Sealing mechanism for silica gel mold

Abstract

The utility model belongs to the technical field of injection molds, and particularly discloses a sealing mechanism for a silica gel mold, which is used for injection molding of liquid silica gel materials and comprises a front mold and a rear mold matched with the front mold. The front mold comprises a cold runner and a plate A, a plate A forming cavity is formed in the plate A, the cold runner is communicated with the plate A forming cavity, and a sealing ring is mounted at a first seam of the cold runner and the plate A forming cavity. According to the utility model, the molding cavity and the ejection mechanism arranged in the mold are isolated from the outside; and sealing rings are respectively arranged between the cold runner and the plate A, on the parting surface of the front mold, between the front mold and the base plate, between the plate B and the bottom plate, and between the ejection mechanism and external communicating parts, so that the sealing rings are stressed to deform through the fastening pressure between every two parts, and the isolation effect is achieved. And the quality of the product in the production process is improved, the production cost is reduced, and wide market prospects and economic benefits are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of injection molds, and particularly relates to a sealing mechanism for a silicone mold. Background Technique

[0002] Liquid silicone is relative to solid high-temperature vulcanized silicone rubber. It is a liquid glue with good fluidity and fast vulcanization. It is safer and more environmentally friendly and can fully meet the requirements of food grade.

[0003] The fluidity of liquid silicone is very good. If there is air in the internal forming cavity of the mold, it is very easy to trap air during injection molding, resulting in incomplete filling of the product and the generation of bubbles, thus causing the product to be unqualified and increasing production costs.

[0004] At present, the problem of trapped air, incomplete filling and bubble generation is mainly solved by the form of vacuum pumping to avoid affecting the quality of the product during the production process. However, the vacuum pumping method will still increase the production cost. Also, since the internal forming cavity of the mold communicates with the outside air, the problem of trapped air, incomplete filling and bubble generation cannot be solved. Content of the Utility Model

[0005] The utility model provides a sealing mechanism for a silicone mold, aiming to isolate the internal forming cavity of the mold from the outside air by setting a sealing ring to avoid affecting the quality of the product during the production process. In addition, it also replaces the vacuum pumping method adopted in the prior art to solve the problems of trapped air, incomplete filling and bubble generation, and reduce the production cost.

[0006] The technical problems to be solved by the utility model are achieved by the following technical solutions:

[0007] A sealing mechanism for a silicone mold, used for injecting liquid silicone material, includes a front mold and a rear mold that cooperates with the front mold;

[0008] The front mold includes a cold runner and an A plate, and an A plate forming cavity is provided on the A plate. The cold runner and the A plate forming cavity are connected, and a sealing ring is installed at the first joint between the two to seal the gap at the first joint between the cold runner and the A plate forming cavity. The cold runner, the channel on the sealing ring and the A plate forming cavity are sequentially connected;

[0009] The rear mold includes a B plate and an ejection mechanism. The ejection mechanism is used to eject the product on the rear mold. A B plate forming cavity is provided on the B plate. The ejection mechanism is movably sleeved on the B plate, and the top of the ejection mechanism extends out of the B plate. A sealing ring is installed at the second joint between the ejection mechanism and the side where the B plate forming cavity is located to seal the gap at the second joint.

[0010] Preferably, the cold runner is used for flowing liquid silicone.

[0011] Preferably, a sealing ring is provided on the bottom surface of the A plate. Due to the pressure generated by the fastening between the cold runner and the A plate, the sealing ring deforms under the force, isolating the cold runner, the molding cavity of the A plate, and the outside.

[0012] Preferably, a front mold parting surface is provided on the front mold, and a sealing ring is provided on the front mold parting surface. Due to the clamping pressure between the front mold and the rear mold, the sealing ring deforms under the force, isolating the molding cavity on the front mold, the molding cavity on the rear mold, and the outside.

[0013] Preferably, external communication parts are provided on the rear mold, and a sealing ring is also provided at the third joint between the ejection mechanism and the external communication parts.

[0014] Adopting the above scheme, through the clamping of the front mold and the rear mold, the clamping pressure makes the sealing ring deform under the force, isolating the ejection mechanism and the outside.

[0015] Preferably, a bottom plate, square iron, and backing plate are respectively provided on the rear mold. The bottom plate, square iron, and backing plate are fixedly connected from bottom to top, and the B plate is provided on the top of the backing plate. A sealing ring is provided on the bottom surface of the B plate. Due to the fastening pressure between the B plate and the backing plate, the sealing ring deforms under the force, isolating the molding cavity of the B plate and the backing plate from the outside. Sealing rings are respectively provided on the top and bottom surfaces of the square iron. Due to the fastening pressure between the B plate and the bottom plate, the sealing ring deforms under the force to isolate the ejection mechanism and the outside.

[0016] Preferably, the ejection mechanism includes a top plate and ejector pins. The top plate is provided on the bottom plate, the bottom of the ejector pin is installed on the top plate, and the ejector pin sequentially penetrates the square iron, backing plate, and B plate from bottom to top to reach the B plate parting surface. The top plate is connected to an external connecting part.

[0017] Adopting the above scheme, through external driving (such as a cylinder), the external connecting part is driven (there are many external connecting parts in the market, such as a connecting rod. At this time, one end of the connecting rod is connected to the output end of the cylinder, and the other end is connected to the top plate. The connecting rod is also rotatably installed on the rear mold, so that the connecting rod makes a seesaw motion relative to the rear mold under the drive of the cylinder and the connection of the rear mold, thereby driving the top plate to move), thereby driving the top plate to move upward, and then driving the ejector pin to move upward. Thus, after the front mold and the rear mold are separated, the ejector pin moves upward to eject the product.

[0018] Preferably, the sealing rings on the B plate and the backing plate are divided into two groups and are mirror - image arranged, and the number of sealing rings in each group is four.

[0019] Preferably, the sealing ring located on the front mold parting surface is annular, and the number of the ejection mechanisms is multiple. The annular sealing ring surrounds the ejector pins on the ejection mechanism.

[0020] Preferably, an annular sealing ring is also provided on the bottom surface of the B plate, and the annular sealing ring surrounds the support head for supporting the device located on the B plate.

[0021] Preferably, the mold is also provided with an air extraction hole, which is communicated with an external vacuum pump, and is used to evacuate the gas in the forming cavity inside the mold by pumping air through the external vacuum pump.

[0022] Preferably, the sealing ring is strip-shaped, and its end face has a structure with an upper arc, a middle square, and a lower tip. Grooves are provided on both sides of the sealing ring along its length direction. Flanges matching the grooves are provided on the front mold and / or the rear mold. The grooves and the flanges cooperate to install the sealing ring on the front mold and / or the rear mold.

[0023] Furthermore, the structure with an upper arc, a middle square, and a lower tip includes a square structure, an arc structure, and a tip structure. The top and bottom of the square structure are respectively connected to the arc structure and the tip structure.

[0024] It should be noted that the square structure is a rectangular structure, and the material of the sealing ring is rubber.

[0025] Adopting the above scheme, the sealing ring is designed with a structure of an upper arc, a middle square, and a lower tip, and grooves are provided on its side. The purpose is to facilitate the installation of the sealing ring on the mold to play a sealing role. Specifically, the grooves and the arc structure facilitate the overall insertion of the sealing ring into the corresponding position of the mold. Among them, the grooves cooperate with the flanges to install the sealing ring on the front mold and / or the rear mold, and make the sealing ring have more contact surfaces with the template on the mold. The purpose of setting the tip structure is to protrude the template surface on the mold, so that when the components on the mold come into contact with each other, the tip structure part is compressed and deformed to play a sealing effect.

[0026] Preferably, a through hole is provided in the structure with an upper arc, a middle square, and a lower tip, and the direction of the through hole extends along the length direction of the sealing ring.

[0027] Furthermore, the through hole is provided in the rectangular structure.

[0028] Adopting the above scheme, setting the through hole in the rectangular structure is to reduce the weight and facilitate the pressure deformation effect, so as to better make the sealing ring play a sealing role on the mold and ensure the quality during silicone injection molding.

[0029] The beneficial effects of the present utility model are as follows: The present utility model isolates the internal forming cavity and ejection mechanism of the mold from the outside; and seals are respectively arranged between the cold runner and the A plate, on the front mold parting surface, between the front mold and the backing plate, between the B plate and the bottom plate, and between the ejection mechanism and the externally connected parts. The purpose is to make the seal deform under the fastening pressure between the two parts, so as to play an insulating role. The present utility model can be widely applied to the design of liquid silicone rubber molds, improve the quality in the product production process, reduce the production cost, and has broad market prospects and economic benefits. Brief Description of the Drawings

[0030] Figure 1 It is a product drawing of injecting liquid silicone rubber material on a thermoplastic material made by the present utility model;

[0031] Figure 2 It is a sectional view of the present utility model;

[0032] Figure 3 It is a schematic diagram of the position of the seal between the cold runner and the A plate in the present utility model;

[0033] Figure 4 It is a schematic diagram of the position of the seal on the front mold parting surface in the present utility model;

[0034] Figure 5 It is a schematic diagram of the position of the seal between the front mold and the backing plate in the present utility model;

[0035] Figure 6 It is a schematic diagram of the position of the seal between the B plate and the bottom plate in the present utility model;

[0036] Figure 7 It is a schematic diagram of the position of the seal between the ejection mechanism and the externally connected parts in the present utility model;

[0037] Figure 8 It is a schematic diagram of the structure of the seal in the straightened state in the present utility model;

[0038] Figure 9 It is a schematic diagram of the structure of the seal in the bent state in the present utility model;

[0039] In the figure: Liquid silicone rubber material 1; Reinforced nylon material 2; Front mold 3; Rear mold 4; Backing plate 5; B plate 6; Front mold parting surface 7; A plate 8; Cold runner 9; Seal 10; Arc structure 1001; Pointed head structure 1002; Through hole 1003; Groove 1004; Rectangular structure 1005; Ejection mechanism 11, Bottom plate 12; Square iron 13; Top plate 14; Ejector pin 15. Detailed Embodiment

[0040] In order to easily understand the technical means, creative features, achieved purposes and effects of the present utility model, the present utility model will be further described below with reference to specific illustrations.

[0041] As Figure 2 shown, a sealing mechanism for a silicone mold is used for injecting liquid silicone material 1 (as shown in the figure) onto a thermoplastic material (such as reinforced nylon material 2). The material in its lower part is a thermoplastic material, such as PBT-GF20, and the material in its upper part is liquid silicone. It includes a front mold 3 and a rear mold 4 that cooperates with the front mold 3. A front mold parting surface 7 is provided on the front mold 3, and a sealing ring 10 is arranged on the front mold parting surface 7. Through the clamping pressure of the front mold 3 and the rear mold 4, the sealing ring 10 is deformed by the force, isolating the molding cavities on the front mold 3 and the rear mold 4 from communicating with the outside (as shown in the figure). Figure 1 As Figure 4 shown.

[0042] The front mold 3 includes a cold runner 9 for flowing liquid silicone and an A plate 8, and an A plate molding cavity is provided on the A plate 8. The cold runner 9 and the A plate molding cavity are connected, and a sealing ring 10 is installed at the first joint between the two to seal the gap at the first joint between the cold runner 9 and the A plate molding cavity. The cold runner 9, the channels on the sealing ring 10 and the A plate molding cavity are connected in sequence. Specifically, the sealing ring 10 is arranged on the bottom surface of the A plate 8. Through the pressure generated by the fastening between the cold runner 9 and the A plate 8, the sealing ring 10 is deformed by the force, isolating the cold runner 9 and the A plate molding cavity from communicating with the outside (as shown in the figure). Figure 3 shown.

[0043] The rear mold 4 includes a B plate 6 and an ejection mechanism 11. The ejection mechanism 11 is used to eject the product on the rear mold. A B plate molding cavity is provided on the B plate 6. The ejection mechanism 11 is movably sleeved on the B plate 6, and the top of the ejection mechanism 11 extends out of the B plate 6. A sealing ring 10 is installed at the second joint between the ejection mechanism 11 and the side where the B plate molding cavity is located to seal the gap at the second joint (as shown in the figure). The ejection mechanism 11 is used to eject the product, and the sealing ring 10 arranged on the ejection mechanism 11 is used to isolate the parts inside the mold from communicating with the outside. Specifically, external communicating parts are arranged on the rear mold 4, and a sealing ring 10 is also arranged at the third joint between the ejection mechanism 11 and the external communicating parts (as shown in the figure). Figure 7 As Figure 6As shown in the figure); adopting the above solution, by closing the front mold 3 and the rear mold 4, the closing pressure causes the sealing ring to deform under force, isolating the ejection mechanism 11 from communicating with the outside; on the rear mold 4, there are also a bottom plate 12, square iron 13, and backing plate 5 respectively; the bottom plate 12, square iron 13, and backing plate 5 are fixedly connected together from bottom to top by screws, and the B plate 6 is arranged on the top of the backing plate 5. A sealing ring 10 is arranged on the bottom surface of the B plate 6. Through the fastening pressure between the B plate 6 and the backing plate 5, the sealing ring 10 deforms under force, isolating the B plate forming cavity and the backing plate 5 from communicating with the outside (as Figure 5 shown); sealing rings 10 are arranged on the top and bottom surfaces of the square iron 13 respectively. Through the fastening pressure between the B plate 6 and the bottom plate, the sealing ring deforms under force to isolate the ejection mechanism 11 from communicating with the outside (as Figure 6 shown); the ejection mechanism 11 includes a top plate 14 and ejector pins 15. The top plate 14 is arranged on the bottom plate 12, and the bottom of the ejector pin 15 is installed on the top plate 14. The ejector pin 15 sequentially penetrates the square iron 13, backing plate 5, and B plate 6 from bottom to top to reach the B plate parting surface 7. The top plate 14 is connected to the external ejector rod; through external driving (such as a cylinder), the external connecting member is driven to move (there are many external connecting members in the market, such as a connecting rod. At this time, one end of the connecting rod is connected to the output end of the cylinder, and the other end is connected to the top plate 14. The connecting rod is also rotatably installed on the rear mold 4, so that under the drive of the cylinder and connected to the rear mold 4, the connecting rod makes a seesaw movement relative to the rear mold 4, thereby driving the top plate 14 to move), thereby driving the top plate 14 to move upward, and then driving the ejector pin 15 to move upward. Thus, after the front mold 3 and the rear mold 4 are demolded, the ejector pin moves upward to eject the product; in order to make the sealing rings 10 fully contact with each part on the mold, the depth of the sealing ring groove set on each part of the mold is 0.3 - 0.5 mm lower than the height of the sealing ring (if there are still gaps in each part of the mold, the groove depth should be further subtracted by the gap height. For example: gap 1.0 mm, actual groove depth = sealing ring height 6.0 - 0.5 - gap height 1.0 = 4.5 mm). The mold is also provided with air extraction holes, which are connected to an external vacuum pump for evacuating the gas in the forming cavity inside the mold through the pumping of the external vacuum pump;

[0044] The sealing rings 10 on the B plate 6 and the backing plate 5 are divided into two groups and are arranged in a mirror image. The number of sealing rings 10 in each group is four.

[0045] The sealing ring 10 located on the front mold parting surface 7 is annular, and the number of ejection mechanisms 11 is multiple. The annular sealing ring surrounds the ejector pin 14 on the ejection mechanism 11.

[0046] An annular sealing ring is also arranged on the bottom surface of the B plate 6, and the annular sealing ring surrounds the support pins on the B plate 6 for supporting the device.

[0047] As Figures 8-9As shown, the sealing ring 10 is strip-shaped, made of rubber, and its end face has an upper arc, a middle square, and a lower pointed structure, which is formed by connecting the top and bottom of the rectangular structure 1005 to the arc-shaped structure 1001 and the pointed structure 1002 respectively. Grooves 1004 are provided on both sides of the sealing ring 10 along its length direction. A through hole 1003 is provided on the rectangular structure 1005, and the direction of the through hole 1003 extends along the length direction of the sealing ring 10.

[0048] With the above solution, the sealing ring 10 is designed with an upper arc, a middle square, and a lower pointed structure, and grooves 1004 are provided on its side. The purpose is to facilitate the installation of the sealing ring 10 on the mold to play a sealing role. Specifically, the grooves 1004 and the arc-shaped structure 1001 facilitate the overall insertion of the sealing ring 10 into the corresponding position of the mold (it should be noted here that flanges matching the grooves 1004 are provided on the front mold 3 and / or the rear mold 4. The grooves 1004 and the flanges cooperate to enable the sealing ring 10 to be inserted into the front mold 3 and / or the rear mold 4 as a whole like the heat insulation strip on aluminum alloy doors and windows), and make the sealing ring 10 have more contact surfaces with the template on the mold. The purpose of setting the pointed structure 1002 is to protrude from the template surface on the mold, so that when the components on the mold come into contact with each other, the pointed structure 1002 is partially compressed and deformed to achieve a sealing effect; a through hole 1003 is provided on the rectangular structure 1005, and the purpose is to reduce the weight and facilitate compression deformation, so as to better enable the sealing ring 10 to play a sealing role on the mold to ensure the quality of silicone injection molding. In addition, the overall structure of the sealing ring 10 has better elasticity, fits the template surface on the mold better after being compressed, and its length can be arbitrarily cut, making it easy to install and replace.

[0049] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sealing mechanism for a silicone mold, used for injection molding liquid silicone material, characterized in that: It includes a front mold and a rear mold matched with the front mold; The front mold includes a cold runner and an A plate, and the A plate is provided with an A plate molding cavity, the cold runner and the A plate molding cavity are connected, and a sealing ring is installed at the first seam between the two to seal the gap at the first seam between the cold runner and the A plate molding cavity, and the cold runner, the channel on the sealing ring and the A plate molding cavity are connected in sequence; The rear mold includes a B plate and an ejection mechanism, the B plate is provided with a B plate forming cavity, the ejection mechanism is movably sleeved on the B plate, and the top of the ejection mechanism extends out of the B plate, and a sealing ring is installed at the second seam of the edge where the ejection mechanism and the B plate forming cavity are located, which is used to seal the gap at the second seam.

2. A sealing mechanism for a silicone mold according to claim 1, characterized in that: A sealing ring is arranged on the bottom surface of the A plate, and the sealing ring is deformed by the pressure generated by the fastening between the cold runner and the A plate, thereby isolating the cold runner and the A plate molding cavity from being connected to the outside world.

3. A sealing mechanism for a silicone mold according to claim 1, characterized in that: The front mold is provided with a front mold parting surface, and a sealing ring is arranged on the front mold parting surface. The sealing ring is deformed by the clamping pressure of the front mold and the rear mold, thereby isolating the molding cavity on the front mold and the molding cavity on the rear mold from being connected with the outside.

4. A sealing mechanism for a silicone mold according to claim 1, characterized in that: The rear mold is provided with external connecting parts, and a sealing ring is also provided at the third joint between the ejection mechanism and the external connecting parts.

5. The sealing mechanism for a silicone mold according to claim 1, characterized in that: The rear mold is also provided with a bottom plate, a square iron and a pad, respectively; the bottom plate, the square iron and the pad are fixedly connected from bottom to top, and the B plate is arranged on the top of the pad, a sealing ring is arranged on the bottom surface of the B plate, and the sealing ring is deformed by the tightening pressure between the B plate and the pad, thereby isolating the B plate molding cavity and the pad from being connected to the outside world, and sealing rings are arranged on the top and bottom surfaces of the square iron, respectively, and the sealing ring is deformed by the tightening pressure between the B plate and the bottom plate, thereby isolating the ejection mechanism from being connected to the outside world.

6. A sealing mechanism for a silicone mold according to claim 5, characterized in that: The ejection mechanism includes an ejector plate and an ejector pin. The ejector plate is arranged on the bottom plate. The bottom of the ejector pin is installed on the ejector plate. The ejector pin passes through the square iron, the pad plate, and the B plate from bottom to top in sequence to reach the parting surface of the B plate. The ejector plate is connected to an external connector.

7. The sealing mechanism for a silicone mold according to claim 1, characterized in that: The sealing ring is in the shape of an elongated strip, and its end face is a structure with a square upper arc and a pointed lower edge. Grooves are provided on both sides of the sealing ring along its length direction. The front mold and / or the rear mold are provided with flanges matching the grooves. The grooves and the flanges cooperate to allow the sealing ring to be installed on the front mold and / or the rear mold.

8. A sealing mechanism for a silicone mold according to claim 7, characterized in that: A through hole is provided in the square lower point structure in the upper arc, and the through hole extends along the length direction of the sealing ring.

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