Twin-screw extruder for producing plastic products

Abstract

The utility model belongs to the field of double-screw extruders, and particularly relates to a double-screw extruder for producing plastic products, which comprises a double-screw extruder body, a feed port is arranged on the top surface of the double-screw extruder body, a conical blanking groove is fixedly connected to the top surface of the feed port, and a screw rod is arranged in the conical blanking groove. The device is characterized in that a screening assembly is fixedly connected to the interior of the conical discharging groove, the screening assembly comprises sleeves which are fixedly connected to the inner side wall of the conical discharging groove in an axial symmetry mode, springs are connected to the interiors of the sleeves in a sleeved mode, and a vibration motor is fixedly connected to one end of each spring; a vibration motor in the screening assembly drives a spring to drive a frame to vibrate at high frequency, so that a screen dynamically screens raw materials in a conical discharging groove, particle impurities which are not completely crushed are effectively separated and prevented from entering a double-screw extruder body to cause blockage, meanwhile, the vibration transmission stability is ensured through an axial symmetry mounting structure of a sleeve, and the service life of the double-screw extruder is prolonged. The raw material pretreatment efficiency and the equipment operation continuity are obviously improved.

Description

Technical Field

[0001] This utility model relates to the field of twin-screw extruders, specifically a twin-screw extruder for producing plastic products. Background Technology

[0002] Twin-screw extruders were developed based on single-screw extruders. Due to their excellent feeding performance, mixing and plasticizing performance, venting performance, and extrusion stability, they have been widely used in the molding and processing of extruded products. Because they are easy to open, the wear of threaded components and barrel bushings can be detected at any time, so as to carry out effective maintenance or replacement, instead of discovering problems only when extruded products occur, thus avoiding unnecessary waste.

[0003] In the prior art, such as in CN214188375U, a twin-screw extruder for producing plastic products is disclosed. It includes an extruder body, with cylinders installed at both ends on one side of the extruder body. The output end of the cylinder extends through the extruder body and into the interior, where a push plate is connected. By providing an opening and a door plate, it is convenient to clear the feed hopper without stopping the machine when there is material blockage, making it easy to use. By providing related structures such as springs, screen plates, and vibrators, it is convenient to screen impurities mixed in the raw materials, thereby improving the yield of the later products. By providing related structures such as push plates, cylinders, and brushes, it is convenient to clean the residual material on the inner wall of the extruder body, making it easy to use.

[0004] Although the aforementioned patent incorporates a motor, crushing blades, and other related structures, enabling the crushing of agglomerated raw materials before feeding and significantly reducing material blockage in the feeding hopper, it cannot pre-filter the raw materials to prevent clogging. Incompletely crushed materials will still remain during the later crushing process. Furthermore, replacing the screen is cumbersome, making it difficult to quickly change to screens of different mesh sizes according to actual needs. Therefore, to address these issues, a twin-screw extruder for plastic product manufacturing is proposed. Utility Model Content

[0005] To address the shortcomings of existing technologies, such as the inability to filter raw materials in advance to prevent clogging, resulting in incompletely crushed materials during subsequent crushing, and the cumbersome process of replacing screens with different mesh sizes to meet specific needs, this invention proposes a twin-screw extruder for plastic product manufacturing.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: A twin-screw extruder for producing plastic products according to this utility model includes a twin-screw extruder body, a feed port is opened on the top surface of the twin-screw extruder body, and a conical feeding trough is fixedly connected to the top surface of the feed port. The characteristic is that a screening component is fixedly connected inside the conical feeding trough, and a connecting component is fixedly connected to the surface of the screening component.

[0007] The screening component includes a sleeve that is fixedly connected to the inner wall of the conical feeding trough in an axisymmetric manner. A spring is sleeved inside the sleeve. A vibration motor is fixedly connected to one end of the spring. A frame is fixedly connected to the side of the vibration motor. A screen is provided on the surface of the frame.

[0008] The connecting assembly includes a square tube fixedly connected to the bottom wall of the frame in an axisymmetric manner. An elastic clamping plate is fixedly connected to the inside of the square tube in an axisymmetric manner. A rotating groove is opened at the top of the elastic clamping plate. A roller is rotatably connected inside the rotating groove. A locking block is provided between the two elastic clamping plates. The locking block is fixedly connected to the side of the screen.

[0009] Preferably, the sleeve is fixedly connected to the inner wall of the conical feeding trough in an axisymmetric manner, one end of the spring is fixedly connected to the vibrating motor, the frame is fixedly connected to the side of the vibrating motor, and the screen is disposed on the surface of the frame.

[0010] Preferably, the square tube is fixedly connected to the bottom wall of the frame in an axisymmetric manner, the elastic clamp is fixedly connected to the inside of the square tube in an axisymmetric manner, the roller is rotatably connected to the inside of the rotating groove at the top of the elastic clamp, and the locking block is fixedly connected to the side of the screen.

[0011] Preferably, the side of the elastic clamp is provided with an arc surface, which is located on the side of the elastic clamp facing the locking block.

[0012] Preferably, the vibratory motor is movably mounted inside the sleeve by a spring, and the frame is fixedly connected to the side of the vibratory motor to drive the screen to vibrate.

[0013] Preferably, the card block is clamped between two elastic clamping plates, and the roller is disposed on the downward pressing path of the card block and contacts the side of the card block.

[0014] The advantages of this utility model are:

[0015] 1. This utility model uses a vibrating motor in the screening component to drive a spring to cause the frame to vibrate at high frequency, so that the screen can dynamically screen the raw materials in the conical feeding trough, effectively separating incompletely crushed particulate impurities and preventing them from entering the twin-screw extruder body and causing blockage. At the same time, the axisymmetric installation structure of the sleeve ensures the stability of vibration transmission, significantly improving the raw material pretreatment efficiency and the continuity of equipment operation.

[0016] 2. This utility model utilizes the coordinated action of the elastic clamping plate and roller in the connecting component. When replacing the screen, the locking block presses down along the rolling surface of the roller to open the elastic clamping plate. After the locking block is fully embedded in the square tube, the elastic clamping plate automatically resets and clamps, realizing tool-free disassembly and assembly of the screen and frame. The guide arc surface design of the elastic clamping plate reduces the resistance to disassembly and assembly, meeting the needs for rapid replacement of screens with different mesh sizes. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the screening component structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the connection component structure of this utility model;

[0021] Figure 4 This is a schematic diagram of the disassembled structure of this utility model.

[0022] In the diagram: 1. Twin-screw extruder body; 2. Conical feed trough; 3. Screening assembly; 31. Sleeve; 32. Spring; 33. Vibration motor; 34. Frame; 35. Screen; 4. Connecting assembly; 41. Square tube; 42. Elastic clamping plate; 43. Roller; 44. Locking block. Detailed Implementation

[0023] 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 scope of protection of the present utility model.

[0024] Please see Figures 1-4As shown, a twin-screw extruder for producing plastic products includes a twin-screw extruder body 1. A feed inlet is provided on the top surface of the twin-screw extruder body 1, and a conical feed trough 2 is fixedly connected to the top surface of the feed inlet. The characteristic feature is that a screening component 3 is fixedly connected inside the conical feed trough 2, and a connecting component 4 is fixedly connected to the surface of the screening component 3. The screening component 3 includes a sleeve 31 that is axially symmetrically fixed to the inner wall of the conical feed trough 2. A spring 32 is sleeved inside the sleeve 31. A vibration motor 33 is fixedly connected to one end of the spring 32. A frame 34 is fixedly connected to the side of the vibration motor 33, and a screen 35 is provided on the surface of the frame 34.

[0025] During operation, the sleeve 31 of the screening component 3 is welded to the inner wall of the conical feed trough 2 in an axisymmetric manner. One end of the spring 32 nested inside the sleeve 31 is fixed to the housing of the vibrating motor 33 by bolts, and the other end abuts against the inner wall of the sleeve 31 to form a buffer structure. When the vibrating motor 33 starts, the reciprocating vibration force generated by it is transmitted to the frame 34 through the spring 32. The frame 34 drives the screen 35 to vibrate at high frequency in the conical feed trough 2. The raw material forms a dynamic tumbling screening on the surface of the screen 35. Particles that do not meet the particle size are intercepted above the screen 35, while qualified materials pass through the screen 35 and enter the twin-screw extruder body 1. The axisymmetric layout of the sleeve 31 makes the vibration transmission path symmetrically distributed, effectively avoiding the frame 34 from swaying vibration.

[0026] Furthermore, the connecting component 4 includes a square tube 41 that is fixedly connected to the bottom wall of the frame 34 in an axisymmetric manner. An elastic clamping plate 42 is fixedly connected to the inside of the square tube 41 in an axisymmetric manner. A rotating groove is opened at the top of the elastic clamping plate 42. A roller 43 is rotatably connected inside the rotating groove. A locking block 44 is provided between the two elastic clamping plates 42. The locking block 44 is fixedly connected to the side of the screen 35.

[0027] During operation, the square tube 41 of the connecting component 4 is vertically fixed to both sides of the bottom of the frame 34 by welding. The elastic clamping plate 42 welded inside each square tube 41 is made of 65Mn spring steel. The roller 43 installed in the top rotating groove achieves circumferential rotation through the pin shaft. When changing the screen 35, the operator aligns the clamping blocks 44 on both sides of the screen 35 with the top of the square tube 41 and presses them down. After the wedge-shaped bottom surface of the clamping block 44 contacts the roller 43, the roller 43 rotates along the rotating groove and guides the clamping block 44 to open the elastic clamping plate 42 to both sides. When the clamping block 44 is fully inserted into the square tube 41, the elastic clamping plate 42 clamps the side wall of the clamping block 44 by its own rebound force. The arc surface on the inner side of the elastic clamping plate 42 forms a surface contact with the chamfer of the clamping block 44, which increases the clamping contact area and reduces the sliding friction during disassembly, so that the screen 35 can be disassembled and assembled within 10 seconds.

[0028] Furthermore, the side of the elastic clamp 42 is provided with an arc surface, which is located on the side of the elastic clamp 42 facing the locking block 44;

[0029] During operation, the side of the elastic clamping plate 42 is machined to form a guide arc surface with a curvature radius of 3-5mm. This arc surface extends towards the insertion direction of the clamping block 44. The elastic clamping plate 42 is made of 65Mn spring steel and is vertically fixed to both sides of the inner wall of the square tube 41 with bolts. When the clamping block 44 is pressed down, its bottom chamfer contacts the arc surface of the elastic clamping plate 42 to generate a sliding component force, which forces the elastic clamping plate 42 to elastically deform outward. After the clamping block 44 is fully embedded, the elastic clamping plate 42 clamps the side wall of the clamping block 44 by the material's rebound force, and the arc surface forms a surface contact with the clamping block 44. This structure reduces the resistance during disassembly and assembly by 42%, and at the same time disperses the local stress to the entire elastic clamping plate 42, avoiding clamping failure caused by stress concentration and extending the service life of the connecting component 4.

[0030] Furthermore, the vibrating motor 33 is movably mounted inside the sleeve 31 via the spring 32, and the frame 34 is fixedly connected to the side of the vibrating motor 33 to drive the screen 35 to vibrate.

[0031] During operation, the housing of the vibrating motor 33 and the inner wall of the sleeve 31 maintain a movable gap. The spring 32 is pre-compressed and installed inside the sleeve 31. One end of the spring 32 is welded to the bottom of the sleeve 31, and the other end is bolted to the housing of the vibrating motor 33 through a flange. When the vibrating motor 33 starts, the spring 32 generates an elastic deformation of ±3mm in the vibration direction, causing the frame 34 to drive the screen 35 to form a linear reciprocating vibration. This installation method concentrates the vibration energy to the screen 35. At the same time, the spring 32 buffers and absorbs 56% of the lateral impact force, avoiding vibration transmission to the conical feed trough 2 and causing structural fatigue. This ensures that the overall amplitude of the equipment is controlled within 0.1mm during screening operations, improving operational stability.

[0032] Working principle: When the raw material enters the twin-screw extruder body 1 through the conical feed chute 2, the vibration motor 33 of the screening component 3 is energized to generate high-frequency vibration. The vibration motor 33 achieves directional transmission of vibration energy through the elastic support of the spring 32 inside the sleeve 31, driving the frame 34 and screen 35 fixed to its side to vibrate synchronously. At this time, the raw material is dynamically tumbled and screened on the surface of the screen 35 due to vibration. Material with qualified particle size passes through the screen 35 and enters the interior of the extruder body 1, while oversized particles are intercepted on the surface of the screen 35. When it is necessary to replace the screen 35, the operator... The author aligns the locking blocks 44 on both sides of the new screen 35 with the square tube 41 at the bottom of the frame 34 and presses them down. After the guide slope of the locking block 44 contacts the roller 43 at the top of the elastic clamp 42, the roller 43 rotates to guide the locking block 44 to open the elastic clamp 42 and slide into the square tube 41. After the elastic clamp 42 rebounds, it clamps the locking block 44 through the arc surface to complete the locking. The spring 32 buffer structure between the vibrating motor 33 and the sleeve 31 concentrates the vibration energy in the area of ​​the screen 35, avoiding resonance effects on the conical feed chute 2, thereby achieving coordinated control of efficient screening and stable equipment operation.

[0033] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, or similar improvements made within the theoretical and principle content of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A twin-screw extruder for producing plastic products, characterized in that: The invention includes a twin-screw extruder body (1), the top surface of which is provided with a feed inlet, and the top surface of which is fixedly connected with a conical feed trough (2). The invention is characterized in that a screening component (3) is fixedly connected inside the conical feed trough (2), and a connecting component (4) is fixedly connected to the surface of the screening component (3). The screening component (3) includes a sleeve (31) fixedly connected to the inner wall of the conical feeding trough (2) in an axisymmetric manner. A spring (32) is sleeved inside the sleeve (31). A vibration motor (33) is fixedly connected to one end of the spring (32). A frame (34) is fixedly connected to the side of the vibration motor (33). A screen (35) is provided on the surface of the frame (34). The connecting component (4) includes a square tube (41) fixedly connected to the bottom wall of the frame (34) in an axisymmetric manner. An elastic clamp (42) is fixedly connected to the inside of the square tube (41) in an axisymmetric manner. A rotating groove is opened at the top of the elastic clamp (42). A roller (43) is rotatably connected inside the rotating groove. A locking block (44) is provided between the two elastic clamps (42). The locking block (44) is fixedly connected to the side of the screen (35).

2. The twin-screw extruder for producing plastic products according to claim 1, characterized in that: The sleeve (31) is fixedly connected to the inner wall of the conical feeding trough (2) in an axisymmetric manner. One end of the spring (32) is fixedly connected to the vibrating motor (33). The frame (34) is fixedly connected to the side of the vibrating motor (33). The screen (35) is set on the surface of the frame (34).

3. The twin-screw extruder for producing plastic products according to claim 1, characterized in that: The square tube (41) is fixedly connected to the bottom wall of the frame (34) in an axisymmetric manner. The elastic clamp (42) is fixedly connected to the inside of the square tube (41) in an axisymmetric manner. The roller (43) is rotatably connected to the inside of the rotating groove at the top of the elastic clamp (42). The locking block (44) is fixedly connected to the side of the screen (35).

4. The twin-screw extruder for producing plastic products according to claim 1, characterized in that: The side of the elastic clamp (42) is provided with an arc surface, which is located on the side of the elastic clamp (42) facing the locking block (44).

5. A twin-screw extruder for producing plastic products according to claim 1, characterized in that: The vibrating motor (33) is movably mounted inside the sleeve (31) via a spring (32), and the frame (34) is fixedly connected to the side of the vibrating motor (33) to drive the screen (35) to vibrate.

6. A twin-screw extruder for producing plastic products according to claim 1, characterized in that: The locking block (44) is clamped between two elastic clamping plates (42), and the roller (43) is disposed on the downward pressing path of the locking block (44) and contacts the side of the locking block (44).

Images