JPH0125645Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an abnormality detection device for a cleaning nozzle for a high-pressure washer.

In machining lines and the like, high-pressure washers are used for the purpose of deburring and cleaning machined workpieces. This high-pressure washer uses a large number of cleaning nozzles (sometimes hundreds), but due to the large number of cleaning nozzles, it is difficult to confirm that the cleaning nozzle is clogged with foreign matter and its performance is reduced. It's not easy. For this reason, conventionally, in order to detect clogging of the cleaning nozzle, it has been considered to do the following.

(1) A low-pressure pump dedicated to checking for clogging of the cleaning nozzle is provided, and low-pressure water from this pump is supplied to the cleaning nozzle, and the condition of the liquid flowing out from the nozzle is visually inspected.

(2) A stop valve is installed in the high-pressure cleaning liquid supply path from the high-pressure pump to the cleaning nozzle of the high-pressure washer, and the opening degree of this valve is adjusted to supply a small amount of liquid to the nozzle. Visually inspect condition.

Among the above, in the case of (1), there is a problem in terms of space and cost for installing a low-pressure pump, and
In the case of (2), it is difficult to adjust the opening of the stop valve, and the operator who checks for nozzle clogging must go to a dangerous place where high-pressure liquid is spouted.
This will expose workers to extremely dangerous conditions.

For the above reasons, methods (1) and (2) have not been implemented, and a method of replacing the cleaning nozzle periodically (every six months) has been adopted. However, with this method of periodically replacing the cleaning nozzle, even if the cleaning nozzle becomes clogged with foreign matter, the nozzle remains clogged until it is time to replace it, making it difficult to ensure the quality of the workpiece during the cleaning process. The drawback was that it was not possible to do this adequately.

The purpose of this invention is to provide a device that can safely and easily detect foreign matter clogging of a cleaning nozzle for a high-pressure washer without using special equipment such as a low-pressure pump.

In order to achieve this purpose, the structure of this invention is as follows. That is, a nozzle valve is provided in a passage connecting the high-pressure pump and the cleaning nozzle and is opened when cleaning liquid is discharged from the cleaning nozzle, and a cleaning liquid is opened when the cleaning liquid is not discharged from the cleaning nozzle and is sent out from the high-pressure pump. The drain passage connecting the drain valve and the tank of a high-pressure washer having a drain valve for returning water to the tank is provided with a flow rate adjustment valve that can adjust the flow rate of the cleaning liquid flowing through the drain passage.

First, a conventional high-pressure washer will be explained.

In the figure, the high-pressure pump 1 that pumps out the cleaning liquid contained in the tank 2 at high pressure and in large quantities includes a first
A suction pipe 5 equipped with a stop valve 3 and a filter 4 is connected. A gauge 7 is attached to the discharge pipe 6 of the high-pressure pump 1. This discharge pipe 6 has a second pipe on the downstream side of the gauge 7.
A stop valve 8 and a third stop valve 9 are attached, and the second stop valve 8 is connected to the third stop valve 9.
It is located further upstream. The second stop valve 8 is connected to the drain valve 10 via a connecting pipe 12, and the second stop valve 9 is connected to the cleaning valve 11.
It is connected to via a connecting pipe 13. A first drain pipe 14 is attached to the drain valve 10. This first drain pipe 14 is connected at the outlet side of the fourth stop valve 16 to a second drain pipe 15 which has a fourth stop valve 16 and is connected to the discharge pipe 6 on the downstream side of the gauge 7. . A nozzle pipe 18 having a cleaning nozzle 17 attached to its tip is connected to the nozzle valve 11 . In addition,
The first, second and third stop valves 3, 8 and 9 are normally open.

A first air valve 19 for actuating the drain valve 10 is connected to the drain valve 10 by a first conduit 21 having a check valve 22 and a second conduit 23 having a check valve 24 . The first air valve 19 has an air supply pipe 2
5 and an air discharge pipe 26 are connected.

A second air valve 20 for actuating the nozzle valve 11 is connected to the nozzle valve 11 by a third conduit 27 with a check valve 28 and a fourth conduit 29 with a check valve 30. An air supply pipe 31 and an air discharge pipe 32 are connected to the second air valve 20 . Further, the discharge pipe 6 is provided with a relief passage 33 having a relief valve 34 upstream of the second drain pipe 15 .

As shown in the drawing, an appropriate number of third stop valves 9 are attached to the discharge pipe 6, and a cleaning valve 11 having a cleaning nozzle 17 is attached to each third stop valve 9. There is.

In the high-pressure cleaning device having the above configuration, during idle operation, the first air valve 19 is connected to the air supply pipe 25.
Since the drain valve 10 is opened by being operated by the air supplied from the first drain pipe 1, the connecting pipe 12 is connected to the first drain pipe 1.
Connected to 4. Therefore, the cleaning liquid in the tank 2 sucked into the high-pressure pump 1 via the suction pipe 5 flows to the drain valve 10 via the discharge pipe 6 and the connecting pipe 12, and from this drain valve 10 to the first drain pipe 14.
and is returned to the tank 2 via the second drain pipe 15. Note that when the drain valve 10 is open,
Since the second air valve 20 is switching the air flowing in from the air supply pipe 31, the nozzle valve 11 is closed.

Next, when the high pressure cleaning device is activated, the first air valve 19 closes the drain valve 10, and the second air valve 20 closes the drain valve 10.
opens the nozzle valve 11. For this reason, high pressure pump 1
The high-pressure cleaning liquid sent out flows from the discharge pipe 6 to the connecting pipe 13, passes through the nozzle pipe 18, and is ejected from the cleaning nozzle 17.

The high-pressure cleaning device of this invention is similar to the conventional high-pressure cleaning device described above, except that the first drain pipe 14 is provided with a flow rate regulating valve 35 as a cleaning nozzle abnormality detection device.

In the above configuration, in order to detect clogging of the cleaning nozzle 17, the drain valve 10 is opened as when the high-pressure cleaning device is running idle, and the second air valve 20 is operated as during cleaning to close the nozzle. Open valve 11. In this way, the drain valve 10
and nozzle valve 11 at the same time, high pressure pump 1
Most of the cleaning liquid discharged from the drain valve 10 returns to the tank 2 via the first drain pipe 14 and the second drain pipe 15. In this case, when the opening degree of the flow rate regulating valve 35 is adjusted, the flow rate of the cleaning liquid that passes through the first drain pipe 14 and returns to the tank 2 is restricted. Therefore, the cleaning liquid is discharged from the cleaning nozzle 17 via the nozzle valve 11. Therefore, the opening degree of the flow rate regulating valve 35 is adjusted appropriately to lower the discharge pressure of the cleaning liquid from the cleaning nozzle 17 to a pressure that is suitable for visual inspection and is safe (4 to 5 kg/cm ² at the pressure of the gauge 7). . Next, when the state of the cleaning liquid discharged from the cleaning nozzle 17 is visually checked, it is found that if the cleaning liquid is clogged with foreign matter, the cleaning liquid will not be discharged from the cleaning nozzle 17 or only a small amount will be discharged. Clogging can be easily confirmed.

As described above, according to the cleaning nozzle abnormality detection device of this invention, foreign matter clogging of the cleaning nozzle can be safely and easily detected without using a special device that takes up space such as a low-pressure pump.

[Brief explanation of the drawing]

The figure shows one embodiment of this invention, and is an overall view of a high-pressure washer. 1... High pressure pump, 2... Tank, 6... Discharge pipe, 8... Second stop valve, 9... Third stop valve, 10... Train valve, 11... Nozzle valve, 1
7...Washing nozzle, 35...Flow rate adjustment valve.

Claims (1)

[Scope of utility model registration request] A nozzle valve and cleaning liquid that are provided in a passage that connects a high-pressure pump that delivers cleaning liquid in a tank and a plurality of cleaning nozzles that discharge the cleaning liquid sent out from the pump, and that are opened when the cleaning liquid is discharged from the cleaning nozzles. In a high pressure washer having a drain valve that is opened when the cleaning liquid is not discharged from the cleaning nozzle and returns the cleaning liquid to the tank via the drain pipe, when one of the nozzle valves and the drain valve are opened at the same time, the cleaning liquid returns from the drain valve to the tank. An abnormality detection device for a cleaning nozzle, characterized in that the drain pipe is provided with a flow rate adjustment valve that can adjust the flow rate of the cleaning liquid.