JPH0124072Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a clutch circuit for a winch drum capable of a half-clutch state.

[Prior Art] When working using two or more winch drums or a winch drum and another drive device,
A situation may arise where one winch drum is left idle and the other winch drum or other drive is working.

With the conventional hydraulically driven winch drum clutch circuit, the winch drum can only be driven in a non-driven state, but cannot be brought into a half-clutch state. Therefore, if one winch drum is allowed to play while working on another winch drum, the rope let out from the winch drum that is free will become slack. If the winch drum is operated while the rope is slack, the rope will wind loosely, or an impactful tension will be applied to the rope, damaging the rope and shortening its lifespan.

[Problems to be Solved by the Invention] In view of the above-mentioned circumstances, the present invention provides a clutch circuit for a winch drum that enables a half-clutch state.

[Means for Solving the Problems] In the present invention, a clutch cylinder for clutch engagement/disengagement is connected to a hydraulic power source via two routes via a shuttle valve, a clutch valve is provided in one route, and a clutch cylinder is provided in the other route. A switching valve and a pressure reducing valve are provided from the hydraulic pressure source side, and when the clutch valve is operated, the clutch is fully connected, and when the switching valve is switched, the reduced hydraulic pressure acts on the clutch cylinder, achieving a half-clutch state. It was designed to look like this.

[Example] Embodiments of the present invention will be described below based on the drawings.

1 in the figure is a drum clutch, and the clutch cylinder 2 and clutch plate 3 of the drum clutch 1 are attached to the output shaft system of the motor. When the clutch cylinder 2 is extended, the clutch plate 3 is expanded and the rotational force of the motor is is transmitted to the drum 4.

The clutch cylinder 2 is connected via a shuttle valve 5 to a hydraulic power source 8 by two lines 6, 7.

A clutch valve 9 is provided on one of the paths 6, and the clutch valve 9 is switched by an operating lever 10. The other path 7 is provided with an electromagnetic switching valve 11 and a pressure reducing valve 12 from the hydraulic pressure source 8 side, and the pressure reducing valve 12
The front and rear sides of are short-circuited via a check valve 13.

The solenoid valve 11 is operated by a switch (not shown) provided on the operating lever 10, etc., and when the solenoid valve 11 is not operated, the path 7 is cut off. .

In the circuit configured as described above, when the clutch valve 9 is switched by the operating lever 10 and the hydraulic power source 8 and the shuttle valve 5 are communicated, the pressure in the path 6 increases, the shuttle valve 5 is switched, and the clutch cylinder 2 is switched. The oil pressure of the oil pressure source 8 acts. clutch cylinder 2
is extended, the clutch plate 7 is enlarged, and the output shaft system of the motor and the drum 4 are completely connected.

Next, when the path 6 is disconnected, a switch (not shown) is operated to activate the solenoid valve 11, and the path 7 is brought into communication, the pressure in the path 7 increases, the shuttle valve 5 is switched, and the hydraulic source 8 Hydraulic pressure acts on the clutch cylinder 2. At this time, the pressure reducing valve 12 installed in the middle of the path 7 reduces the hydraulic pressure to the required set pressure.
The acting force of the clutch cylinder 2 is reduced. Therefore, when the load applied to the drum 4 is smaller than a predetermined value, the drum 4 is rotated by the motor,
When the value is larger than the specified value, the drum 4 and clutch plate 3
A half-clutch condition is realized in which slippage occurs between the clutches.

When the winch drum in the idle state is connected to the motor in the half-clutch state as described above, as soon as there is slack in the rope, it is immediately wound and a constant tension is applied to the rope when there is no slack. When the operating lever 10 is operated in this state, the clutch valve 9
is switched, and the oil pressure of the oil pressure source 8 acts on the shuttle valve 5. Since the hydraulic pressure at this time is not reduced, the shuttle valve 5 is switched, the unreduced hydraulic pressure acts on the clutch cylinder 2, and the output shaft system of the motor and the drum 4 are completely connected. At this time, if the switch is operated to return the solenoid valve 11, the hydraulic pressure acting on the shuttle valve 5 is released via the check valve 13.

As described above, even if the winch drum is operated from an idle state, the rope is always in a tensioned state, so that it is possible to prevent the rope from winding loosely.

In the above-described embodiment, the switching valve is a solenoid valve, but it is of course possible to use a switching valve other than a solenoid valve.

[Effects of the Invention] As described above, according to the present invention, the half-clutch state of the winch drum can be realized with a simple configuration.

[Brief explanation of the drawing]

The figure is a hydraulic circuit diagram of an embodiment of the present invention. 2 is a clutch cylinder, 5 is a shuttle valve, 6,
7 is a path, 8 is a hydraulic source, 9 is a clutch valve, 11 is an electromagnetic switching valve, and 12 is a pressure reducing valve.

Claims (1)

[Scope of utility model registration request] The clutch cylinder for clutch connection/disconnection is connected to a hydraulic power source through two routes via a shuttle valve, with a clutch valve provided on one route and a switching valve and a pressure reducing valve provided from the hydraulic power source side on the other route. Winch drum clutch circuit.