Metal corrugated pipe clamping and net sleeving device

Abstract

The utility model relates to a metal corrugated pipe clamping and net sleeving device which comprises a rack, a front clamping mechanism and a rear clamping mechanism are correspondingly arranged on the front side and the rear side of the rack respectively, and a net sleeving position of a metal corrugated pipe is formed between the front clamping mechanism and the rear clamping mechanism; the front clamping mechanism comprises a front clamping base and a center positioning assembly, and the center positioning assembly is installed on the front clamping base. The rear clamping mechanism comprises a rear clamping base, an enclasping and net sleeving assembly and a main clamping and net feeding assembly, the enclasping and net sleeving assembly is arranged on the rear clamping base, and the main clamping and net feeding assembly is located on the rear side of the rear clamping base; a first sliding rail is arranged on the portion, located on the lower side of the rear clamping base, of the rack in the front-back direction, and the rear clamping base is driven by a driving mechanism to move front and back along the first sliding rail. According to the application, the demand of manpower can be reduced, and meanwhile, the net sleeving efficiency can be effectively improved.

Description

Technical Field

[0001] The present application relates to the field of net sheathing machines, and more particularly to a metal bellows clamping and net sheathing device for metal bellows. Background Art

[0002] Metal bellows are widely used in some pipeline transports or other pipelines with large temperature differences. Such metal bellows generally include a pipe body in a straight tubular structure, and multiple rings are spacedly arranged at the middle position of the outer wall of the pipe body. When the manufacturer packages the produced metal bellows, most of them will use a net sleeve made of flexible material to cover the metal bellows with a net.

[0003] Currently, since the net sleeve is made of flexible material, it is flat in the normal state. Therefore, the traditional net sheathing method mostly uses manual net sheathing. When sheathing the net, the metal bellows will be firmly clamped by a clamping device first, and then the net will be manually sheathed on the metal bellows.

[0004] However, the inventor believes that this traditional net sheathing method is labor-consuming and has low efficiency. At the same time, since the net sheathing is carried out manually, there will be factors such as extremely unstable efficiency due to different levels of proficiency of workers. Summary of the Utility Model

[0005] In order to reduce the demand for labor and effectively improve the net sheathing efficiency.

[0006] A metal bellows clamping and net sheathing device provided by the present application adopts the following technical solutions:

[0007] A metal bellows clamping and net sheathing device includes a frame. Front and rear clamping mechanisms are respectively and correspondingly arranged on the frame. A net sheathing position for the metal bellows is formed between the front and rear clamping mechanisms. The front clamping mechanism includes a front clamping base and a center positioning component, and the center positioning component is installed on the front clamping base. The rear clamping mechanism includes a rear clamping base, a clamping and net sheathing component, and a main clamping and net feeding component. The clamping and net sheathing component is arranged on the rear clamping base, and the main clamping and net feeding component is located at the rear side position of the rear clamping base. A first slide rail is arranged along the front-rear direction on the frame below the rear clamping base, and the rear clamping base is driven by a driving mechanism to displace back and forth along the first slide rail.

[0008] In some embodiments, the center positioning assembly includes a front positioning base, an external positioning sleeve and an internal positioning shaft. The front positioning base is located at the front side of the front clamping base. The front positioning base can be driven by a driving mechanism to move away from or close to the front clamping base. The external positioning sleeve is installed on the rear end face of the front positioning base. The front clamping base is provided with a first through hole penetrating the front and rear end faces, and the external positioning sleeve is inserted in the first through hole. The front positioning base is provided with a second through hole penetrating the front and rear end faces, and the axis of the second through hole coincides with the axis of the outer positioning sleeve. The inner positioning shaft is inserted in the second through hole and the outer positioning sleeve. The inner positioning shaft is driven by the driving mechanism to be axially displaced relative to the second through hole and the outer positioning sleeve.

[0009] In some embodiments, a limiting tube is disposed at the first mounting hole on the rear end surface of the front clamping base, and the external positioning sleeve can be inserted into the limiting tube when it moves forward and backward.

[0010] In some embodiments, the clamping sleeve net assembly includes a clamping sleeve, a clamping block and a driving ring. The clamping sleeve is installed at the front side of the rear clamping base. The clamping sleeve is evenly distributed along the circumference with a plurality of sliding holes that radially penetrate the inner and outer walls of the clamping sleeve. The clamping blocks are slidingly arranged in each sliding hole one by one. The front end face and / or the rear end face of the clamping sleeve are radially arranged with strip holes corresponding to each sliding hole. The clamping block is provided with a sliding shaft that penetrates the corresponding strip holes. Two driving rings are provided, and the two driving rings are rotatably arranged on the front and rear end faces of the clamping sleeve respectively. The driving ring corresponding to the end face of the clamping sleeve with the strip hole is evenly distributed along the circumference with a plurality of arc holes inclined toward the center of the driving ring, and the sliding shafts are penetrated through the corresponding arc holes one by one.

[0011] In some embodiments, the inner end surface of the clamping block is provided with an arc-shaped end surface, and the center of the arc-shaped end surface coincides with the center of the clamping sleeve.

[0012] In some embodiments, the two outer rings at corresponding positions of the driving rings are fixedly connected via a connecting base, and the connecting base can rotate relative to the outer wall of the clamping sleeve, and a driving mechanism for driving the connecting base is provided on one side of the rear clamping base.

[0013] In some embodiments, the main clamping and net feeding assembly includes an upper support, a lower support, an upper clamping seat and a lower clamping seat. The lower clamping seat is fixedly mounted on the lower support. A second slide rail for sliding the lower support is provided on the frame along the front-to-back direction at the lower side of the lower support. The lower support is driven by a driving mechanism to move forward and backward along the second slide rail. The upper support is fixedly mounted above the lower support through a fixing rod. The upper clamping seat is located between the upper support and the lower clamping seat. A driving mechanism for driving the upper clamping seat to move away from or closer to the lower clamping seat is installed on the upper support.

[0014] In some embodiments, a mesh guide plate is arranged between the upper clamping seat and the lower clamping seat, and the front end of the mesh guide plate extends to the mesh clamping assembly. The mesh guide plate includes a mesh guide base plate and a mesh guide end head. The mesh guide end head is arranged at the front end of the mesh guide base plate, and the cross-section of the mesh guide end head is circular. The upper and lower end surfaces of the front end of the mesh guide base plate are respectively provided with mesh guide protrusions connected to the rear end surface of the mesh guide end head, and the outer edge of the front end surface of the mesh guide protrusion coincides with the corresponding edge of the mesh guide end head, and the cross-sectional area of ​​the mesh guide protrusion gradually decreases from front to back.

[0015] In summary, the present application includes at least one of the following beneficial technical effects: through the cooperation of the front clamping mechanism and the rear clamping mechanism, automatic netting can be achieved, effectively reducing the demand for manpower, and at the same time, the netting efficiency can also be effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a metal bellows clamping mesh device according to an embodiment of the present application.

[0017] Figure 2 It is a structural schematic diagram of a front clamping mechanism in a metal bellows clamping net device in an embodiment of the present application.

[0018] Figure 3 It is a schematic cross-sectional structural diagram of a front clamping mechanism in a metal bellows clamping net device in an embodiment of the present application.

[0019] Figure 4 It is a structural schematic diagram of a metal bellows clamping mesh device in an embodiment of the present application, in which the rear clamping mechanism does not include a main clamping and mesh feeding assembly.

[0020] Figure 5 It is a structural schematic diagram of the cooperation between a clamping sleeve and a clamping block in a metal bellows clamping mesh device according to an embodiment of the present application.

[0021] Figure 6 It is a schematic structural diagram of a clamping block in a metal bellows clamping net device according to an embodiment of the present application.

[0022] Figure 7 It is a schematic structural diagram of a drive ring in a metal bellows clamping mesh device according to an embodiment of the present application.

[0023] Figure 8 It is a structural schematic diagram of a main clamping and mesh feeding assembly in a metal bellows clamping mesh sleeve device according to an embodiment of the present application.

[0024] Figure 9 It is a structural schematic diagram of a mesh guide plate in a metal bellows clamping mesh device in an embodiment of the present application.

[0025] Explanation of the accompanying drawings: 1. front clamping base; 2. front positioning base; 3. outer positioning sleeve; 4. inner positioning shaft; 5. front positioning side substrate; 6. front positioning drive plate; 7. limit tube; 8. rear clamping base; 9. first slide rail; 10. clamping sleeve; 11. clamping block; 12. drive ring; 13. mounting table; 14. support table; 15. strip hole; 16. sliding shaft; 17. arc-shaped end face; 18. arc-shaped hole; 19. connecting base; 20. hinge ear; 21. hinge shaft; 22. upper support; 23. lower support; 24. upper clamping seat; 25. lower clamping seat; 26. second slide rail; 27. guide net substrate; 28. guide net end head; 29. ​​guide net protrusion. DETAILED DESCRIPTION

[0026] The following is combined with Figures 1 to 9 This application is described in further detail.

[0027] The present application embodiment discloses a metal bellows clamping net device, referring to Figure 1 , including a frame, on which a front clamping mechanism and a rear clamping mechanism are respectively arranged on the front and rear sides, and a metal bellows mesh position is formed between the front clamping mechanism and the rear clamping mechanism.

[0028] Reference Figure 2 , 3 In this embodiment, the front clamping mechanism includes a front clamping base 1 and a center positioning assembly, and the center positioning assembly is installed on the front clamping base 1.

[0029] Among them, the center positioning component includes a front positioning base 2, an outer positioning sleeve 3 and an inner positioning shaft 4. The front positioning base 2 is located at the front side position of the front clamping base 1. The front positioning base 2 can be driven by a driving mechanism to move in a direction away from or close to the front clamping base 1. In this embodiment, front positioning side substrates 5 can be set on the opposite sides of the front positioning base 2 in the direction of the front clamping base 1, and the rear ends of the front positioning side substrates 5 are respectively provided with front positioning driving plates 6 in the direction away from the front clamping base 1. The driving mechanism for driving the front positioning base 2 in this embodiment is a cylinder or a hydraulic cylinder or an electric push rod. The front positioning driving plates 6 on both sides are respectively connected to the driving rod ends of the cylinder or the hydraulic cylinder or the electric push rod. Of course, other traditional driving mechanisms can also be used, such as a motor-driven connecting rod mechanism, a motor-driven gear mechanism, etc. The driving mechanisms in this embodiment are all traditional and conventional driving methods, but no matter what kind of driving mechanism is set, it is to assist the core structure to perform corresponding displacement actions, the same below.

[0030] The above-mentioned outer positioning sleeve 3 is installed on the rear end face of the front positioning base 2. The front clamping base 1 is provided with a first through hole penetrating through the front and rear end faces, and the outer positioning sleeve 3 is arranged through the first through hole. The front positioning base 2 is provided with a second through hole penetrating through the front and rear end faces. The axis of the second through hole coincides with the axis of the outer positioning sleeve 3. The inner positioning shaft 4 is arranged through the second through hole and the outer positioning sleeve 3. The inner positioning shaft 4 can be axially displaced relative to the second through hole and the outer positioning sleeve 3 by a driving mechanism. The driving mechanism for driving the inner positioning shaft 4 is a cylinder or a hydraulic cylinder or an electric push rod in this embodiment. In this embodiment, the cylinder or the hydraulic cylinder or the electric push rod for driving the inner positioning shaft 4 can be fixed on the rear end face of the front positioning base 2, and the inner positioning shaft 4 is installed at the end of the driving rod of the cylinder or the hydraulic cylinder or the electric push rod. In addition, in order to realize the fixed relationship between the outer positioning sleeve 3 and the front positioning base 2, the outer positioning sleeve 3 can be installed on the end face of the cylinder or the hydraulic cylinder or the electric push rod facing the front clamping base 1. After such a design, during operation, when the driving mechanism drives the front positioning base 2 to move relative to the front clamping base 1, the outer positioning sleeve 3 and the inner positioning shaft 4 will move synchronously with the front positioning base 2. Moreover, the inner positioning shaft 4 can reciprocate relative to the outer positioning sleeve 3 under the action of the driving rod of the cylinder or the hydraulic cylinder or the electric push rod, so that there are both synchronous cooperation effects and independent working effects among the various components.

[0031] Of course, the cooperation relationship between the driving mechanism and the inner positioning shaft 4 and the outer positioning sleeve 3 here is only one example. For example, the outer positioning sleeve 3 can be directly fixed on the rear end face of the front positioning base 2, and a driving mechanism such as a cylinder or a hydraulic cylinder or an electric push rod can be arranged on the front end face of the front positioning base 2 or on the frame on the front side of the front positioning base 2. The driving rod of the cylinder or the hydraulic cylinder or the electric push rod is connected to the inner positioning shaft 4. In this way, it is also possible to realize the synchronous displacement of the front positioning base 2 driving the inner positioning shaft 4 and the outer positioning sleeve 3. At the same time, the inner positioning shaft 4 can also axially displace relative to the outer positioning sleeve 3.

[0032] In addition, in order to facilitate better clamping and limiting of the metal bellows, a limiting tube 7 can be provided at the rear end face of the front clamping base 1 at the first mounting hole. When the outer positioning sleeve 3 moves back and forth, it can pass through the limiting tube 7.

[0033] Referring to Figure 4 , in this embodiment, the rear clamping mechanism includes a rear clamping base 8, a holding sleeve net assembly, and a main clamping and feeding net assembly. The holding sleeve net assembly is arranged on the rear clamping base 8, and the main clamping and feeding net assembly is located at the rear side position of the rear clamping base 8. A first slide rail 9 is arranged along the front and rear directions on the lower side of the rear clamping base 8 on the frame. The rear clamping base 8 is driven by a driving mechanism to move back and forth along the first slide rail 9.

[0034] The clamping net assembly includes a clamping sleeve 10, a clamping block 11 and a drive ring 12. Figure 5 The clamping sleeve 10 is installed at the front side of the rear clamping base 8. This installation method can be: the left and right sides of the front side of the rear clamping base 8 are respectively provided with mounting platforms 13, and the opposite sides of the clamping sleeve 10 are respectively provided with support platforms 14 that can be installed on the mounting platforms 13. The clamping sleeve 10 is evenly distributed along the circumference with a plurality of sliding holes that radially penetrate the inner and outer walls of the clamping sleeve 10. The clamping blocks 11 are slidably arranged in each sliding hole in a one-to-one correspondence. The front end surface or / and the rear end surface of the clamping sleeve 10 are radially provided with strip holes 15 that correspond to each sliding hole. Figure 6 The clamping block 11 is provided with a sliding shaft 16 which passes through the corresponding strip hole 15. In order to enable the clamping block 11 to match the outer structure of the metal bellows, the inner end face of the clamping block 11 can be provided with an arc end face 17, and the center of the arc end face 17 coincides with the center of the clamping sleeve 10.

[0035] Reference Figure 7 The above-mentioned driving rings 12 are provided with two, and the two driving rings 12 are rotatably arranged on the front and rear end surfaces of the clamping sleeve 10 respectively. The driving ring 12 corresponding to the end surface of the clamping sleeve 10 having the strip hole 15 is uniformly distributed along the circumference with a plurality of arc holes 18 inclined toward the center of the driving ring 12, and the sliding shafts 16 are penetrated through the corresponding arc holes 18 one by one; and in order to enable the two driving rings 12 to rotate synchronously, the outer rings of the two driving rings 12 at corresponding positions are fixedly connected by a connecting base 19, and the connecting base 19 can rotate relative to the outer wall of the clamping sleeve 10. At the same time, a driving mechanism for driving the connecting base 19 is provided on one side of the rear clamping base 8, and the driving mechanism here can be a cylinder or a hydraulic cylinder or an electric push rod. In this embodiment, two hinged ears 20 can be arranged at intervals on the connecting base 19, and the two hinged ears 20 can be connected between them. It is connected by an articulated shaft 21, and the end of the driving rod of the cylinder or hydraulic cylinder or electric push rod can be provided with a hole for the articulated shaft 21 to pass through and relatively rotate. At the same time, the cylinder or hydraulic cylinder or electric push rod can be installed on the mounting table 13 or the support table 14 or the rear clamping base 8. When working, the driving rod of the cylinder or hydraulic cylinder or electric push rod drives the connecting base 19 to work, thereby making the two driving rings 12 rotate relative to the clamping sleeve 10. During the rotation process, due to the design of the inclined arc hole 18, the sliding shaft 16 slides relative to the arc hole 18 and moves toward the center of the clamping sleeve 10. At this time, the sliding shaft 16 slides relative to the strip hole 15, and synchronously drives the clamping block 11 to slide relative to the sliding hole, thereby realizing the movement of multiple clamping blocks 11 evenly distributed along the circumference to approach or move away from the center of the clamping sleeve 10.

[0036] Reference Figure 8In this embodiment, the main clamping and feeding net assembly includes an upper support 22, a lower support 23, an upper clamping seat 24 and a lower clamping seat 25. The lower clamping seat 25 is fixedly installed on the lower support 23. A second slide rail 26 for sliding the lower support 23 is provided on the frame at the lower side of the lower support 23 along the front-to-back direction. The lower support 23 is driven by the driving mechanism to move forward and backward along the second slide rail 26. The upper support 22 is fixedly installed above the lower support 23 through a fixing rod. The upper clamping seat 24 is located between the upper support 22 and the lower clamping seat 25. A driving mechanism is installed on the seat 22 to drive the upper clamping seat 24 to move away from or closer to the lower clamping seat 25. The driving mechanism here can be a cylinder, a hydraulic cylinder or an electric push rod. The cylinder, the hydraulic cylinder or the electric push rod are respectively installed on the top of the upper support 22 and the rack at the rear side of the lower support 23. The driving rod of the cylinder, the hydraulic cylinder or the electric push rod can drive the corresponding upper clamping seat 24 to move away from or closer to the lower clamping seat 25, and drive the corresponding lower support 23 to slide on the second slide rail 26.

[0037] Reference Figure 9 A mesh guide plate is arranged between the upper clamping seat 24 and the lower clamping seat 25, and the front end of the mesh guide plate extends to the place where the mesh assembly is clamped. The mesh guide plate includes a mesh guide base plate 27 and a mesh guide end head 28. The mesh guide end head 28 is arranged at the front end of the mesh guide base plate 27. The cross-section of the mesh guide end head 28 is circular. The upper and lower end surfaces of the front end of the mesh guide base plate 27 are respectively provided with mesh guide protrusions 29 connected to the rear end surface of the mesh guide end head 28. The outer edge of the front end surface of the mesh guide protrusion 29 coincides with the corresponding edge of the mesh guide end head 28, and the cross-sectional area of ​​the mesh guide protrusion 29 gradually decreases from front to back.

[0038] The working method of a metal bellows clamping net device disclosed in this embodiment is as follows. All the displacement movements described below are driven by the corresponding driving mechanism, so the driving part of the driving mechanism is omitted:

[0039] 1. Insert the outer end of the mesh sleeve on the mesh sleeve loading tray from the rear end of the mesh guide base plate 27 until the mesh sleeve is inserted from the rear end of the mesh guide base plate 27 to the mesh guide end head 28, covering the outer wall of the mesh guide end head 28. Since the mesh sleeve has its opposite side walls stuck together in the initial state, the stuck parts can be separated after passing through the mesh guide base plate 27, and the mesh sleeve can be formed into a cylindrical shape through the transition of the mesh guide protrusion 29 to the mesh guide end head 28.

[0040] 2. After the net is put on the net guide plate, the metal bellows is placed in the space between the limit tube 7 and the drive ring 12 manually or by a loading robot, and the position is relatively close to one side of the limit tube 7. Then the front positioning base 2 is displaced toward the front clamping base 1, so that the outer positioning sleeve 3 is connected to the inner positioning shaft 4 and is passed through the metal bellows. At this time, the metal bellows is in the initial positioning stage of the net.

[0041] 3. The upper clamping seat 24 moves toward the lower clamping seat 25 to approach the rear end of the clamping guide mesh base plate 27, and then the lower support 23 moves forward along the second slide rail 26 to the maximum travel of the lower support 23. At the same time, the guide mesh base plate 27 clamped between the upper clamping seat 24 and the lower clamping seat 25 moves toward the rear end of the metal bellows and approaches or abuts against the rear end of the metal bellows.

[0042] 4. The upper clamping seat 24 moves away from the lower clamping seat 25. At the same time, the driving ring 12 rotates clockwise / counterclockwise relative to the clamping sleeve 10. Through the cooperation of the arc hole 18 and the sliding shaft 16, all the clamping blocks 11 move toward the center of the clamping sleeve 10 until they clamp the guide net end 28. Then the lower support 23 moves backward along the second slide rail 26 to the initial position.

[0043] 5. The upper clamping seat 24 moves closer to the lower clamping seat 25 to clamp the rear end of the guide net base plate 27 again, and the driving ring 12 rotates counterclockwise / clockwise relative to the clamping sleeve 10. Through the cooperation of the arc hole 18 and the sliding shaft 16, all the clamping blocks 11 move away from the center direction of the clamping sleeve 10, and then the lower support 23 moves forward along the second slide rail 26 to the maximum travel of the lower support 23. At the same time, the guide net base plate 27 clamped between the upper clamping seat 24 and the lower clamping seat 25 moves toward the rear end of the metal bellows, and makes the guide net end 28 press against the rear end of the metal bellows, and at the same time pushes the metal bellows to move toward the limiting tube 7 until the metal bellows is clamped between the limiting tube 7 and the guide net end 28.

[0044] 6. The driving ring 12 rotates clockwise / counterclockwise relative to the clamping sleeve 10, and through the cooperation of the arc hole 18 and the sliding shaft 16, all the clamping blocks 11 move toward the center direction of the clamping sleeve 10 until the guide net end 28 is clamped. Then, the upper clamping seat 24 moves away from the lower clamping seat 25, and the rear clamping base 8 moves forward along the first slide rail 9. Since the guide net end 28 and the metal bellows are in a tight state, during the process of the rear clamping base 8 moving forward, the net sleeve mounted on the net guide plate is driven by the clamping block 11 to move toward the metal bellows.

[0045] 7. After the rear clamping base 8 moves forward to the maximum stroke, the driving ring 12 rotates counterclockwise / clockwise relative to the clamping sleeve 10. Through the cooperation of the arc-shaped hole 18 and the sliding shaft 16, all the clamping blocks 11 move in a direction away from the center of the clamping sleeve 10. Then, the upper clamping seat 24 moves closer to the lower clamping seat 25 to clamp the guide net substrate 27. Subsequently, the rear clamping base 8 moves backward to the initial position.

[0046] 8. Continuously repeat the steps 6 and 7 above until the mesh sleeve is properly sleeved on the metal bellows.

[0047] 9. The driving ring 12 rotates counterclockwise / clockwise relative to the clamping sleeve 10. Through the cooperation of the arc-shaped hole 18 and the sliding shaft 16, all the clamping blocks 11 move in a direction away from the center of the clamping sleeve 10. At the same time, the upper clamping seat 24 moves away from the lower clamping seat 25. Then, the inner positioning shaft 4 axially displaces backward, pushing the guide net end 28 to displace backward and return to the initial position. The displacement distance is the same as the distance from the initial position to the maximum stroke of the lower support 23. Then, it is cut manually or by using other cutting tool mechanisms.

[0048] 10. After cutting, the upper clamping seat 24 moves closer to the lower clamping seat 25 to clamp the guide net substrate 27. Then, the lower support 23 moves backward along the second slide rail 26 to the initial position.

[0049] 11. Clamp the metal bellows manually or by using a blanking manipulator. Then, the front positioning base 2 displaces in a direction away from the front clamping base 1, so that the outer positioning sleeve 3 and the inner positioning shaft 4 return to the initial position together. At this time, the outer positioning sleeve 3 and the inner positioning shaft 4 also withdraw from the metal bellows together. Subsequently, the metal bellows are blanked manually or by using a blanking manipulator.

[0050] The above are all the preferred embodiments of this application. The protection scope of this application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A metal bellows clamping net device, comprising a frame, characterized in that: A front clamping mechanism and a rear clamping mechanism are respectively arranged on the front and rear sides of the frame, and a mesh position of the metal bellows is formed between the front clamping mechanism and the rear clamping mechanism; the front clamping mechanism comprises a front clamping base (1) and a center positioning component, and the center positioning component is installed on the front clamping base (1); the rear clamping mechanism comprises a rear clamping base (8), a mesh clamping component, and a main clamping mesh feeding component, and the mesh clamping component is arranged on the rear clamping base (8), and the main clamping mesh feeding component is located at the rear side of the rear clamping base (8); a first slide rail (9) is arranged on the frame at the lower side of the rear clamping base (8) along the front-to-back direction, and the rear clamping base (8) is driven by the driving mechanism to move forward and backward along the first slide rail (9).

2. A metal bellows clamping net device according to claim 1, characterized in that: The center positioning assembly comprises a front positioning base (2), an outer positioning sleeve (3) and an inner positioning shaft (4); the front positioning base (2) is located at the front side of the front clamping base (1); the front positioning base (2) can be driven by a driving mechanism to move in a direction away from or close to the front clamping base (1); the outer positioning sleeve (3) is installed on the rear end surface of the front positioning base (2); the front clamping base (1) is provided with a first through hole penetrating the front and rear end surfaces; the outer positioning sleeve (3) is inserted into the first through hole; the front positioning base (2) is provided with a second through hole penetrating the front and rear end surfaces; the axis of the second through hole coincides with the axis of the outer positioning sleeve (3); the inner positioning shaft (4) is inserted into the second through hole and the outer positioning sleeve (3); the inner positioning shaft (4) is driven by the driving mechanism to be axially displaced relative to the second through hole and the outer positioning sleeve (3).

3. A metal bellows clamping net device according to claim 2, characterized in that: A limiting tube (7) is arranged at the first mounting hole on the rear end surface of the front clamping base (1), and the external positioning sleeve (3) can be inserted into the limiting tube (7) when it moves forward and backward.

4. A metal bellows clamping net device according to claim 1, characterized in that: The clamping sleeve net assembly comprises a clamping sleeve (10), a clamping block (11) and a driving ring (12); the clamping sleeve (10) is installed at the front side of the rear clamping base (8); the clamping sleeve (10) is evenly distributed along the circumference with a plurality of sliding holes radially penetrating the inner and outer walls of the clamping sleeve (10); the clamping block (11) is slidably arranged in each sliding hole in a one-to-one correspondence; the front end face or / and the rear end face of the clamping sleeve (10) is radially provided with a strip hole (15) corresponding to each sliding hole in a one-to-one correspondence; The clamping block (11) is provided with a sliding shaft (16) penetrating the corresponding strip hole (15); two driving rings (12) are provided, and the two driving rings (12) are rotatably arranged on the front and rear end surfaces of the clamping sleeve (10) respectively; the driving ring (12) corresponding to the end surface of the clamping sleeve (10) having the strip hole (15) is evenly distributed along the circumference with a plurality of arc holes (18) inclined toward the center of the driving ring (12); and the sliding shafts (16) are correspondingly arranged in the corresponding arc holes (18).

5. A metal bellows clamping net device according to claim 4, characterized in that: The inner end surface of the clamping block (11) is provided with an arc-shaped end surface (17), and the center of the arc-shaped end surface (17) coincides with the center of the clamping sleeve (10).

6. A metal bellows clamping net device according to claim 4, characterized in that: The outer rings of the two driving rings (12) at corresponding positions are fixedly connected via a connecting base (19); the connecting base (19) can rotate relative to the outer wall of the clamping sleeve (10); and a driving mechanism for driving the connecting base (19) is provided on one side of the rear clamping base (8).

7. A metal bellows clamping net device according to claim 1, characterized in that: The main clamping and net feeding assembly comprises an upper support (22), a lower support (23), an upper clamping seat (24) and a lower clamping seat (25); the lower clamping seat (25) is fixedly mounted on the lower support (23); a second slide rail (26) for slidingly mounting the lower support (23) is arranged on the frame at the lower side of the lower support (23) along the front-to-back direction; the lower support (23) is driven by a driving mechanism to move forward and backward along the second slide rail (26); the upper support (22) is fixedly mounted above the lower support (23) by a fixing rod; the upper clamping seat (24) is located between the upper support (22) and the lower clamping seat (25); a driving mechanism for driving the upper clamping seat (24) to move away from or close to the lower clamping seat (25) is installed on the upper support (22).

8. A metal bellows clamping net device according to claim 7, characterized in that: A mesh guide plate is arranged between the upper clamping seat (24) and the lower clamping seat (25), the front end of the mesh guide plate extending to the mesh clamping assembly, the mesh guide plate comprising a mesh guide base plate (27) and a mesh guide end head (28), the mesh guide end head (28) being arranged at the front end of the mesh guide base plate (27), the cross section of the mesh guide end head (28) being arranged in a circular shape, the upper and lower end surfaces of the front end of the mesh guide base plate (27) being respectively provided with mesh guide protrusions (29) connected to the rear end surface of the mesh guide end head (28), the outer edge of the front end surface of the mesh guide protrusion (29) coincides with the corresponding edge of the mesh guide end head (28), and the cross-sectional area of ​​the mesh guide protrusion (29) gradually decreases from front to back.

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