JP2002254001A - Jet switchover device and jet system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a jet switchover device which makes it possible to carry out the work safely although a highly pressurized water is spouted from a jet device, and also to carry out the spouting work accurately without influencing other spouting device even though the highly pressurized water is spouted from plural number of the spouting device. SOLUTION: A jet switchover device 1 which is connected between a pump 5 and a spouting device 3 and which changes over supply and stop of the highly pressurized water from the pump, is equipped with an inlet port 13 connected to the pump side, an outlet port 17 exhausting the internal pressurized water, a switchover valve mechanism consisting of a mobile valve body 19 which works by pilot air and closes the outlet port and opens the exhaust port during sitting on a first valve seat 21, and which opens the outlet port and closes the exhaust port during sitting on a second valve seat 23, a throttling member 25 provided within a exhaust channel to the exhaust port, a pressing member 24 pressing the mobile valve body to the first valve seat, an air cylinder 33 and an arm 29.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection switching device for switching between supplying and stopping supply of high-pressure water from a pump to an injection device, and an injection system including such an injection switching device and an injection device.

[0002]

2. Description of the Related Art A number of methods have been adopted in which cleaning, surface peeling, and hanging operations with high-pressure water are performed by an operator using an injection gun that injects high-pressure water. Conventionally, as such an injection gun, a trigger lever type injection gun such as a purge type valve gun or a dump gun for releasing the entire amount of high pressure water when OFF, or a plunger type grip jet gun for stopping the flow of high pressure water when OFF has been conventionally used. Are known.

[0003] Purge type valve guns and dump guns are
A switching valve for switching between high-pressure water injection and injection stop, a trigger lever for operating the switching valve, and a drain valve and a drain tube for discharging high-pressure water inside the gun body to the outside when injection is stopped are provided. In this valve gun and dump gun, high-pressure water is injected while the lever is being pulled, but when the lever is released, the injection stops, and the drain valve opens to discharge the high-pressure water inside the gun body from the drain tube. As a result, the high-pressure water supply pump is operated without load.

The grip jet gun includes a trigger lever for opening and closing a high-pressure water passage to an injection port to switch between high-pressure water injection and injection stop. In this grip jet gun, high-pressure water is sent from a high-pressure water supply pump through a pressure regulating valve in order to always spray at a desired pressure. Is available.

[0005]

In such a conventional valve gun or dump gun, when the lever is released, that is, when the injection is stopped, the high-pressure water is discharged from the drain tube to the outside. It is excellent in that it can ensure safety. However, when the drain valve is opened, the entire amount of high-pressure water is discharged to the outside. Therefore, even when a plurality of injection guns are connected to one supply pump and work is performed, only one injection gun is used. When the injection is stopped, high-pressure water injection from another injection gun cannot be performed, and there is a problem that work by a plurality of injection guns cannot be performed simultaneously.

Further, the valve gun and the dump gun have a problem that the entire amount of high-pressure water is discharged from the drain valve, so that the drain valve is easily damaged and the life of the device is shortened.

On the other hand, the grip jet gun has a structure in which high-pressure water is always sent to the gun, and is not as reliable as a valve gun or a dump gun in terms of operator safety. Further, when injecting ultra-high-pressure water of 50 MPa or more from the grip jet gun, it is difficult to perform an accurate injection operation because the injection reaction force at the time of starting by the lever or during operation becomes large.

Although it is possible to connect a plurality of grip jet guns to a single supply pump and use them simultaneously, one grip jet gun can be used while simultaneously jetting high-pressure water from a plurality of grip jet guns. When the injection from the gun is stopped, all of the recoil caused by the stop cannot be absorbed by the pressure regulating valve, and as a result, the reaction may affect other gun injections and prevent accurate injection. There is.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an injection switching device and an injection system capable of performing a safe operation even when injecting ultra-high pressure water from an injection device. Main purpose. Another object of the present invention is to provide an injection switching device and an injection system that can perform an accurate injection operation without affecting other injection devices even when high-pressure water is injected from a plurality of injection devices. Another object of the present invention is to provide an injection switching device and an injection system that can simplify the structure of the injection device and prevent the device from being damaged.

[0010]

In order to achieve the above object, the invention according to claim 1 is connected to a supply path between a pump and an injection device, and supplies the high-pressure water from the pump to the injection device. In the injection switching device for switching between and supply stop,
An inlet port connected to the pump-side supply path, an outlet port connected to the injector-side supply path, a discharge port for discharging internal high-pressure water, a first valve seat opening to the outlet port side, and discharge. Operated by air supplied from the outside and a second valve seat that opens to the port side, seats on the first valve seat, closes the outlet port, opens the drain port, and seats on the second valve seat. A switching valve mechanism including a movable valve body that opens an outlet port and closes a drain port, and a throttle member provided in a drain passage to the drain port.

In the invention according to the first aspect, the outlet port is opened by the movable valve body being seated on the second valve seat,
High-pressure water is supplied from the pump to the injection device, and the movable valve element is
The outlet port is closed and the drainage port is opened by seating on the valve seat, and the high-pressure water is discharged to the outside.

In the present invention, since the internal high-pressure water is drained from the discharge port when the injection of the high-pressure water is stopped, the entire amount of the high-pressure water is discharged when the injection is stopped as in a conventional valve gun or dump gun having a drain valve. I won't. For this reason, even when the high-pressure water injection from one injection device is stopped while a plurality of injection devices are connected to one pump to perform the injection work at the same time, the high-pressure water from the pump to another injection device is The pressure does not drop. Therefore, the suspension of the high-pressure water injection from one injection device does not affect the other injection devices, and the injection work by the plurality of injection devices can be performed accurately.

Further, in the present invention, since high-pressure water is discharged from the discharge port when injection is stopped, even if a fixed discharge pump such as a triple plunger pump is used, the drain valve is connected to the injection device. The provision of the injection device can be omitted, the structure of the connected injection device can be simplified, and the life of the injection device can be prevented from being shortened due to a drain valve damage or the like. Further, the pressure regulating valve disposed on the pump can be omitted.

Further, in the present invention, since the throttle member is provided in the drain passage to the drain port, when the injection of high-pressure water is stopped, the high-pressure water inside is discharged as safe low-pressure water by the throttle member. . For this reason, high-pressure water is supplied to the injection device held by the operator only during high-pressure water injection, so that safety of the operator is achieved.

In addition, in the present invention, the high-pressure water discharged from the pump is always introduced into the injection switching device, and the high-pressure water injection and the high-pressure water discharge by stopping the injection are performed by moving one movable valve body. Therefore, it is possible to reliably switch between high-pressure water injection and high-pressure water discharge.

The switching valve mechanism according to the present invention may be any switching mechanism that switches between supplying and stopping supply of high-pressure water to the injection device with one movable valve body. It is preferable that the first valve seat and the second valve seat are provided at both ends of the valve body.

The throttle member in the present invention may be any member as long as it reduces the pressure of the internal high-pressure water and guides it to the discharge port. For example, an orifice or nozzle having a diameter smaller than the diameter of the drainage channel can be used.

According to a second aspect of the present invention, there is provided the injection switching device according to the first aspect, further comprising a pressing member which presses and biases the movable valve body in a seating direction with respect to the first valve seat. And

According to the second aspect of the present invention, since the pressing member urges the movable valve body in the seating direction with respect to the first valve seat, the movable valve is explicitly operated by operating a lever or the like of the injection device. As long as the body is not moved to the second valve seat side, the high-pressure water is not supplied to the injection device, so that the safety of the worker can be further improved.

The invention according to claim 3 is the injection switching device according to claim 1 or 2, further comprising: an air cylinder; an arm connecting a plunger of the air cylinder to the movable valve body; The arm is rotatable around one end as a fulcrum.

According to the third aspect of the present invention, since the arm connects the plunger of the air cylinder to the movable valve, the movement of the plunger of the air cylinder is transmitted to the movable valve by the arm. At this time, since the arm is rotatable with one end as a fulcrum, even if the air cylinder is small, the movement force of the plunger is increased and transmitted to the movable valve body to easily switch between injection and injection stop. Can be.

As the air cylinder in the present invention, for example, the air control valve is switched by pilot air sent from the injection device to the injection switching device by operating the operation device of the injection device, and is operated by communicating with an external air source. Examples include an air cylinder and an air cylinder that is operated by air supplied from an air source via an injection device.

According to a fourth aspect of the present invention, a plurality of injection devices for injecting high-pressure water, and switching between injection of high-pressure water from the injection device and stop of injection, which are connected to a supply path between the pump and the injection device. In a high-pressure water injection system including an injection switching device, each of the plurality of injection devices includes an operation unit that operates the injection switching device, and the injection switching device is connected to a pump-side supply path. An inlet port, an outlet port connected to the injector-side supply passage, a discharge port for discharging internal high-pressure water, a first valve seat opening on the outlet port side, and a second valve opening on the discharge port side. Movable valve seated on a first valve seat to close an outlet port and open a drain port, and seated on a second valve seat to open an outlet port and close a drain port by means of the valve seat and the operating means. Body A switching valve mechanism comprising, characterized in that is obtained and a diaphragm member provided on the drainage path to the drainage port.

According to a fourth aspect of the present invention, there is provided an injection system comprising an injection device and the injection switching device according to the first aspect, and has the same operation and effect as the first aspect of the invention.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 3 is a configuration diagram of the high-pressure water injection system of the present embodiment. As shown in FIG. 3, the high-pressure water injection system according to the present embodiment is connected to a plurality of injection guns 3, a pump 5 for supplying high-pressure water to the injection gun 3, and a supply path between the pump 5 and the injection gun 3. And a plurality of injection switching devices 1 for switching between supplying and stopping supply of high-pressure water from the pump 5 to the injection device.

FIG. 1 is a schematic configuration diagram of an injection switching device 1 of the present embodiment. As shown in FIG. 1, the injection switching device 1 of the present embodiment includes an inlet port 13, an outlet port 15, a discharge port 17, a switching valve, and an orifice provided in a drain passage 27 to the discharge port 17. 25 and spring 24
, An air cylinder 33 and an arm 29. Here, the orifice 25 is a throttle member in the present invention, the spring 24 is a pressing member in the present invention, and the arm 29 is connected to the supply hose 7 from the pump 5 to the inlet port 13 constituting an arm in the present invention. And high-pressure water from the pump 5 is introduced. The outlet port 15 is connected to a supply hose 7 for the injection gun 3 so that high-pressure water is supplied to the injection gun 3. The drain port 11 is connected to the drain tube 11 for discharging the high-pressure water inside the switching device to the outside.

The switching valve switches between supplying and stopping supply of high-pressure water to the injection gun 3, and includes a first valve seat 21 opening to the outlet port side and a second valve seat 23 opening to the discharge port side. And a spool 19 seated on each valve seat. Here, the spool 19 constitutes a movable valve body in the present invention. The first valve seat 21 and the second valve seat 23 are arranged on both ends of the spool 19. Therefore, spool 1
9 is seated on the first valve seat 21 so that the outlet port 15
To stop the supply of high-pressure water to the injection gun 3 (stop injection from the injection gun 3) and open the drain port,
The internal high-pressure water is discharged from the drain tube 11.

On the other hand, when the spool 19 is seated on the second valve seat 23, the outlet port 15 is opened to supply high-pressure water to the injection gun 3 (inject from the injection gun 3) and to close the drain port. Has become. In this manner, the supply of the high-pressure water to the injection gun 3 and the stop of the supply are reliably switched by the movement of the spool 19.

The spring 24 constantly urges the spool 19 from the second valve seat side toward the first valve seat. For this reason, normally, the high pressure water is not supplied to the injection gun 3 but the injection gun 3 is supplied by the pilot air supply from the injection gun 3 described later.
To supply high-pressure water to the jet.

The air cylinder 33 is connected to the injection gun 3 by the pilot air hose 10 via the air control valve 12, and to the air compressor 45 by the air hose 9b. Then, when pilot air is sent from the pilot air hose 10 by operating the lever of the injection gun 3, the air control valve 12 is switched to directly send air from the air compressor to operate the air cylinder 33 and move the plunger 31. It has become. One end (the upper end A in FIG. 1) of the arm 29 is connected to the plunger 31 and is connected to the spool 19 at an operation point B which is a position slightly below the center of the arm 29. The arm 29 is rotatable in the directions D and E around the lower end C in FIG. Therefore, when the plunger 31 moves in the left-right direction in FIG. 1, the arm 29 rotates about the lower end C in FIG. 1, and the movement of the plunger 31 is transmitted to the spool 19 connected to the arm 29 at the operation point B. Then, it moves between the first valve seat 21 and the second valve seat 23.

In a drain 27 leading to the discharge port 17,
An orifice 25 smaller in diameter than the drainage channel 27 is fitted. When the high-pressure water inside the switching valve is discharged from the drain tube 11, the pressure is returned to normal pressure by the orifice 25.

Next, the injection gun 3 of this embodiment will be described. FIG. 2 is a schematic configuration diagram of the injection gun 3 of the present embodiment. As shown in FIG. 2, the injection gun 3 of the present embodiment
Nozzle 35, nozzle cover 37, air motor 43
, A lever 39, and a handle 41,
High-pressure water is injected while rotating the nozzle head at high speed.

In the injection gun 3 of this embodiment, a supply hose 7 is connected to the rear of the main body, and the other end of the supply hose 7 is connected to the injection switching device 1 so that high-pressure water is supplied. I have. Also, the main body lever grip 40
The air hose 9a and the pilot air hose 10 are connected, and the other end of the pilot air hose 10 is connected to the air control valve 12.

The lever 39 constitutes the operating means in the present invention. When the lever 39 is pulled, the air motor 43 is driven, and the air cylinder 3 of the injection switching device 1 is operated.
3 is supplied with air. That is, the injection of the high-pressure water from the nozzle 35 is normally stopped,
When the lever 39 is pulled, the injection switching device 1 is
The high-pressure water is supplied through the nozzle and is ejected from the nozzle 35.

Next, a method of using the injection system and the injection switching device 1 of the present embodiment configured as described above will be described.

First, the operator holds the injection gun 3 toward the object to be injected. In this state, the spool 19 of the injection switching device 1 is seated on the first valve seat 21 by the pressing force of the spring 24, that is, the injection is performed. Since the outlet port 15 connected to the gun side supply hose 7 is in a closed state,
High-pressure water has not been jetted from the nozzle 35 yet.

When the operator pulls the lever 39 at hand, the air motor 43 operates and simultaneously sends pilot air to the air control valve 12 of the injection switching device 1. Since the air from the air compressor is directly sent to the air cylinder 33 by switching the air control valve 12, the air cylinder 33 operates and the plunger 31 moves. The movement of the plunger 31 is transmitted to the spool 19 by the arm 29, and the spool 19 is
1 and moves in the second valve seat direction against the pressing force of the spring 24 to be seated on the second valve seat 23. Thereby, the outlet port 15 of the injection switching device 1 is opened, high-pressure water is supplied to the injection gun 3, and high-pressure water is injected from the nozzle 35.

To stop high-pressure water injection, release the lever 39 at hand. As a result, the air motor 43 stops, and the delivery of pilot air to the injection switching device 1 stops, so that the plunger 31 of the air cylinder 33 returns to the original position. Along with this, the spool 19 moves away from the second valve seat 23 toward the first valve seat, and closes the outlet port 15 by sitting on the second valve seat 23. For this reason,
The supply of high-pressure water to the injection gun 3 stops, and the injection of high-pressure water from the nozzle 35 stops. Further, when the spool 19 is separated from the second valve seat 23, the discharge port 17 is opened, so that the internal high-pressure water is discharged from the discharge port 17 to the outside through the drain tube 11. At this time, the high-pressure water is drained 2
Since the water passes through the orifice 25 provided in the nozzle 7, the water becomes low-pressure water by the orifice 25 and is discharged from the drain tube 11. For this reason, high-pressure water is supplied to the injection gun 3 only at the time of high-pressure water injection, and there is no danger of the operator touching the high-pressure water, thereby ensuring the safety of the operator.

As described above, in the injection system and the injection switching device of the present embodiment, when the injection of the high-pressure water is stopped, the internal high-pressure water is drained from the discharge port 17, so that when the injection is stopped, the entire amount of the high-pressure water is discharged. There is no end. For this reason, even when the high-pressure water injection from one injection gun is stopped, the pressure of the high-pressure water from the pump 5 to another injection gun does not decrease, and the injection work by a plurality of injection guns can be performed accurately. .

In the present invention, since high-pressure water is discharged from the discharge port 17 when injection is stopped, there is no need to provide a drain valve, the structure of the injection gun is simplified, and the life of the injection gun is prolonged. .

In the injection system of this embodiment, the pump 5
Supplies high pressure water to a plurality of injection guns, but it may be configured to supply high pressure water to a single injection gun. Further, the injection gun used is not limited to the one in the present embodiment,
Any type of injection gun capable of sending pilot air to the injection switching device 1 can be used.

In the injection switching device of this embodiment, the orifice is used as the throttle member of the present invention. However, if the orifice has a function of reducing the pressure of the high-pressure water or returning to normal pressure, other members are used as the throttle member. May be used.

[0043]

As described above, according to the present invention,
Even when multiple injection devices are connected to one pump to perform injection work at the same time, stopping injection of high-pressure water from one injection device does not affect other injection devices. This has the effect that it can be performed accurately. Further, according to the present invention, since high-pressure water is discharged from the discharge port when injection is stopped, there is no need to provide a drain valve in the injection device, and the structure of the connected injector system is simplified, and damage to the drain valve, etc. Therefore, it is possible to prevent the life of the injector from being shortened. Further, according to the present invention, high-pressure water is supplied to the injection device held by the operator only during high-pressure water injection, which has the effect of ensuring the safety of the operator. In addition, the present invention has an effect that the high-pressure water injection and the high-pressure water discharge can be reliably switched.

According to the third aspect of the present invention, even when the air cylinder is small, the movement of the plunger is increased and transmitted to the movable valve body to easily switch between injection and injection stop. .

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an injection switching device of the present embodiment.

FIG. 2 is a schematic configuration diagram of an injection gun of the present embodiment.

FIG. 3 is a schematic diagram illustrating a configuration of an injection system according to the present embodiment.

[Explanation of symbols]

 1: Injection switching device 3: Injection gun 5: Pump 7: Supply hose 9a, 9b: Air hose 10: Pilot air hose 11: Drain tube 12: Air control valve 13: Inlet port 15: Outlet port 17: Drain port 19: Spool 21 : 1st valve seat 23: 2nd valve seat 24: Spring 25: Orifice 27: Drainage channel 29: Arm 31: Plunger 33: Air cylinder 35: Nozzle 37: Nozzle cover 39: Lever 40: Lever grip part 41: Handle 43 ： Air motor 45 ： Air compressor

Continued on the front page F term (reference) 3H067 AA02 BB02 CC55 CC60 DD05 DD33 DD47 ED20 FF17 GG13 GG21 4D073 AA05 BB03 CA30

Claims (4)

[Claims] 1. An injection switching device that is connected to a supply path between a pump and an injection device and that switches between supplying and stopping supply of high-pressure water from the pump to the injection device. A port, an outlet port connected to the injector-side supply passage, a discharge port for discharging internal high-pressure water, a first valve seat opening on the outlet port side, and a second valve opening on the discharge port side. The valve is actuated by air supplied from the outside and seated on the first valve seat to close the outlet port and open the drain port, and to seat on the second valve seat to open the outlet port and close the drain port. A switching valve mechanism comprising: a movable valve body that closes; a throttle member provided in a drainage channel to the drainage port;
An injection switching device comprising: 2. The injection switching device according to claim 1, further comprising a pressing member that presses and biases the movable valve body in a seating direction with respect to a first valve seat. 3. An air cylinder, an arm for connecting a plunger of the air cylinder and the movable valve body, and the arm is rotatable around one end as a fulcrum. Item 3. The injection switching device according to Item 1 or 2. 4. A plurality of injection devices for injecting high-pressure water, and an injection switching device connected to a supply path between a pump and the injection device for switching between injection of high-pressure water from the injection device and stop of injection. In the high-pressure water injection system, each of the plurality of injection devices includes operating means for operating an injection switching device, wherein the injection switching device includes an inlet port connected to a pump-side supply path, and an injection device. An outlet port connected to the side supply passage; a discharge port for discharging the internal high-pressure water; a first valve seat opening on the outlet port side; a second valve seat opening on the discharge port side; A movable valve body seated on the first valve seat to close the outlet port and open the drain port, and seated on the second valve seat to open the outlet port and close the drain port. Valve mechanism , A stop member provided on the drainage path to the drainage port,
An injection system characterized by comprising: