JP6805087B2 - Flood control system of hydraulic bucket - Google Patents

Description

The present invention relates to a hydraulic control system for a hydraulic bucket to be attached to a crane for cargo handling.

Conventionally, for example, in a waste crane used for a waste incineration facility, a crane with a hydraulic bucket in which a hydraulic bucket is attached to the crane has been widely used.

A cable that combines a power line that supplies power to the motor for driving the hydraulic pump and a control line that switches the on / off and oil flow directions of the hydraulic circuit to open and close the bucket is connected to this hydraulic bucket. Has been done.

Since the hydraulic bucket is suspended by a crane in the air, in order to supply power to the hydraulic bucket, a power supply cable is hung from the crane, and the power supply cable is wound by a cable reel to perform tension.

Since the power supply cable of the conventional hydraulic bucket is a multi-core thick and heavy cable that combines the power line and the control line, the cable reel that winds up the power supply cable also becomes large, and it is necessary to install the cable reel on the crane. A large space was needed.

In the present invention, the cable reel is made smaller by reducing the number of core wires of the cable that supplies power to the hydraulic bucket, the installation space on the narrow crane is effectively utilized, and the moving range of the crane is reduced by reducing the crane size. The purpose is to make it wider and make effective use of the building.

In order to achieve the above object, the hydraulic control system for the hydraulic bucket of the present invention rotates the hydraulic pump drive motor in the forward or reverse direction and starts or stops in conjunction with the opening command or the closing command of the hydraulic bucket from the controller or the computer. The reversible pump that can flow the oil flow in both directions is driven according to the rotation direction of the motor, and the bucket is opened or closed by switching the oil flow direction, and the hydraulic pump is pushed in. It is determined that the open end or the closed end has been reached by increasing the pressure to a preset specified pressure, and the actuator that drives the discharge amount adjusting mechanism of the hydraulic pump is driven by using the upper boost to the specified pressure. The actuator drive hydraulic pressure, which keeps the pump discharge amount suppressed and has a mechanism to automatically stop the bucket at the open end or the closed end, and keeps the open end or the closed end automatic stop state, is a controller. Alternatively, when the open command or close command from the computer is cut, the electromagnetic valve connected in parallel to the hydraulic pump drive motor is cut, and the hydraulic circuit that drives and holds the actuator is switched to release the pressure to open the end. Alternatively, it is characterized in that the closed end state is released and the restart operation can be accepted by releasing the open end or closed end state.
The hydraulic control system of this hydraulic bucket uses a reversible pump that switches the oil flow direction in the rotation direction of the hydraulic pump drive motor, and opens or closes only by turning the motor on / off or switching the phase order. When the operation and stop are performed and the open end or the closed end is reached, it is assumed that the open end or the closed end is reached by the pressure increase of the hydraulic circuit, and the discharge amount of the reversible variable discharge amount type hydraulic pump is narrowed down by the pressure increase. By driving and holding the actuator and holding the state in which the discharge amount of the pump is narrowed down, the open end and the closed end are automatically stopped. Furthermore, to maintain the automatic stop of the open and closed ends, the hydraulic pump can be re-discharged by releasing the oil holding the actuator with a solenoid valve connected in parallel with the power supply of the hydraulic pump drive motor. It enables restart by resetting the automatic stop state of open end and closed end.
This series of bucket opening, closing operation and opening, automatic stop and automatic stop reset of the closed end can be realized only by turning on and off the power line of the hydraulic pump drive motor and changing the phase order of the power line. That is, a bucket drive hydraulic circuit is realized with only a power line and no control line.

According to the hydraulic control system of the hydraulic bucket of the present invention, the number of power supplies to the hydraulic bucket is reduced, and the multi-core power supply cable becomes a thin and light cable, so that the cable reel on the crane becomes small and the equipment cost becomes low. In addition, the smaller cable reel makes the crane smaller, and the closer the crane is, the wider the range of movement, which is effective in terms of crane operation.

It is an overall block diagram which shows one Example of the hydraulic control system of the hydraulic bucket of this invention. It is an electric circuit diagram which shows an Example of the hydraulic control system of the hydraulic bucket of this invention. It is a hydraulic circuit diagram which shows an Example of the hydraulic control system of the hydraulic bucket of this invention.

Hereinafter, embodiments of the hydraulic control system for the hydraulic bucket of the present invention will be described with reference to the drawings.

For example, a garbage crane or the like is used in the form shown in FIG. 1 in a cleaning factory or the like.
The hydraulic bucket GB for grasping the load is suspended by a wire rope WR from the hoisting device HM on the crane CR and is in a suspended state.

By the way, in the hydraulic control system of this hydraulic bucket, the closing electromagnetic contactor CX that opens and closes the three-phase AC power supply PW in the positive phase order in response to the opening operation O or closing operation C from the controller CL or the computer, or vice versa. By opening and closing the opening electromagnetic contactor OX connected in phase order, the power supply that has been turned on / off or switched in phase order is supplied by the bucket power supply line GL, and the bucket power supply line (cable) is supplied via the cable reel CRe. Reel take-up cable) The CA supplies power to the suspended hydraulic bucket GB.
At this time, the feed line GL and the feeder line CA that are fed to the hydraulic bucket GB do not include the control line and are only three of the three-phase power supply lines.

The power supplied to the hydraulic bucket GB is connected in parallel to the hydraulic pump drive motor M and the open-end / closed-end reset solenoid valve SV inside the hydraulic bucket GB.
At this time, the hydraulic pump drive motor rotates forward or reverse in conjunction with the opening / closing signal from the controller CL or the computer, and the solenoid valve SV for opening / closing reset is turned ON / OFF in conjunction with the opening / closing signal.

When the hydraulic pump drive motor M is operated in the closing direction and rotates in the forward rotation direction, it is sucked up from the oil tank OT to the reversible variable discharge amount type hydraulic pump RP through the route a via the suction filter SF and the check valve CH. The oil is pushed into the head side HD of the hydraulic cylinder CY through the route a.
At this time, the pilot of the check valve (for closing return circuit) PCa with a pilot is opened by the pressure applied to the route a, and the oil discharged from the rod side RD of the hydraulic cylinder CY is piloted through the throttle valve TR. Check valve (for closing return circuit) PCa returns to the oil tank OT via the return filter RF.
By this series of operations, the hydraulic cylinder CY is moved in the closing direction CF, and the hydraulic bucket GB closes.

Due to the pressure rise of the a-line, pressure is applied to the opening / closing end detection sequence valve SQ from the a-line side via the shuttle valve SH. However, when the bucket reaches the closed end due to the bucket closing operation, the a-line The pressure rises significantly, and the preset open / close end detection sequence valve operates at a position slightly lower than the pressure rise value at that time, and when the closed end / open end is detected, oil flows in the hydraulic direction e and the open end / closed end reset solenoid valve is used. Oil flows into the valve SV. At this time, the solenoid valve SV for resetting the open end and the closed end is in a state of being energized in conjunction with the motor M for driving the hydraulic pump, and the flow e of the hydraulic pressure from the sequence valve SQ for detecting the open end is transferred to the actuator VA for changing the pump discharge capacity. Lead to. The pump discharge capacity variable actuator VA operates due to the pressure of the oil e, and in response to this, the discharge amount of the reversible variable discharge amount type hydraulic pump RP is throttled, and the oil flow is stopped in the bucket closed state.
Since the pressure of the oil e operating the pump discharge capacity variable actuator VA has no escape, the closing command from the controller CL or the computer is continued, and the hydraulic pump drive motor M continuously rotates. In this state, the pressure of the oil e is maintained, and the discharge amount of the reversible variable discharge amount type hydraulic pump RP is maintained in a reduced state. That is, the closed state is maintained.

At this time, when the closing operation from the controller CL or the computer is cut off, the power supply to the hydraulic pump drive motor M and the open end closing reset solenoid valve SV is cut off.
When the solenoid valve SV for resetting the open end and the closed end is cut off, the oil e that pushes and holds the actuator VA for changing the discharge capacity of the pump is switched to the oil flow direction r at the time of resetting the open end and closed and is discharged to the oil tank OT, and the pump is discharged. When the discharge capacity variable actuator VA returns to the original position, the pump RP returns to the discharge enable state, and the closed end holding state is reset.

On the other hand, when the controller CL or the computer is operated in the direction of the opening operation O, the power supply in the opposite phase is supplied to the bucket from the opening electromagnetic contactor OX, and the hydraulic pump drive motor M is rotated in the reverse direction to be reversible. The variable discharge amount type hydraulic pump RP is driven in the opposite direction. As a result, oil is sucked up from the oil tank OT to the reversible variable discharge amount type hydraulic pump RP through the oil flow direction b line during open operation, and passes through the oil flow direction b line during open operation to the rod side of the hydraulic cylinder CY. Oil is pushed into.
At this time, the pilot of the check valve with pilot (for the return circuit when opened) PCb opens under the pressure of the b line, and the oil discharged from the head side HD of the hydraulic cylinder CY passes through the PCb and passes through the return filter RF. It is returned to the oil tank OT through the b line.
By this series of operations, the hydraulic cylinder CY is moved in the opening direction OF, and the hydraulic bucket GB is opened.

At this time, since pressure is applied to the b line, pressure is applied to the sequence valve SQ for detecting the open / close end from the b line side via the shuttle valve SH, and the bucket opens / closes in response to the pressure rise when the bucket reaches the open end. The sequence valve SQ for end detection operates, the sequence valve opens, and the hydraulic pressure e is applied to the actuator VA for variable pump discharge capacity via the solenoid valve SV for resetting the open end and the closed end in the ON state, and the hydraulic pressure e is applied when the closed end is detected. The discharge amount of the discharge amount type hydraulic pump RP is throttled, and the oil flow stops when the bucket is open.
The closed-end open-end detection oil pressure e, which throttles the discharge amount of the reversible variable discharge amount hydraulic pump RP, cuts off the power supply to the bucket when the open command from the controller CL or the computer is cut off, and the open-end closed-end reset solenoid. When the valve SV is cut off, the discharge amount of the reversible variable discharge amount type hydraulic pump RP is throttled, but the oil pressure e is switched to the oil flow direction r when the closed end is detected and the open end is reset, and the pump RP is discharged. It returns to the possible state and the open end holding state is reset.

A safety valve RE is provided on each of the a-line and b-line to protect the equipment from damage due to an abnormal rise in pressure.

The hydraulic control system for the hydraulic bucket of the present invention has been described above based on the embodiment thereof, but the present invention is not limited to the configuration described in the above embodiment and is appropriately used as long as the purpose is not deviated. The configuration can be changed.

According to the hydraulic control system of the hydraulic bucket of the present invention, the number of core wires of the cable for supplying power to the bucket can be reduced, the cable reel can be made smaller, the installation space on the narrow crane can be effectively utilized, and the crane size can be reduced. Due to the miniaturization, the range of movement of the bucket can be widened and the building can be effectively used, and the possibility of industrial use is great.

PW three-phase AC power supply CL controller C Closing operation O Opening operation CX Closing electromagnetic contactor OX Opening electromagnetic contactor GL Feed line for bucket Cre cable reel CA Feed line for bucket (cable reel take-up cable)
GB Hydraulic bucket CR crane HM hoisting device WR Wire rope M Hydraulic pump drive motor SV Solenoid valve for open end closed end reset RP Reversible variable discharge amount type hydraulic pump CH check valve SH shuttle valve PCa Check valve with pilot (when closed) For return circuit)
Check valve with PCb pilot (for return circuit when opened)
SQ Sequence valve for detecting open / close end VA Pump Actuator for variable discharge capacity RE Safety valve TR Squeeze valve OT Oil tank SF Suction filter RF Return filter CY Hydraulic cylinder HD Hydraulic cylinder head side RD Hydraulic cylinder rod side CF Bucket closing direction OF Bucket opening Direction a Oil flow direction during closed operation b Oil flow direction during open operation e Hydraulic direction when closed end open end is detected r Oil flow direction when open end closed end is reset

Claims (1)

The hydraulic pump drive motor is rotated forward or reverse and started or stopped in conjunction with an open or close command of the hydraulic bucket from the controller or computer, and the oil flow is bidirectional depending on the rotation direction of the motor. By driving a reversible pump that can operate and switching the oil flow direction, the bucket is opened or closed, and the pushing pressure of the hydraulic pump rises to a preset specified pressure to open or close the end. When it is determined that the pump has reached the specified pressure, the actuator that drives the discharge amount adjusting mechanism of the hydraulic pump is driven by using the upper boost to the specified pressure, the discharge amount of the pump is maintained in a suppressed state, and the bucket is opened or opened. The actuator drive hydraulic pressure, which has a mechanism for automatically stopping the closed end and continues to maintain the open end or closed end automatic stop state, is driven by a hydraulic pump when an open command or a close command is issued from the controller or computer. When the electromagnetic valve connected in parallel with the motor is cut off, the hydraulic circuit that drives and holds the actuator is switched to release the pressure, and the open end or closed state is released. A hydraulic control system for hydraulic buckets, which is characterized by being able to accept operations.

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