JPH115693A - Hydraulic winch unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate slippage between both points at the time of winding or lowering start and of braking release, and also to operate a brake surely even if there is something wrong with the side of a winch circuit. SOLUTION: A selector valve 18 to be switched in space between a motor working pressure inlet position (a) and motor working pressure cutoff position (b) is installed in a pilot line 13 conducting the motor working pressure to a hydraulic pilot operated brake valve 10, and then this selector valve 18 is switched to the motor working pressure inlet position (a) at the time of operating a remote control valve 15 to operate a control valve 14, and thereby a brake 3 is released, and when this remote control valve 15 is put back to neutrality, the brake 3 is made to operate irrespective of whether there is the motor working pressure or not.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic winch device with a brake mounted on a crane.

[0002]

2. Description of the Related Art FIG. 5 shows a general structure of a conventional hydraulic winch device.

In this hydraulic winch device, a winch circuit A for controlling the operation of a winch motor 2 as a rotary drive source of a winch drum 1 and a brake for controlling the operation of a negative type (brake release when hydraulic pressure is supplied) hydraulic brake 3 are provided. And a circuit B.

In the winch circuit A, a counterbalance valve 4 as a brake valve for suspending the suspended load is provided in the winding upper side pipe 5 of the motor side pipes 5 and 6, and the motor both side pipes are provided. A direct-acting control valve 9 operated by an operation lever 8 is provided between the hydraulic pump 7 and the tank T, and the rotation direction (winding, lowering) of the winch motor 2 by the control valve 9. Rotation) and speed are controlled.

[0005] The brake circuit B is provided with a brake valve 10 which is a hydraulic pilot type switching valve for controlling the operation of the hydraulic brake 3.

The brake valve 10 is connected to the brake hydraulic pressure source 1
A brake release position a for supplying the hydraulic pressure from 1 to the hydraulic brake 3 to release the brake, and a brake position b for operating the brake 3 by releasing the hydraulic pressure of the brake 3 to the tank T.
It switches between and operates.

As means for operating the brake valve 10, a shuttle valve (high-pressure selection valve) 12 for taking out the pressure (motor operating pressure) generated in the motor-side pipes 5, 6 in the winch circuit A when the winch motor 2 rotates is provided. The motor operating pressure taken out by the shuttle valve 12 is introduced to the brake valve 10 via the pilot line 13 as pilot pressure. Thereby, the brake valve 1
0 switches to the brake release position a.

In this manner, the hydraulic brake 3 is released at the same time as the hoisting or lowering operation by the rotation of the winch motor 2 (winch drum 1) is started, and the hydraulic brake 3 is operated at the same time as the hoisting or lowering operation ends. (The winch drum 1 stops braking).

[0009]

However, the conventional direct-acting circuit configuration for directly operating the control valve 9 has the following drawbacks.

When a failure occurs in the winch circuit A, for example, when the counterbalance valve 4 is malfunctioned due to the bite of dust or the like and the intended load holding function cannot be performed, the oil is wound around the valve 4. Even if the control valve 9 is returned to the neutral position, the winch motor 2 rotates and a pressure builds up in the circuit A, and this pressure is introduced into the brake valve 10 as pilot pressure. However, the brake valve 10 remains in the brake release position a and the hydraulic brake 3 does not operate even though the hydraulic brake 3 has returned to the neutral position.

On the other hand, as shown in FIG. 6, a hydraulic pilot type control valve 14 may be used, and the control valve 14 may be operated by a remote control valve 15 to form a remote control type circuit configuration.

In this case, the pilot pressure of the remote control valve 15 is taken out by the shuttle valve 16 and the pilot line 13
A configuration is provided in which the pilot pressure is supplied to the brake valve 10 via the controller.

According to this remote control circuit configuration, since the winch circuit A and the brake circuit B are separated as a hydraulic circuit, the winch circuit A is connected to the counter balance valve 4.
If the remote control valve 15 is returned to the neutral position, the brake valve 10 is always switched to the brake position b even if a failure or the like occurs.

However, according to this remote control circuit, the winch motor 2 actually starts rotating by operating the remote control valve 15 (start of the hoisting or lowering operation) and the time when the hydraulic brake 3 is released. It is easy for misalignment to occur.
If the start of operation is early (brake release is slow), a shock will occur when the winch drum rotates and the suspended load will shake,
(B) Conversely, if the operation start is slow (brake release is fast), there is another problem that the suspended load instantaneously falls.

Accordingly, the present invention provides a hydraulic winch device which does not cause a difference between the start time of hoisting or lowering and the release time of the brake, and can reliably operate the brake even if a failure occurs on the winch circuit side. Is what you do.

[0016]

According to a first aspect of the present invention, there is provided a winch circuit for controlling the operation of a winch motor serving as a rotary drive source of a winch drum, and a brake for controlling the operation of a hydraulic brake provided on the winch drum. A control valve for controlling supply and discharge of pressure oil to and from the winch motor, and operating means for operating the control valve.The brake circuit includes a hydraulic brake. A hydraulic pilot type brake valve that switches between a brake position to be operated and a brake release position to release the brake operation is provided. The brake valve is a motor operating pressure generated in a winch circuit when the winch motor rotates. To the brake release position when introduced through the pilot line as pilot pressure. In the hydraulic winch device configured as described above, the pilot line of the brake valve is switched between a motor operating pressure introducing position for guiding the motor operating pressure to the brake valve and a motor operating pressure shutoff position for shutting off the motor operating pressure. A switching valve is provided, and the switching valve is located at the motor operating pressure introducing position when the operating means is operated.
When the operating means is not operated, it is configured to be set to the motor operating pressure cut-off position.

According to a second aspect of the present invention, in the configuration of the first aspect, a hydraulic pilot type valve is used as the control valve.
A remote control valve that supplies pilot pressure to the control valve as an operating means, and a hydraulic pilot type valve is used as a switching valve, and pilot pressure supplied from the remote control valve to the control valve is supplied to the switching valve as pilot pressure. It is configured as follows.

According to a third aspect of the present invention, in the first aspect, a hydraulic pilot valve is used as the control valve.
A remote control valve for supplying pilot pressure to the control valve as an operating means, an electromagnetic valve as a switching valve, and a switching valve controller for controlling the operation of the electromagnetic switching valve are provided. Is configured to switch the switching valve to a motor operating pressure introduction position by using a pilot pressure supplied from the remote control valve to a control valve as a trigger.

According to a fourth aspect of the present invention, in the configuration of the first aspect, a manual valve is used as the control valve and the switching valve, and an operation lever for manually operating the control valve is used as the operating means. The valves are interlocked so that they are simultaneously operated by operating the operation lever.

According to the above construction, the operation means (claim 2,
When the remote control valve is operated in the third embodiment and the operation lever is operated in the fourth embodiment, the switching valve is switched to the motor operating pressure introducing position.

On the other hand, when the winch motor is rotated by the operation of the operating means, the motor operating pressure generated in the winch circuit is supplied to the switching valve as the inlet pressure.

That is, since the brake is activated when the winch motor actually starts to rotate and the motor operating pressure is generated, the start of the hoisting or lowering operation and the timing of the brake release can be synchronized.

When the operating means is returned to the neutral position, the switching valve is switched to the motor operating pressure cut-off position. Therefore, at this time, even if a failure occurs in the winch circuit, for example, a counterbalance valve occurs, and pressure builds up in the circuit. This pressure is blocked by the switching valve and is not introduced to the brake valve as pilot pressure.

Therefore, the brake can be operated reliably when the operating means is in the neutral position.

According to the third aspect of the present invention, when the pilot pressure is supplied to the control valve by operating the remote control valve as the operating means, the switching valve controller uses the pilot pressure as a trigger to operate the switching valve. The position is switched to the operating pressure introduction position, and the brake is released.

For this reason, the start of the hoisting or hoisting operation and the timing of releasing the brake can be adjusted by the switching valve controller.

On the other hand, according to the configuration of the fourth aspect, the control valve and the switching valve are switched in conjunction with each other by operating the common operation lever, and when the motor operating pressure is generated, this is transmitted to the brake valve via the switching valve and the pilot valve. Introduced as pressure.

That is, the intended object of the present invention can be achieved even in a direct-acting circuit.

[0029]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.

In the following embodiment, FIGS.
The same parts as those of the conventional device shown in FIG.
The duplicate description is omitted.

First Embodiment (see FIG. 1) In this embodiment, a remote control type circuit configuration similar to that of the conventional device shown in FIG. The pressure is supplied to the control valve 14 as a pilot pressure, and at the same time, the circuit is taken out via the first shuttle valve 16.

Further, the motor operating pressure generated in one of the motor-side pipe lines 5 and 6 when the winch motor 2 rotates is taken out by the second shuttle valve 17.

The pilot line 13 is provided with a switching valve 18 of a hydraulic pilot type.
The remote control pressure extracted by 6 is supplied to this switching valve 18 as pilot pressure, and the motor operating pressure extracted by the second shuttle valve 17 is supplied to the switching valve 18 as inlet pressure.

The switching valve 18 is set to the motor operating pressure cut-off position a shown in the figure when not operating (when the pilot pressure is not supplied), and switches to the motor operating pressure introducing position b when operating.

The motor operating pressure is shut off by the switching valve 18 at the motor operating pressure shut-off position a, and is introduced as pilot pressure to the brake valve 10 via the switching valve 18 at the motor operating pressure introducing position b.

Therefore, when the remote control valve 15 is operated and the winch motor 2 actually starts to rotate and a motor operating pressure is generated, the brake valve 10 switches to the brake release position and the brake 3 is released.

That is, the starting point of the hoisting or lowering operation of the winch drum 1 and the release point of the brake surely coincide with each other, and these timings are shifted to cause a shock at the start of the hoisting or lowering operation. There is no danger of the suspended load dropping instantaneously.

When the remote control valve 15 is returned to the neutral position, the switching valve 18 returns to the motor operating pressure shut-off position b.
At this time, even if a failure occurs in the counter balance valve 4 in the winch circuit A, for example, and pressure rises in the pipelines 5 and 6 of the circuit A, this pressure is blocked by the switching valve 18 and the pilot pressure is applied to the brake valve 10 as pilot pressure. Will not be introduced.

Therefore, when the remote control valve 15 is returned to the neutral position, the brake valve 10 also returns to the brake position b, and the brake 3 operates reliably.

Second Embodiment (see FIG. 2) In the following embodiment, only differences from the first embodiment will be described.

In the second embodiment, a remote-controlled circuit configuration is adopted, and (i) an electromagnetic switching valve 19 is used instead of the hydraulic pilot switching valve 18 of the first embodiment.
The switching valve 19 is controlled by an electric signal from the switching valve controller 20, and (iii) a circuit configuration in which the remote control pressure of the remote control valve 15 is converted into an electric signal by the pressure switches 21 and 22 and then input to the switching valve controller 20. I am taking.

The switching valve controller 20 outputs an operation signal to the switching valve 19 by using an input signal from the pressure switches 21 and 22 as a trigger.

As a result, the switching valve 19 is switched from the motor operating pressure cut-off position b to the motor operating pressure introducing position a, and the motor operating pressure is introduced to the brake valve 10 as pilot pressure. And the brake 3 is released.

When the remote control valve 15 is not operated (no remote control pressure is generated), no operation signal is output from the switching valve controller 20 to the switching valve 19 regardless of the presence or absence of the motor operating pressure. It will not be released.

According to this configuration, the switching valve controller 2
With the setting of 0, the brake release timing can be adjusted with respect to the start time of the hoisting or hoisting operation as desired.

Third Embodiment (See FIG. 3) In this embodiment, a direct-acting circuit configuration similar to that of the apparatus shown in FIG. 5, that is, a manual control valve 9 is operated by an operating lever 8 to reduce the motor operating pressure. Shuttle valve 23
A circuit configuration for taking out to the pilot line 13 is adopted.

Further, a manual switching valve 24 is used in place of the hydraulic pilot switching valve 18 of the first embodiment and the electromagnetic switching valve 19 of the second embodiment, and this switching valve 24 is linked to the control valve 9. 25, the control valve 9 and the switching valve 24 are simultaneously switched and operated by operating the operation lever 8.

The switching valve 24 is configured as a three-position switching valve having an intermediate motor operating pressure shut-off position b and motor operating pressure introduction positions a1 and a2 on both sides. By switching to one of the introduction positions a1 and a2, the motor operating pressure is introduced into the brake valve 10 as pilot pressure.

According to this configuration, the brake 3 is released only when the operation lever 8 is operated and the winch motor 2 is actually rotated, so that there is no difference between the operation timings.

Further, when the operating lever 8 is returned to the neutral position, the switching valve 24 also returns to the motor operating pressure shut-off position b and the brake valve 10 returns to the brake position b, so that the brake 3 is reliably operated.

By the way, the first remote control type circuit configuration is adopted.
In the embodiment, the remote control pressure generated by the operation of the remote control valve 15 is introduced to the switching valve 17 via the shuttle valve 16, but as shown in FIG. Operating pressure introduction position a
Hydraulic pilot type three-position switching valve 26 having 1, a2
, And the remote control pressure may be directly introduced into the switching valve 26 as the pilot pressure.

[0052]

As described above, according to the present invention, only when the operating means (the remote control valve in the second and third aspects and the operation lever in the fourth aspect) is operated to rotate the winch motor, the motor operating pressure is reduced. Is introduced as a pilot pressure into the brake valve, and the valve is switched to the brake release position, and the brake is released, so that the start of the hoisting or lowering operation and the timing of the brake release can be reliably matched. .

When the operating means is returned to the neutral position, the switching valve is switched to the motor operating pressure cut-off position. At this time, even if a failure occurs in the winch circuit, for example, a counterbalance valve occurs, and the pressure rises in the circuit. This pressure is blocked by the switching valve, and is not introduced as a pilot pressure to the brake valve, so that the brake can be reliably operated when the operating means is neutral.

According to the third aspect of the present invention, when the pilot pressure is supplied to the control valve by operating the remote control valve as the operating means, the switching valve is operated by the switching valve controller using the pilot pressure as a trigger. Since the operation pressure is switched to the operation pressure introduction position and the brake is released, the start of the hoisting or hoisting operation and the timing of releasing the brake can be adjusted by the switching valve controller.

On the other hand, according to the invention of claim 4, the control valve and the switching valve are switched in conjunction with each other by operating a common operating lever, and when a motor operating pressure is generated, this is transmitted to the brake valve via the switching valve by the pilot valve. Since the pressure is introduced as a pressure, the intended object of the present invention can be achieved even in a direct-acting circuit.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram of a winch device according to a first embodiment of the present invention.

FIG. 2 is a circuit configuration diagram of a winch device according to a second embodiment of the present invention.

FIG. 3 is a circuit configuration diagram of a winch device according to a third embodiment of the present invention.

FIG. 4 is a circuit configuration diagram of a winch device according to an embodiment in which a part of the first embodiment is modified.

FIG. 5 is a circuit configuration diagram of a conventional winch device.

FIG. 6 is a circuit configuration diagram of another conventional winch device.

[Explanation of symbols]

Reference Signs List A Winch circuit B Brake circuit 1 Winch drum 2 Winch motor 3 Hydraulic brake 7 Hydraulic pump 8 Operating lever as operating means 10 Brake valve 9, 14 Control valve 15 Remote control valve as operating means 17 Shuttle valve for extracting motor operating pressure 18, 19, 24, 26 Switching valve 20 Switching valve controller 25 Link for interlocking connection between control valve and switching valve

Claims (4)

[Claims] A winch circuit that controls the operation of a winch motor that is a rotation drive source of the winch drum; and a brake circuit that controls the operation of a hydraulic brake provided on the winch drum. The winch circuit includes: A control valve for controlling the supply and discharge of pressure oil to and from the winch motor and operating means for operating the control valve are provided, and the brake circuit releases a brake position for operating the hydraulic brake and releases the operation of the brake. A hydraulic pilot type brake valve is provided for switching between a brake release position and a brake release position, and is introduced via a pilot line as a pilot pressure using a motor operating pressure generated in a winch circuit when the winch motor rotates. Hydraulic winch device configured to switch to the brake release position A switching valve for switching between a motor operating pressure introducing position for guiding the motor operating pressure to the brake valve and a motor operating pressure shutoff position for shutting off the motor operating pressure is provided in a pilot line of the brake valve; The switching valve is configured to be set to the motor operating pressure introducing position when the operating means is operated, and to the motor operating pressure shut-off position when the operating means is not operated. Winch device. 2. The hydraulic winch device according to claim 1, wherein the control valve is a hydraulic pilot type valve.
A remote control valve that supplies pilot pressure to the control valve as an operating means, and a hydraulic pilot type valve is used as a switching valve, and pilot pressure supplied from the remote control valve to the control valve is supplied to the switching valve as pilot pressure. A hydraulic winch device characterized by being configured as described above. 3. The hydraulic winch device according to claim 1, wherein the control valve is a hydraulic pilot type valve.
A remote control valve for supplying pilot pressure to the control valve as an operating means, an electromagnetic valve as a switching valve, and a switching valve controller for controlling the operation of the electromagnetic switching valve are provided. Is a hydraulic winch device configured to switch the switching valve to a motor operating pressure introduction position by using a pilot pressure supplied from the remote control valve to a control valve as a trigger. 4. The hydraulic winch device according to claim 1, wherein a manual valve is used as the control valve and the switching valve, and an operation lever for manually operating the control valve is used as the operating means. A hydraulic winch device, wherein the hydraulic winch device is interlocked and connected so as to operate simultaneously by operating the operation lever.