A plastic pellet production plastic pelletizer

Abstract

The utility model relates to the technical field of plastic pelletizing, specifically relates to a plastic pelletizing device for plastic particle production. The utility model discloses a screw extruder shell, the one side fixed mounting of screw extruder shell has the discharge tray, the annular array of discharge tray is opened and is equipped with a plurality of discharge holes. The utility model, through the reverse rotation threaded rod drive sleeve ring far from the discharge tray, can remove the inclined plane locking force between the movable wedge and the fixed wedge, and makes the sleeve ring separate from the base plate periphery, then the base plate can be easily taken out from the embedded groove, the overall disassembly of the old tool assembly is completed, when installing, only need to position the new base plate to the embedded groove with the magnetic attraction, the forward rotation threaded rod pushes the sleeve ring forward, can press all the wedge simultaneously, complete the overall locking, the structure simplifies the tool changing process, changes the time from the traditional bolt to dozens of minutes needed to disassemble one by one to several minutes, improves the equipment utilization and production continuity.

Description

Technical Field

[0001] This utility model relates to the field of plastic pelletizing technology, and more specifically, to a plastic pelletizing device for producing plastic particles. Background Technology

[0002] Plastic pellets are a basic raw material in the plastics processing industry. They are typically produced by extruding molten plastic into strips through a die using a plastic pelletizing machine, followed by cooling and cutting. During the pelletizing process, the high-speed rotating cutter is the key component for cutting the plastic strips. However, due to long-term wear or the need to adapt to different materials and pellet sizes, the cutter must be replaced or adjusted periodically.

[0003] However, in existing technologies, the process of replacing cutters is usually extremely cumbersome and difficult. Traditional cutter assemblies are often directly fastened to the rotating frame with multiple bolts. Operators need to remove a large number of bolts one by one to remove the old blades. When installing new blades, they must tighten them one by one and carefully adjust the gap between all blades and the discharge die head to ensure consistency. This process is not only time-consuming and labor-intensive, but also requires a high level of skill from the operators. The slightest carelessness can lead to uneven gaps, affecting the pelletizing quality or damaging the equipment. This inefficient replacement method directly results in excessive downtime, restricting the continuity and efficiency of the production line, while also increasing maintenance costs and the risk of human error. Utility Model Content

[0004] The purpose of this invention is to provide a plastic pelletizing device for producing plastic particles, so as to solve the problems mentioned in the background art.

[0005] To address the above problems, the present invention aims to provide a plastic pelletizing device for producing plastic particles, comprising a screw extruder housing, a discharge plate fixedly mounted on one side of the screw extruder housing, a plurality of discharge holes arranged in a circular array on the discharge plate, a servo motor fixedly mounted on the side of the screw extruder housing near the discharge plate via a bracket, a mounting frame coaxially mounted on the end of the servo motor output shaft facing the discharge plate, the axis of the mounting frame being coaxial with the axis of the discharge plate, a plurality of cutter assemblies arranged in a circular array on the mounting frame, each cutter assembly comprising a base plate, a cutter fixedly mounted on the side of the base plate away from the mounting frame via a positioning post, and a locking mechanism provided on the mounting frame for synchronously fixing the position of all base plates.

[0006] As a further improvement to this technical solution, an embedded groove is provided on the mounting bracket at a position corresponding to each substrate, and the substrate is located inside the corresponding embedded groove.

[0007] As a further improvement to this technical solution, a permanent magnet is fixedly installed on the side of the embedded groove near the axis of the mounting frame, and the substrate is made of ferromagnetic material, and the substrate and the permanent magnet are magnetically attracted to each other.

[0008] As a further improvement to this technical solution, a fixed wedge block is fixedly installed on the side of the substrate away from the mounting frame, and the locking mechanism includes a collar that is slidably sleeved on the mounting frame, and a movable wedge block is fixedly installed on the collar at a position corresponding to each fixed wedge block.

[0009] As a further improvement to this technical solution, the locking mechanism also includes several sliding sleeves integrally formed on the collar in an annular array. A threaded rod is rotatably mounted on the mounting bracket. The threaded rod is threadedly engaged with one of the sliding sleeves. Guide rods are slidably mounted inside the remaining sliding sleeves. The guide rods are fixedly mounted on the mounting bracket.

[0010] As a further improvement to this technical solution, when the collar moves toward the discharge tray, the collar is slidably sleeved on the outside of all substrates.

[0011] As a further improvement to this technical solution, when the collar moves toward the discharge plate, the moving wedge block contacts the corresponding fixed wedge block, and the contact surfaces of the moving wedge block and the fixed wedge block are both inclined surfaces.

[0012] As a further improvement to this technical solution, a protective cover is fixedly installed on the side of the screw extruder housing near the discharge plate, and the discharge plate, mounting bracket, tool assembly and locking mechanism are all located inside the protective cover.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. The plastic pelletizing device for producing plastic particles releases the inclined locking force between the moving wedge and the fixed wedge by rotating the threaded rod in the opposite direction to drive the collar away from the discharge plate, thus disengaging the collar from the outer periphery of the base plate. The base plate can then be easily removed from the inner groove, completing the overall disassembly of the old tool assembly. During installation, simply magnetically position the new base plate into the inner groove, and rotate the threaded rod in the forward direction to push the collar forward, simultaneously pressing all wedges to complete the overall locking. This structure simplifies the tool changing process, reducing the replacement time from tens of minutes required by disassembling bolts one by one to several minutes, improving equipment utilization and production continuity, while reducing the labor intensity and skill requirements of operators. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is one of the partial structural schematic diagrams of this utility model; Figure 3 This is the second partial structural schematic diagram of the present utility model; Figure 4 This is the third partial structural schematic diagram of this utility model; Figure 5 This is a schematic diagram of the mounting bracket, tool assembly, and locking mechanism of this utility model; Figure 6 For the present utility model Figure 5 Exploded view.

[0015] The meanings of the labels in the diagram are as follows: 1. Screw extruder housing; 11. Discharge plate; 111. Discharge hole; 2. Servo motor; 3. Protective cover; 4. Mounting bracket; 41. Embedded groove; 411. Permanent magnet; 5. Tool assembly; 51. Base plate; 52. Positioning post; 53. Cutting blade; 54. Fixed wedge block; 6. Locking mechanism; 61. Collar; 62. Moving wedge; 63. Sliding sleeve; 64. Threaded rod; 65. Guide rod. 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] Example 1 Please see Figures 1-3 As shown, the purpose of this embodiment is to provide a plastic pelletizing device for producing plastic particles, including a screw extruder housing 1, a cooling device installed at the bottom of the screw extruder housing 1, and a discharge plate 11 fixedly installed on one side of the screw extruder housing 1, with a plurality of discharge holes 111 arranged in a ring array on the discharge plate 11.

[0018] The screw extruder is used to continuously extrude molten plastic raw materials through the discharge port 111. The extruded strip is cooled by a cooling device near the discharge plate 11, forming a plastic strip with a diameter that matches the inner diameter of the discharge port 111. It should be noted that both the screw extruder and the cooling device are commercially available and mature equipment in the field of plastic granulation, and their specific working principles are well known in the art and will not be elaborated here.

[0019] To cut and granulate the extruded plastic strips, refer to Figure 4A servo motor 2 is fixedly installed on the side of the screw extruder housing 1 near the discharge plate 11 by a bracket. A mounting frame 4 is fixedly installed on the end of the output shaft of the servo motor 2 facing the discharge plate 11. The axis of the mounting frame 4 is coaxial with the axis of the discharge plate 11. Several tool assemblies 5 are arranged in a ring array on the mounting frame 4. The tool assemblies 5 are prefabricated parts.

[0020] The structure of tool assembly 5 is described in detail below, referring to... Figure 5 and Figure 6 The tool assembly 5 includes a base plate 51. A cutter 53 is fixedly mounted on the side of the base plate 51 away from the mounting bracket 4 via a positioning post 52. The blade width of the cutter 53 should be less than the distance between two adjacent discharge holes 111, and a gap of approximately 0.2 mm should be maintained between its blade and the surface of the discharge plate 11 to prevent wear between the cutter 53 and the discharge plate 11. In addition, a locking mechanism 6 is provided on the mounting bracket 4. The locking mechanism 6 is used to simultaneously fix the position of all base plates 51, thereby achieving a secure overall installation of the tool assembly 5.

[0021] When the servo motor 2 drives the mounting frame 4 to rotate, the mounting frame 4 drives all the cutting tool assemblies 5 to rotate synchronously. The axes of all the discharge holes 111 are on the rotation path of the cutter 53. Therefore, after the strip is extruded from the discharge hole 111 to a certain length, the rotating cutter 53 will cut it off to form plastic granules.

[0022] To prevent plastic particles from scattering under the centrifugal force of the high-speed rotation of the cutter 53, a protective cover 3 is fixedly installed on the side of the screw extruder housing 1 near the discharge plate 11. The discharge plate 11, mounting bracket 4, cutter assembly 5, and locking mechanism 6 are all located inside the protective cover 3. The protective cover 3 can block the plastic particles from scattering, and an outlet is opened at the bottom of the protective cover 3. After the plastic particles collide with the inner wall of the protective cover 3, they fall from the outlet under the action of gravity. A collection container can be set directly below the outlet to collect the plastic particles.

[0023] It should be noted that by coordinating the extrusion speed of the screw extruder with the output shaft speed of the servo motor 2, the length of the cut plastic granules can be effectively adjusted to meet different production requirements.

[0024] An embedded groove 41 is provided on the mounting bracket 4 at a position corresponding to each substrate 51. The substrate 51 is located inside the corresponding embedded groove 41, and a permanent magnet 411 is fixedly installed on the side of the embedded groove 41 near the axis of the mounting bracket 4. The substrate 51 is made of ferromagnetic material. The substrate 51 and the permanent magnet 411 are magnetically attracted. Through the magnetic attraction between the substrate 51 and the permanent magnet 411, the substrate 51 can be pre-fixed inside the corresponding embedded groove 41. The embedded groove 41 restricts the relative movement between the substrate 51 and the mounting bracket 4, thereby realizing the initial installation of the tool assembly 5.

[0025] To further restrict the substrate 51 from moving out of the recess 41, a fixed wedge 54 is fixedly installed on the side of the substrate 51 away from the mounting bracket 4. The structure of the locking mechanism 6 is detailed below. The locking mechanism 6 includes a collar 61 slidably sleeved on the mounting bracket 4. A movable wedge 62 is fixedly installed on the collar 61 at a position corresponding to each fixed wedge 54. The locking mechanism 6 also includes several sliding sleeves 63 integrally formed in a ring array on the collar 61. A threaded rod 64 is rotatably installed on the mounting bracket 4. The threaded rod 64 is threadedly engaged with one of the sliding sleeves 63. A bolt head is coaxially fixed at the end of the threaded rod 64 away from the discharge plate 11, which allows the operator to rotate the threaded rod 64 with a wrench. Guide rods 65 are slidably installed inside the remaining sliding sleeves 63. The guide rods 65 are fixedly installed on the mounting bracket 4. It should be noted that the axes of the guide rod 65, the threaded rod 64, and the mounting bracket 4 are all arranged in parallel, and the threaded rod 64 and the two guide rods 65 are distributed in an equilateral triangle. This symmetrical layout ensures that the collar 61 is subjected to uniform force when moving, and will not jam or wear due to uneven load. This transmission and guiding method with equilateral triangle distribution is not only structurally stable and rigid enough to effectively resist the uneven lateral force generated when the moving wedge block 62 is pressed, but also has mature processing and assembly technology, and has high feasibility and practicality. It is the key design to achieve smooth and precise linear movement of the collar 61.

[0026] When it is necessary to install the tool assembly 5, the operator first removes the protective cover 3, and then uses the permanent magnet 411 to pre-fix all the base plates 51 of the tool assembly 5 into the corresponding inner grooves 41. Then, the operator uses a wrench to rotate the threaded rod 64. Through the threaded engagement between the threaded rod 64 and the sliding sleeve 63, the collar 61 is driven to move smoothly towards the discharge tray 11 along the axis of the mounting frame 4 under the precise guidance of the guide rod 65. The collar 61 is slidably sleeved on the outside of all the base plates 51. The collar 61 prevents the base plates 51 from coming out of the inner grooves 41. At the same time, the collar 61 drives the moving wedge block 62 to move, so that the moving wedge block 62 contacts the corresponding fixed wedge block 54. The contact surfaces of the moving wedge block 62 and the fixed wedge block 54 are both inclined surfaces. Therefore, the moving wedge block 62 will push the fixed wedge block 54 and the base plate 51 to press them together in the axis of the mounting frame 4, thereby enhancing the fixing stability of the base plate 51 in the inner groove 41. After the installation of the tool assembly 5 is completed, the protective cover 3 is installed.

[0027] When the cutter assembly 5 needs to be replaced, the operator removes the protective cover 3 and uses a wrench to rotate the threaded rod 64 in the opposite direction, so that the collar 61 moves away from the discharge plate 11. After the collar 61 is disengaged from the outside of the substrate 51, the locking of the substrate 51 can be released, thereby removing the substrate 51 from the inner groove 41, realizing the overall disassembly and replacement of the cutter assembly 5, so as to replace it with a sharp cutter 53 or a cutter with a specific tilt angle to meet different plastic pelletizing requirements.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A plastic pelletizing device for producing plastic particles, comprising a screw extruder housing (1), wherein a discharge disc (11) is fixedly installed on one side of the screw extruder housing (1), and the discharge disc (11) has a plurality of discharge holes (111) arranged in a circular array on the discharge disc (11), characterized in that: A servo motor (2) is fixedly mounted on the side of the screw extruder housing (1) near the discharge plate (11) by a bracket. A mounting frame (4) is fixedly mounted on the end of the output shaft of the servo motor (2) facing the discharge plate (11). The axis of the mounting frame (4) is coaxial with the axis of the discharge plate (11). Several tool assemblies (5) are arranged in a ring array on the mounting frame (4). The tool assembly (5) includes a base plate (51). A cutter (53) is fixedly mounted on the side of the base plate (51) away from the mounting frame (4) by a positioning post (52). A locking mechanism (6) is provided on the mounting frame (4). The locking mechanism (6) is used to simultaneously fix the position of all base plates (51).

2. The plastic pelletizing device for producing plastic particles according to claim 1, characterized in that: The mounting bracket (4) has an embedded groove (41) at a position corresponding to each substrate (51), and the substrate (51) is located inside the corresponding embedded groove (41).

3. The plastic pelletizing device for producing plastic particles according to claim 2, characterized in that: A permanent magnet (411) is fixedly installed on the side of the embedded groove (41) near the axis of the mounting bracket (4). The substrate (51) is made of ferromagnetic material, and the substrate (51) and the permanent magnet (411) are magnetically attracted.

4. The plastic pelletizing device for producing plastic particles according to claim 1, characterized in that: A fixed wedge block (54) is fixedly installed on the side of the substrate (51) away from the mounting frame (4). The locking mechanism (6) includes a collar (61) that is slidably sleeved on the mounting frame (4). A movable wedge block (62) is fixedly installed on the collar (61) at a position corresponding to each fixed wedge block (54).

5. The plastic pelletizing apparatus for producing plastic particles according to claim 4, characterized in that: The locking mechanism (6) also includes several ring arrays of sliding sleeves (63) integrally formed on the collar (61). A threaded rod (64) is rotatably mounted on the mounting frame (4). The threaded rod (64) is threadedly engaged with one of the sliding sleeves (63). Guide rods (65) are slidably mounted inside the remaining sliding sleeves (63). The guide rods (65) are fixedly mounted on the mounting frame (4).

6. The plastic pelletizing apparatus for producing plastic particles according to claim 4, characterized in that: As the collar (61) moves toward the discharge tray (11), the collar (61) slides around the outside of all the substrates (51).

7. The plastic pelletizing apparatus for producing plastic particles according to claim 4, characterized in that: When the collar (61) moves toward the discharge plate (11), the moving wedge (62) contacts the corresponding fixed wedge (54), and the contact surfaces of the moving wedge (62) and the fixed wedge (54) are both inclined surfaces.

8. The plastic pelletizing apparatus for producing plastic particles according to claim 1, characterized in that: A protective cover (3) is fixedly installed on the side of the screw extruder housing (1) near the discharge plate (11). The discharge plate (11), mounting bracket (4), tool assembly (5) and locking mechanism (6) are all located inside the protective cover (3).

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