Automatic screen changing device for PVC extruder
Patent Information
- Application Number
- CN202522434117.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-17
- Publication Date
- 2026-10-30
- Estimated Expiration
- 2035-11-17
AI Technical Summary
[0003]本实用新型的目的在于提供PVC挤出机自动换网装置，以解决上述背景技术中提出的滤网难以快速降温且不易取出的问题
[0012]采用上述技术方案，导流管贯穿导流筒内侧的设计可直接承接叶轮加速后的高压气流，减少气流在导流筒与导流管连接部位的压力损失，保证气流以较高压力输送至喷头，而喷头朝向滤网的设置能让高压气流精准直射滤网表面，快速带走滤网表面因接触高温熔融物料残留的热量，显著缩短滤网冷却时间，既提升换网效率，又降低操作人员接触高温滤网时的烫伤风险，同时避免冷却不彻底的滤网影响后续装配操作。
Smart Images
Figure CN224915323U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of PVC extrusion processing technology, specifically to an automatic screen changing device for PVC extruders. Background Technology
[0002] In the field of PVC extrusion molding, the extruder is the core equipment, and its melt filtration system directly affects the physical properties and surface quality of the product. The filter screen, as a key component of the filtration system, needs to continuously intercept impurities, unplasticized particles and foreign objects in the molten PVC. However, after long-term use, the filter screen is prone to clogging and must be replaced regularly by an automatic screen changing device to maintain extrusion efficiency and product quality. In current mainstream automatic screen changing devices for PVC extruders, the filter screen is typically installed in the functional slot of the mounting block via a snap-fit structure to achieve precise alignment with the molten material flow channel. However, in actual screen changing processes, two core issues significantly restrict production continuity and operational safety: Firstly, it is difficult to cool down the high-temperature molten material quickly when replacing the filter screen. The PVC melting processing temperature is usually maintained within a narrow window of 170-190℃, while the working temperature of the automatic screen changing device can reach up to 400℃. The filter screen is in direct contact with the high-temperature melt during the filtration process, and the molten material adhering to the surface is extremely hot. Existing devices lack a targeted rapid cooling structure, and it is necessary to wait for the filter screen to cool down naturally when replacing it. This not only prolongs the screen replacement cycle and reduces production efficiency, but also poses a risk of burns to operators due to the high-temperature filter screen surface, requiring additional insulating protective equipment and increasing the complexity of operation. Secondly, once the filter screen is locked and fixed inside the mounting block, it is not easy to remove. In order to ensure the sealing and stability during the filtration process, the gap between the filter screen and the mounting block is usually designed to be small. However, molten PVC has strong adhesiveness. Before the screen is replaced, some of the melt can easily seep into the gap between the filter screen and the mounting block. After cooling, it quickly solidifies to form a hard adhesive layer, which makes the filter screen and the mounting block tightly locked and difficult to remove. Therefore, developing an automatic screen changing device that can rapidly cool the filter screen while solving the problem of jamming and difficult removal has become an urgent technical need in the PVC extrusion processing field. Utility Model Content
[0003] The purpose of this invention is to provide an automatic screen changing device for PVC extruders, so as to solve the problems mentioned in the background art of the difficulty in quickly cooling down the filter screen and the difficulty in removing it.
[0004] To achieve the above objectives, this utility model provides the following technical solution: an automatic screen changing device for a PVC extruder, comprising a first mounting block, a second mounting block fixedly mounted on one side of the first mounting block by bolts, a mounting rod fixedly mounted on the outer surfaces of the first and second mounting blocks, and a mounting plate fixedly mounted on one end of the mounting rod, an electric push rod fixedly mounted on the outer surface of one side of the mounting plate, and a functional block fixedly connected to the inner and outer surfaces of the end of the electric push rod facing the first and second mounting blocks, and guide blocks fixedly mounted on the outer surfaces of both ends of the second mounting block; A mounting bracket is fixedly provided on the outer surface of the mounting plate facing the first mounting block and the second mounting block, and a motor is fixedly mounted on the outer surface of the mounting bracket, and a contact wheel is fixedly connected to one end of the output shaft of the motor. A guide tube is fixedly installed on the outer surface of the mounting rod, and an air inlet is opened on the lower surface of the end of the guide tube facing the contact wheel. An impeller is fixedly installed on the outer surface of the contact wheel facing the guide tube. One end of a guide pipe is fixedly connected to the upper surface of one end of the guide tube, and a nozzle is fixedly connected to the other end of the guide pipe.
[0005] Preferably, a filter screen is fitted onto the outer surface of the functional block, and the functional block extends through the outer surface of the opposite ends of the first mounting block and the second mounting block.
[0006] By adopting the above technical solution, it can be ensured that the filter screen is precisely connected to the flow channel formed by the functional block and the first and second mounting blocks. The snap-fit installation method not only ensures the sealing of the filter screen with the flow channel during the filtration process and prevents leakage of molten PVC material, but also provides a basic structure for the subsequent disassembly of the filter screen, making the assembly and separation of the filter screen and the functional block more operable. At the same time, the design of the functional block penetrating through the opposing surfaces of the two mounting blocks allows the filter screen to be completely embedded in the material flow channel, achieving comprehensive filtration of molten PVC.
[0007] Preferably, one end of the contact wheel is provided with a cross-section, and the contact wheel is positioned directly opposite the filter screen on the surface of the functional block, and the cross-section of the contact wheel is flush with the outer surface of the functional block.
[0008] By adopting the above technical solution, the cross-sectional design of the contact wheel can avoid unnecessary interference with the filter or functional block when it is not in operation, ensuring that the filter is always in a stable filtration position. The setting of the contact wheel facing the filter and having its cross-section flush with the surface of the functional block allows the non-cross-section end of the contact wheel to accurately act on the surface of the filter when the filter needs to be removed, and the force is evenly distributed, avoiding damage to the filter due to force deviation or excessive local force, thus ensuring the filter can be removed quickly and without damage.
[0009] Preferably, the end of the guide tube facing the contact wheel is in contact with the outer surface of the contact wheel, and the guide tube and the rotation axis of the contact wheel are concentrically arranged.
[0010] By adopting the above technical solution, the concentric arrangement of the guide tube and the contact wheel can ensure that when the impeller rotates with the contact wheel, a coaxial airflow trajectory is formed inside the guide tube, avoiding airflow turbulence caused by eccentricity and ensuring the stability of airflow transmission. The close fit design at the ends of the two can minimize airflow leakage from the gap, so that the suction effect generated by the impeller rotation can be effectively applied to the air inlet, ensuring that external cold air can be fully drawn into the guide tube, providing a sufficient and stable air source for the subsequent formation of high-pressure airflow and filter cooling.
[0011] Preferably, one end of the guide tube connected to the guide cylinder extends through the inner surface of the guide cylinder, and the lower end of the nozzle faces the filter screen on the surface of the functional block.
[0012] The above technical solution, with the design of the guide tube penetrating the inside of the guide cylinder, can directly receive the high-pressure airflow after the impeller acceleration, reducing the pressure loss of the airflow at the connection between the guide cylinder and the guide tube, ensuring that the airflow is delivered to the nozzle at a higher pressure. The nozzle's orientation towards the filter screen allows the high-pressure airflow to accurately and directly hit the filter screen surface, quickly removing the heat remaining on the filter screen surface due to contact with high-temperature molten material, significantly shortening the filter screen cooling time. This not only improves the screen replacement efficiency but also reduces the risk of burns to operators when contacting high-temperature filter screens, while also preventing incompletely cooled filter screens from affecting subsequent assembly operations.
[0013] Compared with the prior art, the beneficial effects of this utility model are: the automatic screen changing device for the PVC extruder: 1. When the contact wheel drives the impeller to rotate at high speed, the concentric fit design of the guide tube and the impeller creates a suction effect. External cold air is drawn into the guide tube from the air inlet. The spiral blades of the impeller accelerate the airflow and then deliver it to the nozzle through the guide tube. Finally, the high-pressure airflow directly hits the filter screen surface to reduce the surface temperature of the filter screen. This method is more efficient than the traditional natural cooling method, significantly shortens the screen replacement cycle, and eliminates the risk of burns. 2. By having the cross-section of the contact wheel flush with the surface of the filter screen, its rotation directly pushes the filter screen that is engaged and installed on the through-hole functional block through the non-cross-section end, thus achieving non-destructive and rapid replacement of the filter screen. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a three-dimensional structural diagram of the mounting plate, mounting bracket, and motor connection of this utility model; Figure 3 This is a three-dimensional structural diagram showing the connection between the second mounting block, functional block, and guide block of this utility model; Figure 4 This is a schematic diagram of the overall cross-sectional three-dimensional structure of this utility model; Figure 5This is a three-dimensional structural diagram of the cross-sectional view connecting the guide tube, air inlet and impeller of this utility model. Figure 6 This is a three-dimensional structural diagram of the connection between the motor, contact wheel, and impeller of this utility model.
[0015] In the diagram: 1. First mounting block; 2. Second mounting block; 3. Mounting rod; 4. Mounting plate; 5. Electric push rod; 6. Functional block; 7. Guide block; 8. Mounting frame; 9. Motor; 10. Contact wheel; 11. Flow guide tube; 12. Air inlet; 13. Impeller; 14. Flow guide pipe; 15. Nozzle. Detailed Implementation
[0016] 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.
[0017] Please see Figures 1-6 This utility model provides a technical solution: an automatic screen changing device for a PVC extruder.
[0018] Example 1: This example discloses: a first mounting block 1, a second mounting block 2 fixedly mounted on one side of the first mounting block 1 by bolts, a mounting rod 3 fixedly mounted on the outer surface of the first mounting block 1 and the second mounting block 2, and a mounting plate 4 fixedly mounted on one end of the mounting rod 3, an electric push rod 5 fixedly mounted on the outer surface of one side of the mounting plate 4, and a functional block 6 fixedly connected to the inner and outer surfaces of the end of the electric push rod 5 facing the first mounting block 1 and the second mounting block 2, and guide blocks 7 fixedly mounted on the outer surfaces of both ends of the second mounting block 2; A filter screen is fitted onto the outer surface of the functional block 6, and the functional block 6 penetrates the outer surface of the opposite end of the first mounting block 1 and the second mounting block 2. First, the first mounting block 1 and the second mounting block 2 are fixedly connected by bolts. Together, they form the core support frame of the device, providing an installation benchmark for all subsequent parts and forming the foundation for the flow channel of molten PVC material. Mounting rods 3 are fixedly installed on the outer surfaces of the first mounting block 1 and the second mounting block 2. One end of the mounting rod 3 is fixedly connected to the mounting plate 4. The mounting rod 3 acts as a "connecting bridge", stably supporting the mounting plate 4 away from the main body of the mounting block, avoiding direct contact between the mounting plate 4 and the high-temperature material flow channel. The mounting plate 4 serves as the mounting carrier for the electric push rod 5, providing it with a stable support platform. An electric push rod 5 is fixedly installed on the outer surface of the mounting plate 4 on one side. The end of the electric push rod 5 facing the first mounting block 1 and the second mounting block 2 is fixedly connected to the functional block 6. A filter screen is installed on the outer surface of the functional block 6, and the functional block 6 passes through the outer surface of the opposite end of the first mounting block 1 and the second mounting block 2. When it is necessary to send the filter screen into the material flow channel, the electric push rod 5 is energized and extends, pushing the functional block 6 to move along the preset path until the filter screen on the functional block 6 completely enters the flow channel formed by the first mounting block 1 and the second mounting block 2, so as to realize the filtering function of the filter screen on the molten PVC. Guide blocks 7 are fixedly installed on the outer surfaces of both ends of the second mounting block 2. When the electric push rod 5 drives the functional block 6 to move, the inclined surface at one end of the guide block 7 can squeeze the end of the filter screen protruding from the functional block 6 to ensure that the position of the filter screen is correct and that the filter screen is always in a precise filtration position.
[0019] Example 2: This example discloses, based on Example 1, that: a mounting bracket 8 is fixedly provided on the outer surface of the mounting plate 4 facing the first mounting block 1 and the second mounting block 2, and a motor 9 is fixedly installed on the outer surface of the mounting bracket 8, and a contact wheel 10 is fixedly connected to one end of the output shaft of the motor 9; One end of the contact wheel 10 is set with a cross-section, and the contact wheel 10 is set directly opposite the filter screen on the surface of the functional block 6, and the cross-section of the contact wheel 10 is flush with the outer surface of the functional block 6. Mounting plate 4 is mounted on the outer surface of the first mounting block 1 and the second mounting block 2. Mounting bracket 8 is fixedly installed on this outer surface. Mounting bracket 8 provides a dedicated mounting position for motor 9. Its structural design ensures that the output shaft of motor 9 can be accurately aligned with the filter screen on functional block 6 after installation, avoiding subsequent transmission deviation. Motor 9 is fixedly installed on the outer surface of mounting bracket 8. One end of the output shaft of motor 9 is fixedly connected to contact wheel 10. When the filter screen needs to be removed, motor 9 is powered on and started. The output shaft drives contact wheel 10 to rotate around its own axis. One end of contact wheel 10 is set with a cross-section. Contact wheel 10 is set directly opposite the filter screen on the surface of functional block 6. At the same time, the cross-section of contact wheel 10 is flush with the outer surface of functional block 6. This design ensures that when contact wheel 10 is not rotating, its cross-section end will not interfere with functional block 6 or filter screen. Only the rotating non-cross-section end can contact the filter screen surface. When the contact wheel 10 rotates to the point where the non-section end contacts the filter screen surface, the non-section end will generate a pushing force on the filter screen. Since the functional block 6 and the filter screen are only connected by a snap-fit, this pushing force can overcome the adhesion force between the filter screen and the functional block 6 caused by the cooling of the molten material, and push the filter screen out of the snap-fit structure of the functional block 6, so as to realize the quick and non-destructive removal of the filter screen and solve the problem of filter screens being difficult to disassemble due to adhesion in traditional devices. Example 3: This example is based on Example 1 and Example 2: A guide tube 11 is fixedly provided on the outer surface of the mounting rod 3, and an air inlet 12 is provided on the lower surface of the end of the guide tube 11 facing the contact wheel 10. An impeller 13 is fixedly provided on the outer surface of the side of the contact wheel 10 facing the guide tube 11. One end of the guide pipe 14 is fixedly connected to the upper surface of one end of the guide tube 11, and a nozzle 15 is fixedly connected to the other end of the guide pipe 14. The end of the guide tube 11 facing the contact wheel 10 is in contact with the outer surface of the contact wheel 10, and the guide tube 11 and the rotating shaft of the contact wheel 10 are concentrically arranged. One end of the guide tube 14 is connected to the guide cylinder 11 and passes through the inner side of the guide cylinder 11. The lower end of the nozzle 15 faces the filter screen on the surface of the functional block 6. A guide tube 11 is fixedly installed on the outer surface of the mounting rod 3. The end of the guide tube 11 facing the contact wheel 10 is tightly fitted with the outer surface of the contact wheel 10, and the guide tube 11 and the shaft of the contact wheel 10 are concentrically set. This concentric fit design ensures that a stable airflow channel can be formed in the guide tube 11 when the impeller 13 rotates, avoiding airflow leakage that would reduce the cooling efficiency. At the same time, an air inlet 12 is opened on the lower surface of the end of the guide tube 11 facing the contact wheel 10 as a channel for the intake of external cold air. An impeller 13 is fixedly installed on the outer surface of the contact wheel 10 facing the guide tube 11. When the motor 9 drives the contact wheel 10 to rotate, the contact wheel 10 synchronously drives the impeller 13 to rotate at high speed around the same axis. When the spiral blades of the impeller 13 rotate, they generate a suction effect, which draws ambient air from the air inlet 12 into the guide tube 11. At the same time, the air is accelerated and pressurized to form an airflow with a certain velocity and pressure. One end of the guide tube 14 is fixedly connected to the upper surface of one end of the guide tube 11, and the end of the guide tube 14 connected to the guide tube 11 passes through the inner surface of the guide tube 11. The accelerated airflow inside the guide tube 11 flows along the tube wall to the inlet of the guide tube 14, and is guided by the guide tube 14 to the nozzle 15 connected to the other end. The lower end of the nozzle 15 faces the filter screen on the surface of the functional block 6. After the high-pressure airflow is ejected from the nozzle 15, it directly acts on the surface of the filter screen that has just been taken out of the high-temperature flow channel, quickly removes the heat from the surface of the filter screen, and achieves a rapid reduction in the temperature of the filter screen. This shortens the screen replacement cycle and eliminates the risk of burns to operators from the high-temperature filter screen.
[0020] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. An automatic screen changing device for a PVC extruder, comprising a first mounting block (1), wherein a second mounting block (2) is fixedly mounted on one side of the first mounting block (1) by bolts, characterized in that: Mounting rods (3) are fixedly installed on the outer surfaces of the first mounting block (1) and the second mounting block (2), and mounting plate (4) is fixedly installed on one end of the mounting rod (3). An electric push rod (5) is fixedly installed on the outer surface of the mounting plate (4) on one side, and a functional block (6) is fixedly connected to the inner and outer surfaces of the end of the electric push rod (5) facing the first mounting block (1) and the second mounting block (2). Guide blocks (7) are fixedly installed on the outer surfaces of both ends of the second mounting block (2).
2. The automatic screen changing device for a PVC extruder according to claim 1, characterized in that: The mounting plate (4) has a mounting bracket (8) fixedly installed on the outer surface of the side facing the first mounting block (1) and the second mounting block (2), and a motor (9) is fixedly installed on the outer surface of the mounting bracket (8), and a contact wheel (10) is fixedly connected to one end of the output shaft of the motor (9).
3. The automatic screen changing device for a PVC extruder according to claim 1, characterized in that: A guide tube (11) is fixedly installed on the outer surface of the mounting rod (3), and an air inlet (12) is opened on the lower surface of the end of the guide tube (11) facing the contact wheel (10). An impeller (13) is fixedly installed on the outer surface of the side of the contact wheel (10) facing the guide tube (11). One end of the guide pipe (14) is fixedly connected to the upper surface of one end of the guide tube (11), and a nozzle (15) is fixedly connected to the other end of the guide pipe (14).
4. The automatic screen changing device for a PVC extruder according to claim 1, characterized in that: The outer surface of the functional block (6) is fitted with a filter screen, and the functional block (6) penetrates the outer surface of the first mounting block (1) and the second mounting block (2) facing each other.
5. The automatic screen changing device for a PVC extruder according to claim 2, characterized in that: One end of the contact wheel (10) is set with a cross section, and the contact wheel (10) is set directly opposite the filter screen on the surface of the functional block (6), and the cross section of the contact wheel (10) is flush with the outer surface of the functional block (6).
6. The automatic screen changing device for a PVC extruder according to claim 3, characterized in that: The end of the guide tube (11) facing the contact wheel (10) is in contact with the outer surface of the contact wheel (10), and the guide tube (11) and the contact wheel (10) are concentrically arranged.
7. The automatic screen changing device for a PVC extruder according to claim 3, characterized in that: One end of the guide tube (14) connected to the guide cylinder (11) penetrates the inner side of the guide cylinder (11), and the lower end of the nozzle (15) faces the filter screen on the surface of the functional block (6).