Pipe radial compression device

Abstract

The utility model relates to the technical field of tool clamps, in particular to a pipe radial compression device which comprises a bottom plate and a gland, the bottom plate is provided with a center table, and at least three push plates are evenly distributed on the bottom plate around the center table by a circle. The push plate is a wedge-shaped block formed by rotating a big-end-down right trapezoid around the center of the center table by a certain angle, the push plate can move in the radial direction of the center table, a spring for pushing the push plate outwards is arranged between the push plate and the center table, a limiting ring is arranged at the bottom of the outer side of the push plate in a sleeving mode, the gland is provided with a pressing ring, and the pressing ring is connected with the push plate in a sleeving mode. The inner side of the pressing ring is a circular truncated cone face, and the generatrix dip angle of the inner side face of the pressing ring is equal to the generatrix dip angle of the outer side face of the push plate. The inner side face of the pressing ring which is pressed downwards is matched with the outer side face of the push plate, and the two faces are inclined faces, so that the push plate is pushed to contract inwards, a workpiece placed on the center table is compressed in the radial direction, and operation is easy and fast.

Description

TECHNICAL FIELD

[0001] The utility model relates to tool fixture technical field, in particular to a pipe radial compression device. BACKGROUND

[0002] It is often needed to reduce the diameter of pipe in production in order to facilitate installation or eliminate stress, such as shock-absorbing shaft, after injecting vulcanized silica gel between the inner and outer coaxial steel pipes, the silica gel will be adhered together with the inner and outer steel pipes, when the silica gel cools and shrinks, the shrinkage stress will be generated in the silica gel, if the stress is not eliminated, the shock-absorbing effect of silica gel will be reduced, and even the silica gel will be torn to cause product scrap. Therefore, the outer pipe needs to be radially compressed after the silica gel injection is completed in production, so as to reduce the spacing between the outer pipe and the inner pipe, and then avoid the stress generated by silica gel cooling. SUMMARY

[0003] The utility model discloses a pipe radial compression device, which converts the downward pressure into horizontal thrust by using the wedge-shaped structure, so as to radially compress the workpiece placed between the plurality of wedge-shaped structures, and has the advantages of simple structure and convenient operation.

[0004] The utility model discloses a pipe radial compression device, which converts the downward pressure into horizontal thrust by using the wedge-shaped structure, so as to radially compress the workpiece placed between the plurality of wedge-shaped structures, and has the advantages of simple structure and convenient operation.

[0005] Preferably, the center table is a regular polygon prism, and the number of the push plates is equal to the number of the outer side surfaces of the center table.

[0006] Preferably, the center table is a regular dodecahedron.

[0007] Preferably, the center table is a regular dodecahedron.

[0008] Preferably, the center table and the push plates are both provided with grooves for clamping the springs.

[0009] Preferably, the center platform is provided with a guide rod, the push plate is provided with a hole that can cover the guide rod, and the spring is sleeved on the guide rod and abuts against the center platform and the push plate at both ends.

[0010] Preferably, the bottom plate is provided with a positioning pin that limits the movement of the limiting ring.

[0011] Preferably, the pressing plate is provided with a through hole coaxial with the pressing ring, and the diameter of the through hole is equal to the small diameter of the inner top end of the pressing ring.

[0012] Preferably, the top of the limiting ring is provided with a limiting ring that limits the downward pressing distance of the pressing ring.

[0013] Preferably, the inner bottom end of the pressing ring has a larger diameter than the minimum contraction of the push plate.

[0014] The beneficial effects of the utility model are as follows: a pipe radial compression device, which comprises a bottom plate and a pressing cover, a center platform is arranged in the middle of the bottom plate, at least three push plates are uniformly distributed in a circle around the center platform, the push plate is a trapezoidal block formed by rotating a right-angled trapezoid around the center of the center platform by a certain angle, the inner side of the push plate is a vertical surface, the height of the push plate is greater than that of the center platform, the push plate can move radially along the center platform, a spring is arranged between the bottom of the push plate and the center platform to push the push plate outward, a limiting ring is arranged on the outer bottom of the push plate to prevent the push plate from being bounced, the pressing cover comprises a pressing plate and a pressing ring that can be simultaneously sleeved on the outer sides of all push plates, the inner side of the pressing ring is a circular platform, and the inner side of the pressing ring has a same inclination angle as the outer side of the push plate. The inner side of the pressing ring matches the outer side of the push plate, and because the two surfaces are inclined, the push plate is pushed inward to radially compress the workpiece placed on the center platform, so that the operation is simple and fast. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a three-dimensional structure diagram of a pipe radial compression device of the utility model;

[0016] Figure 2 is a main sectional view of a pipe radial compression device of the utility model.

[0017] MARKING OF THE DRAWINGS:

[0018] 1 - bottom plate, 2 - center platform, 3 - push plate, 4 - spring, 5 - limiting ring, 6 - pressing cover, 61 - pressing plate, 62 - pressing ring, 7 - positioning pin, 8 - limiting ring. DETAILED DESCRIPTION

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the present invention.

[0020] like Figure 1 , 2 As shown, this embodiment of a radial compression device for pipes includes a base plate 1 and a pressure cap 6. A central platform 2 is disposed in the center of the base plate 1. The central platform 2 is a regular dodecagonal prism. Twelve push plates 3 are evenly distributed in a circle around the central platform 2 on the base plate 1. Each push plate 3 is a wedge-shaped block formed by rotating a right-angled trapezoid (smaller at the top and larger at the bottom) around the center of the central platform 1 at a certain angle. The inner surface of each push plate 3 is a vertical surface. The height of each push plate 3 is greater than that of the central platform 2. Each push plate 3 can move radially along the central platform 2. A spring 4 is provided between the bottom of the push plate 3 and the center platform 2 to push the push plate 3 outward. A limiting ring 5 is fitted on the bottom outer side of the push plate 3 to prevent the push plate 3 from being bounced away. The pressure cover 6 includes a pressure plate 61 and a pressure ring 62 that can be fitted on the outer side of all push plates 3 at the same time. The inner side of the pressure ring 62 is a frustum. The large diameter of the bottom inner side of the pressure ring 62 is larger than the outer diameter of the top of the push plate 3 when it is fully open, and smaller than the outer diameter of the bottom of the push plate 3 when it is minimally contracted. The generatrix inclination angle of the inner side of the pressure ring 62 is equal to the generatrix inclination angle of the outer side of the push plate 3.

[0021] During operation, the workpiece to be compressed is placed on the central platform 2, and then the pressure ring 62 is fitted onto the push plate 3 from above. When downward pressure is applied to the pressure cover 6, the pressure ring 62 pushes the push plate 3 to move radially through the inclined surface that engages with the push plate 3, thereby pushing all the push plates 3 to contract towards the center, thus radially compressing the workpiece at the center.

[0022] To prevent the spring 4 from falling off, both the center platform 2 and the push plate 3 are provided with grooves to secure the spring 4.

[0023] The base plate 1 is provided with a positioning pin 7 to restrict the movement of the limiting ring 5; in addition, in order to facilitate different degrees of shrinkage for workpieces of different diameters, the top of the limiting ring 5 is provided with a limiting ring 8 to position the pressing distance of the pressure ring 62. The limiting ring 8 can be prepared in many different thickness models for easy replacement.

[0024] To facilitate observation of the workpiece compression or to facilitate local compression of excessively long workpieces, the pressure plate 61 is provided with a through hole coaxial with the pressure ring 62, and the diameter of the through hole is equal to the minor diameter of the inner top end of the pressure ring 62.

[0025] Finally, it should be noted that the above examples are used to illustrate the technical solutions of the present application, and for the convenience of describing the technical solutions, the directions of front, back, left, right, up, middle and down are set based on the drawings, and are not a limitation on the protection scope of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the essence and scope of the technical solutions of the present application.

Claims

1. A pipe radial compression device, characterized by: The device comprises a base plate and a pressing cover. A center platform is arranged in the middle of the base plate. At least three push plates are evenly distributed around the center platform in a circular shape. The push plates are trapezoidal blocks with a small top and a large bottom, which are rotated around the center of the center platform by a certain angle. The inner side of the push plate is a vertical surface. The height of the push plate is greater than that of the center platform. The push plate can move along the radial direction of the center platform. A spring is arranged between the bottom of the push plate and the center platform to push the push plate outward. A limiting ring is arranged on the outer side of the push plate to prevent the push plate from being bounced away. The pressing cover comprises a pressing plate and a pressing ring which can be simultaneously fitted on the outer side of all push plates. The inner side of the pressing ring is a circular platform. The inner side bottom end of the pressing ring has a larger diameter than the outer diameter of the top of the push plate when it is fully opened. The inner side of the pressing ring has a same angle as the outer side of the push plate.

2. A pipe radial compression device according to claim 1, characterized in that: The center platform is a regular polygonal prism. The number of push plates is equal to the number of outer sides of the center platform.

3. A pipe radial compression device according to claim 1, characterized in that: The center platform is a regular dodecahedron.

4. A pipe radial compression device according to claim 1, characterized in that: The center platform is circular.

5. A pipe radial compression device according to claim 1, wherein: The center platform and the push plate are both provided with a groove for clamping the spring.

6. A pipe radial compression device according to claim 1, characterized in that: The center platform is provided with a guide rod. The push plate is provided with a hole which can be fitted on the guide rod. The spring is fitted on the guide rod and contacts the center platform and the push plate at both ends.

7. A pipe radial compression device according to claim 1, wherein: The base plate is provided with a positioning pin for limiting the movement of the limiting ring.

8. A pipe radial compression device according to claim 1, characterized in that: The pressing plate is provided with a through hole which is coaxial with the pressing ring. The diameter of the through hole is equal to the small diameter of the top end of the inner side of the pressing ring.

9. A pipe radial compression device according to claim 1, wherein: The top of the limiting ring is provided with a limiting ring for positioning the pressing ring.

10. A pipe radial compression device according to claim 1, characterized in that: The inner side bottom end of the pressing ring has a smaller diameter than the outer diameter of the bottom of the push plate when it is fully closed.

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