JPS5929474B2 - Load securing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cargo securing device for efficiently securing a large amount of cargo, such as a ship.

As a conventional technology of this cargo fixing device,
There is one disclosed in No. 6508 (Utility Application No. 50-47236). This conventional device includes a compressed air generator that is connected to a drive source and generates pressurized air, a flexible bag-like fixing device that is placed at a position for fixing cargo and has an inlet/outlet, and the bag-like fixing device. and a switching valve provided between the pressure air generator and the pressure air generator, and when the switching valve is in the supply position, the switching valve connects the discharge port of the pressure air generator and the supply/discharge port of the bag-like fixing device. When in the exhaust position, the suction port of the pressure air generator and the supply/discharge port of the bag-like fixing device are connected to communicate the inlet of the pressure air generator to the atmosphere. It connects the discharge port to the atmosphere.

Further, a check valve whose forward direction is from the pressure air generator to the switching valve is provided between the discharge port of the pressure air generator and the switching valve. In the conventional device with the above configuration, when securing a load, the switching valve is switched to the supply position, the pressure air generator is operated by the drive source, atmospheric air is sucked in from the inlet of the pressure air generator, and the air is converted into pressurized air from the discharge port. The discharged pressurized air is supplied to the bag-like fixing device via a check valve and a switching valve. Then, when the cargo is completely fixed, the operation of the pressurized air generator is stopped. When releasing the fixation of the cargo, the switching valve is switched to the discharge position, the pressure air generator is operated by the drive source, the pressure air generator sucks the pressurized air in the bag-like fixation device, and the check valve is released from the discharge port. released into the atmosphere via

Then, when the discharge of the pressurized air in the pressure device in the bag-shaped fixing device is completed and the fixation of the cargo is released, the operation of the pressurized air generator is stopped. However, conventional cargo securing devices
After the cargo is secured, the pressurized air inside the bag-shaped fixing device leaks from the connections of the passage piping, and the pressure decreases, making it impossible to maintain the cargo in a fixed state, which poses a risk of the cargo collapsing during transportation. Therefore, in the above-mentioned prior art, after the cargo is secured and the operation of the pressurized air generator is stopped, the pressure air inside the bag-like securing device leaks from the connection part of the passage piping, etc., and the pressure decreases. The purpose of this system is to prevent load collapse by continuously replenishing pressurized air and keeping the pressure almost constant. a high-pressure air generator, the bag-shaped fixing device, and a switching valve (referred to as a first switching valve).

) is provided in a passage that branches from the passage between the bag-shaped fixing device and connects to the discharge port of the high-pressure air generator, and assumes a folded position when the bag-shaped fixing device fixes the cargo and releases the fixation of the cargo, and after fixing the cargo. and a second elevation valve that is in a communicating position. Hereinafter, a diagram showing an embodiment according to the present invention will be described.

In FIG. 1, reference numeral 1 denotes a reversibly operable low-pressure air generator, which is driven by a motor 11 and the driving force of the motor 11, and generates low-pressure, large-capacity pressurized air (for example, a Roots blower).

)10. The proa 10 has a pressurized air discharge port 13 and an inlet port 12 open to the atmosphere, and when the motor 11 rotates in one direction, air is sucked in from the suction port 12 and pressurized air is discharged to the discharge port 13. do. However, when the motor 11 starts rotating in the other direction, air is sucked in through the discharge port 13 and pressurized air is discharged from the suction port 12. It is capable of so-called reversible operation. The high-pressure air generator 2 includes a motor 14, a compressor 15, such as a regipro type, which is operated by the driving force of the motor 14 and generates high-pressure, low-discharge pressure air, and a pressure limiting valve 17. It is formed by a tank 16 connected to the discharge side of the compressor 15 via a valve 18, and a pressure reducing valve 19.

The auxiliary pressure air source 5 includes a tank 20 connected to another pressure air source 6 and the high pressure air generator 2 via check valves 8 and 9, and a compressor 15 of the high pressure air generator 2. Switching valve 2 connected to unload port 15a
1 and more. The auxiliary pressure air source 5 is used for unloading the compressor 15 of the high pressure air source 2 at the time of starting. That is, the motor 1 that drives the compressor 15 when the compressor 15 is started.
Pressurized air in the tank 20 is supplied to the unload port 15a via the switching valve 21 so that no overload is applied to the tank 4. The switching valve units 3a, 3b, 3c, 3d are shown in FIG.
c, 4d and the low-pressure air generator 1 and the high-pressure air generator 2, and a command device (not shown).

) first switching valves 21a, 21b operated by commands of
, 21c, 21d and second switching valves 22a, 22b, 2
2c, 22d, hereinafter simply referred to as switching valves 21a, 2.
1b, 21c, 21d, switching valves 22a, 22b, 22c
, 22d. The switching valves 22a, 22b, . It has two positions: a position and a position where it breaks. The switching valves 21a to 21d are connected to the high pressure air generator 2, the switching valves 22a to 22d, and the bag-shaped fixing devices 4a to 21d.
It is provided in the piping 24 connected between the piping 4d and has two positions: a position where the pipe communicates with the piping 24, and a position where the piping is disconnected.
These switching valves 21a, ~21d and switching valves 22a, ~22
d are controlled so that when one is in the communicating position, the other is in the disconnected position. Bag-shaped fixing devices 4a, 4b,...
... is a bag 2 made of flexible material as shown in Figure 2.
5 are fixed to the ceiling 26 of the hold where the cargo 27 is loaded, and the large diameter pipe 23 is connected to the supply/discharge port 28 of the bag 25.
Connect to.

The operation of this embodiment having the above configuration will be described.

When the cargo 27 is loaded under the bag 25 and this loading is completed at the bag-shaped fixing device 4a, a command is given to set the switching valves 21a and 22a of the switching valve unit 3a to the closed position and the communicating position, respectively. .

Next, when an operating command is given to the motor 11 of the low-pressure pressure air generator 1, the prower 10 sucks atmospheric air through the suction port 12 and generates low-pressure, large-flow pressurized air at the discharge port 13. This pressurized air passes through the large-diameter pipe 23 and the switching valve 22a.
It flows into the multiple bags 25 of the bag-shaped fixing device 4a and inflates the bags 25. After the bag 25 is inflated, the expansion force of the bag 25 presses against the cargo 27 and secures it in place. 2 bags each
When the air pressure within 5 reaches the air pressure generated by the low pressure air generator 1, the pressure is detected and the operation of the low pressure air generator 1 is stopped based on the signal. Almost simultaneously with this operation, the switching valves 21a and 2 of the switching valve unit 3a
2a are respectively switched between a communicating position and a heel disconnection position. Therefore, in the bag-like fixing device 4a, the pressure air in the tank 16 of the high-pressure air generator 2 is reduced in pressure by the pressure reducing valve 19, and the piping 24 is
, it becomes ready to be supplied to each bag 25 of the bag-shaped fixing device 4a via the switching valve 21a. As a result, leakage of pressurized air from the bag-like fixing device 4a can be successively replenished. Note that the high-pressure air generator 2 is controlled on and off so that the air pressure in the tank 16 is always kept at a substantially constant value. Then, while supplying pressurized air to the bag-like fixing device 4a, the work of loading cargo into the bag-like fixing device 4b continues. When the loading of the cargo into the bag-shaped fixing device 4b is completed, the same operations as described above are repeated to fix the cargo. After loading the cargo and securing the cargo, the switching valve unit 3a
, 3b, 3c, 3d, switching valves 21a, 21b, 21c
, 21d are in the communication position, and the switching valves 22a, 22b, 2
2c and 22d are in the shrunk position to maintain the air pressure in each bag 25 of the bag-shaped fixing devices 4a, 4b, 4c, and 4d at a constant value during cargo transportation, and to prevent the cargo from buckling.

Next, we will discuss the case where the cargo is released from the cargo after transportation is completed. In order to release the fixation of the cargo, first, each switching valve 21a,
21b, 21c, 21d and 22a, 22b, 22c,
22d to the disconnection position and the communication position, respectively, and operate the motor 11 of the low pressure generator 1 to
Bag-shaped fixing devices 4a, 4b, 4c, 4d from the outlet 13 of
The pressurized air inside the bag 25 is sucked and the suction port 1 is opened when the cargo is fixed.
From 2, it is released into the atmosphere.

Therefore, the air in each bag 25 of the bag-like fixing devices 4a, 4b, 4c, and 4d is rapidly discharged and contracted, releasing the cargo from being fixed. In this embodiment, only one low-pressure air generator 1 is illustrated, but a plurality of units may be used depending on the amount of air required by the bag-shaped fixing device, and the same proa may be used. However, it may be used exclusively for discharging the air inside the bag-like fixing device and for supplying it.

As is clear from the above embodiments, the present invention is aimed at preventing the pressure air inside the bag-shaped fixing device from leaking from the connection part of the passage piping and reducing the pressure after the cargo is fixed.
The bag-shaped fixing device is continuously supplied with pressurized air from a high-pressure air generator to maintain a constant pressure, thereby preventing cargo from collapsing, so it can be transported by means of transportation such as ships that transport large quantities of cargo. This has the advantage that there is no need to look around for cargo inside.

[Brief explanation of the drawing]

FIG. 1 is a piping diagram of an embodiment according to the present invention, and FIG. 2 is a partially enlarged view of the embodiment with a bag attached. 1...Low pressure air generator, 2...
High pressure air generator, 3a, 3b, 3c, 3d...
...Switching valve unit, 4a, 4b, 4c, 4d...
...bag-shaped fixing device, 10...proa, 11.
...Motor, 14...Motor, 15...
... Compresssa 1 25 ... Bag, 28.
... Supply and discharge ports, 21a, 21b, 21c, 21d.
...First switching valve, 22a, 22b, 22c, 2
2d...Second switching valve.

Claims (1)

[Claims] 1. A flexible bag-like fixing device located at a position to fix cargo and equipped with an inlet/outlet, and a low-pressure air generator that is connected to a drive source and generates low-pressure, large-capacity pressurized air that can be operated reversibly. , is provided between the supply/discharge port of the bag-shaped fixing device and the low-pressure pressure air generator, and is in a communicating position when the bag-shaped fixing device fixes a load and releases the fixation of the load, and is in a cutting position after fixing the load. a first switching valve, a high-pressure air generator connected to a drive source and generating high-pressure, low-capacity pressurized air, and a passage branched from a passage between the bag-shaped fixing device and the first switching valve. A second switch is provided in a passage connected to the discharge port of the high-pressure air generator, and is in a closed position when the bag-like fixing device fixes a load and releases the fixation of the load, and becomes a communicating position after fixing the load. Load securing device with valves and.