A device for assisting the demolding of injection molded products by an injection molding machine

Abstract

The utility model provides a kind of device that auxiliary injection molding machine injection molding product demoulding belongs to injection molding product production technical field, to solve the assembly mode of existing ejector pin and push plate still mainly thread connection, after long-term use is damaged, disassembly and maintenance are more difficult Problem, including fixed mould, transmission box, connecting piece, automatic material receiving assembly and quick positioning assembly;The push plate is slidably connected inside the fixed mould;Multiple The ejector pin is respectively inserted in the inside of push plate;The automatic material receiving assembly is arranged below the fixed mould;The quick positioning assembly is arranged inside the push plate.The utility model realizes demoulding material receiving automation link by automatic material receiving assembly, relies on quick positioning assembly to shorten the replacement downtime of ejector pin, significantly improves injection molding production efficiency and operation convenience, this design not only reduces manual intervention and product loss, reduces equipment maintenance cost, and helps injection molding production line to high-efficiency low-consumption operation transformation.

Description

Technical Field

[0001] This utility model belongs to the field of injection molding product manufacturing technology, and more specifically, it relates to a device for assisting injection molding machine in demolding injection molded products. Background Technology

[0002] After injection molding, the cooled and solidified plastic part needs to be separated from the cavity or core by mechanical or hydraulic driving force. The working principle is: the ejection force of the injection molding machine is transmitted to the ejector pin through the push plate. The ejector pin head directly contacts the plastic part, overcoming the clamping force, friction force and vacuum suction force generated by the cooling and shrinkage of the plastic, so that the plastic part is removed from the mold. The existing auxiliary injection molding machine demolding device generally consists of a hydraulic drive system, ejection execution components and fixing and connecting components.

[0003] Existing application number: CN202023203220.4, this application discloses a directional demolding device for demolding injection molded products, including a mold installed on the top of a base plate, a demolding mechanism, and a conveying mechanism; the demolding mechanism includes a top block, a top rod, and a template; the conveying mechanism includes a support platform and a carrier plate. This application achieves stable clamping of the injection molded product by setting clamping plates, and achieves directional and stable demolding of the finished product by coordinating the movement of the top block. The movable clamping plates ensure that the injection molded product is not damaged during demolding, avoiding damage to the finished product. This application also achieves movement of the carrier plate by setting a support platform, facilitating support and conveying of the demolded finished product. The rack and pinion mechanism enables stable movement of the carrier plate, which is beneficial for subsequent processing of the finished product and improves work efficiency.

[0004] Based on the above, as the core actuator that directly contacts the plastic part and completes the demolding action, the ejector pin is prone to wear such as head wear, rod bending or surface scratches. It needs to be disassembled and replaced regularly to ensure demolding accuracy and plastic part quality. However, the current assembly method of ejector pin and push plate is still mainly threaded connection. After long-term use, it needs to continuously withstand the demolding ejection force, alternating hot and cold impact and the friction of plastic melt. The connecting thread at its end is prone to stripping, thread deformation or even skew of the threaded connection part due to uneven force, wear accumulation or release of pre-tightening stress during assembly. This increases the difficulty of subsequent disassembly and maintenance. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model provides a device for assisting in the demolding of injection-molded products in injection molding machines. This addresses the issue that existing ejector pins, as the core actuators that directly contact the plastic part and complete the demolding action, are prone to wear and tear, such as head wear, rod bending, or surface scratches. Regular disassembly and replacement are necessary to ensure demolding accuracy and part quality. Furthermore, current ejector pin and push plate assembly methods primarily rely on threaded connections. After prolonged use, these connections must withstand continuous demolding force, alternating hot and cold shocks, and friction from the molten plastic. The connecting threads at their ends are prone to stripping, thread deformation, and even misalignment due to uneven stress, accumulated wear, or release of pre-tightening stress during assembly. This increases the difficulty of subsequent disassembly and maintenance.

[0006] The purpose and function of this utility model, which is a device for assisting in the demolding of injection-molded products, are achieved by the following specific technical means: A device for assisting in demolding injection-molded products in an injection molding machine includes a fixed mold, a moving mold, a transmission box, a connecting component, a push plate, ejector pins, an automatic material receiving assembly, and a quick positioning assembly. The moving mold is located on the left side of the fixed mold. The transmission box is fixedly connected to the front of the fixed mold. The connecting component is fixedly connected to the front of the fixed mold. The push plate is slidably connected inside the fixed mold. Multiple ejector pins are provided, and each ejector pin is inserted into the push plate. The automatic material receiving assembly is located below the fixed mold. The quick positioning assembly is located inside the push plate.

[0007] Furthermore, the automatic receiving assembly includes a transmission rack and a transmission gear; the right end of the transmission rack is fixedly connected to the front of the push plate; the transmission gear is rotatably connected inside the transmission box, and the transmission gear meshes with the transmission rack.

[0008] Furthermore, the automatic receiving assembly also includes: a transmission ratchet, a first transmission shaft, and a transmission pawl; the transmission ratchet is coaxially and fixedly connected to the lower part of the transmission gear; the first transmission shaft is rotatably connected inside the connector; the transmission pawl is coaxially and fixedly connected to the top of the first transmission shaft, and the transmission pawl meshes with the transmission ratchet.

[0009] Furthermore, the automatic receiving assembly also includes: a follower block and a tray; the follower block is fixedly connected to the bottom of the first drive shaft; two trays are provided, and the two trays are respectively fixedly connected to the front and rear sides of the follower block.

[0010] Furthermore, the rapid positioning component includes: a sliding operation plate and positioning blocks; the sliding operation plate is slidably connected inside the push plate; multiple positioning blocks are provided, and the multiple positioning blocks are respectively fixedly connected below the sliding operation plate.

[0011] Furthermore, the quick positioning component also includes: positioning grooves and positioning springs; multiple positioning grooves are provided, and the multiple positioning grooves are respectively provided inside multiple ejector pins, and multiple positioning blocks are respectively inserted into the multiple positioning grooves; two positioning springs are provided, the bottoms of the two positioning springs are respectively fixedly connected to the top of the sliding operation plate, and the tops of the two positioning springs are respectively fixedly connected to the inside of the push plate.

[0012] Compared with the prior art, the present invention has the following beneficial effects: First, after the ejector pin completes demolding, the push plate will automatically rotate the double trays 180° during the return process through the automatic material receiving component, so that the tray receiving the product is accurately moved to a position that is easy to pick up the material. The empty tray is simultaneously switched to standby under the demolding, without the need to stop the machine to wait for material to be picked up. This realizes the automated connection of the material picking process after demolding, greatly reduces manual intervention, ensures the continuous operation of the injection molding production line, and significantly improves the overall production efficiency and product yield.

[0013] Secondly, by setting up a quick positioning component, when replacing the ejector pin, simply slide the operating plate upwards to move the positioning block out of the ejector pin's positioning slot, quickly removing the old ejector pin. After installing the new ejector pin, releasing the operating plate will allow the positioning block to automatically insert into the new ejector pin's positioning slot under the rebound action of the positioning spring, achieving precise positioning and fixing of the ejector pin. This eliminates the need for repeated trial installations and calibrations, significantly reducing downtime for ejector pin replacement and minimizing the impact on production rhythm.

[0014] This invention achieves automated connection of demolding and material handling through an automatic material receiving component, and shortens the downtime for ejector pin replacement by relying on a quick positioning component, significantly improving injection molding production efficiency and operational convenience. This design not only reduces manual intervention and product loss and lowers equipment maintenance costs, but also helps injection molding production lines transform towards high-efficiency and low-consumption operation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the push plate structure of this utility model.

[0017] Figure 3 This is a schematic diagram of the transmission rack structure of this utility model.

[0018] Figure 4 This is a schematic diagram of the transmission gear structure of this utility model.

[0019] Figure 5 This is a schematic diagram of the sliding operation panel structure of this utility model.

[0020] Figure 6 This is a schematic diagram of the ejector pin structure of this utility model.

[0021] In the diagram, the correspondence between component names and drawing numbers is as follows: 1. Fixed mold; 2. Moving mold; 3. Transmission box; 4. Connecting part; 5. Push plate; 6. Ejector pin; 601. Positioning groove; 7. Transmission rack; 8. Transmission gear; 801. Transmission ratchet; 9. First transmission shaft; 901. Transmission pawl; 902. Follower block; 903. Tray; 10. Sliding operating plate; 1001. Positioning block; 1002. Positioning spring. Detailed Implementation

[0022] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0023] Example 1: As attached Figure 1 To be continued Figure 6 As shown: This utility model provides a device for assisting in the demolding of injection-molded products in an injection molding machine, including a fixed mold 1, a moving mold 2, a transmission box 3, a connecting piece 4, a push plate 5, ejector pins 6, and an automatic material receiving assembly; the moving mold 2 is located on the left side of the fixed mold 1; the transmission box 3 is fixedly connected to the front of the fixed mold 1; the connecting piece 4 is fixedly connected to the front of the fixed mold 1; the push plate 5 is slidably connected inside the fixed mold 1; multiple ejector pins 6 are provided, and the multiple ejector pins 6 are respectively inserted into the push plate 5; the automatic material receiving assembly is located below the fixed mold 1.

[0024] The automatic feeding assembly includes a transmission rack 7 and a transmission gear 8; the right end of the transmission rack 7 is fixedly connected to the front of the push plate 5; the transmission gear 8 is rotatably connected inside the transmission box 3, and the transmission gear 8 meshes with the transmission rack 7.

[0025] The automatic material receiving assembly also includes: a transmission ratchet 801, a first transmission shaft 9, and a transmission pawl 901; the transmission ratchet 801 is coaxially fixedly connected to the bottom of the transmission gear 8; the first transmission shaft 9 is rotatably connected to the inside of the connector 4; the transmission pawl 901 is coaxially fixedly connected to the top of the first transmission shaft 9, and the transmission pawl 901 meshes with the transmission ratchet 801.

[0026] The automatic receiving component also includes: a follower block 902 and a tray 903; the follower block 902 is fixedly connected to the bottom of the first drive shaft 9; two trays 903 are provided, and the two trays 903 are fixedly connected to the front and rear sides of the follower block 902 respectively.

[0027] The specific usage and function of this embodiment: After the push plate 5 moves to the left, driving the ejector pin 6 to eject the injection-molded product, the product will fall into the tray 903 below the fixed mold 1 and the moving mold 2. Then, the push plate 5 drives the ejector pin 6 to move back to the right. During this process, the push plate 5 drives the transmission rack 7 to move to the right synchronously, and the gear rack transmission mechanism formed by the meshing of the transmission rack 7 and the transmission gear 8 drives the transmission ratchet 801 to rotate. The transmission ratchet 801 drives the first transmission shaft 9 to rotate unidirectionally inside the connecting member 4 through the ratchet pawl transmission mechanism formed by the meshing of the transmission ratchet 901, thereby driving the two trays through the follower block 902. 903 rotates 180°, causing the product receiving tray 903 to rotate to the front of the fixed mold 1, making it easier for workers or robots to pick up. The tray 903, which was previously located in front of the fixed mold 1, will move to the bottom of the fixed mold 1 and the moving mold 2 to receive the next injection-molded product without affecting the production rhythm. When the ejector pin 6 moves to the left again to eject the next finished product, although the transmission rack 7 will move to the left, the first transmission shaft 9 will not rotate under the action of the ratchet and pawl transmission mechanism, so that the two trays 903 will remain in their current positions, making it easy to receive or pick up the finished product.

[0028] Example 2: Based on Example 1, as shown in the appendix Figure 1 To be continued Figure 6 As shown, it also includes a quick positioning component, which is located inside the push plate 5.

[0029] The quick positioning component includes a sliding operation plate 10 and a positioning block 1001. The sliding operation plate 10 is slidably connected inside the push plate 5. Multiple positioning blocks 1001 are provided, and the multiple positioning blocks 1001 are respectively fixedly connected to the bottom of the sliding operation plate 10.

[0030] The quick positioning component also includes: positioning grooves 601 and positioning springs 1002; multiple positioning grooves 601 are provided, and multiple positioning grooves 601 are respectively provided inside multiple ejector pins 6, and multiple positioning blocks 1001 are respectively inserted into multiple positioning grooves 601; two positioning springs 1002 are provided, and the bottom of the two positioning springs 1002 are respectively fixedly connected to the top of the sliding operation plate 10, and the top of the two positioning springs 1002 are respectively fixedly connected to the inside of the push plate 5.

[0031] The specific usage and function of this embodiment: When the ejector pin 6 needs to be replaced after a long period of use, move the sliding operation plate 10 of the push plate 5 upward to expose a part of it. This will cause multiple positioning blocks 1001 to detach from the positioning grooves 601 inside the ejector pin 6. Then, move the ejector pin 6 to the left to remove it from the push plate 5. Then, take out a new ejector pin 6 and insert its right end into the push plate 5. Release the sliding operation plate 10. Under the rebound action of the positioning spring 1002, the multiple positioning blocks 1001 will be inserted into the positioning grooves 601 inside the new ejector pin 6, thereby quickly fixing the ejector pin 6.

[0032] The following points should be noted in this article: 1. The accompanying drawings of this embodiment only involve the structures involved in this embodiment; other structures can refer to the general design.

[0033] 2. Where there is no conflict, this embodiment and the features in the embodiment can be combined with each other to obtain new embodiments.

[0034] The above are merely specific implementations of this embodiment, but the protection scope of this embodiment is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this embodiment should be included within the protection scope of this embodiment. Therefore, the protection scope of this embodiment should be determined by the protection scope of the claims.

Claims

1. A device for assisting in demolding injection-molded products of an injection molding machine, comprising a fixed mold (1), a moving mold (2), a transmission box (3), a connecting piece (4), a push plate (5), an ejector pin (6), an automatic receiving assembly, and a quick positioning assembly; wherein the moving mold (2) is disposed on the left side of the fixed mold (1); characterized in that: The transmission box (3) is fixedly connected to the front of the fixed mold (1); the connector (4) is fixedly connected to the front of the fixed mold (1); the push plate (5) is slidably connected inside the fixed mold (1); multiple ejector pins (6) are provided, and the multiple ejector pins (6) are respectively inserted into the push plate (5); the automatic material receiving component is set below the fixed mold (1); the quick positioning component is set inside the push plate (5).

2. The device for assisting in demolding injection-molded products as described in claim 1, characterized in that: The automatic receiving assembly includes a transmission rack (7) and a transmission gear (8); the right end of the transmission rack (7) is fixedly connected to the front of the push plate (5); the transmission gear (8) is rotatably connected inside the transmission box (3), and the transmission gear (8) meshes with the transmission rack (7).

3. The device for assisting in demolding injection-molded products as described in claim 2, characterized in that: The automatic receiving assembly further includes: a transmission ratchet (801), a first transmission shaft (9), and a transmission pawl (901); the transmission ratchet (801) is coaxially fixedly connected to the bottom of the transmission gear (8); the first transmission shaft (9) is rotatably connected to the inside of the connector (4); the transmission pawl (901) is coaxially fixedly connected to the top of the first transmission shaft (9), and the transmission pawl (901) meshes with the transmission ratchet (801).

4. The device for assisting in demolding injection-molded products as described in claim 3, characterized in that: The automatic receiving assembly also includes: a follower block (902) and a tray (903); the follower block (902) is fixedly connected to the bottom of the first transmission shaft (9); two trays (903) are provided, and the two trays (903) are fixedly connected to the front and rear sides of the follower block (902) respectively.

5. The device for assisting in demolding injection-molded products as described in claim 1, characterized in that: The rapid positioning component includes a sliding operation plate (10) and a positioning block (1001); the sliding operation plate (10) is slidably connected inside the push plate (5); multiple positioning blocks (1001) are provided, and the multiple positioning blocks (1001) are respectively fixedly connected below the sliding operation plate (10).

6. The device for assisting in demolding injection-molded products as described in claim 5, characterized in that: The quick positioning component also includes: a positioning groove (601) and a positioning spring (1002); multiple positioning grooves (601) are provided, and multiple positioning grooves (601) are respectively provided inside multiple ejector pins (6), and multiple positioning blocks (1001) are respectively inserted into the multiple positioning grooves (601); two positioning springs (1002) are provided, and the bottom of the two positioning springs (1002) are respectively fixedly connected to the top of the sliding operation plate (10), and the top of the two positioning springs (1002) are respectively fixedly connected to the inside of the push plate (5).

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