JPS58183592A - Controller for hydraulic driving winch - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for a hydraulically driven winch in a hydraulic crane.

Conventionally, hydraulic crane winches that use a main hoist drum and an auxiliary hoist drum are known, but conventionally, two motors are used: a main hoist drive motor and an auxiliary hoist drive motor. Ta. In addition, the main winding clutch device and the auxiliary winding clutch device, which are provided to individually transmit the driving force of each motor to each drum, are controlled on and off by lever operation, and the idling of each drum is individually controlled. The main winding brake device and the auxiliary winding brake device provided for braking are controlled on and off by respective brake pedals provided separately from the clutch devices.

Conventionally, two drive motors, one for the main winding and one for the auxiliary winding, are used, which results in a complicated circuit configuration and increased costs.In addition, it is difficult to control the drive, stop, and free fall of each drum. At times, it is necessary to operate both the clutch operating lever and the brake pedal at all times, resulting in a problem of poor operability.

In view of these circumstances, the present invention aims to reduce costs by simplifying the structure, and has developed a hydraulic system that can easily and accurately control the drive, stop, and free fall of the main winding and auxiliary winding. A drive winch control device is provided.

That is, the feature of the present invention is that one drive motor can drive both the main winding drum and the auxiliary winding drum,
In addition, in each control system of the main winding and auxiliary winding, both the clutch device and the brake device are controlled on and off by operating the lever of each work switching valve, and the main winding and auxiliary winding are driven, stopped, and freed. The fall can be easily controlled, and the drive source of the motor;
It is possible to accurately control on/off of each clutch and brake separately from the pressure oil source for controlling each clutch device and brake device, and another feature is that: With each work switching valve switched to the drum drive position, the brake will not turn off unless the driving pressure of the motor reaches a predetermined pressure or higher, so that the main winding and auxiliary winding can be driven and stopped smoothly and safely. The point is that it enhances the sexiness.

Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

Pl is a first pump as a first pressure oil source, and its discharge circuit 10 is connected to both side circuits 14 and 15 of a winch drum drive motor M and a discharge circuit 16 to a tank T via a first control valve v1. Connected in a switchable manner. The first control valve 1 includes a first relief valve 11, a pilot valve 12 for merging surplus oil from other actuator circuits such as a poom elevating circuit of a hydraulic crane, and a rotation direction of the motor M, that is, a winding 5-1. It is equipped with a winding direction switching valve 15 for switching the direction. The winding direction switching valve 13 can be freely switched between a neutral position 13a where the motor M is stopped, a position 131) where the motor M is rotated in the winding direction, and a position 130 where the motor M is rotated in the winding down direction. Nodame operating lever 13 (l) and nodame automatic return spring 15e that holds it in neutral position 13a.

It is equipped with 15f. 17 is a counterbalance valve, 1
8.19 shows the pilot circuit.

P2 is a second pump serving as a second pressure oil source, and a second control valve v2 is connected to its discharge circuit 20.

Note that the second pump P2 is a pressure oil source for controlling the clutch and brake, as will be described later, and is therefore smaller (lower capacity, lower discharge pressure) than the first pump P1 that drives the motor M. It's fine to use one.

The second control valve v2 includes a check valve 21, a second relief valve 22, a main winding work switching valve 25, and an auxiliary winding work switching valve 2.
3', and a pilot switching valve 24. The main winding work switching valve 23 and the auxiliary winding work switching valve 23' are connected to the discharge circuit 2.
The main winding work switching valve 23 includes a main winding clutch device 6 which transmits the driving force of the motor M to the main winding drum 50.
0 clutch circuit 61 and the brake circuit 41 of the main winding negative brake device 40 that brakes the idle rotation of the main winding drum 50 are connected, and the driving force of the motor M is connected to the auxiliary winding work switching valve 26'. The clutch circuit 61' of the auxiliary winding clutch device 60' transmits the auxiliary winding drum 50' to the auxiliary winding drum 50', and the brake circuit 41' of the auxiliary winding negative brake device 40' that brakes the idling of the auxiliary winding drum 50'. It is connected.

In addition, each work switching valve 23, 23' guides the hydraulic oil in the clutch device 30, 30' and the hydraulic oil in the negative brake device 40, 40' to the tank T, and turns off the clutch and turns on the brake, and switches the drum 50. Neutral positions 23a, 23'a for stopping the drum and each clutch device to stop the .50'! 10.30' and each negative brake device 4
Drum drive position 231 where the pressure oil from the second pump P2 is introduced at 0.40' to turn on the clutch and turn off the brake to transmit the driving force of the motor M to each drum 50.50'.
), 23'b and the hydraulic oil in each clutch device 30, 50' is led to the tank T to turn off the clutch, and pressure oil from the second pump P2 is led to each negative brake device 40, 40' to turn on the brake. Each drum can be freely switched to a free fall position 23C+23'c which enables a free fall of 50°; 50'.
Spring 25 eI 23'e for automatically returning from 3'Q to neutral position 23a, 23'a, and neutral position 23a
121'a and drum drive position 26b.

Positioning means 23f for holding its position at 23'b.

26'f.

Further, the pilot switching valve 24 is connected to the driving pressure knob of the motor M from the circuit 14.15 on both sides to the pilot circuit 18s1.
When the pressure difference is small, it is held at the neutral position 24a by springs 24d and 24θ, and when the pressure difference exceeds a predetermined value, it is switched to the right position 241) or the left position. Switched to 24C. However, the spool hole shapes at the left and right switching positions 24bl and 24c are the same. 26 is an auxiliary circuit, and 27 is an accumulator.

60 is a positive brake device for the main winding, 60' is a positive brake device for the auxiliary winding, and each of the clutch circuits 31.
31' and each negative brake circuit 41, 41' are constituted by an independent hydraulic circuit, and each brake pedal 61, 61' depression force is transferred to a mask cylinder 62, 62'.
' The signal is transmitted to the brake cylinder via '. 63. 63' is the pressure oil source for positive brake, 64
indicates a supply tank. This pressure oil source 65,65' may be led from the drain circuit, in which case the supply tank 64 can be omitted.

Next, the effect will be explained.

First, when no operation is performed, the winding direction switching valve 16 is held in the neutral position by the springs 13e1 and 13f, and the oil discharged from the first pump P1 is guided in the direction of the arrow A1 and returned to the direction of the arrow T. , motor M is stopped. At this time, since no pressure is introduced into the pilot circuits 18, 19, the pilot switching valve 24 is held at the neutral position 24a. On the other hand, each work switching valve 23, 23' for the main winding and the auxiliary winding also has a spring 26θ.

They are held at neutral positions 23a and 23'a by 23'θ and positioning means 23f and 23+f. For this reason, the hydraulic fluid in each clutch device 30.30' and the hydraulic fluid in each negative brake device 40.40' are transferred to arrow A2. A1
2 directions and A5. A' is guided in the three directions and returned to the tank T via each work switching valve 25, 25' and pilot switching valve 24, so that each clutch device 50, 50' is in a clutch-off state, and each The negative brake device 40, 40' is brought into a brake-on state by its own spring force, and each drum 50, 50' is held in a stopped state without idling, so that the hanging tool and the suspended load do not fall.

Note that when each drum 50, 50' is stopped, the oil discharged from the second pump P2 is guided in the direction of arrow A4, passes through the pilot switching valve 24 and the auxiliary circuit 26, and then flows into the accumulator 2.
After a predetermined pressure is accumulated in the accumulator 27, the discharged oil is returned to the tank T via the second relief valve 22.

Next, when winding the main winding, the main winding work switching valve 23 is switched to the drum drive position 25'b by its operating lever 23d, and then the winding direction switching valve 13 is switched to the winding position by its operating lever 13 (i). Switch to position 13b.

Accordingly, first, the oil discharged from the second pipe P2 is
direction, flows into the main winding clutch device 30, and is immediately clutched on. Thereafter, the oil discharged from the first pump P1 is guided in the direction of arrow B2, flows into the motor M, and attempts to drive the motor M. However, since the pressure on the inflow side of the motor M is initially low, the pilot switching valve 24 is in the neutral position 24a, and therefore the hydraulic fluid in the main winding negative brake device 40 is guided in the direction of arrow B3. Returned to the tank T, the brake device 40 is in the brake-on state due to its own spring force, and the main winding drum 50
has stopped.

After that, when the pressure on the inflow side of the motor M becomes equal to or higher than a predetermined pressure, the pressure is guided from the circuit 14 through the pilot circuit 18 in the direction of arrow B4, and the pilot switching valve 24 is switched to the right position 24b. Accordingly, the oil discharged from the second pump P2 is guided in the direction of the arrow B1 and the direction of the arrow B5, flows into the main winding clutch device 30, and while the clutch is engaged, flows into the main winding negative brake device 40. The brake is turned off, the motor M rotates in the winding direction, and the rotational force is transmitted to the power transmission mechanism 51 and the main winding clutch device 3.
0 to the main winding drum 50.
rotates in the winding direction, and the main winding operation is performed.

At this time, the oil discharged from the motor M is guided in the direction of arrow B6 and returned to the tank T.

In such a case, when the pilot switching valve 24 is omitted and the work switching valve 26 is switched to the drum drive position 231), the oil discharged from the second pump P2 is guided to the clutch device 60 and the clutch is turned on, at the same time as the negative brake is activated. device 4o
Even if the brake is turned off by leading to
The function of this function can prevent the hanging equipment and suspended load from falling, but
As described above, when the drive pressure of the motor M reaches a predetermined pressure, pressure oil is introduced to the negative brake device 40 via the pilot switching valve 24 to turn off the brake, thereby giving an impact to the motor M at the start of this hoisting operation. Even if the main hoist winding work can be started smoothly without any physical load, when the main hoist hoisting operation is temporarily stopped, the main hoist work switching valve 26 is held in the winch working position 23b, and the winding direction switching valve 1 is turned off.
3 should be returned to the neutral position 15a. As a result, the supply of pressure oil to the motor M is stopped, the motor M stops, and the pressure on the inflow side becomes low, so the pilot switching valve 24
is returned to the neutral position 24a, and for this reason, pressure oil is continuously introduced to the main winding clutch device 30 and the clutch is turned on, but the hydraulic oil in the main winding negative brake device 40 is in the direction indicated by the arrow B2. As soon as the main winding drum 50 is guided in this direction, the brake is turned on and the main winding drum 50 is stopped.

When lowering the main hoist, the winding direction switching valve 13 may be switched to the lowering position 130 while the work switching valve 26 is held at the winch operating position 25b.

In addition, after the winch work of the main hoist is completed, the hoisting direction switching valve 1
6 to the neutral position 13a, the main winding work switching valve 26
All you have to do is return it to the neutral position 23a.

Next, when performing free fall of the main winding, the winding direction switching valve 16 is returned to the neutral position 13a, and the main winding work switching valve 26 is returned to the neutral position 13a.
By switching to the free fall position 25Q, the oil discharged from the first pump P1 is guided in the direction of the arrow C1 and returned to the tank T, and the motor M is stopped. On the other hand, the oil discharged from the second pump P2 is guided in the direction of arrow C2 and flows into the negative brake device 40 for the main winding, and the brake device 40 is turned off, and the hydraulic oil in the clutch device 30 for the main winding is turned off. It is guided in the direction of arrow C3 and returned to the tank T, and the clutch device 60 is turned off, so that the hanging tool and the hanging load freely descend while causing the main winding drum 50 to idle due to its own weight.

During this free fall, by stepping on the brake pedal 61 of the main winding positive brake device 60 to turn on the brake, the drum 50 can be stopped, and the hanging tool and the suspended load can be stopped at any position.

However, in the present invention, if the lever 23d is operated to return the work switching valve 26 to the neutral position 23a, the hydraulic fluid in the clutch device 50 and the negative brake device 40 can be
The hydraulic oil inside is returned to the tank T, the clutch is automatically turned off and the brake is turned on, and the drum 50 is stopped.
Since the hanging tool and the suspended load are stopped, it is not necessarily necessary to depress the brake pedal 61 of the positive brake device 60, and therefore, the positive brake device 60 may be omitted. In this case, if the work switching valve 23 is suddenly returned to the neutral position 23a, the shock at the time of stopping will be large. Just apply the brakes.

During this free fall, the lever 23d is still switched against the spring 25e, so when the lever 25d is released, the work switching valve 26 is automatically returned to the neutral position 21a by the spring 26θ, and the clutch is automatically turned off and Since the brake is turned on, the lifting equipment and the suspended load will not fall unexpectedly, making it safe. There is no need to lock it in the state, and the locking mechanism can be omitted.

In addition, when controlling the drive, stop, and free fall of the auxiliary winding, the auxiliary winding work switching valve 26' and the winding direction switching valve 16 are used.
It is only necessary to perform the switching operation in the same manner as in the case of the main winding.

As explained above, according to the present invention, it is possible to drive the main winding drum and the auxiliary winding drum with one drive motor, and the main winding and auxiliary winding clutch devices and each Since both brake devices can be controlled on and off,
By simplifying the overall configuration and circuitry, it is possible to significantly reduce costs.

Furthermore, the drive, stop, and free fall of the main winding and auxiliary winding can be easily controlled by lever operation alone, and the drive source for the motor and the pressure oil source for controlling each clutch device and brake device can be easily controlled. Since each clutch and brake can be controlled separately, control stability and safety can be improved.

Further, according to the second invention, the brake is turned on until the driving pressure of the motor reaches a predetermined pressure when the main winding and the auxiliary winding are driven or stopped, and the brake is turned off when the driving pressure exceeds the predetermined pressure. Each drum can be driven and stopped smoothly, further increasing safety.

(second pump), ■1...first control valve, v2...second control valve, M...winch drum drive motor, T...tongu 16...winding direction switching valve, 13a...・Neutral position,
131)...Hoisting position, 130...Hoisting down position,
13d,... Operation lever, 13θ, 16f... Spring, 17... Counter balance valve, 23... Main winding work switching valve, 26'... Auxiliary winding work switching valve, 23a, 2
1'a...Neutral position for drum stop, 231)+231
'tl...Drum drive position, 17-2!1cI23'c...Free fall position, 24.
...Pilot switching valve, 30...Clutch device for main winding, 60'...Clutch device for auxiliary winding, 40...Negative brake device for main winding, 40'...Negative brake device for auxiliary winding, 50... Main winding drum, 50'...
・Drum for auxiliary winding.

Patent applicant: Kobe Steel, Ltd. 18-

Claims (1)

[Claims] 1. A winding direction switching valve that guides pressure oil from a first pressure oil source to a winch drum drive motor, and transmits the driving force of the motor to the main winding drum and the auxiliary winding drum individually. A main winding clutch device and an auxiliary winding clutch device, a main winding negative brake device and an auxiliary winding negative brake device that individually brake the idling of each drum, a main winding clutch device and a main winding negative brake. A main winding work switching valve that selectively connects the device to a second pressure oil source and a tank and controls the clutch device and the brake device on and off to switch the main winding drum between driving, stopping, and free fall. Then, the auxiliary winding clutch device and the auxiliary winding negative brake device are selectively connected to the second pressure oil source and the tank, and the clutch device and the brake device are controlled on and off to drive and stop the auxiliary winding drum. 1- A control device for a hydraulically driven winch, characterized in that: 2. A winding direction switching valve that guides pressure oil from the first pressure oil source to the winch drum drive motor, and a main winding clutch device that individually transmits the driving force of the motor to the main winding drum and the auxiliary winding drum. A clutch device for the auxiliary winding, a negative brake device for the main winding and a negative brake device for the auxiliary winding that individually brake the idling of each drum, and a clutch device for the main winding and a negative brake device for the main winding are connected to a second pressure oil. a main winding work switching valve that selectively connects to the power source and the winding power to control the clutch device and the brake device on and off to switch between driving, stopping, and free fall of the main winding drum, and an auxiliary winding drum. A clutch device for auxiliary winding and a negative brake device for auxiliary winding are selectively connected to a second pressure oil source and a tank, and the clutch device and the brake device are controlled on and off to drive, stop, and free fall the drum for auxiliary winding. It is equipped with an auxiliary winding work switching valve that performs switching and a pilot switching valve that is switched when the drive pressure of the motor exceeds a predetermined pressure, and each of the work switching valves is switched to each drum drive position. At this time, the pressure oil from the second pressure 2-oil source is guided to each clutch device to turn on the clutch, and the hydraulic oil in each negative brake device is guided to the tank, and the motor drive pressure becomes high and the pilot switching valve is activated. 1. A control device for a hydraulic pivot winch, characterized in that, when switched, pressure oil from a second pressure oil source is guided to each negative brake device to turn off the brake.