JPS5918209Y2 - Semi-solid discharge valve - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a valve used at a discharge port of a storage tank for milky fluids, semi-solid fluids, etc., such as mortar, slurry, sewage, and semi-solid chemical products.

In storage tanks that handle mixtures of solids and water, such as mortar and slurry, discharge port valves having a configuration as shown in FIG. 2 have been widely used at their discharge ports.

That is, a piston valve body C equipped with a ring B is slidably inserted into a valve box A whose front end is open, and the piston valve body C is moved in the front-rear direction by a cylinder-type drive device E via a valve stem. It is configured to slide, and when discharging mortar G from the storage tank F, the piston valve body C is pulled outward and the mortar G flows out from the discharge port H.

Further, when stopping the outflow of the mortar G, the piston valve body C is pushed inward and held at the position indicated by the dotted line.

However, with the conventional discharge port valve as shown in Figure 2, if the valve is kept closed for a long time, the mortar adhering to the inner wall of the valve box A dries and sticks, making it difficult to open the valve smoothly. There are drawbacks.

In addition, even if the dryness of the mortar is minimal, damage can easily occur to the ring B of the valve body and the inner wall of the valve body A, resulting in leaks when the valve is closed and the need for complicated repair work. There are drawbacks.

The present invention aims to solve the above-mentioned problems with conventional discharge port valves of this type, and by providing a mechanism for functionally cleaning the inner wall of the valve box, piston valve body, etc.
It is an object of the present invention to provide a semi-solid discharge port valve that allows smooth valve operation at all times and can almost completely prevent damage to the valve body ring and wear on the valve body wall.

In the present invention, a piston is provided slidably in contact with the inner cavity of a cylinder that is open at the front, and a cylindrical cleaning pipe with a number of nozzles bored therein and a screw guide are fixed to the rear of the piston. A cleaning pipe and a piston guide are arranged so as to be moved forward and backward in the cylinder inner cavity by a driving device, and a cleaning water outer passage communicating with the front and rear of the piston guide is provided on the outer periphery of the piston guide, and an outer passage for cleaning water is provided on the inner side of the piston guide. Washing water inner passages communicating between the rear of the piston guide and the inside of the washing pipe are provided, a water injection pipe for introducing washing water is provided on the rear side wall of the cylinder, and a discharge pipe is provided on the front lower side wall of the cylinder. The basic configuration of the invention is to arrange them respectively.

In the present invention, by injecting cleaning water from the water injection pipe after the valve is closed, the cleaning water is uniformly discharged into the cylinder from both the outer passage 31 of the piston guide and the nozzle of the cleaning pipe, and the inner cavity of the cylinder is will be thoroughly and efficiently cleaned from top to bottom.

Hereinafter, the details will be explained based on an embodiment of the present invention shown in FIG.

FIG. 1 is a vertical right side view of a mortar outlet valve attached to a mortar tank.

However, regarding the drive device 5, only the external appearance is shown with the middle part omitted.

7 is a mortar tank, in which mortar m is stored.

A cylinder mounting seat 71 is formed around the open lower portion 0 on the lower side surface of the mortar tank 7 .

A flange 1 constituting the outer shell of the discharge port valve is attached to the open lower portion 0.

That is, the flange 13 provided at the front end of the cylinder 1 which is open at the front is brought into contact with the cylinder mounting seat 71, and the flange 13 is fixed to the mounting seat 71 with the cylinder mounting bolt 14.

The cylinder 1 has a horizontally extending cylindrical shape, and a discharge port 17 is provided in the lower side wall near the front, and a water inlet 18 is provided in the upper surface of the side wall near the rear.

The rear end portion of the cylinder 1 is covered with a disk-shaped cylinder cover 10.

That is, the rear end flange 12 of the cylinder 1 and the cylinder cover 10 are connected to each other by the cover mounting bolts 16 passing through these members.
And it is fixed by a nut 15 which is screwed into this.

A water injection pipe 8 for introducing cleaning water is fixed to the water injection port 18 of the cylinder 1 by welding or the like.

On the other hand, a discharge pipe 6 for discharging mortar is fixed to the discharge port 17 of the cylinder 1 by welding or the like.

The piston 2 is in contact with the inner wall of the cylinder 1 which is open at the front.
is slidably provided.

Several grooves are cut into the sliding surface of the piston 2, into which the piston packing 20 is fitted.

4 is a cylindrical cleaning pipe with many nozzles 42 on its side circumferential surface.
is perforated.

The front end of the cleaning tube 4 is inserted and fixed into a cleaning tube attachment recess 23 provided at the rear of the piston 2.

Reference numeral 3 denotes a piston guide, the first half of which is in partial contact with the inner wall of the cylinder 1 .

That is, for example, eight cleaning water outer passages 31 are cut out in the outer circumference of the piston guide 3.
It connects the front and back of the

A cleaning tube attachment recess 33 is bored in the front end surface of the piston guide 3, into which the rear end of the cleaning tube 4 is fitted.

In addition, in order to communicate the rear of the piston guide 3 with the inner cavity of the cleaning tube 4, a plurality of (for example, eight
) is perforated with a cleaning water inner passage 30.

Reference numeral 5 denotes a drive device such as a hydraulic or pneumatic cylinder, which is fixed to the cylinder cover 10 at a front end flange 53 with drive device mounting bolts 55.

A piston rod 51 is moved forward or backward as desired by the drive device 5.

The piston rod 51 passes through the cover 10, and a gasket 11 is interposed between the cover 10 and the rod 51.

A rod head 56 having a shoulder portion having a larger outer diameter than the rod 51 is fixed to the front end of the piston rod 51 by screwing or the like.

The rod head 56 is inserted into the recess on the back surface of the piston guide 3, and is supported by a bushing 38 screwed into the piston guide 3 from behind to prevent its shoulder from being pulled out.

A connecting bolt 9 connects the piston 2, the cleaning pipe 4, and the piston guide 3.

That is, a coupling bolt through hole 28 is bored horizontally in the center of the piston 2, and a coupling bolt screw hole 34 is bored in the center of the front surface of the piston guide 3.

Then, the coupling bolt 9 passes through the coupling bolt passage hole 28 and the inner cavity of the cleaning tube 4, and is screwed into the coupling bolt screw hole 34 of the piston guide 3.

Figure 1 shows the valve in the closed state, with the front end surface of the piston 2 pointing at the arrow S.
However, if the drive device 5 is operated, the piston 2
can be slid backwards.

When the front end surface of the piston 2 retreats to the position indicated by arrow O, the valve becomes fully open.

The operation of the above configuration will be explained.

When taking out the mortar, the piston 2 is moved backward by the drive device 5 (arrow b), the mortar m is guided from the mortar tank 7 into the cylinder 1 (arrow a), and is further discharged from the discharge pipe 6 to the outside.

At this time, the mortar m adheres to the entire inner wall of the cylinder 1 up to the arrow O.

When a predetermined amount of mortar has been taken out, the drive device 5 is operated to push out the piston 2 to bring it into a fully closed state.

In this case, will the piston 2 be arranged as shown in Figure 1'?
Mortar still remains in the area from arrow S to O.

Therefore, pressurized water is introduced from the water injection pipe 8 into the inner cavity of the cylinder 1 (arrows e and f).

The pressure water is split into two streams at the piston guide 3.

One type of water flows through the outer cleaning water passage 31 and has the function of forcibly cleaning the inner wall surface of the cylinder 1 near the piston guide 3 and removing mortar components.

The other type is a flow that enters the inner cavity of the cleaning pipe 4 from the inner cleaning water passage 30 and jets out from the nozzle 42 to the inner surface of the cylinder 1 with a strong force, thereby making it possible to clean the entire inner cavity of the cylinder 1.

The cleaning water then joins together and is discharged from the discharge pipe 6 (arrow d).

In the present invention, a cleaning water outer passage 31 is provided in the piston guide 3, and the cleaning water spouted from here cleans the mortar adhering to the inner wall surface of the cylinder near the piston guide 3. Since the cleaning water is ejected from a large number of nozzles 42 toward the inner wall of the piston, the inner cavity of the cylinder 1 can be completely and thoroughly cleaned with great ease and efficiency.

Note that it is sufficient to inject the cleaning water into the cylinder for a certain period of time immediately after the valve is closed, and since the mortar and the like are not solidified immediately after the valve is closed, the effect is significant and the amount of cleaning water can be reduced.

In this way, the inner cavity of the cylinder is always kept clean, so the valve opening and closing operations can be performed smoothly, there is less damage to the inside of the cylinder 1, the piston seal, etc., and there is no need to place an excessive burden on the drive device. I don't even hang it.

Although this example describes mortar, the present invention is not limited to this, and can be applied to slurry, sewage, emulsified chemical products,
It has wide versatility as a semi-solid discharge port valve.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a semi-solid discharge port valve according to an embodiment of the present invention. FIG. 2 is a longitudinal sectional view of a conventional semi-solid discharge port valve. 1 is the cylinder, 2 is the piston, 3 is the piston guide, 4
is a cleaning pipe, 5 is a drive device, 6 is a discharge pipe, 7 is a mortar tank, 8 is a water injection pipe, 9 is a coupling bolt, 10 is a cylinder cover, 30 is a cleaning water inner passage, 31 is a cleaning water outer passage, 42
is a nozzle.

Claims (1)

[Scope of utility model registration request] A piston 2 is provided slidably in contact with the inner cavity of the cylinder 1 which is open at the front, and a large number of nozzles 4 are installed behind the piston 2.
A cylindrical cleaning pipe 4 having a hole in the cylinder 2 and a piston guide 3 are fixed to each other, and the piston 2, the cleaning pipe 4, and the piston guide 3 are arranged so as to be moved forward and backward in the inner cavity of the cylinder 1 by a driving device 5, and the piston guide A cleaning water outer passage 31 that communicates between the front and rear of the piston guide 3 is provided on the outer periphery of the piston guide 3, and a cleaning water inner passage 30 that communicates between the rear of the piston guide and the inside of the cleaning pipe 4 is provided on the inner side of the piston guide 3. A semi-solid material discharge port valve is constructed by disposing a water injection pipe 8 on the rear side wall of the cylinder 1 to introduce cleaning water, and a discharge pipe 6 on the front lower side wall of the cylinder 1.