Liquid silica gel forming device

Abstract

The utility model provides a liquid silica gel forming device, and belongs to the technical field of silica gel forming equipment. The problem that the production efficiency is affected due to the fact that silica gel in a runner is blocked by high temperature when existing liquid silica gel is formed is solved. The liquid silica gel forming device comprises a frame body, a gel storage tank, a mold and a heating table used for heating the mold, the mold comprises an upper mold body and a lower mold body, the upper mold body and the lower mold body are assembled to form a cavity, and a runner communicated with the cavity is formed in the upper mold body; the mold further comprises a lifting mechanism, the lifting mechanism is used for driving the heating table to lift up and down, the glue storage tank is located above the upper mold and used for injecting glue into the cavity through the runner under normal pressure, the lower mold is located below the upper mold and located on the heating table, and a heat insulation structure used for conducting heat insulation on the runner is arranged in the upper mold. The glue injection structure is simple, the cost is lower, the runner is prevented from being blocked during molding, the production operation is simple, and the efficiency is higher.

Description

Technical Field

[0001] This utility model belongs to the technical field of silicone molding equipment, and relates to a liquid silicone molding device. Background Technology

[0002] Silicone products have advantages such as high temperature resistance, easy cleaning, long lifespan, and softness and comfort, making them increasingly widely used in daily life.

[0003] Currently, silicone products are mainly divided into solid silicone molding and liquid silicone molding based on different molding processes. Solid silicone molding involves placing the mixed silicone raw material into a mold and then curing it through heating and pressure. Liquid silicone molding, on the other hand, involves injecting the mixture into a mold using an injection molding machine and then heating and curing it. Although solid silicone molding is less expensive, liquid silicone molding offers advantages that solid molding cannot replace due to its better fluidity, greater plasticity, and richer details in the finished product.

[0004] For example, a liquid silicone injection molding machine disclosed in Chinese patent application (application number: 2023321239997.7) includes a frame, a fixed frame, and an injection assembly. A feeding device is provided on the side of the injection assembly near the upper mold. The feeding device is used to inject liquid silicone into the injection assembly and includes a hopper and a pusher tube, with a feeding screw installed inside the pusher tube. Although the above structure can achieve liquid silicone injection and heating molding, it is complex and costly, making it unaffordable for many small and micro-sized enterprises. Furthermore, after the mold is closed and liquid silicone is injected into the cavity, it needs to be heated to solidify. Because the mold has good thermal conductivity, heating the silicone in the cavity also causes the upper mold temperature to rise, solidifying the liquid silicone in the silicone runner channels and clogging the channels. After mold opening, the silicone runner channels and channels need to be cleaned, increasing the operator's steps and affecting production efficiency. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a liquid silicone molding device. The technical problem this invention aims to solve is: how to improve the production efficiency of liquid silicone.

[0006] The objective of this utility model can be achieved through the following technical solution: A liquid silicone molding device, comprising a frame, a storage tank, a mold, and a heating platform for heating the mold, wherein the mold comprises an upper mold and a lower mold, the upper mold and the lower mold being closed to form a cavity, and the upper mold having a flow channel communicating with the cavity; characterized in that it further comprises a lifting mechanism, the lifting mechanism being used to drive the heating platform to move up and down, the storage tank being located above the upper mold and used to inject silicone into the cavity through the flow channel at normal pressure, the lower mold being located below the upper mold and on the heating platform, and the upper mold having a heat insulation structure for heat insulation of the flow channel.

[0007] This invention adopts a vertical structure, with the glue storage tank, upper mold, lower mold, and heating platform arranged from top to bottom. In use, the heating platform first rises, moving the lower mold upwards to close it with the upper mold. Then, the glue storage tank naturally injects glue into the cavity under gravity. After injection, the heating platform heats and solidifies the liquid silicone in the cavity. Once solidification is complete, the heating platform lowers and the mold opens, allowing the molded silicone product to be removed. Because the upper mold has a heat insulation mechanism, the liquid silicone in the flow channel is prevented from solidifying when the heating platform heats the cavity, ensuring unobstructed flow. After removing the molded silicone product, the cavities of both molds can be easily cleaned for repeated production, simplifying operation and increasing production efficiency. Furthermore, since this invention uses atmospheric pressure injection, it eliminates the need for a glue injection machine and reduces the sealing requirements when the upper and lower molds are closed, thus lowering production costs.

[0008] In the above-mentioned liquid silicone molding device, a movable platform is provided below the heating platform. The lifting mechanism includes a lifting hydraulic cylinder and several guide columns. The lifting hydraulic cylinder is vertically arranged on the movable platform and the piston rod of the lifting hydraulic cylinder is fixedly connected to the heating platform. The guide columns are vertically fixed on the bottom surface of the heating platform. The guide columns are arranged at intervals around the lifting hydraulic cylinder and slide in cooperation with the movable platform.

[0009] In the above-mentioned liquid silicone molding device, the frame is provided with a horizontally arranged slide rail and a translation drive mechanism for driving the moving platform to move back and forth along the slide rail. The bottom of the moving platform is provided with a bracket, and the bracket is provided with a number of pulleys that slide in cooperation with the slide rail.

[0010] In the aforementioned liquid silicone molding apparatus, the upper mold includes a runner plate assembly and a mold core located below the runner plate assembly. The runner is located within the runner plate assembly. The heat insulation structure includes a heat insulation plate disposed between the runner plate assembly and the mold core, and a needle valve nozzle disposed at the runner outlet. The needle valve nozzle is used to open and close the runner. Thus, the heat insulation plate can significantly reduce heat conduction between the mold core and the runner plate assembly, thereby lowering the runner temperature. Furthermore, the needle valve nozzle can close the runner after injection, forming a heat insulation barrier between the mold core and the runner, further reducing the temperature within the runner.

[0011] In the aforementioned liquid silicone molding apparatus, the flow channel includes an injection port, a flow channel groove communicating with the injection port, and several injection channels connecting the flow channel groove and the mold cavity. Each injection channel is equipped with a needle valve nozzle, which includes a tube body, a valve needle inserted into the tube body, and a piston connected to the valve needle. Both ends of the tube body are respectively connected to the flow channel groove and the mold cavity. The flow channel plate assembly has several limiting holes corresponding to the needle valve nozzles. The piston is slidably disposed within the limiting holes, dividing the limiting holes into upper and lower chambers. Each chamber is connected to a pneumatic pipeline. Air intake through the two chambers of the limiting holes drives the piston and valve needle to move up and down, opening or closing the injection channel.

[0012] The aforementioned liquid silicone molding apparatus also includes a cooling system. This cooling system comprises a cooling channel and a pump for supplying coolant to the cooling channel. The tube body includes an outer tube and an inner tube, with the inner tube inserted inside the outer tube. Both ends of the inner tube are fixedly connected to the outer tube, and a gap exists between the middle of the inner tube and the outer tube, forming a heat insulation cavity. The cooling channel communicates with the heat insulation cavity. In this way, the coolant can enter the heat insulation cavity and cool the flow channels within the inner tube.

[0013] In the aforementioned liquid silicone molding apparatus, the cooling system further includes a temperature sensor and a controller for controlling the delivery pump. The temperature sensor is communicatively connected to the controller and is used to detect the temperature at the needle valve nozzle. The sensor can detect the temperature near the flow channel to adjust the flow rate of the coolant, thus preventing both excessively low upper mold temperature from affecting the curing of the liquid silicone in the cavity and preventing the liquid silicone in the flow channel from curing.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] 1. This utility model adopts a vertical structure, with the glue storage tank located above the upper mold and the glue is injected into the cavity after the mold is closed by gravity and normal pressure, which simplifies the glue injection structure.

[0016] 2. This utility model has a heat insulation structure in the upper mold, which prevents the liquid silicone in the upper mold channel from being too hot and solidifying when heating the liquid silicone in the cavity, thus avoiding blockage of the channel, making the production process simpler and smoother, and increasing production efficiency.

[0017] 3. The housing of the needle valve nozzle adopts a double-layer structure design, and coolant is introduced into the heat insulation cavity between the inner tube and the outer tube to cool the flow channel and further prevent the temperature inside the flow channel from getting too high. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the mold structure of this utility model;

[0020] Figure 3 This is a cross-sectional view of the mold of this utility model;

[0021] Figure 4 yes Figure 3 A magnified view of part A in the middle.

[0022] In the diagram, 1 is the frame; 11 is the mounting bracket; 12 is the slide rail; 2 is the glue storage tank; 3 is the mold; 3a is the cavity; 31 is the upper mold; 311 is the pressure plate; 312 is the nozzle limiting plate; 312a is the limiting hole; 313 is the runner plate; 314 is the heat insulation plate; 315 is the mold core; 32 is the lower mold; 41 is the heating table; 42 is the lifting hydraulic cylinder; 43 is the guide pillar; 5 is the control console; 61 is the moving table; 62 is the telescopic hydraulic cylinder; 7 is the needle valve nozzle; 71 is the outer tube; 72 is the inner tube; 7a is the heat insulation cavity; 73 is the valve needle; 74 is the piston; 81 is the delivery pump; 82 is the temperature sensor; 91 is the glue inlet; 92 is the runner groove; 93 is the glue inlet channel. Detailed Implementation

[0023] The following are specific embodiments of the present invention, described in conjunction with the accompanying drawings, to further illustrate the technical solution of the present invention. However, the present invention is not limited to these embodiments. A liquid silicone molding apparatus, such as... Figure 1 , Figure 2 As shown, the device includes a frame 1, a glue storage tank 2, a mold 3, a heating table 41, and a control console 5. The frame 1 includes a mounting bracket 11 located at the top. The glue storage tank 2 is fixed to the upper surface of the mounting bracket 11. The heating table 41 is located below the mounting bracket 11 and has a certain distance from it. The mold 3 is disposed between the mounting bracket 11 and the heating table 41. The mold 3 includes an upper mold 31 and a lower mold 32. When the upper mold 31 and the lower mold 32 are closed, they can form a cavity 3a for silicone molding. The upper mold 31 is fixed to the lower surface of the mounting bracket 11, and the lower mold 32 is fixed on the heating table 41 and faces the upper mold 31. A lifting mechanism is provided below the heating table 41. The lifting mechanism can drive the heating table 41 to move up and down, so that the lower mold 32 and the upper mold 31 can be closed or opened. The control console 5 is located on one side of the frame 1 and is used to control the operation of this device.

[0024] Specifically, such as Figure 1As shown, an electric heating element is installed inside the heating platform 41 for heating the lower mold 32. A movable platform 61 is also installed below the heating platform 41. Two spaced slide rails 12 are installed at the bottom of the frame 1, with the slide rails 12 arranged horizontally. A support is installed at the bottom of the movable platform 61, and four pulleys are installed at the bottom of the support to slide in cooperation with the two slide rails 12. A translation drive mechanism is also installed on the frame 1 to drive the movable platform 61 to move back and forth along the slide rails 12. In this embodiment, the translation drive mechanism is a telescopic hydraulic cylinder 62. Of course, the translation drive mechanism can also be a drive motor with gear and rack transmission. The lifting mechanism consists of a lifting hydraulic cylinder 42 and four guide columns 43. The lifting hydraulic cylinder 42 is vertically installed on the movable platform 61, and the piston 74 rod of the lifting hydraulic cylinder 42 is fixedly connected to the bottom of the heating platform 41. The four guide columns 43 are vertically fixed to the bottom of the heating platform 41 and are slidably connected to the movable platform 61. The four guide columns 43 surround the lifting hydraulic cylinder 42 and are spaced apart to ensure the stability of the heating platform 41 when it is raised or lowered. Through the cooperation of the lifting mechanism and the translation drive mechanism, the heating table 41 can move the lower mold 32 outside the frame 1, and can also move the lower mold 32 inside the frame 1 to close with the upper mold 31.

[0025] like Figure 3 , Figure 4 As shown, in this embodiment, the upper mold 31 includes a runner plate assembly and a mold core 315 located below the runner plate assembly. The runner plate assembly contains runners that communicate with the glue storage tank 2 and the cavity 3a. A heat insulation structure is provided between the runner plate assembly and the mold core 315. Specifically, the heat insulation structure includes a heat insulation plate 314 and a needle valve nozzle 7. The heat insulation plate 314 is located between the runner plate assembly and the mold core 315, and the needle valve nozzle 7 is located at the outlet of the runner and can open or close the runner. In this embodiment, the runner includes a glue inlet 91, a runner groove 92 communicating with the glue injection port, and several glue injection channels 93 communicating with the runner groove 92 and the cavity 3a. Each glue injection channel 93 is provided with the aforementioned needle valve nozzle 7. The needle valve nozzle 7 includes a tube body, a valve needle 73, and a piston 74. The tube body is inserted into the mold core 315, and both ends of the tube body are connected to the runner groove 92 and the cavity 3a, respectively. The valve needle 73 is inserted into the tube body, and the piston 74 is fixed to one end of the valve needle 73. The runner plate assembly is provided with several limiting holes 312a corresponding to the needle valve nozzle 7. The piston 74 is slidably disposed in the limiting holes 312a and divides the limiting holes 312a into upper and lower chambers. Each chamber is connected to a pneumatic pipeline. By introducing air into the upper and lower chambers through the pneumatic pipeline, the piston 74 and the valve needle 73 can be driven to move up and down, so that the valve needle 73 opens or closes the tube body.

[0026] Furthermore, such as Figure 1 , Figure 4As shown, this embodiment also includes a cooling system, which includes a cooling channel and a delivery pump 81. The delivery pump 81 is fixed to the top of the connecting plate and connected to the cooling channel for delivering coolant to the cooling channel. The pipe body adopts a double-layer structure, including an outer pipe body 71 and an inner pipe body 72. The inner pipe body 72 is inserted into the outer pipe body 71, and the two ends of the inner pipe body 72 are fixed to the two ends of the outer pipe body 71 respectively. There is a certain gap between the middle of the inner pipe body 72 and the outer pipe body 71, forming an annular heat insulation cavity 7a. The cooling channel is connected to the heat insulation cavity 7a and forms a loop, so that the coolant can cool the flow channel in the inner pipe body 72. Furthermore, the cooling system also includes a temperature sensor 82 and a controller. The temperature sensor 82 is inserted into one side of the mold core 315 and is connected in communication with the controller. The end of the temperature sensor 82 is adjacent to the tube body, enabling it to monitor the temperature at the needle valve nozzle 7. The controller is located in the control console 5 and is used to control the output pump, so that the controller can adjust the flow rate of the coolant according to the temperature at the needle valve nozzle 7 to ensure that the temperature in the flow channel is maintained within a suitable range.

[0027] Furthermore, such as Figure 3 As shown, in this embodiment, the flow channel plate assembly includes a pressure plate 311, a nozzle limiting plate 312, and a flow channel plate 313 that are sequentially attached and fixed. The glue inlet 91 is located on the top of the pressure plate 311, the limiting hole 312a is located on the nozzle limiting plate 312 and is closed by the pressure plate 311, and the flow channel groove 92 is disposed on the flow channel plate 313. The pressure plate 311, the nozzle limiting plate 312, and the flow channel plate 313 are fixed together by bolts, which facilitates later maintenance and management.

[0028] The working principle of this utility model is as follows: The heating platform 41 moves into the frame 1 and moves upward through the lifting mechanism, so that the lower mold 32 on the heating platform 41 and the upper mold 31 above it are closed. After the mold is closed, the needle valve nozzle 7 opens the flow channel, so that the liquid silicone in the storage tank 2 flows into the cavity 3a under the action of gravity. After the cavity 3a is full, the needle valve nozzle 7 closes the flow channel, and the heating platform 41 adds and solidifies the liquid silicone in the cavity 3a. Meanwhile, the delivery pump 81 delivers coolant to the heat insulation cavity 7a of the needle valve nozzle 7 according to the feedback of the temperature sensor 82, so as to keep it within a certain temperature range. This ensures that the liquid silicone in the cavity 3a can solidify, while preventing the liquid silicone in the flow channel from solidifying. After the silicone in the cavity 3a solidifies, the heating platform 41 stops heating and moves downward, so that the lower mold 32 and the upper mold 31 are separated. After it descends to the bottom, the heating platform 41 then moves the lower mold 32 out of the frame 1, so that the operator can take out the molded silicone product and clean the cavity 3a.

[0029] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0030] Although this document frequently uses terms such as frame 1, glue storage tank 2, mold 3, heating table 41, control console 5, needle valve nozzle 7, delivery pump 81, and temperature sensor 82, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A liquid silicone molding apparatus, comprising a frame (1), a storage tank (2), a mold (3), and a heating table (41) for heating the mold (3), wherein the mold (3) comprises an upper mold (31) and a lower mold (32), the upper mold (31) and the lower mold (32) being closed to form a cavity (3a), and the upper mold (31) having a flow channel communicating with the cavity (3a); characterized in that, It also includes a lifting mechanism, which is used to drive the heating table (41) to move up and down. The glue storage tank (2) is located above the upper mold (31) and is used to inject glue into the cavity (3a) through the flow channel at normal pressure. The lower mold (32) is located below the upper mold (31) and on the heating table (41). The upper mold (31) is provided with a heat insulation structure for heat insulation of the flow channel.

2. The liquid silicone molding apparatus according to claim 1, characterized in that, A movable platform (61) is provided below the heating platform (41). The lifting mechanism includes a lifting hydraulic cylinder (42) and several guide columns (43). The lifting hydraulic cylinder (42) is vertically arranged on the movable platform (61) and the piston (74) rod of the lifting hydraulic cylinder (42) is fixedly connected to the heating platform (41). The guide columns (43) are vertically fixed on the bottom surface of the heating platform (41). The guide columns (43) are spaced around the lifting hydraulic cylinder (42) and slide in cooperation with the movable platform (61).

3. The liquid silicone molding apparatus according to claim 2, characterized in that, The frame (1) is provided with a horizontally arranged slide rail (12) and a translation drive mechanism for driving the moving platform (61) to move back and forth along the slide rail (12). The bottom of the moving platform (61) is provided with a bracket, and the bracket is provided with a number of pulleys that slide in cooperation with the slide rail (12).

4. The liquid silicone molding apparatus according to claim 1, 2, or 3, characterized in that, The upper mold (31) includes a runner plate assembly and a mold core (315) located below the runner plate assembly. The runner is located inside the runner plate assembly. The heat insulation structure includes a heat insulation plate (314) disposed between the runner plate assembly and the mold core (315) and a needle valve nozzle (7) disposed at the outlet of the runner. The needle valve nozzle (7) is used to open and close the runner.

5. The liquid silicone molding apparatus according to claim 4, characterized in that, The flow channel includes an injection port, a flow channel groove (92) communicating with the injection port, and several glue inlet channels (93) communicating with the flow channel groove (92) and the cavity (3a). Each glue inlet channel (93) is provided with the above-mentioned needle valve nozzle (7). The needle valve nozzle (7) includes a tube body, a valve needle (73) inserted into the tube body, and a piston (74) connected to the valve needle (73). The two ends of the tube body are respectively connected to the flow channel groove (92) and the cavity (3a). The flow channel plate assembly is provided with several limiting holes (312a) corresponding to the needle valve nozzle (7). The piston (74) is slidably disposed in the limiting hole (312a) and divides the limiting hole (312a) into upper and lower chambers. Each chamber is connected to a pneumatic pipeline.

6. The liquid silicone molding apparatus according to claim 5, characterized in that, It also includes a cooling system, which includes a cooling channel and a delivery pump (81) for delivering coolant to the cooling channel. The pipe body includes an outer pipe body (71) and an inner pipe body (72). The inner pipe body (72) is inserted into the outer pipe body (71). Both ends of the inner pipe body (72) are fixedly connected to the outer pipe body (71), and there is a gap between the middle of the inner pipe body (72) and the outer pipe body (71) to form a heat insulation cavity (7a). The cooling channel is connected to the heat insulation cavity (7a).

7. The liquid silicone molding apparatus according to claim 6, characterized in that, The cooling system also includes a temperature sensor (82) and a controller for controlling the delivery pump (81). The temperature sensor (82) is communicatively connected to the controller and is used to detect the temperature at the needle valve nozzle (7).

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