Cold-drawing machine tongs carriage

Abstract

The utility model provides a kind of cold-drawing machine clamp trolley, including trolley body and clamp mechanism;Clamp mechanism includes power mechanism, plug core subassembly and clamp subassembly, plug core subassembly is driven by power mechanism and is supported in the inner wall of pipe into the clamping end of pipe, clamp subassembly is driven by power mechanism and moves from the circumferential of pipe to the outer wall of pipe until clamping the outer wall of pipe;One end of trolley body is clamping end, and the end is fixed with jaw seat, and jaw seat is provided with the jaw hole for plug core subassembly and clamp subassembly to extend out.The utility model structure design is reasonable, design and clamp body synchronous action plug core, when clamp body is clamped and moves to the direction of outer wall of pipe, plug core is synchronously extended into pipe, when clamp body clamps pipe, plug core is supported on the inner wall of pipe clamping section correspondingly, provide support for pipe clamping stress position when clamping, avoid the deformation of stress position, effectively guarantee the quality of pipe clamping stress position.

Description

Technical Field

[0001] This utility model relates to the field of metal processing machinery technology, and in particular to a clamping trolley for a cold drawing machine. Background Technology

[0002] A cold drawing machine is a device that performs cold working on metal materials at room temperature. It reduces the diameter of the metal while increasing its length using drawing dies, thereby improving the material's precision, surface finish, and mechanical properties. When cold drawing tubes, during the drawing stage, the front end of the tube is pushed out of the drawing die. A pre-tightening cylinder is activated to clamp the tube, while the main cylinder drives a clamping carriage. The clamping carriage grips the tube, generating tension that draws the tube through the die. This reduces the tube's diameter and increases its length. After multiple drawing operations, the target dimensions for cold drawing are achieved. Throughout this process, the clamping carriage must effectively hold the tube.

[0003] Existing clamping trolleys use chuck jaws to grip pipe fittings. During clamping, a power mechanism drives a screw mechanism, which in turn moves the jaws radially along the chuck, causing them to move centripetally relative to the chuck center, thus effectively clamping the pipe fitting. However, for cold drawing machines, this clamping structure requires sufficient clamping force on the outer wall of the pipe fitting during the cold drawing operation. Clamping from the outside onto the outer wall of the pipe fitting can cause significant pressure on the pipe wall. During clamping and subsequent cold drawing operations, the clamping position is prone to deformation due to stress, potentially leading to microcracks or even breakage.

[0004] Therefore, how to improve the design of the clamp carriage on the existing cold drawing machine so that it can effectively clamp the pipe fittings for cold drawing, while ensuring clamping strength and preventing deformation of the pipe fittings, thus ensuring the quality of the pipe fittings, has become an urgent problem to be solved. Utility Model Content

[0005] The technical problem to be solved by this utility model is: in order to overcome the shortcomings of the prior art, this utility model provides a cold drawing machine clamp trolley that can effectively maintain the clamping strength of the pipe during cold drawing operation, while avoiding deformation of the pipe during clamping and ensuring the quality of the pipe at the clamping position.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a clamp trolley for a cold drawing machine, which is slidably set on the cold drawing track of the cold drawing machine for clamping the pipe to be cold drawn. The clamp trolley includes a trolley body and a clamping mechanism; the clamping mechanism includes a power mechanism, a plug assembly and a clamping assembly. The plug assembly extends into the clamping end of the pipe under the drive of the power mechanism and supports the inner wall of the pipe. The clamping assembly moves from the circumference of the pipe to the outer wall of the pipe under the drive of the power mechanism until it clamps the outer wall of the pipe. One end of the trolley body is the clamping end, and a jaw seat is fixed at this end. The jaw seat has a jaw hole for the plug assembly and the clamping assembly to extend out.

[0007] In the above solution, in order to address the problem that the original trolley clamping process would cause the pipe to deform, a mandrel that can be inserted into the pipe is designed at the clamping position. During clamping, the mandrel provides support from the inner wall of the pipe, effectively supporting the clamping force and avoiding excessive force on the pipe during the clamping process.

[0008] Furthermore, the power mechanism includes a clamping cylinder and a piston rod. The clamping cylinder is fixed inside the trolley body, and the piston rod is located at the telescopic end of the clamping cylinder and its telescopic displacement relative to the jaw hole is controlled by the clamping cylinder controller. During clamping, the clamping cylinder actuates to drive the piston rod to extend or retract. Simultaneously, the piston rod's extension or retraction drives the extension or retraction of the plug assembly relative to the pipe opening, as well as the clamping and releasing action of the clamp assembly.

[0009] Furthermore, the clamp assembly includes a connecting seat, which is coaxially fixed to the end face of the piston rod. At least three radial grooves are formed around the connecting seat along its axis. A clamp guide plate slides within each radial groove, and a clamp body is connected to the clamp guide plate. A clamp track is formed on the inner wall of the jaw hole of the jaw seat corresponding to each radial groove. The clamp body slides in conjunction with the corresponding clamp track. The clamp track is located on the conical surface of the same cone, which is coaxially arranged with the jaw hole and the piston rod. The radial grooves limit the clamp guide plate. When the piston rod drives the connecting seat to extend and retract axially, the clamp body, limited by the radial grooves, slides along the clamp guide track, i.e., it moves centripetally on the conical surface of the cone, completing the clamping action on the pipe fitting.

[0010] Preferably, the clamp guide plate has a T-shaped structure. The longitudinal part of the T-shaped structure is fixed to the clamp body through a radial groove. The transverse part of the T-shaped structure and the clamp body limit the longitudinal part and the radial groove from both sides of the connecting seat, so that the clamp guide plate can carry the clamp body to slide smoothly relative to the radial groove. At the same time, it ensures that the clamp guide plate and the clamp body can be relatively positioned with the connecting seat after assembly, and the sliding operation will not cause the assembled parts to fall out of the radial groove of the connecting seat.

[0011] Furthermore, the plug assembly includes a connecting shaft, a plug shaft, and a plug sleeve. One end of the connecting shaft is fixed to the piston rod, and the other end is fixed to the plug shaft. The plug sleeve is wrapped around the outer circumferential surface of the plug shaft, and the outer circumferential surface of the plug sleeve is adapted to the inner wall of the pipe clamping section. When the piston rod moves, it synchronously drives the plug shaft and the plug sleeve to move, completing their insertion and withdrawal relative to the pipe clamping end. During the clamping action, they are inserted synchronously into the pipe and formed inside the pipe. After the cold drawing action is completed, they are synchronously withdrawn from the pipe and detached as the clamp body releases its grip.

[0012] Furthermore, the radial cross-section of the outer circumference of the plug sleeve is an arc that adapts to the outer wall of the pipe at the clamping position of the clamp body, and a connecting line between the near ends of two adjacent arcs at the non-clamping positions. The clamping position corresponds to an arc, adapting to the inner wall of the pipe and providing effective support for the pipe when inserted. The non-clamping position is a connecting line, which is concave relative to the outer edge of the arc. In this way, the non-clamping position will not fill the inner wall of the pipe, thus facilitating guidance when the plug assembly is inserted and making it easier for the plug assembly to smoothly enter the pipe.

[0013] Furthermore, a tube retraction baffle is fixedly provided on the inner wall of the jaw hole of the jaw seat, corresponding to the non-clamping position of the jaw body, protruding towards the axis of the jaw hole. The distance between the tube retraction baffle and the axis of the jaw hole is less than the outer diameter of the pipe. When the clamp body releases its grip and the plug assembly is simultaneously pulled out of the pipe, the tube retraction baffle provides a limit to the end of the pipe, preventing it from retracting synchronously with the plug.

[0014] Preferably, in the assembly of the trolley body and the cold drawing track of the cold drawing machine, a side slide plate is fixed to the lower end face of the trolley body, and the side slide plate is in sliding engagement with the cold drawing track of the cold drawing machine.

[0015] The beneficial effects of this utility model are that the cold drawing machine clamp trolley provided by this utility model has a reasonable structural design. During clamping, a plug core is designed to move synchronously with the clamp body at the position corresponding to the inner wall of the pipe fitting. When the clamp body moves towards the outer wall of the pipe fitting, the plug core extends into the pipe fitting synchronously. When the clamp body effectively clamps the pipe fitting, the plug core is supported on the inner wall of the clamping section of the pipe fitting. The clamp body and the plug core move synchronously, providing support for the clamping force-bearing part of the pipe fitting during clamping, avoiding deformation at the force-bearing part, and effectively ensuring the quality of the clamping force-bearing part of the pipe fitting. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is a perspective view of an embodiment of the present utility model.

[0018] Figure 2 This is a perspective view of another embodiment of the present invention.

[0019] Figure 3 This is a perspective view of the piston rod and clamp assembly in an embodiment of this utility model.

[0020] Figure 4 This is a perspective view of the piston rod, clamp assembly, and jaw seat in an embodiment of this utility model.

[0021] Figure 5 This is a perspective view of the piston rod, connecting seat, and plug core assembly in an embodiment of this utility model.

[0022] In the figure: 1. Cart body; 2. Clamping cylinder; 3. Piston rod; 4. Connecting seat; 5. Clamping end; 6. Clamping track; 7. Clamping body; 8. Jaw pressure plate; 9. Jaw seat; 10. Plug core shaft; 11. Plug core sleeve; 12. Clamping guide plate; 13. Clamping guide block; 14. Tube retraction baffle; 15. Connecting line; 16. Radial groove; 17. Connecting shaft. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention. Therefore, they only show the components relevant to the present invention. Orientations and references (e.g., up, down, left, right, etc.) are only used to aid in the description of the features in the drawings. Therefore, the following specific embodiments are not intended to be restrictive, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

[0024] like Figure 1 The clamping trolley of the cold drawing machine shown is an embodiment of this utility model. It is slidably mounted on the cold drawing track of the cold drawing machine and is used to clamp the pipe to be cold drawn during the cold drawing operation.

[0025] like Figure 1 The clamping trolley shown includes a trolley body 1. A side slide plate is fixed to the lower end face of the trolley body 1. The side slide plate slides in cooperation with the cold drawing track of the cold drawing machine. During the cold drawing operation, the trolley body 1 is moved along the cold drawing track by the oil cylinder / hydraulic cylinder of the cold drawing machine. A clamping mechanism is provided on the trolley body 1. One end of the trolley body 1 is a clamping end 5. A jaw seat 9 is fixed to this end by a jaw pressure plate 8. The jaw seat 9 has jaw holes for the plug core assembly and the clamping assembly to extend out. The clamping mechanism includes a power mechanism, a plug core assembly, and a clamping assembly. The plug core assembly extends into the clamping end 5 of the pipe fitting under the drive of the power mechanism and supports the inner wall of the pipe fitting. The clamping assembly moves from the circumference of the pipe fitting to the outer wall of the pipe fitting under the drive of the power mechanism until it clamps the outer wall of the pipe fitting.

[0026] Specifically, in this embodiment, the power mechanism includes a clamping cylinder 2 and a piston rod 3. The clamping cylinder 2 is fixedly installed inside the trolley body 1 via a cylinder bracket. The piston rod 3 is located at the telescopic end of the clamping cylinder 2 and its telescopic displacement relative to the jaw hole is controlled by the clamping cylinder 2. During clamping, the clamping cylinder 2 moves to drive the piston rod 3 to extend and retract. The extension and retraction of the piston rod 3 simultaneously drives the extension and retraction of the plug assembly relative to the pipe opening and the clamping and releasing action of the clamping assembly.

[0027] like Figure 3As shown, the clamp assembly includes a connecting seat 4, a clamp guide plate 12, and four clamp bodies 7. The connecting seat 4 is coaxially fixed to the end face of the piston rod 3, and four radial grooves 16 are formed around the axis of the connecting seat 4. A clamp guide plate 12 is slidably disposed in each radial groove 16, and a clamp body 7 is fixedly connected to each clamp guide plate 12. A clamp track 6 is formed on the inner wall of the jaw hole of the jaw seat 9 corresponding to each radial groove 16, and the clamp body 7 slides in cooperation with the corresponding clamp track 6. The four clamp tracks 6 are located on the conical surface of the same cone, which is coaxially arranged with the jaw hole and the piston rod 3.

[0028] like Figure 3 and Figure 4 As shown, in the sliding engagement between the clamp body 7 and the clamp track 6, it is preferable to design a clamp guide block 13 with an isosceles trapezoidal radial cross section on the clamp body 7, and the clamp track 6 is also designed with an isosceles trapezoidal cross section. The clamp guide block 13 is slidably disposed in the clamp track 6 and slides along the clamp track 6 as the piston rod 3 extends and retracts.

[0029] In the connection arrangement of the clamp guide plate 12 with the clamp body 7 and the connecting seat 4, the clamp guide plate 12 preferably adopts a T-shaped structure. The longitudinal part of the T-shaped structure is fixed to the clamp body 7 after passing through the radial groove 16. The transverse part of the T-shaped structure and the clamp body 7 respectively limit the longitudinal part and the radial groove 16 from both sides of the connecting seat 4, so that the clamp guide plate 12 can smoothly slide the clamp body 7 relative to the radial groove 16. At the same time, it ensures that the clamp guide plate 12 and the clamp body 7 can be relatively positioned with the connecting seat 4 after assembly, and the sliding operation will not cause the assembled parts to fall out of the radial groove 16 of the connecting seat 4.

[0030] Thus, when the clamp cylinder 2 is activated, the piston rod 3 drives the connecting seat 4 to extend and retract axially. Since the jaw seat 9 is fixed on the clamping end 5, the jaw seat 9 is fixed relative to the piston rod 3. When the piston rod 3 is activated, the clamp body 7 is driven to slide along the clamping track 6 on the jaw seat 9 through the connecting seat 4 and the clamp guide plate 12. The clamp body 7 moves along the conical surface of the cone and moves in a centripetal / reverse direction with the extension / retraction of the piston rod 3, thereby realizing the clamping and releasing operation of the pipe end set on its axis.

[0031] During this process, since the plug core assembly is fixed to the end of the piston rod 3, it extends / retracts relative to the tube in sync with the extension and retraction of the piston rod 3.

[0032] Specifically, such as Figure 5As shown, the plug assembly includes a connecting shaft 7, a plug shaft 10, and a plug sleeve 11. One end of the connecting shaft 7 is fixed to the piston rod 3, and the other end is fixed to the plug shaft 10. The plug sleeve 11 is wrapped around the outer circumferential surface of the plug shaft 10, and the outer circumferential surface of the plug sleeve 11 is adapted to the inner wall of the pipe clamping section. The radial section of the outer circumferential surface of the plug sleeve 11 is an arc that adapts to the outer wall of the pipe at the clamping position of the clamp body 7, and a connecting line 15 between the near ends of two adjacent arcs at non-clamping positions of the clamp body 7. The connecting line 15 is preferably a straight line or an arc with a concave surface.

[0033] When the piston rod 3 actuates, it synchronously drives the plug core shaft 10 and the plug core sleeve 11 to move, completing their insertion and withdrawal relative to the clamping end 5 of the pipe fitting. During the clamping action, they are inserted synchronously into the pipe fitting, and after the cold drawing action, they are simultaneously withdrawn from the pipe fitting as the clamp body 7 releases its grip. The clamping position corresponds to an arc, adapting to the inner wall of the pipe fitting and providing effective support for the pipe fitting when it is inserted deeply. The non-clamping position is the connecting line 15. The outer diameter of the plug core sleeve 11 in the area corresponding to the connecting line 15 is smaller than the outer diameter of the area corresponding to the arc, and the connecting line 15 is concave relative to the outer edge of the arc. In this way, in the non-clamping position, it will not fill the inner wall of the pipe fitting, thus facilitating the guidance when the plug core assembly is inserted, and making it easier for the plug core assembly to enter the pipe fitting smoothly.

[0034] Based on this, the plug assembly needs to extend into the pipe during cold drawing to provide support for the pipe. In this embodiment, a pipe-removal baffle 14 is designed on the inner wall of the jaw hole to assist in the pipe-removal action when the plug assembly retracts from the pipe. Specifically, a pipe-removal baffle 14 is fixedly protruding from the inner wall of the jaw hole of the jaw seat 9, corresponding to the non-clamping position of the clamping body 7, in the direction of the jaw hole axis. In this embodiment, the position of the pipe-removal baffle 14 relative to the circumferential direction of the jaw hole is located between the two clamping bodies 7. The distance between the pipe-removal baffle 14 and the jaw hole axis is less than the outer diameter of the pipe. The position of the pipe-removal baffle 14 along the axial direction of the jaw hole is located behind the axial position when the clamping body 7 clamps the pipe. Thus, when clamping and the clamping body 7 moves centripetally, the plug assembly moves forward synchronously, and the pipe-removal baffle 14 does not interfere with the movement of the clamping body 7. When the clamp body 7 moves away from the pipe and releases the pipe fitting, the plug assembly moves backward in sync. At this time, the pipe retraction baffle 14 provides a limit for the retraction of the pipe fitting, effectively blocking the end of the pipe fitting and preventing it from retracting synchronously with the plug.

[0035] The cold drawing machine clamp trolley designed in this way has a plug core that moves synchronously with the clamp body 7 at the corresponding position of the inner wall of the pipe fitting. When the clamp body 7 moves towards the outer wall of the pipe fitting, the plug core extends into the pipe fitting at the same time. When the clamp body 7 effectively clamps the pipe fitting, the plug core is supported on the inner wall of the clamping section of the pipe fitting. The clamp body 7 and the plug core move synchronously, providing support for the clamping force-bearing part of the pipe fitting during clamping, avoiding deformation at the force-bearing part, and effectively ensuring the quality of the clamping force-bearing part of the pipe fitting.

[0036] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A clamping trolley for a cold drawing machine, slidably mounted on the cold drawing track of the cold drawing machine, for clamping pipe fittings to be cold drawn, characterized in that: The device includes a trolley body and a clamping mechanism. The clamping mechanism includes a power mechanism, a plug assembly, and a clamping assembly. The plug assembly extends into the clamping end of the pipe fitting under the drive of the power mechanism and supports the inner wall of the pipe fitting. The clamping assembly moves from the circumference of the pipe fitting to the outer wall of the pipe fitting under the drive of the power mechanism until it clamps the outer wall of the pipe fitting. One end of the trolley body is a clamping end, and a jaw seat is fixed at this end. The jaw seat has jaw holes for the plug assembly and the clamping assembly to extend out.

2. The cold drawing machine clamp carriage as described in claim 1, characterized in that: The power mechanism includes a clamping cylinder and a piston rod. The clamping cylinder is fixed inside the trolley body, and the piston rod is located at the telescopic end of the clamping cylinder and its telescopic displacement relative to the jaw hole is controlled by the clamping cylinder controller.

3. The cold drawing machine clamp carriage as described in claim 2, characterized in that: The clamp assembly includes a connecting seat, which is coaxially fixed to the end face of the piston rod. The connecting seat has at least three radial grooves around its axis. A clamp guide plate is slidably disposed in each radial groove, and a clamp body is connected to the clamp guide plate. The inner wall of the jaw hole of the jaw seat has clamp tracks corresponding to each radial groove. The clamp body slides in cooperation with the corresponding clamp track. The clamp tracks are located on the conical surface of the same cone, which is coaxially disposed with the jaw hole and the piston rod.

4. The cold drawing machine clamp carriage as described in claim 3, characterized in that: The clamp guide plate is a T-shaped structure. The longitudinal part of the T-shaped structure is fixed to the clamp body through a radial groove. The transverse part of the T-shaped structure and the clamp body limit the longitudinal part and the radial groove from both sides of the connecting seat.

5. The cold drawing machine clamp carriage as described in claim 1, characterized in that: The plug assembly includes a connecting shaft, a plug shaft, and a plug sleeve. One end of the connecting shaft is fixed to the piston rod, and the other end is fixed to the plug shaft. The plug sleeve is wrapped around the outer circumferential surface of the plug shaft, and the outer circumferential surface of the plug sleeve is adapted to the inner wall of the pipe clamping section.

6. The cold drawing machine clamp carriage as described in claim 5, characterized in that: The radial section of the outer periphery of the plug sleeve is an arc that fits the outer wall of the pipe at the clamping position of the clamp body, and is the line connecting the near ends of two adjacent arcs at the non-clamping position of the clamp body.

7. The cold drawing machine clamp carriage as described in claim 6, characterized in that: The inner wall of the jaw hole of the jaw seat is provided with a tube retraction baffle that protrudes from the jaw hole axis at the non-clamping position of the jaw body. The distance between the tube retraction baffle and the jaw hole axis is less than the outer diameter of the pipe.

8. The cold drawing machine clamp carriage as described in claim 1, characterized in that: The lower end face of the trolley body is fixed with a side slide plate, which slides in conjunction with the cold drawing track of the cold drawing machine.

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