Necking device

Abstract

The present invention discloses a necking device, which includes a frame, a first bearing assembly and a necking die. The first bearing assembly is arranged on the frame. The first bearing assembly is provided with a first bearing position for bearing a tubular workpiece. The necking die includes a first bracket, a necking assembly, a pushing assembly and a first driving member. The first bracket is arranged on the frame. The necking assembly includes a connecting member and a plurality of clamping members connected to the connecting member. The connecting member is connected to the first bracket. The plurality of clamping members enclose to form a clamping groove for clamping one end of the tubular workpiece. The pushing assembly is movably arranged on the first bracket and connected to the first driving member. The first driving member is used to drive the pushing assembly to push the clamping members so that the plurality of clamping members contract. In this way, the wear of the clamping members can be reduced to ensure the consistency of the necking size of the tubular workpiece.

Description

Technical Field

[0001] The present invention relates to the technical field of necking machines, and particularly relates to a necking device. Background Art

[0002] As is well known, existing necking devices generally neck tubular workpieces by means of spinning. The tubular workpiece abuts against a spinning die under a high-speed rotation state, so that the diameter of one end of the tubular workpiece is reduced. Since the spinning die abuts against the high-speed rotating tubular workpiece, the wear of the spinning die is relatively serious, resulting in a low service life of the spinning die and poor consistency of the necking size of the tubular workpiece. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a necking device capable of improving the consistency of the necking size of tubular workpieces.

[0004] The necking device according to an embodiment of the present invention includes a frame, a first carrying assembly, and a necking die. The first carrying assembly is provided on the frame. The first carrying assembly is provided with a first carrying position for carrying a tubular workpiece. The necking die includes a first bracket, a necking assembly, a pushing assembly, and a first driving member. The first bracket is provided on the frame. The necking assembly includes a connecting member and a plurality of clamping members connected to the connecting member. The connecting member is connected to the first bracket. The plurality of clamping members enclose to form a clamping groove for clamping one end of the tubular workpiece. The pushing assembly is movably provided on the first bracket and is connected to the first driving member. The first driving member is used to drive the pushing assembly to push the clamping members so that the plurality of clamping members contract.

[0005] The necking device according to an embodiment of the present invention has at least the following beneficial effects:

[0006] When necking the necking device, first place the tubular workpiece on the first carrying position, insert one end of the tubular workpiece into the clamping groove, and then drive the pushing assembly to move through the first driving member. The pushing assembly can push the plurality of clamping members to contract along the direction close to the middle position of the clamping groove, so that the clamping groove shrinks, thereby pushing one end of the tubular workpiece to contract to complete the necking operation of the tubular workpiece. In this way, the technical solution of necking by the traditional spinning method can be abandoned to reduce the wear of the clamping members, thereby ensuring the consistency of the necking size of the tubular workpiece.

[0007] According to some embodiments of the present invention, the clamping member is provided with a clamping surface, and the plurality of clamping surfaces enclose to form the clamping groove. Along the direction from the bottom wall of the clamping groove to the notch of the clamping groove, the width of the clamping surface gradually increases.

[0008] According to some embodiments of the present invention, when the plurality of clamping members contract, among two adjacent clamping members, the side of the clamping surface close to the other clamping member engages with the corresponding side of the adjacent clamping surface.

[0009] According to some embodiments of the present invention, the connecting member includes a connecting portion and an elastic portion. A plurality of the elastic portions are arranged at intervals along the circumferential direction of the connecting portion. The elastic portions correspond to the clamping members one by one. One end of the elastic portion is connected to the connecting portion, and the other end of the elastic portion is connected to the corresponding clamping member.

[0010] According to some embodiments of the present invention, the connecting member and the clamping member are of an integral structure.

[0011] According to some embodiments of the present invention, the pushing component includes a pushing member, a mounting seat, a connecting shaft and a connecting seat. The pushing member is sleeved on the clamping member and connected to the mounting seat. An abutting surface is provided on the outer peripheral side of the clamping member. The inner wall of the pushing component can abut against the abutting surface to cause the plurality of clamping members to contract. The connecting shaft passes through the first bracket. One end of the connecting shaft is connected to the mounting seat, and the other end is connected to the connecting seat. The connecting seat is connected to the output end of the first driving member. A buffer component is provided between the connecting seat and the first bracket, and the buffer component is used to buffer the pushing member.

[0012] According to some embodiments of the present invention, the necking die further includes a second driving member. The first bracket can move in a direction close to and away from the first loading position, and the output end of the second driving member is connected to the first bracket.

[0013] According to some embodiments of the present invention, it further includes a feeding component and a handling component. The feeding component is provided with a feeding position. The handling component includes a first sliding seat, a second sliding seat and a handling member. The first sliding seat is slidably connected to the frame and connected to a third driving member. The second sliding seat is slidably connected to the first sliding seat and connected to a fourth driving member. The handling member is connected to the second sliding seat, and the handling member is provided with a first handling groove. The sliding directions of the first sliding seat and the second sliding seat are staggered. The handling member reciprocates between the feeding component and the first loading component so that the first handling groove can be docked with the feeding position and the first loading position to transport the tubular workpiece at the feeding position to the first loading position.

[0014] According to some embodiments of the present invention, it further includes a welding assembly and a second carrying assembly. The second carrying assembly is arranged side by side and at intervals with the first carrying assembly. The second carrying assembly is provided with a second carrying position. The handling member is provided with a second handling groove. The second handling groove is arranged side by side and at intervals with the first handling groove, so that the second handling groove can be docked with the first carrying position and the second carrying position. The welding assembly is used to seal the necking of the tubular workpiece.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. Description of the Drawings

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 is a schematic structural diagram of the necking device according to an embodiment of the present invention;

[0018] Figure 2 is a schematic structural diagram of the necking die according to an embodiment of the present invention;

[0019] Figure 3 is an assembly schematic diagram of the necking die according to an embodiment of the present invention;

[0020] Figure 4 is a schematic structural diagram of the necking assembly according to an embodiment of the present invention;

[0021] Figure 5 is a cross-sectional view of the necking assembly according to an embodiment of the present invention;

[0022] Figure 6 is a schematic structural diagram of the handling assembly according to an embodiment of the present invention;

[0023] Figure 7 is a schematic structural diagram of the first carrying assembly, the second carrying assembly, the pressing assembly and the rotary driving assembly according to an embodiment of the present invention.

[0024] Reference Signs:

[0025] Frame 100, first bearing assembly 200, first bearing position 210, necking die 300, first bracket 310, necking assembly 320, connecting member 321, connecting portion 3211, elastic portion 3212, clamping member 322, clamping groove 3221, clamping surface 3222, abutting surface 3223, pushing member 331, mounting seat 332, connecting shaft 333, connecting seat 334, buffer assembly 335, first driving member 340, second driving member 350, loading assembly 400, loading bin 410, lifting member 420, fifth driving member 430, handling assembly 500, first sliding seat 510, second sliding seat 520, third driving member 530, fourth driving member 540, handling member 550, first handling groove 551, second handling groove 552, second bearing assembly 600, second bearing position 610, second bracket 710, third sliding seat 720, sixth driving member 730, rotating wheel 740, motor 750, third bracket 760, pressing member 770, seventh driving member 780, welding assembly 800, tubular workpiece 900. Detailed implementation manner

[0026] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0027] In the description of the present invention, it should be understood that with respect to the orientation description, such as the upper, lower, front, rear, left, right, etc. indicating the orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0028] In the description of the present invention, the meaning of several is one or more, the meaning of multiple is more than two, greater than, less than, exceeding, etc. are understood not to include the present number, and above, below, within, etc. are understood to include the present number. If there is a description of first and second, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0029] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0030] Refer to Figures 1 to 3, The necking device according to an embodiment of the present invention includes a frame 100, a first carrying assembly 200 and a necking die 300. The first carrying assembly 200 is disposed on the frame 100. The first carrying assembly 200 is provided with a first carrying position 210 for carrying a tubular workpiece 900. The necking die 300 includes a first bracket 310, a necking assembly 320, a pressing assembly and a first driving member 340. The first bracket 310 is disposed on the frame 100. The necking assembly 320 includes a connecting member 321 and a plurality of clamping members 322 connected to the connecting member 321. The connecting member 321 is connected to the first bracket 310. The plurality of clamping members 322 enclose to form a clamping groove 3221 for clamping one end of the tubular workpiece 900. The pressing assembly is movably disposed on the first bracket 310 and is connected to the first driving member 340. The first driving member 340 is used to drive the pressing assembly to press the clamping members 322 so that the plurality of clamping members 322 contract. In this way, the wear of the clamping members 322 can be reduced to ensure the consistency of the necking size of the tubular workpiece 900.

[0031] Specifically, when necking the necking device, first place the tubular workpiece 900 on the first carrying position 210, insert one end of the tubular workpiece 900 into the clamping groove 3221, and then drive the pressing assembly to move through the first driving member 340. The pressing assembly can press the plurality of clamping members 322 to contract along the middle position close to the clamping groove 3221, so that the clamping groove 3221 shrinks, thereby pressing one end of the tubular workpiece 900 to contract to complete the necking operation of the tubular workpiece 900. In this way, the technical solution of necking by the traditional spinning method can be abandoned to reduce the wear of the clamping members 322, thereby ensuring the consistency of the necking size of the tubular workpiece 900.

[0032] It should be noted that the tubular workpiece 900 can be a copper pipe or a metal pipe of other materials, which will not be elaborated here.

[0033] It should be pointed out that it further includes a pressing assembly. The pressing assembly includes a third bracket 760, a pressing member 770 and a seventh driving member 780. The pressing member 770 can move in the up and down direction to approach and move away from the first carrying position 210. The seventh driving member 780 is connected to the pressing member 770 to drive the pressing member 770 to approach and move away from the first carrying position 210, thereby pressing the tubular workpiece 900 to prevent the tubular workpiece 900 from moving, which will not be elaborated here.

[0034] Refer to Figure 4 、 Figure 5, in some embodiments of the present invention, the clamping member 322 is provided with a clamping surface 3222, and a plurality of clamping surfaces 3222 enclose to form a clamping groove 3221. Along the direction from the bottom wall of the clamping groove 3221 to the notch of the clamping groove 3221, the width of the clamping surface 3222 gradually increases, so that the clamping member 322 can gradually contract one end of the tubular workpiece 900 without generating a stepped structure on the tubular workpiece 900, which can avoid the occurrence of cracking of the tubular workpiece 900 and improve the yield rate of the tubular workpiece 900.

[0035] Specifically, if the width of the clamping surface 3222 is constant along the direction from the bottom wall of the clamping groove 3221 to the notch of the clamping groove 3221, when necking down, a stepped structure will be generated at the clamping position of the edge of the notch of the clamping groove 3221 of the tubular workpiece 900. There is a phenomenon of excessive stress in the stepped structure, which is likely to cause cracking of the tubular workpiece 900. By setting the width of the clamping surface 3222 to gradually increase, it can guide one end of the tubular workpiece 900 to gradually contract without generating a stepped structure on the tubular workpiece 900, which can avoid the occurrence of cracking of the tubular workpiece 900 and improve the yield rate of the tubular workpiece 900.

[0036] It should be noted that the clamping surface 3222 can be a planar structure or a curved surface structure, which will not be elaborated here.

[0037] Refer to Figure 4 、 Figure 5 , in some embodiments of the present invention, when a plurality of clamping members 322 contract, among adjacent two clamping members 322, the side of the clamping surface 3222 close to the other clamping member 322 is joined with the corresponding side of the adjacent clamping surface 3222, which can avoid the occurrence of convex strips on the outer peripheral side of the tubular workpiece 900 being clamped by a plurality of clamping members 322, thereby avoiding the occurrence of cracking of the tubular workpiece 900 and improving the yield rate of the tubular workpiece 900.

[0038] Specifically, when a plurality of clamping members 322 contract, among adjacent two clamping members 322, the side of the clamping surface 3222 close to the other clamping member 322 is joined with the corresponding side of the adjacent clamping surface 3222, so that the side wall of the clamping groove 3221 is in a continuous state without generating gaps, which can avoid the occurrence of convex strips on the outer peripheral side of the tubular workpiece 900 being clamped by a plurality of clamping members 322, thereby avoiding the occurrence of cracking of the tubular workpiece 900 and improving the yield rate of the tubular workpiece 900.

[0039] Refer to Figure 4 、 Figure 5, in some embodiments of the present invention, the connecting member 321 includes a connecting portion 3211 and an elastic portion 3212. A plurality of elastic portions 3212 are configured, and the plurality of elastic portions 3212 are arranged at intervals along the circumferential direction of the connecting portion 3211. The elastic portions 3212 correspond to the clamping members 322 one by one. One end of the elastic portion 3212 is connected to the connecting portion 3211, and the other end of the elastic portion 3212 is connected to the corresponding clamping member 322, so that the plurality of clamping members 322 can elastically open and elastically contract, facilitating the plurality of clamping members 322 to continuously perform necking on different tubular workpieces 900.

[0040] Specifically, a notch is formed between two adjacent elastic portions 3212, and each elastic portion 3212 is connected to a clamping member 322. When the pushing assembly pushes the plurality of clamping members 322 to approach near the middle position of the clamping groove 3221, the elastic portion 3212 can undergo elastic deformation and store elastic potential energy. When the pushing assembly releases the clamping member 322, the elastic potential energy stored in the elastic portion 3212 can be released, driving the plurality of clamping members 322 to elastically open to release the tubular workpiece 900, facilitating the plurality of clamping members 322 to continuously perform necking on different tubular workpieces 900.

[0041] In some embodiments of the present invention, the connecting member 321 and the clamping member 322 are of an integral structure, which can reduce the number of molds, thereby reducing the production and manufacturing cost of the molds, and thus reducing the production and manufacturing cost of the necking equipment.

[0042] Specifically, the connecting member 321 and the clamping member 322 can be integrally formed by die-casting, which can reduce the number of molds, thereby reducing the production and manufacturing cost of the molds, and thus reducing the production and manufacturing cost of the necking equipment.

[0043] Refer to Figure 4 、 Figure 5 , in some embodiments of the present invention, the pushing assembly includes a pushing member 331, a mounting seat 332, a connecting shaft 333 and a connecting seat 334. The pushing member 331 is sleeved on the clamping member 322 and connected to the mounting seat 332. An abutting surface 3223 is provided on the outer peripheral side of the clamping member 322, and the inner wall of the pushing assembly can abut against the abutting surface 3223 to contract the plurality of clamping members 322. The connecting shaft 333 passes through the first bracket 310. One end of the connecting shaft 333 is connected to the mounting seat 332, and the other end is connected to the connecting seat 334. The connecting seat 334 is connected to the output end of the first driving member 340. A buffer assembly 335 is provided between the connecting seat 334 and the first bracket 310. The buffer assembly 335 is used to buffer the pushing member 331, which can buffer the pushing member 331 to avoid the situation that the driving force of the first driving member 340 is too large, resulting in too large a thrust of the pushing member 331 on the clamping member 322 and causing the clamping member 322 to break, and can improve the service life of the clamping member 322.

[0044] Specifically, the mounting seat 332 is disposed on the front side of the first bracket 310, the connecting seat 334 is disposed on the rear side of the first bracket 310, the mounting seat 332 is connected to the connecting seat 334 through a connecting shaft 333, the buffer assembly 335 is a buffer damper, the buffer assembly 335 is disposed on the connecting seat 334, and the buffer end of the buffer assembly 335 faces the mounting seat 332. When the first driving member 340 drives the connecting seat 334 to move, the buffer assembly 335 can buffer the pressing member 331 to prevent the driving force of the first driving member 340 from being too large, resulting in too large a thrust of the pressing member 331 on the clamping member 322 and breaking the clamping member 322, thereby improving the service life of the clamping member 322.

[0045] It should be noted that the buffer assembly 335 can also be a structure such as a compression spring, which will not be elaborated here.

[0046] It should be pointed out that the buffer assembly 335 can also be disposed on the first bracket 310, and the buffer end of the buffer assembly 335 just needs to face the connecting seat 334, which will not be elaborated here.

[0047] It can be understood that the abutting surface 3223 is a bevel structure, the abutting surface 3223 is disposed at one end of the clamping member 322 away from the connecting member 321. When the inner wall of the pressing member 331 abuts against the abutting surface 3223, it can gradually push and press a plurality of clamping members 322 to contract, so as to neck the end of the tubular workpiece 900, which will not be elaborated here.

[0048] Refer to Figure 3 , in some embodiments of the present invention, the necking die 300 further includes a second driving member 350. The first bracket 310 can move in a direction close to and away from the first carrying position 210. The output end of the second driving member 350 is connected to the first bracket 310, so that the periphery of one end of the tubular workpiece 900 can continuously abut against the bottom wall of the clamping groove 3221, so as to ensure that the necking size of the tubular workpiece 900 is the diameter of the bottom wall of the clamping groove 3221, and the consistency of the necking size of the tubular workpiece 900 can be improved.

[0049] Specifically, when multiple clamping members 322 clamp and neck down one end of the tubular workpiece 900, the peripheral edge of one end of the tubular workpiece 900 needs to be abutted against the bottom wall of the clamping groove 3221 to position the tubular workpiece 900. During the necking-down process, the necked-down part of the tubular workpiece 900 shrinks towards the middle, resulting in a shortening of the length of the tubular workpiece 900 in the clamping groove 3221, and the peripheral edge of one end of the tubular workpiece 900 is separated from the bottom wall of the clamping groove 3221, making it impossible to ensure the necking-down size of the tubular workpiece 900. By providing the second driving member 350, it can drive the first bracket 310 to move in a direction close to the first bearing position 210, so that the peripheral edge of one end of the tubular workpiece 900 is abutted against the bottom wall of the clamping groove 3221, and it can ensure that the necking-down size of the tubular workpiece 900 is the diameter of the bottom wall of the clamping groove 3221, thereby improving the consistency of the necking-down size of the tubular workpiece 900.

[0050] Refer to Figure 1 、 Figure 6 In some embodiments of the present invention, it further includes a feeding assembly 400 and a handling assembly 500. The feeding assembly 400 is provided with a feeding position. The handling assembly 500 includes a first sliding seat 510, a second sliding seat 520 and a handling member 550. The first sliding seat 510 is slidably connected to the frame 100 and is connected to a third driving member 530. The second sliding seat 520 is slidably connected to the first sliding seat 510 and is connected to a fourth driving member 540. The handling member 550 is connected to the second sliding seat 520, and the handling member 550 is provided with a first handling groove 551. The sliding directions of the first sliding seat 510 and the second sliding seat 520 are staggered. The handling member 550 reciprocates between the feeding assembly 400 and the first bearing assembly 200, so that the first handling groove 551 can be docked with the feeding position and the first bearing position 210 to transport the tubular workpiece 900 at the feeding position to the first bearing position 210, enabling the necking-down device to automatically feed materials without manual placement of the tubular workpiece 900, and improving the automation level of the necking-down device.

[0051] Specifically, the moving directions of the first sliding seat 510 and the second sliding seat 520 are relatively orthogonal, so that the handling member 550 can move along a biaxial direction. The handling assembly 500 can automatically transport the tubular workpiece 900 located at the feeding position to the first bearing position 210 without manual placement of the tubular workpiece 900, and can improve the automation level of the necking-down device.

[0052] It should be noted that the feeding assembly 400 includes a storage bin and a lifting member 420. The storage bin is arranged on the frame 100 and is provided with a storage space for storing a large number of tubular workpieces 900. The lifting member 420 is movably arranged in the storage space and is connected to a fifth driving member 430. The fifth driving member 430 is used to lift the lifting member 420 so that the lifting member 420 lifts the tubular workpiece 900 to the feeding position for the handling member 550 to transport. Details are not described herein.

[0053] Of course, in some specific embodiments, the handling component 500 can also be a three-axis manipulator or a four-axis manipulator, which can be selected according to specific usage situations and will not be elaborated here.

[0054] Referring to Figure 6 and Figure 7 , in some embodiments of the present invention, it further includes a welding component 800 and a second carrying component 600. The second carrying component 600 is arranged side by side and at intervals with the first carrying component 200. The second carrying component 600 is provided with a second carrying position 610. The handling piece 550 is provided with a second handling groove 552. The second handling groove 552 is arranged side by side and at intervals with the first handling groove 551, so that the second handling groove 552 can be docked with the first carrying position 210 and the second carrying position 610. The welding component 800 is used to seal the necking of the tubular workpiece 900, which is convenient for welding the necked tubular workpiece 900 to seal the necking of the tubular workpiece 900.

[0055] Specifically, the distance between the first carrying position 210 and the second carrying position 610 is equal to the distance between the first handling groove 551 and the second handling groove 552. When the first handling groove 551 transports the tubular workpiece 900 from the loading position to the first carrying position 210, the second handling groove 552 can simultaneously transport the tubular workpiece 900 on the first carrying position 210 to the second carrying position 610, which can improve the necking efficiency of the necking device.

[0056] It can be understood that the welding component 800 is a welding gun mechanism, which can heat-melt the necking of the tubular workpiece 900 to seal the tubular workpiece 900 and will not be elaborated here.

[0057] It should be noted that it further includes a rotation driving component. The rotation driving component includes a second bracket 710, a third sliding seat 720, a sixth driving member 730, a rotating wheel 740 and a motor 750. The third sliding seat 720 can move in the up and down directions to approach and move away from the second carrying position 610. The sixth driving member 730 is connected to the third sliding seat 720 to drive the third sliding seat 720 to approach and move away from the second carrying position 610. The motor 750 is arranged on the third sliding seat 720. The output shaft of the motor 750 is connected to the rotating wheel 740, so that the rotating wheel 740 can drive the tubular workpiece 900 located on the second carrying position 610 to rotate, which is convenient for the welding component 800 to heat-melt the necking of the tubular workpiece 900 and will not be elaborated here.

[0058] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combinations of these technical features do not conflict, they should all be considered as the scope recorded in this specification.

[0059] The above has described this embodiment in detail with reference to the accompanying drawings. However, the present invention is not limited to the above embodiment, and various changes can be made without departing from the gist thereof within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. A necking device, characterized in that, Comprising: A frame (100); A first carrying component (200) provided on the frame (100), the first carrying component (200) being provided with a first carrying position (210) for carrying a tubular workpiece (900); A necking die (300), including a first bracket (310), a necking component (320), a pushing component and a first driving member (340), the first bracket (310) being provided on the frame (100), the necking component (320) including a connecting member (321) and a plurality of clamping members (322) connected to the connecting member (321), the connecting member (321) being connected to the first bracket (310), the plurality of clamping members (322) enclosing to form a clamping groove (3221) for clamping one end of the tubular workpiece (900), the pushing component being movably provided on the first bracket (310) and connected to the first driving member (340), the first driving member (340) being used to drive the pushing component to push the clamping members (322) so that the plurality of clamping members (322) contract; Wherein, the clamping member (322) is provided with a clamping surface (3222), the plurality of clamping surfaces (3222) enclosing to form the clamping groove (3221), and along the direction from the bottom wall of the clamping groove (3221) to the notch of the clamping groove (3221), the width of the clamping surface (3222) gradually increases; The pushing component includes a pushing member (331), a mounting seat (332), a connecting shaft (333) and a connecting seat (334), the pushing member (331) being sleeved on the clamping member (322) and connected to the mounting seat (332), an abutting surface (3223) being provided on the outer peripheral side of the clamping member (322), the inner wall of the pushing component being capable of abutting against the abutting surface (3223) to cause the plurality of clamping members (322) to contract, the connecting shaft (333) passing through the first bracket (310), one end of the connecting shaft (333) being connected to the mounting seat (332) and the other end being connected to the connecting seat (334), the connecting seat (334) being connected to the output end of the first driving member (340), and a buffer component (335) being provided between the connecting seat (334) and the first bracket (310), the buffer component (335) being used to buffer the pushing member (331).

2. The necking device according to claim 1, wherein, When the plurality of clamping members (322) contract, in two adjacent clamping members (322), the side of the clamping surface (3222) close to the other clamping member (322) is joined to the corresponding side of the adjacent clamping surface (3222).

3. The necking device according to claim 1, characterized in that, The connecting member (321) includes a connecting portion (3211) and an elastic portion (3212). A plurality of the elastic portions (3212) are arranged at intervals along the circumferential direction of the connecting portion (3211). The elastic portions (3212) correspond to the clamping members (322) one by one. One end of the elastic portion (3212) is connected to the connecting portion (3211), and the other end of the elastic portion (3212) is connected to the corresponding clamping member (322).

4. The necking device according to claim 1, wherein, The connecting member (321) and the clamping member (322) are of an integral structure.

5. The necking device according to claim 1, characterized in that, The necking die (300) further includes a second driving member (350). The first bracket (310) can move in a direction close to and away from the first loading position (210). The output end of the second driving member (350) is connected to the first bracket (310).

6. The necking device according to claim 1, wherein, It further includes a feeding assembly (400) and a handling assembly (500). The feeding assembly (400) is provided with a feeding position. The handling assembly (500) includes a first sliding seat (510), a second sliding seat (520) and a handling member (550). The first sliding seat (510) is slidably connected to the machine frame (100) and is connected to a third driving member (530). The second sliding seat (520) is slidably connected to the first sliding seat (510) and is connected to a fourth driving member (540). The handling member (550) is connected to the second sliding seat (520), and the handling member (550) is provided with a first handling groove (551). The sliding directions of the first sliding seat (510) and the second sliding seat (520) are staggered. The handling member (550) reciprocates between the feeding assembly (400) and the first loading assembly (200) so that the first handling groove (551) can be docked with the feeding position and the first loading position (210) to transfer the tubular workpiece (900) at the feeding position to the first loading position (210).

7. The necking device according to claim 6, wherein, It further includes a welding assembly (800) and a second loading assembly (600). The second loading assembly (600) is arranged side by side and at intervals with the first loading assembly (200). The second loading assembly (600) is provided with a second loading position (610). The handling member (550) is provided with a second handling groove (552). The second handling groove (552) is arranged side by side and at intervals with the first handling groove (551) so that the second handling groove (552) can be docked with the first loading position (210) and the second loading position (610). The welding assembly (800) is used to seal the necking of the tubular workpiece (900).

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