Ejection device of injection molding product

Abstract

The invention relates to an ejection device of an injection product, which comprises a male die holder and a female die holder, the top of the male die holder is provided with a male die, the bottom of the female die holder is provided with a female die, the female die is provided with an ejection mechanism for ejecting the injection product, and the ejection mechanism comprises a pressing plate, an ejection plate and an ejector pin group. The top of the ejector pin group is fixed on the ejector plate, and the bottom of the ejector pin group penetrates through the female mold to eject an injection product; a seesaw mechanism for driving the ejection mechanism to vertically move is arranged at the bottom of the male mold base, the seesaw mechanism comprises a base plate, a seesaw and a pull rod, and a jacking driving part for driving the seesaw to rotate is arranged at the bottom of the base plate. The layout of the ejector pins can be flexibly controlled so as to adapt to a complex curved surface or thin-wall product, it is ensured that an injection molding product can be evenly pressed, and deformation of the product or indentation on the surface of the product is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of injection molds, and in particular to an ejection device for injection molded products. Background Art

[0002] When injection molding a product, the core process includes six stages: mold closing, filling, pressure holding, cooling, mold opening and demolding. The molten plastic material is injected into the middle injection cavity composed of the male mold and the female mold, and after cooling and molding, the mold opening and demolding are carried out.

[0003] After the product is injection molded, it is usually opened first and then demolded through the ejector mechanism. In order to facilitate the drive control of the ejector mechanism, the existing ejector mechanism is usually set in the public mold. As a standardized mold, the public mold's ejector mechanism is usually designed for a general cavity, which is difficult to adapt to complex curved surfaces or thin-walled products. During demolding, the product is easily subjected to local concentrated force due to the fixed layout of the ejector pins, resulting in uneven force on the product during demolding, causing product deformation or surface indentations, thereby affecting the demolding efficiency and product quality of the product. Summary of the invention

[0004] In view of the deficiencies in the prior art, an object of the present invention is to provide an ejection device for injection molded products.

[0005] An ejection device for injection molded products, comprising a male mold base and a female mold base, wherein a male mold is installed on the top of the male mold base, and a female mold is installed on the bottom of the female mold base, and an ejection mechanism for ejecting the injection molded product is provided on the female mold, and the ejection mechanism comprises a pressing plate, an ejection plate and an ejector group, wherein the ejection plate is installed on the bottom of the pressing plate, the top of the ejector group is fixed on the ejector plate, and the bottom of the ejector group penetrates the female mold to eject the injection molded product; A seesaw mechanism is provided at the bottom of the male mold base for driving the ejection mechanism to move vertically, and the seesaw mechanism includes a pad, a seesaw and a pull rod. The seesaw is rotatably installed on the top of the pad and abuts against the bottom of the male mold base. The pull rod passes through the pad, the seesaw, the male mold base and the female mold in sequence. The top of the pull rod is fixedly connected to the pressure plate, and a lifting drive component is provided at the bottom of the pad for driving the seesaw to rotate.

[0006] By adopting the above technical solution, the ejection mechanism is independently installed on the female mold assembly, which can be flexibly adjusted and replaced according to product requirements. The seesaw mechanism is set on the male mold assembly to facilitate the adjustment and control of the ejection mechanism. When opening the mold, since the ejector pins of the female mold assembly can be flexibly arranged according to the product, the injection molded product can be evenly stressed when extruding downward to demold, thereby improving the stability of the injection molded product during demolding and avoiding product deformation or surface indentations.

[0007] The present invention is further configured as follows: an oblong hole is provided on the seesaw for the pull rod to pass through, the inner diameter of the oblong hole is larger than the diameter of the pull rod, the output end of the jacking drive extends to the top of the pad, and contacts the seesaw to push the seesaw to rotate, and the rotation of the seesaw drives the pad to move in a direction away from the mother mold.

[0008] By adopting the above technical solution, since the inner diameter of the oblong hole is larger than the diameter of the pull rod, when the jacking drive pushes the seesaw to rotate on the pad, the seesaw has a larger rotation range, so that the seesaw can drive the pad to move away from the mother mold.

[0009] The present invention is further configured as follows: a connecting rod is fixed on the male mold base, the pad is slidably arranged on the connecting rod, a pull block is provided at the bottom of the pull rod, the female mold drives the pull rod to slide vertically when the mold is opened, and the pull block contacts the bottom of the pad after movement, and one end of the seesaw contacts the pad and drives the pull block to move in a direction away from the female mold.

[0010] By adopting the above technical solution, when the pull block contacts the bottom of the pad, the pad slides downward along the connecting rod, and the pull block can drive the pull rod to move downward stably to ensure that the ejection mechanism can provide uniform pressure on the injection molded product.

[0011] The present invention is further configured as follows: a first resilient member is sleeved on the connecting rod for the seesaw mechanism to reset after the product is demoulded, and two ends of the first resilient member respectively abut against the bottom of the pad and the end of the connecting rod.

[0012] By adopting the above technical solution, during demoulding, the first resilient member plays a buffering role on the pad to prevent the pad from being pressed down too much. After demoulding, the seesaw mechanism can be reset by the first resilient member.

[0013] The present invention is further configured as follows: a positioning rod for limiting the backing plate is fixed on the male mold seat, the positioning rod passes through the male mold seat and extends to the bottom of the male mold seat, and the backing plate is slidably matched with the positioning rod. By adopting the above technical solution, the pad can be further positioned by the positioning rod, thereby improving the stability of the rocker mechanism and the ejection mechanism when ejecting the injection molded product and rebounding and resetting.

[0014] The present invention is further configured as follows: a movable groove is opened on the top of the mother mold, the pressure plate and the ejection plate slide vertically in the movable groove, fixed blocks are provided on both sides of the pressure plate, and are fixedly connected to the top of the pull rod through the fixed blocks, and a positioning pin is fixed on the ejection plate to limit the vertical movement trajectory of the ejection mechanism, and the bottom end of the positioning pin is slidably connected to the mother mold.

[0015] By adopting the above technical solution, the locating pins play a positioning role on the pressure plate and the ejector plate, which can improve the stability of the pressure plate and the ejector plate, thereby improving the stability of the ejector assembly and facilitating uniform force on the injection molded product.

[0016] The present invention is further configured as follows: a second resilient member is provided inside the movable groove for the ejection mechanism to reset after the product is demoulded, and two ends of the second resilient member are respectively in contact with the mother mold and the pressing plate.

[0017] By adopting the above technical solution, after demoulding, the pressure plate can be reset by the second rebound member, and the ejection mechanism and the seesaw mechanism can be quickly reset by the cooperation between the first rebound member and the second rebound member, so as to facilitate the continuous injection molding process.

[0018] The present invention is further configured as follows: a limit block for limiting the reset stroke of the ejection mechanism is provided on the top of the mother mold, the limit block is installed on the outside of the movable groove, and the ejection plate conflicts with the limit block under the elastic force of the second rebound member.

[0019] By adopting the above technical solution, when the pressing plate and the ejector plate rebound upward and reset, the limit block can be used to limit the top of the ejector plate to avoid excessive rebound of the ejector mechanism.

[0020] The present invention is further configured as follows: a perfusion mechanism for injecting molten plastic is provided on the top of the mother mold, the perfusion mechanism includes a runner plate, a sprue sleeve and an injection nozzle, the sprue sleeve sequentially passes through the runner plate, the pressure plate and the ejector plate, the sprue sleeve extends to the bottom of the mother mold, and the injection nozzle is installed on the mother mold base and is plugged into and matched with the sprue sleeve.

[0021] By adopting the above technical solution, the injection nozzle and the gate sleeve can cooperate to convey the molten plastic material to the multiple injection cavities formed by the male mold and the female mold, so as to facilitate the simultaneous injection molding of multiple products and improve the production efficiency of the products.

[0022] The present invention is further configured as follows: the ejector pin group includes a plurality of evenly distributed ejector pins, and the plurality of ejector pins are evenly arranged in a ring shape on the outside of the sprue bushing.

[0023] By adopting the above technical solution, multiple ejectors are evenly arranged on the outside of the gate sleeve. During the product demoulding process, it can be ensured that each injection molded product can be evenly stressed, while improving the demoulding efficiency and effectively avoiding damage to the injection molded product.

[0024] In summary, the beneficial technical effects of the present invention are: 1. By installing the ejector mechanism independently on the female mold assembly, the pressure plate and the ejector plate cooperate with each other, and the layout of the ejector pins can be flexibly controlled to adapt to complex curved surfaces or thin-walled products, and the product can be uniformly stressed during demoulding. The seesaw mechanism with a standardized structure is set on the male mold assembly, which is convenient for flexible control of the ejector mechanism, thereby improving the demoulding efficiency while ensuring that the injection molded product can be uniformly pressed to avoid product deformation or surface indentation; 2. By providing structures such as positioning pins, connecting rods and positioning rods, the ejector mechanism and the seesaw mechanism can be positioned during the process of sliding up and down, so as to improve the stability of the ejector mechanism and the seesaw mechanism during movement, thereby ensuring that the ejector pin can evenly apply pressure to the injection molded product and ensure that the product has high stability during demoulding; 3. By providing the first rebound member and the second rebound member, the ejector mechanism and the seesaw mechanism can be buffered during demoulding to prevent the ejector from pressing down too quickly and causing damage to the product. After demoulding is completed, the ejector mechanism and the seesaw mechanism can rebound and reset quickly, which is convenient for injection molding of subsequent products. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0026] Figure 2 It is a cross-sectional view of the overall structure of an embodiment of the present application.

[0027] Figure 3 It is a structural schematic diagram of the male mold assembly in an embodiment of the present application.

[0028] Figure 4 It is a schematic diagram of the structure of the master mold assembly in the embodiment of the present application.

[0029] Figure 5 It is a structural schematic diagram of the ejection mechanism and the seesaw mechanism in the embodiment of the present application.

[0030] Figure 6 It is a structural exploded view of the ejection mechanism in the embodiment of the present application.

[0031] Figure 7 It is a structural schematic diagram of the seesaw mechanism in the embodiment of the present application.

[0032] Figure 8 It is a schematic diagram of the structure of the ejector plate in the embodiment of the present application.

[0033] Fig. 9 It is a schematic diagram of the structure of the flow channel plate in the embodiment of the present application.

[0034] In the figure, 1, male mold seat, 11, male mold, 12, male mold frame, 13, male mold groove, 2, female mold seat, 21, female mold, 22, female mold frame, 23, female mold groove, 24, movable groove, 25, limit block, 26, guide rod, 3, ejection mechanism, 31, pressure plate, 32, ejection plate, 33, ejector assembly, 34, fixed block, 35, positioning pin, 351, pin head, 4, seesaw mechanism, 41, pad, 42, seesaw, 421, oblong hole, 43, pull rod, 431, pull block, 44, connecting rod, 441, clamp, 45, positioning rod, 5, lifting drive member, 6, first rebound member, 7, second rebound member, 8, runner plate, 81, gate sleeve, 82, injection gun nozzle. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0036] Reference Figure 1-Figure 9 , is an ejection device for injection molded products disclosed in the present invention, comprising a male mold base 1 and a female mold base 2, wherein a male mold 11 is installed on the top of the male mold base 1, and a female mold 21 is installed on the bottom of the female mold base 2, and an ejection mechanism for ejecting the injection molded product is provided on the female mold 21, and the ejection mechanism comprises a pressing plate 31, an ejection plate 32 and an ejector group 33, the ejector plate 32 is fixed to the bottom of the pressing plate 31 by bolts, and multiple groups of ejector groups 33 are evenly fixed on the ejector plate 32, and the top of the ejector group 33 is snap-fitted with the ejector plate 32, and the ejector group The bottom end of 33 contacts the injection molded product after passing through the ejector plate 32. When the ejector plate 32 is fixedly connected to the pressure plate 31 by bolts, the top of the ejector pin group 33 can be tightly fixed by the pressure plate 31. The pressure plate 31 and the ejector plate 32 cooperate with each other, so that the ejector pin group 33 can be replaced and adjusted conveniently, or ejector pin groups 33 of different lengths can be used, so that the layout and size of the ejector pin group 33 can be flexibly controlled, and the ejector pin group 33 can be adjusted according to the shape and size of the product to adapt to complex curved surfaces or thin-walled products.

[0037] A seesaw mechanism is provided at the bottom of the male mold base 1 for driving the ejection mechanism to move vertically. The seesaw mechanism includes a pad 41, a seesaw 42, and a pull rod 43. Two seesaws 42 are symmetrically arranged on the top of the pad 41, and are rotatably connected to the pad 41 through a connecting shaft, and are in conflict with the bottom of the male mold base 1. Two pull rods 43 are symmetrically arranged on the pad 41, and are slidably connected to the pad 41. After the pull rod 43 passes through the pad 41, the seesaw 42, the male mold base 1 and the female mold 21 in sequence, the top of the pull rod 43 is fixedly connected to the pressing plate 31. When opening the mold, the pull rod 43 is driven by the pressing plate 31 to conflict with the bottom of the pad 41.

[0038] A lifting drive component 5 for pushing the seesaw 42 to rotate is provided at the bottom of the pad 41. The lifting drive component 5 can be a hydraulic cylinder, a pneumatic cylinder or an electric push rod. After penetrating the pad 41, the output end of the lifting drive component 5 conflicts with the ends of the two seesaws 42. By adopting a seesaw mechanism with a standardized structure to control the ejection mechanism, it is possible to improve the demoulding efficiency while ensuring that the injection molded product can be evenly pressurized to avoid product deformation or surface indentations.

[0039] During the mold opening process, the injection molding equipment drives the mother mold assembly and the ejection mechanism to move upward. Since the pressure plate 31 and the top of the pull rod 43 are fixed by threaded connection, the pressure plate 31 drives the pull rod 43 to gradually slide upward until the bottom end of the pull rod 43 conflicts with the bottom of the pad 41. After that, the lifting drive 5 is operated, and the output end of the lifting drive 5 squeezes the seesaw 42 upward. The seesaw 42 rotates on the pad 41 through the connecting shaft and squeezes the pad 41 downward, so that the pad 41 drives the pull rod 43 to move downward, and the pressure plate 31 and the ejection plate 32 are driven downward by the pull rod 43. The injection molded product at the bottom of the mother mold assembly is squeezed downward by multiple ejector pin groups 33 at the same time, so that the injection molded product can be evenly stressed and the stability of the injection molded product during demolding can be improved. Moreover, because the connection area between the injection molded product and the mother mold assembly is small, the injection molded product can be prevented from sticking to the mother mold assembly, thereby improving the demolding efficiency and avoiding damage to the injection molded product.

[0040] Reference Figure 2 and Figure 3 A male mold frame 12 is provided at the bottom of the male mold base 1, and the male mold frame 12 is fixedly installed on the injection molding equipment by bolts. The male mold base 1 is fixedly connected to the top of the male mold frame 12 by bolts. A male mold groove 13 is opened at the top of the male mold base 1, and the male mold 11 is fixed to the inner side of the male mold groove 13 by bolts. The male mold frame 12 and the male mold base 1 both adopt standardized structural design. During the injection molding process, different male molds 11 can be replaced according to the processing requirements of the product to improve the adaptability to different products.

[0041] Reference Figure 2 and Figure 4 A mother mold frame 22 is provided on the top of the mother mold base 2, and the mother mold frame 22 is fixedly installed on the injection molding equipment by bolts. The mother mold base 2 is fixedly connected to the bottom of the mother mold frame 22 by bolts. A mother mold groove 23 is opened at the bottom of the mother mold base 2, and the mother mold 21 is fixed to the inner side of the mother mold groove 23 by bolts. The mother mold frame 22 and the mother mold base 2 both adopt standardized structural design. During the injection molding process, different mother molds 21 can be replaced according to the processing requirements of the product to improve the adaptability to different products.

[0042] A guide rod 26 is fixed on the female mold frame 22 near the four corners by bolts. The bottom end of the guide rod 26 is plugged into the male mold frame 12 to perform positioning during the mold opening and closing process, thereby improving the stability of the female mold frame 22 and the male mold assembly.

[0043] In the specific implementation process, the surfaces of the male mold 11 and the female mold 21 are provided with a silica nano-anti-stick coating, so that the surfaces of the male mold 11 and the female mold 21 have good hydrophobic and oleophobic effects, thereby improving the anti-stick properties of the male mold 11 and the female mold 21, preventing the injection molding material from adhering to the surface of the mold, and improving the stability during demolding. When the female mold 21 and the male mold 11 are molded together, a plurality of injection molding cavities are formed between the female mold 21 and the male mold 11. In this embodiment, there are four injection molding cavities, and a plurality of products can be injection molded at the same time, thereby improving the processing efficiency of the products.

[0044] Reference Figure 2 and Figure 5 An integrally formed pull block 431 is provided at the bottom of the pull rod 43. The mother mold 21 drives the pull rod 43 to slide vertically when the mold is opened, and the pull block 431 is in conflict with the bottom of the pad 41 after the mold is opened. When the pad 41 slides downward, the pull block 431 can be pushed to move away from the mother mold 21, and the pull rod 43 drives the ejection mechanism to move downward, so that the ejector group 33 ejects the injection molded product at the bottom of the mother mold 21.

[0045] Reference Figure 3 and Figure 7 Four connecting rods 44 distributed in a rectangular shape are inserted at the bottom of the male mold groove 13, and an integrally formed flat head structure is provided at the bottom end of the connecting rod 44. The top end of the connecting rod 44 passes through the male mold base 1 and extends to the bottom of the male mold groove 13. The top of the connecting rod 44 is threadedly connected with a clamping head 441, and the clamping head 441 is engaged with the bottom of the male mold groove 13. When the male mold 11 is fixed to the inner side of the male mold groove 13 by bolts, the bottom of the male mold 11 can be in conflict with the top of the connecting rod 44, and the connecting rod 44 is fixed to the male mold base 1.

[0046] The pad 41 is arranged between the male mold frame 12 and the male mold base 1, and is slidably connected to the connecting rod 44. The top of the seesaw 42 conflicts with the bottom of the male mold base 1. The jacking drive 5 is installed on the injection molding equipment by bolts, and after the top of the jacking drive 5 passes through the male mold frame 12 and the pad 41, the end of the output shaft of the jacking drive 5 conflicts with the bottom of the seesaw 42. When the jacking drive 5 is running, the output shaft of the jacking drive 5 can push the seesaw 42 to rotate on the pad 41. Since the top of the seesaw 42 conflicts with the bottom of the male mold base 1, the seesaw 42 squeezes the pad 41 downward through the connecting shaft, and the pad 41 slides downward along the connecting rod 44, so that the pad 41 drives the pressure plate 31 and the ejection plate 32 to move downward so that the ejector group 33 ejects the injection molded product.

[0047] In the specific implementation process, in order to facilitate the rotation of the seesaw 42 on the pad 41, an oblong hole 421 is opened on the seesaw 42, and the inner diameter of the oblong hole 421 is larger than the diameter of the pull rod 43. The oblong hole 421 is arranged on the outside of the connecting rod 44 along the length direction of the seesaw 42 to facilitate the lifting drive part 5 to push the seesaw 42 to rotate a certain range on the pad 41.

[0048] In this embodiment, a positioning rod 45 that passes through the male mold seat 1 is inserted at the bottom of the male mold groove 13. The positioning rod 45 is distributed on one of the diagonals of the male mold groove 13, and the top of the positioning rod 45 is snap-fitted with the bottom of the male mold groove 13. When the male mold 11 is installed in the male mold groove 13 by bolts, the male mold 11 is in conflict with the top of the positioning rod 45, and the positioning rod 45 can be fixed. The bottom end of the positioning rod 45 passes through the male mold seat 1 and the pad 41 in turn. When the pad 41 slides up and down along the connecting rod 44, the pad 41 can slide on the positioning rod 45. The pad 41 is further positioned by the positioning rod 45, thereby improving the stability of the pad 41 when it moves, thereby improving the stability of the ejection mechanism driven by the pull rod 43, and ensuring that the ejector group 33 can apply uniform pressure to the injection molded product at the bottom of the female mold 21.

[0049] Reference Figure 5 and Figure 6 A movable groove 24 is provided at the top of the mother mold 21, and the pressing plate 31 and the ejection plate 32 slide vertically along the inner wall of the movable groove 24. Relatively distributed fixed blocks 34 are provided on both sides of the pressing plate 31. The fixed blocks 34 are located outside the movable groove 24 and are integrally formed with the pressing plate 31. The top of the pull rod 43 is threadedly connected and fixed to the fixed block 34, so that the pull rod 43 can be disassembled and replaced.

[0050] In this embodiment, symmetrically distributed positioning pins 35 are fixed to the other two sides of the pressure plate 31, and an integrally formed pin head 351 is provided at the top of the positioning pin 35. The top of the pin head 351 is snap-fitted with the pressure plate 31, and the bottom of the pin head 351 is in conflict with the ejection plate 32. When the pressure plate 31 and the ejection plate 32 are fixed by bolts, the positioning pin 35 can be fixed. The bottom end of the positioning pin 35 penetrates the ejection plate 32 and is slidably connected to the mother mold 21, which can play a positioning role in the process of the pressure plate 31 and the ejection plate 32 sliding up and down, thereby improving the stability of the pressure plate 31 and the ejection plate 32 to ensure that the ejector pin group 33 can apply uniform pressure to the injection molded product.

[0051] Reference Figure 7The first resilient member 6 is sleeved on the connecting rod 44 and located at the bottom of the pad 41. The first resilient member 6 adopts a spring structure. The bottom end of the first resilient member 6 conflicts with the flat head structure at the bottom of the connecting rod 44, and the top end of the first resilient member 6 conflicts with the bottom of the pad 41. When the pad 41 slides downward along the connecting rod 44 for demoulding, the first resilient member 6 will be gradually compressed. Through the cooperation between the bottom of the connecting rod 44 and the first resilient member 6, the maximum downward movement distance of the pad 41 and the pressing plate 31 can be limited to avoid excessive downward pressure of the ejection plate 32 and damage to the mother mold 21. After the demoulding is completed, the output end of the jacking drive member 5 moves downward and away from the seesaw 42. At the same time, under the elastic action of the first resilient member 6, the pad 41 can gradually rebound and reset upward, and drive the pressing plate 31 to gradually reset upward.

[0052] Reference Figure 6 and Figure 8 A second resilient member 7 is provided on the inner side of the movable groove 24. The second resilient member 7 adopts a spring structure. A plurality of evenly distributed spring holes are provided on the edge of the ejection plate 32. The second resilient member 7 is provided on the inner side of the spring hole, and the two ends of the second resilient member 7 are respectively in conflict with the mother mold 21 and the pressing plate 31. When the pull rod 43 drives the pressing plate 31 and the ejection plate 32 to move downward, and pushes the ejector pin group 33 to move downward for demoulding, the second resilient member 7 is gradually compressed. After the demoulding is completed, the second resilient member 7 can apply an upward elastic force to the pressing plate 31 to facilitate the rapid resetting of the pressing plate 31. The first resilient member 6 and the second resilient member 7 cooperate with each other, which can have a good rebound effect on the ejection mechanism and the seesaw mechanism.

[0053] In this embodiment, a limit block 25 for limiting the reset stroke of the ejection mechanism 3 is provided on the mother mold 21 and located on the outer side of the movable groove 24. The limit block 25 is fixedly connected to the mother mold 21 by bolts, and the top of the limit block 25 extends to the top of the ejection plate 32. A groove is provided on the pressure plate 31 and located on the outer side of the limit block 25 to prevent the pressure plate 31 from rubbing against the limit block 25 during movement. During the rebound process, the ejection plate 32 conflicts with the limit block 25 under the elastic force of the second rebound member 7. The limit block 25 can limit the maximum upward movement distance of the ejection mechanism and the seesaw mechanism to prevent the top of the pressure plate 31 from conflicting with the flow channel plate 8, thereby preventing the flow channel plate 8 from being damaged by pressure.

[0054] Reference Figure 6 and Fig. 9The top of the mother mold 21 is fixed with a flow plate 8 by bolts, and a plurality of sprue sleeves 81 are arranged on the flow plate 8. The sprue sleeves 81 sequentially penetrate the flow plate 8, the pressure plate 31 and the ejection plate 32 and extend to the bottom of the mother mold 21. The top of the sprue sleeve 81 is engaged with the flow plate 8. When the mother mold 21 is fixed inside the mother mold groove 23 by bolts, the top of the flow plate 8 is in close contact with the mother mold base 2, and the sprue sleeves 81 are fixed. The mouth sleeve 81 is plugged into the injection nozzle 82, and the injection nozzle 82 is connected to the feeding system of the injection molding equipment. In the specific implementation process, there are at least four sprue sleeves 81 and injection nozzles 82, corresponding to the number of injection cavities formed after the male mold 11 and the female mold 21 are combined. The injection nozzle 82 and the sprue sleeve 81 can cooperate to transport the molten plastic material to the injection cavity formed by the male mold 11 and the female mold 21, so as to facilitate the simultaneous injection molding of multiple products.

[0055] In the present embodiment, the ejector pin group 33 includes a plurality of evenly distributed ejector pins, which are arranged in a circular array on the outer side of the sprue sleeve 81. Each sprue sleeve 81 has a group of ejector pin groups 33 on the outer side. When multiple products are injection molded, each group of ejector pin groups 33 corresponds to the injection molded products one by one. During the demolding process, the pressing plate 31 can drive the plurality of groups of ejector pin groups 33 to be pressed down at the same time, and each injection molded product at the bottom of the mother mold 21 can be demolded independently, ensuring that each injection molded product can be evenly stressed, thereby effectively avoiding damage to the injection molded products while improving the demolding efficiency.

[0056] The implementation principle of this embodiment is as follows: after the product is injection molded, the injection molding equipment drives the female mold frame 22 and the female mold 21 to move upward to open the mold. During the mold opening process, the product is driven upward by the female mold 21 and separated from the male mold 11. In the process of the female mold 21 moving upward, the pressing plate 31 is driven upward, and the pressing plate 31 drives the pull rod 43 to gradually move upward until the bottom of the pull rod 43 conflicts with the bottom of the pad 41. After that, the lifting drive member 5 presses the seesaw 42 upward through the output end, so that the seesaw 42 is pressed against the pad The top of the seesaw 42 gradually contacts the bottom of the male mold base 1, and the backing plate 41 is pressed downwardly through the connection axis with the backing plate 41, so that the backing plate 41 drives the pressing plate 31 and the ejector plate 32 to move downward through the pull rod 43, and the multiple ejector pin groups 33 slide downward on the female mold 21 and squeeze the product evenly, so that the product is separated from the female mold 21. Since the connection area between the injection molded product and the female mold 21 is small, the adhesion between the injection molded product and the female mold 21 can be avoided, and the damage of the injection molded product can be avoided while improving the demoulding efficiency.

[0057] After demoulding is completed, the output end of the lifting drive member 5 gradually moves downward and separates from the seesaw 42. Under the elastic action of the first rebound member 6, the pad 41 and the seesaw 42 gradually rebound and reset. Under the action of the second rebound member 7, the ejection plate 32 and the pressure plate 31 rebound and reset synchronously to improve the rebound efficiency of the ejection mechanism and the seesaw mechanism, which is convenient for subsequent injection molding of the product.

[0058] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An ejection device for an injection molded product, comprising a male mold base (1) and a female mold base (2), wherein a male mold (11) is mounted on the top of the male mold base (1), and a female mold (21) is mounted on the bottom of the female mold base (2), characterized in that: The mother mold (21) is provided with an ejection mechanism (3) for ejecting the injection molded product, the ejection mechanism (3) comprising a pressing plate (31), an ejection plate (32) and an ejector pin group (33), the ejection plate (32) being mounted on the bottom of the pressing plate (31), the ejector pin group (33) being fixed on the ejection plate (32), and the bottom of the ejection plate (32) passing through the mother mold (21) to eject the injection molded product; A seesaw mechanism (4) is provided at the bottom of the male mold base (1) for driving the ejection mechanism (3) to move vertically. The seesaw mechanism (4) comprises a pad (41), a seesaw (42) and a pull rod (43). The seesaw (42) is rotatably mounted on the top of the pad (41) and abuts against the bottom of the male mold base (1). The pull rod (43) passes through the pad (41), the seesaw (42), the male mold base (1) and the female mold (21) in sequence. The top of the pull rod (43) is fixedly connected to the pressure plate (31). A lifting drive member (5) is provided at the bottom of the pad (41) for driving the seesaw (42) to rotate.

2. The ejection device for injection molded products according to claim 1, characterized in that: The seesaw (42) is provided with an oblong hole (421) for the pull rod (43) to pass through, and the inner diameter of the oblong hole (421) is larger than the diameter of the pull rod (43). The output end of the lifting drive member (5) extends to the top of the pad (41) and contacts the seesaw (42) to push the seesaw (42) to rotate. The rotation of the seesaw (42) drives the pad (41) to move in a direction away from the mother mold (21).

3. The ejection device for injection molded products according to claim 2, characterized in that: A connecting rod (44) is fixed on the male mold base (1), the pad (41) is slidably arranged on the connecting rod (44), a pull block (431) is provided at the bottom of the pull rod (43), and the female mold (21) drives the pull rod (43) to slide vertically when the mold is opened, and after the movement, the pull block (431) contacts the bottom of the pad (41), and one end of the seesaw (42) contacts the pad (41) and drives the pull block (431) to move in a direction away from the female mold (21).

4. The ejection device for injection molded products according to claim 3, characterized in that: The connecting rod (44) is sleeved with a first resilient member (6) for the seesaw mechanism (4) to return to its original position after the product is demoulded, and the two ends of the first resilient member (6) respectively contact the bottom of the pad (41) and the end of the connecting rod (44).

5. The ejection device for injection molded products according to claim 3, characterized in that: A positioning rod (45) for limiting the position of the backing plate (41) is fixed on the male mold base (1); the positioning rod (45) penetrates the male mold base (1) and extends to the bottom of the male mold base (1); the backing plate (41) and the positioning rod (45) are slidably matched.

6. The ejection device for injection molded products according to claim 1, characterized in that: A movable groove (24) is provided at the top of the mother mold (21), and the pressure plate (31) and the ejection plate (32) slide vertically in the movable groove (24). Fixed blocks (34) are provided on both sides of the pressure plate (31), and are fixedly connected to the top of the pull rod (43) through the fixed blocks (34). A positioning pin (35) for limiting the vertical movement trajectory of the ejection mechanism (3) is fixed on the ejection plate (32), and the bottom end of the positioning pin (35) is slidably connected to the mother mold (21).

7. The ejection device for injection molded products according to claim 6, characterized in that: A second resilient member (7) is provided on the inner side of the movable groove (24) for the ejection mechanism (3) to return to its original position after the product is demoulded, and two ends of the second resilient member (7) are respectively in contact with the mother mold (21) and the pressing plate (31).

8. The ejection device for injection molded products according to claim 7, characterized in that: A limit block (25) for limiting the return stroke of the ejection mechanism (3) is provided at the top of the mother mold (21); the limit block (25) is installed on the outside of the movable groove (24); and the ejection plate (32) abuts against the limit block (25) under the elastic force of the second resilient member (7).

9. The ejection device for injection molded products according to claim 1, characterized in that: The top of the mother mold (21) is provided with an injection mechanism for injecting molten plastic, and the injection mechanism includes a runner plate (8), a sprue sleeve (81) and an injection nozzle (82). The sprue sleeve (81) passes through the runner plate (8), the pressure plate (31) and the ejector plate (32) in sequence. The sprue sleeve (81) extends to the bottom of the mother mold (21). The injection nozzle (82) is installed on the mother mold base (2) and is plugged into and matched with the sprue sleeve (81).

10. The ejection device for injection molded products according to claim 9, characterized in that: The ejector pin group (33) comprises a plurality of evenly distributed ejector pins, and the plurality of ejector pins are evenly arranged in a ring shape on the outside of the sprue sleeve (81).

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