Pipe fitting clamp fixture

Abstract

The present disclosure relates to a pipe clamp tool, comprising a clamping assembly and a linkage support plate; the clamping assembly is annularly arranged by at least four sets of elastic clamping blocks that are in contact with the pipe; one end of the elastic clamping block is provided with a first rotating shaft, and the other end is provided with a second rotating shaft; the linkage support plate is connected with the clamping assembly through the first rotating shaft, and the second rotating shaft is provided with a through hole that is perpendicular to the axis of the rotating shaft; the clamping action on the pipe is realized through the elastic clamping blocks that are in contact with the pipe and are connected on the annular support plate, and the linkage that is connected with the elastic clamping blocks and is provided with a two-way thread, which ensures that the four sets of elastic clamping blocks can produce synchronous centripetal motion when performing the clamping action, so that the clamping force in the circumferential direction of the pipe is uniformly distributed, avoiding the deformation or damage of the pipe due to uneven force; the four-bar linkage structure composed of the linkage and the elastic clamping block provides stable and controllable clamping force adjustment for different pipe diameters, thereby forming reliable protective clamping on the outer surface of the pipe.

Description

Technical Field

[0001] This disclosure belongs to the technical field of pipe fitting processing equipment, specifically relating to a pipe fitting clamping fixture. Background Technology

[0002] The statements herein provide only background information in relation to this disclosure and do not necessarily constitute prior art.

[0003] In the machining of pipe fittings, the clamping method of the fixture is crucial to machining accuracy, surface quality, and workpiece integrity. Traditional lathe chucks (such as three-jaw or four-jaw chucks) commonly suffer from deformation due to concentrated clamping force when clamping pipe workpieces. For thin-walled or softer pipe fittings, the radially concentrated clamping force applied by the chuck jaws can easily cause indentations on the outer wall, out-of-roundness of the inner cavity, or even permanent plastic deformation. This not only affects the geometric accuracy of the clamped section of the pipe but also makes it difficult to meet requirements for flatness, roundness, concentricity, and wall thickness uniformity of the machined ends during subsequent end-face turning, beveling, and finish turning.

[0004] Existing technologies often use internal support clamps or soft claws for improvement. However, internal support clamps are usually complex in structure, and adjustments are cumbersome when changing to different inner diameter specifications. They cannot evenly distribute the load to prevent pipe deformation. Custom soft claws are expensive and require strict operator skills. For production scenarios that require frequent switching to process pipes of different diameters and materials, they cannot quickly adapt to adjustments for different pipe diameters. Utility Model Content

[0005] The purpose of this disclosure is to provide a pipe fitting clamping fixture that can at least solve one of the above-mentioned technical problems.

[0006] To achieve the above objectives, one or more embodiments of this disclosure provide a pipe fitting clamping fixture, including a clamping assembly and a linkage support plate; the clamping assembly consists of at least four sets of elastic clamping blocks arranged in a ring to fit the pipe fitting; one end of each elastic clamping block is provided with a first rotating shaft, and the other end is provided with a second rotating shaft; the linkage support plate is connected to the clamping assembly through the first rotating shaft, and the second rotating shaft is provided with a through hole perpendicular to the axis of the rotating shaft.

[0007] Furthermore, the elastic clamping block includes a first clamping block, a second clamping block, a third clamping block, and a fourth clamping block. The first clamping block and the second clamping block, as well as the third clamping block and the fourth clamping block, are connected to the first rotating shaft via an arc-shaped connecting plate. The first clamping block and the third clamping block, as well as the second clamping block and the fourth clamping block, are connected via a connecting rod passing through a through hole on the second rotating shaft.

[0008] Furthermore, the through hole of the second rotating shaft is provided with threads, the threads of the first clamping block and the second clamping block are forward threads, and the threads of the third clamping block and the fourth clamping block are reverse threads.

[0009] Furthermore, the connecting rod is provided with a bidirectional thread corresponding to the thread of the second shaft through hole.

[0010] Furthermore, the linkage support plate is a set of symmetrical semi-annular plates, including an upper annular plate and a lower annular plate, and the outer arc of the upper annular plate and the lower annular plate are provided with connection holes for connecting to the processing machine connection seat.

[0011] Furthermore, the connecting hole and the connecting seat are connected by bolts.

[0012] Furthermore, the upper annular plate is connected to the first clamping block and the second clamping block, and the lower annular plate is connected to the third clamping block and the fourth clamping block.

[0013] Furthermore, the end of the first rotating shaft is provided with a thread, the second rotating shaft is a smooth shaft, the first rotating shaft is longer than the second rotating shaft, and a sleeve is provided on the first rotating shaft, the sleeve being disposed between the elastic clamping block and the linkage support plate.

[0014] Furthermore, the elastic clamping block includes an elastic interlayer and metal plates disposed on both sides of the elastic interlayer, and the elastic interlayer and the metal plates have the same shape, both being arc-shaped curved surfaces.

[0015] Furthermore, nuts are provided at both ends of the connecting rod to restrict its position.

[0016] The beneficial effects of one or more of the above technical solutions are as follows:

[0017] This disclosure utilizes a four-bar linkage structure consisting of an elastic clamping block connected to a ring-shaped support plate and fitting to the pipe fitting, and a connecting rod connected to the elastic clamping block and equipped with bidirectional threads. This structure enables the clamping action of the pipe fitting, ensuring that the four sets of elastic clamping blocks can generate synchronous centripetal motion when performing the clamping action. This results in a uniform distribution of the clamping force applied in the circumferential direction of the pipe fitting, effectively avoiding deformation or damage to the pipe fitting caused by uneven force.

[0018] The four-bar linkage structure, consisting of the connecting rod and the elastic clamping block, provides stable and controllable clamping force adjustment for different pipe diameters, thereby forming a reliable protective clamping on the outer surface of the pipe fitting. This ensures the firmness of the clamping while maximizing the protection of the surface smoothness and integrity of the pipe fitting. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation thereof.

[0020] Figure 1 This is a front-view perspective view of the overall structure in one or more embodiments of this disclosure;

[0021] Figure 2 This is a rear-view perspective view of the overall structure in one or more embodiments of this disclosure.

[0022] In the figure, 1 is the first clamping block; 2 is the second clamping block; 3 is the third clamping block; 4 is the fourth clamping block; 5 is the arc-shaped connecting plate; 6 is the first rotating shaft; 7 is the second rotating shaft; 8 is the connecting rod; 9 is the upper annular plate; 10 is the lower annular plate; and 11 is the connecting seat. Detailed Implementation

[0023] like Figures 1-2 As shown, this embodiment provides a pipe fitting clamping fixture, including a clamping assembly and a linkage support plate.

[0024] like Figure 1 As shown, the clamping assembly consists of at least four sets of elastic clamping blocks arranged in a ring to fit the pipe fitting, ensuring a tight fit with the pipe fitting surface to achieve a stable clamping effect; each set of elastic clamping blocks has a first rotating shaft 6 at one end, the end of the first rotating shaft 6 is threaded, and a second rotating shaft 7 at the other end. The second rotating shaft 7 is a smooth shaft, and the first rotating shaft 6 is longer than the second rotating shaft 7. The second rotating shaft 7 has a through hole that is perpendicular to the axis of the second rotating shaft 7.

[0025] Specifically, the clamping assembly is threadedly connected to the linkage support plate via the first rotating shaft 6. A sleeve is provided on the first rotating shaft 6 and is positioned between the elastic clamping block and the linkage support plate to buffer the vibration between the elastic clamping block and the linkage support plate, thereby ensuring the stable operation of the mechanical components and the transmission of force.

[0026] The elastic clamping block includes a first clamping block 1, a second clamping block 2, a third clamping block 3, and a fourth clamping block 4. The first clamping block 1, the second clamping block 2, the third clamping block 3, and the fourth clamping block 4 are connected to the first rotating shaft 6 through an arc-shaped connecting plate 5. The arc-shaped connecting plate 5 allows the elastic clamping blocks to rotate relative to each other within a certain angle range. The first clamping block 1 and the third clamping block 3, as well as the second clamping block 2 and the fourth clamping block 4, are connected by a connecting rod 8 passing through a through hole on the second rotating shaft 7.

[0027] Specifically, the through hole on the second rotating shaft 7 is a threaded hole, the threads of the first clamping block 1 and the second clamping block 2 are forward threads, and the threads of the third clamping block 3 and the fourth clamping block 4 are reverse threads; correspondingly, the connecting rod 8 is machined with bidirectional threads corresponding to these threaded holes. By turning the connecting rod 8, the two sets of elastic clamping blocks can be driven to move in opposite directions or in opposite directions at the same time. As a result, the first clamping block 1 and the third clamping block 3, as well as the second clamping block 2 and the fourth clamping block 4, will generate axial displacements in opposite directions on the connecting rod 8 to achieve synchronous symmetrical clamping or loosening.

[0028] Meanwhile, nuts are usually provided at both ends of the connecting rod 8 to lock it after adjustment, restricting the axial position of the connecting rod 8 and preventing it from rotating accidentally during operation, which would cause the clamping force to be lost. This ensures the stability and reliability of the clamping state and ensures that the four clamping blocks can synchronously and equidistantly retract towards the center or open outward, thereby achieving rapid, concentric, and uniform clamping or release of the pipe fitting. This greatly improves clamping efficiency and positioning accuracy and avoids pipe fitting deformation caused by uneven force at a single point.

[0029] The elastic clamping block comprises an elastic interlayer and metal plates on both sides of the elastic interlayer. Both the elastic interlayer and the metal plates have a consistent arc-shaped curved surface. This gives the elastic clamping block both the rigidity and strength of metal, enabling it to withstand large loads during processing, and the excellent cushioning and anti-slip properties provided by the elastic interlayer. It evenly distributes stress when clamping pipe fittings, effectively preventing the pipe surface from being crushed or scratched, while simultaneously increasing friction to prevent slippage. Both the elastic interlayer and the metal plates are precisely machined into consistent arc-shaped curved surfaces to ensure maximum contact with the outer wall of the pipe fitting.

[0030] like Figure 2 As shown, the linkage support plate is a set of symmetrical semi-circular plates, including an upper annular plate 9 and a lower annular plate 10. The outer arc of the upper annular plate 9 and the lower annular plate 10 is provided with connection holes for connecting with the connecting seat 11 of the processing machine. The connection holes are connected to the connecting seat 11 by bolts to realize the quick positioning and fixing of the tooling.

[0031] Specifically, the upper annular plate 9 is connected to the first clamping block 1 and the second clamping block 2 via the first rotating shaft 6; the lower annular plate 10 is connected to the third clamping block 3 and the fourth clamping block 4 via the first rotating shaft 6. This stable connection between the clamping assembly and the linkage support plate effectively constrains the vertical displacement of the clamping assembly within the annular frame of the support plate, ensuring stable and controllable clamping action. Furthermore, the entire tooling structure is highly rigid, resisting vibrations and torques during processing, thus guaranteeing machining accuracy. The linkage support plate itself also serves as a guide and limiter for the movement of the clamping assembly.

[0032] The working principle of this utility model:

[0033] The pipe fitting is inserted into the annular center of the four clamping blocks. Then, the connecting rod 8 with bidirectional threads, which passes through the second rotating shaft and connects to the clamping blocks, is rotated. Because the threads rotate in opposite directions, the first clamping block 1, the third clamping block 3, the second clamping block 2, and the fourth clamping block 4 generate opposite axial displacements relative to the connecting rod 8 during rotation. This pushes the four sets of elastic clamping blocks to synchronously retract towards the center or open outward, thereby clamping or loosening the pipe fitting. Tightening the nuts at both ends of the connecting rod 8 locks the axial position of the connecting rod 8, preventing accidental rotation that could lead to clamping failure.

[0034] While the specific embodiments of this disclosure have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of this disclosure. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of this disclosure are still within the scope of protection of this disclosure.

Claims

1. A pipe fitting clamping fixture, characterized in that, It includes a clamping assembly and a linkage support plate; the clamping assembly consists of at least four sets of elastic clamping blocks arranged in a ring to fit the pipe fitting; one end of each elastic clamping block is provided with a first rotating shaft and the other end is provided with a second rotating shaft; the linkage support plate is connected to the clamping assembly through the first rotating shaft, and the second rotating shaft is provided with a through hole perpendicular to the axis of the rotating shaft.

2. The pipe fitting clamping fixture according to claim 1, characterized in that, The elastic clamping block includes a first clamping block, a second clamping block, a third clamping block, and a fourth clamping block. The first clamping block and the second clamping block, as well as the third clamping block and the fourth clamping block, are connected to the first rotating shaft through an arc-shaped connecting plate. The first clamping block and the third clamping block, as well as the second clamping block and the fourth clamping block, are connected through a connecting rod passing through a through hole on the second rotating shaft.

3. The pipe fitting clamping fixture according to claim 1, characterized in that, The second rotating shaft has a threaded hole. The threads of the first and second clamping blocks are positive threads, while the threads of the third and fourth clamping blocks are negative threads.

4. A pipe fitting clamping fixture according to claim 2, characterized in that, The connecting rod is provided with a bidirectional thread corresponding to the thread of the second shaft through hole.

5. A pipe fitting clamping fixture according to claim 1, characterized in that, The linkage support plate is a set of symmetrical semi-circular plates, including an upper circular plate and a lower circular plate. The outer arc of both the upper and lower circular plates is provided with connection holes for connecting to the processing machine connection seat.

6. A pipe fitting clamping fixture according to claim 5, characterized in that, The connecting hole and the connecting seat are connected by bolts.

7. A pipe fitting clamping fixture according to claim 5, characterized in that, The upper annular plate is connected to the first clamping block and the second clamping block, and the lower annular plate is connected to the third clamping block and the fourth clamping block.

8. A pipe fitting clamping fixture according to claim 1, characterized in that, The first rotating shaft has a threaded end, the second rotating shaft is a smooth shaft, the first rotating shaft is longer than the second rotating shaft, and a sleeve is provided on the first rotating shaft, the sleeve being disposed between the elastic clamping block and the linkage support plate.

9. A pipe fitting clamping fixture according to claim 1, characterized in that, The elastic clamping block includes an elastic interlayer and metal plates disposed on both sides of the elastic interlayer. The elastic interlayer and the metal plates have the same shape, both being arc-shaped curved surfaces.

10. A pipe fitting clamping fixture according to claim 2, characterized in that, Nuts that restrict the position of the connecting rod are also provided at both ends of the connecting rod.

Images