JPS58183593A - 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.

-ff The hydraulically driven winch is equipped with a clutch device that transmits the driving force of the winch drive motor to the winch drum, and a brake device that brakes the winch drum from idling.As the brake device, a positive brake device is used. Two types of brake systems are known: one that uses a negative brake device, and one that uses a negative brake device.

However, conventionally, the brake device is operated by a brake pedal provided separately from the operating lever of the clutch device. There is a problem in that it is necessary to operate both the clutch operating lever and the brake pedal at all times during each control (descent), resulting in poor operability.

In particular, with positive brake devices, the brakes are applied by the normal brake operation of depressing the brake pedal, so the brake operation itself is easy and has the advantage of being easy to control free fall, but if no operation is done Because the suspended load falls when the brake is off (released), it is necessary to lock the pedal etc. with a locking mechanism while the brake is on, and it is necessary to release the locking mechanism before and after operating the brake. There is a risk of the suspended load falling due to malfunction.

In addition, with a negative brake device, if no operation is performed, the brake is turned on by spring force, so it is possible to completely hold the suspended load, and even if you make a mistake, if you release the brake operation, it will automatically stop However, when controlling free fall, the brake pedal must be lifted to apply the brakes, which is the opposite of a normal brake operation, making it difficult to control.

The invention was made in order to solve the above-mentioned conventional problems, and it is possible to easily turn on the clutch device and the negative brake device using a common work switching valve and operation lever.
When the winch operation is stopped, the hydraulic oil in the clutch device and the hydraulic oil in the negative brake device are released to the tank with the work selector valve in the neutral position to turn off the clutch and turn on the brake to stop the winch drum. , to reliably prevent suspended loads from falling,
During winch work, the first switching valve guides pressure oil from the first pressure oil source to the winch drive motor to drive the motor, and the second switching valve directs the pressure oil from the first pressure oil source to the winch drive motor, which is different from the one used for driving the VJ. Pressure oil from the source is guided to the clutch device to turn on the clutch, and when the driving pressure of the motor is low, hydraulic oil in the negative brake device is guided to the tank by a second switching valve and a pilot switching valve to turn on the brake. , When the motor drive pressure becomes high, the pilot valve is switched to guide the pressure oil from the second pressure oil source to the negative brake device to turn off the brake, so that the winch drum can be driven smoothly, and the winch drum can be driven smoothly. Occasionally, the work switching valve releases the hydraulic oil in the clutch device to the tank to turn off the clutch, and at the same time
To provide a control device for a hydraulically driven winch that can improve operability and safety by guiding pressure oil from a pressure oil source to a negative brake device to smoothly turn off the brake and allowing free fall work to be performed with complete freedom. .

Hereinafter, the tree invention will be explained based on the 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 vl. Connected in a switchable manner. First control valve V1
is a first relief valve 11, a pilot valve 12 for merging excess oil from other actuator circuits such as a poom elevation of a hydraulic crane, and a winding direction switch for switching the rotational direction of the motor M, that is, the winding direction. It is equipped with a valve 13. The winding direction switching valve 13 can be freely switched between a neutral position 13a where the motor M is stopped, a position 13b where the motor M is rotated in the winding direction, and a position 13c where the motor M is rotated in the winding direction. It is provided with an operating lever 13d and automatic return springs 13e and 13f for holding the neutral position 13a. 17 is a counter balance valve, and 18 and 19 are pilot circuits.

P2 is a second pump as a second pressure oil source, and its discharge circuit 20 includes a check valve 21, a second relief valve 22,
A second valve equipped with a work switching valve 23 and a pilot switching valve 24
A clutch circuit 31 of a clutch device 30 that transmits the driving force of the motor M to the winch drum 50 and a brake circuit 41 of a negative brake device 40 that brakes idling of the winch drum 50 are connected via a control valve v2. . As will be described later, the second pump P2 is a pressure oil source for controlling the clutch and brake, so it is smaller (lower capacity, lower discharge pressure) than the first pump P1 for driving the motor M. It's fine to use one.

The work switching valve 23 is at a drum stopping neutral position where the hydraulic oil in the clutch device 30 and the hydraulic oil in the negative brake device 40 are guided to the tank T, and the clutch is turned off and the brake is turned on to stop the winch drum 50. 2
3a, and a drum drive position 23b that guides pressure oil from the second pump P2 to the clutch device 30 and each negative brake device 40 to turn the clutch on and brake off to transmit the driving force of the motor M to the winch drum 50; A free fall position where the hydraulic oil in the clutch device 30 is guided to the tank T to turn on the clutch, and the pressure oil from the second pump P2 is introduced to the negative brake device 40 to turn off the brake, allowing the winch drum 50 to free fall. 23c, and can be freely switched between
3d and from the free fall position 23c to the neutral position 23a
a spring 23e for automatically returning to the neutral position 23a;
and positioning means 23f for holding the position at the drum drive position 23b.

Further, the pilot switching valve 24 is connected to the driving pressure of the motor M, that is, from the both-side circuit 14.15 to the pilot circuit 18.1.
When the pressure difference is small, it is held at the neutral position 24a by springs 24d and 24e, and when the pressure difference exceeds a predetermined value, it is switched to the right position 24b or the left position 24c. can be switched to However, the spool holes at the left and right switching positions 24b and 24c are formed in the same shape. 26 is an auxiliary circuit;
2 't if accumulator is shown.

60 is a positive brake device, which is connected to the clutch circuit 3;
1 and the negative brake circuit 41, and is configured to transmit the depression force of the brake pedal 61 to the brake cylinder via the master cylinder 62. Reference numeral 63 indicates a positive brake pressure oil source. This pressure oil source 63 may be led from the drain circuit.

Next, the effect will be explained.

First, when no operation is performed, the winding direction switching valve 13 is held in the neutral position by the springs 13e and 13f, and the oil discharged from the first pump P1 is guided in the direction of arrow A1 and returned to the tank T, and the motor M has 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,
The work switching valve 23 is also held at a neutral position 23a by a spring 23e and positioning means 23f. Therefore, the hydraulic oil in the clutch device 30 and the negative brake device 4
The hydraulic oil in 0 is guided in the direction of arrows A2 and A3,
It is returned to the tank T via the work switching valve 23 and the pilot switching valve 24, so that the clutch device 30 is in a clutch-off state, and the negative brake device 40 is in a brake-on state by its own spring force,
The winch drum 50 is held in the stopped state 1'8 without idling, and the hanging tool and the suspended load do not fall.

Note that when the winch drum 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 27.
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 performing the winding operation, the work switching valve 23 is switched to the sitram drive position 23b by its operating lever 23d, and then the winding direction switching valve 13 is switched to the winding position 13b by its operating lever 13d.

As a result, first, the oil discharged from the second pump P2 is changed to the arrow B1.
direction, flows into the clutch device 30, and is clutched on. After that, the oil discharged from the first pump P1 changes to arrow B2.
It flows into the motor M and tries 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 at the neutral position 24a.
Therefore, the hydraulic oil in the negative brake device 40 is guided in the direction of arrow B3 and returned to the tank T, the brake device 40 is in the brake-on state by its own spring force, and the winch drum 50 is It's 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. Along with this, the oil discharged from the second pump P2 is guided in the direction of arrow B1 and the direction of arrow B5, flows into the clutch device 30, and turns on the clutch.
The flow flows into the negative brake device 40 and the brake is turned off, causing the motor M to rotate in the hoisting direction.The rotational force is transmitted to the winch drum 50 via the power transmission mechanism 51 and the clutch device 30, and the drum 50 is rotated in the hoisting direction. It rotates and winds up.

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 this way, even if the work switching valve 23 is switched to the drum drive position 23b during winch work, pressure oil is not guided to the negative brake device 40 until the drive pressure of the motor M reaches a predetermined pressure, and the brake is turned on. and when the driving pressure exceeds a predetermined pressure, the pilot switching valve 2
4 to guide pressure oil to the brake device 40, and
By temporarily turning off the brake, the winding operation can be started smoothly without any impact load being applied to the motor M at the start of the winding operation, and the lever 13 of the winding direction switching valve 13 can be started smoothly.
So-called inching control using d can be easily performed.

Next, when performing one free fall, the winding direction switching valve 13
The first pump P1 is returned to the neutral position 13a and the work switching valve 23 is switched to the free fall position 23c.
The discharged oil is guided in the direction of arrow C1 and returned to tank T,
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, and the brake device 40 is turned off, and the clutch device 30
The hydraulic oil inside is guided in the direction of arrow C3 and returned to the tank T, the clutch is off, and the hanging tool and the hanging load freely descend while causing the winch drum 50 to idle due to their 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 23 to the neutral position 23a, the hydraulic fluid in the clutch device 30 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 hanging load are stopped, it is not necessary to press the brake pedal 61 of the positive brake device 6.0.
You can omit it. In this case, if the work selector valve 23 is suddenly returned to the neutral position 23a, the shock at the time of stopping will be large, so the spool shape of the work selector valve 23 is devised, and the lever 23d is gradually returned to the neutral position. Just apply the brakes.

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

In addition, when performing the lowering operation, the operation switching valve 23 may be switched to the drum drive position 23b as in the case of winding, and the winding direction switching valve 13 may be switched to the lowering position 13c.

As explained above, according to the present invention, both the clutch device and the brake device can be easily turned on and off by operating the lever of one work switching valve, and the drive, stop, and free fall of the winch can be easily controlled. can be done.

Furthermore, since the drive source for the motor and the pressure oil source for controlling the clutch device and brake device are separate, the clutch and brake can be controlled accurately. Further, when driving and stopping the winch, the brake is turned on until the rK driving pressure of the motor reaches a predetermined pressure, and the brake is turned off when the driving pressure exceeds the predetermined pressure, thereby making it possible to drive and stop the winch smoothly.

[Brief explanation of the drawing]

The drawings are circuit diagrams showing embodiments of the invention. Pl...first pressure oil source (first pump), P2...second
Pressure oil source (second pump), Vl...first control valve, V2...
...Second control valve, M...Winch drum drive motor,
T...Tank. 13... Winding direction switching valve, 13a... Neutral position, 13
b... Winding up position, 13c... Winding down position, 13d
...Operation lever, 13e, 13f...Spring, 17.
... Counter balance valve, 23 ... Work switching valve, 23
a... Neutral position for stopping, 23b... Drum drive U1 position, 23c... Free fall position, 24... Pilot switching valve, 30... Clutch device, 40 Negative brake device, 50... winch drum. Patent applicant Kobe Steel, Ltd.

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 a winch drum clutch device and negative brake device that directs pressure oil from a second pressure oil source to a winch drum drive motor. and a pilot switching valve that is switched when the driving pressure of the motor exceeds a predetermined pressure. There is a neutral position for stopping the winch drum, where oil is introduced into the tank, and the clutch is turned off and the brake is turned on. Pressure oil from the second pressure oil source is introduced into the clutch device, where the clutch is turned on, and the pilot switching valve is at the neutral position. Switching position i for winch work that leads the hydraulic oil in the negative brake device to the tank to turn on the brake and, when the pilot switching valve is switched, leads the pressure oil from the second pressure oil source to the negative brake device to turn off the brake. - It can be freely switched between a position and a free fall switching position where hydraulic oil in the clutch device is guided to a tank to turn off the clutch, and pressure oil from the second pressure oil source is led to a negative brake device to turn off the brake. A control device for an oilfield drive winch that is characterized by: