Uniform mixing and extruding equipment for cable raw materials

Abstract

The invention relates to the technical field of extrusion and injection molding machines, and discloses cable raw material uniform mixing and extruding equipment which comprises a spiral conveyor and a mold, a mounting shell and a feeding mechanism are arranged outside the spiral conveyor, a traction mechanism is mounted on the mounting shell, and a feeding area, a preheating area and an injection area are arranged on the mounting shell; a preheating mechanism is mounted at the bottom of the mounting shell. By driving the rotating shell of the traction mechanism to rotate and cooperating with periodic positive and negative rotation switching of the impeller in the mixing assembly, multidirectional shearing force can be applied in the insulating layer raw material conveying process, and the defect that raw materials are non-uniformly dispersed due to a static mixer and a one-way stirring structure is thoroughly overcome; the uniform raw materials can remarkably reduce the phase separation phenomenon in the plasticizing process, component segregation or local performance weakening of the insulating layer is avoided, and the dielectric strength consistency of the extruded insulating layer is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of extrusion injection molding machines, in particular to a cable raw material uniform mixing extrusion equipment. BACKGROUND

[0002] In the production and processing process of the cable, the insulating material needs to be wrapped around the metal conductor of the cable, and the insulating layer is an important part of the cable. Its main function is to isolate the conductor from the outer shielding layer, prevent signal interference and leakage, and at the same time prevent the cable from being mechanically damaged by the external environment.

[0003] When processing the cable insulating layer, the raw material needs to be injected into the screw conveyor, and before that, the raw material needs to be mixed and stirred. However, at present, static mixers or one-way stirring structures are generally used. The raw material lacks multi-directional shearing force during transportation, resulting in uneven dispersion of the raw material, affecting the consistency of the physical properties of the cable insulating layer. In addition, the screw conveyor generally directly heats the raw material during transportation, lacks a preheating process, and the heat is conducted from the outside to the inside, resulting in a large temperature difference between the inside and outside of the raw material. The outer layer of the raw material is prone to high-temperature degradation, the center of the raw material is not fully softened, and there are residual moisture and volatile substances, which form pores after extrusion. SUMMARY

[0004] In order to overcome the above-mentioned defects of the prior art, the present application provides a cable raw material uniform mixing extrusion equipment to solve the problems existing in the background art.

[0005] The present application provides the following technical scheme: a cable raw material uniform mixing extrusion equipment, comprising a screw conveyor and a mold, the screw conveyor is provided with a mounting shell and a feeding mechanism outside, the mounting shell is provided with a traction mechanism, the mounting shell is provided with a feeding area, a preheating area and an injection area, the mounting shell is provided with a preheating mechanism at the bottom, the feeding mechanism is used for conveying the cable insulating layer raw material to the feeding area, the traction mechanism is used for moving the cable insulating layer raw material between the feeding area, the preheating area and the injection area, and mixing and stirring the cable insulating layer raw material, and the preheating mechanism is used for preheating the cable insulating layer raw material during the process of passing through the preheating area.

[0006] Preferably, the traction mechanism comprises a rotating shell, the rotating shell is rotatably installed on the mounting shell, the rotating shell is provided with a conveying cavity, the conveying cavity is uniformly provided with six, the conveying cavity is provided with a mixing assembly, and the rotating shell is fixedly connected with a rotating rod at the center.

[0007] Preferably, the injection area is fixedly connected with an injection nozzle at the bottom, the injection nozzle is fixedly connected with the feeding nozzle of the screw conveyor at the bottom, the mounting shell is fixedly connected with a gear ring at the top, the screw conveyor is fixedly installed with a motor outside, the rotating rod penetrates through the mounting shell at the bottom end, and the rotating rod is fixedly connected with the output end of the motor at the bottom end.

[0008] Preferably, the mixing assembly comprises a support plate, a transmission rod, a mounting shaft and a bearing frame, the support plate is fixedly installed on the top of the conveying cavity, the support plate top is fixedly connected with a feeding nozzle, three impellers are arranged in each conveying cavity, the impeller center is fixedly connected with a rotating shaft, the rotating shaft is rotatably installed on the support plate, the rotating shaft top extends upward through the support plate top, a power transmission piece two is arranged between the three rotating shafts, and one of the rotating shaft top is fixedly connected with a spur gear.

[0009] Preferably, the transmission rod is rotatably installed on the outer circular surface of the rotating shell, the mounting shaft is rotatably installed on the support plate top, the transmission rod bottom is fixedly connected with a bevel gear, the bevel gear is meshingly connected with a tooth ring, a power transmission piece one is arranged between the transmission rod top and the mounting shaft, and a main connecting rod and a vice connecting rod are arranged between the mounting shaft and the bearing frame.

[0010] Preferably, one end of the main connecting rod is fixedly connected with the mounting shaft top, the other end of the main connecting rod is hingedly connected with one end of the vice connecting rod, the other end of the vice connecting rod is hingedly connected with the bearing frame, a rack is fixedly connected on the bearing frame, and the rack is meshingly connected with the spur gear.

[0011] Preferably, a guide frame is arranged on the bearing frame bottom, the guide frame is fixedly installed on the support plate top, a T-shaped guide plate is fixedly connected on the bearing frame bottom, and the guide plate is slidably installed on the guide frame.

[0012] Preferably, the preheating mechanism comprises a positioning shell, the positioning shell is fixedly installed on the bottom of the preheating area, a fan and an electric heating wire are installed in the positioning shell, a through hole plate is also fixedly installed in the preheating area, and a temperature sensor and a PLC control system are integrated on the through hole plate.

[0013] Preferably, the feeding mechanism comprises a base, a storage cylinder one and a storage cylinder two, the storage cylinder one and the storage cylinder two are both fixedly installed on the base top, the storage cylinder one is used for storing plastic raw materials, the storage cylinder two is used for storing additives, and a flow guide assembly is arranged at the output end of the storage cylinder one and the storage cylinder two.

[0014] Preferably, the flow guide assembly comprises an electromagnetic valve, a spray head and an electric sliding rail, the electromagnetic valve and the spray head are fixedly connected through a hose, the electric sliding rail is fixedly installed on the base, a sliding plate is slidably installed on the electric sliding rail, and the spray head is fixedly installed on the sliding plate.

[0015] The beneficial effects of the present application are as follows: 1. The application can apply multi-directional shearing force in the insulation layer raw material conveying process by rotating the rotating shell of the driving traction mechanism, cooperating with the periodic forward and reverse switching of the impeller in the mixing assembly, completely solving the defects of uneven dispersion of raw materials caused by static mixers and one-way stirring structure. In addition, the rotating motion of the traction mechanism is coordinated with the forward and reverse rotation of the impeller, so that the raw materials realize three-dimensional turbulent mixing in the conveying cavity, which significantly improves the uniformity and physical property consistency of the raw materials. In the subsequent injection stage, uniform raw materials can significantly reduce the phase separation phenomenon in the plasticizing process, avoid composition segregation or local performance weakening of the insulation layer, and ensure the dielectric strength consistency of the extruded insulation layer.

[0016] 2. The hot air of the preheating mechanism can be uniformly diffused through the through-hole plate to form a penetrating heating, and the raw materials are preheated synchronously in a moving state, which not only eliminates the risk of local overheating degradation caused by internal and external temperature difference, but also makes the moisture and volatile substances fully evaporate in the preheating area. This design eliminates the entry of wet raw materials into the screw conveyor from the source, avoiding the formation of micro-pores by water vaporization in the high-temperature injection stage, and significantly improving the compactness of the insulation layer.

[0017] 3. The feeding mechanism of the application adopts an electric sliding rail to control the dynamic tracking of the nozzle by the spray head, and combines the opening and closing control of the electromagnetic valve to realize the time-sequential and accurate feeding of plastic raw materials and additives. In addition, the preheating area is designed as an independent partition, which can monitor the raw material temperature of the preheating area in real time through the integrated temperature sensor and PLC control system, so as to automatically adjust the power of the heating wire and the fan speed according to actual needs. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creating laborious work.

[0019] Figure 1 It is a schematic diagram of the overall structure of the application.

[0020] Figure 2 It is a cooperation diagram of the screw conveyor and the mounting shell of the application.

[0021] Figure 3 It is a structural schematic diagram of the mounting shell, the feeding mechanism and the traction mechanism of the application.

[0022] Figure 4 It is a structural schematic diagram of the mounting shell, the traction mechanism and the preheating mechanism of the application.

[0023] Figure 5 It is an exploded view of the mounting shell and the traction mechanism of the application.

[0024] Figure 6 is the preheating mechanism of the application.

[0025] Figure 7 is the traction mechanism structure of the application.

[0026] Figure 8 is the mixing assembly structure of the application.

[0027] Figure 9 is the structure of A in the application Figure 3 .

[0028] Figure 10 is the structure of B in the application Figure 8 .

[0029] Figure 11 is the mixing assembly partial structure of the application.

[0030] Figure 12 is the feeding mechanism structure of the application.

[0031] Figure 13 is the structure of C in the application Figure 12 .

[0032] The figure marks are: 1, screw conveyor; 2, mold; 3, installation shell; 31, injection nozzle; 32, gear ring; 3A, feeding area; 3B, preheating area; 3C, injection area; 4, feeding mechanism; 41, storage cylinder one; 42, storage cylinder two; 43, flow guide assembly; 431, electromagnetic valve; 432, spray head; 433, hose; 434, electric sliding rail; 435, sliding plate; 5, traction mechanism; 51, rotating shell; 52, conveying cavity; 53, mixing assembly; 531, support plate; 5311, feeding nozzle; 532, impeller; 5321, rotating shaft; 5322, flat gear; 533, transmission rod; 5331, bevel gear; 534, installation shaft; 535, power transmission one; 536, main connecting rod; 537, auxiliary connecting rod; 538, bearing frame; 5381, guide plate; 5382, rack; 5383, guide frame; 539, power transmission two; 54, rotating rod; 6, preheating mechanism; 61, positioning shell; 62, through-hole plate; 63, fan; 64, electric heating wire. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned purposes, features and advantages of the application more obvious and easy to understand, the specific embodiments of the application are described in detail below with reference to the drawings of the specification.

[0034] Refer to Figures 1-5The application provides a cable raw material uniform mixing and extruding device, which comprises a spiral conveyor 1 and a mold 2, the spiral conveyor 1 is externally provided with a mounting shell 3 and a feeding mechanism 4, the mounting shell 3 is provided with a traction mechanism 5, the mounting shell 3 is provided with a feeding area 3A, a preheating area 3B and an injection area 3C, the bottom of the mounting shell 3 is provided with a preheating mechanism 6, the feeding mechanism 4 is used for conveying cable insulation layer raw materials to the feeding area 3A, the traction mechanism 5 is used for moving the cable insulation layer raw materials between the feeding area 3A, the preheating area 3B and the injection area 3C, and mixing and stirring the cable insulation layer raw materials, and the preheating mechanism 6 is used for preheating the cable insulation layer raw materials when the cable insulation layer raw materials pass through the preheating area 3B, so that the functions of cable insulation layer raw material conveying, preheating, mixing and injection are integrated through the partitioned design, and the process efficiency of the device is improved.

[0035] With reference to Figures 1-11 The traction mechanism 5 comprises a rotating shell 51, the rotating shell 51 is rotatably installed on the mounting shell 3, the rotating shell 51 is internally provided with six conveying cavities 52, the conveying cavities 52 are internally provided with mixing assemblies 53, the rotating shell 51 is fixedly connected with a rotating rod 54 at the center, and the multiple conveying cavities 52 are arranged in cooperation with the rotating power input, so that the parallel processing and continuous conveying of the raw materials can be realized.

[0036] Further, the bottom of the injection area 3C is fixedly connected with an injection nozzle 31, the bottom of the injection nozzle 31 is fixedly connected with a feeding nozzle of the spiral conveyor 1, the top of the mounting shell 3 is fixedly connected with a tooth ring 32, the spiral conveyor 1 is externally fixedly installed with a motor, the bottom end of the rotating rod 54 penetrates through the mounting shell 3, and the bottom end of the rotating rod 54 is fixedly connected with the output end of the motor, so that the overall structure is simplified through the integrated power transmission design, and the synchronous and efficient driving of the rotating rod 54 and the spiral conveyor 1 is ensured.

[0037] Further, the mixing assembly 53 comprises a support plate 531, a transmission rod 533, a mounting shaft 534 and a bearing frame 538, the support plate 531 is fixedly installed at the top of the conveying cavity 52, a feeding nozzle 5311 is fixedly connected to the top of the support plate 531, three impellers 532 are arranged in each conveying cavity 52, a rotating shaft 5321 is fixedly connected to the center of the impeller 532, the rotating shaft 5321 is rotatably installed on the support plate 531, the rotating shaft 5321 extends upwards through the top of the support plate 531, a power transmission piece two 539 is arranged between the three rotating shafts 5321, a spur gear 5322 is fixedly connected to the top end of one of the rotating shafts 5321, the transmission rod 533 is rotatably installed on the outer circular face of the rotating shell 51, the mounting shaft 534 is rotatably installed on the top of the support plate 531, a bevel gear 5331 is fixedly connected to the bottom end of the transmission rod 533, the bevel gear 5331 is meshedly connected with the tooth ring 32, a power transmission piece one 535 is arranged between the top end of the transmission rod 533 and the mounting shaft 534, a main connecting rod 536 and an auxiliary connecting rod 537 are arranged between the mounting shaft 534 and the bearing frame 538, one end of the main connecting rod 536 is fixedly connected with the top end of the mounting shaft 534, the other end of the main connecting rod 536 is hingedly connected with one end of the auxiliary connecting rod 537, the other end of the auxiliary connecting rod 537 is hingedly connected with the bearing frame 538, a rack 5382 is fixedly connected to the bearing frame 538, the rack 5382 is meshedly connected with the spur gear 5322, a guide frame 5383 is arranged at the bottom of the bearing frame 538, the guide frame 5383 is fixedly installed on the top of the support plate 531, a guide plate 5381 in a T-shaped structure is fixedly connected to the bottom of the bearing frame 538, the guide plate 5381 is slidably installed on the guide frame 5383, through the cooperation of the gear transmission and the connecting rod transmission, the revolution of the rotating shell 51 is converted into the periodic forward and reverse rotation of the impeller 532, three-dimensional turbulent shear force is formed in the conveying cavity 52, the problem of uneven dispersion of raw materials is completely solved, in addition, the design of the guide frame 5383 ensures the accurate movement track of the rack 5382, and the mixing stability is improved.

[0038] In use, the motor drives the rotating rod 54 to rotate around its own axis, the rotating rod 54 rotates and drives the traction mechanism 5 to synchronously rotate around the axis of the rotating rod 54, since the bevel gear 5331 is always in mesh with the tooth ring 32, in this process, the transmission rod 533 synchronously rotates around its own axis, the transmission rod 533 rotates and drives the mounting shaft 534 to synchronously rotate around its own axis through the power transmission part one 535, the mounting shaft 534 rotates and drives the main connecting rod 536 to synchronously rotate around the axis of the mounting shaft 534, the main connecting rod 536 rotates and drives the guide plate 5381 at the bottom of the bearing frame 538 to reciprocate along the guide frame 5383 through the auxiliary connecting rod 537, the rack 5382 also reciprocates synchronously with the bearing frame 538, the rack 5382 moves and drives the rotating shaft 5321 to synchronously rotate around its own axis through the spur gear 5322 and the power transmission part two 539, the rotating shaft 5321 rotates and drives the impeller 532 to synchronously rotate around the axis of the rotating shaft 5321, and the impeller 532 switches between forward rotation and reverse rotation.

[0039] In summary, by rotating the rotating shell 51 of the traction mechanism 5 and cooperating with the periodic forward and reverse rotation switching of the impeller 532 in the mixing assembly 53, multi-directional shear force can be applied to the insulation layer raw material during the conveying process, the defects of uneven dispersion of raw materials caused by static mixers and unidirectional stirring structure are completely solved, in addition, the rotating movement of the traction mechanism 5 is coordinated with the forward and reverse rotation of the impeller 532, so that the raw materials realize three-dimensional turbulent mixing in the conveying cavity 52, the uniformity and physical property consistency of the raw materials are significantly improved, in the subsequent injection stage, the uniform raw materials can significantly reduce the phase separation phenomenon in the plasticizing process, avoid composition segregation or local performance weakening of the insulation layer, and ensure the dielectric strength consistency of the extruded insulation layer.

[0040] With reference to Figures 1-13 The preheating mechanism 6 comprises a positioning shell 61 fixedly installed at the bottom of the preheating area 3B, a fan 63 and an electric heating wire 64 are installed in the positioning shell 61, a through-hole plate 62 is also fixedly installed in the preheating area 3B, the through-hole plate 62 is integrated with a temperature sensor and a PLC control system, the through-hole plate 62 uniformly diffuses hot air to realize penetrating heating, cooperates with the temperature control system to eliminate the temperature difference between the inside and outside of the raw materials, and avoids local degradation and fully evaporates moisture.

[0041] The feeding mechanism 4 comprises a base, a storage cylinder one 41 and a storage cylinder two 42, the storage cylinder one 41 and the storage cylinder two 42 are both fixedly installed at the top of the base, the storage cylinder one 41 is used for storing plastic raw materials, and the storage cylinder two 42 is used for storing additives, the output ends of the storage cylinder one 41 and the storage cylinder two 42 are both provided with a flow guide assembly 43, the double-storage-cylinder separated design ensures that the raw materials and the additives are independently supplied, and prevents the pre-mixing from affecting the feeding accuracy.

[0042] Further, the flow guide assembly 43 comprises an electromagnetic valve 431, a spray head 432 and an electric slide rail 434, the electromagnetic valve 431 and the spray head 432 are fixedly connected through a hose 433, the electric slide rail 434 is fixedly installed on the base, a sliding plate 435 is slidably installed on the electric slide rail 434, the spray head 432 is fixedly installed on the sliding plate 435, the electric slide rail 434 dynamically tracks the feeding nozzle 5311, and combined with the timing control of the electromagnetic valve 431, precise feeding of multiple stations is realized, and raw material spilling or cross contamination is prevented.

[0043] In use, in the process of rotating the rotating shell 51 around the axis of the rotating rod 54, when the feeding nozzle 5311 is rotated to the bottom of the spray head 432 on the first material storage cylinder 41, the electric slide rail 434 controls the sliding plate 435 to slide synchronously along the track with the rotation of the feeding nozzle 5311, so that the spray head 432 is always located at the top of the feeding nozzle 5311, at the same time, the electromagnetic valve 431 is opened, the plastic raw material in the first material storage cylinder 41 passes through the hose 433 and enters the conveying cavity 52 through the feeding nozzle 5311 (after the sliding plate 435 slides to the end of the track, the electric slide rail 434 controls the sliding plate 435 to return to the initial position, and the electromagnetic valve 431 is closed, when the next feeding nozzle 5311 is rotated to the bottom of the spray head 432 on the first material storage cylinder 41, the above steps are repeated, and the cycle is repeated); Then, the feeding nozzle 5311 is rotated to the bottom of the spray head 432 on the second material storage cylinder 42, and for the same reason, the spray head 432 is always located at the top of the feeding nozzle 5311 with the rotation of the feeding nozzle 5311, at the same time, the electromagnetic valve 431 is opened, the additive in the second material storage cylinder 42 passes through the hose 433 and enters the conveying cavity 52 through the feeding nozzle 5311 (after the sliding plate 435 slides to the end of the track, the electric slide rail 434 controls the sliding plate 435 to return to the initial position, and the electromagnetic valve 431 is closed, when the next feeding nozzle 5311 is rotated to the bottom of the spray head 432 on the second material storage cylinder 42, the above steps are repeated, and the cycle is repeated); With the rotation of the rotating shell 51, the plastic raw material and the additive in the conveying cavity 52 pass through the feeding area 3A and enter the preheating area 3B, in the process, the hot air blown by the fan 63 carries heat after passing through the electric heating wire 64, the hot air passes through the through-hole plate 62 and enters the conveying cavity 52 to preheat the plastic raw material and the additive, in addition, with the continuous forward and reverse rotation of the impeller 532, the plastic raw material and the additive are uniformly mixed and further preheated, after leaving the preheating area 3B, the mixture of the plastic raw material and the additive enters the injection area 3C and is discharged into the screw conveyor 1 through the injection nozzle 31, in the process of conveying the cable insulation layer raw material (i.e. the mixture of the plastic raw material and the additive) by the screw conveyor 1, the cable insulation layer raw material is heated to a molten state, the raw material in the molten state passes through the mold 2 and is extruded outward, at the same time, the metal conductor passes through the mold 2, the raw material wraps the surface of the metal conductor to form a continuous insulation layer (this is the existing technology in the field of cable insulation layer processing, which will not be described here).

[0044] In summary, the hot air of the preheating mechanism 6 is uniformly diffused through the through-hole plate 62, realizing penetrating heating, synchronously preheating the raw materials in a moving state, ensuring the uniformity of the raw materials heated, and also evaporating the moisture in the raw materials in the preheating area 3B in advance, thereby preventing the moisture-containing raw materials from entering the spiral conveyor 1 from the source and avoiding the formation of micro-pores due to the evaporation of moisture in the high-temperature injection stage, and significantly improving the compactness of the insulation layer. In addition, the feeding mechanism 4 uses the electric sliding rail 434 to control the dynamic tracking of the nozzle 432 to the feeding nozzle 5311, and combines the opening and closing control of the electromagnetic valve 431 to realize the time-sequential and accurate feeding of the plastic raw materials and additives. In addition, the preheating area 3B is designed in an independent partitioning manner, and through the integrated temperature sensor and PLC control system, the raw material temperature in the preheating area 3B can be monitored in real time, so that the power of the heating wire 64 and the air speed of the fan 63 can be automatically adjusted according to the actual needs. The specific control system and logic programming of this part are existing technologies in the intelligent field, and will not be described here.

[0045] The working principle of the application is as follows: the motor drives the rotating rod 54 to rotate around its axis, the rotating rod 54 rotates and drives the traction mechanism 5 to rotate synchronously around the axis of the rotating rod 54. Since the bevel gear 5331 is always in meshing with the tooth ring 32, the transmission rod 533 rotates synchronously around its axis during this process. The transmission rod 533 rotates and drives the mounting shaft 534 to rotate synchronously around its axis through the power transmission part one 535. The mounting shaft 534 rotates and drives the main connecting rod 536 to rotate synchronously around the axis of the mounting shaft 534. The main connecting rod 536 rotates and drives the guide plate 5381 at the bottom of the supporting frame 538 to slide reciprocally along the guide frame 5383 through the auxiliary connecting rod 537. The rack 5382 also reciprocates synchronously with the supporting frame 538. The rack 5382 moves simultaneously to drive the rotating shaft 5321 to rotate synchronously around its axis through the spur gear 5322 and the power transmission part two 539. The rotating shaft 5321 rotates and drives the impeller 532 to rotate synchronously around the axis of the rotating shaft 5321. The impeller 532 switches between forward rotation and reverse rotation.

[0046] During the rotation of the rotating shell 51 around the axis of the rotating rod 54, when the feeding nozzle 5311 rotates to the bottom of the nozzle 432 on the material storage cylinder one 41, the electric sliding rail 434 controls the sliding plate 435 to slide synchronously along the track as the feeding nozzle 5311 rotates, so that the nozzle 432 is always located at the top of the feeding nozzle 5311. At the same time, the electromagnetic valve 431 is opened, and the plastic raw materials in the material storage cylinder one 41 pass through the hose 433 and enter the conveying cavity 52 through the feeding nozzle 5311 (after the sliding plate 435 slides to the end of the track, the electric sliding rail 434 controls the sliding plate 435 to return to the initial position, and the electromagnetic valve 431 is closed. When the next feeding nozzle 5311 rotates to the bottom of the nozzle 432 on the material storage cylinder one 41, the above steps are repeated, and the cycle is repeated).

[0047] Afterwards, the feed nozzle 5311 rotates to the bottom of the nozzle 432 on the storage barrel 2 42. Similarly, with the rotation of the feed nozzle 5311, the nozzle 432 is always located at the top of the feed nozzle 5311. At the same time, the solenoid valve 431 opens, and the additive in the storage barrel 2 42 passes through the hose 433 and enters the conveying chamber 52 through the feed nozzle 5311 (when the slide 435 slides to the end along the track, the electric slide rail 434 controls the slide 435 to return to the initial position, and the solenoid valve 431 is closed. When the next feed nozzle 5311 rotates to the bottom of the nozzle 432 on the storage barrel 2 42, the above steps are repeated, and the cycle is repeated). With the rotation of the rotating shell 51, the plastic raw materials and additives in the conveying chamber 52 pass through the feeding area 3A and enter the preheating area 3B. In this process, The wind blown out by the fan 63 carries heat after passing through the electric heating wire 64. The hot wind passes through the through-hole plate 62 and enters the conveying cavity 52 to preheat the plastic raw material and additives. In addition, with the continuous forward and reverse rotation of the impeller 532, the plastic raw material and the additive are evenly mixed and further fully preheated. After leaving the preheating zone 3B, the mixture of the plastic raw material and the additive enters the injection zone 3C and is discharged into the screw conveyor 1 by the injection nozzle 31. During the process of the screw conveyor 1 conveying the cable insulation layer raw material (that is, the mixture of the plastic raw material and the additive), the cable insulation layer raw material is heated to a molten state. The molten raw material passes through the mold 2 and is extruded outward. At the same time, the metal conductor passes through the mold 2, and the raw material wraps the surface of the metal conductor to form a continuous insulation layer.

[0048] It should be noted that the above embodiments are only used to illustrate the technical solutions 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 preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A cable raw material uniform mixing and extrusion device, comprising a screw conveyor (1) and a die (2), characterized in that: The screw conveyor (1) is provided with a mounting shell (3) and a feeding mechanism (4) on the outside, a traction mechanism (5) is installed on the mounting shell (3), a feeding area (3A), a preheating area (3B) and an injection area (3C) are provided on the mounting shell (3), and a preheating mechanism (6) is installed at the bottom of the mounting shell (3), the feeding mechanism (4) is used to convey the cable insulation layer raw material to the feeding area (3A), the traction mechanism (5) is used to traction the cable insulation layer raw material to move between the feeding area (3A), the preheating area (3B) and the injection area (3C), and to mix and stir the cable insulation layer raw material, and the preheating mechanism (6) is used to preheat the cable insulation layer raw material during the process of the cable insulation layer raw material passing through the preheating area (3)B.

2. A cable raw material uniform mixing and extrusion device according to claim 1, characterized in that: The traction mechanism (5) includes a rotating shell (51) which is rotatably mounted on the mounting shell (3). A conveying cavity (52) is provided in the rotating shell (51). Six conveying cavities (52) are evenly arranged. A mixing assembly (53) is provided in the conveying cavity (52). A rotating rod (54) is fixedly connected to the center of the rotating shell (51).

3. The cable raw material uniform mixing and extrusion equipment according to claim 2, characterized in that: The bottom of the injection area (3C) is fixedly connected to an injection nozzle (31), the bottom of the injection nozzle (31) is fixedly connected to the feeding nozzle of the screw conveyor (1), the top of the mounting shell (3) is fixedly connected to a gear ring (32), the outside of the screw conveyor (1) is fixedly installed with a motor, the bottom end of the rotating rod (54) passes through the mounting shell (3), and the bottom end of the rotating rod (54) is fixedly connected to the output end of the motor.

4. A cable raw material uniform mixing and extrusion device according to claim 3, characterized in that: The mixing assembly (53) includes a support plate (531), a transmission rod (533), a mounting shaft (534) and a receiving frame (538). The support plate (531) is fixedly mounted on the top of the conveying chamber (52). The top of the support plate (531) is fixedly connected to a feed nozzle (5311). Three impellers (532) are provided in each conveying chamber (52). A rotating shaft (5321) is fixedly connected at the center of the impeller (532). The rotating shaft (5321) is rotatably mounted on the support plate (531). The top of the rotating shaft (5321) passes through the top of the support plate (531) and extends upward. A power transmission member 2 (539) is provided between the three rotating shafts (5321), and a flat gear (5322) is fixedly connected to the top of one of the rotating shafts (5321).

5. The cable raw material uniform mixing and extrusion equipment according to claim 4, characterized in that: The transmission rod (533) is rotatably mounted on the outer cylindrical surface of the rotating shell (51), and the mounting shaft (534) is rotatably mounted on the top of the support plate (531). The bottom end of the transmission rod (533) is fixedly connected with a bevel gear (5331), and the bevel gear (5331) is meshedly connected with the gear ring (32). A power transmission member (535) is provided between the top end of the transmission rod (533) and the mounting shaft (534), and a main connecting rod (536) and a secondary connecting rod (537) are provided between the mounting shaft (534) and the receiving frame (538).

6. The cable raw material uniform mixing and extrusion equipment according to claim 5, characterized in that: One end of the main connecting rod (536) is fixedly connected to the top of the mounting shaft (534), the other end of the main connecting rod (536) is hinged to one end of the auxiliary connecting rod (537), and the other end of the auxiliary connecting rod (537) is hinged to the receiving frame (538). A rack (5382) is fixedly connected to the receiving frame (538), and the rack (5382) is meshed with the flat gear (5322).

7. The cable raw material uniform mixing and extrusion equipment according to claim 6, characterized in that: A guide frame (5383) is provided at the bottom of the receiving frame (538), and the guide frame (5383) is fixedly installed on the top of the support plate (531). A guide plate (5381) with a T-shaped structure is fixedly connected to the bottom of the receiving frame (538), and the guide plate (5381) is slidably installed on the guide frame (5383).

8. The cable raw material uniform mixing and extrusion equipment according to claim 7, characterized in that: The preheating mechanism (6) includes a positioning shell (61), which is fixedly installed at the bottom of the preheating zone (3B). A fan (63) and a heating wire (64) are installed in the positioning shell (61). A through-hole plate (62) is also fixedly installed in the preheating zone (3B), and a temperature sensor and a PLC control system are integrated on the through-hole plate (62).

9. The cable raw material uniform mixing and extrusion equipment according to claim 8, characterized in that: The feeding mechanism (4) includes a base, a storage barrel 1 (41) and a storage barrel 2 (42). The storage barrel 1 (41) and the storage barrel 2 (42) are both fixedly mounted on the top of the base. The storage barrel 1 (41) is used to store plastic raw materials, and the storage barrel 2 (42) is used to store additives. The output ends of the storage barrel 1 (41) and the storage barrel 2 (42) are both provided with a guide assembly (43).

10. The cable raw material uniform mixing and extrusion equipment according to claim 9, characterized in that: The flow guide assembly (43) includes a solenoid valve (431), a nozzle (432) and an electric slide rail (434). The solenoid valve (431) and the nozzle (432) are fixedly connected via a hose (433). The electric slide rail (434) is fixedly mounted on the base. A slide plate (435) is slidably mounted on the electric slide rail (434). The nozzle (432) is fixedly mounted on the slide plate (435).

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