JPH07190211A - Control valve for particle - Google Patents

Abstract

PURPOSE:To prevent a packing and a ball from any damage as well as to prevent biting of particle therein and suppress quality deterioration of a formed molding article by providing, in an inflow part, a seal means wherein a seal part and a ball are separated from to each other during a cock opening period and they are brought in contact with each other during a cock closing period. CONSTITUTION:A disc holder 25 serving as an annular seal means is slidably fitted in parallel to the axis center of a flow hole 28a in a disc holder storage part 27 formed in annular shape around the flow hole 28a of an inflow part 28. The disc holder 25 is moved in the direction of a ball 24 by supplying air having a predetermined pressure in a space part 31 for pressing so that a packing 26 may be brought in contact with and prossed to the ball 24. Further, the disc holder 25 is moved in the direction opposite to that of the ball 24 by supplying the air having the predetermined pressure in a space part 32 for separation so that the packing 26 is separated from the ball 24 and a clearance is formed between the packing 26 and the ball 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a particle control valve for controlling the flow of a fluid having expandable thermoplastic resin particles or particles such as grains by an opening / closing operation. The present invention relates to a particle control valve capable of preventing damage to balls and packing caused by particles being caught in a packing.

[0002]

2. Description of the Related Art When a foamable thermoplastic resin particle is foamed in a mold and foam-molded to produce a foam-molded article, thermoplastic resin particles such as polystyrene, polyethylene and polypropylene are mixed with propane, butane, pentane, The expandable resin particles, which have been made foamable by containing a volatile foaming agent such as hexane, are pre-expanded by heating them with a heating medium such as steam to form pre-expanded particles, and then these pre-expanded particles are used in a molding die. Then, the foamed particles are secondarily foamed and simultaneously fused with each other to obtain a foam-molded article.

In each of the above-mentioned steps such as storage of expandable thermoplastic resin particles (hereinafter referred to as expandable resin particles) and production of expandable resin particles and pre-expanded particles, the foamed molded product is colored and the expansion ratio is increased. Since there are many different types, it is often carried out in a batch system that can process in a predetermined amount of units, and containers such as tanks that perform each process can be opened and closed according to the processing status of each process. It is designed to be connected via a control valve.

Conventionally, the above-mentioned particle control valve has, as shown in FIG. 5, a rotatable ball 61 formed in a spherical shape and a valve element 62 for accommodating the ball 61. The opening / closing operation of the control valve is opened by opening the through hole 61a formed in the ball 61 and the through holes 62a and 62a of the valve body 62 in the open state, while the through hole 61a and the through hole 62a are opened. -By shutting off 62a, it is closed. And the ball 61
The valve body 62 and the valve body 62 are in close contact with each other via packings 63, 63 provided at the peripheral portions of the both flow holes 62a, 62a,
The plugged state of the particle control valve is the above packing 63, 63.
It is supposed to be made sure.

[0005]

However, in the above-described conventional particle control valve, the ball 6 is rotated when the ball 61 is rotated.
There are cases where particles are caught between 1 and the packings 63, 63, and the particles are damaged and cause the packing 63, 63 and the ball 61 to be incomplete, thus making the closed state incomplete. When the plugged state of the particle control valve becomes incomplete, the individual steps of the particle control valve become continuous, which causes inconveniences such as gas leakage during processing in each step. Will be invited.

The particles whose flow is regulated by the particle control valve include resin particles such as the expandable resin particles described above, and additives such as a cell regulator, an antiblocking agent and a fusion accelerator, and a color pigment. Are added, and the addition amount and type of these additives and color pigments, or the color of the resin particles are made different depending on the type of foam-molded product. Therefore, the above-mentioned resin particles, additives, and color pigments are packed in the packing 6
If it is caught between 3.63 and the ball 61, the resin particles, additives, and color pigments before the switching will be mixed when the type of the foam molded product is switched, and the foam molded product will be mixed. Will be a factor that reduces the quality of.

As described above, in the conventional particle control valve, since the packings 63, 63 are always in close contact with the balls 61, the particles caught between the packings 63, 63 and the balls 61 can be easily removed. In addition, the entrapped particles cause problems such as damage to the packings 63 and 63 and the balls 61 and deterioration of the quality of the foam-molded product. Therefore,
In the present invention, by preventing the entrapment of particles,
It is an object of the present invention to provide a particle control valve capable of solving the above problems.

[0008]

In order to solve the above-mentioned problems, a particle control valve according to a first aspect of the present invention is provided with an inflow part into which particles flow in, a holding part for holding balls, and a holding part in the holding part. In a particle control valve having a valve body composed of an outflow part for letting out particles, a packing which is a sealing member that comes into contact with the ball to bring it into a closed state, and a ball capable of switching between an open state and a closed state The inflow portion is provided with a disk holder as a sealing means for separating the seal member and the ball from each other when the cap is opened and contacting the seal member and the ball when the cap is closed.

In order to solve the above-mentioned problems, a particle control valve according to a second aspect of the present invention has an inflow part into which particles flow in, a holding part for holding balls, and an outflow part for outflowing particles in the holding part. In a particle control valve having a valve body consisting of, a packing that is a seal member that comes into contact with the ball to put it in a closed state, and a ball that can switch between an open state and a closed state, The inflow part has a disc holder as a sealing means for separating the seal member and the ball from each other and abutting the seal member and the ball in the closed state, and a space part formed by the holding part and the ball. It is characterized by having a cleaning nozzle that ejects air when the cap is closed.

[0010]

According to the first and second aspects of the invention, the particle control valve can switch between the open state and the closed state by rotating the ball, and the closed state is the ball. This is done with a seal member that abuts this ball. At this time, the above-mentioned sealing member is designed to contact and separate from the ball by the sealing means, and the sealing means separates the sealing member and the ball from each other when the cap is opened, while it seals when the cap is closed. The member and the ball are brought into contact with each other.

Therefore, when the particle control valve is open,
A gap is formed between the seal member and the ball, and the particles that pass through the ball in the opened state also pass between the seal member and the ball. As a result, the particles are prevented from being caught between the seal member and the balls, and the seal member and the balls are prevented from being damaged by the particles.
Further, the particle control valve in which the particles are prevented from being caught can prevent the occurrence of defects due to the particles that are caught.

Further, in the case of the particle control valve according to the second aspect, the cleaning nozzle for ejecting the air when the cap is closed is provided in the space formed by the holding portion and the ball. Therefore, the particles that have entered and stayed in the above-mentioned space when the cap is opened are forcibly removed by the air ejected from the cleaning nozzle when the cap is closed. It becomes possible to prevent the occurrence of defects due to retention.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The following will describe one embodiment of the present invention with reference to FIGS.

The particle control valve according to the present embodiment controls the flow of, for example, expandable resin particles, particles such as grains, and a fluid having these particles by opening and closing operation. It is now used in pre-foaming systems for foaming.

As shown in FIG. 1, the above particle control valve has a ball 24 having a through hole 24a formed therein and a valve body 23 for rotatably accommodating the ball 24.
The valve body 23 includes an inflow part 28 on the inflow side of the expandable resin particles, a holding part 29 for holding the balls 24, and a holding part 2.
9 and an outflow portion 30 on the outflow side of the expandable resin particles. The surface of the ball 24 is preferably surface-treated in order to prevent the occurrence of scratches.

The inflow portion 28 is formed with a through hole 28a having a diameter corresponding to the inner diameter of the pipe to be connected, and a flange portion 28b is provided on the outer peripheral portion so as to project. 28b ensures the connection between the pipe and the particle control valve. Further, in the inflow portion 28, a disc holder accommodating portion 27 is formed in an annular shape around the circulation hole 28a, and in the disc holder accommodating portion 27, the disc holder 2 which is an annular sealing means.
5 is slidably fitted in parallel with the axis of the flow hole 28a.

The disk holder 25 holds a packing 26, which is an annular seal member, and the packing 26 contacts the ball 24 so that the flow hole 28a is blocked. Further, the disc holder accommodating portion 27 and the disc holder 25 form a pressing space portion 31 between the upper surfaces in the drawing, which are farthest from the ball 24, and the inflow portion 28 has a position of the pressing space portion 31. The air supply hole 27a is formed so as to correspond to. Then, the disc holder 25 is moved in the direction of the ball 24 to move the packing 26 to the ball 2 by supplying air of a predetermined pressure to the pressing space portion 31 through the air supply hole 27a.
4, and the packing 26 is pressed against the ball 24.

The predetermined pressure of the air supplied from the air supply hole 27b means that the pressure of the pocket portion 34, which is a gap formed between the holding portion 29 and the ball 24, is greater than the pressure of the flow hole 28a of the inflow portion 28. Is also high, the pressure is such that the contact between the packing 26 and the ball 24 is not released due to the pressure difference between the pocket 34 and the flow hole 28a.

On the other hand, the disc holder accommodating portion 27 and the disc holder 25 form a separating space portion 32 between the lower surfaces close to the ball 24, and the inflow portion 28 is located at the position of the separating space portion 32. The air supply holes 27b are formed so as to coincide with each other. Then, the disk holder 25 is moved in the direction opposite to the ball 24 direction to separate the packing 26 from the ball 24 by supplying air of a predetermined pressure to the separating space 32 through the air supply hole 27b. Packing 26
A gap is formed between the ball and the ball.

Two cleaning nozzles 33 are arranged between the inflow portion 28 and the holding portion 29. These cleaning nozzles 33, 33 are adapted to eject air into the pocket portion 34 formed by the ball 24 and the holding portion 29. And the above cleaning nozzle 3
The operation of ejecting air by 3.33 is performed every time air is supplied to the pressing space portion 31 to bring the packing 26 and the ball 24 into contact with each other.

Incidentally, the cleaning nozzles 33, 33 have the above-mentioned 2
The location is not limited to one, and may be provided at three or more locations. Further, if the expandable resin particles and the like accumulated in the pocket 34 can be sufficiently removed, the number of locations is one. May be.

The holding portion 29 forming the pocket portion 34 to be cleaned by the cleaning nozzles 33, 33 is a ball 24.
It has a pair of rotating shafts 35 and 36 for holding. These rotating shafts 35 and 36 are rotatably provided so that their axes are orthogonal to the axis of the flow hole 28a.
5.36 are fixed to both ends of the ball 24 with their axes aligned.

An air cylinder 37, which is reciprocally rotatable at an angle of 90 °, is provided on one of the rotary shafts 36 through a joint 38. The air cylinder 37 is connected to the joint 38 and a rotary shaft. The ball 24 can be rotated at an angle of 90 ° via the moving shaft 36. Thereby, the through hole 24a of the ball 24 and the through hole 28a of the inflow portion 28 are
Since the communication state and the cutoff state are switched, the particle control valve is set to the open state in the communication state and the closed state in the cutoff state.

A joint member 39 connecting the air cylinder 37 and the rotary shaft 36 is provided with an abutting member 39 as shown in FIG. The contact member 39 can contact the switch portion 40a of the air limit 40 when the particle control valve is closed.
Controls the air supplied to the above-mentioned air supply holes 27a and 27b.

That is, as shown in FIG. 3, when the particle control valve is in the closed state, the contact member 39 of FIG. 2 contacts the switch portion 40a, and the air limit 40 supplies the air supply of FIG. Air is supplied to the pressing space portion 31 through the hole 27a, and the separation space portion 32 is opened. On the other hand, when the particle control valve is opened as shown in FIG. 4, the contact member 39 of FIG.
Air is supplied to the separating space portion 32 through the air supply hole 27b, and the pressing space portion 31 is opened.

Next, as shown in FIG. 1, a flow hole 30a is formed in the outflow portion 30 on the side where the expandable resin particles and the like flow out when the particle control valve is opened. The circulation hole 30a is formed so as to prevent contact with the ball 24, and a gap is formed between the circulation hole 30a and the ball 24 from the upper portion to the lower portion. The flow hole 30a forms a space that is continuous with the pocket 34 described above. Further, the wall surfaces of the flow hole 30a and the holding portion 29 forming the pocket portion 34 are coated with a surface treatment agent such as Teflon to be subjected to low friction treatment. It is designed to facilitate discharge. The low-friction treatment described above is not limited to the surface treatment agent, and may be mirror-finished.

In this way, the particle control valve of this embodiment is
By moving the packing 26 with the disk holder 25, the positional relationship between the packing 26 and the balls 24 can be changed. Therefore, the expandable resin particles are prevented from being caught between the packing 26 and the balls 24, and the packing 26 and the balls 24 are prevented from being damaged by the caught expandable resin particles. Become. Furthermore, the prevention of the above biting also prevents the particles of the expandable resin particles and the additives and color pigments mixed in the expandable resin particles from remaining, which occurs when the particles are switched. It is possible to prevent deterioration of the quality of the foamed molded product.

In this embodiment, the particle control valve is used in the pre-foaming system, but the present invention is not limited to this. That is, it may be used, for example, as a control valve that regulates the amount of charge to a foam molding machine, and can be used in all devices that process particles.

[0029]

The particle control valve according to the first aspect of the present invention comprises:
As described above, the inflow section is provided with the sealing means that separates the seal member and the ball from each other when the cap is opened and contacts the seal member and the ball when the cap is closed.

As a result, when the particle control valve is opened, the fluid is passed between the seal member and the ball by forming a gap between the seal member and the ball by the sealing means. It is possible to prevent the particles of the fluid from being caught between the seal member and the ball. The prevention of the biting has an effect that it is possible to prevent the damage of the seal member and the ball and also to prevent the generation of the defect due to the particles that are bitten.

In the particle control valve according to the second aspect of the present invention, as described above, the seal that separates the seal member and the ball from each other when the cap is opened and the seal member that contacts the ball when the cap is closed. In addition to having the means in the inflow part, it has a cleaning nozzle for ejecting air into the space formed by the holding part and the ball when the cap is closed.

Accordingly, when the particle control valve is in the open state, the fluid is allowed to pass between the seal member and the ball by forming a gap between the seal member and the ball by the sealing means, It is possible to prevent the particles of the fluid from being caught between the seal member and the ball. The prevention of the entrapment makes it possible to prevent the seal member and the balls from being damaged, and prevent the generation of defects due to the entrapped particles.

Furthermore, by forcibly removing the particles that have entered and stayed in the above-mentioned space when the cap is opened with the air ejected from the cleaning nozzle when the cap is closed, the occurrence of defects due to the retention of particles is prevented. There is an effect that it becomes possible to do.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a particle control valve according to an embodiment of the present invention as viewed from the front direction.

FIG. 2 is a side view showing half of the particle control valve omitted.

FIG. 3 is an explanatory view showing a closed state of the particle control valve.

FIG. 4 is an explanatory view showing an open state of the particle control valve.

FIG. 5 is a vertical cross-sectional view of a conventional particle control valve.

[Explanation of symbols]

 23 valve body 24 ball 25 disc holder (sealing means) 26 packing (sealing member) 27 disc holder accommodating portion 28 inflow portion 29 holding portion 30 outflow portion 31 pressing space portion 32 separating space portion 33 cleaning nozzle 34 pocket portion 35・ 36 Rotating shaft 37 Air cylinder 39 Contact member 40 Air limit

Claims (2)

[Claims] 1. A valve member comprising an inflow part through which particles flow in, a holding part for holding a ball, and an outflow part through which particles in the holding part flow out, and a sealing member which abuts on the ball and closes it. And a ball capable of switching between an open state and a closed state, in a particle control valve, the seal member and the ball are separated from each other in the open state, while the seal member and the ball are in contact with each other in the closed state. A particle control valve, characterized in that it has a sealing means for causing it to flow in. 2. A valve member comprising an inflow part through which particles flow in, a holding part for holding a ball, and an outflow part through which particles in the holding part flow out, and a sealing member which abuts on the ball and closes it. And a ball capable of switching between an open state and a closed state, in a particle control valve, the seal member and the ball are separated from each other in the open state, while the seal member and the ball are in contact with each other in the closed state. A particle control valve, comprising: a sealing means for causing the inflow portion, and a cleaning nozzle for ejecting air into a space formed by a holding portion and a ball in a closed state.