Plastic particle screening machine

Abstract

The utility model discloses a plastic particle screening machine which comprises a machine frame, a first-stage vibrating screen and a second-stage vibrating screen are installed and supported on the machine frame, a closed screening cavity is formed in the first-stage vibrating screen, a feeding port communicated with the screening cavity is formed in the top end of the first-stage vibrating screen, and an air distribution pipe is arranged in the screening cavity and located below the feeding port. A flat mouth air nozzle is arranged on the air distribution pipe in a communicating mode, a flexible air supply pipe is arranged on the outer side of the first-stage vibrating screen and communicates with the air distribution pipe, and the end of the flexible air supply pipe is connected with an air feeder; according to the plastic particle screening device, external air with relatively low temperature is conveyed into the screening cavity to form low-temperature airflow, plastic particles make contact with the fed low-temperature airflow to be cooled when being fed into the screening cavity from the feeding port, adhesion among the particles is prevented, meanwhile, the adhered particles can be blown away, and therefore the screening efficiency is improved; the reject ratio caused by particle adhesion is reduced, and the secondary processing burden of a particle production system is indirectly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic particle production tools, in particular to a screening machine for sorting plastic particles after they are formed. Background Art

[0002] The injection molding raw materials used to produce hoses include PVC granules, TPE granules, and TPU granules. The preparation of these granules requires mixing various powders and adding stabilizers, plasticizers, antioxidants, or dispersants in a specific ratio as additives. The resulting mixture undergoes processes such as heat activation, extrusion granulation, and pelletizing and packaging to form finished plastic granules. During the pelletizing and packaging process, the formed granules must first be sorted using a screening machine to obtain granules of the required size. Because the temperature of the mixed material is relatively high during the extrusion granulation process, the temperature of the plastic granules obtained through the pelletizing process is also relatively high, making them prone to adhesion. When these granules are directly transported to the screening machine for sorting, the adhered granules are easily separated and transported back to the extrusion granulation process for secondary processing, which not only reduces product production efficiency but also increases the burden of secondary processing. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a plastic particle screening machine which helps to quickly cool down plastic particles and reduce adhesion between particles caused by high temperature, thereby improving production efficiency and reducing the burden of secondary processing.

[0004] In order to solve the above technical problems, the technical solution of the utility model is: a plastic particle screening machine, comprising a frame, the frame is installed and supported with a first-level vibrating screen and a second-level vibrating screen from top to bottom, the first-level vibrating screen is connected to the second-level vibrating screen through a flexible feeding pipe, a closed screening chamber is provided in the first-level vibrating screen, a feed port connected to the screening chamber is provided at the top of the first-level vibrating screen, an air distribution pipe is provided below the feed port in the screening chamber, a flat air nozzle is arranged on the air distribution pipe, and each flat air nozzle extends toward the bottom of the feed port, a flexible air supply pipe is provided on the outside of the first-level vibrating screen, the flexible air supply pipe is connected to the air distribution pipe, and the end of the flexible air supply pipe is connected to a blower.

[0005] As a preferred technical solution, an air distribution cavity is formed on the inner wall corresponding to the first-level vibrating screen, the air distribution cavity and the screening cavity are separated by a cavity partition plate, air distribution holes are arranged through the cavity partition plate, and a material blocking mesh plate is provided on the side of the cavity partition plate facing the screening cavity, and the air distribution pipe is connected to the flexible air supply pipe through the air distribution cavity.

[0006] As a preferred technical solution, the air distribution pipe includes an air distribution main pipe connected to the air distribution cavity, and the air distribution main pipe is connected to layered air distribution branch pipes, and at least two of the flat-mouth nozzles are installed on each of the air distribution branch pipes.

[0007] As a preferred technical solution, the air distribution branch pipe is configured as an L-shaped elbow, one end of which is away from the air distribution main pipe and is supported on the partition plate. The air distribution branch pipe is layered on both sides of the air distribution main pipe and arranged in an up and down staggered manner.

[0008] As a preferred technical solution, the air distribution branch pipe is configured as a ring pipe, one side of the air distribution branch pipe is connected to the air distribution main pipe through a corresponding straight pipe, and the other side of the air distribution branch pipe is supported on the partition plate through a support arm.

[0009] As a preferred technical solution, the flat air nozzles on two adjacent air distribution pipes are staggered.

[0010] As an improvement to the above technical solution, the secondary vibrating screen is configured as a linear vibrating screen, the top portion of the secondary vibrating screen is covered with a material blocking cover, a feed hopper is provided through the material blocking cover, and the feed hopper is sealed and connected to the flexible feeding pipe.

[0011] Due to the adoption of the above technical solution, the plastic particle screening machine includes a frame, the frame is installed and supported with a first-level vibrating screen and a second-level vibrating screen from top to bottom, the first-level vibrating screen is connected to the second-level vibrating screen through a flexible feeding pipe, a closed screening chamber is provided in the first-level vibrating screen, a feed port connected to the screening chamber is provided at the top of the first-level vibrating screen, an air distribution pipe is provided below the feed port in the screening chamber, a flat air nozzle is arranged on the air distribution pipe, and each flat air nozzle is extended toward the bottom of the feed port, a flexible air supply pipe is provided on the outside of the first-level vibrating screen, and the flexible air supply pipe is provided. The flexible air supply pipe is connected to the air distribution pipe, and the end of the flexible air supply pipe is connected to the blower; the utility model has the following beneficial effects: through the cooperation of the blower, the flexible air supply pipe, the air distribution pipe and the flat-mouth nozzle, the relatively low-temperature air outside is transported to the screening chamber to form a low-temperature airflow, and when the plastic particles are fed into the screening chamber from the feed port, they are in contact with the low-temperature airflow to achieve cooling, so as to prevent adhesion between the particles, and at the same time, the particles that have been adhered can be blown away, thereby improving the screening efficiency, reducing the unqualified rate caused by particle adhesion, and indirectly reducing the secondary processing burden of the particle production system. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The following drawings are intended only to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0013] Figure 1It is a structural schematic diagram of an embodiment of the utility model;

[0014] Figure 2 This is a schematic cross-sectional view of the first-stage vibrating screen and related parts in an embodiment of the present invention;

[0015] Figure 3 This is a schematic diagram of a top view of a first-level vibrating screen and related parts in an embodiment of the present utility model;

[0016] Figure 4 This is another schematic diagram of a top view of a first-stage vibrating screen and related parts in an embodiment of the present invention;

[0017] Figure 5 This is a schematic diagram of a two-stage vibrating screen in a top view according to an embodiment of the present invention;

[0018] In the figure: 1-frame; 2-first-stage vibrating screen; 3-second-stage vibrating screen; 4-flexible feeding pipe; 5-screening chamber; 6-feeding port; 7-flat nozzle; 8-flexible air supply pipe; 9-air blower; 10-air distribution chamber; 11-cavity partition plate; 12-air distribution holes; 13-material blocking mesh plate; 14-air distribution main pipe; 15-air distribution branch pipe; 16-straight pipe; 17-support arm; 18-material blocking cover; 19-feeding hopper; 20-hopper cover. DETAILED DESCRIPTION

[0019] The present invention is further described below with reference to the accompanying drawings and examples. In the detailed description that follows, certain exemplary embodiments of the present invention are described by way of illustration only. It goes without saying that those skilled in the art will recognize that the described embodiments may be modified in various ways without departing from the spirit and scope of the present invention. Therefore, the drawings and description are illustrative in nature and are not intended to limit the scope of the claims.

[0020] like Figures 1 to 5 As shown, the plastic granule screening machine is used to screen the plastic granules that have been pelletized and transport the granules that meet the requirements to the packaging equipment for packaging. Specifically, it includes a frame 1, which is equipped with a primary vibrating screen 2 and a secondary vibrating screen 3 from top to bottom. The primary vibrating screen 2 is connected to the secondary vibrating screen 3 via a flexible feeding tube 4. The flexible feeding tube 4 is easy to deform and adapts to the relative position changes of the primary vibrating screen 2 and the secondary vibrating screen 3 during the screening operation, so that the plastic granules obtained by screening the primary vibrating screen 2 can be smoothly transferred to the secondary vibrating screen 3. The specific structure and working principle of the primary vibrating screen 2 and the secondary vibrating screen 3 are well known to ordinary technicians in this technical field and will not be described in detail here.

[0021] like Figure 2As shown, the first-stage vibrating screen 2 is provided with a closed screening chamber 5, and a feed port 6 connected to the screening chamber 5 is provided at the top of the first-stage vibrating screen 2. An air distribution pipe is provided below the feed port 6 in the screening chamber 5. The air distribution pipe is connected to a flat air nozzle 7, and each flat air nozzle 7 extends toward the bottom of the feed port 6. A flexible air supply pipe 8 is provided on the outside of the first-stage vibrating screen 2. The flexible air supply pipe 8 is connected to the air distribution pipe, and the end of the flexible air supply pipe 8 is connected to a blower 9. The blower 9 and the flexible air supply pipe 8 transport relatively low-temperature external air into the first-stage vibrating screen 2, and the air distribution pipe and the flat air nozzle 7 cooperate to form cold air, which is concentrated and distributed directly below the feed port 6. When plastic particles enter the screening chamber 5 through the feed port 6, they come into contact with the cold air during the downward process, which reduces the temperature of the plastic particles and allows the particles that stick together to be blown away. The flat air nozzle 7 has a wide air outlet and a small thickness, and cooperates with its installation angle to form an air curtain effect below the feed port 6, thereby increasing the cooling and blowing effect of the plastic particles.

[0022] In this embodiment, an air distribution cavity 10 is formed on the inner wall of the first-stage vibrating screen 2. The air distribution cavity 10 and the screening cavity 5 are separated by a cavity partition plate 11. That is, the cavity partition plate 11 is arranged corresponding to the inner wall of the first-stage vibrating screen 2, and the air distribution cavity 10 is formed between the two. Air distribution holes 12 are arranged through the cavity partition plate 11. In order to reduce the poor visual effect caused by too many lines in the view, Figure 2 、 Figure 3 and Figure 4 The air distribution holes 12 are not shown on the board surface of the cavity plate 11 drawn in the drawing. Figure 2 The cross section shows part of the air distribution holes 12. A material blocking mesh plate 13 is provided on the side of the partition plate 11 facing the screening chamber 5. The material blocking mesh plate 13 is used to intercept the air distribution holes 12 to prevent plastic particles from entering the air distribution chamber 10 when the blower 9 stops supplying air. The air distribution pipe is connected to the flexible air supply pipe 8 through the air distribution chamber 10. The flexible air supply pipe 8 sends external cold air into the air distribution chamber 10, and then blows it toward the screening chamber 5 through the cooperation of the air distribution chamber 10 and the air distribution holes 12. At the same time, it cooperates with the air distribution pipe to supply air to the outside through the flat air nozzle 7. When the air distribution holes 12 are used to supply air to the screening chamber 5, the plastic particles in the vibrating state in the cavity can be blown up to present a phenomenon similar to boiling, so that their temperature is further reduced and they are separated by adhesion.

[0023] like Figure 3 and Figure 4As shown, the air distribution pipe includes an air distribution main pipe 14 connected to the air distribution cavity 10, and the air distribution main pipe 14 is connected to the layered air distribution branch pipes 15, and at least two of the flat-mouth air nozzles 7 are respectively installed on the air distribution branch pipes 15. The staggered arrangement of the air distribution branch pipes 15 enables the flat-mouth air nozzles 7 to also form a staggered blowing effect, which not only helps to improve the cooling and dispersion effects, but also avoids obstruction or resistance to the escape of plastic particles after being blown away.

[0024] Specifically, the branch air distribution pipes 15 are configured as L-shaped elbows, with one end of the branch air distribution pipes 15 facing away from the main air distribution pipe 14 supported on the cavity plate 11. The branch air distribution pipes 15 are layered and staggered on both sides of the main air distribution pipe 14. For example, pipe sockets can be directly provided on the cavity plate 11, and the ends of the branch air distribution pipes 15 can be inserted into the sockets to secure them. To ensure effective air distribution, the supporting and securing ends of the branch air distribution pipes 15 can be closed.

[0025] Of course, the air distribution pipe 15 can also be set as follows Figure 4 As shown in the annular tube, one side of the air distribution branch pipe 15 is connected to the air distribution main pipe 14 through a corresponding straight pipe 16, and the other side of the air distribution branch pipe 15 is supported on the partition plate 11 through a support arm 17. In order to ensure the cooling and dispersion effect of the plastic particles, the flat-mouth nozzles 7 on the two adjacent air distribution branch pipes 15 are staggered.

[0026] In this embodiment, the secondary vibrating screen 3 is configured as a linear vibrating screen. Figure 5 As shown, the top portion of the secondary vibrating screen 3 is covered with a material blocking cover 18, and a feed hopper 19 is provided through the material blocking cover 18. A hopper cover plate 20 is provided on the top of the feed hopper 19, so that the feed hopper 19 is sealedly connected to the flexible feed pipe 4. When the flexible feed pipe 4 is used to transfer and transport particles to the secondary vibrating screen 3, they will be mixed with the cooling air sent into the screening chamber 5. The above design can prevent the particles from being carried to the outside of the secondary vibrating screen 3 by the diffusion of air, thereby ensuring that the particles can move smoothly within the secondary vibrating screen 3.

[0027] The description of the present invention is provided for purposes of illustration and description and is not intended to be exhaustive or to limit the invention to the disclosed form. Many modifications and variations will be apparent to those skilled in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for specific applications.

Claims

1. A plastic granule screening machine comprising a frame, wherein the frame is provided with a primary vibrating screen and a secondary vibrating screen mounted and supported from top to bottom, wherein the primary vibrating screen is connected to the secondary vibrating screen via a flexible feed pipe, and wherein: A closed screening chamber is provided in the first-level vibrating screen, a feed port connected to the screening chamber is provided at the top of the first-level vibrating screen, an air distribution pipe is provided in the screening chamber below the feed port, a flat air nozzle is arranged on the air distribution pipe, and each flat air nozzle extends toward the bottom of the feed port, a flexible air supply pipe is provided on the outside of the first-level vibrating screen, the flexible air supply pipe is connected to the air distribution pipe, and the end of the flexible air supply pipe is connected to the air supply pipe.

2. The plastic particle screening machine according to claim 1, characterized in that: An air distribution cavity is formed on the inner wall corresponding to the first-level vibrating screen. The air distribution cavity and the screening cavity are separated by a cavity partition plate. Air distribution holes are arranged through the cavity partition plate. A material blocking mesh plate is provided on the side of the cavity partition plate facing the screening cavity. The air distribution pipe is connected to the flexible air supply pipe through the air distribution cavity.

3. The plastic particle screening machine according to claim 2, characterized in that: The air distribution pipe includes an air distribution main pipe connected to the air distribution cavity, the air distribution main pipe is connected to layered air distribution branch pipes, and at least two flat-mouth air nozzles are respectively installed on the air distribution branch pipes.

4. The plastic particle screening machine according to claim 3, characterized in that: The air distribution branch pipe is configured as an L-shaped elbow, one end of the air distribution branch pipe away from the air distribution main pipe is supported on the cavity plate, and the air distribution branch pipe is layered on both sides of the air distribution main pipe and arranged in an up-and-down staggered manner.

5. The plastic particle screening machine according to claim 3, characterized in that: The air distribution branch pipe is configured as a ring pipe, one side of the air distribution branch pipe is connected to the air distribution main pipe through a corresponding straight pipe, and the other side of the air distribution branch pipe is supported on the partition plate through a support arm.

6. The plastic particle screening machine according to claim 5, characterized in that: The flat air nozzles on two adjacent air distribution pipes are staggered.

7. The plastic particle screening machine according to claim 1, characterized in that: The secondary vibrating screen is configured as a linear vibrating screen. The top portion of the secondary vibrating screen is covered with a material blocking cover. A feed hopper is provided through the material blocking cover. The feed hopper is sealed and connected to the flexible feeding pipe.

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