A rapid cooling injection molding apparatus and process for plastic watch cases

Abstract

This invention discloses a rapid cooling injection molding apparatus and process for plastic watch cases. The apparatus includes a housing, a driving component on one side of the housing, and a sliding housing sealed and installed inside the housing on one side. The sliding housing is slidably installed within a sealed cavity inside the housing and is driven by the driving component outside the housing, reciprocating along the length of the sealed cavity. An injection mold is vertically floating within the sliding cavity of the sliding housing. A sealing ring is located at the bottom of the outer surface of the injection mold and is movably sealed within a movable housing. This invention, by floating the injection mold within the sliding housing and sliding the sliding housing within a sealed cavity, effectively improves the injection molding quality, increases cooling efficiency, and enables rapid unloading of the molded product, eliminating the need for a complex mold structure.

Description

Technical Field

[0001] This invention relates to the field of injection molds, and more specifically to an injection molding apparatus and process for rapidly cooling plastic watch cases. Background Technology

[0002] Injection molds are key tools used in manufacturing plastic products. They are created by injecting molten plastic into a predetermined mold, allowing the plastic to cool and solidify into a part of a specific shape. While injection molds play a vital role in modern manufacturing, traditional injection mold design and operation methods have some problems and limitations.

[0003] A key issue is managing thermal balance. During injection molding, the mold must be maintained at a suitable temperature that is neither too high nor too low. If the mold temperature is too low, the molten plastic may begin to cool and solidify before filling the mold, leading to incomplete filling or short shots. This not only affects product quality but can also cause production interruptions. Conversely, if the mold temperature is too high, while it facilitates plastic flow and filling, it significantly increases the product's cooling time, reduces production efficiency, and may result in defects due to insufficient cooling.

[0004] Furthermore, traditional injection molds present operational inconveniences in terms of mold opening, ejection, and unloading. Molds typically require complex opening mechanisms to ensure precise opening and closing, which increases design and manufacturing costs and complicates maintenance. Simultaneously, the complexity of the ejection mechanism increases the overall design difficulty of the mold, easily leading to unloading difficulties, especially for complex or small parts.

[0005] During the injection process, traditional static injection methods can also lead to a series of problems. Due to uneven material filling, air bubbles or voids can easily form inside the product, affecting the structural integrity and appearance quality of the product. In addition, uneven material distribution may also cause warping or stress concentration inside the component, affecting the performance and durability of the final product. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a rapid cooling plastic watch case injection molding apparatus and process method. By moving a sliding shell within a sealed space and housing a floating injection mold inside the sliding shell, the invention effectively overcomes many shortcomings of the prior art through movement and other operations.

[0007] This invention is achieved through the following technical solution:

[0008] A rapid cooling plastic watch case injection molding device includes: a device housing, a driving component disposed on one side of the device housing, and a sliding housing sealed and installed on one side inside the device housing. The sliding housing is slidably installed in a sealed cavity inside the device housing, and the sliding housing is driven by the driving component outside the device housing and slides back and forth along the length direction of the sealed cavity.

[0009] The injection mold is installed in a sliding cavity inside the sliding housing in a floating manner. A sealing ring is provided at the bottom of the outer circular surface of the injection mold. The sealing ring is movably sealed and installed in the movable housing, and an air inlet cavity is formed at the bottom of the sealing ring. A clearance space is formed at the top of the sealing ring.

[0010] At least one first one-way air inlet valve is provided on the side of the sliding housing facing the direction of movement. The first one-way air inlet valve corresponds to the air inlet chamber. When the sliding housing moves along the length direction of the sealing chamber, the gas in the sealing chamber passes through the first one-way air inlet valve and enters the air inlet chamber. Then, the gas pressed into the air inlet chamber pushes the injection mold to float up along the sliding housing. Part of the air that enters is compressed and stored in multiple air storage mechanisms provided on the bottom surface of the injection mold.

[0011] A cooling mechanism is provided on the bottom surface of the sliding cavity. When the injection mold descends, it comes into contact with the cooling mechanism to cool the raw materials inside the injection mold.

[0012] The sealed cavity of the device housing is divided into three areas, including an initial area, an injection cooling area, and a material unloading area. When the sliding housing moves from the initial area to the injection cooling area and injects raw material, air enters the bottom of the injection mold and it is in a floating state. After the injection mold finishes injection, the air in the air inlet cavity is discharged. At this time, the injection mold descends and contacts the cooling mechanism to cool the raw material inside the injection mold.

[0013] As the cooled injection mold moves toward the unloading area, the air in the sealed cavity enters the air intake cavity. The incoming gas pushes the injection mold to float upwards, while some of the gas continues to be compressed and enters multiple air storage mechanisms. When the upper and lower molds of the injection mold separate, the compressed gas in the multiple air storage mechanisms is released and the product is pushed out for unloading.

[0014] As a preferred technical solution, a small air inlet / outlet hole is provided on one side of the sliding housing, and the small air inlet / outlet hole corresponds to the clearance space;

[0015] A vent pipe is also provided on the sliding housing at the position corresponding to the air inlet chamber. A solenoid valve is installed on the vent pipe. The solenoid valve is controlled to open and close by the control host outside the device housing. The vent pipe discharges the gas in the air inlet chamber into the device housing. The space on the side of the sliding housing near the drive component forms a vent chamber. The gas in the clearance space is discharged into the vent chamber through the air inlet and outlet holes.

[0016] An opening window is also provided on the device housing located on the same side as the air inlet and outlet holes, through which the venting chamber communicates with the outside.

[0017] As a preferred technical solution, the injection mold includes an upper mold and a lower mold, and an injection cavity is formed in the upper mold and the lower mold. A plurality of first electromagnets are provided at the mating surface of the upper mold relative to the lower mold, and a corresponding metal suction block is provided on the lower mold corresponding to the first electromagnets.

[0018] When the first electromagnet is energized, it attracts the metal block, thus sealing and fixing the upper and lower molds. The gas storage mechanism is located in the bottom surface of the lower mold. At least one pressure relief hole is provided between the gas storage mechanism and the injection cavity. Each pressure relief hole is sealed or opened by a linkage sealing mechanism.

[0019] When the upper mold and lower mold are adsorbed, the pressure relief hole is sealed by the linkage sealing mechanism. When the upper mold and lower mold are separated, the pressure relief hole is opened. At this time, the compressed gas in the gas storage mechanism passes through the pressure relief hole into the injection cavity and ejects the injection molded product from the injection cavity.

[0020] As a preferred technical solution, the gas storage mechanism includes a gas storage channel formed in the lower mold. A compression piston, a first support spring, and an inlet / outlet tube are installed in the gas storage channel. One side of the first support spring contacts one side of the gas storage channel, and the other side contacts and supports the compression piston. The compression piston is pushed out by the first support spring, forming a gas storage space on one side of the compression piston and an inlet / outlet channel on the other side of the compression piston. The inlet / outlet tube is installed on the bottom surface of the inlet / outlet channel. A one-way outlet valve is installed on the inlet / outlet tube to realize one-way gas outlet. An air intake micro-hole communicating with the inlet / outlet channel is also provided on one side of the inlet / outlet tube.

[0021] The linkage sealing mechanism is installed in the gas storage space. The bottom of the lower mold is provided with a second one-way air inlet valve for each gas storage space. Part of the gas in the air inlet chamber passes through the second one-way air inlet valve and enters the gas storage space.

[0022] As a preferred technical solution, the linkage sealing mechanism includes a linkage sealing rod, a linkage lever, a hinge shaft, a second support spring, and a linkage sealing plug. The linkage sealing rod is disposed in the shaft cavity opened in the lower mold.

[0023] The linkage sealing rod is provided with multiple O-rings from top to bottom on its outside. The linkage sealing rod is in sealing contact with the shaft cavity through the multiple O-rings. The linkage lever is installed in the installation channel opened on the bottom surface of the gas storage channel. The hinge shaft passes through the linkage lever and is hinged in the installation channel. The second support spring is set at the bottom of the linkage lever and is located at the far end of the hinge shaft. The second support spring supports the linkage lever and the linkage sealing rod.

[0024] The bottom of the linkage sealing rod passes through the shaft cavity and is fixed to the linkage lever. The top of the linkage sealing rod is lifted by the second support spring and extends to the top surface of the lower mold. The linkage lever extends toward the pressure relief hole, and the linkage sealing plug is installed on the linkage lever. When the upper mold and the lower mold are sealed together, the linkage sealing rod is pressed down by the upper mold, the linkage lever is raised, and the linkage sealing plug is sealed into the pressure relief hole.

[0025] As a preferred technical solution, the bottom of the sliding housing is provided with multiple contact grooves along the length direction. The bottom surface of the sealing cavity of the device housing is provided with a guide slide plate corresponding to each contact groove. The guide slide plate is slidably snapped into the contact groove. Multiple sealing contact layers are provided in the contact groove along the length direction of the contact groove. When the guide slide plate is snapped into the contact groove, the multiple sealing contact layers are in sealing contact with the guide slide plate.

[0026] The cooling mechanism includes cooling contact plates mounted on guide slides, each equipped with a semiconductor cooling chip. The cold side of the semiconductor cooling chip is in contact with the cooling contact plate, and the hot side of the semiconductor cooling chip is in contact with the bottom surface of the device housing. A heat dissipation base plate is mounted on the bottom of the device housing. Multiple heat-conducting needles are arranged inside the device housing. One end of each heat-conducting needle is in contact with the hot side of the semiconductor cooling chip, and the other end is in contact with the heat dissipation base plate. The cooling contact plates are located within the injection cooling area. The width of the cooling contact plates is equal to the width of the guide slides. The guide slides are made of non-metallic material, while the cooling contact plates are made of metallic material. The semiconductor cooling chips are controlled and powered by a control host.

[0027] The cooling mechanism also includes a cooling contact groove formed on the bottom surface of the injection mold and a cooling conduction plate set on the bottom surface of the sliding cavity. The cooling contact groove is set away from the gas storage mechanism. The entire injection mold is made of metal material. When the cooling conduction plate is snapped into the cooling contact groove, the entire injection mold is cooled by the cooling conduction plate.

[0028] When the sliding housing slides to the position of the cooling contact plate, the cooling contact plate cools the bottom surface of the sliding housing, and also cools the cooling conduction plate.

[0029] As a preferred technical solution, the top of the sliding housing is provided with a movable top cover, which is snapped into a top cover mounting cavity opened on the top of the sliding housing. The movable top cover is provided with a first injection hole, and the top of the injection mold opposite the first injection hole is provided with a second injection hole. The top of the injection cooling area is provided with an injection needle. When the injection mold moves into the injection cooling area, the injection needle passes through the first injection hole and the second injection hole and is inserted into the injection mold for injection.

[0030] A second electromagnet is installed on the top of the injection mold, and a third electromagnet is provided at the bottom of the movable top cover corresponding to the second electromagnet. When both the second and third electromagnets are energized, they are magnetically attracted together, and the first electromagnet is de-energized. At this time, the upper mold and the lower mold of the injection mold are separated. The second and third electromagnets are both controlled and powered by the control host.

[0031] When the injection mold moves to the unloading area, the movable top cover and the upper mold are opened, and the injection-molded product is unloaded.

[0032] As a preferred technical solution, a discharge cover plate is provided at the top of the discharge area, and a fourth electromagnet is provided at the bottom of the discharge cover plate. When the injection mold moves to the bottom position of the discharge cover plate, the fourth electromagnet is energized and attracts the movable top cover at the top of the injection mold. The discharge cover plate, the movable top cover and the upper mold are removed outward, and the product is taken out. The fourth electromagnet is controlled and powered by the control host.

[0033] As a preferred technical solution, a viewing window is installed on the side of the device housing away from the driving component. The driving component is a driving cylinder. Multiple antenna-type telescopic rods are also provided on the sealing ring, and the top of the antenna-type telescopic rods is embedded in the top surface of the sliding housing.

[0034] The present invention provides a rapid cooling injection molding process for a plastic watch case, comprising the following specific steps:

[0035] S1. Prepare the molten injection material, and use the driving component to drive the sliding shell from the initial area into the injection cooling area and then stop.

[0036] S2. When the initial area enters the injection cooling area, the gas in the sealed cavity will pass through the first one-way air inlet valve into the air inlet cavity, and the gas entering will make the entire injection mold float to the top. The excess gas will enter the gas storage mechanism for compression and storage.

[0037] S3. The injection mold is in a floating state and located at the top of the sliding shell. At this time, the injection head injects the prepared injection material into the injection cavity until the injection is completed.

[0038] S4. After injection, the solenoid valve opens and discharges the gas in the air inlet chamber. At this time, the injection mold descends under its own weight and comes into contact with the cooling mechanism to cool the injected material.

[0039] S5. After cooling is complete, the driving component continues to push the injection mold to the unloading area. During the pushing process, the gas in the sealed cavity will enter the air inlet cavity. At this time, the injection mold is pushed to the top, and the excess gas enters the air storage mechanism for further compression and storage.

[0040] S6. After reaching the unloading area, the first electromagnet is de-energized, and the second and third electromagnets are attracted. At this time, the lower mold is affected by gravity and separates from the upper mold. At the same time, the linkage sealing mechanism opens the pressure relief hole, and the stored pressure gas passes through the pressure relief hole and ejects the injection-molded product. The unloading cover plate, movable top cover and upper mold are taken out and the product is removed.

[0041] The beneficial effects of the present invention are as follows: 1. The injection mold of the present invention is set in a sealed device housing. During the movement, the gas generated by the moving extrusion can be used to make the injection mold float up and move away from the cooling mechanism. At this time, the molten liquid material can be in an optimal injection temperature environment, and the injected molten material will not solidify too quickly due to the influence of the cooling mechanism at the bottom. The requirement for temperature balance is greatly reduced. In addition, the floating injection mold can help the molten plastic to be distributed more evenly in the mold cavity during the injection process, reducing the internal stress of the plastic part. Furthermore, the slight movement of the bottom mold can compensate for the thermal expansion and contraction of the material, which helps to reduce the warping and deformation of the finished product, and is more conducive to the discharge of air bubbles.

[0042] Second, after the injection is completed, the gas in the air inlet chamber only needs to be discharged so that the injection mold can descend and contact the cooling mechanism. The cooling mechanism can then immediately cool the injected liquid material without controlling the temperature of the cooling mechanism. This greatly reduces the requirements for thermal balance and can significantly improve the cooling efficiency.

[0043] Third, since the present invention accumulates a large amount of compressed gas during the movement process, this accumulated compressed gas can be discharged through the pressure relief hole when the upper mold and the lower mold separate, impacting the product in the lower mold and causing the product in the lower mold to detach quickly, thus achieving the purpose of rapid demolding. Since the first electromagnet is de-energized, the lower mold can achieve automatic separation from the upper mold. At the same time as separation, the gas discharged from the pressure relief hole can immediately separate the product in the lower mold, which greatly improves the demolding efficiency of the entire injection mold and makes reasonable use of the moving resources. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 For the overall structure of this invention;

[0046] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0047] Figure 3 This is a schematic diagram of the internal cross-section of the present invention;

[0048] Figure 4 This is a partial enlarged cross-sectional view of the present invention;

[0049] Figure 5 For the present invention Figure 3 A magnified view of a section at point A in the middle;

[0050] Figure 6 For the present invention Figure 3 A magnified view of a section at point B in the middle;

[0051] Figure 7 This is a three-dimensional structural diagram of the injection mold of the present invention;

[0052] Figure 8 This is a cross-sectional schematic diagram from another perspective of the present invention;

[0053] Figure 9 This is a schematic diagram of the bottom structure of the sliding housing of the present invention;

[0054] Explanation of reference numerals in the attached figures:

[0055] 1. Device housing; 2. Control unit; 3. Drive cylinder; 4. Heat dissipation base plate; 5. Injection needle; 6. Unloading cover plate; 7. First injection hole; 8. Movable top cover; 9. Guide slide; 10. Cooling contact plate; 11. First one-way air inlet valve; 12. Sliding housing; 13. Viewing window; 15. Fourth electromagnet; 17. Third electromagnet; 18. Lower mold; 19. Vent pipe; 20. Sealing ring; 21. Compression piston; 22. First support spring; 23. Air storage channel; 24. Inlet and outlet air pipes; 27. Unloading area; 28. Injection cooling zone; 29. ​​Second electromagnet; 30. Injection cavity; 31. Linkage sealing rod; 32. First electromagnet; 33. Upper mold; 34. Second injection hole; 35. Linkage lever; 36. Installation channel; 37. Second support spring; 38. Hinge shaft; 39. Linkage sealing plug; 40. Pressure relief hole; 41. Second one-way air intake valve; 42. Cooling conduction plate; 44. Antenna-type telescopic rod; 45. Air intake cavity; 46. Cooling contact groove; 47. Contact groove; 48. Sealing contact layer; 100. Small air inlet and outlet holes. Detailed Implementation

[0056] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0057] Any feature disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by other equivalent or similar features for a similar purpose, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0058] like Figure 1 and Figure 2 As shown, the present invention provides a rapid cooling plastic watch case injection molding apparatus and process method, including an apparatus housing 1, a driving component disposed on one side of the apparatus housing 1, and a sliding housing 12 sealed and installed on one side inside the apparatus housing 1. The sliding housing 12 is slidably installed in a sealed cavity inside the apparatus housing 1. The sliding housing 12 is driven by the driving component outside the apparatus housing 1 and slides back and forth along the length direction of the sealed cavity.

[0059] It also includes an injection mold, which is installed in a sliding cavity inside the sliding housing 12 in a floating manner. A sealing ring 20 is provided at the bottom of the outer circular surface of the injection mold. The sealing ring 20 is movably sealed in the movable housing and forms an air inlet chamber 45 at the bottom of the sealing ring 20. A clearance space is formed at the top of the sealing ring 20. When air enters the air inlet chamber 45, the entire injection mold floats up. With continuous air intake, the injection mold will eventually rise to the top and stop moving, while the excess gas will accumulate.

[0060] A first one-way air inlet valve 11 is provided on the side of the sliding housing 12 facing the direction of movement. The first one-way air inlet valve 11 corresponds to the air inlet chamber 45. When the sliding housing 12 moves along the length of the sealing chamber, the gas in the sealing chamber passes through the first one-way air inlet valve 11 and enters the air inlet chamber 45. Then, the gas pressed into the air inlet chamber 45 pushes the injection mold to float up along the sliding housing 12. Part of the air that enters is compressed and stored in multiple air storage mechanisms provided on the bottom surface of the injection mold. Because of the first one-way air inlet valve 11, when the sliding housing 12 slides, the gas can only pass through the first one-way air inlet valve 11 and enter the air inlet chamber 45, but cannot be discharged from the first one-way air inlet valve 11. The entire exterior of the sliding housing 12 needs to be sealed to ensure the sealing during the sliding process, so that the gas can be squeezed into the air inlet chamber 45.

[0061] It also includes a cooling mechanism, which is located on the bottom surface of the sliding cavity. When the injection mold descends, it comes into contact with the cooling mechanism to cool the raw material inside the injection mold. The cooling mechanism does not come into contact with the injection module during injection, so the injection mold only needs to maintain a relatively suitable injection temperature. When liquid plastic is injected into the injection mold, it will not cool and solidify immediately, while the cooling mechanism can maintain a lower ambient temperature.

[0062] like Figure 3 As shown, the sealed cavity of the device housing 1 is divided into three areas, including an initial area, an injection cooling area 28, and an unloading area 27. When the sliding housing 12 moves from the initial area to the injection cooling area 28 and injects raw materials, the bottom of the injection mold is air-intaken and in a floating state. During the injection process, the upper and lower ends of the injection module will not be magnetically attracted, and it has a certain slight floating ability. The vibration force generated by the injection makes the injected liquid more complete and uniform. The slight vibration force is used to remove air bubbles. Therefore, this floating injection method will significantly improve the final molding quality of the product. After the injection mold is completed, the air in the air inlet cavity 45 is discharged. At this time, the injection mold descends and contacts the cooling mechanism to cool the raw materials inside the injection mold. Since the cooling mechanism is at a low temperature, the injection mold can be cooled immediately after contacting it, which reduces the occurrence of the molten liquid cooling and solidifying before the injection is full due to the influence of the cooling mechanism on the mold temperature.

[0063] As the cooled injection mold moves toward the unloading area 27, air in the sealed cavity enters the air inlet cavity 45. The incoming gas pushes the injection mold upward, while some of the gas continues to be compressed and enters multiple gas storage mechanisms. When the upper mold 33 of the injection mold separates from the lower mold 18, the compressed gas in the multiple gas storage mechanisms is released and the product is ejected for unloading. Here, the present invention utilizes the continuously accumulated compressed gas during the movement process, which is ultimately used for unloading the product. In this way, the present invention does not require additional complex unloading mechanisms for the mold, making full use of resources, simplifying the overall structure, and improving the unloading efficiency after the product injection is completed.

[0064] Among them, such as Figure 3 As shown, a small air inlet / outlet hole 100 is provided on one side of the sliding housing 12. The small air inlet / outlet hole 100 corresponds to the retraction space. When the injection mold floats up, the gas in the retraction space can be discharged from the small air inlet / outlet hole 100.

[0065] Among them, such as Figure 3 and Figure 4 As shown, a vent pipe 19 is also provided on the sliding housing 12 at the position corresponding to the air inlet chamber 45. A solenoid valve is installed on the vent pipe 19. The solenoid valve is controlled to open and close by the control host 2 outside the device housing 1. The vent pipe 19 discharges the gas in the air inlet pipe into the device housing 1. The space on the side of the sliding housing 12 near the drive component forms a vent chamber. The gas in the clearance space is discharged into the vent chamber through the air inlet and outlet holes 100. When the air inlet chamber 45 needs to be filled with air, the solenoid valve is in a closed state, that is, it is closed during the injection process and closed during the movement of the sliding housing 12. When it is necessary to discharge the gas in the air inlet chamber 45, the solenoid valve is open. When the solenoid valve is open, the gas in the air inlet chamber 45 is discharged, and the injection mold can slowly descend with the continuously discharged gas. Therefore, when it is necessary to cool down after injection, as long as the solenoid valve is opened, the entire injection mold can slowly descend and eventually contact the cooling mechanism to achieve rapid cooling.

[0066] In order to maintain a balance with the external environment, in this embodiment, the device housing 1 located on the same side as the air inlet and outlet holes 100 is also provided with an opening window. The venting chamber is connected to the outside through the opening window, and the gas entering the venting chamber can be discharged into the atmosphere.

[0067] like Figure 4 As shown, the injection mold includes an upper mold 33 and a lower mold 18. An injection cavity 30 is formed in the upper mold 33 and the lower mold 18. A plurality of first electromagnets 32 are provided at the mating surface of the upper mold 33 relative to the lower mold 18. Corresponding metal suction blocks are provided on the lower mold 18 corresponding to the first electromagnets 32.

[0068] When the first electromagnet 32 ​​is energized, it attracts the metal block. At this time, the upper mold 33 and the lower mold 18 are sealed and fixed. The gas storage mechanism is arranged in the bottom surface of the lower mold 18. At least one pressure relief hole 40 is provided between the gas storage mechanism and the injection cavity 30. The pressure relief hole 40 is sealed or opened by a linkage sealing mechanism.

[0069] When the upper mold 33 and the lower mold 18 are adsorbed, the pressure relief hole 40 is sealed by the linkage sealing mechanism. When the upper mold 33 and the lower mold 18 are separated, the pressure relief hole 40 is open. At this time, the compressed gas in the gas storage mechanism passes through the pressure relief hole 40 and enters the injection cavity 30 and ejects the injection molded product in the injection cavity 30.

[0070] like Figure 5 and Figure 6 As shown, each gas storage mechanism includes a gas storage channel 23 formed in the lower mold 18. A compression piston 21, a first support spring 22, and an inlet / outlet pipe 24 are installed within each gas storage channel 23. One side of the first support spring 22 contacts one side of the gas storage channel 23, and the other side contacts and supports the compression piston 21. The first support spring 22 pushes out the compression spring, forming a gas storage space on one side of the compression piston 21 and an inlet / outlet channel on the other side. The inlet / outlet pipe 24 is installed within the gas storage channel 23. One-way exhaust valves are installed on the bottom surface of the air inlet and outlet channels, and the air inlet and outlet tubes 24 are installed to realize one-way air outlet. The air inlet and outlet tubes 24 can only outlet air. In order to allow the compression piston 21 to return to its original position after compression, a suction micro-hole can also be provided on one side of the air inlet and outlet tubes 24. When the first support spring 22 pushes the compression piston 21, gas will be drawn into the air inlet and outlet channels through the suction micro-hole to balance the cylinder, while the compressed gas in the air storage space will be discharged through the pressure relief hole 40, thereby pushing open the product and achieving the purpose of unloading.

[0071] The linkage sealing mechanism is installed in the gas storage space. The bottom of the lower mold 18 is provided with a second one-way air inlet valve 41 for each gas storage space. The gas inside the air inlet chamber 45 passes through the second one-way air inlet valve 41 and enters the gas storage space. Only air can be introduced. The air in the gas storage space cannot be discharged from the second one-way air inlet valve 41. When gas enters the air inlet chamber 45, the entire injection mold can only float up due to the setting of the sealing ring 20. After floating to the top, the excess gas will pass through the second one-way air inlet valve 41 and be compressed and stored in the gas storage mechanism. The compression piston 21 is compressed and the first support spring 22 is compressed. The gas storage amount gradually increases. As gas continues to enter, the elastic pressure of the first support spring 22 becomes larger and larger. In this way, the gas pressure is continuously stored by moving the sliding shell 12.

[0072] like Figure 5As shown, each linkage sealing mechanism includes a linkage sealing rod 31, a linkage lever 35, a hinge shaft 38, a second support spring 37, and a linkage sealing plug 39. The linkage sealing rod 31 is disposed in the shaft cavity opened in the lower mold 18.

[0073] To enhance sealing, multiple O-rings are provided on the outside of the linkage sealing rod 31 from top to bottom. The linkage sealing rod 31 is in sealing contact with the shaft cavity through the multiple O-rings. The linkage lever 35 is installed in the installation channel 36 opened on the bottom surface of the gas storage channel 23. The hinge shaft 38 passes through the linkage lever 35 and is hinged in the installation channel 36. The second support spring 37 is located at the bottom of the linkage lever 35 and at the far end of the hinge shaft 38. The second support spring 37 lifts up the linkage lever 35 and the linkage sealing rod 31.

[0074] The bottom of the linkage sealing rod 31 passes through the shaft cavity and is fixedly connected to the linkage lever 35. The top of the linkage sealing rod 31 is lifted by the second support spring 37 and extends to the top upper surface of the lower mold 18. The linkage sealing rod 31 extends towards the pressure relief hole 40, and the linkage sealing plug 39 is installed on the linkage sealing rod 31. When the upper mold 33 and the lower mold 18 are sealed together, the linkage sealing rod 31 and the upper mold 33 are pressed down, causing the linkage lever 35 to tilt up, and the linkage sealing plug 39 to be sealed into the pressure relief hole 40. When the upper mold 33 and the lower mold 18 are separated, the second support spring 37 lifts the linkage lever 35. The sealing rod 31 and the linkage lever 35 rotate along the hinge shaft 38. As the second support spring 37 pushes up the linkage lever 35, the linkage sealing plug 39 will separate from the pressure relief hole 40 to achieve conduction. At this time, the pressurized gas can pass through the pressure relief hole 40 to achieve the purpose of unloading. Therefore, when the unloading area 27 is reached, the first electromagnet 32 ​​will be de-energized, and the second electromagnet 29 and the third electromagnet 17 will be attracted. At this time, under the influence of gravity, the lower mold 18 will descend, and high-pressure gas will be ejected from the pressure relief hole 40 to push out the product in the lower mold 18, achieving rapid unloading without the need to set up an ejector mechanism.

[0075] like Figure 2 , Figure 3 , Figure 7 as well as Figure 8 As shown, the bottom of the sliding housing 12 has multiple contact grooves 47 along its length. A guide slide 9 is provided on the bottom surface of the sealing cavity of the device housing 1 at a position corresponding to each contact groove 47. The guide slide slidably engages with the contact groove 47. Multiple sealing contact layers 48 are provided within the contact groove 47 along its length. When the guide slide 9 engages with the contact groove 47, the multiple sealing contact layers 48 form a sealing contact with the guide slide 9. Figure 9As shown, by setting a sealing contact layer 48, the sealing performance between the contact groove 47 and the guide slide 9 can be increased to prevent air leakage at the sliding position. The sealing contact layer 48 can be made of materials such as wear-resistant rubber. When the contact groove 47 and the guide slide 9 are slidably assembled, they can be fitted in a tighter manner to increase the contact sealing performance.

[0076] The cooling mechanism includes a cooling contact plate 10 mounted on a guide slide 9. Each cooling contact plate 10 is equipped with a semiconductor cooling chip. The cold side of the semiconductor cooling chip is in contact with the cooling contact plate 10, and the hot side of the semiconductor cooling chip is in contact with the bottom surface of the device housing 1. A heat dissipation base plate 4 is mounted at the bottom of the device housing 1. Multiple heat-conducting needles (not shown) are arranged inside the device housing 1. One end of each heat-conducting needle is in contact with the hot side of the semiconductor cooling chip, and the other end is in contact with the heat dissipation base plate 4. The cooling contact plate 10 is located within the injection cooling area 28. The width of the cooling contact plate 10 is equal to the width of the guide slide 9. The guide slide 9 is made of non-metallic material, while the cooling contact plate 10 is made of metallic material. The semiconductor cooling chips are all controlled and powered by the control host 2.

[0077] The cooling mechanism also includes a cooling contact groove 46 formed on the bottom surface of the injection mold and a cooling conduction plate 42 set on the bottom surface of the sliding cavity. The cooling contact groove 46 is set away from the gas storage mechanism. The entire injection mold is made of metal material. When the cooling conduction plate 42 is inserted into the cooling contact groove 46, the cooling conduction plate 42 cools the entire injection mold.

[0078] When the sliding housing 12 slides to the position of the cooling contact plate 10, the cooling contact plate 10 cools the bottom surface of the sliding housing 12, and also cools the cooling conduction plate 42. During injection molding, it is in a floating state, and its bottom does not contact the cooling mechanism. Figure 8 As shown.

[0079] like Figure 3 and Figure 7 As shown, a movable top cover 8 is provided on the top of the sliding housing 12. The movable top cover 8 is snapped into the top cover mounting cavity opened on the top of the sliding housing 12. A first injection hole 7 is provided on the movable top cover 8. A second injection hole 34 is provided on the top of the injection mold opposite to the first injection hole 7. An injection needle 5 is provided on the top of the injection cooling area 28. When the injection mold is moved into the injection cooling drive, the injection needle 5 is inserted into the injection mold through the first injection hole 7 and the second injection hole 34 for injection. The injection needle 5 can be driven by an external injection drive mechanism for injection, which will not be described in detail here.

[0080] A second electromagnet 29 is installed on the top of the injection mold, and a third electromagnet 17 is provided at the bottom of the movable top cover 8 corresponding to the second electromagnet 29. When both the second electromagnet 29 and the third electromagnet 17 are energized, they are magnetically attracted together, and the first electromagnet 32 ​​is de-energized. At this time, the upper mold 33 of the injection mold is separated from the lower mold 18. The second electromagnet 29 and the third electromagnet 17 are both controlled and powered by the control host 2.

[0081] When the injection mold moves to the unloading area 27, the movable top cover 8 and the upper mold 33 are opened, and the injection-molded product is unloaded.

[0082] The unloading area 27 is provided with an unloading cover plate 6 at the top and a fourth electromagnet 15 at the bottom of the unloading cover plate 6. When the injection mold moves to the bottom position of the unloading cover plate 6, the fourth electromagnet 15 is energized and attracts the movable top cover 8 at the top of the injection mold. After the unloading cover plate 6, the movable top cover 8 and the upper mold 33 are taken out, the product is taken out. The fourth electromagnet 15 is controlled and powered by the control host 2.

[0083] For ease of observation, in this embodiment, a viewing window 13 is installed on the side of the device housing 1 away from the driving component. The driving component is a driving cylinder 3. Multiple antenna-type telescopic rods 44 are provided on the sealing ring 20. The top of the antenna-type telescopic rods 44 is embedded in the top surface of the sliding housing 12.

[0084] The present invention provides a rapid cooling injection molding process for a plastic watch case, comprising the following specific steps:

[0085] (a) Prepare the molten injection material, and use the driving component to drive the sliding shell 12 from the initial area into the injection cooling area 28 and then stop;

[0086] (ii) When the initial region enters the injection cooling region 28, the gas in the sealed cavity will pass through the first inlet valve and enter the inlet cavity 45. The gas entering will cause the entire injection mold to float to the top. The excess gas will enter the gas storage mechanism for compression and storage.

[0087] (iii) When the injection mold is in a floating state and located at the top of the sliding housing 12, the injection head injects the prepared injection material into the injection cavity 30 until the injection is completed;

[0088] (iv) After injection, the solenoid valve opens and the gas in the air inlet chamber 45 is discharged. At this time, the injection mold is lowered by its own weight and comes into contact with the cooling mechanism to cool the injected material.

[0089] (v) After cooling is completed, the driving component continues to push the injection mold to the unloading area 27. During the pushing process, the gas in the sealed cavity will enter the air inlet cavity 45. At this time, the injection mold is pushed to the top, and the excess gas enters the gas storage mechanism for further compression and storage.

[0090] (vi) After reaching the unloading area 27, the first electromagnet 32 ​​is de-energized, and the second electromagnet 29 and the third electromagnet 17 are attracted. At this time, the lower mold 18 is affected by gravity and separates from the upper mold 33. At the same time, the linkage sealing mechanism opens the pressure relief hole 40, and the stored pressure gas passes through the pressure relief hole 40 and ejects the injection-molded product. The unloading cover plate 6, the movable top cover 8 and the upper mold 33 are taken out and the product is removed.

[0091] The injection mold of the present invention is set in a sealed device housing 1. During the movement, the gas generated by the moving extrusion can make the injection mold float up and move away from the cooling mechanism. At this time, the molten liquid material can be in an optimal injection temperature environment, and the injected molten material will not solidify too quickly due to the influence of the cooling mechanism at the bottom. The requirement for temperature balance is greatly reduced. In addition, the floating injection mold can help the molten plastic to be distributed more evenly in the mold cavity during the injection process, reducing the internal stress of the plastic part. Furthermore, the slight movement of the bottom mold can compensate for the thermal expansion and contraction of the material, which helps to reduce the warping and deformation of the finished product, and is more conducive to the discharge of air bubbles.

[0092] After injection, this invention only needs to exhaust the gas in the air inlet chamber 45 so that the injection mold can descend and contact the cooling mechanism. The cooling mechanism can then immediately cool the injected liquid material without needing to control the temperature of the cooling mechanism, greatly reducing the requirements for thermal balance and significantly improving cooling efficiency.

[0093] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions conceived without inventive effort should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A rapid cooling injection molding apparatus for plastic watch cases, characterized in that, include: The device housing (1) has a driving component on one side and a sliding housing (12) sealed on one side inside the device housing (1). The sliding housing (12) is slidably installed in the sealed cavity inside the device housing (1). The sliding housing (12) is driven by the driving component outside the device housing (1) and slides back and forth along the length of the sealed cavity. The injection mold is installed in the sliding cavity inside the sliding housing (12) in a floating manner. A sealing ring (20) is provided at the bottom of the outer circular surface of the injection mold. The sealing ring (20) is movably sealed and installed in the movable housing, and an air inlet cavity (45) is formed at the bottom of the sealing ring (20). A clearance space is formed at the top of the sealing ring (20). The sliding housing (12) is provided with at least one first one-way air inlet valve (11) on the side facing the direction of movement. The first one-way air inlet valve (11) corresponds to the air inlet chamber (45). When the sliding housing (12) moves along the length of the sealing chamber, the gas in the sealing chamber passes through the first one-way air inlet valve (11) and enters the air inlet chamber (45). Then, the gas pressed into the air inlet chamber (45) pushes the injection mold to float up along the sliding housing (12). Part of the air that enters is compressed and stored in multiple air storage mechanisms provided on the bottom surface of the injection mold. A cooling mechanism is provided on the bottom surface of the sliding cavity. When the injection mold descends, it comes into contact with the cooling mechanism to cool the raw materials inside the injection mold. The sealed cavity of the device housing (1) is divided into three areas, including an initial area, an injection cooling area (28) and a discharge area (27). When the sliding housing (12) moves from the initial area to the injection cooling area (28) and injects raw materials, air enters the bottom of the injection mold and it is in a floating state. After the injection mold is completed, the air in the air inlet cavity (45) is discharged. At this time, the injection mold descends and contacts the cooling mechanism to cool the raw materials inside the injection mold. When the cooled injection mold moves toward the unloading area (27), the air in the sealed cavity enters the air inlet cavity (45), and the incoming gas pushes the injection mold to float up. Some of the gas continues to be compressed and enters multiple gas storage mechanisms. When the upper mold (33) and lower mold (18) of the injection mold are separated, the compressed gas in multiple gas storage mechanisms is released and the product is pushed out for unloading.

2. The rapid cooling plastic watch case injection molding apparatus according to claim 1, characterized in that: A small air inlet / outlet hole (100) is provided on one side of the sliding housing (12), and the small air inlet / outlet hole (100) corresponds to the recess space; A vent pipe (19) is also provided on the sliding housing (12) at the position corresponding to the air inlet chamber (45). A solenoid valve is installed on the vent pipe (19). The solenoid valve is controlled to open and close by the control host (2) outside the device housing (1). The vent pipe (19) discharges the gas in the air inlet chamber into the device housing (1). A vent chamber is formed in the space near the drive component of the sliding housing (12). The gas in the clearance space is discharged into the vent chamber through the air inlet and outlet holes (100). An opening window is also provided on the device housing (1) located on the same side as the air inlet and outlet holes (100), and the venting chamber is connected to the outside through the opening window.

3. The rapid cooling plastic watch case injection molding apparatus according to claim 1, characterized in that: The injection mold includes an upper mold (33) and a lower mold (18). An injection cavity (30) is formed in the upper mold (33) and the lower mold (18). A plurality of first electromagnets (32) are provided at the mating surface of the upper mold (33) relative to the lower mold (18). A corresponding metal suction block is provided on the lower mold (18) corresponding to the first electromagnets (32). When the first electromagnet (32) is energized, it attracts the metal block. At this time, the upper mold (33) and the lower mold (18) are sealed and fixed. The gas storage mechanism is arranged in the bottom surface of the lower mold (18). At least one pressure relief hole (40) is provided between the gas storage mechanism and the injection cavity (30). The pressure relief hole (40) is sealed or opened by a linkage sealing mechanism. When the upper mold (33) and the lower mold (18) are adsorbed, the pressure relief hole (40) is sealed by the linkage sealing mechanism. When the upper mold (33) and the lower mold (18) are separated, the pressure relief hole (40) is opened. At this time, the compressed gas in the gas storage mechanism passes through the pressure relief hole (40) and enters the injection cavity (30) and ejects the injection molded product in the injection cavity (30).

4. The rapid cooling plastic watch case injection molding apparatus according to claim 3, characterized in that: Each gas storage mechanism includes a gas storage channel (23) opened in the lower mold (18). A compression piston (21), a first support spring (22), and an inlet / outlet pipe (24) are installed in the gas storage channel (23). One side of the first support spring (22) contacts one side of the gas storage channel (23), and the other side contacts and supports the compression piston (21). The compression piston (21) is pushed out by the first support spring (22), forming a gas storage space on one side of the compression piston (21) and an inlet / outlet channel on the other side of the compression piston (21). The inlet / outlet pipe (24) is installed on the bottom surface of the inlet / outlet channel. A one-way outlet valve is installed on the inlet / outlet pipe (24) to realize one-way gas outlet. A suction microhole communicating with the inlet / outlet channel is also provided on one side of the inlet / outlet pipe (24). The linkage sealing mechanism is installed in the gas storage space. The bottom of the lower mold (18) is provided with a second one-way air inlet valve (41) for each gas storage space. Part of the gas in the air inlet chamber (45) passes through the second one-way air inlet valve (41) and enters the gas storage space.

5. The rapid cooling plastic watch case injection molding apparatus according to claim 4, characterized in that: Each of the linkage sealing mechanisms includes a linkage sealing rod (31), a linkage lever (35), a hinge shaft (38), a second support spring (37), and a linkage sealing plug (39). The linkage sealing rod (31) is disposed in the shaft cavity opened in the lower mold (18). The linkage sealing rod (31) is provided with multiple O-rings from top to bottom on the outside. The linkage sealing rod (31) is in sealing contact with the shaft cavity through multiple O-rings. The linkage lever (35) is installed in the installation channel (36) opened on the bottom surface of the gas storage channel (23). The hinge shaft (38) passes through the linkage lever (35) and is hinged in the installation channel (36). The second support spring (37) is set at the bottom of the linkage lever (35) and is located at the far end of the hinge shaft (38). The second support spring (37) lifts up the linkage lever (35) and the linkage sealing rod (31). The bottom of the linkage sealing rod (31) passes through the shaft cavity and is connected and fixed to the linkage lever (35). The top of the linkage sealing rod (31) is lifted by the second support spring (37) and extends to the top upper surface of the lower mold (18). The linkage lever (35) extends toward the pressure relief hole (40), and the linkage sealing plug (39) is installed on the linkage lever (35). When the upper mold (33) and the lower mold (18) are sealed and closed, the linkage sealing rod (31) is pressed down by the upper mold (33), the linkage lever (35) is raised, and the linkage sealing plug (39) is sealed and snapped into the pressure relief hole (40).

6. The rapid cooling plastic watch case injection molding apparatus according to claim 1, characterized in that: The bottom of the sliding housing (12) is provided with multiple contact grooves (47) along the length direction. The bottom surface of the sealing cavity of the device housing (1) is provided with guide slides (9) corresponding to each contact groove (47). The guide slides are slidably snapped into the contact grooves (47). Multiple sealing contact layers (48) are provided in the contact grooves (47) along the length direction of the contact grooves (47). When the guide slides (9) are snapped into the contact grooves (47), the multiple sealing contact layers (48) are in sealing contact with the guide slides (9). The cooling mechanism includes a cooling contact plate (10) set on a guide slide (9). A semiconductor cooling chip is installed on each cooling contact plate (10). The cold side of the semiconductor cooling chip is in contact with the cooling contact plate (10). The hot side of the semiconductor cooling chip is in contact with the bottom surface of the device housing (1). A heat dissipation base plate (4) is installed at the bottom of the device housing (1). Multiple heat conduction needles are arranged inside the device housing (1). One end of the heat conduction needle is in contact with the hot side of the semiconductor cooling chip, and the other end of the heat conduction needle is in contact with the heat dissipation base plate (4). The cooling contact plate (10) is set in the injection cooling area (28). The width of the cooling contact plate (10) is equal to the width of the guide slide (9). The guide slide (9) is made of non-metallic material, and the cooling contact plate (10) is made of metallic material. The semiconductor cooling chips are all controlled and powered by the control host (2). The cooling mechanism also includes a cooling contact groove (46) on the bottom surface of the injection mold and a cooling conduction plate (42) on the bottom surface of the sliding cavity. The cooling contact groove (46) is set away from the gas storage mechanism. The entire injection mold is made of metal. When the cooling conduction plate (42) is inserted into the cooling contact groove (46), the entire injection mold is cooled by the cooling conduction plate (42). When the sliding housing (12) slides to the position of the cooling contact plate (10), the cooling contact plate (10) cools the bottom surface of the sliding housing (12) and causes the cooling conduction plate (42) to cool down.

7. The rapid cooling plastic watch case injection molding apparatus according to claim 1, characterized in that: The top of the sliding housing (12) is provided with a movable top cover (8), which is snapped into the top cover mounting cavity opened on the top of the sliding housing (12). The movable top cover (8) is provided with a first injection hole (7), and the top of the injection mold facing the first injection hole (7) is provided with a second injection hole (34). The top of the injection cooling area (28) is provided with an injection needle (5). When the injection mold moves to the injection cooling area, the injection needle (5) passes through the first injection hole (7) and the second injection hole (34) and is inserted into the injection mold for injection. The top of the injection mold is equipped with a second electromagnet (29), and the bottom of the movable top cover (8) is equipped with a third electromagnet (17) corresponding to the second electromagnet (29). When both the second electromagnet (29) and the third electromagnet (17) are energized, they are magnetically attracted together, and the first electromagnet (32) is de-energized. At this time, the upper mold (33) and the lower mold (18) of the injection mold are separated. The second electromagnet (29) and the third electromagnet (17) are both controlled and powered by the control host (2). When the injection mold moves to the unloading area (27), the movable top cover (8) and the upper mold (33) are opened, and the injection-molded product is unloaded.

8. The rapid cooling plastic watch case injection molding apparatus according to claim 7, characterized in that: The unloading area (27) is provided with an unloading cover plate (6) at the top and a fourth electromagnet (15) at the bottom of the unloading cover plate (6). When the injection mold moves to the bottom position of the unloading cover plate (6), the fourth electromagnet (15) is energized and attracts the movable top cover (8) at the top of the injection mold. After the unloading cover plate (6), the movable top cover (8) and the upper mold (33) are taken out, the product is taken out. The fourth electromagnet (15) is controlled and powered by the control host (2).

9. The rapid cooling plastic watch case injection molding apparatus according to claim 1, characterized in that: A viewing window (13) is installed on the side of the device housing (1) away from the driving component. The driving component is a driving cylinder (3). Multiple antenna-type telescopic rods (44) are also provided on the sealing ring (20). The top of the antenna-type telescopic rods (44) is embedded in the top surface of the sliding housing (12).

10. A rapid cooling injection molding process for a plastic watch case, characterized in that, The rapid cooling plastic watch case injection molding apparatus according to any one of claims 1 to 9 includes the following specific steps: S1. Prepare the molten injection material, and use the driving component to drive the sliding shell (12) from the initial area to the injection cooling area (28) and then stop. S2. When the initial area enters the injection cooling area (28), the gas in the sealed cavity will pass through the first one-way air inlet valve and enter the air inlet cavity (45). The gas entering will cause the entire injection mold to float to the top. The excess gas will enter the gas storage mechanism for compression and storage. S3. The injection mold is in a floating state and is located at the top of the sliding shell (12). At this time, the injection head injects the prepared injection material into the injection cavity (30) until the injection is completed. S4. After injection, the solenoid valve opens and discharges the gas in the air inlet chamber (45). At this time, the injection mold is lowered by its own weight and comes into contact with the cooling mechanism to cool the injected material. S5. After cooling is complete, the driving component continues to push the injection mold to the unloading area (27). During the pushing process, the gas in the sealed cavity will enter the air inlet cavity (45). At this time, the injection mold is pushed to the top, and the excess gas enters the gas storage mechanism to continue to be compressed and stored. S6. After reaching the unloading area (27), the first electromagnet (32) is de-energized, and the second electromagnet (29) and the third electromagnet (17) are attracted. At this time, the lower mold (18) is affected by gravity and separates from the upper mold (33). At the same time, the linkage sealing mechanism opens the pressure relief hole (40), and the stored pressure gas passes through the pressure relief hole (40) and ejects the injection-molded product. The unloading cover plate (6), the movable top cover (8) and the upper mold (33) are taken out and the product is removed.

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