Inner expansion mechanism of round pipe

Abstract

The utility model provides a circular tube internal expansion mechanism, which is suitable for the technical field of welding tools, and adopts the scheme that the circular tube internal expansion mechanism comprises a cylinder main body, a pipeline main body, a support frame, a fixing plate, an expansion table and an ejector rod, the pipeline main body is arranged above the cylinder main body, the top of the cylinder main body is fixedly connected with the support frame, and the fixing plate is arranged on the support frame. A fixing plate is fixedly connected to the upper surface of the supporting frame, an expansion table is fixedly connected to the upper surface of the fixing plate, an ejector rod is slidably installed on the inner wall of the air cylinder body, and by installing the air cylinder body, the pipeline body, the supporting frame, the fixing plate, the expansion table and the ejector rod, upward pushing force of the ejector rod is converted into uniform expansion force in the direction perpendicular to the two sides. The pressed blocks make contact with the inner wall of the pipeline body, and the pipeline with the diameter smaller than 40 mm is expanded and clamped; the utility model is also applicable to the field of welding tools.

Description

Technical Field

[0001] The utility model relates to the technical field of welding tooling, in particular to a round tube internal expansion mechanism. Background Art

[0002] In the design of welding tooling, we often encounter mechanisms that need to use the inner wall of a hollow tube as a positioning reference. There are such standardized positioning mechanisms on the market, but due to the large size of the mechanism itself, it is only suitable for positioning parts with a hole diameter greater than 40mm. Parts with a hole diameter greater than 40mm cannot be placed inside the existing positioning mechanism.

[0003] Therefore, a centering mechanism below 40mm was developed. This mechanism uses a cylinder to drive a self-made special top core and extrusion block to convert the cylinder's pushing force into a uniform expanding force in the vertical direction, thereby achieving the function of clamping and positioning the inner wall of the round tube.

[0004] Therefore, it is necessary to provide a new circular tube internal expansion mechanism to solve the above-mentioned technical problems. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a circular tube internal expansion mechanism.

[0006] The circular tube internal expansion mechanism provided by the utility model comprises: a cylinder body, a pipe body, a support frame, a fixed plate, an expansion platform and a push rod, a pipe body is arranged above the cylinder body, the top of the cylinder body is fixedly connected with the support frame, the upper surface of the support frame is fixedly connected with the fixing plate, the upper surface of the fixing plate is fixedly connected with the expansion platform, the inner wall of the cylinder body is slidably mounted with a push rod, the pipe body is sleeved on the surface of the expansion platform, the cylinder body is started, the cylinder body controls the extension of the push rod, the push rod enters the interior of the expansion platform, expands and clamps the inner wall of the pipe body, the support frame provides support, and the fixed plate firmly connects the support frame and the expansion platform.

[0007] Preferably, a connecting hole is opened on the top of the support frame and inside the fixing plate, and the top rod is slidably connected with the connecting hole. During the extension and retraction process of the top rod, it will pass through the connecting hole, which facilitates the rapid passage of the top rod.

[0008] Preferably, an extrusion block is fixedly connected to the top of the push rod, and a pressure block is symmetrically and slidably connected to the inner wall of the expansion platform. Four guide grooves are symmetrically provided on the inner wall of the expansion platform. During the extension of the push rod, the extrusion block is driven to squeeze the pressure block, and the pressure block is moved out of the expansion platform. The pressure block contacts the inner wall of the pipe body, and the inner wall of the pipe body is expanded and clamped.

[0009] Preferably, guide blocks are symmetrically fixedly connected to the surfaces of the two pressure blocks, and the guide blocks slide on the inner walls of the guide grooves. Reset springs are fixedly connected to the surfaces of the two guide blocks, and the side of the reset spring away from the guide blocks is fixedly connected to the inner wall of the guide groove. In the process of the pressure blocks moving out of the expansion platform, the guide blocks slide along the inner walls of the guide grooves to ensure horizontal movement of the pressure blocks. When the reset springs are stretched and the push rods are contracted and the extrusion blocks no longer squeeze the pressure blocks, the reset springs are reset and contracted, driving the guide blocks to reset and retract the pressure blocks into the expansion platform.

[0010] Preferably, the sides of the two pressure blocks are provided with rounded corners to reduce the friction force on the sides of the pressure blocks, and when the pressure blocks squeeze the inner wall of the pipe body, the wear on the inner wall of the pipe body is reduced, thereby improving the practicality of the pressure blocks.

[0011] Preferably, the top of the extruding block and the bottom of the pressure block are designed in a sloped manner, so that when the extruding block extrudes the pressure block, the upward pushing force is converted into a uniform expanding force in the vertical directions on both sides.

[0012] Preferably, the support frame is made of stainless steel, which has high hardness and tensile resistance. During use, the surface of the support frame is squeezed or collided, and will not easily wear or dent, thereby extending the service life of the support frame.

[0013] Compared with the related art, the circular tube internal expansion mechanism provided by the utility model has the following beneficial effects:

[0014] The utility model provides a circular tube internal expansion mechanism:

[0015] 1. By installing the cylinder body, pipe body, support frame, fixing plate, expansion table and ejector rod, the upward push force of the ejector rod is converted into a uniform expansion force in the vertical direction on both sides. The pressure block contacts the inner wall of the pipe body to expand and clamp the pipe below 40mm.

[0016] 2. Guide blocks are symmetrically fixedly connected to the surfaces of the two pressure blocks, and the guide blocks slide on the inner walls of the guide grooves. Reset springs are fixedly connected to the surfaces of the two guide blocks, and the side of the reset spring away from the guide blocks is fixedly connected to the inner wall of the guide groove. In the process of the pressure blocks moving out of the expansion table, the guide blocks slide along the inner walls of the guide grooves to ensure the horizontal movement of the pressure blocks. When the reset springs are stretched and the push rods are contracted and the extrusion blocks no longer squeeze the pressure blocks, the reset springs are reset and contracted, driving the guide blocks to reset and retract the pressure blocks into the expansion table. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The overall structural diagram provided by the utility model;

[0018] Figure 2 A schematic diagram of the separation structure provided by the utility model;

[0019] Figure 3 This is one of the cross-sectional schematic diagrams of the expansion table provided by the utility model;

[0020] Figure 4 The second cross-sectional schematic diagram of the expansion platform provided by the utility model.

[0021] Numbers in the figure: 1. Cylinder body; 2. Pipe body; 3. Support frame; 4. Fixing plate; 5. Expansion table; 6. Push rod; 7. Connecting hole; 8. Extrusion block; 9. Pressure block; 10. Guide groove; 11. Guide block; 12. Return spring. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings and implementation modes.

[0023] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 The circular tube internal expansion mechanism includes: a cylinder body 1, a pipe body 2, a support frame 3, a fixed plate 4, an expansion platform 5 and a push rod 6. The pipe body 2 is arranged above the cylinder body 1, and the top of the cylinder body 1 is fixedly connected to the support frame 3, the upper surface of the support frame 3 is fixedly connected to the fixing plate 4, and the upper surface of the fixing plate 4 is fixedly connected to the expansion platform 5. The push rod 6 is slidably installed on the inner wall of the cylinder body 1, and the pipe body 2 is sleeved on the surface of the expansion platform 5. The cylinder body 1 is started, and the cylinder body 1 controls the extension of the push rod 6, and the push rod 6 enters the inside of the expansion platform 5 to expand and clamp the inner wall of the pipe body 2, and the support frame 3 is supported, and the fixed plate 4 firmly connects the support frame 3 and the expansion platform 5.

[0024] Embodiment 1:

[0025] In the specific implementation process, Figure 2 As shown, a connecting hole 7 is opened on the top of the support frame 3 and inside the fixing plate 4, and the top rod 6 is slidably connected with the connecting hole 7. During the extension and retraction process of the top rod 6, it will pass through the connecting hole 7, which facilitates the rapid passage of the top rod 6.

[0026] refer to Figure 3 and Figure 4 As shown, the top of the push rod 6 is fixedly connected to an extrusion block 8, and the inner wall of the expansion platform 5 is symmetrically slidably connected to a pressure block 9. The inner wall of the expansion platform 5 is symmetrically provided with four guide grooves 10. During the extension process of the push rod 6, the extrusion block 8 is driven to squeeze the pressure block 9, and the pressure block 9 is moved out of the expansion platform 5. The pressure block 9 contacts the inner wall of the pipe body 2, and the inner wall of the pipe body 2 is expanded and clamped.

[0027] refer to Figure 3 and Figure 4As shown, the surfaces of the two pressure blocks 9 are symmetrically fixedly connected with guide blocks 11, and the guide blocks 11 slide on the inner walls of the guide grooves 10. The surfaces of the two guide blocks 11 are fixedly connected with return springs 12, and the side of the return spring 12 away from the guide blocks 11 is fixedly connected to the inner wall of the guide grooves 10. In the process of the pressure block 9 moving out of the expansion platform 5, the guide block 11 slides along the inner wall of the guide groove 10 to ensure the horizontal movement of the pressure block 9. When the return spring 12 is stretched and the push rod 6 contracts and the extrusion block 8 no longer squeezes the pressure block 9, the return spring 12 returns to its original position and contracts, driving the guide block 11 to return to its original position, and retracting the pressure block 9 into the expansion platform 5.

[0028] refer to Figure 3 and Figure 4 As shown, the two pressure blocks 9 have rounded sides to reduce the friction on the sides of the pressure blocks 9. When the pressure blocks 9 squeeze the inner wall of the pipe body 2, the wear on the inner wall of the pipe body 2 is reduced, thereby improving the practicality of the pressure blocks 9.

[0029] refer to Figure 3 and Figure 4 As shown, the top of the extrusion block 8 and the bottom of the pressure block 9 are designed to be sloped. When the extrusion block 8 squeezes the pressure block 9, the upward pushing force is converted into a uniform expanding force in the vertical directions on both sides.

[0030] Embodiment 2:

[0031] refer to Figure 1 and Figure 2 As shown, the support frame 3 is made of stainless steel material, which has high hardness and tensile strength. During use, the surface of the support frame 3 is squeezed or collided, and will not be easily worn or dented, thereby extending the service life of the support frame 3.

[0032] The above are only embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A circular tube internal expansion mechanism, characterized in that: include: A cylinder body (1), a pipeline body (2), a support frame (3), a fixing plate (4), an expansion platform (5) and a push rod (6); the pipeline body (2) is arranged above the cylinder body (1); the top of the cylinder body (1) is fixedly connected to the support frame (3); the upper surface of the support frame (3) is fixedly connected to the fixing plate (4); the upper surface of the fixing plate (4) is fixedly connected to the expansion platform (5); and the inner wall of the cylinder body (1) is slidably mounted with a push rod (6); The top of the push rod (6) is fixedly connected to an extrusion block (8), the inner wall of the expansion platform (5) is symmetrically slidably connected to a pressure block (9), and the inner wall of the expansion platform (5) is symmetrically provided with four guide grooves (10).

2. The circular tube internal expansion mechanism according to claim 1, characterized in that: A communication hole (7) is provided on the top of the support frame (3) and inside the fixing plate (4), and the top rod (6) is slidably connected with the communication hole (7).

3. The circular tube internal expansion mechanism according to claim 1, characterized in that: The surfaces of the two pressure blocks (9) are symmetrically fixedly connected with guide blocks (11), and the guide blocks (11) slide on the inner wall of the guide groove (10). The surfaces of the two guide blocks (11) are fixedly connected with return springs (12), and the side of the return spring (12) away from the guide blocks (11) is fixedly connected to the inner wall of the guide groove (10).

4. The circular tube internal expansion mechanism according to claim 1, characterized in that: The sides of the two pressure blocks (9) are provided with rounded corners.

5. The circular tube internal expansion mechanism according to claim 1, characterized in that: The top of the extrusion block (8) and the bottom of the pressure block (9) are designed in a sloped manner.

6. The circular tube internal expansion mechanism according to claim 1, characterized in that: The support frame (3) is made of stainless steel.

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