JPH0357037B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a control device for a hoisting winch having two hoisting drums on one drum shaft driven by a hydraulic motor, and is particularly applicable to crawler cranes and trucks. The present invention relates to a control device suitable for use in a hoisting winch mounted on an earth drill or the like.

[Conventional technology]

A conventional control device for a hoisting winch with two hoisting drums on one drum shaft includes one hoisting lever, two clutch levers, and two brake pedals to operate each hoisting drum. When doing so, the hoisting lever, clutch lever, and brake pedal are operated in conjunction. for example,
If one of the two hoisting drums is called the main hoisting drum and the other the auxiliary hoisting drum, when hoisting or lowering the main hoisting drum, (1) turn on the clutch on the main hoisting drum side and start the main hoisting drum; Connect the drum to the drum shaft, (2) Release the brake on the main drum side (turn off), (3)
Apply the brake on the auxiliary drum side (turn on),
(4) Disconnect the clutch between the auxiliary drum and the drum shaft, (5)
It performs operations such as operating the winding lever. Further, when winding up and lowering the auxiliary winding drum, the same operation as above is performed.

[Problem that the invention seeks to solve]

In the above conventional technology, when hoisting and lowering the hoisting drum, it is necessary to frequently operate three levers (one hoisting lever and two clutch levers), which results in poor work efficiency. It is easy to make mistakes in the operating procedure, and if you make a mistake in the operating procedure (such as releasing the brake pedal before turning on the clutch), there is a risk of an accident such as the suspended load falling. In addition, when stopping (holding) a suspended load midway, it is insufficient to simply return the hoisting lever to the neutral position (the load will gradually descend due to oil pressure leakage from the hydraulic motor), and the brake pedal must be depressed to brake. must be carried out.

An object of the present invention is to enable each hoisting drum (main hoisting drum, auxiliary hoisting drum) to be operated with a single operating lever, thereby improving work efficiency and eliminating errors in operating procedures. is possible,
Moreover, by switching the switching valve, the mode can be changed between "autobrake" mode and "neutral free" mode. In "autobrake" mode, when the operating lever is returned to the neutral position, the main winding drum and auxiliary winding drum are automatically switched. When stopping (holding) a suspended load midway, it is no longer necessary to use the brake pedal to stop the load.
In the mode, when the operating lever is returned to the neutral position, the main hoisting drum and the auxiliary hoisting drum are put into a state of free rotation, and the object is to provide a control device for a hoisting winch that can perform free fall of a suspended load.

[Means for solving problems]

The above purpose is to rotatably support two hoisting drums on one drum shaft driven by a hydraulic motor, and to connect one of the hoisting drums and the drum shaft.
A hydraulic cylinder for a clutch that performs disconnection, a hydraulic cylinder for a brake and a brake pedal that brakes the hoisting drum, a hydraulic cylinder for a clutch that connects and disconnects the other hoisting drum and the drum shaft, A hoist comprising a brake hydraulic cylinder and a brake pedal for controlling an upper drum, and in which a direction control valve for controlling the direction of hydraulic pressure to the hydraulic motor can be switched by two pilot valves. In the winch, each of the above-mentioned hydraulic cylinders for the clutch is configured so that the clutch is turned off when hydraulic pressure is applied, and the clutch is turned on by a spring force when the hydraulic pressure is released, and each of the above-mentioned hydraulic cylinders for the brake is configured so that the clutch is turned on when hydraulic pressure is applied.
Off, the spring force will brake when the hydraulic pressure is released.
The clutch hydraulic cylinder of one hoisting drum is configured to be turned ON, and has a position where the clutch hydraulic cylinder of one hoisting drum is connected to the oil tank side and a position where it is connected to the hydraulic power source side, so that when one pilot valve is operated, the clutch hydraulic cylinder of one hoisting drum is A first switching valve that switches to a position connected to the oil tank side by the pilot pressure and returns to the other position when the pilot pressure disappears, and connects the hydraulic cylinder for the clutch of the other hoisting drum to the oil tank side. When the other pilot valve is operated, the pilot pressure from the pilot valve switches to the oil tank side, the connecting position, and when the pilot pressure disappears, the other position is connected. It has a second switching valve that returns to the position, a position that connects the brake hydraulic cylinder of one hoisting drum to the oil tank side, and a position that connects it to the hydraulic power source side, so that when one pilot valve is operated, the pilot valve A third switching valve that switches to a position connected to the hydraulic source side by pilot pressure from the valve and returns to the other position when the pilot pressure disappears, and a hydraulic cylinder for the brake of the other hoisting drum are connected to the oil tank side. When the other pilot valve is operated, the pilot pressure from the pilot valve switches to the position where it connects to the oil tank side, and when the pilot pressure disappears, a fourth switching valve that returns to the other position; a position that connects the inlet side of the first switching valve that has returned to the position connected to the hydraulic pressure source side to the oil tank side; and a position that connects the inlet side to the hydraulic power source. , a fifth switching valve that switches to a position connected to the hydraulic source side by pilot pressure from the other pilot valve when the other pilot valve is operated, and switches to the other position when the pilot pressure disappears; The inlet side of the second switching valve has returned to the position where it is connected to the oil tank side and the position where it is connected to the hydraulic source side, and the pilot pressure from one pilot valve causes the inlet side to be connected to the hydraulic source side. By providing a sixth switching valve that switches to the connected position and switches to the other position when the pilot pressure disappears, and selects a position for supplying pressure oil from the hydraulic source and a position for draining oil to the oil tank. , a first selection switching valve that switches the clutch and brake system of one hoisting drum between automatic brake mode and neutral free mode, and a clutch and brake system of the other hoisting drum that switches the mode between automatic brake mode and neutral free mode. The second mode to switch to
This is achieved by providing a configuration with a selection switching valve.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. The figure shows a hydraulic circuit diagram for controlling a hoisting winch according to the invention. This hydraulic circuit consists of a circuit for driving the drum shaft, a pilot circuit for operating the directional control valve included in the drive circuit, and a circuit for controlling the clutches and brakes for the two hoisting drums.

A main drum 2 and an auxiliary drum 3 are rotatably supported on the drum shaft 1 via bearings, respectively. On the main winding drum 2 side, there is a clutch hydraulic cylinder (hereinafter referred to as a clutch cylinder) 4 that connects and disconnects the main winding drum 2 and the drum shaft 1.
A brake hydraulic cylinder (hereinafter referred to as a brake cylinder) 5 for braking the main winding drum 2 and a brake pedal 6 are provided. Also,
Also on the auxiliary drum 3 side, the auxiliary drum 3 and drum shaft 1
A clutch hydraulic cylinder (hereinafter referred to as a clutch cylinder) 7 that connects and disconnects the auxiliary drum 3, a brake hydraulic cylinder (hereinafter referred to as a brake cylinder) 8 that brakes the auxiliary drum 3, and a brake pedal 9 are provided. There is.

The clutch cylinder 4 on the main winding drum 2 side rotates together with the drum shaft 1, and expands and contracts due to the spring force of a built-in spring 4a and the hydraulic pressure acting on the oil chamber 4b. The clutch lining 10 is expanded by the force and pressed against the main winding drum 2, and the main winding drum 2 is connected to the drum shaft 1, and when hydraulic pressure is applied, the clutch lining 10 is separated from the main winding drum 2 and the main winding is started. Separate the drum 2 from the drum shaft 1. The brake cylinder 5 is designed to expand and contract due to the spring force of a built-in spring 5a and the hydraulic pressure acting on the oil chamber 5b. When the hydraulic pressure is released, the brake cylinder 5 contracts due to the spring force and the brake lining 12 is moved through the link 11. It is pressed against the main drum 2 to brake the main drum 2, and when hydraulic pressure is applied, it expands and separates the brake lining 12 from the main drum 2 via the link 11 to release the brake. When the brake pedal 6 is depressed, it presses the brake lining 12 against the main winding drum 2 via a link 11 to brake the main winding drum 2.

The clutch cylinder 7 on the side of the auxiliary drum 3 rotates together with the drum shaft 1 in the same way as the clutch cylinder 4, and expands and contracts by the spring force of a built-in spring 7a and the hydraulic pressure acting on the oil chamber 7b. When the hydraulic pressure is released, the clutch lining 13 is expanded by the spring force and pressed against the auxiliary winding drum 3.
When the auxiliary winding drum 3 is connected to the drum shaft 1 and hydraulic pressure is applied, it shrinks and the clutch lining 13
is separated from the auxiliary winding drum 3 to separate the auxiliary winding drum 3 from the drum shaft 1. The brake cylinder 8 is designed to expand and contract due to the spring force of a built-in spring 8a and the hydraulic pressure acting on the hydraulic pressure 8b. When the hydraulic pressure is released, the brake cylinder 8 contracts due to the spring force and compensates for the brake lining 15 via the link 14. It is pressed against the winding drum 3 to brake the auxiliary winding drum 3, and when hydraulic pressure is applied, it expands and separates the brake lining 15 from the auxiliary winding drum 3 via the link 14 to release the braking. When the brake pedal 9 is depressed, the link 14
The brake lining 15 is connected to the auxiliary winding drum 3 through
to brake the auxiliary winding drum 3.

The driving circuit for the drum shaft includes a hydraulic motor 16 that rotates the drum shaft 1 forward (upward side) and reversely (downward side) via a speed reducer 17, and supplies pressure oil to the hydraulic motor 16. a hydraulic pump 18 that drives this; a pilot-type directional control valve 19 that is interposed between the hydraulic pump 18 and the hydraulic motor 16 and switches the direction of pressure oil to the hydraulic motor 16; A counterbalance valve 20 is provided between the hydraulic motor 16 and the hydraulic motor 16 to prevent the hydraulic motor 16 from running away.

The pilot circuit for operating the directional control valve includes a first pilot valve 21, a second pilot valve 22, and a pilot hydraulic pump 23. When the operating lever 24 of the first pilot valve 21 is moved to the hoisting side, one switching section 21a switches between the pilot hydraulic pump 23 and the pilot circuit 25A.
The other switching part 21b connects the pilot circuit 25B and the oil tank 26, and the pilot pressure oil is passed through the shuttle valve 27 to the directional control valve 1.
9 to the hoisting position A.
When the control lever 24 is moved to the lower side, the switching part 21b connects the pilot circuit 25B and the pilot hydraulic pump 23, and the switching part 21a connects the pilot circuit 25A and the oil tank 26, and the pilot Pressure oil is applied to the other pressure-receiving portion of the direction-side valve 19 through the shuttle valve 28 to switch it to the lowering position B. Furthermore, when the operating lever 29 of the second pilot valve 22 is moved to the hoisting side, the switching valve 22a connects the pilot circuit 25A and the pilot hydraulic pump 23, and the switching section 22
b connects the pilot circuit 25B and the oil tank 26, causes pilot pressure oil to act on one pressure receiving part of the directional control valve 19 through the shuttle valve 27 to switch it to the hoisting position A, and also controls the operation lever 29.
When moved to the lower side, the switching part 22b connects the pilot circuit 25B to the pilot hydraulic pump 23, and the switching part 22a connects the pilot circuit 25A and the oil tank 26 to direct the pilot pressure oil through the shuttle valve 28. This can be switched to the lowering position B by acting on the other pressure receiving part of the control valve 19. Note that when the operating levers 24 and 29 of the first and second pilot valves 21 and 22 are returned to the non-operating position, the pilot circuits 25A and 25B are connected to the oil tank 26 by the switching part, and the directional control valve 19 is activated by the spring 1.
Switched to the neutral position by spring force 9a.

The clutch and brake control circuit includes:
The pilot hydraulic pump 23 is used as a hydraulic power source, and two selection switching valves 3 are also used.
0, 31, and six switching valves 32 to 37.

The selection switching valves 30 and 31 are connected in parallel to the pilot hydraulic pump 23 and the oil tank 26 at their inlet sides. By operating the select levers 30a, 31a, the outlet side can be switched to port position A, which connects the outlet side to the pilot hydraulic pump 23 side, and port position B, which connects the outlet side to the oil tank 26 side.

The switching valve 32 is provided with its inlet side connected to the outlet side of the selection switching valve 30 and the pilot hydraulic pump 23 side, and its outlet side connected to the oil chamber 5b of the brake cylinder 5 on the main winding drum 2 side. ing. The switching valve 33 has an inlet side connected to the oil tank 26 side and an outlet side of a switching valve 34 to be described later,
The outlet side thereof is connected to the oil chamber 4b of the clutch cylinder 4 on the main winding drum 2 side via the rotary joint 38. The switching valve 34 is provided with an inlet side connected to the outlet side of the select switching valve 30 and the pilot hydraulic pump 23 side, and an outlet side connected to the inlet side of the switching valve 33. The switching valve 35 is the switching valve 31 for selecting the inlet side.
and the pilot hydraulic pump 23 side, and the outlet side is connected to the oil chamber 8b of the brake cylinder 8 on the auxiliary drum 3 side. The switching valve 36 has an inlet side connected to the oil tank 26 and an outlet side of a switching valve 37 to be described later, and an outlet side connected to the hydraulic pressure 7b of the clutch cylinder 7 on the auxiliary drum 3 side via a rotary joint 39. It is provided. The switching valve 37 is provided so that its inlet side is connected to the outlet side of the select switching valve 31 and the pilot hydraulic pump 23 side, and its outlet side is connected to the inlet side of the switching valve 36.

Each of the above switching valves 32, 33, 37 is operated by the spring force of a spring and the shuttle valve 4 from the first pilot valve 21.
The switching valves 34, 35, and 36 are switched by the spring force of the spring and the pilot hydraulic pressure guided from the second pilot valve 22 via the shuttle valve 41. It is becoming more and more popular.

That is, the switching valve 32 is connected to a port position B whose outlet side is connected to the outlet side of the select switching valve 30 by the spring force of the spring 32a, and a port whose outlet side is connected to the pilot pressure oil pump 23 side by pilot pressure oil. They each switch to position A. The switching valve 33 is
Due to the spring force of the spring 33a, the outlet side is connected to the switching valve 34.
Port position B, which is connected to the outlet side of the oil tank 26, is switched by pilot pressure oil to port position A, whose outlet side is connected to the oil tank 26 side. The switching valve 37 is
The spring force of the spring 37a switches the port position B, where the outlet side is connected to the outlet side of the select switching valve 31, and the port position A, where the outlet side is connected to the pilot hydraulic pump 23, by pilot pressure oil.

The switching valve 34 is connected to a port position B where the outlet side is connected to the outlet side of the select switching valve 30 by the spring force of the spring 34a, and to a port position B where the outlet side is connected to the pilot hydraulic pump 23 side by pilot hydraulic pressure. They each switch to A. Switching valve 35
is a port position B whose outlet side is connected to the outlet side of the selection switching valve 31 by the spring force of the spring 35a.
Then, the outlet side is switched to the port position A where the outlet side is connected to the pilot hydraulic pump 23 side by the pilot pressure oil. The switching valve 36 is switched to port position B where the outlet side is connected to the outlet side of the switching valve 37 by the spring force of the spring 36a, and to port position A where the outlet side is connected to the oil tank 26 side by pilot pressure oil. Change.

In the figure, reference numeral 42 denotes a relief valve that keeps the pilot pressure generated from the pilot hydraulic pump 23 constant.

Next, the operation of this embodiment will be explained.

In this embodiment, the selection switching valves 30, 31
When set to point position B, the mode becomes "auto brake" in which the brake is automatically applied when the hoist lever is in the neutral position, and when the selector valves 30 and 31 are set to port position A, the automatic brake does not work when the hoist lever is in the neutral position. , it becomes a "neutral free" mode where you can perform freefall operations.

First, a case will be described in which the selection switching valves 30 and 31 are switched to port position B to set the "automatic brake" mode. In this state, the first
Each operation lever 2 of the second pilot valve 21, 22
4 and 29 are placed in the neutral position, the pilot pressure oil from the pilot hydraulic pump 23 is unloaded, the directional control valve 19 is switched to the neutral position by the spring force of the spring 19a, and the hydraulic pump 18 is operated to unload the oil pressure. Motor 16 stops. On the other hand, each switching valve 32 to 37 has a spring 32a to 37a, respectively.
The pressure oil in the brake cylinder 5 on the main winding drum 2 side is discharged to the oil tank 26 through the switching valve 32 and the selection switching valve 30, and the clutch cylinder 4 is switched to the port position B by the spring force.
Pressure oil flows through the rotary joint 38, the switching valve 33,
34 and select switching valve 31 to the oil tank 26, the brake cylinder 5 is contracted by the spring force and the brake is turned on, and the clutch cylinder 4 is expanded by the spring force and the clutch is turned on. Further, the pressure oil in the brake cylinder 8 on the auxiliary drum 3 side is discharged to the oil tank 26 through the switching valve 35 and the selection switching valve 31, and the clutch cylinder 7
Pressure oil flows through the rotary joint 39, the switching valve 36,
37 and select switching valve 31 to the oil tank 26, the brake cylinder 8 is contracted by the spring force and the brake is turned on, and the clutch cylinder 7 is expanded by the spring force and the clutch is turned on. That is, when the hoisting levers 24 and 29 are placed in the neutral position, the drum shaft 1 stops, and the brakes and clutches on the main hoisting drum 2 side and the brakes and clutches on the auxiliary hoisting drum 3 side are all automatically turned on, and the main hoisting Both the drum 2 and the auxiliary drum 3 are braked.

In this state, for example, the first pilot valve 2
When the operating lever 24 of 1 is operated to the hoisting side or the hoisting down side, pilot pressure oil from the pilot hydraulic pump 23 is guided to the direction control valve 19 through the shuttle valve 27 or 28, and the direction control valve 19 is activated to the hoisting side. The position is switched to position A or lowering position B, and the hydraulic motor 16 is in a state of rotating to the upper or lower side. On the other hand, a portion of the pilot hydraulic pressure from the pilot hydraulic pump 23 is guided to the switching valves 32, 33, and 37 via the shuttle valve 40, and these switching valves are switched to port position A, respectively. As a result, the pressure oil of the pilot hydraulic pump 23 is guided through the port position A of the switching valve 32 to the hydraulic pressure 5b of the brake cylinder 5 on the main winding drum 2 side, and the brake cylinder 5 is extended by the hydraulic pressure and the brake is turned off. becomes. Even when the switching valve 33 is switched to the port position A, the oil chamber 4b of the clutch cylinder 4 is connected to the oil tank 26.
Since the clutch cylinder 4 remains extended by the spring force, the clutch will continue to be in the ON state.
In addition, by switching the switching valve 37, the pressure oil of the pilot hydraulic pump 23 passes through the port position A of the switching valve 37, the port position B of the switching valve 36, and the rotary joint 39 to the oil chamber of the clutch cylinder 7 on the auxiliary drum 3 side. 7b, the clutch cylinder 7
is contracted by hydraulic pressure and the clutch becomes OFF. In other words, when the hoisting lever 24 is operated to the hoisting side or the hoisting down side, the main hoisting drum 2 side turns the clutch ON and the brake OFF, and the auxiliary hoisting drum 3 side turns the brake ON and the clutch OFF, and the main hoisting drum 2 side turns the clutch ON and the brake OFF. Only the drum 2 rotates together with the drum shaft 1 toward the winding up side or the winding down side.

The above is the operating lever 24 of the first pilot valve 21.
In this case, the second pilot valve 22
When operating the operating lever 29, the switching valve 3
4, 35, and 36 are switched to port position A by the pilot pressure oil guided through the shuttle valve 41, and the clutch is turned ON and the brake is turned on on the auxiliary drum 3 side.
Off, and the brake on the main drum 2 side is turned on.
When the clutch is turned off, only the auxiliary winding drum 3 rotates together with the drum shaft 1 toward the winding up side or the winding down side.

Next, a case will be described in which the operating lever 24 of the first pilot valve 21 is operated, for example, to the hoisting side, and then the operating lever 29 of the second pilot valve 22 is operated to the hoisting side.

When the operating lever 24 is operated to the winding side, the clutch on the main winding drum 2 side is turned ON as explained earlier.
The brake is turned off, and the main winding drum 2 rotates to wind up. When the operating lever 29 is operated to the hoisting side from this state, pilot pressure oil is guided to the direction control valve 19 via the shuttle valve 41. Since it has already been switched to the hoisting position A, the hydraulic motor 16 continues to rotate in the hoisting direction. On the other hand, a portion of the pilot pressure oil generated by operating the operating lever 29 is transferred to the switching valve 3 via the shuttle valve 41.
4, 35 and 36, these switching valves are switched to port position A. Even when the switching valve 34 is switched to the port position A, the pressure oil in the clutch cylinder 4 on the main winding drum 2 side has already been discharged from the oil tank 26 through the port position A of the switching valve 33. It does not change for clutch ON of 4. When the switching valve 35 is switched to port position A, the pressure oil of the pilot pressure oil pump 23 is transferred to the switching valve 3.
The oil is guided to the oil chamber 8b of the brake cylinder 8 on the side of the auxiliary drum 3 through the port position A of No. 5, and the brake cylinder 8 is expanded by the spring force to turn the brake off. Furthermore, by switching the switching valve 36 to port position A, the pressure oil in the clutch cylinder 7 is discharged into the oil tank 26 through the rotary joint 39 and port position A of the switching valve 36, and the clutch cylinder 7 is It is extended by the spring force and the clutch is in the ON state. In other words, the auxiliary drum 3 side is also clutched.
ON, the brake is turned OFF, and the auxiliary winding drum 3 and the main winding drum 2 rotate toward the winding side at the same speed.

Note that if the operating lever 29 of the second pilot valve 22 is operated first and then the operating lever 24 of the first pilot valve 21 is operated, the auxiliary winding drum 3 will rotate first, and then the main winding drum 2 will rotate. Rotate. In addition, when both hoisting drums are rotating, for example, when the operating lever 29 is returned to neutral, the brake on the auxiliary hoisting drum 3 side is turned on and the clutch is turned on.
Off, and the auxiliary drum 3 stops.

Next, a description will be given of the operation when the select switching valves 30 and 31 are respectively switched to port position A by operating the select bars 30a and 31a to enter the "neutral free" mode.

In this state, the first and second pilot valves 2
When the operating levers 24 and 29 of 1 and 22 are in the neutral position, the switching valves 32 to 37 are all switched to port position B, so on the main drum 2 side, the pilot pressure oil of the pilot hydraulic pump 23 is used for selection. The oil chamber 5 of the brake cylinder 5 passes through port position A of the switching valve 30 and port position B of the switching valve 32.
b, the brake cylinder 5 is extended by hydraulic pressure and the brake is turned off, and the pressure oil of the pilot hydraulic pump 23 is supplied to the selection switching valve 3.
0 port position A, switching valve 34 port position B,
The oil chamber 4b of the clutch cylinder 4 passes through the port position B of the switching valve 33 and the rotary joint 38.
The clutch cylinder 4 is compressed by hydraulic pressure and the clutch is turned off. In other words, the main winding drum 2 is turned off with the clutch turned off and the brake turned off, and can rotate freely. On the auxiliary drum 3 side, pressure oil from the pilot hydraulic pump 23 is supplied to the oil chamber 8b of the brake cylinder 8 through port position A of the selection switching valve 31 and port position B of the switching valve 35. The brake cylinder 8 is extended by hydraulic pressure and the brake is turned off, and the pressure oil of the pilot hydraulic pump 23 is applied to port position A of the selection switching valve 31, port position B of the switching valve 37, port position B of the switching valve 36, and The oil is supplied to the oil chamber 7b of the clutch cylinder 7 through the rotary joint 39, and the clutch cylinder 7 is contracted by the hydraulic pressure and the clutch is turned off.In other words, the auxiliary drum 3 is turned off with the clutch turned off and the brake turned off, and rotates freely. It becomes possible. Therefore, if the main winding drum 2 and the auxiliary winding drum 3 are lifting a load, free fall can be performed. At this time, the main winding drum 2 and the auxiliary winding drum 3 are braked by depressing the brake pedals 6 and 9, respectively.

Next, the operation when the operation lever 24 is operated, for example, to the winding side from this state will be explained. When the operating lever 24 is operated in the hoisting direction, the pilot pressure oil switches the directional control valve 9 to the upper position A for winding, and the hydraulic motor 16 rotates in the hoisting direction.
The pilot pressure oil switches the switching valves 32, 33, and 37 to port position A, respectively. As a result, the pressure oil of the pilot hydraulic pump 23 is supplied to the oil chamber 5b of the brake cylinder 5 on the main winding drum 2 side through the port position A of the switching valve 32, and the brake cylinder 5 is expanded by the hydraulic pressure, and the brake is turned off. At the same time, the pressure oil in the clutch cylinder 4 is transferred to the rotor joint 38 and the port position A of the switching valve 33.
The oil is discharged through the oil tank 26, and the clutch cylinder 24 is expanded by the spring force, turning the clutch ON. Furthermore, by switching the switching valve 37 to port position A, the pressure oil of the pilot hydraulic pump 23 passes through port position A of the switching valve 37 and port position B of the switching valve 36 to the clutch cylinder 7 on the auxiliary drum 3 side.
Since the oil continues to be supplied to the oil chamber 7b, the clutch cylinder 7 is contracted by the hydraulic pressure and the clutch remains OFF. In other words, the clutch on the main winding drum 2 side
ON, the brake is turned OFF, the main winding drum 2 winds up and rotates, and the auxiliary winding drum 3 remains in a state where it can perform free fall with the clutch OFF and the brake OFF. Note that when the operating lever 29 is operated to the winding side, the auxiliary winding drum 3 rotates to wind up, and the main winding drum 2 remains in a state in which it can perform free fall.

Furthermore, when the operating lever 24 is operated to the hoisting side and then the operating lever 29 is operated to the hoisting side, the clutch on the main hoisting drum 2 side is switched to the port position A of the switching valves 32, 33, and 37. but
ON, the brake is turned OFF, the main winding drum 2 rotates to the winding side, and then the switching valves 34, 35, 36
auxiliary drum 3 by switching to port position A.
The side clutch is ON and the brake is OFF,
The auxiliary winding drum 3 rotates to the winding side.

As described above, according to this embodiment, the main winding drum 2,
Each operation of the auxiliary hoisting drum 3 (hoisting and hoisting) can be performed with a single operating lever, which improves work efficiency, and when operating each hoisting drum, move the operating lever to the hoisting or hoisting side. Since you only need to move it to the side, the operating procedure is extremely simple and eliminates operational errors.

Furthermore, in this embodiment, switching the selection switching valves 30 and 31 to port position B enables the "automatic brake" mode, and switching the selection switching valves 30 and 31 to port position A enables the "neutral free" mode. When the operating levers 24 and 29 are returned to the neutral position while in the "auto brake" mode, the main hoist drum 2 and auxiliary hoist drum 3 are automatically braked, stopping (holding) the suspended load midway. This makes it possible to eliminate the need for brake operation using the brake pedal when Furthermore, when the operating levers 24 and 29 are returned to the neutral position in the "neutral free" mode, the main winding drum 2 and the auxiliary winding drum 3 become in a state of free rotation, and the suspended load can be free-falled.

In addition, in the above embodiment, if the operating lever 24 is accidentally operated to the hoisting side and the operating lever 29 is operating to the hoisting down side (both hoisting drums 2 and 3 are in the clutch ON and brake OFF states), The pilot pressure oil for hoisting and lowering acts on the directional control valve 19, and the stronger one (the one with higher pilot pressure)
In other words, there is a risk that the hoisting drum will rotate in that direction due to the larger stroke of the operating lever, but as shown in Figure 2, there is an interlock mechanism in the pilot circuit for operating the directional control valve. This can be solved by providing .

That is, interlock switching valves 40 to 43 are provided in each outlet side circuit of both pilot valves 21 and 22, and these switching valves 40 to 43 are connected to port position A by the pilot pressure oil of the pilot valve on the other side.
is switched from port position B to directional control valve 1.
It is designed to cut off the pilot pressure oil to 9.

For example, when the operation lever 24 is operated to the hoisting side, the pilot pressure oil from the first pilot valve 21 acts on the directional control valve 19 through the port position A of the switching valve 42 and the shuttle valve 27, and moves it to the hoisting position. Switch to A. At this time, the first pilot valve 21
A portion of the pilot pressure oil from the port acts on the switching valve 41, and the switching valve 41 is switched to the port position B.
Therefore, at this time, even if pilot pressure is built up on the lower side of the second pilot valve 22 by operating the operating lever 29 to the lower side (opposite direction to the operating lever 24), the pilot pressure oil will not flow through the cutoff valve 41. Since the directional control valve 19 is cut off, it does not act on the directional control valve 19. Further, the pilot pressure oil from the second pilot valve 22 switches the switching valve 42 from port position A to port position B, and the pilot pressure oil from the first pilot valve 21 is also cut off, so that both ends of the directional control valve 19 are The pilot pressure oil is not applied and the directional control valve 19 returns to the neutral position. In this way, when the operating lever 24 and the operating lever 29 are operated in the opposite direction, the pilot pressure oil to the directional control valve 19 is cut off by the action of the interlock mechanism, the directional control valve 19 becomes neutral, and the hydraulic pump 18 is in an unloading state, and the hydraulic motor 16 is stopped to stop the main winding drum 2 and the auxiliary winding drum 3. Further, the case where the operating lever 24 is operated to the lower side and the operating lever 29 is operated to the lower side is the same as described above.

Although FIG. 1 shows an example in which the pilot hydraulic pump 23 of the pilot circuit for operating the directional control valve is used as the hydraulic source for the clutch and brake control circuits, it is also possible to use a unique hydraulic pump. good.

〔Effect of the invention〕

As explained above, according to the present invention, each hoisting drum can be operated using a single operating lever, so work efficiency can be improved, and when operating each hoisting drum, the operating lever can be used to operate each hoisting drum. Since it is only necessary to move it to the upper or lower side, the operating procedure is extremely simple and eliminates operational errors.
In addition, by switching the selector valve, the mode can be changed between "autobrake" mode and "neutral free" mode. In "autobrake" mode, when the operating lever is returned to the neutral position, the main winding drum and auxiliary winding drum are automatically switched. The brake is applied automatically, making it unnecessary to operate the brake using the brake pedal when stopping (holding) a suspended load midway. In the "neutral free" mode, when the operating lever is returned to the neutral position, the main drum and the auxiliary drum are in a state of free rotation, allowing free fall of the suspended load.

[Brief explanation of drawings]

FIG. 1 is a hydraulic circuit diagram showing an embodiment of the hoisting winch control device of the present invention, and FIG. 2 is a pilot circuit diagram for operating a directional control valve equipped with an interlock mechanism. 1...Drum shaft, 2...Main winding drum, 3...Auxiliary winding drum, 4, 7...Hydraulic cylinder for clutch,
4a, 7a... Spring, 4b, 7b... Oil chamber, 5,
8... Brake hydraulic cylinder, 5a, 8a...
Spring, 5b, 8b... Oil chamber, 6, 9... Brake pedal, 11, 14... Link, 16... Hydraulic motor, 18... Hydraulic pump, 19... Directional control valve, 19a... Spring, 21 ...First pilot valve, 22...Second pilot valve, 23...Pilot hydraulic pump, 24, 29...Operation lever, 2
5A, 25B... Pilot circuit, 26... Oil tank, 27, 28... Shut valve, 30, 31...
...Select switching valve, 30a, 31a...Select lever, 32-37...Switching valve, 32a, 37
a...Spring, 40-42...Interlock switching valve.

Claims (1)

[Claims] 1 A clutch hydraulic cylinder that rotatably supports two hoisting drums on one drum shaft driven by a hydraulic motor, and connects and disconnects one of the hoisting drums and the drum shaft; A brake hydraulic cylinder and brake pedal that brake the drum, a clutch hydraulic cylinder that connects and disconnects the other hoisting drum and the drum shaft, and a brake hydraulic cylinder and brake that brakes the hoisting drum. In the hoisting winch, which is equipped with a pedal, and in which two pilot valves are used to switch a direction control valve that controls the direction of hydraulic pressure to the hydraulic motor, each of the hydraulic cylinders for the clutches is When pressure is applied, the clutch
Off, when the hydraulic pressure is released, the spring force will cause the clutch to close.
When hydraulic pressure is applied to each of the brake hydraulic cylinders mentioned above, the brake is turned off.
It is configured so that the brake is turned on by spring force when the hydraulic pressure is released, and has a position where the clutch hydraulic cylinder of one hoisting drum is connected to the oil tank side and a position where it is connected to the hydraulic source side.
When one pilot valve is operated, the pilot pressure from the pilot valve switches to the position connected to the oil tank side, and when the pilot pressure disappears, the first position returns to the other position.
It has a switching valve, a position for connecting the hydraulic cylinder for the clutch of the other hoisting drum to the oil tank side, and a position for connecting it to the hydraulic power source side, and when the other pilot valve is operated, it is controlled by the pilot pressure from the pilot valve. A second switching valve that switches to a position connected to the oil tank side and returns to the other position when the pilot pressure disappears, and a position and hydraulic pressure that connects the brake hydraulic cylinder of one hoisting drum to the oil tank side. It has a position connected to the hydraulic power source side, and when one pilot valve is operated, it switches to the position connected to the hydraulic power source side due to the pilot pressure from the pilot valve, and returns to the other position when the pilot pressure disappears. It has a third switching valve, a position where the brake hydraulic cylinder of the other hoisting drum is connected to the oil tank side, and a position where it is connected to the hydraulic pressure source side, and when the other pilot valve is operated, the pilot valve is a fourth switching valve that switches to a position connected to the oil tank side due to pressure and returns to the other position when the pilot pressure disappears; and a fourth switching valve that returns to the position connected to the hydraulic power source. It has a position where the inlet side is connected to the oil tank side and a position where it is connected to the hydraulic source side, and when the other pilot valve is operated, the pilot pressure from the pilot valve switches to the position where the inlet side is connected to the hydraulic source side. A fifth switching valve that switches to the other position when the pilot pressure disappears, and a position that connects the inlet side of the second switching valve to the oil tank side, which has returned to the position that connects to the hydraulic source side, and the hydraulic source side. and a sixth switching valve which has a position connected to the hydraulic power source side, switches to a position connected to the hydraulic power source side by pilot pressure from one pilot valve, and switches to the other position when the pilot pressure disappears, The first selection switch switches the clutch and brake system of one hoisting drum between automatic brake mode and neutral free mode by selecting the position for supplying pressure oil from the hydraulic source and the position for draining oil to the oil tank. A second valve, a clutch for the other hoisting drum, and a second mode switch for switching the brake system between automatic brake mode and neutral free mode.
A control device for a hoisting winch, characterized in that it is provided with a selection switching valve.