Plastic product injection molding device with heat preservation function

Abstract

The invention relates to the field of plastic injection molding, in particular to a plastic product injection molding device with a heat preservation function. A material storage tank is mounted on the feeding cylinder; the device further comprises a filter disc; a filter disc is arranged in the storage tank; the interior of the storage tank is divided into an upper space and a lower space by the filter disc; the plastic particles in the storage tank are subjected to size screening through the filter disc; a temperature control structure is arranged in the material storage tank, plastic particles in the material storage tank are heated through the temperature control structure, and molten plastic liquid in the material storage tank is injected into a forming mold through the feeding cylinder; when a first batch of plastic particles are melted, the purpose of quickly starting injection molding operation is achieved by screening the plastic particles with different sizes and carrying out regional targeted heating treatment, then the purpose of continuously feeding the plastic particles is achieved by utilizing a plugging structure of a filter disc and a scraper, and the overall injection molding process is accelerated.

Description

Technical Field

[0001] The invention relates to the field of plastic injection molding, in particular to a plastic product injection molding device with a heat preservation function. Background Art

[0002] Recycled plastic refers to the process of collecting, sorting, cleaning, crushing and melting discarded plastic products or plastic waste to reprocess them into reusable plastic materials. In order to reduce resource waste and environmental pollution, plastic is recycled and made into plastic pellets, which need to be molded into products again through an injection molding machine.

[0003] Injection molding machine, also known as injection molding machine or injection machine, is the main molding equipment for making plastic products of various shapes from thermoplastics or thermosetting plastics using plastic molding molds.

[0004] For example, Chinese patent CN218505071U discloses a plastic injection molding machine, which can effectively maintain the temperature in the plastic storage part by fitting the inner wall of the heating part to the outer wall of the plastic storage part. However, like the common injection molding machines in the prior art, it has the following defects: 1. Since plastic particles vary in size during the production process, and small plastic particles are mixed in large plastic particles, the melted small plastic particles are still attached to the large plastic particles and still occupy the heating space there, making it impossible to use the heating energy in a targeted manner.

[0005] 2. In the prior art, the entire internal space of the storage tank is usually insulated. However, the molten plastic liquid in the storage tank gradually decreases after multiple injection moldings, resulting in most of the space in the storage tank being vacant. However, these vacant spaces still consume a lot of insulation energy. Summary of the Invention

[0006] In order to overcome the shortcoming that the heating energy in the existing injection molding equipment cannot be used in a targeted manner, the present invention provides a plastic product injection molding device with a heat preservation function.

[0007] The technical solution of the present invention is: a plastic product injection molding device with a heat preservation function, comprising a feeding barrel and a storage tank; the storage tank is installed on the feeding barrel; and further comprising a filter disc; the filter disc is arranged in the storage tank; the filter disc divides the storage tank into two upper and lower spaces; the plastic particles in the storage tank are screened by size through the filter disc; a temperature control structure is arranged in the storage tank, and the plastic particles in the storage tank are heated by the temperature control structure to make the plastic particles become a molten state, and the molten plastic liquid in the storage tank is injected into the molding mold through the feeding barrel.

[0008] Furthermore, a vertical shaft is installed in the storage tank, and a rotating drive member is installed on the top of the storage tank; the driving end of the rotating drive member penetrates into the storage tank and is connected to the vertical shaft; a scraper is installed on the filter plate; the upper surface of the filter plate contacts the lower surface of the scraper; and the scraper is connected to the vertical shaft.

[0009] Furthermore, only half of the filter disc is provided with a screen, and the scraper is composed of a ring and a plate body. The plate body has the same shape and area as the screen. When the plate body rotates to cover the screen, the filter disc and the scraper form a sealing structure to isolate the upper and lower spaces of the storage tank.

[0010] Furthermore, a feed port is provided on the top of the storage tank, and the feed port is located on the side close to the top of the screen.

[0011] Furthermore, an internal spline is provided in the collar, and an external spline is provided on the vertical shaft, and the internal spline of the collar cooperates with the external spline of the vertical shaft to form a spline connection; two movable driving members are installed on the storage tank, and the driving ends of the two movable driving members penetrate into the storage tank and are jointly connected to the filter plate.

[0012] Furthermore, the moving drive member is a multi-stage electric drive push rod.

[0013] Furthermore, the outer edge of the filter disc contacts the inner wall of the storage tank.

[0014] Furthermore, the temperature control structure is composed of a plurality of vertical arrays of heating components.

[0015] Furthermore, the heating component is a heating ring, and the heating ring is built into the inner wall of the storage tank.

[0016] Furthermore, the surfaces of the filter disc and the scraper are coated with a heat-insulating coating.

[0017] The beneficial effect is that the present invention realizes that when melting the first batch of plastic particles, the plastic particles of different sizes are screened and targeted heating treatment is performed in different areas, so as to achieve the purpose of quickly starting the injection molding operation, and then the sealing structure of the filter plate and the scraper is used to achieve the purpose of continuous feeding of plastic particles, thereby accelerating the overall injection molding process.

[0018] The present invention adjusts the size of the space below the filter disc according to the inventory of the molten plastic liquid in the storage tank, cooperates with the heat insulation layer formed by the sealing structure composed of the filter disc and the scraper, and the adaptive heating of the heating ring, so as to achieve the purpose of adaptively adjusting the insulation space according to the inventory of the molten plastic liquid, thereby reducing energy waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1Shown is a schematic diagram of the three-dimensional structure of the plastic product injection molding device with heat preservation function of the present invention; Figure 2 What is shown is a schematic diagram of the internal three-dimensional structure of the storage tank of the present invention; Figure 3 Shown is a schematic diagram of the combined three-dimensional structure of the filter disc and scraper of the present invention; Figure 4 Shown is a state transition diagram of the filter disc and scraper combination of the present invention; Figure 5 Shown is an exploded view of the filter disc and scraper combination of the present invention.

[0020] The names and serial numbers of the parts in the figure are: 1-feeding barrel, 2-storage tank, 3-filter plate, 31-screen, 4-scraper, 41-ring, 42-plate body, 5-vertical shaft, 6-rotating drive member, 7-moving drive member, 8-heating ring, 9-feed port. DETAILED DESCRIPTION

[0021] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Example 1: A plastic product injection molding device with heat preservation function, such as Figure 1-Figure 5 As shown, it includes a feeding cylinder 1 and a storage tank 2; the storage tank 2 is installed on the feeding cylinder 1; the feeding cylinder 1 and the storage tank 2 are connected through a pipeline with a solenoid valve; it also includes a filter disc 3; the filter disc 3 is arranged in the storage tank 2; the filter disc 3 divides the storage tank 2 into two upper and lower spaces; a temperature control structure is arranged in the storage tank 2.

[0023] A vertical shaft 5 is installed in the storage tank 2, and a rotating drive member 6 is installed on the top of the storage tank 2, and the rotating drive member 6 is a motor; the driving end of the rotating drive member 6 penetrates into the storage tank 2 and is connected to the vertical shaft 5; a scraper 4 is installed on the filter disc 3; the upper surface of the filter disc 3 contacts the lower surface of the scraper 4; the scraper 4 is connected to the vertical shaft 5.

[0024] Only half of the filter disc 3 is provided with the screen 31 . The scraper 4 is composed of a collar 41 and a plate 42 . The plate 42 has the same shape and area as the screen 31 .

[0025] A feed port 9 is provided on the top of the storage tank 2 , and the feed port 9 is located on a side close to the top of the screen 31 .

[0026] The end of the feeding barrel 1 is connected to the forming mold, and the feeding barrel 1 has a built-in conveying structure for the molten plastic liquid (not shown in the figure).

[0027] In this embodiment, plastic particles made of recycled plastic are prepared, and the feed port 9 is connected to the external feed pipe. The plastic particles are first transported into the storage tank 2 through the feed port 9. Since the plastic particles are of different sizes during the production process, and small plastic particles are mixed in the large plastic particles, the melted small plastic particles are still attached to the large plastic particles and still occupy the heating space there, making it impossible to use the heating energy in a targeted manner. Therefore, in the present invention, the added plastic particles are screened by designing the filter disk 3, so that the large plastic particles stay in the space above the filter disk 3, while the small plastic particles pass through the filter disk 3 and fall into the filter disk 3. The space below is used to place plastic particles of different sizes in different areas. After the feeding is completed, the feed port 9 is closed, and then the temperature control structure in the storage tank 2 is started to heat and melt the plastic particles. Since small plastic particles melt earlier than large plastic particles, when the small plastic particles in the space below are melted, the temperature control structure in the storage tank 2 can be controlled to adjust the temperature of the space below to keep it warm. There is no need to maintain a high temperature environment in the space below. In this way, the large plastic particles in the space above can be heated at high temperature to improve the utilization rate of heat energy. After the large plastic particles are melted, they pass through the filter disc 3 and enter the space below.

[0028] When all the plastic particles in the storage tank 2 have turned into molten liquid, the pipe between the feeding barrel 1 and the storage tank 2 is controlled to open, so that the molten plastic liquid enters the feeding barrel 1, and the molten plastic liquid is injected into the molding mold through the conveying structure built into the feeding barrel 1.

[0029] Furthermore, when the plastic particles are screened through the filter disc 3, in order to prevent large plastic particles from clogging the mesh, the vertical shaft 5 and the scraper 4 are driven to rotate by the rotating drive member 6, so that the plastic particles are moved by the scraper 4, so that the large plastic particles will not clog the mesh, thereby ensuring normal screening of the plastic particles.

[0030] Furthermore, in the prior art, when new plastic particles need to be added for melting later, it is necessary to wait until all the molten plastic liquid in the storage tank 2 is injected, which makes it impossible to achieve continuous injection molding, that is, the next batch of plastic particles can be heated and melted only after this batch of plastic particles has been used up, and the waiting time is long. Therefore, in the present invention, the filter disc 3 is designed to have a structure with a screen 31 in only half of its area, and the screen 31 is used for normal filtering processing, and the feed port 9 is set on the side close to the top of the screen 31, so that the plastic particles are concentrated and fall to the position of the screen 31 for filtering, and the rotation of the scraper 4 can also move the plastic particles at the screen 31; after all the plastic particles in this batch have become molten for injection molding, when the height of the molten plastic liquid in the storage tank 2 is lower than the filter disc 3, the vertical shaft 5 and the scraper 4 are driven to rotate by the rotating drive member 6, so that the plate body 42 of the scraper 4 rotates to cover the screen 31. At this time, the filter disc 3 and the scraper 4 form a blocking structure, as shown in FIG. Figure 4 As shown, the upper and lower spaces of the storage tank 2 are separated. At this time, the lower space of the storage tank 2 stores the molten plastic liquid in use, and the upper space of the storage tank 2 is empty. Then the feed port 9 can be opened to allow the next batch of plastic particles to enter the upper space of the storage tank 2 from the feed port 9. At this time, the temperature of the upper and lower spaces of the storage tank 2 is controlled by the temperature control structure. The lower space of the storage tank 2 is the molten plastic liquid in use, so the lower space only needs to be in an insulation state, and the upper space of the storage tank 2 is the newly added plastic particles, so the upper space needs to be in a high-temperature heating state. When the molten plastic liquid in the lower space is completely used up, the vertical shaft 5 and the scraper 4 are driven to rotate by the rotating drive member 6, so that the plate body 42 of the scraper 4 no longer covers the screen 31, so that the newly added plastic particles in the upper space fall downward, so that the next batch of plastic particles can be preheated in advance, and even some or all of the plastic particles have melted. If the newly added plastic particles have not completely melted when the plate body 42 is rotated open, the aforementioned regional heating treatment operation is repeated.

[0031] In this way, when melting the first batch of plastic particles, the plastic particles of different sizes are screened and targeted heating treatment is performed in different areas, so as to achieve the purpose of quickly starting the injection molding operation. Then, the sealing structure of the filter plate 3 and the scraper 4 is used to achieve the purpose of continuous feeding of plastic particles, thereby accelerating the overall injection molding process.

[0032] Example 2: Based on Example 1, Figure 1-Figure 5 As shown, an internal spline is provided in the collar 41, and an external spline is provided on the vertical shaft 5. The internal spline of the collar 41 cooperates with the external spline of the vertical shaft 5 to form a spline connection; two movable driving members 7 are installed on the storage tank 2, and the driving ends of the two movable driving members 7 penetrate into the storage tank 2 and are jointly connected to the filter plate 3.

[0033] The moving driving member 7 is a multi-stage electric drive push rod.

[0034] The outer edge of the filter disc 3 contacts the inner wall of the storage tank 2 .

[0035] The temperature control structure is composed of a plurality of vertical array heating components.

[0036] The heating component is a heating ring 8 , which is built into the inner wall of the storage tank 2 . Seven heating rings 8 are exemplarily shown in the figure.

[0037] The surfaces of the filter disc 3 and the scraper 4 are both coated with a heat-insulating coating.

[0038] In this embodiment, the aforementioned upper and lower zone heating operation is achieved by means of seven heating rings 8 in a vertical array, and the filter disc 3 and the scraper 4 are designed as a movable structure, that is, the filter disc 3 and the scraper 4 can be pushed up and down by controlling the movable driving member 7, and the scraper 4 is spline-connected to the vertical shaft 5, so that the scraper 4 can both move and rotate.

[0039] Since the storage tank 2 stores molten plastic liquid, the molten plastic liquid needs to be insulated, that is, the storage tank 2 needs to be kept at a constant temperature. However, in the prior art, the entire internal space of the storage tank 2 is usually insulated, and the molten plastic liquid in the storage tank 2 gradually becomes less after multiple injection moldings, resulting in most of the space in the storage tank 2 being vacant. However, these vacant spaces still consume a lot of insulation energy. Therefore, in the present invention, the surfaces of the filter disc 3 and the scraper 4 are designed to be coated with a heat-insulating coating. After the molten plastic liquid in the storage tank 2 is lower than the filter disc 3, the control plate body 42 rotates to form a blocking structure with the filter disc 3 and the scraper 4. At this time, only the space below the filter disc 3 is controlled. The square heating ring 8 generates heat and keeps warm. At the same time, a heat insulation layer is formed by the sealing structure composed of the filter disc 3 and the scraper 4, which reduces the heat dissipation upward in the space below the filter disc 3. In the process of gradually reducing the use of the molten plastic liquid in the storage tank 2, the filter disc 3 and the scraper 4 are controlled to move downward, thereby reducing the space below the filter disc 3, and the heating ring 8 above the filter disc 3 is controlled to stop heating, so as to adjust the size of the space below the filter disc 3 according to the stock of the molten plastic liquid in the storage tank 2. The heat insulation layer formed by the sealing structure composed of the filter disc 3 and the scraper 4 and the adaptive heating of the heating ring 8 can achieve the purpose of adaptively adjusting the insulation space according to the stock of the molten plastic liquid, so as to reduce energy waste.

[0040] In this embodiment, only after the amount of molten plastic liquid in the space below the filter disc 3 reaches the minimum range value, the operation of adding the next batch of plastic particles in Example 1 is performed, so that the capacity of the space above the filter disc 3 reaches the maximum value at this time, so that more plastic particles can be added in the next batch.

[0041] It should be noted that during the movement of the filter disc 3 and the scraper 4, the plate body 42 does not cover the screen 31. When the filter disc 3 and the scraper 4 move to the desired position, the plate body 42 is controlled to cover the screen 31 to form a blocking structure to ensure the normal movement of the filter disc 3 and the scraper 4.

[0042] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A plastic product injection molding device, comprising a feeding cylinder (1) and a storage tank (2); the storage tank (2) is mounted on the feeding cylinder (1); characterized in that: The invention also includes a filter disc (3); the filter disc (3) is provided in the storage tank (2); the filter disc (3) divides the storage tank (2) into two upper and lower spaces; the plastic particles in the storage tank (2) are screened by size through the filter disc (3); a temperature control structure is provided in the storage tank (2), and the plastic particles in the storage tank (2) are heated by the temperature control structure to make the plastic particles become a molten state, and the molten plastic liquid in the storage tank (2) is injected into the molding mold through the feeding barrel (1).

2. A plastic product injection molding device according to claim 1, characterized in that: A vertical shaft (5) is installed in the storage tank (2), and a rotary drive member (6) is installed on the top of the storage tank (2); the driving end of the rotary drive member (6) penetrates into the storage tank (2) and is connected to the vertical shaft (5); a scraper (4) is installed on the filter disc (3); the upper surface of the filter disc (3) contacts the lower surface of the scraper (4); and the scraper (4) is connected to the vertical shaft (5).

3. The plastic product injection molding device according to claim 2, characterized in that: Only half of the filter disc (3) is provided with a screen (31). The scraper (4) is composed of a collar (41) and a plate (42). The plate (42) has the same shape and area as the screen (31). When the plate (42) rotates to cover the screen (31), the filter disc (3) and the scraper (4) form a blocking structure, isolating the upper and lower spaces of the storage tank (2).

4. The plastic product injection molding device according to claim 3, characterized in that: A feed port (9) is provided on the top of the storage tank (2), and the feed port (9) is located on a side close to the top of the screen (31).

5. The plastic product injection molding device according to claim 3, characterized in that: An internal spline is provided in the collar (41), and an external spline is provided on the vertical shaft (5), and the internal spline of the collar (41) cooperates with the external spline of the vertical shaft (5) to form a spline connection; two movable drive members (7) are installed on the storage tank (2), and the driving ends of the two movable drive members (7) penetrate into the storage tank (2) and are connected to the filter disc (3) together.

6. The plastic product injection molding device according to claim 5, characterized in that: The mobile driving member (7) is a multi-stage electric drive push rod.

7. The plastic product injection molding device according to claim 5, characterized in that: The outer edge of the filter disc (3) contacts the inner wall of the storage tank (2).

8. The plastic product injection molding device according to claim 5, characterized in that: The temperature control structure is composed of a plurality of vertical array heating components.

9. The plastic product injection molding device according to claim 8, characterized in that: The heating component is a heating ring (8), and the heating ring (8) is built into the inner wall of the storage tank (2).

10. A plastic product injection molding device according to claim 8 or 9, characterized in that: The surfaces of the filter disc (3) and the scraper (4) are both coated with a heat-insulating coating.

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