JP4962096B2 - Hydraulic circuit for deck crane control - Google Patents

Description

  The present invention relates to a hydraulic circuit for controlling a deck crane mounted on a ship.

  As a ship deck crane which is a deck crane mounted on a ship, the one shown in FIGS. 3 and 4 has been proposed.

  That is, the pump unit 2, starter 3, water-cooled oil cooler 4, etc. are arranged inside the fixed post 1 whose upper part protrudes slightly from the upper deck, and the rotating main body 5 swivels on the top of the fixed post 1 via a bearing. It is installed freely. The rotary body 5 is provided with a cab 6 at the top and a machine room 7 at the bottom. The machine room 7 includes a hoisting hydraulic motor 8 and a hoisting drum 9 with a brake, an elevating hydraulic motor 10 and an elevating drum 11 with a brake, a turning unit 13 having a turning hydraulic motor 12, and a hoisting control. The valve 14, the elevation control valve 15, the turning control valve 16, the rotary joint 17 and the like are arranged.

  Accordingly, the operator operates the operating lever in the cab 6 to switch the control valves 14, 15, 16 to operate the hydraulic motors 8, 10, 12, and the hoisting drum 9 lifts and lowers the load 18 and turns the unit. Thus, the cargo handling operation can be performed by appropriately combining the rotation of the rotating body 5 by 13 and the raising and lowering of the boom 19 by the lifting drum 11. 20 is a pump and 21 is an electric motor (for example, refer to Patent Document 1).

  Further, as shown in FIG. 5, as a hydraulic circuit of a marine deck crane, the equipment of the deck crane is arranged separately in the house portion 22 and the crane post 23, and is supplied by a power source sent from a generator 24 provided in the engine room. The electric motor 25 installed in the crane post 23 is driven, the hydraulic pump 26 is rotated by the electric motor 25, the hydraulic motor 28, 29, 30 is driven by going to the house portion 22 via the rotary joint 27 at the connecting portion. In some cases, piping is performed so as to operate the winch drums 31 and 32 and the swivel machine 33 (see, for example, Patent Document 2).

  All of the above are related to single deck cranes, but double deck cranes that have been installed side by side and can be swung up and down at the same time or individually have been proposed. Yes.

  FIG. 6 is a block diagram of the piping. The power supplied from the generator 35 provided in the engine room 34 passes through the crane post, goes to the twin deck box 37 via the slip ring 36, and is provided in the twin deck box 37. The electric motors 38 and 39 are driven, the hydraulic motors 40 and 41 are rotated by the electric motors 38 and 39, and the hydraulic motors 45 and 45 'of the house portions 43 and 44 are respectively connected to the rotary joints 42 and 42'. , 46, 46 ′, 47, 47 ′, and the respective drums 48, 48 ′, 49, 49 ′ and common swirlers 50, 50 ′ are operated (for example, see Patent Document 3).

  By the way, in the case of a double deck crane as shown in the above-mentioned Patent Document 3, the two deck cranes can be synchronized as required, and the operations of raising, lowering, winding and lowering can be simultaneously performed by one operator's operation. There is generally used an electromagnetic proportional pressure reducing valve that performs switching control by adjusting the pressure with an electrical signal in order to remotely control between the cab and the machine room.

  Conventionally, as a control circuit for supplying pressure oil to the electromagnetic proportional pressure reducing valve in the double deck crane, one dedicated control pump 52 is installed in the pump unit 51 as shown in FIG.

  That is, the pump unit 51 includes two hoisting / lowering pumps 53, one hoisting / lifting / turning pump 54, one hoisting / lowering auxiliary (pumping) power pump 55, and the electromagnetic Five pumps including one control pump 52 for supplying pressure oil to the proportional pressure reducing valve 56 are installed and driven by a motor 57.

  A pressure oil supply line 58 as a control circuit is connected to the discharge side of the control pump 52 so that the pressure oil can be supplied to the electromagnetic proportional pressure reducing valve 56. Since the pressure oil sent to the pressure reducing valve 56 needs to be suppressed to a constant pressure, for example, 3.5 MPa, the pressure oil is supplied from the pressure oil supply line 58 when the discharge pressure from the control pump 52 becomes 3.5 MPa or more. A relief valve 59 is provided in the middle of the pressure oil supply line 58 so as to escape. 60 is a pressure oil supply line connected to the discharge side of the hoisting / lowering pump 53, 61 is a lift, pressure oil supply line connected to the discharge side of the turning pump 54, and 62 and 63 are relief valves.

JP 61-086387 A JP 53-071492 A JP-A-53-071493

  However, since the control hydraulic circuit for supplying pressure oil to the electromagnetic proportional pressure reducing valve 56 for the double deck crane shown in FIG. It is necessary to install a pump, and the pump unit 51 cannot be made small, and the number of pumps is large, resulting in an increase in cost.

  Accordingly, the present invention is intended to provide a control hydraulic circuit that can supply pressure oil to the electromagnetic proportional pressure reducing valve by omitting a dedicated control pump.

  In order to solve the above-mentioned problems, the present invention branches a control circuit to an electromagnetic proportional pressure reducing valve to a discharge pressure oil supply line of a power pump as an auxiliary to a hoisting and lowering pump incorporated in a pump unit. And when the hydraulic pressure of the control circuit exceeds a certain value, the control circuit is shut off, and the pressure oil supply line is connected to allow the pressure oil to flow for power. To do.

  More specifically, in the above configuration, the control circuit is provided with a pressure reducing valve that switches when the hydraulic pressure of the control circuit exceeds a certain value and shuts off the control circuit, and for the power The pressure oil supply line on the pump discharge side is shut off at a position downstream from the branch point of the control circuit until the pressure oil supply line exceeds the predetermined value. It is set as the structure which provided the sequence valve which will be in a state and flows pressure oil for motive power.

According to the present invention, the control circuit to the electromagnetic proportional pressure reducing valve is branched and connected to the pressure oil supply line for discharging the power pump as an auxiliary to the hoisting and lowering pump incorporated in the pump unit, and When the hydraulic pressure of the control circuit exceeds a certain value, the control circuit is shut off, and the pressure oil supply line is connected to allow the pressure oil to flow for power. Is provided with a pressure reducing valve in the control circuit so that the control circuit is switched off when the hydraulic pressure of the control circuit exceeds a certain value, and the pressure oil supply line on the discharge side of the power pump is provided. The pressure oil supply line is shut off at a position downstream from the branch point of the control circuit until the pressure oil reaches a certain value or more. With a sequence valve that allows So it is, to exert the following such excellent effect.
(1) Since the pressure oil is distributed for hoisting and control of the electromagnetic proportional pressure reducing valve by using a power pump as an auxiliary for the hoisting / lowering pump, one pump can be used effectively.
(2) According to the above (1), a dedicated control pump can be eliminated, the number of devices can be reduced, and the cost can be reduced.
(3) By reducing the number of pumps, the space for the pump unit can be reduced.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 shows an embodiment of a control hydraulic circuit for a deck crane according to the present invention. Like the one shown in FIG. 2, two hoisting / lowering pumps 53 and one hoisting / lifting / swinging pump are shown. 54 and a pump unit 51 provided with one power pump 55 as an auxiliary to the hoisting pump, a pressure oil supply line serving as a hoisting circuit connected to the discharge side of the power pump 55 In the middle of 64, a control circuit 58 for introducing pressure oil to the electromagnetic proportional pressure reducing valve 56 is connected and branched, and in the middle of the control circuit 58 branched from the pressure oil supply line 64, the downstream pressure is A pressure reducing valve 65 is provided so that the circuit is switched off when the value becomes higher than a certain value. Further, when the pressure on the upstream side of the pressure oil supply line 64 is low at a position downstream of the branch point of the control circuit 58 of the pressure oil supply line 64, the flow path is shut off and the upstream side A sequence valve 66 is provided so that when the pressure becomes higher than a certain value, the flow path is brought into communication and the pressure oil is switched to flow downstream of the pressure oil supply line 64. The sequence valve 66 and the pressure reducing valve are provided. The control valve 67 composed of 65 prevents the pressure of the control circuit 58 from rising more than necessary.

  The sequence valve 66 is set so that the front-rear pressure can be limited to 4.0 MPa, and the pressure reducing valve 65 is set to operate when the pressure of the control circuit 58 exceeds 3.5 MPa. The pressure is reduced so that the pressure of 58 does not rise above 3.5 MPa.

  It is assumed that the power pump 55 can discharge pressure oil reaching a minimum of 4.0 MPa.

  The same components as those shown in FIG. 2 are denoted by the same reference numerals.

  In the control hydraulic circuit for the deck crane of the present invention, a control circuit 58 for the electromagnetic proportional pressure reducing valve 56 is connected to the pressure oil supply line 64 on the discharge side of the power pump 55 for assisting the hoisting and lowering pump 53. Since it is configured, the pressure oil discharged from the power pump 55 can be distributed by the control valve 67 for power for hoisting and for control of the electromagnetic proportional pressure reducing valve 56. That is, when the pressure oil is discharged from the power pump 55 at a pressure such that the sequence valve 66 exceeds a predetermined value of 4.0 MPa, the sequence valve 66 is switched from the shut-off state to the communication state. . As a result, the pressure oil is guided to power through the sequence valve 66 and used for hoisting. On the other hand, the pressure oil discharged from the power pump 55 enters the control circuit 58 branched from the pressure oil supply line 64, passes through the pressure reducing valve 65, and is sent to the electromagnetic proportional pressure reducing valve 56. Become. At this time, when the pressure of the control circuit 58 exceeds 3.5 MPa, the pressure reducing valve 65 is switched from the communication state to the cutoff state by the pressure in the control circuit 58. As a result, the control circuit 58 is shut off by the pressure reducing valve 65, the pressure oil from the power pump 55 is prevented from flowing into the control circuit 58, and a pressure of 3.5 MPa or more acts on the electromagnetic proportional pressure reducing valve 56. This can be prevented.

  The pressure reducing valve 65 keeps the control circuit 58 in a communicating state until the hydraulic pressure passing through the control circuit 58 exceeds 3.5 MPa, and shuts off the control circuit 58 when the hydraulic pressure becomes 3.5 MPa or more. Therefore, the pressure in the control circuit 58 can be maintained at 3.5 MPa.

  The control hydraulic circuit of the present invention is configured such that the pressure oil from the power pump 55 is branched and supplied to the control circuit 58 as described above, so that a dedicated control pump that has been conventionally required is unnecessary. As a result, the cost can be reduced and the space for the pump unit can be reduced.

  The present invention is not limited to the above embodiment. For example, in the above embodiment, the control hydraulic circuit according to the present invention is applied to an electromagnetic proportional control valve in a double deck crane. The present invention is not limited to a double deck crane, but can be similarly applied to a deck crane in which an electromagnetic proportional pressure reducing valve is used for remote control between a cab and a machine room, and various other modifications without departing from the gist of the present invention. Of course, it is possible to add these changes.

It is a figure which shows the outline | summary of the hydraulic circuit for control of the deck crane of this invention. It is a schematic diagram of the hydraulic circuit for control of the conventional double deck crane. It is a perspective view which shows an example of the conventional marine deck crane. FIG. 4 is a hydraulic circuit diagram of the deck crane shown in FIG. 3. It is a piping block diagram of the conventional marine deck crane. It is a piping block diagram of the conventional twin deck crane.

Explanation of symbols

51 Pump Unit 53 Winding Up / Down Pump 54 Lifting / Rotating Pump 55 Power Pump 56 Proportional Pressure Reducing Valve 58 Control Circuit 64 Pressure Oil Supply Line 65 Pressure Reducing Valve 66 Sequence Valve 67 Control Valve

Claims (2)

  A control circuit to an electromagnetic proportional pressure reducing valve is branched and connected to a pressure oil supply line for discharge of a power pump as an auxiliary to a hoisting / lowering pump incorporated in the pump unit, and the hydraulic pressure of the control circuit The control hydraulic pressure for the deck crane has a configuration in which the control circuit is shut off when the pressure exceeds a certain value, and the pressure oil supply line is connected to flow pressure oil for power. circuit.   The control circuit is provided with a pressure reducing valve that switches when the hydraulic pressure of the control circuit exceeds a certain value and shuts off the control circuit, and the control of the pressure oil supply line on the discharge side of the power pump The pressure oil supply line is shut off at a position downstream from the branch point of the circuit for use until the pressure oil reaches a certain value or more. 2. The hydraulic circuit for controlling a deck crane according to claim 1, further comprising a sequence valve for performing the operation.

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