A gas cylinder spinning necking device and a necking method

Abstract

The present invention relates to the technical field of spinning forming, and particularly relates to a spinning necking device and a necking method for gas cylinders. The spinning necking device for gas cylinders includes a frame and a clamping component, a spinning component, and an auxiliary component arranged on the frame. The auxiliary component includes a mandrel with one end for extending into the gas cylinder. A stepped surface is provided at the end of the mandrel for extending into the gas cylinder, and the stepped surface is used for supporting and cooperating with the inner wall of the bottleneck of the gas cylinder. A top support structure capable of expanding and contracting in the radial direction of the mandrel is connected to the end of the mandrel for extending into the gas cylinder. After one end of the mandrel extends into the gas cylinder, the top support structure expands and forms a sizing ring groove with the stepped surface. The sizing ring groove is used for positioning and cooperating with the bottle mouth, bottleneck, and bottle shoulder of the gas cylinder. After the necking of the gas cylinder is completed, the top support structure contracts so that the top support structure withdraws from the gas cylinder together with the mandrel. The present invention solves the technical problem in the prior art that the bottle shoulder position cannot be supported, which affects the necking quality of the gas cylinder.

Description

Technical Field

[0001] The present invention relates to the technical field of spin forming, and particularly relates to a gas cylinder spin necking device and a necking method. Background Art

[0002] At present, the necking of gas cylinders is completed through a spin forming process. The specific steps are as follows: One end of a metal tube is heated to a deformable state, and then a spinning component is used to spin form the heated end of the metal tube, so that a bottleneck structure with a diameter smaller than that of the bottle body is formed at one end of the metal tube.

[0003] In the prior art, when necking a gas cylinder, in order to ensure the structural stability of the bottleneck position during necking and the regular shapes of the final bottleneck and bottle mouth, auxiliary support is usually required from inside the bottle mouth of the gas cylinder. For example, a high-precision necking device and a necking method disclosed in a Chinese invention patent application with the application publication number CN116511361A. The necking device includes a clamping component for clamping the gas cylinder, a spinning component for spinning the end of the gas cylinder from the radial two sides of the gas cylinder, and an auxiliary component for extending into the gas cylinder from the bottle mouth of the gas cylinder to assist in supporting the inner wall of the bottle mouth. Another example is a necking method for an aluminum alloy gas cylinder with an increased nozzle wall thickness disclosed in a Chinese invention patent with the authorization publication number CN105170829B. By providing a mandrel with a step at one end, the mandrel is located inside the tailstock carriage. When performing the necking process of the gas cylinder, the tailstock carriage drives the mandrel to extend into the gas cylinder, and then the spinning wheel moves according to the set spinning trajectory. The mandrel supports and shapes from the inside of the gas cylinder. Under the support and shaping effect of the step surface at the end of the mandrel, the necking of the gas cylinder is completed.

[0004] Although the above-mentioned necking device and necking method support and maintain the bottleneck and bottle mouth positions during necking and can keep the shapes of the bottleneck and bottle mouth positions regular, when spinning the bottle mouth, since the bottle shoulder position (the transition position between the bottle body and the bottleneck) is not supported and shaped, it is easy to cause irregular shapes and uneven thicknesses at this position, thereby affecting the overall necking quality of the gas cylinder. Summary of the Invention

[0005] To overcome the deficiencies of the prior art, the present invention proposes a gas cylinder spin necking device and a necking method to solve the technical problem that the bottle shoulder position cannot be supported in the prior art, which affects the necking quality of the gas cylinder.

[0006] The gas cylinder spin necking device and the necking method of the present invention adopt the following technical solutions:

[0007] A gas cylinder spinning necking device and a necking method, comprising a frame and a clamping component, a spinning component and an auxiliary component arranged on the frame. The clamping component is used for clamping the body of the gas cylinder. The spinning component is used for spinning one end of the gas cylinder from the outside of the gas cylinder to form a necking at one end of the gas cylinder. The auxiliary component is used for supporting and cooperating with the inner wall of the gas cylinder when the spinning component spins the gas cylinder. The auxiliary component includes a mandrel with one end for extending into the gas cylinder. The end of the mandrel for extending into the gas cylinder is provided with a stepped surface, and the stepped surface is used for supporting and cooperating with the inner wall of the bottleneck of the gas cylinder. The end of the mandrel for extending into the gas cylinder is connected with a jacking structure capable of expanding and contracting along the radial direction of the mandrel. The jacking structure expands after one end of the mandrel extends into the gas cylinder, and forms a shaping ring groove with the stepped surface. The shaping ring groove is used for positioning and cooperating with the bottle mouth, bottleneck and bottle shoulder of the gas cylinder. The jacking structure contracts after the necking of the gas cylinder is completed, so that the jacking structure withdraws from the gas cylinder together with the mandrel.

[0008] Further, the jacking structure is an umbrella-shaped support structure, including a central cylinder coaxially inserted at one end of the mandrel. An expansion and contraction driving mechanism and a sliding block capable of reciprocating along the axial direction of the central cylinder are arranged in the central cylinder. The expansion and contraction driving mechanism is connected with the sliding block and used for driving the sliding block to reciprocate. A plurality of support rods are hinged on the outer wall of the central cylinder, and the plurality of support rods are arranged at intervals along the circumferential direction of the central cylinder. A connecting rod is connected between the support rod and the sliding block. One end of the connecting rod is hinged with the support rod, and the other end is hinged with the sliding block. When the expansion and contraction driving mechanism drives the sliding block to move towards the direction close to the mandrel, the sliding block drives one end of the support rod to swing away from the central cylinder through the connecting rod, so that the jacking structure expands into an umbrella shape. When the sliding block moves towards the direction away from the mandrel, the sliding block drives one end of the support rod to swing towards the direction close to the central cylinder through the connecting rod, so that the jacking structure contracts.

[0009] Further, the support rod is an arc-shaped rod, the concave surface of the arc-shaped rod faces the central cylinder, and the convex surface of the arc-shaped rod is used for positioning and fitting with the inner wall of the bottle shoulder of the gas cylinder.

[0010] Further, an installation hole is arranged in the mandrel, the central cylinder is inserted into the installation hole, a radial through hole penetrating the inside and outside of the installation hole is opened on the inner wall of the installation hole, a connecting hole is correspondingly opened on the inner wall of the central cylinder, and a fastener is screwed in the radial through hole and the connecting hole to fix the central cylinder in the installation hole of the mandrel.

[0011] Further, a chute extending along the axial direction of the central cylinder is formed on the side wall of the central cylinder. A plurality of the chutes are arranged at intervals along the circumferential direction of the central cylinder. A plurality of first hinge blocks are arranged at intervals on the outer periphery of the sliding block. The first hinge blocks and the support rods are arranged in one-to-one correspondence. Each first hinge block extends into each chute correspondingly. One end of the connecting rod is hinged to the sliding block through the first hinge block. A second hinge block is fixed on the concave surface of the support rod. The other end of the connecting rod is hinged to the support rod through the second hinge block.

[0012] Further, a hinge ear seat is fixed on the outer wall of the central cylinder. One end of the support rod is hinged to the outer wall of the central cylinder through the hinge ear seat.

[0013] Further, the telescopic driving mechanism is a telescopic cylinder. The telescopic cylinder has a cylinder body and a telescopic rod. The cylinder body is fixed in the central cylinder. One end of the telescopic rod is connected to the sliding block.

[0014] Further, the auxiliary component further includes a tailstock. A slide rail is arranged on the frame. The extending direction of the slide rail is parallel to the axis of the mandrel. The tailstock is guidingly installed on the slide rail. The mandrel is movably arranged on the tailstock along its own axial direction.

[0015] Further, the tailstock includes a base and a fixed cylinder fixed on the base. The mandrel is coaxially inserted into the fixed cylinder. An internal thread hole is arranged in the mandrel. A threaded rod is coaxially penetrated in the fixed cylinder. One end of the threaded rod is screwed into the internal thread hole. The other end of the threaded rod is connected with a hand wheel. By rotating the hand wheel, the threaded rod rotates. The rotation of the threaded rod drives the mandrel to move along its own axis in the fixed cylinder.

[0016] A necking method using the above-mentioned gas cylinder spinning necking device includes the following steps: First, clamp the bottle body of the gas cylinder on the clamping component so that one end of the gas cylinder is in a suspended state. Then heat the suspended end of the gas cylinder, drive the tailstock to move towards the gas cylinder with the mandrel, so that one end of the mandrel and the top support structure extend into the gas cylinder. After the top support structure expands, a shaping ring groove is formed with the step surface at the end of the mandrel. Then the spinning component starts to spin the outer wall of the gas cylinder according to a set track. The shaping ring groove supports and positions the inner wall of the gas cylinder, so that the part of the gas cylinder being spun forms a bottleneck and a bottle shoulder in the shaping ring groove.

[0017] The beneficial effects of the present invention are as follows: For a gas cylinder spinning necking device and a necking method thereof according to the present invention, by providing a top support structure that can expand and contract at the end of the mandrel of the auxiliary component, a shaping groove is formed between the expanded top support structure and the step surface at the end of the mandrel. In this way, the bottleneck and the bottle shoulder of the gas cylinder are both spin-formed within the shaping groove. The shaping groove supports and positions the inner walls of the bottleneck and the bottle shoulder from the inside of the gas cylinder, reducing the irregular deformation inside the gas cylinder and enabling better control of the dimensions of the bottleneck and the bottle shoulder of the gas cylinder. Moreover, the shaping groove formed by the top support structure and the step surface of the mandrel confines the bottleneck and the bottle shoulder of the gas cylinder within the shaping groove, reducing the tensile amount in the axial direction of the gas cylinder during spinning and making the thickness of the gas cylinder more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following-described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. Those skilled in the art should understand that these drawings are not necessarily drawn to scale.

[0019] Figure 1 Schematic perspective view of an embodiment of a gas cylinder spinning necking device according to the present invention;

[0020] Figure 2 Front view of an embodiment of a gas cylinder spinning necking device according to the present invention;

[0021] Figure 3 Front view of the auxiliary component in an embodiment of a gas cylinder spinning necking device according to the present invention;

[0022] Figure 4 For Figure 3 right view;

[0023] Figure 5 For Figure 4 A - A cross-sectional view in

[0024] Figure 6 For Figure 5 enlarged schematic view of local area B in

[0025] Figure 7 For Figure 5 another state schematic view of

[0026] Figure 8 For Figure 7 enlarged schematic view of local area D in

[0027] Figure 9Schematic three-dimensional view of the top support structure (open state) in an embodiment of a gas cylinder spinning necking device according to the present invention;

[0028] Figure 10 Front view of the top support structure in an embodiment of a gas cylinder spinning necking device according to the present invention;

[0029] Figure 11 is Figure 10 Cross-sectional view taken along line C-C in

[0030] In the figure: 100, frame; 101, slide rail; 110, spinning component; 111, moving seat; 112, spinning wheel; 120, clamping component; 121, gas cylinder; 200, auxiliary component; 201, handwheel; 202, locking mechanism; 203, mandrel; 204, tailstock; 205, threaded rod; 210, top support structure; 211, central cylinder; 2111, chute; 2112, hinge ear seat; 212, telescopic cylinder; 213, fixing screw; 214, pin; 215, support rod; 2151, second hinge block; 216, connecting rod; 217, sliding block; 2171, first hinge block; 218, mounting hole. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] An embodiment of a gas cylinder spinning necking device and a necking method according to the present invention is as Figures 1 to 11As shown in the figure, the spinning and necking device for gas cylinders includes a frame 100, a clamping component 120, a spinning component 110, and an auxiliary component 200 disposed on the frame 100. The clamping component 120 is used to clamp the body of the gas cylinder 121, and the clamping component 120 is connected with a rotation driving mechanism for driving the clamping component 120 and the gas cylinder 121 to rotate. The spinning component 110 is used to spin one end of the gas cylinder 121 from the outside of the gas cylinder 121, so as to form a necking structure at one end of the gas cylinder 121. The auxiliary component 200 is used to support and cooperate with the inner wall of the gas cylinder 121 when the spinning component 110 spins the gas cylinder 121. In this embodiment, a slide rail 101 is provided on the frame 100, and the spinning component 110 and the auxiliary component 200 are respectively installed on the slide rail 101 in a guiding manner. The spinning component 110 and the auxiliary component 200 can respectively move along the slide rail 101 in a guiding manner to approach and move away from the clamping component 120. The spinning component 110 includes two moving seats 111 that can move relatively and away from each other. A spinning wheel 112 is respectively rotatably provided on each moving seat 111, and the two spinning wheels 112 spin the gas cylinder 121 from the radial two sides of the gas cylinder 121 respectively. In the present invention, the structures of the frame 100, the clamping component 120, and the spinning component 110 are all known in the prior art and will not be described in detail here.

[0033] In the present invention, the auxiliary component 200 includes a tailstock 204 and a mandrel 203 disposed on the tailstock 204. The tailstock 204 is installed on the slide rail 101 in a guiding manner. The tailstock 204 moves along the slide rail 101 in a guiding manner to drive the mandrel 203 to move, so that one end of the mandrel 203 can extend into the gas cylinder 121 or withdraw from the gas cylinder 121. A step surface is provided at one end of the mandrel 203 for extending into the gas cylinder 121, and the step surface is used to support and cooperate with the inner wall of the bottleneck of the gas cylinder 121. A top support structure 210 that can expand and contract along the radial direction of the mandrel 203 is connected to one end of the mandrel 203 for extending into the gas cylinder 121. The top support structure 210 expands after one end of the mandrel 203 extends into the gas cylinder 121, and forms a shaping ring groove with the step surface. The shaping ring groove is used to position and cooperate with the bottle mouth, bottleneck, and bottle shoulder of the gas cylinder 121. The top support structure 210 contracts after the necking of the gas cylinder 121 is completed, so that the top support structure 210 withdraws from the gas cylinder 121 together with the mandrel 203.

[0034] In this embodiment, the top support structure 210 is an umbrella-shaped support structure, including a central cylinder 211 coaxially inserted at one end of the core shaft 203. Specifically, an installation hole 218 is provided in the core shaft 203, the central cylinder 211 is inserted into the installation hole 218, radial through holes penetrating inside and outside the installation hole 218 are formed on the inner wall of the installation hole 218, connection holes are correspondingly formed on the inner wall of the central cylinder 211, and fasteners are screwed into the radial through holes and the connection holes to fix the central cylinder 211 in the installation hole 218 of the core shaft 203. The fasteners include a fixing screw 213 and a pin 214. A telescopic driving mechanism and a sliding block 217 capable of reciprocating axially along the central cylinder 211 are provided in the central cylinder 211. The telescopic driving mechanism is connected to the sliding block 217 and is used to drive the sliding block 217 to reciprocate. A plurality of support rods 215 are hinged to the outer wall of the central cylinder 211, and the plurality of support rods 215 are arranged at intervals along the circumferential direction of the central cylinder 211. A connecting rod 216 is connected between the support rod 215 and the sliding block 217. One end of the connecting rod 216 is hinged to the support rod 215, and the other end is hinged to the sliding block 217.

[0035] In this embodiment, the support rod 215 is an arc-shaped rod, the concave surface of the arc-shaped rod faces the central cylinder 211, and the convex surface of the arc-shaped rod is used for positioning and fitting with the inner wall of the bottle shoulder of the gas cylinder 121. A chute 2111 extending along the axial direction of the central cylinder 211 is formed on the side wall of the central cylinder 211, and a plurality of chutes 2111 are arranged at intervals along the circumferential direction of the central cylinder 211. A plurality of first hinge blocks 2171 are arranged at intervals on the outer circumference of the sliding block 217, and the first hinge blocks 2171 are arranged in one-to-one correspondence with the support rods 215. Each first hinge block 2171 extends into each chute 2111 in one-to-one correspondence. One end of the connecting rod 216 is hinged to the sliding block 217 through the first hinge block 2171, a second hinge block 2151 is fixed on the concave surface of the support rod 215, and the other end of the connecting rod 216 is hinged to the support rod 215 through the second hinge block 2151. A hinge ear seat 2112 is fixed on the outer wall of the central cylinder 211, and one end of the support rod 215 is hinged to the outer wall of the central cylinder 211 through the hinge ear seat 2112. The telescopic driving mechanism is a telescopic cylinder 212. The telescopic cylinder 212 has a cylinder body and a telescopic rod. The cylinder body is fixed in the central cylinder 211, and one end of the telescopic rod is connected to the sliding block 217.

[0036] When the telescopic driving mechanism drives the sliding block 217 to move in the direction close to the core shaft 203, the sliding block 217 drives one end of the support rod 215 to swing away from the central cylinder 211 through the connecting rod 216, so that the top support structure 210 expands into an umbrella shape. At this time, as Figure 8In the state shown, each support rod 215 and the stepped surface at the end of the mandrel 203 enclose a sizing annular groove that encircles the mandrel 203 once. After the spinning member 110 spins the outer wall of the gas cylinder 121 along a set trajectory, a bottleneck and a bottle shoulder can be formed in the sizing annular groove. Among them, the stepped surface on the mandrel 203 supports and positions the bottleneck, and each support rod 215 supports and positions the bottle shoulder. That is to say, the sizing annular groove supports and positions the formed bottleneck and bottle shoulder, which can ensure that the wall thickness of the bottleneck and the bottle shoulder is as uniform as possible and the shape is regular. When the sliding block 217 moves in a direction away from the mandrel 203, the sliding block 217 drives one end of the support rod 215 to swing in a direction close to the central cylinder 211 through the connecting rod 216, so that the top support structure 210 contracts. At this time, as Figure 6 shown in the state, the outer diameter of the top support structure 210 is smaller than the inner diameter of the bottleneck. In this way, after the necking of the gas cylinder 121 is completed, the mandrel 203 can withdraw from the gas cylinder 121 with the top support structure 210.

[0037] In this embodiment, the mandrel 203 is movably arranged on the tailstock 204 along its own axis. The tailstock 204 includes a base and a fixed cylinder fixed on the base. The mandrel 203 is coaxially inserted into the fixed cylinder. An internal threaded hole is provided in the mandrel 203. A threaded rod 205 is coaxially inserted through the fixed cylinder. One end of the threaded rod 205 is screwed into the internal threaded hole, and the other end of the threaded rod 205 is connected with a handwheel 201. By rotating the handwheel 201, the threaded rod 205 is driven to rotate, and the rotation of the threaded rod 205 drives the mandrel 203 to move along its own axis in the fixed cylinder. In this embodiment, a locking mechanism 202 is provided on the side wall of the fixed cylinder. The locking mechanism 202 includes a locking rod swingably arranged on the side wall of the fixed cylinder. When the locking rod is pulled downwards, the end of the locking rod extending into the fixed cylinder is in locking cooperation with the outer wall of the mandrel 203, so that the mandrel 203 is locked at a set position. When the locking rod is pulled upwards, the locking of the mandrel 203 is released. After the tailstock 204 drives the mandrel 203 to move towards the clamping member 120 to a set position, the handwheel 201 is rotated to drive the mandrel 203 to move relative to the fixed cylinder, so that the mandrel 203 extends and extends into the gas cylinder 121.

[0038] A gas cylinder spinning and closing method of the present invention adopts the above-mentioned gas cylinder spinning and closing device, and the closing method includes the following steps: first, the body of the gas cylinder 121 is clamped on the clamping component 120, so that one end of the gas cylinder 121 is in a cantilevered state, and then the cantilevered end of the gas cylinder 121 is heated, and the tailstock 204 is driven to move with the core shaft 203 toward the gas cylinder 121 to a set position, and at the same time, the spinning component 110 moves toward the gas cylinder 121 along the slide rail 101. After the tailstock 204 moves to the set position, the hand-cranked wheel 201 is rotated to drive the core shaft 203 to move toward the inside of the gas cylinder 121, so that one end of the core shaft 203 and the top support structure 210 extend into the gas cylinder 121. In the initial state, the top support structure 210 is in a contracted state, such as Figure 6 As shown, the telescopic cylinder 212 is then controlled to contract, so that the telescopic rod of the telescopic cylinder 212 drives the sliding block 217 to move toward the direction close to the core shaft 203. The sliding block 217 supports each support rod 215 through each connecting rod 216, so that each support rod 215 is opened to form an umbrella shape. After the support structure 210 is expanded, it forms a shaping ring groove with the step surface at the end of the core shaft 203. Then the spinning component 110 starts to spin the outer wall of the gas cylinder 121 according to the set trajectory. The shaping ring groove supports and positions the inner wall of the gas cylinder 121, so that the spun part of the gas cylinder 121 forms a bottleneck and a bottle shoulder in the shaping ring groove, as shown in FIG. Figure 8 After the gas cylinder 121 is closed, the telescopic rod of the telescopic cylinder 212 is controlled to extend, and the telescopic rod drives the sliding block 217 to move away from the core shaft 203. The sliding block 217 drives each supporting rod 215 to retract through each connecting rod 216, so that the entire supporting structure 210 is in a contracted state, and then the hand wheel 201 is rotated to drive the core shaft 203 to withdraw the supporting structure 210 from the gas cylinder 121.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A gas cylinder spinning and closing device, comprising a frame (100) and a clamping component (120), a spinning component (110) and an auxiliary component (200) arranged on the frame (100), wherein the clamping component (120) is used to clamp the body of a gas cylinder (121), the spinning component (110) is used to spin one end of the gas cylinder (121) from the outside of the gas cylinder (121) to form a closed end of the gas cylinder (121), and the auxiliary component (200) is used to support and cooperate with the inner wall of the gas cylinder (121) when the spinning component (110) spins the gas cylinder (121), characterized in that: The auxiliary component (200) comprises a core shaft (203) having one end for inserting into the gas cylinder (121); the end of the core shaft (203) for inserting into the gas cylinder (121) is provided with a step surface, and the step surface is used to support and cooperate with the inner wall of the bottleneck of the gas cylinder (121); the end of the core shaft (203) for inserting into the gas cylinder (121) is connected to a top support structure (210) capable of expanding and contracting along the radial direction of the core shaft (203); the top support structure (210) expands after the end of the core shaft (203) is inserted into the gas cylinder (121), and forms a shaping ring groove with the step surface; the shaping ring groove is used to position and cooperate with the bottle mouth, bottleneck and bottle shoulder of the gas cylinder (121); the top support structure (210) contracts after the gas cylinder (121) is closed, so that the top support structure (210) exits the gas cylinder (121) together with the core shaft (203).

2. The gas cylinder spinning and closing device according to claim 1, characterized in that: The top support structure (210) is an umbrella-shaped support structure, comprising a center tube (211) coaxially inserted at one end of a core shaft (203), wherein a telescopic drive mechanism and a sliding block (217) capable of axially reciprocating along the center tube (211) are provided in the center tube (211), wherein the telescopic drive mechanism is connected to the sliding block (217) and is used to drive the sliding block (217) to reciprocate, wherein a plurality of support rods (215) are hingedly connected to the outer wall of the center tube (211), wherein the plurality of support rods (215) are arranged at intervals along the circumference of the center tube (211), wherein a connecting rod (216) is connected between the support rod (215) and the sliding block (217), wherein the connecting rod (216) is One end is hinged to the support rod (215), and the other end is hinged to the sliding block (217); when the telescopic drive mechanism drives the sliding block (217) to move in a direction close to the core shaft (203), the sliding block (217) drives one end of the support rod (215) to swing in a direction away from the central tube (211) through the connecting rod (216), so that the supporting structure (210) expands into an umbrella shape; when the sliding block (217) moves in a direction away from the core shaft (203), the sliding block (217) drives one end of the support rod (215) to swing in a direction close to the central tube (211) through the connecting rod (216), so that the supporting structure (210) contracts.

3. The gas cylinder spinning and closing device according to claim 2, characterized in that: The support rod (215) is an arc-shaped rod, the concave surface of the arc-shaped rod faces the central tube (211), and the convex surface of the arc-shaped rod is used to position and fit with the inner wall of the bottle shoulder of the gas cylinder (121).

4. The gas cylinder spinning and closing device according to claim 3, characterized in that: The core shaft (203) is provided with a mounting hole (218), the center tube (211) is inserted into the mounting hole (218), the inner wall of the mounting hole (218) is provided with a radial through hole that passes through the inside and outside of the mounting hole (218), and the inner wall of the center tube (211) is provided with a corresponding connecting hole, and fasteners are screwed into the radial through hole and the connecting hole to fix the center tube (211) in the mounting hole (218) of the core shaft (203).

5. The gas cylinder spinning and closing device according to claim 4, characterized in that: A slide groove (2111) extending along the axial direction of the center tube (211) is provided on the side wall of the center tube (211), and a plurality of the slide grooves (2111) are provided at intervals along the circumference of the center tube (211). A plurality of first hinge blocks (2171) are provided at intervals on the outer circumference of the sliding block (217), and the first hinge blocks (2171) are provided in a one-to-one correspondence with the support rod (215). Each first hinge block (2171) extends into each slide groove (2111) in a one-to-one correspondence. One end of the connecting rod (216) is hinged to the sliding block (217) through the first hinge block (2171), and a second hinge block (2151) is fixed on the concave surface of the support rod (215), and the other end of the connecting rod (216) is hinged to the support rod (215) through the second hinge block (2151).

6. The gas cylinder spinning and closing device according to claim 5, characterized in that: A hinged ear seat (2112) is fixed on the outer wall of the central tube (211), and one end of the support rod (215) is hingedly connected to the outer wall of the central tube (211) via the hinged ear seat (2112).

7. The gas cylinder spinning and closing device according to claim 6, characterized in that: The telescopic drive mechanism is a telescopic cylinder (212), the telescopic cylinder (212) comprising a cylinder body and a telescopic rod, the cylinder body being fixed in the central cylinder (211), and one end of the telescopic rod being connected to the sliding block (217).

8. The gas cylinder spinning and closing device according to claim 7, characterized in that: The auxiliary component (200) further comprises a tailstock (204); a slide rail (101) is provided on the frame (100); the extension direction of the slide rail (101) is parallel to the axis of the mandrel (203); the tailstock (204) is guided and mounted on the slide rail (101); and the mandrel (203) is movably arranged on the tailstock (204) along its own axial direction.

9. The gas cylinder spinning and closing device according to claim 8, characterized in that: The tailstock (204) comprises a base and a fixed cylinder fixed on the base, the mandrel (203) is coaxially inserted in the fixed cylinder, an internal threaded hole is provided in the mandrel (203), a threaded rod (205) is coaxially passed through the fixed cylinder, one end of the threaded rod (205) is screwed into the internal threaded hole, and the other end of the threaded rod (205) is connected to a hand-cranked wheel (201), the threaded rod (205) is driven to rotate by rotating the hand-cranked wheel (201), and the threaded rod (205) rotates to drive the mandrel (203) to move along its own axis in the fixed cylinder.

10. A method for closing a gas cylinder using the gas cylinder closing device according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: firstly, clamping the body of a gas cylinder (121) on a clamping component (120) so that one end of the gas cylinder (121) is in a cantilevered state; then, heating the cantilevered end of the gas cylinder (121); driving the tailstock (204) to move with the mandrel (203) toward the gas cylinder (121); making one end of the mandrel (203) and a top support structure (210) extend into the gas cylinder (121); and forming a shaping ring groove with the step surface of the end of the mandrel (203) after the top support structure (210) expands; and then, the spinning component (110) starts to spin the outer wall of the gas cylinder (121) according to a set trajectory; the shaping ring groove supports and positions the inner wall of the gas cylinder (121); and making the spun part of the gas cylinder (121) form a bottleneck and a bottle shoulder in the shaping ring groove.

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