Multi-pipe joint workpiece air tightness test clamp

Abstract

The utility model discloses an air tightness test fixture for a multi-pipe joint type workpiece, which can automatically provide uniform pressing force, is higher in positioning accuracy, can be stably and tightly attached to the workpiece, and is higher in detection efficiency. The positioning device comprises a supporting frame and is characterized in that a vertical positioning structure is arranged between a top plate and a bottom plate of the supporting frame, and a horizontal positioning structure is arranged between a left vertical plate and a right vertical plate of the supporting frame.

Description

Technical Field

[0001] The utility model relates to the technical field of air tightness detection and positioning fixtures, and specifically to an air tightness test fixture for a multi-tube joint type workpiece. Background Art

[0002] Multi-tube joints are mostly used in engineering machinery. Such workpieces require higher positioning accuracy to detect the air tightness of the workpieces. The existing positioning fixtures are mainly manual fixtures. When the manual fixtures are used to position the workpieces, the positioning accuracy is low due to the uneven manual clamping force. The state of the positioning fixture tightly fitting the workpiece is unstable, and the detection efficiency is low. Utility Model Content

[0003] In order to solve the shortcomings of manual clamps for positioning workpieces, such as uneven manual pressing force, low positioning accuracy, unstable state of the positioning clamp fitting closely to the workpiece, and low detection efficiency, the utility model provides a multi-tube joint workpiece air tightness test fixture, which can automatically provide uniform pressing force, has high positioning accuracy, and the fixture can stably and tightly fit the workpiece, and has high detection efficiency.

[0004] The utility model provides the following technical solution: it includes a support frame, characterized in that a vertical positioning structure is arranged between the top plate and the bottom plate of the support frame, and a horizontal positioning structure is arranged between the left vertical plate and the right vertical plate of the support frame.

[0005] It is further characterized by:

[0006] The left vertical plate of the support frame is provided with two mutually symmetrical stress grooves, and the lower end of the right vertical plate of the support frame is provided with a stress groove;

[0007] The vertical positioning structure includes a positioning plug and a vertical pressure block. A positioning plug is installed on the surface of the bottom plate near the stress groove at the lower end of the left vertical plate. The head of the positioning plug is set as a round boss matched with the workpiece, and an airtight detection channel is set inside. The positioning plug initially limits and fixes the workpiece. The vertical pressure block is located directly above the positioning plug and has two pressure heads matched with the arc surface of the workpiece at the lower end. The head of the vertical pressure block is clamped in the inner groove at the bottom end of the first connecting block. The first connecting block is installed at the end of the piston rod head of the top plate cylinder that passes through the top plate and extends out after the top plate. A stopper is provided at the connection between the first connecting block and the piston rod of the top plate cylinder. The stopper is installed on the lower surface of the top plate. The clamping groove of the stopper is matched with the first connecting block to have a fixing and supporting effect on it.

[0008] The horizontal positioning structure includes a limit block and a movable plug, the limit blocks are installed in parallel on both sides of the stress groove at the lower end of the left vertical plate, the end surface of the extended end of the limit block is a positioning surface for positioning the workpiece, a push block, a second connecting block and a side plate cylinder are sequentially arranged behind the movable plug, the push block is embedded above the stress groove of the right vertical plate, the movable plug is clamped in parallel at one end of the push block, a connecting groove is arranged at the other end of the push block, the head of the second connecting block is clamped in the connecting groove and connected with the push block, and the piston rod head of the side plate cylinder arranged above the stress groove of the right vertical plate is fixedly connected to the tail of the second connecting block;

[0009] Fixed support blocks are arranged in parallel above and below the piston rod head of the side plate cylinder, and the side plate cylinder is fixedly connected to the right vertical plate through the fixed support block.

[0010] In the above technical solution, the technical effects and advantages provided by the utility model are:

[0011] The positioning plug in the vertical positioning structure is matched with the bottom of the workpiece to initially limit and fix the workpiece. Then, the first connection block connected to the top plate cylinder cooperates with the stopper to ensure that the vertical pressure block can be stably pressed downward. The two pressure heads on the vertical pressure block are matched with the arc surface of the workpiece to press the workpiece, and the workpiece is further limited. With the cooperation of the positioning plug and the vertical pressure block, the vertical surface of the workpiece will be accurately positioned.

[0012] In the horizontal positioning structure, the limit block limits and fixes the two ends of the positioning surface of the workpiece from the left side, and the side plate cylinder stably pushes the push block through the second connecting block. Then the push block pushes the movable plug of the head firmly from the right side to fit tightly with the two through pipes on the workpiece. The limit block and the movable plug cooperate to accurately position the horizontal surface of the workpiece.

[0013] The workpiece will be accurately positioned under the combination of the vertical positioning structure and the horizontal positioning structure, and the oil cylinder has a fast positioning speed and high accuracy. It is very firm and will not affect the air tightness detection due to insufficient positioning accuracy. It improves the positioning speed and positioning accuracy, and improves the efficiency of workpiece air tightness detection.

[0014] The stress groove can disperse the stress concentration on the vertical plate. The setting of the stress groove greatly increases the load-bearing strength and stability of the left and right vertical plates, provides stable support for the vertical positioning structure and the horizontal positioning structure, and further increases the stability of the structure;

[0015] An air tightness detection channel is set on the side of the positioning plug. The workpiece can be tested by simply connecting to the external detection equipment, which is very convenient and greatly improves the detection efficiency.

[0016] The fixed support block ensures that the side panel cylinder is stably installed on the right vertical plate. It increases the connection distance between the cylinder and the right vertical plate, provides room for movement of the cylinder rod of the second connection block and the side panel cylinder, and provides guarantee for the stable side pressure of the side panel cylinder and the second connection block. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 3 This is a schematic diagram of the vertical pressing block installation structure of the utility model;

[0020] Figure 4 This is a schematic diagram of the vertical pressing block connection structure of the utility model;

[0021] Figure 5 This is a schematic diagram of the structure of the push block embedded in the right vertical plate of the utility model;

[0022] Figure 6 It is an exploded view of the push block connection structure of the utility model;

[0023] Figure 7 This is a cross-sectional view of the positioning plug structure of the utility model;

[0024] Figure 8 It is a schematic diagram of a workpiece of the present utility model.

[0025] Description of reference numerals:

[0026] 1. Top plate; 2. Bottom plate; 3. Left vertical plate; 4. Right vertical plate; 5. Vertical pressure block; 6. First connecting block; 7. Stop block; 8. Positioning plug; 9. Limit block; 10. Movable plug; 11. Push block; 12. Second connecting block; 13. Fixed support block; 14. Top plate cylinder; 15. Side plate cylinder; 16. Stress groove. DETAILED DESCRIPTION

[0027] The utility model provides Figure 1-Figure 8 A multi-tube joint workpiece air tightness test fixture is shown, which includes a support frame, a left vertical plate 3 of the support frame is provided with two mutually symmetrical stress grooves 16, a stress groove 16 is provided at the lower end of the right vertical plate 4, a vertical positioning structure is provided between the top plate 1 and the bottom plate 2 of the support frame, and a horizontal positioning structure is provided between the left vertical plate 3 and the right vertical plate 4;

[0028] The vertical positioning structure includes a positioning plug 8 and a vertical pressure block 5. A positioning plug 8 is installed on the surface of the bottom plate 2 near the stress groove at the lower end of the left vertical plate 3 (see Figure 2), the head of the positioning plug 8 is set as a round boss that matches the workpiece, and an airtight detection channel is set inside it (see Figure 7 ), the positioning plug 8 initially limits and fixes the workpiece, the vertical pressure block 5 is located directly above the positioning plug 8 and has two pressure heads adapted to the arc surface of the workpiece at the lower end, the head of the vertical pressure block 5 is clamped in the inner groove at the bottom end of the first connecting block 6, the first connecting block 6 is installed at the end of the piston rod head of the top plate cylinder 14 that passes through the top plate 1 and extends out, there is a stopper 7 at the connection between the first connecting block 6 and the piston rod of the top plate cylinder 14, and the stopper 7 is installed on the lower surface of the top plate 1 (see Figure 3 ), the clamping groove of the stopper 7 is matched with the first connecting block 6, which has a fixing and supporting function, and the vertical pressing block 5 stably presses the workpiece on the positioning plug 8, and the workpiece will be fixed and clamped in the vertical direction;

[0029] The horizontal positioning structure includes a limit block 9 and a movable plug 10. The limit block 9 is installed in parallel on both sides of the stress groove 16 at the lower end of the left vertical plate 3. The end surface of the extended end of the limit block 9 is the positioning surface for positioning the workpiece (see Figure 1 ), a push block 11, a second connecting block 12 and a side plate cylinder 15 are sequentially arranged behind the movable plug 10, the push block 11 is inlaid above the stress groove 16 of the right vertical plate 4, the movable plug 10 is clamped in parallel at one end of the push block 11, and a connecting groove is arranged at the other end of the push block 11, the head of the second connecting block 12 is clamped in the connecting groove and connected to the push block 11, and the piston rod head of the side plate cylinder 15 arranged above the stress groove 16 of the right vertical plate 4 is fixedly connected to the tail of the second connecting block 12 (see Figure 5 ), by starting the side plate cylinder 15 to push the movable plug 10 to move and press the workpiece to the right, and cooperate with the limit block 9 to position the workpiece horizontally;

[0030] See Figure 2 A fixed support block 13 is arranged in parallel above and below the piston rod head of the side plate cylinder 15, and the side plate cylinder 15 is fixedly connected to the right vertical plate 4 through the fixed support block 13.

[0031] Working principle of this utility model:

[0032] Refer to the instruction manual Figure 1-Figure 8 When using the utility model, first, put the large hole at the bottom of the part on the positioning plug 8, fit the limit block 9 on the left side of the workpiece positioning surface, and align the two holes on the head of the workpiece with the movable plug 10, then start the top plate cylinder 14 and the side plate cylinder 15 to push the vertical pressure block 5 and the movable plug 10 to position and fix the workpiece. When the pressure head of the vertical pressure block 5 and the movable plug 10 are tightly fitted to the workpiece, the positioning is completed, and the positioning plug 8 is connected to the air tightness detection equipment with an air pipe. After ventilation and reaching inflation balance, observe whether there is any leakage in other places such as the part hole and the air pipe joint, observe whether the equipment detection result is qualified, and then reset the equipment to take out the part, ensure the positioning accuracy of the part, and improve the detection efficiency.

Claims

1. A multi-tube joint workpiece air tightness test fixture, comprising a support frame, characterized in that: A vertical positioning structure is arranged between the top plate and the bottom plate of the support frame, and a horizontal positioning structure is arranged between the left vertical plate and the right vertical plate of the support frame.

2. The multi-tube joint workpiece air tightness test fixture according to claim 1, characterized in that: The left vertical plate of the support frame is provided with two mutually symmetrical stress grooves, and the lower end of the right vertical plate of the support frame is provided with a stress groove.

3. A multi-tube joint workpiece air tightness test fixture according to claim 1 or 2, characterized in that: The vertical positioning structure includes a positioning plug and a vertical pressure block. A positioning plug is installed on the surface of the bottom plate near the stress groove at the lower end of the left vertical plate. The head of the positioning plug is set as a circular boss that matches the workpiece, and an airtight detection channel is set inside. The positioning plug initially limits and fixes the workpiece. The vertical pressure block is located directly above the positioning plug and has two pressure heads that match the arc surface of the workpiece at the lower end. The head of the vertical pressure block is clamped in the inner groove at the bottom end of the first connecting block. The first connecting block is installed at the end of the piston rod head of the top plate cylinder that extends out after passing through the top plate. There is a block at the connection between the first connecting block and the piston rod of the top plate cylinder. The block is installed on the lower surface of the top plate. The clamping groove of the block is compatible with the first connecting block and has a fixing and supporting effect on it.

4. The multi-tube joint workpiece air tightness test fixture according to claim 3, characterized in that: The horizontal positioning structure includes a limit block and a movable plug, the limit blocks are installed in parallel on both sides of the stress groove at the lower end of the left vertical plate, the end surface of the protruding end of the limit block is a positioning surface for positioning the workpiece, a push block, a second connecting block and a side plate cylinder are sequentially arranged behind the movable plug, the push block is embedded above the stress groove of the right vertical plate, the movable plug is clamped in parallel at one end of the push block, and a connecting groove is arranged at the other end of the push block, the head of the second connecting block is clamped in the connecting groove and connected to the push block, and the head of the piston rod extending from the side plate cylinder arranged above the stress groove of the right vertical plate is fixedly connected to the tail of the second connecting block.

5. The multi-tube joint workpiece air tightness test fixture according to claim 4, characterized in that: Fixed support blocks are arranged in parallel above and below the piston rod head of the side plate cylinder, and the side plate cylinder is fixedly connected to the right vertical plate through the fixed support block.

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