Injection molding device capable of reducing accumulated materials at die orifice

Abstract

The utility model relates to the technical field of injection molding, and discloses an injection molding device capable of reducing die orifice accumulated materials, which comprises a lower die and an injection molding pipe arranged on one side of the lower die, and a reset cavity communicated with the injection molding pipe is arranged in the die wall of the lower die; after the spring is compressed by the anti-blocking assembly, the reset cavity is communicated with the storage cavity, so that the thermoplastic plastic is introduced into the mold cavity of the lower mold, and after the injection molding machine stops injecting the thermoplastic plastic, the blocking block is reset into the storage groove under the elastic force action of the reset spring, so that the thermoplastic plastic in the lower mold is prevented from flowing back; strip-shaped blanks can be prevented from being generated on the surface of an injection molding mold, the quality of an injection molding product is improved, the sealing disc compresses thermoplastic plastic in the injection molding pipe while the anti-blocking assembly is reset, then the plastic in the injection molding pipe is discharged through overturning of the spiral blade, curing of the plastic in the injection molding pipe is avoided, and the injection molding efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of injection molding technology, specifically to an injection molding device that reduces material buildup at the mold opening. Background Technology

[0002] Injection molding is a method of shaping industrial products. Products are usually made using rubber injection molding and plastic injection molding. Injection molding can also be divided into injection molding compression molding and die casting. An injection molding machine (or injection molding machine for short) is the main molding equipment that uses plastic molds to make plastic products of various shapes from thermoplastic or thermosetting materials. Injection molding is achieved through an injection molding machine and a mold.

[0003] Most plastic parts are now produced using injection molds. However, existing injection molds cannot effectively block the plastic inside the injection tube during the injection process, resulting in the formation of long strip-shaped blanks at the injection tube opening. This can affect the quality of the mold during mold parting, and long-term accumulation may clog the injection hole, hindering subsequent processing of the workpiece. Therefore, we need to propose an injection device that reduces material accumulation at the mold opening. Utility Model Content

[0004] The purpose of this invention is to provide an injection molding device that reduces material accumulation at the mold opening, prevents backflow of thermoplastic plastic after injection into the mold, and blocks the thermoplastic plastic in the mold and injection tube, thereby improving the quality of the injection molded parts, improving the sealing performance of the injection tube, and preventing the thermoplastic plastic in the injection tube from solidifying and clogging the injection tube, thus improving the injection molding effect and solving the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an injection molding device for reducing material buildup at the mold opening, comprising:

[0006] The lower mold and the injection tube located on one side of the lower mold;

[0007] The lower mold has a reset chamber that communicates with the injection tube inside the mold wall. The reset chamber has a through hole at one end near the mold cavity of the lower mold. The lower mold has a receiving groove that communicates with the connecting hole on one side of the inner cavity. The reset chamber is equipped with a reset spring and an anti-blocking component. The anti-blocking component has a scraping component at one end near the injection tube.

[0008] The anti-blocking component includes a coupling, one end of which is fixedly connected to a sealing block located in a storage groove, and the other end of which is provided with a sealing disc located in a reset chamber, and one end of the reset spring abuts against one side of the sealing disc;

[0009] The scraping assembly includes a rotating shaft rotatably disposed in the middle of the other side of the sealing disc, and a spiral blade that slides against the inner wall of the injection tube is provided on the outer side of one end of the rotating shaft.

[0010] Preferably, a stepped rotating hole is provided in the middle of the other side of the sealing disc, and a bearing for mounting the rotating shaft is embedded in the stepped rotating hole. The axis of the rotating shaft and the axis of the connecting shaft are both arranged on the same straight line.

[0011] Preferably, the inner wall of the reset chamber is provided with a sliding groove, and a slider is provided on the outer side of the sealing disc near the rotating shaft, the length of the slider being less than the thickness of the sealing disc.

[0012] Preferably, the connecting shaft is slidably disposed inside the through hole, and multiple sets of feed holes are provided on the outer side of the sealing block. All sets of feed holes are L-shaped and are arranged at equal angles.

[0013] Preferably, the receiving groove and the reset chamber are connected by multiple sets of flow channels, the outer side of the sealing plate is provided with two sets of annular grooves, and a sealing ring is provided in each set of annular grooves. The mold wall of the lower mold is provided with a coil channel arranged in a thread shape, and a heating coil is provided in the coil channel.

[0014] Preferably, it also includes a base, the lower mold is disposed on one side of the inner cavity of the base, a cylinder is disposed on one side of the base, the telescopic end of the cylinder passes through the base and is fixedly connected to the upper mold, and two sets of limiting rods passing through the base are fixedly connected to one side of the upper mold.

[0015] Preferably, the lower mold has a sealing groove and multiple positioning grooves on its open side, a positioning block inserted into the multiple positioning grooves is fixedly connected to one side of the upper mold, a sealing gasket that fits into the sealing groove is provided on one side of the upper mold, and a guide platform for the upper mold to slide is fixedly connected to the base.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] This invention primarily utilizes the cooperation between the lower mold, injection tube, return spring, anti-blocking component, and scraper component. The anti-blocking component compresses the spring, connecting the return chamber and the receiving chamber, allowing thermoplastic to flow into the lower mold cavity. After the injection molding machine stops injecting thermoplastic, the return spring's elasticity causes the sealing block to return to the receiving groove, preventing backflow of thermoplastic from the lower mold. Simultaneously, it avoids the formation of strip-shaped blanks on the injection mold surface, improving the quality of the injection molded product. While the anti-blocking component returns to its original position, the sealing disc compresses the thermoplastic in the injection tube, causing the plastic to be discharged through the spiral blades, preventing solidification and improving injection molding efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the cross-sectional structure of the lower mold of this utility model;

[0020] Figure 3 This is a schematic diagram of the internal structure of the resetting chamber of this utility model;

[0021] Figure 4 This is a schematic diagram of the anti-clogging component structure of this utility model.

[0022] In the diagram: 1. Base; 2. Lower mold; 21. Reset chamber; 22. Storage groove; 23. Through hole; 24. Guide channel; 25. Coil channel; 26. Slide groove; 3. Guide platform; 4. Upper mold; 5. Cylinder; 6. Limiting rod; 7. Sealing groove; 8. Positioning groove; 9. Positioning block; 10. Injection tube; 11. Heating coil; 12. Scraper assembly; 121. Rotating shaft; 122. Spiral blade; 123. Bearing; 13. Reset spring; 14. Anti-blocking assembly; 141. Connecting shaft; 142. Sealing block; 143. Feed hole; 144. Sealing disc; 145. Ring groove; 146. Sealing ring; 147. Slider; 148. Stepped rotating hole. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1-4 This utility model provides a technical solution: an injection molding device for reducing material accumulation at the mold opening, comprising:

[0025] The lower mold 2 and the injection tube 10 disposed on one side of the lower mold 2;

[0026] The lower mold 2 has a reset chamber 21 that communicates with the injection tube 10 inside the mold wall. The reset chamber 21 has a through hole 23 at one end near the mold cavity of the lower mold 2. The lower mold 2 has a receiving groove 22 that communicates with the connecting hole on one side of the inner cavity. The reset chamber 21 is equipped with a reset spring 13 and an anti-blocking component 14. The anti-blocking component 14 has a scraping component 12 at one end near the injection tube 10.

[0027] The anti-blocking component 14 includes a connecting shaft 141. One end of the connecting shaft 141 is fixedly connected to a sealing block 142 located in the storage groove 22. The other end of the connecting shaft 141 is provided with a sealing disc 144 located in the reset chamber 21. One end of the reset spring 13 abuts against one side of the sealing disc 144.

[0028] The scraping assembly 12 includes a rotating shaft 121 rotatably disposed in the middle of the other side of the sealing disc 144, and a spiral blade 122 that slides against the inner wall of the injection tube 10 is disposed on the outer side of one end of the rotating shaft 121.

[0029] A stepped rotating hole 148 is provided in the middle of the other side of the sealing disc 144. A bearing 123 for mounting the rotating shaft 121 is embedded in the stepped rotating hole 148. The axis of the rotating shaft 121 and the axis of the connecting shaft 141 are both set on the same straight line, which improves the rotation efficiency of the rotating shaft 121. This allows the spiral blade 122 to rotate with the thrust generated when the thermoplastic is injected, which facilitates the scraping of the thermoplastic on the inner wall of the injection tube 10.

[0030] The inner wall of the reset chamber 21 is provided with a sliding groove 26, and a slider 147 is provided on the outer side of the sealing disk 144 near the rotating shaft 121. The length of the slider 147 is less than the thickness of the sealing disk 144. The sliding groove 26 facilitates the angular limitation of the sealing disk 144 to prevent the sealing disk 144 from rotating.

[0031] The connecting shaft 141 is slidably disposed inside the through hole 23. Multiple sets of feed holes 143 are provided on the outer side of the sealing block 142. All sets of feed holes 143 are L-shaped and are set at equal angles. The thermoplastic plastic is conveniently injected into the lower mold 2 at a uniform speed through the feed holes 143, thereby improving the quality of product injection molding.

[0032] Multiple sets of flow channels 24 are connected between the receiving groove 22 and the reset chamber 21. Two sets of annular grooves 145 are provided on the outer side of the sealing plate 144, and sealing rings 146 are provided in both sets of annular grooves 145. A coil channel 25 with a threaded arrangement is provided in the mold wall of the lower mold 2. A heating coil 11 is provided in the coil channel 25. The heating coil 11 can conveniently heat the thermoplastic in the flow channel 24, thereby avoiding the thermoplastic from solidifying, preventing the thermoplastic from blocking the flow channel 24, and improving the injection molding effect.

[0033] It also includes a base 1, a lower mold 2 is set on one side of the inner cavity of the base 1, a cylinder 5 is set on one side of the base 1, the telescopic end of the cylinder 5 passes through the base 1 and is fixedly connected to the upper mold 4, and two sets of limiting rods 6 passing through the base 1 are fixedly connected on one side of the upper mold 4. The cylinder 5 facilitates the closing of the upper mold 4 and the lower mold 2, thus improving the mold closing efficiency.

[0034] The lower mold 2 has a sealing groove 7 and multiple positioning grooves 8 on its open side. The upper mold 4 has a positioning block 9 fixedly connected to one side, which is inserted into the multiple positioning grooves 8. The upper mold 4 has a sealing gasket that fits into the sealing groove 7 on one side. The base 1 has a guide platform 3 fixedly connected to the base 1 for the upper mold 4 to slide. The positioning block 9 improves the mold closing effect of the upper mold 4 and the lower mold 2, and also improves the sealing performance after mold closing.

[0035] In use, an injection molding machine injects thermoplastic plastic into the injection tube 10. The thermoplastic plastic passes through the spiral blade 122 and drives it to rotate, thereby compressing the space between the reset chamber 21 and the injection tube 10, thus compressing the reset spring 13. This causes the slider 147 to move along the slide groove 26. At the same time, the sealing block 142 extends out of the receiving groove 22, connecting the discharge hole with the mold cavity of the lower mold 2. The thermoplastic plastic flows into the receiving groove 22 through the guide channel 24 and is injected into the lower mold 2 through the discharge hole. After injection molding is completed, the injection molding machine stops running. Under the elastic force of the reset spring 13, the reset spring 13 pushes against the wall. When the sealing disc 144 approaches the injection tube 10, it simultaneously resets the sealing block 142 into the receiving groove 22, blocking the backflow of thermoplastic plastic. This also ensures that the inner wall of the lower mold 2 is flush, guaranteeing the flatness of the injection molded product and thus improving the injection molding quality. At the same time, the sealing disc 144 compresses the thermoplastic plastic in the reset chamber 21, causing it to flow back into the injection tube 10. Under the thrust of the thermoplastic plastic, the spiral blade 122 reverses, thereby discharging the plastic from the injection tube 10 and scraping off the plastic from the inner wall of the injection tube 10. This prevents the accumulation of thermoplastic plastic in the injection tube 10 and improves injection efficiency.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An injection molding device for reducing material buildup at the mold opening, characterized in that, include: The lower mold (2) and the injection tube (10) set on one side of the lower mold (2); The lower mold (2) has a reset chamber (21) connected to the injection tube (10) in the mold wall. The reset chamber (21) has a through hole (23) at one end near the mold cavity of the lower mold (2). The lower mold (2) has a receiving groove (22) connected to the connecting hole on one side of the inner cavity. The reset chamber (21) is equipped with a reset spring (13) and an anti-blocking component (14). The anti-blocking component (14) has a scraper component (12) at one end near the injection tube (10). The anti-blocking component (14) includes a connecting shaft (141), one end of which is fixedly connected to a sealing block (142) located in the receiving groove (22), and the other end of which is provided with a sealing disc (144) located in the reset chamber (21), and one end of the reset spring (13) abuts against one side of the sealing disc (144); The scraping assembly (12) includes a rotating shaft (121) rotatably disposed in the middle of the other side of the sealing disc (144), and a spiral blade (122) is provided on the outer side of one end of the rotating shaft (121) to slide against the inner wall of the injection tube (10).

2. The injection molding device for reducing die cavity buildup according to claim 1, characterized in that: A stepped rotating hole (148) is provided in the middle of the other side of the sealing disc (144). A bearing (123) for mounting the rotating shaft (121) is embedded in the stepped rotating hole (148). The axis of the rotating shaft (121) and the axis of the connecting shaft (141) are both set on the same straight line.

3. The injection molding device for reducing die cavity buildup according to claim 2, characterized in that: The inner wall of the reset chamber (21) is provided with a sliding groove (26), and a slider (147) is provided on the outer side of the sealing disc (144) near the rotating shaft (121). The length of the slider (147) is less than the thickness of the sealing disc (144).

4. The injection molding device for reducing die cavity buildup according to claim 3, characterized in that: The connecting shaft (141) is slidably disposed inside the through hole (23). Multiple sets of feed holes (143) are opened on the outer side of the sealing block (142). The multiple sets of feed holes (143) are all L-shaped and are arranged at equal angles.

5. The injection molding device for reducing die orifice material accumulation according to claim 4, characterized in that: The receiving groove (22) is connected to the reset chamber (21) by multiple sets of flow channels (24). The outer side of the sealing plate (144) is provided with two sets of annular grooves (145), and a sealing ring (146) is provided in both sets of annular grooves (145). The mold wall of the lower mold (2) is provided with a coil channel (25) arranged in a threaded manner, and a heating coil (11) is provided in the coil channel (25).

6. The injection molding device for reducing die cavity buildup according to claim 1, characterized in that: It also includes a base (1), the lower mold (2) is set on one side of the inner cavity of the base (1), a cylinder (5) is provided on one side of the base (1), the telescopic end of the cylinder (5) passes through the base (1) and is fixedly connected to the upper mold (4), and two sets of limiting rods (6) passing through the base (1) are fixedly connected on one side of the upper mold (4).

7. The injection molding device for reducing die cavity buildup according to claim 6, characterized in that: The lower mold (2) has a sealing groove (7) and multiple positioning grooves (8) on its open side. The upper mold (4) has a positioning block (9) fixedly connected to one side, which is inserted into the multiple positioning grooves (8). The upper mold (4) has a sealing gasket that fits into the sealing groove (7) on one side. The base (1) has a guide platform (3) fixedly connected to the upper mold (4) for sliding.

Images