Continuous lead extruding machine

Abstract

The invention discloses a continuous lead extruding machine, and relates to the technical field of lead extruding machines, the continuous lead extruding machine comprises a die holder body, a water cooling device is fixed on the die holder body through a sleeve, and the water cooling device comprises a front thread sleeve, a guide block, a pressing outer thread sleeve, a pressing inner thread sleeve, an elastic clamping mechanism, an outer cooling cylinder and an inner cooling cylinder; the outer cooling cylinder is fixed in the front threaded sleeve through the guide block, the pressing outer threaded sleeve and the pressing inner threaded sleeve, the inner cooling cylinder is arranged in the outer cooling cylinder in a sleeved mode, and the elastic clamping and fixing mechanism is arranged between the outer cooling cylinder and the inner cooling cylinder; the inner cooling cylinder has a clamping state and an unclamping state, the inner cooling cylinder is limited by the elastic clamping mechanism and cannot move in the clamping state, and the inner cooling cylinder can move in the axial direction in the unclamping state. According to the lead extruding machine, the cooling cylinders which are different in inner diameter and can be rapidly switched are adopted, cables of different specifications and thicknesses can be rapidly and conveniently cooled and solidified according to needs in actual use, and the problems that an existing lead extruding machine is low in utilization rate, the water cooling structure replacement process is complex, and the production efficiency is affected are solved.

Description

Technical Field

[0001] The invention relates to the technical field of lead extruders, in particular to a continuous lead extruder. Background Art

[0002] Continuous lead extruder is one of the equipments for producing wires and cables, and its function is to cover the cables with lead sheath. Fig.11 As shown, the continuous lead extruder usually includes a die base body 1, and the die base body 1 is usually provided with a lead extrusion device 2 composed of a front screw sleeve, a pressure equalizing ring, a flow guide core, a die cover, an adjustment die cover ring, an adjusting screw, etc. In addition, a water cooling structure 32 is fixed on the die base body 1. In actual use, the continuous lead extruder first coats the lead liquid evenly on the cable through the lead extrusion device 2, and then solidifies and shapes the coated lead sheath through the water cooling structure 32, so that the lead-coated cable can be obtained. Since the continuous lead extruder has the advantages of high efficiency and good quality of coating the lead sheath, it is widely used by various cable manufacturers.

[0003] Depend on Fig.11 It can be known that the existing water cooling structure 32 is usually a cooling jacket 33 with an interlayer water cavity fixed on the die base body, and a water spray hole 34 connected to the interlayer water cavity is set at the end of the cooling jacket 33. When the cable coated with the lead sheath is output from the lead extrusion device, water is sprayed to the cable through the water spray hole 34, so that the lead sheath can be quickly cooled and solidified. However, after careful analysis by the applicant, it was found that the existing continuous lead extruder can coat cables of different specifications with lead sheaths of different thicknesses by adjusting the position and spacing of each component in the lead extrusion device. However, its water cooling structure can only cool cables of a certain constant specification and constant lead sheath thickness. When it is necessary to produce cables of different specifications and different lead sheath thicknesses, either the continuous lead extruder needs to be replaced, or the water cooling structure needs to be replaced as a whole, resulting in the technical problems of low utilization rate of the continuous lead extruder, complicated replacement process, and influence on cable production efficiency. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned technical problems existing in the prior art, and to provide a continuous lead extruder. The lead extruder adopts cooling cylinders with different inner diameters and can be quickly switched. In actual use, cables with different specifications and lead sheath thicknesses can be quickly and conveniently cooled and solidified as needed, thereby solving the technical problems of low utilization rate of existing lead extruders, complicated process of replacing water cooling structure and affecting production efficiency.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows: A continuous lead extruder comprises a die base body, in which a lead extrusion device is fixed, a sleeve is fixed at the end of the die base body, and a water cooling device is fixed to the die base body through the sleeve. The water cooling device comprises a front screw sleeve, a guide block, a compression outer screw sleeve, a compression inner screw sleeve, an elastic clamping mechanism, an outer cooling cylinder and an inner cooling cylinder. The front end of the front screw sleeve is threadedly fixed in the sleeve, the guide block is fixed in the front screw sleeve by compression outer screw sleeve and compression inner screw sleeve, the outer cooling cylinder is fixed in the front screw sleeve by the guide block, the inner cooling cylinder is sleeved in the outer cooling cylinder, the outer cooling cylinder and the inner cooling cylinder are both provided with an interlayer water cavity, the front end of the outer cooling cylinder is fixed with an outer nozzle communicating with the interlayer water cavity, the front end of the inner cooling cylinder is fixed with an inner nozzle communicating with the interlayer water cavity, and the elastic clamping mechanism is arranged between the outer cooling cylinder and the inner cooling cylinder; the inner cooling cylinder has a clamping state and a release state which can be switched to each other by rotation, in the clamping state, the inner cooling cylinder is restricted by the elastic clamping mechanism and cannot move, and in the release state, the inner cooling cylinder can move axially.

[0006] The elastic clamping mechanism includes a small handwheel, a clamping ring, an elastic component and a locking block, the locking block is fixed to the outer surface of the rear part of the inner cooling cylinder; the small handwheel is fixed to the rear end of the outer cooling cylinder, the clamping ring is connected to the rear side of the small handwheel through multiple groups of elastic components, the inner diameter of the small handwheel is larger than the inner diameter of the outer cooling cylinder, the inner diameter of the clamping ring is between the outer diameter of the inner cooling cylinder and the inner diameter of the small handwheel, there is a clamping gap between the clamping ring and the small handwheel, the clamping ring is provided with a clearance notch for the locking block to pass through, and the locking block can move to the front side of the clamping ring through the clearance notch; in the clamped state, the locking block is misaligned with the clearance notch, the locking block is located in the clamping gap and is blocked by the clamping ring, and the inner cooling cylinder cannot move; in the released state, the locking block is located in the clearance notch, the locking block is out of the clamping gap, and the inner cooling cylinder can move axially.

[0007] The elastic component includes a positioning screw, a spacing nut, a gasket and a spring. The gasket and the spacing nut are respectively located on both sides of the clamping ring. The positioning screw passes through the gasket, the clamping ring and the spacing nut in sequence and is fixed on the small handwheel. The spring is sleeved on the positioning screw and is located between the gasket and the clamping ring. The clamping ring can be compressed by force to increase the clamping gap.

[0008] An expanded diameter section communicating with the clamping gap is provided inside the rear end of the outer cooling cylinder. The locking block includes a locking portion and a positioning portion respectively adapted to the clamping gap and the expanded diameter section. The locking portion is integrally formed at the rear end of the positioning portion and protrudes from the outer surface of the positioning portion. The elastic clamping mechanism fixes the inner cooling cylinder via the clamping ring and the locking portion.

[0009] The locking portion is provided with an insertion inclined surface for squeezing into the clamping gap and a clamping plane for cooperating with the clamping ring.

[0010] A positioning block is fixed on the outer surface of the rear part of the inner cooling cylinder, and a positioning notch matched with the positioning block is provided on the clamping ring, and the positioning block enters into the expanded diameter section through the positioning notch.

[0011] The number of the locking blocks and the number of the positioning blocks are both two, the two locking blocks and the two positioning blocks are symmetrically arranged, and the adjacent locking blocks and positioning blocks are distributed at 90 degrees.

[0012] After the inner cooling cylinder is fixed in the outer cooling cylinder, the outer nozzle of the outer cooling cylinder is blocked by the inner cooling cylinder.

[0013] The front screw sleeve is provided with a step, the compression outer screw sleeve is screwed on the rear end of the front screw sleeve, the compression inner screw sleeve is screwed in the compression outer screw sleeve, and the guide block is fixed on the step by the compression outer screw sleeve and the compression inner screw sleeve.

[0014] A large hand wheel is arranged at the rear end of the outer cooling cylinder, the middle part of the outer cooling cylinder is threadedly connected to the guide block, and the axial position of the outer cooling cylinder in the front screw sleeve is adjustable.

[0015] The advantages of adopting the present invention are: 1. The key improvement of the present invention is that an elastic clamping mechanism is provided between the inner cooling cylinder and the outer cooling cylinder with different inner diameters, so that the inner cooling cylinder can be quickly disassembled and installed by using the elastic clamping mechanism. In actual use, the inner cooling cylinder or the outer cooling cylinder can be easily and quickly switched to work, which is beneficial to cooling and curing cables with different specifications and lead sheath thicknesses. It not only improves the utilization rate and production efficiency of the continuous lead extruder, but also makes the replacement process of the cooling cylinder simpler and more convenient, more practical and more innovative.

[0016] 2. The elastic clamping mechanism adopted in the present invention has the advantages of simple structure, good clamping effect on the inner cooling cylinder, and convenient for quick disassembly and assembly of the inner cooling cylinder.

[0017] 3. The present invention can increase the contact area between the locking block and the inner cooling cylinder by providing a positioning portion on the locking block, which is not only beneficial to improving the stability and reliability of the locking block on the inner cooling cylinder, but also beneficial to improving the stability and reliability of the inner cooling cylinder fixed in the outer cooling cylinder.

[0018] 4. The present invention cooperates the locking plane with the squeeze-in inclined surface, so that the locking block can be rotated into the locking gap for locking with a relatively small force.

[0019] 5. The present invention cooperates with the positioning notch and the positioning block, which is conducive to accurately guiding the inner cooling cylinder into the outer cooling cylinder, and can use the positioning block to position the inner cooling cylinder, so that the inner cooling cylinder can keep the axial center line coincident with the outer cooling cylinder, which is conducive to improving the uniformity of cable cooling.

[0020] 6. The present invention can further improve the stability and reliability of the inner cooling cylinder after it is fixed by cooperating with two symmetrical locking blocks and two symmetrical positioning blocks.

[0021] 7. The present invention makes the disassembly and assembly of the outer cooling cylinder simpler and more convenient by means of a large hand wheel fixed on the outer cooling cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the planar structure of the present invention; Figure 2 for Figure 1 Schematic diagram of the enlarged structure at M in the middle; Figure 3 for Figure 1 A schematic diagram of a transverse cross-sectional structure; Figure 4 for Figure 1 Schematic diagram of the three-dimensional structure; Figure 5 It is a schematic diagram of the assembly structure of the water cooling device; Figure 6 It is a schematic diagram of a transverse cross-sectional structure in which an outer cooling cylinder and an inner cooling cylinder are fixed together; Figure 7 It is a schematic diagram of the transverse cross-sectional structure of the outer cooling cylinder; Figure 8 It is a schematic diagram of the transverse cross-sectional structure of the inner cooling cylinder; Fig. 9 for Figure 8 AA cross-sectional structural diagram; Fig.10 It is a schematic diagram of the three-dimensional structure of the inner cooling cylinder; Fig.11 It is a schematic diagram of the transverse cross-sectional structure of an existing continuous lead extruder.

[0023] Markings in the figure are: 1. die base body, 2. lead extrusion device, 3. sleeve, 4. front screw sleeve, 5. guide block, 6. clamping outer screw sleeve, 7. clamping inner screw sleeve, 8. elastic clamping mechanism, 9. outer cooling cylinder, 10. inner cooling cylinder, 11. interlayer water cavity, 12. outer nozzle, 13. inner nozzle, 14. small hand wheel, 15. clamping ring, 16. elastic component, 17. locking block, 18. clamping gap, 19. clearance gap, 20. water inlet pipe, 21. positioning screw, 22. spacing nut, 23. gasket, 24. spring, 25. locking part, 26. positioning part, 27. extrusion inclined surface, 28. clamping plane, 29. large hand wheel, 30. positioning gap, 31. positioning block, 32. water cooling structure, 33. cooling sleeve, 34. water spray hole. DETAILED DESCRIPTION

[0024] like Figure 1-10As shown, the present invention provides a continuous lead extruder, including a die base body 1, a lead extrusion device 2 is fixed in the die base body 1, a sleeve 3 is fixed at the rear end portion (the left end in the direction shown in the figure) of the die base body 1, a water cooling device is fixed to the die base body 1 through the sleeve 3, the water cooling device includes a front screw sleeve 4, a guide block 5, a clamping outer screw sleeve 6, a clamping inner screw sleeve 7, an elastic clamping mechanism 8, an outer cooling cylinder 9 and an inner cooling cylinder 10, the front end of the front screw sleeve 4 is threadedly fixed in the sleeve 3, a step is provided in the front screw sleeve 4, the clamping outer screw sleeve 6 is screwed to the rear end of the front screw sleeve 4, the clamping inner screw sleeve 7 is screwed to the clamping outer screw sleeve 6, and the guide block 5 is fixed at the step in the front screw sleeve 4 by the clamping outer screw sleeve 6 and the clamping inner screw sleeve 7. The outer cooling cylinder 9 is fixed in the front screw sleeve 4 through the guide block 5. The middle part of the outer cooling cylinder 9 is threadedly connected to the guide block 5. A large handwheel 29 is fixed to the rear end of the outer cooling cylinder 9. The rotation of the outer cooling cylinder 9 is controlled by the large handwheel 29, so that the outer cooling cylinder 9 can be moved axially in the front screw sleeve 4, so that the axial position of the outer cooling cylinder 9 in the front screw sleeve 4 can be adjusted.

[0025] The inner cooling cylinder 10 is sleeved in the outer cooling cylinder 9, and the rear end of the inner cooling cylinder 10 is located outside the outer cooling cylinder 9, and the inner cooling cylinder 10 can rotate in the outer cooling cylinder 9 without external force constraints. The outer cooling cylinder 9 and the inner cooling cylinder 10 are both provided with an interlayer water cavity 11, and the rear ends of the outer cooling cylinder 9 and the inner cooling cylinder 10 are respectively fixed with water inlet pipes 20 communicating with the interlayer water cavity 11, and the front end of the outer cooling cylinder 9 is fixed with an outer nozzle 12 communicating with the interlayer water cavity 11, and the front end of the inner cooling cylinder 10 is fixed with an inner nozzle 13 communicating with the interlayer water cavity 11, and both the outer nozzle 12 and the inner nozzle 13 face the cable to be cooled.

[0026] The elastic clamping mechanism 8 is arranged between the outer cooling cylinder 9 and the inner cooling cylinder 10, and the inner cooling cylinder 10 is installed in the outer cooling cylinder 9 through the elastic clamping mechanism 8. Based on the elastic clamping mechanism 8, the inner cooling cylinder 10 has a clamping state and an unlocking state that can be switched to each other by rotation, that is, the inner cooling cylinder 10 is rotated in the clamping state, and the inner cooling cylinder 10 is switched to the unlocking state, and the inner cooling cylinder 10 is rotated in the unlocking state, and the inner cooling cylinder 10 is switched to the clamping state. In the clamping state, the inner cooling cylinder 10 is restricted by the elastic clamping mechanism 8 and cannot move, and in the unlocking state, the inner cooling cylinder 10 can move axially.

[0027] It should be noted that when the inner cooling cylinder 10 is fixed in the outer cooling cylinder 9 , the outer nozzle 12 of the outer cooling cylinder 9 is blocked by the inner cooling cylinder 10 .

[0028] When it is necessary to produce cables with smaller specifications and / or thinner lead sheaths, the inner cooling cylinder 10 and the inner nozzle 13 can be used to spray water on the cables for cooling and solidification. When it is necessary to produce cables with larger specifications and / or thicker lead sheaths, the inner cooling cylinder 10 is first controlled to rotate so that the inner cooling cylinder 10 is switched from a locked state to an unlocked state. At this time, the inner cooling cylinder 10 can move axially in the outer cooling cylinder 9, and the inner cooling cylinder 10 can be pulled out backward (left) to switch to the outer cooling cylinder 9. The entire switching process only requires rotating the inner cooling cylinder 10, which is simpler and more convenient to operate.

[0029] In a specific embodiment, Figure 1-6 As shown in 8-10, the elastic clamping mechanism 8 includes a small hand wheel 14, a clamping ring 15, an elastic component 16 and a locking block 17. Among them, the locking block 17 is fixed on the outer surface of the rear part of the inner cooling cylinder 10, the small hand wheel 14 is fixed on the rear end face of the outer cooling cylinder 9, the number of elastic components 16 is multiple groups, and the number of elastic components 16 in this embodiment is 3 groups and they are evenly arranged, the clamping ring 15 is connected to the rear side of the small hand wheel 14 through multiple groups of elastic components 16, the inner diameter of the small hand wheel 14 is larger than the inner diameter of the outer cooling cylinder 9, the inner diameter of the clamping ring 15 is between the outer diameter of the inner cooling cylinder 10 and the inner diameter of the small hand wheel 14, there is a clamping gap 18 between the clamping ring 15 and the small hand wheel 14, and a clearance gap 19 is provided on the clamping ring 15 for the locking block 17 to pass through, and the locking block 17 can move to the front side of the clamping ring 15 through the clearance gap 19. When the clamping ring 15 is subjected to a backward (leftward) force, the elastic component 16 can be compressed, thereby increasing the clamping gap 18 and facilitating the locking block 17 to enter the clamping gap 18 .

[0030] When the inner cooling cylinder 10 is in the clamping state, the locking block 17 is misaligned with the clearance gap 19, the locking block 17 is located in the clamping gap 18 and is blocked by the clamping ring 15, and the inner cooling cylinder 10 cannot move. At this time, the inner cooling cylinder 10 can be used to cool cables with smaller specifications and / or thinner lead sheaths. When the inner cooling cylinder 10 is in the unlocking state, the locking block 17 is located in the clearance gap 19, the locking block 17 is separated from the clamping gap 18, and the inner cooling cylinder 10 can move axially. At this time, the inner cooling cylinder 10 can be pulled out of the outer cooling cylinder 9, and then the outer cooling cylinder 9 can be used to cool cables with larger specifications and / or thicker lead sheaths.

[0031] In this embodiment, if Figure 1-5As shown, the elastic component 16 includes a positioning screw 21, a spacing nut 22, a gasket 23 and a spring 24. Positioning holes are respectively provided on the clamping ring 15. The gaskets 23 and spacing nuts 22 in each group of elastic components 16 are respectively located on both sides of the clamping ring 15. The positioning screw 21 in each group of elastic components 16 passes through the gasket 23, the positioning hole on the clamping ring 15 and the spacing nut 22 in sequence and is fixed on the small hand wheel 14. The spring 24 is sleeved on the positioning screw 21 and is located between the gasket 23 and the clamping ring 15. Under the action of the spring 24, the clamping ring 15 is always located on the side close to the spacing nut 22. When the clamping ring 15 is subjected to a backward force, the clamping ring 15 will compress the spring 24 and increase the clamping gap 18 to facilitate the entry of the locking block 17, making the disassembly and assembly of the cooling cylinder simpler and more convenient.

[0032] It should be noted that if Figure 2-4 As shown, a through hole is also provided on the clamping ring 15 , and the water inlet pipe 20 on the outer cooling cylinder 9 can pass through the clamping ring 15 through the through hole, and the water inlet pipe 20 on the inner cooling cylinder 10 can be perpendicular to the inner cooling cylinder 10 .

[0033] In a specific embodiment, Figure 7 , 10 As shown, the rear end of the outer cooling cylinder 9 is provided with an expanded diameter section communicating with the clamping gap 18, and the inner diameter of the expanded diameter section is also smaller than the inner diameter of the small hand wheel 14. Correspondingly, the locking block 17 includes a locking portion 25 respectively adapted to the clamping gap 18 and a positioning portion 26 adapted to the expanded diameter section. The locking block 17 is welded and fixed to the inner cooling cylinder 10 through the positioning portion 26. The locking portion 25 is integrally formed at the rear end of the positioning portion 26 and protrudes from the outer surface of the positioning portion 26. The elastic clamping mechanism 8 enters the clamping gap 18 through the locking portion 25 and is blocked by the clamping ring 15 to fix the inner cooling cylinder 10, thereby improving the stability and reliability of the inner cooling cylinder 10 fixed in the outer cooling cylinder 9.

[0034] In this embodiment, if Fig.10 As shown, the locking portion 25 is provided with an insertion slope 27 for squeezing into the clamping gap 18 and a clamping plane 28 for cooperating with the clamping ring 15. When controlling the rotation of the inner cooling cylinder 10, the insertion slope 27 enters the clamping gap 18 before the clamping plane 28, so that the state switching of the inner cooling cylinder 10 is smoother and saves time and effort.

[0035] In a specific embodiment, Figure 5 As shown, a positioning block 31 is fixed to the outer surface of the rear part of the inner cooling cylinder 10, and a positioning notch 30 matching the positioning block 31 is provided on the clamping ring 15. During installation, the positioning block 31 can enter the expanded diameter section through the positioning notch 30.

[0036] Further, such as Figure 5-6As shown in , 8-10, there are two locking blocks 17 and two positioning blocks 31, which are symmetrically arranged, and the adjacent locking blocks 17 and positioning blocks 31 are arranged at 90 degrees. In this way, the axis of the inner cooling cylinder 10 and the outer cooling cylinder 9 can be kept coincident, thereby further improving the stability and reliability of the inner cooling cylinder 10 after being fixed and the cooling effect on the cable.

[0037] The working principle of the present invention is: In the initial state, the inner cooling cylinder 10 is in a clamped state, the locking block 17 is misaligned with the clearance gap 19, the locking block 17 is located in the clamping gap 18 and is blocked by the clamping ring 15, and the inner cooling cylinder 10 cannot move in the outer cooling cylinder 9. At this time, it is suitable for producing cables with smaller specifications and / or thinner lead sheaths. During production, no water enters the outer cooling cylinder 9, only the inner cooling cylinder 10 enters water, so that the inner cooling cylinder 10 and the inner nozzle 13 cooperate to spray water on the cable for cooling and curing.

[0038] When it is necessary to produce cables with larger specifications and / or thicker lead sheaths, first control the inner cooling cylinder 10 to rotate so that the inner cooling cylinder 10 switches from the locked state to the unlocked state. At this time, the locking block 17 is located in the clearance gap 19, and the locking block 17 is out of the locking gap 18. The inner cooling cylinder 10 can move axially, and the inner cooling cylinder 10 can be pulled out of the outer cooling cylinder 9 by applying force backward, and then switch to using the outer cooling cylinder 9 to cool cables with larger specifications and / or thicker lead sheaths.

[0039] In summary, the present invention can utilize the elastic clamping mechanism 8 to quickly realize the disassembly and installation of the inner cooling cylinder 10. In actual use, it can conveniently and quickly switch to use the inner cooling cylinder 10 or the outer cooling cylinder 9, which is beneficial to cooling and solidifying cables of different specifications and lead sheath thicknesses. It not only improves the utilization rate and production efficiency of the continuous lead extruder, but also makes the replacement process of the cooling cylinder simpler, more convenient, more practical, and more innovative.

[0040] The above description is only a specific implementation mode of the present invention. Any feature disclosed in this specification, unless otherwise stated, can be replaced by other alternative features that are equivalent or have similar purposes; all the disclosed features, or all the steps in the methods or processes, except for mutually exclusive features and / or steps, can be combined in any way.

Claims

1. A continuous lead extruder, comprising a die base body (1), a lead extrusion device (2) being fixed inside the die base body (1), a sleeve (3) being fixed at the end of the die base body (1), and a water cooling device being fixed to the die base body (1) through the sleeve (3), characterized in that: The water cooling device comprises a front screw sleeve (4), a guide block (5), a compression outer screw sleeve (6), a compression inner screw sleeve (7), an elastic clamping mechanism (8), an outer cooling tube (9) and an inner cooling tube (10); the front end of the front screw sleeve (4) is threadedly fixed in the sleeve (3); the guide block (5) is fixed in the front screw sleeve (4) by means of the compression outer screw sleeve (6) and the compression inner screw sleeve (7); the outer cooling tube (9) is fixed in the front screw sleeve (4) by means of the guide block (5); the inner cooling tube (10) is sleeved in the outer cooling tube (9); and both the outer cooling tube (9) and the inner cooling tube (10) are provided with a clamping member. The outer cooling tube (9) is provided with an outer nozzle (12) in communication with the interlayer water cavity (11), the front end of the outer cooling tube (9) is fixed with an inner nozzle (13) in communication with the interlayer water cavity (11), the front end of the inner cooling tube (10) is fixed with an inner nozzle (13) in communication with the interlayer water cavity (11), and an elastic clamping mechanism (8) is arranged between the outer cooling tube (9) and the inner cooling tube (10); the inner cooling tube (10) has a clamping state and an unlocking state which can be switched with each other by rotation, in the clamping state, the inner cooling tube (10) is restricted by the elastic clamping mechanism (8) and cannot move, and in the unlocking state, the inner cooling tube (10) can move axially.

2. The continuous lead extruder according to claim 1, characterized in that: The elastic clamping mechanism (8) comprises a small hand wheel (14), a clamping ring (15), an elastic component (16) and a locking block (17); the locking block (17) is fixed to the outer surface of the rear part of the inner cooling cylinder (10); the small hand wheel (14) is fixed to the rear end of the outer cooling cylinder (9); the clamping ring (15) is connected to the rear side of the small hand wheel (14) through multiple sets of elastic components (16); the inner diameter of the small hand wheel (14) is larger than the inner diameter of the outer cooling cylinder (9); the inner diameter of the clamping ring (15) is between the outer diameter of the inner cooling cylinder (10) and the inner diameter of the small hand wheel (14); the clamping ring (15) and the small hand wheel (10) are connected to each other. 4), a locking gap (18) is provided between the locking block (17) and the inner cooling tube (10), and a clearance notch (19) is provided on the locking ring (15) for the locking block (17) to pass through. The locking block (17) can move to the front side of the locking ring (15) through the clearance notch (19); in the locked state, the locking block (17) and the clearance notch (19) are misaligned, the locking block (17) is located in the locking gap (18) and is blocked by the locking ring (15), and the inner cooling tube (10) cannot move; in the unlocked state, the locking block (17) is located in the clearance notch (19), the locking block (17) is separated from the locking gap (18), and the inner cooling tube (10) can move axially.

3. The continuous lead extruder according to claim 2, characterized in that: The elastic component (16) comprises a positioning screw (21), a spacing nut (22), a gasket (23) and a spring (24); the gasket (23) and the spacing nut (22) are respectively located on both sides of the clamping ring (15); the positioning screw (21) passes through the gasket (23), the clamping ring (15) and the spacing nut (22) in sequence and is then fixed on the small hand wheel (14); the spring (24) is sleeved on the positioning screw (21) and is located between the gasket (23) and the clamping ring (15); the clamping ring (15) is subjected to force to compress the elasticity and increase the clamping gap (18).

4. The continuous lead extruder according to claim 2, characterized in that: The rear end of the outer cooling cylinder (9) is provided with an expanded diameter section communicating with the clamping gap (18), the locking block (17) comprises a locking portion (25) and a positioning portion (26) respectively adapted to the clamping gap (18) and the expanded diameter section, the locking portion (25) being integrally formed at the rear end of the positioning portion (26) and protruding from the outer surface of the positioning portion (26), and the elastic clamping mechanism (8) fixes the inner cooling cylinder (10) via the clamping ring (15) and the locking portion (25).

5. The continuous lead extruder according to claim 4, characterized in that: The locking portion (25) is provided with an insertion inclined surface (27) for inserting into the clamping gap (18) and a clamping plane (28) for cooperating with the clamping ring (15).

6. The continuous lead extruder according to any one of claims 2 to 5, characterized in that: The clamping ring (15) is provided with a positioning notch (30), and the outer surface of the rear portion of the inner cooling cylinder (10) is provided with a positioning block (31) adapted to the positioning notch (30), and the positioning block (31) enters the expanded diameter section through the positioning notch (30).

7. The continuous lead extruder according to claim 6, characterized in that: The number of the locking blocks (17) and the number of the positioning blocks (31) are both two, the two locking blocks (17) and the two positioning blocks (31) are symmetrically arranged, and adjacent locking blocks (17) and positioning blocks (31) are arranged at 90 degrees.

8. The continuous lead extruder according to claim 1, characterized in that: After the inner cooling cylinder (10) is fixed inside the outer cooling cylinder (9), the outer nozzle (12) of the outer cooling cylinder (9) is blocked by the inner cooling cylinder (10).

9. The continuous lead extruder according to claim 1, characterized in that: The front screw sleeve (4) is provided with a step, the compression outer screw sleeve (6) is screwed to the rear end of the front screw sleeve (4), the compression inner screw sleeve (7) is screwed to the compression outer screw sleeve (6), and the guide block (5) is fixed at the step by the compression outer screw sleeve (6) and the compression inner screw sleeve (7).

10. The continuous lead extruder according to claim 1, characterized in that: A large hand wheel (29) is provided at the rear end of the outer cooling cylinder (9), a middle portion of the outer cooling cylinder (9) is threadedly connected to the guide block (5), and the axial position of the outer cooling cylinder (9) in the front screw sleeve (4) is adjustable.

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