Mould easy to demould

Abstract

The invention relates to the field of molds, and particularly discloses an easy-to-demold mold which comprises a mold base mechanism, a mold mechanism, a limiting mechanism and an inflating and deflating mechanism. The mold mechanism is provided with a lower mold, a forming part, a middle mold and an upper mold, and finished products can be conveniently separated through sliding connection of the middle mold and the lower mold and arrangement of the forming part. The limiting mechanism comprises an ejector pin to prevent a finished product from adhering to the middle mold. And the gas mechanism is used for injecting gas between the finished product and the lower mold to realize rapid demolding. According to the demolding device, the efficient and convenient demolding process is achieved, and the production efficiency and the product quality are improved.

Description

Technical Field

[0001] The present application relates to the field of molds, and in particular to a mold that is easy to demould. Background Art

[0002] At present, injection molds are molds used to manufacture plastic products. They are mainly formed by injecting molten plastic into the mold through an injection molding machine. Injection molds usually consist of a movable mold and a fixed mold. The movable mold can move, while the fixed mold is fixed. During the injection molding process, the movable mold and the fixed mold will be combined to form a closed cavity. The plastic melt is injected into the cavity through the nozzle of the injection molding machine, and the desired plastic product is formed after cooling and solidification.

[0003] In the related art, after the product in the injection mold is solidified and formed, the mold will open, and the product will remain on one side of the movable mold or the fixed mold. The product will be ejected from the mold through the ejection mechanism to complete the demoulding process.

[0004] The above-mentioned related technologies have the following defects: when molding products through injection molds, according to production requirements, some injection molds will form deep grooves in the cavity during the manufacturing process. After the plastic melt solidifies in the deep grooves, due to the depth of the deep grooves themselves, the bonding strength between the solidified plastic product and the mold at the deep grooves is high. During the demolding process of the deep groove part of the injection mold, demolding is difficult, which can easily cause excessive pulling on the product and thus damage the product. Summary of the invention

[0005] In order to facilitate demoulding of the injection mold, the present application provides a mold that is easy to demould.

[0006] The present application provides a mold that is easy to demould using the following technical solution: A mold that is easy to demould comprises a mold base mechanism, a mold mechanism, a limit mechanism and an air filling and deflation mechanism, wherein the mold base mechanism comprises a guide rod; The mold mechanism comprises a lower mold, a molding part, a middle mold and an upper mold. In the length direction of the guide rod, the lower mold and the upper mold are both slidably connected to the guide rod, and the lower mold is provided with a lower cavity at one end facing the upper mold, and the upper mold is provided with an upper cavity at one end facing the lower mold. The middle mold is arranged in the lower mold cavity, and in a first direction, the middle mold is slidably connected to the lower mold, and the first direction intersects with the length direction of the guide rod; The molded part is arranged in the upper cavity and connected to the upper mold; In the first direction, the molding piece is arranged between the middle mold and the upper mold, and a molding groove is arranged at one end of the molding piece facing the middle mold, and the molding groove is arranged along the length direction of the guide rod; The limiting mechanism comprises an ejector pin arranged along the first direction, and in the first direction, one end of the ejector pin is slidably connected to the middle mold, and the other end is used to extend into the molding groove; The gas filling and deflation mechanism is used to inject gas into the lower mold cavity or to extract the gas in the lower mold cavity.

[0007] By adopting the above technical scheme, the molds are closed between the lower mold, the middle mold and the upper mold, and after the ejector is inserted into the molding groove, the plastic melt is injected into the lower cavity or the upper cavity. After the plastic melt is cooled and solidified to form the desired plastic product, the upper mold is separated from the lower mold in the length direction of the guide rod, and the upper mold is separated from the product. Since the ejector holds the product in the molding groove, the product in the molding groove is limited by the ejector. When the molded part is separated from the product along with the upper mold, the product in the molding groove is not easily pulled and deformed by the upper mold, and the product in the molding groove is easy to demold. Then the inflation and deflation mechanism performs an air suction action so that the product is adsorbed on the lower mold, and then the middle mold is separated from the product to achieve separation from the product. Finally, the inflation and deflation mechanism performs an action of injecting gas into the lower cavity. Under the action of air pressure, the product is separated from the lower mold to achieve rapid demolding. Furthermore, the present application can make the injection mold easy to demold.

[0008] Optionally, the die base mechanism further comprises a first base, a lower die base and an upper die base, wherein the first base is connected to one end of the guide rod; The lower die seat and the upper die seat are both slidably connected to the guide rod, and the lower die seat is arranged between the first base and the upper die seat; The lower mold and the upper mold are both arranged between the lower mold base and the upper mold base, and the lower mold is connected to the lower mold base, and the upper mold is connected to the upper mold base.

[0009] By adopting the above technical solution, the lower die seat and the upper die seat are used to install the lower die and the upper die respectively. The first base is used to support the guide rod, and the lower die seat and the upper die seat can slide on the guide rod to facilitate the opening and closing and demoulding operations of the mold.

[0010] Optionally, the mold mechanism further includes a driving assembly, the driving assembly includes a first side bracket and a first telescopic member, the first side bracket is arranged on the side of the middle mold and connected to the upper mold base; The first telescopic member is arranged along the first direction, and one end of the first telescopic member is connected to the first side bracket, and the other end of the first telescopic member is connected to the middle mold.

[0011] By adopting the above technical solution, the sliding of the middle mold can be automatically controlled through the telescopic movement of the first telescopic member, thereby realizing an automated demoulding process.

[0012] Optionally, the middle mold is provided with a connecting through hole arranged along the first direction, and the ejector pin is coaxially arranged in the connecting through hole; The limiting mechanism further includes a second side bracket and a second telescopic member, wherein the second side bracket is arranged on the side of the middle mold and connected to an end of the ejector away from the molded part; The second telescopic member is arranged along the first direction, and one end of the second telescopic member is connected to the first side bracket, and the other end of the second telescopic member is connected to the second side bracket.

[0013] By adopting the above technical solution, the position and movement of the ejector pin can be accurately controlled through the telescopic movement of the second telescopic member.

[0014] Optionally, the middle mold is provided with a connecting through hole arranged along the first direction, and a cavity is provided inside the middle mold, and the cavity is connected to the connecting through hole; The limiting mechanism further comprises a connecting shaft, a limiting block and a limiting spring, one end of the ejector pin is coaxially arranged in the connecting through hole, and the other end is used to extend into the forming groove; The limiting block is mounted on an end of the ejector away from the molded part; The connecting shaft is installed at one end of the limiting block away from the ejector pin and is coaxially arranged in the connecting through hole; The limit spring is arranged in the cavity and sleeved on the connecting shaft, and one end of the limit spring is connected to the limit block and the other end is connected to the middle mold.

[0015] By adopting the above technical solution, the limit spring presses the limit block toward the molding groove, so that when the upper mold and the lower mold are closed, the ejector pin can enter the molding groove. When the product is demoulded, the ejector pin can limit the position of the product in the molding groove, so that the product in the molding groove is not easily pulled upward, which is conducive to the separation of the upper mold and the product. At the same time, under the action of the limit spring, in the first direction, the ejector pin can elastically contact with the product, while limiting the position of the product, it will not crush the product in the molding groove, which is conducive to the separation of the upper mold and the product.

[0016] Optionally, the ejector pin is dynamically sealed to the middle mold.

[0017] By adopting the above technical solution, the plastic melt is prevented from entering the connecting through hole.

[0018] Optionally, the mold base mechanism further includes a second base, which is disposed on a side of the first base away from the lower mold base and is connected to the first base by a connecting bracket; The inflation and deflation mechanism comprises a limit tube, an outer tube, a linear bearing, an inner tube and a sealing plug, the lower mold is provided with a first plug hole, the lower mold base is provided with a second plug hole, the first plug hole and the second plug hole are both arranged along the length direction of the guide rod, and the first plug hole and the second plug hole are coaxial; The limiting tube is coaxially arranged in the first plug hole; The outer tube is arranged between the limiting tube and the second base, and is slidably connected to the first base. The outer tube is coaxially connected to the limiting tube, and the inner diameter of the limiting tube is smaller than the inner diameter of the outer tube. The linear bearing is coaxially mounted on the end of the outer tube away from the limiting tube; The inner tube is coaxially installed in the linear bearing, one end of which is connected to the second base, and the other end is arranged in the outer tube, and the outer diameter of the inner tube is smaller than the inner diameter of the inner tube; The side wall of the air outlet end of the inner tube is provided with an air outlet hole, and the air outlet hole is arranged between the linear bearing and the limiting tube; The sealing plug is arranged between the outer tube and the position limiting tube, and one end of the sealing plug is connected to the air outlet end of the outer tube, and the other end is used to be plugged into the inner hole of the position limiting tube.

[0019] By adopting the above technical solution, the inner tube and the outer tube can be slidably connected through the linear bearing, and then the relative position between the limit tube and the sealing plug can be adjusted by sliding the lower mold seat on the guide rod to achieve the closing and opening of the inner hole of the limit tube. The outer diameter of the inner tube is smaller than the inner diameter of the inner tube. After the sealing plug is separated from the limit tube, the inner hole of the limit tube, the gap between the inner tubes and the air outlet can effectively connect the lower cavity and the inner tube, which is conducive to injecting gas into the lower cavity through the inner tube or extracting the air between the lower cavity and the product through the inner tube, so as to achieve vacuum adsorption of the product.

[0020] Optionally, the inflation and deflation mechanism further includes a limit plate, a support tube and a shock absorbing spring, wherein the limit plate is mounted on an end of the lower die base away from the lower die and connected to the outer tube; The support tube is disposed between the lower die seat and the first base, is coaxially sleeved on the outer tube, and is also connected to the lower die seat; The shock-absorbing spring is arranged between the lower die seat and the first base, one end of which is connected to the lower die seat, and the other end of which is connected to the first base, and is sleeved on the outer tube inside the support tube, and the length of the shock-absorbing spring is greater than the length of the support tube.

[0021] By adopting the above technical solution, the shock-absorbing spring is used to alleviate the vibration generated by the upper mold and the lower mold when the mold is closed, and to connect the lower mold base and the first base, and limit the relative position between the lower mold base and the first base within a certain range. When the mold is closed, the lower mold base moves downward, the shock-absorbing spring is compressed, and the support tube contacts the first base, which is used to stably support the upper mold base and prevent the shock-absorbing spring from being damaged by excessive compression. Moreover, when the support tube contacts the first base, the sealing plug just plugs the inner hole of the limiting tube. When the mold is opened, the upper mold base moves away from the lower mold base, and the shock-absorbing spring is reset. The upper mold base is driven away from the first base by the shock-absorbing spring, the outer tube moves away from the inner tube, and the sealing plug just moves away from the inner hole of the limiting tube. Then the shock-absorbing spring cooperates with the support tube to realize the automatic opening and closing of the inflation and deflation mechanism.

[0022] Optionally, the inflation and deflation mechanism further comprises a bellows, which is sleeved on the inner tube, and has one end sealedly connected to the inner tube, and the other end sealedly connected to an end of the outer tube away from the lower mold; The inner tube is also dynamically sealedly connected to the linear bearing.

[0023] By adopting the above technical solution, the bellows has good elasticity and sealing performance, and can effectively prevent gas leakage. The inner tube is also dynamically sealed with the linear bearing, and cooperates with the bellows to achieve double sealing to ensure that gas will not leak from the connection.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. In this application, by setting up the coordination between the mold base mechanism, the mold mechanism, the limit mechanism and the inflation and deflation mechanism, rapid demoulding is achieved, and the demoulding efficiency and product quality are improved.

[0025] 2. In the present application, after the plastic melt is cooled and solidified to form the desired plastic product, the upper mold is moved away from the lower mold in the length direction of the guide rod, so that the upper mold is separated from the product. Since the ejector pin supports the product in the molding groove, the product in the molding groove is limited by the ejector pin. When the molded product is separated from the product along with the upper mold, the product in the molding groove is not easily pulled and deformed by the upper mold, and the product in the molding groove is easy to demold.

[0026] 3. In the present application, the inflation and deflation mechanism is used to inject gas into the lower cavity or to extract the gas in the lower cavity to achieve fixation and separation between the product and the lower mold.

[0027] 4. In the present application, the limit spring presses the limit block toward the molding groove, so that when the upper mold and the lower mold are closed, the ejector pin can enter the molding groove. When the product is demolded, the ejector pin can limit the position of the product in the molding groove, so that the product in the molding groove is not easily pulled upward, which is beneficial to the separation of the upper mold and the product. At the same time, under the action of the limit spring, in the first direction, the ejector pin can elastically contact the product. While limiting the position of the product, the product will not be crushed in the molding groove, which is beneficial to the separation of the upper mold and the product.

[0028] 5. In the present application, the inner tube and the outer tube can be slidably connected through linear bearings, and then the relative position between the limiting tube and the sealing plug can be adjusted by sliding the lower mold base on the guide rod to achieve the closing and opening of the inner hole of the limiting tube.

[0029] 6. In the present application, the outer diameter of the inner tube is smaller than the inner diameter of the inner tube. After the sealing plug is separated from the limiting tube, the inner hole of the limiting tube, the gap between the inner tubes and the air vents enable the lower cavity and the inner tube to be effectively connected, which is beneficial for injecting gas into the lower cavity through the inner tube or extracting the air between the lower cavity and the product through the inner tube, thereby realizing vacuum adsorption of the product.

[0030] 7. In the present application, the shock-absorbing spring is used to alleviate the vibration generated when the upper mold and the lower mold are closed, and to connect the lower mold base and the first base to limit the relative position between the lower mold base and the first base within a certain range.

[0031] 8. In this application, when the mold is closed, the lower mold seat moves down, the shock-absorbing spring is compressed, and the support tube contacts the first base, which is used to stably support the upper mold seat and prevent the shock-absorbing spring from being damaged by excessive compression. When the support tube contacts the first base, the sealing plug just plugs the inner hole of the limit tube. When the mold is opened, the upper mold seat moves away from the lower mold seat, the shock-absorbing spring is reset, and the upper mold seat is driven away from the first base by the shock-absorbing spring, the outer tube moves away from the inner tube, and the sealing plug just moves away from the inner hole of the limit tube. Then the shock-absorbing spring cooperates with the support tube to realize the automatic opening and closing of the inflation and deflation mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application; Figure 2 It is a schematic diagram of the cross-sectional structure of an embodiment of the present application.

[0034] Reference numerals: 1. Die base mechanism; 11. Guide rod; 12. First base; 13. Lower die base; 1301. Second plug hole; 14. Upper die base; 15. Second base; 16. Connecting bracket; 2. Die mechanism; 21. Lower die; 2101. Lower cavity; 2102. First plug hole; 22. Middle die; 2201. Connecting through hole; 2202. Cavity; 23. Driving assembly; 231. First side bracket; 232. First telescopic member; 24. Upper die; 2401. Upper Cavity; 25, molding; 2501, molding groove; 3, limiting mechanism; 31, ejector; 32, limiting block; 33, connecting shaft; 34, limiting spring; 35, second side bracket; 36, second telescopic member; 4, charging and discharging mechanism; 41, limiting tube; 42, outer tube; 43, linear bearing; 44, inner tube; 4401, air outlet; 45, sealing plug; 46, limiting plate; 47, supporting tube; 48, shock-absorbing spring; 49, bellows; 410, ventilation tube. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-2 This application is described in further detail.

[0036] The present application embodiment discloses a mold that is easy to demould. Figure 1 and Figure 2 A mold that is easy to demould comprises a mold base mechanism 1, a mold mechanism 2, a limit mechanism 3 and an inflation and deflation mechanism 4. The mold base mechanism 1 comprises a guide rod 11, a first base 12, a lower mold base 13, an upper mold base 14, a second base 15 and a connecting bracket 16. The first base 12 is connected to one end of the guide rod 11. The lower mold base 13 and the upper mold base 14 are both slidably connected to the guide rod 11, and the lower mold base 13 is arranged between the first base 12 and the upper mold base 14. The second base 15 is arranged on a side of the first base 12 away from the lower mold base 13, and a connecting bracket 16 is connected to the first base 12.

[0037] Reference Figure 1 and Figure 2The mold mechanism 2 includes a lower mold 21, a molding part 25, a middle mold 22 and an upper mold 24. In the length direction of the guide rod 11, the lower mold 21 and the upper mold 24 are both slidably connected to the guide rod 11. In the present application, the lower mold 21 and the upper mold 24 are both arranged between the lower mold base 13 and the upper mold base 14, and the lower mold 21 is connected to the lower mold base 13, and the upper mold 24 is connected to the upper mold base 14. The lower mold base 13 and the upper mold base 14 can slide on the guide rod 11, which is convenient for the opening and closing and demoulding operations of the mold. A lower mold cavity 2101 is provided at one end of the lower mold 21 facing the upper mold 24, and an upper mold cavity 2401 is provided at one end of the upper mold 24 facing the lower mold 21. The middle mold 22 is arranged in the lower mold cavity 2101. In the first direction, the middle mold 22 is slidably connected to the lower mold 21, and the first direction intersects with the length direction of the guide rod 11. The molding part 25 is arranged in the upper mold cavity 2401 and is connected to the upper mold 24. In the first direction, the molding part 25 is arranged between the middle mold 22 and the upper mold 24, and a molding groove 2501 is provided at one end of the molding part 25 facing the middle mold 22, and the molding groove 2501 is arranged along the length direction of the guide rod 11. The limiting mechanism 3 includes an ejector pin 31 arranged along the first direction, and in the first direction, one end of the ejector pin 31 is slidably connected to the middle mold 22, and the other end is used to extend into the molding groove 2501. The inflation and deflation mechanism 4 is used to inject gas into the lower cavity 2101 or to extract the gas in the lower cavity 2101.

[0038] Reference Figure 1 and Figure 2 In the embodiment of the present application, the first direction is a direction perpendicular to the axis of the guide rod 11. After the lower mold 21, the middle mold 22 and the upper mold 24 are molded together and the ejector pin 31 is inserted into the molding groove 2501, the plastic melt is injected into the lower cavity 2101 or the upper cavity 2401. After the plastic melt is cooled and solidified to form the desired plastic product, the upper mold 24 is away from the lower mold 21 in the length direction of the guide rod 11, so that the upper mold 24 is separated from the product. Since the ejector pin 31 supports the product at the molding groove 2501, the product at the molding groove 2501 is limited by the ejector pin 31. When the molded part 25 is separated from the product along with the upper mold 24, the product at the molding groove 2501 is not easily pulled and deformed by the upper mold 24, and the product at the molding groove 2501 is easy to demold. Then the inflation and deflation mechanism 4 performs an air suction action to adsorb the product on the lower mold 21, and then the middle mold 22 is away from the product to achieve separation from the product. Finally, the gas filling and deflation mechanism 4 injects gas into the lower cavity 2101, and under the action of gas pressure, the product is separated from the lower mold 21 to achieve rapid demoulding. Thus, the present application can make the injection mold easy to demould.

[0039] Reference Figure 1 and Figure 2The mold mechanism 2 further includes a driving assembly 23, which includes a first side bracket 231 and a first telescopic member 232. The first side bracket 231 is arranged on the side of the middle mold 22 and is connected to the upper mold base 14. The first telescopic member 232 is arranged along the first direction, and one end is connected to the first side bracket 231, and the other end is connected to the middle mold 22. Through the telescopic movement of the first telescopic member 232, the sliding of the middle mold 22 can be automatically controlled, thereby realizing an automated demoulding process.

[0040] Reference Figure 1 and Figure 2 The middle mold 22 is provided with a connecting through hole 2201 arranged along the first direction, and the ejector pin 31 is coaxially arranged in the connecting through hole 2201. The limiting mechanism 3 also includes a second side bracket 35 and a second telescopic member 36. The second side bracket 35 is arranged on the side of the middle mold 22 and is connected to one end of the ejector pin 31 away from the molding member 25. The second telescopic member 36 is arranged along the first direction, and one end is connected to the first side bracket 231, and the other end is connected to the second side bracket 35. Through the telescopic movement of the second telescopic member 36, the position and movement of the ejector pin 31 can be accurately controlled.

[0041] Reference Figure 1 and Figure 2 , a connecting through hole 2201 arranged along the first direction is provided on the middle mold 22, a cavity 2202 is provided inside the middle mold 22, and the cavity 2202 is communicated with the connecting through hole 2201. The limiting mechanism 3 also includes a connecting shaft 33, a limiting block 32 and a limiting spring 34, one end of the ejector 31 is coaxially arranged in the connecting through hole 2201, and the other end is used to extend into the molding groove 2501. The limiting block 32 is installed at the end of the ejector 31 away from the molding part 25. The connecting shaft 33 is installed at the end of the limiting block 32 away from the ejector 31, and is coaxially arranged in the connecting through hole 2201. The limiting spring 34 is arranged in the cavity 2202, and is sleeved on the connecting shaft 33, and one end is connected to the limiting block 32, and the other end is connected to the middle mold 22.

[0042] Reference Figure 1 and Figure 2 In the embodiment of the present application, the limit spring 34 presses the limit block 32 toward the molding groove 2501, so that when the upper mold 24 and the lower mold 21 are molded together, the ejector pin 31 can enter the molding groove 2501. When the product is demolded, the ejector pin 31 can limit the position of the product at the molding groove 2501, so that the product at the molding groove 2501 is not easily pulled upward, which is conducive to the separation of the upper mold 24 from the product. At the same time, under the action of the limit spring 34, in the first direction, the ejector pin 31 can elastically contact with the product, and while limiting the position of the product, the product will not be crushed in the molding groove 2501, which is conducive to the separation of the upper mold 24 from the product.

[0043] Reference Figure 1and Figure 2 The ejector pin 31 is dynamically sealed to the middle mold 22 to prevent the plastic melt from entering the connecting through hole 2201 .

[0044] Reference Figure 1 and Figure 2 The mold base mechanism 1 also includes a second base 15, which is arranged on the side of the first base 12 away from the lower mold base 13, and is connected to the first base 12 by a connecting bracket 16. The inflation and deflation mechanism 4 includes a limiting tube 41, an outer tube 42, a linear bearing 43, an inner tube 44 and a sealing plug 45. The lower mold 21 is provided with a first plug hole 2102, and the lower mold base 13 is provided with a second plug hole 1301. The first plug hole 2102 and the second plug hole 1301 are both arranged along the length direction of the guide rod 11, and the first plug hole 2102 and the second plug hole 1301 are coaxial. The limiting tube 41 is coaxially arranged in the first plug hole 2102. The outer tube 42 is arranged between the limiting tube 41 and the second base 15, and is slidably connected to the first base 12, and the outer tube 42 is coaxially connected to the limiting tube 41, and the inner diameter of the limiting tube 41 is smaller than the inner diameter of the outer tube 42. The linear bearing 43 is coaxially mounted on one end of the outer tube 42 away from the limiting tube 41. The inner tube 44 is coaxially mounted in the linear bearing 43, and one end is connected to the second base 15, and the other end is arranged in the outer tube 42, and the outer diameter of the inner tube 44 is smaller than the inner diameter of the inner tube 44. The side wall of the air outlet end of the inner tube 44 is provided with an air outlet hole 4401, and the air outlet hole 4401 is arranged between the linear bearing 43 and the limiting tube 41. The sealing plug 45 is arranged between the outer tube 42 and the limiting tube 41, and one end is connected to the air outlet end of the outer tube 42, and the other end is used to be plugged into the inner hole of the limiting tube 41.

[0045] Reference Figure 1 and Figure 2In the embodiment of the present application, the end of the inner tube 44 away from the sealing plug 45 is connected to the ventilation tube 410, and the end of the ventilation tube 410 away from the inner tube 44 is connected to the air pump and the vacuum pump, and the air pump is connected to the ventilation tube 410 through the first valve, and the vacuum pump is connected to the ventilation tube 410 through the second valve. When the inner tube 44 needs to inhale air, the vacuum pump and the second valve are started, so that the inner tube 44 draws out the air between the lower cavity 2101 and the product to achieve vacuum adsorption of the product. When the inner tube 44 needs to inject gas between the lower cavity 2101 and the product, the air pump and the first valve are started, and the inner tube 44 injects gas between the lower cavity 2101 and the product to achieve demoulding of the product. Through the linear bearing 43, the inner tube 44 and the outer tube 42 can be slidably connected, and then the relative position between the limit tube 41 and the sealing plug 45 can be adjusted by sliding the lower mold base 13 on the guide rod 11, so as to achieve the closing and opening of the inner hole of the limit tube 41. The outer diameter of the inner tube 44 is smaller than the inner diameter of the inner tube 44. After the sealing plug 45 is separated from the limiting tube 41, the lower cavity 2101 and the inner tube 44 can be effectively connected through the inner hole of the limiting tube 41, the gap between the inner tubes 44 and 44, and the air outlet 4401, which is beneficial to inject gas into the lower cavity 2101 through the inner tube 44 or to extract the air between the lower cavity 2101 and the product through the inner tube 44, thereby realizing vacuum adsorption of the product and demolding of the product.

[0046] Reference Figure 1 and Figure 2 The inflation and deflation mechanism 4 further includes a limit plate 46, a support tube 47 and a shock absorbing spring 48. The limit plate 46 is installed at one end of the lower die base 13 away from the lower die 21 and is connected to the outer tube 42. The support tube 47 is arranged between the lower die base 13 and the first base 12, and is coaxially sleeved on the outer tube 42, and is also connected to the lower die base 13. The shock absorbing spring 48 is arranged between the lower die base 13 and the first base 12, one end of which is connected to the lower die base 13, and the other end of which is connected to the first base 12, and is sleeved on the outer tube 42 inside the support tube 47, and the length of the shock absorbing spring 48 is greater than the length of the support tube 47.

[0047] Reference Figure 1 and Figure 2In the embodiment of the present application, the shock absorbing spring 48 is used to alleviate the vibration generated by the upper mold 24 and the lower mold when the mold is closed, and to connect the lower mold base 13 and the first base 12, and to limit the relative position between the lower mold base 13 and the first base 12 within a certain range. When the mold is closed, the lower mold base 13 moves downward, the shock absorbing spring 48 is compressed, and the support tube 47 contacts the first base 12, which is used to stably support the upper mold base 14 and prevent the shock absorbing spring 48 from being damaged by excessive compression. Moreover, when the support tube 47 contacts the first base 12, the sealing plug 45 just plugs the inner hole of the limit tube 41. When the mold is opened, the upper mold base 14 is away from the lower mold base 13, and the shock absorbing spring 48 is reset. The upper mold base 14 is driven away from the first base 12 by the shock absorbing spring 48, the outer tube 42 is away from the inner tube 44, and the sealing plug 45 is just away from the inner hole of the limit tube 41. Then, the shock absorbing spring 48 cooperates with the support tube 47 to realize the automatic opening and closing of the inflation and deflation mechanism 4.

[0048] Reference Figure 1 and Figure 2 The inflation and deflation mechanism 4 also includes a bellows 49, which is sleeved on the inner tube 44, and one end of the bellows 49 is sealedly connected to the inner tube 44, and the other end is sealedly connected to the end of the outer tube 42 away from the lower mold 21. The inner tube 44 is also dynamically sealed to the linear bearing 43. In the embodiment of the present application, the bellows 49 has good elasticity and sealing performance, which can effectively prevent gas leakage. The inner tube 44 is also dynamically sealed to the linear bearing 43, and cooperates with the bellows 49 to achieve double sealing to ensure that gas does not leak from the connection.

[0049] The implementation principle of a mold that is easy to demould in the embodiment of the present application is as follows: after the lower mold 21, the middle mold 22 and the upper mold 24 are molded together, and the ejector pin 31 is inserted into the molding groove 2501, the plastic melt is injected into the lower cavity 2101 or the upper cavity 2401. After the plastic melt is cooled and solidified to form the desired plastic product, the upper mold 24 is separated from the lower mold 21 in the length direction of the guide rod 11, and the upper mold 24 is separated from the product. Since the ejector pin 31 supports the product at the molding groove 2501, the product at the molding groove 2501 is limited by the ejector pin 31. When the molded part 25 is separated from the product along with the upper mold 24, the product at the molding groove 2501 is not easily pulled and deformed by the upper mold 24, and the product at the molding groove 2501 is easy to demould. Then the inflation and deflation mechanism 4 performs an air suction action to adsorb the product on the lower mold 21, and then the middle mold 22 is separated from the product to achieve separation from the product. Finally, the gas filling and deflation mechanism 4 injects gas into the lower cavity 2101. Under the action of gas pressure, the product is separated from the lower mold 21 to achieve rapid demoulding.

[0050] Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The words "first", "second", "third" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "One" or "one" and similar words do not indicate a quantitative limit, but indicate that there is at least one. "Include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0051] The above are all optional embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A mold that is easy to demould, characterized in that: It comprises a die base mechanism (1), a die mechanism (2), a limit mechanism (3) and an inflation and deflation mechanism (4), wherein the die base mechanism (1) comprises a guide rod (11); The mold mechanism (2) comprises a lower mold (21), a molded part (25), a middle mold (22) and an upper mold (24); in the length direction of the guide rod (11), the lower mold (21) and the upper mold (24) are both slidably connected to the guide rod (11); and a lower mold cavity (2101) is provided at one end of the lower mold (21) facing the upper mold (24), and an upper mold cavity (2401) is provided at one end of the upper mold (24) facing the lower mold (21); The middle mold (22) is arranged in the lower mold cavity (2101), and in a first direction, the middle mold (22) is slidably connected to the lower mold (21), and the first direction intersects with the length direction of the guide rod (11); The molded part (25) is arranged in the upper mold cavity (2401) and is connected to the upper mold (24); In the first direction, the molding piece (25) is arranged between the middle mold (22) and the upper mold (24), and one end of the molding piece (25) facing the middle mold (22) is provided with a molding groove (2501), and the molding groove (2501) is arranged along the length direction of the guide rod (11); The limiting mechanism (3) comprises an ejector pin (31) arranged along the first direction, and in the first direction, one end of the ejector pin (31) is slidably connected to the middle mold (22), and the other end is used to extend into the molding groove (2501); The gas filling and deflation mechanism (4) is used to inject gas into the lower cavity (2101) or to extract gas from the lower cavity (2101).

2. The mold that is easy to demould according to claim 1, characterized in that: The die base mechanism (1) further comprises a first base (12), a lower die base (13) and an upper die base (14); the first base (12) is connected to one end of the guide rod (11); The lower die seat (13) and the upper die seat (14) are both slidably connected to the guide rod (11), and the lower die seat (13) is arranged between the first base (12) and the upper die seat (14); The lower mold (21) and the upper mold (24) are both arranged between the lower mold base (13) and the upper mold base (14), and the lower mold (21) is connected to the lower mold base (13), and the upper mold (24) is connected to the upper mold base (14).

3. The mold that is easy to demould according to claim 2, characterized in that: The mold mechanism (2) further comprises a driving assembly (23), wherein the driving assembly (23) comprises a first side bracket (231) and a first telescopic member (232), wherein the first side bracket (231) is arranged on the side of the middle mold (22) and is connected to the upper mold base (14); The first telescopic member (232) is arranged along a first direction, and one end is connected to the first side bracket (231), and the other end is connected to the middle mould (22).

4. The mold that is easy to demould according to claim 3, characterized in that: The middle mold (22) is provided with a connecting through hole (2201) arranged along the first direction, and the ejector pin (31) is coaxially arranged in the connecting through hole (2201); The limiting mechanism (3) further comprises a second side bracket (35) and a second telescopic member (36); the second side bracket (35) is arranged on the side of the middle mold (22) and is connected to an end of the ejector pin (31) away from the molded member (25); The second telescopic member (36) is arranged along the first direction, and one end is connected to the first side bracket (231), and the other end is connected to the second side bracket (35).

5. The mold that is easy to demould according to claim 3, characterized in that: The middle mold (22) is provided with a connecting through hole (2201) arranged along the first direction, and a cavity (2202) is provided inside the middle mold (22), and the cavity (2202) is communicated with the connecting through hole (2201); The limiting mechanism (3) further comprises a connecting shaft (33), a limiting block (32) and a limiting spring (34); one end of the ejector pin (31) is coaxially arranged in the connecting through hole (2201), and the other end is used to extend into the molding groove (2501); The limiting block (32) is installed at an end of the ejector pin (31) away from the molded part (25); The connecting shaft (33) is mounted on an end of the limiting block (32) away from the ejector pin (31), and is coaxially arranged in the connecting through hole (2201); The limit spring (34) is disposed in the cavity (2202) and sleeved on the connecting shaft (33), and one end of the limit spring is connected to the limit block (32) and the other end is connected to the middle mold (22).

6. A mold that is easy to demould according to any one of claims 4-5, characterized in that: The ejector pin (31) is dynamically sealed to the middle mold (22).

7. The mold that is easy to demould according to claim 2, characterized in that: The die base mechanism (1) further comprises a second base (15), the second base (15) being arranged on a side of the first base (12) away from the lower die base (13), and a connecting bracket (16) being connected to the first base (12); The inflation and deflation mechanism (4) comprises a limit tube (41), an outer tube (42), a linear bearing (43), an inner tube (44) and a sealing plug (45); the lower mold (21) is provided with a first plug hole (2102); the lower mold base (13) is provided with a second plug hole (1301); the first plug hole (2102) and the second plug hole (1301) are both arranged along the length direction of the guide rod (11); and the first plug hole (2102) and the second plug hole (1301) are coaxial; The limiting tube (41) is coaxially arranged in the first insertion hole (2102); The outer tube (42) is arranged between the position limiting tube (41) and the second base (15), and is slidably connected to the first base (12). The outer tube (42) is coaxially connected to the position limiting tube (41), and the inner diameter of the position limiting tube (41) is smaller than the inner diameter of the outer tube (42); The linear bearing (43) is coaxially mounted on an end of the outer tube (42) away from the limiting tube (41); The inner tube (44) is coaxially mounted in the linear bearing (43), one end of which is connected to the second base (15), and the other end of which is disposed in the outer tube (42), and the outer diameter of the inner tube (44) is smaller than the inner diameter of the inner tube (44); An air outlet hole (4401) is provided on the side wall of the air outlet end of the inner tube (44), and the air outlet hole (4401) is provided between the linear bearing (43) and the limiting tube (41); The sealing plug (45) is arranged between the outer tube (42) and the limiting tube (41), with one end connected to the air outlet end of the outer tube (42) and the other end being used to be inserted into the inner hole of the limiting tube (41).

8. The mold that is easy to demould according to claim 7, characterized in that: The inflation and deflation mechanism (4) further comprises a limit plate (46), a support tube (47) and a shock absorbing spring (48); the limit plate (46) is mounted on an end of the lower die base (13) away from the lower die (21) and is connected to the outer tube (42); The support tube (47) is arranged between the lower die seat (13) and the first base (12), is coaxially sleeved on the outer tube (42), and is also connected to the lower die seat (13); The shock absorbing spring (48) is arranged between the lower die seat (13) and the first base (12), one end of which is connected to the lower die seat (13) and the other end of which is connected to the first base (12), and is sleeved on the outer tube (42) inside the support tube (47), and the length of the shock absorbing spring (48) is greater than the length of the support tube (47).

9. The mold that is easy to demould according to claim 8, characterized in that: The inflation and deflation mechanism (4) further comprises a bellows (49), which is sleeved on the inner tube (44), one end of which is sealedly connected to the inner tube (44), and the other end of which is sealedly connected to an end of the outer tube (42) away from the lower mold (21); The inner tube (44) is also dynamically sealed to the linear bearing (43).

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