Negative pressure suction type silica gel pad forming mold

Abstract

The utility model discloses a negative pressure suction type silica gel pad forming die which comprises a fixed die, a movable die arranged above the fixed die and a cavity arranged at the top of the fixed die, and the inner side of the cavity is movably connected with a negative pressure suction plate in a sealed mode. After the movable mold and the fixed mold are closed and when the negative pressure suction plate is located at the bottommost part of the cavity, a forming cavity is formed between the top of the negative pressure suction plate and the bottom of the movable mold, and an air cylinder used for driving the negative pressure suction plate to ascend and descend is arranged at the bottom of the fixed mold. According to the negative-pressure suction type silica gel pad forming mold, through mutual cooperation of the arranged negative-pressure suction plate and the air cylinder used for driving the negative-pressure suction plate to ascend and descend, gas in the cavity can be pushed out upwards before injection molding, and melt can be sucked downwards during mold closing injection molding, so that the flowing filling speed of the melt is increased, and the production efficiency is improved. And the possibility of generating bubbles in the product can be reduced.

Description

Technical Field

[0001] The utility model relates to the field of silicone pad production molds, in particular to a negative pressure suction type silicone pad molding mold. Background Art

[0002] With the continuous development of society, molds are widely used in modern product production due to their high processing efficiency, good interchangeability and saving of raw materials.

[0003] At present, the production of silicone pads often requires injection molding through injection molds. The injection mold generally consists of a movable mold, a fixed mold, and a molding cavity. After the movable mold and the fixed mold are combined, the molten material is injected into the molding cavity and then waited for cooling to form the silicone pad. In the prior art, due to the presence of gas in the molding cavity, bubbles are easily present inside the product during injection molding, and the silicone material in the molten state has poor fluidity, and the speed of filling the molding cavity is slow, the production efficiency is low, and the molding is often not in place.

[0004] Therefore, it is necessary to propose a negative pressure suction silicone pad molding mold to solve the above problems. Utility Model Content

[0005] The main purpose of the utility model is to provide a negative pressure suction type silicone pad forming mold, which can effectively solve the problems in the background technology.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A negative pressure suction silicone pad forming mold comprises a fixed mold, a movable mold arranged above the fixed mold and a cavity arranged at the top of the fixed mold, the inner side of the cavity is movably sealed and connected with a negative pressure suction plate, and a forming cavity is formed between the top of the negative pressure suction plate and the bottom of the movable mold when the movable mold is closed with the fixed mold and the negative pressure suction plate is located at the bottom of the cavity, and a cylinder for driving the negative pressure suction plate to rise and fall is arranged at the bottom of the fixed mold.

[0008] Preferably, a sealing assembly is provided on the four sides of the negative pressure suction plate, and the sealing assembly includes a groove arranged on the four side walls of the negative pressure suction plate, and the inner side of the groove is movably connected with a sealing strip that fits tightly with the inner wall of the cavity, and a first spring is provided between the sealing strip and the inner wall of the groove, and the first spring is always in a contracted state.

[0009] Preferably, the side wall of the movable mold is provided with a first guide column, the side wall of the fixed mold is provided with a guide block corresponding to the first guide column, and the first guide column and the guide block are movably guided and matched.

[0010] Preferably, second guide pillars are symmetrically arranged at the four corners of the bottom of the negative pressure suction plate, and the lower ends of the second guide pillars extend to the bottom of the fixed mold and are movably connected to the fixed mold through linear bearings.

[0011] Preferably, a sealing groove is arranged on the periphery of the top of the fixed mold, and the sealing groove is arranged around the edge of the cavity, and a sealing boss movably plugged into and matched with the sealing groove is arranged on the periphery of the bottom of the movable mold.

[0012] Preferably, it also includes a lifting and stripping assembly for separating the molded silicone pad from the negative pressure suction plate, the lifting and stripping assembly includes a lifting rod movably connected to the inner side of the second guide column, the four corners of the negative pressure suction plate are provided with through holes corresponding to the second guide columns, the bottom of the lifting rod extends to the bottom of the second guide column and is provided with a moving rack, the side wall of the lower end of the second guide column is provided with a mounting frame, the mounting frame is rotatably connected with a gear meshing with the moving rack, and the four corners of the bottom of the fixed mold are provided with fixed racks corresponding to the side of the gear away from the moving rack.

[0013] Preferably, an expansion groove with an inner diameter larger than the diameter of the lifting rod is provided on the inner side of the second guide column, and a limiting flange slidably matched with the expansion groove is provided at the corresponding position of the outer wall of the lifting rod and the expansion groove, and a second spring is provided at the upper end of the limiting flange, and the upper end of the lifting rod extends to the inner side of the through hole and cooperates with the through hole in a movable seal, and when the limiting flange is located at the bottom of the expansion groove, the top of the lifting rod is flush with the top of the negative pressure suction plate.

[0014] Compared with the prior art, the utility model provides a negative pressure suction type silicone pad forming mold, which has the following beneficial effects:

[0015] The negative pressure suction silicone pad molding mold can push the gas in the cavity upward before injection molding through the mutual cooperation of the negative pressure suction plate and the cylinder used to drive the negative pressure suction plate to rise and fall, and can suck the molten material downward during mold closing injection molding, which not only improves the flow filling rate of the molten material, but also reduces the possibility of bubbles generated inside the product. In addition, after molding, the molded silicone pad can be pushed out of the cavity, and the silicone pad can be separated from the negative pressure suction plate by cooperating with the ejection component to facilitate removal.

[0016] The negative pressure suction type silicone pad forming mold has a sealing component arranged around the negative pressure suction plate, which can increase the stability and sealing between the negative pressure suction plate and the inner wall of the cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model;

[0018] Figure 2 This is a structural schematic diagram of the utility model from the bottom perspective of the fixed mold;

[0019] Figure 3 It is a schematic diagram of the inner structure of the fixed mold after the negative pressure suction plate of the utility model is removed;

[0020] Figure 4This is a schematic diagram of the structure of the utility model in which the sealing strip and the negative pressure suction plate are separated;

[0021] Figure 5 It is a structural schematic diagram of the ejection assembly of the utility model;

[0022] Figure 6 It is a schematic diagram of the cross-sectional structure of the second guide column of the utility model.

[0023] In the figure: 1. movable mold; 2. fixed mold; 3. base frame; 4. negative pressure suction plate; 5. sealing boss; 6. sealing groove; 7. first guide column; 8. guide block; 9. cylinder; 10. second guide column; 11. fixed rack; 12. cavity; 13. lifting rod; 14. sealing strip; 15. first spring; 16. groove; 17. through hole; 18. mounting frame; 19. movable rack; 20. gear; 21. expansion groove; 22. second spring; 23. limit flange. DETAILED DESCRIPTION

[0024] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0025] like Figure 1-6 As shown, a negative pressure suction type silicone pad forming mold comprises a fixed mold 2, a movable mold 1 arranged above the fixed mold 2 and a cavity 12 arranged at the top of the fixed mold 2, the side wall of the movable mold 1 is provided with a first guide column 7, the side wall of the fixed mold 2 is provided with a guide block 8 corresponding to the first guide column 7, and the first guide column 7 and the guide block 8 are movably guided and cooperated, the fixed mold 2 is arranged on the base frame 3, and the inner side of the cavity 12 is movably sealed and connected with a negative pressure suction plate 4. After the movable mold 1 and the fixed mold 2 are molded together and the negative pressure suction plate 4 is located at the bottom of the cavity 12, a molding cavity is formed between the top of the negative pressure suction plate 4 and the bottom of the movable mold 1, and second guide columns 10 are symmetrically arranged at the four corners of the bottom of the negative pressure suction plate 4, and the lower end of the second guide column 10 extends to the bottom of the fixed mold 2 and is movably connected to the fixed mold 2 through a linear bearing, and the bottom of the fixed mold 2 is provided with a cylinder 9 for driving the negative pressure suction plate 4 to rise and fall.

[0026] Furthermore, in order to further increase the sealing between the negative pressure suction plate 4 and the inner wall of the cavity 12, a sealing component is provided on the four sides of the negative pressure suction plate 4, and the sealing component includes a groove 16 provided on the four sides of the negative pressure suction plate 4. The inner side of the groove 16 is movably connected with a sealing strip 14 that fits tightly with the inner wall of the cavity 12. A first spring 15 is provided between the sealing strip 14 and the inner wall of the groove 16, and the first spring 15 is always in a contracted state.

[0027] In order to increase the sealing of the mold between the movable mold 1 and the fixed mold 2, a sealing groove 6 is arranged on the top periphery of the fixed mold 2, and the sealing groove 6 is arranged around the edge of the cavity 12. A sealing boss 5 that is movably plugged into the sealing groove 6 is arranged on the bottom periphery of the movable mold 1.

[0028] Furthermore, it also includes a push-off assembly for separating the formed silicone pad from the negative pressure suction plate 4, the push-off assembly includes a lifting rod 13 movably connected to the inner side of the second guide column 10, and the four corners of the negative pressure suction plate 4 are provided with through holes 17 corresponding to the second guide column 10 one by one, the bottom of the lifting rod 13 extends to the bottom of the second guide column 10 and is provided with a movable rack 19, and the side wall of the lower end of the second guide column 10 is provided with a mounting frame 18, and the mounting frame 18 is rotatably connected to a gear 20 meshing with the movable rack 19, and the four corners of the bottom of the fixed mold 2 are provided with gears meshing with the gears. 20 is away from the fixed rack 11 corresponding to the side of the movable rack 19, and the inner side of the second guide column 10 is provided with an expansion groove 21 whose inner diameter is larger than the diameter of the lifting rod 13, and the corresponding part of the outer wall of the lifting rod 13 and the expansion groove 21 is provided with a limiting flange 23 which slidably cooperates with the expansion groove 21, and the upper end of the limiting flange 23 is provided with a second spring 22, the upper end of the lifting rod 13 extends to the inner side of the through hole 17 and cooperates with the through hole 17 in an active sealing manner, and when the limiting flange 23 is located at the bottom of the expansion groove 21, the top of the lifting rod 13 is flush with the top of the negative pressure suction plate 4.

[0029] It should be noted that the utility model is a negative pressure suction silicone pad molding mold. When the movable mold 1 and the fixed mold 2 are closed, the sealing boss 5 and the sealing groove 6 are plugged and sealed. The first guide column 7 cooperates with the guide block 8 for guiding. Before injection molding, the control cylinder 9 drives the negative pressure suction plate 4 to rise, and then the negative pressure suction plate 4 pushes the air in the cavity 12 out of the injection port, and the rising gear 20 will not mesh with the fixed rack 11 this time. While injection molding, the control cylinder 9 drives the negative pressure suction plate 4 to move downward, and negative pressure is generated on the top of the negative pressure suction plate 4. During the downward displacement of the negative pressure suction plate 4, the molten material is sucked downward, which accelerates the flow and filling of the molten material until the negative pressure suction plate 4 moves to the lowermost end of the cavity 12, and then waits for cooling and molding to separate the movable mold 1 and the fixed mold 2, and the control cylinder 9 drives the negative pressure suction plate 4 to rise again, and the negative pressure suction plate 4 pushes the formed silicone The pad is pushed out of the cavity 12. The rising height this time needs to be greater than the rising height during exhaust, until the gear 20 is meshed with the fixed rack 11, and then the other side of the gear 20 drives the movable rack 19 to rise, and the movable rack 19 drives the lifting rod 13 to rise, and the lifting rod 13 compresses the second spring 22 through the limiting flange 23, and the upper end of the lifting rod 13 protrudes from the top of the negative pressure suction plate 4, so that the lifting rod 13 pushes the silicone pad and the negative pressure suction plate 4 apart to facilitate removal, and then the cylinder 9 drives the negative pressure suction plate 4 to move downward and reset, the gear 20 is separated from the fixed rack 11, the second spring 22 is reset, and the upper end of the lifting rod 13 is hidden in the through hole 17 again. In addition, the reverse force generated by the first spring 15 always acts on the sealing strip 14, and the sealing strip 14 is always in a tight fit with the inner wall of the cavity 12 to ensure sealing.

[0030] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A negative pressure suction silicone pad forming mold, comprising a fixed mold (2), a movable mold (1) arranged above the fixed mold (2), and a cavity (12) arranged at the top of the fixed mold (2), characterized in that: The inner side of the cavity (12) is movably sealed and connected to a negative pressure suction plate (4); after the movable mold (1) and the fixed mold (2) are molded together and the negative pressure suction plate (4) is located at the bottom of the cavity (12), a molding cavity is formed between the top of the negative pressure suction plate (4) and the bottom of the movable mold (1); and a cylinder (9) for driving the negative pressure suction plate (4) to move up and down is provided at the bottom of the fixed mold (2).

2. The negative pressure suction silicone pad forming mold according to claim 1, characterized in that: The negative pressure suction plate (4) is provided with a sealing assembly on the sides thereof. The sealing assembly comprises a groove (16) provided on the side walls thereof. The inner side of the groove (16) is movably connected with a sealing strip (14) which is tightly fitted with the inner wall of the cavity (12). A first spring (15) is provided between the sealing strip (14) and the inner wall of the groove (16), and the first spring (15) is always in a contracted state.

3. The negative pressure suction silicone pad forming mold according to claim 1, characterized in that: The side wall of the movable mold (1) is provided with a first guide column (7), and the side wall of the fixed mold (2) is provided with a guide block (8) corresponding to the first guide column (7), and the first guide column (7) and the guide block (8) are movably guided and matched.

4. The negative pressure suction silicone pad forming mold according to claim 2, characterized in that: Second guide pillars (10) are symmetrically arranged at the four corners of the bottom of the negative pressure suction plate (4); the lower ends of the second guide pillars (10) extend to the bottom of the fixed mold (2) and are movably connected to the fixed mold (2) via linear bearings.

5. The negative pressure suction silicone pad forming mold according to claim 1, characterized in that: The top periphery of the fixed mold (2) is provided with a sealing groove (6), which is arranged around the edge of the cavity (12), and the bottom periphery of the movable mold (1) is provided with a sealing boss (5) that is movably plugged into and matched with the sealing groove (6).

6. The negative pressure suction silicone pad forming mold according to claim 4, characterized in that: The invention also comprises a push-off assembly for separating the formed silicone pad from the negative pressure suction plate (4), the push-off assembly comprising a lifting rod (13) movably connected to the inner side of the second guide column (10), the four corners of the negative pressure suction plate (4) are provided with through holes (17) corresponding to the second guide column (10), the bottom of the lifting rod (13) extends to the bottom of the second guide column (10) and is provided with a movable rack (19), the side wall of the lower end of the second guide column (10) is provided with a mounting frame (18), the mounting frame (18) is rotatably connected with a gear (20) meshing with the movable rack (19), and the four corners of the bottom of the fixed mold (2) are provided with fixed racks (11) corresponding to the side of the gear (20) away from the movable rack (19).

7. The negative pressure suction silicone pad forming mold according to claim 6, characterized in that: An expansion groove (21) having an inner diameter larger than the diameter of the lifting rod (13) is provided on the inner side of the second guide column (10); a limit flange (23) slidably engaged with the expansion groove (21) is provided at the outer wall of the lifting rod (13) corresponding to the expansion groove (21); a second spring (22) is provided at the upper end of the limit flange (23); the upper end of the lifting rod (13) extends to the inner side of the through hole (17) and is movably sealed with the through hole (17); and when the limit flange (23) is located at the bottom of the expansion groove (21), the top of the lifting rod (13) is flush with the top of the negative pressure suction plate (4).

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