Chuck structure and cold pilger mill

Abstract

The chuck structure comprises a machine frame and a plurality of clamping assemblies which are arranged on the machine frame and used for clamping pipes to be machined, and the clamping assemblies are arranged at intervals to form a containing space used for containing the pipes to be machined. Each clamping assembly comprises at least one clamping piece extending in the axial direction of the to-be-machined pipe, each clamping piece is provided with an arc-shaped clamping face protruding outwards, the clamping faces are in contact fit with the outer surface of the to-be-machined pipe in the axial line direction of the to-be-machined pipe, and each clamping assembly is correspondingly connected with a driving assembly. The driving assembly is used for driving the clamping assembly to move in the direction close to or away from the to-be-machined pipe, and clamping and fixing of pipes with different pipe diameters can be achieved through cooperation of the driving assembly and the clamping assembly.

Description

Technical Field

[0001] The utility model belongs to the technical field of cold-rolling tube mills, in particular to a chuck structure and a cold-rolling tube mill. Background Art

[0002] The chuck is an important component in the cold rolling mill. Its function is to clamp the steel pipe to the rolling center line before the steel pipe enters the rolling area. At the same time, it clamps the steel pipe and drives the steel pipe to make periodic rotational motion to ensure that the rolled steel pipe is round and smooth and has uniform wall thickness.

[0003] In the prior art, most of the chucks used in cold rolling mills are three-jaw chucks, which have the following two problems: 1. The jaws in the three-jaw chuck fix the steel pipe through an inwardly recessed arc clamping portion that matches the outer surface of the steel pipe. When the diameter of the steel pipe changes, it is necessary to replace the jaws of different specifications to adapt to different steel pipes, which not only increases the workload of the operators but also reduces the production efficiency; 2. The jaws in the three-jaw chuck are prone to wear after long-term use, and a gap is easily generated between the jaws and the steel pipe, which makes the steel pipe easy to loosen during the rolling process, thereby affecting the rolling quality of the steel pipe. Utility Model Content

[0004] The utility model aims to provide a chuck structure which can clamp and fix steel pipes with different diameters.

[0005] The utility model is realized through the following technical solutions.

[0006] A chuck structure comprises a frame and a plurality of clamping assemblies arranged on the frame for clamping a pipe to be processed, wherein the plurality of clamping assemblies are arranged at intervals to form an accommodation space for accommodating the pipe to be processed, wherein the clamping assembly comprises at least one clamping piece extending along the axial direction of the pipe to be processed, wherein the clamping piece has an arc-shaped clamping surface protruding outward, wherein the clamping surface is in contact and cooperation with the outer surface of the pipe to be processed along the axial line of the pipe to be processed, and a driving assembly is connected to each of the clamping assemblies, wherein the driving assembly is used to drive the clamping assembly to move in a direction close to or away from the pipe to be processed.

[0007] As a further improvement of the present invention, there are two clamping assemblies, the two clamping assemblies are arranged relatively and spaced apart, and the clamping assembly has two clamping parts, and the two clamping parts are arranged in parallel and spaced apart.

[0008] As a further improvement of the present invention, the two clamping assemblies are arranged symmetrically in the upper and lower parts.

[0009] As a further improvement of the present invention, the clamping assembly further comprises a mounting seat, one end of the mounting seat is connected to the driving assembly, and the other end of the mounting seat is rotatably connected to the clamping member.

[0010] As a further improvement of the present invention, the driving assembly includes a driving member and a telescopic member, the driving member is used to drive the telescopic member to perform telescopic movement, and the telescopic member is connected to the mounting seat.

[0011] As a further improvement of the present invention, an elastic component is provided between the mounting seat and the telescopic member, and the elastic component is used to provide elastic force to the mounting seat along the moving direction of the mounting seat.

[0012] As a further improvement of the utility model, at least one guide column is provided on the frame corresponding to each of the mounting seats, and the guide column penetrates the mounting seat and extends along the moving direction of the mounting seat.

[0013] As a further improvement of the present invention, as a further improvement of the present invention, a limiting member is movably installed on the guide column, and the limiting member is used to limit the moving stroke of the mounting seat.

[0014] As a further improvement of the utility model, a guide sleeve is detachably connected to the frame, and the guide sleeve has a connecting channel connected to the accommodating space, and the connecting channel extends axially along the processed pipe.

[0015] The utility model also provides a cold rolling tube mill, comprising a chuck structure described in the above technical solution.

[0016] Beneficial effects of the utility model:

[0017] 1. The utility model provides a chuck structure, including a frame and a plurality of clamping assemblies, wherein the clamping assembly includes at least one clamping member extending along the axial direction of the pipe to be processed, the clamping member having an arc-shaped clamping surface protruding outward, the clamping surface being in line contact with the outer surface of the pipe to be processed, and at the same time, a driving assembly is connected to each clamping assembly, and the driving assembly is used to drive the clamping assembly to move in a direction close to or away from the pipe to be processed, thereby achieving clamping and fixing of pipes to be processed with different diameters.

[0018] 2. In the present invention, the two clamping assemblies are symmetrically arranged in an upper and lower direction. The clamping assembly has two clamping parts, and the two clamping parts are arranged in parallel and spaced apart, that is, the pipe to be processed can be stably supported and clamped by four clamping surfaces.

[0019] 3. In the present invention, the stability of the movement of the mounting seat can be improved by setting the guide column. At the same time, the limiter movably installed on the guide column can limit the movement stroke of the mounting seat to avoid excessive movement of the clamping member to cause damage to the pipe to be processed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The following is a detailed description of the preferred implementation examples of the present invention with reference to the accompanying drawings to help understand the purpose and advantages of the present invention, wherein:

[0021] Figure 1 It is a structural schematic diagram of a chuck structure in the utility model;

[0022] Figure 2 This is an internal structure diagram of a chuck structure in the utility model;

[0023] Figure 3 for Figure 5 Cross-sectional view along direction BB;

[0024] Figure 4 for Figure 5 Cross-sectional view along AA direction;

[0025] Figure 5 It is a side view of a chuck structure in the utility model;

[0026] In the figure:

[0027] 1. Frame; 2. Clamping assembly; 21. Clamping piece; 22. Mounting seat; 3. Pipe to be processed; 4. Driving assembly; 41. Driving piece; 42. Telescopic piece; 5. Elastic piece; 6. Guide column; 7. Limiting piece; 8. Guide sleeve. DETAILED DESCRIPTION

[0028] The utility model is further described in detail below based on the accompanying drawings and implementation cases.

[0029] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. The words "inside" and "outside" refer to the direction toward or away from the geometric center of a specific component, respectively. They are relative concepts, and therefore may change accordingly according to different locations and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0030] Embodiment 1:

[0031] This embodiment provides a chuck structure, referring to Figures 1 to 3, comprising a frame 1 and a plurality of clamping assemblies 2, the clamping assemblies 2 being arranged on the frame 1, the plurality of clamping assemblies 2 being arranged at intervals to form a receiving space for receiving a pipe 3 to be processed, the clamping assembly 2 comprising at least one cylindrical clamping member 21, the clamping member 21 extending along the axial direction of the pipe 3 to be processed, the clamping member 21 having an arc-shaped clamping surface protruding outwards, since the outer surface of the pipe 3 to be processed is an arc surface, when the clamping surface contacts the outer surface of the pipe to be processed, the two are in line contact, and when the plurality of clamping surfaces contact the pipe 3 to be processed from different directions, the outer surface of the pipe 3 to be processed is in line contact with the outer surface of the pipe 3 to be processed. When the outer surface of the processing pipe 3 is abutted, the pipe 3 to be processed can be clamped and fixed. At the same time, a driving component 4 is connected to each clamping component 2. The driving component 4 is used to drive the clamping component 2 to move towards or away from the pipe 3 to be processed. When the diameter of the pipe 3 to be processed changes, the clamping surface of the clamping component 21 can also be in line contact with the outer surface of the pipe 3 to be processed, and the position of the clamping component 21 can be adjusted by the driving component 4, so as to achieve clamping and fixing of pipes 3 to be processed with different diameters.

[0032] To facilitate the installation of the pipe 3 to be processed, two clamping assemblies 2 are provided, and the two clamping assemblies 2 are symmetrically arranged in the upper and lower directions. Each clamping assembly 2 includes two clamping parts 21, and the two clamping parts 21 are arranged in parallel and spaced apart. The two clamping parts 21 in the clamping assembly 2 located at the bottom can support the pipe 3 to be processed, and cooperate with the clamping assembly 2 located at the top to clamp the pipe 3 to be processed. The pipe 3 to be processed is clamped against the clamping surface of the four clamping parts 21. At this time, the driving assembly 4 is used to control the clamping assembly 2 to move up and down. The distance between the two clamping assemblies 2 can be adjusted by the driving assembly 4, thereby realizing the clamping and fixation of the pipes 3 to be processed with different diameters.

[0033] Furthermore, the clamping assembly 2 also includes a mounting seat 22, one end of the mounting seat 22 is connected to the driving assembly 4, and the other end is connected to the clamping member 21, and the clamping member 21 is rotatably connected to the mounting seat 22. When the steel pipe is rolled, due to the rotational connection between the clamping member 21 and the mounting seat 22, the pipe 3 to be processed can drive the clamping member 21 to rotate during rolling, thereby reducing the friction between the pipe 3 to be processed and the surface of the clamping member 21, which not only helps to reduce the energy loss when the cold rolling mill rolls the steel pipe, but also can increase the service life of the clamping member 21.

[0034] In addition, since the extension direction of the clamping member 21 is the same as the axial direction of the pipe 3 to be processed, the clamping member 21 can guide the pipe 3 to be processed, so that it remains in a straight line during rolling, thereby reducing damage and deformation caused by bending or swinging of the pipe 3 to be processed.

[0035] The driving component 4 includes a driving member 41 and a telescopic member 42. The driving member 41 is used to drive the telescopic member 42 to perform telescopic movement. The telescopic member 42 is connected to the mounting seat 22, that is, the telescopic movement of the telescopic member 42 can drive the mounting seat 22 to move. At the same time, an elastic component 5 is sleeved on the telescopic member 42. The elastic component 5 provides an elastic force to the mounting seat 22 along the moving direction of the mounting seat 22. When the clamping component 2 conflicts with the pipe 3 to be processed, the elastic component 5 can reduce the force of the mounting seat 22 on the telescopic member 42, thereby improving the service life of the driving component 4.

[0036] In this embodiment, in order to ensure the stability of the clamping assembly 2 when it moves, four guide columns 6 are provided corresponding to each clamping assembly 2. The guide columns 6 are extended along the height direction of the frame 1. One end of the four guide columns 6 is fixedly connected to the frame 1, and the other end passes through the mounting seat 22. The four guide columns 6 are evenly distributed on the four corners of the mounting seat 22. The guide columns 6 can improve the stability of the mounting seat 22 when it moves.

[0037] Furthermore, a limit member 7 is movably installed on one end of the guide column 6 close to the mounting seat 22. The limit member 7 can interfere with the mounting seat 22 and prevent the mounting seat 22 from continuing to move, thereby limiting the moving stroke of the mounting seat 22. The limit member 7 is provided on the guide column 6 to prevent the clamping assembly 2 from excessively moving and causing damage to the pipe 3 to be processed.

[0038] Preferably, the limit member 7 and the guide column 6 are threadedly matched, that is, the guide column 6 has an external thread and the limit member 7 has an internal thread. The limit member 7 can move relative to the guide column 6 along the axial direction of the guide column 6, thereby adjusting the position of the limit member 7 to adapt to different specifications of the pipes 3 to be processed.

[0039] In this embodiment, in order to prevent the pipe 3 to be processed from colliding with the clamping assembly 2 when entering the frame 1, a guide sleeve 8 is detachably provided on the frame 1, and a connecting channel connected to the accommodating space is provided in the guide sleeve 8, and the connecting channel extends axially along the pipe 3 to be processed.

[0040] Embodiment 2:

[0041] This embodiment provides a cold rolling mill, including a chuck structure in the above technical solution.

[0042] Finally, it should be noted that the above implementation cases are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the above implementation cases, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above implementation cases, or replace some of the technical features therein with equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the implementation cases of the utility model.

Claims

1. A chuck structure, characterized in that: The invention comprises a frame (1) and a plurality of clamping assemblies (2) arranged on the frame (1) for clamping a pipe (3) to be processed. The plurality of clamping assemblies (2) are arranged at intervals to form a receiving space for receiving the pipe (3) to be processed. The clamping assemblies (2) comprise at least one clamping member (21) extending axially along the pipe (3) to be processed. The clamping member (21) has an arc-shaped clamping surface protruding outwards. The clamping surface is in contact with the outer surface of the pipe (3) to be processed along the axial line of the pipe (3) to be processed. A driving assembly (4) is connected to each of the clamping assemblies (2). The driving assembly (4) is used to drive the clamping assembly (2) to move in a direction close to or away from the pipe (3) to be processed.

2. A chuck structure according to claim 1, characterized in that: There are two clamping assemblies (2), the two clamping assemblies (2) are arranged at a relative interval, and the clamping assembly (2) has two clamping parts (21), and the two clamping parts (21) are arranged in parallel and at a interval.

3. A chuck structure according to claim 2, characterized in that: The two clamping components (2) are arranged symmetrically in an upper and lower direction.

4. A chuck structure according to claim 2, characterized in that: The clamping assembly (2) further comprises a mounting seat (22), one end of the mounting seat (22) being connected to the driving assembly (4) and the other end being rotatably connected to the clamping member (21).

5. A chuck structure according to claim 4, characterized in that: The driving assembly (4) comprises a driving member (41) and a telescopic member (42); the driving member (41) is used to drive the telescopic member (42) to perform telescopic movement; and the telescopic member (42) is connected to the mounting seat (22).

6. A chuck structure according to claim 5, characterized in that: An elastic component (5) is provided between the mounting seat (22) and the telescopic member (42), and the elastic component (5) is used to provide an elastic force to the mounting seat (22) along the moving direction of the mounting seat (22).

7. A chuck structure according to claim 4, characterized in that: At least one guide column (6) is provided on the frame (1) corresponding to each mounting seat (22), and the guide column (6) passes through the mounting seat (22) and extends along the moving direction of the mounting seat (22).

8. A chuck structure according to claim 7, characterized in that: A limiting member (7) is movably mounted on the guide column (6), and the limiting member (7) is used to limit the movement stroke of the mounting seat (22).

9. A chuck structure according to claim 1, characterized in that: The frame (1) is detachably connected to a guide sleeve (8), the guide sleeve (8) having a connection channel connected to the accommodating space, the connection channel extending axially along the pipe (3) to be processed.

10. A cold rolling mill, characterized in that: A chuck structure comprising any one of claims 1 to 9.

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