Extrusion molding device for CPVC (Chlorinated Polyvinyl Chloride) electric sheath tube

Abstract

The utility model discloses a CPVC (Chlorinated Polyvinyl Chloride) electric power sheath tube extrusion molding device, which belongs to the technical field of cable conduits, and is characterized in that inner and outer lubricants, a heat stabilizer and CPVC particle raw materials are poured into a stirring device for stirring and hot melting to obtain CPVC hot melting raw materials, and then the CPVC hot melting raw materials are input into an extrusion tube for extrusion operation to obtain the CPVC electric power sheath tube. Meanwhile, the heating assembly ensures that the temperature in the extrusion pipe is appropriate, a blade notch is formed in a spiral blade, intermittent shear force can be generated on the CPVC hot melting raw materials in the conveying process through the blade notch, the CPVC hot melting raw materials are forced to roll and mix, solid-liquid phase forced separation is conducted on the CPVC hot melting raw materials, the structure can provide better dispersity, and therefore the CPVC hot melting raw materials can be effectively separated. And material retention can be reduced, degradation caused by local overheating of the raw materials is avoided, finally, the extruded CPVC hot melting raw materials are cooled and plasticized under the cooperation of the sleeve and the core mold, and extrusion molding of the PVC electric power sheath pipe is completed.

Description

Technical Field

[0001] This utility model belongs to the field of cable duct technology, specifically relating to a CPVC power sheath extrusion molding device. Background Technology

[0002] Currently, the main process for manufacturing plastic pipes involves heating and plasticizing plastic raw materials using an extruder, then forming them through a die head to obtain the desired pipe.

[0003] When processing CPVC material, it needs to be molded at a higher processing temperature, usually 20-30°C higher than ordinary PVC, with a melting temperature range of 190-230°C, and its melt viscosity is high.

[0004] Existing pipe extrusion equipment suffers from several problems when extruding CPVC material. Due to the high viscosity and poor flowability of CPVC melt, the CPVC melt tends to remain within the extrusion unit, leading to thermal degradation of the material due to prolonged residence time. Utility Model Content

[0005] To address the problems mentioned in the background art, this utility model provides a CPVC power sheath extrusion molding device to solve the problems of CPVC melt retention in the extrusion device and the thermal degradation of the material due to excessive retention time when the existing pipe extrusion device extrudes CPVC material.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A CPVC power cable sheath extrusion molding apparatus, comprising:

[0008] A mixing device; the mixing device is equipped with a feed inlet and a discharge outlet. The mixing device is used to mix and melt the CPVC granular raw material input through the feed inlet, and output the mixed and melted CPVC hot melt raw material from the discharge outlet.

[0009] Extrusion tube; The extrusion tube is arranged horizontally, with the first end of the extrusion tube being a closed end and the second end of the extrusion tube being an open end. An input through hole is provided on the side wall of the first end of the extrusion tube, with the input through hole facing the discharge port. The discharge port is connected to the input through hole, and a heating component is provided inside the tube wall of the extrusion tube.

[0010] First motor; The first motor is fixedly installed. A stirring through hole is provided at the center of the end face of the first end of the extrusion tube. The first end of the rotating shaft of the first motor passes through the stirring through hole and is installed in the extrusion tube. Multiple spiral blades connected end to end are provided on the first end of the rotating shaft. The rotating shaft and the extrusion tube are arranged parallel to each other. Each spiral blade is provided with at least one blade notch. When the motor rotates, the spiral blades push the material in the extrusion tube from the first end to the second end of the extrusion tube.

[0011] The sleeve includes a first inner diameter section and a second inner diameter section that are interconnected. The first inner diameter section is located inside the first end of the sleeve and is connected to the second end of the extruded tube. The inner diameter of the first inner diameter section is larger than the outer diameter of the CPVC power sheath tube, and the inner diameter of the second inner diameter section is equal to the outer diameter of the CPVC power sheath tube. A refrigeration component is provided inside the tube wall at the second end of the sleeve.

[0012] The core mold is a rod-shaped structure with the same diameter as the inner diameter of the CPVC power sheath. The first end of the core mold is a tapered end, which is fixedly set in the first inner diameter section by a fixing bracket. The second end of the core mold is inserted into the second inner diameter section. The central axis of the core mold is on the same straight line as the central axis of the sheath.

[0013] Preferably, the stirring device includes:

[0014] A mixing drum; the feed inlet is located at the top of the mixing drum, the discharge outlet is located at the bottom of the mixing drum, and an electric heating plate is installed inside the drum wall;

[0015] The second motor is fixedly installed at the top of the mixing drum. The stirring shaft of the second motor passes through the center of the top surface of the mixing drum and is set inside the mixing drum. The stirring shaft is parallel to the inner side of the mixing drum. A spiral stirring blade is fixedly installed on the outside of the stirring shaft. When the second motor starts and the stirring shaft rotates, the spiral stirring blade drives some of the material inside the mixing drum to move towards the first end of the mixing drum.

[0016] Discharge pipe; the first end of the discharge pipe is connected to the discharge port of the mixing drum, the second end of the discharge pipe is connected to the input through hole, and a valve is installed inside the first end of the discharge pipe.

[0017] Preferably, the extrusion tube comprises:

[0018] Pipe body; the discharge port is located at the first end of the pipe body;

[0019] Bearing; The bearing is installed in the input through hole, the outer ring of the bearing is fixedly connected to the inner wall of the input through hole, and the inner ring of the bearing is fitted onto the rotating shaft;

[0020] Heating wire; the tube body has a pipe spirally wound from the first end of the tube body to the second end of the tube body, and the heating wire is placed in the pipe.

[0021] Preferably, the cooling component is a semiconductor refrigeration chip.

[0022] Preferably, under the heating state of the heating wire, the temperature range inside the tube is 190-230℃.

[0023] Preferably, the helical blades and the rotating shaft form a screw structure, wherein the width of the blade notch is 20-30% of the pitch and the depth is 30%-50% of the groove depth.

[0024] Preferably, the screw pitch of the screw structure is 80-120mm, and each helical blade has 5-6 blade notches.

[0025] Compared with the prior art, the beneficial effects of this utility model are:

[0026] This application involves mixing and melting internal and external lubricants, heat stabilizers, and CPVC granular raw materials in a stirring device to obtain CPVC hot-melt raw materials. These raw materials are then fed into an extrusion tube for extrusion. Simultaneously, a heating element ensures a suitable temperature within the extrusion tube. The spiral blades of this application have notches, which generate intermittent shear force on the CPVC hot-melt raw materials during transport, forcing them to tumble and mix, thus achieving forced solid-liquid phase separation. This structure provides better dispersibility, reduces material retention, and prevents localized overheating and degradation. Finally, the extruded CPVC hot-melt raw materials are cooled and plasticized with the cooperation of a sleeve and a mandrel, completing the extrusion molding of the PVC power sheath. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the specific structure of this application;

[0028] The diagram is marked as follows:

[0029] 1-Second motor; 2-Stirring drum; 3-Spiral stirring blade; 4-Valve; 5-Heating component; 6-Shell; 7-Refrigeration component; 8-Core mold; 9-Fixing frame; 10-Rotating shaft; 11-Spiral blade; 12-Extrusion tube; 13-Bearing; 14-First motor; 15-Discharge tube; 16-Heating plate; 17-Stirring shaft; 18-Feed funnel. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Example 1

[0032] like Figure 1 As shown, a CPVC power sheath extrusion molding apparatus includes:

[0033] A mixing device; the mixing device is equipped with a feed inlet and a discharge outlet. The mixing device is used to mix and melt the CPVC granular raw material input through the feed inlet, and output the mixed and melted CPVC hot melt raw material from the discharge outlet.

[0034] Extrusion tube 12; Extrusion tube 12 is arranged horizontally, the first end of extrusion tube 12 is a closed end, the second end of extrusion tube 12 is an open end, an input through hole is provided on the side wall of the first end of extrusion tube 12, the input through hole is set facing the discharge port, the discharge port is connected to the input through hole, and a heating component 5 is provided inside the tube wall of extrusion tube 12.

[0035] First motor 14; First motor 14 is fixedly installed. A stirring through hole is provided at the center of the end face of the first end of the extrusion tube 12. The first end of the rotating shaft 10 of the first motor 14 passes through the stirring through hole and is installed in the extrusion tube 12. Multiple spiral blades 11 connected end to end are provided on the first end of the rotating shaft 10. The rotating shaft 10 and the extrusion tube 12 are arranged parallel to each other. Each spiral blade 11 is provided with at least one blade notch. When the motor rotates, the spiral blades 11 push the material in the extrusion tube 12 from the first end to the second end of the extrusion tube 12.

[0036] Sleeve 6; Sleeve 6 includes a first inner diameter section and a second inner diameter section that are interconnected. The first inner diameter section is located inside the first end of sleeve 6 and is connected to the second end of extrusion tube 12. The inner diameter of the first inner diameter section is larger than the outer diameter of CPVC power sheath tube. The inner diameter of the second inner diameter section is equal to the outer diameter of CPVC power sheath tube. A refrigeration component 7 is provided inside the tube wall at the second end of sleeve 6.

[0037] Mandrel 8; Mandrel 8 is a rod-shaped structure. The diameter of mandrel 8 is the same as the inner diameter of CPVC power sheathing pipe. The first end of mandrel 8 is a tapered end. The tapered end of mandrel 8 is fixedly set in the first inner diameter section by a fixing bracket 9. The fixing bracket includes two connecting rods. One end of each connecting rod is fixedly connected to the inner wall of the first inner diameter section, and the other end is fixedly connected to the first end of mandrel 8. The second end of mandrel 8 is inserted into the second inner diameter section. The central axis of mandrel 8 is on the same straight line as the central axis of sleeve 6.

[0038] In this embodiment, the present application obtains CPVC hot melt raw material by pouring internal and external lubricants, heat stabilizers and CPVC granular raw materials into a stirring device for stirring and melting. The CPVC hot melt raw material is then fed into the extrusion tube 12 for extrusion. At the same time, the heating component 5 ensures that the temperature inside the extrusion tube 12 is suitable. The spiral blade 11 of the present application has blade notches. Through the blade notches, intermittent shear force can be generated on the CPVC hot melt raw material during the conveying process, forcing the CPVC hot melt raw material to tumble and mix, so that the CPVC hot melt raw material undergoes forced solid-liquid phase separation. This structure can provide better dispersibility and reduce material retention, avoiding local overheating of the raw material leading to degradation. Finally, the extruded CPVC hot melt raw material is cooled and plasticized with the cooperation of the sleeve 6 and the core mold 8 to complete the extrusion molding of CPVC power sheathing tube.

[0039] Example 2

[0040] The difference between this embodiment and Embodiment 1 is that, as Figure 1 As shown, the stirring device includes:

[0041] Mixing drum 2; The feed inlet is located at the top of the mixing drum 2, and a feed funnel 18 is inserted into the feed inlet. The discharge outlet is located at the bottom of the mixing drum 2. An electric heating plate 16 is installed inside the drum wall of the mixing drum 2. The power cord of the electric heating plate 16 passes through the drum wall and is connected to the power switch.

[0042] Second motor 1; Second motor 1 is fixedly installed at the top of the mixing drum 2. The stirring shaft 17 of the second motor 1 passes through the center of the top surface of the mixing drum 2 and is set inside the mixing drum 2. The stirring shaft 17 is parallel to the inner side of the mixing drum 2. A spiral stirring blade 3 is fixedly installed on the outside of the stirring shaft 17. When the second motor 1 starts the stirring shaft 17 to rotate, the spiral stirring blade 3 drives some of the material inside the mixing drum 2 to move towards the first end of the mixing drum 2.

[0043] Discharge pipe 15; the first end of discharge pipe 15 is connected to the discharge port of mixing drum 2, the second end of discharge pipe 15 is connected to the input through hole, and a valve 4 is provided inside the first end of discharge pipe 15.

[0044] In this embodiment, the stirring shaft 17 of this application is a blade helical rod structure, which can rotate under the drive of the second motor 1. At the same time, during the rotation, it will drive the raw material at the bottom of the stirring drum 2 upward, so that the raw material in the stirring drum 2 can be fully mixed and melted.

[0045] Example 3

[0046] The difference between this embodiment and Embodiment 1 is that, as Figure 1 As shown, the extrusion tube 12 includes:

[0047] Pipe body; the discharge port is located at the first end of the pipe body;

[0048] Bearing 13; Bearing 13 is disposed in the input through hole, the outer ring of bearing 13 is fixedly connected to the inner wall of the input through hole, and the inner ring of bearing 13 is fitted on the rotating shaft 10;

[0049] Heating wire; the tube body has a pipe spirally wound from the first end of the tube body to the second end of the tube body. The heating wire is placed in the pipe, and the power cord of the heating wire passes through the tube body and is connected to the power supply.

[0050] Example 4

[0051] The difference between this embodiment and embodiment 1 is that the cooling component 7 is a semiconductor cooling chip. In this application, three sets of semiconductor cooling chips arranged along the direction of the sleeve 6 are embedded in the tube wall at the second end of the sleeve 6. Each set of semiconductor cooling chips includes four semiconductor cooling chips evenly distributed along the axis of the sleeve 6.

[0052] In this embodiment, a thermoelectric cooler is a device that utilizes the thermoelectric effect of semiconductor materials to achieve cooling or heating. When direct current is passed through a thermocouple composed of two different semiconductor materials, such as N-type and P-type materials connected in series, heat is absorbed and released at the two ends of the thermocouple, thereby achieving the purpose of cooling. In this application, the cooling surface of the thermoelectric cooler faces the second inner diameter section of the sleeve 6, and the heating surface faces the outside of the sleeve 6. In this application, the power lines of all thermoelectric coolers pass through the wall of the sleeve 6 and are connected to the power switch. The cooling intensity can be precisely controlled by adjusting the direction and intensity of the current flowing through the thermoelectric cooler using the cooling switch. In this application, the cooling intensity of each group of thermoelectric coolers gradually increases from the first end to the second end of the sleeve 6, allowing the CPVC power sheath to gradually cool down and preventing cracks caused by sudden increases in temperature difference. Example

[0053] The difference between this embodiment and embodiment 3 is that, under the heating state of the heating wire, the temperature range inside the tube is 200°C.

[0054] In this embodiment, the melting temperature range of CPVC material is 190-230℃. Using a heating wire to heat the tube body can prevent the CPVC material from plasticizing during extrusion.

[0055] Example 6

[0056] The difference between this embodiment and embodiment 1 is that the spiral blade 11 and the rotating shaft 10 form a screw structure, wherein the width of the blade notch is 20-30% of the pitch and the depth is 30%-50% of the groove depth, the pitch of the screw structure is 80-120mm, and each spiral blade 11 has 5-6 blade notches.

[0057] In this embodiment, the intermittent shearing force generated on the material by the blade notch during the conveying process forces the material to tumble and mix, which can improve the mixing efficiency by about 30%, and is especially suitable for viscous materials.

Claims

1. A CPVC power sheath extrusion molding apparatus, characterized in that, include: A mixing device; the mixing device is equipped with a feed inlet and a discharge outlet. The mixing device is used to mix and melt the CPVC granular raw material input through the feed inlet, and output the mixed and melted CPVC hot melt raw material from the discharge outlet. Extrusion tube (12); The extrusion tube (12) is arranged horizontally. The first end of the extrusion tube (12) is a closed end, and the second end of the extrusion tube (12) is an open end. An input through hole is provided on the side wall of the first end of the extrusion tube (12). The input through hole faces the discharge port. The discharge port is connected to the input through hole. A heating component (5) is provided inside the tube wall of the extrusion tube (12). First motor (14); The first motor (14) is fixedly installed. A stirring through hole is provided at the center of the end face of the first end of the extrusion tube (12). The first end of the rotating shaft (10) of the first motor (14) passes through the stirring through hole and is installed in the extrusion tube (12). Multiple spiral blades (11) connected end to end are provided on the first end of the rotating shaft (10). The rotating shaft (10) and the extrusion tube (12) are arranged parallel to each other. Each spiral blade (11) is provided with at least one blade notch. When the motor rotates, the spiral blades (11) push the material in the extrusion tube (12) from the first end to the second end. Sleeve (6); Sleeve (6) includes a first inner diameter section and a second inner diameter section that are interconnected. The first inner diameter section is located inside the first end of sleeve (6) and is connected to the second end of extrusion tube (12). The inner diameter of the first inner diameter section is larger than the outer diameter of CPVC power sheath tube. The inner diameter of the second inner diameter section is equal to the outer diameter of CPVC power sheath tube. A refrigeration component (7) is provided inside the tube wall at the second end of sleeve (6). The core mold (8) is a rod-shaped structure. The diameter of the core mold (8) is the same as the inner diameter of the CPVC power sheath. The first end of the core mold (8) is a tapered end. The tapered end of the core mold (8) is fixed in the first inner diameter section by a fixing bracket (9). The second end of the core mold (8) is inserted into the second inner diameter section. The central axis of the core mold (8) is on the same straight line as the central axis of the sleeve (6).

2. The CPVC power sheath extrusion molding apparatus according to claim 1, characterized in that, The stirring device includes: A mixing drum (2); the feed inlet is located at the top of the mixing drum (2), the discharge outlet is located at the bottom of the mixing drum (2), and an electric heating plate (16) is installed inside the drum wall of the mixing drum (2). Second motor (1); The second motor (1) is fixedly installed at the top of the mixing drum (2). The stirring shaft (17) of the second motor (1) passes through the center of the top surface of the mixing drum (2) and is set inside the mixing drum (2). The stirring shaft (17) is parallel to the inner side of the mixing drum (2). A spiral stirring blade (3) is fixedly installed on the outside of the stirring shaft (17). When the second motor (1) starts the stirring shaft (17) to rotate, the spiral stirring blade (3) drives some of the material inside the mixing drum (2) to move towards the first end of the mixing drum (2). Discharge pipe (15); the first end of the discharge pipe (15) is connected to the discharge port of the mixing drum (2), the second end of the discharge pipe (15) is connected to the input through hole, and a valve (4) is provided inside the first end of the discharge pipe (15).

3. The CPVC power sheath extrusion molding apparatus according to claim 1, characterized in that, The extrusion tube (12) includes: Pipe body; the discharge port is located at the first end of the pipe body; Bearing (13); The bearing (13) is set in the input through hole, the outer ring of the bearing (13) is fixedly connected to the inner wall of the input through hole, and the inner ring of the bearing (13) is fitted on the rotating shaft (10); Heating wire; the tube body has a pipe spirally wound from the first end of the tube body to the second end of the tube body, and the heating wire is placed in the pipe.

4. The CPVC power sheath extrusion molding apparatus according to claim 1, characterized in that, The cooling component (7) is a semiconductor cooling chip.

5. The CPVC power sheath extrusion molding apparatus according to claim 3, characterized in that, When the heating element is in operation, the temperature range inside the tube is 190-230℃.

6. The CPVC power sheath extrusion molding apparatus according to claim 1, characterized in that, The spiral blade (11) and the rotating shaft (10) form a screw structure, wherein the width of the blade notch is 20-30% of the pitch and the depth is 30%-50% of the groove depth.

7. The CPVC power sheath extrusion molding apparatus according to claim 6, characterized in that, The screw structure has a pitch of 80-120mm, and each helical blade (11) has 5-6 blade notches.

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