JPS5822280A - Compensator for elongation of hung cable - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a suspension cable elongation correction device, and more particularly to a suspension cable elongation correction device that eliminates deviations in the mid-air stopping position of a suspended object.

As shown in FIG. 1, a conventional suspension cable elongation correction device has a hoisting machine 1 having a guide pulley la and a drive unit 1b.
is provided, and a take-up reel 1c is rotatably attached. The winding tarel IC of this winding machine
Ka suspension cable 2 is wound around the guide pulley 1aK, and a hanging object 3 is fixed to the tip of the suspension cable 2. A gear 5 is connected to the shaft 4 connected to the winding creel 1eK of the winding machine 1. A pinion 6 meshes with the gear 5, and a stop position control cam 8 is connected to the shaft 7 connected to the pinion 6.
A microswitch 9 is connected to the stop position cam 8. This microswitch 9 is connected to a controller 10 that is connected to the drive section 1b of the hoisting machine 1.

In such a conventional hanging couple elongation correction device, the take-up reel IC is driven by the drive unit 1b of the hoist 1.
The suspension cable 2, which has been pre-wound on this winding reel 1c, is unwound and suspended into the water along with the suspended object 3. When the suspended object is lifted into the air, the reel 1c is driven. part 1bK] is rotated in the opposite direction to unwind the suspension cable 2 and lift the suspended object 3. At this time, when the suspended object approaches the suspension start position in the air, the stop position control force ^8 acts, actuating the microswitch 9 and supplying a signal to the controller 10, which stops the drive unit 1b.

Such a suspension cable elongation correction device is capable of unwinding and unwinding the suspension cable 20 once for the first time.
is wound around the winding reel 1c in a stretched state, and when the suspended object 3 is pulled up to the hanging start position in the next operation or later, the suspension cable 2 is always stretched and wound around the winding reel 1c. Detection of the cable length is not done by directly measuring the length of the cable itself, but by measuring the number of rotations of the take-up reel. Furthermore, if the hanging cable 2 is wound around the take-up CIJ-ru 1c in many layers, even one rotation of the same take-up reel 1c will cause an error in the cable unwinding or unwinding length, resulting in cable length detection. The accuracy is poor, and especially when the suspended object 3 is repeatedly raised and lowered underwater, when the suspension cable 2 is unwound, the suspended object 3 stops at a position significantly shifted from the hanging start position to T1. .

The present invention measures and integrates the number of rotations of the guide pulley of the hoisting machine, and calculates the length of the cable.The cable length is determined by measuring and integrating the number of revolutions of the guide pulley of the hoisting machine, and calculates the length of the cable, which is fed out based on a passing signal when a water pressure sensor attached to a suspended object passes the water surface. To provide a device that can accurately control the stopping position of a suspended object in the air by resetting the value to a constant value using the value indicated by the altimeter and determining the cable length based on this value. It is something to do.

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 is a circuit diagram showing a partial block diagram of an embodiment of the hanging cable stretch correction device according to the present invention.

The winding member 1 has a guide boob Jl, 11, is provided with a driving portion 1b, and has a winding reel 1c rotatably mounted thereon. A suspension cable 2 is wound around the take-up reel IC of this hoist 1, and this suspension cable 2 comes into contact with a guide pulley 1arc. A suspended object 3 to which a vessel 14 is attached and swings is fixed. Also, the controller lO
A memory circuit 11 is connected to the memory circuit 11, and an integrator 1 is connected to the memory circuit 11.
A detector 13 such as a magnetic sensor is connected to the integrator 12, and the detector 13 is disposed above the hoisting machine 1 near the guide pulley 1a. Also, memory circuit 1
2 is connected to an altimeter 16 such as a microphone four-wave altimeter. This altimeter 16 is arranged near the guide pulley 11.

In the hanging cable elongation correction device according to the present invention having the above configuration, the winding reel 1c is rotated by the drive unit 1b of the hoisting machine 1, and the cable is wound in advance on the winding reel 1c. During this operation, the suspended cable 2 is unwound by the detector 14, which measures the number of revolutions of the guide pulley 1a of the hoisting machine 1, and thereby measures the length of the cable unwinding. The total value is accumulated by the integrator 12 and stored in the memory circuit 11. When lifting the suspended object 3 from the water to the suspension start position in the air, the drive unit 1b of the hoist l rotates the take-up reel IC in the reverse direction. When the suspended object 3 is lifted, the controller 10 controls the hoisting object 1 when the cable length in the storage circuit 11 (the sum of the cable unwinding length minus the cable unwinding length) reaches a preset value. A signal is supplied to the drive unit 1b to stop the winding operation.

In such an operation, altitude information indicated by an altimeter such as a microwave altimeter is stored in the storage circuit 11, and the hanging object 3 is stored in the storage circuit 11.
When a detector 15, such as a water pressure sensitivity meter attached to the The controller IO issues a stop signal based on this value. This has the effect of eliminating the shift in the stopping position of the suspended object 3 due to cable elongation due to the accumulation of repeated unwinding and unwinding operations. Figure 2 shows an example where the hoist is installed at a place such as a quay. However, the same effect can be obtained when the hoisting machine is mounted on a helicopter or a ship.

As explained above, the present invention corrects the elongation of the hanging cable that is unwound when the suspended object is lifted up and down in the water and then lifted up into the air when the suspended object breaks the water surface. 0 which has the effect of being able to be pulled up to the starting position of hanging in the air.

[Brief explanation of the drawing]

This is a diagram shown in . 1-7-Hoisting machine, 1a--Guide pulley, 1b
--- Drive unit %IC --- Winding] reel, 2--
・--Suspension cable, 3-m-suspension object, 4-----
・Shaft, 5--gear, 6...-binion,
8---One stop position control cam, 9---Micro switch, 10---One controller, 11---Storage circuit, 12---Integrator, 13. ...Detector, 14...-Detector, 15...Altimeter.

Claims (1)

[Claims] Drive unit 2 A winding machine consisting of a take-up reel, a guide pulley, etc., a hanging cable that is unwound and rewound by this winding machine, and a water pressure detector connected to the tip of this cable. An altimeter that can measure the height of a suspended object above the water surface, a control unit connected to the drive unit of the hoist, and a control unit that measures the rotation speed of the guide pulley of the hoist. The memorized value of the length of the suspension cable is corrected using an integrator that measures the length of the lower cable and a passing signal when the detector passes the water surface, and the value is reset to a constant value, and this value is used as a reference. and a storage circuit for supplying the signal to the controller.