficient clamping force.

[0024] Specifically, a fixed pressure block 10 is fixedly installed on the output of the second pressing cylinder 9. The fixed pressure block 10 abuts against the dual channel 4. The advantage is that by driving the fixed pressure block 10 to press against the side of the valve body through the second pressing cylinder 9, the positional stability of the valve body during processing is ensured by lateral pressing, which can further reduce the hole processing offset caused by positioning deviation, thereby improving the processing accuracy.

[0025] Specifically, there are two identical pressure cylinders 9 and fixed pressure blocks 10. The two pressure cylinders 9 and fixed pressure blocks 10 are symmetrically distributed about the center line of the dual-channel valve body 4. The advantage is that the pressure applied to both sides of the valve body can be balanced by the two sets of symmetrically distributed pressure cylinders 9 and fixed pressure blocks 10, avoiding valve body deformation caused by unilateral pressing. At the same time, in conjunction with the centering reference point 16, the inner cavity can be automatically centered, which can avoid the problem of positioning error caused by inconsistent blank shape.

[0026] Example 2: Figure 3-4 As shown, this is an improvement on the previous embodiment.

[0027] Specifically, a push rod 13 is fixedly installed on the output shaft of the push cylinder 12. The push rod 13 abuts against the dual-channel valve body 4. The advantage is that by pushing the cylinder 12 to drive the push rod 13 to press against the end face of the valve body, the thrust of the push rod 13 can compensate for the insufficient rigidity of the deep cavity structure of the valve body, prevent vibration caused by cutting force during the machining of the flow channel, avoid black skin leakage in the inner cavity flow channel during machining, and improve the contour accuracy during flow channel machining.

[0028] Specifically, a positioning block 15 is fixedly installed at the output end of the lower cylinder 14. The positioning block 15 overlaps with the edge of the channel valve body 4. The advantage is that by driving the positioning block 15 to overlap with the edge of the valve body through the lower cylinder 14, an edge constraint is formed in the three-point positioning. With the overlapping surface of the positioning block 15 matching the edge contour of the valve body, the circumferential rotation of the valve body can be restricted. With the side positioning reference 17, multi-angle positioning can be achieved, avoiding the problem of line contour deviation caused by edge shaking.

[0029] Specifically, at least two identical dual-channel valve bodies 4 are provided. The two dual-channel valve bodies 4 are located above the positioning seat 1 2 and the positioning seat 2 11, respectively. The two dual-channel valve bodies 4 face opposite directions. The advantage is that by symmetrically setting two sets of dual-channel valve bodies 4 on the clamping platform 1 with opposite directions, the valve body can be processed synchronously. By sharing the positioning seat 1 2 and the positioning seat 2 11, its practicality can be improved.

[0030] Working Principle: During use, the first pressing cylinder 5 drives the pressing block 7 and the pressing rod 8 through the connector 6, facilitating the clamping of the dual-channel valve body 4. This prevents hole misalignment during machining due to insufficient clamping force. The second pressing cylinder 9 drives the fixed pressing block 10 to press against the side of the valve body, ensuring the positional stability of the valve body during machining through lateral clamping. This further reduces hole machining offset caused by positioning deviation, thereby improving machining accuracy. The two sets of symmetrically distributed pressing cylinders 9 and fixed pressing blocks 10 balance the pressure applied to both sides of the valve body, preventing valve body deformation caused by unilateral clamping. At the same time, the centering reference point 16 enables automatic centering of the inner cavity, avoiding positioning errors caused by inconsistent blank shapes. The cylinder is pushed... 12 Drive push rod 13 presses against the valve body end face. The thrust of push rod 13 can compensate for the insufficient rigidity of the deep cavity structure of the valve body, prevent vibration caused by cutting force during the machining of the flow channel, avoid black skin leakage in the inner cavity flow channel during machining, and improve the contour accuracy of the flow channel during machining. The lower cylinder 14 drives the positioning block 15 to overlap the edge of the valve body, forming the edge constraint in the three-point positioning. With the overlapping surface of the positioning block 15 matching the edge contour of the valve body, the circumferential rotation of the valve body can be restricted. With the side positioning reference 17, multi-angle positioning can be achieved, avoiding the problem of line contour deviation caused by edge shaking. By symmetrically setting two sets of double-channel valve bodies 4 on the clamping table 1 with opposite orientations, the valve body can be machined synchronously. By sharing the positioning seat 1 2 and positioning seat 2 11, its practicality can be improved.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A positioning fixture for valve body machining, comprising a clamping table (1) and a double-pass valve body (4), characterized in that: Positioning seat one (2) and positioning seat two (11) are fixedly installed on the clamping platform (1). Positioning seat one (2) is fixedly installed with a positioning point (3) at the end away from the clamping platform (1). Positioning seat one (2) is provided with a centering reference point (16) and a side positioning reference point (17) at the end away from the clamping platform (1). The dual-channel valve body (4) is located at the end of positioning seat one (2) and positioning seat two (11) away from the clamping platform (1). The dual-channel valve body (4) is in contact with the centering reference point (16) and the side positioning reference point (17). Downward pressing cylinder one (5), downward pressing cylinder two (9), pushing cylinder (12) and downward pressing cylinder three (14) are fixedly installed on the clamping platform (1). Downward pressing cylinder one (5), downward pressing cylinder two (9), pushing cylinder (12) and downward pressing cylinder three (14) are located around the dual-channel valve body (4) respectively.

2. The positioning fixture for machining valve body according to claim 1, characterized in that: A connector (6) is provided on the output end of the first pressing cylinder (5). A pressing block (7) is provided on the end of the connector (6) away from the first pressing cylinder (5). A pressing rod (8) is fixedly installed on the end of the pressing block (7) away from the connector (6). The pressing rod (8) is in contact with the dual-channel valve body (4).

3. The positioning fixture for machining valve body according to claim 1, characterized in that: A fixed pressure block (10) is fixedly installed on the output of the second (9) pressure cylinder, and the fixed pressure block (10) abuts against the dual-channel valve body (4).

4. The positioning fixture for machining valve body according to claim 3, characterized in that: Two identical pressure cylinders (9) and fixed pressure blocks (10) are provided, and the two pressure cylinders (9) and fixed pressure blocks (10) are symmetrically distributed about the center line of the dual-channel valve body (4).

5. The positioning fixture for machining valve body according to claim 1, characterized in that: A push rod (13) is fixedly installed on the output shaft of the push cylinder (12), and the push rod (13) abuts against the dual-channel valve body (4).

6. The positioning fixture for machining valve body according to claim 1, characterized in that: A positioning block (15) is fixedly installed at the output end of the three-stage (14) pressure cylinder, and the positioning block (15) overlaps with the edge of the dual-channel valve body (4).

7. The positioning fixture for machining valve body according to claim 1, characterized in that: At least two identical dual-channel valve bodies (4) are provided, with the two dual-channel valve bodies (4) located above positioning seat one (2) and positioning seat two (11) respectively, and the two dual-channel valve bodies (4) facing opposite directions.

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