A tool for removing and installing a core of a jacket extruder

Abstract

The utility model discloses a kind of sheath extruding machine mould core dismounting and installing tools, including the force rod of slender structure and the mould core clamping position of fixedly arranged in the one end of force rod, the dismounting clamping position of mould core clamping position is adapted to mould core, force rod is vertically provided with force wrench near another end, force wrench and mould core clamping position between being provided with the positioning sleeve of adjustablely sleeved on force rod along axial direction, locking structure is connected between the positioning sleeve and force rod, outer diameter is adapted to the inner diameter of threading pipe and is rotatably cooperated with threading pipe. The utility model can assist to complete the quick dismounting of mould core, improve the operation safety while ensuring that mould core has higher coaxiality when installing, avoid damaging the thread of mould core.

Description

Technical Field

[0001] This utility model relates to the field of auxiliary tooling for cable manufacturing equipment, and in particular to a tool for disassembling and installing the die core of a sheath extruder. Background Technology

[0002] A sheath extruder is a specialized device for producing the outer sheath of cables and conductors. It heats plastic materials (such as PVC and PE) to a molten state and then uses a screw extruder to continuously and uniformly wrap it around the outside of the cable or conductor, forming a protective layer. The die core is part of the die assembly in the sheath extruder. During the extrusion process, the die core and the die sleeve (also called the outer die) work together to form the desired final product shape. Specifically, in manufacturing cable sheaths, the die core is designed to pass through the center of the cable, while molten plastic material is extruded through the gap between the die core and the die sleeve, thus forming a uniform sheath on the outside of the cable.

[0003] As the die core is a crucial component of the extrusion mold, it requires regular cleaning, maintenance, or replacement during production to ensure product quality and production efficiency. Typically, the die core is located within the die head cavity of a sheathed extruder and is connected to the die body or die head assembly via threads. It is installed or removed by rotation. For ease of operation, specific grooves are provided on the circumferential surface of the die core's inner hole as disassembly and assembly positions, allowing disassembly and assembly tools to be inserted into these grooves to apply circumferential force for removal or installation. Most existing disassembly and assembly tools are long, thin steel plates with ends machined to fit the disassembly and assembly positions of the die core. During disassembly and installation, the end of the steel plate is inserted through the conduit into the disassembly and assembly position to fix it circumferentially to the die core. Then, pipe wrenches are used to clamp the steel plate and rotate it to move the die core. This disassembly and assembly method is simple and quick, but it has the following problems: 1. When the steel plate is inserted into the mold core, since the steel plate itself has no support point in the conduit, only the end is in contact with the disassembly and assembly clip. When the pipe wrench is turned, it is easy to wobble from side to side. Moreover, a large force needs to be applied during disassembly and assembly, which poses certain safety hazards; 2. When installing the mold core, the threads must be aligned, otherwise the threads will be damaged. Since the steel plate has no support point, the alignment can only be done by the operator's experience and feel. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a tool for disassembling and installing the mold core of a sheath extruder. This tool assists in the rapid disassembly and assembly of the mold core, improves operational safety, and ensures high coaxiality of the mold core during installation, thus avoiding damage to the threads of the mold core.

[0005] The technical solution to achieve the purpose of this utility model is:

[0006] A tool for disassembling and installing a mold core in a sheath extruder includes a slender lever and a mold core holder fixed at one end of the lever. The mold core holder is adapted to a mold core disassembly holder. A wrench is vertically provided near the other end of the lever. A positioning sleeve is provided between the wrench and the mold core holder, which is axially adjustable and fitted onto the lever. A locking structure is connected between the positioning sleeve and the lever, and the outer diameter of the positioning sleeve is adapted to the inner diameter of the conduit and rotatably engages with the conduit.

[0007] Furthermore, the force-applying rod has a through hole extending radially through it near the other end, and the force-applying wrench is a round steel wrench that is adapted to the through hole and inserted into the through hole.

[0008] Furthermore, the positioning sleeve includes an annular body, and an integrally formed annular extension is provided on the outer peripheral surface of the annular body near the mold core slot. The annular extension is in clearance fit with the conduit, and the difference between the outer diameter and the inner diameter of the conduit is less than 1 mm.

[0009] Furthermore, the end face of the annular extension near the mold core slot is provided with an angle.

[0010] Furthermore, the inner hole of the annular body is clearance-fitted with the force-applying rod, and the clearance is less than 0.2 mm. The end of the annular body away from the annular extension is provided with a threaded hole extending radially to the inner hole. The locking structure adopts a fastening screw adapted to the threaded hole, and the end of the fastening screw abuts against the force-applying rod.

[0011] Furthermore, the outer circumferential surface of the force-adding rod is provided with a threaded groove, the width of which is adapted to the end of the fastening screw.

[0012] Furthermore, a circular fixing plate is coaxially provided between the mold core holder and the force rod, and the outer diameter of the fixing plate is the same as the outer diameter of the positioning sleeve.

[0013] Furthermore, an extension rod is coaxially provided on the side of the mold core slot away from the force-applying rod, and the outer diameter of the extension rod is adapted to the hole diameter of the mold core and penetrates the mold core.

[0014] By adopting the above technical solution, this utility model has the following beneficial effects:

[0015] (1) This utility model sets a mold core locking position at one end of the force-applying rod and sets a force-applying wrench near the other end to simulate the disassembly and assembly tools composed of iron blocks and pipe wrenches when disassembling and assembling the mold core. The structure is simpler. On this basis, a positioning sleeve is added. By adjusting the position of the positioning sleeve, the positioning sleeve is inserted into the conduit when in use, thereby basically eliminating the shaking space of the force-applying rod in the conduit. This can improve the coaxiality during mold core assembly, avoid thread damage caused by thread misalignment, and avoid the safety hazard caused by the force-applying rod shaking and disassembly locking position when a large force is applied for rotation.

[0016] (2) This utility model uses a round steel wrench inserted into the through hole to quickly form a force-applying wrench perpendicular to the force-applying rod, which is easy to assemble and simplifies the disassembly and assembly process.

[0017] (3) By setting the annular extension and the conduit in a gap fit, the annular extension can rotate relative to the conduit when the force rod rotates, and the gap is controlled within 1mm. This ensures that the positioning sleeve can be smoothly inserted into the conduit and rotated, while also preventing shaking.

[0018] (4) This utility model further facilitates insertion into the conduit by setting an angle at the end of the annular extension.

[0019] (5) This utility model uses fastening screws as the locking structure. The circumferential fixation is achieved by the end of the fastening screw abutting against the force rod. The structure is simple and the locking is convenient.

[0020] (6) This utility model provides a threaded groove on the outer circumferential surface of the force-adding rod. Within the range of the threaded groove, the positioning sleeve can move axially to any position, and the end of the locking screw can be inserted into the threaded groove. The side wall of the threaded groove further restricts the end of the locking screw, thereby improving the connection between the positioning sleeve and the force-adding rod and preventing it from loosening during use and causing it to detach from the conduit and fail.

[0021] (7) By adding a fixed plate, the present invention forms two supports on the force-adding rod, further eliminating swaying and improving coaxiality.

[0022] (8) By adding an extension rod, this utility model provides support for the mold core together with the mold core slot, avoiding the mold core from falling to the ground after being loosened when disassembling the mold core, and at the same time, better ensuring that the mold core body does not tilt when installing the mold core. Attached Figure Description

[0023] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0024] Figure 1 This is a simplified structural diagram of the present invention;

[0025] Figure 2 This is a simplified cross-sectional view of the present invention (the force-applying wrench and positioning sleeve are not shown in the figure);

[0026] Figure 3 for Figure 2 A simplified diagram of the structure in the right-view direction;

[0027] Figure 4 A simplified structural diagram of the locking state of the positioning sleeve of this utility model;

[0028] Figure 5 This is a simplified structural diagram of the positioning sleeve of this utility model.

[0029] The labels in the attached diagram are:

[0030] 1. Force bar, 1-1 through hole, 1-2 threaded groove, 2. Mold core holder, 3. Force wrench, 4. Positioning sleeve, 4-1 annular body, 4-1-1 threaded hole, 4-2 annular extension, 5. Locking structure, 6. Fixing plate, 7. Extension rod. Detailed Implementation

[0031] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0032] (Example 1)

[0033] like Figures 1 to 5 The tool for disassembling and installing the extruder core shown includes a slender lever 1 and a core retainer 2 fixed to the right end of the lever 1. The core retainer 2 is adapted to the core disassembly retainer. A wrench 3 is vertically mounted near the left end of the lever 1, simulating the disassembly and assembly tool consisting of an iron block and pipe wrenches, but with a simpler structure. In use, the lever 1 is inserted through the conduit and engaged in the core disassembly retainer 2. Then, the wrench 3 drives the lever 1 to rotate, thereby rotating the core through the core retainer 2 and achieving basic disassembly and assembly.

[0034] Specifically, the lever 1 has a through hole 1-1 extending radially through it near the left end. The wrench 3 is a round steel wrench that is compatible with the through hole 1-1 and inserted into the through hole 1-1, which makes assembly convenient and simplifies the disassembly and assembly process.

[0035] A positioning sleeve 4 is provided between the force wrench 3 and the mold core holder 2. During use, the positioning sleeve 4 is located inside the conduit, serving as a support for the force-applying rod 1. This essentially eliminates the wobbling space of the force-applying rod 1 within the conduit, improving the coaxiality during mold core assembly and preventing thread damage due to misalignment. It also prevents the force-applying rod 1 from wobbling and disengaging from the mounting / dismounting holder when large forces are applied during rotation, thus avoiding potential safety hazards. Specifically, the positioning sleeve 4 includes an annular body 4-1. An integrally formed annular extension 4-2 is provided on the outer circumference of the annular body 4-1 near the mold core holder. The annular extension 4-2 is clearance-fitted with the conduit, allowing it to rotate relative to the conduit when the force-applying rod rotates. The difference between the outer diameter of the annular extension 4-2 and the inner diameter of the conduit is less than 1mm, ensuring that the positioning sleeve 4 can smoothly insert into and rotate within the conduit while preventing wobbling. Meanwhile, the end face of the annular extension 4-2 near the mold core is also provided with an angle, which further facilitates the insertion of the positioning sleeve 4 into the conduit.

[0036] Considering the different conduit lengths of various extruder models, this embodiment sets the positioning sleeve 4 to be axially adjustable and fitted onto the force-applying rod 1. A locking structure 5 is connected between the positioning sleeve 4 and the force-applying rod 1 to fix the positioning sleeve 4 in the appropriate position. Specifically, the inner hole of the annular body 4-1 is clearance-fitted with the force-applying rod 1, with a clearance of less than 0.2 mm, thereby achieving a sliding connection. The end of the annular body 4-1 away from the annular extension 4-2 is provided with a threaded hole 4-1-1 extending radially into the inner hole. The locking structure 5 uses a fastening screw adapted to the threaded hole 4-1-1. The fastening screw passes through the threaded hole 4-1-1, and its end abuts against the force-applying rod 1, thereby achieving quick locking.

[0037] To prevent locking failure, this embodiment provides a threaded groove 1-2 on the outer circumferential surface of the force-applying rod 1. The width of the threaded groove 1-2 is adapted to the end of the fastening screw. Within the range of the threaded groove 1-2, the positioning sleeve 4 can move axially to any position, and the end of the locking screw can be engaged in the threaded groove 1-2, increasing the contact area. The side wall of the threaded groove 1-2 further restricts the end of the locking screw, thereby improving the connection firmness between the positioning sleeve 4 and the force-applying rod 1, and preventing the positioning sleeve 4 from loosening during use and detaching from the conduit, thus preventing failure.

[0038] A circular fixing plate 6 is coaxially provided between the mold core holder 2 and the force-applying rod 1. The outer diameter of the fixing plate 6 is the same as the outer diameter of the positioning sleeve 4, thereby forming two supports on the force-applying rod 1, further eliminating swaying and improving coaxiality.

[0039] An extension rod 7 is coaxially provided on the side of the mold core holder 2 away from the force-applying rod 1. The outer diameter of the extension rod 7 is adapted to the hole diameter of the mold core and passes through the mold core. In this embodiment, by adding the extension rod 7, together with the mold core holder 2, it provides support for the mold core, preventing the mold core from falling to the ground after being loosened when disassembling the mold core. At the same time, it can better ensure that the mold core body does not tilt when installing the mold core.

[0040] This embodiment uses a mold core locking position 2 at one end of the force-applying rod 1 and a force-applying wrench 3 near the other end to simulate the disassembly and assembly tools consisting of an iron block and pipe wrenches when disassembling and assembling the mold core. The structure is simpler. On this basis, a positioning sleeve 4 is added. By adjusting the position of the positioning sleeve 4, it is inserted into the conduit during use, thereby basically eliminating the wobbling space of the force-applying rod 1 in the conduit. This can improve the coaxiality during mold core assembly, avoid thread damage caused by thread misalignment, and avoid the safety hazard caused by the force-applying rod 1 shaking and disassembling the locking position when a large force is applied for rotation.

[0041] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A tool for disassembling and installing a mold core of a sheath extruder, characterized in that: The device includes a slender force-applying rod and a mold core holder fixed at one end of the force-applying rod. The mold core holder is adapted to a mold core disassembly holder. A force-applying wrench is vertically provided near the other end of the force-applying rod. A positioning sleeve is provided between the force-applying wrench and the mold core holder, which is axially adjustable and fitted onto the force-applying rod. A locking structure is connected between the positioning sleeve and the force-applying rod. The outer diameter of the positioning sleeve is adapted to the inner diameter of the conduit and rotates with the conduit.

2. The tool for disassembling and installing a sheath extruder mold core according to claim 1, characterized in that: The force-applying rod has a through hole extending radially through it near the other end, and the force-applying wrench is a round steel wrench that is adapted to the through hole and inserted into the through hole.

3. The tool for disassembling and installing a sheath extruder mold core according to claim 1, characterized in that: The positioning sleeve includes an annular body. The outer circumferential surface of the annular body is provided with an integrally formed annular extension at one end near the mold core slot. The annular extension is in clearance fit with the conduit, and the difference between the outer diameter and the inner diameter of the conduit is less than 1 mm.

4. The tool for disassembling and installing a sheath extruder mold core according to claim 3, characterized in that: The end face of the annular extension near the mold core slot is provided with an angle.

5. The tool for disassembling and installing a sheath extruder mold core according to claim 3, characterized in that: The inner hole of the annular body is clearance-fitted with the force-adding rod, and the clearance is less than 0.2 mm. The end of the annular body away from the annular extension is provided with a threaded hole extending radially to the inner hole. The locking structure adopts a fastening screw that is compatible with the threaded hole, and the end of the fastening screw abuts against the force-adding rod.

6. The tool for disassembling and installing a sheath extruder mold core according to claim 5, characterized in that: The outer circumferential surface of the force-adding rod is provided with a threaded groove, the width of which is adapted to the end of the fastening screw.

7. The tool for disassembling and installing a sheath extruder mold core according to claim 1, characterized in that: A circular fixing plate is provided coaxially between the mold core holder and the force rod, and the outer diameter of the fixing plate is the same as the outer diameter of the positioning sleeve.

8. A tool for disassembling and installing a sheath extruder mold core according to any one of claims 1 to 7, characterized in that: An extension rod is coaxially provided on the side of the mold core slot away from the force-applying rod. The outer diameter of the extension rod is adapted to the hole diameter of the mold core and passes through the mold core.

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