JPH08257620A - Spray nozzle with piston valve - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a spray nozzle with a piston valve that can be turned on and off at high speed independently and has excellent maintainability. [Structure] The pressure fluid for controlling the opening / closing of a piston valve is supplied through an inlet having a built-in shut-off needle capable of interrupting the supply to the piston valve at any time, and the inlet is provided with a nut with an air vent groove for a pressure fluid supply passage. are doing. Further, the inlet has a built-in shut-off needle removal prevention mechanism. The tip of the nozzle is equipped with a cap for fixing the nozzle assembly to the body assembly and a ring for preventing the cap from slipping out on the outer periphery of the tip body that contains the nozzle tip, and the body assembly is also provided on the outer periphery of the body assembly. It is provided with a nut for fastening connection to the spray pressure water supply header.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to improvements in spray nozzles with piston valves.

[0002]

2. Description of the Related Art A spray nozzle with a piston valve that can be turned on and off at high speed with a single nozzle of this type is extremely effective in cooling a hot steel plate or removing scale. In a production line for hot steel sheets, a plurality of spray nozzles are arranged on the upper and lower surfaces of the hot steel sheet in the width direction and the traveling direction at a predetermined pitch to install equipment for cooling the hot steel sheets or removing surface scale. Often. In recent years, in order to improve the uniformity in the width direction by controlling the spray width according to the plate width of the hot steel plate, and to improve the drainability immediately after passing through the hot steel plate, these nozzles are individually turned on and off. The need to do so is increasing. Further, for application to controlled cooling and the like, there is an increasing need to control the on / off of the nozzle at high speed in accordance with the passage of a hot steel plate.

Regarding such a spray nozzle capable of performing on / off control independently and at high speed, the present inventors have shown in FIG.
Invented the spray nozzle shown in FIG.
No. 9 publication. That is, in this technique, a valve seat 28 and a high-pressure actuating piston valve 26 for the inlet are installed downstream of the water liquid inlets 30, 29 at the rear end of the nozzle, and a jet tip 31 is attached to the tip of the nozzle. In the nozzle with a high-pressure actuated valve described above, the open / close piston valve 26 is supported on the nozzle axis by a cylinder 27 with a support body / rectifying member so that the piston can operate.
The support body / rectifying member cylinder 27 is provided with a high-pressure water passage 33 for valve opening / closing in a direction perpendicular to the nozzle axis on the downstream side of the cylinder, and when the high-pressure water in the cylinder 27 is depressurized to a low pressure, a piston valve Reference numeral 26 is a nozzle with a high-pressure actuating valve, which is opened from the valve seat 28 by the high pressure of the water / liquid flow to open the water / liquid inlet.

[0004]

However, a cooling device or a surface scale removing device for a hot steel sheet rolling line using such a spray nozzle is installed in a narrow space such as an inlet side or an outlet side of a rolling mill. Often, it is especially important to consider maintainability such as the ease of inspection and maintenance of the nozzle in a narrow space. In this respect, the spray nozzle of the above-mentioned conventional technology requires that the nozzle assembly be pulled out from the body assembly in order to inspect and maintain the main parts constituting the nozzle assembly such as the strainer, the nozzle tip, and the piston valve. It has been found that the following drawbacks are involved in workability and maintainability. That is,

(1) When the nozzle assembly is pulled out from the body assembly, there is no means for closing the pressure fluid for controlling the piston valve opening / closing supplied from the pressure fluid inlet, so that the pressure fluid leaks in large quantities. (2) In the same state as the previous item, air may be mixed into the pressure fluid supply passage for piston valve opening / closing control,
There is no air venting means when air is mixed in the pressure fluid supply passage, and it is difficult to remove the air mixed in the pressure fluid supply passage after the nozzle inspection and maintenance. (3) The nozzle assembly mounted in the body assembly is pulled out from the hod assembly by tightening the cap at the tip of the nozzle assembly. However, the scale is caught and the water scale is fixed between the outer wall of the nozzle assembly and the inner wall of the body assembly. It is easy to occur, and the work at the beginning of extraction is often difficult. (4) The body assembly has a one-piece structure in which it is fixedly connected to the header for supplying pressure water, and the body assembly cannot be replaced by itself.

To solve the above problems (1) and (2), there is also a method of providing a separate pressure valve and air bleeding device in the pressure fluid supply pipe to the inlet, but the pipe becomes complicated and It cannot be said to be a good solution because of the drawbacks such as the inevitable mixture of air after the on-off valve.

An object of the present invention is to solve the above-mentioned problems of the prior art, and to provide a spray nozzle with a piston valve that can be turned on and off at high speed independently and is excellent in maintainability.

[0008]

The spray nozzle of the present invention has solved the above-mentioned problems by the following means. That is, (1) an inlet for pressure fluid supply for piston valve opening / closing control is provided in connection with the body assembly, and a shut-off needle capable of interrupting the pressure fluid supply passage at any time is provided in the inlet, and further, if necessary. And a mechanism for preventing the shut-off needle from coming off. (2) An air bleeding mechanism for air mixed in the pressure fluid for controlling the piston valve opening and closing in the inlet is provided. (3) A nozzle assembly fixing cap provided at the tip of the nozzle assembly is provided with a ring that is located closer to the cap on the tip side to prevent the cap from falling off and facilitate the removal of the nozzle assembly. (4) A cap nut is provided on the outer periphery of the body assembly so that the body assembly can be detachably fastened and joined to the high-pressure water supply header for spraying.

[0009]

Operation: When inspecting, servicing or replacing the components of the nozzle assembly such as the strainer, nozzle tip, piston valve, etc., the work is performed according to the following procedure. (1) The shut-off needle of the inlet connected to the body assembly is closed to shut off the supply fluid passage of the pressure fluid for controlling the piston valve opening / closing. (2) Tighten the cap at the tip of the nozzle assembly to release the connection with the body assembly, and pull out the nozzle assembly. At that time, the cap comes into contact with the ring during the loosening of the cap, and thereafter, due to the rotational force of the cap, the fixation due to the biting of the scale between the nozzle assembly and the body assembly is released, and the cap is easily extracted. (3) After the inspection and maintenance of the nozzle assembly is completed, insert the nozzle assembly into the body assembly and fasten it to the body assembly with the cap at the tip of the nozzle assembly. (4) Open the shutoff needle of the inlet to release the cutoff of the pressure fluid supply liquid passage for controlling the piston valve opening / closing. (5) After the air bleeding nut of the inlet is loosened and air bleeding work is performed for a predetermined time, the air bleeding nut is returned to a normal state.

Further, when the body assembly or inlet needs to be inspected, serviced and replaced, the cap nut that fastens the body assembly to the pressure water supply header is rotated to release the fastening to the pressure water supply header. Then remove the body assembly.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention is shown in FIGS. FIG.
Is a single embodiment of the present invention, the nozzle alone is turned on at high speed.
FIG. 2 shows the entire structure of a spray nozzle with a piston valve that can be turned off, and FIG. 2 shows the structure of a pressure fluid supply inlet for piston valve opening / closing control attached to the nozzle.

First, the structure of the spray nozzle of the present invention will be described with reference to FIG. The nozzle assembly 12 is, in order from the pressure water introduction side for spraying, a strainer body 4 connecting the valve seat 3, a guide adapter 6 incorporating the piston valve 1 and the cylinder 2, a tip holder 7 incorporating a rectifier 5, a tip holder 7, and a jetting device. It is composed of a cap 11 for fixing a nozzle assembly 12 which has a built-in tip 8 and is provided movably on the outer periphery, and a tip assembly 13 provided with a ring 19 for preventing the cap 11 from coming off.

A piston valve 1 for opening and closing pressure water for spraying is vertically movably mounted inside a cylinder 2 which is fixed in a guide adapter 6 so as to form a flow path of pressure water on the outer periphery. , Has a function of blocking or unblocking the spray pressure water flow path between the strainer body 4 and the valve seat 3 installed at the end of the strainer body 4.

The pressure fluid for controlling the opening / closing of the piston valve 1 is supplied to the cylinder 2 from the outside of the nozzle assembly 12 via the flow path 14 opened to a part of the cylinder 2 and the guide adapter 6.

The cap 11 is provided on the outer periphery of the tip assembly 13 so as to be vertically movable and rotatable. The cap 11 is used to fasten and fix the nozzle assembly 12 to the body assembly 10 with a screw provided on the inner periphery. A ring 19 for preventing the cap 11 from slipping out is fixed at a distance shorter than the screw length of the inner peripheral portion of the cap 11 on the outer periphery of the assembly 13. Further, the cap 11 for fastening the nozzle assembly is fitted with a spanner (not shown) for turning the cap or a cap nut 11 (not shown) at the tip of the turning jig for releasing the fastening of the cap. −
a is formed.

The body assembly 10 for holding the nozzle assembly 12 and fixing it to the spray pressure water supply header 23 has a nut 20 for fastening and fixing it to the pressure water supply header 23 at its base portion and a nozzle assembly for fastening the tip outer peripheral portion. The main body 10 has a thread portion for controlling the pressure fluid supply so that the flow passage is formed on the same axis of the flow passage 14 for supplying the pressure fluid for controlling the piston valve opening and closing. The inlet 15 is fixedly arranged. In addition, the body assembly 10
The formation portion of the pressure flow passage 14 in the inner peripheral portion forms a groove-like flow passage in the circumferential direction in order to prevent axial deviation of the flow passage.

Next, the structure of the inlet 15 will be described with reference to FIG. The inlet 15 is attached to the body assembly so that the supply passage of the pressure fluid for controlling the opening and closing of the piston valve at the tip end is connected to the pressure fluid introduction port 14 of the body assembly 10 described above. A shut-off needle 16 installed in a fluid flow path for shutting off the pressure fluid, an air vent nut 17 for removing air mixed in the pressure fluid of the inlet, and an inlet from an external pipe via a flexible hose 24. It is composed of a fixed part of a flexible hose that takes in the pressure fluid.

The shut-off needle 16 has a bolt-like shape with a square head at its rear end, and its tip portion blocks pressure fluid discharge from the pressure fluid discharge port at the end of the inner cylinder of the inlet body. It has a conical shape so that it can. Also,
The shaft has a small diameter in the middle to prevent it from slipping out,
The air bleed nut 17 is attached by the screw provided in this small diameter part.
To be concluded.

The air vent nut 17 is screwed to the inner cylinder of the rear end portion of the inlet body 15 with a screw on the outer peripheral portion, but a groove 18 is provided in the axial direction of the screw portion to enhance the air venting effect. There is. Further, the inner cylinder portion is provided with the above-mentioned screw for fastening the shut-off needle, and when the air mixed in the pressure fluid of the inlet 15 is deflated, the fastening of the air bleeding nut 17 with the inlet body 15 is performed. There is a method of loosening and releasing the tightening of the seal 25 tightened by the nut and the inlet body.
It is used when a large amount of air is mixed in for repairing the pressure fluid supply pipe to the inlet, or when air is mixed in such as when the nozzle assembly 12 is pulled out from the body assembly 10 for the purpose of inspection and maintenance.

As described above, the spray nozzle with a piston valve, which is an embodiment of the present invention, is composed of the nozzle assembly 12, the body assembly 10 and the inlet 15. However, the body assembly 10
Is fastened to the nozzle mounting seat 21 of the spray pressure water supply header 23, the body assembly 1
0 and positioning pin 2 for header 23 for spray water supply
2 is inserted into the positioning hole provided in the mounting seat at the rear end of the body assembly 10 and the positioning hole provided in the nozzle mounting seat 20 of the header 23 for supplying high-pressure water for spraying 23 to perform positioning, and at the same time the body assembly 10
Prevent the rotation of.

Further, the positioning of the nozzle assembly 12 with respect to the body assembly 10 in the rotational direction is performed by a key groove provided on the inner peripheral portion of the tip of the body assembly 10 and a key groove provided on the outer peripheral portion of the tip holder 13 at the tip of the nozzle assembly 12. , Using the positioning key 9.

[0022]

As described above, according to the spray nozzle with a piston valve of the present invention, a nozzle tip in a narrow overflow space can be provided without impairing the original function of the spray nozzle which can be turned on and off independently and at high speed. It is easy to inspect, maintain and replace piston valves, etc.
It is possible to prevent the pressure fluid for controlling the piston valve from flowing out during the above replacement work, and it is easy to remove the air mixed in the pressure fluid supply circuit. Further, the effect that the body assembly in which the inlet is connected can be removed from the high-pressure water supply header is achieved.

[Brief description of drawings]

FIG. 1 is a side view showing a sectional structure of a spray nozzle with a piston valve of the present invention.

FIG. 2 is a side view showing a sectional structure of an inlet portion of the spray nozzle of the present invention.

FIG. 3 is a side view showing a sectional structure of a conventional spray nozzle with a piston valve.

[Explanation of symbols]

 1 Piston valve 2 Cylinder 3 Valve seat 4 Strainer body 5 Rectifier 6 Guide adapter 7 Tip holder 8 Ejection tip 9 Anti-rotation key 10 Body assembly 11 Cap 12 Nozzle assembly 13 Tip assembly 14 Pressure fluid passage 15 Inlet 16 Shut-off needle 17 Air vent nut 18 Air vent nut groove 19 Cap removal prevention ring 20 Cap nut 21 Nozzle mounting seat 22 Positioning pin 23 Spray pressure water supply header 24 Flexible fluid pressure hose 25 O-ring 26 Opening / closing piston valve 27 Support body・ Cylinder with rectifying member 28 Valve seat 29 Strainer body 30 Inlet slit 31 Jet tip 32 Body 33 High pressure water for valve opening / closing 34 the pressure fluid inlet 35 rectifying member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaki Yamamoto 2-4 Midoridaira, Yokaichiba, Chiba Prefecture Spraying Systems Japan Co., Ltd. Yokaichiba Factory (72) Inventor Yasuomi Akechi Midori, Yokaichiba, Chiba Prefecture Flat 2-4 Spraying Systems Japan Yoka Market Factory

Claims (5)

[Claims] 1. A nozzle in which a piston valve for opening and closing the introduced pressure water is built-in on the downstream side of the spray pressure water introduction port at the rear end portion of the nozzle, and the introduction pressure water jet nozzle tip is attached to the nozzle tip portion. In a spray nozzle with a piston valve, which comprises an assembly and a body assembly that holds the nozzle assembly and is fastened to a pressure water supply header for spraying, the pressure fluid for controlling the opening and closing of the piston valve incorporated in the nozzle assembly is the body assembly. A spray nozzle with a piston valve, which is supplied through a connected inlet and has a shut-off needle that can shut off the supply of the pressure fluid to the piston valve at any time. 2. A nozzle in which a piston valve for opening and closing the introduced pressure water is built in at the downstream side of the pressure water introduction port for spraying at the rear end portion of the nozzle, and the nozzle tip for ejecting the introduced pressure water is attached to the tip of the nozzle. In a nozzle spray with a piston valve, which comprises an assembly and a body assembly that holds the nozzle assembly and is fastened to a pressure water supply header for spraying, the pressure fluid for controlling the opening and closing of the piston valve incorporated in the nozzle assembly is A spray nozzle with a piston valve, which is supplied through a connected inlet, and is provided with a nut with a groove for bleeding air from the pressure fluid supply passage. 3. The piston according to claim 1, wherein the inlet for opening and closing the pressure fluid for opening and closing the piston valve, which is connected to the body assembly, is provided with a built-in shut-off needle removal preventing mechanism. Spray valve with valve. 4. A cap for fixing the nozzle assembly to the body assembly and a cap removal preventing ring are provided on the outer peripheral portion of a tip body containing a pressure water jet nozzle tip at the nozzle tip. Item 4. A spray nozzle with a piston valve according to any one of Items 1 to 3. 5. A nut for fastening and coupling to a header for supplying pressurized water for spraying of the body assembly is provided on an outer peripheral portion of the body assembly.
4. A spray nozzle with a piston valve according to any one of 4 above.