Extruder die head assembly for producing plastic wire protection tube

Abstract

The invention is suitable for the technical field of extruder die heads, and provides an extruder die head assembly for producing a plastic wire protection tube. A connecting ring; the rotating ring sleeve is fixedly mounted at the rear end of the connecting ring, and a rotating structure is arranged on the surface of the rotating ring sleeve; the extrusion head is arranged on the front side of the connecting ring, and connecting screw holes are formed in the surface of the extrusion head in a circumferential array manner; the through holes are formed in the surface of the connecting ring in a circumferential array manner and are aligned with the connecting screw holes; and the connecting bolts are movably inserted into the connecting screw holes and the through holes. Compared with the prior art, the extrusion head has the beneficial effects that when the extrusion head is used, the rotating structure capable of synchronously driving all connecting bolts placed in the connecting screw holes and the through holes in the surfaces of the connecting ring and the extrusion head to be in synchronous rotating connection is arranged on the connecting seat, so that the time required for mounting and replacing one by one in the past is avoided; and the installation and replacement process is simpler and more convenient.

Description

Technical Field

[0001] The present invention belongs to the technical field of extruder dies, and particularly relates to an extruder die assembly for producing plastic wire sheaths. Background Art

[0002] The extruder die is an important component of a plastic extruder, also known as an extrusion die or an extrusion head, and is the forming part of a plastic extruder.

[0003] When installing the extruder die, in order to ensure the installation stability, a bolt-and-nut combination is often used to connect the extruder die to the extruder. However, due to the large number of connection positions, the installation process is rather cumbersome, one by one, and it is not convenient to replace the extruder die later.

[0004] Therefore, how to provide an extruder die assembly for producing plastic wire sheaths is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of the present invention is to provide an extruder die assembly for producing plastic wire sheaths, aiming to solve the problems mentioned in the background art.

[0006] The present invention is realized as follows. An extruder die assembly for producing plastic wire sheaths includes:

[0007] A connecting ring;

[0008] A connecting seat, which is fixedly installed at the rear end of the connecting ring and is provided with a rotating structure on its surface;

[0009] An extrusion head, which is arranged on the front side of the connecting ring and is provided with connecting screw holes circumferentially arrayed on its surface;

[0010] Through holes, which are circumferentially arrayed on the surface of the connecting ring and are aligned with the connecting screw holes;

[0011] Connecting bolts, which are movably inserted into the connecting screw holes and the through holes and are meshed with the rotating structure.

[0012] Preferably, a central positioning column is arranged in the middle of the extrusion head. An additional ring cylinder is sleeved on the surface of the central positioning column in an array. The radian value at the rear end corresponds to the radian value at the rear end of the central positioning column. A clamping structure is arranged at the rear ends of the central positioning column and the additional ring cylinder to restrict the position of the rear end of the additional ring cylinder. A limiting structure is arranged at the front end of the central positioning column to restrict the position of the front end of the additional ring cylinder;

[0013] The clamping structure includes a clamping groove and a convex block. The clamping grooves are arranged in a circumferential array at the bottom of the rear end of the extrusion head, and the convex blocks are installed in a circumferential array at the top of the center positioning column and the rear end of the additional ring cylinder, and are movably clamped with the clamping grooves.

[0014] Preferably, an air extraction structure is further arranged on the surface of the extrusion head. The air extraction structure includes an air extraction ring pipe, a groove and an air extraction pipe. The air extraction ring pipe is fixedly installed on the front side of the surface of the extrusion head. The groove is opened at the left end of the front side of the surface of the extrusion head. The air extraction pipe is movably placed inside the groove and is fixedly connected to the rear end of the air extraction ring pipe.

[0015] Preferably, the rotating structure includes a sliding groove and a toothed ring. The sliding groove is opened on the surface of the connecting seat. The toothed ring is slidably arranged inside the sliding groove. The surface of the toothed ring is meshed and connected with the connecting bolt. A rotating ring sleeve is fixedly installed at the rear side of the toothed ring.

[0016] Preferably, the limiting structure includes a center positioning column, a slider, a center toothed roller and a baffle. Activity grooves are arranged in a circumferential array in the middle of the front end of the center positioning column. Slide rails are arranged in a circumferential array at the front end of the activity grooves. The center toothed roller is movably installed in the middle of the activity grooves and penetrates through the surface of the center positioning column at the front end and is fixedly connected with an adjustment knob. Traction rack bars are arranged in a circumferential array and are offset inside the activity grooves and are all in transmission connection with the center toothed roller at the inner side. The slider is slidably arranged in the middle of the slide rails and the rear end is fixedly connected with the front side of the traction rack bar. The baffles are arranged in a circumferential array on the surface of the slider and the rear sides of the inner ends are fixedly connected with the baffles.

[0017] Preferably, a check ratchet is movably arranged at the rear side of the connecting ring, and the lower end of the check ratchet is movably inserted into the rotating structure.

[0018] Preferably, a tooth groove corresponding to the rotating structure is arranged at the rear end of the connecting bolt, and a thread screwed with the connecting screw hole is arranged at the front end of the connecting bolt.

[0019] Preferably, a filter screen is arranged between the connecting ring and the extrusion head. Electric heating tubes are inserted in a circumferential array on the surface of the connecting ring and are in movable abutment with the side surface of the filter screen.

[0020] Preferably, the diameter value of the connecting bolt is equal to the inner diameter values of the connecting screw hole and the through hole, and the length value of the connecting bolt is greater than the length values of the connecting screw hole and the through hole.

[0021] Compared with the prior art, the beneficial effect of the present invention is that during use, by arranging a rotating structure on the connecting seat that can synchronously drive all the connecting bolts placed in the connecting screw holes and through holes on the surfaces of the connecting ring and the extrusion head to rotate and connect synchronously, the time required for the previous individual installation and replacement is avoided, making the installation and replacement process more concise and convenient;

[0022] By movably sleeving different numbers of additional annular cylinders on the central positioning post to change the distance between the central positioning post and the extrusion head, and setting a clamping structure and a limiting structure to limit the front and rear ends of both the central positioning post and the additional annular cylinders, the additional annular cylinders and the central positioning post can form an integral body, and then, without affecting the normal production of plastic pipes, the purpose of changing the wall thickness of the final plastic pipes according to requirements can be achieved;

[0023] At the same time, by arranging an air extraction structure at the front end of the surface of the extrusion head, the harmful gases generated by the melting of the plastic can be pumped to a designated place for purification, thus avoiding the situation where the environment is polluted and the health of the staff is affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0025] Figure 1 is a schematic diagram of the overall appearance structure of an extrusion die head assembly for producing plastic wire protection pipes provided by an embodiment of the present invention;

[0026] Figure 2 is a schematic diagram of the top view structure of an extrusion die head assembly for producing plastic wire protection pipes provided by an embodiment of the present invention;

[0027] Figure 3 is a schematic diagram of the main view sectional structure of an extrusion die head assembly for producing plastic wire protection pipes provided by an embodiment of the present invention;

[0028] Figure 4 is a schematic diagram of the right view sectional structure of an extrusion die head assembly for producing plastic wire protection pipes provided by an embodiment of the present invention;

[0029] Figure 5 is a schematic diagram of the main view sectional structure of a central positioning post for producing plastic wire protection pipes provided by an embodiment of the present invention;

[0030] Figure 6 is provided by an embodiment of the present invention Figure 1 The enlarged structure schematic diagram of part A;

[0031] Figure 7 is provided by an embodiment of the present invention Figure 4 The enlarged structure schematic diagram of part B;

[0032] Figure 8 is provided by an embodiment of the present invention Figure 4 The enlarged structure schematic diagram of part C;

[0033] Figure 9 provided by the embodiment of the present invention Figure 4 Schematic diagram of the enlarged structure of part D

[0034] In the figure: 1 - connecting ring, 2 - extrusion head, 3 - connecting bolt, 4 - connecting seat, 5 - chute, 6 - toothed ring, 7 - rotating ring sleeve, 8 - through hole, 9 - connecting screw hole, 10 - filter screen, 11 - electric heating tube, 12 - check ratchet, 13 - air extraction ring pipe, 14 - groove, 15 - air extraction pipe, 16 - central positioning column, 17 - additional ring cylinder, 18 - clamping groove, 19 - convex block, 20 - movable groove, 21 - slide rail, 22 - slider, 23 - traction rack, 24 - central gear roller, 25 - adjustment knob, 26 - baffle plate Specific embodiments

[0035] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention

[0036] The following describes the specific implementation of the present invention in detail with reference to specific embodiments

[0037] As shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 shown, it is a schematic diagram of the structure of an extrusion die head assembly for producing plastic wire protection tubes provided by an embodiment of the present invention, including;

[0038] Connecting ring 1;

[0039] Connecting seat 4, the connecting seat 4 is fixedly installed at the rear end of the connecting ring 1 and is provided with a rotating structure on the surface;

[0040] Extrusion head 2, the extrusion head 2 is arranged on the front side of the connecting ring 1, and connecting screw holes 9 are circumferentially and arrayedly opened on the surface;

[0041] Through holes 8, the through holes 8 are circumferentially and arrayedly opened on the surface of the connecting ring 1 and are aligned with the connecting screw holes 9;

[0042] Connecting bolts 3, the connecting bolts 3 are movably inserted into the connecting screw holes 9 and the through holes 8 and are meshed and connected with the rotating structure

[0043] In an embodiment of the present invention, when in use, the connecting seat 4 at the rear end of the connecting ring 1 is installed at the outlet of the extruder. Subsequently, the extrusion head 2 is aligned with the connecting ring 1, and the connecting screw holes 9 on its surface are aligned with the through holes 8 on the surface of the connecting ring 1. Then, the connecting bolts 3 are inserted into the connecting screw holes 9 and the through holes 8, and the rear ends thereof are engaged with the rotating structure. Subsequently, by rotating the rotating structure, the connecting bolts 3 are caused to rotate accordingly, so that the connection degree between the connecting bolts 3 and the connecting screw holes 9 is deepened, and further the connecting ring 1 and the extrusion head 2 are connected together;

[0044] By providing a rotating structure on the connecting seat 4 that can synchronously drive all the connecting bolts 3 placed in the connecting screw holes 9 and the through holes 8 on the surfaces of the connecting ring 1 and the extrusion head 2 to rotate synchronously, the time required for the previous one-by-one installation and replacement is avoided, making the installation and replacement process more concise and convenient.

[0045] Such as Figure 1 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 8 and Figure 9 As shown in, as a preferred embodiment of the present invention, a central positioning column 16 is provided in the middle of the extrusion head 2. The surface of the central positioning column 16 is arrayed and sleeved with additional ring cylinders 17, and the radian value at the rear end corresponds to the radian value at the rear end of the central positioning column 16. A clamping structure is provided at the rear ends of the central positioning column 16 and the additional ring cylinders 17 to restrict the position of the rear end of the additional ring cylinders 17, and a limiting structure is provided at the front end of the central positioning column 16 to restrict the position of the front end of the additional ring cylinders 17;

[0046] The clamping structure includes a clamping groove 18 and a convex block 19. The clamping grooves 18 are circumferentially arrayed and opened at the bottom of the rear end of the extrusion head 2, and the convex blocks 19 are circumferentially arrayed and installed at the top of the rear ends of the central positioning column 16 and the additional ring cylinders 17 and are movably clamped with the clamping grooves 18.

[0047] In an embodiment of the present invention, when it is necessary to change the distance between the front end of the central positioning column 16 and the extrusion head 2 so that the thickness of the extruded plastic changes correspondingly, different numbers of additional ring cylinders 17 are correspondingly placed on the surface of the central positioning column 16, and the clamping grooves 18 at the rear ends of the additional ring cylinders 17 are clamped with the convex blocks 19 on the surface of the lower additional ring cylinder 17 or the central positioning column 16. Subsequently, the limiting structure works to limit the front side of the additional ring cylinder 17, so that the additional ring cylinder 17 and the central positioning column 16 form an integral body, thereby achieving the purpose of changing the wall thickness of the final plastic pipe.

[0048] Such as Figure 1As shown, as a preferred embodiment of the present invention, an air extraction structure is further provided on the surface of the extrusion head 2. The air extraction structure includes an air extraction ring pipe 13, a groove 14, and an air extraction pipe 15. The air extraction ring pipe 13 is fixedly installed on the front side of the surface of the extrusion head 2. The groove 14 is opened at the left end of the front side of the surface of the extrusion head 2. The air extraction pipe 15 is movably placed inside the groove 14 and is fixedly connected to the rear end of the air extraction ring pipe 13.

[0049] In the embodiment of the present invention, when in use, the air extraction ring pipe 13 is installed at the front end of the surface of the extrusion head 2, and then the air extraction pipe 15 is placed in the groove 14 at the front end of the extrusion head 2, and then connected to the air extraction ring pipe 13. Then the other end is connected to an air extraction device with a filtering medium, so that the harmful gases generated by the melting of the plastic can be pumped to a designated place for purification, thus avoiding environmental pollution and affecting the health of the staff.

[0050] As Figure 1 、 Figure 2 、 Figure 4 and Figure 7 shown, as a preferred embodiment of the present invention, the rotation structure includes a sliding groove 5 and a toothed ring 6. The sliding groove 5 is opened on the surface of the connecting seat 4. The toothed ring 6 is slidably arranged inside the sliding groove 5. The surface of the toothed ring 6 is meshed and connected with the connecting bolt 3. A rotating ring sleeve 7 is fixedly installed at the rear side of the toothed ring 6.

[0051] In the embodiment of the present invention, when in use, by rotating the rotating ring sleeve 7, the toothed ring 6 in the sliding groove 5 is driven to rotate, and then the connecting bolt 3 is driven to rotate, so that the connecting ring 1 and the extrusion head 2 are connected together.

[0052] As Figure 1 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 8 shown, as a preferred embodiment of the present invention, the limiting structure includes a central positioning column 16, a slider 22, a central toothed roller 24, and a baffle 26. An activity groove 20 is circumferentially arrayed in the middle of the front end of the central positioning column 16. A slide rail 21 is circumferentially arrayed at the front end of the activity groove 20. The central toothed roller 24 is movably installed in the middle of the activity groove 20 and the front end penetrates through the surface of the central positioning column 16 and is fixedly connected with an adjustment knob 25. Traction toothed rods 23 are circumferentially arrayed and misaligned inside the activity groove 20 and the inner sides are all drivingly connected with the central toothed roller 24. The slider 22 is slidably arranged in the middle of the slide rail 21 and the rear end is fixedly connected with the front side of the traction toothed rod 23. The baffle 26 is circumferentially arrayed on the surface of the slider 22 and the rear side of the inner end is fixedly connected with the baffle 26.

[0053] In an embodiment of the present invention, when in use, rotate the adjustment knob 25, and drive the traction tooth bars 23 arranged in a circumferentially staggered manner in the movable groove 20 to move synchronously through the central tooth roller 24 connected to its rear, thereby driving the slider 22 in the slide rail 21 at its top to slide outward. Finally, the baffle 26 on the front side of the central positioning column 16 is driven by the slider 22 to limit the front side of the additional ring cylinder 17, so that the additional ring cylinder 17 and the central positioning column 16 form an integral body, and thus, with the cooperation of the clamping structure, the purpose of changing the wall thickness of the final plastic pipe is achieved.

[0054] As Figure 2 shown, as a preferred embodiment of the present invention, a check pawl 12 is movably arranged at the rear side of the connecting ring 1, and the lower end of the check pawl 12 is movably inserted into the rotating structure.

[0055] In an embodiment of the present invention, when in use, by movably arranging a check pawl 12 at the rear side of the connecting ring 1 and making the lower end of the check pawl 12 movably inserted into the rotating structure, the rotation direction of the rotating structure is restricted, and the situation of rotation is avoided.

[0056] As Figure 4 and Figure 7 shown, as a preferred embodiment of the present invention, a tooth groove corresponding to the rotating structure is arranged at the rear end of the connecting bolt 3, and a thread for helically connecting with the connecting screw hole 9 is arranged at the front end of the connecting bolt 3.

[0057] In an embodiment of the present invention, when in use, by arranging a tooth groove corresponding to the rotating structure at the rear end of the connecting bolt 3, and then arranging a thread for helically connecting with the connecting screw hole 9 at the front end of the connecting bolt 3, the rear end of the connecting bolt 3 is first meshed with the rotating structure, and then connected with the connecting screw hole 9, thereby facilitating the rotating structure to drive the connecting bolt 3 to be connected with the corresponding connecting screw hole 9.

[0058] As Figure 2 , Figure 3 and Figure 4 shown, as a preferred embodiment of the present invention, a filter screen 10 is arranged between the connecting ring 1 and the extrusion head 2, and electric heating tubes 11 are inserted in a circumferential array on the surface of the connecting ring 1 and are in movable abutment with the side surface of the filter screen 10.

[0059] In an embodiment of the present invention, when in use, by arranging a filter screen 10 between the connecting ring 1 and the extrusion head 2, and then inserting electric heating tubes 11 in a circumferential array on the surface of the connecting ring 1 and being in movable abutment with the side surface of the filter screen 10, the filter screen 10 can be heated to melt and flow out the plastic remaining on its surface.

[0060] As Figure 1 , Figure 2 ,Figure 3 , Figure 4 and Figure 7 As shown in Figure 3 , Figure 4 and Figure 7 , as a preferred embodiment of the present invention, the diameter value of the connecting bolt 3 is equal to the inner diameter values of the connecting screw hole 9 and the through hole 8, and the length value of the connecting bolt 3 is greater than the length values of the connecting screw hole 9 and the through hole 8.

[0061] In the embodiment of the present invention, when in use, by making the diameter value of the connecting bolt 3 equal to the inner diameter values of the connecting screw hole 9 and the through hole 8, and the length value of the connecting bolt 3 greater than the length values of the connecting screw hole 9 and the through hole 8, it is convenient to connect the connecting bolt 3 with the connecting screw hole 9 and insert the through hole 8.

[0062] In the above embodiment of the present invention, an extrusion die head assembly for producing plastic wire sheaths is provided. When in use, the connecting seat 4 at the rear end of the connecting ring 1 is installed at the outlet of the extruder, and then the extrusion head 2 is aligned with the connecting ring 1, and the connecting screw hole 9 on its surface is aligned with the through hole 8 on the surface of the connecting ring 1. Then, the connecting bolt 3 is inserted into the connecting screw hole 9 and the through hole 8, and its rear end is engaged with the toothed ring 6. Then, the toothed ring 6 is rotated by rotating the ring sleeve 7, and then the connecting bolt 3 rotates accordingly, so that the connection degree between the connecting bolt 3 and the connecting screw hole 9 is deepened, and the meshing depth between the connecting bolt 3 and the toothed ring 6 is increased. Thus, with the cooperation of the check pawl 12, the connecting ring 1 and the extrusion head 2 are connected together;

[0063] Subsequently, the air extraction ring pipe 13 is installed at the front end of the surface of the extrusion head 2, and then the air extraction pipe 15 is placed in the groove 14 at the front end of the extrusion head 2, and then connected to the air extraction ring pipe 13, and the other end is connected to an air extraction device with a filtering medium, so that the harmful gases generated by the melting of the plastic can be pumped to a designated place for purification, thus avoiding the situation of environmental pollution and affecting the health of the staff;

[0064] When it is necessary to change the distance between the central positioning column 16 and the front end of the extrusion head 2 so that the thickness of the extruded plastic changes correspondingly, the corresponding number of additional ring cylinders 17 are placed on the surface of the central positioning column 16, and the card slots 18 at the rear ends of the additional ring cylinders 17 are engaged with the bumps 19 on the surface of the lower additional ring cylinder 17 or the central positioning column 16. Then, the adjustment knob 25 is rotated, and the traction tooth rods 23 arranged in a circumferentially offset manner in the movable groove 20 are driven to move synchronously by the central gear roller 24 connected to its rear, and then the slider 22 in the top slide rail 21 is driven to slide outward. Finally, the baffle 26 on the front side of the central positioning column 16 limits the front side of the additional ring cylinder 17 under the drive of the slider 22, so that the additional ring cylinder 17 and the central positioning column 16 form a whole, thus achieving the purpose of changing the wall thickness of the final plastic pipe.

[0065] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. An extruder die assembly for producing a plastic wire protection tube, characterized in that: include; Connecting ring (1); A connecting seat (4), the connecting seat (4) is fixedly mounted on the rear end of the connecting ring (1) and has a rotating structure on its surface; An extrusion head (2), the extrusion head (2) being arranged on the front side of the connection ring (1) and having a circumferential array of connection screw holes (9) formed on its surface; Through holes (8), the through holes (8) are arranged in a circumferential array on the surface of the connecting ring (1) and are aligned with the connecting screw holes (9); A connecting bolt (3) is movably inserted into the connecting screw hole (9) and the through hole (8) and is meshedly connected with the rotating structure.

2. The extruder die head assembly for producing a plastic wire protection tube according to claim 1, characterized in that: A central positioning column (16) is provided in the middle of the extrusion head (2); an additional ring tube (17) is sleeved on the surface array of the central positioning column (16); and the arc value of the rear end is set corresponding to the arc value of the rear end of the central positioning column (16); a clamping structure is provided at the rear ends of the central positioning column (16) and the additional ring tube (17) to constrain the position of the rear end of the additional ring tube (17); and a limiting structure is provided at the front end of the central positioning column (16) to constrain the position of the front end of the additional ring tube (17); The clamping structure comprises a clamping groove (18) and a protrusion (19). The clamping groove (18) is arranged in a circular array at the bottom of the rear end of the extruder head (2). The protrusion (19) is installed in a circular array at the top of the rear end of the central positioning column (16) and the additional ring cylinder (17) and is movably clamped with the clamping groove (18).

3. The extruder die head assembly for producing a plastic wire protection tube according to claim 1, characterized in that: The surface of the extruder head (2) is also provided with an exhaust structure, which comprises an exhaust ring tube (13), a groove (14) and an exhaust pipe (15). The exhaust ring tube (13) is fixedly mounted on the front side of the surface of the extruder head (2), the groove (14) is opened at the left end of the front side of the surface of the extruder head (2), and the exhaust pipe (15) is movably placed inside the groove (14) and fixedly connected to the rear end of the exhaust ring tube (13).

4. The extruder die head assembly for producing a plastic wire protection tube according to claim 1, characterized in that: The rotating structure comprises a slide groove (5) and a gear ring (6); the slide groove (5) is provided on the surface of the connecting seat (4); the gear ring (6) is slidably arranged inside the slide groove (5); the surface of the gear ring (6) is meshedly connected with the connecting bolt (3); and a rotating ring sleeve (7) is fixedly installed on the rear side of the gear ring (6).

5. The extruder die head assembly for producing plastic wire protection tube according to claim 2, characterized in that: The limiting structure comprises a central positioning column (16), a slider (22), a central toothed roller (24) and a baffle (26); a movable groove (20) is provided in a circular array in the middle of the front end of the central positioning column (16); a slide rail (21) is provided in a circular array in the front end of the movable groove (20); the central toothed roller (24) is movably installed in the middle of the movable groove (20), and the front end thereof penetrates the surface of the central positioning column (16) and is fixedly connected with an adjustment knob (25); a traction toothed rod (23) is staggeredly arranged in the inner circular array of the movable groove (20), and the inner side thereof is transmission-connected with the central toothed roller (24); the slider (22) is slidably arranged in the middle of the slide rail (21), and the rear end thereof is fixedly connected with the front side of the traction toothed rod (23); the baffle (26) is arranged in a circular array on the surface of the slider (22), and the rear side of the inner end is fixedly connected with the baffle (26).

6. The extruder die head assembly for producing a plastic wire protection tube according to claim 1, characterized in that: A non-return pawl (12) is movably provided on the rear side of the connecting ring (1), and the lower end of the non-return pawl (12) is movably plugged into the rotating structure.

7. The extruder die head assembly for producing plastic wire protection tube according to claim 1, characterized in that: The rear end of the connecting bolt (3) is provided with a tooth groove corresponding to the rotating structure, and the front end of the connecting bolt (3) is provided with a thread that is spirally connected to the connecting screw hole (9).

8. The extruder die head assembly for producing plastic wire protection tube according to claim 1, characterized in that: A filter screen (10) is arranged between the connecting ring (1) and the extrusion head (2); electric heating tubes (11) are inserted into a circular array on the surface of the connecting ring (1) and are movably abutted against the side of the filter screen (10).

9. The extruder die head assembly for producing plastic wire protection tube according to claim 1, characterized in that: The diameter of the connecting bolt (3) is equal to the inner diameter of the connecting screw hole (9) and the through hole (8), and the length of the connecting bolt (3) is greater than the length of the connecting screw hole (9) and the through hole (8).

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