CN118288491A

CN118288491A - Punching device for injection mold

Info

Publication number: CN118288491A
Application number: CN202410580087.8A
Authority: CN
Inventors: 卜辉; 马勇; 龙伟宏
Original assignee: Yiyang Dechuang Precision Mould Co ltd
Current assignee: Yiyang Dechuang Precision Mould Co ltd
Priority date: 2024-05-11
Filing date: 2024-05-11
Publication date: 2024-07-05

Abstract

The invention relates to the technical field of injection molds and discloses a punching device for an injection mold, which comprises a fixed mold, a movable mold and a punching mechanism, wherein the punching mechanism is arranged on the movable mold; according to the invention, the punching mechanism is integrated on the injection mold, so that punching operation can be rapidly performed after injection molding is completed and before mold opening is performed, and meanwhile, the punching tool bit is adjusted according to the required through groove shape, so that the problem of high cost caused by using a plurality of special molds is solved, the production flow is simplified, the processing efficiency is improved, the influence of the product quality possibly caused by multiple treatments is reduced, the design of the injection mold is simpler, and the flowing time of molten plastic in the mold cavity is reduced due to the reduction of the structure required for forming the through groove in the filling process of the molten plastic, so that the injection molding efficiency and the injection molding quality are improved.

Description

Punching device for injection mold

Technical Field

The invention relates to the technical field of injection molds, in particular to a punching device for an injection mold.

Background

Injection molds are a production tool for manufacturing plastic products. In the injection molding process, a plastic raw material is firstly added into a charging barrel of an injection molding machine in a particle form, heated and melted, and then molten plastic is injected into a cavity of a mold under high pressure through a screw. After cooling and solidifying for a period of time, the mold can be opened after the plastic part reaches a certain strength, and the plastic part is ejected out of the mold through an ejection mechanism on the injection molding machine, so that one production cycle is completed.

In the field of injection molding production, the main body structure of a product design is often the same, but through grooves with different shapes are required to be designed in the middle of the product; in the prior art, the production of such products is usually carried out by a multi-mould method, i.e. designing a plurality of moulds according to the shape of the product, which requires designing separate injection moulds for each channel shape, resulting in a sharp rise in mould costs, and in the filling process, the formation of the channel structure increases the flow time of the molten plastic in the mould, thereby affecting the production cycle and efficiency. Secondly, the subsequent processing method, namely, after injection molding is finished, taking out the product and then punching the product independently, although the investment of the die is reduced by using a universal die, the introduction of punching or other mechanical processing steps clearly increases the complexity of the flow, reduces the overall processing efficiency, and the injection molded product needs to be positioned again during punching, so that the quality of the product can be negatively affected by multiple treatments.

Accordingly, there is a need to provide a punching device for an injection mold that solves the above-mentioned problems.

Disclosure of Invention

The invention aims to provide a punching device for an injection mold, which reduces the flowing time of molten plastics in a mold cavity and improves the injection efficiency and injection quality.

The technical aim of the invention is realized by the following technical scheme: the utility model provides a punching device for injection mold, includes stationary mold, movable mold and punching mechanism, punching mechanism sets up on the movable mold, the die cavity has been seted up to the bottom of movable mold, first installation cavity has been seted up to the inside of movable mold, be provided with two shrouding between die cavity and the first installation cavity, the close one side activity laminating of two shrouding, be provided with the drive mechanism that is used for driving two shrouding relative movement on the movable mold;

The punching mechanism comprises a lifting plate, a mounting plate and a punch, wherein the lifting plate is arranged in the first mounting cavity in a sliding mode, a driving mechanism used for driving the lifting plate to lift is arranged above the lifting plate, the mounting plate is detachably arranged at the bottom end of the lifting plate, at least one punch is fixedly arranged at the bottom end of the mounting plate, after an injection molding product is cooled and formed, the two sealing plates are driven to be away from each other through the driving mechanism, the first mounting cavity is communicated with a die cavity, and the lifting plate is driven to move downwards through the driving mechanism, so that the punch punches the injection molding product.

The invention is further provided with: the transmission mechanism comprises a mounting seat, a driving seat and a screw rod, wherein the mounting seat is fixedly arranged at the top end of a movable die, a connecting plate is fixedly arranged on one side of the sealing plate, the driving seat is fixedly arranged at the top end of the connecting plate, the screw rod penetrates through the driving seat, the screw rod is in threaded connection with the driving seat, the screw rod penetrates through the mounting seat, the screw rod is rotationally connected with the mounting seat, a first gear is fixedly arranged at one end of the screw rod, a rotating shaft is rotationally arranged on the mounting seat, a second gear and a third gear are fixedly sleeved on the rotating shaft, the second gear is meshed with the first gear, the radius of the second gear is larger than that of the first gear, so that the function of adjusting the rotating speed is achieved, a rack is meshed on one side of the third gear, and a pushing assembly for pushing the rack to move is arranged above the rack.

The invention is further provided with: the top fixed mounting of lifter plate has the connecting rod, the top fixed mounting of connecting rod has the drive plate, the both sides on movable mould top are provided with second elastic connection subassembly, second elastic connection subassembly includes the second connecting cylinder, second connecting cylinder fixed mounting is in the top of movable mould, the fixed cover in top of second connecting cylinder is equipped with the spacing ring, the second connecting cylinder runs through the drive plate, and second connecting cylinder and drive plate sliding fit, the cover is equipped with the third spring on the second connecting cylinder, the drive plate passes through third spring and movable mould's roof elastic connection.

The invention is further provided with: the driving mechanism comprises a cylinder, the cylinder is arranged above the movable die, the output end of the cylinder is fixedly connected with a first cross rod and a second cross rod, the first cross rod and the second cross rod are mutually perpendicular, the output end of the cylinder is fixedly provided with a jacking column, and the jacking column is arranged right above the transmission plate; the two sides of the bottom end of the first cross rod are respectively provided with a first elastic connecting component, and the first cross rod is elastically connected with the rack through the first elastic connecting components.

The invention is further provided with: the second elastic connecting assembly further comprises a second connecting column and a second spring, the top end of the second connecting column is fixedly connected with the second cross rod, the bottom end of the second connecting column stretches into the second connecting cylinder, the second spring is arranged in the second connecting cylinder, and the second connecting column is elastically connected with the second connecting cylinder through the second spring.

The invention is further provided with: the second installation cavity has been seted up to the inside of cover half utensil, the top of fixed mould is provided with the terrace die, the terrace die includes mould frame and mold core, the mold core slides and sets up the inside at the mould frame, mould frame fixed mounting is in the top of cover half utensil, be provided with the fourth spring in the second installation cavity, the top of fourth spring is connected with the diapire of mold core, the bottom of fourth spring is connected with the bottom inner wall of second installation cavity, be provided with the backstop subassembly that is used for carrying out the support to the mold core on the fixed mould.

The invention is further provided with: the stop assembly comprises a locking plate, a push plate and a tension spring, wherein the top wall of the locking plate is attached to the bottom wall of the mold core in the injection molding process, the locking plate is in sliding fit with the fixed mold, one end of the locking plate is fixedly connected with the push plate, one end of the tension spring is connected with the fixed mold, the other end of the tension spring is connected with the push plate, a baffle column is fixedly arranged on the side wall of the fixed mold, and two connecting plates are positioned between the two push plates during mold closing.

The invention is further provided with: the mold is characterized in that a third mounting cavity is formed in the mold body, a first sliding block is slidably mounted in the third mounting cavity, one side of the first sliding block is fixedly connected with a one-way locking block, the other side of the first sliding block is connected with a fifth spring, the first sliding block is elastically connected with the inner side wall of the third mounting cavity through the fifth spring, one end of the one-way locking block extends into the third mounting cavity, a plurality of locking grooves are formed in the side wall of the mold core, the one-way locking block is matched with the locking grooves, a first magnetic block is arranged at the bottom of the first sliding block, a second magnetic block is arranged at the top of the locking plate, and the first magnetic block and the second magnetic block are magnetically attracted.

The invention is further provided with: the first elastic connecting assembly comprises a first connecting cylinder, a first connecting column and a first spring, wherein the top end of the first connecting cylinder is fixedly connected with the first cross rod, the bottom end of the first connecting column is fixedly connected with the rack, the top end of the first connecting column stretches into the first connecting cylinder, the first connecting column is in sliding fit with the first connecting cylinder, the first spring is arranged in the first connecting cylinder, and the first connecting column is in elastic connection with the first connecting cylinder through the first spring.

In summary, the invention has the following beneficial effects:

1. According to the invention, the punching mechanism is integrated on the injection mold, so that punching operation can be rapidly performed after injection molding is completed and before mold opening is performed, and meanwhile, the punching tool bit is adjusted according to the required through groove shape, so that the problem of high cost caused by using a plurality of special molds is solved, the production flow is simplified, the processing efficiency is improved, the influence of the product quality possibly caused by multiple treatments is reduced, the design of the injection mold is simpler, and the flowing time of molten plastic in the mold cavity is reduced due to the reduction of the structure required for forming the through groove in the filling process of the molten plastic, so that the injection molding efficiency and the injection molding quality are improved;

2. according to the invention, the multifunctional utilization of a single cylinder is realized through the cooperative mechanism of the first elastic connecting component, the second elastic connecting component, the jacking column and the punch. The configuration allows the cylinder to accurately drive the movement of the sealing plate and the punch in stages while completing the die closing and opening actions of the movable die, ensures orderly progress of each process, and avoids potential mutual interference. The design optimization reduces the manufacturing cost of the whole device, remarkably improves the operation synchronism and reduces the system error, thereby improving the whole operation precision and efficiency.

Drawings

FIG. 1 is a schematic three-dimensional structure of the present invention;

FIG. 2 is a schematic view of a three-dimensional structure of the present invention during mold closing;

FIG. 3 is a schematic cross-sectional view of the present invention;

FIG. 4 is an enlarged schematic view of the structure of FIG. 3A according to the present invention;

FIG. 5 is an enlarged schematic view of the structure of FIG. 3B according to the present invention;

FIG. 6 is a schematic view of the structure of the present invention in punching;

FIG. 7 is a schematic view of the drive mechanism and closure plate of the present invention;

FIG. 8 is a schematic view of the structure of the mold core and locking plate of the present invention;

FIG. 9 is an enlarged schematic view of the structure of FIG. 8C according to the present invention;

FIG. 10 is a schematic cross-sectional view of a first resilient connecting element of the present invention;

fig. 11 is a schematic cross-sectional view of a second elastic connection assembly of the present invention.

In the figure: 1. setting a mold; 101. a mold frame; 102. a second mounting cavity; 2. a movable mold; 201. a first mounting cavity; 3. a lifting plate; 4. a mounting plate; 5. a punch; 6. a sealing plate; 7. a connecting plate; 8. a driving seat; 9. a screw rod; 10. a mounting base; 11. a first gear; 12. a rotating shaft; 13. a second gear; 14. a third gear; 15. a rack; 16. a first elastic connection assembly; 161. a first connecting cylinder; 162. a first connection post; 163. a first spring; 164. a limiting block; 17. a first cross bar; 18. a cylinder; 19. a top column; 20. a connecting rod; 21. a drive plate; 22. a second cross bar; 23. a second elastic connection assembly; 231. a second connection post; 232. a second connecting cylinder; 233. a second spring; 24. a limiting ring; 25. a third spring; 26. a mold core; 2601. a locking groove; 27. a fourth spring; 28. a locking plate; 29. a push plate; 30. a tension spring; 31. a baffle column; 32. a second slider; 33. a first slider; 34. a one-way locking block; 35. a fifth spring; 36. a first magnetic block; 37. and a second magnetic block.

Detailed Description

The present invention will be further described with reference to the drawings in the embodiments of the present invention.

Referring to fig. 1 to 5, fig. 10 and fig. 11, in the embodiment of the invention, a punching device for an injection mold comprises a fixed mold 1, a movable mold 2 and a punching mechanism, wherein the punching mechanism is arranged on the movable mold 2, a mold cavity is formed at the bottom of the movable mold 2, a first mounting cavity 201 is formed inside the movable mold 2, two sealing plates 6 are arranged between the mold cavity and the first mounting cavity 201, one sides of the two sealing plates 6 are in movable fit, a transmission mechanism for driving the two sealing plates 6 to move relatively is arranged on the movable mold 2, the punching mechanism comprises a lifting plate 3, a mounting plate 4 and a punch 5, the lifting plate 3 is slidably arranged in the first mounting cavity 201, a driving mechanism for driving the lifting plate 3 to lift is arranged above the lifting plate 3, the mounting plate 4 is detachably arranged at the bottom end of the lifting plate 3, the first mounting cavity 201 can be detachably connected through bolts, at least one punch 5 is fixedly arranged at the bottom end of the mounting plate 4, the shape and the number of the two sealing plates 6 can be used for enabling the two sealing plates to be in a movable fit, and the two sealing plates to be mutually customized to be driven by the driving mechanism after the two sealing plates are in a movable mode, and the two sealing plates are far away from the first mounting cavity 201 and are driven by the driving mechanism, and the driving mechanism is firstly far away from the first driving mechanism is connected with the lifting mechanism through the first driving mechanism through the driving mechanism after the two sealing plates are used for cooling, and the driving mechanism is in a cooling mode; the side wall of movable mould 2 is provided with the injection molding mouth, the injection molding mouth is linked together with the die cavity of movable mould 2, first compound die, two shrouding 6 laminating mutually this moment, then can carry out the injection molding, wait after the injection molding cooling shaping, first two shrouding 6 mutual distances of drive through drive mechanism, make first installation cavity 201 and die cavity be linked together, rethread drive mechanism drive lifter plate 3 downwardly moving, make drift 5 punch a hole to the injection molding, then can open the mould, the rethread is artifical or unloading equipment go on the unloading can, when punching a hole the shape need adjust, can dismantle mounting panel 4 change different drifts 5, for setting up a plurality of moulds, the cost of changing drift 5 is lower, this scheme is through integrating a punching mechanism on the injection mould, can be after the injection molding is accomplished and before opening the mould rapidly carry out the operation of punching operation, simultaneously according to the required form adjustment punching tool bit of leading to the groove, so both overcome the high cost problem that uses a plurality of special moulds to bring, production flow has also been simplified, and processing efficiency has been improved, and product quality has been reduced because of the multiple treatment can be influenced, and the design is simpler, and the time has reduced and has improved the quality in the injection molding mould has been filled in the required mould, and has reduced the mould cavity because the required to flow has improved the injection molding time.

In this embodiment, preferably, the transmission mechanism includes a mounting seat 10, a driving seat 8 and a screw rod 9, the mounting seat 10 is fixedly mounted at the top end of the moving mold 2, a connecting plate 7 is fixedly mounted at one side of the sealing plate 6, the driving seat 8 is fixedly mounted at the top end of the connecting plate 7, the screw rod 9 penetrates through the driving seat 8, and the screw rod 9 is in threaded connection with the driving seat 8, the screw rod 9 penetrates through the mounting seat 10, and the screw rod 9 is rotationally connected with the mounting seat 10, a first gear 11 is fixedly mounted at one end of the screw rod 9, a rotating shaft 12 is rotationally mounted on the mounting seat 10, a second gear 13 and a third gear 14 are fixedly sleeved on the rotating shaft 12, the second gear 13 is meshed with the first gear 11, the radius of the second gear 13 is larger than that of the first gear 11, so as to play a role in regulating the rotating speed, a rack 15 is meshed at one side of the third gear 14, and a pushing component for pushing the rack 15 to move is arranged above the rack 15; when the driving sealing plate 6 moves, the rack 15 is pushed to move through the pushing component, the rotating shaft 12 is driven to rotate through the third gear 14 when the rack 15 moves, the second gear 13 is driven to rotate when the rotating shaft 12 rotates, the first gear 11 is driven to rotate when the second gear 13 rotates, the screw rod 9 is driven to rotate, the driving seat 8 is driven to move when the screw rod 9 rotates, and the sealing plate 6 is driven to move through the connecting plate 7.

In this embodiment, preferably, the top end of the lifting plate 3 is fixedly provided with a connecting rod 20, the top end of the connecting rod 20 is fixedly provided with a transmission plate 21, two sides of the top end of the moving die 2 are provided with second elastic connection assemblies 23, the second elastic connection assemblies 23 comprise second connection cylinders 232, the second connection cylinders 232 are fixedly arranged at the top end of the moving die 2, the top of the second connection cylinders 232 are fixedly sleeved with limiting rings 24, the second connection cylinders 232 penetrate through the transmission plate 21, the second connection cylinders 232 are in sliding fit with the transmission plate 21, the second connection cylinders 232 are sleeved with third springs 25, and the transmission plate 21 is elastically connected with the top wall of the moving die 2 through the third springs 25; when the spring is in its natural state, the punch 5 is retracted within the first mounting cavity 201.

In this embodiment, preferably, the driving mechanism includes an air cylinder 18, the air cylinder 18 is disposed above the moving mold 2, an output end of the air cylinder 18 is fixedly connected with a first cross rod 17 and a second cross rod 22, the first cross rod 17 and the second cross rod 22 are disposed perpendicular to each other, an output end of the air cylinder 18 is fixedly provided with a jack post 19, and the jack post 19 is disposed right above the transmission plate 21; the two sides of the bottom end of the first cross rod 17 are respectively provided with a first elastic connecting component 16, the first cross rod 17 is elastically connected with the rack 15 through the first elastic connecting component 16, the first elastic connecting component 16 comprises a first connecting cylinder 161, a first connecting column 162 and a first spring 163, the top end of the first connecting cylinder 161 is fixedly connected with the first cross rod 17, the bottom end of the first connecting column 162 is fixedly connected with the rack 15, the top end of the first connecting column 162 stretches into the first connecting cylinder 161, the first connecting column 162 is in sliding fit with the first connecting cylinder 161, the first connecting column 162 is elastically connected with the first connecting cylinder 161 through the first spring 163, the top of the side wall of the first connecting column 162 is fixedly provided with a limiting block 164, and the inner wall of the first connecting cylinder 161 is provided with a limiting groove, and the limiting block 164 is slidably arranged in the limiting groove so as to limit the first connecting column 162 and prevent the first connecting column 162 from rotating; during punching, the output end of the control cylinder 18 is output, thereby driving the first cross rod 17 and the second cross rod 22 to move downwards, the first cross rod 17 drives the first elastic connection assembly 16 to move downwards when moving downwards, thereby driving the rack 15 to move downwards, the rack 15 drives the rotating shaft 12 to rotate through the third gear 14, the second gear 13 is driven to rotate when the rotating shaft 12 rotates, the second gear 13 drives the first gear 11 to rotate when rotating, thereby driving the screw rod 9 to rotate, the driving seat 8 is driven to move when the screw rod 9 rotates, thereby driving the sealing plate 6 to move through the connecting plate 7, the two sealing plates 6 are separated, meanwhile, the output end of the cylinder 18 drives the top column 19 to move downwards, when the top column 19 contacts with the driving plate 21, the distance between the two sealing plates 6 is enough for the punch 5 to pass through, at the moment, the driving plate 21 drives the lifting plate 3 to move downwards through the connecting rod 20, thereby driving the punch 5 to punch a hole, and during the movement of the punch 5, the first elastic connection assembly 16 integrally contracts, and the sealing plate 6 cannot move during the process.

In this embodiment, preferably, the second elastic connection assembly 23 further includes a second connection post 231 and a second spring 233, the top end of the second connection post 231 is fixedly connected with the second cross bar 22, the bottom end of the second connection post 231 extends into the second connection cylinder 232, the second connection cylinder 232 is internally provided with the second spring 233, and the second connection post 231 is elastically connected with the second connection cylinder 232 through the second spring 233; through the arrangement of the second elastic connecting component 23, on one hand, when the output end of the air cylinder 18 is contracted, the second cross rod 22 can drive the movable mould 2 to move upwards through the second elastic connecting component 23, on the other hand, when the mould is closed, the second spring 233 is in a compressed state, the first spring 163 is in a stretched state, and at the moment, the second spring 233 can provide pressure for the movable mould 2 through the second connecting cylinder 232, so that the movable mould 2 can be pressed on the fixed mould 1, and the stability during mould closing is ensured; through the setting of first elastic connection subassembly 16, second elastic connection subassembly 23, jack-prop 19 and drift 5 for cylinder 18 not only can drive movable mould 2 and remove and carry out the compound die and open the mould, can also drive shrouding 6 and drift 5 and remove, and each process is gone on in stages, can not produce the interference, has reduced the cost of device, and has improved the synchronism, has reduced the error.

Referring to fig. 6 and 7, in the embodiment of the present invention, a second mounting cavity 102 is provided in the inside of the fixed mold 1, a male mold is provided at the top end of the fixed mold 1, the male mold includes a mold frame 101 and a mold core 26, the mold core 26 is slidably disposed in the mold frame 101, the mold frame 101 is fixedly mounted at the top end of the fixed mold 1, a fourth spring 27 is provided in the second mounting cavity 102, the top end of the fourth spring 27 is connected with the bottom wall of the mold core 26, the bottom end of the fourth spring 27 is connected with the bottom inner wall of the second mounting cavity 102, and a stop assembly for supporting the mold core 26 is disposed on the fixed mold 1; the side wall of the mold core 26 is fixedly provided with a second sliding block 32, and the second sliding block 32 is in sliding connection with the fixed mold 1, so that the sliding range of the mold core 26 is limited.

In this embodiment, preferably, the stop assembly includes a locking plate 28, a push plate 29 and a tension spring 30, in the injection molding process, the top wall of the locking plate 28 is attached to the bottom wall of the mold core 26, and the locking plate 28 is in sliding fit with the fixed mold 1, one end of the locking plate 28 is fixedly connected with the push plate 29, one end of the tension spring 30 is connected with the fixed mold 1, the other end of the tension spring 30 is connected with the push plate 29, the side wall of the fixed mold 1 is fixedly provided with a stop post 31, two stop assemblies are provided, the two stop assemblies are respectively arranged at two sides of the fixed mold 1, and when the mold is closed, the two connecting plates 7 are positioned between the two push plates 29; through the setting of locking plate 28 for the in-process of moulding plastics can lock to mould core 26, the hydraulic pressure during moulding plastics can't promote mould core 26 and move downwards, and in the punching process, along with two connecting plates 7 keep away from each other, two push pedal 29 keep away from each other, thereby drive two locking plates 28 keep away from each other, thereby make locking plate 28 release the locking to mould core 26, thereby make the in-process of punching a hole, mould core 26 can move downwards, the in-process of punching a hole, the limit portion of injection molding is supported by mould frame 101, the waste material that drift 5 cut promotes mould core 26 and moves downwards, thereby guarantee sufficient punching space, in order to guarantee the punching quality, during the die sinking, under the effect of extension spring 30, two push pedal 29 are close to each other, thereby make locking plate 28 move to the below of mould core 26 again, in order to realize the reset of mould core 26.

In the process of opening the mold, before the movable mold 2 and the fixed mold 1 are separated, under the action of the elastic force of the fourth spring 27, the mold core 26 has a pressure on the injection molding product and the punched waste, so that when the punch 5 moves upwards to reset, the pressure on the plastic product by the mold core 26 may cause the plastic product to be ejected between the two sealing plates 6, and in order to solve this technical problem, the following embodiment is provided.

Referring to fig. 3, 8 and 9, in the embodiment of the present invention, a third mounting cavity is formed in the fixed mold 1, a first slider 33 is slidably mounted in the third mounting cavity, one side of the first slider 33 is fixedly connected with a unidirectional locking block 34, the other side of the first slider 33 is connected with a fifth spring 35, the first slider 33 is elastically connected with an inner side wall of the third mounting cavity through the fifth spring 35, one end of the unidirectional locking block 34 extends into the third mounting cavity, a plurality of locking grooves 2601 are formed in a side wall of the mold core 26, the unidirectional locking block 34 is adapted to the locking grooves 2601, a first magnetic block 36 is disposed at a bottom of the first slider 33, a second magnetic block 37 is disposed at a top of the locking plate 28, the first magnetic block 36 is magnetically attracted with the second magnetic block 37, and the mold core 26 can move downward and cannot move upward when the unidirectional locking block 34 is inserted into the locking grooves 2601; the above structure can be provided with two groups, when the two connection plates 7 push the two push plates 29 to move away from each other, the two locking plates 28 move away from each other, so as to release the stop of the mold core 26, when the locking plates 28 move, the second magnetic block 37 is driven to move, so that the second magnetic block 37 moves away from the first magnetic block 36, so that the first magnetic block 36 loses the attractive force of the second magnetic block 37, at this time, under the elastic action of the fifth spring 35, the first slider 33 drives the unidirectional locking block 34 to move towards the mold core 26 and press in the locking groove 2601, thereby unidirectional locking the mold core 26, so that the mold core 26 can move downwards in the punching process, after the punching is completed, the two push plates 29 are driven to move away from each other along with the mutual distance of the two connection plates 7, and before the end distance of the locking plates 28 just starts to move, that is, the attractive force of the second magnetic block 37 to the first magnetic block 36 is insufficient to move out the end of the unidirectional locking block 34 from the locking groove 2601, the unidirectional locking block 34 cannot move upwards, and cannot generate pressure on the injection molded product, and when the unidirectional locking block 34 releases the unidirectional locking block 34 from the locking groove 26, and the two injection molded product 6 cannot enter the gap between the two sealing plates 6.

The foregoing description is only of the preferred embodiments of the invention, and all changes and modifications that come within the meaning and range of equivalency of the structures, features and principles of the invention are therefore intended to be embraced therein.

Claims

1. The utility model provides a punching device for injection mold, includes fixed mould (1), movable mould (2) and punching mechanism, its characterized in that: the punching mechanism is arranged on a movable die (2), a die cavity is formed in the bottom of the movable die (2), a first mounting cavity (201) is formed in the movable die (2), two sealing plates (6) are arranged between the die cavity and the first mounting cavity (201), one sides, close to the two sealing plates (6), of the two sealing plates are movably attached, and a transmission mechanism for driving the two sealing plates (6) to move relatively is arranged on the movable die (2);

The punching mechanism comprises a lifting plate (3), a mounting plate (4) and a punch (5), wherein the lifting plate (3) is arranged in a first mounting cavity (201) in a sliding mode, a driving mechanism used for driving the lifting plate (3) to lift is arranged above the lifting plate (3), the mounting plate (4) is detachably arranged at the bottom end of the lifting plate (3), at least one punch (5) is fixedly arranged at the bottom end of the mounting plate (4), after an injection molding product is cooled and molded, two sealing plates (6) are driven to be far away from each other through a transmission mechanism, the first mounting cavity (201) is communicated with a die cavity, and the lifting plate (3) is driven to move downwards through the driving mechanism, so that the punch (5) punches a hole on the injection molding product.

2. The punching device for an injection mold according to claim 1, characterized in that: the transmission mechanism comprises a mounting seat (10), a driving seat (8) and a screw rod (9), wherein the mounting seat (10) is fixedly arranged at the top end of a movable die (2), a connecting plate (7) is fixedly arranged on one side of a sealing plate (6), the driving seat (8) is fixedly arranged at the top end of the connecting plate (7), the screw rod (9) penetrates through the driving seat (8), the screw rod (9) is in threaded connection with the driving seat (8), the screw rod (9) penetrates through the mounting seat (10), the screw rod (9) is rotationally connected with the mounting seat (10), a first gear (11) is fixedly arranged at one end of the screw rod (9), a rotating shaft (12) is rotationally arranged on the mounting seat (10), a second gear (13) and a third gear (14) are fixedly sleeved on the rotating shaft (12), the second gear (13) is meshed with the first gear (11), the radius of the second gear (13) is larger than that of the first gear (11), so that the effect of adjusting the rotating speed is achieved, and a rack (15) is pushed by the third gear (14), and a rack (15) is meshed with the rack (15).

3. The punching device for an injection mold according to claim 2, characterized in that: the top fixed mounting of lifter plate (3) has connecting rod (20), the top fixed mounting of connecting rod (20) has drive plate (21), the both sides on movable mould (2) top are provided with second elastic connection subassembly (23), second elastic connection subassembly (23) include second connecting cylinder (232), second connecting cylinder (232) fixed mounting is in the top of movable mould (2), the fixed cover in top of second connecting cylinder (232) is equipped with spacing ring (24), second connecting cylinder (232) run through drive plate (21), and second connecting cylinder (232) and drive plate (21) sliding fit, the cover is equipped with third spring (25) on second connecting cylinder (232), drive plate (21) are through third spring (25) and the roof elastic connection of movable mould (2).

4. A punching device for an injection mold according to claim 3, characterized in that: the driving mechanism comprises an air cylinder (18), the air cylinder (18) is arranged above the movable die (2), the output end of the air cylinder (18) is fixedly connected with a first cross rod (17) and a second cross rod (22), the first cross rod (17) and the second cross rod (22) are mutually perpendicular, the output end of the air cylinder (18) is fixedly provided with a jacking column (19), and the jacking column (19) is arranged right above the transmission plate (21); the two sides of the bottom end of the first cross rod (17) are respectively provided with a first elastic connecting component (16), and the first cross rod (17) is elastically connected with the rack (15) through the first elastic connecting components (16).

5. The punching device for an injection mold according to claim 4, wherein: the second elastic connecting assembly (23) further comprises a second connecting column (231) and a second spring (233), the top end of the second connecting column (231) is fixedly connected with the second cross rod (22), the bottom end of the second connecting column (231) stretches into the second connecting cylinder (232), the second spring (233) is arranged in the second connecting cylinder (232), and the second connecting column (231) is elastically connected with the second connecting cylinder (232) through the second spring (233).

6. The punching device for an injection mold according to claim 2, characterized in that: the inside of cover half mould (1) has been seted up second installation cavity (102), the top of cover half mould (1) is provided with the terrace die, the terrace die includes mould frame (101) and mold core (26), mold core (26) slip sets up the inside at mould frame (101), mould frame (101) fixed mounting is in the top of cover half mould (1), be provided with fourth spring (27) in second installation cavity (102), the top of fourth spring (27) is connected with the diapire of mold core (26), the bottom of fourth spring (27) is connected with the bottom inner wall of second installation cavity (102), be provided with the backstop subassembly that is used for supporting mold core (26) on cover half mould (1).

7. The punching device for an injection mold according to claim 6, characterized in that: the stop assembly comprises a locking plate (28), a push plate (29) and a tension spring (30), wherein the top wall of the locking plate (28) is attached to the bottom wall of the mold core (26) in the injection molding process, the locking plate (28) is in sliding fit with the fixed mold (1), one end of the locking plate (28) is fixedly connected with the push plate (29), one end of the tension spring (30) is connected with the fixed mold (1), the other end of the tension spring (30) is connected with the push plate (29), a baffle column (31) is fixedly arranged on the side wall of the fixed mold (1), and two connecting plates (7) are positioned between the two push plates (29) during mold closing.

8. The punching device for an injection mold according to claim 7, characterized in that: the fixed die is characterized in that a third mounting cavity is formed in the fixed die (1), a first sliding block (33) is slidably mounted in the third mounting cavity, one side of the first sliding block (33) is fixedly connected with a one-way locking block (34), the other side of the first sliding block (33) is connected with a fifth spring (35), the first sliding block (33) is elastically connected with the inner side wall of the third mounting cavity through the fifth spring (35), one end of the one-way locking block (34) stretches into the third mounting cavity, a plurality of locking grooves (2601) are formed in the side wall of the die core (26), the one-way locking block (34) is matched with the locking grooves (2601), a first magnetic block (36) is arranged at the bottom of the first sliding block (33), a second magnetic block (37) is arranged at the top of the locking plate (28), and the first magnetic block (36) and the second magnetic block (37) are magnetically attracted.

9. The punching device for an injection mold according to claim 4, wherein: the first elastic connection assembly (16) comprises a first connection cylinder (161), a first connection column (162) and a first spring (163), wherein the top end of the first connection cylinder (161) is fixedly connected with a first cross rod (17), the bottom end of the first connection column (162) is fixedly connected with a rack (15), the top end of the first connection column (162) stretches into the first connection cylinder (161), the first connection column (162) is in sliding fit with the first connection cylinder (161), the first spring (163) is arranged in the first connection cylinder (161), and the first connection column (162) is in elastic connection with the first connection cylinder (161) through the first spring (163).