A shaping mold facilitating rapid demolding of plastic products

Abstract

The application discloses a shaping mold facilitating rapid demolding of plastic products, and relates to the field of injection molds.The shaping mold comprises a top mold, and has the advantages that: the spray head can be hidden in the mold, the integrity of the cavity is avoided from being affected, the injection quality is ensured, the spraying of the demolding agent and the injection of the plastic part do not interfere with each other, meanwhile, the shaping mold can independently spray the demolding agent, manual participation in all plastic injection is not needed, a mechanical arm is not needed, cost is reduced, time and labor are saved, the injection efficiency is fully improved, control programming and the use of a position sensor are not needed, the injection process is fully simplified, the risk of device damage is reduced, the maintenance cost is relatively low in the later period, the detection of mold closing is closely related to the spraying of the demolding agent, the application of the demolding agent and the mold closing detection do not need to be performed at intervals, the splashing of molten material is avoided, the safety is improved, the injection cycle is greatly shortened, and the production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of injection mold, in particular to a shaping mold facilitating rapid demolding of plastic products. BACKGROUND

[0002] In the injection molding process, spraying demolding agent is one of the key steps to help the plastic parts to be demolded smoothly. The spraying process is as follows: after selecting the appropriate demolding agent according to the material and process requirements of the plastic parts, the demolding agent is uniformly sprayed on the surface of the cavity using a spray gun or a mechanical arm. After spraying, it is left for 10-30 seconds, and then injection molding is carried out after the solvent is volatilized. In this process, the mold can be preheated to an appropriate temperature to avoid uneven spraying of the demolding agent due to low temperature condensation, and to speed up the volatilization of the demolding agent.

[0003] In the above process, the spraying of the demolding agent needs to rely on the spray gun or the mechanical arm, and cannot be completed independently by the shaping mold, so that manual intervention is required for all plastic injection molding or additional cost investment, which is time-consuming and labor-intensive, and also affects the injection molding efficiency. At the same time, the use of mechanical arm also needs to consider the control programming and the use of position sensor, which increases the control difficulty of injection molding, further increases the cost investment, and also increases the risk of device damage, and the maintenance cost is too high.

[0004] After searching, Chinese patent application CN116277770A discloses a forming device for plastic product processing. Although the mold can be smoothly separated from the plastic product during upward movement for demolding, the spraying of the demolding agent still needs the participation of the spray gun or the mechanical arm, and the demolding agent cannot be applied by the shaping mold itself. At the same time, the application of the demolding agent and the mold detection cannot be closely performed. When the mold thickness changes or the movement of the mold is not accurately adjusted, it will lead to incomplete mold closing. During subsequent injection molding, the molten material is easy to splash, which brings safety hazards. Therefore, after the mold is closed, it is necessary to detect whether the mold is completely closed. When the mold detection and the application of the demolding agent are performed step by step, the injection molding cycle is greatly prolonged, and the production efficiency is reduced. SUMMARY

[0005] The present application relates to the field of injection mold, in particular to a shaping mold facilitating rapid demolding of plastic products.

[0006] To solve the problems in the background art, the present application provides the following technical scheme: A plastic product rapid demolding forming die, comprising a top die, a sprue bushing is installed on the end face of the top die, and a fixed die is fixedly connected to the bottom surface of the top die, one end of a guide column is fixedly connected to the bottom surface of the fixed die, and the other end of the guide column is embeddedly connected with a movable die, a bottom die is fixedly connected to the bottom surface of the movable die, a cavity is formed between the movable die and the fixed die, main runners are formed in the movable die and the fixed die, demolding agent connectors are communicated at both ends of the main runners, an embedding groove is formed in the bottom surface of the cavity, a sliding groove is formed in the bottom surface of the embedding groove, a sealed cylinder is fixedly connected in the side wall of the sliding groove, a second pressure valve is installed on the outer surface of the sealed cylinder, one end of a first piston rod is slidably connected in the sealed cylinder, a sealed cavity is formed in the other end of the first piston rod, a gas guide is formed in the bottom surface of the sealed cavity, the gas guide is communicated with the sealed cylinder, a second piston rod is slidably connected in the sealed cavity, a lower sealing block and an upper sealing block are fixedly connected to the end surface of the second piston rod, an exhaust steel is fixedly connected to the end surface of the cavity, one end of a main exhaust is communicated with the bottom surface of the exhaust steel, the other end of the main exhaust is communicated with a one-way valve, and the one-way valve is fixedly connected to the end of the sealed cylinder.

[0007] As a further scheme of the present application: the demolding agent connectors are provided in two groups, one group of demolding agent connectors is fixedly connected to the side wall of the movable die, and the other group of demolding agent connectors is fixedly connected to the side wall of the fixed die, the embedding groove is provided in an L shape, the lower sealing block and the upper sealing block are slidably connected to the embedding groove, the first piston rod is provided in an L shape and slidably connected to the sliding groove, the one-way valve blocks the gas in the sealed cylinder from being discharged, and the second pressure valve blocks the external gas from flowing into the sealed cylinder.

[0008] As a further scheme of the present application: a first expansion cavity is formed in the inner surface of the main runner, a first plug is slidably connected in the first expansion cavity, a first supporting spring is fixedly connected between the end surface of the first plug and the end surface of the first expansion cavity, a ring channel is formed in the side wall of the first expansion cavity, the ring channel is communicated with the neck of the first expansion cavity at both ends, an air outlet is communicated between the ring channel and the sealed cylinder, a sliding channel and a first inner cavity are formed in the movable die and the fixed die, a first branch channel is communicated between the end surface of the first inner cavity and the ring channel, a secondary exhaust is communicated between the end of the first inner cavity and the main exhaust, a first pressure valve is installed in the secondary exhaust, a first diaphragm is fixedly connected to the side wall of the first inner cavity, a sliding frame is fixedly connected to the side wall of the first diaphragm, a first block and a second block are fixedly connected to the end surface of the sliding frame, and a sealing sleeve is fixedly connected to the outer surface of the first block.

[0009] As a further scheme of the present application: the sliding frame is provided in a T shape and slidably connected to the sliding channel, the first block is slidably connected to the main exhaust, and the moving direction of the first block is perpendicular to the central axis of the main exhaust.

[0010] As a further scheme of the present application, the sealing sleeve seals the gap between the first blocking and the main exhaust passage, the second blocking is sleeved with the exhaust passage sliding sleeve, and the moving direction of the second blocking is perpendicular to the central axis of the exhaust passage.

[0011] As a further scheme of the present application, the movable mold and the fixed mold are both provided with a second expansion cavity, an air inlet passage and a second inner cavity, one end of the second expansion cavity is communicated with the sliding groove, the other end of the second expansion cavity is communicated with the air inlet passage, and the end of the air inlet passage is fixedly connected with a passage connector, the second expansion cavity is sleeved with a second plug, the end surface of the second plug and the end surface of the second expansion cavity are fixedly connected with a second supporting spring, the second inner cavity is communicated with the second expansion cavity through a second branch, one end of the main flow passage is communicated with a sub-flow passage, the other end of the sub-flow passage is communicated with a ring cavity, the inner surface of the ring cavity is communicated with a nozzle, the movable mold and the fixed mold are both provided with a sliding cavity, the sliding cavity is communicated with the sub-flow passage, the side wall of the second inner cavity is fixedly connected with a second diaphragm, the side wall of the second diaphragm is fixedly connected with a third blocking, the fixed mold is provided with an injection molding flow passage, and the fixed mold is provided with a limiting groove, the limiting groove is sleeved with an inclined block, the inclined block and the limiting groove are fixedly connected with a reset spring, and the side wall of the inclined block is fixedly connected with a baffle.

[0012] As a further scheme of the present application, the central axis of the sliding cavity is perpendicular to the central axis of the sub-flow passage, the third blocking is sleeved with the sliding cavity, and the air inlet passage is not communicated with the main flow passage.

[0013] As a further scheme of the present application, the ring cavity is sleeved with the top end of the embedding groove, the nozzle is provided with a plurality of nozzles, and the plurality of nozzles are uniformly distributed about the central axis of the air inlet passage, and the baffle is sleeved with the injection molding flow passage.

[0014] By adopting the above technical scheme, compared with the prior art, the present application has the following beneficial effects:

[0015] The application makes the first skin plug in the first expansion cavity extrude the release agent, so that the first skin plug overcomes the resistance of the first supporting spring and translates, thereby opening the narrow end of the first expansion cavity, so that the release agent flows at high speed at the narrow end of the first expansion cavity, according to the Venturi effect, the pressure at the narrow end of the first expansion cavity is reduced, in order to restore the balance of the pressure, the narrow end of the first expansion cavity sucks the air in the annular channel, at this time, the second blockage closes the air outlet channel, so that the annular channel can only suck the air in the first inner cavity through the first branch, so that the air pressure at both ends of the first inner cavity is unbalanced, thereby making the first diaphragm concave, so that the carriage on the first diaphragm translates, and then the carriage drives the first blockage and the second blockage to translate, so that the bottom end of the main air outlet channel is sealed, and the air outlet channel is unobstructed, with the continuous circulation of the release agent in the main flow channel, according to the above principle, the annular channel continuously sucks the air, and at this time, the air outlet channel is unobstructed, so that the annular channel sucks the air in the sealed cylinder through the air outlet channel, because the sealed cavity is communicated with the sealed cylinder through the air guide channel, the air pressure in the sealed cavity is reduced, thereby making the second piston rod and the lower block lower, so that the lower block moves to the bottom end of the embedding groove, at this time, the embedding groove releases the restriction on the lower block and the first piston rod, with the continuous reduction of the air in the sealed cylinder, the first piston rod is further contracted and drives the lower block to translate, so as to open the embedding groove, so that the nozzle on the annular cavity is communicated with the mold cavity, and the above-mentioned can make the nozzle hidden in the mold, avoiding affecting the integrity of the mold cavity, thereby ensuring the injection molding quality, so that the spraying of the release agent and the injection molding of the plastic part do not interfere with each other.

[0016] The application makes the second skin plug driven by the gas rise against the resistance of the second supporting spring, thereby opening the narrow end of the second expansion cavity, so that the gas flows at high speed from the narrow end of the second expansion cavity, and enters the mold cavity through the chute and the embedding groove, at the same time, the negative pressure is formed at the narrow end of the second expansion cavity, so that the narrow end of the second expansion cavity sucks the air in the second branch, and further sucks the air at the end of the second inner cavity, so that the air pressure at both ends of the second inner cavity is unbalanced, thereby making the second diaphragm concave, so that the third blockage on the second diaphragm translates, thereby making the auxiliary flow channel unobstructed, so that the release agent can flow into the annular cavity through the auxiliary flow channel from the main flow channel, and supply liquid to the nozzle, so that the nozzle sprays the release agent, and the gas flowing in through the air inlet channel is fully dispersed, forming uniform spray, so that the mold cavity can be uniformly covered with the release agent, achieving the purpose of self-spraying release agent for the shaping mold, without manual participation in all plastic injection molding, and without the use of mechanical arm, reducing the cost, saving time and effort, and fully improving the injection efficiency, without considering the control programming and the use of position sensor, fully simplifying the injection process, reducing the risk of device damage, and the later maintenance cost is also lower.

[0017] When the gas pressure between the exhaust steel and the first pressure valve reaches the preset value, the first pressure valve is opened, thereby unblocking the auxiliary exhaust channel, making the gas pressure at the end of the first inner cavity recover, and further making the first diaphragm, the slide, the first blockage and the second blockage reset, making the main exhaust channel unblocked again, and the gas outlet channel resealed. At this time, the liquid supply system stops supplying liquid, so that the high-pressure gas in the cavity can enter the sealed cylinder through the main exhaust channel and the one-way valve. At this time, the lower sealing block is limited by the embedding groove and cannot rise, so that the gas pressure in the sealed cylinder rises first to reset the first piston rod, and then resets the lower sealing block. At this time, the pressure in the sealed cylinder reaches the initial value. If the gas during injection enters the sealed cylinder through the above path, the second pressure valve is opened under pressure and discharges the amount of gas just entered, avoiding affecting the exhaust during injection. The above process is the case of precise mold closing. If the fixed mold and the movable mold are not fully closed, the gas pressure in the cavity cannot be raised, and the system cannot be reset, so that the lower sealing block and the upper sealing block cannot be reset, so that the upper sealing block cannot press the inclined surface of the inclined block, so that the inclined block cannot be retracted into the limiting groove and compress the reset spring, so that the baffle always seals the injection channel, so that the injection cannot be completed, and the purpose of mold closing detection is achieved. The detection of mold closing is closely related to the spraying of the release agent, so that the application of the release agent and the mold closing detection do not need to be performed at intervals, avoiding the splashing of the molten material, improving the safety, greatly shortening the injection cycle, and improving the production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a whole structure schematic diagram of the molding mold for facilitating rapid demolding of plastic products according to the present application;

[0019] Figure 2 It is a cavity structure schematic diagram in the embodiment of the present application;

[0020] Figure 3 It is a movable mold structure half-section schematic diagram in the embodiment of the present application;

[0021] Figure 4 It is a first piston rod structure sectional view in the embodiment of the present application Figure 3 A part structure enlarged view in the embodiment of the present application;

[0022] Figure 5 It is a B part structure enlarged view in the embodiment of the present application; Figure 3

[0023] Figure 6 It is a first piston rod structure sectional view in the embodiment of the present application

[0024] Figure 7 It is a C part structure enlarged view in the embodiment of the present application; Figure 6

[0025] Figure 8 It is an upper sealing block structure schematic diagram in the embodiment of the present application; ​​

[0026] Figure 9 This is a schematic diagram of the baffle structure in an embodiment of the present invention.

[0027] In the diagram: 1. Top mold; 2. Sprue bushing; 3. Fixed mold; 4. Guide pillar; 5. Moving mold; 6. Bottom mold; 7. Cavity; 8. Main runner; 9. Release agent connector; 10. Groove; 11. Slide groove; 12. Sealed cylinder; 13. First piston rod; 14. Air duct; 15. Sealed cavity; 16. Second piston rod; 17. Lower sealing block; 18. First expansion cavity; 19. First support spring; 20. First plug; 21. Ring runner; 22. Air outlet; 23. First inner cavity; 24. First branch runner; 25. Secondary exhaust duct; 26. Main exhaust duct; 27. First pressure valve; 28. 29. Exhaust steel; 30. One-way valve; 31. Slide rail; 32. First diaphragm; 33. Carriage; 34. First block; 35. Second block; 36. Sealing sleeve; 37. Second expansion cavity; 38. Airway connector; 39. Second plug; 40. Second support spring; 41. Second inner cavity; 42. Second branch channel; 43. Secondary flow channel; 44. Slide cavity; 45. Second diaphragm; 46. Third block; 47. Annular cavity; 48. Nozzle; 49. Injection molding flow channel; 50. Upper sealing block; 51. Restriction groove; 52. Inclined block; 53. Baffle; 54. Second pressure valve. Detailed Implementation

[0028] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding the present invention, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0029] Example 1, please refer to Figures 1-4 , Figure 6 and Figure 7The application provides a technical scheme: a shaping mold facilitating rapid demolding of plastic products, which comprises a top mold 1, a sprue bushing 2 is arranged on the end face of the top mold 1, a bottom mold 3 is fixedly connected to the bottom face of the top mold 1, one end of a guide column 4 is fixedly connected to the bottom face of the bottom mold 3, the other end of the guide column 4 is embeddedly connected with a movable mold 5, the bottom face of the movable mold 5 is fixedly connected with a bottom mold 6, a cavity 7 is arranged between the movable mold 5 and the bottom mold 3, a main runner 8 is arranged in the movable mold 5 and the bottom mold 3, demolding agent connectors 9 are arranged at the two ends of the main runner 8, an embedding groove 10 is arranged on the bottom face of the cavity 7, a sliding groove 11 is arranged on the bottom face of the embedding groove 10, a sealed cylinder 12 is fixedly connected to the side wall of the sliding groove 11, a second pressure valve 54 is arranged on the outer surface of the sealed cylinder 12, one end of a first piston rod 13 is slidably sleeved in the sealed cylinder 12, the other end of the first piston rod 13 is provided with a sealed cavity 15, a gas guide channel 14 is arranged on the bottom face of the sealed cavity 15, the gas guide channel 14 is communicated with the sealed cylinder 12, a second piston rod 16 is slidably sleeved in the sealed cavity 15, a lower sealing block 17 and an upper sealing block 50 are fixedly connected to the end face of the second piston rod 16, an exhaust steel 28 is fixedly connected to the end face of the cavity 7, one end of a main exhaust channel 26 is communicated with the bottom face of the exhaust steel 28, the other end of the main exhaust channel 26 is communicated with a one-way valve 29, and the one-way valve 29 is fixedly connected to the end of the sealed cylinder 12.

[0030] Please refer to Figure 1 、 Figure 4 、 Figure 6 and Figure 8 , the demolding agent connectors 9 are provided with two groups, one group of the demolding agent connectors 9 is fixedly connected to the side wall of the movable mold 5, the other group of the demolding agent connectors 9 is fixedly connected to the side wall of the bottom mold 3, the embedding groove 10 is arranged in an L shape, the lower sealing block 17 and the upper sealing block 50 are slidably sleeved with the embedding groove 10, the first piston rod 13 is arranged in an L shape and slidably sleeved with the sliding groove 11, the one-way valve 29 blocks the gas in the sealed cylinder 12 from being discharged, and the second pressure valve 54 blocks the external gas from flowing into the sealed cylinder 12.

[0031] Specifically, in the process of opening the slot 10, the release agent is introduced into the main flow channel 8 by the liquid supply system, and the first skin plug 20 in the first expansion cavity 18 is extruded, so that the first skin plug 20 overcomes the resistance of the first supporting spring 19 and translates, thereby opening the narrow end of the first expansion cavity 18, so that the release agent flows at high speed at the narrow end of the first expansion cavity 18, according to the Venturi effect, the pressure at the narrow end of the first expansion cavity 18 is reduced, in order to restore the balance of pressure, the narrow end of the first expansion cavity 18 draws air in the annular channel 21, at this time the second blockage 34 closes the air outlet channel 22, so that the annular channel 21 can only suck air in the first inner cavity 23 through the first branch channel 24, so that the air pressure at both ends of the first inner cavity 23 is unbalanced, thereby causing the first diaphragm 31 to sag, so that the carriage 32 on the first diaphragm 31 translates, and further causes the carriage 32 to drive the first blockage 33 and the second blockage 34 to translate, so that the bottom end of the main air outlet channel 26 is sealed, while the air outlet channel 22 is open. With the continuous circulation of the release agent in the main flow channel 8, according to the above principle, the annular channel 21 continuously sucks air, and at this time the air outlet channel 22 is open, so that the annular channel 21 sucks air in the closed cylinder 12 through the air outlet channel 22. Since the closed cavity 15 is connected to the closed cylinder 12 through the air guide channel 14, the air pressure in the closed cavity 15 decreases, thereby causing the second piston rod 16 and the lower sealing block 17 to descend, so that the lower sealing block 17 moves to the bottom end of the slot 10. At this time, the restriction of the slot 10 on the lower sealing block 17 and the first piston rod 13 is removed. With the continuous reduction of air in the closed cylinder 12, the first piston rod 13 is further retracted and drives the lower sealing block 17 to translate, achieving the purpose of opening the slot 10, so that the spray head 48 on the annular cavity 47 is connected to the cavity 7. As described above, the spray head 48 can be hidden in the mold to avoid affecting the integrity of the cavity 7, thereby ensuring the injection quality, so that the spraying of the release agent does not interfere with the injection of the plastic part.

[0032] Example 2, please refer to Figure 3 and Figure 4The application provides a technical scheme: a plastic product rapid demolding forming die, a first cavity 18 is arranged on the inner surface of the main runner 8, a first plug 20 is slidably sleeved in the first cavity 18, a first supporting spring 19 is fixedly connected between the end surface of the first plug 20 and the end surface of the first cavity 18, a ring channel 21 is arranged in the side wall of the first cavity 18, the two ends of the ring channel 21 are communicated with the neck of the first cavity 18, a gas outlet 22 is communicated between the ring channel 21 and the sealing cylinder 12, a slide channel 30 and a first inner cavity 23 are arranged in the movable die 5 and the fixed die 3, a first branch channel 24 is communicated between the end surface of the first inner cavity 23 and the ring channel 21, a secondary exhaust channel 25 is communicated between the end of the first inner cavity 23 and the main exhaust channel 26, a first pressure valve 27 is installed in the secondary exhaust channel 25, a first diaphragm 31 is fixedly connected to the side wall of the first inner cavity 23, a sliding frame 32 is fixedly connected to the side wall of the first diaphragm 31, a first block 33 and a second block 34 are fixedly connected to the end surface of the sliding frame 32, and a sealing sleeve 35 is fixedly connected to the outer surface of the first block 33.

[0033] Please refer to Figure 4 The sliding frame 32 is arranged in a T shape, the sliding frame 32 is slidably sleeved with the slide channel 30, the first block 33 is slidably sleeved with the main exhaust channel 26, and the moving direction of the first block 33 is perpendicular to the central axis of the main exhaust channel 26.

[0034] Please refer to Figure 4 The sealing sleeve 35 seals the gap between the main exhaust channel 26 and the first block 33, the second block 34 is slidably sleeved with the gas outlet 22, and the moving direction of the second block 34 is perpendicular to the central axis of the gas outlet 22.

[0035] Specifically, in the process of pressurizing the air inlet channel 37, the gas pushes the second piston 39, the second piston 39 rises against the resistance of the second supporting spring 40, thereby opening the narrow end of the second expansion cavity 36, so that the gas accelerates from the narrow end of the second expansion cavity 36 and flows through the sliding groove 11 and the embedded groove 10 into the cavity 7, at the same time, the negative pressure is formed at the narrow end of the second expansion cavity 36, so that the narrow end of the second expansion cavity 36 sucks the air in the second branch channel 42, further sucks the air at the end of the second inner cavity 41, so that the air pressure at both ends of the second inner cavity 41 is unbalanced, thereby making the second diaphragm 45 concave, making the third blockage 46 on the second diaphragm 45 translate, and further making the auxiliary flow channel 43 unobstructed, so that the release agent can flow into the annular cavity 47 from the main flow channel 8 through the auxiliary flow channel 43, and supply liquid to the nozzle 48, so that the nozzle 48 sprays the release agent, and the gas flowing from the air inlet channel 37 is fully dispersed to form uniform spray, so that the cavity 7 can be uniformly covered with the release agent, achieving the purpose of self-spraying release agent for the sizing mold, without manual participation in all plastic injection, without the use of mechanical arm, reducing the cost, saving time and effort, while fully improving the injection efficiency, without considering the control programming and the use of position sensor, fully simplifying the injection process, reducing the risk of device damage, and the maintenance cost is also lower.

[0036] Embodiment 3, please refer to Figure 3 and Figures 5-9 The application provides a technical scheme: a sizing mold facilitating rapid demolding of plastic products, the movable mold 5 and the fixed mold 3 are both provided with a second expansion cavity 36, an air inlet channel 37 and a second inner cavity 41, one end of the second expansion cavity 36 is communicated with the sliding groove 11, the other end of the second expansion cavity 36 is communicated with the air inlet channel 37, and the end of the air inlet channel 37 is fixedly connected with an air channel connector 38, the second expansion cavity 36 is slidably sleeved with a second piston 39, the end surface of the second piston 39 and the end surface of the second expansion cavity 36 are fixedly connected with a second supporting spring 40, the second inner cavity 41 is communicated with the narrow end of the second expansion cavity 36 through a second branch channel 42, one end of the main flow channel 8 is communicated with an auxiliary flow channel 43, the other end of the auxiliary flow channel 43 is communicated with an annular cavity 47, the inner surface of the annular cavity 47 is communicated with a nozzle 48, the movable mold 5 and the fixed mold 3 are both provided with a sliding cavity 44, the sliding cavity 44 is communicated with the auxiliary flow channel 43, the side wall of the second inner cavity 41 is fixedly connected with a second diaphragm 45, the side wall of the second diaphragm 45 is fixedly connected with a third blockage 46, the fixed mold 3 is provided with an injection flow channel 49, and the fixed mold 3 is provided with a limiting groove 51, the limiting groove 51 is slidably sleeved with an inclined block 52, the inclined block 52 and the limiting groove 51 are fixedly connected with a reset spring, and the side wall of the inclined block 52 is fixedly connected with a baffle 53.

[0037] Please refer to Figure 5 , the central axis of the sliding cavity 44 is perpendicular to the central axis of the auxiliary flow channel 43, the third blockage 46 is slidably sleeved with the sliding cavity 44, and the air inlet channel 37 is not communicated with the main flow channel 8.

[0038] Referring to Figure 6 and Figures 7-9 The ring cavity 47 is sleeved with the top end of the embedding groove 10, the spray head 48 is provided with a plurality of spray heads 48, and the plurality of spray heads 48 are evenly stepped about the central axis of the air inlet 37, and the baffle 53 is slidingly sleeved with the injection flow channel 49.

[0039] Specifically, in the process of the release agent spraying, the air pressure in the cavity 7 is raised, so that the air pressure between the exhaust steel 28 and the first pressure valve 27 is raised, when the pressure value reaches the preset value of the first pressure valve 27, the first pressure valve 27 is opened, so that the auxiliary exhaust channel 25 is unblocked, the air pressure at the end of the first inner cavity 23 is raised, and then the first diaphragm 31, the slide 32, the first blockage 33 and the second blockage 34 are reset, so that the main exhaust channel 26 is unblocked again, and the air outlet 22 is resealed. At this time, the liquid supply system stops supplying liquid, so that the high-pressure gas in the cavity 7 can enter the sealed cylinder 12 through the main exhaust channel 26 and the one-way valve 29, at this time, the lower sealing block 17 is limited by the embedding groove 10 and cannot be raised, so that the air pressure in the sealed cylinder 12 is raised first to reset the first piston rod 13, and then to reset the lower sealing block 17. At this time, the pressure in the sealed cylinder 12 reaches the initial value, if the gas during injection enters the sealed cylinder 12 through the above-mentioned path, the second pressure valve 54 is opened under pressure and discharges the amount of gas just entered, avoiding affecting the exhaust during injection. The above process is the case of precise mold closing, if the mold 3 and the mold 5 are not fully closed, the air pressure in the cavity 7 cannot be raised, the system cannot be reset, and thus the lower sealing block 17 and the upper sealing block 50 cannot be reset, so that the upper sealing block 50 cannot extrude the inclined surface of the inclined block 52, so that the inclined block 52 cannot be retracted into the limiting groove 51 and compress the reset spring, so that the baffle 53 always seals the injection flow channel 49, so that the injection cannot be completed, and the purpose of mold closing detection is achieved. The detection of mold closing is closely related to the spraying of release agent, so that the application of release agent and mold closing detection do not need to be performed separately, avoiding the splashing of molten material, improving safety, at the same time, greatly shortening the injection cycle and improving production efficiency.

[0040] The working principle and use process of the present application: when the plastic product needs to be injection molded, the top die 1 and the bottom die 6 are fixed on the injection molding machine using high-strength bolts, and the demolding agent joint 9 on the movable die 5 and the fixed die 3 is connected with the liquid supply system, and the air passage joint 38 is connected with the gas supply system at the same time. At this time, the injection molding machine is started, so that the movable die 5 and the fixed die 3 are closed, and the cavity 7 is closed. Then the demolding agent is introduced into the main runner 8 through the liquid supply system, and the first skin plug 20 in the first expansion cavity 18 is extruded, so that the first skin plug 20 overcomes the resistance of the first supporting spring 19 and translates, thereby opening the neck end of the first expansion cavity 18, so that the demolding agent flows at the neck end of the first expansion cavity 18. According to the Venturi effect, the pressure at the neck end of the first expansion cavity 18 is reduced, and the first expansion cavity 18 at the neck end draws air from the annular channel 21. At this time, the second blockage 34 closes the air outlet channel 22, so that the annular channel 21 can only absorb air from the first inner cavity 23 through the first branch channel 24, so that the air pressure at both ends of the first inner cavity 23 is unbalanced, thereby causing the first diaphragm 31 to be concave, so that the carriage 32 on the first diaphragm 31 translates, thereby causing the carriage 32 to drive the first blockage 33 and the second blockage 34 to translate, so that the bottom end of the main air outlet channel 26 is sealed, and the air outlet channel 22 is unobstructed. With the continuous circulation of the demolding agent in the main runner 8, according to the above principle, the annular channel 21 continuously absorbs air, and at this time the air outlet channel 22 is unobstructed, so that the annular channel 21 absorbs air from the closed cylinder 12 through the air outlet channel 22. Because the closed cavity 15 is connected with the closed cylinder 12 through the air guide channel 14, the air pressure in the closed cavity 15 decreases, thereby causing the second piston rod 16 and the lower sealing block 17 to descend, so that the lower sealing block 17 moves to the bottom end of the embedding groove 10. At this time, the embedding groove 10 releases the restriction of the lower sealing block 17 and the first piston rod 13. With the continuous reduction of air in the closed cylinder 12, the first piston rod 13 is retracted and drives the lower sealing block 17 to translate, thereby achieving the purpose of opening the embedding groove 10, so that the nozzle 48 on the annular cavity 47 is connected with the cavity 7. As described above, the nozzle 48 can be hidden in the mold to avoid affecting the integrity of the cavity 7, thereby ensuring the injection molding quality, so that the spraying of the demolding agent does not interfere with the injection molding of the plastic part.

[0041] When the above-mentioned slot 10 is opened, the gas supplied by the gas supply system to the gas inlet 37 pushes the second piston 39, so that the second piston 39 rises against the resistance of the second supporting spring 40, thereby opening the narrow end of the second expansion chamber 36, so that the gas accelerates from the narrow end of the second expansion chamber 36, passes through the chute 11 and the slot 10 into the cavity 7, at the same time, the negative pressure is formed at the narrow end of the second expansion chamber 36, so that the narrow end of the second expansion chamber 36 sucks the air in the second branch 42, further sucks the air at the end of the second inner cavity 41, so that the air pressure at both ends of the second inner cavity 41 is unbalanced, thereby making the second diaphragm 45 concave, so that the third block 46 on the second diaphragm 45 is translated, thereby making the auxiliary flow channel 43 unobstructed, so that the release agent can flow into the annular cavity 47 from the main flow channel 8 through the auxiliary flow channel 43, and supply the nozzle 48 with liquid, so that the nozzle 48 sprays the release agent, and the gas flowing from the gas inlet 37 fully disperses the release agent to form uniform spray, so that the cavity 7 can be uniformly covered with the release agent, achieving the purpose of self-spraying release agent for the mold, without the need for manual participation in all plastic injection, and without the need for the use of mechanical arm, reducing the cost, saving time and effort, while fully improving the injection efficiency, without the need to consider the control programming and the use of position sensor, fully simplifying the injection process, reducing the risk of device damage, and the maintenance cost is also lower;

[0042] With the spraying of the release agent and the entry of the gas, the air pressure in the cavity 7 is raised, and the air pressure between the exhaust steel 28 and the first pressure valve 27 is raised. When the pressure value reaches the preset value of the first pressure valve 27, the first pressure valve 27 is opened, thereby unblocking the auxiliary exhaust channel 25, so that the air pressure at the end of the first inner cavity 23 is restored, and the first diaphragm 31, the slide 32, the first blockage 33 and the second blockage 34 are reset, so that the main exhaust channel 26 is re-opened, and the air outlet channel 22 is re-sealed. At this time, the liquid supply system stops supplying liquid, so that the high-pressure gas in the cavity 7 can enter the sealed cylinder 12 through the main exhaust channel 26 and the one-way valve 29. At this time, the lower sealing block 17 is limited by the slot 10 and cannot rise, so that the air pressure in the sealed cylinder 12 is restored to push the first piston rod 13 back to its original position, and then push the lower sealing block 17 back to its original position. At this time, the pressure in the sealed cylinder 12 reaches the initial value. If the gas during injection enters the sealed cylinder 12 through the above-mentioned path, the second pressure valve 54 is opened under pressure and discharges the amount of gas just entered, avoiding affecting the exhaust during injection. The above-mentioned process is the case of precise mold closing. If the mold 3 and the mold 5 are not fully closed, the air pressure in the cavity 7 cannot be raised, and the system cannot be reset, so that the lower sealing block 17 and the upper sealing block 50 cannot be reset, so that the upper sealing block 50 cannot press the inclined surface of the inclined block 52, so that the inclined block 52 cannot be retracted into the limiting groove 51 and compress the reset spring, so that the baffle 53 always seals the injection channel 49, so that the injection cannot be completed, and the purpose of mold closing detection is achieved. The detection of mold closing is closely related to the spraying of the release agent, so that the application of the release agent and the mold closing detection do not need to be performed separately, avoiding the splashing of the molten material, improving the safety, greatly shortening the injection cycle, and improving the production efficiency. The operation is completed.

[0043] The embodiments of the present application are described in detail above with reference to the drawings, but the present application is not limited to the described embodiments. For those skilled in the art, various changes, modifications, replacements and variations of the embodiments can be made without departing from the principles and spirits of the present application, and still fall within the protection scope of the present application.

Claims

1. A shaping mold for facilitating quick demolding of a plastic product, characterized by, The utility model provides a mould, including top mould (1), the end surface of top mould (1) is installed with sprue bushing (2), and the bottom surface of top mould (1) is fixed with fixed mould (3), one end of the bottom surface of fixed mould (3) is fixed with guide pillar (4), and the other end of guide pillar (4) is embeddedly connected with movable mould (5), the bottom surface of movable mould (5) is fixed with bottom mould (6), and the movable mould (5) and fixed mould (3) are set up cavity (7) between, the movable mould (5) and fixed mould (3) are all set up main runner (8) in, the both ends of main runner (8) are communicated with demoulding agent connector (9), the bottom surface of cavity (7) is set up with the slot (10), the bottom surface of slot (10) is set up with the sliding slot (11), the side wall in sliding slot (11) is fixed with the airtight cylinder (12), the outer surface of airtight cylinder (12) is installed with second pressure valve (54), and one end of first piston rod (13) is slidably sleeved in airtight cylinder (12), the other end of first piston rod (13) is set up with airtight cavity (15), the bottom surface of airtight cavity (15) is set up with gas guide (14), and gas guide (14) is communicated with airtight cylinder (12), second piston rod (16) is slidably sleeved in airtight cavity (15), the end surface of second piston rod (16) is fixed with lower closed block (17) and upper closed block (50), the end surface of cavity (7) is fixed with exhaust steel (28), one end of main exhaust passage (26) is communicated with the bottom surface of exhaust steel (28), the other end of main exhaust passage (26) is communicated with one-way valve (29), and one-way valve (29) is fixed with the end of airtight cylinder (12); One-way valve (29) blocks the gas in airtight cylinder (12) to discharge, and second pressure valve (54) blocks the gas of outside to flow into airtight cylinder (12); The inner surface of main runner (8) is set up with first expansion cavity (18), first expansion cavity (18) is slidably sleeved with first leather plug (20), and first support spring (19) is fixed between the end surface of first leather plug (20) and the end surface of first expansion cavity (18), and ring channel (21) is set up in the side wall of first expansion cavity (18), the both ends of ring channel (21) are communicated with the neck of first expansion cavity (18), and air outlet (22) is communicated between ring channel (21) and airtight cylinder (12), sliding way (30) and first inner cavity (23) are set up in movable mould (5) and fixed mould (3), first branch (24) is communicated between the end surface of first inner cavity (23) and ring channel (21), and vice exhaust passage (25) is communicated between the end of first inner cavity (23) and main exhaust passage (26), first pressure valve (27) is installed in vice exhaust passage (25), first diaphragm (31) is fixed on the side wall of first inner cavity (23), sliding carriage (32) is fixed on the side wall of first diaphragm (31), first blockage (33) and second blockage (34) are fixed on the end surface of sliding carriage (32), and sealing sleeve (35) is fixed on the outer surface of first blockage (33); The sealing sleeve (35) seals the gap between the main exhaust passage (26) and the first block (33), the second block (34) is sleeved with the exhaust passage (22) and the moving direction of the second block (34) is perpendicular to the central axis of the exhaust passage (22).

2. The mold of claim 1, wherein: The release agent joint (9) is provided with two groups, one group of release agent joint (9) is fixed with the side wall of the movable mold (5), the other group of release agent joint (9) is fixed with the side wall of the fixed mold (3), the embedded slot (10) is provided in L type, the lower closing block (17) and the upper closing block (50) are all sleeved with the embedded slot (10), the first piston rod (13) is provided in L type, and the first piston rod (13) is sleeved with the sliding slot (11).

3. The mold of claim 1, wherein: The sliding frame (32) is provided in T type, and the sliding frame (32) is sleeved with the sliding channel (30), the first block (33) is sleeved with the main exhaust passage (26), and the moving direction of the first block (33) is perpendicular to the central axis of the main exhaust passage (26).

4. The mold of claim 1, wherein: The movable mold (5) and the fixed mold (3) are provided with the second expansion cavity (36), the air inlet passage (37) and the second inner cavity (41), one end of the second expansion cavity (36) is communicated with the sliding slot (11), the other end of the second expansion cavity (36) is communicated with the air inlet passage (37), and the end of the air inlet passage (37) is fixedly connected with the air passage joint (38), the second expansion cavity (36) is sleeved with the second plug (39), the end surface of the second plug (39) and the end surface of the second expansion cavity (36) are fixedly connected with the second supporting spring (40), the second inner cavity (41) is communicated with the second expansion cavity (36) through the second branch (42) between the end surface of the second inner cavity (41) and the neck of the second expansion cavity (36), one end of the auxiliary flow passage (43) is communicated with the main flow passage (8), the other end of the auxiliary flow passage (43) is communicated with the ring cavity (47), the inner surface of the ring cavity (47) is communicated with the nozzle (48), the movable mold (5) and the fixed mold (3) are provided with the sliding cavity (44), the sliding cavity (44) is communicated with the auxiliary flow passage (43), the second inner cavity (41) is fixedly connected with the second diaphragm (45) on the side wall, the third block (46) is fixedly connected on the side wall of the second diaphragm (45), the fixed mold (3) is provided with the injection molding flow passage (49), and the fixed mold (3) is provided with the limiting groove (51) in the inside, the limiting groove (51) is sleeved with the inclined block (52), the inclined block (52) and the limiting groove (51) are fixedly connected with the reset spring, and the side wall of the inclined block (52) is fixedly connected with the baffle (53).

5. The mold of claim 4, wherein: The central axis of the sliding cavity (44) is perpendicular to the central axis of the auxiliary flow passage (43), the third block (46) is sleeved with the sliding cavity (44), and the air inlet passage (37) is not communicated with the main flow passage (8).

6. The mold of claim 4, wherein: The ring cavity (47) is sleeved with the top end of the embedded slot (10), the nozzle (48) is provided with a plurality of nozzles (48), and the plurality of nozzles (48) are uniformly distributed about the central axis of the air inlet passage (37), and the baffle (53) is sleeved with the injection molding flow passage (49).

Images