Rotary pipe ring expanding device

Abstract

The utility model discloses a rotary pipe ring expanding device which comprises a support, a lifting mechanism and a rotary expanding mechanism, the rotary expanding mechanism is connected with the support in a detachable mode, the lifting mechanism is installed on the support, one side of the rotary expanding mechanism is connected with the lifting mechanism, and when the rotary expanding mechanism is connected with the support in a contact mode, the lifting mechanism is installed on the support. The rotary expanding mechanism can be separated from the support through the lifting mechanism. The device is simple in structure and convenient to use, can realize comprehensive expansion of the pipe ring only by using a short pipe ring, avoids waste of the aluminum-plastic composite pipe, and is accurate and reliable in detection result.

Description

Technical Field

[0001] The utility model relates to the technical field of aluminum-plastic composite pipe detection, in particular to a rotary pipe ring diameter expanding device. Background Art

[0002] The basic structure of an aluminum-plastic composite pipe typically consists of five layers: an outer plastic layer, a hot-melt adhesive layer, an aluminum foil layer, a hot-melt adhesive layer, and an outer plastic layer. The aluminum foil layer is welded together, and the quality of the welding and the adhesion between the foil and the inner and outer plastic layers determine the quality of the pipe. Therefore, quality testing of aluminum-plastic composite pipes is necessary, and one method of testing is to determine whether the pipe will crack when expanded.

[0003] At present, the commonly used aluminum-plastic composite pipe expansion device is an expansion punch with a cone-shaped expansion head to expand the pipe inside. This device is not suitable for shorter pipe rings and requires a longer pipe length to be reserved. In addition, it only expands one end face of the aluminum-plastic composite pipe, which not only causes waste of pipes, but also because it can only expand one end face of the aluminum-plastic composite pipe, the detection results are not very accurate and reliable. Summary of the Invention

[0004] In order to solve the problems existing in the above-mentioned prior art, the utility model provides a rotary pipe ring diameter expansion device, which has a simple structure and is easy to use. Only a relatively short pipe ring is required to achieve full expansion of the pipe ring, which not only avoids the waste of aluminum-plastic composite pipes, but also ensures accurate and reliable detection results.

[0005] The technical solutions adopted to achieve the above-mentioned purpose of the utility model are:

[0006] A rotary pipe ring diameter expanding device includes a bracket, a lifting mechanism and a rotary diameter expanding mechanism. The rotary diameter expanding mechanism is connected to the bracket in a detachable manner. The lifting mechanism is installed on the bracket. One side of the rotary diameter expanding mechanism is connected to the lifting mechanism. When the rotary diameter expanding mechanism and the bracket are in contact connection, the rotary diameter expanding mechanism can be separated from the bracket by the lifting mechanism.

[0007] The rotary expansion mechanism includes a driving mechanism and a connecting rod expansion assembly. The connecting rod expansion assembly includes at least two expansion plates and at least two connecting rod mechanisms. The expansion plates are arc-shaped. When the two or more expansion plates are in an unexpanded state, the two or more expansion plates are combined to form a tubular structure. The two or more connecting rod mechanisms are distributed along the axial direction of the tubular structure. The two ends of each connecting rod mechanism are respectively connected to the driving mechanism and each expansion plate. The expansion plate can expand outward along the radial direction of the tubular structure while rotating.

[0008] The connecting rod mechanism includes a connecting ring and multiple connecting rods. The number of connecting rods is the same as the number of expansion plates. The multiple connecting rods are evenly distributed along the circumference of the connecting ring. One end of each connecting rod is hinged to the outer wall of the connecting ring, and the other end of each connecting rod is hinged to the corresponding inner wall of the expansion plate. Each connecting rod can rotate in the plane where the connecting ring axial section is located.

[0009] The connecting rod includes a pair of push-pull rods, the outer wall of the connecting ring is provided with first hinge ears evenly distributed along its circumference, the inner wall of the expansion plate is provided with convex ribs extending along its length, one end of the pair of push-pull rods is hinged to the first hinge ears through a hinge shaft, and the other end of the pair of push-pull rods is hinged to the corresponding convex ribs on the expansion plate through the hinge shaft.

[0010] Among the two or more connecting rod mechanisms distributed along the axial direction of the tubular structure, the two outermost connecting rod mechanisms are respectively located on both sides of the tubular structure.

[0011] The driving mechanism includes a ball screw, a ball nut and two bearings. One end of the ball screw is connected to the lifting mechanism, the ball nut is sleeved on the ball screw, and the two bearings are respectively sleeved on both sides of the ball screw near its two ends. The two bearings are respectively installed on the bracket in a detachable manner. The ball nut is fixedly connected to one end of the connecting rod mechanism closest to it, and one end of each of the remaining connecting rod mechanisms is connected to the ball screw.

[0012] The connecting ring sleeves of each connecting rod mechanism are arranged on the ball screw, and the connecting ring sleeves of each connecting rod mechanism are loosely matched with the ball screw. One end face of the ball nut and one end of the connecting ring on the connecting rod mechanism closest to it are fitted and fixedly connected, and the connecting rings on the remaining connecting rod mechanisms are fixed to the ball screw by screws.

[0013] The bracket includes a base and two T-shaped support columns, the lower ends of the two support columns are fixed on the base, the two support columns are opposite to each other, and the tops of the two support columns are symmetrically provided with placement grooves that cooperate with the ball screw. The placement grooves are semicircular, and the two placement grooves are symmetrically provided with clamping grooves. The clamping grooves are semicircular. The two sides of the ball screw are placed on the two placement grooves near its two ends, and the two bearings are respectively engaged in the two clamping grooves.

[0014] The other end of the ball screw is connected with a triangular handle.

[0015] The lifting mechanism includes a column and a ball joint, the ball joint includes a universal ball head and a universal joint seat, the universal ball head is installed in the universal joint seat, the lower end of the vertical rod is fixed to the bracket, the top of the vertical rod is provided with a hinge groove, and the universal joint seat is provided with a second hinge ear. The universal joint seat is rotatably connected to the hinge groove through the second hinge ear and the hinge pin, and one end of the ball screw is fixedly connected to the universal ball head.

[0016] Compared with the prior art, the beneficial effects and advantages of the present invention are:

[0017] 1. This device utilizes the principles of screw transmission and connecting rod mechanisms, combining a screw and multiple connecting rod mechanisms to form a rotating diameter expansion mechanism. On the one hand, the multiple connecting rod mechanisms rotate with the screw, and on the other hand, the multiple connecting rod mechanisms are pushed outward by the movement of the screw nut. The multiple connecting rod mechanisms push the expansion plate to expand the pipe ring, achieving the purpose of diameter expansion and detecting whether the pipe ring meets the standard expansion requirements (whether it is cracked). Therefore, the device only requires a relatively short pipe ring to achieve full expansion of the pipe ring, not only avoiding waste of pipe material, but also providing accurate and reliable test results.

[0018] 2. The device is equipped with a lifting mechanism, which makes it easy to place the pipe ring to be tested on the rotating diameter expansion mechanism, and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the rotary pipe ring expansion device (lifted state).

[0020] Figure 2 This is a working diagram of the rotary pipe ring expansion device (to be expanded).

[0021] Figure 3 This is a working diagram of the rotary pipe ring expansion device (expansion completed).

[0022] Figure 4 It is a structural diagram of the rotary expansion mechanism.

[0023] Among them, 1-base, 2-support column, 3-placement slot, 4-card slot, 5-column, 6-universal ball head, 7-hinge slot, 8-second hinge ear, 9-ball screw, 10-ball nut, 11-bearing, 12-triangular handle, 13-expansion plate, 14-connecting ring, 15-first hinge ear, 16-convex rib, 17-push-pull rod, 18-universal joint seat, 19-pipe ring. DETAILED DESCRIPTION

[0024] The present invention will be described in detail below with reference to the accompanying drawings.

[0025] The structure of the rotary pipe ring diameter expanding device provided in this embodiment is as follows Figure 1-3 As shown, it includes a bracket, a lifting mechanism and a rotary diameter expansion mechanism, and the rotary diameter expansion mechanism includes a driving mechanism and a connecting rod diameter expansion assembly.

[0026] The bracket comprises a base 1 and two T-shaped support columns 2. The two columns 2 face each other, with their lower ends fixed to the center of the base 1. The straight line extending between the two columns 2 is parallel to the length of the base 1. Semicircular placement slots 3 are symmetrically defined on the tops of the two columns 2. Semicircular locking slots 4 are symmetrically defined within the two placement slots 3.

[0027] The lifting mechanism comprises an upright post 5 and a universal joint. The universal joint comprises a universal ball 6 and a universal joint seat 18. The universal joint seat 18 is cylindrical, with the universal ball 6 mounted on one end of the universal joint seat 18. The lower end of the upright post 5 is fixed to the base 1, with the upright post 5 and the two support posts 2 aligned in a straight line. A hinge slot 7 is provided at the top of the upright post 5, and a second hinge lug 8 is provided on the other end of the universal joint seat 18. The universal joint seat 18 is pivotally connected to the hinge slot 7 via the second hinge lug 8 and a hinge pin.

[0028] The driving mechanism includes a ball screw 9, a ball nut 10 and two bearings 11. The ball nut 10 is sleeved on the ball screw 9, and the ball nut 10 is close to the bearing 11 that is relatively close to the triangular handle 12. The two bearings 11 are respectively sleeved on both sides of the ball screw 9 near its two ends, and the two bearings 11 are respectively engaged in the two slots 4. A triangular handle 12 is connected to one end of the ball screw 9. Operating the ball screw 9 through the triangular handle 12 is not only convenient but also more labor-saving. The other end of the ball screw 9 is fixedly connected to the universal ball head 6, such as a threaded connection or a bolt connection. Since the two bearings 11 are respectively engaged with the two support columns 2, and since the other end of the ball screw 9 is connected to the universal ball head 6, and the universal joint seat 18 is hinged to the column 5, the ball screw 9 can be lifted by operating the triangular handle 12, and the other side of the ball screw 9 can be moved back and forth.

[0029] The connecting rod expansion assembly includes three expansion plates 13 and three connecting mechanisms. The expansion plates 13 are arc-shaped. When the three expansion plates 13 are in the unexpanded state, the three expansion plates 13 enclose a tubular structure. The ball screw 9 runs through the center of the tubular structure and is coaxial with the tubular structure. The three connecting mechanisms are distributed in sequence along the axial direction of the tubular structure. The two connecting rod mechanisms on the outside are located on both sides of the tubular structure, and the two connecting rod mechanisms are respectively close to the two ends of the tubular structure. The other connecting rod mechanism is close to the connecting mechanism on the outside, which is closer to the triangular handle 12.

[0030] The linkage mechanism comprises a connecting ring 14 and three connecting rods, each comprising a pair of push-pull rods 17. The outer wall of the connecting ring 14 is provided with evenly distributed first hinge lugs 15 along its circumference, and the inner wall of the expansion plate 13 is provided with ribs 16 extending along its length. One end of each connecting rod's pair of push-pull rods 17 is hinged to the corresponding first hinge lug 15 via a hinge axis, while the other end of each connecting rod's pair of push-pull rods 17 is hinged to the corresponding rib 16 on the expansion plate 13 via a hinge axis. Each connecting rod is rotatable within the plane of the connecting ring 14's axial cross-section.

[0031] The connecting ring 14 of each connecting rod mechanism is sleeved on the ball screw 9, and the connecting ring 14 of each connecting rod mechanism is loosely fitted with the ball screw 9. One end face of the ball nut 10 is in contact with and fixedly connected to one end of the connecting ring 14 on the connecting rod mechanism closest to it, and the connecting rings 14 on the remaining connecting rod mechanisms are fixed to the ball screw 9 by screws.

[0032] When it is necessary to carry out expansion test on the pipe ring of aluminum-plastic composite pipe, such as Figure 1 As shown, first use the triangular handle 12 to lift the rotary expansion mechanism, and put the pipe ring 19 on the tubular structure formed by the three expansion plates 13. Then operate the triangular handle 12 to restore the rotary expansion mechanism. At this time, the two bearings 11 are engaged with the two grooves 4. The ball screw 9 is fixed to the bracket through the engagement of the bearings 11 and the grooves 4. Figure 2 As shown. For ease of description, the connecting rod mechanisms distributed axially along the ball screw 9 are named connecting rod mechanism A, connecting rod mechanism B, and connecting rod mechanism C, respectively. The connecting rod mechanism connected to the ball nut 10 is connecting rod mechanism A. Turning the triangular handle 12 drives the ball screw 9 to rotate, and the ball nut 10 rotates while moving toward the lifting mechanism. The ball nut 10 drives the connecting ring A to move, and the connecting ring A drives the three connecting rods A to rotate during this movement. The three connecting rods A push the three expansion plates to expand outward. The outward expansion of the three expansion plates 13 drives the rotation of connecting rods B and connecting rod C. The rotation of connecting rods B and connecting rod C simultaneously pushes the three expansion plates 13 to expand outward. As the three expansion plates 13 expand outward, the diameter of the pipe ring is expanded.

Claims

1. A rotary pipe ring expansion device, characterized in that: The utility model comprises a bracket, a lifting mechanism and a rotary diameter expanding mechanism, wherein the rotary diameter expanding mechanism is detachably connected to the bracket, the lifting mechanism is mounted on the bracket, and one side of the rotary diameter expanding mechanism is connected to the lifting mechanism. When the rotary diameter expanding mechanism and the bracket are in contact connection, the rotary diameter expanding mechanism can be separated from the bracket by the lifting mechanism. The rotary expansion mechanism includes a drive mechanism and a connecting rod expansion assembly. The connecting rod expansion assembly includes at least two expansion plates and at least two connecting rod mechanisms. The expansion plates are arc-shaped. When the two or more expansion plates are in an unexpanded state, the two or more expansion plates enclose a tubular structure. The two or more connecting rod mechanisms are distributed along the axial direction of the tubular structure. The two ends of each connecting rod mechanism are respectively connected to the drive mechanism and each expansion plate. The expansion plates can expand outward along the radial direction of the tubular structure while rotating. The driving mechanism includes a ball screw, a ball nut and two bearings. The ball screw passes through the tubular structure and is coaxial with the tubular structure. One end of the ball screw is connected to the lifting mechanism. The ball nut is sleeved on the ball screw. The two bearings are respectively sleeved on both sides of the ball screw near its two ends. The two bearings are respectively mounted on the bracket in a detachable manner. The ball nut is fixedly connected to one end of the connecting rod mechanism closest to it, and one end of each of the remaining connecting rod mechanisms is connected to the ball screw.

2. The rotary pipe ring diameter expanding device according to claim 1, characterized in that: The connecting rod mechanism includes a connecting ring and multiple connecting rods. The number of connecting rods is the same as the number of expansion plates. The multiple connecting rods are evenly distributed along the circumference of the connecting ring. One end of each connecting rod is hinged to the outer wall of the connecting ring, and the other end of each connecting rod is hinged to the corresponding inner wall of the expansion plate. Each connecting rod can rotate in the plane where the connecting ring axial section is located.

3. The rotary pipe ring diameter expanding device according to claim 1, characterized in that: The connecting rod includes a pair of push-pull rods, the outer wall of the connecting ring is provided with first hinge ears evenly distributed along its circumference, the inner wall of the expansion plate is provided with convex ribs extending along its length, one end of the pair of push-pull rods is hinged to the first hinge ears through a hinge shaft, and the other end of the pair of push-pull rods is hinged to the corresponding convex ribs on the expansion plate through the hinge shaft.

4. The rotary pipe ring diameter expanding device according to claim 2, characterized in that: Among the two or more connecting rod mechanisms distributed along the axial direction of the tubular structure, the two outermost connecting rod mechanisms are respectively located on both sides of the tubular structure.

5. The rotary pipe ring diameter expanding device according to claim 1, characterized in that: The connecting ring sleeves of each connecting rod mechanism are arranged on the ball screw, and the connecting ring sleeves of each connecting rod mechanism are loosely matched with the ball screw. One end face of the ball nut and one end of the connecting ring on the connecting rod mechanism closest to it are fitted and fixedly connected, and the connecting rings on the remaining connecting rod mechanisms are fixed to the ball screw by screws.

6. The rotary pipe ring diameter expanding device according to claim 1, characterized in that: The bracket includes a base and two T-shaped support columns, the lower ends of the two support columns are fixed on the base, the two support columns are opposite to each other, and the tops of the two support columns are symmetrically provided with placement grooves that cooperate with the ball screw. The placement grooves are semicircular, and the two placement grooves are symmetrically provided with clamping grooves. The clamping grooves are semicircular. The two sides of the ball screw are placed on the two placement grooves near its two ends, and the two bearings are respectively engaged in the two clamping grooves.

7. The rotary pipe ring diameter expanding device according to claim 1, characterized in that: The other end of the ball screw is connected with a triangular handle.

8. The rotary pipe ring diameter expanding device according to claim 1, characterized in that: The lifting mechanism includes a column and a ball joint, the ball joint includes a universal ball head and a universal joint seat, the universal ball head is installed in the universal joint seat, the lower end of the vertical rod is fixed to the bracket, the top of the vertical rod is provided with a hinge groove, and the universal joint seat is provided with a second hinge ear. The universal joint seat is rotatably connected to the hinge groove through the second hinge ear and the hinge pin, and one end of the ball screw is fixedly connected to the universal ball head.

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