JPH0535987Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial field of application) This invention is based on the invention that when the winding length of the wire rope of the hydraulically driven winch reaches a preset value, the hydraulically driven winch will move in the winding direction. This invention relates to a winding length limiting device for a hydraulically driven winch that automatically stops driving.

(Prior Art) A winding length limiting device for a hydraulically driven winch configured as described above will be explained based on FIG. 2.

In general, a hydraulically driven winch, as shown in FIG.
A valve device 3 controls winch drive stop via a control device 2 in response to a payout drive command signal issued by tilting the operating lever means 1 from the neutral position to the other side.
and winding according to the operation of the operating lever means 1.
It is configured to be driven to stop and feed out. Second
In the figure, 1a and 1b are a take-up drive command signal line and a pay-out drive command signal line for transmitting the take-up drive command signal and pay-out drive command signal from the operating lever means 1 to the control device 2. 2a
and 2b are control signal lines connecting the control device 2 and the valve device 3.

This type of hydraulically driven winch employs the following winding length limiting device. That is, in FIG. 2, the winding length limiting device includes a rope winding length detecting means 5 that actually measures and detects the winding length of the wire rope 4 being wound around a hydraulically driven winch, and a winding length detecting means 5 that actually measures and detects the winding length of the wire rope 4 to be wound on a hydraulically driven winch. a rope winding length setting means 6 for setting a target winding length of the wire rope 4 from the unrolled state; and
The comparison means 7 receives both signals from the means 5 and 6 and outputs a stop signal to the control device 2 when the value of the former reaches the value of the latter.

The rope winding length setting means 6 includes a numeric keypad input means or a dial input means (not shown), and by operating this input means, the winding target length of the wire rope 4 can be arbitrarily set. It is now possible to set it to . In addition, the data regarding the set target winding length is cleared by operating the setting cancel switch 6a and applying a voltage to the setting cancel input terminal 6b, and the setting is canceled (the target winding length is infinite). It is becoming more and more like this.

The rope winding length detecting means 5 detects a sheave 5a disposed in the middle of the wire rope, and this sheave 5a.
a pulse signal generator (e.g., a rotary encoder) 5b which is connected in conjunction with the rope and converts the rotational movement of the sheave 5a into an electric pulse signal, and a pulse signal generator that generates a pulse signal when a target winding length is set in the rope winding length setting means 6; The integrated counting means 5c integrally counts the output pulses of the device 5b and outputs an electric signal corresponding to the integrated result to the comparing means.

The control device 2 is configured to place the valve device 3 at the hydraulically driven winch stop position with priority over the winding command signal from the operating lever means 1 when the stop signal from the comparison means 7 is input. There is. That is, when a stop signal is output from the comparison means 7, the valve device 3 is set to the neutral position (hydraulic drive winch stop position) even if the operating lever means 1 is tilted in the winding direction. .

The conventional winding length control device for a hydraulically driven winch configured as described above sets the wire rope winding length from the wire rope 4 in any unwinding state to the rope winding length setting means 6. When the setting is input and then the operating lever means 1 is tilted in the winding direction to drive the wire rope 4 to be wound, the winding length of the wire rope 4 changes to the setting value set in the rope winding length setting means 6. When this is reached, the winding drive of the hydraulically driven winch automatically stops. When the hydraulically driven winch is to be further driven to take up the rope after the single winding length limiting device has worked, the setting release switch 6a of the rope winding length setting means 6 is operated to release the setting. .

Such a winding length control device for a hydraulically driven winch can be used as an underground line drawing winch, a towing winch, or a crane winch for drawing communication cables (including optical fiber cables) into underground culverts. It is used in hydraulically driven winches that need to wind up a wire rope from a specific wire rope unwinding state to a predetermined arbitrary position.

(Disadvantages of the Prior Art) By the way, in the winding length limiting device of the hydraulically driven winch configured as described above, when the single winding length limiting device is activated, the setting release switch 6a is operated to set the rope winding length. Unless the means 6 is brought into the setting release state, the wire rope 4 cannot be wound any further, and in that case it is troublesome to operate the setting release switch; The problem was that it was a hassle.

The winding length limiting device for a hydraulically driven winch of the present invention solves the problems of the prior art described above, and further extends the wire rope 4 after the winding length limiting device works and the winding drive of the hydraulically driven winch stops. When the need arises to perform winding drive, the setting release switch 6
A novel winding length limiting device that can set the rope winding length setting means 6 in a setting-released state by simply returning the operating lever means 1 to the neutral position without operating a, that is, rope winding length setting. The present invention aims to provide a winding length limiting device in which the setting of the means 6 can be easily canceled.

(Means for Solving the Problems) The winding length limiting device of the present invention is such that when the comparison means is in a stop signal output state and the winding drive command signal from the operating lever means disappears, the rope winding This configuration includes a set value cancellation signal generating means for canceling the set value regarding the rope winding target length set in the length setting means.

(Function) According to the above configuration, after the winding length of the wire rope 4 reaches the set value and the winding drive of the hydraulic drive winch stops, the rope winding can be carried out by simply returning the operating lever means 1 to the neutral position. Since the length setting means 6 is in the setting release state, the wire rope 4 can be further wound and driven by tilting the operating lever means 1 in the winding direction again. In other words, additional wire ropes 4 can be wound and driven without operating the setting release switch 6a.

(Example) An example of the present invention will be described based on FIG.
Since the present invention is obtained by adding a part of the structure to the conventional winding length limiting device shown in FIG. 2 and described above as the prior art, only the added part will be explained below.

In FIG. 1, reference numeral 8 denotes a set value release signal generating means. This set value release signal generating means 8 is activated when the comparison means 7 is in the stop signal output state and the winding drive command signal from the operating lever means 1 disappears (the operating lever means 1 is returned to the neutral position and the winding When the winding drive command signal is not output to the drive command signal line 1a), a set value release signal is output to the rope winding length setting means 6, and the rope winding target length set in the rope winding length setting means 6 is set. This eliminates the setting values related to In this embodiment, the set value release signal generating means 8 outputs a relay switch 8a which is connected when the stop output signal is output from the comparing means 7.
and the winding drive command signal line 1a of the operating lever means 1.
A relay switch 8b, which is connected when the winding drive command signal disappears, is interposed in series between the power source and the setting release input terminal 6b of the rope winding length setting means 6.

Next, the action will be explained. Rope winding length setting means 6
After setting the target rope winding length, when the operating lever means 1 is operated to the winding drive side to drive the wire rope 4, when the winding length of the wire rope 4 reaches the target value, the comparison means 7 outputs a stop signal to the control means 2, and the winding drive of the hydraulically driven winch is automatically stopped, as in the conventional case.

In this stopped state (the operating lever means 1 is operated to the winding drive side, a winding drive command signal is output to the winding drive command signal line 1a, and a stop signal is output from the comparison means 7). ) Then,
Relay switch 8a of set value release signal generation means 8
is connected, and relay switch 8a is disconnected. Therefore, the set value release signal generating means 8
No setting cancellation signal is input from the rope winding length setting means 6 to the setting cancellation input terminal 6b.

Next, when the operating lever means 1 is returned to the neutral position, the winding drive command signal on the winding drive command signal line 1a disappears, so the set value cancellation signal generating means 8
The relay switch 8b is closed, and as a result, a setting value cancellation signal is input to the setting cancellation input terminal 6b of the rope winding length setting means 6. As a result, when the set value of the rope winding length setting means 6 is canceled, the stop signal from the comparison means 7 disappears, and from now on, the hydraulically driven winch can be arbitrarily driven to wind by tilting the operating lever means 1. be.

Incidentally, in the above embodiment, the operating lever means 1
The control signal transmitted from the control lever 1 to the valve device 3 via the control device 2 is an on/off signal, and the operating lever means 1 uses a voltage signal corresponding to the amount of tilting from its neutral position as a winding drive command signal. The control device 2 is configured to output to the line 1a and the feed drive command signal line 1b, and the control device 2 is configured to amplify the voltage signals from these signal lines 1a and 1b and transmit them to the valve device 3. Of course, the amount of operation may be arbitrarily determined depending on the amount of tilting of the lever means 1. In this case, the relay switch 8b of the set value release signal generating means 8 is activated when the voltage signal flowing through the winding drive command signal line 1a is below a predetermined value (when the operating lever means 1 is tilted toward the winding drive side). It may be configured with a switch that is turned on when the voltage level (below the voltage level that occurs) is reached.

(Effect) In any case, the winding length limiting device in the hydraulically driven winch of the present invention is such that after one part of the winding drive of the wire rope 4 is automatically stopped, it must be manually operated separately as in the conventional one. Setting release switch 6
Even without canceling the set value of the rope winding length setting means 6 by operating a, the operating lever means 1 can be simply returned to neutral to enable the subsequent winding drive of the hydraulically driven winch. The operation becomes extremely simple, and the workability of the hydraulically driven winch can be improved accordingly.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an embodiment of the winding length limiting device for a hydraulically driven winch according to the present invention, and FIG. 2 is an explanatory diagram of a conventional device. Operating lever means...1, Control device...2, Valve device...3, Rope winding length detection means...5, Rope winding length setting means...6, Comparison means...7, Set value release signal generation Means...8.

Claims (1)

[Scope of utility model registration request] A take-up drive command signal issued by tilting the operating lever means in one direction from the neutral position and a payout drive command signal issued by tilting the operating lever means in the other direction from the neutral position are used to drive the winch via the control device. A winding length limiting device used in a hydraulically driven winch, in particular a winding length limiting device used in a hydraulically driven winch, configured to transmit information to a valve device in charge of stopping and to be driven to wind, stop, and unwind in accordance with the operation of an operating lever means. Rope winding length detection means for actually measuring and detecting the winding length of the wire rope, Rope winding length setting means for setting a target winding length of the wire rope from the said unwinding state in any unwinding of the wire rope; , comprising comparison means for receiving both signals from the two means and outputting a stop signal to the control device when the value of the former reaches the value of the latter, and the control device receives the stop signal from the comparison means; In the case where the valve device is configured to set the hydraulically driven winch to the stop position with priority over the winding command signal, when the comparison means is in a stop signal output state and the winding drive command from the operating lever means is not received. Winding length of a hydraulically driven winch, characterized in that it is provided with set value cancellation signal generation means for canceling the set value regarding the rope winding target length set in the rope winding length setting means when the signal disappears. restriction device.