Injection molding device of plunger type injection molding machine

Abstract

The utility model discloses an injection molding device of a plunger type injection molding machine, which comprises a charging barrel and a hopper, the end part of the charging barrel is provided with a discharge port, a material pushing assembly for pushing materials to move to enable the materials to be discharged from the discharge port is arranged in the charging barrel, the discharge end of the hopper is mutually communicated with the interior of the charging barrel, the discharge end of the hopper is provided with a one-way valve, and the one-way valve is connected with the discharge port of the charging barrel. And a cover plate is arranged at the upper end of the hopper. The stirring device is reasonable in structural design, materials in the hopper can be stirred through the stirring assembly, heating melting of the materials can be accelerated, the melted raw materials enter the charging barrel after being filtered through the filter screen, impurities, gas, volatile matter and the like in the materials can be discharged, the product quality is guaranteed, and the production efficiency is improved. Materials are pushed out of the discharging opening through the material pushing assembly to be subjected to injection molding work, after injection molding work is completed, the interior of the hopper is conveniently cleaned, and the filtering frame is conveniently taken out to be cleaned or replaced.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding devices, in particular to an injection molding device of a plunger type injection molding machine. Background Art

[0002] An injection molding machine, also known as an injection molding machine or injection machine, is the primary molding equipment used to create various shapes of plastic products from thermoplastics or thermosetting plastics using plastic molding molds. Available in vertical, horizontal, and all-electric models, the injection molding machine heats the plastic and applies high pressure to the molten plastic, causing it to eject and fill the mold cavity. The operating principle of an injection molding machine is similar to that of a syringe: Using the thrust of a screw (or plunger), the plasticized, molten (i.e., viscous) plastic is injected into a closed mold cavity, where it solidifies and sets into shape to produce the final product.

[0003] Before processing, the plunger injection molding machine needs to stir and mix a variety of composite raw materials and then put them into the feeding port of the injection molding machine. When there are more materials, the materials are prone to uneven heating, which can easily cause incomplete melting of the plastic, and finally lead to an increase in the defective rate of the die. In addition, since the raw materials in the injection molding machine contain some impurities, and the volatiles generated by the evaporation of the raw materials during the melting process will be mixed with the molten raw materials, the surface of the plasticized finished product will often have various patterns such as bubbles, potholes and ripples, which affect the product quality. For this reason, we have designed an injection molding device for the plunger injection molding machine to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to solve the problems existing in the prior art, and to propose an injection molding device of a plunger-type injection molding machine, which can stir the material in the hopper through a stirring component, accelerate its melting under heat, and the melted raw material enters the barrel after being filtered through a filter screen, and can discharge impurities, gases and volatiles in the material to ensure product quality. The material can be pushed out from the discharge port for injection molding through a pushing component, and after the injection molding work is completed, it is convenient to clean the inside of the hopper and to take out the filter frame for cleaning or replacement.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A plunger-type injection molding machine injection device comprises a barrel and a hopper, wherein the end of the barrel is provided with a discharge port, and a pushing assembly is provided in the barrel for pushing the material to be discharged from the discharge port, the discharge end of the hopper is communicated with the interior of the barrel, a one-way valve is installed at the discharge end of the hopper, a cover plate is provided at the upper end of the hopper, and the hopper and the cover plate are connected by an adjusting assembly so that the cover plate can move up and down relative to the hopper, a filter assembly is provided in the hopper, a stirring assembly is provided on the cover plate extending into the hopper and connected to the filter assembly, and an air pump is installed on the cover plate.

[0007] Preferably, the pushing assembly includes a piston push plate sealed and slidably connected in the barrel, a hydraulic cylinder is installed at the end of the barrel, a plunger extending into the barrel is installed on the piston rod of the hydraulic cylinder, and the end of the plunger is fixedly connected to the piston push plate.

[0008] Preferably, a position sensor is installed in the barrel.

[0009] Preferably, the adjustment assembly includes two first connecting plates respectively fixedly connected to the side walls at both ends of the cover plate, and the side walls at both ends of the hopper are fixedly connected with a second connecting plate, wherein the first connecting plate and the second connecting plate opposite to each other on one side are connected by a telescopic rod, and a servo motor is installed on the upper end of the second connecting plate on the other side, and a threaded rod is fixedly connected to the end of the output shaft of the servo motor, and a threaded barrel is threadedly sleeved on the threaded rod, and the threaded barrel is fixedly connected to the bottom of the corresponding first connecting plate.

[0010] Preferably, the filter assembly includes a filter frame arranged in the hopper and abutting against its inner wall, a plurality of filter screens are installed through the filter frame, a plurality of limit rods are fixedly connected to the upper end of the filter frame, a plurality of slots are provided at the bottom of the cover plate, and the plurality of limit rods are respectively inserted and extended into the corresponding slots, and a cleaning brush is rotatably connected to the filter frame and abuts against the filter screen.

[0011] Preferably, the stirring assembly includes a driving motor installed on the upper end of the cover plate, and a stirring rod is installed at the end of the output shaft of the driving motor, which penetrates the cover plate and extends into the hopper. The side wall of the stirring rod is fixedly connected with multiple stirring blades, and the bottom of the stirring rod is connected to the cleaning brush by multiple screws.

[0012] Preferably, a transparent observation window is sealed and installed through the front side wall of the hopper.

[0013] Preferably, a heating chamber is provided in both the barrel and the hopper.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The injection molding device of this plunger injection molding machine adds raw materials into the hopper. The stirring component can stir the materials in the hopper to make them fully mixed and accelerate their melting under heat. The melted raw materials are filtered out of impurities through the filter and then enter the barrel. The pushing component pushes them out from the discharge port for injection molding. The cleaning brush rotates synchronously with the stirring rod to clean the filter to prevent it from clogging. The vacuum pump can extract the gas and volatiles in the hopper to ensure the smoothness of the surface of the injection molded parts and ensure product quality.

[0016] 2. After the injection molding work is completed, the injection molding device of the plunger type injection molding machine controls the cover to move upward to facilitate the cleaning of the inside of the hopper. The stirring rod and the cleaning brush are connected by screws to facilitate the separation of the stirring rod and the cleaning brush, thereby facilitating the removal of the filter frame for cleaning or replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of the injection device of the plunger-type injection molding machine proposed by the present invention from a first perspective;

[0018] Figure 2 This is a schematic diagram of the third perspective structure of the injection device of the plunger-type injection molding machine proposed by the present invention;

[0019] Figure 3 This is a schematic diagram of the main plan structure of an injection device of a plunger-type injection molding machine proposed in the present invention;

[0020] Figure 4 This is a schematic diagram of the internal structure of an injection molding device of a plunger-type injection molding machine proposed in the present invention;

[0021] Figure 5 for Figure 4 A magnified view of the structure at center A.

[0022] In the figure: 1. barrel; 2. hopper; 3. discharge port; 4. piston push plate; 5. hydraulic cylinder; 6. plunger; 7. position sensor; 8. one-way valve; 9. cover plate; 10. first connecting plate; 11. second connecting plate; 12. servo motor; 13. threaded rod; 14. telescopic rod; 15. filter frame; 16. limit rod; 17. cleaning brush; 18. drive motor; 19. stirring rod; 20. vacuum pump; 21. transparent observation window; 22. threaded barrel. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0024] Reference Figure 1-Figure 5 , an injection molding device of a plunger-type injection molding machine, comprising a barrel 1 and a hopper 2, a discharge port 3 being provided at the end of the barrel 1, a pushing assembly being provided in the barrel 1 for pushing the material to be discharged from the discharge port 3, the pushing assembly comprising a piston push plate 4 sealingly and slidingly connected in the barrel 1, a hydraulic cylinder 5 being installed at the end of the barrel 1, a plunger 6 extending into the barrel 1 being installed on the piston rod of the hydraulic cylinder 5, the end of the plunger 6 being fixedly connected to the piston push plate 4, the hydraulic cylinder 5 driving the plunger 6 to drive the piston push plate 4 to move, so that the falling molten raw material can be squeezed out from the discharge port 3, a position sensor 7 being installed in the barrel 1, the position sensor 7 being able to measure the distance moved by the piston push plate 4, and thus being able to measure the amount of material between the piston push plate 4 and the discharge port 3;

[0025] The discharge end of the hopper 2 is connected to the inside of the barrel 1. A one-way valve 8 is installed at the discharge end of the hopper 2, so that the material in the hopper 2 can be added to the barrel 1 to prevent the material in the barrel 1 from flowing back into the hopper 2. A cover plate 9 is provided at the upper end of the hopper 2, and a sealing rubber ring is provided at the bottom of the cover plate 9. When the cover plate 9 moves down and abuts against the upper end of the hopper 2, the sealing rubber ring can ensure the sealing between the cover plate 9 and the hopper 2. The hopper 2 and the cover plate 9 are connected by an adjusting component so that the cover plate 9 can move up and down relative to the hopper 2. The adjusting component includes two first connecting plates 10 respectively fixedly connected to the side walls at both ends of the cover plate 9. The side walls at both ends of the hopper 2 are fixedly connected A second connecting plate 11 is connected, wherein the first connecting plate 10 and the second connecting plate 11 opposite to each other on one side are connected by a telescopic rod 14. The telescopic rod 14 can guide the cover plate 9 when it is extended and retracted, so that the cover plate 9 can move up and down. A servo motor 12 is installed on the upper end of the second connecting plate 11 on the other side. The end of the output shaft of the servo motor 12 is fixedly connected to a threaded rod 13. A threaded barrel 22 is threadedly sleeved on the threaded rod 13. The threaded barrel 22 is fixedly connected to the bottom of the corresponding first connecting plate 10. The servo motor 12 drives the threaded rod 13 to rotate, and the threaded barrel 22 can drive the cover plate 9 to move up and down under the meshing action of the threaded rod 13 and the threaded barrel 22;

[0026] A filter assembly is provided in the hopper 2, and the filter assembly includes a filter frame 15 arranged in the hopper 2 and against its inner side wall. A plurality of filter screens are installed through the filter frame 15, and the filter screens can block impurities in the material and materials that are not fully melted. A plurality of limit rods 16 are fixedly connected to the upper end of the filter frame 15, and a plurality of slots are provided at the bottom of the cover plate 9. The plurality of limit rods 16 are respectively inserted and extended into the corresponding slots. The limit rods 16 extend into the corresponding slots to fix the filter frame 15, so that the filter frame 15 remains stationary and prevents the filter frame 15 from rotating with the cleaning brush 17. A cleaning brush 17 that is against the filter screen is rotatably connected to the filter frame 15, and the cleaning brush 17 can rotate relative to the filter frame 15 to clean the filter screen.

[0027] The cover plate 9 is provided with a stirring assembly extending into the hopper 2 and connected to the filter assembly. The stirring assembly includes a drive motor 18 installed at the upper end of the cover plate 9. The end of the output shaft of the drive motor 18 is provided with a stirring rod 19 that penetrates the cover plate 9 and extends into the hopper 2. The side wall of the stirring rod 19 is fixedly connected with a plurality of stirring blades. The drive motor 18 drives the stirring rod 19 and the stirring blades to rotate, which can stir the material in the hopper 2 so that it can be evenly heated and melted. The bottom of the stirring rod 19 is connected to the cleaning brush 17 by a plurality of screws. The bottom of the stirring rod 19 is provided with a flange, which is connected to the cleaning brush 17 by a plurality of screws so that the cleaning brush 17 can rotate synchronously with the stirring rod 19, and then the cleaning brush 17 can clean the filter to avoid clogging and allow the melted material to pass through the filter. An air pump 20 is installed on the cover plate 9. The air pump 20 can discharge the gas and volatiles in the hopper 2, which is beneficial to the injection molding work, can reduce the generation of bubbles in the injection molded parts, and ensure the quality of the injection molded parts.

[0028] A transparent observation window 21 is sealed and installed on the front side wall of the hopper 2. The setting of the transparent observation window 21 can check the material status and working conditions in the hopper 2. Both the barrel 1 and the hopper 2 are provided with a heating chamber, and an electric heating wire is installed in the heating chamber. Heating the hopper 2 can melt the material inside it, and heating the barrel 1 can prevent the material inside it from solidifying.

[0029] The functional principle of this utility model can be explained through the following operation modes:

[0030] In the present invention, when working, the servo motor 12 is started to drive the threaded rod 13 to rotate, so that the cover plate 9 moves upward away from the hopper 2, and the granular raw material is added to the hopper 2. The servo motor 12 is controlled to drive the threaded rod 13 to rotate in the opposite direction, so that the cover plate 9 is stably covered on the hopper 2. The heating chamber in the hopper 2 can heat the raw material to melt it. The drive motor 18 is started to drive the stirring rod 19 to rotate, so that the stirring rod 19 stirs the material in the hopper 2 to fully mix it and accelerate its melting by heat. The melted raw material enters the barrel 1, and the material that is not fully melted is filtered on the filter net. Continue to heat and melt, so that the material can be fully melted, and the filter can also filter the material to filter out impurities therein to ensure the quality of the material. The cleaning brush 17 rotates synchronously with the stirring rod 19, so that the cleaning brush 17 can clean the filter to prevent it from being blocked, so that the molten material can pass through the filter. Start the vacuum pump 20 to extract the gas and volatiles in the hopper 2, so that the molten raw material does not contain excessive volatiles, thereby preventing the volatiles from generating lines on the surface of the injection molded product during the injection molding process, thereby destroying the smoothness of the plastic part surface.

[0031] The melted raw material enters the barrel 1, and the hydraulic cylinder 5 drives the plunger 6 to drive the piston push plate 4 to move, so that the falling molten raw material is squeezed to the left end and squeezed out from the discharge port 3. The one-way valve 8 can control the opening and closing of the bottom of the hopper 2 to make the raw material fall regularly. The device has a simple structure, fast molding efficiency, uniform heating of the plastic, and guaranteed quality of the finished product. After the injection molding is completed, the control cover 9 moves upward to facilitate cleaning the inside of the hopper 2, and can facilitate separation of the stirring rod 19 and the cleaning brush 17, thereby facilitating the removal of the filter frame 15 for cleaning or replacement.

[0032] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An injection molding device of a plunger-type injection molding machine, comprising a barrel (1) and a hopper (2), characterized in that: The end of the barrel (1) is provided with a discharge port (3), and the barrel (1) is provided with a pushing assembly for pushing the material to move so that it is discharged from the discharge port (3). The discharge end of the hopper (2) is communicated with the interior of the barrel (1), and a one-way valve (8) is installed at the discharge end of the hopper (2). The upper end of the hopper (2) is provided with a cover plate (9), and the hopper (2) and the cover plate (9) are connected by an adjusting assembly so that the cover plate (9) can move up and down relative to the hopper (2). The hopper (2) is provided with a filter assembly, and the cover plate (9) is provided with a stirring assembly extending into the hopper (2) and connected to the filter assembly. The cover plate (9) is provided with an air pump (20).

2. The injection molding device of the plunger type injection molding machine according to claim 1, characterized in that: The pushing assembly comprises a piston push plate (4) sealed and slidably connected in the barrel (1); a hydraulic cylinder (5) is installed at the end of the barrel (1); a plunger (6) extending into the barrel (1) is installed on the piston rod of the hydraulic cylinder (5); and the end of the plunger (6) is fixedly connected to the piston push plate (4).

3. The injection molding device of a plunger type injection molding machine according to claim 1, characterized in that: A position sensor (7) is installed in the barrel (1).

4. The injection molding device of a plunger type injection molding machine according to claim 1, characterized in that: The adjustment assembly comprises two first connecting plates (10) respectively fixedly connected to the side walls at both ends of the cover plate (9), and the side walls at both ends of the hopper (2) are fixedly connected to the second connecting plates (11), wherein the first connecting plate (10) and the second connecting plate (11) on one side are connected by a telescopic rod (14), and a servo motor (12) is installed on the upper end of the second connecting plate (11) on the other side, and the output shaft end of the servo motor (12) is fixedly connected to a threaded rod (13), and a threaded sleeve (22) is threadedly provided on the threaded rod (13), and the threaded barrel (22) is fixedly connected to the bottom of the corresponding first connecting plate (10).

5. The injection molding device of the plunger type injection molding machine according to claim 1, characterized in that: The filter assembly includes a filter frame (15) arranged in the hopper (2) and abutting against the inner wall thereof, a plurality of filter screens are installed through the filter frame (15), a plurality of limit rods (16) are fixedly connected to the upper end of the filter frame (15), a plurality of slots are provided at the bottom of the cover plate (9), and the plurality of limit rods (16) are respectively inserted and extended into the corresponding slots, and a cleaning brush (17) is rotatably connected to the filter frame (15) and abutting against the filter screen.

6. The injection molding device of the plunger type injection molding machine according to claim 5, characterized in that: The stirring assembly comprises a driving motor (18) mounted on the upper end of the cover plate (9), a stirring rod (19) penetrating the cover plate (9) and extending into the hopper (2) is mounted at the end of the output shaft of the driving motor (18), a plurality of stirring blades are fixedly connected to the side wall of the stirring rod (19), and a bottom of the stirring rod (19) is connected to the cleaning brush (17) via a plurality of screws.

7. The injection molding device of a plunger type injection molding machine according to claim 1, characterized in that: A transparent observation window (21) is installed through and sealed on the front side wall of the hopper (2).

8. The injection molding device of a plunger type injection molding machine according to claim 1, characterized in that: A heating chamber is provided in both the barrel (1) and the hopper (2).

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