Variable outer diameter centering fixture

Abstract

This utility model discloses a variable outer diameter centering fixture, including a bracket, an active ring, a ring drive mechanism, and two or more grippers. The active ring is movably mounted on the bracket, and the ring drive mechanism is fixedly mounted on the bracket and can drive the active ring to rotate. The two or more grippers are evenly distributed along the circumference of the active ring, each gripper is hinged to the bracket, and each gripper is movably connected to the active ring. The gripping portions of the two or more grippers are distributed on the same circumference, the center of which is located on the axis of the active ring, and the gripping portions of the two or more grippers can simultaneously move closer to or further away from each other. This fixture can center and clamp PPR plastic-aluminum stabilized tubes of different sizes and specifications, facilitating subsequent rolling operations. It not only saves centering time and improves centering efficiency but also reduces rolling waste caused by inaccurate centering, thus lowering production costs.

Description

Technical Field

[0001] This utility model relates to the field of plastic-aluminum stable tube production technology, specifically to a variable outer diameter centering clamp. Background Technology

[0002] Currently, after the PPR (Polypropylene Plastic-Aluminum) stabilized tubing (perforated stabilized tubing) comes off the production line, the outer layer (PPB layer) and the middle layer (perforated aluminum tube layer) undergo centering and rolling. There is no dedicated centering fixture for this process, and the stabilized tubing comes in various sizes. The worktable can only center one size of stabilized tubing to align it with the center of the rolling pin on the machine. When changing to a different size, the tubing must be manually lifted and centered to ensure its center is at the same height as the rolling pin. Since the stabilized tubing is typically 4 meters long, this method is not only labor-intensive but also cumbersome and time-consuming, especially when rolling large-diameter stabilized tubing.

[0003] In addition, this method of centering by hand is very prone to inaccurate centering. When the centering is inaccurate, the rolling may not be clean, and some aluminum layers may not be rolled clean, resulting in the failure of rolling the PVC-Aluminum Steady-state tube. This reduces the quality of the PVC-Aluminum Steady-state tube and increases the scrap rate and production costs. Summary of the Invention

[0004] To address the problems existing in the prior art, this utility model provides a variable outer diameter centering fixture. This fixture can center and clamp PPR plastic-aluminum stabilized tubes of different sizes and specifications, facilitating subsequent rolling operations. It not only saves centering time and improves centering efficiency, but also reduces rolling waste caused by inaccurate centering, thereby lowering production costs.

[0005] The technical solution adopted to achieve the above-mentioned objectives of this utility model is as follows:

[0006] A variable outer diameter centering fixture includes a support, an active ring, a ring drive mechanism, and two or more grippers. The active ring is movably mounted on the support, and the ring drive mechanism is fixedly mounted on the support. The ring drive mechanism can drive the active ring to rotate. The two or more grippers are evenly distributed along the circumference of the active ring. Each gripper is hinged to the support and movably connected to the active ring. The gripping portions of the two or more grippers are distributed on the same circumference, the center of which is located on the axis of the active ring, and the gripping portions of the two or more grippers can simultaneously move closer to or further away from each other.

[0007] The bracket is provided with a guide groove, which is arc-shaped, and the center of the arc is located on the axis of the active ring.

[0008] The active ring is provided with two or more evenly distributed connecting bolts along its circumference. The tail of each connecting bolt is threaded to the active ring, each connecting bolt passes through the guide groove, and the head of each connecting bolt abuts against the side of the bracket facing away from the active ring. Each connecting bolt can slide along the guide groove.

[0009] The guide groove is in the shape of an arc.

[0010] The circular drive mechanism includes a screw, a nut seat, and a bearing seat. The bearing seat is fixed on the bracket, the screw passes through the bearing seat and is rotatably connected to the bearing seat, the nut seat is sleeved on the screw, and the screw and the nut seat form a lead screw structure through threads. The nut seat is fixedly connected to the driving circular ring.

[0011] One end of the screw is provided with a heptagonal head, and the bearing seat is located between the heptagonal head and the nut seat.

[0012] The gripper includes a connecting rod and a slider. The slider has a hollow structure and is fixedly mounted on the active ring. The connecting rod is parallel to the active ring, and one end of the connecting rod is rotatably connected to the bracket. The connecting rod passes through the slider and is slidably connected to the slider.

[0013] It also includes a driven ring parallel to the active ring. The driven ring is located on the side of the active ring facing away from the support. There are multiple circumferentially distributed support rods between the driven ring and the active ring. One end of each support rod is connected to the active ring, and the other end of each support rod is connected to the driven ring. Each connecting rod is located between the active ring and the driven ring, and each slider is fixed on the end face of the driven ring facing the active ring.

[0014] The other end of the connecting rod is provided with a centering guide wheel.

[0015] The gripper has three links, which are distributed on the straight line containing the three sides of the same equilateral triangle, and the center of the circumcircle of the equilateral triangle is located on the axis of the active ring.

[0016] The bracket is L-shaped and includes a supporting vertical plate and a horizontal ear plate. The bottom of the supporting vertical plate is connected to one side edge of the horizontal ear plate, and the horizontal ear plate has a through hole.

[0017] Compared with the prior art, the beneficial effects and advantages of this utility model are as follows:

[0018] 1. This clamp drives the active disc to rotate via a lead screw. The active disc drives the connecting rod to move simultaneously in the axial and radial directions via a driven ring. This allows the centering guide wheels of the three jaws to move closer or further apart at the same time. The centering guide wheels of the three jaws can clamp PPR plastic-aluminum stabilized tubes with an outer diameter range of 5-140mm, thereby realizing the rapid clamping and centering of plastic-aluminum stabilized tubes of different sizes and specifications. It has a wide range of applications and strong practicality.

[0019] 2. This fixture can quickly center the plastic-aluminum stabilized tube, greatly saving centering time and improving work efficiency. Moreover, the accurate centering makes the rolling process more precise, and the outer and middle layers are rolled more cleanly. It avoids unnecessary scrap caused by rolling failure due to inaccurate centering, greatly reducing the scrap rate and production costs. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a variable outer diameter centering fixture.

[0021] Figure 2 for Figure 1 The main view.

[0022] Figure 3 for Figure 1 Rear view.

[0023] Figure 4 This is a schematic diagram illustrating the use of a variable outer diameter centering fixture.

[0024] Among them, 1-active ring, 2-driven ring, 3-supporting vertical plate, 4-horizontal ear plate, 5-through hole, 6-guide groove, 7-connecting bolt, 8-screw, 9-nut seat, 10-bearing seat, 11-heptagonal head, 12-supporting short rod, 13-connecting rod, 14-slider, 15-centering guide wheel, 16-worktable, 17-PPR plastic-aluminum stable tube, 18-coiling machine, 19-connecting seat. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the accompanying drawings.

[0026] The structure of the variable outer diameter centering fixture provided in this embodiment is as follows: Figure 1-3 As shown, it includes a support, an active ring 1, a driven ring 2, a ring drive mechanism, and three grippers.

[0027] The support frame is L-shaped and includes a vertical support plate 3 and a horizontal lug plate 4. The bottom of the vertical support plate 3 is connected to one side edge of the horizontal lug plate 4. The upper part of the vertical support plate 3 is in the shape of a large arc, and the lower part is in the shape of an isosceles trapezoid. The edge containing the upper chord of the vertical support plate 3 is connected to the edge containing the upper base of the lower part of the vertical support plate 3, and the lengths of the edge containing the upper chord of the vertical support plate 3 and the edge containing the upper base of the lower part of the vertical support plate 3 are equal. The horizontal lug plate 4 has two evenly distributed through holes 5, and the horizontal lug plate 4 is fixed to the worktable 16 by two screws.

[0028] The upper part of the supporting vertical plate 3 is provided with a guide groove 6. The guide groove 6 is in the shape of an arc, and the center of the arc where the guide groove 6 is located is the same as the center of the arc where the upper part of the supporting vertical plate 3 is located.

[0029] The active ring 1 is located on the upper inner side of the supporting vertical plate 3, parallel to the supporting vertical plate 3, and the center of the superior arc of the guide groove 6 is located on the axis of the active ring 1. Three evenly distributed connecting bolts 7 are provided on the active ring 1 along its circumference. The tail of each connecting bolt 7 is threaded to the active ring 1, and each connecting bolt 7 passes through the guide groove 6. The head of each connecting bolt 7 abuts against the outer surface of the supporting vertical plate 3 facing away from the active ring 1, and each connecting bolt 7 can slide along the guide groove 6.

[0030] The circular drive mechanism includes a screw 8, a nut seat 9, and a bearing seat 10. The bearing seat 10 is fixed to the inner surface of the top of the supporting vertical plate 3 facing the driving circular ring 1. The screw 8 passes through the bearing seat 10 and is rotatably connected to it. The screw 8 is located directly above the driving circular ring 1. The nut seat 9 is sleeved on the screw 8, and the screw 8 and the nut seat 9 form a lead screw structure through threads. A connecting seat 19 is connected to the outer wall of the driving circular ring 1. The connecting seat 19 is plate-shaped, and the nut seat 9 is fixed to the connecting seat. The connecting seat is located between the nut seat and the supporting vertical plate 3, and the connecting seat does not contact the supporting vertical plate 3.

[0031] One end of the screw 8 is provided with a heptagonal head 11, and the bearing seat 10 is located between the heptagonal head 11 and the nut seat 9. By rotating the screw 8 with a hex wrench, the screw 8 is more easily rotated under the action of the bearing seat 10. Rotating the screw 8 causes the nut seat 9 to move repeatedly in a straight line along the length of the screw 8.

[0032] The driven ring 2 is located on the outer side of the driving ring 1, facing away from the supporting vertical plate 3. The driven ring 2 is parallel to the driving ring 1 and coaxial with the driving ring 1. A plurality of circumferentially distributed supporting short rods 12 are provided between the driven ring 2 and the driving ring 1. One end of each supporting short rod 12 is connected to the driving ring 1, and the other end of each supporting short rod 12 is connected to the driven ring 2.

[0033] There are three grippers, all located between the driving ring 1 and the driven ring 2. The three grippers are distributed along the straight line containing the three sides of the same equilateral triangle, and the center of the circumcircle of the equilateral triangle is located on the axis of the driving ring 1.

[0034] The gripper includes a connecting rod 13 and a slider 14. The connecting rod 13 has a square cross-section, and the slider 14 is a hollow square frame structure. The connecting rod 13 is parallel to the driving ring 1. One end of the connecting rod 13 is rotatably connected to the upper part of the supporting vertical plate 13 facing the inner surface of the driving ring 1, and the other end of the connecting rod 13 is provided with a centering guide wheel 15. The centering guide wheels 15 on the three connecting rods 13 are distributed on the same circle, and the center of the circle is located on the axis of the driving ring 1. One outer wall of the slider 14 is fixed to the end face of the driven ring 2 facing the driving ring 1. The connecting rod 13 passes through the slider 14, and the connecting rod 13 and the slider 14 are slidably connected.

[0035] When rolling and centering PPR aluminum-plastic composite tubes, two centering fixtures are fixed on the worktable 16, such as... Figure 3 As shown, one centering fixture centers one side of the PPR aluminum-plastic composite tube 17, and another centering fixture centers the other side of the PPR aluminum-plastic composite tube 17. During centering, a hex wrench is used to rotate the screw 8. The screw 8 causes the nut seat 9 to move away from or towards the bearing seat 10. When the nut seat 9 moves towards the bearing seat 10, it causes the driving ring 1 to rotate clockwise. The driving ring 1 then causes the driven ring 2 to rotate clockwise. The driven ring 1 causes the slider 14 to rotate clockwise, and the slider 14 causes the connecting rod 13 to rotate counterclockwise. Simultaneously, the connecting rod 13 can slide along the slider 14, and the centering guide wheel 15 on the connecting rod 13 moves towards the axis of the driving ring 1. When the nut seat 9 moves away from the bearing seat 10, the nut seat 9 drives the driving ring 1 to rotate counterclockwise, the driving ring 1 drives the driven ring 2 to rotate counterclockwise, the driven ring 2 drives the slider 14 to rotate counterclockwise, the slider 14 drives the connecting rod 13 to rotate clockwise, and at the same time the connecting rod 13 can slide along the slider 14, and the centering guide wheel 15 on the connecting rod 13 moves towards the axis of the driving ring 1.

[0036] The three grippers move synchronously, and the PPR plastic-aluminum stabilized tube 17 is clamped and centered by the centering guide wheels 15 on the three grippers. Since the centering guide wheels 15 on the three grippers can move closer or further apart at the same time, the PPR plastic-aluminum stabilized tube 17 of different sizes and specifications can be clamped and centered.

Claims

1. A variable outer diameter centering fixture, characterized in that: The device includes a support, an active ring, a ring drive mechanism, and two or more grippers. The active ring is movably mounted on the support, and the ring drive mechanism is fixedly mounted on the support. The ring drive mechanism can drive the active ring to rotate. The two or more grippers are evenly distributed along the circumference of the active ring. Each gripper is hinged to the support and movably connected to the active ring. The gripping portions of the two or more grippers are distributed on the same circumference, and the center of the circumference is located on the axis of the active ring. The gripping portions of the two or more grippers can simultaneously move closer to or further away from each other.

2. The variable outer diameter centering fixture according to claim 1, characterized in that: The bracket is provided with a guide groove, which is arc-shaped, and the center of the arc is located on the axis of the active ring.

3. The variable outer diameter centering fixture according to claim 2, characterized in that: The active ring is provided with two or more evenly distributed connecting bolts along its circumference. The tail of each connecting bolt is threaded to the active ring, each connecting bolt passes through the guide groove, and the head of each connecting bolt abuts against the side of the bracket facing away from the active ring. Each connecting bolt can slide along the guide groove.

4. The variable outer diameter centering fixture according to claim 2, characterized in that: The guide groove is in the shape of an arc.

5. The variable outer diameter centering fixture according to claim 1, characterized in that: The circular drive mechanism includes a screw, a nut seat, and a bearing seat. The bearing seat is fixed on the bracket, the screw passes through the bearing seat and is rotatably connected to the bearing seat, the nut seat is sleeved on the screw, and the screw and the nut seat form a lead screw structure through threads. The nut seat is fixedly connected to the driving circular ring.

6. The variable outer diameter centering fixture according to claim 5, characterized in that: One end of the screw is provided with a heptagonal head, and the bearing seat is located between the heptagonal head and the nut seat.

7. The variable outer diameter centering fixture according to claim 1, characterized in that: The gripper includes a connecting rod and a slider. The slider has a hollow structure and is fixedly mounted on the active ring. The connecting rod is parallel to the active ring, and one end of the connecting rod is rotatably connected to the bracket. The connecting rod passes through the slider and is slidably connected to the slider.

8. The variable outer diameter centering fixture according to claim 7, characterized in that: It also includes a driven ring parallel to the active ring. The driven ring is located on the side of the active ring facing away from the support. There are multiple circumferentially distributed support rods between the driven ring and the active ring. One end of each support rod is connected to the active ring, and the other end of each support rod is connected to the driven ring. Each connecting rod is located between the active ring and the driven ring, and each slider is fixed on the end face of the driven ring facing the active ring.

9. The variable outer diameter centering fixture according to claim 7, characterized in that: The other end of the connecting rod is provided with a centering guide wheel.

10. The variable outer diameter centering fixture according to claim 7, characterized in that: The gripper has three links, which are distributed on the straight line containing the three sides of the same equilateral triangle, and the center of the circumcircle of the equilateral triangle is located on the axis of the active ring.

11. The variable outer diameter centering fixture according to claim 1, characterized in that: The bracket is L-shaped and includes a supporting vertical plate and a horizontal ear plate. The bottom of the supporting vertical plate is connected to one side edge of the horizontal ear plate, and the horizontal ear plate has a through hole.

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