An injection molding machine

Abstract

The application discloses an injection molding machine and belongs to the field of battery shell injection molding, which comprises a feeding box, an extruding device connected with the feeding box, and an opening and closing mold driving device for controlling the opening and closing of a mold, wherein the mold comprises a fixed mold and a movable mold, the opening and closing mold driving device comprises a movable seat connected with the movable mold and a driving structure for pushing the movable mold, the bottom of the movable seat is installed on an opening and closing mold sliding rail, and the driving structure comprises two driving lead screws, so that the movement of the movable mold is more stable and is not prone to shaking, thereby improving the stability of mold opening and closing, and solving the problems of poor stability of mold opening and closing, reduced production efficiency of a flow line and a large number of defective products in the prior art.

Description

An injection molding machine Technical Field

[0001] This invention relates to the field of injection molding of battery casings, and in particular to an injection molding machine. Background Technology

[0002] With technological advancements, traditional manufacturing industries are striving to increase equipment automation to enhance production efficiency. In past battery casing production lines, after injection molding, batteries were manually transported to subsequent workstations for further processing steps, such as surface inspection and plastic film packaging. These subsequent workstations were also largely manual, resulting in low production efficiency. Current technology, aiming to improve efficiency, integrates various workstations into automated production lines, replacing manual tasks with automated equipment. While this increases efficiency, it also increases the interconnectivity between workstations, especially upstream stations like the injection molding station in battery casing production. Errors in these upstream stations can cause downstream stations to halt production, impacting the overall efficiency of the production line.

[0003] Before and after the injection molding process, mold opening and closing are required to remove the molded product. However, existing injection molding machines have poor stability in mold opening and closing, and are prone to jamming and shutdown. Once the injection molding machine stops, downstream stations will also stop production, thus affecting the efficiency of the entire production line. Furthermore, if a deviation occurs during mold closing, the shape of the flow channel for the raw material entering the molding cavity will change, thereby affecting the quality of the molded product.

[0004] For example, the Chinese patent document "An Injection Molding Machine and a Control Method for the Injection Molding Machine," with publication number CN112223699A, discloses an injection molding machine and a mold mechanism mounted on the top outer wall of the worktable. A control module is located inside the worktable. The mold mechanism includes a moving injection mold and a fixed injection mold, with one inner wall of the fixed injection mold connected to the output end of the injection molding mechanism. The control method for this injection molding machine includes the following steps: the injection molding mechanism extrudes material into the mold core; a timer synchronizes the extrusion process; and an electrically controlled temperature-controlled liquid tank maintains the temperature through a first and second temperature-controlled pipe. The drawback of this patent is that it uses a hydraulic cylinder to drive the mold opening and closing, resulting in poor stability, especially during mold closing, which is prone to jamming. This affects the efficiency of the entire production line and may also cause changes in the flow channel shape of the raw material entering the molding cavity, thus affecting the quality of the molded product. Summary of the Invention

[0005] The present invention aims to overcome the problem that the poor stability of the mold opening and closing process in the prior art leads to reduced production efficiency and a high number of defective products. It provides an injection molding machine that can improve the stability of the mold opening and closing process and avoid affecting production efficiency and product quality.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This invention discloses an injection molding machine, comprising a feed box, an extrusion device connected to the feed box, and a mold opening and closing drive device for controlling the opening and closing of a mold. The mold includes a fixed mold and a movable mold. The mold opening and closing drive device includes a movable seat connected to the movable mold and a drive structure for pushing the movable mold. The bottom of the movable seat is mounted on a mold opening and closing slide rail. The drive structure includes two drive screws. Drive sliders adapted to the drive screws are mounted on both sides of the movable mold.

[0008] In this solution, a drive screw replaces the hydraulic cylinder in the existing technology, making the movement of the moving mold more stable and less prone to vibration, thereby improving the stability of mold opening and closing. Since there are two drive screws, each driving one side of the moving mold, horizontal rotational deviation of the moving mold can be prevented. Furthermore, the presence of the moving base and guide rails allows for further limiting of the moving mold's path at different heights relative to the drive screws, preventing vertical rotational deviation. These two different directional limits ensure that the moving mold's direction of movement does not deviate, preventing jamming and impacting production efficiency.

[0009] Preferably, the mold opening and closing drive device further includes a guide structure, which includes guide rods. The guide rods include an upper guide rod installed above the drive screw and a lower guide rod installed below the drive screw. The guide rods are connected to the fixed mold via a fixed mold bearing seat and to the movable mold via a movable mold bearing seat. The upper and lower guide rods can prevent the fixed mold and the movable mold from shifting relative to each other in the vertical rotation direction. The presence of two upper guide rods or two lower guide rods corresponding to the two guide rods can prevent the fixed mold and the movable mold from shifting relative to each other in the horizontal rotation direction. The above structure ensures the reliability of the relative position of the fixed mold and the movable mold, thereby preventing changes in the flow channel shape of the raw material entering the molding cavity, which would affect the quality of the molded product.

[0010] Preferably, the drive structure further includes a drive motor and a drive wheel mounted on the drive motor. A transmission wheel is also mounted on the drive shaft, and the drive wheel and the transmission wheel are connected by a synchronous belt.

[0011] Preferably, the drive structure further includes a tensioner, which includes a tensioning pulley for abutting the timing belt; the tensioning pulley can prevent the timing belt from becoming loose.

[0012] Preferably, the fixed mold and the movable mold are respectively equipped with positioning pins and positioning pin holes that are adapted to the positioning pins. The relative position of the fixed mold and the movable mold after mold closing can be improved by the cooperation of the positioning pins and the positioning pin holes.

[0013] Preferably, the extrusion device includes an extrusion tube fixedly connected to the feed box, an extrusion shaft with a spiral groove on the outside installed inside the extrusion tube, an extrusion channel is formed between the extrusion shaft and the extrusion tube, an extrusion head is installed on the side of the extrusion tube facing the fixed mold, and an extrusion drive device for driving the extrusion shaft to rotate is installed on the side of the extrusion tube facing away from the fixed mold; after the extrusion shaft rotates, its spiral groove can squeeze the raw material in the extrusion tube toward the fixed mold and send it into the fixed mold through the extrusion head.

[0014] Preferably, the extrusion tube is fitted with several heating rings, and the heating rings are fitted with heat insulation sleeves. The heat insulation sleeves have wiring openings on their lower sides. The heating rings are used to ensure the temperature inside the extrusion tube and to keep the raw material in a molten state inside the extrusion tube.

[0015] Preferably, the movable mold has several forming cavities, and the fixed mold has a flow-dividing cavity. The forming cavities are connected to the flow-dividing cavity through a flow-dividing channel, and a cutting opening is formed between the flow-dividing channel and the forming cavity. In this solution, after forming, only the waste material in the flow-dividing cavity needs to be removed, allowing the sprues of multiple battery casings to be cut off simultaneously, eliminating the need to cut the sprues of each battery casing separately, thus greatly improving production efficiency. Since the flow-dividing cavity is located within the fixed mold, after forming, the movable mold separates from the fixed mold, and the waste material formed in the flow-dividing cavity is also carried out with the movable mold and located outside the movable mold, making it easy to remove the waste material from the flow-dividing cavity.

[0016] Preferably, the second flow divider forming structure includes a sprue turntable with a flow divider channel forming groove for forming a flow divider channel. The injection molding machine structure also includes a sprue drive structure for driving the sprue turntable to rotate. In this solution, after molding, a portion of the flow divider waste material is located in the flow divider channel forming groove. When the sprue turntable rotates, the sidewall of the flow divider channel forming groove generates a tangential force on this portion of the flow divider waste material, thereby simultaneously cutting off the flow divider waste material at several cutting points, preventing the sprue turntable from spinning idly.

[0017] Therefore, the present invention has the following beneficial effects: (1) It can ensure that the moving direction of the moving mold will not deviate, thus avoiding the situation where it gets stuck and affects production efficiency; (2) It can ensure the reliability of the relative position of the fixed mold and the moving mold, thereby avoiding the situation where the flow channel shape of the raw material entering the molding cavity changes, thus affecting the quality of the product after molding; (3) It can simultaneously mold multiple battery housings in one injection molding process, thereby improving production efficiency; (4) It can quickly cut the gates of multiple battery housings, thereby further improving production efficiency. Attached Figure Description

[0018] Figure 1 is a schematic diagram of an overall structure of this application.

[0019] Figure 2 is a schematic diagram of one structure of the mold opening and closing drive device of this application.

[0020] Figure 3 is a schematic diagram of a left-side view of the driving structure of this application.

[0021] Figure 4 is a schematic diagram of a right-view structure of the driving structure of this application.

[0022] Figure 5 is a schematic diagram of one structure of the extrusion device of this application.

[0023] Figure 6 is a schematic diagram of a structure of the injection mold in this application.

[0024] Figure 7 is a side view of one of the moving modules of this application.

[0025] Figure 8 is a side view of one type of fixed mold structure of this application.

[0026] Figure 9 is a partial enlarged view of the first and second cut-out trigger structures of this application in Figure 1.

[0027] Figure 10 is a partial enlarged view of the shunt cavity in Figure 6.

[0028] In the diagram: 1. Feed box; 2. Extrusion device; 3. Mold opening and closing drive device; 4. Fixed mold; 5. Moving mold; 6. Moving seat; 7. Mold opening and closing slide rail; 8. Drive screw; 9. Drive slider; 10. Upper guide rod; 11. Lower guide rod; 12. Fixed mold bearing seat; 13. Moving mold bearing seat; 14. Drive motor; 15. Drive wheel; 16. Transmission wheel; 17. Synchronous belt; 18. Extrusion tube; 19. Extrusion shaft; 20. Extrusion head; 21. Extrusion drive device. 2. Heating ring 23, heat insulation sleeve 24, wiring opening 25, flow divider 26, forming cavity 27, flow divider channel 28, cutting port 29, water cutter turntable 30, forming groove 31, forming protrusion 32, water cutter shaft 33, shaft through hole 34, extrusion protrusion 35, elastic ring 36, worm gear 37, worm 38, first transmission wheel 39, second transmission wheel 40, positioning pin 41, positioning pin hole 42, recovery box 43, tensioning wheel. Detailed Implementation

[0029] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0030] In the embodiments shown in Figures 1-10, an injection molding machine includes a feed box 1, an extrusion device 2 connected to the feed box, and an opening and closing mold drive device 3 for controlling the opening and closing of the mold. The mold includes a fixed mold 4 and a movable mold 5.

[0031] The mold opening and closing drive device includes a movable base 6 connected to the movable mold, and a drive structure for pushing the movable mold. The bottom of the movable base is mounted on the mold opening and closing slide rail 7. The drive structure includes two drive screws 8, and drive sliders 9 adapted to the drive screws are mounted on both sides of the movable mold. The mold opening and closing drive device also includes a guide structure, which includes guide rods. The guide rods include an upper guide rod 10 mounted above the drive screws and a lower guide rod 11 mounted below the drive screws. The guide rods are connected to the fixed mold via a fixed mold bearing seat 12 and to the movable mold via a movable mold bearing seat 13.

[0032] The drive structure also includes two drive motors 14, each equipped with a drive wheel 15. A transmission wheel 16 is also mounted on the drive shaft. The drive wheels and transmission wheels are connected by a synchronous belt 17. The drive motor is a servo motor. The drive structure also includes a tensioner, which includes a tensioning wheel 43 for abutting against the synchronous belt.

[0033] The extrusion device includes an extrusion tube 18 fixedly connected to the feed box. An extrusion shaft 19 with a spiral groove on the outside is installed inside the extrusion tube, forming an extrusion channel between the extrusion shaft and the extrusion tube. An extrusion head 20 is installed on the side of the extrusion tube facing the fixed mold, and an extrusion drive device 21 for driving the extrusion shaft to rotate is installed on the side of the extrusion tube facing away from the fixed mold. Several heating rings 22 are sleeved on the outside of the extrusion tube, and a heat insulation sleeve 23 is sleeved on the outside of the heating rings. A wiring opening 24 is provided on the lower side of the heat insulation sleeve.

[0034] When the mold is closed, it has a flow divider cavity 25 and several molding cavities 26 inside. The molding cavities are arranged circumferentially around the flow divider cavity. In this embodiment, six molding cavities are evenly distributed circumferentially around the flow divider cavity. The flow divider cavity is connected to the injection channel, and the molding cavities are connected to the flow divider cavity through the flow divider channel 27. A cutting port 28 is formed between the flow divider channel and the molding cavity. The fixed mold has a first flow divider cavity molding structure, and the movable mold includes a product molding structure and a second flow divider cavity molding structure. The gap between the first flow divider cavity molding structure and the second flow divider cavity molding structure is the flow divider cavity.

[0035] The second diversion cavity forming structure includes a water-cutting turntable 29, which is provided with diversion channel forming grooves 30 evenly distributed circumferentially for forming diversion channels. The first diversion cavity forming structure includes a diversion channel forming protrusion 31 partially located within the diversion channel forming groove.

[0036] A sprue-cutting turntable is also connected to a sprue-cutting shaft 32. The product forming structure has a shaft through-hole 33, the diameter of which is larger than the outer diameter of the sprue-cutting shaft and smaller than the outer diameter of the sprue-cutting turntable. An elastic structure is installed between the sprue-cutting turntable and the sprue-cutting shaft. A pressing protrusion 34 is provided within the fixed mold to abut against the sprue-cutting turntable. In the mold-closed state, the elastic structure is compressed, and the sprue-cutting turntable abuts against the product forming structure. In the mold-open state, the elastic structure relaxes, and the sprue-cutting turntable separates from the product forming structure. In this embodiment, the elastic structure is an elastic ring 35, with the sprue-cutting turntable and the sprue-cutting shaft fixed to its two sides respectively. In other equivalent embodiments, the elastic structure can also be a combination of a spring and a shaft hole, etc.

[0037] The injection molding machine structure also includes a sprue drive structure for driving the sprue turntable to rotate. The sprue drive structure includes a first sprue trigger structure fixedly mounted on the frame and a second sprue trigger structure mounted on a movable base. When the movable base moves, the first sprue trigger structure triggers the second sprue trigger structure, causing the sprue shaft to drive the sprue turntable to rotate. The first sprue trigger structure includes a worm gear 36, and the second sprue trigger structure includes a worm 37 adapted to the worm gear. A first transmission wheel 38 is mounted at one end of the worm, and a second transmission wheel 39, which rotates synchronously with the first transmission wheel, is mounted at one end of the sprue shaft.

[0038] The movable mold is also provided with a positioning pin 40, and the fixed mold is provided with a positioning pin hole 41 that is adapted to the positioning pin.

[0039] The frame is also equipped with a recycling bin 42 for receiving waste from the diversion chamber.

[0040] The molding and injection process of the device is as follows: When the drive motor rotates in the forward direction, the two drive wheels drive the transmission wheel to rotate through the synchronous belt, which in turn drives the two drive screws to rotate synchronously. The two drive sliders move at the same speed, thereby driving the moving mold towards the fixed mold for mold closing. During the mold closing process, the positioning pin is inserted into the positioning pin hole. After mold closing, a flow divider cavity is formed between the first flow divider cavity forming structure and the second flow divider cavity forming structure, and a forming cavity is formed between the fixed mold and the product forming structure. Then, the extrusion drive device drives the spiral structure in the extrusion channel to rotate, thereby extruding the raw material through the injection head into the flow divider cavity. After the flow divider cavity is filled, the raw material enters each forming cavity. After the injection is completed, the molding begins.

[0041] The mold opening and demolding process of the device is as follows: the drive motor rotates in the opposite direction, causing the moving mold to move away from the fixed mold and open. During the mold opening process, the waste material in the flow distribution cavity detaches from the fixed mold and undergoes the first material cutting; during the separation of the extrusion protrusion from the sprue turntable, friction is generated on the waste material in the flow distribution cavity, creating a gap between the waste material and the sprue turntable; simultaneously, under the action of the elastic structure, a gap is also generated between the sprue turntable and the product forming structure. This gap is a small gap caused by the plasticity of the waste material in the flow distribution cavity, and the elastic structure has not fully recovered. When the worm moves to the worm wheel, the two mesh. Since the worm wheel is fixed while the moving seat continues to move, the worm rotates and drives the first transmission wheel, the second transmission wheel, and the sprue shaft to rotate. After the sprue shaft rotates, the tangential force on the sidewall of the forming groove in the diversion channel causes breakage at each sprue, resulting in a second material breakage. This separates the waste material from the battery casing in the forming cavity. At this point, the elastic structure causes the sprue turntable to pop outward, causing the waste material to fall into the recycling bin. After the mold is opened, the material handling robot extends between the fixed mold and the moving mold, and uses a suction cup to extract the battery casing from the forming cavity.

Claims

1. An injection molding machine, characterized in that, The device includes a feeding box, an extrusion device connected to the feeding box, and a mold opening and closing drive device for controlling the opening and closing of the mold. The mold includes a fixed mold and a movable mold. The mold opening and closing drive device includes a movable seat connected to the movable mold and a drive structure for pushing the movable mold. The bottom of the movable seat is mounted on an mold opening and closing slide rail. The drive structure includes two drive screws. Drive sliders adapted to the drive screws are installed on both sides of the movable mold. The fixed mold has a flow-dividing cavity. The forming cavity is connected to the flow-dividing cavity through a flow-dividing channel. A cutting opening is formed. The moving mold includes a product forming structure and a second flow-dividing cavity forming structure. The second flow-dividing cavity forming structure includes a sprue turntable. The sprue turntable is circumferentially provided with flow-dividing channel forming grooves for forming flow-dividing channels. A sprue rotating shaft is also connected to the sprue turntable. An elastic structure is installed between the sprue turntable and the sprue rotating shaft. The fixed mold is provided with extrusion protrusions for resisting the sprue turntable. During the separation process between the extrusion protrusions and the sprue turntable, friction is generated on the waste material in the flow-dividing cavity, so that a gap is generated between the waste material in the flow-dividing cavity and the sprue turntable.

2. The injection molding machine according to claim 1, characterized in that, The mold opening and closing drive device also includes a guide structure, which further includes guide rods. The guide rods include an upper guide rod installed above the drive screw and a lower guide rod installed below the drive screw. The guide rods are connected to the fixed mold through a fixed mold bearing seat and to the movable mold through a movable mold bearing seat.

3. The injection molding machine according to claim 1, characterized in that, The drive structure also includes a drive motor and a drive wheel mounted on the drive motor. A transmission wheel is also mounted on the drive shaft, and the drive wheel and the transmission wheel are connected by a synchronous belt.

4. An injection molding machine according to claim 3, characterized in that, The drive structure also includes a tensioner, which includes a tensioning pulley for abutting the timing belt.

5. An injection molding machine according to any one of claims 1-4, characterized in that, The fixed mold and the movable mold are respectively equipped with positioning pins and positioning pin holes that are adapted to the positioning pins.

6. An injection molding machine according to claim 1, characterized in that, The extrusion device includes an extrusion tube fixedly connected to the feed box. An extrusion shaft with a spiral groove on the outside is installed inside the extrusion tube. An extrusion channel is formed between the extrusion shaft and the extrusion tube. An extrusion head is installed on the side of the extrusion tube facing the fixed mold, and an extrusion drive device for driving the extrusion shaft to rotate is installed on the side of the extrusion tube facing away from the fixed mold.

7. An injection molding machine according to claim 6, characterized in that, The extrusion tube is fitted with several heating rings on the outside, and the heating rings are fitted with heat insulation sleeves on the outside. The heat insulation sleeves have wiring openings on their lower sides.

8. The injection molding machine according to claim 1, wherein the injection molding machine structure further includes a sprue drive structure for driving the sprue turntable to rotate.

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