JPH0683824B2 - Cleaning equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a cleaning device for injecting a high-pressure liquid into a tank such as a reaction tank to clean it.

[0002]

2. Description of the Related Art As a device for cleanly cleaning the inside of a reaction tank, brewing tank, fermentation tank, etc., a high-pressure cleaning liquid injection nozzle is attached to the tip of the piston rod of a cylinder standing upright at the opening of the tank, and a high-pressure cleaning liquid is supplied from the outside. It is known that the piston rod reciprocates by the reciprocating motion of the piston accompanying the supply and discharge of the cleaning liquid, that is, the cleaning liquid in the cylinder is supplied to the injection nozzle through the shaft hole of the piston rod while moving up and down the injection nozzle. (JP-A-2-332596).

[0003]

However, in the case of this cleaning device, the piston rod is expanded and contracted together with the high-pressure cleaning liquid, and the pressure of the cleaning liquid may reach 100 Kgf / cm ² or more. In order to withstand this high pressure, not only the thickness of the cylinder increases and the weight of the entire device increases, but also a pressure reducing valve with high pressure resistance is required to adjust the speed of the piston rod, which increases the cost of the device. There has occurred.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a cleaning device in which a low pressure fluid for driving a cylinder and a high pressure fluid for cleaning a tank are separated from each other. To do.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a piston is slidably housed in a cylinder to form pressure chambers on both sides of the piston, and a passage for supplying piston driving fluid is provided in these pressure chambers. A high pressure liquid passage is defined inside the piston rod connected to the piston rod, and a cleaning nozzle communicating with this high pressure liquid passage is provided at the end of the piston rod. A chamber is defined, and a high pressure liquid inlet is provided in the cylinder at a position communicating with the high pressure chamber at a predetermined position of the piston.

[0006]

Therefore, when the piston moves to a predetermined position, the high-pressure chamber on the side surface of the piston and the high-pressure liquid inlet on the side surface of the cylinder communicate with each other to supply the high-pressure cleaning liquid to the cleaning nozzle, while the piston is driven by the high-pressure liquid. Since the cleaning liquid is different from the cleaning liquid, a fluid having a lower pressure than that of the cleaning liquid can be used.

[0007]

1 to 3 show an embodiment of the present invention.

1 to 3, reference numeral 1 is a differential cylinder in which a piston 2 is slidably accommodated, and 3 is a piston rod formed by a tubular member connected to the piston 2. A cleaning nozzle 4 for injecting a high-pressure cleaning liquid is attached to the lower end of 3.

Air passages 12 and 13 communicating with air chambers 6 and 7 defined by a piston 2 are opened at the upper and lower ends of the outer peripheral side surface of the cylinder 1, respectively.
The piston 2 is driven by selectively supplying pressurized air to 2 or 13.

Pressurized air for driving the piston 2 is supplied from a pressurized air source 60, and the air passages 12 and 13 are connected to ports 62a and 62b of a directional control valve 62, respectively.
The direction switching valve 62 supplies pressurized air to the air chamber 6 or 7 and releases it to the atmosphere. An annular recess 2a having a predetermined depth is provided on the outer peripheral surface of the piston 2 formed of a columnar member, and a seal member 21 slidingly contacting the cylinder 1 is provided above and below the annular recess 2a. A high-pressure chamber 5 is defined between the inner circumference of the cylinder 1 and the annular recess 2a of the piston 2, and a through hole 22 opened in the annular recess 2a is provided inside the piston rod 3 connected to the lower surface of the piston 2. It communicates with the high-pressure water passage 30 provided.

The high pressure chamber 5 and the cleaning nozzle 4 are constantly communicated with each other through the through hole 22 and the high pressure water passage 30 to form an annular recess 2a.
The high pressure chamber 5 forms an independent passage that is not subjected to the pressure of the air chambers 6 and 7 above and below the piston 2 by the seal members 21 provided above and below.

At the bottom dead center of the piston 2, which is the extended position of the piston rod 3, the high-pressure water inlet 14 opening downward on the outer peripheral side surface of the cylinder 1 communicates with the high-pressure chamber 5 defined by the annular recess 2a, and the high-pressure water inlet 14 is a through hole 22 and a high pressure water passage 3
It communicates with the cleaning nozzle 4 via 0. This high pressure water inlet 1
4 is connected to a valve 51 which is controlled by a direction switching valve 64 and is opened and closed by pressurized air, and the valve 51 is connected to the bottom dead center of the piston 2.
When is opened, the high-pressure cleaning liquid supplied from the water pressure source 50 is jetted from the cleaning nozzle 4.

The cylinder 1 forms a thick wall portion 1a including the high-pressure water inlet 14, but the other portion becomes a thin wall portion 1b having a wall thickness corresponding to the introduced air pressure. The weight is reduced.

A lock pin 9 as an umbrella-shaped member for holding the contracted state of the piston rod 3 is projected on the upper surface of the piston 2, and the lock pin 9 is locked by an end lock 8 projecting from the upper end side surface of the cylinder 1 into the air chamber 6. Is locked at the top dead center position of the piston 2.

The end lock 8 is provided with a push rod 82 connected to a piston 80 and projects from the outer peripheral side surface of the cylinder 1 into the air chamber 6, while the piston 80 is slidably housed inside a lock cylinder 81. The piston 80 is biased by the spring 83 in the projecting direction and abuts against the bottom of the lock cylinder 81, so that the push rod 82 projects into the air chamber 6 to lock the lock pin 9. The air passage 1 is provided in the pressure chamber 84 formed at the bottom of the lock cylinder 81.
1 is opened, and this air passage 11 is connected to the direction switching valve 63. By supplying pressurized air under the control of the direction switching valve 63, the piston 80 is driven against the spring 83 in the contraction direction, and the end lock is performed. The end portion 8a of 8 is pulled to the inner peripheral surface of the cylinder 1, and the lock pin 9 is unlocked.

Proximity switches 40 and 41 are embedded in the outer peripheral side surfaces of the cylinder 1 corresponding to the top dead center and the bottom dead center of the piston 2, respectively, and are connected to a controller (not shown).
These proximity switches 40 and 41 are turned on when the piston 2 approaches, the proximity switch 41 is turned on at the bottom dead center of the piston 2, and the directional control valve 64 can be operated, and the proximity switch where the piston 2 is not at the bottom dead center. While 41 is off, the valve 51 cannot be opened, preventing high-pressure water from entering the air chamber 7.

With the above construction, the operation will be described below. In this device, the cleaning nozzle 4 of the cylinder 1 is directed downward and is erected at the upper opening position of the tank 70.

In the contracted state of the piston rod 3 where the tank 70 is not washed, the end portion 8a of the end lock 8 locks the lock pin 9 and keeps the piston rod 3 suspended.

To wash the tank 70, the directional control valve 6
3 is switched to supply pressurized air to the air passage 11 to move the end portion 8a of the end lock 8 in the pulling-out direction, and the holding of the lock pin 9 is released. Next, the direction switching valve 62 is switched to supply the pressurized air to the port 62b, while the port 62a is opened to the atmosphere.

The piston 2 extends its piston rod 3 downward by its own weight and the air pressure supplied to the air chamber 6, and the piston 2 is extended to the air chamber 7
While discharging the air from the port 62a, the piston 2 descends to the bottom dead center. When the piston 2 reaches the bottom dead center, the high pressure water inlet 14 and the high pressure chamber 5 defined by the piston 2 communicate with each other, and the proximity switch 41 is turned on so that the directional control valve 64 can be operated. At the extended position of the piston rod 3, the cleaning nozzle 4 descends to the vicinity of the center of the tank 70. In this state, when the direction switching valve 64 is switched to supply pressurized air and the valve 51 is opened, it is supplied from the water pressure source 50. The high-pressure cleaning liquid is sprayed from the cleaning nozzle 4 through the high-pressure chamber 5 and the high-pressure water passage 30, and the inside of the tank 70 is cleaned.

When the piston 2 starts descending, the directional control valve 63 is switched to stop the supply of pressurized air to the end lock 8. Proximity switch 40
Can be confirmed by turning off, and the directional control valve 63 can be operated manually or by a control device (not shown).

On the other hand, in order to contract the piston rod 3 after the cleaning work is completed, first, the direction switching valve 64 is switched to close the valve 51 to stop the supply of the cleaning liquid. Next, the direction switching valve 62 is switched to supply the pressurized air to the port 62a to open the port 62b to the atmosphere, and the pressurized air is sent to the air chamber 7 to raise the piston 2 and the air in the air chamber 6 is moved to the port 62b. Eject more.

When the piston 2 approaches the top dead center, the taper head 9a of the lock pin 9 pushes the end lock 8 toward the outside of the cylinder 1 to pass therethrough, and at the top dead center of the piston 2, the end 8a of the end lock 8 is reached. Rushes into the neck portion 9b and regulates the downward displacement of the lock pin 9.

The arrival of the piston 2 at the top dead center can be confirmed by turning on the proximity switch 40. In this state, the direction switching valve 62 is switched to stop the supply of the pressurized air to the air chamber 7. The piston 2 cannot descend because the lock pin 9 is locked by the end lock 8, and therefore the piston rod 3 is held in a state of being hung by the end lock 8,
The cleaning nozzle 4 is housed in the upper opening of the tank 70, and the next operation can be performed.

In this way, the high pressure chamber 5 is defined between the side surface of the piston 2 and the inner circumference of the cylinder 1, and the air chambers 6 and 7 for driving the piston 2 and the high pressure chamber 5 to which high pressure water is applied.
Since the piston 2 can be driven by the low-pressure pressurized air source 60, the pressure resistance of the cylinder 1 can be set low, and a thin cylinder body can be adopted to reduce the weight. Therefore, it becomes possible to reduce the cost of the device by eliminating the need for a directional switching valve having high pressure resistance.

Further, since the proximity switches 40 and 41 are embedded in a predetermined position of the cylinder 1, the tank 7 which cannot be visually confirmed.
The top dead center or the bottom dead center of the piston 2 can be easily detected inside 0, and the injection position of the cleaning nozzle 4 and the contracted position of the piston rod 3 can always be maintained at an accurate position.

Although the piston 2 is driven by the pressurized air in the above embodiment, a hydraulic pressure source may be connected instead of the pressurized air source 60 to drive the piston 2 by hydraulic pressure.

[0028]

As described above, according to the present invention, the high-pressure chamber is defined between the side surface of the piston and the inner circumference of the cylinder, and the fluid for driving the piston and the high-pressure chamber to which high-pressure water pressure is applied are separated. Therefore, the piston can be driven by low-pressure fluid, and the weight of the cylinder can be reduced by setting the pressure resistance of the cylinder to a low value and using a thin-walled member. It is possible to reduce the price of.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a cylinder showing a cleaning position where a piston rod is extended.

FIG. 3 is a cross-sectional view showing a cylinder erected on a tank.

[Explanation of symbols]

 2 Piston 2a Annular recess 4 Cleaning nozzle 5 High pressure chamber 8 End lock 9 Lock pin 11, 12, 13 Air passage 14 High pressure water inlet 30 High pressure water passage

Claims (1)

[Claims] A piston is slidably accommodated in a cylinder to form pressure chambers on both sides of the piston, and a passage for supplying a piston driving fluid is provided in these pressure chambers, and the passage is provided inside a piston rod connected to the piston. A high pressure liquid passage is defined, and a cleaning nozzle communicating with this high pressure liquid passage is provided at the end of the piston rod, and a high pressure chamber is defined between the recessed portion provided on the side surface of the piston and the cylinder. A cleaning device, characterized in that a high pressure liquid inlet is provided at a position communicating with the high pressure chamber at a predetermined position of the piston.