Screening device for plastic particle processing

Abstract

The utility model relates to the technical field of plastic particle processing, in particular to a screening device for plastic particle processing, which simplifies the collection and recovery of unqualified particles and improves the practicability of equipment. The top of the screening box is provided with a feeding hopper; the conveying rollers are rotationally mounted in the screening box and are arranged in an inverted trapezoidal shape; the conveying belt is arranged on the outer sides of the conveying rollers in a tensioning sleeve mode, and a plurality of screen holes are evenly formed in the conveying belt; the discharging plate is obliquely mounted in the trapezoidal space formed by the conveying belt, one end of the discharging plate is fixedly connected with the inner wall of the screening box, and the other end of the discharging plate penetrates through the screening box and extends to the outer side; the collecting box is movably mounted in the screening box and is used for collecting the raw materials screened on the conveying belt; the driving motor is installed on the outer side of the screening box and used for driving the conveying rollers to rotate.

Description

Technical Field

[0001] This utility model relates to the technical field of plastic particle processing, and in particular to a screening device for plastic particle processing. Background Technology

[0002] Plastic particles are a raw material used to manufacture various plastic products, typically small spheres or granules a few millimeters in diameter. They are made from different polymer materials, such as polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), and polystyrene (PS). These particles can be heated and melted, and then molded into various shapes and applications of plastic products through molding processes such as injection molding, blow molding, and extrusion. To avoid larger particles affecting the molding effect, the plastic particles are usually screened through a sieve during the feeding process. However, over time, because the sieve is mostly installed internally, it is inconvenient to collect and recycle the unqualified raw materials screened above, thus reducing its practicality. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides a screening device for plastic particle processing that simplifies the collection and recycling of substandard particles and improves the practicality of the equipment.

[0004] This utility model discloses a screening device for processing plastic particles, comprising: a screening box with a feed hopper mounted on its top; several conveyor rollers rotatably mounted inside the screening box and arranged in an inverted trapezoidal shape; a conveyor belt tensioned and sleeved on the outside of the conveyor rollers, with several screen holes evenly distributed on the conveyor belt; a discharge plate installed in the trapezoidal space formed by the conveyor belt and arranged at an incline, one end of which is fixedly connected to the inner wall of the screening box, and the other end extending through the screening box to the outside; a collection box movably mounted inside the screening box to collect the raw materials screened on the conveyor belt; and a drive motor mounted on the outside of the screening box to drive the conveyor rollers to rotate.

[0005] Furthermore, the feed hopper includes a cone-shaped body with a surrounding plate at its bottom end. The bottom end of the surrounding plate is close to but does not contact the outer surface of the conveyor belt. The surrounding plate has an opening for the screened raw material to pass through. A baffle plate is rotatably connected to the opening. The rotating shaft of the baffle plate is connected to the conveyor roller through a transmission mechanism.

[0006] Furthermore, the transmission mechanism includes a first transmission gear, a second transmission gear, and a reducer. The first transmission gear is located at one end of a transmission roller, the second transmission gear meshes with the first transmission gear, the input end of the reducer is connected to the second transmission gear, and the output end of the reducer is connected to one end of a rotating shaft.

[0007] Furthermore, a protective cover is provided on the outer side of the transmission mechanism.

[0008] Furthermore, each conveyor roller is equipped with a limiting plate at both ends to limit the movement of the conveyor belt.

[0009] Furthermore, each conveyor roller is covered with an anti-slip layer on its outer side.

[0010] Furthermore, the upper end face of the collection box is open, and its side wall is constructed with an inclined portion that is close to but does not contact the outer surface of the conveyor belt.

[0011] Furthermore, a brush plate is installed inside the screening box, and the brush plate is provided with bristles that fit against the inner surface of the conveyor belt.

[0012] Furthermore, it also includes a tensioning mechanism for tensioning the conveyor belt. The tensioning mechanism includes a tensioning roller parallel to the conveyor roller. Both ends of the tensioning roller are rotatably connected to sliders. Mounting plates are symmetrically installed on both sides of the screening box. The mounting plates are provided with a first chute for the slider to move in the direction of approaching or moving away from the conveyor belt. A first screw is screwed onto the slider. One end of the first screw is rotatably connected to the inner wall of the first chute, and the other end passes through the mounting plate and is provided with a first handle at its end.

[0013] Furthermore, the mounting plate has a second slide groove that communicates with the first slide groove. A locking block that moves in a direction close to or away from the first screw is slidably connected in the second slide groove. A second screw rotates on the locking block and is screwed to the mounting plate. A second handle is provided at the end of the second screw away from the locking block.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] 1. By screening plastic particles through the screen holes on the conveyor belt, particles of different sizes can be effectively separated; particles of the correct size fall through the screen holes on the conveyor belt and are finally discharged through the discharge plate, while larger particles are retained on the conveyor belt, ensuring the efficiency and accuracy of the screening process.

[0016] 2. The drive motor drives the conveyor roller to rotate, which automates the process of collecting non-conforming materials. When the conveyor belt is running, the plastic particles that remain on the conveyor belt are transported and fall into the collection box at the end of the conveyor, ensuring that non-conforming materials can be separated in time without affecting the subsequent screening process. It also facilitates centralized processing or recycling of these materials. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings.

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

[0019] Figure 2 This is a cross-sectional structural schematic diagram of the present invention;

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

[0021] Figure 4 This is a schematic diagram of the tensioning mechanism of this utility model;

[0022] The attached diagram shows the following components: 1. Screening box; 2. Feed hopper; 21. Baffle plate; 211. Rotating shaft; 3. Conveyor roller; 31. Limiting plate; 4. Conveyor belt; 41. Screen hole; 5. Discharge plate; 6. Collection box; 61. Inclined part; 7. Drive motor; 8. Transmission mechanism; 81. Transmission gear one; 82. Transmission gear two; 83. Reducer; 9. Protective cover; 10. Brush plate; 101. Brush bristles; 11. Tensioning mechanism; 111. Tensioning roller; 112. Slider; 113. Mounting plate; 114. First chute; 115. First screw; 116. First handle; 117. Second chute; 118. Locking block; 119. Second screw; 120. Second handle. Detailed Implementation

[0023] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0024] like Figures 1 to 4 As shown, the screening device for processing plastic particles of this utility model includes: a screening box 1, on which a feed hopper 2 is installed; several conveyor rollers 3, all rotatably installed inside the screening box 1, arranged in an inverted trapezoidal shape; a conveyor belt 4, tensioned and sleeved on the outside of the several conveyor rollers 3, with several screen holes 41 evenly opened on the conveyor belt 4; a discharge plate 5, installed in the trapezoidal space formed by the conveyor belt 4, and arranged at an incline, one end of which is fixedly connected to the inner wall of the screening box 1, and the other end extends through the screening box 1 to the outside; a collection box 6, movably installed inside the screening box 1, for collecting the raw materials screened on the conveyor belt 4; and a drive motor 7, installed on the outside of the screening box 1, for driving the conveyor rollers 3 to rotate.

[0025] The screening box 1 serves as the main structure of the entire screening device, providing a relatively enclosed working environment for the internal components and preventing dust and other impurities from entering or escaping. During operation, plastic particles to be screened are added to the screening device through the feed hopper 2. The conveyor roller 3 supports and drives the conveyor belt 4. Several screen holes 41 on the conveyor belt 4 allow small plastic particles of the correct size to pass through, while larger particles are retained on the conveyor belt 4. After screening, plastic particles that meet the size requirements fall onto the discharge plate 5 and slide out of the screening box 1 along its inclined surface; particles that fail to pass through the screen holes are retained on the conveyor belt. As the conveyor belt 4 moves, the material is carried to the conveyor and falls into the collection box 6. The movable design of the collection box 6 makes it easy to remove and empty, facilitating the recycling of these materials. The inverted trapezoidal arrangement of the conveyor rollers 3 makes the space between the conveyor belts 4 gradually narrow from top to bottom, providing space for the collection box 6. This allows the collection box 6 to be placed more stably below the end of the conveyor belt 4, ensuring that all unqualified materials that do not pass through the screen holes 41 can be effectively collected without being missed or scattered. At the same time, the inverted trapezoidal arrangement provides space for the tilting of the discharge plate 5, ensuring the smooth discharge of materials and improving the smoothness of the screening process.

[0026] The feed hopper 2 includes a cone-shaped body with a surrounding plate at its bottom. The bottom of the surrounding plate is close to but does not contact the outer surface of the conveyor belt 4. The surrounding plate has an opening for the screened raw material to pass through. A baffle plate 21 is rotatably connected to the opening. The rotating shaft 211 of the baffle plate 21 is connected to the conveyor roller 3 via a transmission mechanism 8. The cone-shaped body helps to concentrate and evenly distribute the material onto the conveyor belt 4, reducing material accumulation or blockage during feeding. The surrounding plate forms a physical barrier, preventing material from flowing out from the side without hindering the operation of the conveyor belt 4 itself. The material is scattered out, which not only ensures that all materials can be effectively screened, but also reduces material waste and cleaning work. When the conveyor belt 4 starts running, the conveyor roller 3 rotates, which drives the rotating shaft 211 of the baffle plate 21 to rotate through the transmission mechanism 8. This allows the baffle plate 21 to open or close the path for unqualified materials. When the baffle plate 21 is in the open state, the material is allowed to pass through the opening on the baffle plate with the conveyor belt 4, while when the baffle plate 21 is closed, the material is prevented from passing through. This helps to pause the material supply or adjust the material input in the screening process as needed.

[0027] The preferred transmission mechanism 8 includes a first transmission gear 81, a second transmission gear 82, and a reducer 83. The first transmission gear 81 is located at one end of a conveyor roller 3, and the second transmission gear 82 meshes with the first transmission gear 81. The input end of the reducer 83 is connected to the second transmission gear 82, and the output end of the reducer 83 is connected to one end of the rotating shaft 211. The function of the first transmission gear 81 is to transmit the rotational motion of the conveyor roller 3 to the second transmission gear 82. The second transmission gear 82 is not only responsible for transmitting power to the reducer 83, but also realizes torque conversion and initial speed adjustment through meshing with the first transmission gear. The function of the reducer 83 is to reduce the rotational speed and increase the torque, ensuring that the baffle plate 21 can open or close smoothly and powerfully. At the same time, since the rotational speed of the baffle plate 21 is relatively slow, when it opens, it allows the material on the conveyor belt 4 to be dragged a certain distance, increasing the residence time of the material on the conveyor belt 4 and contact with the screen hole 41, ensuring that qualified material in the material can pass through the screen hole 41 for a sufficient time, further improving the thoroughness and accuracy of screening.

[0028] The transmission mechanism 8 is preferably covered with a protective cover 9 on its outer side; the protective cover 9 not only protects the internal mechanical components from the influence of the external environment, but also improves the safety of operation and the overall aesthetics of the device.

[0029] Preferably, each conveyor roller 3 is provided with a limiting plate 31 at both ends to limit the conveyor belt 4; the limiting plate 31 prevents the conveyor belt 4 from shifting laterally or deviating from the center position during operation. The limiting plate 31 can effectively restrict the conveyor belt 4 on its predetermined path to ensure its smooth operation. The stable operation of the conveyor belt 4 ensures that the material can be fully distributed on the conveyor belt 4 and fully contact the screen holes 41, thereby improving the screening efficiency.

[0030] Preferably, each conveyor roller 3 is covered with an anti-slip layer on its outer side. The main function of the anti-slip layer is to increase the friction between the conveyor roller 3 and the conveyor belt 4, ensuring that the conveyor belt 4 can run smoothly and efficiently, and helping to prevent the conveyor belt 4 from slipping, thereby improving the reliability of the entire system. At the same time, the anti-slip layer reduces the relative sliding between the conveyor belt 4 and the conveyor roller 3, reducing the wear caused by friction, thereby extending their service life.

[0031] The upper end face of the preferred collection box 6 is open, and its side wall is constructed with an inclined portion 61 that is close to but does not contact the outer surface of the conveyor belt 4. This design allows unqualified materials falling from the conveyor belt 4 to fall directly into the collection box 6 without the need for additional guiding structures, which simplifies the material collection process and improves efficiency. The inclined portion 61 avoids friction or interference that may hinder the normal operation of the conveyor belt 4, while reducing the rebound phenomenon of falling materials from the collection box 6.

[0032] A brush plate 10 is preferably installed inside the screening box 1. The brush plate 10 is provided with bristles 101 that are in contact with the inner surface of the conveyor belt 4. During the operation of the conveyor belt 4, the bristles 101 effectively remove residual materials attached to it, prevent the screen holes 41 from being blocked, ensure the continuity and effectiveness of the screening process, and avoid the decrease in screening efficiency caused by the blockage of the screen holes 41.

[0033] To effectively adjust the tension of the conveyor belt 4 and prevent it from becoming too loose or too tight, thereby ensuring the stability and reliability of the device, a tensioning mechanism 11 is also included. The tensioning mechanism 11 includes a tensioning roller 111 parallel to the conveyor roller 3. Both ends of the tensioning roller 111 are rotatably connected to sliders 112. Mounting plates 113 are symmetrically installed on both sides of the screening box 1. The mounting plates 113 are provided with a first groove 114 for the sliders 112 to move in the direction of approaching or moving away from the conveyor belt 4. A first screw 115 is screwed onto the slider 112. One end of the first screw 115 is connected to the first... The inner wall of a chute 114 is rotatably connected, and the other end passes through the mounting plate 113 and is provided with a first handle 116 at its end. When it is necessary to adjust the tension of the conveyor belt, the first screw 115 is rotated, causing the slider 112 to move along the first chute 114, thereby driving the tension roller 111 to move closer to or away from the conveyor belt 4. In this way, the tension of the conveyor belt 4 can be adjusted to ensure that it is always in the best state. The first handle 116 makes the adjustment of the first screw 115 more convenient, ensuring that the tension of the conveyor belt 4 can be adjusted quickly and accurately according to actual needs.

[0034] The preferred mounting plate 113 has a second slide groove 117 communicating with the first slide groove 114. A locking block 118 is slidably connected in the second slide groove 117, moving towards or away from the first screw 115. A second screw 119 is rotatably mounted on the locking block 118 and screwed to the mounting plate 113. A second handle 120 is provided at the end of the second screw 119 away from the locking block 118. When the tension of the conveyor belt 4 is adjusted to a suitable state, the second screw 119 is rotated to push the locking block 118 to move along the second slide groove 117 until the locking block 118 contacts and fixes the first screw 115. This ensures that the first screw 115 and its connected slider 112 will not move unnecessarily in subsequent operations, thereby maintaining the stability of the tension of the conveyor belt 4. The second handle 120 makes the adjustment of the second screw 119 more convenient, ensuring that the position of the slider 112 can be quickly and accurately fixed according to actual needs.

[0035] The plastic particle processing screening device of this utility model, in operation, firstly uses the first handle 116 to adjust the first screw 115, causing the slider 112 to move along the first slide groove 114, thereby adjusting the position of the tension roller 111 to change the tension of the conveyor belt 4 until a suitable tension state is reached; by rotating the second handle 120, the second screw 119 is rotated, pushing the locking block 118 to move along the second slide groove 117. The locking block 118 moves until it contacts the first screw 115 and applies pressure to fix it; the plastic particles to be screened are poured into the feed hopper 2, and the plastic particles fall onto the conveyor belt 4. Small particles smaller than the size of the screen hole 41 fall through the screen hole 41 onto the discharge plate 5 and are discharged out of the screening box 1 through its inclined surface, while larger particles fall onto the conveyor belt 4; the drive motor is started, causing the conveyor roller 3 to open. The conveyor belt 4 starts to rotate, which in turn drives the material on the conveyor belt 4 to move. The transmission gear 81 rotates with the transmission roller 3. The rotational motion of the transmission gear 81 is transmitted to the transmission gear 82. The transmission gear 82 transmits the power to the input end of the reducer 83. The gear system inside the reducer 83 reduces the speed and increases the torque. Then, the adjusted power is transmitted to the rotating shaft 211 of the baffle plate through the output end. The rotating shaft 211 rotates, which drives the baffle plate 21 to rotate around its axis. The material is dragged a distance on the conveyor belt 4 by the baffle plate 21, so that it can fully contact the screen hole 41. Qualified material passes through, and unqualified material is transported to the end of the conveyor belt 4 and falls into the collection box 6. The bristles 101 on the brush plate 10 continuously clean the inner surface of the conveyor belt to prevent material residue and clogging of the screen hole 41, and ensure screening efficiency.

[0036] The screening device for processing plastic particles of this utility model can be installed, connected, or set up in a common mechanical manner, and any method that can achieve its beneficial effects can be implemented.

[0037] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A screening device for processing plastic particles, characterized in that, include: A screening box (1) is equipped with a feed hopper (2) on its top; several conveyor rollers (3) are rotatably installed inside the screening box (1) and arranged in an inverted trapezoidal shape; a conveyor belt (4) is tensioned and sleeved on the outside of the several conveyor rollers (3), and several screen holes (41) are evenly opened on the conveyor belt (4); a discharge plate (5) is installed in the trapezoidal space formed by the conveyor belt (4) and is arranged at an inclination, with one end fixedly connected to the inner wall of the screening box (1) and the other end extending through the screening box (1) to the outside; a collection box (6) is movably installed inside the screening box (1) to collect the raw materials screened on the conveyor belt (4); and a drive motor (7) is installed on the outside of the screening box (1) to drive the conveyor rollers (3) to rotate.

2. The screening device for processing plastic particles as described in claim 1, characterized in that, The feed hopper (2) includes a cone-shaped body with a surrounding plate at its bottom. The bottom of the surrounding plate is close to but does not contact the outer surface of the conveyor belt (4). The surrounding plate has an opening for the screened raw materials to pass through. A baffle plate (21) is rotatably connected inside the opening. The rotating shaft (211) of the baffle plate (21) is connected to the conveyor roller (3) through a transmission mechanism (8).

3. The screening device for processing plastic particles as described in claim 2, characterized in that, The transmission mechanism (8) includes a first transmission gear (81), a second transmission gear (82), and a reducer (83). The first transmission gear (81) is disposed at one end of one of the conveying rollers (3). The second transmission gear (82) meshes with the first transmission gear (81). The input end of the reducer (83) is connected to the second transmission gear (82), and the output end of the reducer (83) is connected to one end of the rotating shaft (211).

4. The screening device for processing plastic particles as described in claim 2, characterized in that, The transmission mechanism (8) is covered with a protective cover (9).

5. The screening device for processing plastic particles as described in claim 1, characterized in that, Each of the conveyor rollers (3) is provided with a limiting plate (31) at both ends to limit the conveyor belt (4).

6. The screening device for processing plastic particles as described in claim 1, characterized in that, Each conveyor roller (3) is covered with an anti-slip layer on the outside.

7. The screening device for processing plastic particles as described in claim 1, characterized in that, The upper end face of the collection box (6) is open, and its side wall is constructed with an inclined portion (61) that is close to but does not contact the outer surface of the conveyor belt (4).

8. The screening device for processing plastic particles as described in claim 1, characterized in that, The screening box (1) is equipped with a brush plate (10), and the brush plate (10) is provided with bristles (101) that are in contact with the inner surface of the conveyor belt (4).

9. The screening device for processing plastic particles as described in claim 1, characterized in that, It also includes a tensioning mechanism (11) for tensioning the conveyor belt (4), the tensioning mechanism (11) includes a tensioning roller (111) parallel to the conveyor roller (3), both ends of the tensioning roller (111) are rotatably connected to sliders (112), the screening box (1) is symmetrically mounted on both sides of the mounting plate (1), the mounting plate (113) is provided with a first groove (114) for the slider (112) to move in the direction close to or away from the conveyor belt (4), a first screw (115) is screwed onto the slider (112), one end of the first screw (115) is rotatably connected to the inner wall of the first groove (114), the other end passes through the mounting plate (113) and its end is provided with a first handle (116).

10. The screening device for processing plastic particles as described in claim 9, characterized in that, The mounting plate (113) has a second slide groove (117) communicating with the first slide groove (114). A locking block (118) that moves in a direction close to or away from the first screw (115) is slidably connected in the second slide groove (117). A second screw (119) is rotatably mounted on the locking block (118). The second screw (119) is screwed to the mounting plate (113). A second handle (120) is provided at the end of the second screw (119) away from the locking block (118).

Images