Injection molding device for plastic disc production

Abstract

The invention discloses an injection molding device for plastic disc production, and relates to the technical field of injection molding, the injection molding device comprises a platen, a top cylinder is fixed at the top of the platen, a bottom cover is fixed at the bottom of the platen, a double-layer frame is fixed on the platen, and a lower mold is arranged in the double-layer frame; a plugging cover slides on the outer side of the top barrel, an upper mold matched with the lower mold for use is arranged in the plugging cover, a mold closing assembly used for opening and closing the lower mold and the upper mold is arranged in the top barrel, and the top barrel comprises a double-head motor embedded in the top barrel; a material uniformizing assembly used for rotation of the lower mold and the upper mold is arranged in the platen, a jacking assembly used for demolding of a plastic disc in the lower mold is arranged in the bottom cover, and a temperature control assembly matched with the double-layer frame is arranged on the outer side of the platen. On the basis of the conditions of automatic mold closing and jacking demolding, the uniform and compact distribution effect of materials is achieved, and the yield is increased.

Description

Technical Field

[0001] This invention relates to the field of injection molding technology, and in particular to an injection molding apparatus for the production of plastic discs. Background Technology

[0002] Plastic products are made of plastics, which are polymers formed through addition or condensation polymerization. Commonly known as plastics or resins, their composition and shape can be freely changed. They consist of synthetic resins and additives such as fillers, plasticizers, stabilizers, lubricants, and colorants. In the semiconductor field, plastic discs are used to protect electronic components.

[0003] During the injection molding of plastic discs, after the material enters the upper and lower molds, due to the spatial layout of the upper and lower mold channels and the influence of the material's own flow force attenuation, the material is unevenly distributed in the mold cavities of the upper and lower molds and is not compact enough. This directly leads to defects and empty packages in the molded plastic disc preform, increasing the defect rate of the product molding. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the problems existing in the above and / or existing injection molding equipment for the production of plastic discs, the present invention is proposed.

[0006] Therefore, the problem to be solved by this invention is how to achieve a uniform and compact distribution of materials under automatic mold closing and top-pressure demolding conditions, resulting in a low yield rate.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an injection molding device for producing plastic discs, including a table, a top cylinder fixed to the top of the table, a bottom cover fixed to the bottom of the table, a double-layer frame fixed on the table, and a lower mold arranged inside the double-layer frame.

[0008] A sealing cover slides on the outer side of the top cylinder, and an upper mold for use with the lower mold is provided inside the sealing cover. A mold closing assembly for opening and closing operations of the lower mold and the upper mold is provided inside the top cylinder, and a double-headed motor is embedded in the top cylinder.

[0009] The platform is equipped with a material leveling assembly for rotating the lower and upper molds, and includes a lower electric push rod fixed to one output shaft of a dual-head motor via a coupling. The bottom cover is equipped with a lifting assembly for demolding the plastic disc in the lower mold, and includes a turntable that rotates within the bottom cover. The outer side of the platform is equipped with a temperature control assembly that works in conjunction with the double-layer frame.

[0010] As a preferred embodiment of the injection molding device for producing plastic discs according to the present invention, the mold clamping assembly further includes an upper electric push rod fixed to another output shaft of a dual-head motor via a coupling, and an upper locking head is fixed on the piston rod of the upper electric push rod. An upper locking seat that rotates with the top cylinder is provided above the upper locking head, and a threaded rod that rotates with the top cylinder is fixed on the upper locking seat.

[0011] As a preferred embodiment of the injection molding device for producing plastic discs according to the present invention, wherein: a threaded sleeve is threadedly connected to the threaded rod, and a support arm that slides with the top cylinder is fixed on the outside of the threaded sleeve, the support arm is fixed to the sealing cover, and a sealing groove for sealing with the double-layer frame is circumferentially opened at the bottom of the sealing cover.

[0012] As a preferred embodiment of the injection molding device for producing plastic discs according to the present invention, wherein: a material feeding disc that is connected to the upper mold is rotatably disposed inside the sealing cover, and a connecting end is connected to the top of the material feeding disc, and a rotating end is rotatably disposed outside the connecting end, and the connecting end and the rotating end are kept in a state of mutual communication.

[0013] As a preferred embodiment of the injection molding device for producing plastic discs according to the present invention, wherein: the top end of the rotating end is connected to a metering valve, and the top end of the metering valve is connected to a material distribution head connected to an external injection pipeline; the material leveling assembly further includes a drive gear fixed on the lower electric push rod piston rod, and a differential gear rotates inside the platform.

[0014] As a preferred embodiment of the injection molding device for producing plastic discs according to the present invention, wherein: the differential gear is embedded with a sealing element that rotates with the platform, and both the sealing element and the material tray are fitted with ratchet wheels, the ratchet wheels are engaged with pawls, and the outer side of the pawls is fixed with compression springs.

[0015] As a preferred embodiment of the injection molding device for producing plastic discs according to the present invention, the lifting assembly further includes a lower locking head fixed to the bottom of the drive gear, and a lower locking seat fixed to the turntable is provided below the lower locking head. A wave ring is fixed to the inner side of the turntable, and a ball rolls on the wave ring. A lifting rod that slides with the seal is fixed on the ball through a support.

[0016] As a preferred embodiment of the injection molding device for producing plastic discs according to the present invention, a molding cavity is provided above the inner cavity of the lower mold, and a sealing slide cavity is provided at the bottom of the inner cavity of the lower mold. A lifting seat fixed to a lifting rod slides in the sealing slide cavity, and a spring fixed to a sealing element is sleeved on the lifting rod.

[0017] As a preferred embodiment of the injection molding device for producing plastic discs according to the present invention, the temperature control component includes a small integrated heating and cooling machine fixed on the outside of the platform, and the heat transfer port of the small integrated heating and cooling machine is connected to a heat transfer pipe with a one-way valve. The outer end of the heat transfer pipe is connected to a heat supply cover, and a double-layer cavity is reserved in the double-layer frame.

[0018] As a preferred embodiment of the injection molding device for producing plastic discs according to the present invention, wherein: the cold inlet of the small integrated heating and cooling machine is connected to a cold supply pipe with a one-way valve, and the outer end of the cold supply pipe is connected to a cold supply hood; both sides of the double-layer frame are embedded with flow equalization plates that communicate with the heat supply hood and the cold supply hood; and a temperature and humidity sensor is embedded on the outer side of the double-layer frame.

[0019] The beneficial effects of this invention are as follows: The mold-closing assembly achieves automatic mold-closing of multiple lower and upper molds, replacing manual mold-closing operations. This results in higher sealing and fit, preventing mold misalignment and defects in the molded plastic disc. The material distribution assembly uses a linear rotation method to distribute material evenly and compactly into the cavities of multiple lower and upper molds, improving the yield rate of the molded plastic disc. The lifting assembly utilizes the height difference of the wave rings and an adaptive pressing method to automatically demold the molded plastic disc preform, avoiding manual demolding and resulting in preform defects. The temperature control assembly applies heating conditions to the material in the mold cavity during the rotating material distribution process, improving material flowability and preventing stagnation due to flow attenuation within the mold cavity channels. It also applies cooling conditions to the molded plastic disc preform, shortening its molding time and facilitating the lifting and demolding of the plastic disc preform. No external heating or cooling equipment is required, making it more efficient. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. 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.

[0021] Figure 1 This is an initial state diagram of an injection molding device used for the production of plastic discs.

[0022] Figure 2 This is a diagram showing the injection molding process of an injection molding device used for the production of plastic discs.

[0023] Figure 3 This is a partial bottom view of an injection molding machine used for the production of plastic discs.

[0024] Figure 4 This is a side sectional view of the sealing cap, upper mold, and mold closing assembly of an injection molding device used for the production of plastic discs.

[0025] Figure 5 This is an exploded side view of the lower mold and the material leveling assembly of an injection molding device used for the production of plastic discs.

[0026] Figure 6 This is a side sectional view of the lower mold and lifting assembly of an injection molding device used for the production of plastic discs.

[0027] Figure 7 Rear view of the injection molding unit used for producing plastic discs, including the platform, top cylinder, bottom cover, double-layer frame, and temperature control components.

[0028] In the diagram: 1. Platform; 2. Top cylinder; 3. Bottom cover; 4. Double-layer frame; 5. Lower mold; 6. Sealing cap; 7. Upper mold; 81. Dual-head motor; 82. Upper electric push rod; 83. Upper locking stop head; 84. Upper locking stop seat; 85. Threaded rod; 86. Threaded sleeve; 87. Support arm; 91. Lower electric push rod; 92. Drive gear; 93. Differential gear; 94. Seal; 95. Ratchet; 96. Pad; 97. Compression spring; 101. Lower locking stop head; 102. 103. Lower locking seat; 104. Turntable; 105. Wave ring; 106. Ball bearing; 107. Lifting rod; 108. Lifting seat; 119. Small integrated heating and cooling unit; 110. Heat transfer pipe; 111. Heat supply cover; 112. Cold transfer pipe; 113. Cold supply cover; 114. Flow equalization plate; 115. Temperature and humidity sensor; 116. Fabric head; 12. Metering valve; 13. Rotating end; 14. Connecting end; 15. Fabric tray; 16. Spring; 17. Sealing slide cavity. Detailed Implementation

[0029] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0030] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0031] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0032] Example 1, referring to Figures 1 to 7 This is the first embodiment of the present invention. This embodiment provides an injection molding device for producing plastic discs, including a platform 1. The platform 1 is fixed with support legs with casters on all four sides, which facilitates the movement of the device to a predetermined injection position and improves its flexibility. A top cylinder 2 is fixed to the top of the platform 1, and a bottom cover 3 is fixed to the bottom of the platform 1. A double-layer frame 4 is fixed on the platform 1, and a lower mold 5 is arranged inside the double-layer frame 4. A sealing cover 6 slides on the outside of the top cylinder 2, and an upper mold 7 that is used in conjunction with the lower mold 5 is arranged inside the sealing cover 6. Positioning pins are fixed around the bottom of the lower mold 5, and pin heads are fixed around the outside of the upper mold 7. During the closing and rotation of the lower mold 5 and the upper mold 7, they play a role in precise docking and stability, so that the lower mold 5 and the upper mold 7 fit tightly together to form a whole.

[0033] Specifically, the top cylinder 2 is equipped with a mold closing assembly for opening and closing operations of the lower mold 5 and the upper mold 7, and includes a double-head motor 81 embedded in the top cylinder 2, and an upper electric push rod 82 fixed to another output shaft of the double-head motor 81 via a coupling. An upper locking stop head 83 is fixed on the piston rod of the upper electric push rod 82, and an upper locking stop seat 84 that rotates with the top cylinder 2 is provided above the upper locking stop head 83. A threaded rod 85 that rotates with the top cylinder 2 is fixed on the upper locking stop seat 84. First, the upper electric push rod 82 adjusts the engagement stroke of the upper locking stop head 83 and the upper locking stop seat 84, and then the double-head motor 81 drives the threaded rod 85 on the upper locking stop seat 84 to rotate in the forward direction through the upper locking stop head 83 that is engaged.

[0034] Specifically, a threaded sleeve 86 is threadedly connected to the threaded rod 85, and a support arm 87 that slides with the top cylinder 2 is fixed on the outside of the threaded sleeve 86. The support arm 87 is fixed to the sealing cover 6. The threaded rod 85 drives the three support arms 87 on the threaded sleeve 86 to move down synchronously. The three support arms 87 drive the three sets of upper molds 7 inside the sealing cover 6 to move down and lock into the three sets of lower molds 5 inside the double-layer frame 4. The three sets of upper molds 7 and lower molds 5 complete the mold closing. The bottom of the sealing cover 6 has a sealing groove that seals with the double-layer frame 4. The sealing groove on the sealing cover 6 closes with the double-layer frame 4 to form a sealed space, creating a dustproof environment, and also providing convenience for subsequent injection molding and cooling demolding.

[0035] The sealing cover 6 has a rotating material distribution plate 16 that is connected to the upper mold 7. The top of the material distribution plate 16 is connected to a connecting end 15. The outside of the connecting end 15 is a rotating end 14. The connecting end 15 and the rotating end 14 are in a state of mutual communication, which makes it easy for the material to reach the material distribution plate 16 through the rotating end 14 and the connecting end 15. At the same time, the connecting end 15 can rotate within the rotating end 14 to achieve the rotating material distribution effect of the material distribution plate 16. The top of the rotating end 14 is connected to a metering valve 13, and the top of the metering valve 13 is connected to a material distribution head 12 that is connected to an external injection pipeline. The material distribution head 12 and the metering valve 13 are connected by a threaded connection. Depending on the connection method of the external injection pipeline, it is easy to replace the material distribution head 12 of different specifications.

[0036] The material in the external injection pipeline is metered by the metering valves 13 on the three feeding heads 12. The three metered portions of material then pass through the three sets of rotating ends 14 and connecting ends 15 to the three sets of feeding discs 16. The metered material in the three sets of feeding discs 16 then passes through the three sets of upper molds 7 to the three sets of lower molds 5 after mold closing. This achieves a zoned metered feeding effect for the material in the mold cavities of the three sets of upper molds 7 and lower molds 5, avoiding turbulence and stagnation caused by uniform feeding, facilitating the flow of material in the mold cavity, and improving the rationality and uniformity of material feeding.

[0037] Example 2, refer to Figures 1 to 7 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0038] Specifically, the platform 1 is equipped with a material leveling assembly for rotating the lower mold 5 and the upper mold 7, and includes a lower electric push rod 91 fixed to one output shaft of the dual-head motor 81 via a coupling. The material leveling assembly also includes a drive gear 92 fixed to the piston rod of the lower electric push rod 91, and a differential gear 93 rotates within the platform 1. The lower electric push rod 91 first adjusts the meshing stroke of the drive gear 92 and the three sets of differential gears 93, and then the dual-head motor 81 drives the three sets of differential gears 93 to rotate at different speeds through the meshed drive gear 92.

[0039] Specifically, the differential gear 93 is embedded with a seal 94 that rotates with the platform 1. The three sets of differential gears 93 drive the three sets of lower molds 5 and upper molds 7 to rotate synchronously through the three seals 94. The linearly rotating three sets of lower molds 5 and upper molds 7 generate centrifugal force on the material distributed in the partitioned areas inside. Under the action of centrifugal force, the material inside is forced to be evenly distributed in the mold cavity space of the three sets of lower molds 5 and upper molds 7, so that the material is more evenly and compactly distributed in the mold cavity, avoiding defects and empty packages, and improving the molding yield of plastic discs in the mold cavity.

[0040] Furthermore, ratchet wheels 95 are fitted on both the seal 94 and the material distribution plate 16. A pawl 96 is engaged on the ratchet wheel 95, and a compression spring 97 is fixed to the outside of the pawl 96. The three sets of lower molds 5 drive the ratchet wheels 95 on them through the three seals 94, and the three sets of upper molds 7 drive the ratchet wheels 95 on them through the three material distribution plates 16. The three sets of ratchet wheels 95 drive the pawl 96 to perform a skipping action on them, and the skipping action of the pawl 96 applies frequency compression to the compression spring 97. This provides a reverse restriction measure for the three sets of lower molds 5 and upper molds 7 in differential rotation, thereby improving the distribution and flow stability of the material in the mold cavities of the lower molds 5 and upper molds 7.

[0041] Example 3, referring to Figures 1 to 7 This is the third embodiment of the present invention, which is based on the first two embodiments.

[0042] Specifically, the bottom cover 3 is equipped with a lifting component for demolding the plastic disc in the lower mold 5, including a turntable 103 rotating inside the bottom cover 3, and a lower locking head 101 fixed to the bottom of the drive gear 92. A lower locking seat 102 fixed to the turntable 103 is provided below the lower locking head 101. The lower electric push rod 91 adjusts the engagement stroke between the lower locking head 101 and the lower locking seat 102 through the drive gear 92. A wave ring 104 is fixed on the inner side of the turntable 103. The protruding end and the concave end of the wave ring 104 are staggered and there is a height difference between the protruding end and the concave end to meet the lifting and demolding requirements of the subsequent molded plastic disc blank. The dual-head motor 81 drives the turntable 103 and the wave ring 104 on the lower locking seat 102 to rotate synchronously by engaging the lower locking head 101.

[0043] Furthermore, a ball bearing 105 rolls on the wave ring 104, and a lifting rod 106 that slides with the sealing element 94 is fixed on the ball bearing 105 by a support. A forming cavity is opened above the inner cavity of the lower mold 5, and a sealing slide cavity 18 is opened at the bottom of the inner cavity of the lower mold 5. A lifting seat 107 that is fixed with the lifting rod 106 slides in the sealing slide cavity 18. The lifting seat 107 extends to the bottom of the forming cavity and is flush with the bottom of the forming cavity to seal it. The lifting seat 107 plays a sealing role between the sealing slide cavity 18 and the forming cavity to prevent material leakage. A spring 17 that is fixed with the sealing element 94 is sleeved on the lifting rod 106.

[0044] The rotating wave ring 104 drives three sets of balls 105 to roll on its raised and recessed ends. Due to the height difference between the raised and recessed ends on the wave ring 104, when the balls 105 roll to the raised end, they force the lifting rod 106 on it to drive the lifting seat 107 to slide upward in the sealed sliding cavity 18 of the lower mold 5 and compress the spring 17. The upwardly sliding lifting seat 107 then ejects the plastic disc blank formed in the forming cavity of the lower mold 5 and demolds it, achieving a highly efficient demolding effect for the plastic disc blanks formed in the three sets of lower molds 5, replacing manual demolding, and avoiding uneven force on the molded plastic disc blanks during demolding, which could cause defects.

[0045] Example 4, refer to Figures 1 to 7 This is the third embodiment of the present invention, which is based on the first three embodiments.

[0046] Specifically, the outer side of the platform 1 is equipped with a temperature control component that works with the double-layer frame 4, including a small integrated heating and cooling unit 111 fixed on the outer side of the platform 1. The heat transfer port of the small integrated heating and cooling unit 111 is connected to a heat transfer pipe 112 with a one-way valve. The outer end of the heat transfer pipe 112 is connected to a heat delivery cover 113. The double-layer frame 4 has a pre-reserved interlayer cavity to provide flow space for the heat source and the cold source.

[0047] In the fabric feeding area, the small integrated heating and cooling machine 111 is turned on and generates a heat source. The generated heat source is supplied into the heat supply cover 113 through the heat transfer pipe 112, and then the heat is evenly distributed by a set of flow equalization plates 116 before reaching the interlayer cavity in the sealed space. This heats the three sets of lower molds 5 and upper molds 7 that are in the rotating fabric feeding state, increasing the fluidity of the material inside. This improves the fluidity of the material inside the mold cavities of the three sets of lower molds 5 and upper molds 7, preventing the material from becoming too viscous due to temperature changes and resulting in low fluidity, thus facilitating the effective distribution of the material within the mold cavity.

[0048] The cooling port of the small integrated cooling and heating unit 111 is connected to a cooling pipe 114 with a one-way valve, and the outer end of the cooling pipe 114 is connected to a cooling cover 115. Both sides of the double-layer frame 4 are equipped with flow equalization plates 116 that are connected to the heating cover 113 and the cooling cover 115. Temperature and humidity sensors 117 are embedded on the outer side of the double-layer frame 4. The temperature and humidity sensors 117 monitor the heat temperature and humidity in the interlayer cavity in real time to ensure that the optimal temperature and humidity conditions are reached.

[0049] After the plastic disc preform is formed, the small integrated heating and cooling machine 111 is switched to generate a cold source. The generated cold source is supplied into the cooling hood 115 through the cooling pipe 114, and then the cold source is evenly distributed by another set of flow equalization plates 116 before reaching the interlayer cavity in the sealed space. This cools the three sets of lower molds 5 and upper molds 7 that have completed the molding process, shortens the molding time, improves the molding efficiency of the plastic disc preform in the mold cavities of the three sets of lower molds 5 and upper molds 7, and prepares for rapid demolding.

[0050] The working principle is as follows: First, the upper electric push rod 82 is opened and the upper locking head 83 is moved upward and locked into the upper locking seat 84. Then, the double-head motor 81 is opened and, through the locked upper locking head 83, drives the threaded rod 85 on the upper locking seat 84 to rotate forward. The threaded rod 85 drives the three support arms 87 on the threaded sleeve 86 to move downward synchronously. The three support arms 87 drive the three sets of upper molds 7 in the sealing cover 6 to move downward and lock into the three sets of lower molds 5 in the double-layer frame 4. Then, the sealing cover 6 seals the double-layer frame 4, forming a sealed space. After the three sets of upper molds 7 and lower molds 5 complete the mold closing, the double-head motor 81 is first stopped, and then the upper electric push rod 82 is closed and drives the upper locking head 83 to move downward, disengaging from the upper locking seat 84 to the initial position.

[0051] Next, the material in the external injection pipeline is metered by the metering valves 13 on the three feeding heads 12. The three metered portions of material pass through the three sets of rotating ends 14 and connecting ends 15 to the three sets of feeding discs 16. The metered material in the three sets of feeding discs 16 then passes through the three sets of upper molds 7 to the three sets of lower molds 5 after mold closing. First, the lower electric push rod 91 is controlled to open and drive the drive gear 92 to move down and engage with the meshing part of the three sets of differential gears 93. At this time, the dual-head motor 81 is controlled to open again and drive the seals 94 on the three sets of differential gears 93 to rotate differentially through the meshing drive gears 92. The three seals 94 drive the three sets of lower molds 5 and upper molds 7 to rotate synchronously.

[0052] At the same time, the three sets of lower molds 5 drive the ratchet 95 on them through the three seals 94, and the three sets of upper molds 7 drive the ratchet 95 on them through the three sets of material distribution discs 16 to rotate. The three sets of ratchet 95 drive the pawl 96 to perform a skipping action. While the pawl 96 performing the skipping action squeezes the compression spring 97 at a frequency, the linearly rotating three sets of lower molds 5 and upper molds 7 generate centrifugal force on the material distributed in the internal sections. Under the action of centrifugal force, the material is forced to be evenly distributed in the mold cavity space of the three sets of lower molds 5 and upper molds 7. After the material is evenly distributed, the dual-head motor 81 is first controlled to pause, and then the lower electric push rod 91 is controlled to close and drive the drive gear 92 to move upward, disengaging from the meshing part of the three sets of differential gears 93 to the initial position.

[0053] During this period, the small integrated heating and cooling machine 111 is turned on in advance to generate a heat source. The generated heat source is supplied into the heat supply cover 113 through the heat transfer pipe 112. After being evenly distributed by a set of flow equalization plates 116, it reaches the interlayer cavity in the sealed space to heat the three sets of lower molds 5 and upper molds 7 in the rotating material distribution state, increasing the fluidity of the material inside. The temperature and humidity sensor 117 monitors the heat temperature in the interlayer cavity in real time until the material in the mold cavities of the three sets of lower molds 5 and upper molds 7 is injected to form three plastic disc preforms.

[0054] After the plastic disc preform is formed, the small integrated heating and cooling machine 111 is switched to generate a cold source. The generated cold source is supplied into the cooling hood 115 through the cooling pipe 114, and then the cold source is evenly distributed by another set of flow equalization plates 116 before reaching the interlayer cavity in the sealed space. The three sets of lower molds 5 and upper molds 7 that have completed the molding process are cooled. The temperature and humidity sensor 117 monitors the heat and temperature in the interlayer cavity in real time until the three plastic disc preforms formed in the mold cavities of the three sets of lower molds 5 and upper molds 7 are cooled.

[0055] Then, the upper electric push rod 82 and the double-headed motor 81 are opened in succession, and the sealing cover 6 is moved up and disengaged from the double-layer frame 4. After the three sets of upper molds 7 are disengaged from the three sets of lower molds 5 to the initial position, the lower electric push rod 91 is controlled to drive the drive gear 92 to move down again and disengage from the meshing part of the three sets of differential gears 93. The drive gear 92, which moves down again, drives the lower locking head 101 to lock into the lower locking seat 102. Then, the double-headed motor 81 is opened again and the lower locking head 101 is locked into place, causing the turntable 103 and the wave ring 104 on the lower locking seat 102 to rotate synchronously.

[0056] The rotating wave ring 104 drives three sets of balls 105 to roll on its raised and recessed ends. Due to the height difference between the raised and recessed ends on the wave ring 104, when the balls 105 roll to the raised end, they force the lifting rod 106 on it to drive the lifting seat 107 to slide upward in the sealed sliding cavity 18 of the lower mold 5 and compress the spring 17. The upward lifting seat 107 then pushes out the plastic disc blank formed in the forming cavity of the lower mold 5 and demolds it. This process is repeated to complete the demolding of all the plastic disc blanks formed in the three sets of lower molds 5.

[0057] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An injection molding device for producing plastic discs, characterized in that: Includes a table (1), a top cylinder (2) is fixed to the top of the table (1), and a bottom cover (3) is fixed to the bottom of the table (1). A double-layer frame (4) is fixed on the table (1), and a lower mold (5) is provided inside the double-layer frame (4). A sealing cover (6) is slidably provided on the outside of the top cylinder (2), and an upper mold (7) is provided inside the sealing cover (6) for use with the lower mold (5). A mold closing assembly for opening and closing operations of the lower mold (5) and the upper mold (7) is provided inside the top cylinder (2), and a double-headed motor (81) is embedded in the top cylinder (2). The platform (1) is provided with a material leveling component for rotating the lower mold (5) and the upper mold (7), and includes a lower electric push rod (91) fixed to one output shaft of a double-headed motor (81) by a coupling. The bottom cover (3) is provided with a lifting component for demolding the plastic disc in the lower mold (5), and includes a turntable (103) rotating in the bottom cover (3). The outside of the platform (1) is provided with a temperature control component that matches the double-layer frame (4).

2. The injection molding apparatus for producing plastic discs as described in claim 1, characterized in that: The mold closing assembly also includes an upper electric push rod (82) fixed to another output shaft of the double-head motor (81) via a coupling, and an upper locking head (83) is fixed on the piston rod of the upper electric push rod (82). An upper locking seat (84) that rotates with the top cylinder (2) is provided above the upper locking head (83), and a threaded rod (85) that rotates with the top cylinder (2) is fixed on the upper locking seat (84).

3. The injection molding apparatus for producing plastic discs as described in claim 2, characterized in that: The threaded rod (85) is threaded with a threaded sleeve (86), and a support arm (87) that slides with the top cylinder (2) is fixed on the outside of the threaded sleeve (86). The support arm (87) is fixed with the sealing cover (6), and the bottom of the sealing cover (6) is provided with a sealing groove that seals with the double-layer frame (4).

4. The injection molding apparatus for producing plastic discs as described in claim 3, characterized in that: The sealing cover (6) has a cloth disc (16) that rotates inside and communicates with the upper mold (7), and the top of the cloth disc (16) is connected to a connecting end (15). The outer side of the connecting end (15) has a rotating end (14), and the connecting end (15) and the rotating end (14) are in a state of mutual communication.

5. The injection molding apparatus for producing plastic discs as described in claim 4, characterized in that: The top of the rotating end (14) is connected to a metering valve (13), and the top of the metering valve (13) is connected to a fabric head (12) connected to an external injection pipeline. The material leveling assembly also includes a drive gear (92) fixed on the piston rod of the lower electric push rod (91), and a differential gear (93) rotates inside the platform (1).

6. The injection molding apparatus for producing plastic discs as described in claim 5, characterized in that: The differential gear (93) is embedded with a seal (94) that rotates with the platform (1), and both the seal (94) and the fabric disc (16) are fitted with ratchet (95), the ratchet (95) is engaged with a pawl (96), and a compression spring (97) is fixed on the outside of the pawl (96).

7. The injection molding apparatus for producing plastic discs as described in claim 6, characterized in that: The lifting assembly also includes a lower locking head (101) fixed to the bottom of the drive gear (92), and a lower locking seat (102) fixed to the turntable (103) is provided below the lower locking head (101). A wave ring (104) is fixed on the inner side of the turntable (103), and a ball (105) rolls on the wave ring (104). A lifting rod (106) that slides with the seal (94) is fixed on the ball (105) by a support.

8. The injection molding apparatus for producing plastic discs as described in claim 7, characterized in that: The lower mold (5) has a forming cavity above its inner cavity and a sealing slide cavity (18) at the bottom of its inner cavity. A lifting seat (107) fixed to the lifting rod (106) slides in the sealing slide cavity (18), and a spring (17) fixed to the sealing element (94) is sleeved on the lifting rod (106).

9. The injection molding apparatus for producing plastic discs as described in claim 8, characterized in that: The temperature control component includes a small integrated heating and cooling unit (111) fixed on the outside of the platform (1), and the heat transfer port of the small integrated heating and cooling unit (111) is connected to a heat transfer pipe (112) with a one-way valve. The outer end of the heat transfer pipe (112) is connected to a heat supply cover (113), and a double-layer cavity is reserved in the double-layer frame (4).

10. The injection molding apparatus for producing plastic discs as described in claim 9, characterized in that: The small integrated cooling and heating unit (111) has a cooling inlet connected to a cooling pipe (114) with a one-way valve, and the outer end of the cooling pipe (114) is connected to a cooling cover (115). Both sides of the double-layer frame (4) are fitted with flow equalization plates (116) that are connected to the heating cover (113) and the cooling cover (115), and the outer side of the double-layer frame (4) is fitted with a temperature and humidity sensor (117).

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