JPH02182698A - Winch - Google Patents

Abstract

PURPOSE:To regulate the rotation speeds of both drums according to loads and facilitate the running operation of a winch by providing such a constitution as switching a solenoid valve to connect a shuttle valve side circuit to a clutch hydraulic cylinder in the operation under a free falling mode state. CONSTITUTION:In the winding operation at free falling mode, a circuit on shuttle valves 231, 331 side is connected to the clutch hydraulic cylinders 201, 301. Thus, a low-pressure pressure oil passing a circuit extended from the pilot pressure oil circuit of an operation value is first supplied to the clutch hydraulic cylinder, and a drum is connected to a drum shaft 101 in the semi-clutch state, and when the pressure of the pilot pressure oil circuit exceeds the operation set pressure of pilot valves 211, 311, the pilot valves are switched, a high- pressure pressure oil passing the pilot valves is supplied to the clutch hydraulic cylinder to make the clutch in a complete connected state. Thus, in the state where the clutch of one drum is completely connected, the other drum can be connected in the semi-clutch state.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a winch with one shaft and two drums mounted on a pile driver, a crane, an earth drill, etc., and particularly relates to a winch that is easy to operate.

[Conventional technology]

For example, a conventional winch 1 shown in FIG. 5 has two drums 4.
5 are rotatably supported, and each drum 4,
5, a clutch hydraulic cylinder 41.51 that connects and disconnects the drum 4.5 and the drum shaft 3, and a drum 4.5.
Brake pedals 42 and 52 for braking and releasing the brakes are provided.

The direction of the pressure oil from the hydraulic pump 9 is switched by the direction switching valve 8 which is switched by the pilot pressure oil generated in the operation pilot valve 7 by the tilting of the operation lever 6, and the hydraulic motor 2 is operated in the hoisting direction or in the winding direction. Drum shaft 3 is driven in the downward direction.

Further, the clutch hydraulic cylinders 41.51 are controlled to supply and discharge pressure oil from the hydraulic pump 10 by operating operating levers 43.53, respectively, and are connected to the drums 4, 5 and the drum shaft 3.
Connect/disconnect with.

Therefore, in order to operate the winch 1, it is necessary to frequently operate three operating levers: the operating lever 6 of the hydraulic motor 2, the operating lever 43, 53 of the clutch hydraulic cylinder 41, 51, and the brake pedal 42, 52. This requires skill and, for example, there is a risk that the suspended load will fall if the brake pedals 42, 52 are released when the clutch is OFF.

In addition, in places where half-cracking and pile operations are not possible, for example, in pile driving work, a heavy hammer is hung on one drum 4 with several wires, and a light pile is placed on the other drum 5.
When hanging a book by synchronizing the speed of both, a very delicate sense of operation is required.

Therefore, as in the winch shown in Japanese Patent Application Laid-Open No. 63-101298, the connection and disconnection of the drum and drum shaft are
When hydraulic pressure is applied, the clutch ONS/d1 pressure is released and the clutch is turned OFF by the spring force.The clutch hydraulic cylinder is used to brake and release the drum, and when hydraulic pressure is applied, the clutch ONS/d1 is released and the spring force is used to brake and release the drum. The brake is turned on by a brake hydraulic cylinder and a brake pedal, and the hydraulic motor, clutch hydraulic cylinder, and brake hydraulic cylinder are controlled by a single operating lever, and the brake is activated when the operating lever is in the neutral position. In addition to allowing the user to select between ``automatic brake mode'' and ``free fall mode'' in which the drum can fall freely when the operating lever is in the neutral position, the clutch will be engaged half-way when the operating lever is tilted slightly, and the clutch will be engaged when the tilt is large. There is one that is completely connected.

[Problem to be solved by the invention]

However, even with the winch configured as described above, there is no interlock circuit, so while one drum is hoisting or lowering, there is a risk that the control lever of the other drum may be operated in the opposite direction. Since there is always a half-clutch state in any hoisting or lowering operation in any mode, for example, when lowering in free fall mode J, the suspended load may not be able to be controlled.

Therefore, the present invention provides a winch in which a hydraulic motor, a clutch hydraulic cylinder, and a brake hydraulic cylinder are controlled by a single operating lever, and which allows half-clutch operation only during hoisting operation in "free fall mode". It is an object.

[Means to solve the problem]

In order to achieve the above object, the present invention provides two drums each rotatably supported by a drum shaft driven by a hydraulic motor, a clutch hydraulic cylinder and a brake hydraulic cylinder respectively provided on each drum, and In the winch, the winch includes an operation pilot valve that is provided in a control circuit of a clutch hydraulic cylinder and a brake hydraulic cylinder and also controls the hydraulic motor, and an operation lever that operates the operation pilot valve, respectively. Between the pilot pressure oil circuit of the operating pilot valve,
An interlock circuit is provided to deactivate the hoisting or hoisting operation of the other drum while one drum is hoisting or hoisting, and the brake hydraulic cylinder is switched by pilot pressure oil from the operation pilot valve. A pilot valve for supplying and discharging pressure oil to and from the brake hydraulic cylinder is connected to a circuit from the pilot valve and a bypass circuit from the hydraulic pressure source, and both circuits can be switched to automatic braking mode by operating a switch. A circuit having a select solenoid valve for selecting a drop mode is connected, and a pressure oil supply/discharge circuit branched from a circuit between the pilot valve and the select solenoid valve is connected to the clutch hydraulic cylinder. At the same time, a solenoid valve is provided in the pressure oil supply and discharge circuit, and a pilot pressure oil circuit of the operating pilot valve and a branch circuit branched from the pressure oil supply and discharge circuit are connected to the solenoid valve via a shuttle valve. ,
The branch circuit is provided with a pilot valve that switches between the branch circuit and the pilot pressure oil circuit when the pilot pressure oil of the operation pilot valve exceeds the operating set pressure, and further, the control lever is set to hoist when in a free fall mode. The present invention is characterized in that when operated, the solenoid valve is switched to connect the shuttle valve side circuit to the clutch hydraulic cylinder.

(Function) With this configuration, the hydraulic motor and one drum can be operated with one operating lever, and if one drum is being hoisted or hoisted while the other drum is operated in the opposite direction, The other drum is stopped, and switching between automatic brake mode J and free fall mode J can be performed by operating a switch.Furthermore, when hoisting in free fall mode, the shuttle push circuit is activated. Since it is connected to the clutch hydraulic cylinder, the clutch hydraulic cylinder is first supplied with low pressure oil from the pilot pressure oil circuit of the operating pilot valve, and the drum and drum shaft are connected in a half-clutch state.

When the pressure of the pressure oil in the pilot pressure oil circuit exceeds the operation setting pressure of the pilot valve, the pilot valve is switched and high pressure oil in the branch circuit is supplied to the clutch hydraulic cylinder, and the clutch is fully connected. Become.

〔Example〕

Hereinafter, each embodiment of the present invention will be described based on the drawings.

1 and 2 show a first embodiment, in which a winch 100 has drums 200 and 300 rotatably installed on a drum shaft 101, and the drum shaft 101 is connected to a hydraulic It is driven by a motor 103, and a driving circuit A is connected to the hydraulic motor 103.

Further, the drum 200 is provided with a clutch hydraulic cylinder 201 that connects and disconnects the drum shaft 101 and the drum 200, a brake hydraulic cylinder 202 that brakes and releases the drum 200, and a brake pedal 203. At the same time, a hydraulic circuit B that controls the clutch hydraulic cylinder 201 and the brake hydraulic cylinder 202 is connected.

Furthermore, the drum shaft 101 also applies to the drum 300.
A clutch hydraulic cylinder 301 that connects and disconnects the drum 300, a brake hydraulic cylinder 302 that brakes and releases the drum 300, and a brake pedal 303 are provided.
A hydraulic circuit C that controls the brake hydraulic cylinder 302 and the brake hydraulic cylinder 302 is connected to the hydraulic circuit C.

The driving circuit A of the hydraulic motor 103 is the first speed circuit 1
04 and a second speed circuit 105, both circuits 104,1
05 is provided with a hydraulic pump 106 and a directional switching valve 107, respectively.

The directional control valve 107 is connected to both hoisting circuits 108 and to the lowering circuits 109, and to the operating lever 20 of the hydraulic circuit B.
4 and the direction of the pressure oil supplied from the hydraulic pump 106 to the hydraulic motor 103 by the pilot pressure oil generated in the operation pilot valves 205 and 305 by tilting the operating lever 304 of the hydraulic circuit C, and the hydraulic motor 103 is set to the hoisting side. Or rotate it to the lowering side.

Next, a hydraulic circuit B that controls the clutch hydraulic cylinder 201 and the brake hydraulic cylinder 202, and the clutch hydraulic cylinder 301 and the brake hydraulic cylinder 302
The hydraulic circuit C that controls this will be explained.

Since both circuits B and C have similar configurations, the same components will be explained using related symbols.

The clutch hydraulic cylinders 201 and 301 are connected to the drum shaft 1.
01, and when hydraulic pressure is applied, it expands and presses the clutch linings 206, 306 against the drums 200, 300, connects the drum shaft 101 and drums 200, 300, rotates the drums 200, 300, and releases the hydraulic pressure. The clutch linings 206 and 306 are contracted by the spring force of the springs 207 and 307, and the clutch linings 206 and 306 are separated from the drums 200 and 300, thereby separating the drums 200 and 300 from the drum shaft 101.

The brake hydraulic cylinders 202 and 302 are equipped with springs 208
, 308, the brake lining 2
09.309 is pressed against the drum 200, 300 to brake the drum 200.300, and when hydraulic pressure is applied, it expands and the brake lining 209.309 is pressed against the drum 200, 3.
Release the brake by moving away from 00.

In addition, in the neutral state of "free fall mode", the brake linings 209, 309 are connected to the brake pedals 203, 30.
3, the drums 200 and 300 are pressed against the drums 200 and 300, and the brake pedal 2 is pressed against the drums 200 and 300.
By releasing 03.303, the brake is released from the drums 200, 300.

Furthermore, control circuits 210 and 310 for supplying and discharging pressure oil are connected to the brake hydraulic cylinders 202 and 302 and the hydraulic pump 110 that serves as a hydraulic pressure source. Control circuit 210.31 for these brake hydraulic cylinders 202, 302
0 includes pilot valves 211 and 311, selection solenoid valves 212 and 312, and one-way throttle valves 213 and 3.
13 are provided.

The pilot valves 211, 311 are connected to the hydraulic pump 110 side with a supply circuit 214.314 from the hydraulic pump 110 and a discharge circuit 215.315 to the oil tank 111, and to the brake hydraulic cylinder 202.302 side. , circuit 216 to select solenoid valve 212, 312,
316 are connected, and normally the circuits 216, 316
and the discharge circuits 215, 315 to the oil tank 111, and the operating pilot circuits 217a, 317a branch from the hoisting side operating pilot pressure oil circuits 217, 317 of the operating pilot valves 205, 305, and the lowering side operating pilots. The supply circuit 214 314 from the hydraulic pump 110 and the selection solenoid valve 21 are switched by the pressure oil acting from the pressure oil circuits 218 and 31-8 respectively.
2.312 to the circuits 216, 316.

The selection solenoid valves 212, 312 have a circuit 216, 316 from the pilot valve 211° 311 and a bypass circuit 219, 3 branched from the supply circuit 214, 314 from the hydraulic pump 110 on the hydraulic pump 110 side.
19 is connected to the brake hydraulic cylinders 202 and 3.
On the 02 side, a circuit 220 to the one-way throttle valve 213, 313
．． 320 is connected.

The selection solenoid valves 212, 312 are in an "auto brake mode" which communicates the circuits 220, 320 with the circuits 216, 316 from the pilot valves 211, 311, and the circuits 220, 320 with the bypass circuit 21.
9, 319, and switches between the "free fall mode" which communicates with the brake pedal 2.
03,303 Depress brake pedal switch 203
a.

Turn on 303a, and then turn on mode selection switch 2.
21. Turn on 321 to activate "free fall mode"
Switch to .

The one-way throttle valves 213, 313 include check valves 213a, 313a that allow oil to flow only from the brake hydraulic cylinder 202, 302 in the direction of the hydraulic pump 110, and throttles 213b, 313b provided in parallel therewith. ing.

Further, a discharge circuit 222.322 to the oil tank 111 is connected between the one-way throttle valve 213.313 and the brake hydraulic cylinders 202, 302, and the discharge circuit 222.3 is connected to the oil tank 111.
22 is provided with a solenoid valve 223.323.

The hoisting side pilot pressure oil circuits 217, 317 of the operation pilot valves 205, 305 are provided with pressure switches 224, 324 and solenoid valves 225, 325, and the hoisting side pilot pressure oil circuits 218, 318 are provided with pressure Switch 226.326 and solenoid valve 2
27 and 327 are provided to constitute an interlock circuit.

For example, the above-mentioned interlock circuit is designed to stop the drum 300 operated after the drum 300 from operating when the other drum 300 is being hoisted while the drum 200 is being hoisted. 224
When the solenoid valve 327 is activated, the lowering side pilot pressure oil circuit 31 of the operation pilot valve 305 is switched.
No pilot pressure oil is generated at 8, pressure switch 2
26 is activated, the solenoid valve 325 is switched,
Pilot pressure oil is not generated in the hoisting side pilot pressure oil circuit 317 of the operation pilot valve 305.

Further, when the pressure switch 324 is activated, the solenoid valve 227 is switched, and no pilot pressure oil is generated in the lowering side pilot pressure oil circuit 218 of the operating pilot valve 205, and when the pressure switch 326 is activated, the solenoid valve 225 is switched. Then, operate the pilot valve 20.
Pilot pressure oil is not generated in the hoisting side pilot pressure oil circuit 217 of No. 5.

Furthermore, pressure switches 224, 226° 324.
326 is the pilot pressure oil circuit 217゜218.317
, 318, respectively, and the discharge circuits 222, 3 of the brake control circuit 210, 310
The solenoid valves 223 and 323 provided in the oil tank 22 are switched respectively to block the discharge to the oil tank 111.

On the other hand, the control circuits 228 and 328 of the clutch hydraulic cylinders 201 and 301 are provided with solenoid valves 229 and 329.
A supply circuit 230.330 branched from a circuit 216.316 between 12.312 and a circuit 232.332 from shuttle valves 231, 331 is connected.

The solenoid valve 229,329 is normally connected to the supply circuit 2.
Pressure oil from 30 and 330 is supplied to the clutch hydraulic cylinder 20.
1.301, select solenoid valve 212,
312 to "free fall mode" and press the operating lever 20.
4. When 304 is operated to the winding side, it switches in conjunction with this, and the circuit 23 passing through the shuttle valves 231 and 331
2. Transfer the pressure oil from 332 to the clutch hydraulic cylinder 201
Supply to ゜301.

Further, in the shuttle valves 231, 331, the hoisting side pilot pressure oil circuits 217, 317 of the operating pilot valves 205, 305 are connected to the low pressure side, and the supply circuit 2 is connected to the high pressure side.
Branch circuits 233 and 333 branched from 30 and 330 are connected via pilot valves 234 and 334, respectively.

The pilot valves 234, 334 are operated by pilot circuits 217b, 317b branched from the hoisting side pilot pressure oil circuits 217, 317, and are operated while the pressure oil in the hoisting side pilot pressure oil circuits 217, 317 is below the operating set pressure. does not operate, and the hoisting side pilot pressure oil circuit 21
7. When the pressure oil of 317 exceeds the operating set pressure, the pressure oil from the branch circuit 233, 333 is switched to the shuttle valve 231,
Clutch hydraulic cylinder 201.301 through 331
supply to.

Further, between the shuttle valves 231, 331 and the clutch hydraulic cylinders 201, 301, there are chain valves 235'a, 335a that allow oil to flow only in the direction of the clutch hydraulic cylinders 201, 301. One-way throttle valve 23 equipped with throttles 235b and 335b provided in parallel with
5.335 is provided.

Next, the operation of the winch 100 configured as described above will be explained.

First, select solenoid valves 212 and 312 are connected to circuit 2.
20, 320 and the circuits 216, 316 in the "automatic brake mode" with the operating levers 204, 3 in communication with each other.
04, pilot pressure oil does not act on the directional switching valve 107, so the directional switching valve 107 is also in a neutral state, and no pressure oil is supplied from the hydraulic pump 106, so the hydraulic motor 103 does not rotate.

In addition, in the brake control circuit 210.310, since pilot pressure oil does not act on the pilot valves 211, 311, the circuit 216.3-16 and the discharge circuit 215, 3
15 is in communication with brake hydraulic cylinders 202, 3.
No hydraulic pressure is applied to the brake hydraulic cylinder 202.
．． 302 is compressed by the spring force of springs 208, 308 to move the brake lining 209, 309 onto the drum 200.
300 to form a brake control circuit.

Furthermore, in the clutch control circuits 228, 328, the pilot valves 211, 311 communicate the circuits 230, 330 with the exhaust circuits 215, 315, so no oil pressure acts on the clutch hydraulic cylinders 201, 301, and the clutch The hydraulic cylinders 201 and 301 are contracted by the spring force of the springs 207 and 307, and the clutch linings 206 and 30 are compressed.
6 is separated from the drums 200 and 300, and the clutch is turned off.

Next, when the operating lever 204 on the drum 200 side is tilted toward the hoisting side, pilot pressure oil is generated on the hoisting side of the operating pilot valve 205, and this acts on the direction switching valve 107 from the hoisting side pilot circuit 217. Directional switching valve 1
07 is switched to the winding side, and the hydraulic motor 103 rotates in the winding direction.

At this time, the pressure switch 224 of the hoisting side pilot circuit 217 is activated, closing the solenoid valve 327 provided in the hoisting side pilot circuit 318 on the drum 300 side, and also closing the discharge circuit 2 of the brake control circuit 210.
22 is closed to block the flow of pressure oil to the oil tank 111.

As a result, even if the operating lever 304 on the drum 300 side is operated from behind the operating lever 204 to the lowering side, pilot pressure oil is not generated in the lowering side pilot circuit 318, and the drum 300 is brought to a stopped state.

Furthermore, when the control lever 304 on the drum 300 side is tilted toward the hoisting side, pilot pressure oil is generated on the hoisting side of the operating pilot valve 305, and this acts on the direction switching valve 107 from the hoisting side pilot circuit 317, in the same way as above. , the directional control valve 107 switches to the winding side, and the hydraulic motor 10
3 rotates in the hoisting direction, and the pressure switch 324 of the hoisting side pilot circuit 317 is activated to close the solenoid valve 227 provided in the hoisting side pilot circuit 218 on the drum 200 side, and the brake control circuit 310 is closed. The solenoid valve 323 provided in the discharge circuit 322 is closed to block the flow of pressure oil to the oil tank 111.

As a result, even if the operation lever 204 on the drum 200 side is operated from behind the operation lever 304 to the lowering side, pilot pressure oil is not generated in the lowering side pilot circuit 218, and the drum 200 is brought to a stopped state.

In the brake control circuits 210, 310, the pilot pressure oil of the hoisting side pilot circuits 217, 317 acts on the pilot valves 211, 311 via the operation pilot circuits 217a, 317a,
311 and supply circuit 21 from hydraulic pump 110.
4.314 and the circuits 216, 316 are connected to supply pressure oil to the brake hydraulic cylinders 202, 302, the brake hydraulic cylinders 202, 302 are extended, the brake lining 22 is separated from the drums 200, 300, and the brake・Turns off.

At the same time, the clutch control circuits 228, 328
Since the solenoid valves 229 and 329 do not operate, pressure oil from the supply circuits 230 and 330 is supplied to the clutch hydraulic cylinders 201 and 301, and the clutch hydraulic cylinder 2
01.301 expands and clutch lining 206.3
When 06 is pressed against the drum 200, 300, the clutch is turned on.

In addition, the timing of the brake OFF and clutch ON is determined by the check valve 235a r 335 of the one-way throttle valve 235, 335 in the clutch control circuits 228, 328.
Pressure oil passes through a, and in the brake control circuit 210.310, the throttles 213b and 313 of the one-way throttle valve 213.313
Since pressure oil passes through b, the brake is released after the clutch is engaged.

Next, when the operating lever 204, 304 is tilted toward the lowering side, pilot pressure oil is generated on the lowering side of the operating pilot valves 205, 305, and this is transferred from the lowering side pilot circuit 218, 318 to the directional control valve. 107, the directional control valve 107 switches to the lowering side, and the hydraulic motor 103
rotates in the lowering direction.

In addition, the pressure switches 226 and 326 provided in the lowering side pilot circuits 218 and 318 are activated to close the solenoid valves 325 and 225 to prevent the hoisting operation from behind the other drum, and the brake control circuit 210 , 310, the solenoid valves 223 and 323 provided in the discharge circuits 222 and 322 of the oil tank 1 are closed.
Block the flow of pressure oil to 11.

At this time, in the brake control circuits 210, 310, the pilot pressure oil of the lowering side pilot circuits 218, 318 acts on the pilot valves 211, 311,
1,311, the supply circuits 214, 314 from the hydraulic pump 110 and the circuits 216, 316 are connected to supply pressure oil to the brake hydraulic cylinders 202, 302, and the brakes are turned off and turned off in the same manner as on the hoisting side described above. Become.

At the same time, the clutch control circuits 228, 328
Pressure oil from the supply circuits 230, 330 is supplied to the clutch hydraulic cylinder 5, and the clutch is turned on.

The timing of turning off the brake and turning on the clutch at this time is similar to the above-mentioned winding side, after the clutch is connected, the brake is released.

In addition, the operation lever 204 can be
, 304 to neutral, the operating pilot valves 205, 3
Since the pilot pressure oil of 05 runs out, the directional control valve 10
7 becomes neutral, the hydraulic motor 103 stops, and at the same time, the pilot valve 211, 311 and the brake control circuit 2
Since the solenoid valves 223 and 323 provided in the discharge circuits 222 and 322 of 10 and 310 are switched, the pressure oil that was acting on the brake hydraulic cylinders 202 and 302 is discharged to the oil tank 111, and the clutch hydraulic cylinder 201 ．．
The pressure oil that was acting on 301 is the one-way throttle valve 235, 33
5 through the apertures 235b and 335b, so the drum 2
The drum shaft 101 and the drums 200, 300 are separated while the drums 00, 300 are braked first.

Next, the "free fall mode" will be explained.

As shown in FIG. 2, the brake pedal 203.30
3, press the brake pedal switch 203a, 303
a to ONL, mode selection switch 221.321 to O
When N is selected, the select solenoid valves 212 and 312 are switched, and even if the operating lever 204 and 304 are in the neutral state, in the brake control circuit 210 and 310, the bypass circuits 219 and 319 and the circuits 220 and 320 are communicated with each other. , the pressure oil from the hydraulic pump 110 is supplied to the brake hydraulic cylinders 202 and 302, and the brake hydraulic cylinders 202 and 302 are extended and the brake lining 209 is extended.
．． 309 separates from the drum 200.300, and the drum 20
0,300 is released, and the drums 200, 300 are in a free rotation state. If you want to brake in this case, you can press the brake pedal 203.303 to press the brake lining 209.309 against the drum 200.300.

When the operating levers 204, 304 are tilted toward the hoisting side from this state, the brake control circuits 210, 310 maintain the brake low FF state, and the pilot pressure oil of the hoisting side pilot circuits 217, 317 is turned to the directional control valve. 1
07, the direction switching valve 107 is switched to the winding side, and the hydraulic motor 103 is rotated in the winding direction.

At the same time, in the clutch control circuit 228.328,
The pressure switches 224, 324 of the hoisting side pilot circuit 217.317 operate, and the solenoid valve 229.
329, first, the winding side pilot circuit 217
, 317 pilot pressure oil is supplied to the shuttle valves 231, 331.
is supplied to the clutch hydraulic cylinders 201, 301 via the clutch hydraulic cylinders 201, 301, which extend to transfer the clutch linings 206, 306 to the drums 200.
When pressed to 300, the clutch is turned on.

Further, when the pilot pressure oil becomes equal to or higher than the operation setting pressure of the pilot valves 234, 334, the pilot pressure oil is transferred from the pilot circuits 217b, 317b to the pilot valves 234, 334.
34, the pilot valves 234 and 334 are switched, and the pressure oil from the branch circuit 233 and 333 is transferred to the shuttle valve 23.
Clutch hydraulic cylinder 201, 3 via 1,331
01 and the clutch is turned on.

In the above two types of clutch connections, when the pilot pressure oil of the hoisting side pilot circuits 217, 317 is used, the pilot pressure oil becomes a half-clutch connection when the pressure is low.
When the pilot pressure oil exceeds the operation setting pressure of the pilot valves 234, 334 and the pilot valves 234, 334 are switched, high pressure oil is supplied from the branch circuits 233, 333 and the clutch is fully connected. Become.

Next, when the operating levers 204, 304 are placed in the lowering side, the brake control circuits 210, 310
While maintaining the FF state, lowering side pilot circuit 2
The pilot pressure oil 18,318 acts on the direction switching valve 107, the direction switching valve 107 is switched to the lowering side, and the hydraulic motor 103 rotates in the lowering direction.

At this time, in the clutch control circuits 228, 328, the pressure oil in the lowering side pilot circuits 218, 318 switches the pilot valves 211, 311, and the pressure oil from the hydraulic motor 110 passes from the circuits 214, 314 through the circuits 230, 330. and supplied to the clutch hydraulic cylinders 201, 301,
The clutch turns ON.

Furthermore, when the operating levers 204 and 304 are returned to neutral, the brake and clutch are turned off and the hydraulic motor 103 is also stopped.

Note that, similarly to the above-mentioned "auto brake mode", when the pressure switch 224 is activated, the solenoid valve 327 is activated, and when the pressure switch 324 is activated, the solenoid valve 22 is activated.
7, when the pressure switch 226 is activated, the solenoid valve 325 is closed, and when the pressure switch 326 is activated, the solenoid valve 225 is closed, and the pressure oil of the brake hydraulic cylinder 202, 302 of the drum 200 or drum 300 to be operated later is supplied with oil. Discharge the brake linings 209, 309 to the tank 111 and transfer them to the drum 200,
300 to make the drum 200°300 stop and become deaf.

With the above configuration, the hydraulic motor 103 and the drum 200 can be controlled by the operating lever 204, and the hydraulic motor 103 and the drum 300 can be controlled by the operating lever 304, improving operability. Also, if one drum 200 or drum 300 operates the other drum 300 or drum 200 in the opposite direction while the other drum 200 or drum 300 is in the winding or lowering operation,
The other drum is in a stopped state and is safe.

In addition, "autobrake mode" and "free fall mode"
can be switched by depressing the brake pedals 203, 303 and operating the switches 221, 321. Also, when hoisting in "free fall mode", the shuttle valve 231.3
Since the circuit 232 332 on the 31 side is connected to the clutch hydraulic cylinders 201 and 301, the clutch hydraulic cylinders 201 and 301 are first connected to the operation pilot valve 205.
Low pressure oil is supplied through the pilot pressure oil circuits 217 and 317 at 305°, and the drums 200 and 200 are in a half-clutch state.
300 and the drum shaft 101 are connected.

When the pressure of the pressure oil in the pilot pressure oil circuits 217, 317 exceeds the operation setting pressure of the pilot valves 234, 334, the pilot valves 234, 334 are activated and the high pressure oil passing through the pilot valves 234, 334 is activated. The oil is supplied to the clutch hydraulic cylinders 201 and 301, and the clutch becomes fully connected.

In the above explanation, both drums 200 and 300 are in "auto brake mode" and "free fall mode", but one drum is in "auto brake mode" and the other drum is in "free fall mode". It is also possible to set it as "mode".

FIG. 3 shows a second embodiment of the present invention in which pilot valves 250, 251, 350, and 351 are provided in place of the solenoid valves 225, 227, 325, and 327 in the interlock circuit of the first embodiment. FIG. 4 also shows the discharge circuit 222 to the oil tank 111 in both of the above embodiments.
322 and a third embodiment in which the solenoid valves 223, 323 provided in the discharge circuits 222, 322 are omitted,
If the piping length between the brake hydraulic cylinders 202, 302 and the pilot valves 211, 311 is long, the first. Solenoid valves 223, 323 configured as in the second embodiment
The pressure oil in the brake hydraulic cylinders 202, 302 is quickly discharged, the drums 200, 300 are braked early, and the clutch and brake timings are synchronized. directional throttle valve 213,
It is possible to synchronize the timing of the clutch and brake by the throttles 213b and 313b of 313.

〔Effect of the invention〕

As described above, the present invention provides a motor driven by a hydraulic motor.
It has two drums on the main drum shaft, and two eight-operated actuators each equipped with a pilot valve to control the hydraulic motor and the clutch hydraulic cylinder and brake hydraulic cylinder provided on each drum. In a lever-operated winch, an interlock circuit is provided between the pilot pressure oil circuits of each operating pilot valve to disable the lowering or hoisting operation of the other drum while one drum is in the hoisting or lowering operation, The brake hydraulic cylinder includes:
A pilot valve that is switched by the pilot pressure oil of the operation pilot valve to supply and discharge pressure oil to the brake hydraulic cylinder, a circuit from the pilot valve and a bypass circuit from the hydraulic source are connected, and the switch is operated. A circuit having a select solenoid valve that switches both circuits to select between an automatic brake mode and a free fall mode is connected to the clutch hydraulic cylinder, and a circuit between the pilot valve and the select solenoid valve is connected to the clutch hydraulic cylinder. A pressure oil supply and discharge circuit branched from the pressure oil supply and discharge circuit is connected, and a solenoid valve is provided in the pressure oil supply and discharge circuit, and a pilot pressure oil circuit of the operation pilot valve and a pressure oil supply and discharge circuit branched from the pressure oil supply and discharge circuit are connected to the solenoid valve. A branch circuit is connected to the pilot pressure oil circuit via a shuttle valve, and the branch circuit is provided with a pilot valve that switches between the branch circuit and the pilot pressure oil circuit when the pilot pressure oil of the operating pilot valve exceeds the operating setting pressure, and further , the solenoid valve is switched to connect the shuttle valve copper circuit to the clutch hydraulic cylinder when the operating lever is operated to the winding side in the free fall mode, so that the hydraulic pressure can be controlled with one operating lever. It can operate the motor and one drum, and when one drum operates the other drum in the opposite direction during the hoisting or lowering operation, the other drum will be in a stopped state, and in addition, it has an "auto brake mode".
You can switch between "free fall mode" and "free fall mode" by operating a switch.

Furthermore, during hoisting operation in "free fall mode", the shuttle valve opening circuit is connected to the clutch hydraulic cylinder, so the clutch hydraulic cylinder is first connected to the pilot pressure hydraulic circuit of the operating pilot valve. When low-pressure oil is supplied through the established circuit, the drum and drum shaft are connected in a half-clutch state, and the pressure of the pressure oil in the pilot pressure oil circuit exceeds the operating set pressure of the pilot valve, the pilot valve is activated. is switched, high-pressure oil passing through the pilot valve is supplied to the clutch hydraulic cylinder, and the clutch becomes fully connected.

Therefore, in "free-fall mode" hoisting operation, the clutch of one drum can be fully engaged and the other drum can be half-engaged, and the rotational speed of both drums can be adjusted according to the load, and the winch This makes driving operations easier.

[Brief explanation of the drawing]

1 and 2 show a first embodiment of the present invention,
Fig. 1 is a hydraulic system diagram, Fig. 2 is a relay circuit diagram, Fig. 3 is a hydraulic system diagram showing a second embodiment of the present invention, Fig. 4 is a hydraulic system reading diagram showing a third embodiment of the present invention, FIG. 5 is a hydraulic system diagram showing a conventional example. 100...Winch 101...Drum shaft 1
03... Hydraulic motor A... Drive circuit for hydraulic motor 103 200, 300... Drum 201
゜301...Clutch hydraulic cylinder 202,3
02... Brake hydraulic cylinder B... Hydraulic circuit of clutch hydraulic cylinder 201 and brake hydraulic cylinder 202 of drum 200 C... Drum 300
Hydraulic circuit of clutch hydraulic cylinder 301 and brake hydraulic cylinder 302 204° 304... Operating lever 205, 305... Operating pilot valve 2
10,310...Control circuit for brake hydraulic cylinder 211,311...Pilot valve 212,3
12...Select solenoid valve 217,317
...Hoisting side operation pilot circuit 218, 318
... Lowering side operation pilot circuit 221, 321
...Mode selection switch D...Interlock circuit 228,328...Clutch hydraulic cylinder control circuit 229.329...Solenoid valve
231.331...Shuttle valve series 2 prisoners

Claims (1)

[Claims] 1. Two drums each rotatably supported by a drum shaft driven by a hydraulic motor, a clutch hydraulic cylinder and a brake hydraulic cylinder provided on each drum, and each clutch hydraulic cylinder and brake hydraulic cylinder. In a winch that includes operating pilot valves that are provided in the control circuits of hydraulic cylinders and also controls the hydraulic motor, and operating levers that operate the operating pilot valves, the pilot pressure oil of each of the operating pilot valves is An interlock circuit is provided between the circuits to deactivate the hoisting or hoisting operation of the other drum while one drum is hoisting or hoisting, and the brake hydraulic cylinder is connected to the pilot pressure of the operating pilot valve. A pilot valve that is switched by oil to supply and discharge pressure oil to and from the brake hydraulic cylinder is connected to a circuit from the pilot valve and a bypass circuit from the hydraulic power source, and both circuits can be switched automatically by operating a switch. A circuit having a selection solenoid valve that selects between the brake mode and the free fall mode is connected, and the clutch hydraulic cylinder is connected to a pressure oil supply and discharge circuit branched from the circuit between the pilot valve and the selection solenoid valve. In addition to connecting the circuit, a solenoid valve is provided in the pressure oil supply and drainage circuit, and a shuttle valve is connected to the solenoid valve to connect the pilot pressure oil circuit of the operation pilot valve and a branch circuit branched from the pressure oil supply and drainage circuit. a pilot valve that switches between the branch circuit and the pilot pressure oil circuit when the pilot pressure oil of the operating pilot valve exceeds the operation setting pressure, and further includes a pilot valve that switches between the branch circuit and the pilot pressure oil circuit in a free fall mode and A winch characterized in that the solenoid valve is switched to connect the shuttle valve side circuit to a clutch hydraulic cylinder when the operating lever is operated to the winding side.