Temperature compensation device of PVC (polyvinyl chloride) sheath screw extrusion mechanism

Abstract

The utility model relates to a temperature compensation device of a PVC (polyvinyl chloride) sheath screw extrusion mechanism, which comprises an extrusion part and a temperature compensation part connected onto the extrusion part, the temperature compensation part comprises heating components connected at the upper end and the lower end of the extrusion part, and the heating components are used for heating raw materials in the extrusion part; the two sides of the extrusion piece are connected with temperature detection assemblies. The technical scheme provided by the utility model has the beneficial technical effects that in the extrusion process, raw materials are fed into an extrusion piece; and the heating assembly starts to work to heat the raw materials. The temperature detection assembly monitors the temperature of the raw materials in real time and feeds data back to the control system. The control system adjusts the working state of the heating assembly according to data provided by the temperature detection assembly so as to ensure the stability and uniformity of the temperature of the raw materials. The problems that in the prior art, raw materials are heated at the input end of an extrusion device, due to the influence of actual working conditions, the temperature of the extrusion end does not reach the standard, and consequently the quality of extrusion forming is uneven are solved.

Description

Technical Field

[0001] This utility model relates to the field of PVC sheaths, specifically to a temperature compensation device for a PVC sheath screw extrusion mechanism. Background Technology

[0002] PVC sheaths possess excellent insulation properties, making them suitable for the outer layer protection of wires and cables. They are resistant to ultraviolet radiation and high temperatures, have excellent flame retardancy, and are inexpensive. Therefore, PVC sheaths are a widely used protective outer layer material in cables, wires, pipes, and other fields.

[0003] During the production of PVC sheaths, raw materials need to be mixed in a specific ratio. Then, a high-speed mixer is used to thoroughly mix PVC resin, plasticizers, and stabilizers, raising the temperature to 100-120℃. A cooling mixer is then used to lower the temperature to 40-50℃ to prevent clumping, facilitating subsequent extrusion. Using a single-screw or twin-screw extruder, the mixed PVC material is melted and extruded to coat the surface of the cable or pipe. After exiting the extruder, the sheath immediately enters a cooling water tank to prevent deformation. Finally, after appropriate testing, it is packaged and wound up.

[0004] Existing technologies typically heat the raw material at the input end of the extrusion device. However, due to the influence of actual working conditions, the temperature at the extrusion end may not meet the standards, resulting in inconsistent quality of the extruded molding.

[0005] Therefore, it is very necessary to provide a temperature compensation device for a PVC sheathed screw extrusion mechanism to solve the above-mentioned technical problems. Utility Model Content

[0006] Based on the above description, this utility model provides a temperature compensation device for a PVC sheath screw extrusion mechanism to solve the problem that in the prior art, the raw material is heated at the input end of the extrusion device, but due to the influence of actual working conditions, the temperature at the extrusion end may not meet the standard, resulting in inconsistent quality of extrusion molding.

[0007] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A temperature compensation device for a PVC sheath screw extrusion mechanism includes an extruder and a temperature compensation component connected to the extruder. The temperature compensation component includes heating components connected to the upper and lower ends of the extruder. The heating components are used to heat the raw material inside the extruder. Temperature detection components are connected to both sides of the extruder. The temperature detection components are used to detect the temperature of the raw material inside the extruder.

[0008] Furthermore, it also includes a preheating component, which includes a support base and a heating box connected to the support base. The upper end of the heating box is connected to a feed cylinder. One end of the feed cylinder has a feed cylinder port, and the other end of the feed cylinder has a discharge cylinder port. The feed cylinder is connected to the heating box through the discharge cylinder port. The heating box is connected to a discharge pipe, which is connected to the feed end of the extruder.

[0009] Furthermore, it also includes a feeding limiting component, which includes a rotating rod rotatably connected to the feeding cylinder. One end of the rotating rod is connected to a limiting motor, which is connected to the feeding cylinder. A stop block is connected to the rotating rod. When the stop block rotates to a position directly above the outlet of the discharge cylinder, it closes the outlet of the discharge cylinder.

[0010] Furthermore, it also includes a telescopic cylinder connected below the heating box and a preheating temperature sensor connected to the discharge pipe. The telescopic cylinder has a movable piston connected to its telescopic end. The movable piston is connected inside the heating box. The telescopic cylinder is used to retract when the preheating temperature sensor detects that the temperature has not reached the preset temperature, so as to increase the heating time of the raw material in the heating box.

[0011] Furthermore, the extruder includes a base and a twin screw rotatably connected to the base. A drive unit is connected to the base, and the drive unit is electrically connected to a controller.

[0012] Furthermore, the heating assembly includes two first heaters connected to the upper and lower sides of the seat body, both of which are electrically connected to the controller. The two first heaters are used to heat the raw materials near the inlet of the seat body. The temperature detection assembly includes two first temperature sensors connected to the left and right sides of the seat body, both of which are electrically connected to the controller.

[0013] Furthermore, the heating assembly includes two second heaters connected to the upper and lower sides of the seat body, both of which are electrically connected to the controller. The two second heaters are used to control subsequent heaters to perform temperature compensation when the first temperature sensor detects that the temperature has not reached the preset temperature. The temperature detection assembly includes two second temperature sensors connected to the left and right sides of the seat body, both of which are electrically connected to the controller.

[0014] Furthermore, the heating assembly includes two third heaters connected to the upper and lower sides of the seat body. Both third heaters are electrically connected to the controller. The two third heaters are used to control subsequent heaters to perform temperature compensation when the second temperature sensor detects that the temperature has not reached the preset temperature. The temperature detection assembly includes two third temperature sensors connected to the left and right sides of the seat body. Both third temperature sensors are electrically connected to the controller.

[0015] Furthermore, the heating assembly includes two fourth heaters connected to the upper and lower sides of the seat body. Both fourth heaters are electrically connected to the controller. The two fourth heaters are used to control the drive component to reduce the drive speed when the third temperature sensor detects that the temperature has not reached the preset temperature. The temperature detection assembly includes two fourth temperature sensors connected to the left and right sides of the seat body. Both fourth temperature sensors are electrically connected to the controller.

[0016] Furthermore, it also includes a first discharge switch valve and a second discharge switch valve connected to one end of the base body. When the fourth temperature sensor detects that the temperature has not reached the preset temperature, the first discharge switch valve is opened to recover the raw material that has not reached the preset temperature for reheating and extrusion next time. When the fourth temperature sensor detects that the temperature has reached the preset temperature, the second switch valve is opened to extrude the raw material.

[0017] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0018] During extrusion, the raw material is fed into the extruder. The heating element then activates to heat the material. A temperature detection element monitors the material temperature in real time and feeds the data back to the control system. Based on the data provided by the temperature detection element, the control system adjusts the operating status of the heating element to ensure the stability and uniformity of the material temperature. This solves the problem in existing technologies where the raw material is heated at the input end of the extrusion unit, which, due to the influence of actual operating conditions, results in substandard temperatures at the extrusion end, leading to inconsistent extrusion quality. Attached Figure Description

[0019] Figure 1 One of the overall structural schematic diagrams of a temperature compensation device for a PVC sheathed screw extrusion mechanism provided in this utility model embodiment;

[0020] Figure 2 A second schematic diagram of the overall structure of a temperature compensation device for a PVC sheath screw extrusion mechanism provided in this embodiment of the present invention;

[0021] Figure 3This is a top view schematic diagram of a temperature compensation device for a PVC sheathed screw extrusion mechanism provided in an embodiment of this utility model;

[0022] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure at point AA;

[0023] Figure 5 for Figure 3 A schematic diagram of the cross-sectional structure at point BB.

[0024] The attached diagram lists the components represented by each number as follows:

[0025] 1. Extrusion part; 11. Base; 12. Twin screw; 13. Drive component; 14. First discharge switch valve; 15. Second discharge switch valve;

[0026] 2. Temperature compensation component; 21. Heating assembly; 211. First heater; 212. Second heater; 213. Third heater; 214. Fourth heater; 22. Temperature detection assembly; 221. First temperature sensor; 222. Second temperature sensor; 223. Third temperature sensor; 224. Fourth temperature sensor;

[0027] 3. Preheating component; 31. Support base; 32. Heating box; 33. Feed cylinder; 34. Feed cylinder inlet; 35. Discharge cylinder inlet; 36. Discharge pipe; 37. Feed limiting component; 371. Rotating rod; 372. Limiting motor; 373. Stop block; 38. Telescopic cylinder; 381. Moving piston; 39. Preheating temperature sensor. Detailed Implementation

[0028] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0030] It is understood that spatial relation terms such as "below," "under," "below," "below," "above," "above," etc., can be used here to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as "below" or "below" of the other element or feature will be oriented "above" the other element or feature. Therefore, the exemplary terms "below" and "below" can include both upper and lower orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0031] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediary element. In the following embodiments, "connection" should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have the transmission of electrical signals or data between them.

[0032] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0033] like Figures 1 to 5 As shown, a temperature compensation device for a PVC sheathed screw extrusion mechanism includes an extruder 1 and a temperature compensation component 2 connected to the extruder 1. The temperature compensation component 2 includes heating components 21 connected to the upper and lower ends of the extruder 1, which are used to heat the raw material inside the extruder 1. Temperature detection components 22 are connected to both sides of the extruder 1, which are used to detect the temperature of the raw material inside the extruder 1.

[0034] In this embodiment, the extruder 1 is the main component of the PVC extrusion molding process, used to extrude the raw material. That is, the raw material is heated inside the extruder 1 and then extruded to complete the extrusion molding process. The temperature compensation component 2 is connected to the extruder 1 and is used to precisely control the temperature inside the extruder 1 to ensure the stability and uniformity of the extrusion molding process. The heating assembly 21 is connected to the upper and lower ends of the extruder 1. Its main function is to heat the raw material inside the extruder 1, ensuring that the raw material maintains an appropriate temperature during extrusion, thereby facilitating extrusion and achieving the required physical and chemical properties. The temperature detection assembly 22 is connected to both sides of the extruder 1 and is used to monitor the temperature of the raw material inside the extruder 1 in real time. Through a feedback mechanism, the temperature detection assembly 22 can help adjust the working state of the heating assembly 21 to ensure that the raw material temperature remains within a predetermined range. The working process of this application is as follows: During the extrusion process, the raw material is fed into the extruder 1; the heating assembly 21 starts working to heat the raw material; the temperature detection assembly 22 monitors the temperature of the raw material in real time and feeds the data back to the control system; the control system adjusts the working state of the heating assembly 21 according to the data provided by the temperature detection assembly 22 to ensure the stability and uniformity of the raw material temperature. This invention solves the problem in existing technologies where the raw material is heated at the input end of the extrusion device. However, due to the influence of actual operating conditions, the temperature at the extrusion end may not meet the standards, resulting in inconsistent extrusion quality. Furthermore, the controller in this application is a well-known technology to those skilled in the art, comprising a processor, a temperature detection module, a heating module, and a communication interface, which will not be elaborated upon here.

[0035] In some embodiments, a preheating component 3 is further included. The preheating component 3 includes a support base 31 and a heating box 32 connected to the support base 31. A feed cylinder 33 is connected to the upper end of the heating box 32. One end of the feed cylinder 33 has a feed inlet 34 and the other end has a discharge outlet 35. The feed cylinder 33 is connected to the heating box 32 through the discharge outlet 35. A discharge pipe 36 is connected to the heating box 32 and is connected to the feed end of the extruder 1.

[0036] In this embodiment, the support base 31 is the basic part of the preheating component 3, used to support and fix the heating box 32. The heating box 32 is the core part of the preheating component 3, used to preheat the raw materials. A heating plate is connected to the heating box 32. See also... Figure 1As shown, the heating plate element is sleeved on the heating box 32. The feed cylinder 33 is the channel for the raw material to enter the preheating component 3. One end of the feed cylinder 33 has a feed inlet 34 for receiving the raw material; the other end of the feed cylinder 33 has a discharge outlet 35, which is connected to the heating box 32. The discharge pipe 36 is the connection channel between the preheating component 3 and the extruder 1. One end of the discharge pipe 36 is connected to the heating box 32 for receiving the preheated raw material; the other end of the discharge pipe 36 is connected to the feed end of the extruder 1, which feeds the preheated raw material into the extruder 1 for further processing.

[0037] In some embodiments, a feed limiting member 37 is further included. The feed limiting member 37 includes a rotating rod 371 rotatably connected to the feed cylinder 33. One end of the rotating rod 371 is connected to a limiting motor 372, which is connected to the feed cylinder 33. A stop block 373 is connected to the rotating rod 371. When the stop block 373 rotates to a position directly above the discharge cylinder opening 35, it closes the discharge cylinder opening 35.

[0038] In this embodiment, the rotating rod 371 is rotatably connected to the feed cylinder 33, and the rotating rod 371 can move the stop block 373 to a position directly above the discharge cylinder opening 35. The limit motor 372 is the power source for driving the rotating rod 371 to rotate, and is connected to the feed cylinder 33 and the rotating rod 371. The stop block 373 is connected to the rotating rod 371 and is used to close the discharge cylinder opening 35 when needed. The design of the stop block 373 should ensure that it can fit tightly against the discharge cylinder opening 35 to prevent the raw material from leaking out when it is fully heated.

[0039] In some embodiments, the device further includes a telescopic cylinder 38 connected below the heating chamber 32 and a preheating temperature sensor 39 connected to the discharge pipe 36. The telescopic cylinder 38 is connected to a movable piston 381 at its telescopic end. The movable piston 381 is connected inside the heating chamber 32. The telescopic cylinder 38 is used to retract when the preheating temperature sensor 39 detects that the temperature has not reached the preset temperature, so as to increase the heating time of the raw material in the heating chamber 32.

[0040] In this embodiment, a telescopic cylinder 38 is connected below the heating chamber 32, and its telescopic end is connected to a movable piston 381. The movable piston 381 is the output end of the telescopic cylinder 38, and it moves within the heating chamber 32 as the telescopic cylinder 38 extends and retracts. The movable piston 381 can fit tightly against the inner wall of the heating chamber 32 to prevent leakage of raw materials during preheating, such as by using a nickel-based high-temperature alloy for the piston body. A preheating temperature sensor 39 is connected to the discharge pipe 36 to monitor the temperature of the raw materials flowing out of the heating chamber 32 in real time. When the preheating temperature sensor 39 detects that the temperature of the raw materials has not reached the preset temperature, it sends a signal to the controller, triggering the action of the telescopic cylinder 38.

[0041] In some embodiments, the extruder 1 includes a base 11 and a twin screw 12 rotatably connected within the base 11. A drive 13 is connected to the base 11, and the drive 13 is electrically connected to a controller.

[0042] In this embodiment, the base 11 can accommodate the twin screw 12, which consists of two meshing screws forming multiple mixing zones for mixing raw materials. The drive unit 13 is the power source that drives the twin screw 12 to rotate.

[0043] In some embodiments, the heating assembly 21 includes two first heaters 211 connected to the upper and lower sides of the seat 11, both of which are electrically connected to the controller. The two first heaters 211 are used to heat the raw material near the inlet of the seat 11. The temperature detection assembly 22 includes two first temperature sensors 221 connected to the left and right sides of the seat 11, both of which are electrically connected to the controller.

[0044] In this embodiment, the first heater 211 is connected to the upper and lower sides of the base 11 and is located above the twin screw 12, enabling it to fully heat the raw material. The first temperature sensor 221, a temperature detection component 22, is connected to the left and right sides of the base 11. Both first temperature sensors 221 are electrically connected to the controller, allowing them to feed back real-time temperature data to the controller. During operation, the raw material is preheated by the preheating component 3 and then enters the base 11 of the extruder 1. The controller sends a command to the first heater 211 to start the heating process. The two first heaters 211 simultaneously heat the raw material near the inlet of the base 11, ensuring that the raw material is heated quickly and evenly. The first temperature sensors 221 monitor the temperature change of the raw material in real time and feed back the temperature data to the controller. When the temperature of the raw material reaches the preset extrusion temperature, the controller controls the drive component 13 to start the rotation of the twin screw 12.

[0045] In some embodiments, the heating assembly 21 includes two second heaters 212 connected to the upper and lower sides of the seat 11, both of which are electrically connected to the controller. The two second heaters 212 are used to control subsequent heaters to perform temperature compensation when the first temperature sensor 221 detects that the temperature has not reached the preset temperature. The temperature detection assembly 22 includes two second temperature sensors 222 connected to the left and right sides of the seat 11, both of which are electrically connected to the controller.

[0046] In this embodiment, the second heater 212 is connected to the upper and lower sides of the base 11, complementing the first heater 211. When the first temperature sensor 221 detects that the temperature has not reached the preset temperature, it can replenish the temperature. The second temperature sensor 222 is connected to the left and right sides of the base 11.

[0047] In some embodiments, the heating assembly 21 includes two third heaters 213 connected to the upper and lower sides of the seat 11. Both third heaters 213 are electrically connected to the controller. The two third heaters 213 are used to control subsequent heaters to perform temperature compensation when the second temperature sensor 222 detects that the temperature has not reached the preset temperature. The temperature detection assembly 22 includes two third temperature sensors 223 connected to the left and right sides of the seat 11. Both third temperature sensors 223 are electrically connected to the controller.

[0048] In this embodiment, the third heater 213 is connected to the upper and lower sides of the base 11, forming a tiered heating system with the second heater 212 and the first heater 211, enabling more stable and precise heating. The third temperature sensor 223 is connected to the left and right sides of the base 11.

[0049] In some embodiments, the heating assembly 21 includes two fourth heaters 214 connected to the upper and lower sides of the seat 11. Both fourth heaters 214 are electrically connected to the controller. When the third temperature sensor 223 detects that the temperature has not reached the preset temperature, the two fourth heaters 214 are used to control the drive component 13 to reduce the driving speed by the controller. The temperature detection assembly 22 includes two fourth temperature sensors 224 connected to the left and right sides of the seat 11. Both fourth temperature sensors 224 are electrically connected to the controller.

[0050] In this embodiment, the fourth heater 214 is connected to the upper and lower sides of the base 11, further complementing the other heaters to form a multi-layered, independent heating system. After being electrically connected to the controller, the fourth heater 214 can respond to the controller's commands to heat the material. The main function of the fourth heater 214 is not to directly heat the raw material, but to maintain a certain heating state to prepare for possible temperature compensation. When the third temperature sensor 223 detects that the raw material temperature has not reached the preset temperature, the controller will not immediately start the fourth heater 214 to heat the material, but will instead adjust the driving speed of the drive component 13 to increase the heating time. The fourth temperature sensor 224 is the end part of the temperature detection component 22, connected to the left and right sides of the base 11. After being electrically connected to the controller, the fourth temperature sensor 224 can feed back real-time temperature data to the controller.

[0051] In some embodiments, a first discharge valve 14 and a second discharge valve 15 are connected to one end of the base 11. When the fourth temperature sensor 224 detects that the temperature has not reached the preset temperature, the first discharge valve 14 is opened to recycle the raw material that has not reached the preset temperature for reheating and extrusion next time. When the fourth temperature sensor 224 detects that the temperature has reached the preset temperature, the second discharge valve 15 is opened to extrude the raw material.

[0052] In this embodiment, when the fourth temperature sensor 224 detects that the raw material temperature has not reached the preset temperature, the first discharge valve 14 will open. After opening, the raw material that has not reached the preset temperature will be guided to the recycling end instead of continuing to enter the extrusion molding stage. When the fourth temperature sensor 224 detects that the raw material temperature has reached the preset temperature, the second discharge valve 15 will open.

[0053] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0054] During extrusion, the raw material is fed into the extruder. The heating element then activates to heat the material. A temperature detection element monitors the material temperature in real time and feeds the data back to the control system. Based on the data provided by the temperature detection element, the control system adjusts the operating status of the heating element to ensure the stability and uniformity of the material temperature. This solves the problem in existing technologies where the raw material is heated at the input end of the extrusion unit, which, due to the influence of actual operating conditions, results in substandard temperatures at the extrusion end, leading to inconsistent extrusion quality.

[0055] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A temperature compensation device for a PVC sheathed screw extrusion mechanism, characterized in that, The extruder (1) includes a temperature compensation component (2) connected to the extruder (1). The temperature compensation component (2) includes a heating assembly (21) connected to the upper and lower ends of the extruder (1). The heating assembly (21) is used to heat the raw material inside the extruder (1). Temperature detection components (22) are connected to both sides of the extruder (1). The temperature detection components (22) are used to detect the temperature of the raw material inside the extruder (1).

2. The temperature compensation device for a PVC sheathed screw extrusion mechanism according to claim 1, characterized in that, It also includes a preheating component (3), which includes a support base (31) and a heating box (32) connected to the support base (31). The upper end of the heating box (32) is connected to a feed cylinder (33). One end of the feed cylinder (33) is provided with a feed cylinder port (34), and the other end of the feed cylinder (33) is provided with a discharge cylinder port (35). The feed cylinder (33) is connected to the heating box (32) through the discharge cylinder port (35). The heating box (32) is connected to a discharge pipe (36), and the discharge pipe (36) is connected to the feed end of the extruder (1).

3. The temperature compensation device for a PVC sheathed screw extrusion mechanism according to claim 2, characterized in that, It also includes a feed limiting component (37), which includes a rotating rod (371) rotatably connected to the feed cylinder (33). One end of the rotating rod (371) is connected to a limiting motor (372), which is connected to the feed cylinder (33). A stop block (373) is connected to the rotating rod (371). When the stop block (373) rotates to a position directly above the discharge cylinder opening (35), it closes the discharge cylinder opening (35).

4. The temperature compensation device for a PVC sheathed screw extrusion mechanism according to claim 2, characterized in that, It also includes a telescopic cylinder (38) connected below the heating box (32) and a preheating temperature sensor (39) connected to the discharge pipe (36). The telescopic cylinder (38) has a movable piston (381) connected to its telescopic end. The movable piston (381) is connected inside the heating box (32). The telescopic cylinder (38) is used to retract when the preheating temperature sensor (39) detects that the temperature has not reached the preset temperature, so as to increase the heating time of the raw material in the heating box (32).

5. The temperature compensation device for a PVC sheathed screw extrusion mechanism according to claim 1, characterized in that, The extruder (1) includes a base (11) and a twin screw (12) rotatably connected in the base (11). A drive (13) is connected to the base (11), and the drive (13) is electrically connected to a controller.

6. A temperature compensation device for a PVC sheathed screw extrusion mechanism according to claim 5, characterized in that, The heating assembly (21) includes two first heaters (211) connected to the upper and lower sides of the seat (11). Both first heaters (211) are electrically connected to the controller. The two first heaters (211) are used to heat the raw material near the inlet of the seat (11). The temperature detection assembly (22) includes two first temperature sensors (221) connected to the left and right sides of the seat (11). Both first temperature sensors (221) are electrically connected to the controller.

7. A temperature compensation device for a PVC sheathed screw extrusion mechanism according to claim 6, characterized in that, The heating assembly (21) includes two second heaters (212) connected to the upper and lower sides of the seat (11). Both second heaters (212) are electrically connected to the controller. The two second heaters (212) are used to control the subsequent heaters to perform temperature compensation when the first temperature sensor (221) detects that the temperature has not reached the preset temperature. The temperature detection assembly (22) includes two second temperature sensors (222) connected to the left and right sides of the seat (11). Both second temperature sensors (222) are electrically connected to the controller.

8. The temperature compensation device for a PVC sheathed screw extrusion mechanism according to claim 7, characterized in that, The heating assembly (21) includes two third heaters (213) connected to the upper and lower sides of the seat (11). Both third heaters (213) are electrically connected to the controller. The two third heaters (213) are used to control the subsequent heaters to perform temperature compensation when the second temperature sensor (222) detects that the temperature has not reached the preset temperature. The temperature detection assembly (22) includes two third temperature sensors (223) connected to the left and right sides of the seat (11). Both third temperature sensors (223) are electrically connected to the controller.

9. A temperature compensation device for a PVC sheathed screw extrusion mechanism according to claim 8, characterized in that, The heating assembly (21) includes two fourth heaters (214) connected to the upper and lower sides of the seat (11). Both fourth heaters (214) are electrically connected to the controller. The two fourth heaters (214) are used to control the drive unit (13) to reduce the drive speed when the third temperature sensor (223) detects that the temperature has not reached the preset temperature. The temperature detection assembly (22) includes two fourth temperature sensors (224) connected to the left and right sides of the seat (11). Both fourth temperature sensors (224) are electrically connected to the controller.

10. A temperature compensation device for a PVC sheathed screw extrusion mechanism according to claim 9, characterized in that, It also includes a first discharge switch valve (14) and a second discharge switch valve (15) connected to one end of the seat (11). When the fourth temperature sensor (224) detects that the temperature has not reached the preset temperature, the first discharge switch valve (14) is opened to recycle the raw material that has not reached the preset temperature for reheating and extrusion next time. When the fourth temperature sensor (224) detects that the temperature has reached the preset temperature, the second switch valve (15) is opened to extrude the raw material.

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