A pretreatment mechanism for PVC plastic particles hot melting

Abstract

The utility model discloses a kind of pretreatment mechanism for PVC plastic particle hot melting, including material cylinder, the compression stirring rod of rotation installation in material cylinder inside and the hot melting cylinder of fixed setting in material cylinder inside, material cylinder top end is equipped with the reduction motor for driving the rotation of compression stirring rod.Said compression stirring rod includes taper shaft, spiral arrangement in the rotating vane of taper shaft surface and the stirring shaft rod at its bottom end, hot melting cylinder surface is equipped with several homogenization holes, and along axial fixed mounting has electric heating ring.By taper compression structure and spiral conveying cooperation, PVC plastic particle is gradually compacted and forms stable material flow in conveying process.The utility model integrates compression, heating, hot melting and mixing function in the same structure, realizes the efficient pretreatment of PVC plastic particle before entering extrusion or molding equipment, compact structure, stable operation, it is favorable to improve subsequent processing quality and production efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of plastic processing pretreatment equipment, specifically a pretreatment mechanism for hot melting of PVC plastic particles. Background Technology

[0002] In the processing of PVC plastic particles, such as extrusion molding and injection molding, it is usually necessary to mix PVC plastic particles with different physical properties or different colors in a certain proportion according to the product performance or appearance requirements, and then feed them into the extruder for heating, melting and molding. On existing production lines, the common practice is to directly feed PVC plastic particles of various colors or different proportions into the extruder hopper after simple metering, and the screw inside the extruder completes the conveying, heating and mixing process.

[0003] In the aforementioned technical solutions, the extruder itself primarily focuses on continuous conveying and establishing molding pressure. Its internal screw structure is mainly axially driven, resulting in limited mixing. Furthermore, effective homogeneous mixing is difficult to achieve before the material is fully heated and melted. Especially when multi-colored or multi-component granules are simultaneously fed into the extruder, the lack of independent pre-mixing and preheating structures for different granules before entering the extruder often leads to problems such as uneven heating and asynchronous melting.

[0004] Furthermore, while some existing production lines have simple feeding or buffering devices at the front end of the extruder, these devices typically only function as conveyors or temporary storage units, lacking the ability to compress, heat, and homogenize the materials. They cannot adequately premix multi-colored or multi-component PVC plastic particles before they enter the extruder. The materials only begin to mix and melt inside the extruder, which not only increases the load on the extruder but also easily leads to localized temperature concentration zones in the screw, causing particle agglomeration, localized overheating, and even material performance degradation.

[0005] Meanwhile, in traditional extrusion processes, functions such as conveying, heating, and mixing are often distributed across different equipment or rely on a single extrusion screw. The process is lengthy, involves many intermediate steps, requires a large amount of equipment space, and limits production cycle time and processing efficiency, making it difficult to meet the production demands for PVC products with high uniformity and high stability.

[0006] Therefore, existing technologies in the pretreatment stage of PVC plastic particles generally suffer from problems such as multi-colored particles directly entering the extruder, lack of independent premixing and preheating structures, insufficient uniformity of hot melting and mixing, and high risk of local overheating. There is an urgent need for an integrated mechanism that can compress, heat, melt and homogenize PVC plastic particles before they enter the extruder, so as to improve the material state and enhance the quality of subsequent extrusion molding. Utility Model Content

[0007] This invention aims to solve the problems in the existing PVC plastic particle processing, where multi-colored or multi-component particles are usually only simply proportioned and fed into the extruder before entering the extruder, lacking an independent premixing and preheating structure, resulting in asynchronous melting, uneven mixing, local overheating, and a high risk of agglomeration. The invention provides an integrated pretreatment mechanism that can compress, heat, melt, and homogenize PVC plastic particles before they enter the extrusion or molding equipment.

[0008] To achieve the above objectives, the technical solution provided by this utility model is as follows: a pretreatment mechanism for hot melting of PVC plastic particles, comprising a material cylinder, a compression stirring rod, and a hot melting cylinder fixedly disposed inside the material cylinder. The compression stirring rod is rotatably mounted inside the material cylinder, and a reduction motor for driving the compression stirring rod to rotate is provided at the top of the material cylinder. The compression stirring rod includes a conical shaft, spiral blades arranged on the surface of the conical shaft, and a stirring shaft fixed to the bottom end of the conical shaft. The surface of the hot melting cylinder is provided with several homogenizing holes, and several electric heating rings are fixedly mounted on its surface. Both the conical shaft and the hot melting cylinder have a conical structure, so that the material is gradually compressed during the rotation of the compression stirring rod and passes through the homogenizing holes in a hot melting state.

[0009] In a preferred embodiment, the material cylinder is further configured such that a through hole is provided on one side and a storage hopper is fixedly connected thereto, for feeding various types of PVC plastic particles. Specifically, the storage hopper allows PVC plastic particles of different initial states or different colors to uniformly enter the working area of ​​the compression agitator after entering the material cylinder, creating conditions for subsequent synchronous compression and heat-melting treatment.

[0010] In a preferred embodiment, the barrel is further configured such that its bottom end has a discharge port located at the axis, for communication with an extruder. Specifically, this allows the PVC material stream, after heat melting and homogenization, to be continuously and stably conveyed to subsequent extrusion or molding equipment.

[0011] In a preferred embodiment, the cone shaft and the vanes on its surface are further configured such that the diameter of one end of the hot melt cylinder gradually decreases, and the hot melt cylinder has a conical structure with a tapered bottom. Specifically, by forming a gradually narrowing material channel, the PVC plastic particles are continuously compacted during the conveying process, establishing a stable axial pressure, which is beneficial for the material to be heated in the hot melt cylinder and form a continuous flow.

[0012] In a preferred embodiment, the stirring shaft is further configured such that its surface is provided with a plurality of spirally arranged stirring blades, and the stirring shaft is located below the hot-melt cylinder. Specifically, by subjecting the hot-melt material flow after passing through the homogenizing hole to secondary agitation, the material is further uniformly mixed after compression and hot melting, thereby improving the consistency of the material flow.

[0013] In a preferred embodiment, the hot melt cylinder is further configured as follows: the hot melt cylinder is a thermally conductive metal component, and several electric heating rings are evenly distributed along the axial direction of the hot melt cylinder. Specifically, the hot melt cylinder is heated as a whole by the electric heating rings, so that heat is evenly transferred to the interior of the material through the hot melt cylinder, improving the stability of the hot melt process of PVC plastic particles and avoiding local overheating.

[0014] In a preferred embodiment, the homogenizing holes are further configured such that they are distributed in a matrix along the circumferential direction of the hot-melt cylinder. Specifically, the PVC material in the hot-melt state is dispersed, sheared, and re-merged as it passes through the homogenizing holes, thereby achieving homogenization of the material.

[0015] The beneficial effects achieved by this utility model are as follows:

[0016] 1. In this utility model, by integrating the compression agitator, the hot melt cylinder, and the electric heating ring into the same material cylinder, the PVC plastic particles can be compressed, heated, and pre-heated during the conveying process, realizing the integrated operation of conveying, hot melting, and mixing homogenization, reducing intermediate steps, with a compact structure and high overall processing efficiency, and effectively shortening the pre-treatment time of materials before entering the extrusion or molding process.

[0017] 2. In this utility model, the hot melt cylinder is made of thermally conductive metal material and electric heating rings are evenly arranged on its surface. With the continuous rotation and stirring of the compression stirring rod, the PVC plastic particles form a uniform and dynamic contact state with the inner wall of the hot melt cylinder and the heating area. This avoids the material from staying in a local area for a long time, causing overheating or clumping, and improves the uniformity and stability of the hot melt process, which is beneficial to the improvement of the subsequent extrusion molding quality. Attached Figure Description

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

[0019] Figure 2 This is a schematic diagram of the internal structure of the material cylinder according to an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the compression stirring rod and hot melt cylinder structure according to one embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the compression agitator structure according to one embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the hot melt cylinder structure according to an embodiment of the present invention.

[0023] Figure label:

[0024] 100. Material cylinder; 110. Storage hopper; 120. Gear motor;

[0025] 200. Compression agitator; 210. Conical shaft; 220. Rotary blade; 230. Stirring shaft;

[0026] 300, hot melt cylinder; 310, homogenized hole; 320, electric heating ring. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features of the present utility model can be combined with each other.

[0028] It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this invention.

[0029] The following describes, with reference to the accompanying drawings, some embodiments of the present invention, a pretreatment mechanism for hot melting of PVC plastic particles.

[0030] Combination Figure 1 - Figure 5 As shown, the present invention provides a pretreatment mechanism for hot melting of PVC plastic particles, including a material cylinder 100, a compression stirring rod 200, and a hot melting cylinder 300 fixedly disposed inside the material cylinder 100.

[0031] In this embodiment, the material cylinder 100 is arranged vertically to provide a closed working space for the compression, hot melting, and homogenization of PVC plastic particles. The compression agitator 200 is rotatably mounted inside the material cylinder 100, and a geared motor 120 is provided at the top of the material cylinder 100. The geared motor 120 is used to drive the compression agitator 200 to rotate around its own axis.

[0032] The compression agitator 200 includes a conical shaft 210, spiral blades 220 arranged on the surface of the conical shaft 210, and a stirring shaft 230 fixed to the bottom end of the conical shaft 210. A hot melt cylinder 300 is fixedly disposed inside the material cylinder 100. The surface of the hot melt cylinder 300 has several homogenizing holes 310, and several electric heating rings 320 are fixedly installed on its surface. Both the conical shaft 210 and the hot melt cylinder 300 have a conical structure. During the rotation of the compression agitator 200, PVC plastic particles are compressed and pass through the homogenizing holes 310.

[0033] In this embodiment, a through hole is provided on one side of the material cylinder 100, and a storage hopper 110 is fixedly connected to the through hole. The storage hopper 110 is used to continuously feed PVC plastic particles into the material cylinder 100, which can be used to meet the feeding needs of PVC plastic particles in various initial states or different colors, so that the material enters the working area of ​​the compression stirring rod 200 after entering the material cylinder 100.

[0034] In this embodiment, the bottom end of the barrel 100 is provided with a discharge port located at the axis, which is used to connect with the subsequent extruder or molding equipment. The PVC material flow after hot melting and homogenization is discharged from the discharge port under the action of gravity and compression, realizing continuous connection with downstream equipment.

[0035] In this embodiment, the diameter of the tapered shaft 210 and its surface blades 220 gradually decreases towards one end of the hot melt cylinder 300, and the hot melt cylinder 300 has an overall tapered structure with a tapered bottom. Through the above structural cooperation, during the rotation and conveying process of the compression agitator 200, PVC plastic particles gradually enter the space region with a reduced cross-section, are compacted under the continuous pushing action of the blades 220, and establish stable axial pressure, providing favorable conditions for subsequent hot melting and homogenization processing.

[0036] In this embodiment, the stirring shaft 230 is located below the hot melt cylinder 300, and its surface is provided with several spirally arranged stirring blades. By rotating synchronously with the compression stirring rod 200, the hot melt material flow after passing through the homogenization hole 310 is agitated a second time, so that the material is further mixed evenly after compression and hot melting, thereby improving the consistency and stability of the material flow.

[0037] In this embodiment, the hot melt cylinder 300 is made of a thermally conductive metal material, and several electric heating rings 320 are evenly distributed along the axial direction of the hot melt cylinder 300. After the electric heating rings 320 are energized, they heat the hot melt cylinder 300 as a whole. The heat is evenly transferred to the PVC plastic particles in contact with it through the hot melt cylinder 300, so that the material gradually heats up and enters the hot melt state during the compression and propulsion process, thereby avoiding local overheating or uneven heating.

[0038] In this embodiment, a plurality of homogenizing holes 310 are distributed in a matrix along the circumferential direction of the hot melt cylinder 300. When the PVC material in the hot melt state passes through the homogenizing holes 310 under pressure, the material flow is divided, sheared and recombined, realizing the homogenization treatment of the material, which is beneficial to the full mixing of PVC plastic particles with different initial states or different colors under hot melt conditions.

[0039] Working principle and usage process of this utility model:

[0040] When using this utility model, PVC plastic particles are first fed into the inside of the material cylinder 100 through the storage hopper 110 located on one side of the material cylinder 100, and then enter the working area of ​​the compression agitator 200 under the action of gravity.

[0041] After the geared motor 120 starts, it drives the compression agitator 200, which is mounted inside the material cylinder 100, to rotate around its own axis. As the compression agitator 200 rotates, the spirally arranged blades 220 on the surface of the conical shaft 210 exert an axial pushing effect on the incoming PVC plastic particles, causing the material to be gradually conveyed downwards along the axial direction of the material cylinder 100. Since the diameter of the conical shaft 210 and the blades 220 gradually decreases at the end facing the hot melt cylinder 300, and the hot melt cylinder 300 has a conical structure, the PVC plastic particles gradually enter the compression zone with a reduced cross-section during the conveying process. Thus, under the continuous pushing action of the blades 220, they are compacted and form a stable axial pressure, achieving the compression and propulsion of the material.

[0042] As the material is compressed and propelled, a hot melt cylinder 300, fixedly positioned inside the material cylinder 100, forms a covering channel for the material. Electric heating rings 320, evenly distributed on the surface of the hot melt cylinder 300, are energized to continuously heat the cylinder. Heat is conducted through the heat-conducting metal of the hot melt cylinder 300 to the interior, causing the PVC plastic particles to gradually heat up and enter a molten state during compression and conveying, forming a continuous material flow. Under pressure, the molten material flow is divided into multiple dispersed flows through several homogeneous holes 310 on the surface of the hot melt cylinder 300.

[0043] Under the relative motion between the compression agitator 200 and the hot-melt cylinder 300, the PVC plastic material in the hot-melt state is subjected to shearing and diversion as it passes through the homogenization hole 310, and then re-merges under the agitation of the stirring shaft 230, thereby achieving homogenization of the material. Through the above-mentioned compression, heating, dispersion, and re-merging processes, PVC plastic particles with different properties or different initial states entering the cylinder 100 are fully mixed under hot-melt conditions to form a stable and uniform material flow.

[0044] Finally, the homogenized hot melt material is discharged from the outlet at the bottom of the barrel 100, and is used to connect with the subsequent extruder or molding equipment to complete the hot melt pretreatment process of PVC plastic particles.

[0045] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0046] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A pre-treatment mechanism for hot melting of PVC plastic particles, characterized in that, It includes a material cylinder (100), a compression stirring rod (200) and a hot melt cylinder (300) fixed inside the material cylinder (100). The compression stirring rod (200) is rotatably installed inside the material cylinder (100). The top of the material cylinder (100) is provided with a geared motor (120) for driving the compression stirring rod (200) to rotate. The compression agitator (200) includes a conical shaft (210), spiral blades (220) arranged on the surface of the conical shaft (210), and a stirring shaft (230) fixed to the bottom end of the conical shaft (210). The surface of the hot melt cylinder (300) is provided with several homogenizing holes (310), and several electric heating rings (320) are fixedly installed on the surface of the hot melt cylinder (300). Both the conical shaft (210) and the hot melt cylinder (300) are conical in shape, and the material is compressed and passes through the homogenizing holes (310) during the rotation of the compression agitator (200).

2. The pretreatment mechanism for hot melting of PVC plastic particles according to claim 1, characterized in that, The material cylinder (100) has a through hole on one side and a storage hopper (110) is fixedly connected thereto, which is used for the input of various PVC plastic particles.

3. The pretreatment mechanism for hot melting of PVC plastic particles according to claim 1, characterized in that, The bottom end of the barrel (100) is provided with a discharge port located at the center of the shaft for communication with the extruder.

4. The pretreatment mechanism for hot melting of PVC plastic particles according to claim 1, characterized in that, The diameter of the conical shaft (210) and the blade (220) gradually decreases at one end facing the hot melt cylinder (300), and the hot melt cylinder (300) has a conical structure and is tapered at the bottom.

5. A pretreatment mechanism for hot melting of PVC plastic particles according to claim 1, characterized in that, The surface of the stirring shaft (230) is provided with a plurality of stirring blades arranged in a spiral pattern, and the stirring shaft (230) is located below the hot melt cylinder (300) for stirring the material flow passing through the homogenizing hole (310).

6. A pretreatment mechanism for hot melting of PVC plastic particles according to claim 1, characterized in that, The hot melt cylinder (300) is a thermally conductive metal component, and several electric heating rings (320) are evenly distributed along the axial direction of the hot melt cylinder (300) to heat the hot melt cylinder (300).

7. A pretreatment mechanism for hot melting of PVC plastic particles according to claim 1, characterized in that, The homogeneous holes (310) are distributed in a matrix along the circumferential direction of the hot melt cylinder (300).

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