Pipe clamping mechanism for fixed-length cutting in large-diameter pipe production

Abstract

The utility model discloses a pipe clamping mechanism for fixed-length cutting in large-diameter pipe production, which comprises a clamping push rod fixedly mounted around a cutting through groove in the front of a cutting machine along the radial direction, a guide frame fixedly mounted at the telescopic end of the clamping push rod, and a communicating air chamber fixedly mounted on the guide frame, a plurality of piston cylinders parallel to the clamping push rods are fixedly connected to the communicating air chamber, piston bodies and clamping piston rods fixedly connected with the piston bodies are movably connected into the piston cylinders, and elastic clamping cushion blocks used for clamping pipes are installed at the ends, away from the piston bodies, of the clamping piston rods. The elastic clamping cushion block with the buffering stroke and the clamping piston rods are arranged at the telescopic end of the clamping push rod to clamp and position a pipe, the multiple clamping piston rods stretch out and draw back independently so as to adapt to pipes with different diameters, the contact area with the pipe is greatly increased, the contact effect with the pipe is greatly improved, and rigid extrusion with the pipe is avoided; the purposes of protecting the pipe and improving the contact goodness of fit and the clamping effect are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe production, in particular to a pipe clamping mechanism for cutting to length in large-diameter pipe production. Background Art

[0002] During the production and processing of some PE pipes with larger diameters, the processed PE pipes are cut to fixed lengths according to length size standards using a chipless pipe cutting machine. During cutting, the pipes are positioned by the clamping mechanism on the cutting machine to assist in the cutting.

[0003] The clamping mechanism of the existing chipless pipe cutting machine is a push rod type clamping mechanism, and its clamping plate size and angle are fixed. However, in the processing process, large-diameter pipes of different diameters and models are often encountered. The fixed clamping mechanism is used to clamp and position the pipes, and the contact fit with the pipes is not high. Except for a group of pipe models that completely match the shape of the clamping plate, the contact area between other pipes with larger or smaller diameters and the current clamping plate is very small, that is, only the tangent part where the clamping plate contacts the pipe is in contact, which is not conducive to the clamping and positioning effect of the pipe. In order to ensure stable clamping, the clamping push rod needs to increase the clamping force to prevent slipping, which will result in pipe clamping deformation and indentation. Therefore, improving the contact fit is the key to fundamentally improving the clamping effect. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a pipe clamping mechanism for cutting to length in large-diameter pipe production, which is used to solve the problem that the clamping push rod push-type clamping mechanism on the existing chipless pipe cutting machine has a low contact fit with the pipe, affecting the clamping and positioning effect.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0006] A pipe clamping mechanism for cutting to length in large-diameter pipe production comprises a clamping push rod fixedly installed radially around a cutting slot on the front side of a cutting machine, wherein there are three clamping push rods, and the angle between two adjacent clamping push rods is 120°; the clamping push rod located below the cutting slot is vertically arranged; a guide frame is fixedly installed on the telescopic end of the clamping push rod, and the guide frame is slidably connected to a guide column fixedly installed on the front side of the cutting machine; a connecting air chamber is fixedly installed on the guide frame, and a plurality of piston cylinders parallel to the clamping push rods are fixedly connected to the connecting air chamber; a piston body and a clamping piston rod fixedly connected to the piston body are movably connected in the piston cylinder; an elastic clamping pad for clamping pipes is installed on the end of the clamping piston rod away from the piston body.

[0007] Preferably, the guide frame is in a U-shaped structure, and the guide posts are symmetrically arranged on both sides of the guide frame.

[0008] Preferably, the communicating air chamber is in a rectangular parallelepiped structure, the communicating air chamber is fixedly mounted on the bottom of the inner wall of the guide frame, and reinforcing bolts are further installed between the two sides of the communicating air chamber and the guide frame.

[0009] Preferably, a plurality of the piston cylinders are distributed in a matrix at the top of the communicating air chamber, and the lower end of the piston cylinder passes through the top of the communicating air chamber and is fixedly connected to the bottom of the inner wall of the communicating air chamber.

[0010] Preferably, a ventilation groove connected to the communicating air chamber for air inlet and outlet is provided on the side wall of the lower end of the piston cylinder.

[0011] Preferably, the elastic clamping pad is an elastic rubber pad, and the elastic clamping pad is fixedly installed by clamping a connecting seat at the top of the piston rod.

[0012] Preferably, the distance between adjacent connecting seats does not exceed one millimeter, and chamfered structures are provided on the top and bottom edges of the connecting seats.

[0013] Preferably, the clamping piston rod is a connecting rod with a cross-shaped cross section.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] The utility model provides an elastic clamping pad with a buffer stroke and a clamping piston rod at the telescopic end of the clamping push rod to clamp and position the pipe, and several groups of piston cylinders are connected by a connecting air chamber, and multiple clamping piston rods are independently extended and retracted to adapt to pipes of different diameters, thereby greatly increasing the contact area and contact effect with the pipe, and does not rigidly squeeze the pipe, thereby achieving the purpose of protecting the pipe and improving the contact fit and clamping effect, and solving the problem that the contact fit between the clamping push rod propulsion clamping mechanism and the pipe on the existing chipless pipe cutting machine is not high, affecting the clamping and positioning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a front view of the overall structure of the utility model before clamping;

[0017] Figure 2 This is a front view of the overall structure of the utility model after clamping;

[0018] Figure 3 This is a schematic diagram of the structure of the corresponding position of the connecting air chamber of the utility model;

[0019] Figure 4 This is a front cross-sectional view of the corresponding position of the piston cylinder of the utility model;

[0020] Figure 5 It is a top view of the corresponding position of the elastic clamping pad of the utility model.

[0021] In the figure: 1. cutting machine; 101. cutting groove; 2. clamping push rod; 3. guide frame; 4. guide column; 5. connecting air chamber; 6. piston cylinder; 601. ventilation groove; 7. piston body; 8. clamping piston rod; 9. pipe; 10. elastic clamping pad; 11. reinforcement bolt; 12. connecting seat. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] like Figure 1-5 As shown, the utility model provides a technical solution: a pipe clamping mechanism for cutting to length in large-diameter pipe production, comprising a clamping push rod 2 fixedly installed radially around a cutting slot 101 on the front side of a cutting machine 1, wherein there are three clamping push rods 2, and the angle between two adjacent clamping push rods 2 is 120°. The clamping push rod 2 located below the cutting slot 101 is vertically arranged, and a guide frame 3 is fixedly installed at the telescopic end of the clamping push rod 2, and the guide frame 3 is slidably connected to a guide column 4 fixedly installed on the front side of the cutting machine 1, and the guide frame 3 is a U-shaped structure, and the guide columns 4 are symmetrically arranged on both sides of the guide frame 3.

[0024] A connecting air chamber 5 is fixedly installed on the guide frame 3. The connecting air chamber 5 is a rectangular structure. The connecting air chamber 5 is fixedly installed on the bottom of the inner wall of the guide frame 3, and reinforcing bolts 11 are also installed between the two sides of the connecting air chamber 5 and the guide frame 3. A plurality of piston cylinders 6 parallel to the clamping push rod 2 are fixedly connected to the connecting air chamber 5. The plurality of piston cylinders 6 are distributed in a matrix at the top of the connecting air chamber 5, and the lower end of the piston cylinder 6 passes through the top of the connecting air chamber 5 and is fixedly connected to the bottom of the inner wall of the connecting air chamber 5. A ventilation groove 601 connected to the connecting air chamber 5 for air inlet and outlet is provided on the side wall of the lower end of the piston cylinder 6.

[0025] A piston body 7 and a clamping piston rod 8 fixedly connected to the piston body 7 are movably connected inside the piston cylinder 6. The clamping piston rod 8 is a connecting rod with a "cross"-shaped cross-section. An elastic clamping pad 10 for clamping a pipe 9 is installed at one end of the clamping piston rod 8 away from the piston body 7.

[0026] The elastic clamping pad 10 is an elastic rubber pad, which is fixedly installed by clamping the connecting seat 12 at the top of the piston rod 8. The distance between adjacent connecting seats 12 does not exceed one millimeter, and the top and bottom edges of the connecting seat 12 are both provided with chamfered structures.

[0027] Working principle: the pipe 9 is transported from front to back on the production line into the cutting groove 101 of the cutting machine 1, the clamping push rod 2 pushes the guide frame 3 along the guide column 4 to approach the pipe 9, and multiple piston cylinders 6 are interconnected through the connecting air chamber 5. The guide frame 3 drives the connecting air chamber 5, the clamping piston rod 8 and the elastic clamping pad 10 to clamp and fix the pipe 9. When the elastic clamping pad 10 contacts the pipe 9, it can undergo elastic deformation to adapt to the shape of the outer wall of the pipe 9. In addition, the air in the connecting air chamber 5 and the piston cylinder 6 has a certain compression space, and each clamping piston rod 8 can be expanded and contracted separately. When squeezing the outer wall of the pipe 9, they shrink to different degrees and finally adapt to the shape of the pipe 9, thereby improving the contact fit and adapting to pipes 9 of different diameters. The clamping and positioning effect can be improved without increasing the clamping force of the clamping push rod 2.

Claims

1. A pipe clamping mechanism for cutting to length in large-diameter pipe production, comprising a clamping push rod (2) fixedly installed radially around a cutting slot (101) on the front side of a cutting machine (1), wherein there are three clamping push rods (2), the angle between two adjacent clamping push rods (2) is 120°, and the clamping push rod (2) located below the cutting slot (101) is vertically arranged, characterized in that: A guide frame (3) is fixedly mounted on the telescopic end of the clamping push rod (2), and the guide frame (3) is slidably connected to a guide column (4) fixedly mounted on the front of the cutting machine (1). A connecting air chamber (5) is fixedly mounted on the guide frame (3), and a plurality of piston cylinders (6) parallel to the clamping push rod (2) are fixedly connected to the connecting air chamber (5). A piston body (7) and a clamping piston rod (8) fixedly connected to the piston body (7) are movably connected in the piston cylinder (6), and an elastic clamping pad (10) for clamping a pipe (9) is mounted on the end of the clamping piston rod (8) away from the piston body (7).

2. The pipe clamping mechanism for cutting to length in large diameter pipe production according to claim 1 is characterized in that: The guide frame (3) is in a U-shaped structure, and the guide pillars (4) are symmetrically arranged on both sides of the guide frame (3).

3. The pipe clamping mechanism for cutting to length in large diameter pipe production according to claim 2 is characterized in that: The communicating air chamber (5) is in a rectangular parallelepiped structure. The communicating air chamber (5) is fixedly mounted on the bottom of the inner wall of the guide frame (3). Reinforcing bolts (11) are also mounted between the two sides of the communicating air chamber (5) and the guide frame (3).

4. The pipe clamping mechanism for cutting to length in large diameter pipe production according to claim 3 is characterized in that: A plurality of piston cylinders (6) are distributed in a matrix at the top of the communicating air chamber (5), and the lower end of the piston cylinder (6) penetrates the top of the communicating air chamber (5) and is fixedly connected to the bottom of the inner wall of the communicating air chamber (5).

5. The pipe clamping mechanism for cutting to length in large diameter pipe production according to claim 4 is characterized in that: A ventilation groove (601) connected to the communicating air chamber (5) for air inlet and outlet is provided on the side wall of the lower end of the piston cylinder (6).

6. The pipe clamping mechanism for cutting to length in large diameter pipe production according to claim 4, characterized in that: The elastic clamping pad (10) is an elastic rubber pad, and the elastic clamping pad (10) is fixedly installed by clamping a connecting seat (12) at the top of the piston rod (8).

7. The pipe clamping mechanism for cutting to length in large diameter pipe production according to claim 6, characterized in that: The distance between adjacent connecting seats (12) does not exceed one millimeter, and the top and bottom edges of the connecting seats (12) are both provided with chamfered structures.

8. The pipe clamping mechanism for cutting to length in large diameter pipe production according to claim 1, characterized in that: The clamping piston rod (8) is a connecting rod with a cross-section in the shape of a cross.

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