Extruding machine for cable production with adjustable screen plate hole area

Abstract

The present application relates to the technical field of plastic extruders, in particular to an extruder with adjustable filter screen hole area for cable production. The extruder comprises a heating body and an extruding body, and is provided with a discharge head at one end and a filter screen plate at the discharge head. In the present application, when the motor drives the first screw to rotate forward to push the plastic melt in the barrel, the clamping plate slides along the inclined surface of the triangular body, and the first screw cannot drive the connecting rod to rotate, so the inner filter plate cannot rotate in the outer filter plate. When it is necessary to adjust the hole area of the filter screen plate, the motor drives the first screw to rotate reversely, so that the clamping plate clamps the triangular body, and the first screw drives the connecting rod to further drive the inner filter plate to rotate in the outer filter plate, thereby facilitating the adjustment of the hole area of the filter screen plate.

Description

Technical Field

[0001] This invention relates to the field of plastic extruder technology, and more specifically, to an extruder for cable production with adjustable filter screen aperture area. Background Technology

[0002] Cables are electrical products used to transmit electricity, transmit signals, or convert electromagnetic energy. A cable consists of a conductive core for transmitting electrical energy, an insulating layer for isolating electrical components, and a protective layer for sealing and protection. The insulating and protective layers are made of plastic and are generally produced by an extruder.

[0003] An extruder is a plastic production machine that uses extrusion molding to produce plastics. An extruder includes a barrel, a motor, an extrusion screw, and a filter screen. The barrel heats the plastic raw material, and the motor drives the extrusion screw to extrude and shape the molten plastic. The filter screen is used to impede the flow of the molten plastic, increasing the flow pressure to produce dense plastic products. Existing extruders require stopping the machine to disassemble and replace filter screens with corresponding aperture areas when producing different specifications of plastic products. This installation and disassembly process is cumbersome and hinders rapid production. Therefore, a cable production extruder with an adjustable filter screen aperture area is proposed. Summary of the Invention

[0004] The purpose of this invention is to provide an extruder for cable production with an adjustable filter screen aperture area, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides an extruder for cable production with an adjustable filter screen aperture area, comprising an extruder, the extruder including a barrel and a platform disposed at the bottom of the barrel, a hopper connected to the top of one end of the barrel, an inner groove formed in the inner wall of the barrel, a heating element disposed in the inner groove for heating the barrel, an extruder rotatably connected inside the barrel, a motor disposed at the top of the platform near the hopper, the motor being drivenly connected to one end of the extruder via a coupling, a discharge head disposed at the end of the barrel away from the hopper, a filter screen disposed between the discharge head and the barrel, the filter screen including an outer filter plate and an inner filter plate, an adjusting groove formed in the outer filter plate, the inner filter plate being rotatably connected to the adjusting groove, a transmission structure connected at the end of the inner filter plate away from the discharge head, and the other end of the transmission structure being connected to the end of the extruder near the discharge head.

[0006] As a further improvement to this technical solution, the extruder includes a first screw with one end connected to the coupling, the other end of the first screw connected to the transmission structure, the first screw having an end cone on its surface near the coupling inside the barrel, and a second screw between the first screw and the end cone.

[0007] As a further improvement to this technical solution, the transmission structure includes a connecting rod and an end sleeve. One end of the connecting rod is connected to the middle of the surface of the inner filter plate away from the discharge head. The end sleeve is connected to the end of the first screw away from the second screw. The other end of the connecting rod has symmetrically opened end grooves. A snap-fit ​​body is provided in the end groove. The snap-fit ​​body includes a snap plate and a spring set at the bottom of the snap plate. The snap plate is connected to the inner surface of the end groove through the spring. The inner surface of the end sleeve has multiple triangular bodies. The snap plate contacts the surface of the triangular bodies.

[0008] As a further improvement to this technical solution, a friction pad is provided near the edge of the adjustment groove, and the inner wall of the friction pad is in contact with the outer wall of the inner filter plate.

[0009] As a further improvement to this technical solution, the friction pad is an elastic washer, and a pressing groove is provided on the edge of the surface of the outer filter plate away from the discharge head. The pressing groove is connected to the adjustment groove. A movable body is provided in the pressing groove. The movable body includes a diaphragm connected to the outer side of the inner surface of the pressing groove. A trapezoidal block is provided on the side of the diaphragm near the friction pad.

[0010] As a further improvement to this technical solution, the top of the inner filter plate is provided with an indicator needle, which passes through the outer filter plate and the discharge head. The top of the discharge head is provided with an indicator plate, and the surface of the indicator plate is provided with scale lines.

[0011] As a further improvement to this technical solution, the outer filter plate is symmetrically provided with a plurality of fixing rods on the surface near the discharge head, and a fixing groove is correspondingly opened in the discharge head. The fixing rods are located in the fixing grooves and are inserted into the fixing grooves.

[0012] As a further improvement to this technical solution, the heating element includes multiple induction coils located in the inner groove, and the induction coils are provided with a heat insulation sleeve on the outer side.

[0013] As a further improvement to this technical solution, the discharge head is provided with symmetrical side rods on both sides, and the material cylinder is provided with symmetrical slots on the surface of the side near the discharge head. The side rods pass through the slots, and the top of the material cylinder is provided with a top plate. A bolt is rotatably connected to the middle of the top plate. The bolt is threaded to the top of the material cylinder, and the two ends of the bottom of the top plate are located in the slots. The two ends of the bottom of the top plate are engaged with the side rods.

[0014] As a further improvement to this technical solution, a cooling groove is provided on the inner wall of the discharge head, a heat-conducting ring is provided in the cooling groove, fins are provided on the surface of the heat-conducting ring, and a ventilation opening is provided on the outer surface of the discharge head, which is connected to the cooling groove.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. In the cable extruder with adjustable filter screen area, a transmission structure is provided. When the motor drives the first screw to rotate forward and push the molten plastic in the barrel, the clamping plate slides along the inclined surface of the triangular body. The first screw cannot drive the connecting rod to rotate. At this time, the inner filter plate will not rotate inside the outer filter plate. When it is necessary to adjust the filter screen area, the motor drives the first screw to rotate in reverse, so that the clamping plate locks the triangular body. At this time, the first screw drives the connecting rod and then drives the inner filter plate to rotate inside the outer filter plate, thereby facilitating the adjustment of the filter screen area.

[0017] 2. In the cable extruder with adjustable filter screen area, a pressing groove and a movable body are provided. When the first screw pushes the molten plastic to be extruded from the discharge head, the pressure of the molten plastic causes the diaphragm to contract towards the inside of the pressing groove, which in turn drives the trapezoidal block to move into the adjusting groove. The friction pad is pressed by the inclined surface of the trapezoidal block and moves towards the surface of the inner filter plate and makes contact. At this time, the friction between the friction pad and the inner filter plate can prevent the inner filter plate from rotating. When the first screw reverses, it cannot push the molten plastic to be extruded from the discharge head, which causes the diaphragm to reset and drives the trapezoidal block to reset. The friction pad moves away from the outer wall of the inner filter plate under its own elasticity. At this time, the first screw reverses and can drive the inner filter plate to rotate inside the outer filter plate through the transmission structure.

[0018] 3. In the cable production extruder with adjustable filter screen mesh area, an extruder is provided. When the motor drives the first screw to rotate through the coupling, the plastic raw material fed from the hopper can fall into the barrel along the inclined surface of the end cone. The plastic raw material falling into the barrel is pushed into the middle of the barrel by the second screw, which facilitates the first screw to push the plastic raw material to the discharge head for extrusion. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a cross-sectional view of the present invention;

[0021] Figure 3 This is a cross-sectional structural diagram of the extruder of the present invention;

[0022] Figure 4 This is a schematic diagram of the barrel structure of the present invention;

[0023] Figure 5 This is a cross-sectional structural diagram of the heating element of the present invention;

[0024] Figure 6 This is a schematic diagram of the extruded body structure of the present invention;

[0025] Figure 7This is a cross-sectional structural diagram of the discharge head of the present invention;

[0026] Figure 8 This is a schematic diagram of the disassembled structure of the filter plate of the present invention;

[0027] Figure 9 This is a cross-sectional view of the outer plate structure of the present invention;

[0028] Figure 10 This is a cross-sectional structural diagram of the inner plate of the present invention.

[0029] The meanings of the labels in the diagram are as follows:

[0030] 11. Extruder; 111. Barrel; 112. Table; 113. Hopper; 114. Inner groove; 115. Slot; 116. Top plate; 117. Bolt;

[0031] 12. Heating element; 121. Induction coil; 122. Heat insulation sleeve;

[0032] 13. Extruded body; 131. First screw; 132. End taper; 133. Second screw;

[0033] 14. Discharge head; 141. Side rod; 142. Indicator plate; 143. Fixing groove; 144. Heat-conducting ring;

[0034] 15. Filter screen plate; 151. External filter plate; 152. Internal filter plate; 1521. Indicator needle; 153. Adjustment groove; 154. Friction pad; 155. Fixing rod; 156. Pressing groove; 157. Movable body; 158. Connecting rod; 1581. Snap-fit ​​body; 159. End sleeve. Detailed Implementation

[0035] 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.

[0036] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0038] Example 1

[0039] Please see Figures 1-10 As shown, the purpose of this embodiment is to provide an extruder for cable production with an adjustable filter screen aperture area, including an extruder 11. The extruder 11 includes a barrel 111 and a platform 112 disposed at the bottom of the barrel 111. A hopper 113 is connected to the top of one end of the barrel 111. An inner groove 114 is formed on the inner wall of the barrel 111, and a heating element 12 is disposed in the inner groove 114. The heating element 12 is used to heat the barrel 111 to melt the plastic raw material inside the barrel 111. An extruder 13 is rotatably connected inside the barrel 111. A motor is disposed at the top of the platform 112 near the hopper 113. The motor is connected to one end of the extruder 13 via a coupling. A discharge head 1 is disposed at the end of the barrel 111 away from the hopper 113. 4. A filter plate 15 is provided between the discharge head 14 and the barrel 111. The filter plate 15 includes an outer filter plate 151 and an inner filter plate 152. An adjustment groove 153 is provided in the outer filter plate 151. The inner filter plate 152 is rotatably connected to the adjustment groove 153. A transmission structure is connected to the end of the inner filter plate 152 away from the discharge head 14. The other end of the transmission structure is connected to the end of the extruder 13 near the discharge head 14. The extruder 13 is used to squeeze the plastic melt in the barrel 111 toward the discharge head 14. The extruder 13 drives the inner filter plate 152 to rotate in the outer filter plate 151 through the transmission structure. By overlapping the filter openings of the outer filter plate 151 and the inner filter plate 152, the pore area of ​​the filter plate 15 that allows the plastic melt to pass through can be changed.

[0040] In this embodiment, when the plastic raw material is fed into the first screw 131 via the coupling, the plastic raw material fed from the hopper 113 falls into the barrel 111 along the inclined surface of the end cone 132. The plastic raw material falling into the barrel 111 is pushed into the middle of the barrel 111 by the second screw 133, facilitating the first screw 131 to push the plastic raw material towards the discharge head 14 for extrusion. The heating element 12 heats the barrel 111, causing the plastic raw material to melt. As the molten plastic passes through the filter plate 15, the pressure of the molten plastic causes the diaphragm to contract towards the pressing groove 156, moving the trapezoidal block towards the adjusting groove 153. The friction pad 154 is pressed against the surface of the inner filter plate 152 by the inclined surface of the trapezoidal block and comes into contact with it. At this time, the friction between the friction pad 154 and the inner filter plate 152 can prevent the inner filter plate 152 from rotating. When the molten plastic reaches the discharge head 14, its heat is absorbed by the heat-conducting ring 144. Air flows through the vent and contacts the fins to carry away the heat, thus facilitating the cooling of the molten plastic. When it is necessary to adjust the pore area of ​​the filter screen plate 15, the first screw 131 reverses and does not squeeze out the molten plastic, so that the diaphragm resets and drives the trapezoidal block to reset. The friction pad 154 moves away from the outer wall of the inner filter plate 152 under its own elasticity. At this time, the motor drives the first screw 131 to reverse, so that the clamping plate clamps the triangular body. At this time, the first screw 131 drives the connecting rod 158 and then drives the inner filter plate 152 to rotate inside the outer filter plate 151. The overlap of the filter port of the outer filter plate 151 and the filter port of the inner filter plate 152 facilitates the adjustment of the pore area of ​​the filter screen plate 15.

[0041] In this embodiment, to facilitate the extrusion of the molten plastic in the barrel 111, the extruder 13 includes a first screw 131 connected at one end to a coupling and the other end of the first screw 131 connected to a transmission structure. The first screw 131 is located inside the barrel 111 and has an end cone 132 on its surface near the coupling. A second screw 133 is provided between the first screw 131 and the end cone 132. By providing the extruder 13, when the motor drives the first screw 131 to rotate through the coupling, the plastic raw material fed from the hopper 113 can fall into the barrel 111 along the inclined surface of the end cone 132. The plastic raw material falling into the barrel 111 is pushed into the middle of the barrel 111 by the second screw 133, thereby facilitating the first screw 131 to push the plastic raw material to the discharge head 14 for extrusion.

[0042] To facilitate control and adjustment of the pore area of ​​the filter plate 15, the transmission structure includes a connecting rod 158 and an end sleeve 159. One end of the connecting rod 158 is connected to the middle of the surface of the inner filter plate 152 away from the discharge head 14. The end sleeve 159 is connected to the end of the first screw 131 away from the second screw 133. The other end of the connecting rod 158 has symmetrically opened end grooves. A locking body 1581 is provided in the end groove. The locking body 1581 includes a locking plate and a spring set at the bottom of the locking plate. The locking plate is connected to the inner surface of the end groove through the spring. The inner surface of the end sleeve 159 has multiple triangular bodies. The locking plate and the triangular bodies... With surface contact and a transmission structure, when the motor drives the first screw 131 to rotate forward and push the molten plastic in the barrel 111, the clamping plate slides along the inclined surface of the triangular body. The first screw 131 cannot drive the connecting rod 158 to rotate. At this time, the inner filter plate 152 will not rotate inside the outer filter plate 151. When it is necessary to adjust the pore area of ​​the filter screen plate 15, the motor drives the first screw 131 to rotate in reverse, so that the clamping plate locks the triangular body. At this time, the first screw 131 drives the connecting rod 158 and then drives the inner filter plate 152 to rotate inside the outer filter plate 151, thereby facilitating the adjustment of the pore area of ​​the filter screen plate 15.

[0043] Considering that the pressure of the molten plastic as it passes through the filter plate 15 will cause the inner filter plate 152 to rotate within the outer filter plate 151, a friction pad 154 is provided near the edge of the adjusting groove 153 to prevent the inner filter plate 152 from rotating. The inner wall of the friction pad 154 contacts the outer wall of the inner filter plate 152. The frictional resistance generated by the friction pad 154 in contact with the inner filter plate 152 can prevent the inner filter plate 152 from rotating within the outer filter plate 151 due to the pressure of the molten plastic.

[0044] Considering that the frictional resistance between the friction pad 154 and the inner filter plate 152 will affect the rotation of the inner filter plate 152 driven by the transmission structure, the friction pad 154 is an elastic washer. A pressing groove 156 is provided on the edge of the outer filter plate 151 away from the discharge head 14. The pressing groove 156 is connected to the adjusting groove 153. A movable body 157 is provided inside the pressing groove 156. The movable body 157 includes a diaphragm connected to the outer side of the inner surface of the pressing groove 156. A trapezoidal block is provided on the side of the diaphragm near the friction pad 154. With the pressing groove 156 and the movable body 157, when the first screw 131 pushes the molten plastic to be extruded from the discharge head 14, due to the plastic… The pressure of the melt causes the diaphragm to contract towards the inside of the pressing groove 156, which in turn moves the trapezoidal block towards the adjusting groove 153. The friction pad 154 is pressed against the surface of the inner filter plate 152 by the inclined surface of the trapezoidal block and moves into contact. At this time, the friction between the friction pad 154 and the inner filter plate 152 can prevent the inner filter plate 152 from rotating. When the first screw 131 reverses, it cannot push the plastic melt to be extruded from the discharge head 14, which causes the diaphragm to reset and drives the trapezoidal block to reset. The friction pad 154 moves away from the outer wall of the inner filter plate 152 under its own elasticity. At this time, the first screw 131 reverses and can drive the inner filter plate 152 to rotate inside the outer filter plate 151 through the transmission structure.

[0045] Considering that the filter plate 15 is located inside and cannot be directly observed, in order to facilitate knowing the rotation angle of the inner filter plate 152, an indicator needle 1521 is provided on the top of the inner filter plate 152. The indicator needle 1521 passes through the outer filter plate 151 and the discharge head 14. An indicator plate 142 is provided on the top of the discharge head 14. The surface of the indicator plate 142 is provided with scale lines. With the indicator needle 1521 and the indicator plate 142, when the inner filter plate 152 rotates, the rotation angle of the inner filter plate 152 can be known according to the relative position of the indicator needle 1521 on the surface of the indicator plate 142 and through the set scale lines.

[0046] To ensure the adjustment effect of the pore area of ​​the filter plate 15, multiple fixing rods 155 are symmetrically arranged on the surface of the outer filter plate 151 near the discharge head 14. A fixing groove 143 is correspondingly opened in the discharge head 14, and the fixing rods 155 are located in the fixing groove 143. The fixing rods 155 and the fixing groove 143 are inserted and matched. The fixing groove 143 and the fixing rods 155 are inserted and matched to keep the outer filter plate 151 and the discharge head 14 fixed. This can prevent the inner filter plate 152 from rotating and causing the outer filter plate 151 to rotate, thereby ensuring the adjustment effect of the pore area of ​​the filter plate 15.

[0047] To facilitate the heating of plastic raw materials, the heating element 12 includes multiple induction coils 121 located in the inner tank 114. The induction coils 121 are provided with heat insulation sleeves 122 on their outer sides. By providing the heating element 12, the electromagnetic induction of the induction coils 121 causes eddy currents to be generated on the inner wall of the barrel 111, thereby raising the temperature of the inner wall of the barrel 111. Furthermore, the heat insulation sleeves 122 can prevent heat loss, so that the generated heat is concentrated inside the barrel 111, which is beneficial for heating the plastic raw materials.

[0048] Considering that the discharge head 14 needs to be disassembled periodically to remove accumulated impurities, side rods 141 are symmetrically provided on both sides of the discharge head 14 to facilitate assembly and disassembly. Slots 115 are symmetrically provided on the surface of the material cylinder 111 near the discharge head 14. The side rods 141 pass through the slots 115. A top plate 116 is provided on the top of the material cylinder 111. A bolt 117 is rotatably connected to the middle of the top plate 116. The bolt 117 is threadedly connected to the top of the material cylinder 111. The bottom two ends of the top plate 116 are located in the slots 115. The bottom two ends of the top plate 116 are engaged with the side rods 141. By providing the top plate 116, when the side rods 141 pass through the slots 115, the bolts 117 are rotated, causing the top plate 116 to move down. The bottom two ends of the top plate 116 enter the slots 115 and engage the side rods 141, thereby facilitating the assembly and disassembly of the discharge head 14.

[0049] Because the high temperature of the molten plastic makes it difficult to collect, a cooling groove is provided on the inner wall of the discharge head 14 to facilitate the cooling of the molten plastic. A heat-conducting ring 144 is provided in the cooling groove, and fins are provided on the surface of the heat-conducting ring 144. A ventilation port is provided on the outer surface of the discharge head 14, and the ventilation port is connected to the cooling groove. With the heat-conducting ring 144, when the molten plastic reaches the discharge head 14, its heat is absorbed by the heat-conducting ring 144. Air flows through the ventilation port and contacts the fins to carry away the heat, thereby facilitating the cooling of the molten plastic.

[0050] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An extruder for cable production with adjustable filter screen aperture area, comprising an extruder (11), characterized in that: The extruder (11) includes a barrel (111) and a platform (112) disposed at the bottom of the barrel (111). A hopper (113) is connected to the top of one end of the barrel (111). An inner groove (114) is formed in the inner wall of the barrel (111). A heating element (12) is disposed in the inner groove (114) for heating the barrel (111). An extruder (13) is rotatably connected inside the barrel (111). A motor is disposed at the top of the platform (112) near the hopper (113). The motor is connected to one end of the extruder (13) via a coupling. The material cylinder (111) has a discharge head (14) at the end away from the hopper (113). A filter plate (15) is provided between the discharge head (14) and the material cylinder (111). The filter plate (15) includes an outer filter plate (151) and an inner filter plate (152). An adjustment groove (153) is provided in the outer filter plate (151). The inner filter plate (152) is rotatably connected to the adjustment groove (153). A transmission structure is connected to the end of the inner filter plate (152) away from the discharge head (14). The other end of the transmission structure is connected to the end of the extruder (13) near the discharge head (14). The extruder (13) includes a first screw (131) with one end connected to the coupling, and the other end of the first screw (131) connected to the transmission structure. The first screw (131) is located inside the barrel (111) and has an end cone (132) on one end surface near the coupling. A second screw (133) is provided between the first screw (131) and the end cone (132). The transmission structure includes a connecting rod (158) and an end sleeve (159). One end of the connecting rod (158) is connected to the middle of the surface of the inner filter plate (152) away from the discharge head (14). The end sleeve (159) is connected to the end of the first screw (131) away from the second screw (133). The other end of the connecting rod (158) has symmetrically opened end grooves. The end grooves are provided with snap-fit ​​bodies (1581). The snap-fit ​​body (1581) includes a snap plate and a spring set at the bottom of the snap plate. The snap plate is connected to the inner surface of the end groove through the spring. The inner surface of the end sleeve (159) is provided with multiple triangular bodies. The snap plate is in contact with the surface of the triangular bodies. A friction pad (154) is provided near the edge of the adjustment groove (153), and the inner wall of the friction pad (154) is in contact with the outer wall of the inner filter plate (152). The friction pad (154) is an elastic washer. The outer filter plate (151) has a pressing groove (156) on the edge of its surface away from the discharge head (14). The pressing groove (156) is connected to the adjustment groove (153). The pressing groove (156) has a movable body (157) inside. The movable body (157) includes a diaphragm connected to the outer side of the inner surface of the pressing groove (156). The diaphragm has a trapezoidal block on the side near the friction pad (154).

2. The extruder for cable production with adjustable filter screen aperture area according to claim 1, characterized in that: The inner filter plate (152) is provided with an indicator needle (1521) at the top. The indicator needle (1521) passes through the outer filter plate (151) and the discharge head (14). The discharge head (14) is provided with an indicator plate (142) at the top. The surface of the indicator plate (142) is provided with scale lines.

3. The extruder for cable production with adjustable filter screen aperture area according to claim 1, characterized in that: The outer filter plate (151) has a plurality of fixing rods (155) symmetrically arranged on the side surface near the discharge head (14). The discharge head (14) has a corresponding fixing groove (143) in it. The fixing rods (155) are located in the fixing grooves (143) and are inserted into the fixing grooves (143).

4. The extruder for cable production with adjustable filter screen aperture area according to claim 1, characterized in that: The heating element (12) includes a plurality of induction coils (121) located in the inner groove (114), and the induction coils (121) are provided with heat insulation sleeves (122) on the outer side.

5. The extruder for cable production with adjustable filter screen aperture area according to claim 1, characterized in that: The discharge head (14) is symmetrically provided with side rods (141) on both sides. The material cylinder (111) is symmetrically provided with slots (115) on the surface of the side near the discharge head (14). The side rods (141) pass through the slots (115). The top of the material cylinder (111) is provided with a top plate (116). The top plate (116) is rotatably connected with a bolt (117) in the middle. The bolt (117) is threadedly connected to the top of the material cylinder (111). The bottom two ends of the top plate (116) are located in the slots (115). The bottom two ends of the top plate (116) are engaged with the side rods (141).

6. The extruder for cable production with adjustable filter screen aperture area according to claim 5, characterized in that: The inner wall of the discharge head (14) is provided with a cooling groove, and a heat-conducting ring (144) is provided in the cooling groove. The surface of the heat-conducting ring (144) is provided with fins. The outer surface of the discharge head (14) is provided with a ventilation opening, and the ventilation opening is connected to the cooling groove.

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