JPH0352113Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressure water injection nozzle valve used for cooling rollers that roll a steel plate during hot rolling in a steel plate rolling apparatus.

As shown in FIGS. 2 and 3, the rolling rollers heated during hot rolling of steel plates are cooled by a main pipe C that supplies pressurized water with a large number of injection nozzles E arranged before and after the rolling roller B. Several rollers are arranged in parallel, and the roller B is cooled by spraying high-pressure water (generally 150 kg/cm ² ; indicated by an arrow) from the spray nozzle E.

In this case, the pressurized water passes through the main pipe D and reaches the injection nozzle E installed in the main pipe C, but when the hot rolling work is completed, the main valve F (spool valve) is closed and the water supply is stopped. Then, air enters the main pipe D from the injection port of the injection nozzle E, and when the main valve F is opened and water is supplied while the air is still in the main pipe D, water is collected in the main pipe D. A water hammer phenomenon occurs in which air is rapidly compressed and then expands rapidly, and the severe impact causes accidents in which various parts burst or break.

Therefore, as a measure to prevent this accident, conventionally, as shown in Fig. 3, low pressure water (30 kg/cm ² ) is constantly supplied through the auxiliary pipe G, and this low pressure water is dripped from the injection nozzle E. It was designed to prevent air from entering.

However, in this conventional method, water is constantly dripped, and furthermore, as shown by arrow H in Fig. 3, the width of the steel plate to be rolled is narrow, and rolling roller B heats only a portion of the steel plate. Even when the jet nozzle is not injected, pressurized water is jetted from all the jet nozzles E, resulting in a problem of wasted water.

The present invention was made to solve these conventional problems, and its purpose is to provide the injection nozzle itself with a valve function so that when the main valve installed in the main pipe is closed, The valve inside the injection nozzle is automatically closed to prevent air from flowing in from the injection nozzle, thereby preventing the water hammer phenomenon. In addition to using a method to automatically open and close the valve in the injection nozzle without using separate power, a separate means for closing the valve in the injection nozzle is provided, so that when water pressure acts to automatically open the valve, Another object of the present invention is to provide a pressure water injection nozzle valve that can be closed at will.

The gist of the valve is that it has a cylindrical valve body that has a pressure water inlet on its side that communicates with the inside of the main pipe that supplies pressurized water, and a pressure water flow path that extends from the pressure water inlet to the nozzle port inside. and;
A valve portion is provided at one end to open and close the pressure water flow path by pressing into or away from a valve seat provided in the pressure water flow path, and a piston portion having a pressure receiving surface that receives the pressure of the pressure water is provided at the other end. and a piston valve having a bottom portion communicating with the pressure water inlet on the lower surface of the pressure receiving surface and slidably fitted into the valve body; pressing the piston portion to close the valve. a spring that biases the piston valve in a direction to press the valve seat against the valve seat; and a stopper mechanism that restricts the sliding of the piston valve and keeps the pressure water passage closed by the valve part; The pressurized water injection nozzle valve is characterized in that the pressurized water injection nozzle valve is installed across the diametrical direction of the valve body, and the pressurized water inlet is disposed at the lowest part of the main pipe on the side surface of the valve body.

That is, the pressure water injection nozzle valve of the present invention is used for descaling nozzles attached to hot rolling equipment, steel plate cooling nozzles, rolling roll cooling nozzles, etc., and is therefore used to open and close the injection port inlet. Even if the valve body is slightly worn, the piston valve opens quickly and reliably when the pressure water reaches a predetermined pressure, and when the pressure is lower than the predetermined pressure, it receives the static pressure of the pressurized water within the cylindrical valve body in order to quickly and reliably close the valve. A piston valve having a piston portion forming a pressure receiving surface is provided to be slidable in the axial direction of the valve body.

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

FIG. 1 is a cross-sectional view showing a pressure water injection nozzle valve A according to an embodiment of the present invention, and FIG. 4 is an explanatory diagram showing the usage state of the pressure water injection nozzle valve A. In the figure, 1 is the valve body, which is formed into a cylindrical shape, and inside the main pipe C that supplies pressure water, the main pipe C
It penetrates in a direction perpendicular to the axis of the pipe C, and is provided via a fitting 2 with both ends protruding from the pipe C, and one end of which is connected to a nozzle pipe part 4 having a nozzle opening 3 in the center. The tube portion 4 is threaded and can be attached to and detached from the valve body 1. Further, the pressure water inlet 5 formed in the valve body 1 is connected to a main pipe C through which the valve body passes.
Further, inside the valve body 1, there is formed a pressure water flow path 6 extending from the pressure water inlet 5 to the nozzle port 3.

7 is a piston valve, which has a valve part 8 for opening and closing the pressure water flow path 6 at one end, and forms a pressure receiving surface 9 that receives the pressure of the pressure water in the main pipe C at the other end. 10, and the piston portion 10
is slidably fitted into the valve body 1. The pressure water flow path 6 is provided with a valve seat 11, and when the valve portion 8 comes into pressure contact with the valve seat 11, the flow path 6 is closed, and when the valve portion 8 and the valve seat 11 are separated, the flow path 6 is closed. Route 6 is opened. Furthermore, 1
2 is an O-ring that seals the piston portion 10.

Reference numeral 13 denotes a spring, and the spring 13 closes the pressurized water flow path 6 by pressing the piston portion 10 and biasing the valve portion 8 in a direction that presses the valve portion 8 into contact with the valve seat 11. . When opening the flow path 6, the pressure of the pressurized water in the main pipe C passes through the pressure receiving surface formed in the piston part 10 through the bottom part 14, which is formed upward from the pressure water inlet 5. 9 and pushes up the piston valve 7, thereby separating the valve portion 8 and the valve seat 11 and opening the flow path 6.
It is something that opens up.

Reference numeral 15 denotes a stopper mechanism that restricts the sliding movement of the piston valve 7 so that the valve portion 8 holds the pressure water passage 6 in a closed state.

The stopper mechanism 15 has an air inflow hole 16 at the top.
It is composed of a cylinder 17 provided with The air inflow hole 16 provided at the top of the cylinder 17
The stopper piston part 19 is pushed down by the pressure of the air that has flowed in, and the push rod 18 provided at the lower part of the stopper piston part 19 comes into contact with the piston valve 7, so that the piston valve 7 is opened. This prevents the piston valve from sliding, thereby causing the valve portion 8 of the piston valve 7 to maintain the pressurized water passage 6 in a closed state.

Note that 20 and 21 are O-rings, and 22 and 23 are air vent holes.

Therefore, when the pressure water injection nozzle valve A configured as described above is attached to a rolling roller cooling device as shown in FIG. 4, first, when the main valve F provided in the main pipe D is closed, Since water pressure is not applied to the pressure receiving surface 9 formed on the piston part 10 of the pressure water injection nozzle valve A, the valve part 8 is moved by the elastic force of the spring 13 that biases the piston valve 7 as shown in FIG. It comes into pressure contact with the valve seat 11, and the pressure water flow path 6 is in a sealed closed state.

Next, during the rolling operation, when the main valve F is opened, pressure water flows from the main pipe D through the main pipe C into the pressure water injection nozzle valve A, and the pressure of this pressure water causes the piston valve 7 to be pressed against the spring 13. Push up against the valve part 8.
is moved away from the valve seat 11 to open the pressure water passage 6, and the heated rolling roller B is cooled by jetting out pressure water from the nozzle port 3 at the lower end.

When the main valve F is closed when the work is completed, the pressure inside the pressure water injection nozzle valve A decreases, and the spring 1
The piston valve 7 is pushed down to the state shown in FIG. By blocking the inflow, it is possible to prevent the water hammer phenomenon that occurs when air accumulates in the main pipe C and the main pipe D.

In addition, as shown by arrow H in FIG. 4, if the width of the plate to be rolled is narrow and only a portion of the rolling roller B can be heated and only that portion is desired to be cooled, air is sent to the stopper mechanism 15. Of the air pipes J installed in the air pipe J, if you open only the air pipe K that leads to the unnecessary pressure water injection nozzle valve A and feed air from the air inlet hole 16 of the valve A, The stopper piston part 19 is pushed down, the push rod 18 comes into contact with the piston valve 7, and the sliding of the piston valve 7 is regulated, whereby the pressure water flow path 6
is kept closed.

In addition, in order to cope with an unexpected accident in which the seal between the valve part 8 and the valve seat 11 is damaged and air inflows, low-pressure water is constantly supplied from the auxiliary pipe G as in the case shown in Fig. 3. In this case, the elastic force of the spring 13 is made larger than the pressure of the low-pressure water, so that the piston valve 7 does not operate under the pressure of the low-pressure water. Do it like this.

One embodiment of the present invention has been described above, but
The specific configuration of the present invention is not limited to the above embodiment.

For example, the fluid for operating the stopper mechanism 15 is not limited to air, but may be a liquid such as oil.

In addition, the nozzle pipe portion 4 is provided with a thread so that the valve body 1
Although it is formed to be detachable from the valve body 1, it may be formed integrally with the valve body 1.

The pressure water injection nozzle valve of the present invention is mainly used as a pressure water injection nozzle valve for cooling rolling rollers, but it can also be used as an injection nozzle valve for a scale cooling device.

As explained above, according to the present invention, the injection nozzle itself has a valve function, which prevents the inconvenience of air flowing in from the injection nozzle when the water supply is stopped, thereby preventing the water hammer phenomenon. This can prevent rupture and damage due to In addition, the structure is simple because the valve is opened and closed using the pressure of pressurized water.

The pressure water injection nozzle valve of the present invention has a stopper mechanism and can stop the injection of pressure water, so when a large number of the same nozzle valves are used in parallel, the width of the pressure water injection can be adjusted.

In addition, when using the pressure water injection nozzle valve of the present invention, the nozzle valve is installed so that it penetrates the main pipe that supplies pressure water, so important parts of the nozzle valve such as the stopper mechanism are removed. Since it is located between the surface that injects pressurized water and the pipe material that forms the main pipe, there is no fear that the main parts of the nozzle valve will be damaged by splashing or splashing of the injected pressurized water.
Further, the jetting surface is simplified, and the maintenance and management of the nozzle and the like is improved.

In addition, in the present invention, the pressure water inlet is placed at the lowest part of the main pipe on the side surface of the valve body, so that the piston valve receives the dynamic pressure in the main pipe on its outer periphery, thereby preventing lateral vibration or lateral shaking when the nozzle is opened or closed. We are trying to prevent this from happening,
Another effect is that stable nozzle opening/closing operations can be performed.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a pressure water injection nozzle valve which is an embodiment of the present invention, FIGS. 2 and 3 are explanatory views showing a cooling device for a rolling roller, and FIG. 4 is a pressure water injection nozzle valve. FIG. 3 is an explanatory diagram showing how the nozzle valve is used. A...Pressure water injection nozzle valve, B...Main pipe, 1...
... Valve body, 3 ... Nozzle port, 5 ... Pressure water inlet, 6 ... Pressure water flow path, 7 ... Piston valve, 8 ...
...Valve part, 9...Pressure receiving surface, 10...Piston part, 1
1... Valve seat, 13... Spring, 15... Stopper mechanism.

Claims (1)

[Scope of utility model registration request] A cylindrical valve body 1 having a pressure water inlet 5 on a side surface communicating with the inside of a main pipe C for supplying pressure water, and a pressure water passage 6 extending from the pressure water inlet 5 to a nozzle port 3 inside; one end; A valve portion 8 is provided to open and close the pressure water flow path 6 by pressing into or away from a valve seat 11 provided in the pressure water flow path 6, and a pressure receiving surface 9 that receives the pressure of the pressure water is formed at the other end. A piston valve 7 is provided with a piston portion 10, and has a bottom portion 14 formed on the lower surface of the pressure receiving surface 9 to communicate with the pressure water inlet 5, and is slidably fitted into the valve body 1. ; a spring 13 which presses the piston part 10 and biases the valve part 8 in a direction that presses the valve part 8 against the valve seat 11; and a spring 13 which restricts the sliding of the piston valve 7 and allows the valve part 8 to open the pressure water flow path 6. A stopper mechanism 15 for holding the valve body 1 in a closed state is provided, and the valve body 1 is installed across the diameter direction of the main pipe C, and the pressure water inlet 5 is connected to the innermost part of the main pipe C on the side surface of the valve body 1. A pressure water injection nozzle valve characterized by being located at the bottom.