JP2877995B2 - Locking system for pneumatic caisson - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock system for a pneumatic caisson.

[0002]

2. Description of the Related Art FIG. 2 shows the entire structure of a conventional pneumatic caisson lock air supply / exhaust system. In this conventional example, when loading and unloading the bucket 100 and the like, pressurizing and depressurizing operations in the lock 101 accompanying opening and closing operations of the hatches 102 and 103 are performed in the following procedure. That is, the upper hatch 102 is opened by operating the cylinder 106 and the bucket 100 is carried into the lock 101 in a state where the lower hatch 103 is closed. Subsequently, the upper hatch 102 is closed, the air supply valve 111 is opened, and the lock 10 is opened from the air compressor 104 via the air supply pipe 113.
1 and the pressure in the lock 101 and the working chamber 10
Pressurize until the pressure in 9 becomes equal. Next, the air supply valve 11
1 is closed, the cylinder 107 is operated, and the lower hatch 10 is closed.
Open 3 and lower the bucket 100.

In order to carry out the bucket 100, the bucket 100 is lifted on the lock 101 with the upper hatch 102 closed and the lower hatch 103 opened, then the lower hatch 103 is closed and the exhaust valve 112 is opened to lock the bucket 100. 1
The air inside 01 is released into the atmosphere. At this time, the exhaust noise is reduced by the silencer 105 attached to the tip of the exhaust pipe 114. Thus, the pressure in the lock 101 is reduced until the pressure in the atmosphere becomes equal to that in the atmosphere, the upper hatch 102 is opened, and the bucket 100 is carried out. Note that the air compressor 104 is operated while the loading / unloading of the bucket 100 is being performed.

[0004]

However, according to the conventional example, exhaust gas is continuously released into the atmosphere while the pressurization and depressurization for opening and closing the hatches 102 and 103 are repeated, so that noise due to the exhaust gas is reduced. There was a problem that occurred.
For this reason, the muffler 105 must be provided at the exhaust port. Furthermore, in urban areas, noise reduction measures had to be taken, such as placing the entire caisson in a soundproof house.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a pneumatic caisson for collecting and reusing exhaust gas so that noise due to the exhaust gas is not generated. An object of the present invention is to provide a lock air supply / exhaust system.

[0006]

In order to achieve the above-mentioned object, the present invention provides an auxiliary air compressor and a pressure vessel in a supply / exhaust pipe of a lock for a pneumatic caisson, and when the inside of the lock is depressurized, When the pressure inside the lock is accumulated in the pressure vessel using an auxiliary air compressor, and when the inside of the lock is pressurized,
By sending the compressed air stored in the pressure vessel into the lock using an auxiliary air compressor, the exhaust air is prevented from being generated without reusing the compressed air to exhaust the compressed air to the atmosphere.

[0007]

According to the present invention, according to the present invention, in order to depressurize the inside of the lock, suction is performed using an auxiliary air compressor until the inside of the lock becomes equal to the atmospheric pressure, and the compressed air is accumulated in the pressure vessel. Further, in order to pressurize the inside of the lock, the compressed air accumulated in the pressure vessel as described above is supplied into the lock using the auxiliary air compressor until the inside of the lock becomes equal to the atmospheric pressure in the working chamber.

That is, the exhaust gas for depressurizing the inside of the lock is sucked and stored as compressed air, and when the inside of the lock is pressurized, the compressed air stored in the pressure vessel is supplied to the inside of the lock. In this way, by reusing the compressed air and not discharging the compressed air to the atmosphere, it is possible to easily prevent the generation of exhaust noise.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an overall configuration of a pneumatic caisson lock air supply and exhaust system according to the present invention. In the figure, the air compressors 5, 2
0 and a pressure vessel 17 are provided. When the pressure in the lock 2 is reduced by this system, the compressed air is supplied to the auxiliary air compressor 2.
When the pressure is accumulated in the pressure vessel 17 due to 0 and the inside of the lock 2 is pressurized, the compressed air accumulated in the pressure vessel 17 is supplied by the auxiliary air compressor 20.

Here, a procedure for carrying the bucket 1 out of the caisson will be described. First, the air supply valves 12, 16 and the exhaust valve 13 are closed, the upper hatch 3 is closed, and the lower hatch 4 is closed.
The bucket 1 is lifted in the lock 2 in the state in which is opened. Subsequently, the lower hatch 4 is closed, the first directional switching valve 18 is switched so that air can be supplied from the exhaust valve 13 to the auxiliary air compressor 20, and the second directional switching valve 19 is switched from the auxiliary air compressor 20 to the pressure vessel 17. Switch so that air can be supplied.

Then, the auxiliary air compressor 20 is started,
By opening the exhaust valve 13, the compressed air in the lock 2 is sucked and accumulated in the pressure vessel 17. Thus, the pressure inside the lock 2 is reduced until it becomes equal to the atmospheric pressure, the auxiliary air compressor 20 is stopped, the exhaust valve 13 is closed, the upper hatch 3 is opened, and the bucket 1 is carried out.

In order to carry the bucket 1 into the caisson, the air supply valve 12 and the exhaust valve 13 are closed and the upper hatch 3 is closed.
Is opened, and the bucket 1 is carried into the lock 2 with the lower hatch 4 closed. Then, close the upper hatch 3 and
The direction switching valve 18 is moved from the pressure vessel 17 to the auxiliary air compressor 20.
And the second directional switching valve 19 is switched so that air can be supplied from the auxiliary air compressor 20 to the air supply valve 12.

Then, the auxiliary air compressor 20 is started,
The air supply valve 12 is opened, and the compressed air accumulated in the pressure vessel 17 is supplied into the lock 2. Thus, the pressure in the lock 2 is increased until it becomes equal to the pressure in the working chamber 10, the auxiliary air compressor 20 is stopped, the air supply valve 12 is closed, the lower hatch 4 is opened, and the bucket 1 is lowered.

The auxiliary air supply valve 16 provided in the air supply / exhaust pipes 14 and 15 serves as a caisson in which the pressure in the pressure vessel 17 becomes insufficient due to the initial carrying-in work without pressure or the pressure increase. It is opened in order to supplement the air pressure when carrying in after sinking. In this loading / unloading operation, if the pressure in the pressure vessel 17 is sufficient, the air compressor 5 is used as power for the hatch opening / closing cylinders 7 and 8 and, if necessary, the air equipment 9 used in the caisson. Only used.

[0015]

As described above, according to the present invention, an auxiliary air compressor and a pressure vessel are provided in the air supply / exhaust pipe of a lock for a pneumatic caisson. When pressurizing the inside of the lock, pressurized air stored in the pressure container is sent into the lock using an auxiliary air compressor, so that the bucket and the like with the box are loaded and unloaded. Since the compressed air is not released into the atmosphere, generation of noise due to exhaust can be prevented. For this reason, the object of noise suppression is only the air compressor, and there is no need to supply a large amount of compressed air. Therefore, a small-sized air compressor that supplies compressed air can be used.

Further, by starting the auxiliary air compressor at the time of opening / closing the valve at the same time as the opening / closing of the valve, the time required for sending / exhausting can be shortened, and the working time can be shortened. In this case, if the operation is performed after the internal pressures of both the lock and the pressure vessel become equal, the operation time of the auxiliary air compressor is shortened, which is economical. Furthermore,
The auxiliary air compressor used for air supply and exhaust may be replaced with a pressurized blower depending on the value of the air supply pressure determined by the maximum pressure of the working chamber and the volume ratio between the lock and the pressure vessel.

[Brief description of the drawings]

FIG. 1 is a view showing the overall configuration of a pneumatic caisson lock air supply and exhaust system according to the present invention.

FIG. 2 is a diagram showing the overall configuration of a conventional pneumatic caisson lock air supply / exhaust system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Bucket 2 ... Lock 3 ... Upper hatch 4 ... Lower hatch 5 ... Air compressor 10 ... Work chamber 12 ... Air supply valve 13 ... Exhaust valve 14 ... Air supply Piping 15 ··· Exhaust piping 16 ··· Auxiliary air supply valve 17 ··· Pressure vessel 18, 19 ··· Direction switching valve 20 ··· Auxiliary air compressor

Claims (1)

(57) [Claims] An auxiliary air compressor (20) and a pressure vessel (17) are provided in the air supply / exhaust pipes (14, 15) of a lock for a pneumatic caisson, and when the pressure inside the lock (2) is reduced, the lock ( 2) The compressed air in the pressure vessel (17) is accumulated in the pressure vessel (17) using the auxiliary air compressor (20), and when the lock (2) is pressurized, the compressed air stored in the pressure vessel (17) is accumulated in the auxiliary air compressor (20). 20. An air supply / exhaust system for a lock for a pneumatic caisson, wherein air is supplied into the lock (2) using (20).