JP5156469B2 - Winch equipment - Google Patents

Description

  The present invention relates to a winch device.

  Conventionally, a pressure switch (pressure sensor) is connected to the pilot pressure supply line that guides the operating pilot pressure to the control valve. When lever operation is detected by this pressure switch, brake release pressure is supplied to the brake device, and the winch drum There is known a device that releases a brake acting on the motor (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 7-8389

  However, when the brake is released by the electrical signal from the pressure switch as in the device described in Patent Document 1, the brake release operation is performed when there is an abnormality such as a poor connection or disconnection of the electrical signal. It may become unstable and induce undesired winch drum movement.

A winch device according to the present invention includes a winch drum, a brake device that stops the rotation of the winch drum, a hydraulic motor that drives the winch drum to be wound up and down by oil discharged from the hydraulic pump, and a pressure from the hydraulic pump to the hydraulic motor. Direction control valve that controls the flow of oil, operation member that operates the direction control valve, operation detection means that detects at least a lowering operation of the operation member, and a lowering operation signal from the operation detection means is normal or abnormal The neutral operation signal is detected by the neutral detection means and the neutral detection means for detecting the neutral operation signal of the operation member directly or indirectly in a system different from the operation signal determination means and the operation detection means. If no, it is determined that the drive pressure to the hydraulic motor is driven pressure supply state can be supplied, a place neutral operation signal is detected by the neutral detection means , Thereby determining not to be the drive pressure supply state, (1) is determined Makisage operation signal is normal by the operation signal determination unit, and, when Rimaki lowering operation by the operation detection means detects the brake device release the, (2) Makisage operation signal is determined to be abnormal by the operation signal determination means during lowering operation of the operating member, to operate the braking device, is maintained (3) the lowering operation state, it is determined that Makisage operation signal is successfully restored from the abnormality by the operation signal determination unit, and, when it is determined that the drive pressure supply state, maintaining the operation of the brake device, (4) After the neutral operation signal of the operation member is detected in a state where the operation of the brake device is maintained, the lowering operation signal is determined to be normal by the operation signal determining means, and the lowering operation is detected by the operation detecting means. When it is done Characterized in that it comprises a brake control means for canceling the rake device.

  According to the present invention, when the operation signal returns to normal, release of the brake device is permitted on the condition that the driving pressure is not supplied to the motor, so that an undesirable movement of the winch drum can be prevented.

Hereinafter, an embodiment of a winch device according to the present invention will be described with reference to FIGS.
FIG. 1 is a hydraulic circuit diagram showing a configuration of a winch device according to an embodiment of the present invention, and FIG. 6 is an external side view of a crane having the winch device. As shown in FIG. 6, the crane includes a traveling body 101, a revolving swivel body 102 mounted on the traveling body 101, and a boom 103 supported by the revolving body 102 so as to be raised and lowered. A winch drum 1 is mounted on the swivel body 102, and the wire rope 104 is wound or lowered by driving the winch drum 1, and a suspended load (such as a bucket for excavation) 106 is moved up and down. The swinging body 102 is equipped with a hoisting drum 107, and the hoisting rope 107 is wound or lowered by driving the hoisting drum 107, and the boom 103 is hoisted.

  As shown in FIG. 1, the winch device includes a winch drum 1, a variable displacement hydraulic motor 2 that drives the winch drum 1, and a pair of variable capacities that are driven by the engine M and supply drive hydraulic oil to the hydraulic motor 2. Type hydraulic pumps 3 and 4, direction control valves 5 and 6 for controlling the flow of pressure oil from the hydraulic pumps 3 and 4 to the hydraulic motor 2, and an operation lever 7 for operating the direction control valves 5 and 6, The pilot pump 8 is driven in accordance with the operation amount of the operation lever 7, and pilot valves 9a and 9b for supplying pilot pressure from the pilot pump 8 to the direction control valves 5 and 6 and a brake for stopping the rotation of the winch drum 1 Device 10. The capacity of the hydraulic motor 2 is controlled by a regulator 2a. The direction characteristic of the directional control valve 6 is set so that the directional control valve 6 is switched with a pilot pressure smaller than that of the directional control valve 5.

  The brake device 10 is a neutral negative brake that operates when neutral and is released by a pilot pressure (brake release pressure) from the pilot pump 8, and the flow of pilot pressure to the brake device 10 is controlled by an electromagnetic switching valve 11. . That is, when the electromagnetic switching valve 11 is switched to the position B, the flow of pressure oil to the brake device 10 is cut off, and the brake device 10 is activated. When the electromagnetic switching valve 11 is switched to the position A, pressure oil is supplied to the brake device 10 and the brake device 10 is released. The brake device 10 is controlled by a signal from the controller 20.

  Pressure sensors 12 and 13 are respectively connected to the pipes L1 and L2 connecting the pilot valves 9a and 9b and the pilot ports of the direction control valves 5 and 6, and the operation of the operation lever 7 is detected by the pressure sensors 12 and 13. The The pilot pressure from the pilot valves 9 a and 9 b is supplied as a motor tilt control pressure to the motor regulator 2 a via the shuttle valve 14, and this pilot pressure is detected by the pressure sensor 15.

  FIG. 2 is a characteristic diagram illustrating an example of the operation signal v output from the pressure sensors 12 and 13. When the input voltage is v0 (for example, 5v) and the operation signal v is normal, the operation signal at the neutral position of the operation lever 7 is v1 (for example, 0.5v), and the operation signal at the maximum operation is v2 (for example, 4). .5v), and the operation signal v varies proportionally between v1 and v2 according to the lever operation amount. On the other hand, when the signal lines of the sensors 12 and 13 are disconnected or short-circuited, the operation signal v is 0 or v0, which is smaller than v1 or larger than v2. In this case, the operation signal v is abnormal.

  The controller 20 includes an arithmetic unit having a CPU, ROM, RAM, and other peripheral circuits. The controller 20 receives signals from the pressure sensors 12 and 13 and the pressure sensor 15. The controller 20 executes the following processing based on these input signals, and outputs control signals to the electromagnetic switching valve 11 and the monitor 21, respectively.

  FIG. 3 is a flowchart illustrating an example of processing executed by the CPU. The process shown in this flowchart is started, for example, by turning on the power key. In step S1, it is determined whether or not the operation signals v of the pressure sensors 12 and 13 are both normal, that is, whether or not the condition of v1 ≦ v ≦ v2 is satisfied. If step S1 is affirmed, the process proceeds to step S7, and it is determined whether or not the neutral operation is detected by the pressure sensors 12 and 13, that is, whether or not the operation signal v is v1.

  If step S7 is negative, that is, if a hoisting or lowering operation is detected, the process proceeds to step S6, where a control signal is output to the electromagnetic switching valve 11 to switch the electromagnetic switching valve 11 to position a. As a result, the brake release pressure acts on the brake device 10 and the brake device 10 is released. On the other hand, if step S7 is affirmed, the process proceeds to step S8, where a control signal is output to the electromagnetic switching valve 11 to switch the electromagnetic switching valve 11 to position b. Thereby, the action of the brake release pressure on the brake device 10 stops, and the brake device 10 operates. When the process of step S6 or step S8 ends, the process returns to step S1.

  If it is determined in step S1 that the operation signal v is not normal, that is, v <v1 or v> v2, the process proceeds to step S2. In step S2, a control signal is output to the electromagnetic switching valve 11 to switch the electromagnetic switching valve 11 to the position B, and the brake device 10 is operated. Next, in step S3, a control signal is output to the monitor 21 to display that the operation signal v is abnormal, and abnormal information is stored in the memory. This abnormality information cannot be erased by the operator himself, and once the abnormality information is displayed, it will continue to be displayed until the service person checks the sensors 12 and 13 and performs a predetermined reset operation.

  In step S4, it is determined whether or not the operation signal v is normal, that is, whether or not the operation signal v has returned to a normal state (v1 ≦ v ≦ v2) due to poor contact or the like. If step S4 is affirmed, the process proceeds to step S5. If negative, the process returns to step S2. In step S5, it is determined based on a signal from the pressure sensor 15 whether or not the operation lever 7 is neutral. For example, when the detection value P of the sensor 15 is a predetermined value P0, the operation lever 7 is determined to be neutral. If step S5 is affirmed, the process returns to step S1, and if negative, the process returns to step S2.

The main operation of the winch device according to the present embodiment will be described.
(1) Normal When the operation signal v is normal and the operation lever 7 is operated to the neutral position, the brake device 10 operates (step S8). This prevents the winch drum 1 from rotating. For example, when the operation lever 7 is lowered from this state, the electromagnetic switching valve 11 is switched to the position A as shown in FIG. 4, and the brake device 10 is released (step S6). At this time, the pilot pressure is applied to the direction control valves 5 and 6 through the pipe L2, and the direction control valve 6 is switched to the lowering position as illustrated. As a result, the pressure oil from the hydraulic pump 4 is supplied to the hydraulic motor 2 via the direction control valve 6, the counterbalance valve 16 is opened by this lowering driving pressure, and the winch drum 1 is driven to lower.

(2) At the time of abnormality As shown in FIG. 5, for example, when a disconnection occurs due to poor contact at the connection point between the pressure sensor 13 and the controller 20, the operation signal v becomes abnormal (v = 0). As a result, the brake device 10 is operated, and the abnormality information is displayed on the monitor 21 (step S2, step S3). At this time, the output of the operation signal v is unstable. Even if the operation signal v returns to the normal state, the brake device 10 is not released when the operation lever 7 is operated to be lowered (step S5). → Step S2). Thereby, the runaway of the hydraulic motor 2 can be prevented.

  That is, in a state where the operation lever 7 is lowered, the driving pressure acts on the hydraulic motor 2 and the counter balance valve 16 is opened. For this reason, if the brake device 10 is released in this state, the motor rotation speed exceeds the set rotation speed, and the hydraulic oil supply amount to the hydraulic motor 2 is insufficient, and the hydraulic motor 2 may be in a runaway state. In this respect, in the present embodiment, the brake device 10 is not released while the operation lever 7 is being lowered, so that the hydraulic motor 2 can be prevented from running away.

  When the operation signal v returns from the abnormal state to the normal state, when the operation lever 7 is operated to the neutral position, the detected value of the pressure sensor 15 becomes P0. When the lowering operation is performed from this state, the brake device 10 is released (step S5 → step S1 → step S6). As a result, the brake device 10 is released only when the motor drive pressure is not applied, so that the suspended load can be prevented from suddenly dropping when the brake is released, and the winch drum 1 is wound at a speed corresponding to the lever operation amount. Can be driven down. In this case, even if the operation signal returns to the normal state, the abnormality information continues to be displayed on the monitor 21, so that the operator can always be alerted.

  Even when the operation signal v returns to normal from the abnormality during the winding operation, the operation is the same as that during the winding operation. Thereby, it is possible to prevent the brake device 10 from being released in a state where the hoisting driving pressure is applied, and it is possible to prevent the occurrence of shock due to the sudden rotation of the motor 2.

According to the present embodiment, the following operational effects can be achieved.
(1) The controller 20 determines whether the operation signal v from the pressure sensors 12 and 13 is normal or abnormal, and when the operation signal v is normal, the hoisting or lowering operation is detected by the signal from the pressure sensors 12 and 13. Then, the electromagnetic switching valve 11 is switched to release the brake device 10, and when the operation signal v is abnormal, the release of the brake device 10 is prohibited even if the hoisting or lowering operation is detected. Further, it is determined whether or not the operation lever 7 is neutral based on a signal from the pressure sensor 15, and when the operation signal v is determined to return to normal from an abnormality, it is determined that the lever is neutral based on a signal from the pressure sensor 15. On this condition, the release of the brake device 10 by allowing the operation lever 7 to be raised or lowered is permitted, and when it is determined that the lever is not neutral, the release of the brake device 10 is prohibited. As a result, it is possible to prevent the brake device 10 from being released while the drive pressure is supplied to the hydraulic motor 2, and to prevent undesired movement of the winch drum 1.

(2) Since the pressure sensor 15 is provided separately from the pressure sensors 12 and 13 and the neutral operation of the operation lever 7 is detected by a system different from the pressure sensors 12 and 13, the brake is applied without the lever 7 being neutrally operated. It is possible to reliably prevent the device 10 from being released.
(3) Since the release operation of the brake device 10 is controlled according to the signal from the pressure sensor 15 when the operation signal v of the pressure sensor 13 for detecting the lowering operation returns to normal from the abnormality, the hydraulic pressure is The runaway of the motor 2 can be prevented.
(4) When the operation signal v is determined to be abnormal, the abnormality information is displayed on the monitor 21 even if the operation signal v is determined to return to normal from the abnormality. it can.

  In the above embodiment, the neutral operation is detected by the pressure sensor 15 and it is determined whether or not the driving pressure supply state in which the motor driving pressure can be supplied is determined (step S5). Not limited to this. For example, as shown in FIG. 7, pressure sensors 17 and 18 for detecting motor driving pressure are respectively connected to pipe lines between the control valves 5 and 6 and the hydraulic motor 2, and the detected values of the pressure sensors 17 and 18 are predetermined. When the value is equal to or greater than a value (for example, 0), it may be determined that the drive pressure is supplied. The operation of the operation lever 7 may be detected by a limit switch or the like to determine the driving pressure supply state.

  In the above embodiment, the brake release pressure is supplied to the brake device 10 to release the brake, but the configuration of the brake device 10 is not limited to this. Although the direction control valves 5 and 6 are operated by the operation lever 7, other operation members may be used. Although the lever operation is detected by the pressure sensors 12 and 13, the operation detection means is not limited to this. For example, the operation lever 7 may be configured as an electric lever, and the lever operation may be detected by a signal from the electric lever. Although the operation signal v is determined to be normal when the operation signal v is within a predetermined range (v1 ≦ v ≦ v2) (step S1, step S4), the operation signal determination means is not limited to this.

  When the operation signal v is normal, when the hoisting or lowering operation is detected by the pressure sensors 12, 13, the electromagnetic switching valve 11 is switched to release the brake device 10, and when the operation signal v is abnormal, the hoisting or lowering operation is performed. Although the release of the brake device 10 is prohibited even if detected, the configuration of the first brake control means is not limited to this. When the operation signal v is determined to return normally from the abnormality, the release of the brake device 10 is permitted on the condition that the lever is determined to be neutral by the signal from the pressure sensor 15, but at least the operation signal As long as the release of the brake device 10 is allowed on the condition that the drive pressure is not supplied when returning to the normal state, any second brake control means may be used. In the above-described embodiment, the abnormality of the operation signal v for winding and lowering is determined, but an abnormality only for lowering may be determined. Although the abnormality information is notified via the monitor 21, the notification means is not limited to this.

  Although the example applied to the winch apparatus of a crane was demonstrated in the said embodiment, it is applicable similarly to the other winch apparatus which cancels | releases a brake according to the electric signal of an operation system. That is, the present invention is not limited to the winch device according to the embodiment as long as the features and functions of the present invention can be realized.

The hydraulic circuit diagram which shows the structure of the winch apparatus which concerns on embodiment of this invention. The figure which shows the characteristic of the operation signal by operation of an operation lever. The flowchart which shows an example of the process performed with the controller of FIG. The hydraulic circuit diagram explaining operation | movement of the winch apparatus of FIG. The figure explaining the operation | movement at the time of abnormality. The external appearance side view of the crane with which the winch apparatus of FIG. 1 is applied. The figure which shows the modification of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Winch drum 2 Hydraulic motor 5, 6 Direction control valve 7 Operation lever 10 Brake device 12, 13 Pressure sensor 15 Pressure sensor 17, 18 Pressure sensor 20 Controller 21 Monitor

Claims (3)

Winch drum,
A brake device for stopping rotation of the winch drum;
A hydraulic motor that winds and lowers the winch drum with oil discharged from a hydraulic pump;
A directional control valve for controlling the flow of pressure oil from the hydraulic pump to the hydraulic motor;
An operating member for operating the direction control valve;
Operation detecting means for detecting at least a lowering operation of the operating member;
Operation signal determination means for determining whether the lowering operation signal from the operation detection means is normal or abnormal;
A neutral detection means for detecting a neutral operation signal of the operation member directly or indirectly in a system different from the operation detection means,
When the neutral operation signal is not detected by the neutral detection means, it is determined that the drive pressure is supplied so that the drive pressure can be supplied to the hydraulic motor, and when the neutral operation signal is detected by the neutral detection means, State determining means for determining that the driving pressure is not supplied ;
(1) wherein the Makisage operation signal by the operation signal determination unit is determined to be normal, and, Rimaki lowering operation by the operation detecting means to release the brake device to be detected, (2) the operating member When the Makisage operation signal by the operation signal determination means during lowering operation is determined to be abnormal, and operates the pre-Symbol braking device (3) in a state where the lowering operation is maintained, the operation it is determined that the Makisage operation signal is successfully restored from the abnormality by the signal determination unit, and, when it is determined that the a drive pressure supply state, maintaining the operation of the previous SL brake device, (4) the After the neutral operation signal of the operation member is detected in a state where the operation of the brake device is maintained, the lowering operation signal is determined to be normal by the operation signal determination unit, and the operation detection unit performs winding. under Winch apparatus characterized by lower operation and a brake control means for releasing the brake device to be detected. The winch device according to claim 1, wherein
The neutral detection means is a driving pressure detection means for detecting the motor drive pressure,
The winch device , wherein the state determining means determines that the driving pressure is supplied when the driving pressure detecting means detects a driving pressure of a predetermined value or more. The winch device according to claim 1 or 2 ,
When the operation signal determination means determines that the lowering operation signal is abnormal, it further comprises notification means for notifying the abnormality information,
The winch device, wherein the notification means continues to notify abnormality information even if it is determined that the lowering operation signal has returned to normal from abnormality.

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