SU1057368A1 - Device for trasfer of loads between ships under rolling conditions - Google Patents

Abstract

DEVICE FOR TRANSFERRING LOADS P: WAIT SHIPS IN THE SEA IN THE CONDITIONS OF KACHKA, containing rope branches, wound up on two traction winches connected to the first and second electric motors of the constant TOKa.jr having the crust, cargo carriage attached to one branch and kinema-. tically connected with another branch, as well as an electronic unit controlling the operation mode of electric motors, including a setter of tension signals, the output of which is connected to the inputs of the adders of the first and second tension regulators, for; a load cell movement signal sensor, with the input of the displacement signal amplifier, a. vy-, the stroke of the latter is connected to the input of the sum; the tension mat and the input of the inverter connected to the input of the adder of the second tension regulator; and three electrical circuits, the first of which are connected The cores of the first and second DC motors contain a current sensor, an adder and a current controller, and a thyristor converter in series, as well as a current indicator connected to the specified adder, and two other electrical circuits are connected to the respective winches and each contain connected tension controller and type-. a resistor transducer connected to the excitation winding of the corresponding electric motor, a tension sensor connected to the corresponding branch of the rope, the output of which is connected to the input of the corresponding totalizer of the tension regulator, and the output of the latter connected to the tension regulator differing from By the fact that, in order to reduce the voltage distortion of the ship's electrical 2-network, the electronic node controlling the operation mode of the electric motors is made with a drive induction motor and rigidly connected with it as a generator PICs direct current, the thyristor converter is reversible and associated with their vy00 swing excitation winding generates a torus-DC and armature upo n m-mentioned generators of posledovatelyo w. connected to the core of the second DC motor and the current sensor input ,.

Description

The invention relates to shipbuilding, in particular, to devices for the transfer of cargo between ships to the sea in pitching conditions. A device for transferring cargo between ships at sea in pitching conditions, containing the branches of a rope, wound on two traction winches, connected to the first and second 4 zaektro DC motors having a core, a cargo trolley attached to one branch and kinematically connected with another branch, as well as an electronic unit controlling the operating mode of electric motors, including a tension signal adjuster, whose output is connected to the inputs of the second and second 1 synchronizers, the reserve signal, the ne | There is a cargo truck, the output of which is connected to the input of the displacement signal amplifier, and the output of the latter is connected to the input of the adder of the first tension regulator and to the input of the inverter connected to the input of the adder of the second tension regulator, and the first circuits connected to the cortex of the first and second electrons of the DC motors and contains a current sensor connected in series, an adder, a current regulator and a thyristor converter, as well as a current setter connected to the specified adder Chains are connected to a corresponding field and each contain a tension controller connected in series and a string converter connected to the excitation winding of the corresponding electric motor, a tension sensor connected to the corresponding branch of the rope, which is connected to the input of the corresponding controller adder tension, and the output of the latter is connected with a tension regulator. A disadvantage of the known devices is the large distortions of the voltage of the ship network made by the powerful tiris ornogo gfeobraeovatel, object of the invention - reduction of voltage distortion ship network RE. The goal is achieved by the fact that in the device for transferring cargo between ships at sea under conditions of a pump, the electronic control unit of the electric motor operation mode is made with a drive asynchronous motor and a DC generator rigidly connected to it, while the converter is reversible and connected its output is connected to the excitation winding of the dc generator, and the core of the aforementioned generator is connected in series with the core of the second dc electric motor and the current sensor input. Fig. 1 shows the kinematic diagram of the device; FIG. 2 is its functional diagram. The device for transferring cargo between the transferring vessel 1 and the receiving vessel 2 contains masts E and 4, between which the branches of the rope 5 are stretched. The load is in the carriage 6 connected to block 7 moving along the upper branch of the rope 5 and rigidly connected with the lower branch of the rope, the loop of which bends around block 8 on mast 4 of receiving vessel 2, and two ends, enveloping blocks 9 and 10 on mast 3 of transmitting vessel 1, are connected to traction winches 11 and 12. Winches 11 and 12 through gears 13 and 14 connected to their electric motors 15 and 16 constant. current, the last The sequence generator connected to the terminals 17 DC rigidly associated with the drive motor 18. The drive winding 19 of the generator 17 is coupled with the output of the low power reversible thyristor converter 20 which with its input z1an communication with the outlet 21 of the regulator current. The adder 22 of the controller 21 is connected by its output to the last input / input and to the output of the current setting device 23. The windings 24 and 25 of the excitation of the electric motors 15 and 16 are connected to low-power thyristor converters 26 and 27, which are connected via inputs Š1 28 and 29 of the tension from the outputs of the adders 30 and 31 of the tension regulators by their inputs. The inputs of the latter, they are connected to the outputs of the setter 32 tension and sensors 33 and 34 nat: Gene connected to the corresponding branches of KatiaTa 5. The output of the setpoint 35 of motion signals is connected through the amplifier 36 to the input of the adder 30 and the input of the inverter 37. The output of the inverter connected to the input of the adder 31 tension regulator. Current sensor 38 is connected to cyNiMaTopy 22. The device operates as follows. In the initial state, the drive asynchronous motor is de-energized, the control signals at the input of the thyristor converters are zero, and the tension of the rope branches is also zero. Dp of the tension setting, a drive asynchronous electric motor 18 is started. After acceleration of the drive motor, a predetermined value of the current in the crank circuit of the electric motors 15 and 16 is set. For this, the current setting device 23 sets

the nominal current setting signal at the input of the adder 22 and then through the re: the throttle 21 of the current at the input of the thyristor converter 20. At the input of the thyristor converter 20, the voltage is applied and in the excitation winding 19 of the generator 17 a current flows, and hence the generator excitation flow is established. Under the action of the magnetic flux at the terminals of the generator 17, a voltage also flows through the voltage circuit and in the electric motor core circuit 15 and 1b. As soon as the current value in the electrical circuit of the electric motors 15 and 16 becomes greater than the specified value, a negative feedback signal is output from the output of the current sensor 38 to the adder 22, reducing the voltage of the thyristor converter 20 and, therefore, the magnetic flux of the generator 17, thereby limiting the amount of current in the electric motor's core circuit by a given value

Then, the setpoint adjuster 32 provides a signal to the inputs: cjWMaTopOB 30 and 31 and then to the inputs of the corresponding tension regulators 28 and 29.

At the outputs of the thyristor converters 26 and 27, a positive voltage appears and the electric motors 15 and 16; begin to rotate in equal directions, choosing the slack of the ropes. As the electric motors operate, the tension on the ropes increases and the signals at the outputs of the tension sensors 33 and 34 increase, which leads to a decrease in the imbalance signals at the inputs of the tension regulators 28 and 29. In the steady state, the electric motors are fixed and develop the same drag force equal to the specified tension.

To set the speed of movement of the load truck, the transfer unit 35 through the amplifier 36 sends a master signal to the input of the adder 30 and inverter 37. At the last output, the signal changes its sign and is fed to the input of the adder 31. Thus, two signals of the same size are fed to the adders 30 and 31 on the opposite polarity. As a result, the total signal at the output of the adder 30 increases, and at the input of the adder 31 decreases. This increases the control signal at the input of converter 26 and decreases the control signal at the input of converter 27. The tension of the rope branch connected to the electric motor 15 increases, and the tension of the rope branch connected to the electric motor 16 decreases. As soon as the force of the branch cable of the electric motor 15 becomes greater than the force of the branch of the electric motor 16 and sufficient to turn the winch of the electric motor 1b towards the side, the trolley 6 will start moving towards the receiving vessel 2. The electric motor 15 continues to work in the motor mode and its speed increases, and the tension of the rope branch associated with it is reduced. At the same time, the electric motor 16 under the action of the traction amplifier of the electric motor 15 starts to rotate in the opposite direction, goes into the generator mode and feeds the crutch circuit of the electric motor 15. The speed of the electric motor 16 will increase, which will lead to an increase in the braking force of the rope branch associated with it. As soon as the electric motors 15 and 16 start to accelerate, the current control loop comes into operation, which increases the voltage of the thyristor converter 20, and hence the magnetic flux of the generator 17, thereby maintaining the current setpoint in the core circuit. Acceleration of electric motors occurs at almost the same set current. The force that causes the movement of the load trolley is equal to the tension difference between the branches of the rope developed by electric motors 15 and 16. The greater the difference, the greater the speed of movement of the load trolley.

As the load carriage moves part of the power of the electric motor 15 returns back to the core circuit by the electric motor 16, the generator, to maintain the set current in the circuit, the magnetic flux of the generator 17, and consequently, the torque on the shaft to the drive shaft decreases. load, reduces power consumption from the network.

The change in direction of movement of the carriage 6 is accomplished by changing the polarity of the signal of the displacement setter. In this case, the electric motor 16 enters the motor mode, and the electric motor 15 is in the generator mode and feeds the rotor circuit of the electric motor 16.

When rolling or diverging ships, the tension of the rope will change. Automatic tension control is performed as follows. When the cargo carriage 6 is moving towards the receiving vessel 2, the electric motor 15 is operated in the engine, full mode and the electric motor 16 is in generator mode. Let ship 1 be stationary, and ship 2 swing. If the latter swings, for example, to the right, then the tension value of the rope branches increases. Simultaneously, the feedback signals of the sensors 33 and 34 increase, which leads to a decrease in the control signals at the inputs of the thyristor converters 26 and 27, due to which yivieHbmaeTCH the voltage of these converters and the magnetic fluxes of the electric motors 15 and 16, and a. consequently, nat) branch of branches {sanat. At the same time, the pitching speed may be such that both electric motors 15 and 16 will be transferred to the generator one. the mode and feedback signal of current sensor 38 will become more modulated. signal; current settings. Then, at the output of the adder 22, Vits negative signal, which through the current regulator will change the polarity of the voltage at the output of the thyristor converter iO. Since the direction of the current in the root: circuit has not changed, generator 17 will go into motion mode and begin to spin up the asynchronous motor 18, turning over waters it this way into generator mode. The latter, the work in the generator mode, recovers the energy of the electric motors 15 and 16 V, the network. In the established mode, the tension of the rope remains almost unchanged and the same amount of tension created by electric motors and rolling. If vessel 2 is left to the left, then the tension on the rope branches will decrease. The system works in such a way that the magnetic fluxes of the engines 15 and 16 will increase and both engines will switch to the motor mode, thus selecting the resulting slack of the branches. - In case of joint rolling of both vessels in the cableway, an algebraic summation of the tensions created by the rolling of the vessel 1 and 2 occurs. Therefore, the system will work out the resulting rolling effect equal to the algebraic sum of the tensions created by the rolling of the vessel 1 and 2.; , ; To stop the load carriage 6, the speed reference signal is reduced to the traffic signal and the signals at the outputs of the summers .30 and 31 become equal. The cart stops and the system maintains a constant tension on the ropes. A device for transferring cargo between ships at sea in pitching conditions ensures minimal distortion of the ship's electrical grid voltage.

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Claims (1)

DEVICE FOR TRANSMISSION OF GOODS BETWEEN VESSELS IN THE SEA IN CONDITIONS OF PUMP, containing rope branches connected to two towing winches connected to the first and second DC motors. directly connected to another branch, as well as an electronic control unit for the operation of electric motors, including a tension signal generator, the output of which is connected to the inputs of the adders of the first and second tension regulators, a cargo truck movement signal generator, the output of which is connected to the input of the movement signal amplifier, a . output, the last stroke is connected to the input of the tension adder and to the inverter input connected to the input of the adder of the second tension regulator, and three electric circuits, the first of which is connected to the anchors of the first and second DC motors and contains a series-connected current sensor, adder and regulator current thyristor converter, as well as a current master connected to the specified adder, and the other two electrical circuits are connected to the respective winches and each contain p gulyator five- and tension. a transistor converter connected to the excitation winding of the corresponding electric motor, a tension sensor connected to the corresponding branch of the rope, the output of which is connected to the input of the corresponding adder of the tension regulator, and the output of the latter is connected to the tension regulator, which differs in that, in order to reduce the voltage distortion of the ship electric networks, electronic control unit for the operation of electric motors is made with a drive induction motor and a DC generator rigidly connected to it , The thyristor converter is reversible and its output connected to the excitation winding DC generator, and the armature of said generator posledovatelyo .soedinen with the armature of the second motor and the input of the DC current sensor. , § eo