Injection molding device for plastic box

Abstract

The utility model provides an injection molding device for a plastic box, belongs to the technical field of injection molding, and solves the technical problem that an existing injection molding device for the plastic box cannot perform synchronous trimming treatment when the plastic box is demoulded. The plastic box injection molding device comprises a rack and a feeding cylinder fixedly installed above the rack, the bottom end of the feeding cylinder is fixedly connected with an injection molding cylinder, the outlet end of the injection molding cylinder is fixedly connected with an injection molding opening, and a fixing plate is fixedly installed on the other side of the injection molding opening. According to the utility model, the tooth grooves are formed in the two sides of the die cavity block, and the other side of the gear is in meshed connection with the rack under the meshing action of the tooth grooves and the gear, so that when the die cavity block moves towards one side of the die core to be closed, the trimming knife automatically moves to one side far away from the die core, and the interference on the molding of a plastic box is avoided; and when the mold cavity block and the mold core are opened for demolding, the trimming knife is synchronously driven to the surface of the mold core for extruding and trimming, so that the injection molding accuracy of the plastic box is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of injection molding technology, and relates to an injection molding device, particularly an injection molding device for plastic boxes. Background Technology

[0002] Plastics are a class of synthetic polymer materials with plasticity. Plastic boxes are generally produced by injection molding, which is a method of shaping industrial products. Injection molding can be further divided into injection molding compression molding and die casting. An injection molding machine is the main molding equipment that uses plastic molds to make various shapes of plastic products from thermoplastic or thermosetting materials. Molds are various molds and tools used in industrial production to obtain the desired products through injection molding, blow molding, extrusion, die casting, forging, smelting, stamping, and other methods. In short, molds are tools used to make shaped items, and injection molding is achieved through injection molding machines and molds.

[0003] A search revealed a Chinese patent document disclosing a plastic injection molding device [Application No.: CN202322349323.9; Publication No.: CN220534837U]. This plastic injection molding device includes a base, a lower mold connected to the base, a cylinder connected to the base, an upper mold connected to the cylinder, a sliding groove on the inner side of the base, a sliding plate slidably connected to the inner side of the sliding groove, a return spring connected to the inner side of the sliding groove, an ejector plate connected to the inner side of the lower mold, an ejector rod connected to the bottom of the ejector plate, a limit plate connected to the free end of the ejector rod, an ejector spring sleeved on the ejector rod, an inclined groove on the sliding plate, the limit plate abutting against the inclined groove, a pushing inclined block connected to the free end of the sliding plate, a fixed frame connected to the side wall of the base, a limiting groove on the fixed frame, and a pushing plate slidably connected to the inner side of the limiting groove.

[0004] Although the plastic injection molding device disclosed in this patent can quickly eject the molded plastic parts from the mold through the ejector plate for easy removal, when the injection molding device is used to process plastic boxes, the edge molding position of the plastic boxes is not accurate enough, so manual trimming is usually required. The degree of mechanization is low, and manual trimming is easy to cause hand cuts, which is not safe. In addition, it is easy to cause scratches on the edge of the plastic box, which seriously affects the aesthetics and molding quality of the plastic box. Utility Model Content

[0005] The purpose of this utility model is to address the aforementioned problems in the existing technology by proposing a plastic box injection molding device. The technical problem to be solved by this utility model is: how to achieve simultaneous trimming during the demolding process of the plastic box injection molding device.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A plastic box injection molding device includes a frame and a feed cylinder fixedly installed above the frame. The bottom end of the feed cylinder is fixedly connected to an injection cylinder, and the outlet end of the injection cylinder is fixedly connected to an injection port. A fixing plate is fixedly installed on the other side of the injection port. The fixing plate is fixedly installed on the surface of the frame. A plurality of guide columns are fixedly connected to one side of the fixing plate, and a fixing seat is fixedly installed at the other end of the guide columns. The fixing seat is fixedly connected to the surface of the frame.

[0008] A telescopic push rod is fixedly installed on the surface of the fixed base, and a moving block is fixedly connected to the output end of the telescopic push rod. The moving block is slidably connected to the outer wall of the guide column. A mold base is fixedly connected to the side of the moving block away from the telescopic push rod, and a mold cavity block is fixedly installed on the surface of the mold base.

[0009] The outer wall of the fixed plate is fixedly connected to the mold core, and the mold core is correspondingly set with the mold cavity block. The outer wall of the mold core is fitted with a trimming knife, and the outer wall of the trimming knife is fixedly installed with a connecting block. The outer wall of the connecting block is slidably connected with a guide plate.

[0010] The connecting block is fixedly installed with racks on both sides, and gears are meshed with the outer walls of the racks, with the gears rotatably connected to the bottom of the guide plate.

[0011] Using the above structure, the movable block is moved by the telescopic push rod, causing the movable block to bring the mold base into contact with one side of the mold core. This allows the mold cavity block to close correspondingly inside the mold core. Simultaneously, the toothed grooves on both sides of the mold cavity block, through meshing with gears, ensure that when the mold cavity block moves to one side of the gear, the gear rotates synchronously. The gear, meshing with the rack on the other side, causes the rack to drive the trimming cutter to one side of the mold cavity block via the connecting block. This avoids interference from the trimming cutter with the closure of the mold core and mold cavity block, facilitating precise molding of the plastic box. After the mold cavity block aligns with the mold core, the... Plastic raw material is added into the feed cylinder, and the plastic raw material is fed into the injection port through the injection cylinder. The raw material then enters the cavity block and the mold core through the fixed plate for injection molding. After the plastic box is formed inside the cavity block and the mold core, the moving block is moved by the telescopic push rod, which opens the cavity block to the mold core on one side. By meshing the connecting groove on the outer wall of the gear, when the cavity block moves away from the mold core, the connecting block drives the trimming blade to move towards the surface of the mold core through the rack. This allows the trimming blade to fit and press against the surface of the mold core, facilitating the trimming blade to perform circumferential trimming on the plastic box.

[0012] Both sides of the mold cavity block are provided with tooth grooves that mesh with the outer wall of the gear, and the tooth grooves and the rack are symmetrically arranged on both sides of the gear.

[0013] By adopting the above structure, a toothed groove is opened on the outer wall of the mold cavity block. Under the meshing action of the toothed groove and the gear, the mold cavity block drives the toothed groove to mesh with the bottom end of the gear. By meshing the toothed groove and the rack on both sides of the gear, the gear rotates synchronously and drives the rack to move. The rack drives the trimming knife to move towards the mold core through the connecting block on one side. The trimming knife then extrudes and trims the surface of the mold core. This realizes that after the mold cavity block is opened for demolding, the trimming knife automatically performs annular trimming on the surface of the mold core, which helps to improve the molding accuracy and aesthetics of the plastic box.

[0014] The guide plate is fixedly connected to a fixed plate and a fixed base at both ends, and the surface of the guide plate is provided with a groove to accommodate the sliding of the connecting block, and a moving block is slidably connected to the outer wall of the guide plate.

[0015] By adopting the above structure and setting the guide plate, the connecting block can move precisely on the surface of the guide plate when driven by the rack and pinion. Moreover, the sliding connection between the moving block and the guide plate allows the moving block to be precisely limited on the outer wall of the guide plate, ensuring the accuracy of the moving block driving the mold base. This achieves precise docking between the mold base and the mold core, which helps to improve the molding accuracy of plastic boxes.

[0016] The connecting blocks are symmetrically arranged about the central axis of the trimming knife, and the trimming knife is arranged in a ring structure.

[0017] By adopting the above structure and setting the trimming blade in a ring, the trimming blade can simultaneously perform a ring cut on the plastic box while being extruded on one side of the mold core, ensuring the efficiency and consistency of trimming the plastic box. Moreover, by symmetrically setting connecting blocks on both sides of the trimming blade, the extrusion force of the trimming blade is balanced, ensuring the trimming effect of the trimming blade and the molding quality of the plastic box.

[0018] The outer wall of the gear is rotatably connected to a side plate, and the side plate is fixedly connected to the outer wall of the guide plate.

[0019] By adopting the above structure and setting the side plate, the rotation stability of the gear on one side of the guide plate is ensured, which ensures the transmission accuracy of the gear driving the rack and tooth groove on both sides. In addition, the structure is simple and the maintenance cost is low.

[0020] The mold core has a discharge port located below it, which is located on the surface of the frame.

[0021] By adopting the above structure and setting the discharge port below the mold core, the injection-molded plastic box is discharged through the discharge port after the edges are trimmed and demolded, ensuring the orderly discharge of the injection-molded plastic box and facilitating the mass production of the plastic box.

[0022] Compared with the prior art, the plastic box injection molding device of this utility model has the following advantages:

[0023] In this invention, by opening toothed grooves on both sides of the mold cavity block, and by meshing the toothed grooves with the gears, and by meshing with the rack on the other side of the gears, when the mold cavity block moves to one side of the mold core to close, the trimming knife automatically moves to the side away from the mold core, avoiding interference with the molding of the plastic box. When the mold cavity block and the mold core open and are demolded, the trimming knife is synchronously transmitted to the surface of the mold core for extrusion trimming, ensuring the accuracy of the injection molding of the plastic box, while avoiding subsequent manual trimming, greatly saving labor costs, and having good transmission performance, realizing the integration of molding and trimming. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a plastic box injection molding device according to this utility model.

[0025] Figure 2 This is a structural schematic diagram of the movable block and the fixed plate in this utility model.

[0026] Figure 3 This is a cross-sectional structural diagram of the trimming knife and toothed rack in this utility model;

[0027] Figure 4 This is a cross-sectional structural diagram of the rack and guide plate in this utility model.

[0028] In the picture:

[0029] 1. Frame; 2. Feed cylinder; 3. Injection cylinder; 4. Injection port; 5. Fixing plate; 6. Guide column; 7. Fixing base; 8. Telescopic push rod; 9. Moving block; 10. Mold base; 11. Mold cavity block; 12. Gear groove; 13. Mold core; 14. Trimming knife; 15. Connecting block; 16. Rack; 17. Guide plate; 18. Gear; 19. Side plate; 20. Outlet. Detailed Implementation

[0030] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0031] Example

[0032] like Figures 1-4 As shown;

[0033] A plastic box injection molding device includes a frame 1, a feed cylinder 2, an injection cylinder 3, an injection port 4, a fixing plate 5, a guide column 6, a fixing base 7, a telescopic push rod 8, a moving block 9, a mold base 10, a mold cavity block 11, a toothed groove 12, a mold core 13, a trimming knife 14, a connecting block 15, a rack 16, a guide plate 17, a gear 18, a side plate 19, and an outlet 20, all fixedly installed above the frame 1. The injection cylinder 3 is fixedly connected to the bottom end of the feed cylinder 2. The inside of the injection cylinder 3 is spiral feeding. Meanwhile, at the outlet end of the injection cylinder 3... An injection port 4 is fixedly connected, and a fixing plate 5 is fixedly installed on the other side of the injection port 4. The setting of the injection cylinder 3 and the injection port 4 facilitates the feeding of materials into the device. The fixing plate 5 is fixedly installed on the surface of the frame 1. Multiple guide columns 6 are fixedly connected to one side of the fixing plate 5. At the same time, a fixing seat 7 is fixedly installed at the other end of the guide column 6. The fixing seat 7 is fixedly connected to the surface of the frame 1. Through this setting, the guide column 6 is fixedly installed between the fixing plate 5 and the fixing seat 7, ensuring the stability of the device.

[0034] Considering the injection molding effect of plastic boxes, a mold core 13 is fixedly connected to the outer wall of the fixed plate 5, and the mold core 13 is correspondingly set with the mold cavity block 11. By setting an injection port 4 on the other side of the fixed plate 5, the plastic raw material is injection molded between the mold core 13 and the mold cavity block 11 through the injection port 4. At the same time, an outlet 20 is set below the mold core 13. The outlet 20 is opened on the surface of the frame 1, which ensures the orderly discharge of the plastic box injection molding and facilitates the large-scale production of plastic boxes.

[0035] Furthermore, to achieve synchronous trimming of the injection-molded plastic box, a trimming blade 14 is attached to the outer wall of the mold core 13, and a connecting block 15 is fixedly installed on the outer wall of the trimming blade 14. The trimming blade 14 is arranged in a ring structure, which facilitates precise ring cutting of the injection-molded plastic box. At the same time, the connecting block 15 is symmetrically arranged about the central axis of the trimming blade 14 to ensure the movement and force balance of the trimming blade 14, thus guaranteeing the trimming effect of the trimming blade 14 and the molding quality of the plastic box. Specifically, to achieve synchronous driving of the trimming blade 14, a guide plate 17 is slidably connected to the outer wall of the connecting block 15. A rack 16 is fixedly installed on both sides of the connecting block 15, and a gear 18 is meshed on the outer wall of the rack 16. To achieve the installation and rotation effect of the gear 18, the gear 18 is rotatably connected to the lower part of the guide plate 17. Specifically, a side plate 19 is rotatably connected to the outer wall of the gear 18. Furthermore, the side plate 19 is fixedly connected to the outer wall of the guide plate 17. The side plate 19 ensures the stability of the gear 18's rotation on one side of the guide plate 17, ensuring the transmission accuracy of the gear 18 driving the racks 16 and tooth grooves 12 on both sides. Meanwhile, considering the installation effect of the guide plate 17, the two ends of the guide plate 17 are fixedly connected to the fixing plate 5 and the fixing seat 7, respectively. The surface of the guide plate 17 is provided with a groove that can accommodate the sliding of the connecting block 15. The outer wall of the guide plate 17 is slidably connected to the moving block 9. The guide plate 17 ensures that the connecting block 15 moves accurately on the surface of the guide plate 17 when driven by the rack 16. Moreover, the sliding connection between the moving block 9 and the guide plate 17 ensures that the moving block 9 is precisely limited on the outer wall of the guide plate 17, ensuring the accuracy of the moving block 9 driving the mold base 10. This achieves the precise docking of the mold base 10 and the mold core 13, which is beneficial to improving the molding accuracy of the plastic box.

[0036] To drive the movable block 9, a telescopic push rod 8 is fixedly installed on the surface of the fixed base 7, and the output end of the telescopic push rod 8 is fixedly connected to the movable block 9. The movable block 9 is slidably connected to the outer wall of the guide post 6. A mold base 10 is fixedly connected to the side of the movable block 9 away from the telescopic push rod 8, and a mold cavity block 11 is fixedly installed on the surface of the mold base 10. Both sides of the mold cavity block 11 are provided with tooth grooves 12 that mesh with the outer wall of the gear 18, and the tooth grooves 12 and the rack 16 are symmetrically arranged on both sides of the gear 18. Through this arrangement, the tooth grooves 12 and the gear 18 mesh with each other. Under the meshing action, when the mold cavity block 11 drives the tooth groove 12 to mesh with the bottom end of the gear 18, the gear 18 rotates synchronously and drives the rack 16 to move through the meshing tooth groove 12 and the rack 16 on both sides of the gear 18. The rack 16 then drives the trimming knife 14 to move towards the mold core 13 through the connecting block 15 on one side. The trimming knife 14 then extrudes and trims the surface of the mold core 13. This achieves automatic annular trimming of the surface of the mold core 13 by the trimming knife 14 after the mold cavity block 11 is opened for demolding, which helps to improve the molding accuracy and aesthetics of the plastic box.

[0037] The working principle of this utility model is as follows: During operation, the telescopic push rod 8 drives the moving block 9 to move, causing the moving block 9 to move the mold base 10 to fit against one side of the mold core 13. This causes the mold cavity block 11 to close correspondingly inside the mold core 13. Simultaneously, with the toothed grooves 12 on both sides of the mold cavity block 11, the toothed grooves 12 mesh with the gear 18. When the mold cavity block 11 moves to one side of the gear 18, the gear 18 rotates synchronously. Under the action of the gear 16 meshing on the other side of the rack 16, the rack 16 drives the trimming blade 14 to move to one side of the mold cavity block 11 through the connecting block 15. This avoids the trimming blade 14 interfering with the closing of the mold core 13 and the mold cavity block 11, facilitating precise molding of the plastic box. After the mold cavity block 11 aligns with the mold core 13, plastic raw material is added into the feed cylinder 2. The plastic raw material is injected through... The plastic cylinder 3 feeds material into the injection port 4, allowing the raw material to enter the space between the mold cavity block 11 and the mold core 13 through the fixed plate 5 for injection molding. After the plastic box is formed inside the mold cavity block 11 and the mold core 13, the telescopic push rod 8 drives the moving block 9 to move, causing the mold cavity block 11 to open the mold core 13 on one side. By meshing with the connecting tooth groove 12 on the outer wall of the gear 18, the mold cavity block 11 moves away from the mold core 13. At the same time, the connecting block 15 drives the trimming blade 14 to move towards the surface of the mold core 13 through the rack 16, causing the trimming blade 14 to press against the surface of the mold core 13. Under the ring action of the trimming blade 14, the mold cavity block 11 simultaneously trims the plastic box when it opens on one side of the mold core 13, ensuring the molding quality of the plastic box. This completes the working principle of the plastic box injection molding device.

[0038] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A plastic box injection molding device comprising a frame (1) and a feeding cylinder (2) fixedly installed above the frame (1), characterized in that: The bottom end of the feeding cylinder (2) is fixedly connected with an injection molding cylinder (3), and the outlet end of the injection molding cylinder (3) is fixedly connected with an injection molding port (4), the other side of the injection molding port (4) is fixedly installed with a fixed plate (5), the fixed plate (5) is fixedly installed on the surface of the rack (1), one side of the fixed plate (5) is fixedly connected with a plurality of guide columns (6), and the other end of the guide column (6) is fixedly installed with a fixed seat (7), and the fixed seat (7) is fixedly connected on the surface of the rack (1); The surface of the fixed seat (7) is fixedly installed with a telescopic push rod (8), and the output end of the telescopic push rod (8) is fixedly connected with a moving block (9), and the moving block (9) is slidingly connected on the outer wall of the guide column (6), and the side of the moving block (9) away from the telescopic push rod (8) is fixedly connected with a mold seat (10), and the surface of the mold seat (10) is fixedly installed with a mold cavity block (11); The outer wall of the fixed plate (5) is fixedly connected with a mold core (13), and the mold core (13) is correspondingly arranged with the mold cavity block (11), the outer side wall of the mold core (13) is connected with an edge trimming knife (14), and the outer wall of the edge trimming knife (14) is fixedly installed with a connecting block (15), and the outer wall of the connecting block (15) is slidingly connected with a guide plate (17); The both sides of the connecting block (15) are fixedly installed with a rack (16), the outer wall of the rack (16) is meshed with a gear (18), and the gear (18) is rotatably connected below the guide plate (17).

2. The device according to claim 1, wherein: The both sides of the mold cavity block (11) are provided with a gear slot (12) meshed with the outer wall of the gear (18), and the gear slot (12) is symmetrically arranged on the both sides of the gear (18).

3. The device according to claim 1, wherein: The both ends of the guide plate (17) are fixedly connected with the fixed plate (5) and the fixed seat (7), respectively, and the surface of the guide plate (17) is provided with a groove capable of accommodating the sliding of the connecting block (15), and the outer wall of the guide plate (17) is slidingly connected with the moving block (9).

4. The device according to claim 3, wherein: The connecting block (15) is symmetrically arranged about the central axis of the edge trimming knife (14), and the edge trimming knife (14) is arranged in an annular structure.

5. The device of claim 2, wherein: The outer wall of the gear (18) is rotatably connected with a side plate (19), and the side plate (19) is fixedly connected to the outer wall of the guide plate (17).

6. The plastic box injection molding device according to claim 1, wherein: The lower part of the mold core (13) is provided with a discharge port (20), and the discharge port (20) is arranged on the surface of the rack (1).

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