A rubber injection mold

Abstract

The present invention belongs to the technical field of test equipment, and specifically relates to a rubber injection mold, the main structure of which includes an upper mold and a lower mold that are interlocked and connected, and a core arranged between the upper mold and the lower mold, and a rotating plug arranged on the upper mold and the lower mold. The rotating plug with a rotating hole in the center and an eccentric opening on the edge is pressed onto the upper mold and the lower mold at a position corresponding to the end of the core, and an air vent is provided at a position corresponding to the eccentric opening on the upper mold and the lower mold. The rotating plug is rotated to deviate or connect the eccentric opening and the air vent, so as to achieve a sealing or ventilation effect. The molding method of injecting rubber material by an injection head is adopted, so as to eliminate the phenomenon of uneven wall thickness of the product caused by eccentricity of the core caused by the squeezing of the rubber material on the core. The structure is simple and the principle is scientific and reliable. The product is processed by injection, so as to eliminate the influence of gravity on the wall thickness of the product, so that the wall thickness of the obtained product is uniform and consistent, meeting the precision requirements.

Description

Technical field:

[0001] The invention belongs to the technical field of test equipment, and in particular relates to a rubber injection mold capable of preparing rubber bag thin-wall products with uniform wall thickness. Background technology:

[0002] In the prior art, semi-closed cylindrical rubber bladder thin-walled products are mostly made by vulcanization molding. The production process is as follows: first, the mold is placed on a flat vulcanizer for preheating. After it is completely and evenly preheated, the preformed rubber cylinder is wrapped around the core, and the upper and lower molds are fastened together by positioning pins; then, it is placed on the flat vulcanizer again, and the upper and lower hot plates of the flat vulcanizer tightly press the mold together and heat and vulcanize; finally, after the set time is reached, the upper and lower hot plates of the vulcanizer are opened, the mold is opened and the rubber bladder thin-walled product is taken out. During the mold closing process, the rubber will squeeze the core in the middle. Since the core is a cantilever structure and is relatively long, the squeezing of the core by the rubber causes the core fixed at one end to bend in a certain direction, making the gap between the outer mold and the core uneven, resulting in uneven wall thickness of the molded rubber bladder thin-walled product, which cannot be used. For example, Chinese patent 202110937286.6 discloses an injection molding device for preventing core deformation of a slender tubular plastic product, including a core, a front mold and a rear mold. The front mold and the rear mold are provided with mold cavities corresponding to the core. The mold cavities of the front mold and the rear mold form a cavity with the core when the molds are closed. The front mold is provided with a flow channel communicating with the mold cavity. The injection molding device also includes a hydraulic core pulling mechanism. The front mold and the rear mold are provided with a plurality of supporting and fixing needles that are driven to extend and retract by the hydraulic core pulling mechanism. The supporting and fixing needles enter the cavity to support the core when extended, and exit the cavity when retracted. Chinese patent 202123329316.X discloses a mold for producing silicone products, comprising: a lower mold assembly, the lower mold assembly comprising a lower mold body and a core, the bottom of the core is integrally connected to a core column, the middle part of the lower mold body is provided with a first core mounting cavity and a core column mounting cavity that pass through the upper and lower parts in sequence, the core column and the core column mounting cavity are matched and installed with each other, the lower part of the core matches the shape of the first core mounting cavity, a first glue injection gap is left between the outer periphery of the core and the inner wall of the first core mounting cavity, the middle part of the core is respectively provided with an upper and a lower The high-pressure ventilation channel and injection channel are connected, and the bottom end of the high-pressure ventilation channel is provided with an air inlet for connecting to compressed gas. The upper mold assembly corresponding to the upper part of the lower mold assembly includes an upper mold body, and the middle part of the upper mold body is provided with a second core installation cavity. The upper part of the core and the shape of the second core installation cavity match each other. A second injection gap is left between the outer periphery of the core and the second core installation cavity, wherein the first injection gap and the second injection gap are interconnected, and the top ends of the high-pressure ventilation channel and the injection channel are respectively interconnected with the second injection gap. Therefore, a new rubber injection mold is developed and designed to solve the problem of uneven wall thickness of thin-walled rubber bladder products. Summary of the invention:

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and to develop a rubber injection mold to obtain a rubber bag thin-walled product with uniform wall thickness through an injection molding method.

[0004] In order to achieve the above purpose, the main structure of the rubber injection mold involved in the present invention includes an upper mold and a lower mold that are interlocked and connected, a core 4 set between the upper mold and the lower mold, and rotating plugs set on the upper mold and the lower mold.

[0005] The upper mold and lower mold involved in the present invention are connected by locking locating pins. The end of the lower mold is also provided with a mounting plate, and an injection head is provided on the mounting plate. The rotating plug is pressed on the upper mold and the lower mold by a pressure plate, and the upper mold and the lower mold are also provided with air holes.

[0006] The position of the injection head involved in the present invention corresponds to the position of the core; a rotating hole is provided in the center of the rotating plug, which does not pass through the rotating plug; an eccentric opening is provided on the edge, which passes through the rotating plug; the position of the air vent corresponds to and is connected to the position of the eccentric opening.

[0007] When the rubber injection mold involved in the present invention is used, rubber material is injected between the upper mold and the lower mold. The rubber material flows from top to bottom under the action of gravity. At the same time, air is prompted to flow downward and be discharged through the mutually connected vent holes and eccentric openings. After the rubber material is fully filled and 10% of the full volume of the rubber material overflows, the rotary plug is rotated to make the eccentric opening deviate from the vent hole. The rotary plug blocks the vent hole. The rotary plug is pressed by the pressure plate to achieve sealing. The rubber material is continued to be injected to form pressure between the upper mold and the lower mold to ensure the density of the product.

[0008] Compared with the prior art, the present invention presses a rotating plug with a rotating hole in the center and an eccentric opening on the edge onto the upper mold and the lower mold at positions corresponding to the core ends, and provides air holes at positions corresponding to the eccentric openings on the upper mold and the lower mold. The rotating plug is rotated to cause the eccentric opening and the air hole to deviate or connect, thereby achieving a sealing or ventilation effect. The molding method of injecting rubber material by an injection head is adopted, thereby eliminating the phenomenon of uneven wall thickness of the product caused by eccentricity of the core caused by the squeezing of the rubber material on the core. The present invention has a simple structure and a scientific and reliable principle. The product is processed by injection, thereby eliminating the influence of gravity on the wall thickness of the product, so that the wall thickness of the obtained product is uniform and consistent, meeting the precision requirements. Description of the drawings:

[0009] Figure 1 It is an exploded schematic diagram of the main structure of the present invention.

[0010] Figure 2 It is a schematic diagram of the appearance of the main structure of the present invention.

[0011] Figure 3 It is a cross-sectional view of the main structure of the present invention.

[0012] Figure 4 This is a schematic diagram of the 3D structure of the rotary plug involved in the present invention. Specific implementation methods:

[0013] The present invention will be further described below with reference to the accompanying drawings and specific implementation methods.

[0014] Example 1:

[0015] The main structure of the rubber injection mold involved in this embodiment includes an upper mold 1, a lower mold 2, a positioning pin 3, a core 4, a mounting plate 5, an injection head 6, a rotating plug 7, a pressure plate 8, a rotating hole 9, an eccentric port 10 and a vent 11; the upper mold 1 and the lower mold 2 with a rectangular plate structure are connected by a positioning pin 3, a core 4 is arranged between the upper mold 1 and the lower mold 2, a mounting plate 5 with a rectangular plate structure is arranged at the end of the lower mold 2, an injection head 6 corresponding to the core 4 is arranged on the mounting plate 5, rotating plugs 7 are arranged at positions corresponding to the ends of the core 4 on the upper mold 1 and the lower mold 2, the rotating plugs 7 are pressed onto the upper mold 1 and the lower mold 2 by the pressure plate 8, a rotating hole 9 is arranged in the center of the rotating plug 7, an eccentric port 10 is arranged on the edge, and vents 11 are arranged at positions corresponding to the eccentric port 10 on the upper mold 1 and the lower mold 2.

[0016] Example 2:

[0017] When the rubber injection mold involved in this embodiment is used:

[0018] First, the upper mold 1 and the lower mold 2 are positioned by the positioning pins 3 and fastened with bolts;

[0019] Then, the rotary plug 7 is pressed onto the upper mold 1 and the lower mold 2 respectively through the pressure plate 8;

[0020] Finally, the rubber material is injected into the space between the upper mold 1 and the lower mold 2 by the injection head 6 in a vertical injection manner, so that the rubber material forms the desired product 100;

[0021] During injection, the rubber material enters between the upper mold 1 and the lower mold 2 through the injection head 6 and flows from top to bottom, causing the air between the upper mold 1 and the lower mold 2 to flow downward and be discharged through the interconnected vent holes 11 and the eccentric opening 10. After the rubber material fills the gap between the upper mold 1 and the lower mold 2 and overflows 10% of the full volume, the rotary plug 7 is rotated through the rotary hole 9 to make the eccentric opening 10 deviate from the vent hole 11. The vent hole 11 is blocked by the rotary plug 7, and the pressure plate 8 is tightened and fixed to achieve the purpose of sealing. The rubber material is continuously injected through the injection head 6 to form pressure between the upper mold 1 and the lower mold 2 to ensure the density of the product 100.

[0022] After filling 200% of the volume with water, the ellipsoidal shape of the product 100 is uniform and has no deviation, which means that the wall thickness of each part of the prepared product 100 is consistent and the precision is high.

Claims

1. A rubber injection mold, the main structure of which includes an upper mold and a lower mold that are interlocked and connected, and a core arranged between the upper mold and the lower mold, characterized in that: The upper mold and the lower mold are provided with a rotating plug, the center of the rotating plug is provided with a rotating hole, the edge is provided with an eccentric port, the injection head and the core are on the same horizontal line, and the injection port is between the upper mold and the lower mold; During injection, the rubber enters between the upper mold and the lower mold through the injection head and flows from top to bottom, causing the air between the upper mold and the lower mold to flow downward and be discharged through the interconnected vent holes and eccentric ports. After the rubber fills the gap between the upper mold and the lower mold and overflows 10% of the full volume, the rotary plug is rotated through the rotary hole to make the eccentric port deviate from the vent hole. The vent hole is blocked with the rotary plug, the pressure plate is tightened and fixed, and the rubber is continued to be injected through the injection head to form pressure between the upper mold and the lower mold.

2. The rubber injection mold according to claim 1, characterized in that: The rotary plug is pressed onto the upper mold and the lower mold by a pressure plate.

3. The rubber injection mold according to claim 1 or 2, characterized in that: The end of the lower mold is also provided with a mounting plate, and an injection head is provided on the mounting plate.

4. The rubber injection mold according to claim 3, characterized in that: The upper mold and the lower mold are connected by locking pins.

5. The rubber injection mold according to claim 1 or 4, characterized in that: The upper mold and the lower mold are also provided with ventilation holes.

6. The rubber injection mold according to claim 3, characterized in that: The position of the injection head corresponds to the position of the core.

7. The rubber injection mold according to claim 6, characterized in that: The rotating hole does not penetrate the rotating plug, and the eccentric opening penetrates the rotating plug.

8. The rubber injection mold according to claim 7, characterized in that: The position of the vent hole corresponds to and is connected to the position of the eccentric opening.

9. The rubber injection mold according to claim 8, characterized in that: When in use, first, position the upper mold and the lower mold using the positioning pins and fasten them with bolts; Then, the rotary plugs are pressed onto the upper mold and the lower mold respectively through the pressing plate; Finally, the rubber material is injected into the space between the upper mold and the lower mold by the injection head using a vertical injection method, so that the rubber material is formed into the desired product.

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