JPS6124318B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for maintaining a constant rope length in a hydraulic winch for a marine vessel such as a hydraulic trawl winch, a hydraulic mooring winch, or a hydraulic towing winch.

With these conventional winches, the winch drum is fixed with a mechanical brake or tension is controlled at a constant level when the winch drum is towed on a trawler, or when towed or moored on a work boat, but when the winch drum is fixed, When abnormal tension is applied to the rope wound around the winch drum, this tension cannot be absorbed, causing wear and damage to the rope. In addition, in the case of constant tension control, the winch continues to unwind when the wire rope tension exceeds the set value, and continues to reel in when the wire rope tension falls below the set value, so it has the disadvantage that adjustments must be made throughout the process. be.

The present invention eliminates these drawbacks of the prior art and
This was made to provide a position control device that has both automatic tension control and position holding functions. The present invention will be explained in detail below with reference to the accompanying drawings. FIG. 1 is a hydraulic circuit diagram showing one embodiment of the present invention. A
1 and A2 are pump units having the same rating, each consisting of a motor 1, a pump 2, a relief valve 3, and a check valve 4, and the suction side of the pump 2 is connected through an oil passage 5. B1 and B2 are hydraulic trawl winches operated by pressure oil from pump units A1 and A2, respectively, and each winch is connected to an oil path switching control valve 6, a hydraulic motor 8, and the hydraulic motor 8, respectively. It consists of a winch drum 9 and a relief valve 10 that prevents the pressure inside the hydraulic motor 8 from rising excessively. Reference numeral 11 denotes a relief valve provided to commonly control the pilot pressure of the relief valves 10, 10. A rope 12 is wound around the winch drum 9 and connected to a trawl net 13. Reference numeral 15 denotes an oil passage that connects the holding pressure side ports 14 and 14 of the hydraulic motor 8 to equalize the tension of the ropes wound around both winch drums, and this oil passage is closed when each winch is controlled independently. A stop valve 16 is provided. In addition,
The reason why the boat 14 side of the hydraulic motor 8 is referred to as the holding pressure side is because the tension applied to the rope 12 is applied to the winch drum 9 regardless of the state of the control valve 6. This is because there is a force trying to turn it. 17 is an expansion tank.

The pilot pressure of the relief valve 11 is controlled by the following configuration. The pilot pressure of this relief valve 11 is generated by a constant pressure generating device consisting of a pump 20, a relief valve 21, and a throttle valve 22, and an electromagnetic proportional valve 23 is provided on the output side of the throttle valve 22 to control the pilot pressure. It is being

This electromagnetic proportional valve 23 is controlled by an output signal of an amplifier 26 that amplifies a deviation signal between a setting signal of a position setting device 24 and a position signal 25 described below.

For example, in order to detect the rope length l shown in FIG. 2 to control the length of the rope 12, a length detector 30 such as a pulse signal generator or analog signal generator is installed on the axis of the winch drum 9. Alternatively, the rope 12 may be provided with a friction wheel type rotator. In addition, in order to control the depth of the trawl net as shown in Figure 3,
A water depth detector 31 is provided on the trawl net 13, which is an object to be controlled, to detect a height H ₁ from the seabed or a depth H ₂ from the water surface.

33 is an amplifier that amplifies the detection signal of the length detector 30, 34 is an amplifier that amplifies the output signal of the water depth detector 31 sent via the cable 32, and the rope length l and the water depth of the trawl net are Since they are not required at the same time, one of the signals is selected by the switch 35 and sent to the amplifier 26. Note that 36 in FIGS. 2 and 3 is an otter board for trolls.

In this configuration, the control valve 6 is
The direction of rotation of the winch drum 9 is determined, and during fishing, the left and right control valves 6, 6 are switched from the illustrated state to the directions A and B, respectively, and the pressure oil from the pump units A1 and A2 is transferred to the winches B1 and B2, respectively. The pressure is supplied to the hydraulic motor 8 from the holding pressure side boat 14 of the hydraulic motor 8 . A pressure is generated in the hydraulic motor 8 according to the tension generated in the rope 12 due to the resistance generated by the trawl net 13 and seawater. When this pressure exceeds a predetermined pressure, pressure oil flows into the relief valve 10 to prevent excessive pressure rise, but the pilot pressure of this relief valve 10 is set by the relief valve 11, and the pilot pressure of this relief valve is controlled by a solenoid proportional valve 23.

For example, when the length of the rope is longer than the length set by the setting device 24, when the difference between the signal 25 and the setting signal becomes large, the output of the amplifier 26 increases, and the electromagnetic proportional valve 23 is operated in the closing direction. This also increases the pilot pressure in the relief valve 11, which increases the pilot pressure in the relief valves 10, 10, so that the pressure in the port 14 is higher than the rope tension, and the rope 12 is pulled into the winch drums 9, 9.
It is wound up. On the other hand, when the rope length is shorter than the set length, the pilot pressure of the relief valve 10 decreases and the winch drum 9 is unwound by the tension of the rope 12. If the depth of the trawl net is to be kept constant, the switch 35 is switched from the state shown, the feedback signal from the water depth detector 31 is input to the amplifier 26, and the same control as the rope length described above is performed.

Although the relief valve 11 is provided because the relief valve 10 and the electromagnetic proportional valve 23 have different capacities, hydraulic oils, etc., the relief valve 11 and the electromagnetic proportional valve 23 can be directly connected in principle.

According to the configuration of the present invention described above, by absorbing the transient tension of the rope 12, it is possible to prevent the rope from being worn out and damaged, and to maintain the rope continuously at a fixed position. The effort required to adjust the depth and maintain a constant depth is significantly reduced.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing an embodiment of a constant position holding device for a hydraulic trawl winch according to the present invention, Fig. 2 is an explanatory diagram showing a state in which the device is used for rope length control, and Fig. 3 FIG. 2 is an explanatory diagram showing a state in which the device is used for depth control. A1, A2...pump unit, B1, B2...
... Hydraulic trawl winch, 6 ... Control valve, 8 ... Hydraulic motor, 9 ... Winch drum, 10, 11 ... Relief valve, 12 ... Rope, 13 ... Trawl net, 23 ... Solenoid proportional valve,
24...Position setting device, 26, 33, 34...Amplifier, 30...Rope length detector, 31...Water depth detector.

Claims (1)

[Claims] 1. Consisting of a pump unit and a hydraulic winch operated by pressure oil from the pump unit, the winch includes a winch drum for winding a rope for seine fishing, towing, etc., and the winch A hydraulic winch for ships having a hydraulic motor that rotates a drum and a relief valve that prevents an excessive pressure rise on the holding pressure side in the hydraulic motor, a relief valve that controls pilot pressure of the relief valve; An electromagnetic proportional valve that controls the pilot pressure of the relief valve, a position setting device that sets the position of a controlled object connected to the rope, a position detector that detects the position of the controlled object, and a position detector that detects the position of the controlled object. and an amplifier that amplifies a deviation signal between the detection signal and the setting signal from the position setting device to generate an operation signal for the electromagnetic proportional valve, and the tension of the rope is controlled according to the deviation signal, thereby controlling the winch. A fixed position holding device for a marine hydraulic winch, characterized in that a drum is held in a fixed position. 2. In claim 1, the position detector is a length detector that detects a rope length, and the output signal of the detector is amplified by an amplifier to generate the electromagnetic proportional valve operation signal. 1. A constant position holding device for a hydraulic winch for a marine vessel, characterized in that the device is configured to send out a feedback signal as a feedback signal. 3. In claim 1, the position detector is a detector installed on the controlled object to detect the depth or height of the controlled object, and the output signal of the detector is 1. A fixed position holding device for a hydraulic winch for a ship, characterized in that the device is configured to amplify it with an amplifier and send it as a feedback signal to an amplifier that creates the electromagnetic proportional valve operation signal.