Plastic extruding machine die head for cable production

Abstract

The utility model discloses an extruding machine die head for cable production, which belongs to the technical field of cable production equipment and comprises a fixing sleeve, a die sleeve and a die core, one end of the fixing sleeve is provided with a fixing edge inwards in a protruding manner along the radial direction, the die sleeve is slidably arranged in the fixing sleeve along the axial direction of the fixing sleeve, and the die core comprises a die core body and a fixing ring which are connected with each other. The mold core body is arranged in the fixing sleeve, a material injection channel is formed between the mold core body and the mold sleeve, the fixing ring is fixedly connected with the end face, away from the fixing edge, of the fixing sleeve, a stud is installed on the fixing edge, the stud penetrates through the fixing edge and is in threaded connection with the fixing edge, and one end of the stud is rotationally connected with the mold sleeve. According to the plastic extruding machine die head for cable production, the die distance can be adjusted without rotating the die sleeve, the operation is simpler and more convenient, and the adjusting efficiency of the die distance of the die head is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cable production equipment, in particular to an extruder die head for cable production. Background Art

[0002] Cable extruder is an important equipment in the production of wires and cables. Its main function is to evenly extrude the molten plastic on the outer layer of the conductor of the wire and cable to form a continuous insulation layer. The extruder die is a key component of the extruder. Reasonable die matching is conducive to high-quality cable production.

[0003] The die head of the extruder generally includes a die core and a die sleeve, wherein the die core is used for the cable to pass through, and the die sleeve is used to limit the size of the insulating layer after extrusion molding. After the die core and the die sleeve are assembled in place, an injection channel for the molten cable material to enter the die head is formed between the two. The axial distance between the center holes of the die core and the die sleeve is called the die spacing of the die head, and this distance is mainly used to adjust the extrusion pressure. With the advancement of technology, the die spacing on the die head of the extruder has gradually developed in the direction of being adjustable. For example, the Chinese patent document with the publication number CN220548668U discloses an extrusion die for a cable sheath extruder, wherein the die core and the die sleeve are connected by threaded fitting, and the die spacing can be adjusted by rotating the die sleeve relative to the die core. The solution in the above patent document requires the die sleeve to be rotated as a whole when adjusting the die spacing. At the same time, in order to prevent loosening, an elastic member is also arranged between the two. The elastic force of the elastic member will further hinder the rotation of the die sleeve, resulting in inconvenience in operation and not conducive to rapid adjustment of the die spacing. Utility Model Content

[0004] The technical problem to be solved by the utility model is that in the prior art, the die spacing adjustment operation is inconvenient and not conducive to rapid adjustment of the die spacing. Based on this, the utility model provides a die head of an extruder for cable production, which is convenient for adjusting the die spacing.

[0005] The utility model adopts the following technical solution to solve the technical problem: an extruder die head for cable production, comprising a fixed sleeve, a die sleeve and a die core, one end of the fixed sleeve is provided with a fixed edge protruding radially inward, the die sleeve is slidably arranged in the fixed sleeve along the axial direction of the fixed sleeve, the die core comprises a die core body and a fixed ring connected to each other, the die core body is arranged in the fixed sleeve, an injection channel is formed between the die core body and the die sleeve, the fixed ring is fixedly connected to the end face of the fixed sleeve away from the fixed edge, a stud is installed on the fixed edge, the stud passes through the fixed edge and is threadedly connected to the fixed edge, and one end of the stud is rotatably connected to the die sleeve.

[0006] Furthermore, a bearing is installed on the end face of the mold sleeve close to the fixed edge, the outer ring of the bearing is interference fit with the mold sleeve, and one end of the stud is provided with a smooth connecting section along the bearing, and the connecting section is interference fit with the inner ring of the bearing.

[0007] Furthermore, a bushing is fixedly mounted on the fixed edge, a threaded hole is formed on the bushing, and the stud is threadedly connected to the threaded hole.

[0008] Furthermore, an operating portion is provided at one end of the stud opposite to the connecting section.

[0009] Furthermore, a positioning column is protruded along the axial direction of the mold sleeve on the end surface of the mold sleeve away from the mold core, and the positioning column cooperates with the central hole wall of the fixed edge, and the positioning column can move relative to the fixed edge under the drive of the mold sleeve.

[0010] Furthermore, scale lines are arranged on the outer wall of the positioning post along the axial direction of the positioning post.

[0011] Furthermore, a feed groove is provided on the side wall of the fixing sleeve, and the feed groove is communicated with the injection channel.

[0012] Furthermore, an inner conical groove is formed at one end of the mold sleeve close to the mold core, and the inner conical groove is connected to the inner cavity of the mold sleeve. An outer cone portion is convexly formed on one end of the mold core body close to the mold sleeve, and the injection channel is formed by the space sandwiched between the groove wall of the inner conical groove and the conical surface of the outer cone portion.

[0013] Furthermore, the groove wall of the inner conical groove is smoothly transitionally connected to the end surface of the mold sleeve, and the outer conical portion is smoothly transitionally connected to the end surface of the mold core body.

[0014] The beneficial effect of the utility model is that the utility model provides a die head for an extruder for cable production. When the user adjusts the die spacing according to production requirements, he only needs to rotate the stud so that the stud moves along its own axial direction, which can further drive the die sleeve to move relative to the die core, thereby changing the distance between the die sleeve and the die core to achieve the function of adjusting the die spacing. Compared with the traditional method of adjusting the die spacing by rotating the entire die sleeve, the die head of the utility model does not need to rotate the die sleeve, and the operation is simpler and more convenient, which greatly improves the adjustment efficiency of the die spacing of the die head. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0016] Figure 1 The utility model is a structural schematic diagram of a die head of an extruder for cable production.

[0017] In the figure: 1, fixing sleeve, 11, fixing edge, 12, feed groove, 13, bushing, 131, threaded hole, 2, mold sleeve, 21, inner cone groove, 3, mold core, 31, mold core body, 32, fixing ring, 30, injection channel, 4, stud, 41, connecting section, 42, operating part, 5, bearing, 6, bolt. DETAILED DESCRIPTION

[0018] Now the utility model is described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, which only illustrates the basic structure of the utility model in a schematic manner, so it only shows the components related to the utility model.

[0019] See also Figure 1 The utility model provides an extruder die head for cable production, comprising a fixed sleeve 1, a die sleeve 2 and a die core 3. The fixed sleeve 1 is a cylindrical structure with two ends through, one end of the fixed sleeve 1 protrudes inward along the radial direction of the fixed sleeve 1 to form a fixed edge 11, the die sleeve 2 is slidably arranged in the fixed sleeve 1 along the axial direction of the fixed sleeve 1, the die core 3 comprises a core body 31 and a fixed ring 32 connected to each other, the fixed ring 32 is fixedly connected to the core body 31, the core body 31 is cooperatively installed in the fixed sleeve 1, an injection channel 30 is formed between the core body 31 and the die sleeve 2, the fixed ring 32 is fixedly connected to the end face of the fixed sleeve 1 away from the fixed edge 11, a stud 4 is installed on the fixed edge 11, the stud 4 passes through the fixed edge 11 and is threadedly connected to the fixed edge 11, and one end of the stud 4 is rotatably connected to the die sleeve 2.

[0020] When assembling the extruder die head for cable production of the utility model, first thread the stud 4 through the fixed edge 11, then install the die sleeve 2 into the fixed sleeve 1 from the side of the fixed sleeve 1 away from the fixed edge 11, and connect the stud 4 to the side wall of one end of the die sleeve 2, so that the two can rotate relative to each other. Next, the core body 31 is inserted into the fixed sleeve 1, and the fixing ring 32 is fixedly connected to the fixed sleeve 1, and the assembly of the extruder die head is completed. After the assembly is completed, the core 3 is fixedly installed on the core seat of the extruder, so as to realize the fixed connection relationship between the extruder die head and the extruder.

[0021] During normal operation, the molten plastic enters the die through the injection channel 30 and contacts the cable conductor passing through the die. When the cable passes through the die, the plastic forms a uniform insulation layer on the outside of the conductor.

[0022] When the user adjusts the die spacing according to production requirements, he only needs to rotate the stud 4 so that the stud 4 moves along its own axial direction, which can further drive the die sleeve 2 to move relative to the die core 3, thereby changing the distance between the die sleeve 2 and the die core 3 to achieve the function of adjusting the die spacing. Compared with the traditional method of adjusting the die spacing by rotating the entire die sleeve, the die head of the utility model does not need to rotate the die sleeve 2, and the operation is simpler and more convenient, which greatly improves the adjustment efficiency of the die head die spacing.

[0023] As a preferred embodiment, a bearing 5 is installed on the end surface of the die sleeve 2 close to the fixed edge 11, and the outer ring of the bearing 5 is interference fit with the die sleeve 2. A smooth connecting section 41 is axially protruded at one end of the stud 4. The connecting section 41 is a cylindrical structure, and the outer diameter of the connecting section 41 is smaller than the aperture of the threaded hole 131 on the fixed edge 11, so that the connecting section 41 can pass through the threaded hole 131. The connecting section 41 is interference fit with the inner ring of the bearing 5, so that the stud 4 is installed on the die sleeve 2, and the two can rotate relative to each other under the action of the bearing 5. The bearing 5 supports the stud 4, improves the smoothness of the rotation of the two, and prevents the two from being easily loosened, ensuring that the stud 4 can drive the die sleeve 2 to move back and forth along the axial direction.

[0024] Furthermore, a bushing 13 is fixedly installed on the fixed edge 11, a threaded hole 131 is opened on the bushing 13, the stud 4 is threadedly connected to the threaded hole 131, and the hardness of the bushing 13 is greater than the hardness of the fixed edge 11. By setting the bushing 13, the fixed edge 11 can be prevented from being easily damaged due to long-term relative rotation with the stud 4, thereby extending the service life of the fixed sleeve 1.

[0025] In addition, the central axis of the stud 4 is parallel to the central axis of the fixing sleeve 1 to ensure that the moving direction of the stud 4 is the same as the moving direction of the mold sleeve 2 during rotation.

[0026] An operating portion 42 is provided at one end of the stud 4 opposite to the connecting section 41, and the operating portion 42 can be used by the user to rotate the stud 4. In this embodiment, the operating portion 42 is a nut fixedly connected to the stud 4, and the user can rotate the nut by a wrench to drive the stud 4 to rotate. Of course, the operating portion 42 can also be a slot or a cross slot provided at one end of the stud 4, and the user can rotate the stud 4 by a corresponding screwdriver; of course, the operating portion 42 can also be a manual knob connected to the end of the stud 4, and the user can rotate the stud 4 by hand by the manual knob, and the specific structure of the operating portion 42 is not limited here.

[0027] A feed groove 12 is provided on the side wall of the fixed sleeve 1, and the feed groove 12 is connected to the injection channel 30. During operation, the molten plastic enters the injection channel 30 through the feed groove 12. In specific implementation, there are multiple feed grooves 12, and they are evenly distributed along the circumference of the fixed sleeve 1 to improve the uniformity of feeding. In a preferred embodiment, the feed groove 12 is a long groove with a waist-shaped structure, and the length direction of the feed groove 12 is arranged along the axial direction of the fixed sleeve 1.

[0028] The mold sleeve 2 and the mold core 3 are both through-connected at both ends and are coaxially arranged so that the cable can pass through the mold core 3 and the mold sleeve 2 in sequence. In this embodiment, an inner conical groove 21 is provided at one end of the mold sleeve 2 close to the mold core 3, and the inner conical groove 21 is connected to the inner cavity of the mold sleeve 2. An outer cone 311 is convexly formed at one end of the mold core body 31 close to the mold sleeve 2, and the space sandwiched between the groove wall of the inner conical groove 21 and the conical surface of the outer cone 311 constitutes the injection channel 30. The distance between the bottom of the inner conical groove 21 and the end of the outer cone 311 is the mold spacing H.

[0029] In addition, the groove wall of the inner conical groove 21 and the end face of the mold sleeve 2 are smoothly transitioned, and the outer cone 311 and the end face of the mold core body 31 are smoothly transitioned, which reduces the flow resistance of the molten plastic, facilitates the molten plastic to continuously and smoothly enter the die head, and improves the extrusion effect.

[0030] Furthermore, in order to improve the user experience, a positioning column 22 is provided on the end surface of the mold sleeve 2 away from the mold core 3 along the axial direction of the mold sleeve 2. The positioning column 22 cooperates with the central hole wall of the fixed edge 11, and the positioning column 22 can move relative to the fixed edge 11 under the drive of the mold sleeve 2. Scale lines are provided on the outer wall of the positioning column 22 along the axial direction of the positioning column 22. The user can determine the moving distance of the mold sleeve 2 by observing the alignment relationship between the outer end surface of the fixed edge 11 and the scale lines, which helps the user to quickly move the mold sleeve 2 into place.

[0031] The fixing ring 32 is a circular ring structure, and the outer diameter of the fixing ring 32 is the same as the outer diameter of the fixing sleeve 1, and the end face of the fixing ring 32 fits the end face of the fixing sleeve 1. In specific implementation, the fixing ring 32 and the core body 31 are an integrally formed structure, which is convenient for production and can also control production costs. In this embodiment, the fixing ring 32 and the fixing sleeve 1 are fixedly connected by bolts 6 to fix the core 3 on the fixing sleeve 1.

[0032] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without departing from the scope of the utility model through the above description. The technical scope of this utility model is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A die head for an extruder for cable production, characterized in that: It includes a fixed sleeve, a mold sleeve and a mold core, one end of the fixed sleeve is provided with a fixed edge protruding radially inward, the mold sleeve is slidably arranged in the fixed sleeve along the axial direction of the fixed sleeve, the mold core includes a mold core body and a fixed ring connected to each other, the mold core body is arranged in the fixed sleeve, an injection channel is formed between the mold core body and the mold sleeve, the fixed ring is fixedly connected to the end face of the fixed sleeve away from the fixed edge, a stud is installed on the fixed edge, the stud passes through the fixed edge and is threadedly connected to the fixed edge, and one end of the stud is rotatably connected to the mold sleeve.

2. The extruder die head for cable production as claimed in claim 1, characterized in that: A bearing is installed on the end surface of the mold sleeve close to the fixed edge, the outer ring of the bearing is interference fit with the mold sleeve, and a smooth connecting section is protruded along the bearing at one end of the stud, and the connecting section is interference fit with the inner ring of the bearing.

3. The extruder die head for cable production as claimed in claim 2, characterized in that: A bushing is fixedly mounted on the fixed edge, a threaded hole is provided on the bushing, and the stud is threadedly connected with the threaded hole.

4. The extruder die head for cable production as claimed in claim 2, characterized in that: An operating portion is provided at one end of the stud opposite to the connecting section.

5. The extruder die head for cable production as claimed in claim 1, characterized in that: A positioning column is protruded along the axial direction of the mold sleeve on the end surface of the mold sleeve away from the mold core. The positioning column cooperates with the central hole wall of the fixed edge and can move relative to the fixed edge driven by the mold sleeve.

6. The extruder die head for cable production as claimed in claim 5, characterized in that: The outer wall of the positioning column is provided with scale lines along the axial direction of the positioning column.

7. The extruder die head for cable production as claimed in claim 1, characterized in that: A feed groove is provided on the side wall of the fixing sleeve, and the feed groove is communicated with the injection channel.

8. The extruder die head for cable production as claimed in claim 1, characterized in that: An inner conical groove is formed at one end of the mold sleeve close to the mold core, and the inner conical groove is connected to the inner cavity of the mold sleeve. An outer conical portion is convexly formed on one end of the mold core body close to the mold sleeve, and the injection channel is formed by the space sandwiched between the groove wall of the inner conical groove and the conical surface of the outer conical portion.

9. The extruder die head for cable production as claimed in claim 8, characterized in that: The groove wall of the inner conical groove is smoothly transitionally connected to the end surface of the mold sleeve, and the outer conical portion is smoothly transitionally connected to the end surface of the mold core body.

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