A clog-resistant twin-screw extruder for plastic processing

Abstract

This utility model relates to the field of plastic processing technology, and more particularly to a clog-resistant twin-screw extruder for plastic processing. It includes an extruder body, with a feeding hopper for plastic raw materials at the top of the extruder body. A feeding pipe is located below the feeding hopper, and the bottom of the feeding pipe connects to the screw discharge pipe. It also includes support plates and sliding rods. An annular support plate is fixedly connected to the bottom of the feeding hopper. At least three guide plates are fixedly connected circumferentially at intervals on the bottom surface of the support plate. Each guide plate of the support plate has an inwardly facing sliding rod slidably mounted on it. This utility model effectively promotes the flow of raw materials within the feeding pipe by intermittently impacting the outer wall of the feeding pipe with the sliding rod and its end impact head. This reduces clogging caused by localized material accumulation. Combined with a rubber sheet buffering the impact force generated by the direct impact of the impact head on the feeding pipe, it reduces noise during operation and minimizes damage to the equipment.

Description

Technical Field

[0001] This utility model relates to the field of plastic processing technology, and in particular to a twin-screw extruder for anti-clogging plastic processing. Background Technology

[0002] In the plastics processing industry, twin-screw extruders are a widely used and crucial piece of equipment, primarily used for the mixing, plasticizing, and molding of materials such as plastics and rubber. They utilize two meshing screws rotating within a heated barrel to convey, compress, melt, and uniformly mix materials, ultimately extruding them through a die. Due to their efficient mixing capabilities and excellent self-cleaning properties, twin-screw extruders play an irreplaceable role in the production of high-performance composite materials, modified plastics, and recycled materials.

[0003] However, existing twin-screw extruders still have some technical shortcomings in practical use, especially when operating continuously for long periods or processing highly filled and viscous materials, they are prone to material blockage. This is mainly because material accumulation may occur during conveying and mixing due to improper temperature control, unreasonable screw structure, or poor material flowability, leading to increased pressure and obstructed flow. In addition, traditional twin-screw extruders are relatively cumbersome to clean and maintain; once blockage occurs, it often requires stopping the machine and disassembling the screw for cleaning, which seriously affects production efficiency. Therefore, we propose an anti-clogging twin-screw extruder for plastic processing to overcome the above-mentioned defects. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, the present invention provides a twin-screw extruder for plastic processing that is clogging-proof.

[0005] The technical solution of this utility model is as follows: a twin-screw extruder for plastic processing that prevents clogging, comprising an extruder body, the extruder body being the main assembly body of the extruder, a feeding hopper for plastic raw materials at the top of the extruder body, a feeding pipe at the bottom of the feeding hopper, and a screw discharge pipe at the bottom of the feeding pipe; it also includes a support plate, sliding rods, a contact plate, a bearing seat, a rotating frame, and an extrusion ring, wherein an annular support plate is fixedly connected to the bottom of the feeding hopper, and at least three guide plates are fixedly connected circumferentially at intervals on the bottom surface of the support plate, and each guide plate of the support plate is slidably mounted with an inwardly facing sliding rod, the sliding rods being divided into The sliding rod is arranged around the feed tube of the extruder body. A contact plate is fixedly connected to the middle of the rod body. A spring is sleeved on the sliding rod between the contact plate and the guide plate. An impact head is installed at the end of the sliding rod facing the feed tube. The impact head of the sliding rod impacts the wall of the feed tube. A bearing seat is fixedly installed on the extruder body. A rotating frame is rotatably connected to the bearing seat. An extrusion ring is fixedly connected to the top of the rotating frame. The extrusion ring is circumferentially fixed with outwardly protruding arc-shaped blocks. The number of arc-shaped blocks of the extrusion ring is the same as the number of contact plates of the sliding rod. A drive component is provided on the extruder body to drive the rotating frame to rotate.

[0006] As a preferred technical solution of this utility model, the driving component includes a motor, a gear, and a gear ring. The motor is fixedly installed on the upper part of the housing near the screw discharge pipe of the extruder body. The gear is fixedly connected to the output shaft of the motor. A gear ring is fixedly installed on the outer circumferential side of the rotating frame. The gear and the gear ring mesh with each other. The motor drives the gear ring through gear meshing. The rotating gear ring can synchronously drive the rotating frame and the extrusion ring to rotate. The extrusion ring can intermittently press the contact plate on the sliding rod.

[0007] As a preferred embodiment of this utility model, the outer wall of the feed tube is fitted with a rubber sheet, the number of rubber sheets being the same as the sliding rod, and the impact head of the sliding rod contacting the rubber sheet. The rubber sheet is used to buffer the impact force of the impact head of the sliding rod directly hitting the feed tube.

[0008] As a preferred embodiment of this utility model, a pressure measuring tube is connected to one side of the screw discharge pipe of the extruder body, and a pressure sensor is installed on the pressure measuring tube. The pressure sensor is used to detect the pressure of the plastic material flowing in the pressure tube.

[0009] As a preferred technical solution of this utility model, the connection of the pressure measuring tube is provided with a mating thread. The pressure measuring tube is mated to one side of the screw discharge tube by means of a connecting ring and screw tightening. By rotating the connecting ring to loosen it, the connecting ring can be installed and removed from the screw discharge tube.

[0010] As a preferred technical solution of this utility model, it also includes an alarm. The extruder body is also equipped with an alarm. The pressure sensor has a built-in controller to trigger the alarm. When the pressure sensor detects an abnormal pressure of the plastic material in the pressure measuring tube, the pressure sensor can trigger the alarm through the built-in controller.

[0011] Beneficial effects:

[0012] 1. This utility model uses a sliding rod and its end impact head to intermittently impact the outer wall of the feeding pipe, which effectively promotes the flow of raw materials in the feeding pipe and reduces the blockage caused by local material accumulation. Combined with the impact force generated by the rubber sheet buffer impact head directly impacting the feeding pipe, it reduces noise during operation and reduces damage to the equipment.

[0013] 2. This utility model can monitor the material pressure in the screw discharge pipe in real time by setting up a pressure sensor and an alarm. Once an abnormal high pressure is detected, the alarm will be triggered to remind the user to check the problem in time, thereby avoiding potential equipment damage and production interruption.

[0014] 3. The pressure testing tube of this utility model, through the design of the mating thread and connecting ring, makes its installation and disassembly simple and quick, facilitates regular inspection and maintenance, and improves the maintainability and service life of the equipment. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0016] Figure 2 This diagram shows the connection relationship between the screw discharge pipe, pressure measuring pipe, and alarm of this utility model.

[0017] Figure 3 This is a schematic diagram of the components of this utility model, including the support plate, sliding rod, motor, gear, and gear ring.

[0018] Figure 4 This is a schematic diagram showing the fit between the support plate, sliding rod, contact plate, and compression ring of this utility model.

[0019] Figure 5 This is a schematic diagram of the screw discharge pipe, pressure measuring pipe, pressure sensor and alarm of this utility model.

[0020] Among them: 1-extruder body, 101-screw discharge pipe, 2-feeding bin, 3-feeding pipe, 4-support plate, 41-guide plate, 5-sliding rod, 51-contact plate, 52-impact head, 6-spring, 7-bearing seat, 8-rotating frame, 9-extrusion ring, 10-motor, 11-gear, 12-gear ring, 13-rubber sheet, 14-pressure measuring tube, 15-connecting ring, 16-pressure sensor, 17-alarm. Detailed Implementation

[0021] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0022] A clog-resistant twin-screw extruder for plastic processing, such as... Figures 1-5 As shown, the extruder includes an extruder body 1, which is the main assembly of the extruder. The top of the extruder body 1 is a feeding hopper 2 for plastic raw materials, and the lower part of the feeding hopper 2 is a feeding pipe 3. The bottom of the feeding pipe 3 is connected to the screw discharge pipe 101. It also includes a support plate 4, sliding rods 5, contact plates 51, bearing seats 7, a rotating frame 8, and an extrusion ring 9. An annular support plate 4 is fixedly connected to the bottom of the feeding hopper 2. Three guide plates 41 are fixedly connected circumferentially to the bottom surface of the support plate 4. Each guide plate 41 of the support plate 4 has an inwardly facing sliding rod 5 slidably mounted on it. The sliding rods 5 are distributed around the feeding pipe 3 of the extruder body 1. A contact plate 51 is fixedly connected to the middle of the sliding rod 5. A spring 6 is sleeved on the sliding rod 5 between the contact plate 51 and the guide plate 41. An impact head 52 is mounted on the end of the sliding rod 5 facing the feeding pipe 3. The impact head 52 of the sliding rod 5 impacts the wall of the feeding pipe 3, accelerating the flow of the raw material inside the feeding pipe 3. To reduce the risk of blockage due to obstructed flow of plastic raw materials, a bearing seat 7 is fixedly installed on the extruder body 1. A rotating frame 8 is rotatably connected to the bearing seat 7. An extrusion ring 9 is fixedly connected to the top of the rotating frame 8. The extrusion ring 9 has circumferentially spaced protruding arc-shaped blocks. The number of arc-shaped blocks on the extrusion ring 9 and the number of contact plates 51 on the sliding rod 5 are the same. The extruder body 1 is equipped with a drive unit that drives the rotating frame 8 to rotate. After the drive unit drives the rotating frame 8 to rotate, the rotating frame 8 synchronously drives the extrusion ring 9 to rotate, so that the circumferentially protruding arc-shaped blocks of the extrusion ring 9 can intermittently squeeze the contact plates 51. The contact plates 51 drive the sliding rod 5 and move against the elastic force of the spring 6 until the arc-shaped blocks of the extrusion ring 9 disengage from the contact plates 51. The sliding rod 5 and the contact plates 51 are reset under the action of the spring 6 and impact the outer wall of the feed pipe 3 through the impact head 52 at the end of the sliding rod 5. This allows the feed material in the feed pipe 3 to flow quickly and reduces the possibility of local accumulation and blockage of material on the inner wall of the feed pipe 3.

[0023] like Figure 3 and Figure 4As shown, the driving components include a motor 10, a gear 11, and a gear ring 12. The motor 10 is fixedly installed on the upper part of the housing of the extruder body 1 near the screw discharge pipe 101. The gear 11 is fixedly connected to the output shaft of the motor 10. A gear ring 12 is fixedly installed on the outer circumferential side of the rotating frame 8. The gear 11 and the gear ring 12 mesh with each other. The motor 10 drives the gear ring 12 through the meshing of the gear 11. The rotating gear ring 12 can synchronously drive the rotating frame 8 and the extrusion ring 9 to rotate. The extrusion ring 9 can intermittently press the contact plate 51 on the sliding rod 5. The sliding rod 5 is reset in cooperation with the spring 6, so that the impact head 52 of the sliding rod 5 can intermittently impact the pipe wall of the feed pipe 3.

[0024] like Figure 2 and Figure 3 As shown, the outer wall of the feed pipe 3 is fitted with rubber sheets 13. The number of rubber sheets 13 is the same as that of the sliding rod 5. The impact head 52 of the sliding rod 5 is in contact with the rubber sheets 13. The rubber sheets 13 are used to buffer the impact force of the impact head 52 of the sliding rod 5 directly hitting the feed pipe 3, and reduce the noise generated during impact vibration.

[0025] like Figure 2 and Figure 5 As shown, a pressure measuring tube 14 is connected to one side of the screw discharge pipe 101 of the extruder body 1. A pressure sensor 16 is installed on the pressure measuring tube 14. The pressure sensor 16 is used to detect the pressure of the plastic material flowing in the pressure tube 14, thereby helping the user to determine whether the plastic material in the screw discharge pipe 101 is blocked.

[0026] like Figure 5 As shown, the pressure testing tube 14 is provided with a mating thread at the connection point. The pressure testing tube 14 is mated to one side of the screw discharge tube 101 by the threaded connection ring 15. By rotating the connection ring 15 to loosen or loosen it, the connection ring 15 can be installed and removed from the screw discharge tube 101, which facilitates the maintenance of the connection ring 15.

[0027] like Figure 1 and Figure 5 As shown, it also includes an alarm 17. An alarm 17 is also installed on the extruder body 1. The pressure sensor 16 has a built-in controller to trigger the alarm. When the pressure sensor 16 detects an abnormal pressure of the plastic material in the pressure measuring tube 14, the pressure sensor 16 can trigger the alarm 17 through the built-in controller to sound an alarm, thereby reminding the user in real time to check for blockage in the screw discharge tube 101.

[0028] When using this twin-screw extruder, the plastic raw material is first fed into the feed hopper 2 at the top of the extruder body 1. The raw material enters the screw discharge pipe 101 through the feed pipe 3 for melt extrusion. To prevent the feed pipe 3 from being blocked, the motor 10 is activated. The gear 11 on the output shaft of the motor 10 meshes with the gear ring 12 on the outer side of the rotating frame 8, driving the rotating frame 8 and the top extrusion ring 9 to rotate. During the rotation, the arc-shaped blocks arranged circumferentially on the extrusion ring 9 will successively press against the contact plates 51 of each sliding rod 5, forcing the sliding rod 5 to move inward against the elastic force of the spring 6. When the arc-shaped blocks disengage from the contact plates 51, the spring 6 releases its elastic force instantly, pushing the sliding rod 5 to quickly return to its original position. The impact head 52 at the end of the sliding rod 5 impacts the rubber sheet 13 on the outer side of the feed pipe 3 at a high frequency, causing vibration. The transmission disrupts the bridging phenomenon of the raw material inside the pipe, improving material flowability. During this process, the rubber sheet 13 acts as a buffer medium, effectively transmitting vibration energy and reducing metal impact noise. Meanwhile, the pressure measuring tube 14 connected to the side of the screw discharge pipe 101 is tightly fixed by the threaded connecting ring 15. The pressure sensor 16 inside the pressure measuring tube 14 monitors the pressure change of the plastic material in real time. When an abnormal increase in pressure is detected, the built-in controller of the sensor will trigger the alarm 17 to emit an audible and visual signal, prompting the operator to check for blockage risks in time. The pressure measuring tube 14 adopts a detachable design, and maintenance or replacement can be quickly completed by rotating the connecting ring 15. The entire system achieves dynamic anti-blocking and abnormal early warning functions in the feeding process through the synergistic effect of mechanical vibration and intelligent monitoring.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A twin-screw extruder for plastic processing that is designed to prevent clogging, comprising an extruder body (1), wherein the top of the extruder body (1) is a feeding bin (2), the lower part of the feeding bin (2) is a feeding pipe (3), and the bottom of the feeding pipe (3) is connected to a screw discharge pipe (101); Its characteristics are, It also includes a support plate (4), a sliding rod (5), a contact plate (51), a bearing seat (7), a rotating frame (8), and an extrusion ring (9). The bottom of the feed hopper (2) is fixedly connected to the support plate (4). At least three guide plates (41) are fixedly connected to the bottom surface of the support plate (4) at circumferential intervals. Each guide plate (41) of the support plate (4) is slidably mounted with a sliding rod (5). The sliding rods (5) are distributed around the feed pipe (3) of the extruder body (1). A contact plate (51) is fixedly connected to the rod of the sliding rod (5). The contact plate (51) and the guide plate (41) The sliding rod (5) between the two is covered with a spring (6). The sliding rod (5) is equipped with an impact head (52) at the end facing the feed tube (3). A bearing seat (7) is fixedly installed on the extruder body (1). A rotating frame (8) is rotatably connected to the bearing seat (7). An extrusion ring (9) is fixedly connected to the top of the rotating frame (8). The extrusion ring (9) is circumferentially spaced with outwardly protruding arc-shaped blocks. The number of arc-shaped blocks of the extrusion ring (9) and the number of contact plates (51) of the sliding rod (5) are the same. A driving component for driving the rotating frame (8) to rotate is provided on the extruder body (1).

2. A clog-resistant twin-screw extruder for plastic processing according to claim 1, characterized in that, The driving components include a motor (10), a gear (11), and a gear ring (12). The motor (10) is fixedly installed on the upper part of the housing of the extruder body (1) near the screw discharge pipe (101). The gear (11) is fixedly connected to the output shaft of the motor (10). A gear ring (12) is fixedly installed on the outer circumferential side of the rotating frame (8). The gear (11) and the gear ring (12) mesh with each other.

3. A clog-resistant twin-screw extruder for plastic processing according to claim 2, characterized in that, The outer wall of the feed pipe (3) is fitted with rubber sheets (13), the number of rubber sheets (13) is the same as that of the sliding rod (5), and the impact head (52) of the sliding rod (5) is in contact with the rubber sheets (13).

4. A clog-resistant twin-screw extruder for plastic processing according to claim 3, characterized in that, A pressure measuring tube (14) is connected to one side of the screw discharge pipe (101) of the extruder body (1), and a pressure sensor (16) is installed on the pressure measuring tube (14).

5. A clog-resistant twin-screw extruder for plastic processing according to claim 4, characterized in that, The pressure measuring tube (14) is provided with a mating thread at the connection point. The pressure measuring tube (14) is mated to the side of the screw discharge tube (101) by means of a connecting ring (15) and threaded tightening.

6. A clog-resistant twin-screw extruder for plastic processing according to claim 5, characterized in that, It also includes an alarm (17), which is installed on the extruder body (1), and the pressure sensor (16) has a built-in controller for triggering the alarm.

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