JPH0683826B2 - 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 this device, since the protruding side of the piston rod is directed to the inside of the tank on the outside of the opening in the upper part of the tank, the cylinder is mounted in a standing state, so that a considerably high mounting space is provided on the upper part of the tank. There was a problem of being requested.

Further, in a cleaning device provided with a multi-stage cylinder that expands and contracts while cleaning as proposed in Japanese Patent Application No. 3-106894, the displacement speed of each piston having a different pressure receiving area depends on the flow rate of the cleaning liquid. Therefore, there is a case where a difference in the expansion and contraction speed of the piston of the first stage and the expansion and contraction speed of the pistons of the second and subsequent stages causes uneven cleaning.

Therefore, the present invention has been made to solve the above problems, and an object of the present invention is to provide a cleaning device capable of reducing the mounting space at the top of the tank and adjusting the expansion / contraction speeds of a plurality of piston rods. To do.

[0006]

According to the present invention, a first piston is slidably accommodated in a large diameter cylinder, and a small diameter cylinder connected to the first piston is slid from one end of the large diameter cylinder. Similarly, the second piston is slidably housed in the small diameter cylinder, and the hollow piston rod connected to the second piston is slidably projected from one end of the small diameter cylinder. While installing a high-pressure cleaning liquid injection nozzle at the tip, add a passage for connecting the chamber with a smaller piston pressure receiving area in the large-diameter cylinder to the pressurizing and supplying means for the cleaning liquid, and the chamber with a larger piston pressure receiving area. A passage connected to the pressure supply means or the drain side is provided, and the chamber having a larger piston pressure receiving area in the small diameter cylinder and the chamber having a larger piston pressure receiving area in the large diameter cylinder are connected to the first piston. And a hollow rod, which also penetrates the second piston in the first piston and is slidably inserted into the shaft hole of the piston rod, is disposed coaxially with the shaft hole. While forming a passage that connects the hollow rod with the chamber with the smaller piston pressure receiving area in the large diameter cylinder, the piston has a passage that constantly guides the supply pressure of the cleaning liquid to the chamber with the smaller piston pressure receiving area in the small diameter cylinder. In the cleaning device provided on the rod, a chamber having a large piston pressure receiving area in the small diameter cylinder and a chamber having a large piston pressure receiving area in the large diameter cylinder are provided in the first piston in the large diameter cylinder. A throttle that restricts the flow rate in the extending direction of the second piston in the small-diameter cylinder and a throttle that similarly restricts the flow rate in the contracting direction of the second piston are provided in the communicating passages.

[0007]

Therefore, in this apparatus, a small diameter cylinder and a large diameter cylinder are erected on the outside of the opening at the top of the tank to be cleaned with the protruding side of the small diameter cylinder and piston rod facing the inside of the tank. When the high-pressure cleaning liquid is supplied to both chambers defined by the first piston of the large-diameter cylinder, the piston in the large-diameter cylinder shrinks the chamber having the smaller pressure receiving area by the supplied hydraulic pressure, that is, , Sliding in the protruding direction of the small diameter cylinder. At the same time, hydraulic pressure is also supplied to the chambers on both sides of the second piston in the small diameter cylinder via the hollow rod, through hole and throttle, so that the second piston in the small diameter cylinder also slides in the protruding direction of the piston rod. To do. The displacement speed of the piston rod in the protruding direction is regulated by the first throttle provided in the through hole of the first piston in the large-diameter cylinder and becomes a predetermined speed set in advance. Therefore, the large diameter cylinder to the small diameter cylinder further extend from the small diameter cylinder to the piston rod at a predetermined speed synchronized with the first piston, and the injection nozzle descends inside the tank at a predetermined speed.

When the through hole communicating with the chamber having the larger piston pressure receiving area of the large diameter cylinder is switched to the drain side, the first piston in the large diameter cylinder receives the pressure due to the supply fluid pressure of the chamber having the smaller pressure receiving area. While discharging the hydraulic pressure in the chamber with the larger area to the drain side, it slides in the contraction direction of the small diameter cylinder. At the same time, the second piston in the small diameter cylinder also escapes from the hydraulic pressure in the chamber having the larger pressure receiving area to the chamber having the larger piston pressure receiving area in the large diameter cylinder and slides in the contracting direction of the piston rod. . The displacement speed of the piston rod in the contraction direction is regulated by the second throttle provided in the through hole of the first piston in the large-diameter cylinder and becomes a preset speed. Therefore, the small diameter cylinder inside the large diameter cylinder and the piston rod inside the small diameter cylinder contract at a predetermined speed in synchronization with the first piston, and the injection nozzle moves up inside the tank at a predetermined speed.

Since the injection nozzle constantly receives the high-pressure cleaning liquid from the chamber having the smaller piston pressure receiving area in the large-diameter cylinder via the piston rod and the hollow rod, the injection nozzle continuously operates in the up-and-down stroke of the tank. The inside of the tank is washed at a predetermined speed by injecting a high-pressure washing liquid.

[0010]

1 to 2 show an embodiment of the present invention.

In FIG. 1, a piston 2 as a first piston is slidably housed inside a large-diameter cylinder 1, and a bearing 3 provided at one end in the large-diameter cylinder 1.
A small diameter cylinder 4 slidably inserted through is connected to one side of the piston 2.

A piston 5 as a second piston is slidably accommodated in the small diameter cylinder 4, and pressure chambers 11 and 12 are defined on both surfaces of the piston 5. A hollow piston rod 6 connected to one side of the piston 5 is slidably supported at one end of a small diameter cylinder 4 via a bearing 7, and a high pressure cleaning liquid injection nozzle 8 is attached to the tip thereof. In this embodiment, the stroke amounts of the large diameter cylinder 1 and the small diameter cylinder 4 are set to be equal.

In the pressure chambers 9 and 10 defined by the piston 2 in the large-diameter cylinder 1, a high-pressure liquid inlet 30 and a high-pressure liquid passage 31, which communicate with the outside of the large-diameter cylinder 1, are opened, and the high-pressure liquid inlet 30 is opened. Is connected via a valve (not shown) to a pump or the like as a pressure supply means for the high-pressure cleaning liquid, and the high-pressure liquid passage 31 is also connected via a valve to a pump or drain as a pressure supply means.

In order to supply the high-pressure cleaning liquid to the injection nozzle 8 of the piston 2, a hollow rod 14 which can freely slide through the piston 5 in the small diameter cylinder 4 and can be inserted into the shaft hole 6a of the piston rod 6 stands. A through hole 15 is provided which connects the inside of the hollow rod 14 with the pressure chamber 9 having the smaller piston pressure receiving area in the large diameter cylinder 1. The hollow rod 14 has such a length that it can be inserted into the shaft hole 6a of the piston rod 6 even at the bottom dead center position of the piston 5.

The piston rod 6 is formed with a through hole 16 for introducing the cleaning liquid from the shaft hole 6a into the pressure chamber 11 having a smaller piston pressure receiving area in the small diameter cylinder 4.

The piston 2 of the large diameter cylinder 1 communicates with the pressure chamber 12 having a larger piston pressure receiving area in the small diameter cylinder 4 and the pressure chamber 10 having a larger piston pressure receiving area in the large diameter cylinder 1. 13 is formed, and the cleaning liquid enters and leaves between the pressure chamber 10 of the piston 2 and the pressure chamber 12 of the piston 4.

The through hole 13 is branched into the through holes 13a and 13b on the pressure chamber 10 side of the piston 2, and the check valve 20a which allows only the flow from the pressure chamber 10 to the pressure chamber 12 in the through hole 13a. A throttle 20 having a check valve 21a that allows only the flow from the pressure chamber 12 to the pressure chamber 10 is also provided in the through hole 13b. The inner diameters of the throttles are set so that the expansion and contraction speeds of the pistons have predetermined values equal to the speeds of the piston 2 in the expansion and contraction directions. When the piston 2 slides in the protruding direction of the piston rod 6, the cleaning liquid is squeezed through the through hole 13a.
When the piston 2 slides in the contraction direction of the piston rod 6 through the through hole 13 after the flow rate is restricted, the cleaning liquid flows from the pressure chamber 12 through the through hole 13.
After being restricted in flow rate by the throttle 21 through the passage, it is discharged into the pressure chamber 10 through the through hole 13b.

Next, the operation based on such a configuration will be described. This device is mounted outside the opening at the top of the tank in a state where the large diameter cylinder 1 is erected with the protruding sides of the small diameter cylinder 4 and the piston rod 6 facing the inside of the tank.

When the high-pressure liquid inlet 30 and the high-pressure liquid passage 31 of the large-diameter cylinder 1 are connected to pressurizing and supplying means for high-pressure cleaning liquid by switching valves (not shown), pressure chambers on both sides of the piston 2 in the large-diameter cylinder 1 are connected. Since the high-pressure cleaning liquid is supplied to 9, 10, the piston 2 in the large-diameter cylinder 1 slides in the direction in which the pressure chamber 9 having the smaller pressure receiving area is contracted by the supplied liquid pressure, that is, in the protruding direction of the small-diameter cylinder 4. Move.

At the same time, the high-pressure cleaning liquid is also supplied to the pressure chambers 11 and 12 on both sides of the piston 5 in the small diameter cylinder 4,
The cleaning liquid supplied from the high pressure liquid inlet 30 is pressure-fed to the pressure chamber 11 through the through hole 15, the hollow rod 14 and the through hole 16, and the pressure chamber 12 is pressurized with the cleaning liquid supplied from the high pressure liquid passage 31. The flow rate is restricted from the chamber 10 through the through hole 13a through the throttle 20 to a predetermined value, and then is pressure-fed through the through hole 13.

Since the pressure receiving area of the piston 5 is larger on the pressure chamber 12 side, the piston 5 also slides in the protruding direction of the piston rod 6, and the displacement speed of the piston rod 6 is the throttle 2.
It becomes equal to the displacement speed of the piston 2 set in advance by 0.

Therefore, since the small diameter cylinder 4 projects from the large diameter cylinder 1 and the piston rod 6 projects from the small diameter cylinder 4 at the same speed as the small diameter cylinder 4, the injection nozzle 8 has a piston pressure receiving area within the large diameter cylinder 1. From the smaller pressure chamber 9 to the through hole 15 and the hollow rod 14.
While being supplied with the high-pressure cleaning liquid via the, the inside of the tank is lowered at a predetermined constant speed (see FIG. 1).

On the other hand, when the high-pressure liquid passage 31 is switched to the drain side while the high-pressure liquid inlet 30 is connected to the pressurizing and supplying means for the cleaning liquid, the piston 2 in the large-diameter cylinder 1 has the pressure chamber 9 having the smaller pressure receiving area. The cleaning liquid in the pressure chamber 10 having the larger pressure receiving area is discharged to the drain side by the supplied liquid pressure, and slides in the contracting direction of the small diameter cylinder 4.

At the same time, the piston 5 in the small-diameter cylinder 4 also has a flow rate of the cleaning liquid in the pressure chamber 12 having the larger pressure receiving area, which is restricted from the through hole 13 by the throttle 21 and then passes through the through hole 13b. To the pressure chamber 10 inside, while
The cleaning liquid is pumped into the pressure chamber 11 through the hollow rod 14 and the through hole 16 and slides in the contracting direction of the piston rod 6, and the displacement speed of the piston rod 6 is the displacement speed of the piston 2 preset by the throttle 21. Is equal to

Therefore, the small diameter cylinder 4 contracts in the large diameter cylinder 1, and the piston rod 6 contracts in the small diameter cylinder 4 at the same speed as the small diameter cylinder 4.
The injection nozzle 8 rises inside the tank at a predetermined constant speed while receiving the supply of the high-pressure cleaning liquid from the pressure chamber 9 in the large diameter cylinder 1 through the through hole 15 and the hollow rod 14 (see FIG. 2).

By the way, in the above-mentioned ascending / descending, the injection nozzle 8 is moved to the piston rod 6 and the hollow rod 1 as described above.
4 is constantly supplied with high-pressure cleaning liquid from the pressure chamber 9 in the large-diameter cylinder 1 through the through hole 15 and the cleaning liquid is continuously sprayed on both sides of the ascending / descending stroke in the tank, so that the inside of the tank is efficiently cleaned. can do.

Further, by utilizing the supply pressure of the cleaning liquid, the small diameter cylinder 4 is expanded and contracted with respect to the large diameter cylinder 1 and the piston rod 6 is expanded and contracted with respect to the small diameter cylinder 4, respectively, and the throttles 20 and 21 are further expanded. Since the expansion and contraction speeds of the piston 5 are set equal to the displacement speed of the piston 2 and the stroke amounts of the large diameter cylinder 1 and the small diameter cylinder 4 are made equal to each other, the injection nozzle 8 moves up and down at a predetermined constant speed to move inside the tank. It becomes possible to wash evenly,
Further, it is possible to reduce the size of the entire apparatus by half without changing the lifting stroke of the injection nozzle 8.

FIG. 3 is a sectional view showing another embodiment, in which the orifices 20 and 21 in the first embodiment are replaced with replaceable orifices 22 and 24, respectively. The large diameter cylinder 1 and the small diameter cylinder 4 are shown in FIG. The structure of is similar to that of the above embodiment.

In the through hole 13a of the piston 2 which connects the pressure chamber 10 of the piston 2 and the pressure chamber 12 of the piston 5, an orifice 22 for regulating the flow rate of the cleaning liquid in the extension direction of the piston 5 is provided upstream of the check valve 23. Similarly, an orifice 24 that regulates the flow rate of the cleaning liquid in the contracting direction of the piston 5 is provided upstream of the check valve 25 in the through hole 13b.

The orifice 22 and the check valve 23 are housed in a case 43, and the orifice 24 and the check valve 25 are housed in a case 44. The cases 43 and 44 are housed in the through holes 13a and 13b from the end surface of the piston 2 facing the pressure chamber 10, and the holder 41 fastened to the end surfaces prevents the cases 43 and 44 from falling off from the piston 2. The holder 41 has communication holes 41a and 41b.
Are provided for the through holes 13a and 13b and the pressure chamber 1, respectively.
Connect with 0.

The cylinder head 40 forming the end of the large-diameter cylinder 1 is fastened to the large-diameter cylinder 1 with bolts 45 so as to be detachable.

Further, by adding an end lock mechanism 50 to the large diameter cylinder 1 side, when the pistons 2 and 5 are both at the top dead center position, the piston rod 6 is at the most contracted position, the piston rod 6
The locking member 51 attached to the end of the piston rod 6 is locked to hold the contracted state of the piston rod 6 and the hollow rod 14.

Further, the proximity switch 60 for detecting that the piston rod 6 has reached the most contracted position is provided with the large-diameter cylinder 1.
Connected to a control device (not shown) provided at the lower part of the proximity switch 60 to detect the position where the locking member 51 provided at the end of the piston rod 6 is closest to the proximity switch 60.
Can be turned on to check the position of the piston rod 6 inside the tank, which cannot be visually confirmed. An injection nozzle (not shown) is attached to the end of the piston rod 6 via the locking member 51.

To replace the orifice 22 or 24:
After loosening the bolt 45 and removing the cylinder head 40 from the large diameter cylinder 1, the holder 41 fastened to the piston 2 with a bolt (not shown) is removed. Case 4 in this state
By withdrawing 3 or 44 from the piston 2, the orifices 22 or 24 accommodated therein can be easily replaced.

Since the orifices 22 and 24 are exchangeable, the displacement speeds of the piston 5 in the extension direction and the contraction direction can be easily changed, and the injection nozzle can be moved up and down according to the shape of the tank to be cleaned. It is possible to set the speed, and it is possible to uniformly wash the insides of various tanks with one washing device.

After replacing the orifice 22 or 24, the case 43 or 44 may be inserted into the through hole 13a or 13b, and the holder 41 and the cylinder head 40 may be fastened in this order.

In the above embodiment, the throttles 20, 21 are arranged so that the displacement speeds of the piston 2 and the piston 5 become equal.
However, as shown in FIG. 4, when the stroke amounts of the piston 2 and the piston 5 are equal to each other, the displacement speed of the piston 5 is made higher than the displacement speed of the piston 2, and the piston rod 6 is fully extended during the extension of the piston 2. The position may be set so as to reach the position, and in this setting, the displacement speed of the injection nozzle in the vicinity of the bottom of the tank can be reduced to thoroughly clean the bottom of the tank.

[0038]

As described above, according to the present invention, the small diameter cylinder expands and contracts with respect to the large diameter cylinder and the piston rod expands and contracts with respect to the small diameter cylinder by utilizing the supply pressure of the cleaning liquid. Since the expansion / contraction speed of the nozzle is set to a predetermined speed in synchronization with the first piston by the throttle, by setting the ascending / descending speed of the injection nozzle according to the cleaning target, uneven cleaning can be prevented and cleaning can be performed uniformly. Moreover, the entire apparatus can be compactly housed without changing the lifting stroke of the injection nozzle.

[Brief description of drawings]

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

FIG. 2 is a schematic view of a cylinder showing a contracted state of a piston rod.

FIG. 3 is a sectional view showing another embodiment.

FIG. 4 is a diagram showing a relationship between a stroke amount of a piston and time.

[Explanation of symbols]

 1 Large Diameter Cylinder 2, 5 Piston 4 Small Diameter Cylinder 6 Piston Rod 9, 10, 11, 12 Pressure Chamber 14 Hollow Rod 13, 15, 16 Through Hole 20, 21 Throttle

Claims (1)

[Claims] 1. A small-diameter cylinder in which a first piston is slidably accommodated in a large-diameter cylinder, and a small-diameter cylinder connected to the first piston is slidably protruded from one end of the large-diameter cylinder. A second piston is slidably housed inside, and a hollow piston rod connected to the second piston is slidably protruded from one end of a small diameter cylinder, and a high-pressure cleaning liquid injection nozzle is provided at the tip of the piston rod. On the other hand, connect the chamber with the smaller piston pressure receiving area in the large-diameter cylinder to the pressurizing and supplying means for the cleaning liquid, and connect the chamber with the larger piston pressure receiving area to the pressurizing and supplying means or the drain side. And a passage for connecting the chamber having a larger piston pressure receiving area in the small diameter cylinder and the chamber having a larger piston pressure receiving area in the large diameter cylinder are formed in the first piston. A hollow rod, which is slidably penetrating the second piston in the first piston and is slidably inserted in the shaft hole of the piston rod, is arranged coaxially with the shaft hole, and a piston in a large diameter cylinder is provided. In a cleaning device in which a passage for communicating a chamber with a smaller pressure receiving area and a hollow rod is formed, while a passage for always supplying the supply pressure of the cleaning liquid to the chamber with a smaller pressure receiving area of the piston in the small diameter cylinder is provided in the piston rod. A small-diameter cylinder provided in the first piston in the large-diameter cylinder to connect a chamber having a larger piston pressure receiving area in the small-diameter cylinder to a chamber having a larger piston pressure receiving area in the large-diameter cylinder. A cleaning device, wherein a throttle for restricting a flow rate of the second piston in the extending direction and a throttle for restricting a flow rate of the second piston in the contracting direction are respectively provided.