An extrusion method for the sheath of wire and cable

Abstract

The present invention discloses an extrusion method for the sheath of wire and cable, which relates to the technical field of plastic sheath processing of wire and cable. The extrusion method for the sheath of wire and cable is realized by an extrusion device for the sheath of wire and cable. The extrusion device for the sheath of wire and cable includes a melting material tank. A feeding hopper is fixedly nested at the top left of the melting material tank, and an injection nozzle is fixedly nested at the bottom right of the melting material tank. The melting material tank is detachably connected to an extrusion die through the injection nozzle. A driving mechanism is jointly arranged at the top, inside and bottom of the melting material tank. A stirring and pressing mechanism is arranged at the top outside the driving mechanism, and the stirring and pressing mechanism is located inside the melting material tank. The present invention can effectively output the melted plastic inside the melting material tank, avoid the waste of raw materials caused by residues and the situation that manual cleaning is required, and is more suitable for industrial production.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic sheath processing for wire and cable, and particularly relates to an extrusion method for wire and cable sheaths. Background Art

[0002] The outer part of the core of a conventional wire and cable has an insulating sheath for protection and insulation. According to different usage requirements, the sheath material can be divided into plastic or rubber. Plastic insulating sheaths are a conventional setting, and for cables that require high temperature resistance, rubber materials are usually used to make the sheath.

[0003] The invention patent with the authorization announcement number CN 106584802 B discloses an extrusion method for wire and cable sheaths and a positive displacement extruder, which solves the problem that the density, strength, and toughness of the current wire and cable sheaths are insufficient to meet the requirements of cables for electric vehicle charging piles. The method is as follows: enclose a closed space with three components having fixed geometric shapes; continuously rotate two components to continuously change the volume of the closed space. When the volume increases from small to large, molten sheath plastic is incorporated, and when the volume decreases from large to small, the molten sheath plastic is extruded, exhausted, plasticized, and transported to be extruded and wrapped around the outer periphery of the wire and cable to form a sheath.

[0004] When the above positive displacement extruder actually extrudes the insulating sheath, a melting cylinder with heating elements is used to melt plastic particles. Since the melted plastic raw material is sticky, inevitably, some raw materials will adhere to the inner wall of the melting cylinder. After the positive displacement extruder stops, the raw materials adhering to the inner wall of the melting cylinder gradually solidify. In this way, while wasting raw materials, additional labor is also required to remove the solidified raw materials on the inner wall of the melting cylinder.

[0005] In the prior art, since a conventional extruder usually uses a screw to transport the melted raw materials, the situation where the raw materials adhere to the inner wall of the melting cylinder after melting can be avoided. However, still some raw materials will adhere to the surface of the screw, which will also cause waste of raw materials and requires manual cleaning of the screw.

[0006] Therefore, it is very necessary to invent an extrusion method for wire and cable sheaths to solve the above problems. Summary of the Invention

[0007] The purpose of the present invention is to provide an extrusion method for wire and cable sheaths to solve the problems raised in the above background art.

[0008] To achieve the above-mentioned object, the present invention provides the following technical solutions: a method for extruding a sheath of a wire and cable, the method for extruding a sheath of a wire and cable is realized by an extrusion device for extruding a sheath of a wire and cable, the extrusion device for extruding a sheath of a wire and cable comprises a melting pot, a feeding hopper is fixedly nested on the top of the left side of the melting pot, and an injection nozzle is fixedly nested on the bottom of the right side of the melting pot, and the melting pot is detachably connected to an extrusion mold through the injection nozzle;

[0009] The top, inside and bottom of the melting tank are jointly provided with a driving mechanism, the top outside the driving mechanism is provided with a stirring and pressing mechanism, the stirring and pressing mechanism is located inside the melting tank, the bottom outside the driving mechanism is transmission-connected with a trigger mechanism, the trigger mechanism is located at the bottom of the melting tank, and locking mechanisms are provided on both sides of the trigger mechanism.

[0010] Preferably, the driving mechanism includes a driving motor, a driving screw, a first sliding groove, a locking rod, a telescopic rod and a first spring.

[0011] Preferably, the driving motor is fixedly arranged on the top of the melting pot, the driving screw is located inside the melting pot, and both ends extend out from the inside of the melting pot, both ends of the driving screw are rotatably connected to the melting pot through bearings, two first slide grooves are provided, and the two first slide grooves are respectively opened on the top of both sides of the driving screw, the locking rod is slidably arranged on the inner side of the first slide groove, the telescopic rod is slidably arranged inside the driving screw, the inner shaft of the telescopic rod is fixedly connected to the locking rod, the first spring is sleeved on the outer side of the inner shaft of the telescopic rod, one end of the first spring is in contact with the outer shaft of the telescopic rod, and the other end of the first spring is in contact with the locking rod.

[0012] Preferably, the stirring and pressing mechanism comprises a rotating plate, a sealing ring, a sliding stirring rod, an annular base, a locking hole and a locking groove.

[0013] Preferably, the rotating plate is sleeved on the outside of the driving screw and is threadedly connected to the driving screw. A sealing ring is rotatably connected to the outside of the rotating plate through a bearing. The sealing ring fits the inner wall of the melt tank. Two sliding stirring rods are provided. The two sliding stirring rods are respectively slid through the two sides of the top of the rotating plate. The annular base is fixedly provided at the bottom ends of the two sliding stirring rods and is rotatably nested in the bottom of the inner cavity of the melt tank through a bearing. A plurality of locking holes are provided. The plurality of locking holes are evenly opened at the bottom of the annular base. The locking groove is opened at the top of the rotating plate, and the locking rod is located on the inner side of the locking groove.

[0014] Preferably, the trigger mechanism includes a trigger plate, a guide rod, a second spring, a first rotating ring, a moving sleeve plate, a second rotating ring and a connecting rod.

[0015] Preferably, the trigger plate is sleeved outside the driving screw and is threadedly connected to the driving screw. There are two guiding rods, and the two guiding rods respectively penetrate through the two sides of the bottom of the trigger plate in a sliding manner and are fixedly connected to the melting tank. The second spring, the first rotating ring, the movable sleeve plate and the second rotating ring are all sleeved outside the driving screw in a sliding manner. One end of the second spring is fixedly connected to the trigger plate and the other end is fixedly connected to the first rotating ring. The first rotating ring and the second rotating ring are respectively rotationally nested on both sides of the movable sleeve plate through bearings. There are two connecting rods, and the two connecting rods are respectively sleeved on the front and back of the driving screw in a sliding manner. One end of the connecting rod is fixedly connected to the second rotating ring and the other end is fixedly connected to the outer shaft of the telescopic rod.

[0016] Preferably, the locking mechanism includes a locking column, a third spring and an end plate;

[0017] The locking column penetrates through the movable sleeve plate in a sliding manner. The bottom end of the locking column is sleeved on the bottom of the melting tank in a sliding manner. The third spring is sleeved outside the locking column. The end plate is fixedly arranged at the bottom end of the locking column. One end of the third spring is fixedly connected to the movable sleeve plate and the other end is fixedly connected to the end plate.

[0018] Preferably, the extrusion method of the wire and cable sheath specifically includes the following steps:

[0019] S1. Add a certain amount of plastic particles into the melting tank through the feeding hopper. The electric heating elements on the inner wall of the melting tank melt the plastic particles. Start the driving motor. After the driving motor starts, it drives the driving screw to rotate. When the driving screw rotates, it drives the locking rod to rotate synchronously through the first chute, and then the locking rod drives the rotating plate to rotate through the locking groove. The rotating plate drives the two sliding stirring rods to rotate around the driving screw as the axis, so as to stir the plastic particles and make the plastic particles evenly heated;

[0020] S2. During the rotation of the driving screw, it drives the trigger plate to continuously rise. When the trigger plate rises, it first drives the stretched second spring to reset. When the rising distance of the trigger plate reaches the first threshold, the second spring is completely reset. In the subsequent process, the trigger plate pushes the movable sleeve plate through the second spring, and the movable sleeve plate pushes the telescopic rod through the second rotating ring and the connecting rod. When the rising distance of the trigger plate reaches the second threshold, the locking rod is pushed out of the locking groove by the telescopic rod, thereby unlocking the rotating plate;

[0021] S3. When the rising distance of the trigger plate reaches the third threshold, the moving sleeve plate drives the locking column to insert into the locking hole at the bottom of the annular base through the third spring and the end plate, thereby locking the locking hole. At this time, the sliding stirring rod cannot rotate continuously, and at the same time, the plastic particles are completely melted. Since the sliding stirring rod cannot rotate anymore, under the limiting action of the sliding stirring rod, the rotating plate continues to move downward driven by the driving screw;

[0022] S4. When the rotating plate moves downward, it drives the sealing ring to move downward synchronously. The air between the rotating plate and the melted plastic liquid surface is discharged through the feed hopper during the downward movement of the rotating plate and the sealing ring. When the rotating plate and the sealing ring contact the melted plastic liquid surface, the melted plastic is continuously pushed and then injected into the extrusion die through the injection nozzle to complete the coating of the wire core;

[0023] S5. As the rotating plate and the sealing ring continue to descend, when the rotating plate and the sealing ring contact the inner cavity bottom of the melting tank, all the melted plastic is discharged, and the extrusion operation is completed. Then, the driving motor drives the driving screw to rotate reversely, so that the stirring and pressing mechanism, the triggering mechanism, and the locking mechanism are all reset.

[0024] The technical effects and advantages of the present invention:

[0025] By providing a driving mechanism, a stirring and pressing mechanism, a triggering mechanism, and a locking mechanism, the present invention facilitates driving the stirring and pressing mechanism by the driving mechanism, so that the stirring and pressing mechanism continuously stirs the heated plastic particles, making the plastic particles heat more evenly. Subsequently, the stirring and pressing mechanism drives the triggering mechanism, which triggers the driving mechanism and the locking mechanism in sequence. As a result, the driving mechanism releases the locking of the stirring and pressing mechanism, and at the same time, the locking mechanism locks the stirring and pressing mechanism, enabling the stirring and pressing mechanism driven by the driving mechanism to extrude all the melted plastic inside the melting tank. Compared with the same type of devices in the prior art, the present invention can effectively output the melted plastic inside the melting tank, avoiding raw material waste caused by residues and the need for manual cleaning, and is more suitable for industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a front view structural schematic diagram of the whole of the present invention.

[0027] Figure 2 It is a front sectional structural schematic diagram of the whole of the present invention.

[0028] Figure 3 It is a front sectional structural schematic diagram of the driving mechanism and the stirring and pressing mechanism of the present invention.

[0029] Figure 4This is a front cross-sectional structural schematic diagram of the stirring and feeding mechanism and the locking mechanism of the present invention.

[0030] Figure 5 This is a front cross-sectional structural schematic diagram of the triggering mechanism of the present invention.

[0031] In the figure: 1, melting material tank; 2, feeding hopper; 3, extrusion die; 4, driving mechanism; 41, driving motor; 42, driving screw; 43, first chute; 44, locking rod; 45, telescopic rod; 46, first spring; 5, stirring and feeding mechanism; 51, rotating plate; 52, sealing ring; 53, sliding stirring rod; 54, annular base; 55, locking hole; 56, locking groove; 6, triggering mechanism; 61, triggering plate; 62, guiding rod; 63, second spring; 64, first rotating ring; 65, moving sleeve plate; 66, second rotating ring; 67, connecting rod; 7, locking mechanism; 71, locking column; 72, third spring; 73, end plate. Specific embodiments

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0033] Embodiment 1

[0034] The present invention provides an extrusion method for a wire and cable sheath as shown in Figures 1-5 The extrusion method of the wire and cable sheath is realized by an extrusion device for the wire and cable sheath. The extrusion device for the wire and cable sheath includes a melting material tank 1. A feeding hopper 2 is fixedly nested at the top left of the melting material tank 1, and an injection nozzle is fixedly nested at the bottom right of the melting material tank 1. The melting material tank 1 is detachably connected to an extrusion die 3 through the injection nozzle;

[0035] A driving mechanism 4 is jointly arranged at the top, inside and bottom of the melting material tank 1. A stirring and feeding mechanism 5 is arranged at the top outside of the driving mechanism 4. The stirring and feeding mechanism 5 is located inside the melting material tank 1. The driving mechanism 4 is drivingly connected to a triggering mechanism 6 at the bottom outside. The triggering mechanism 6 is located at the bottom of the melting material tank 1. Locking mechanisms 7 are arranged on both sides of the triggering mechanism 6.

[0036] As shown in Figure 3As shown in the figure, the driving mechanism 4 includes a driving motor 41, a driving screw 42, a first chute 43, a locking rod 44, a telescopic rod 45 and a first spring 46. Among them, the driving motor 41 is fixedly arranged on the top of the melting tank 1. The driving screw 42 is located inside the melting tank 1 and extends out from both ends inside the melting tank 1. Both ends of the driving screw 42 are rotationally connected to the melting tank 1 through bearings. There are two first chutes 43, and the two first chutes 43 are respectively opened at the top on both sides of the driving screw 42. The locking rod 44 is slidably arranged inside the first chute 43. The telescopic rod 45 is slidably arranged inside the driving screw 42. The inner shaft of the telescopic rod 45 is fixedly connected to the locking rod 44. The first spring 46 is sleeved outside the inner shaft of the telescopic rod 45. One end of the first spring 46 contacts the outer shaft of the telescopic rod 45, and the other end of the first spring 46 contacts the locking rod 44.

[0037] By setting the above structure, it is convenient for the driving motor 41 to drive the locking rod 44 to rotate through the driving screw 42 and the first chute 43. When the telescopic rod 45 moves upward, the telescopic rod 45 pushes the locking rod 44 to move upward synchronously inside the first chute 43. When the locking rod 44 cannot continue to move upward, the telescopic rod 45 shortens and compresses the first spring 46.

[0038] As Figure 3 And Figure 4 As shown in the figure, the stirring and pressing mechanism 5 includes a rotating plate 51, a sealing ring 52, a sliding stirring rod 53, an annular base 54, a locking hole 55 and a locking groove 56. Among them, the rotating plate 51 is sleeved outside the driving screw 42 and is threadedly connected to the driving screw 42. The sealing ring 52 is rotationally connected to the outside of the rotating plate 51 through a bearing, and the sealing ring 52 is attached to the inner wall of the melting tank 1. There are two sliding stirring rods 53, and the two sliding stirring rods 53 are respectively slidably penetrated through the two sides of the top of the rotating plate 51. The annular base 54 is fixedly arranged at the bottom ends of the two sliding stirring rods 53 and is rotationally nested at the bottom of the inner cavity of the melting tank 1 through a bearing. There are multiple locking holes 55, and the multiple locking holes 55 are evenly opened at the bottom of the annular base 54. The locking groove 56 is opened at the top of the rotating plate 51. The locking rod 44 is located inside the locking groove 56.

[0039] By setting the above structure, it is convenient for the driving screw 42 to drive the rotating plate 51 to rotate through the locking rod 44. The rotating plate 51 drives the two sliding stirring rods 53 to stir the heated plastic particles with the driving screw 42 as the axis, so that the plastic particles are heated more evenly and the melting speed of the plastic particles is accelerated. Subsequently, when the annular base 54 is locked, the sliding stirring rods 53 cannot continue to rotate. Therefore, the rotating plate 51 can move downward under the drive of the driving screw 42, and then drive the sealing ring 52 to jointly push out the melted plastic particles.

[0040] As Figure 5 shown, the triggering mechanism 6 includes a trigger plate 61, a guide rod 62, a second spring 63, a first rotating ring 64, a movable sleeve plate 65, a second rotating ring 66 and a connecting rod 67. Among them, the trigger plate 61 is sleeved outside the driving screw 42 and is threadedly connected to the driving screw 42. There are two guide rods 62, and the two guide rods 62 respectively slide through the two sides of the bottom of the trigger plate 61 and are fixedly connected to the melting tank 1. The second spring 63, the first rotating ring 64, the movable sleeve plate 65 and the second rotating ring 66 are all slidably sleeved outside the driving screw 42. One end of the second spring 63 is fixedly connected to the trigger plate 61 and the other end is fixedly connected to the first rotating ring 64. The first rotating ring 64 and the second rotating ring 66 are respectively rotatably nested on both sides of the movable sleeve plate 65 through bearings. There are two connecting rods 67, and the two connecting rods 67 are respectively slidably nested on the front and back of the driving screw 42. One end of the connecting rod 67 is fixedly connected to the second rotating ring 66 and the other end is fixedly connected to the outer shaft of the telescopic rod 45.

[0041] By setting the above structure, it is convenient for the driving screw 42 to drive the trigger plate 61 to continuously rise during rotation. When the trigger plate 61 rises, it first drives the stretched second spring 63 to reset. When the rising distance of the trigger plate 61 reaches the first threshold, the second spring 63 is fully reset. In the subsequent process, the trigger plate 61 pushes the movable sleeve plate 65 through the second spring 63, and the movable sleeve plate 65 then pushes the telescopic rod 45 through the second rotating ring 66 and the connecting rod 67. When the rising distance of the trigger plate 61 reaches the second threshold, the locking rod 44 is pushed out of the locking groove 56 by the telescopic rod 45, thereby unlocking the rotating plate 51.

[0042] As Figure 4 shown, the locking mechanism 7 includes a locking column 71, a third spring 72 and an end plate 73. Among them, the locking column 71 slides through the movable sleeve plate 65, the bottom end of the locking column 71 is slidably nested at the bottom of the melting tank 1, the third spring 72 is sleeved outside the locking column 71, the end plate 73 is fixedly arranged at the bottom end of the locking column 71, and one end of the third spring 72 is fixedly connected to the movable sleeve plate 65 and the other end is fixedly connected to the end plate 73.

[0043] By setting the above structure, it is convenient for the movable sleeve plate 65 to drive the locking column 71 to move synchronously when moving, so that the locking column 71 is inserted into the inner side of the locking hole 55, thereby locking the annular base 54. Subsequently, as the movable sleeve plate 65 continues to move, since the locking column 71 cannot move anymore, the third spring 72 is stretched.

[0044] Embodiment 2

[0045] The extrusion method of the wire and cable sheath specifically includes the following steps:

[0046] S1. Add a certain amount of plastic particles into the inside of the melting tank 1 through the feeding hopper 2. The electric heating elements on the inner wall of the melting tank 1 melt the plastic particles. Start the driving motor 41. After the driving motor 41 starts, it drives the driving screw 42 to rotate. When the driving screw 42 rotates, it drives the locking rod 44 to rotate synchronously through the first chute 43. Then, the locking rod 44 drives the rotating plate 51 to rotate through the locking groove 56. The rotating plate 51 drives the two sliding stirring rods 53 to rotate around the driving screw 42 as the axis, thereby stirring the plastic particles and making the plastic particles evenly heated;

[0047] S2. During the rotation of the driving screw 42, it drives the trigger plate 61 to continuously rise. When the trigger plate 61 rises, it first drives the stretched second spring 63 to reset. When the rising distance of the trigger plate 61 reaches the first threshold value, the second spring 63 is completely reset. In the subsequent process, the trigger plate 61 pushes the moving sleeve plate 65 through the second spring 63. The moving sleeve plate 65 then pushes the telescopic rod 45 through the second rotating ring 66 and the connecting rod 67. When the rising distance of the trigger plate 61 reaches the second threshold value, the locking rod 44 is pushed out of the locking groove 56 by the telescopic rod 45, thereby releasing the locking of the rotating plate 51;

[0048] S3. When the rising distance of the trigger plate 61 reaches the third threshold value, the moving sleeve plate 65 drives the locking column 71 to insert into the locking hole 55 at the bottom of the annular base 54 through the third spring 72 and the end plate 73, thereby locking the locking hole 55. At this time, the sliding stirring rod 53 cannot continue to rotate, and at the same time, the plastic particles are completely melted. Since the sliding stirring rod 53 cannot rotate anymore, under the limiting action of the sliding stirring rod 53, the rotating plate 51 continues to move downward driven by the driving screw 42;

[0049] S4. When the rotating plate 51 moves downward, it drives the sealing ring 52 to move downward synchronously. The air between the rotating plate 51 and the melted plastic liquid surface is discharged through the feeding hopper 2 during the downward movement of the rotating plate 51 and the sealing ring 52. When the rotating plate 51 and the sealing ring 52 contact the melted plastic liquid surface, the melted plastic is continuously pushed and then injected into the inside of the extrusion die 3 through the injection nozzle to complete the coating of the wire core;

[0050] S5. As the rotating plate 51 and the sealing ring 52 continue to descend, when the rotating plate 51 and the sealing ring 52 contact the bottom of the inner cavity of the melting tank 1, all the melted plastic is discharged, and the extrusion operation is completed. Then, make the driving motor 41 drive the driving screw 42 to rotate in the reverse direction, thereby resetting all the stirring and pressing mechanism 5, the trigger mechanism 6, and the locking mechanism 7.

[0051] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An extrusion method for the sheath of wire and cable, characterized in that: The extrusion method for the sheath of wire and cable is realized by an extrusion device for the sheath of wire and cable. The extrusion device for the sheath of wire and cable includes a melt tank (1). A feed hopper (2) is fixedly nested at the top left of the melt tank (1), and an injection nozzle is fixedly nested at the bottom right of the melt tank (1). The melt tank (1) is detachably connected to an extrusion die (3) through the injection nozzle; A driving mechanism (4) is jointly arranged at the top, inside and bottom of the melt tank (1). A stirring and pressing mechanism (5) is arranged at the top outside of the driving mechanism (4). The stirring and pressing mechanism (5) is located inside the melt tank (1). The bottom outside of the driving mechanism (4) is drivingly connected to a triggering mechanism (6). The triggering mechanism (6) is located at the bottom of the melt tank (1). Locking mechanisms (7) are arranged on both sides of the triggering mechanism (6); The triggering mechanism (6) includes a trigger plate (61), a guide rod (62), a second spring (63), a first rotating ring (64), a movable sleeve plate (65), a second rotating ring (66) and a connecting rod (67); The trigger plate (61) is sleeved outside the driving screw (42) and is threadedly connected to the driving screw (42). Two guide rods (62) are provided. The two guide rods (62) respectively slide through the two sides of the bottom of the trigger plate (61) and are both fixedly connected to the melt tank (1). The second spring (63), the first rotating ring (64), the movable sleeve plate (65) and the second rotating ring (66) are all slidably sleeved outside the driving screw (42). One end of the second spring (63) is fixedly connected to the trigger plate (61) and the other end is fixedly connected to the first rotating ring (64). The first rotating ring (64) and the second rotating ring (66) are respectively rotationally nested on both sides of the movable sleeve plate (65) through bearings. Two connecting rods (67) are provided. The two connecting rods (67) are respectively slidably nested on the front and back of the driving screw (42). One end of the connecting rod (67) is fixedly connected to the second rotating ring (66) and the other end is fixedly connected to the outer shaft of the telescopic rod (45); The locking mechanism (7) includes a locking column (71), a third spring (72) and an end plate (73); The locking column (71) slidably penetrates through the movable sleeve plate (65). The bottom end of the locking column (71) is slidably nested at the bottom of the melt tank (1). The third spring (72) is sleeved outside the locking column (71). The end plate (73) is fixedly arranged at the bottom end of the locking column (71). One end of the third spring (72) is fixedly connected to the movable sleeve plate (65) and the other end is fixedly connected to the end plate (73).

2. An extrusion method for the sheath of wire and cable according to claim 1, characterized in that: The driving mechanism (4) includes a driving motor (41), a driving screw (42), a first chute (43), a locking rod (44), a telescopic rod (45) and a first spring (46).

3. The extrusion method of a wire and cable sheath according to claim 2, characterized in that: The driving motor (41) is fixedly arranged on the top of the melting tank (1), the driving screw rod (42) is located inside the melting tank (1), and both ends extend out from inside the melting tank (1). Both ends of the driving screw rod (42) are rotatably connected to the melting tank (1) through bearings. Two first chutes (43) are provided, and the two first chutes (43) are respectively opened on the top sides of both sides of the driving screw rod (42). The locking rod (44) is slidably arranged inside the first chute (43). The telescopic rod (45) is slidably arranged inside the driving screw rod (42). The inner shaft of the telescopic rod (45) is fixedly connected to the locking rod (44). The first spring (46) is sleeved outside the inner shaft of the telescopic rod (45). One end of the first spring (46) contacts the outer shaft of the telescopic rod (45), and the other end of the first spring (46) contacts the locking rod (44).

4. The extrusion method of a wire and cable sheath according to claim 3, characterized in that: The stirring and pressing mechanism (5) includes a rotating plate (51), a sealing ring (52), a sliding stirring rod (53), an annular base (54), a locking hole (55) and a locking groove (56).

5. The extrusion method of a wire and cable sheath according to claim 4, characterized in that: The rotating plate (51) is sleeved outside the driving screw rod (42) and is threadedly connected to the driving screw rod (42). The outer side of the rotating plate (51) is rotatably connected to a sealing ring (52) through a bearing. The sealing ring (52) fits against the inner wall of the melting tank (1). Two sliding stirring rods (53) are provided, and the two sliding stirring rods (53) respectively slide through the top sides of both sides of the rotating plate (51). The annular base (54) is fixedly arranged at the bottom ends of the two sliding stirring rods (53), and is rotatably nested inside the bottom cavity of the melting tank (1) through a bearing. A plurality of locking holes (55) are provided, and the plurality of locking holes (55) are evenly opened at the bottom of the annular base (54). The locking groove (56) is opened on the top of the rotating plate (51). The locking rod (44) is located inside the locking groove (56).

6. The extrusion method of a wire and cable sheath according to claim 5, characterized in that, The extrusion method of the wire and cable sheath specifically includes the following steps: S1. Add a certain amount of plastic particles into the melting tank (1) through the feed hopper (2). The electric heating elements on the inner wall of the melting tank (1) melt the plastic particles. Start the driving motor (41). After the driving motor (41) starts, it drives the driving screw rod (42) to rotate. When the driving screw rod (42) rotates, it drives the locking rod (44) to rotate synchronously through the first chute (43). Then, the locking rod (44) drives the rotating plate (51) to rotate through the locking groove (56). The rotating plate (51) drives the two sliding stirring rods (53) to rotate around the driving screw rod (42) as the axis, thereby stirring the plastic particles and making the plastic particles evenly heated; S2. During the rotation of the driving screw (42), the trigger plate (61) is continuously lifted. When the trigger plate (61) is lifted, it first drives the stretched second spring (63) to reset. When the lifting distance of the trigger plate (61) reaches the first threshold, the second spring (63) is fully reset. In the subsequent process, the trigger plate (61) pushes the moving sleeve plate (65) through the second spring (63). The moving sleeve plate (65) then pushes the telescopic rod (45) through the second rotating ring (66) and the connecting rod (67). When the lifting distance of the trigger plate (61) reaches the second threshold, the locking rod (44) is pushed out of the locking groove (56) by the telescopic rod (45), thereby releasing the locking of the rotating plate (51). S3. When the lifting distance of the trigger plate (61) reaches the third threshold, the moving sleeve plate (65) drives the locking column (71) to insert into the locking hole (55) at the bottom of the annular base (54) through the third spring (72) and the end plate (73), thereby locking the locking hole (55). At this time, the sliding stirring rod (53) cannot continue to rotate, and the plastic particles are completely melted. Since the sliding stirring rod (53) can no longer rotate, under the limiting action of the sliding stirring rod (53), the rotating plate (51) continues to move downward driven by the driving screw (42). S4. When the rotating plate (51) moves downward, it drives the sealing ring (52) to move downward synchronously. The air between the rotating plate (51) and the melted plastic liquid surface is discharged through the feed hopper (2) during the downward movement of the rotating plate (51) and the sealing ring (52). When the rotating plate (51) and the sealing ring (52) contact the melted plastic liquid surface, the melted plastic is continuously pushed and then injected into the extrusion die (3) through the injection nozzle, completing the coating of the wire core. S5. As the rotating plate (51) and the sealing ring (52) continue to descend, when the rotating plate (51) and the sealing ring (52) contact the inner cavity bottom of the melting tank (1), all the melted plastic is discharged, and the extrusion operation is completed. Then, the driving motor (41) drives the driving screw (42) to rotate in the reverse direction, thereby resetting the stirring and pressing mechanism (5), the trigger mechanism (6), and the locking mechanism (7).

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