JPH0137948B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an endoscope cleaning device that can selectively supply cleaning water and chemical solutions to a cleaning tank.

Generally, endoscope cleaning devices are known that are capable of not only simply cleaning the endoscope with cleaning water, but also disinfecting the endoscope with a chemical solution after cleaning. In the case of disinfection using a chemical solution, a method of storing the chemical solution in a cleaning tank and immersing the endoscope for a predetermined period of time has come to be widely used. In such a cleaning device, it is necessary to be able to selectively supply cleaning water and a chemical solution to a cleaning tank in which an endoscope is accommodated. Therefore, the cleaning tank is connected via piping to a water supply tank containing cleaning water and a chemical solution tank containing a chemical solution via fluid control equipment such as a pump and a switching valve. In addition, since the water supply tank is designed to be supplied with cleaning water from a water supply source such as a water supply via a switching valve, when the cleaning water overflows due to a malfunction of the switching valve, the excess water is transferred to the cleaning tank. It is being considered that the water will be drained away.

Therefore, when a chemical solution is stored in the cleaning tank and the endoscope is immersed for disinfection, it is necessary to ensure that the disinfection is performed unless it is detected whether a predetermined amount of the chemical solution is supplied to the cleaning tank. I can't. moreover,
During immersion disinfection, if the overflowing water from the water supply tank is discharged into the cleaning tank and the water level rises as described above, unless this is detected and the liquid in the cleaning tank is immediately drained, the cleaning water will be removed from the cleaning tank. This could lead to a serious accident due to the liquid overflowing.

This invention has been made based on the above circumstances, and its object is to provide a water level detection device having two contact portions for detecting different water levels in the cleaning tank, so that a predetermined amount of liquid can be supplied to the cleaning tank. An object of the present invention is to provide an endoscope cleaning device capable of detecting whether liquid is being supplied and whether liquid is being supplied above a predetermined level.

An embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 in FIG. 1 is a main body of an endoscope cleaning apparatus, and inside the main body 1 of the apparatus there is provided a cleaning tank 2 (shown in FIG. 4) having an open top surface. The opening of the cleaning tank 2 is covered by a cover 3 that can be opened and closed.
is blocked by. By installing an endoscope (not shown) inside the cleaning tank 2, this endoscope can be automatically cleaned and disinfected using cleaning water or a chemical solution as described later. .

An endoscope fixing site 4 consisting of a recess is provided at the left end of the front end of the top surface of the device body 1, and this fixing site 4 is used to clean and disinfect an endoscope whose insertion section can only be cleaned. When doing so, the operating section is installed. Further, in the vicinity of the fixed part 4, there are a plurality of supply ports 5 connected to the operation part installed in the fixed part 4 by a tube (not shown) for supplying cleaning water and chemical solutions to the channel of the endoscope. ...is provided. Furthermore, in an endoscope that can be completely cleaned, the operation section is also installed in the cleaning tank 2, so the supply port 5 used at that time
... are provided in the cleaning tank 2.

Further, a main panel section 6 constituting an operation panel is provided at the right end of the front end of the top surface of the device main body 1, and a sub-panel section 8 is installed at the upper front of the device main body 1 below this main panel section 6. has been done. As shown in FIG. 2, the main panel section 6 is provided with switches and displays that are used relatively frequently. As switches, a cleaning switch 10, a disinfection switch 11, an overnight switch 12, a stop switch 13, a start switch 14, and a leakage inspection switch 15 are provided. Further, near the upper part of each switch 10, 11, 12, 14, 15 except for the stop switch 13, there are display lamps 16, 17, 18, which indicate when each switch is operated.
19 and 20 are provided. The main panel section 6 is also provided with display sections 21a and 21b that display the water washing process and air blowing process during cleaning, and display sections 21c and 21d that display the water washing process and air blowing process during disinfection. Display lamps 2 are provided above the display sections 21a to 21d.
2, 23, 24, 25, and 26 are provided.
Note that the display lamp 24 is for displaying the disinfection process. Furthermore, the main panel section 6 is provided with a time display 27 consisting of a 4-digit LED that displays the remaining time of the process operation, and the upper right side displays the information when an abnormal situation occurs during the process operation. An abnormality lamp 28 is provided. All of the switches mentioned above are touch-type switches that can be operated simply by touching them, and are also seat-type switches whose external shapes do not protrude from the surface of the main panel section 6. Further, the display devices are also provided so as not to protrude from the surface of the main panel section 6. In other words, the surface of the main panel portion 6 is configured to have a flat shape.

On the other hand, as shown in FIG. 3, the sub-panel section 8 has switches such as a push-button power switch 31, a flush time setting timer 32 consisting of a click-type dial switch, and a disinfection time setting timer 3.
3. A manual switch 34 consisting of a two-action switch, an air switch 35, and a discharge switch 36 for discharging the chemical solution in the cleaning tank 2.
is provided. The tour switch is turned on by the first operation and turned off by the second operation. In this way, since the sub-panel section 8 is mainly installed with items that are used less frequently, this sub-panel section 8 is installed in the main body of the device.
Even if it is located at the back of the front part of the machine, it will not cause any trouble in use.

Next, the internal structure of the device main body 1 will be explained based on FIG. 4. There is a water tank 4 inside the device body 1.
0, a detergent tank 41 and a chemical tank 42 are provided. The upper part of the water supply tank 40 has a filter 4
3 and a first switching valve 44 to a tap water faucet 45 that is a water supply source. Furthermore, a first water level detection device 46 is provided within the water supply tank 40 . This first water level detection device 46 has first to third contact portions 47a, 47b, and 47c that detect water levels at different heights, and these contact portions 4
Various devices are controlled as described later by the on/off states of 7a, 47b, and 47c. Additionally, a communication pipe 48 is provided at the top of the water tank 40.
is connected at one end. The other end of this communication pipe 48 communicates with the cleaning tank 2, and is designed to vent air in the water supply tank 40 and to release cleaning water to the cleaning tank 2 when too much cleaning water is supplied to the water supply tank 40. Further, a water supply pipe 49 is connected to the bottom of the water supply tank 40. This water supply pipe 49 communicates with a first liquid pump 51 via a second switching valve 50. Further, the midway portion of the water supply pipe 49 is connected to the detergent tank 41 via a third switching valve 52 and an orifice 53, and is further provided in the cleaning tank 2 via a second liquid pump 54 and a filter 55. It is connected to a rotating nozzle 55. This rotating nozzle 55 is adapted to be rotationally driven by a first motor 56.

Furthermore, a second water level detection device 57 is provided within the chemical liquid tank 42 . This second water level detection device 57 has first to third contact portions 58a, 58b, and 58c that detect water levels of different heights of the chemical liquid stored in the chemical liquid tank 42, and these contact portions 5
Various devices are controlled as described later by the on/off states of 8a, 58b, and 58c. The bottom of the chemical solution tank 42 is connected to a fourth switching valve 5.
It communicates with the first liquid pump 51 via 9. Further, a fifth switching valve 61 having three positions is connected to the upper part of the chemical tank 42 and is switched by a second motor 60 via a cam (not shown). That is, the fifth switching valve 61 is formed with two outflow ports and one inflow port, and the chemical solution tank 42 is connected to one of the outflow ports. A drain pump 62 is connected to the other outflow port, and the inflow port is connected to the bottom of the cleaning tank 2. The fifth switching valve 61 is in the first state in which the cleaning tank 2 and the chemical tank 42 are in communication with each other, and in the cleaning tank 2
A second state in which the outflow of liquid from the drain pump 62 is blocked and a third state in which the cleaning tank 2 and the drain pump 62 are communicated are switched.

Further, a sixth switching valve 63 is connected to the discharge side of the first liquid pump 51. This sixth switching valve 63 has two outlet ports, one of which communicates with the cleaning tank 2 and the other of which is connected to the mixing header 65 via the first check valve 64 . The mixing header 65 is connected to the discharge side of the second liquid pump 54 via a second check valve 66 and to a first air pump 68 via a third check valve 67. has been done. A seventh switching valve 69 is connected between the first air pump 68 and the third check valve 67, and only when the seventh switching valve 69 operates in the closed state Compressed air is supplied to the mixing header 65. Furthermore, the mixing header 65 has a device main body 1.
A supply port 5 similar to the supply port 5 provided on the outside of the
is provided, and when cleaning the endoscope, which is entirely washable, a channel 70 of the endoscope is connected to the supply port 5.
are now connected.

Further, a third water level detection device 71 is provided within the cleaning tank 2. This third water level detection device 71 has a first contact portion 72a and a contact portion 72b that detect water levels at different heights.
Various devices are controlled as described later by the on/off states of a and 72b.

Furthermore, a second air pump 73 is provided within the device main body 1. This second air pump 7
3 is supplied into the endoscope through a relief valve 74 and a connection port (not shown) provided in a connector 75 of a universal cord of the endoscope. Therefore, if compressed air is supplied while the entire endoscope is immersed in cleaning water in the cleaning tank 2,
If a hole is made in the outer skin of the endoscope, this can be detected by the air leaking through the hole. In addition, if compressed air is supplied when cleaning or disinfecting the endoscope, even if a hole is made in the outer skin of the endoscope, cleaning water or chemicals can be prevented from entering the inside through the hole. .

On the other hand, the first to third contact portions 47a, 47b, and 47c of the first water level detection device 46 are connected to a CPU 76 as a control portion, as shown in FIG. If the first contact portion 47a is on before starting the cleaning device, it means that the water supply tank 40 is sufficiently supplied with cleaning water. The switching valve 44 is closed. When the cleaning device is started and the cleaning process begins, the water level in the water tank 40 decreases. Then, when the second contact portion 47b is turned off, the first switching valve 44 is opened by the CPU 76 in response to the signal, and cleaning water is supplied to the water supply tank 40. That is, the water level of the water supply tank 40 is between the first contact portion 47a and the second contact portion 47b.
controlled between. Furthermore, if the second contact portion 47b is off before starting the cleaning device, it means that the water necessary for the cleaning process is not stored in the tank 40 in advance, so at that time the CPU 7
The cleaning device cannot be started by a signal from 6. Furthermore, the third
When the contact portion 47c is turned off during the cleaning process, etc., it indicates that there is no cleaning water in the water supply tank 40, so a signal is output from the CPU 76 and the first liquid pump 51 and the first liquid pump 51 are turned off. 2
The liquid pump 54, the first motor 56, the drain pump 62, and the first air pump 68 are stopped, and the second
The motor 60 causes the fifth switching valve 61 to shut off the cleaning tank 2, and the second switching valve 50, third switching valve 52, and fourth switching valve 59 to close. Change. That is, the cleaning device is stopped. Further, at this time, the abnormality lamp 28 provided on the main panel section 6 lights up, and a buzzer (not shown) sounds to indicate this.

Further, the first to third contact portions 58a, 58b, and 58c of the second water level detection device 57 are connected to the CPU 76, which is a control portion, as shown in FIG. This first contact portion 58a detects an abnormal rise in the water level in the chemical tank 42 (due to inflow of cleaning water, etc.), so if the first contact portion 58a is on before operating the cleaning device, The disinfection process cannot be started by a signal from the CPU 76.
Also, when it is turned on during chemical recovery during the cleaning process, the first switch is activated by a signal from the CPU 76.
liquid pump 51, second liquid pump 54, first
The motor 56, the drain pump 62, and the first air pump 68 are stopped, and the second motor 60 causes the fifth switching valve 61 to shut off the cleaning tank 2, and the second switching valve 52, fourth switching valve 59
switches to the closed state. That is, the cleaning device is stopped. Further, at this time, an abnormality lamp 58 provided on the main panel section 6 lights up, and a buzzer (not shown) sounds to indicate this. Further, the second contact portion 58b is connected to the chemical liquid tank 42.
It is normal when it is turned on before the chemical solution is transferred to cleaning tank 2 and the immersion sterilization process is started, but if it is turned on after the immersion sterilization process is started, except during the chemical recovery process, the chemical solution is This is because the chemical liquid leaks from the cleaning tank 2 into the tank 42 and the water level rises, so various devices are controlled in the same way as when the first contact part 58a is turned on midway, and the cleaning device stops and the abnormality is detected. The lamp 28 lights up and the buzzer sounds. However, at this time, the drain pump 62 is stopped, and the fifth switching valve 61 is placed in a state where the cleaning tank 2 and the chemical solution tank 42 are communicated with each other, that is, a state in which the disinfection process is interrupted and the chemical solution is recovered. Furthermore, if the second contact portion 58b is off from the beginning, it means that there is not enough chemical solution in the chemical solution tank 42 to sterilize the endoscope by immersing it.
The disinfection process cannot be started by a signal from 76. Furthermore, the third contact portion 58c
When the water level of the chemical solution tank 42 is above a predetermined level during the disinfection process and the switch is turned on, that is, after a predetermined amount of the chemical solution is supplied to the cleaning tank 2 and the switch is turned off once,
When the chemical liquid leaks from the cleaning tank 2 into the chemical liquid tank 42, various devices are controlled by signals from the CPU 76 and the operation of the cleaning device is stopped, in the same way as when the first contact part 58a is turned on midway. .

Further, the first contact section 72a and the second contact section 72b of the third water level detection device 71 are connected to a CPU 76 which is a control section, as shown in FIG. The first contact part 72a detects when the water level in the cleaning tank 2 has risen abnormally. When the first contact part 72a is turned on during the disinfection process, the second motor 60 , the fifth switching valve 61 is switched to communicate the cleaning tank 2 and the drain pump 62, and the drain pump 62 is operated to discharge the liquid in the cleaning tank 2. At this time, among other devices, the first liquid pump 51 is stopped and the fourth switching valve 59 is closed. Furthermore, the second contact portion 72b
is for detecting the appropriate water level in the cleaning tank 2. When turned on during the disinfection process, it means that the chemical solution has been supplied to the cleaning tank 2 at the appropriate water level, so the fourth switching valve 59 is closed and the first liquid is turned on. Pump 51 stops. Additionally, when a predetermined amount of chemical solution is supplied to the cleaning tank 2 during the disinfection process, it is turned on, and then turned off, there is a possibility that the chemical solution is leaking from the cleaning tank 2 to the chemical tank 42 or the drain pump 62 side. Therefore, at this time, various devices are controlled to stop the cleaning device in the same way as when the first contact portion 58a of the second water level detection device 57 is turned on during the disinfection process.

Next, a process of cleaning and disinfecting an endoscope using the cleaning device will be described. First, an endoscope is installed in the cleaning tank 2, and if the entire endoscope can be cleaned and disinfected, the entire endoscope is installed in the cleaning tank 2. Then, the various channels 70 of the endoscope and the supply port 5 are connected with a tube (not shown). Further, a second air pump 73 is connected to a connection port provided in a connector 75 for leakage testing of the endoscope through a tube (not shown). When such preparations are completed, the power switch 31 of the sub-panel section 8 is turned on with the cover 3 open to make it ready for operation.
Next, turn on the leakage test switch 1 on the main panel section 6.
When 5 is pressed, the indicator lamp 20 on the main panel section 6 lights up immediately, indicating that a leak test is in progress. This display will remain lit until all leak tests are completed. At the same time, the second motor 60 operates to close the fifth switching valve 61, and the cleaning tank 2
cut off. Note that the switching operation of this fifth switching valve 61 is properly regulated by a limit switch incorporated therein. In this way, cleaning tank 2
Immediately after the outflow of air is completely blocked, the second air pump 73 starts operating and supplies compressed air to the internal space of the endoscope. On the other hand, when a certain period of time _T1 has elapsed after the second air pump 73 is activated, the second switching valve 50 opens and the sixth switching valve 6
3 is switched to the state where it communicates with the cleaning tank 2 side, and the first liquid pump 51 is further activated. Therefore,
The second detection unit 72b of the third water level detection device 71 provided in the cleaning tank 2 detects the cleaning water in the water supply tank 40.
is supplied until it turns on. In this way, when water is poured into the cleaning tank 2, the entire endoscope installed in the cleaning tank 2 is submerged in water. Since the inside of this endoscope is pressurized with compressed air as described above, if there is a leakage point such as a crack or pinhole on the outside of the endoscope, air bubbles will be ejected from there.
Therefore, by observing and confirming this, the location of the leak can be discovered.

Also, turn on the leak test switch 1 again within the predetermined time.
If 5 is pressed, the operating time will be extended, but if it is not pressed, the second motor 60 will automatically operate after a predetermined period of time has passed, and the fifth switching valve 61 will be switched to the discharge side, and this switching will be completed. After drain pump 6
2 is activated and the water in the cleaning tank 2 is discharged. Also,
Although the second air pump 73 also stops, the pressurized state of the internal space of the endoscope continues for a while. When all of the water in the cleaning tank 2 has been drained, an end buzzer sounds to notify you of this.

Next, the operations of the cleaning process using cleaning water and the disinfection process using chemical solution will be explained. When only the cleaning process is selected, only that cleaning process is performed, but when the disinfection process is selected, the cleaning process is performed as a pre-process. Therefore, the case where the disinfection process is selected will be explained. First, wash time setting timer 3
2 and the disinfection time setting timer 33 to a predetermined time, and then turn on the start switch 14.
The display lamp 19 lights up, and the remaining time of the entire process is displayed on the time display 27. Also, the second
The motor 60 operates to switch the fifth switching valve 61 to the discharge side. Immediately after this, the second liquid pump 5
1 is activated, and the first motor 56 is activated to rotate the rotary nozzle 55. At the same time, the seventh switching valve 69 is switched to close and the first air pump 68 is activated. Therefore,
In the various channels 70 of the endoscope, cleaning water sent from the water supply tank 40 by the second liquid pump 54 and compressed air sent from the first air pump 68 are mixed in a mixing header 65. sent. That is, since a so-called bubble flow is sent into the channel 70, the channel 70 can be effectively cleaned. In addition, water tank 4
The cleaning water of 0 is also sent to the rotary nozzle 55 by the first air pump 68, and the cleaning water is sprayed onto the surface of the endoscope in the cleaning tank 2.

On the other hand, a detergent can also be added to the washing water in this washing step. When adding detergent, turn on the detergent switch 10 before turning on the start switch 14. Then, the third switching valve 52 is opened for a predetermined time according to the washing time set by the washing time setting timer 32, and the detergent in the detergent tank 41 is added to the washing water, so that so-called detergent washing is performed. For example, flush time setting timer 3
If 2 is set to 3 minutes, the detergent is added for the first minute at the same time as the start of washing, and when the time is 5 minutes, the detergent is added for only 2 minutes after 1 minute has passed after the start of washing. Furthermore, when the time is 6 minutes, detergent is added for 3 minutes after 1 minute has passed since the start of washing. That is, when the detergent switch 10 is turned on, the time for adding detergent is automatically set according to the washing time set by the washing time setting timer 32, and only washing water is always supplied after washing with detergent. A so-called rinsing process is performed for a certain period of time to remove detergent.

When this rinsing process is completed, the second liquid pump 54 is stopped, and the supply of washing water is stopped. At the same time, the first motor 56 stops, and the rotation of the rotary nozzle 65 stops. However, the first air pump 68 continues to operate for a certain period of time to supply only air into the channel 70 of the endoscope and discharge the cleaning water remaining therein. In addition, the drain pump 62
operates until the cleaning water in the cleaning tank 2 is completely exhausted and then stops automatically.

The above is the cleaning process, and if only the cleaning process is selected, the process ends here. However, when the disinfection switch 11 is pressed to select the disinfection process, the disinfection process is performed following the cleaning process.

That is, the second motor 60 is operated and the fifth switching valve 61 is switched to the cutoff state. Immediately after this, the fourth switching valve 59 opens, and the first liquid pump 5
1 is activated, the chemical liquid in the chemical liquid tank 42 is supplied to the cleaning tank 2. When the endoscope is sufficiently immersed in the chemical solution, the second contact portion 72b of the third water level detection device 71 turns on to detect this, and this detection signal is input to the CPU 76.
This causes the sixth switching valve 63 to switch, supplying the chemical solution to the channel 70 of the endoscope. and,
When the channel 70 is filled with the chemical liquid and the third contact portion 58c of the third water level detection device 57 is turned off, the fourth switching valve 59 is closed and the first liquid pump 51 is stopped. That is, not only the outer surface of the endoscope but also the inside of the channel 70 is immersed and sterilized in the chemical solution.

Then, when the time set by the disinfection time setting timer 33 has elapsed, the chemical solution recovery operation is performed. That is, the second motor 60 operates to switch the inlet of the fifth switching valve 61 to the chemical tank 42, and the chemical in the cleaning tank 2 is returned to the chemical tank 42, and the first air pump 6
8 is activated to also discharge and collect the chemical liquid that has entered the channel 70 of the endoscope.

When this collection is completed, the second motor 60 is operated again and the fifth switching valve 61 is switched to the discharge side.
Drain pump 62 starts operating. At the same time, the first air pump 68 and the second liquid pump 54 are activated to perform the same rinsing operation as described above, that is, to perform water rinsing using a bubble flow without adding detergent. Not only the outer surface of the channel 70 but also the inside of the channel 70 is rinsed. When this rinsing process is completed, the second liquid pump 54 is stopped and only the first air pump 68 is operated intermittently to drain the channel 70.

In addition, in the above disinfection process, the disinfection switch 11
When the overnight switch 12 is turned on instead, the endoscope is immersed in the chemical solution for a long time, for example, about 10 hours, and then the above-mentioned rinsing step and draining step are performed. Such overnight disinfection is used to reliably disinfect endoscopes with excellent chemical resistance.

On the other hand, the above-mentioned washing and draining can be carried out by turning on the manual flushing switch 34 or air switch 35 provided on the sub-panel section 35, and when replacing the chemical in the chemical tank 42, the drain switch 36 can be turned on. When turned on, the first liquid pump 51 and the drain pump 6 are turned on.
2, fourth, fifth, and sixth switching valves 59, 61, 63
is activated and the chemical solution is discharged.

By the way, according to the cleaning device having the above configuration, there are two different water levels in the cleaning tank 2, that is, the first and second contact portions 72a that detect that the water level of the cleaning tank 2 has risen abnormally and that it is appropriate. , 72b was provided. Therefore,
When it is necessary to store a predetermined amount of cleaning water or a chemical solution in the cleaning tank 2, such as when inspecting endoscopes for leaks or immersing them in a chemical solution for disinfection, the water level in the cleaning tank 2 must reach a predetermined level. The contact portion 72b of No. 2 detects this, and the supply of cleaning water and chemical solution is stopped in response to this detection signal. Therefore, the water level of the cleaning water or chemical solution in the cleaning tank 2 can be automatically maintained at an appropriate level, so that the above-mentioned leakage inspection and immersion disinfection can be performed reliably and quickly.

Furthermore, during leakage inspection or immersion disinfection, the first switching valve 44 or the first water level detection device 46 that controls the supply of cleaning water to the water supply tank 40 may fail, causing the cleaning water to continue to be supplied. When the cleaning water overflowing from the water supply tank 40 flows into the cleaning tank 2 through the communication pipe 48, the water level in the cleaning tank 2 rises abnormally. In such a case, the abnormally raised water level is detected by the first contact portion 72a of the third water level detection device 71.
is detected, and this detection signal is input to the CPU 76. Then, the drain pump 62 is operated by the output from the CPU 76 and the fifth switching valve 61 is switched to the discharge side, so that the liquid in the cleaning tank 2 is discharged. liquid will not overflow. Further, at this time, the operation of the cleaning device is stopped and the occurrence of an abnormality is notified by the abnormality lamp 28 or a buzzer, so that subsequent measures can be taken reliably and quickly.

As described above, in the present invention, a water level detection device having two contact portions for detecting different water levels in the cleaning tank is provided in a cleaning tank to which cleaning water and chemical solution are selectively supplied. The contact portion can detect whether the water level in the cleaning tank has risen abnormally or has become appropriate. Therefore, when storing cleaning water or chemical solution in the cleaning tank, the water level at that time can be reliably brought to the appropriate level by adjusting the eye movement, and at that time, the cleaning water overflows from the water supply tank and is stored in the cleaning tank. Even if the water level constantly rises, this can be reliably detected and the liquid can be discharged from the cleaning tank.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a perspective view of the cleaning device, Fig. 2 is a plan view of the main panel section, Fig. 3 is a plan view of the sub-panel section, and Fig. 4 is the inside of the cleaning device. Piping system diagram of equipment installed in
Figure 5 is an explanatory diagram of the operation of the first water level detection device;
The figure is an explanatory diagram of the operation of the second water level detector, Figure 7 is an explanatory diagram of the operation of the third water level detector, Figure 8 is a time chart during endoscope leakage inspection, and Figure 9 is the cleaning process. It is a time chart diagram of the disinfection process and the disinfection process. 2...Cleaning tank, 71...Water level detection device (3rd
), 72a...first contact portion, 72b...second
contact part.

Claims (1)

[Claims] 1. A water supply tank that stores cleaning water, a chemical tank that stores chemical solutions, a cleaning tank that selectively supplies cleaning water and chemical solutions from these tanks, and discharges the cleaning water or chemical solution stored in this cleaning tank. a water level detection device having a switching valve, a first contact portion for detecting that the water level in the cleaning tank is normal, and a second contact portion for detecting that the water level is abnormal;
A communication pipe having one end communicating with the water supply tank and the other end communicating with the washing tank, through which washing water overflowing from the water supply tank flows into the washing tank, and washing water flowing into the washing tank through the communication pipe. and a control unit that operates the switching valve to the discharge side in response to a signal from the second contact unit that detects this and when the water level rises abnormally. .