Shaping mold convenient for quick demolding of plastic product

Abstract

The invention discloses a shaping mold facilitating rapid demolding of a plastic product, and relates to the field of injection molds, the shaping mold comprises a top mold, and the shaping mold has the advantages that a spray head can be hidden in the mold, the integrity of a mold cavity is prevented from being influenced, the injection molding quality is guaranteed, spraying of a demolding agent and injection molding of a plastic part are not interfered, and the injection molding efficiency is improved. Meanwhile, the shaping mold can automatically spray a release agent, manual participation in injection molding of all plastic parts is not needed, a mechanical arm is not needed, the cost is reduced, time and labor are saved, meanwhile, the injection molding efficiency is fully improved, control programming and use of a position sensor do not need to be considered, the injection molding process is fully simplified, and the risk of device damage is reduced; the later maintenance cost is relatively low, and the detection of mold closing is closely linked with the spraying of the release agent, so that the application of the release agent and the detection of mold closing do not need to be carried out at intervals, the splashing of molten materials is avoided, the safety is improved, the injection molding period 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 setting 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 setting 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 setting 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 setting 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 sleeved in the sealed cylinder, a sealed cavity is formed in the other end of the first piston rod, a gas guide channel is formed in the bottom surface of the sealed cavity, the gas guide channel is communicated with the sealed cylinder, a second piston rod is slidably sleeved 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 channel is communicated with the bottom surface of the exhaust steel, the other end of the main exhaust channel 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 sleeved with the embedding groove, the first piston rod is provided in an L shape and slidably sleeved with 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 sleeved 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 channel 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 channel is communicated between the end of the first inner cavity and the main exhaust channel, a first pressure valve is installed in the secondary exhaust channel, 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 sleeved with the sliding channel, the first block is slidably sleeved with the main exhaust channel, and the moving direction of the first block is perpendicular to the central axis of the main exhaust channel.

[0010] As a further solution of the present invention: the sealing sleeve seals the gap between the main exhaust duct and the first blockage, the second blockage is slidably connected to the outlet duct, and the moving direction of the second blockage is perpendicular to the central axis of the outlet duct.

[0011] As a further solution of the present invention: a second expansion cavity, an air inlet and a second inner cavity are provided in the movable mold and the fixed mold, one end of the second expansion cavity is connected to the slide groove, the other end of the second expansion cavity is connected to the air inlet, and the end of the air inlet is fixedly connected to an air duct joint, a second leather plug is slidably sleeved in the second expansion cavity, a second supporting spring is fixedly connected between the end surface of the second leather plug and the end surface of the second expansion cavity, a second branch channel is connected between the end surface of the second inner cavity and the constriction of the second expansion cavity, and the main channel is connected to One end of the secondary flow channel, the other end of the secondary flow channel is connected to an annular cavity, the inner surface of the annular cavity is connected to a nozzle, a sliding cavity is provided in the movable mold and the fixed mold, the sliding cavity is connected to the secondary flow channel, a second diaphragm is fixedly connected to the side wall of the second inner cavity, a third blockage is fixedly connected to the side wall of the second diaphragm, an injection flow channel is provided on the fixed mold, and a limiting groove is provided in the fixed mold, an inclined block is slidably sleeved in the limiting groove, a return spring is fixed between the inclined block and the limiting groove, and a baffle is fixedly connected to the side wall of the inclined block.

[0012] As a further solution of the present invention: the central axis of the sliding cavity is perpendicular to the central axis of the secondary flow channel, the third obstruction is slidably connected to the sliding cavity, and the air inlet channel is not connected to the main flow channel.

[0013] As a further solution of the present invention: the annular cavity is sleeved with the top end of the embedding groove, a plurality of nozzles are provided, and the plurality of nozzles are evenly distributed about the central axis of the air inlet duct, and the baffle is slidably sleeved with the injection molding runner.

[0014] Adopting the above technical solution: Compared with the prior art, the beneficial effects of the present invention are: The present invention squeezes the first plug in the first expansion cavity through the release agent, so that the first plug overcomes the resistance of the first supporting spring and moves horizontally, thereby opening the shrinking end of the first expansion cavity, so that the release agent accelerates to flow at the shrinking end of the first expansion cavity. According to the Venturi effect, the pressure at the shrinking end of the first expansion cavity is reduced. In order to restore the pressure balance, the shrinking end of the first expansion cavity draws air in the annular channel. At this time, the second blockage closes the air outlet, so that the annular channel can only draw air in the first inner cavity through the first branch channel, causing the air pressure at both ends of the first inner cavity to be unbalanced, thereby causing the first diaphragm to be concave, causing the slide on the first diaphragm to move horizontally, and then causing the slide to drive the first blockage and the second blockage to move horizontally, so that the bottom end of the main exhaust channel is sealed, and the air outlet channel is unblocked. As the release agent in the main channel continues to Circulation, according to the above principle, the annular channel continuously absorbs air, and at this time the air outlet is unblocked, so that the annular channel absorbs the air in the closed cylinder through the air outlet. Because the closed cavity is connected with the closed cylinder through the air guide channel, the air pressure in the closed cavity drops, thereby causing the second piston rod and the lower closing block to drop, and the lower closing block moves to the bottom end of the embedding groove. At this time, the restriction of the embedding groove on the lower closing block and the first piston rod is released. As the air in the closed cylinder continues to decrease, the first piston rod contracts and drives the lower closing block to move horizontally, thereby achieving the purpose of opening the embedding groove, so that the nozzle on the annular cavity is connected with the cavity. In summary, the nozzle can be hidden in the mold to avoid affecting the integrity of the cavity, thereby ensuring the quality of injection molding, and making sure that the spraying of the release agent does not interfere with the injection molding of the plastic part.

[0015] The present invention pushes the second plug by gas, so that the second plug overcomes the resistance of the second support spring and rises, thereby opening the constriction of the second expansion cavity, so that the gas flows through the constriction of the second expansion cavity at an accelerated speed, and passes through the slide groove and the embedded groove into the mold cavity. At the same time, negative pressure is formed at the constriction of the second expansion cavity, so that the constriction of the second expansion cavity absorbs the air in the second branch channel, and further absorbs 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 causing the second diaphragm to sag, causing the third blockage on the second diaphragm to translate, and then making the secondary flow channel unblocked, so that demoulding is possible. The agent can flow from the main flow channel into the annular cavity through the secondary flow channel and supply liquid to the nozzle, so that the nozzle can spray the release agent, and the gas flowing in from the air inlet channel is fully dispersed to form a uniform spray, so that the cavity can be evenly covered by the release agent, thereby achieving the purpose of autonomous spraying of the release agent on the finalized mold. There is no need for manual participation in all plastic parts injection molding, and there is no need to use a robotic arm, which reduces costs, saves time and effort, and fully improves the injection molding efficiency. At the same time, there is no need to consider control programming and the use of position sensors, which fully simplifies the injection molding process, reduces the risk of device damage, and has low subsequent maintenance costs.

[0016] When the air pressure between the exhaust steel and the first pressure valve of the present invention reaches a preset value, the first pressure valve opens, thereby unblocking the secondary exhaust passage, causing the air pressure at the end of the first inner cavity to rise, thereby resetting the first diaphragm, the slide, the first blockage and the second blockage, so that the main exhaust passage is unblocked again and the air outlet passage is resealed. At this time, the liquid supply system stops supplying liquid, so that the high-pressure gas in the mold cavity can enter the sealed cylinder through the main exhaust passage and the one-way valve. At this time, the lower closing block is restricted by the embedded groove and cannot rise, so that the air pressure in the sealed cylinder rises, first pushing the first piston rod to reset, and then pushing the lower closing block to reset. At this time, the pressure in the sealed cylinder reaches the initial value. If the gas during injection molding enters the sealed cylinder through the above path, the second pressure valve is pressurized Open and discharge the amount of gas that has just entered to avoid affecting the exhaust during injection molding. The above process is the case of precise mold closing. If the fixed mold and the movable mold are not fully closed, the air pressure in the cavity cannot be increased and the system cannot be reset. Therefore, the lower closing block and the upper closing block cannot be reset, making it impossible for the upper closing block to squeeze the inclined surface of the inclined block, making it impossible for the inclined block to shrink into the limiting groove and compressing the reset spring, so that the baffle always seals the injection flow channel, making it impossible to complete the injection molding, achieving the purpose of mold closing self-inspection. At the same time, the mold closing detection is closely linked 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 splashing of molten material, improving safety, and greatly shortening the injection molding cycle and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of a shaping mold for facilitating rapid demoulding of plastic products according to the present invention; Figure 2 Schematic diagram of the cavity structure in an embodiment of the present invention; Figure 3 A half-section schematic diagram of the movable mold structure in an embodiment of the present invention; Figure 4 In the embodiment of the present invention Figure 3 A magnified view of the structure of part A; Figure 5 In the embodiment of the present invention Figure 3 A magnified view of the structure of part B; Figure 6 This is a cross-sectional view of the first piston rod structure in an embodiment of the present invention; Figure 7 In the embodiment of the present invention Figure 6 A magnified view of the structure of part C in the middle; Figure 8 This is a schematic diagram of the structure of the upper closing block in an embodiment of the present invention; Figure 9 Schematic diagram of the baffle structure in an embodiment of the present invention.

[0018] In the figure: 1, top mold; 2, gate bushing; 3, fixed mold; 4, guide column; 5, movable mold; 6, bottom mold; 7, cavity; 8, main channel; 9, release agent joint; 10, embedded groove; 11, slide groove; 12, closed cylinder; 13, first piston rod; 14, air guide channel; 15, closed cavity; 16, second piston rod; 17, lower closing block; 18, first expansion cavity; 19, first support spring; 20, first plug; 21, annular channel; 22, air outlet; 23, first inner cavity; 24, first branch channel; 25, auxiliary exhaust channel; 26, main exhaust channel; 27, first pressure valve; 28, Exhaust steel; 29. ​​One-way valve; 30. Slide; 31. First diaphragm; 32. Slide; 33. First blockage; 34. Second blockage; 35. Sealing sleeve; 36. Second expansion chamber; 37. Air inlet; 38. Air duct connector; 39. Second leather 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 blockage; 47. Annular cavity; 48. Nozzle; 49. Injection flow channel; 50. Upper closing block; 51. Limiting groove; 52. Bevel block; 53. Baffle; 54. Second pressure valve. DETAILED DESCRIPTION

[0019] The following is a further description of specific embodiments of the present invention in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is intended to facilitate understanding of the present invention and does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0020] Example 1, please refer to Figures 1-4 、 Figure 6 and Figure 7The present invention provides a technical solution: a shaping mold for facilitating rapid demoulding of plastic products, comprising a top mold 1, a sprue bushing 2 being mounted on the end surface of the top mold 1, a fixed mold 3 being fixedly connected to the bottom surface of the top mold 1, one end of a guide post 4 being fixedly connected to the bottom surface of the fixed mold 3, a movable mold 5 being engaged with the other end of the guide post 4, a bottom surface of the movable mold 5 being fixedly connected to a bottom mold 6, a cavity 7 being provided between the movable mold 5 and the fixed mold 3, a main flow channel 8 being provided in both the movable mold 5 and the fixed mold 3, a release agent joint 9 being connected at both ends of the main flow channel 8, an embedding groove 10 being provided on the bottom surface of the embedding groove 10, a slide groove 11 being provided on the bottom surface of the slide groove 11, a sealed cylinder 12 being fixedly connected to the side wall of the sealed cylinder 1 2 is installed with a second pressure valve 54 on the outer surface, and one end of the first piston rod 13 is slidably sleeved in the sealed cylinder 12, and a sealed chamber 15 is opened at the other end of the first piston rod 13. An air guide 14 is opened on the bottom surface of the sealed chamber 15, and the air guide 14 is communicated with the sealed cylinder 12. A second piston rod 16 is slidably sleeved in the sealed chamber 15, and a lower closing block 17 and an upper closing block 50 are fixed to the end surface of the second piston rod 16. An exhaust steel 28 is fixed to the end surface of the cavity 7, and the bottom surface of the exhaust steel 28 is communicated with one end of the main exhaust channel 26. The other end of the main exhaust channel 26 is communicated with a one-way valve 29, and the one-way valve 29 is fixed to the end of the sealed cylinder 12.

[0021] See also Figure 1 、 Figure 4 、 Figure 6 and Figure 8 There are two groups of release agent joints 9, one group of release agent joints 9 is fixedly connected to the side wall of the movable mold 5, and the other group of release agent joints 9 is fixedly connected to the side wall of the fixed mold 3. The embedding groove 10 is set in an L shape, and the lower closing block 17 and the upper closing block 50 are both slidably connected to the embedding groove 10. The first piston rod 13 is set in an L shape, and the first piston rod 13 is slidably connected to the slide groove 11. The one-way valve 29 prevents the gas in the sealed cylinder 12 from being discharged, and the second pressure valve 54 prevents external gas from flowing into the sealed cylinder 12.

[0022] Specifically, in the process of opening the embedding groove 10, the release agent is introduced into the main channel 8 through the liquid supply system, and the first plug 20 in the first expansion cavity 18 is squeezed, so that the first plug 20 overcomes the resistance of the first support spring 19 and moves horizontally, thereby opening the constricted end of the first expansion cavity 18, so that the release agent accelerates to flow at the constricted end of the first expansion cavity 18. According to the Venturi effect, the pressure at the constricted end of the first expansion cavity 18 is reduced. In order to restore the pressure balance, the constricted end of the first expansion cavity 18 draws air in the annular channel 21. At this time, the second obstruction 34 closes the air outlet 22, so that the annular channel 21 can only draw air in the first inner cavity 23 through the first branch channel 24, causing the air pressure at both ends of the first inner cavity 23 to be unbalanced, thereby causing the first diaphragm 31 to be concave, causing the slide 32 on the first diaphragm 31 to move horizontally, and then the slide 32 drives the first obstruction 33 and the second obstruction 34 to move horizontally, so that the bottom end of the main exhaust channel 26 is sealed, and the air outlet 22 is unblocked. As the release agent in the main channel 8 continues to circulate, according to the above principle, the annular channel 21 continuously absorbs air, and at this time the air outlet 22 is unblocked, so that the annular channel 21 absorbs the air in the sealed cylinder 12 through the air outlet 22. Because the sealed chamber 15 is connected to the sealed cylinder 12 through the air guide 14, the air pressure in the sealed chamber 15 drops, thereby causing the second piston rod 16 and the lower closing block 17 to descend, causing the lower closing block 17 to move to the bottom end of the embedding groove 10. At this time, the embedding groove 10 releases the restriction of the lower closing block 17 and the first piston rod 13. As the air in the sealed cylinder 12 continues to decrease, the first piston rod 13 contracts and drives the lower closing block 17 to move horizontally, thereby achieving the purpose of opening the embedding groove 10, so that the nozzle 48 on the annular cavity 47 is connected to the cavity 7. In summary, the nozzle 48 can be hidden in the mold to avoid affecting the integrity of the cavity 7, thereby ensuring the injection molding quality and ensuring that the spraying of the release agent does not interfere with the injection molding of the plastic part.

[0023] Example 2, please refer to Figure 3 and Figure 4The present invention provides a technical solution: a shaping mold that facilitates rapid demoulding of plastic products, wherein the inner surface of the main channel 8 is provided with a first expansion cavity 18, a first plug 20 is slidably sleeved in the first expansion cavity 18, a first support spring 19 is fixedly connected between the end surface of the first plug 20 and the end surface of the first expansion cavity 18, and a ring channel 21 is provided in the side wall of the first expansion cavity 18, the two ends of the ring channel 21 are connected to the shrinkage of the first expansion cavity 18, and an air outlet 22 is connected between the ring channel 21 and the sealed cylinder 12, the movable mold 5 and the fixed mold 3 are connected. A slide 30 and a first inner cavity 23 are provided, a first branch channel 24 is connected between the end face of the first inner cavity 23 and the annular channel 21, and an auxiliary exhaust channel 25 is connected between the end of the first inner cavity 23 and the main exhaust channel 26, a first pressure valve 27 is installed in the auxiliary exhaust channel 25, a first diaphragm 31 is fixedly connected to the side wall of the first inner cavity 23, a slide 32 is fixedly connected to the side wall of the first diaphragm 31, a first blockage 33 and a second blockage 34 are fixedly connected to the end face of the slide 32, and a sealing sleeve 35 is fixedly connected to the outer surface of the first blockage 33.

[0024] See also Figure 4 The slide 32 is T-shaped, and the slide 32 is slidably connected to the slide 30 , the first blocker 33 is slidably connected to the main exhaust duct 26 , and the moving direction of the first blocker 33 is perpendicular to the central axis of the main exhaust duct 26 .

[0025] See also Figure 4 The sealing sleeve 35 seals the gap between the main exhaust passage 26 and the first blocking member 33 , and the second blocking member 34 is slidably connected to the outlet passage 22 , and the moving direction of the second blocking member 34 is perpendicular to the central axis of the outlet passage 22 .

[0026] Specifically, during the process of pressurized air supply in the air inlet 37, the gas pushes the second plug 39, causing the second plug 39 to rise up to overcome the resistance of the second support spring 40, thereby opening the constriction of the second expansion chamber 36, allowing the gas to accelerate through the constriction of the second expansion chamber 36, and pass through the slide groove 11 and the embedded groove 10 into the mold cavity 7. At the same time, a negative pressure is formed at the constriction of the second expansion chamber 36, causing the constriction of the second expansion chamber 36 to absorb air in the second branch channel 42, and further absorb air at the end of the second inner cavity 41, causing the air pressure at both ends of the second inner cavity 41 to be unbalanced, thereby causing the second diaphragm 45 to sag, causing the third blocking 46 on the second diaphragm 45 to close. The mold cavity 7 is evenly covered with the mold release agent, and the mold cavity 7 is evenly covered with the mold release agent. The ...

[0027] Example 3, please refer to Figure 3 and Figure 5-Figure 9 The present invention provides a technical solution: a shaping mold that facilitates rapid demolding of plastic products. A second expansion cavity 36, an air inlet 37, and a second inner cavity 41 are formed in both the movable mold 5 and the fixed mold 3. One end of the second expansion cavity 36 is connected to the slide groove 11, and the other end of the second expansion cavity 36 is connected to the air inlet 37. An air duct connector 38 is fixedly connected to the end of the air inlet 37. A second plug 39 is slidably sleeved in the second expansion cavity 36. A second support spring 40 is fixedly connected between the end surface of the second plug 39 and the end surface of the second expansion cavity 36. A second branch 42 is connected between the end surface of the second inner cavity 41 and the constriction of the second expansion cavity 36. The main channel 8 is connected to one end of the secondary channel 43, and the other end of the secondary channel 43 is connected to the annular cavity 47. The inner surface of the annular cavity 47 is connected to the nozzle 48. A sliding cavity 44 is provided in the movable mold 5 and the fixed mold 3. The sliding cavity 44 is connected to the secondary channel 43. A second diaphragm 45 is fixedly connected to the side wall of the second inner cavity 41, and a third blockage 46 is fixedly connected to the side wall of the second diaphragm 45. An injection channel 49 is provided on the fixed mold 3, and a limiting groove 51 is provided in the fixed mold 3. An inclined block 52 is slidably sleeved in the limiting groove 51. A return spring is fixedly connected between the inclined block 52 and the limiting groove 51, and a baffle 53 is fixedly connected to the side wall of the inclined block 52.

[0028] See also Figure 5 The central axis of the sliding cavity 44 is perpendicular to the central axis of the secondary flow channel 43 , the third blocking member 46 is slidably connected to the sliding cavity 44 , and the air inlet channel 37 is not connected to the main flow channel 8 .

[0029] See also Figure 6 and Figure 7-Figure 9 The annular cavity 47 is sleeved with the top end of the embedding groove 10, a plurality of nozzles 48 are provided, and the plurality of nozzles 48 are evenly distributed about the central axis of the air inlet 37, and the baffle 53 is slidably sleeved with the injection flow channel 49.

[0030] Specifically, during the process of spraying the release agent, the air pressure in the mold cavity 7 increases, causing the air pressure between the exhaust steel 28 and the first pressure valve 27 to increase. When the pressure value reaches the preset value of the first pressure valve 27, the first pressure valve 27 opens, thereby unblocking the secondary exhaust channel 25, causing the air pressure at the end of the first inner cavity 23 to rise again, thereby resetting the first diaphragm 31, the slide 32, the first blockage 33 and the second blockage 34, 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 mold 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 closing block 17 is restricted by the embedded groove 10 and cannot rise, so that the air pressure in the sealed cylinder 12 rises first, pushing the first piston rod 13 to reset, and then pushing the lower closing block 17 to reset. At this time, the pressure in the sealed cylinder 12 reaches the initial Value, if the gas during injection molding enters the sealed cylinder 12 through the above path, the second pressure valve 54 is pressurized to open and discharge the amount of gas just entering to avoid affecting the exhaust during injection molding. The above process is a case of precise mold closing. If the fixed mold 3 and the movable mold 5 are not fully closed, the air pressure in the cavity 7 cannot be increased and the system cannot be reset, so the lower closing block 17 and the upper closing block 50 cannot be reset, making it impossible for the upper closing block 50 to squeeze the inclined surface of the inclined block 52, making it impossible for the inclined block 52 to shrink into the limiting groove 51 and compressing the reset spring, so that the baffle 53 always seals the injection flow channel 49, making it impossible to complete the injection molding, achieving the purpose of mold closing self-inspection, and at the same time, the mold closing detection is closely linked 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 splashing of molten material, improving safety, greatly shortening the injection molding cycle, and improving production efficiency.

[0031] The working principle and use process of the present invention are as follows: when it is necessary to injection mold a plastic product, the top mold 1 and the bottom mold 6 are fixed to the injection molding machine using high-strength bolts, and the mold release agent connector 9 on the movable mold 5 and the fixed mold 3 is connected to the liquid supply system, and the airway connector 38 is connected to the air supply system. At this time, the injection molding machine is started again, so that the movable mold 5 and the fixed mold 3 are molded together, the mold cavity 7 is closed, and the mold release agent is then introduced into the main channel 8 through the liquid supply system, and the first plug 20 in the first expansion cavity 18 is squeezed, so that the first plug 20 overcomes the resistance of the first support spring 19 and moves horizontally, thereby The constricted end of the first expansion cavity 18 is opened, so that the release agent accelerates to flow at the constricted end of the first expansion cavity 18. According to the Venturi effect, the pressure at the constricted end of the first expansion cavity 18 is reduced. To restore the pressure balance, the constricted end of the first expansion cavity 18 draws air from the annular channel 21. At this time, the second blocking 34 closes the air outlet 22, so that the annular channel 21 can only draw air from the first inner cavity 23 through the first branch channel 24, causing the air pressure at both ends of the first inner cavity 23 to be unbalanced, thereby causing the first diaphragm 31 to sag, causing the slide 32 on the first diaphragm 31 to move horizontally. , and then the slide 32 drives the first blocking 33 and the second blocking 34 to move horizontally, so that the bottom end of the main exhaust channel 26 is sealed, and the air outlet 22 is unblocked. As the release agent in the main channel 8 continues to circulate, according to the above principle, the annular channel 21 continues to absorb air, and at this time the air outlet 22 is unblocked, so that the annular channel 21 absorbs the air in the closed tube 12 through the air outlet 22. Because the closed chamber 15 is connected to the closed tube 12 through the air guide 14, the air pressure in the closed chamber 15 decreases, thereby causing the second piston rod 16 and the lower closing block 17 to descend. , so that the lower closing block 17 moves to the bottom end of the embedding groove 10. At this time, the embedding groove 10 releases the restriction on the lower closing block 17 and the first piston rod 13. As the air in the sealing cylinder 12 continues to decrease, the first piston rod 13 contracts and drives the lower closing block 17 to move horizontally, thereby opening the embedding groove 10, so that the nozzle 48 on the annular cavity 47 is connected with the cavity 7. In summary, the nozzle 48 can be hidden in the mold to avoid affecting the integrity of the cavity 7, thereby ensuring the quality of injection molding and preventing the spraying of the release agent from interfering with the injection molding of the plastic part. After the above-mentioned embedded groove 10 is opened, pressurized air is supplied to the air inlet 37 through the air supply system, so that the gas pushes the second leather plug 39, causing the second leather plug 39 to rise up to overcome the resistance of the second support spring 40, thereby opening the constriction of the second expansion chamber 36, allowing the gas to accelerate through the constriction of the second expansion chamber 36 and pass through the slide groove 11 and the embedded groove 10 into the mold cavity 7. At the same time, negative pressure is formed at the constriction of the second expansion chamber 36, causing the constriction of the second expansion chamber 36 to absorb air from the second branch channel 42, and further absorb air from the end of the second inner cavity 41, causing the air pressure at both ends of the second inner cavity 41 to be unbalanced, thereby causing the second diaphragm 45 to sag, causing the third diaphragm on the second diaphragm 45 to be compressed. The obstruction 46 is translated, thereby making the secondary flow channel 43 unblocked, so that the mold release agent can flow from the main flow channel 8 through the secondary flow channel 43 into the annular cavity 47, and supply liquid to the nozzle 48, so that the nozzle 48 sprays the mold release agent, and the gas flowing in from the air inlet 37 is fully dispersed to form a uniform spray, so that the mold cavity 7 can be evenly covered by the mold release agent, achieving the purpose of automatically spraying the mold release agent on the final mold, without the need for manual participation in all plastic parts injection molding, and without the need to use a robotic arm, reducing costs, saving time and labor, and fully improving the injection molding efficiency. At the same time, there is no need to consider control programming and the use of position sensors, which fully simplifies the injection molding process, reduces the risk of device damage, and has low subsequent maintenance costs; With the spraying of the release agent and the entry of gas, the air pressure in the mold cavity 7 increases, and the air pressure between the exhaust steel 28 and the first pressure valve 27 increases. When the pressure value reaches the preset value of the first pressure valve 27, the first pressure valve 27 opens, thereby unblocking the secondary exhaust channel 25, so that the air pressure at the end of the first inner cavity 23 rises, 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 channel 22 is resealed. At this time, the liquid supply system stops supplying liquid, so that the high-pressure gas in the mold 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 closing block 17 is restricted by the embedded groove 10 and cannot rise, so that the air pressure in the sealed cylinder 12 rises first, pushing the first piston rod 13 to reset, and then pushing the lower closing block 17 to reset. At this time, the pressure in the sealed cylinder 12 reaches the initial value. If the gas during injection molding enters the sealed cylinder 12 through the above-mentioned path, the second pressure valve 54 is pressurized to open and discharge the amount of gas just entered to avoid affecting the exhaust during injection molding. The above process is a case of precise mold closing. If the fixed mold 3 and the movable mold 5 are not fully closed, the air pressure in the cavity 7 cannot be increased and the system cannot be reset. Therefore, the lower closing block 17 and the upper closing block 50 cannot be reset, making it impossible for the upper closing block 50 to squeeze the inclined surface of the inclined block 52, making it impossible for the inclined block 52 to shrink into the limiting groove 51 and compressing the reset spring, so that the baffle 53 always seals the injection flow channel 49, making it impossible to complete the injection molding, achieving the purpose of mold closing self-inspection. At the same time, the mold closing detection is closely linked 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 splashing of molten material, improving safety, greatly shortening the injection molding cycle, improving production efficiency, and completing the operation.

[0032] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It is apparent to those skilled in the art that various changes, modifications, substitutions, and variations to these embodiments may be made without departing from the principles and spirit of the present invention, and these changes and modifications still fall within the scope of protection of the present invention.

Claims

1. A shaping mold for facilitating rapid demoulding of plastic products, characterized in that: The invention comprises a top mold (1), a gate sleeve (2) is installed on the end surface of the top mold (1), and the bottom surface of the top mold (1) is fixedly connected to a fixed mold (3), the bottom surface of the fixed mold (3) is fixedly connected to one end of a guide column (4), the other end of the guide column (4) is engaged with a movable mold (5), the bottom surface of the movable mold (5) is fixedly connected to a bottom mold (6), and a cavity (7) is provided between the movable mold (5) and the fixed mold (3), main channels (8) are provided in both the movable mold (5) and the fixed mold (3), both ends of the main channel (8) are connected to release agent joints (9), the bottom surface of the cavity (7) is provided with an embedding groove (10), the bottom surface of the embedding groove (10) is provided with a slide groove (11), a sealed cylinder (12) is fixedly connected to the side wall of the slide groove (11), and a second A pressure valve (54) is provided, and one end of a first piston rod (13) is slidably sleeved in the sealed cylinder (12), a sealed cavity (15) is provided at the other end of the first piston rod (13), an air guide channel (14) is provided on the bottom surface of the sealed cavity (15), the air 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 closing block (17) and an upper closing block (50) are fixedly connected to the end surface of the second piston rod (16), an exhaust steel (28) is fixedly connected to the end surface of the cavity (7), the bottom surface of the exhaust steel (28) is communicated with one end of a main exhaust channel (26), 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).

2. A shaping mold for facilitating rapid demoulding of plastic products according to claim 1, characterized in that: The release agent joints (9) are provided in two groups, one group of release agent joints (9) is fixedly connected to the side wall of the movable mold (5), and the other group of release agent joints (9) is fixedly connected to the side wall of the fixed mold (3). The embedded groove (10) is arranged in an L-shape, and the lower closing block (17) and the upper closing block (50) are both slidably connected to the embedded groove (10). The first piston rod (13) is arranged in an L-shape, and the first piston rod (13) is slidably connected to the slide groove (11). The one-way valve (29) prevents the gas in the sealed cylinder (12) from being discharged, and the second pressure valve (54) prevents the external gas from flowing into the sealed cylinder (12).

3. A shaping mold for facilitating rapid demoulding of plastic products according to claim 1, characterized in that: The inner surface of the main channel (8) is provided with a first expansion cavity (18), a first plug (20) is slidably sleeved in the first expansion cavity (18), a first support spring (19) is fixedly connected between the end surface of the first plug (20) and the end surface of the first expansion cavity (18), and a ring channel (21) is provided in the side wall of the first expansion cavity (18), both ends of the ring channel (21) are connected to the shrinkage of the first expansion cavity (18), and an air outlet (22) is connected between the ring channel (21) and the sealed cylinder (12), a slideway (30) and a first inner cavity (23) are provided in the movable mold (5) and the fixed mold (3), A first branch channel (24) is connected between the end face of the first inner cavity (23) and the annular channel (21), and an auxiliary exhaust channel (25) is connected between the end of the first inner cavity (23) and the main exhaust channel (26). A first pressure valve (27) is installed in the auxiliary exhaust channel (25). A first diaphragm (31) is fixedly connected to the side wall of the first inner cavity (23), a slide (32) is fixedly connected to the side wall of the first diaphragm (31), a first blockage (33) and a second blockage (34) are fixedly connected to the end face of the slide (32), and a sealing sleeve (35) is fixedly connected to the outer surface of the first blockage (33).

4. A shaping mold for facilitating rapid demoulding of plastic products according to claim 3, characterized in that: The slide (32) is arranged in a T-shape, and the slide (32) is slidably sleeved with the slideway (30), the first blocker (33) is slidably sleeved with the main exhaust duct (26), and the moving direction of the first blocker (33) is perpendicular to the central axis of the main exhaust duct (26).

5. The shaping mold for facilitating rapid demoulding of plastic products according to claim 3, characterized in that: The sealing sleeve (35) seals the gap between the main exhaust duct (26) and the first blockage (33), the second blockage (34) is slidably connected to the outlet duct (22), and the moving direction of the second blockage (34) is perpendicular to the central axis of the outlet duct (22).

6. A shaping mold for facilitating rapid demoulding of plastic products according to claim 3, characterized in that: The movable mold (5) and the fixed mold (3) are both provided with a second expansion cavity (36), an air inlet (37) and a second inner cavity (41). One end of the second expansion cavity (36) is communicated with the slide groove (11), and the other end of the second expansion cavity (36) is communicated with the air inlet (37), and the end of the air inlet (37) is fixedly connected with an air duct connector (38). A second plug (39) is slidably sleeved in the second expansion cavity (36), and a second support spring (40) is fixedly connected between the end face of the second plug (39) and the end face of the second expansion cavity (36). A second branch channel (42) is communicated between the end face of the second inner cavity (41) and the constriction of the second expansion cavity (36). One end of the secondary flow channel (43) is connected to the main flow channel (8). The other end of the secondary flow channel (43) is connected to an annular cavity (47), and the inner surface of the annular cavity (47) is connected to a nozzle (48). The movable mold (5) and the fixed mold (3) are both provided with a sliding cavity (44), and the sliding cavity (44) is connected to the secondary flow channel (43). A second diaphragm (45) is fixedly connected to the side wall of the second inner cavity (41), and a third block (46) is fixedly connected to the side wall of the second diaphragm (45). An injection flow channel (49) is provided on the fixed mold (3), and a limiting groove (51) is provided in the fixed mold (3). An inclined block (52) is slidably sleeved in the limiting groove (51), a return spring is fixedly connected between the inclined block (52) and the limiting groove (51), and a baffle (53) is fixedly connected to the side wall of the inclined block (52).

7. A shaping mold for facilitating rapid demoulding of plastic products according to claim 6, characterized in that: The central axis of the sliding cavity (44) is perpendicular to the central axis of the secondary flow channel (43), the third blocker (46) is slidably connected to the sliding cavity (44), and the air inlet channel (37) is not connected to the main flow channel (8).

8. The shaping mold for facilitating rapid demoulding of plastic products according to claim 6, characterized in that: The annular cavity (47) is sleeved with the top end of the embedding groove (10), a plurality of nozzles (48) are provided, and the plurality of nozzles (48) are evenly distributed about the central axis of the air inlet channel (37), and the baffle (53) is slidably sleeved with the injection flow channel (49).

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