JPH0683825B2 - 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 cleaning nozzle for injecting a high-pressure cleaning liquid is attached to the tip of a piston rod of a cylinder that is erected in the opening at the top of the tank. It is known that the piston rod expands and contracts by the reciprocating motion of the piston accompanying the supply and discharge of the high-pressure cleaning liquid, that is, the cleaning liquid in the cylinder is supplied to the cleaning nozzle through the shaft hole of the piston rod while moving up and down the cleaning nozzle. (JP-A-2-332596)
Issue).

[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 apparatus increases, but also a pressure reducing valve having a high pressure resistance is required to adjust the speed of the piston rod, which increases the cost of the apparatus.

Sealing members such as packings are housed in the vicinity of the inlet / outlet of the tank to be cleaned, so that these sealing members will not be damaged by the high-pressure cleaning liquid.
It is necessary to start the injection of the cleaning liquid after the cleaning nozzle has surely passed through the entrance and exit, and it is necessary to inject or stop the cleaning liquid at an arbitrary position.

Therefore, the present invention has been made to solve the above problems, and separates a circuit of a low pressure fluid for driving a cylinder and a high pressure fluid for cleaning a tank, and a cleaning fluid at an arbitrary position. An object is to provide a cleaning device that can be sprayed.

[0006]

SUMMARY OF THE INVENTION According to the present invention, pressure chambers are formed on both surfaces of a piston slidably accommodated in a cylinder, and passages for supplying piston driving fluid are provided in these pressure chambers, respectively, and connected to the piston. Through a shaft hole for supplying high-pressure fluid to the inside of the piston rod, and at the end of the piston rod, a cleaning nozzle communicating with this shaft hole is provided, and a cylinder is provided with a high-pressure fluid inlet, which communicates with this high-pressure fluid inlet. At the same time, a hollow rod that is slidably inserted into the shaft hole of the piston rod is disposed inside the cylinder coaxially with the shaft hole.

[0007]

Therefore, the piston is driven by the fluid having a desired pressure supplied to the pressure chamber to expand and contract the piston rod, while the high-pressure cleaning liquid supplied from the high-pressure fluid inlet of the cylinder is supplied to the inside of the hollow rod and the piston rod. Is supplied to the cleaning nozzle through the shaft hole, and the cleaning liquid can be constantly supplied within a predetermined stroke range of the piston because the hollow rod penetrates the piston and is inserted into the shaft hole of the piston rod.

[0008]

1 to 3 show an embodiment of the present invention.

1 to 3, reference numeral 1 is a differential type 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, and the piston rod A cleaning nozzle 4 for injecting a high-pressure cleaning liquid is attached to the lower end of 3.

Air passages 11 and 12 communicating with the pressure chambers 6 and 7 defined by the piston 2 are opened at the upper and lower ends of the outer peripheral surface of the cylinder 1, respectively.
The piston 2 is driven by selectively supplying pressurized air to 1 or 12.

Pressurized air for driving the piston 2 is supplied from a pressurized air source 60, and the air passages 11 and 12 are connected to ports 62a and 62b of a directional control valve 62, respectively.
The direction switching valve 62 supplies pressurized air to the pressure chamber 6 or 7 and releases it to the atmosphere.

A high-pressure water passage 30 is formed by axially penetrating the piston 2 and a piston rod 3 connected to the lower surface of the piston 2, and the cleaning nozzle 4 attached to the end of the piston rod 3 and the high-pressure water passage 30 are connected to each other. Communicate.

A hollow rod 5 is erected coaxially with the piston rod 3 from the upper end of the air chamber 6 inside the cylinder 1. A high-pressure water passage 50 is formed inside the hollow rod 5, and the high-pressure water inlet 14 opened at the upper end of the outer peripheral side surface of the cylinder 1 communicates with the high-pressure water passage 50.

The hollow rod 5 is formed of a cylindrical member,
The lower end of the hollow rod 5 has a bottom portion of the air chamber 7 corresponding to the bottom dead center of the piston 2 so that the communication state of the high pressure water passage 30 and the high pressure water passage 50 is maintained even if the piston 2 moves to the bottom dead center. It has reached the vicinity.

The hollow rod 5 is inserted into the high pressure water passage 30 of the piston 2 and the piston rod 3, and the high pressure water passage 3 is inserted.
The inner diameter of 0 is set to a predetermined fit that is freely slidable with respect to the outer diameter of the hollow rod 5, and the seal member 21 provided on the inner periphery of the upper portion of the high-pressure water passage 30 is brought into sliding contact with the hollow rod 5 to generate a high pressure. Leakage of the cleaning liquid passing through the water passage 30 into the pressure chamber 6 is prevented.

The hollow rod 5 penetrating the piston 2 allows the high-pressure water inlet 14 and the cleaning nozzle 4 to communicate with each other at all times via the high-pressure water passage 30 and the high-pressure water passage 50, and the sealing member 2
1, even if the piston rod 3 expands and contracts, the high-pressure water passage 30
The high-pressure water passage 50 forms an independent passage that does not receive the pressure in the pressure chambers 6 and 7 above and below the piston 2.

The high-pressure water inlet 14 is connected to the direction switching valve 71, and when the direction switching valve 71 is opened, the high-pressure cleaning liquid supplied from the high-pressure water source 70 is passed through the high-pressure water passage 50 and the high-pressure water passage 30 to the cleaning nozzle 4. Jet from.

The high-pressure water inlet 1 is provided at the top of the cylinder 1.
The thick wall portion 1a including 4 is formed, but the other portion is the thin wall portion 1b having the wall thickness of the pressure resistance corresponding to the introduced air pressure, and the overall weight is reduced.

On the upper surface of the piston 2, an engaging portion 9 of an umbrella-like member consisting of a taper head 9a and a neck portion 9b for holding the contracted state of the piston rod 3 is projected, and the pressure chamber 6 from the side surface of the upper end portion of the cylinder 1. The locking portion 9 is locked at the top dead center position of the piston 2 by the end lock 8 projecting inward. The taper head 9a is formed in an umbrella shape with a predetermined inclination from the upper end of the locking portion 9, and is formed between the taper head 9a and the upper end surface of the piston 2 with an outer diameter smaller than the maximum outer diameter of the taper head 9a. And a cylindrical neck portion 9b.

The end lock 8 is provided with a push rod 82 connected to a piston 80 which is freely slidable in a lock cylinder 81. The piston 80 is biased by a spring 83 in a projecting direction so that the push rod 82 projects into the pressure chamber 6. While locking the neck portion 9b of the locking portion 9, the air passage 13 is opened in the pressure chamber 84 formed in the bottom portion of the lock cylinder 81,
This air passage 13 is connected to the direction switching valve 61, and by supplying pressurized air under the control of the direction switching valve 61, the piston 80 is driven in the contracting direction against the spring 83, and the end portion 8a of the end lock 8 is driven. Is pulled to the inner peripheral surface of the cylinder 1 to release the connection with the locking portion 9.

A magnet 40 is embedded in the outer peripheral side surface of the piston 2, while magnetic sensors 41 and 43 are fixedly mounted on the outer peripheral side surface of the cylinder 1 corresponding to the top dead center and the bottom dead center of the piston 2, and further cleaned. The magnetic sensor 42 is also fixed to the cylinder 1 at the stroke position of the piston 2 corresponding to the cleaning start position after passing through the inlet / outlet of the target tank 90, and each is connected to a control device (not shown).

These magnetic sensors 41, 42 and 43 are turned on when the magnet 40 of the piston 2 approaches, so that the position of the cleaning nozzle 4 can be accurately known. If the magnetic sensor 42 is turned on while the piston 2 is descending, the cleaning nozzle 4
Is at the cleaning start position, and by operating the directional control valve 71 here, it is possible to prevent the high-pressure cleaning liquid from damaging the seal member near the inlet and outlet of the tank 90 and start the cleaning. .

With the above construction, the operation will be described below. In this apparatus, the cleaning nozzle 4 of the cylinder 1 is erected at the upper opening position of the tank 90 with the cleaning nozzle 4 facing downward, and the inside of the tank 90 is cleaned when the cleaning nozzle 4 descends.

In the contracted state of the piston rod 3 where the tank 90 is not washed, the end portion 8a of the end lock 8 locks the locking portion 9 and keeps the piston rod 3 suspended.

To wash the tank 90, the direction switching valve 6
1 is switched to supply pressurized air to the air passage 13 to move the end 8a of the end lock 8 in the pulling-out direction to release the holding of the locking portion 9. Next, the direction switching valve 62 is switched to supply pressurized air to the port 62b, while the port 62b
Release a into the atmosphere.

The piston 2 extends its piston rod 3 downward by its own weight and the air pressure supplied to the pressure chamber 6, and the pressure chamber 7
While discharging the air from the port 62a, the piston 2 descends to the bottom dead center. During this descent, when the magnetic sensor 42 detects the magnet 40 of the piston 2, a detection signal is sent to a control device (not shown) so that the cleaning start position where the cleaning nozzle 4 has passed through the inlet / outlet of the tank 90 can be known. The switching valve 71 can be operated. When the direction switching valve 71 is opened here, the high-pressure cleaning liquid supplied from the high-pressure water source 70 passes through the high-pressure water passage 50 and the high-pressure water passage 30 and is ejected from the cleaning nozzle 4 to be provided at the upper opening position of the tank 90. Cleaning can be started without damaging the seal member.

While descending from the cleaning start position to the bottom dead center of the piston 2, the direction switching valve 71 can be operated to perform cleaning at any position.

At the most extended position of the piston rod 3, which is the bottom dead center of the piston 2, the magnetic sensor 43 is turned on,
It can be known that the cleaning nozzle 4 is at the deepest position in the tank 90.

When the piston 2 starts to descend, the direction switching valve 61 is switched to stop the supply of pressurized air to the end lock 8.

On the other hand, in order to contract the piston rod 3 after the cleaning work is completed, first, the direction switching valve 71 is switched and closed to stop the supply of the cleaning liquid. Next, the directional control valve 6
2 is switched to supply pressurized air to the port 62a to open the port 62b to the atmosphere, and pressurized air is sent to the pressure chamber 7 to raise the piston 2 and the air in the pressure chamber 6 is moved to the port 6
Discharge from 2b.

When the piston 2 approaches the top dead center, the taper head 9a of the locking portion 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 portion of the end lock 8 ends. 8a protrudes into the neck portion 9b and the locking portion 9
Regulate the downward displacement of. The arrival of the piston 2 at the top dead center can be confirmed by turning on the magnetic sensor 41. In this state, the direction switching valve 62 is switched to stop the supply of the pressurized air to the pressure chamber 7. The piston 2 cannot be lowered because the locking portion 9 is locked by the end lock 8. Therefore, the piston rod 3 is held in a state of being hung by the end lock 8, and the inside of the tank 90 has the cleaning nozzle 4 opened upward. It can be stored in its position and used for the following operations.

In this way, the high pressure water passage 50 of the hollow rod 5 and the high pressure water passage 30 of the piston rod 3 which freely slide through the piston 2 and the piston rod 3 are connected,
Since the pressure chambers 6 and 7 for driving the piston 2 are separated from the high-pressure water passage 30 and the high-pressure water passage 50 to which high-pressure water pressure is applied, the piston 2 can be driven by the low-pressure pressurized air source 60, and the cylinder 1 can withstand pressure. Can be set to a low value, and a thin cylinder body can be used to reduce the weight, which makes it possible to reduce the cost of the device by eliminating the need for a directional switching valve with high pressure resistance, and Rod 5
And piston rod 3 are allowed to slide freely, and high pressure water inlet 14
Since the cleaning nozzle 4 and the cleaning nozzle 4 are always communicated with each other, high-pressure water can be sprayed from the cleaning nozzle 4 at any stroke position of the cylinder 1 to perform cleaning.

While the magnet 40 is embedded in the piston 2, magnetic sensors 41, 42,
Since 43 is fixed, it is possible to easily detect the top dead center, the bottom dead center, or the cleaning start position of the piston 2 inside the tank 90 that cannot be visually confirmed, and to determine the injection position of the cleaning nozzle 4 and the contraction position of the piston rod 3. It is possible to maintain the correct position at all times.

Although pressurized air is used as the driving fluid for the piston 2 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.

[0035]

As described above, according to the present invention, since the inside of the hollow rod, which freely slides through the piston, communicates with the shaft hole of the piston rod, the fluid for driving the piston and the high-pressure water pressure are applied. The high pressure chamber can be separated and 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 low and using a thin member. Is unnecessary, the cost of the apparatus can be suppressed, and the high pressure fluid inlet and the cleaning nozzle are always in communication with each other, and the cleaning can be performed at any stroke position of the cylinder.

[Brief description of drawings]

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

FIG. 2 is a sectional view of a cylinder.

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

[Explanation of symbols]

 1 Cylinder 2 Piston 3 Piston Rod 4 Cleaning Nozzle 5 Hollow Rod 8 End Lock 9 Locking Part 11, 12, 13 Air Passage 14 High Pressure Water Inlet 30 High Pressure Water Passage 50 High Pressure Water Passage

Claims (1)

[Claims] 1. A high pressure fluid is formed inside a piston rod connected to a piston, wherein pressure chambers are formed on both sides of a piston slidably accommodated in a cylinder, and passages for supplying piston driving fluid are provided in these pressure chambers. And a cleaning nozzle communicating with the shaft hole at the end of the piston rod, and a high pressure fluid inlet is provided in the cylinder, and the cylinder rod is communicated with the high pressure fluid inlet and is connected to the shaft hole of the piston rod. A cleaning device, characterized in that a hollow rod, which is slidably inserted, is arranged coaxially with the shaft hole inside the cylinder.