A pelletizer for processing PP sheet raw materials

Abstract

This utility model relates to a pelletizer for processing PP sheet raw materials. It includes a frame and a motor. The frame has a round shaft and a square shaft. A first roller body is coaxially fixed on the round shaft. The outer wall of the first roller body has several bottom teeth, and each bottom tooth has several guide grooves. A second roller body is slidably sleeved on the square shaft. The outer wall of the second roller body has several shearing teeth, the number of which corresponds to the number of guide grooves. The frame also includes a slide rail, a sliding seat, and a linear drive. The sliding seat has a first and a second pawl. Each end of the second roller body has a thrust bearing, and the two pawls abut against the outer sides of the two thrust bearings. This utility model can continuously and efficiently pelletize, and its overall structure is relatively simple and easy to maintain.

Description

Technical Field

[0001] This utility model relates to a pelletizer, and more particularly to a pelletizer for processing PP sheet raw materials. Background Technology

[0002] PP sheets, as a high-quality plastic material, are widely used in various fields due to their unique properties, such as packaging. PP sheets are widely used in packaging due to their high transparency, good barrier properties, low density, non-toxicity, hygiene, and recyclability. Specifically, PP sheets can be made into various products through secondary processing such as thermoforming, including food packaging boxes, pharmaceutical packaging containers, PP folders, and PP document bags. The production process of PP sheets requires melting the raw materials, which are generally in granular form to improve melting efficiency. To facilitate large-scale production of PP granules, pelletizers have emerged. Existing pelletizers utilize both rotary and fixed blades for pelletizing, achieving high production efficiency. To address the need for large-scale PP granule production, this invention proposes a new solution. Summary of the Invention

[0003] This invention provides a pelletizer for processing PP sheet raw materials, solving the problem of needing to produce PP granules on a large scale in the prior art.

[0004] The above-mentioned technical problems of this utility model are mainly solved by the following technical solution: a pelletizer for processing PP sheet raw materials, characterized in that: it includes a frame and a motor; a round shaft and a square shaft are horizontally rotatable on the frame; one end of the round shaft and the square shaft are coaxially fixed with mutually meshing and equal-sized transmission gears; any transmission gear is connected to the motor for transmission; a first roller body is also coaxially fixed on the round shaft; a plurality of bottom teeth are distributed in a circumferential array along its axial direction on the outer wall of the first roller body; a plurality of wire grooves are provided on the bottom teeth; a second roller body is slidably sleeved on the square shaft; a plurality of wire grooves are distributed in a circumferential array on the outer wall of the second roller body. The machine includes a dry shearing tooth, the number of which corresponds to the number of wire grooves, and the shearing teeth and bottom teeth mesh with each other. The width of the shearing tooth is less than the distance between any two adjacent wire grooves. The frame is also equipped with a horizontally arranged slide rail, a sliding seat slidably mounted on the slide rail, and a linear driver that drives the sliding seat to reciprocate. The sliding seat is equipped with a first pawl and a second pawl. Each end of the second hob body is equipped with a thrust bearing, and the two pawls abut against the outer sides of the two thrust bearings respectively. The linear driver can drive the sliding seat to move to one side so that the second hob body moves synchronously, thereby causing the shearing teeth to shear the wire grooves.

[0005] Several plastic strips produced by the extruder are cooled and directly fed into this invention. These plastic strips are directly introduced into the guide groove on the first roller body. The first and second roller bodies rotate in opposite directions at the same speed under the drive of a motor. The input speed of the plastic strips is consistent with the linear speed of the first roller body. At the same time, the linear driver can drive the sliding seat to reciprocate rapidly at a fixed frequency. In this way, the shearing teeth and the guide groove will perform shearing motion at a fixed frequency. Each shearing motion will cut the plastic strip in the guide groove, and the cut length is fixed. By increasing the number of guide grooves, the pelletizing efficiency can be increased. Therefore, this invention can continuously and efficiently pelletize, and the overall structure is relatively simple and easy to maintain. At the same time, both sides of the shearing teeth in this invention can participate in cutting, that is, one reciprocating motion of the second roller body can perform two cuts, so the cutting efficiency is also high.

[0006] Furthermore, the frame is also equipped with a brush holder, on which a brush is mounted, and the brush contacts the second roller cutter body. When the shearing teeth cut the plastic strip, there is a certain probability that the cut particles will stick to the shearing surface of the shearing teeth, that is, the narrow surfaces at both ends of the shearing teeth. The particles sticking to the shearing teeth will affect the next shearing action. Therefore, this invention is equipped with a brush. After each shearing action, the shearing teeth will pass through the brush, which can remove the particles stuck to the shearing teeth. The shearing teeth can perform the next shearing action after rotating one revolution.

[0007] Furthermore, the frame is also equipped with at least one traction assembly, which includes two rotating shafts, several guide wheels coaxially fixed on the rotating shafts, and a transmission assembly. The guide wheels on the two rotating shafts face each other, and each guide wheel has an annular arc groove. The two rotating shafts on the traction assembly rotate in opposite directions at the same speed, and the guide wheels on the two rotating shafts clamp the plastic strip on both sides from above and below, thereby pulling the plastic strip into the wire groove.

[0008] Furthermore, the present invention also includes a movable receiving hopper disposed below the first roller cutter body.

[0009] Therefore, this utility model has the following characteristics compared with the prior art: 1. This utility model can continuously and efficiently cut pellets, and the overall structure is relatively simple and easy to maintain; 2. At the same time, both sides of the shearing teeth on this utility model can participate in cutting, that is, the second roller body can perform two cuttings once it reciprocates, so the cutting efficiency is also high. Attached Figure Description

[0010] Appendix Figure 1 This is a schematic diagram of the structure of this utility model;

[0011] Appendix Figure 2 This is a structural schematic diagram of the first hob body and the second hob body;

[0012] Appendix Figure 3 This is a diagram of the traction structure of this utility model;

[0013] Appendix Figure 4 This is a front view of the second hob body moving to the right side of the first hob body;

[0014] Appendix Figure 5 This is a front view of the second hob body moving to the left side of the first hob body. Detailed Implementation

[0015] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0016] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0017] Example 1: See Figure 1 , Figure 2 and Figure 3A pelletizer for processing PP sheet raw materials includes a frame 100 and a motor 200. Two vertical mounting plates 110 are fixed on the frame. A round shaft 120 and a square shaft 130 are horizontally rotatable between the two mounting plates. One end of each shaft is coaxially fixed with a meshing, equally sized transmission gear 140. Either transmission gear is connected to the motor. A first roller cutter body 300 is also coaxially fixed on the round shaft. Ten bottom teeth 310 are arranged in a circumferential array along the outer wall of the first roller cutter body, and five guide grooves 311 are equidistantly arranged on the bottom teeth. A second roller cutter body 400 is slidably sleeved on the square shaft. Ten shearing teeth 410 are arranged in a circumferential array on the outer wall of the second roller cutter body. The number of shearing teeth and guide grooves... The shearing teeth and bottom teeth are consistent and correspond one-to-one. They mesh with each other. The width of the shearing teeth is less than the distance between any two adjacent wire grooves. The tooth profiles of the bottom teeth and shearing teeth are consistent, both being involute tooth profiles. The top of the two mounting plates is also provided with a horizontally arranged slide rail 150, a sliding seat 160 slidably mounted on the slide rail, and a linear actuator 170 that drives the sliding seat to reciprocate. The linear actuator is specifically a double-rod cylinder. The sliding seat is provided with a first paddle 161 and a second paddle 162. Each end of the second hob body is provided with a thrust bearing 180, and the two paddles abut against the outer sides of the two thrust bearings respectively. The linear actuator can drive the sliding seat to move to one side so that the second hob body moves synchronously, thereby causing the shearing teeth to perform a shearing motion with the wire groove (see...). Figure 4 and Figure 5 ).

[0018] The distance from the wire groove to the axis of the first roller body is r, and the number of bottom teeth is a. In this embodiment, the length of the cut particle l is the distance between adjacent bottom teeth, l = 2πr / a. Therefore, the number of r and a can be customized according to the actual required length of the PP particles. When the first roller body rotates once, the reciprocating cutting action of the corresponding shearing teeth is a / 2 times. Therefore, when the rotation speed of the first roller body is b revolutions / minute, the operating frequency of the cylinder is ab / 2 times / minute.

[0019] See Figure 3 The frame is also equipped with a brush holder 190, on which a brush 191 is mounted. The brush contacts the second roller cutter body. When the shearing teeth cut the plastic strip, there is a certain probability that the cut particles will stick to the shearing surface of the shearing teeth, that is, the narrow surfaces at both ends of the shearing teeth. The particles stuck to the shearing teeth will affect the next shearing action. Therefore, this embodiment is equipped with a brush. After one shearing action, the shearing teeth will pass through the brush, which can remove the particles stuck to the shearing teeth. The shearing teeth can perform the next shearing action after rotating one revolution.

[0020] See Figure 3The frame is also equipped with two traction assemblies 500. Each traction assembly includes two rotating shafts 510, five guide wheels 520 coaxially fixed on the rotating shafts, and a transmission assembly. The guide wheels on the two rotating shafts face each other, and each guide wheel has an annular arc groove 521. The two rotating shafts on the traction assembly rotate in opposite directions at the same speed, and the guide wheels on the two rotating shafts clamp the plastic strip on both sides, thus pulling the plastic strip into the guide groove.

[0021] See Figure 1 This embodiment also includes a movable receiving hopper 600 located below the first roller cutter body.

[0022] Five plastic strips 10 produced by the extruder are cooled and directly fed into this embodiment. These strips are guided by two sets of traction units into the guide groove on the first roller body. The first and second roller bodies rotate in opposite directions at the same speed under the drive of a motor. The input speed of the plastic strips is consistent with the linear speed of the first roller body. Simultaneously, the linear driver can drive the sliding seat to reciprocate rapidly at a fixed frequency. This causes the shearing teeth and the guide groove to perform shearing motion at a fixed frequency. Each shearing motion cuts the plastic strip in the guide groove to a fixed length. By increasing the number of guide grooves, the pelletizing efficiency can be increased. Therefore, this embodiment can continuously and efficiently pelletize, and the overall structure is relatively simple and easy to maintain.

[0023] This invention can be modified in many ways, as will be apparent to those skilled in the art, and such modifications are not considered to depart from the scope of this invention. All such modifications that are obvious to those skilled in the art are included within the scope of these claims.

Claims

1. A pelletizer for processing a PP sheet raw material, characterized by: The machine includes a frame and a motor. A circular shaft and a square shaft are horizontally rotatable on the frame. One end of each shaft is coaxially fixed with a meshing, equally sized transmission gear. Either transmission gear is connected to the motor. A first hob body is also coaxially fixed on the circular shaft. The outer wall of the first hob body has a circumferential array of several bottom teeth distributed along its axial direction. Each bottom tooth has several wire guide grooves. A second hob body is slidably sleeved on the square shaft. The outer wall of the second hob body has a circumferential array of several shearing teeth, the number of which is the same as the number of wire guide grooves and they are paired one-to-one. The shearing teeth and the bottom teeth mesh with each other. The width of the shearing teeth is less than the distance between any two adjacent wire grooves. The frame is also provided with a horizontally arranged slide rail, a sliding seat slidably mounted on the slide rail, and a linear driver that drives the sliding seat to reciprocate. The sliding seat is provided with a first pawl and a second pawl. Each end of the second hob body is provided with a thrust bearing, and the two pawls abut against the outer sides of the two thrust bearings respectively. The linear driver can drive the sliding seat to move to one side so that the second hob body moves synchronously, thereby causing the shearing teeth to shear the wire groove.

2. The pelletizer for processing PP sheet raw material according to claim 1, characterized in that: The frame is also provided with a brush holder, on which a brush is provided, and the brush is in contact with the second roller body.

3. The pelletizer for processing of PP sheet raw material according to claim 1 or 2, characterized in that: The frame is also equipped with at least one traction assembly, which includes two rotating shafts, several guide wheels coaxially fixed on the rotating shafts, and a transmission assembly. The guide wheels on the two rotating shafts are directly opposite each other, and the guide wheels are provided with annular arc grooves.

4. The pelletizer for processing PP sheet raw material according to claim 1, characterized in that: It also includes a movable receiving hopper located below the first roller cutter body.

5. The pelletizer for processing PP sheet raw material according to claim 1, characterized in that: The tooth profiles of the bottom tooth and the shearing tooth are the same, both being involute tooth profiles.

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