Cold shrink pipe forming device and using method

Abstract

The invention relates to the technical field of cold shrink pipe machining equipment, and provides a cold shrink pipe forming device and a using method.The device comprises a bottom frame, a conveying barrel is fixed to the middle of the top wall of the bottom frame, a spiral extrusion rod is rotatably installed in the conveying barrel, a heating pipe is embedded in the conveying barrel, and the left side of the top wall of the conveying barrel fixedly communicates with a feeding box; a mixing mechanism is arranged in the feeding box; the forming device further comprises a driving mechanism and a forming cylinder. The forming cylinder is fixed to the output end of the conveying cylinder in the mode that a mounting flange is matched with a bolt fastener. By means of the technical scheme, the problems that in cold shrink pipe production, existing equipment generally can only adapt to production of cold shrink pipes of a certain specification, the pipe diameter and the wall thickness cannot be flexibly adjusted, and consequently the requirements of the market for diversified products cannot be met are solved. According to traditional equipment, the conversion process of products of different specifications is tedious, a plurality of key components need to be replaced again, a production line is possibly stopped, and resource waste is caused.

Description

Technical Field

[0001] The present invention relates to the technical field of cold shrink tube processing equipment, and in particular to a cold shrink tube forming device and a use method thereof. Background Art

[0002] Cold shrink tubing is a kind of tubing commonly used in the fields of electricity, communication, transportation, etc. It is widely used in the protection of cables, insulation of wires, protection of communication lines, etc. As a key electrical protection material, the main characteristic of cold shrink tubing is that it shrinks through temperature changes during installation to form a tight protective layer, so it has excellent sealing and resistance to external forces.

[0003] The forming process of cold shrink tubes mainly relies on melting the raw materials through heating and extrusion processes and then extruding them into tubular products. Common production equipment includes independent modules for heating, extrusion, cooling, and forming. In the production of cold shrink tubes, existing equipment can generally only adapt to the production of cold shrink tubes of a certain specification, and cannot flexibly adjust the size of the tube diameter and wall thickness, resulting in an inability to meet the market demand for diversified products. The conversion process of traditional equipment for products of different specifications is cumbersome, and multiple key components need to be replaced again, which may cause the production line to stop, resulting in a waste of resources. Summary of the invention

[0004] The present invention proposes a cold shrink tube forming device and a method for using the same, which solves the problem that the existing equipment in the related art can only produce cold shrink tubes of a certain specification and cannot flexibly adjust the diameter and wall thickness of the tube, resulting in the inability to meet the market demand for diversified products. The conversion process of traditional equipment for products of different specifications is cumbersome, and multiple key components need to be replaced, which may cause the production line to stop, resulting in a waste of resources.

[0005] The technical solution of the present invention is as follows: A cold shrink tube forming device, comprising: A bottom frame, a transmission cylinder is fixed in the middle of the top wall of the bottom frame, a spiral extrusion rod is rotatably installed in the transmission cylinder, a heating tube is embedded in the transmission cylinder, a feed box is fixedly connected to the left side of the top wall of the transmission cylinder, and a mixing mechanism is installed in the feed box; A driving mechanism, the driving mechanism is fixed to the left side of the top wall of the base frame, and the driving mechanism is connected to the spiral extrusion rod and the mixing mechanism through a transmission box; A forming cylinder, wherein the forming cylinder is fixed to the output end of the transmission cylinder through a mounting flange and bolt fasteners, a center column is fixed to the center of the inner cavity of the forming cylinder through a connecting plate, a plurality of outer sleeves are fixed to the inner wall of the forming cylinder through a limiting mechanism, and a plurality of inner sleeves are fixed to the outer wall of the center column through a fixing mechanism.

[0006] Preferably, the mixing mechanism comprises two symmetrically arranged stirring shafts, the stirring shafts are rotatably mounted between the inner walls of the feed box, and stirring blades are staggeredly fixed on the two stirring shafts.

[0007] Preferably, the transmission box is fixed on the outer wall of the feed box, and a transmission mechanism is installed in the transmission box, and the transmission mechanism includes a driving gear and two driven gears, and the driving gear is meshed and connected to any one of the driven gears through the transmission gear, and one end of the spiral extrusion rod passes through the side wall of the transmission cylinder through a bearing and is fixedly connected to the axial center position of the driving gear; The transmission gear is rotatably mounted in the transmission box via a gear shaft; The two driven gears are meshed with each other, and one end of the stirring shaft passes through the side wall of the feed box and the side wall of the transmission box through a bearing and is fixedly connected to the axial center position of the corresponding driven gear.

[0008] Preferably, the driving mechanism comprises a driving motor and a reducer, the driving motor is fixed above the reducer, and the power shaft of the driving motor is fixedly connected to the input shaft of the reducer; The reducer is fixed on the base frame, and the output shaft of the reducer passes through the side wall of the transmission box through a bearing and is fixedly connected to the axis center position of the driving gear.

[0009] Preferably, a cavity is opened inside the forming cylinder, a spiral baffle is fixed in the cavity, and connecting pipes communicating with the interior of the cavity are fixed on both sides of the bottom wall of the forming cylinder.

[0010] Preferably, the limiting mechanism comprises a mounting shell, the mounting shell is fixed to the right end of the outer wall of the forming cylinder, and one end of the mounting shell is threadedly connected with a threaded knob; A limit block is rotatably mounted on one end of the threaded knob; The right end of the forming cylinder is provided with a sliding groove matched with the limiting block; A limiting groove matched with the limiting block is formed at the right end of the outer sleeve.

[0011] Preferably, the fixing mechanism comprises a housing, the housing is fixed to the right end of the central column, and a mounting sleeve is rotatably mounted at the center of the housing; The installation sleeve is connected to the inner wall of the housing through a torsion spring, one end of the installation sleeve passes through the housing side wall through a bearing and fixes an anti-slip convex block, a sliding sleeve outside the installation sleeve is provided with an installation block, and a screw is installed inside the installation sleeve; Connecting rods are rotatably mounted at the corners of the mounting blocks; An L-shaped limiting rod is rotatably mounted on the other end of the connecting rod; One end of the L-shaped limiting rod extends to the outside of the outer shell, and the right end of the inner sleeve is provided with a limiting hole matched with the L-shaped limiting rod; One end of the screw is rotatably mounted on the inner wall of the housing, the other end of the screw slides through the mounting sleeve and is fixed with a knob, and a screw block is screwed onto the screw; The screw block is fixedly connected to the mounting block via a connecting plate.

[0012] Preferably, a plurality of limiting through grooves are symmetrically provided on the outer wall of the installation sleeve, and the connecting plate is slidably installed in the corresponding limiting through grooves.

[0013] Preferably, the left ends of the outer sleeve and the inner sleeve are both provided with a slot that matches the connecting piece.

[0014] A method for using a cold shrink tube forming device comprises the following steps: Step 1: Adjust the number of outer sleeves and inner sleeves according to the size of the cold shrink tube to be produced, and fix the outer sleeve on the inner wall of the forming sleeve through the provided limiting mechanism, and fix the inner sleeve on the outer wall of the center column through the provided fixing mechanism; Step 2: Turn on the driving motor in the driving mechanism. The driving motor drives the driving gear in the transmission box to rotate through the reducer. The driving gear drives the spiral extruder rod to rotate. At the same time, the driving gear drives the driven gear to rotate through the transmission gear, thereby driving the stirring shaft and the stirring blade to rotate. Step 3: Open the heating tube in the transmission cylinder and add the raw materials of the cold shrink tube into the feed box. After the raw materials are mixed by the mixing mechanism, they move to the right end of the transmission cylinder under the action of the spiral extrusion rod. During the movement, the raw materials are heated and melted by the heating tube. The hot-melt raw materials are squeezed into the forming cylinder and extruded into a tube along the gap between the outer sleeve and the inner sleeve. At the same time, cold water is continuously introduced into the cavity through the connecting pipe to cool the cold shrink tube to make a tubular cold shrink tube.

[0015] The beneficial effects of the present invention are: 1. The present invention designs an adjustable outer sleeve and inner sleeve structure, which allows the diameter and wall thickness of the cold shrink tube to be easily adjusted according to different production requirements. The number of outer sleeves and inner sleeves can be changed quickly, so that the equipment can flexibly adapt to production requirements of different sizes and has a wide range of applications.

[0016] 2. In the present invention, through the design of the cavity in the forming cylinder and the setting of the spiral baffle, cold water can be evenly and continuously introduced into the cavity during the pipe forming process, effectively extending the flow path of the cold water, ensuring a more uniform cooling process, and preventing quality problems such as poor shrinkage, deformation or cracks of the pipe caused by uneven temperature.

[0017] 3. The present invention simplifies the installation and disassembly process of the outer sleeve and the inner sleeve through the innovative design of the limiting mechanism and the fixing mechanism. The fixing and disassembly of the outer sleeve and the inner sleeve no longer rely on cumbersome manual operation, but are achieved by rotating the knob and adjusting the threaded knob. Fast and accurate installation and disassembly are achieved. This design not only reduces the workload of manual operation, but also greatly improves maintenance efficiency and reduces downtime caused by equipment maintenance during the production process.

[0018] 4. The present invention can realize the synchronous operation of the spiral extrusion rod and the mixing mechanism through the precise linkage control of the driving mechanism and the transmission mechanism. Different from the traditional equipment, the present device can efficiently complete the mixing, heating, extrusion and molding processes of the raw materials, greatly improving the overall efficiency of the cold shrink tube production. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0020] Figure 1 It is a three-dimensional diagram of the external structure of the present invention; Figure 2 It is a three-dimensional diagram of the drive mechanism and transmission mechanism structure of the present invention; Figure 3 It is a top view of the structure of the present invention; Figure 4 It is a three-dimensional diagram of the external structure of the forming tube of the present invention; Figure 5 It is a structural stereogram of the outer sleeve and the inner sleeve of the present invention in a state of being separated from the forming sleeve; Figure 6 For the present invention Figure 5 The enlarged schematic diagram at A in the middle; Figure 7 It is a half-cut three-dimensional view of the forming tube of the present invention; Figure 8 A three-dimensional diagram of the external structure of the fixing assembly of the present invention; Fig. 9 This is a three-dimensional diagram of a half-section structure of a fixing assembly of the present invention; Fig.10 This is a three-dimensional diagram of the internal structure of the installation sleeve of the present invention.

[0021] In the figure: 1, chassis; 2, transmission cylinder; 3, feed box; 4, mixing mechanism; 41, stirring shaft; 42, stirring blade; 5, driving mechanism; 51, driving motor; 52, reducer; 6, transmission box; 61, driving gear; 62, transmission gear; 63, driven gear; 7, forming cylinder; 8, mounting flange; 9, connecting piece; 10, center column; 11, outer sleeve; 12, limiting mechanism; 121, mounting shell; 122, threaded knob; 12 3. Limit block; 13. Inner sleeve; 14. Fixing mechanism; 141. Outer shell; 142. Mounting sleeve; 143. Torsion spring; 144. Mounting block; 145. Connecting rod; 146. L-shaped limit rod; 147. Screw rod; 148. Screw block; 149. Connecting plate; 1410. Knob; 15. Cavity; 16. Spiral baffle; 17. Connecting pipe; 18. Slot; 19. Limiting slot; 20. Limiting hole; 21. Slide slot; 22. Limiting through slot. DETAILED DESCRIPTION The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Example 1 like Figure 1~Figure 4 and Figure 7 As shown, this embodiment proposes: A cold shrink tube forming device, comprising: A bottom frame 1, a transmission cylinder 2 is fixed in the middle of the top wall of the bottom frame 1, a spiral extrusion rod is rotatably installed in the transmission cylinder 2, a heating tube is embedded in the transmission cylinder 2, a feed box 3 is fixedly connected to the left side of the top wall of the transmission cylinder 2, and a mixing mechanism 4 is installed in the feed box 3; A driving mechanism 5, which is fixed to the left side of the top wall of the bottom frame 1, and is connected to the spiral extrusion rod and the mixing mechanism 4 through a transmission box 6; The forming cylinder 7 is fixed to the output end of the transmission cylinder 2 through the provided mounting flange 8 and bolt fasteners. A center column 10 is fixed to the center of the inner cavity of the forming cylinder 7 through a connecting piece 9. A plurality of outer sleeves 11 are fixed to the inner wall of the forming cylinder 7 through a limiting mechanism 12. A plurality of inner sleeves 13 are fixed to the outer wall of the center column 10 through a fixing mechanism 14.

[0023] A cavity 15 is defined inside the forming cylinder 7 , a spiral baffle 16 is fixed inside the cavity 15 , and connecting pipes 17 communicating with the interior of the cavity 15 are fixed on both sides of the bottom wall of the forming cylinder 7 .

[0024] The left ends of the outer sleeve 11 and the inner sleeve 13 are both provided with a slot 18 that matches with the connecting piece 9 .

[0025] In this embodiment, the transmission cylinder 2 is used to cooperate with the spiral extrusion rod to transport raw materials, the heating tube is used to melt the solid raw materials into a fluid state, the feed box 3 is convenient for adding raw materials to the transmission cylinder 2, the mixing mechanism 4 is used to mix the added raw materials evenly, the driving mechanism 5 is used to drive the spiral extrusion rod and the mixing mechanism 4 to work at the same time through the transmission mechanism, and the overall linkage of the device is strong. The forming cylinder 7 is used to make the extruded mixed material into a tube. By adjusting the number of the outer sleeve 11 and the inner sleeve 13, it is possible to produce cold shrink tubes of different thicknesses and different diameters, and it has a wide range of applications. The limiting mechanism 12 is convenient for the disassembly and installation of the outer sleeve 11, and the fixing mechanism 14 is convenient for the disassembly and installation of the inner sleeve 13. At the same time, a cavity 15 is opened in the forming cylinder 7, and cold water is continuously introduced into the cavity 15 through the connecting pipe 17, and the cold shrink tube is cooled and cooled, and then made into a tubular cold shrink tube. The spiral baffle 16 is provided to extend the flow distance of the cold water in the forming cylinder 7, thereby ensuring the cooling effect.

[0026] Example 2 like Figure 2~Figure 10 As shown, based on the same concept as the above-mentioned embodiment 1, this embodiment further proposes: The mixing mechanism 4 includes two symmetrically arranged stirring shafts 41 , which are rotatably mounted between the inner walls of the feed box 3 , and stirring blades 42 are staggeredly fixed on the two stirring shafts 41 .

[0027] The transmission box 6 is fixed on the outer wall of the feed box 3. A transmission mechanism is installed in the transmission box 6. The transmission mechanism includes a driving gear 61 and two driven gears 63. The driving gear 61 is meshed and connected to any one of the driven gears 63 through the transmission gear 62. One end of the spiral extrusion rod passes through the side wall of the transmission cylinder 2 through a bearing and is fixedly connected to the axial position of the driving gear 61. The transmission gear 62 is rotatably mounted in the transmission box 6 via the gear shaft; The two driven gears 63 mesh with each other, and one end of the stirring shaft 41 passes through the side wall of the feed box 3 and the side wall of the transmission box 6 through a bearing and is fixedly connected to the axial center position of the corresponding driven gear 63.

[0028] The driving mechanism 5 includes a driving motor 51 and a reducer 52. The driving motor 51 is fixed above the reducer 52. The power shaft of the driving motor 51 is fixedly connected to the input shaft of the reducer 52. The reducer 52 is fixed on the base frame 1 , and the output shaft of the reducer 52 passes through the side wall of the transmission box 6 through a bearing and is fixedly connected to the axis center position of the driving gear 61 .

[0029] In this embodiment, the driving mechanism 5 can drive the spiral extrusion rod and the mixing mechanism 4 to work at the same time through the transmission mechanism, the overall linkage of the device is strong, and the mixing mechanism 4 can mix the added raw materials evenly. When the driving mechanism 5 is working, the driving motor 51 drives the driving gear 61 in the transmission box 6 to rotate through the reducer 52, and the driving gear 61 drives the spiral extrusion rod to rotate. At the same time, the driving gear 61 drives the driven gear 63 to rotate through the transmission gear 62, and then drives the stirring shaft 41 and the stirring blade 42 to rotate, so as to achieve the mixing of the raw materials and the transportation of the raw materials at the same time.

[0030] The limiting mechanism 12 includes a mounting shell 121, which is fixed to the right end of the outer wall of the forming cylinder 7, and one end of the mounting shell 121 is threadedly connected with a threaded knob 122; One end of the threaded knob 122 is rotatably mounted with a limit block 123; The right end of the forming cylinder 7 is provided with a slide groove 21 which cooperates with the limit block 123; A limiting groove 19 which cooperates with the limiting block 123 is formed at the right end of the outer sleeve 11 .

[0031] The fixing mechanism 14 includes a housing 141, which is fixed to the right end of the center column 10, and a mounting sleeve 142 is rotatably mounted at the center of the housing 141; The mounting sleeve 142 is connected to the inner wall of the housing 141 through a torsion spring 143. One end of the mounting sleeve 142 passes through the side wall of the housing 141 through a bearing and fixes the anti-slip convex block. The outer sliding sleeve of the mounting sleeve 142 is provided with a mounting block 144. The mounting sleeve 142 is provided with a screw rod 147. Connecting rods 145 are rotatably mounted at the corners of the mounting block 144; An L-shaped limiting rod 146 is rotatably mounted on the other end of the connecting rod 145; One end of the L-shaped limiting rod 146 extends to the outside of the housing 141, and a limiting hole 20 matching with the L-shaped limiting rod 146 is formed at the right end of the inner sleeve 13; One end of the screw rod 147 is rotatably mounted on the inner wall of the housing 141 , and the other end of the screw rod 147 slides through the mounting sleeve 142 and is fixed with a knob 1410 . A screw block 148 is screwed onto the screw rod 147 . The screw block 148 is fixedly connected to the mounting block 144 via the connecting plate 149 .

[0032] A plurality of limiting slots 22 are symmetrically formed on the outer wall of the mounting sleeve 142 , and the connecting plates 149 are slidably mounted in the corresponding limiting slots 22 .

[0033] In this embodiment, the limiting mechanism 12 is provided to facilitate the disassembly and installation of the outer sleeve 11, and the fixing mechanism 14 is provided to facilitate the disassembly and installation of the inner sleeve 13. By adjusting the number of the outer sleeve 11 and the inner sleeve 13, it is possible to produce cold shrink tubes of different thicknesses and different diameters, and the application range is wide. When the outer sleeve 11 needs to be fixed, the threaded knob 122 is turned to control the position of the limiting block 123, so that the limiting block 123 is inserted into the limiting groove 19 on the corresponding outer sleeve 11 to complete the fixing of the outer sleeve 11. When the inner sleeve 13 needs to be fixed, one hand pinches the anti-slip protrusion position of the mounting sleeve 142, and the other hand turns the knob 1410. The knob 1410 drives the screw 147 to rotate, and the screw 147 drives the mounting block 144 to move outward along the mounting sleeve 142 through the screw block 148 and the connecting plate 149 until the L-shaped limit rod 146 is disengaged from the limit hole 20 of the current inner sleeve 13, and then the mounting sleeve 142 is rotated. The mounting sleeve 142 drives the L-shaped limit rod 146 to move through the connecting rod 145 until the block on the L-shaped limit rod 146 moves to the limit hole 20 position of the inner sleeve 13 to be fixed, and the knob 1410 is reversed to make the L-shaped limit rod 146 snap into the limit hole 20 of the current inner sleeve 13 to complete the fixation of the corresponding inner sleeve 13.

[0034] Working principle: according to the size of the shrink tube to be produced, the number of the outer sleeve 11 and the inner sleeve 13 is adjusted, and the outer sleeve 11 is fixed to the inner wall of the forming sleeve 7 by the provided limiting mechanism 12, and the inner sleeve 13 is fixed to the outer wall of the central column 10 by the provided fixing mechanism 14; the driving motor 51 in the driving mechanism 5 is turned on, and the driving motor 51 drives the driving gear 61 in the transmission box 6 to rotate through the reducer 52, and the driving gear 61 drives the spiral extrusion rod to rotate, and at the same time, the driving gear 61 drives the driven gear 63 through the transmission gear 62 The stirring shaft 41 and the stirring blade 42 are driven to rotate, thereby driving the stirring shaft 41 and the stirring blade 42 to rotate; the heating tube in the transmission tube 2 is turned on, and the raw materials of the shrink tube are added into the feed box 3. After the raw materials are mixed by the mixing mechanism 4, they move to the right end of the transmission tube 2 under the action of the spiral extrusion rod. During the movement, the raw materials are heated and melted by the heating tube, and the hot-melt raw materials are squeezed into the forming tube 7, and are extruded into a tube along the gap between the outer sleeve 11 and the inner sleeve 13. At the same time, cold water is continuously introduced into the cavity 15 through the connecting tube 17 to cool the shrink tube to form a tubular shrink tube.

[0035] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cold shrink tube forming device, characterized in that: include: A bottom frame (1), a transmission cylinder (2) is fixed in the middle of the top wall of the bottom frame (1), a spiral extrusion rod is rotatably mounted in the transmission cylinder (2), a heating tube is embedded in the transmission cylinder (2), a feed box (3) is fixedly connected to the left side of the top wall of the transmission cylinder (2), and a mixing mechanism (4) is installed in the feed box (3); A driving mechanism (5), the driving mechanism (5) being fixed to the left side of the top wall of the base frame (1), the driving mechanism (5) being connected to the spiral extrusion rod and the mixing mechanism (4) via a transmission box (6); A forming cylinder (7), wherein the forming cylinder (7) is fixed to the output end of the transmission cylinder (2) by means of a mounting flange (8) in cooperation with bolt fasteners; a center column (10) is fixed at the center of the inner cavity of the forming cylinder (7) via a connecting piece (9); a plurality of outer sleeves (11) are fixed to the inner wall of the forming cylinder (7) via a limiting mechanism (12); and a plurality of inner sleeves (13) are fixed to the outer wall of the center column (10) via a fixing mechanism (14).

2. A cold shrink tube forming device according to claim 1, characterized in that: The mixing mechanism (4) comprises two symmetrically arranged stirring shafts (41), the stirring shafts (41) being rotatably mounted between the inner walls of the feed box (3), and stirring blades (42) being staggeredly fixed on the two stirring shafts (41).

3. A cold shrink tube forming device according to claim 2, characterized in that: The transmission box (6) is fixed on the outer wall of the feed box (3), and a transmission mechanism is installed in the transmission box (6), and the transmission mechanism includes a driving gear (61) and two driven gears (63), the driving gear (61) is meshedly connected to any one of the driven gears (63) through a transmission gear (62), and one end of the spiral extrusion rod passes through the side wall of the transmission cylinder (2) through a bearing and is fixedly connected to the axis center position of the driving gear (61); The transmission gear (62) is rotatably mounted in the transmission box (6) via a gear shaft; The two driven gears (63) mesh with each other, and one end of the stirring shaft (41) passes through the side wall of the feed box (3) and the side wall of the transmission box (6) through a bearing and is fixedly connected to the axis center position of the corresponding driven gear (63).

4. A cold shrink tube forming device according to claim 3, characterized in that: The driving mechanism (5) comprises a driving motor (51) and a reducer (52), wherein the driving motor (51) is fixed above the reducer (52), and a power shaft of the driving motor (51) is fixedly connected to an input shaft of the reducer (52); The reducer (52) is fixed on the base frame (1); the output shaft of the reducer (52) passes through the side wall of the transmission box (6) through a bearing and is fixedly connected to the axis center position of the driving gear (61).

5. A cold shrink tube forming device according to claim 1, characterized in that: A cavity (15) is provided inside the molding cylinder (7), a spiral baffle (16) is fixed inside the cavity (15), and connecting pipes (17) communicating with the interior of the cavity (15) are fixed on both sides of the bottom wall of the molding cylinder (7).

6. A cold shrink tube forming device according to claim 1, characterized in that: The limiting mechanism (12) comprises a mounting shell (121), the mounting shell (121) being fixed to the right end of the outer wall of the forming cylinder (7), and one end of the mounting shell (121) being threadedly connected to a threaded knob (122) passing through it; A limit block (123) is rotatably mounted on one end of the threaded knob (122); The right end of the forming cylinder (7) is provided with a sliding groove (21) which cooperates with the limiting block (123); A limiting groove (19) matching with the limiting block (123) is formed at the right end of the outer sleeve (11).

7. A cold shrink tube forming device according to claim 1, characterized in that: The fixing mechanism (14) comprises a housing (141), the housing (141) being fixed to the right end of the central column (10), and a mounting sleeve (142) being rotatably mounted at the center of the housing (141); The mounting sleeve (142) is connected to the inner wall of the outer shell (141) via a torsion spring (143); one end of the mounting sleeve (142) passes through the side wall of the outer shell (141) via a bearing and fixes an anti-slip convex block; a mounting block (144) is provided on the outer sliding sleeve of the mounting sleeve (142); and a screw rod (147) is installed inside the mounting sleeve (142); Connecting rods (145) are rotatably mounted at the corners of the mounting blocks (144); An L-shaped limiting rod (146) is rotatably mounted on the other end of the connecting rod (145); One end of the L-shaped limiting rod (146) extends to the outside of the outer shell (141), and a limiting hole (20) matching with the L-shaped limiting rod (146) is formed at the right end of the inner sleeve (13); One end of the screw rod (147) is rotatably mounted on the inner wall of the housing (141), the other end of the screw rod (147) slides through the mounting sleeve (142) and is fixed with a knob (1410), and a screw block (148) is screwed onto the screw rod (147); The screw block (148) is fixedly connected to the mounting block (144) via a connecting plate (149).

8. A cold shrink tube forming device according to claim 7, characterized in that: The outer wall of the installation sleeve (142) is symmetrically provided with a plurality of limiting through slots (22), and the connecting plate (149) is slidably installed in the corresponding limiting through slots (22).

9. A cold shrink tube forming device according to claim 1, characterized in that: The left ends of the outer sleeve (11) and the inner sleeve (13) are both provided with a slot (18) that matches the connecting piece (9).

10. A method for using a cold shrink tube forming device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: adjusting the number of outer sleeves (11) and inner sleeves (13) according to the size of the shrink tube to be produced, and fixing the outer sleeve (11) to the inner wall of the forming tube (7) by means of a limiting mechanism (12), and fixing the inner sleeve (13) to the outer wall of the center column (10) by means of a fixing mechanism (14); Step 2: Turn on the driving motor (51) in the driving mechanism (5), and the driving motor (51) drives the driving gear (61) in the transmission box (6) to rotate through the speed reducer (52), and the driving gear (61) drives the spiral extrusion rod to rotate. At the same time, the driving gear (61) drives the driven gear (63) to rotate through the transmission gear (62), thereby driving the stirring shaft (41) and the stirring blade (42) to rotate; Step 3: Open the heating tube in the transmission tube (2) and add the raw materials of the shrink tube into the feed box (3). After the raw materials are mixed by the mixing mechanism (4), they move to the right end of the transmission tube (2) under the action of the spiral extrusion rod. During the movement, the raw materials are heated and melted by the heating tube. The hot-melted raw materials are squeezed into the forming tube (7) and extruded into a tube along the gap between the outer sleeve (11) and the inner sleeve (13). At the same time, cold water is continuously introduced into the cavity (15) through the connecting tube (17) to cool the shrink tube and form a tubular shrink tube.

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