JPS5916354Y2 - Powder supply port shutoff and sealing device - Google Patents

Description

[Detailed Description of the Invention] The present invention includes, for example, connecting a powder supply device via a connecting pipe to a pressure vessel that sends powder such as foundry sand to a supply destination by pneumatic transportation, etc., and supplying the powder. The present invention relates to a shutoff and sealing device for a powder supply port that shuts off the lower end of the connecting pipe in a device that supplies powder stored in an apparatus into the pressure vessel.

Conventionally, it has been used as a shutoff and sealing device to cut off the supply of powder and granular materials such as foundry sand supplied from a hopper into a pressure vessel, and to prevent compressed air supplied into the pressure vessel from flowing back into the hopper. In this method, a shutoff means for shutting off the supply of powder and granular material and a sealing means for preventing compressed air from flowing back into the hopper are provided separately. The method is either to prevent backflow, or to use a powder blocking means to also serve as a sealing means to prevent backflow of compressed air.

In the former, there are problems such as the need to install two separate devices, which makes the device expensive and complicated, and in the latter, there are problems such as compressed air inside the pressure vessel flowing back into the hopper. was there.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a shutoff and sealing device for a powder supply port that is capable of reliably shutting off powder and preventing backflow of compressed air.

An embodiment of the present invention will be described below with reference to the drawings.

Reference numeral 1 designates a pressure vessel for pneumatic transportation of, for example, foundry sand, which is provided with a supply port 3 having a flange portion 2 protruding from the outer periphery of the upper end, and 4 has a stepped flange portion 5 fixed to the outer periphery of the lower end opening 4a. The flange portion 5 of the connecting tube is connected to the flange portion 2 of the pressure vessel 1 by screws through a backing 6, so that the pressure vessel 1 and the connecting tube 4 can communicate with each other.

Reference numerals 7 and 8 denote two annular stepped portions provided on the inner peripheral portion of the lower surface of the flange portion 5 so as to be concentric with the connecting pipe 4. The lower end portion of 4 protrudes downward by a predetermined length, and the stepped portion 8 located below is set to have a larger diameter than the stepped portion 7, and an annular fitting groove 9 is formed on the outer periphery of the upper surface thereof. An annular seal member 10 is fitted into the fitting groove 9.

Reference numeral 11 denotes an on-off valve in which a flexible elastic member 13 is attached to the upper surface of a truncated cone-shaped base plate 12 whose outer periphery is tapered downward and can be brought into close contact with the sealing member 10. A connecting rod 14 is provided upright.

Reference numeral 15 denotes a link whose intermediate portion is rotatably supported by a support member 16 protruding from the outer circumferential wall of the connecting pipe 4. The upper end of the connecting rod 14 is rotatably supported at one end of the link. A piston rod 17 of an air cylinder is rotatably supported at the other end, and the opening/closing valve 11 is moved up and down by the expansion and contraction of the piston rod 17 of the air cylinder.

18 is an annular flange fixed to the outer periphery of the upper end of the connecting pipe 4, and 19 is an annular flange 2 fixed to the outer periphery of the lower end opening.
In this hopper chute as a powder supply device, the flange portion 18 is screwed and fixed to the flange portion 20 via a backing 21, so that the hopper chute 19 and the connecting pipe 4 are communicated with each other. .

Next, the operation of this embodiment configured as above will be explained.

First, the piston rod 17 of the air cylinder is pushed out and the on-off valve 11 is lowered to the position shown by the dashed line in the drawing to open the lower end opening 4a of the connecting pipe 4, and the powder stored in the hopper chute 19 is removed. For example, when a certain amount of granular material such as foundry sand is supplied into the pressure vessel 1, a level switch (not shown) installed in the pressure vessel 1 is activated, and the detection signal causes the piston rod 17 of the air cylinder to move. Retraction is activated.

Then, the link 15 is rotated clockwise and the connecting rod 14
The opening/closing valve 11 is moved upward through the opening and closing valve 11, and the lower end opening 4a of the connecting pipe 4 is closed.

That is, the elastic member 13 attached to the upper surface of the substrate 12 first comes into contact with the lower end of the connecting tube 4, and as the connecting rod 14 rises, the elastic member 13 is bent and brought into close contact with the lower end of the connecting tube 4. As a result, the lower end opening 4a of the connecting pipe 4 is closed, and the supply of powder and granular material is cut off.

Thereafter, compressed air is supplied into the pressure vessel 1, and the powder such as foundry sand supplied into the pressure vessel 1 is sent to the supplied part via an air transport pipe (not shown). Pneumatic transportation of powder and granules is a known technique.

As the connecting rod 14 rises, the tapered outer circumferential surface of the substrate 12 comes into close contact with the sealing member 10 and double seals the lower end opening 4a of the connecting pipe 4, so that the supply into the pressure vessel 1 is prevented. Compressed air is reliably prevented from flowing back into the hopper chute 19.

As is clear from the above description, the present invention is provided with a connecting pipe that connects a hopper to the upper part and has a flange fixed to the outer periphery of the lower end opening to which the pressure vessel can be connected, and the lower surface of the flange. An annular sealing member is provided on the top surface of the connecting tube so as to surround the lower end opening of the connecting tube, and a flexible elastic member that can be tightly attached to the lower end opening of the connecting tube is attached to the upper surface of the connecting tube. At the same time, since the truncated conical on-off valve whose outer periphery is tapered downward and can be brought into close contact with the sealing member can be raised and lowered, it is not possible to cut off the supply of powder unlike the conventional structure. Shutoff and sealing can be reliably performed by one simple device that can be opened and closed by a single drive device without separately providing a shutoff means and a sealing means for preventing backflow of compressed air, Furthermore, since the outer periphery of the on-off valve is tapered downward, powder particles will not fall along the outer periphery of the on-off valve and will not get caught between it and the sealing member, ensuring reliable operation. Since it is simple, it can be manufactured at low cost through a simple manufacturing process, and an extremely economical shutoff and sealing device for a powder supply port can be provided.

[Brief explanation of drawings]

The drawing is a longitudinal sectional view showing an embodiment of the present invention. In the drawing, 1 is a pressure vessel, 4 is a connecting pipe, 5 is a flange part,
7 and 8 are stepped parts, 10 is a sealing member, 11 is an on-off valve,
13 is an elastic member, and 19 is a hopper chute (powder supply device).

Claims (1)

[Scope of utility model registration request] A connecting pipe having a powder supply device connected to the upper part thereof and a flange part to which a pressure vessel can be connected in communication to the outer periphery of the lower end opening is fixed, and the lower end opening of the connecting pipe is surrounded by the lower surface side of the flange part. an annular sealing member whose distal end protrudes downward, and a flexible elastic member which is movable up and down relative to the connecting pipe and whose upper surface can be brought into close contact with the lower end opening of the connecting pipe. A shutoff and sealing device for a powder supply port, comprising: a truncated conical opening/closing valve having a downwardly expanding tapered outer circumferential portion that is capable of coming into close contact with the sealing member.