Extrusion device for producing plastic cable protection pipe

Abstract

The application discloses a kind of extrusion devices for plastic cable protection pipe production, belong to extruder technical field, including extruder, the side of the extruder is equipped with cooling pool, the side of the extruder facing cooling pool is connected with discharge pipe, the inside of the cooling pool is equipped with traction rod, further include capture mechanism, including multiple capture rods around discharge pipe axis being located in one end of discharge pipe, inner support mechanism, including multiple support blocks around discharge pipe axis being located in one end of discharge pipe, precooling mechanism, including two spray heads around discharge pipe axis being located in the inside of cooling pool, in the application, the application is torn by the same traction force linkage capture mechanism radial nondestructive shrinkage tightly embraces pipe head and prevents slip, and simultaneously drives inner support mechanism to outwardly unfold and supports inner wall to prevent shrinkage hole, cooperates precooling mechanism to make spray head surround rotation and realize pipe material rapid cooling skin and dynamically close, solves the deformation of starting pipe drawing, inner diameter shrinkage hole and the problem of wall thickness uneven caused by gravity, improves the forming quality of pipe material.

Description

Technical Field

[0001] This invention belongs to the field of extrusion technology, and particularly relates to an extrusion device for producing plastic cable protection pipes. Background Technology

[0002] Plastic cable protection pipes, such as CPVC high-voltage power pipes, MPP power pipes, or PE corrugated pipes, are indispensable basic building materials in modern urban power grid renovation, communication optical cable laying, and municipal underground pipe gallery construction. They have advantages such as good insulation, corrosion resistance, high compressive strength, and convenient construction. Their main function is to provide a solid physical barrier for high-voltage power cables or communication optical fibers buried deep underground, preventing damage from external extrusion, soil acid and alkali corrosion, and groundwater seepage. In the production process, plastic cable protection pipes are usually manufactured using extrusion molding. The extruder is the core equipment of the entire production line. Its working principle is to heat and melt solid polymer plastic particles into a fluid with extremely high viscosity and fluidity through an internal heating system and a rotating screw. Then, under great pressure, it is continuously pushed through a forming die of a specific shape, thereby extruding tubular material of the required cross-sectional shape.

[0003] The protective tubes, freshly extruded from the extruder die, are in a high-temperature, softened state. Before entering the cooling tank for solidification, they need to pass through a suspended transition zone and be pulled by traction equipment. At this point, the tubes have no rigidity, and the existing extruder's traction clamps cannot establish reliable gripping points at the soft tube opening, easily leading to slippage or flattening of the tube head, resulting in a high scrap rate upon startup. Under the longitudinal traction force, the inner diameter of the soft tubes is prone to shrinkage. In the suspended transition section, the high-temperature molten plastic will continue to flow and fall to the bottom of the tube due to its own gravity, causing the tubes to form a gravity collapse that is thinner at the top and thicker at the bottom before entering the cooling tank. Once this deformation is solidified by cold water in the cooling tank, it will directly lead to the local compressive strength of the protective tube failing to meet the standards, making the protective tubes prone to breakage when buried under pressure, posing a huge safety hazard. Summary of the Invention

[0004] The purpose of this invention is to solve the problems of outer diameter deformation, inner diameter shrinkage, and wall thickness eccentricity caused by the high temperature softening state of the pipe, unreliable traction force points, and gravity settlement during the suspended transition stage after extrusion molding of plastic cable protection pipes. Therefore, an extrusion device for producing plastic cable protection pipes is proposed.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: An extrusion apparatus for producing plastic cable protection pipes includes an extruder, a cooling tank on one side of the extruder, a discharge pipe connected to the side of the extruder facing the cooling tank, a traction rod inside the cooling tank, and further includes: The capturing mechanism includes multiple capturing rods located at one end of the discharge pipe around the axis of the discharge pipe, which synchronously rotate inward to capture the extruded protective tube. The internal support mechanism includes multiple support blocks arranged around the axis of the discharge pipe at one end of the discharge pipe. The multiple support blocks synchronously move away from each other to support the inner wall of the extrusion protection pipe. The pre-cooling mechanism includes two nozzles located inside the cooling pool, which surround the axis of the discharge pipe. The two nozzles rotate around the protective pipe and spray water onto the outer wall of the protective pipe for pre-cooling.

[0006] As a further description of the above technical solution: The capture mechanism further includes: a movable seat, a positioning seat, and a floating axis; The movable seat is located on one side of the cooling pool. The bottom of the positioning seat is connected to the top of the movable seat. The floating shaft is located inside the movable seat. The top of the floating shaft passes through the bottom of the movable seat. The bottom of the floating shaft is connected to one end of the traction rod.

[0007] As a further description of the above technical solution: The capture mechanism further includes: a floating plate, a contact plate, and a rotating groove; The floating plate is sleeved outside the floating shaft. The outer wall of the floating plate is rotatably connected to the bottom end of the capture rod through a block. The outer wall of one side of the contact plate is connected to the outer wall of one side of the top end of the capture rod. The rotating groove is opened on the outer wall of the bottom end of the capture rod away from the floating shaft.

[0008] As a further description of the above technical solution: The capture mechanism further includes: a fixed base, a floating groove, a pull rod, and a first spring; Multiple fixed seats are embedded in the bottom of the inner wall of the movable seat around the floating shaft axis. The floating groove is opened inside the fixed seat. The pull rod is located inside the floating groove. The top end of the pull rod is rotatably connected to the rotating groove through the rod body. The first spring is located inside the floating groove, and the two ends of the first spring are respectively connected to the bottom end of the pull rod and the corresponding position of the inner wall of the floating groove.

[0009] As a further description of the above technical solution: The internal support mechanism also includes: a support base, a central shaft, a baffle, and a second spring; The bottom of the support base is connected to the top of the positioning base. The central shaft is located inside the support base. The bottom end of the central shaft is connected to the top end of the floating shaft. The baffle is sleeved outside the bottom end of the central shaft. The second spring is located outside the central shaft, and the two ends of the second spring are respectively connected to the inner wall of the support base and the top of the baffle at corresponding positions.

[0010] As a further description of the above technical solution: The internal support mechanism further includes: a slide groove, a slider, a guide block, and a guide shell; Multiple grooves are formed around the axis of the support base on the top outer wall of the support base. The slider is located on one side of the support block. The outer wall of the slider is slidably connected to the inner wall of the groove. The guide block is located on the top of the support block. The guide shell is sleeved on the top of the central shaft. The bottom of the guide shell is slidably connected to the top of the guide block.

[0011] As a further description of the above technical solution: The precooling mechanism also includes: a rotating tube, a driven ring, a drive wheel, and a motor; One end of the rotating tube passes through the outer wall of the cooling tank facing the extruder. The driven ring is sleeved on the outside of the end of the rotating tube away from the cooling tank. The drive wheel is rotatably connected to the outer wall of the cooling tank facing the extruder. A chain is connected between the drive wheel and the driven ring. The motor is mounted on the outer wall of the cooling tank facing the extruder via a frame. The output end of the motor is connected to one side of the drive wheel.

[0012] As a further description of the above technical solution: The precooling mechanism also includes: a threaded tube, a push ring, and a limiting rod; One end of the threaded tube is connected to one end of the rotating tube. The pushing ring is located outside the threaded tube. The limiting rod is located outside the threaded tube around the axis of the threaded tube. One end of the limiting rod passes through the corresponding position on the outer wall of the pushing ring, and the other end of the limiting rod is connected to the corresponding position on the inner wall of the cooling pool.

[0013] As a further description of the above technical solution: The precooling mechanism also includes: a guide rail, a sliding seat, a mounting plate, and a rotating wheel; Two guide rails are symmetrically arranged at one end of the threaded tube, and two sliding seats are slidably connected to the guide rails at corresponding positions. The mounting plate is located on the top of the sliding seat, and the rotating wheel is rotatably connected to one end of the mounting plate. The inclined side wall of the rotating wheel can abut against the inclined inner wall of the pushing ring to push the mounting plate.

[0014] As a further description of the above technical solution: The precooling mechanism also includes: a telescopic rod, a third spring, and a mounting base; One end of the telescopic rod passes through the outer wall of the guide rail end plate. The third spring is located outside the telescopic rod, and the two ends of the third spring are respectively connected to the corresponding positions of the outer wall of the guide rail end plate and the corresponding positions of the side wall of the mounting plate. The mounting base is located on the top of the mounting plate, and the nozzle is embedded inside the mounting base.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. In this invention, by setting up a capture mechanism, the axial displacement generated by the traction rod pulling the floating shaft is converted into a radial clamping force that causes multiple capture rods to contract inward synchronously. This makes the greater the external traction force, the stronger the contact plate's gripping force on the outer wall of the pipe. Combined with the buffering effect of the first spring, the contact plate can tightly grip the pipe head while perfectly fitting and maintaining the initial circular shape of the protective pipe. This prevents the pipe opening from tearing or being flattened and deformed due to hard pulling during the start-up pipe-leading stage, thus improving the success rate of pipe-leading.

[0016] 2. In this invention, by setting an internal support mechanism, which uses the same power source as the capture mechanism, the central shaft and guide shell are axially displaced. The inclined structure at the bottom of the guide shell is used to force multiple support blocks to spread radially outward along the slide groove. When the protective tube is in a deformable, high-temperature, and high-elastic state, the support blocks press against the inner wall of the protective tube from the inside, forming a solid internal support skeleton. This counteracts the stress caused by the cooling and shrinkage of the plastic and the tendency of the tube diameter to shrink due to external traction, ensuring the accuracy of the inner diameter of the cable protection tube and guaranteeing the smoothness of subsequent cable threading.

[0017] 3. In this invention, by setting a pre-cooling mechanism, the nozzle can not only spray the pipe 360 ​​degrees without dead angles under the drive of the motor, but also use the rotation of the threaded pipe to make the push ring axially displaced and squeeze the rotating wheel, forcing the nozzle to continuously approach the surface of the pipe. It can cool and harden the skin in the softest transition section of the pipe in the most efficient way, which solves the defect of uneven wall thickness caused by the downward flow of uncooled plastic due to its own gravity, and improves the final quality of the pipe. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main structure of an extrusion device for producing plastic cable protection pipes according to the present invention; Figure 2 This is a schematic diagram showing the disassembled structure of an extrusion device for producing plastic cable protection pipes according to the present invention; Figure 3 This is a partial half-sectional structural diagram of an extrusion device for producing plastic cable protection pipes according to the present invention. Figure 4 This is a schematic diagram of the capture mechanism structure of an extrusion device for producing plastic cable protection pipes according to the present invention; Figure 5 This is a half-sectional schematic diagram of the capture mechanism of an extrusion device for producing plastic cable protection pipes according to the present invention; Figure 6 This is a schematic diagram of the internal support mechanism of an extrusion device for producing plastic cable protection pipes according to the present invention; Figure 7 This is a half-sectional schematic diagram of the internal support mechanism of an extrusion device for producing plastic cable protection pipes according to the present invention. Figure 8 This is a schematic diagram of the precooling mechanism of an extrusion device for producing plastic cable protection pipes according to the present invention. Figure 9 This is a half-sectional view of the precooling mechanism of an extrusion device for producing plastic cable protection pipes according to the present invention. Figure 10 This is a schematic diagram of the precooling mechanism of an extrusion device for producing plastic cable protection pipes, as proposed in this invention.

[0019] Legend: 1. Extruder; 2. Discharge pipe; 3. Cooling pool; 4. Traction rod; 5. Capturing mechanism; 501. Moving seat; 502. Positioning seat; 503. Floating shaft; 504. Floating plate; 505. Capturing rod; 506. Contact plate; 507. Rotating groove; 508. Fixed seat; 509. Floating groove; 510. Pull rod; 511. First spring; 6. Internal support mechanism; 601. Support seat; 602. Central shaft; 603. Baffle; 604. Second spring; 605. 606. Slide rail; 607. Support block; 608. Slider; 609. Guide shell; 6000. Guide block; 701. Pre-cooling mechanism; 702. Rotating tube; 703. Drive wheel; 704. Chain; 705. Motor; 706. Threaded tube; 707. Push ring; 708. Limiting rod; 709. Guide rail; 710. Sliding seat; 711. Mounting plate; 712. Telescopic rod; 713. Third spring; 714. Rotary wheel; 715. Mounting seat; 716. Nozzle. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figures 1-10 This invention provides a technical solution: an extrusion device for producing plastic cable protection pipes, including an extruder 1, a cooling tank 3 on one side of the extruder 1, a discharge pipe 2 connected to the side of the extruder 1 facing the cooling tank 3, a traction rod 4 inside the cooling tank 3, and further comprising: The capturing mechanism 5 includes multiple capturing rods 505 arranged around the axis of the discharge pipe 2 at one end of the discharge pipe 2. The multiple capturing rods 505 synchronously rotate inward to capture the extruded protective tube. The internal support mechanism 6 includes multiple support blocks 606 arranged around the axis of the discharge pipe 2 at one end of the discharge pipe 2. The multiple support blocks 606 synchronously move away from each other to support the inner wall of the extrusion protection pipe. The pre-cooling mechanism 7 includes two nozzles 716 arranged inside the cooling pool 3 around the axis of the discharge pipe 2. The two nozzles 716 rotate around the protective pipe and spray the outer wall of the protective pipe for pre-cooling.

[0022] Please see Figures 4-5 The capture mechanism 5 also includes: a floating plate 504, a contact plate 506, and a rotating groove 507; The floating plate 504 is sleeved outside the floating shaft 503. The outer wall of the floating plate 504 is rotatably connected to the bottom end of the capture rod 505 through a block. The outer wall of one side of the contact plate 506 is connected to the outer wall of one side of the top end of the capture rod 505. The rotating groove 507 is opened on the outer wall of the bottom end of the capture rod 505 away from the floating shaft 503.

[0023] The capture mechanism 5 also includes: a fixed base 508, a floating groove 509, a pull rod 510, and a first spring 511; Multiple fixed seats 508 are embedded in the bottom of the inner wall of the movable seat 501 around the axis of the floating shaft 503. The floating groove 509 is opened inside the fixed seat 508. The pull rod 510 is located inside the floating groove 509. The top end of the pull rod 510 is rotatably connected to the rotating groove 507 through the rod body. The first spring 511 is located inside the floating groove 509, and the two ends of the first spring 511 are respectively connected to the bottom end of the pull rod 510 and the corresponding position of the inner wall of the floating groove 509.

[0024] Specifically: the traction rod 4 is controlled by an external control system. One end of the traction rod 4 is connected to the bottom end of the floating shaft 503. After the extruder 1 extrudes the protective tube from the discharge pipe 2, the external control system controls the traction rod 4 to move away from the discharge pipe 2 and pulls the floating shaft 503, causing the floating shaft 503 to move downward relative to the moving seat 501. The floating plate 504 moves synchronously with the floating shaft 503. During the downward movement of the floating plate 504 relative to the moving seat 501, it pulls the bottom end of the capturing rod 505, causing the capturing rod 505 to... The bottom end rotates towards the floating shaft 503, and the capture rod 505 rotates to pull the pull rod 510 up relative to the fixed seat 508. The first spring 511 is stretched, and the top of the capture rod 505 drives the contact plate 506 to move synchronously, so that the outer wall of the contact plate 506 contacts and fits with the outer wall of the protective tube. The tops of the four capture rods 505 move towards the axis of the floating shaft 503 synchronously, driving the four contact plates 506 to combine into a ring, so that the capture mechanism 5 captures the end of the protective tube while maintaining the shape of the protective tube.

[0025] Please see Figures 6-7 The internal support mechanism 6 also includes: a support base 601, a central shaft 602, a baffle 603, and a second spring 604; The bottom of the support base 601 is connected to the top of the positioning base 502. The central shaft 602 is located inside the support base 601. The bottom end of the central shaft 602 is connected to the top end of the floating shaft 503. The baffle 603 is sleeved on the outside of the bottom end of the central shaft 602. The second spring 604 is located on the outside of the central shaft 602, and the two ends of the second spring 604 are respectively connected to the inner wall of the support base 601 and the top of the baffle 603 at corresponding positions.

[0026] The internal support mechanism 6 also includes: a slide 605, a slider 607, a guide block 609, and a guide shell 608; Multiple grooves 605 are formed around the axis of the support base 601 on the top outer wall of the support base 601. A slider 607 is located on one side of the support block 606. The outer wall of the slider 607 is slidably connected to the inner wall of the groove 605. A guide block 609 is located on the top of the support block 606. A guide shell 608 is sleeved on the top of the central shaft 602. The bottom of the guide shell 608 is slidably connected to the top of the guide block 609.

[0027] Specifically, when the protective tube is extruded and the external control system controls the traction rod 4 to trigger the capture mechanism 5, the top of the support seat 601 is inserted into the protective tube. The traction rod 4 pulls the floating shaft 503, which in turn pulls the central shaft 602. The central shaft 602 moves downward relative to the support seat 601, the second spring 604 is stretched, the bottom of the guide shell 608 presses down on the support block 606, the slider 607 makes the support block 606 slide along the direction of the slide groove 605, and the guide block 609 guides the support block 606 to move radially, so that the four support blocks 606 move away from each other and radially, expanding the support range of the inner support mechanism 6. The outer wall of the support block 606 presses against the inner wall of the protective tube to support the inner wall of the protective tube, preventing the inner diameter of the protective tube from changing due to the uncooled flow of plastic.

[0028] Please see Figures 8-10 The precooling mechanism 7 also includes: a rotating tube 701, a driven ring 702, a drive wheel 703, and a motor 705; One end of the rotating tube 701 passes through the outer wall of the cooling pool 3 facing the extruder 1. The driven ring 702 is sleeved on the outside of the end of the rotating tube 701 away from the cooling pool 3. The drive wheel 703 is rotatably connected to the outer wall of the cooling pool 3 facing the extruder 1. A chain 704 is connected between the drive wheel 703 and the driven ring 702. The motor 705 is mounted on the outer wall of the cooling pool 3 facing the extruder 1 through a frame. The output end of the motor 705 is connected to one side of the drive wheel 703.

[0029] The precooling mechanism 7 also includes: a threaded pipe 706, a push ring 707, and a limit rod 708; One end of the threaded tube 706 is connected to one end of the rotating tube 701. The pushing ring 707 is located outside the threaded tube 706. The limiting rod 708 is located outside the threaded tube 706 around the axis of the threaded tube 706. One end of the limiting rod 708 passes through the corresponding position on the outer wall of the pushing ring 707, and the other end of the limiting rod 708 is connected to the corresponding position on the inner wall of the cooling pool 3.

[0030] The precooling mechanism 7 also includes: a guide rail 709, a sliding seat 710, a mounting plate 711, and a rotating wheel 714; Two guide rails 709 are symmetrically arranged at one end of the threaded tube 706. Two sliding seats 710 are slidably connected to the guide rails 709 at corresponding positions. The mounting plate 711 is arranged on the top of the sliding seat 710. The rotating wheel 714 is rotatably connected to one end of the mounting plate 711. The inclined side wall of the rotating wheel 714 can abut against the inclined inner wall of the pushing ring 707 to push the mounting plate 711.

[0031] The precooling mechanism 7 also includes: a telescopic rod 712, a third spring 713, and a mounting base 715; One end of the telescopic rod 712 passes through the outer wall of one end plate of the guide rail 709. The third spring 713 is located outside the telescopic rod 712, and the two ends of the third spring 713 are respectively connected to the corresponding positions of the outer wall of one end plate of the guide rail 709 and the corresponding positions of the side wall of the mounting plate 711. The mounting base 715 is located on the top of the mounting plate 711, and the nozzle 716 is embedded inside the mounting base 715.

[0032] Specifically: the capture mechanism 5 and the inner support mechanism 6 respectively limit the outer diameter shape and inner diameter size of the protective tube. The traction rod 4 continuously pulls the capture mechanism 5 and the inner support mechanism 6 as a whole. The inner wall of the rotating tube 701 is provided with a guide rod around its axis, and the outer wall of the guide rod slides relative to the inner wall of the groove on the outer wall of the moving seat 501 to guide the movement direction of the capture mechanism 5. When the end of the protective tube is pulled into the cooling pool 3, the motor 705 drives the drive wheel 703 to rotate through the output end. The drive wheel 703 drives the driven ring 702 to rotate through the chain 704. The driven ring 702 drives the rotating tube 701 to rotate synchronously. The rotating tube 701 drives the threaded tube 706 to rotate synchronously. The outer wall of the threaded tube 706... The wall has two threaded grooves with the same pitch and opposite directions. The external thread on the outer wall of the threaded tube 706 meshes with the internal thread on the inner wall of the push ring 707. The two threaded grooves of the threaded tube 706 are connected by a transition curve to form a closed spiral track and the motion conversion is achieved by the thrust of the spiral side on the push ring 707. The limit rod 708 restricts the rotation of the push ring 707, so that the push ring 707 moves along the axis of the threaded tube 706. The threaded tube 706 drives the guide rail 709 to rotate. The guide rail 709 drives the mounting plate 711 to move synchronously through the sliding seat 710. The mounting plate 711 drives the mounting seat 715 to move synchronously. The mounting seat 715 drives the nozzle 716 to rotate around the protective tube. Furthermore, the mounting plate 711 drives the rotating wheel 714 to rotate around the axis of the threaded tube 706. The side wall of the rotating wheel 714 is set as an inclined surface, and the outer wall of the pushing ring 707 facing the rotating wheel 714 is also set as an inclined surface. The inclined surfaces of the two abut against each other. When the pushing ring 707 moves away from the threaded tube 706 along the axis of the threaded tube 706, the pushing ring 707 pushes the rotating wheel 714 through the inclined surface. The rotating wheel 714 pushes the mounting plate 711 to move along the guide rail 709. The telescopic rod 7 12. One end plate of the guide rail 709 extends out, the third spring 713 is compressed, the mounting plate 711 drives the mounting base 715 to move synchronously, the mounting base 715 drives the nozzle 716 to move synchronously, the nozzle 716 moves closer to the axis of the threaded tube 706, so that the distance between the nozzle 716 and the outer wall of the protective tube is reduced, the cooling efficiency is improved, and the outer wall of the protective tube hardens quickly, preventing the uncooled thermoplastic from collapsing due to its own gravity during the transition stage of the protective tube from the outlet to the cooling pool 3, which affects the quality of the finished product.

[0033] Working principle: During use, after the extruder 1 extrudes the protective tube from the discharge pipe 2, the external control system controls the traction rod 4 to move away from the discharge pipe 2, pulling the floating shaft 503 downward relative to the moving seat 501. The downward movement of the floating shaft 503 drives the floating plate 504 to move downward synchronously, pulling the bottom end of the capture rod 505, causing it to rotate around the bottom end as an axis towards the floating shaft 503. The pull rod 510 rises accordingly and stretches the first spring 511. The top end of the capture rod 505 drives the four contact plates 506 to move synchronously. The components move towards the center, forming a ring that fits tightly against the outer wall of the protective tube, thus maintaining the shape of its outer diameter while pulling the tube. As the floating shaft 503 moves downward, it simultaneously pulls the central shaft 602 downward relative to the support seat 601, stretching the second spring 604. The guide shell 608 at the top of the central shaft 602 then presses down, guiding the slider 607 outward along the groove 605 via the guide block 609. This causes the four support blocks 606 to move radially away from each other synchronously, expanding the support range. The support blocks 606 press tightly against the wall. After the end of the protective pipe is pulled into the cooling pool 3, the motor 705 starts and drives the drive wheel 703 to rotate. Through the chain 704, the driven ring 702 rotates synchronously with the rotating pipe 701, thereby driving the overall pre-cooling assembly with nozzles 716 to continuously rotate around the outer wall of the protective pipe, achieving all-around spraying. The rotating pipe 701 drives the threaded pipe 706 to rotate. The closed spiral track on the outer wall of the threaded pipe 706 engages with the internal thread of the push ring 707. The limit rod 708 prevents the push ring 702 from rotating. 7. Under the constraint of rotation, the rotational motion of the threaded tube 706 is converted into the reciprocating linear movement of the push ring 707 along the axial direction of the threaded tube 706. The push ring 707 and the rotating wheel 714 are provided with inclined surfaces on their respective sides. When the push ring 707 moves axially, its inclined surface presses against the inclined surface of the rotating wheel 714, pushing the mounting plate 711 to move towards the center along the guide rail 709, compressing the third spring 713. The nozzle 716 on the mounting base 715 then moves radially closer to the outer wall of the protective tube, shortening the spraying distance.

[0034] In this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An extrusion apparatus for producing plastic cable protection pipes, comprising an extruder (1), a cooling tank (3) provided on one side of the extruder (1), a discharge pipe (2) connected to the side of the extruder (1) facing the cooling tank (3), and a traction rod (4) provided inside the cooling tank (3), characterized in that, Also includes: The capturing mechanism (5) includes multiple capturing rods (505) arranged around the axis of the discharge pipe (2) at one end of the discharge pipe (2), which capture the extruded protective tube by synchronously rotating inward through the multiple capturing rods (505); The internal support mechanism (6) includes multiple support blocks (606) arranged around the axis of the discharge pipe (2) at one end of the discharge pipe (2), and the multiple support blocks (606) support the inner wall of the extrusion protection pipe by moving away from each other synchronously. The precooling mechanism (7) includes two nozzles (716) arranged inside the cooling pool (3) around the axis of the discharge pipe (2). The two nozzles (716) rotate around the protective pipe and spray the outer wall of the protective pipe for precooling.

2. The extrusion apparatus for producing plastic cable protection pipes according to claim 1, characterized in that, The capture mechanism (5) also includes: A movable seat (501) is provided on one side of the cooling pool (3); Positioning seat (502), the bottom of which is connected to the top of movable seat (501); A floating shaft (503) is located inside the movable seat (501). The top end of the floating shaft (503) passes through the bottom of the movable seat (501), and the bottom end of the floating shaft (503) is connected to one end of the traction rod (4).

3. The extrusion apparatus for producing plastic cable protection pipes according to claim 2, characterized in that, The capture mechanism (5) also includes: A floating plate (504) is sleeved on the outside of a floating shaft (503), and the outer wall of the floating plate (504) is rotatably connected to the bottom end of a capture rod (505) through a block. A contact plate (506) is provided, wherein one outer wall of the contact plate (506) is connected to one outer wall of the top end of the capture rod (505); Rotating groove (507) is formed on the outer wall of the bottom end of the capture rod (505) away from the floating shaft (503).

4. The extrusion apparatus for producing plastic cable protection pipes according to claim 3, characterized in that, The capture mechanism (5) also includes: Fixed base (508), a plurality of fixed bases (508) are embedded in the bottom of the inner wall of the movable base (501) around the axis of the floating shaft (503); A floating groove (509) is formed inside a fixed base (508); A pull rod (510) is provided inside a floating groove (509), and the top end of the pull rod (510) is rotatably connected to a rotating groove (507) via a rod body; The first spring (511) is located inside the floating groove (509), and the two ends of the first spring (511) are respectively connected to the bottom end of the pull rod (510) and the corresponding position of the inner wall of the floating groove (509).

5. The extrusion apparatus for producing plastic cable protection pipes according to claim 2, characterized in that, The internal support mechanism (6) also includes: A support base (601) is provided, the bottom of which is connected to the top of a positioning base (502). A central shaft (602) is located inside a support base (601), and the bottom end of the central shaft (602) is connected to the top end of a floating shaft (503). A baffle (603) is sleeved on the outside of the bottom end of the central shaft (602); The second spring (604) is located outside the central shaft (602), and the two ends of the second spring (604) are respectively connected to the inner wall of the support base (601) and the top of the baffle (603).

6. The extrusion apparatus for producing plastic cable protection pipes according to claim 5, characterized in that, The internal support mechanism (6) also includes: Slide grooves (605), a plurality of said slide grooves (605) are formed around the axis of the support base (601) on the top outer wall of the support base (601); A slider (607) is disposed on one side of a support block (606), and the outer wall of the slider (607) is slidably connected to the inner wall of a groove (605); Guide block (609), the guide block (609) is disposed on the top of support block (606); A guide shell (608) is sleeved on the top of the central shaft (602), and the bottom of the guide shell (608) is slidably connected to the top of the guide block (609).

7. The extrusion apparatus for producing plastic cable protection pipes according to claim 1, characterized in that, The precooling mechanism (7) further includes: Rotating tube (701), one end of which passes through the outer wall of the cooling pool (3) facing the extruder (1); Driven ring (702), the driven ring (702) is sleeved on the outside of the end of the rotating tube (701) away from the cooling pool (3); The drive wheel (703) is rotatably connected to the outer wall of the cooling pool (3) facing the extruder (1), and a chain (704) is connected between the drive wheel (703) and the driven ring (702). The motor (705) is mounted on the outer wall of the cooling pool (3) facing the extruder (1) via a frame, and the output end of the motor (705) is connected to one side of the drive wheel (703).

8. The extrusion apparatus for producing plastic cable protection pipes according to claim 7, characterized in that, The precooling mechanism (7) further includes: A threaded tube (706), one end of which is connected to one end of a rotating tube (701); A push ring (707) is disposed outside the threaded tube (706); The limiting rod (708) is located around the axis of the threaded tube (706) and outside the threaded tube (706). One end of the limiting rod (708) passes through the corresponding position on the outer wall of the push ring (707), and the other end of the limiting rod (708) is connected to the corresponding position on the inner wall of the cooling pool (3).

9. An extrusion apparatus for producing plastic cable protection pipes according to claim 8, characterized in that, The precooling mechanism (7) further includes: Guide rails (709), two guide rails (709) are symmetrically arranged at one end of the threaded tube (706); Sliding seats (710), the two sliding seats (710) are respectively slidably connected to the guide rails (709) at corresponding positions; Mounting plate (711), which is located on top of sliding seat (710); Rotary wheel (714) is rotatably connected to one end of mounting plate (711). The inclined side wall of the rotary wheel (714) can abut against the inclined inner wall of the push ring (707) to push the mounting plate (711).

10. An extrusion apparatus for producing plastic cable protection pipes according to claim 9, characterized in that, The precooling mechanism (7) further includes: Telescopic rod (712), one end of which passes through the outer wall of one end plate of guide rail (709); The third spring (713) is located outside the telescopic rod (712), and the two ends of the third spring (713) are respectively connected to the corresponding positions on the outer wall of one end plate of the guide rail (709) and the corresponding positions on the side wall of the mounting plate (711). Mounting base (715), which is located on top of mounting plate (711), and nozzle (716) is embedded inside mounting base (715).

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