JPH02219783A - Opening/closing equipment for hopper discharge port - Google Patents

Abstract

PURPOSE:To close a discharge port assuredly without trouble even when an object to be fed is pinched, and at the same time, eliminate danger of damaging an opening/ closing valve by the object to be fed by internally installing an expansion valve, which opens or closes by the feeding of a fluid in the discharge port which is connected to the lower part of a hopper. CONSTITUTION:Since synthetic resin film cylinders 6, 6a contract, a sufficient clearance generates between a discharge port and the outer wall of an expansion/contraction valve, and an object to be fed in a hopper 1 is made to fall in order. After feeding a required quantity, a solenoid valve 11 is switched, and the synthetic resin film cylinders 6, 6a and a compressor 13 are communicated. The synthetic resin film cylinders 6, 6a, to which pressured air is fed by the compressor 13, expand and join to the side wall of the discharge port, and the clearance is closed. At this time, even if the object to be fed is pinched between the inner side wall of the discharge port and the synthetic resin film cylinders 6, 6a, the synthetic resin film cylinders 6, 6a deform along the object to be fed and join to the inner side wall of the discharge port. Therefore, by plugging of the discharge port, e.g expansion/contraction valve does not receive an excessive force, and there is no fear of generating a clearance at the discharge port.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to an opening/closing device for a hopper outlet of a supply device for powder, granules, liquid, etc., and an opening/closing device for a barrel polishing stone supply device. suitable as

(Prior Art) Conventionally, a device is known in which a rotary hopper is rotatably installed below a hopper, and the rotary hopper is rotated to supply a constant M from an opening (for example, Japanese Patent Publication No. 51-2703
No. 9). There is also known an opening/closing device for the hopper discharge port of a feeding device in which an opening/closing lid is provided below the hopper (for example, Japanese Utility Model Publication No. 37496/1983).

(Problems to be Solved by the Invention) However, when opening and closing the discharge port using a rotating hopper, if the material to be fed is small in the form of particles or spheres, jamming occurs between the rotating member and the fixed member, and the rotating hopper There was a problem that the rotation was impossible.

Further, in the structure provided with the opening/closing lid, there is a risk that the material to be supplied may be caught between the lid and the hopper outlet when the opening/closing lid is closed. However, if the hopper is caught, the opening/closing lid will not be sealed tightly, resulting in a problem that the material to be supplied in the hopper will spill out.

(Means for Solving the Problems) However, this invention uses an expansion valve that is deformed by liquid pressure to open and close the hopper outlet, so when closing the outlet, the expansion valve moves inside the hopper outlet. When the face is fully inflated to seal the face and the outlet is opened, the expansion valve is contracted to open the outlet with sufficient width, thus solving the problems of the prior art.

That is, the present invention is an opening/closing device for a hopper outlet, which is provided with an expansion and contraction valve that opens and closes by supplying and discharging fluid to the outlet of the hopper.

The expansion/contraction valve is a wear-resistant rubber film cylinder or synthetic resin film cylinder of a size capable of sealing the outlet of the hopper by expansion.

The fluid that expands or deflates the inflation/deflation valve is most preferably air, but other gases or fluids may also be used.

A pressurized fluid (for example, pressurized air) is used to expand the expansion valve in the above. In addition, for contraction, forced evacuation is performed using a vacuum pump, or natural evacuation is performed by opening the evacuation circuit to the outside world.

Although the forced evacuation can increase the speed, it requires a device such as a vacuum pump, and the natural evacuation is due to the falling pressure of the supplied material, which slows down the contraction speed of the expansion/contraction valve. Therefore, forced exhaust and natural exhaust are appropriately selected depending on the nature of the material to be handled, the shape of the exhaust port, etc.

Since the expansion/contraction valve described above seals the discharge port of the hopper with a considerably large contact area when expanded, there is no risk of impairing liquid tightness even if some of the discharged material is caught. Therefore, there is no risk of creating a gap through which the material in the hopper can pass. In addition, there is no risk that the expansion/contraction valve will be damaged due to jamming, that it will interfere with opening/closing, or that it will have an adverse effect on the material to be supplied (for example, pulverize the particles).

(Function) According to the present invention, by supplying fluid into the expansion valve, the expansion valve expands along the inner wall of the outlet of the hopper, thereby sealing the face. In addition, even if the material to be supplied is caught when the expansion/contraction valve expands, the outlet is reliably closed, and there is no adverse effect on the expansion instruction transmitting parts (such as the compressor). The expansion/deflation valve deforms and can automatically cope with it.

(Example) Embodiments of the invention will be described based on the drawings.

At the bottom of the hopper 1, an upper edge of a discharge tube 2.2a having a rectangular plane is connected to the upper edge of the discharge tube 2.2. Through-holes 3.3a are provided in the short side walls of each hole 3.3a, and when fitting the embolus 4.4a into each of the through-holes 3.3a, the embolus 4.4a is fitted to both ends of a wear-resistant synthetic resin film tube. wear it. A stay vibe 5 is inserted into the center of the synthetic resin film tube 6.6a, and both ends of the stay vibe 5 are fixed to one side of the embolus 4.4a, so that it is supported on both sides. Further, the embolus 4a is provided with a through hole 8, and an air supply/exhaust hose 7 is connected to the outer end of the through hole 8.

9 in the figure is the hopper lining (rubber or vinyl chloride);
10 is a separation plate, 14 is a set screw, and 15 is a stopper.

The synthetic resin film cylinder 6.6a is expandable or deformable, and can be made of a wear-resistant material such as urethane resin, vinyl chloride resin, rubber, or a commercially available fire hose (rubber lining, outer cloth).

Next, the opening/closing operation of the discharge port will be explained using the above embodiment.

First, it is assumed that the expansion valve is expanded and the discharge port is closed. At this time, in order to discharge the material to be supplied, the solenoid valve 11 is moved to the right in FIG. , the synthetic resin film tube 6.6a contracts as shown by the chain line 6'' in FIG. Drop them one after another.

Once the required amount has been supplied in this manner, the solenoid valve 11 is switched to the position shown in FIG.

The synthetic resin film cylinder 6.6a is connected to a compressor 13, and compressed air is supplied by the compressor 13'. The synthetic resin film cylinder 6.6a supplied with pressurized air in this manner expands and comes into close contact with the side wall of the outlet, thereby closing the face. At this time, even if the material to be supplied is sandwiched between the inner wall of the discharge port and the synthetic resin film tube 6.6a, the synthetic resin film tube 6.6a deforms along the material to be supplied, and the discharge port Since it is in close contact with the inner wall of the outlet, various parts (for example, the expansion and contraction valve) will not be subjected to excessive force due to blockage of the outlet, and there is no risk of creating a gap at the outlet.

(Effects of the Invention) In this invention, an expansion valve that opens and closes by supplying and discharging fluid is installed in the discharge port connected to the lower part of the hopper. There are various effects such as being able to close the valve reliably without any trouble, and eliminating the risk of damage to the on-off valve due to the supplied material.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view of an embodiment of the present invention, FIG. 2 is a partially cutaway bottom view, and FIG. 3 is a circuit diagram for instructing expansion and contraction of the valve. 1... Hopper 2.2a... Discharge tube 4.4a... Embolus 6.6a... Synthetic resin film tube 7... Supply/exhaust hose 12... Vacuum pump... Electric

Claims (1)

[Claims] 1. A hopper outlet opening/closing device provided with an expansion/contraction valve that opens and closes by supplying and discharging fluid to the hopper outlet 2. The expansion/contraction valve is made of a wear-resistant synthetic resin that can be expanded or contracted by fluid pressure. Hopper outlet opening/closing device 3 according to claim 1, wherein the hopper outlet opening/closing device according to claim 1, wherein the fluid pressure is air.