JPH0344483Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a closed rubber kneading machine.
More specifically, the present invention relates to a closed rubber kneading machine such as an intermixer or a Banbury mixer. [Prior Art] Generally, rubber products are made by kneading a vulcanizing agent, a vulcanizing aid, a softening agent, an anti-aging agent, a coloring agent, a filler, etc. with a base rubber to create a rubber mixture. A rubber product is obtained by molding the rubber mixture into a predetermined shape and finally vulcanizing the molded product at high temperature. Here, the vulcanizing agent, vulcanizing aid, softening agent, anti-aging agent, coloring agent, filler, etc. that are blended into the base rubber are all powders consisting of fine particles. When a rubber mixture is kneaded using an open type roll with an open kneading section, powdered vulcanizing materials, vulcanization aids, softeners, anti-aging agents, colorants, fillers, etc. are significantly removed. This has the disadvantage that it scatters, making it impossible to maintain an accurate blending ratio and causing significant environmental pollution in the work room. For this reason, the kneading operation of the rubber mixture is generally carried out in a closed rubber kneading machine such as an intermixer or a Banbury mixer, in which the kneading section is in a closed state. This type of closed rubber kneading machine allows the base rubber, vulcanizate, and
Vulcanization aids, softeners, anti-aging agents, colorants, fillers, etc. are added, and then the mixture is pushed into the kneading chamber by a float installed in the hopper that can be raised and lowered, and the kneading chamber is sealed. In this state, the rubber mixture is kneaded by a pair of rubber kneading rotors, and after kneading, a drop door provided at the bottom is opened to discharge the rubber mixture to the outside of the machine. However, even if the rubber mixture is kneaded using such a closed-type rubber kneading machine, the rubber kneading factory will be contaminated with scattered vulcanizing agents, vulcanizing aids, anti-aging agents, colorants, fillers, etc. It is customary. This is because even in such a closed rubber kneading machine, the sealing is not complete. FIG. 1 is an explanatory longitudinal cross-sectional view of a kneading section showing a state in which a rubber mixture is kneaded using a conventional closed type rubber kneading machine. In FIG. 1, 1 is a pair of rubber kneading rotors rotating in opposite directions, 2 is a casing, 3 is a rubber mixture being kneaded, 4 is a float, and 5 is a cylinder rod. That is, the kneading section of the conventional closed type rubber kneading machine includes a box-shaped casing 2 that houses a pair of rotatable rubber kneading rotors 1 on the bottom side thereof, and a box-shaped casing 2 that is installed inside this casing 2 and that slides with the casing 2. It is equipped with a float 4, etc., which is movable and presses the rubber mixture 3 supplied onto the rubber kneading rotor 1 from above via a cylinder rod 5. In FIG. 1, the kneading chamber is formed by a casing 2 and a float 4. Further, since the float 4 is slidable relative to the casing 2, there is a slight gap in the sliding portion between the float 4 and the casing 2. In such a conventional closed-type rubber kneading machine, during rubber kneading work, the rubber mixture 3 is held down by the corot 4 and kneaded by rotating the pair of rubber kneading rotors 1. At this time, the float 4 is used to knead the rubber mixture 3. It fluctuates dramatically depending on the situation. As the float 4 violently moves up and down, the volume of the kneading chamber changes greatly. In Fig. 1, when the float 4 is lowered, the volume of the kneading chamber becomes smaller, and as a result, the internal pressure of the kneading chamber increases, and powder is ejected from the sliding surface between the casing 2 and the float 4 to the outside of the machine in the direction of the arrow. Otherwise, powder may adhere to the side wall of the casing 2. There is a problem in that the powder spewed out of the machine scatters inside the factory and causes significant pollution of the working environment. Further, it is necessary to stop the closed rubber kneading machine at regular intervals to scrape off the powder adhering to the side wall of the casing 2, which has the disadvantage of reducing work efficiency. Although it is conceivable to completely eliminate the gap between the float 4 and the casing 2, this would be impractical since the slidability would be significantly inferior. It is also conceivable to attach rubber packing to the inner circumferential surface of the casing 2 or the outer circumferential surface of the float 4, but rubber packing has the disadvantage of being easily damaged and is not practical. On the other hand, it is also conceivable to attach metal packing to the inner circumferential surface of the casing 2 or the outer circumferential surface of the float 4, but in this case, there is a problem that the sealing performance is deteriorated, which is also impractical. [Problems to be solved by the invention] The present invention has been made based on the above points, and its purpose is to eliminate the drawbacks of the prior art described above and improve the sliding surface between the casing and the float. An object of the present invention is to provide a closed type rubber kneading machine that can completely suppress the spouting of rubber powder and, as a result, prevent contamination of the working environment by the powder and completely prevent the powder from adhering to the side wall of the casing. . [Means for Solving the Problems] The gist of the present invention is to include a box-shaped casing that houses a pair of rotatable rubber kneading rotors on the bottom side, and a box-shaped casing that houses a pair of rotatable rubber kneading rotors on the bottom side, and a box-shaped casing that is installed inside the casing and that has an inner periphery of the casing. A closed type rubber kneading machine having a float that can move up and down while sliding on a surface to further press the rubber material supplied onto the rubber kneading rotor upward, is provided with a special sealing device on the side wall of the float. . That is, in the sealing device of the closed rubber kneading machine of the present invention, a seal casing having a cavity is installed in a continuous groove that is continuously opened along the outer periphery of the side wall of the float, and the inside of the cavity of the seal casing is installed. An air supply flange connected to high-pressure air piping from the back of the cavity, a rubber tube into which high-pressure air can be fed from the air supply flange, an intermediate flange that serves as an intermediate pushing member for the rubber tube, and The closed type rubber kneading machine is characterized in that a metal sealing material is built in so as to be successively adjacent to the intermediate flange, the rear end surface of which is in contact with the intermediate flange, and the front end surface of which is slightly protruding from the inner circumferential surface of the casing. [Function] The closed rubber kneading machine of the present invention is equipped with a special sealing device on the side wall of the float, that is, a seal casing having a cavity in a continuous groove that is continuously opened along the side wall of the float. An air supply flange, a rubber tube, an intermediate flange, and a metal sealing material connected to the high-pressure air piping are built into the cavity of the seal casing in order from the back, and the end surface of the metal sealing material is connected to the rubber tube. By providing a sealing device that slightly protrudes from the inner circumferential surface of the casing when pressed, the air bag pressure of the rubber tube inflated by high-pressure air is constantly transmitted to the metal sealing material through the intermediate flange. The sealing performance with the inner circumferential surface of the casing is always maintained to completely prevent powder from being ejected from the kneading chamber to the outside of the machine, and the lifting action of the float itself and the metal sealing material of the sealing device installed on the side wall of the float can be completely suppressed. By working synergistically with the scraping action, powder adhering to the inner circumferential surface of the casing can be effectively scraped off. Therefore, with the closed rubber kneading machine of the present invention, it is possible to completely prevent deterioration of the working environment, and also to significantly improve productivity by eliminating any downtime for cleaning the inner circumferential surface of the casing. [Example] Next, an example of the closed rubber kneading machine of the present invention will be described with reference to the drawings. 2 is a perspective explanatory view of the vicinity of a float in an embodiment of the closed rubber kneading machine of the present invention, and FIG. 3 is an explanatory enlarged cross-sectional view of the sealing device of FIG. 2. In Figures 2 and 3, 1 is a pair of rubber kneading rotors, 2 is a casing, 4a is a float, 5 is a cylinder rod, 6 is a sealing device, 7 is a seal casing, 8 is a metal sealing material, and 9 is a flange. ,
10 is a rubber tube, 11 is an intermediate flange, 12
is high pressure air, and 13 is high pressure air piping. As shown in FIG. 2, an embodiment of the closed rubber kneading machine of the present invention has a continuous groove opened on the sliding surface of the float 4a with the casing 2, that is, on the outer periphery of the side wall of the float 4a. Seal casing 7 inside
Attach. Inside the cavity of the seal casing 7 is an air supply flange 9 connected to a high-pressure air pipe 13 from the back side of the cavity, and a rubber tube through which high-pressure air 12 can be fed through the air supply flange 9. 10, an intermediate flange 11 and a metal sealing material 8 are built in so as to be adjacent to each other, and the end surface of the metal sealing material 8 is connected to a rubber tube 10.
Due to the pressure, it slightly protrudes from the inner circumferential surface of the casing 2. In the present invention, the rubber tube 10 is formed by inflating the rubber tube 10 by feeding high pressure air 12 from the high pressure air pipe 13 through the air supply flange 9.
The metal sealing material 8 comes into contact with the side wall of the casing 2 with a constant pressure due to the pressure of
The sealing property between the side wall of the casing 2 and the inner circumferential surface of the casing 2 is completely maintained, thereby completely preventing powder from being ejected from the kneading chamber. Furthermore, by completely preventing powder from blowing out from the kneading chamber, deterioration of the working environment can be completely prevented. In addition, the metal sealing material 8 of the sealing device 6 provided on the side wall of the float 4a effectively scrapes off powder adhering to the inner circumferential surface of the casing 2 when the float 4a moves up and down inside the casing 2. There is no need to stop the rubber kneading machine and clean the inner circumferential surface of the casing 2, and as a result, the efficiency of the rubber kneading operation can be significantly improved. In the present invention, it is appropriate to use brass, gunmetal, etc. with good wear resistance as the metal seal 8, but carbon products, graphite products, glass fiber products, epoxy products, phenol resin products, etc. can also be used. You can also do it. The sealing device 6 used in this invention is a rubber tube 1.
0. Since the seal casing 7 incorporating the metal seal material 8 and the like can be attached and detached, its attachment and replacement are easy. It goes without saying that the pressure inside the rubber tube 10 can be appropriately adjusted in consideration of sealing properties. [Effects of the invention] The closed rubber kneading machine of the present invention completely seals the sliding surface between the casing and the float with a sealing device attached to the outer peripheral surface of the side wall of the float, and prevents the powder from being mixed in the mixing chamber. It completely suppresses blowouts and completely prevents deterioration of the working environment, and furthermore, the lifting action of the float and the scraping action of the sealing device effectively scrape off powder adhering to the inner circumferential surface of the casing. It is industrially useful because it eliminates the need to clean the inside of the kneading machine.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional explanatory view of a kneading section showing a state in which a rubber mixture is kneaded by a conventional closed-type rubber kneading machine, and Fig. 2 shows a float in an embodiment of the closed-type rubber kneading machine of the present invention. FIG. 3 is an enlarged sectional view of the sealing device shown in FIG. 2; 1...Rubber kneading rotor, 2...Casing, 3...
...Rubber mixture, 4,4a...Float, 5...Cylinder rod, 6 ...Sealing device, 7...Seal casing, 8...Metal sealing material, 9...Flange, 10...Rubber tube, 11... ...Intermediate flange, 12...High pressure air, 13...High pressure air piping.

Claims (1)

[Scope of utility model registration request] A box-shaped casing housing a pair of rotatable rubber kneading rotors on the bottom side, and a rubber installed in the casing and raised and lowered while sliding on the inner peripheral surface of the casing to be supplied onto the rubber kneading rotors. In a closed rubber kneading machine having a float capable of pressing a material from above, a seal casing having a cavity in a continuous groove continuously opened along the outer periphery of the side wall is attached to the side wall of the float. can be,
Inside the cavity of the seal casing are an air supply flange connected to a high-pressure air pipe from the back side of the cavity, a rubber tube into which high-pressure air can be fed from the air supply flange, and an intermediate pushing member of the rubber tube. A sealing device is provided in which a metal sealing material is built into and adjacent to an intermediate flange whose rear end surface is in contact with the intermediate flange and whose distal end surface is slightly protruding from the inner circumferential surface of the casing. A closed type rubber kneading machine characterized by: