Method for manufacturing a cable protection pipe and manufacturing line therefor

Abstract

The application discloses a cable protection pipe preparation method and a preparation production line thereof, and the preparation method comprises the following steps: step 1, linearly conveying the extrusion-formed cable protection pipe along the extrusion direction thereof; step 2, extruding from the outside to the inside along the radial direction of the cable protection pipe, so that recessed parts arranged at equal angles around the axis of the cable protection pipe are formed on the cable protection pipe, and limiting channels for the cables to pass through are formed between the adjacent recessed parts; step 3, cooling and shaping the extruded cable protection pipe; and step 4, cutting the cooled and shaped cable protection pipe, and performing negative pressure grabbing limiting on both sides of the cutting position in the cutting process. The application guarantees the normal manufacturing efficiency of the cable protection pipe, and also enables the cable protection pipe to have the function of orderly and separately arranging the cables in the cable protection pipe, and guarantees the manufacturing quality of the cable protection pipe.

Description

Technical Field

[0001] This invention relates to the field of cable protection pipe manufacturing, and more specifically to a method for manufacturing cable protection pipes and its manufacturing production line. Background Technology

[0002] Cable protection pipe is a type of conduit used to protect cables from external environmental influences and mechanical damage. Its manufacturing process mainly involves using an extruder to extrude molten raw materials through a die into cable protection pipes of a certain specification and thickness. The extruded cable protection pipes are then cooled to gradually solidify before being cut into pipe sections of appropriate length.

[0003] Most existing cable protection pipes are tubular. Since multiple cables are often inserted into the cable protection pipe during use, there is a possibility that the cables inside may come into contact with each other. This poses a significant safety hazard if the cable sheath is damaged. In addition, the intertwined cables inside the cable protection pipe increase the difficulty of removing specific cables, thus affecting the efficiency of cable repair and replacement. Summary of the Invention

[0004] The purpose of this invention is to provide a method for preparing cable protection pipes and a production line thereof. This method and production line ensure the normal manufacturing efficiency of cable protection pipes while also enabling the cable protection pipes to have the function of orderly separating and placing the cables inside, and ensuring the manufacturing quality of the cable protection pipes.

[0005] The technical solution adopted by the present invention to solve the above problems is:

[0006] A method for preparing a cable protection pipe includes the following steps:

[0007] Step 1: Convey the extruded cable protection tube in a straight line along its extrusion direction;

[0008] Step 2: Press from the outside to the inside along the radial direction of the cable protection tube, so that the cable protection tube has recesses arranged at equal angles around its central axis, and a limiting channel for the cable to pass through is formed between adjacent recesses.

[0009] Step 3: Cool and shape the extruded cable protection tube;

[0010] Step 4: Cut the cooled and shaped cable protection tube, and apply negative pressure to both sides of the cutting position to limit the movement during the cutting process;

[0011] Step 5: Remove the cut and separated cable protection pipe from the straight conveying track of the cable protection pipe and recycle it.

[0012] As a further improvement to the above technical solution, in step 2, the direction of squeezing the cable protection pipe is on the same vertical plane.

[0013] As a further improvement to the above technical solution, in step 2, during the process of the cable protection pipe being squeezed from the outside to the inside, the adjacent squeezing positions on the cable protection pipe are supported from the inside to the outside along its radial direction, and the support direction is on the same vertical plane as the squeezing direction.

[0014] As a further improvement to the above technical solution, the maximum outer diameter of the compressed position on the cable protection pipe is smaller than the inner diameter of the uncompressed position.

[0015] As a further improvement to the above technical solution, in step 4, the cutting trajectory is circular, the cutting device moves together with the cable protection pipe, and resets after the cutting is completed.

[0016] The present invention also provides a production line for manufacturing cable protection pipes based on the above-described technical solution, comprising:

[0017] The extrusion station uses an extruder to extrude cable protection tubes into tubular shapes, which are then transported in a straight line.

[0018] The extrusion station uses an extrusion mechanism to extrude the cable protection tube and form several recesses arranged at equal angles around the central axis of the cable protection tube, so that a limiting channel for the cable to pass through is formed between adjacent recesses.

[0019] The cooling station uses a water-cooling pool to cool and shape the cable protection pipe;

[0020] The cutting station uses a limiting mechanism to limit the cutting position on both sides of the cable protection pipe, and the cutting mechanism performs a circumferential cut on the cutting position of the cable protection pipe.

[0021] The transfer station uses a transfer mechanism to move the cut and separated cable protection pipes away from the straight transport track of the cable protection pipes.

[0022] As a further improvement to the above technical solution, both the extrusion mechanism and the limiting mechanism include an adjustment unit. The adjustment unit includes a seat and a rotating ring. The seat of the extrusion mechanism is detachably mounted on the machine body. The seat of the limiting mechanism is slidably mounted on the machine body, and a first linear drive device for driving the seat to slide horizontally relative to the machine body is mounted on the machine body. The rotating ring is rotatably mounted on the seat, and a first drive motor for driving the rotating ring to rotate relative to the seat is mounted on the seat. The first drive motor and the rotating ring are connected by a worm gear transmission mechanism and a gear transmission mechanism in sequence. Several drive seats are slidably mounted on the seat along the radial direction of the rotating ring. Each drive seat is arranged at an equal angle around the central axis of the rotating ring. The drive seats and the rotating ring are connected by a gear transmission mechanism and a gear and rack transmission mechanism in sequence.

[0023] As a further improvement to the above technical solution, the extrusion mechanism also includes several extrusion heads, each corresponding to a drive seat. The extrusion head is detachably mounted on the inner end of the drive seat. The inner end of the extrusion head and the end faces of both ends of the inner end are arc-shaped. An extension seat is detachably mounted on the extrusion end of the extruder. The extension seat can be inserted into the cable protection tube formed by the extruder. A support seat is provided between adjacent drive seats. Each support seat is arranged at an equal angle around the central axis of the extension seat and the support seat and the extension seat are parallel. A push seat is slidably mounted on the extension seat along its axial direction. A second linear drive device for driving the push seat to slide horizontally is installed on the extension seat. The support seat and the push seat are connected by two parallel hinge rods. One end of the hinge rod is hinged to the support seat, and the other end of the hinge rod is hinged and slidably mounted on the push seat. The two ends of the hinge rod are hinged to the extension seat.

[0024] As a further improvement to the above technical solution, the limiting mechanism has two adjustment units and also includes several rollers. A first sliding seat is slidably arranged on the drive seat. A spring is provided between the first sliding seat and the drive seat, with the two ends of the spring abutting against the first sliding seat and the drive seat respectively. The rollers are rotatably arranged on the first sliding seat. A limiting seat is provided between adjacent drive seats. The limiting seat is slidably arranged on the seat body along the radial direction of the rotating ring. The limiting seat and the rotating ring are connected by a gear transmission mechanism and a gear and rack transmission mechanism in sequence. A negative pressure suction cup is detachably installed on the limiting seat. The negative pressure suction cup uses a negative pressure device to adsorb the cable protection tube.

[0025] As a further improvement to the above technical solution, the cutting mechanism is located between two adjustment units. The cutting mechanism includes a cutting seat with a groove on the seat body. The groove is annular, and the center of the groove and the rotating ring are on the same straight line. The cutting seat is slidably disposed in the groove. Two drive wheels are rotatably disposed on the cutting seat. The two drive wheels are symmetrically arranged on the left and right sides relative to the cutting seat. A second drive motor for driving either drive wheel to rotate is installed on the cutting seat. The two drive wheels are connected by a synchronous belt transmission mechanism. A second sliding seat is slidably disposed on the cutting seat and a third linear drive device for driving the second sliding seat to move is installed. A cutting saw blade is rotatably disposed on the second sliding seat and a third drive motor for driving the cutting saw blade to rotate is installed.

[0026] Compared with the prior art, the present invention has the following advantages and effects:

[0027] (1) The present invention guides the extrusion deformation of the cable protection tube to achieve the effect of forming a recess on the cable protection tube, so that a limiting channel for the cable inside can be formed inside the cable protection tube. This ensures the normal manufacturing efficiency of the cable protection tube while also enabling the cable protection tube to separate the cables inside in an orderly manner, reducing the safety risks caused by the entanglement between the cables inside the cable protection tube and greatly improving the convenience of cable maintenance.

[0028] (2) By limiting the cable protection pipe during the cutting and separation of the cable protection pipe, the present invention ensures the flatness of the cut surface of the cable protection pipe and reduces the risk of damage to the cable protection pipe caused by the cutting operation, thereby ensuring the manufacturing quality of the cable protection pipe. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a cable protection pipe preparation method according to Embodiment 1.

[0030] Figure 2 This is a schematic diagram of the structure of a cable protection pipe manufacturing production line in Example 2.

[0031] Figure 3 yes Figure 2 The diagram shows a partial structural schematic of the machine body shown.

[0032] Figure 4 yes Figure 3 The diagram shows a cross-sectional view of the extrusion mechanism.

[0033] Figure 5 yes Figure 3 The second cross-sectional view of the extrusion mechanism shown is a schematic diagram.

[0034] Figure 6 yes Figure 3The diagram shows a cross-sectional view of the extrusion mechanism.

[0035] Figure 7 yes Figure 3 The diagram shows a partial structural schematic of the extrusion mechanism in the extrusion state.

[0036] Figure 8 yes Figure 3 The extrusion mechanism shown in the diagram is a cross-sectional view of section four.

[0037] Figure 9 yes Figure 2 The diagram shows a partial structural schematic of the machine body shown.

[0038] Figure 10 yes Figure 9 The diagram shows a cross-sectional view of the limiting mechanism shown.

[0039] Figure 11 yes Figure 9 The second cross-sectional view of the limiting mechanism shown is a structural schematic diagram.

[0040] Figure 12 yes Figure 9 The diagram shows a cross-sectional view of the limiting mechanism shown in Figure 3.

[0041] Figure 13 yes Figure 9 The diagram shows the structure of the limiting mechanism in its limiting state.

[0042] Figure 14 yes Figure 13 The diagram shows a partial structural schematic of the drive seat on the limiting mechanism shown.

[0043] Figure 15 yes Figure 9 The diagram shows the structure between the two adjustment units.

[0044] Figure 16 yes Figure 15 The diagram shows the structure of the cutting mechanism.

[0045] Figure 17 yes Figure 2 The diagram shows a partial structural diagram of the machine body shown.

[0046] The components include: machine body 1, extrusion station 11, extrusion station 12, cooling station 13, cutting station 14, transfer station 15, extruder 16, water cooling tank 17, extrusion mechanism 2, extrusion head 21, arc-shaped part 22, extension seat 23, support seat 24, push seat 25, second linear drive device 26, hinge rod 27, limiting mechanism 3, roller 31, first sliding seat 32, spring 33, limiting seat 34, negative pressure suction cup 35, negative pressure device 36, cutting mechanism 4, cutting seat 41, slide 42, drive wheel 43, and second drive motor. 44, second sliding seat; 45, third linear drive device; 46, cutting saw blade; 47, third drive motor; 48, transfer mechanism; 5, rotating seat; 51, fourth drive motor; 52, receiving groove; 53, conveying wheel; 54, fifth drive motor; 55, adjusting unit; 6, seat body; 61, rotating ring; 62, first linear drive device; 63, first drive motor; 64, drive seat; 65, worm gear transmission mechanism; 71, gear transmission mechanism; 72, gear and rack transmission mechanism; 73, cable protection tube; 8, recessed part; 81, limiting channel; 82, protrusion; 83. Detailed Implementation

[0047] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0048] Example 1.

[0049] See Figure 1 This embodiment describes a method for preparing a cable protection pipe, which includes the following steps:

[0050] Step 1: Convey the extruded cable protection tube in a straight line along its extrusion direction;

[0051] Step 2: Press from the outside to the inside along the radial direction of the cable protection tube, so that the cable protection tube has recesses arranged at equal angles around its central axis, and a limiting channel for the cable to pass through is formed between adjacent recesses.

[0052] Step 3: Cool and shape the extruded cable protection tube;

[0053] Step 4: Cut the cooled and shaped cable protection tube, and apply negative pressure to both sides of the cutting position to limit the movement during the cutting process;

[0054] Step 5: Remove the cut and separated cable protection pipe from the straight conveying track of the cable protection pipe and recycle it.

[0055] In this embodiment, in step 2, the direction of extruding the cable protection pipe is on the same vertical plane, which ensures the stability of the cable protection pipe deformation.

[0056] In this embodiment, in step 2, during the process of the cable protection pipe being squeezed from the outside to the inside, the adjacent squeezing positions on the cable protection pipe are supported from the inside to the outside along its radial direction, and the support direction is on the same vertical plane as the squeezing direction. This can play a certain role in limiting the deformation of the cable protection pipe, reducing the risk of excessive deformation of the cable protection pipe, and thus ensuring the accuracy of the deformation state of the cable protection pipe under the squeezing action.

[0057] In this embodiment, the maximum outer diameter of the compressed portion of the cable protection tube is smaller than the inner diameter of the uncompressed portion, allowing the compressed cable protection tube and the uncompressed cable protection tube to be connected by plugging.

[0058] In this embodiment, in step 4, the cutting trajectory is circular, the cutting device moves together with the cable protection pipe, and resets after cutting, so as to achieve the purpose of cutting operation during the continuous linear conveying of the cable protection pipe.

[0059] Example 2.

[0060] See Figures 2-15 This embodiment describes a production line based on the cable protection tube preparation method described in Embodiment 1. The production line includes a machine body 1, which is sequentially equipped with an extrusion station 11, a pressing station 12, a cooling station 13, a cutting station 14, and a transport station 15. The extrusion station 11 uses an extruder 16 to extrude a tubular cable protection tube, which is then transported linearly. The pressing station 12 uses an extrusion mechanism 2 to press the cable protection tube, forming several recesses arranged at equal angles around the central axis of the cable protection tube, creating a limiting channel between adjacent recesses for cable passage. The cooling station 13 uses a water-cooling tank 17 to cool and shape the cable protection tube. The cutting station 14 uses a limiting mechanism 3 to limit the cutting positions on both sides of the cable protection tube, and a cutting mechanism 4 to perform circumferential cutting on the cutting positions. The transport station 15 uses a transfer mechanism 5 to move the cut cable protection tube away from the linear transport trajectory of the cable protection tube.

[0061] See Figures 3-12Both the extrusion mechanism 2 and the limiting mechanism 3 include an adjustment unit 6. The adjustment unit 6 includes a seat 61 and a rotating ring 62. The seat 61 of the extrusion mechanism 2 is detachably mounted on the machine body 1. The seat 61 of the limiting mechanism 3 is slidably mounted on the machine body 1, and a first linear drive device 63 for driving the seat 65 to slide horizontally relative to the machine body 1 is mounted on the machine body 1. The rotating ring 62 is rotatably mounted on the seat 61. A first drive motor 64 for driving the rotating ring 62 to rotate relative to the seat 61 is mounted on the seat 61. The first drive motor 64 and the rotating ring 62 are connected by a worm gear transmission mechanism and a gear transmission mechanism in sequence. Several drive seats 65 are slidably mounted on the seat 61 along the radial direction of the rotating ring 62. Each drive seat 65 is arranged at an equal angle around the central axis of the rotating ring 62. The drive seats 65 and the rotating ring 62 are connected by a gear transmission mechanism and a gear and rack transmission mechanism in sequence.

[0062] In use, the first drive motor 64 drives the rotating ring 62, causing the drive seat 65 to slide relative to the seat body 61. This allows for adjustment of the space formed by the surrounding drive seats 65, enabling the extrusion mechanism 2 and the limiting mechanism 3 to be suitable for preparing cable protection pipes of different diameters and to form recesses of different degrees, thus improving the applicability of the equipment. Simultaneously, the self-locking effect of the worm gear transmission mechanism ensures the stability of the drive seat 65 after movement, guaranteeing the quality of the cable protection pipe preparation.

[0063] See Figures 4-8 The extrusion mechanism 2 further includes several extrusion heads 21, each corresponding to a drive seat 65. The extrusion heads 21 are detachably mounted on the inner end of the drive seat 65. The inner end and both ends of the extrusion heads 21 are arc-shaped 22, which ensures smooth extrusion operation while also improving the aesthetics of the recessed portion. An extension seat 23 is detachably mounted on the extrusion end of the extruder 16. The extension seat 23 can be inserted into the cable protection tube extruded by the extruder 16. Support seats 24 are provided between adjacent drive seats 65. The support base 24 and the extension base 23 are arranged at equal angles around the central axis of the extension base 23 and are parallel to each other. A push base 25 is slidably arranged on the extension base 23 along its axial direction. A second linear drive device 26 for driving the push base 25 to slide horizontally is installed on the extension base 23. The support base 24 and the push base 25 are connected by two parallel hinge rods 27. One end of the hinge rod 27 is hinged to the support base 24, and the other end of the hinge rod 27 is hinged to and slidably arranged on the push base 25. The two ends of the hinge rod 27 are hinged to the extension base 23.

[0064] In use, the extrusion head 21 is pressed against the cable protection tube by the movement of the drive seat 65 and extruded radially inward along the cable protection tube. Combined with the linear conveying of the cable protection tube, a recess is formed on the cable protection tube, and the cable protection tube can also achieve a certain degree of narrowing under the extrusion action.

[0065] During the extrusion operation of the cable protection pipe, the second linear drive device 26 drives the push seat 25, causing the push seat 25 to push the hinge rod 27 to rotate, thereby adjusting the distance between the support seat 24 and the extension seat 23. This achieves the purpose of supporting the protrusion between adjacent recesses on the cable protection pipe by the support seat 24, while also limiting the deformation of the cable protection pipe to a certain extent, thus ensuring the processing effect of the cable protection pipe.

[0066] See Figures 9-14 The limiting mechanism 3 has two adjustment units 6. The limiting mechanism 3 also includes several rollers 31. A first sliding seat 32 is slidably arranged on the drive seat 65. A spring 33 is provided between the first sliding seat 32 and the drive seat 65. The two ends of the spring 33 abut against the first sliding seat 32 and the drive seat 65 respectively. The rollers 31 are rotatably arranged on the first sliding seat 32. A limiting seat 34 is provided between adjacent drive seats 65. The limiting seat 34 is slidably arranged on the seat body 61 along the radial direction of the rotating ring 62. The limiting seat 34 and the rotating ring 62 are connected by a gear transmission mechanism and a gear and rack transmission mechanism in sequence. A negative pressure suction cup 35 is detachably installed on the limiting seat 34. The negative pressure suction cup 35 is used to adsorb the cable protection tube through a negative pressure device 36.

[0067] To ensure the limiting effect of the limiting mechanism 3 on the cable protection pipe, the rotating rings 62 in the two adjusting units 6 on the limiting mechanism 3 are connected by a rotating shaft. The rotating shaft is rotatably mounted on the base 61. The first drive motor 64 drives the rotating shaft to rotate relative to the base 61 through a worm gear transmission mechanism. The rotating shaft and the rotating rings 62 are connected by a gear transmission mechanism, thereby enabling the first drive motor 64 to drive the two rotating rings 62 in the limiting mechanism 3 to rotate synchronously and in the same direction.

[0068] See Figure 15 , Figure 16The cutting mechanism 4 is located between two adjusting units 6. The cutting mechanism 4 includes a cutting seat 41. A groove 42 is provided on the seat body 61. The groove 42 is annular. The center of the groove 42 and the center of the rotating ring 62 are on the same straight line. The cutting seat 41 is slidably disposed in the groove 42. Two drive wheels 43 are rotatably disposed on the cutting seat 41. The two drive wheels 43 are symmetrically disposed on the left and right sides of the cutting seat 41. A second drive motor 44 for driving either drive wheel 43 to rotate is installed on the cutting seat 41. The two drive wheels 43 are connected by a synchronous belt transmission mechanism. A second sliding seat 45 is slidably disposed on the cutting seat 41 and a third linear drive device 46 for driving the second sliding seat 45 to move is installed. A cutting saw blade 47 is rotatably disposed on the second sliding seat 45 and a third drive motor 48 for driving the cutting saw blade 47 to rotate is installed. The third drive motor 48 and the cutting saw blade 47 are connected by a synchronous belt transmission mechanism.

[0069] In use, the first linear drive device 63 drives the seat 61 of the limiting mechanism 3 to move in the same direction and at the same speed as the cable protection pipe, thereby keeping the seat 61 and the cable protection pipe in a relatively stationary state. Simultaneously, the driving effect of the rotating ring 62 on the drive seat 65 and the limiting seat 34 allows the roller 31 and the negative pressure suction cup 35 to abut against the cable protection tube in sequence (i.e., the roller 31 abuts against the recessed part of the cable protection tube, and the negative pressure suction cup 35 abuts against the protruding part of the cable protection tube). This fixes the state of the cable protection tube by pressing inward against the recessed part and grasping outward against the protruding part. Then, the driving effect of the third linear drive device 46 adjusts the distance between the cutting saw blade 47 and the cable protection tube. Finally, the driving effect of the second drive motor 44 and the third drive motor 48 causes the cutting seat 41 to move along the slide groove 42 to drive the rotating cutting saw blade 47 to cut the cable protection tube, thereby ensuring the flatness of the cut surface and improving the cutting quality.

[0070] During the process of the roller 31 and the negative pressure suction cup 35 abutting against the cable protection tube, the first sliding seat 32 on the drive seat 65 and the spring 33 between them reduce the obstruction to the operation of the negative pressure suction cup 35 abutting against the cable protection tube by the retraction of the first sliding seat 32 as the negative pressure suction cup 35 approaches the cable protection tube, thereby ensuring that the roller 31 and the negative pressure suction cup 35 can both abut against the cable protection tube.

[0071] See Figure 17The transfer mechanism 5 includes a rotating seat 51, which is rotatably mounted on the machine body 1 and its central axis is parallel to the straight conveying trajectory of the cable protection pipe. A fourth drive motor 52 is installed on the machine body 1 to drive the rotating seat 51 to rotate relative to the machine body 1. Several receiving slots 53 for accommodating the cable protection pipe are opened along its axial direction on the rotating seat 51. Each receiving slot 53 is arranged at an equal angle around the central axis of the rotating seat 51. The inlet of the receiving slot 53 can be located on the straight conveying trajectory of the cable protection pipe. A conveying wheel 54 is rotatably mounted at the inlet of the receiving slot 53. A fifth drive motor 55 is installed on the rotating seat 51 to drive the conveying wheel 54 to rotate.

[0072] In use, the fifth drive motor 55 drives the conveyor wheel 54, causing the cable protection tube, after being cut and separated, located in the receiving groove 53, to separate from the linearly conveyed cable protection tube under the action of the conveyor wheel 54 and completely enter the receiving groove 53. Then, the fourth drive motor 52 drives the rotating seat 51, causing the rotating seat 51 to rotate and move the cut and separated cable protection tube away from the linear conveying trajectory of the cable protection tube. The subsequent linearly conveyed cable protection tube extends into the next receiving groove 53 on the rotating seat 51.

[0073] During the rotation of the rotating seat 51, when the receiving groove 53 on the rotating seat 51 faces downward, the cable protection tube in the receiving groove 53 can be detached from the receiving groove 53 under the action of gravity for recycling.

[0074] The above description is merely illustrative of the invention. Those skilled in the art can make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not depart from the content of this specification or exceed the scope defined by the claims, all of which should fall within the protection scope of this invention.

Claims

1. A cable protection pipe manufacturing production line, characterized in that, include: The extrusion station uses an extruder to extrude cable protection tubes into tubular shapes, which are then transported in a straight line. The extrusion station uses an extrusion mechanism to extrude the cable protection tube and form several recesses arranged at equal angles around the central axis of the cable protection tube, so that a limiting channel for the cable to pass through is formed between adjacent recesses. The cooling station uses a water-cooling pool to cool and shape the cable protection pipe; The cutting station uses a limiting mechanism to limit the cutting position on both sides of the cable protection pipe, and the cutting mechanism performs a circumferential cut on the cutting position of the cable protection pipe. The transfer station uses a transfer mechanism to move the cut and separated cable protection pipes away from the straight transport track of the cable protection pipes; The extrusion mechanism and the limiting mechanism both include an adjustment unit, which includes a base and a rotating ring. The base of the extrusion mechanism is detachably mounted on the machine body. The base of the limiting mechanism is slidably mounted on the machine body, and a first linear drive device for driving the base to slide horizontally relative to the machine body is mounted on the machine body. The rotating ring is rotatably mounted on the base, and a first drive motor for driving the rotating ring to rotate relative to the base is mounted on the base. The first drive motor and the rotating ring are connected by a worm gear transmission mechanism and a gear transmission mechanism in sequence. Several drive seats are slidably mounted on the base along the radial direction of the rotating ring. Each drive seat is arranged at an equal angle around the central axis of the rotating ring. The drive seats and the rotating ring are connected by a gear transmission mechanism and a gear and rack transmission mechanism in sequence. The extrusion mechanism also includes several extrusion heads, each corresponding to a drive seat. The extrusion head is detachably mounted on the inner end of the drive seat. The inner end of the extrusion head and the end faces of both ends of the inner end are arc-shaped. An extension seat is detachably mounted on the extrusion end of the extruder. The extension seat can be inserted into the cable protection tube formed by the extruder. A support seat is provided between adjacent drive seats. Each support seat is arranged at an equal angle around the central axis of the extension seat and is parallel to the extension seat. A push seat is slidably mounted on the extension seat along its axial direction. A second linear drive device for driving the push seat to slide horizontally is installed on the extension seat. The support seat and the push seat are connected by two parallel hinge rods. One end of the hinge rod is hinged to the support seat, and the other end of the hinge rod is hinged and slidably mounted on the push seat. The two ends of the hinge rod are hinged to the extension seat.

2. The preparation production line according to claim 1, characterized in that: The limiting mechanism has two adjustment units and also includes several rollers. A first sliding seat is slidably arranged on the drive seat. A spring is provided between the first sliding seat and the drive seat, with the two ends of the spring abutting against the first sliding seat and the drive seat respectively. The rollers are rotatably arranged on the first sliding seat. A limiting seat is provided between adjacent drive seats. The limiting seat is slidably arranged on the seat body along the radial direction of the rotating ring. The limiting seat and the rotating ring are connected by a gear transmission mechanism and a gear and rack transmission mechanism in sequence. A negative pressure suction cup is detachably installed on the limiting seat. The negative pressure suction cup uses a negative pressure device to adsorb the cable protection tube.

3. The preparation production line according to claim 2, characterized in that: The cutting mechanism is located between two adjustment units. The cutting mechanism includes a cutting seat with a groove on the seat. The groove is circular, and the center of the groove and the rotating ring are on the same straight line. The cutting seat is slidably disposed in the groove. Two drive wheels are rotatably disposed on the cutting seat. The two drive wheels are symmetrically arranged on the left and right sides of the cutting seat. A second drive motor for driving either drive wheel is installed on the cutting seat. The two drive wheels are connected by a synchronous belt transmission mechanism. A second sliding seat is slidably disposed on the cutting seat and a third linear drive device for driving the second sliding seat to move is installed. A cutting saw blade is rotatably disposed on the second sliding seat and a third drive motor for driving the cutting saw blade to rotate is installed.

4. A method for manufacturing a production line based on the cable protection pipe according to any one of claims 1-3, characterized in that, Includes the following steps: Step 1: Convey the extruded cable protection tube in a straight line along its extrusion direction; Step 2: Press from the outside to the inside along the radial direction of the cable protection tube, so that the cable protection tube has recesses arranged at equal angles around its central axis, and a limiting channel for the cable to pass through is formed between adjacent recesses. Step 3: Cool and shape the extruded cable protection tube; Step 4: Cut the cooled and shaped cable protection tube, and apply negative pressure to both sides of the cutting position to limit the movement during the cutting process; Step 5: Remove the cut and separated cable protection pipe from the straight conveying track of the cable protection pipe and recycle it.

5. The method for preparing a cable protection pipe according to claim 4, characterized in that: In step 2, the direction of squeezing the cable protection pipe is on the same vertical plane.

6. The method for preparing a cable protection pipe according to claim 4, characterized in that: In step 2, during the process of the cable protection pipe being squeezed from the outside to the inside, the adjacent squeezing positions on the cable protection pipe are supported from the inside to the outside along its radial direction, and the support direction is on the same vertical plane as the squeezing direction.

7. The method for preparing a cable protection pipe according to claim 4, characterized in that: The maximum outer diameter of the compressed portion of the cable protection pipe is smaller than the inner diameter of the uncompressed portion.

8. The method for preparing a cable protection pipe according to claim 4, characterized in that: In step 4, the cutting trajectory is circular, the cutting device moves together with the cable protection pipe, and resets after the cutting is completed.

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