JPH09100091A - Winch for crane and control method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crane winch whose start-up of drum rotational speed does not become steep even if a quick winch lever is operated, and a control method therefor. SOLUTION: A pilot hydraulic power source 5 for a control valve 6 being connected to a main hydraulic power source 7 and a hydraulic motor 8 in order to control a supply of hydraulic pressure to this hydraulic motor 8 is installed and also five pilot hydraulic control means 1, 2, 3, 4 and 11 are also installed in the space between the pilot hydraulic power source 5 and the control valve 6. In addition, while an amount of pilot hydraulic pressure for adjusting an opening area of the control valve 6 by these pilot hydraulic control means 1, 2, 3, 4 and 11 is varied according to the manipulated variable of a winch lever 12, and if acceleration of a drum 10 is within the setting value where a wire is not leensened, the amount of the pilot hydraulic pressure is maintained as it is, but if the acceleration is more than the setting value where the wire is not loosened, it is varied to the proper hydraulic pressure quantity so as to become the acceleration where the wire is not loosened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crane winch, and more particularly to a crane winch capable of preventing loosening and irregular winding of a wire due to rapid operation of a winch lever, and a control method thereof.

[0002]

2. Description of the Related Art A conventional winch for a crane is shown in FIG. In FIG. 4, 51 is a remote control valve, 52 is a pilot hydraulic pressure source, 53 is a control valve, 54 is a main hydraulic pressure source, 55 is a hydraulic motor, 56 is a speed reducer, 57 is a drum, and 58 is a winch lever.

The remote control valve 51 is arranged below the winch lever 58 and opens in proportion to the amount of tilt operation of the winch lever 58. The pilot oil pressure source 52 is connected to the control valve 53 via the remote control valve 51 and the hoist 59 for hoisting and the hose 60 for hoisting that come out from the remote control valve 51, and supplies the pilot oil pressure for the control valve 53. To do. The remote control valve 51 controls so that pilot hydraulic pressure proportional to the operation amount of the winch lever 58 flows to the control valve 53. The control valve 53 opens in proportion to this pilot hydraulic pressure. Main hydraulic power source 54
Is connected to the hydraulic motor 55 via the control valve 53, and supplies hydraulic pressure for driving the hydraulic motor 55. The control valve 53 controls the drive hydraulic pressure to flow to the hydraulic motor 55 in proportion to the pilot hydraulic pressure, that is, in proportion to the operation amount of the winch lever 58.

Next, the operation of the crane winch having such a structure will be described. When the winch lever 58 is gradually tilted in the hoisting or lowering direction, the pilot hydraulic pressure for the control valve 53 controlled by the remote control valve 51 to be proportional to the tilting operation amount of the winch lever 58 is fed from the pilot hydraulic power source 52 to the hoisting hose. 59 or through the hose 60 for unwinding and flows into the control valve 53. The control valve 53 opens in proportion to this pilot oil pressure, that is, the operation amount of the winch lever 58. Then, the hydraulic pressure from the main hydraulic power source 54 controlled by the control valve 53 to be proportional to the operation amount of the winch lever 58 flows to the hydraulic motor 55.
The hydraulic motor 55 is driven in proportion to the operation amount of the winch lever 58, and the drum rotates 57. At this time, the drum 57
Starts winding or winding the wire while increasing the rotation speed in proportion to the operation amount of the winch lever 58. Then, when the winch lever 58 is tilted to the maximum, the drum 57 rotates at the maximum speed to continue winding or winding.

[0005]

As described above, in the conventional crane winch, the rotation speed of the drum 57 is increased in proportion to the operation amount of the winch lever 58. Therefore, when the winch lever 58 is rapidly tilted at the start of winding or winding, the rotation speed of the drum 57 rises rapidly, which causes loosening and irregular winding of the wire. Therefore, the operator has to pay attention to gradually perform the tilting operation of the winch lever 58 at the start of winding or winding.

However, no matter how careful the operator is, in the event of an emergency or the like, if the winch lever 58 is suddenly operated, or if the operator is a beginner, an accident will occur. Was even invited.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a winch for a crane in which the rotation speed of the drum does not rise rapidly even if the winch lever is rapidly operated. And a method of controlling the same. Further, according to the present invention, it is an object of the present invention to prevent loosening or irregular winding of a wire when it is hoisted or unwound by a crane winch.

[0008]

In order to achieve the above object, the present invention provides a hydraulic motor for rotating a drum for winding or winding a wire, and a main hydraulic pressure for supplying a hydraulic pressure to the hydraulic motor. Source, a control valve connected to the main hydraulic power source and the hydraulic motor for controlling the amount of hydraulic pressure supplied to the hydraulic motor, and a pilot hydraulic power source for the control valve. A winch for a crane, in which a pilot hydraulic pressure control means is provided between the winch and the pilot hydraulic power source and the control valve.

In the winch control method for a crane according to the present invention, while the amount of pilot hydraulic pressure for adjusting the opening area of the control valve is changed according to the operation amount of the winch lever, the acceleration of the drum is controlled by the wire. If it is within the set value of the acceleration that does not loosen, the amount of pilot hydraulic pressure is maintained as it is, and if the acceleration is equal to or greater than the set value of the acceleration that does not loosen the wire, an appropriate pilot hydraulic pressure is set so that the wire does not loosen. It is a control method that changes the amount of The pilot hydraulic pressure control means controls according to the control method of the present invention.

Specifically, in the crane winch of the present invention, in order to control the amount of pilot hydraulic pressure according to the acceleration of the drum and the operation amount of the winch lever,
Two proportional solenoid valves for hoisting and lowering are provided between the pilot hydraulic power source and the control valve, and further, an acceleration detector for detecting acceleration of the rotation speed of the drum, and an operation amount detection of a winch lever. And a calculating means for calculating an appropriate predetermined current value based on the acceleration of the drum and the operation amount of the winch lever and outputting the predetermined current to the proportional solenoid valve.

Then, the arithmetic means is controlled according to the control method of the crane winch of the present invention. Specifically, a predetermined current is output to the hoisting or lowering proportional solenoid valve according to the operation amount of the winch lever, and if the acceleration of the drum is within a set value of the acceleration at which the wire does not loosen, it is as it is. The output is maintained, and if the acceleration of the drum is equal to or greater than the set value of the acceleration that does not loosen the wire, an appropriate predetermined current value is calculated and output so that the acceleration does not loosen the wire.

[0012]

According to the above winch for crane of the present invention, since the arithmetic means outputs a predetermined current corresponding to the acceleration of the drum and the operation amount of the winch lever to the proportional solenoid valve, the two proportional solenoids are operated. The opening area of the valve can be adjusted according to the acceleration of the drum and the operation amount of the winch lever. The two proportional solenoid valves control the control valve pilot hydraulic pressure according to the acceleration of the drum and the operation amount of the winch lever. As a result, it becomes possible to control the amount of hydraulic pressure supplied to the hydraulic motor by the control valve in accordance with the acceleration of the drum and the operation amount of the winch lever.

When the computing means controls the pilot hydraulic pressure in accordance with the control method for the winch for crane of the present invention, even if the winch lever is rapidly operated,
Judging that the acceleration of the drum is equal to or greater than the set value of the wire slack acceleration, calculate and output an appropriate predetermined current value so that the wire does not slacken, and change it to an appropriate pilot hydraulic pressure. . As a result, even if the winch lever is rapidly operated, the rotation speed of the drum does not suddenly rise, and it is possible to prevent the wire from loosening or winding irregularly.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing the connection of each member in the crane winch of the present invention, FIG. 2 is a diagram showing an operation flow chart of the crane winch of the present invention, and FIG.
It is a graph which shows the rise of drum speed.

In FIG. 1, 1 is a lever operation amount detector,
2 is a computer, 3 and 4 are proportional solenoid valves for hoisting and lowering, respectively, 5 is a pilot hydraulic pressure source, 6 is a control valve, 7 is a main hydraulic pressure source, 8 is a hydraulic motor, 9
Is a speed reducer, 10 is a drum, 11 is a rotation detector, and 12 is a winch lever.

The lever operation amount detector 1 includes a winch lever 12 in a hoisting or lowering direction and a winch lever 12.
It is provided below the winch lever 12 in order to detect the amount of tilt operation. The computer 2 is connected to the lever operation amount detector 1, the hoisting and lowering proportional solenoid valves 3 and 4, and the rotation detector 11. The computer 2 calculates an appropriate predetermined current value on the basis of the acceleration of the drum and / or the operation amount of the winch lever and outputs the predetermined current to the proportional solenoid valve, and the acceleration detecting means. It also serves as the calculator of the vessel. The rotation detector 11 constitutes an acceleration detector together with the computer 2. The rotation detector 11 is arranged in the vicinity of the drum 10 to detect the rotation speed of the drum per unit time and output a rotation speed signal to the computer 2. It should be noted that the acceleration detector is not limited to the one in which the rotation speed detector 11 or the speed detector and the calculation unit that calculates the acceleration based on the speed detector are separated as in the present embodiment, and the rotation speed detection unit or the speed detector is not limited thereto. It may be an acceleration sensor in which the detection unit and the calculation unit are integrated.

The pilot oil pressure source 5 supplies the pilot oil pressure to the control valve 6 via the hoisting proportional solenoid valve 3 and hoisting hose 13, as well as the hoisting proportional solenoid valve 4 and the hoisting hose 14. Connected to the control valve 6. The opening areas of the hoisting and hoisting proportional solenoid valves 3 and 4 change according to a predetermined current output from the computer 2, and the pilot oil pressure supply amount from the pilot oil pressure source 5 to the control valve 6 is supplied to the drum. Control is performed based on the acceleration and / or the operation amount of the winch lever. The control valve 6 connects the main hydraulic power source 7 and the hydraulic motor 8 between the main hydraulic power source 7 and the hydraulic motor 8. And
The drive hydraulic pressure supplied from the main hydraulic pressure source 7 to the hydraulic motor 8 by changing the opening area of the control valve 6 according to the amount of pilot hydraulic pressure sent from the hoisting or lowering proportional solenoid valve 3 or 4. Control the supply amount of.

Next, the operation of the crane winch having the above structure will be described with reference to FIG. In 21, when the winch lever 12 is gradually tilted in the hoisting or lowering direction, the lever operation amount detector 1 detects the tilting operation amount of the winch lever 12, whether the tilting direction is winding or lowering, Output to the computer 2. At 22, the computer 2 determines whether it is winding or winding, and if it is winding, the winding proportional solenoid valve 3
Outputs a predetermined current so as to open in proportion to the amount of tilt operation of the winch lever 12. (If it is determined to be the lowering, the proportional lowering solenoid valve 4 outputs a predetermined current so as to open in proportion to the tilt operation amount of the winch lever 12.)

The hoisting proportional solenoid valve 3 receives the command of the computer 2 (when the hoisting proportional solenoid valve 4 judges that the hoisting operation is lowering), it is proportional to the tilt operation amount of the winch lever 12. The opening area is expanded and the amount of pilot hydraulic pressure from the pilot hydraulic pressure source 5 to the control valve 6 is increased. The control valve 6 expands its opening area in accordance with the increase in the amount of pilot hydraulic pressure, increases the amount of drive hydraulic pressure supplied from the main hydraulic pressure source 7 to the hydraulic motor 8, and increases the rotational speed of the hydraulic motor 8. . Accordingly,
The number of rotations of the drum 10 per unit time also increases. At that time, at 23, the rotation detector 11 detects the number of rotations of the drum 10 per unit time and outputs the rotation number signal to the computer 2.

At 24, the computer 2 calculates the acceleration based on the number of revolutions, and determines whether the acceleration is within a set value of the acceleration at which the wire does not loosen as shown in FIG. If the wire is within the set value of the acceleration that does not loosen, the current output to the hoisting proportional solenoid valve 3 (or the hoisting proportional solenoid valve 4 when it is determined to be hoisting) is maintained as shown in 25. . If the value is equal to or greater than the set value of the acceleration for not loosening the wire, an appropriate predetermined current value is calculated as shown in 26 so that the acceleration does not loosen the wire. Then, returning to 22 again, the predetermined current is output to the hoisting proportional solenoid valve 3 (the hoisting proportional solenoid valve 4 when it is determined to be hoisting), and the opening area of the proportional solenoid valve is adjusted.

As described above, according to the present invention, the pilot hydraulic pressure supplied to the control valve 6 is adjusted by adjusting the opening area of the proportional solenoid valve according to the acceleration of the drum 10 and / or the operation amount of the winch lever 12. Control the amount of. As a result, the amount of hydraulic pressure supplied from the main hydraulic pressure source by the control valve 6 to the hydraulic motor 8 is determined by the drum 10
Can be controlled according to the acceleration of the winch lever and / or the operation amount of the winch lever 12, and the rotation speed of the drum is controlled so as not to suddenly rise even if the winch lever is rapidly operated. It will be possible. for that reason,
It becomes possible to prevent loosening and irregular winding of the wire.

[Brief description of the drawings]

FIG. 1 is a view showing a connection of respective members in a crane winch according to the present invention.

FIG. 2 is a diagram showing an operation flow chart of the crane winch of the present invention.

FIG. 3 is a graph showing rise of drum speed.

FIG. 4 is a view showing a connection of each member in a conventional crane winch.

[Explanation of symbols]

 1 Lever operation amount detector 2 Computer 3 Proportional solenoid valve for hoisting 4 Proportional solenoid valve for hoisting 5 Pilot hydraulic power source 6 Control valve 7 Main hydraulic power source 8 Hydraulic motor 9 Speed reducer 10 Drum 11 Rotation detector 12 Winch lever

Claims (4)

[Claims] 1. A hydraulic motor for rotating a drum for winding or lowering a wire, a main hydraulic pressure source for supplying hydraulic pressure to the hydraulic motor, and a supply amount of hydraulic pressure to the hydraulic motor. A control valve connected to the main hydraulic pressure source and the hydraulic motor, a pilot hydraulic pressure source for the control valve, and an amount of pilot hydraulic pressure from the pilot hydraulic pressure source to the control valve. A winch for a crane, comprising: a pilot hydraulic pressure source and pilot hydraulic pressure control means connected to the control valve for controlling according to an acceleration and an operation amount of a winch lever. 2. The pilot hydraulic pressure control means controls the amount of pilot hydraulic pressure supplied to the control valve,
If the acceleration of the drum is within the set value of the acceleration that does not loosen the wire while changing according to the operation amount of the winch lever, that amount is maintained as it is, and the acceleration of the drum is set to the acceleration that does not loosen the wire. If the value is greater than or equal to
The winch for a crane according to claim 1, which is a control means for changing the amount of pilot hydraulic pressure to an appropriate value so that the wire does not loosen. 3. A hydraulic motor for rotating a drum for winding or lowering a wire, a main hydraulic power source for supplying hydraulic pressure to the hydraulic motor, and an amount of hydraulic pressure supplied to the hydraulic motor. A control valve connected to the main hydraulic pressure source and the hydraulic motor, a pilot hydraulic pressure source for the control valve, and hoisting and lowering provided between the pilot hydraulic pressure source and the control valve. Two proportional solenoid valves for use, an acceleration detector for detecting acceleration of the rotation speed of the drum, a winch lever operation amount detector, and an appropriate predetermined value based on the drum acceleration and the winch lever operation amount. Calculating means for calculating a current value and outputting the predetermined current to the hoisting or lowering proportional solenoid valve; A predetermined current is output to the hoisting or lowering proportional solenoid valve according to the operation amount of the inch lever, and if the acceleration of the drum is within the set value of the acceleration that does not loosen the wire, that output is maintained as it is. A winch for a crane, which is a calculating means for calculating and outputting an appropriate predetermined current value so that the acceleration of the wire does not become loose if the acceleration of the drum is equal to or more than a set value of the acceleration of not loosening the wire. 4. A winch for a crane for controlling the rotational speed of a drum by adjusting a hydraulic pressure supply amount from a main hydraulic pressure source to a hydraulic motor for rotating a drum for winding or lowering a wire by a control valve. A control method, wherein while varying the amount of pilot hydraulic pressure for adjusting the opening area of the control valve according to the operation amount of the winch lever, the acceleration of the drum is within a set value of the acceleration at which the wire does not loosen. For example, while maintaining the amount of pilot hydraulic pressure as it is, if the acceleration is equal to or greater than the set value of the acceleration that does not loosen the wire, change the crane winch to an appropriate amount of pilot hydraulic pressure so that the acceleration does not loosen the wire. Control method.