JP4582625B2 - Rubber mixing ratio switching device and rubber extruder - Google Patents

Description

  The present invention relates to a rubber mixing ratio switching device that enables mixing and non-mixing of a plurality of types of rubber, and a rubber extruder provided with the same.

  Conventionally, as an apparatus that enables mixing and non-mixing of a plurality of types of rubber, as shown in FIG. 5, an opening / closing valve 14A is provided in the rubber transport pipes 11 and 12 that form different types of rubber A and B flow paths. , 14B and merge at the downstream end to form one rubber transport pipe 13. Then, by controlling the opening / closing of the opening / closing valves 14A, 14B, the type of rubber flowing through the rubber transport pipe 13 is either A only, B only, or a mixture of A and B (hereinafter referred to as A + B). Set.

  However, since this conventional device requires an open / close valve for each type of rubber, the larger the number of rubber types, the more open / close valves are required and the installation space is also required. To do.

  In view of this, Patent Document 1 discloses an apparatus that enables mixing and non-mixing of a plurality of types of rubber with a single on-off valve. As shown in FIG. 6, the rubber extruder 21 has hopper ports 22A and 22B for supplying rubbers A and B, and screws 23A for plasticizing the rubbers A and B supplied to the hopper ports 22A and 22B. 23B and a gate valve 24 that mixes the plasticized rubbers A and B while changing the mixing ratio.

  The gate valve 24 has a cylinder 27, and chambers 29A and 29B are provided in the lower part of the cylinder 27 by a partition plate 28 so that the rubbers A and B are allowed to pass therethrough. Are provided with a rotary valve body 26 for controlling the opening areas of the respective flow paths 25A and 25B. By rotating the rotary valve body 26 around the central axis of the cylinder 27 with a drive motor or the like (not shown), rubber A, These mixing ratios can be changed steplessly while keeping the total amount of B constant. The rubbers A and B merge at the outlets of the flow paths 25A and 25B, and are mixed while passing through the flow path 31 that is attached to the rotary valve body 26 and restricted by the plurality of baffle plates 32, and exits from the gate valve 24. Then, it is led to a base (not shown) which becomes an outlet of the ribbon-like rubber.

Here, the space surrounded by the inner peripheral surface of the cylinder 27 and the rotary valve body 26 constitutes a mixing portion that mixes the plasticized rubbers A and B. Further, the mixing ratio can be controlled by controlling the rotation angle of the rotary valve element 26, and one of the flow paths 25A or 25B can be completely closed by rotating to the limit of the movable range.
Japanese Patent Application Laid-Open No. 2004-216725 (FIG. 3)

  However, in the gate valve 24 described in Patent Document 1, since the chambers 29A and 29B through which the rubbers A and B are individually passed by the partition plate 28 are provided, the configuration is complicated, the number of parts is large, and There was a problem that the volume of the cylinder 27 increased.

  The present invention has been made to solve such problems, and its purpose is to realize a simplification of a mechanism for mixing and non-mixing a plurality of types of rubber, a reduction in the number of parts, and a reduction in size. That is.

The invention according to claim 1 is a cylinder in which a plurality of rubber inlets and rubber outlets for introducing different types of rubber are arranged at different circumferential positions on the outer peripheral surface, and a central axis of the cylinder in the cylinder The rotary valve extends in the direction and rotates around the central axis of the cylinder, and the rotary valve faces the same space partitioned by the inner surface of the cylinder and the rotary valve according to the rotation angle. Changing the combination of the rubber introduction port with respect to the rubber outlet, and setting the rubber outlet and the rubber inlet facing the same space to the fully open state for all of the combinations, and the rotary valve is separated from the central axis The rubber inlet and the rubber outlet are opposed to a space partitioned by the inner surface of the cylinder and the surface on the central axis side of the rotary valve, and the rotary valve A cylinder inscribed in the Linda has a shape cut from a plane parallel to the central axis and separated from the central axis, and the distance from the central axis of the cylinder to the plane of the rotary valve is the rubber introduction port and the rubber guide. a rubber mixing ratio changing device according to claim radius than der Rukoto outlets.
The invention according to claim 2 is a cylinder in which a plurality of rubber inlets and rubber outlets for introducing different types of rubber are arranged at different circumferential positions on the outer peripheral surface, and the center of the cylinder in the cylinder. The rotary valve extends in the axial direction and rotates around the central axis of the cylinder. The rotary valve is arranged in the same space partitioned by the inner surface of the cylinder and the rotary valve according to the rotation angle. The combination of the rubber introduction port with respect to the opposed rubber outlet port is changed, the rubber outlet port and the rubber inlet port facing the same space are fully opened for all the combinations, and the rotary valve is separated from the central axis. The rubber inlet and the rubber outlet are opposed to a space partitioned by the inner surface of the cylinder and the surface on the central axis side of the rotary valve. A cylinder inscribed in a cylinder has a shape that is sliced by two planes that are separated from the central axis and are close to each other and parallel to the central axis, and of the two planes of the rotary valve from the central axis of the cylinder, The rubber mixing ratio switching device is characterized in that the distance to the plane closer to the central axis is equal to or greater than the radius of the rubber inlet and the rubber outlet .
According to a third aspect of the present invention, in the rubber mixing ratio switching device according to the first or second aspect, the two rubber introduction ports are arranged to face each other, and the rubber outlet port is located between the two rubber introduction ports. it is located in a rubber mixing ratio changing device according to claim Rukoto.
According to a fourth aspect of the present invention, there is provided a rubber mixing ratio switching device according to any one of the first to third aspects, a plurality of rubber plasticizing means for plasticizing different types of rubber, and plasticizing by the rubber plasticizing means. a rubber extruder, characterized in that the reduction rubber and means for supplying to the rubber inlet of the rubber mixing ratio switching device.

According to the present invention, a plurality of rubber inlets and rubber outlets are disposed on the outer peripheral surface (side surface) of the cylinder, and a rotary valve that rotates about the central axis of the cylinder is provided in the cylinder. By changing the combination of the rubber inlet with the rubber outlet facing the same space partitioned by the cylinder and the rotary valve according to the rotation angle, the introduced rubber is mixed or not mixed. Therefore, it is not necessary to provide a chamber through which a plurality of types of rubbers individually pass and a partition plate therefor, so that the apparatus configuration can be simplified and miniaturized, and the number of parts can be reduced. In addition, the rubber outlet and the rubber inlet facing the same space are fully opened for all combinations of the rubber outlet and the rubber inlet, so that the rubber flow is not obstructed by the rotary valve and smoothly flows into the cylinder. And is led out of the cylinder.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
FIG. 1 is a view for explaining a configuration of a rubber mixing ratio switching device according to a first embodiment of the present invention, and FIG. 2 is a perspective view of a rotary valve in FIG. In this embodiment, two types of rubbers A and B are introduced, and A + B is derived (FIG. 1 (a)), only A is derived (FIG. 1 (b)), and only B is derived (FIG. 1 (c)). Is made possible.

  As shown in FIG. 1, the rubber mixing ratio switching device according to this embodiment includes a housing 1, a cylinder 2 disposed in the housing 1, and a rubber introduction tube for introducing rubber A into the cylinder 2. 3, a rubber introduction pipe 4 for introducing the rubber B into the cylinder 2, and a rubber outlet pipe 5 for leading out the rubber A, rubber B, or rubber A + B. The rubber introduction pipes 3 and 4 are connected to the opposite positions of the cylinder 2, that is, at the same height in the direction of the central axis P of the cylinder 2 and at positions 180 ° apart in the circumferential direction of the outer peripheral surface. Further, the rubber outlet pipe 5 is connected to a middle position between the rubber introduction pipes 3 and 4, that is, at the same height in the central axis direction of the cylinder 2 and at a position 90 ° apart in the circumferential direction of the outer peripheral surface.

  Openings 3a and 4a on the upstream side of the rubber introduction pipes 3 and 4 are exposed on the front surface of the housing 1 (described at the lower end in FIG. 1), and downstream of the rubber outlet tube 5 on the rear surface of the housing 1. The side opening 5a is exposed. Further, the downstream ends of the rubber introduction pipes 3 and 4 are connected to the side surface (outer peripheral surface) of the cylinder 2 and communicated with the inside of the cylinder 2, and openings 3 b and 4 b are formed at the connection portions. Furthermore, the upstream end of the rubber outlet pipe 5 is connected to the side surface of the cylinder 2 and communicates with the inside of the cylinder 2, and an opening 5 b is formed at the connecting portion. The rubber introduction pipes 3 and 4 and the rubber outlet pipe 5 are circular with the same cross section. The rubber mixing ratio switching device according to this embodiment is one of the devices constituting a rubber extruder similar to that shown in FIG. 5, and the hoppers shown in FIG. Devices similar to the ports 22A and 22B and the screws 23A and 23B are connected.

  A rotary valve 6 that can rotate around the central axis P of the cylinder 2 is disposed in the cylinder 2. As shown in FIGS. 1 and 2, the rotary valve 6 has a shape in which a cylinder inscribed in the cylinder 2 is cut from a plane parallel to the central axis P and separated from the central axis P of the cylinder 2. In addition, disks 7 and 8 for rotating the rotary valve 6 by a rotating means (not shown) are provided at the lower ends, and rotating shafts 9 and 10 are attached to the centers of the disks 7 and 8. Here, the distance from the central axis P of the cylinder 2 (= the center of the rotary shafts 9 and 10) to the plane 6a of the rotary valve 6 may be set to be equal to or greater than the radius of the rubber introduction pipes 3 and 4 and the rubber outlet pipe 5. However, here it was set to the same value as the radius. The disks 7 and 8 are provided at the upper end and the lower end in the cylinder 2 so as to be inscribed in the cylinder 2.

  Next, the operation of the rubber mixing ratio switching device having the above configuration will be described in the order of deriving rubber A + B, deriving only rubber A, and deriving only rubber B.

When the rubber A + B is derived, the rotary valve 6 is stopped at an angle shown in FIG. The rubbers A and B enter the pipes through the openings 3a and 4a of the rubber introduction pipes 3 and 4, respectively, and are introduced into the cylinder 2 through the openings 3b and 4b. At this time, since the distance from the center axis P of the cylinder 2 to the plane 6a of the rotary valve 6 and the radius of the rubber introduction pipes 3 and 4 are the same, the side end in the clockwise direction of the rotary valve 6 and the rubber introduction pipe 3 The position of the opening 3b in the counterclockwise direction is the same, and the position of the counterclockwise side end of the rotary valve 6 is the same as the position of the opening 4b of the rubber introduction pipe 4 in the clockwise direction. As a result, the opening 3b and the opening 4b are fully opened . For this reason, the flows of the rubbers A and B are smoothly introduced into the cylinder 2 without being blocked by the rotary valve 6. The rubbers A and B introduced into the cylinder 2 are mixed by colliding with each other and pushed out from the rubber outlet pipe 5.

When only the rubber A is derived, as shown in FIG. 1B, the rotary valve 6 is stopped at an angle rotated 90 ° counterclockwise from FIG. The rubber A enters the pipe through the opening 3 a of the rubber introduction pipe 3 and is introduced into the cylinder 2 through the opening 3 b, but the rubber B has an opening 4 b of the rubber introduction pipe 4 formed by the outer peripheral surface of the rotary valve 6. Since it is closed, it is not introduced into the cylinder 2. The rubber A introduced into the cylinder 2 is pushed out from the rubber outlet pipe 5. At this time, since the distance from the central axis P of the cylinder 2 to the plane 6a of the rotary valve 6 and the radius of the rubber outlet pipe 5 are the same, the counterclockwise end of the rotary valve 6 and the opening of the rubber outlet pipe 5 are the same. Since the position of the part 5b with the end in the clockwise direction is the same , the opening 5b is fully opened . For this reason, the flow of the rubber A is smoothly led out of the cylinder 2 without being obstructed by the rotary valve 6.

When only the rubber B is derived, as shown in FIG. 1 (c), the rotary valve 6 is stopped at an angle rotated 90 ° clockwise from FIG. 1 (a). The rubber B enters the pipe through the opening 4 a of the rubber introduction pipe 4 and is introduced into the cylinder 2 through the opening 4 b, but the rubber A has an opening 3 b of the rubber introduction pipe 3 formed by the outer peripheral surface of the rotary valve 6. Since it is closed, it is not introduced into the cylinder 2. The rubber B introduced into the cylinder 2 is pushed out from the rubber outlet pipe 5. At this time, since the distance from the central axis P of the cylinder 2 to the plane 6a of the rotary valve 6 and the radius of the rubber outlet pipe 5 are the same, the clockwise end of the rotary valve 6 and the opening of the rubber outlet pipe 5 are the same. Since the position of the end 5b in the counterclockwise direction is the same , the opening 5b is fully opened . For this reason, the flow of the rubber B is smoothly led out of the cylinder 2 without being obstructed by the rotary valve 6.

  As the rotary valve, the shape of the rotary valve 6 'in FIG. 3, that is, the cylinder inscribed in the cylinder 2 is sliced by two planes that are separated from the central axis P of the cylinder 2 and are parallel to the central axis and close to each other. Also good. This shape can also be said to have shaved the outer peripheral surface side of the rotary valve 6. Further, it is possible to deform the connection positions of the rubber introduction pipes 3 and 4 and the rubber outlet pipe 5 with respect to the cylinder 2 and increase the number of types of rubber to be mixed.

[Second Embodiment]
FIG. 4 is a view for explaining the configuration of the rubber mixing ratio switching device according to the second embodiment of the present invention. Here, FIG. 4A is a cross-sectional view in the central axis direction of the cylinder, and FIG. 4B is a cross-sectional view in the XX direction in FIG. In FIG. 4, the components corresponding to those in FIG.

  In the present embodiment, the rubber inlets 3 and 4 and the rubber outlet 5 are arranged in a line on a line parallel to the central axis on the outer peripheral surface of the cylinder 2. The rotary valve 6 arranged in the cylinder 2 includes a rotary shaft 6c and valve bodies 6d and 6e arranged on the outer peripheral surface of the rotary shaft 6c. The valve bodies 6d and 6e are attached to rotational positions that are 180 ° different from each other at axial positions corresponding to the rubber inlets 3 and 4 and the openings 3b and 4b, respectively. Further, the valve bodies 6d and 6e are (1) the valve body 6d closes the opening 3b of the rubber introduction port 3 and the valve body 6e is the opening 4b of the rubber introduction port 4 according to the rotation angle of the rotation shaft 6c. Or (2) the valve body 6d opens the opening 3b of the rubber introduction port 3, and the valve body 6e closes the opening 4b of the rubber introduction port 4, or (3) the valve body 6d The opening 3b of the rubber inlet 3 is opened, and the valve body 6e is in one of the states of opening the opening 4b of the rubber inlet 4 (FIG. 4 shows the state (1)).

  Next, the operation of the rubber mixing ratio switching device having the above configuration will be described in the order of deriving only rubber B, deriving only rubber A, and deriving A + B.

  When only the rubber B is derived, the rotary valve 6 is stopped at an angle shown in FIG. The rubber B enters the pipe through the opening 4 a of the rubber introduction pipe 4 and is introduced into the cylinder 2 through the opening 4 b, but the rubber A is the valve body 6 d of the rotary valve 6 at the opening 3 b of the rubber introduction pipe 3. Since it is closed by the outer peripheral surface, it is not introduced into the cylinder 2. The rubber B introduced into the cylinder 2 is pushed out from the rubber outlet pipe 5.

  When only rubber A is derived, the rotary valve 6 is stopped at an angle rotated by 180 ° from the angle shown in FIG. The rubber A enters the pipe through the opening 3a of the rubber introduction pipe 3, and is introduced into the cylinder 2 through the opening 3b. Since it is closed by the outer peripheral surface, it is not introduced into the cylinder 2. The rubber A introduced into the cylinder 2 is pushed out from the rubber outlet pipe 5.

  When the rubber A + B is derived, the rotary valve 6 is stopped at an angle rotated by 90 ° from the angle shown in FIG. The rubber A enters the tube through the opening 3a of the rubber introduction tube 3, is introduced into the cylinder 2 through the opening 3b, and the rubber B enters the tube through the opening 4a of the rubber introduction tube 4, and enters the cylinder 2 through the opening 4b. To be introduced. The rubbers A and B introduced into the cylinder 2 are mixed and pushed out from the rubber outlet pipe 5.

It is a figure for demonstrating the structure of the rubber mixing ratio switching apparatus which concerns on the 1st Embodiment of this invention. It is a perspective view of the rotary valve in the 1st Embodiment of this invention. It is a perspective view of the modification of the rotary valve in the 1st Embodiment of this invention. It is a figure for demonstrating the structure of the rubber mixing ratio switching apparatus which concerns on the 2nd Embodiment of this invention. It is a figure which shows the structure of the conventional apparatus which enables mixing and non-mixing of multiple types of rubber. It is a figure which shows the structure of the conventional apparatus which enables mixing and non-mixing of multiple types of rubber | gum by one on-off valve.

Explanation of symbols

  2 ... cylinder, 3, 4 ... rubber inlet tube, 5 ... rubber outlet tube, 6, 6 '... rotary valve.

Claims (4)

A cylinder in which a plurality of rubber inlets and rubber outlets for introducing different types of rubber are arranged at different circumferential positions on the outer peripheral surface, and the cylinder extends in the central axis direction of the cylinder in the cylinder. A rotary valve that rotates around the central axis of the
The rotary valve changes the combination of the rubber introduction port with respect to the rubber outlet port facing the same space partitioned by the inner surface of the cylinder and the rotary valve according to the rotation angle, and all of the combinations The rubber outlet and the rubber inlet facing the same space are fully opened ,
The rotary valve is disposed at a position away from the central axis, and the rubber inlet and the rubber outlet are opposed to a space partitioned by the inner surface of the cylinder and the central axis side surface of the rotary valve,
The rotary valve has a shape obtained by cutting a cylinder inscribed in the cylinder away from the central axis and cut in a plane parallel to the central axis,
Rubber mixing ratio switching device, wherein a distance from the central axis up to the plane of the rotary valve of the cylinder is Ru der radius over the rubber inlet and rubber outlet. A plurality of rubber inlets and rubber outlets for introducing different types of rubber, respectively, are arranged at different circumferential positions on the outer peripheral surface, and are extended in the central axis direction of the cylinder in the cylinder, Equipped with a rotary valve that rotates around the central axis of the cylinder,
The rotary valve changes the combination of the rubber introduction port with respect to the rubber outlet port facing the same space partitioned by the inner surface of the cylinder and the rotary valve according to the rotation angle, and all the combinations The rubber outlet and the rubber inlet facing the same space are fully opened,
The rotary valve is disposed at a position away from the central axis, and the rubber inlet and the rubber outlet are opposed to a space partitioned by the inner surface of the cylinder and the central axis side surface of the rotary valve,
The rotary valve has a shape in which a cylinder inscribed in the cylinder is sliced by two planes that are separated from the central axis and are close to each other parallel to the central axis.
A rubber mixing ratio switching characterized in that a distance from a central axis of the cylinder to a plane closer to the central axis among the two planes of the rotary valve is equal to or greater than the radius of the rubber inlet and the rubber outlet. apparatus. In the rubber mixing ratio switching device according to claim 1 or 2,
Two of the rubber inlet is arranged to face the rubber mixing ratio changing device in which the rubber outlet is characterized that you have been placed in the middle of the two rubber inlet. The rubber mixing ratio switching device according to any one of claims 1 to 3 , a plurality of rubber plasticizing means for plasticizing different types of rubber, and the rubber plasticized by the rubber plasticizing means A rubber extruder characterized by comprising means for supplying to the rubber inlet of the ratio switching device .

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