Device drive control of the executive body of the front of the unit

 

The invention relates to the mining industry and can be used in the system of automatic control and drive control of the Executive body of the front of the unit. The objective of the invention is to increase the productivity front of the unit. The device includes two asynchronous electric motor connected through a gear drive sprocket endless conveyor chain equipped strahovymi carriages can be moved along the guide, and contains two frequency Converter, two frequency controller, the block load balancing, including the adder, two comparator, the first and second keys, the unit selection module signal and the regulator load balancing. The device is equipped with a regulator load unit job load, a control block, the block signal initial setup, the hydraulic cylinders move the rail on the bottom, the valves control the hydraulic cylinders move, electro-hydraulic units, including volumetric dosing, two two-position valve with four electromagnets control. 1 Il.

The invention relates to the mining industry, and property named is the regulation and control electrohydroblock Executive body of the front of the unit.

A device drive control of the Shearer /Serov Century. And., Babakin, I., Kolesnikov E. B. control System of the frequency-adjustable electric drive Shearer. Izvestiya vuzov. Mining magazine, 1992, 6, S. 93-96. / that contains the load cell asynchronous unregulated motor of the Executive body, the frequency Converter, the controller of the load, the power setting signal. The input of the frequency Converter is connected to the network, and the output is connected to the stator winding of the motor feeder. The load sensor is connected to the input of the motor of the Executive body and its output connected to the controller load, the output of which is connected with the second input of the frequency Converter. The output unit set signal is connected to the second input of the regulator load.

A disadvantage of the known device is that when adjusting the feedrate and constant cutting speed varies chip thickness, and the step of cutting the distance between adjacent lines of cut remains unchanged. Therefore, the step of cutting to the thickness of the chip when adjusting the feeding speed is changed in a wide range, and the lowest energy costs are provided only when opecial maintain the minimum specific energy consumption for the separation of coal from array which leads to the lowering of the potential performance of the Shearer.

Closest to the present invention is a control device double electric supply of the Executive body of the Shearer placed on the guides, with the possibility of translational movement by means of endless conveyor chain /Babakin, I., Shytsky Century. And., Serov Century. And. Frequency-adjustable electric drive mining machines and installations. M.: Publishing center of MUCTR, 1998, S. 145-146, Fig. 5.5/. The drive contains two asynchronous electric motor, the rotors of which through the gears and sprockets are connected with a traction chain, with the possibility of moving the Executive body of the guide.

The device includes first and second frequency converters, frequency regulators, gauges, load block load balancing of the first and second motors, a unit of frequency of rotation. Block load balancing includes the adder, the first and second Comparators, the first and second keys, the unit selection module signal controller load balancing. The inputs of the inverters connected to the power network, and outputs respectively to the stator windings of the first and second motors. To the outputs of the adder unit balancing. The output of the adder is connected to the first and second Comparators and the outputs of the latter are connected with inputs respectively of the first and second keys. The outputs of these switches are connected to two inputs of frequency regulators. With the output of the adder is connected to the block selection module signal, the output of which is connected with the regulator load balancing. The yield of the latter is connected to the inputs of the keys.

The output of block frequency associated with the frequency regulators.

When load balancing two asynchronous electric motors increases the installed capacity utilization of the Shearer.

The disadvantage of this device, like the previous one, is that when changing the feed speed of the Executive body of the guide and constant surface speed change ratio of the step of cutting the chip thickness, which leads to an increase in the specific energy consumption for the separation of coal from the array. In addition, the device does not exclude the possibility of increasing the resistance to the motion of the Executive body of the guide due to its bending in the plane of the layer and the associated additional costs of energy.

The task of the invention is to increase the productivity front of the unit for sdelanii coal from the array, as well as the cost of energy during the motion of the Executive body of the guide.

The problem is solved so that the device drive control of the Executive body of the front of the unit, including two asynchronous electric motor connected through a gear drive sprocket endless conveyor chain equipped strahovymi carriages can be moved along the guide containing the first and second inverters whose inputs are connected with an electric circuit, and outputs associated with the stator winding, respectively, the first and second motors, first and second control frequency, the outputs of which are connected to control inputs respectively of the first and second frequency converters, load cells, connected to the outputs of the first and second frequency converters, block load balancing, including the adder, the first and second Comparators, the first and second keys, the unit selection module signal controller load balancing, and an adder connected to the outputs of the load sensors, the output of the adder is connected to the inputs of the first and second Comparators and unit selection module signal, the outputs of the Comparators are connected the first frequency controller, the output of the block selection module signal connected to the input of the regulator load balancing, the output of which is connected to the inputs of the first and second keys, inputs of controller workload, the unit job load, the control unit, the block signal initial setup, the cylinders move the rail on the bottom, the valves control the hydraulic cylinders move, electro-hydraulic units, including volumetric dosing, the first and second on-off valves respectively with the first and second, third and fourth electromagnets control.

The block task load is connected to the input of the regulator load, a second input connected to the load cell of the second motor, the controller output load connected to the first inputs of the first and second frequency regulators. The inputs of each valve and control cylinder move the guideline connected with pressure and drain hydrologically, the first and second outputs of the distributor control is connected with the piston and rod cavities of the cylinders, the third and fourth outputs it is connected with the first and second inputs of the first and second two-position valves, and their first what about the block. The first control unit is connected with the output of the second frequency Converter, the second input is connected to the block signal initial setup, and the first, second, third and fourth outputs of the control unit are connected respectively with the first and second, third and fourth electromagnets control on-off valves electro-hydraulic units.

The essence of this invention is illustrated in the drawing, which shows a diagram of a device for controlling the drive of the Executive body of the front of the unit.

Drive Executive body front Assembly includes first and second asynchronous motors 1 and 2 are connected through gears 3 and 4 are driven by the sprockets 5 and 6, an endless traction chain 7, include, for example, strahovymi the carriage 8 can be moved along the guide 9.

Device drive control of the Executive body includes first and second inverters 10 and 11, the inputs of which are connected with an electric power network, and the outputs respectively from the windings of the stator of the first and second motors 1 and 2.

The frequency converters 10 and 11 are connected to control outputs of frequency regulators 12 and 13. To the outputs of the converters are the key 16, the inlet of which is connected with the unit set the load 17. The controller output load 16 connected to the first input of frequency regulators 12 and 13.

Block load balancing 18 includes an adder 19, the first and second Comparators 20 and 21, the first and second keys 22 and 23, block allocation module signal 24, the controller load balancing 25. The outputs of the load sensors 14 and 15 is connected to the adder 19, the output of which is connected to the Comparators 20 and 21, and the outputs of the latter are connected with inputs respectively of the keys 22 and 23. The outputs of the keys 22 and 23 are connected respectively with the third and second inputs of the controllers frequency 12. With the output of the adder 19 is connected to the block selection module signal 24, the output of which is connected with the controller loads 25. Input of the latter is connected to the inputs of the keys 22 and 23.

The cylinders 26 move a guide 9 on the bottom associated with each section of this guide (in the scheme conditionally showing 1 cylinder). Piston and the rod end of each hydraulic cylinder 26 is connected with the first and second outputs of the valve control 27, the inputs of which are connected to the pump 28 and the drain 29 hydrologically.

Electro-hydraulic unit 30 includes first and second two-position valves 31 and 32 to control the 37. The third and fourth outputs of the valve 27 associated with the first and second inputs of a bistable valves 31 and 32 of each of the electrohydraulic unit 30, and first and second outputs are connected to opposite cavities volumetric dispenser 37.

The control unit 38 is connected to the output of the frequency Converter 11, the second input is connected to the block signal initial setup 39. The first, second, third and fourth outputs of the control unit 38 are connected respectively to the solenoids 33, 34, 35 and 36 of each of the electrohydraulic unit 30.

Device drive control of the Executive body of the front of the unit works as follows.

In steady state operation the moving speed of the Executive authority in the form of, for example, plow carriage 8 along the face (cutting speed) along the guide 9 by means of endless conveyor chain 7 is determined by the speed of asynchronous motors 1 and 2 with squirrel-cage rotors, gear ratio of the gears 3 and 4, and the radius of the drive sprockets 5 and 6. The rotational speed of the motor is determined in turn by the frequency of the alternating current supplied to the windings of these motors from conversions is s hydraulic cylinders 26 and depends on the volume of the working fluid arriving per unit time in the piston cavity of each cylinder from the pressure supply lines 28 through the control valve 27 mounted in position A. When this rod cylinder chamber 26 through the control valve 27 is connected, and the first inputs of a bistable valves 31 and 32 of each of the hydraulic unit 30.

The control unit 38 generates a rectangular control pulses, the frequency of which is determined by the frequency of the alternating current output of the frequency Converter 11 and in a certain sequence distributes them through communication lines with electro-hydraulic units 30. When applying control pulses to the electromagnets 33 and 36, the valve 31 is installed in the right position, and the valve 32 in the left position. Thus the working fluid from the rod end of the hydraulic cylinder 26 enters the right atrium of the volumetric dosing device 37, the piston of which moves to the left, and the hydraulic cylinder 26 merges into hydrological 29 volume of the working fluid equal to the volume of the dispenser 37. Under the pressure of the working fluid supplied to the piston cylinder cavity 26 through the first outlet valve 27, the piston rod of the hydraulic cylinder 26 moves gidroraspredeliteli 31 is switched to the left position, and the valve 32 in the right position. The working fluid from the rod end of the hydraulic cylinder 26 is supplied into the left cavity volumetric dosing unit 37, and the right cavity of the working fluid is displaced into the drain hydrological 29. As a result, the piston rod of the hydraulic cylinder 26 is again moved together with the guide rail 9 on the bottom. With the following managing tact again included the electromagnets 33 and 36 and so on, Therefore, the nomination of all cylinders 26 is synchronous and the feed speed of the guide 9 on the bottom is determined by the repetition frequency of the control pulses.

If, for example, increasing the hardness of coal, the actual current of the motor 2, as measured by the load sensor 15 exceeds specified, then the output of the regulator load 16 will receive a signal dependent on the difference between the value of the current supplied from the block task load 17, and the actual current value of the motor 2. This signal is applied to the first input of frequency regulators 12 and 13, which affect the frequency converters 10 and 11. The latter reduce the frequency of alternating current supplied to the motors 1 and 2, which reduces the speed of these motors, gears 3 and 4, the drive zvezdochkayasna by reducing the frequency of the alternating current output of the frequency Converter 11, the reduced frequency of the control pulses at the output of the control unit 38 and proportionally reduced movement speed (feed rate) of the cylinders 26 and the guide rail 9 on the bottom. In the proportional reduction of the cutting speed and feed rate chip thickness remains almost constant, so the ratio of the step of cutting the chip thickness also remains unchanged. However, by reducing the cutting speed is lower power motors 1 and 2 and consumed current up to the specified level.

In the case of reducing the actual current consumed by the motor 2, for example by reducing the hardness of coal, the regulator load 16 with the help of frequency regulators 12 and 13, and frequency converters 10 and 11 provides an increase in the frequency of rotation of the motors 1 and 2 and the cutting speed, as well as a proportional increase in the speed of the feed rail 9 on the bottom. As a result the load of the motor increases and stabilizes at a given level, and the step of cutting the chip thickness is maintained.

Due to the uneven hardness of coal in the upper and lower packages coal seam resistance to movement of the lower and upper branches of the traction chain 7 with strahovymi carriages 8 may be different, and the load (current) motor 1 will be different from the load (current) motor 2 in a higher or lower the Ohm load 14, the output of adder 19 block load balancing 18 you receive a positive signal with the sign "+", which leads to the triggering of the comparator 20 and the key 22. The signal of the error current, equal to the difference between currents of the motors 2 and 1, from the output of the block selection module signal 24 is supplied to the controller load balancing 25. The output signal from the controller load balancing 25 through public key 22 is supplied to the third input of the frequency regulator 12 with the sign "+", which leads to an increase in the frequency power of the motor 1 as long as the currents of the motors 1 and 2 will be compared.

When the excess current of the motor 1 DC motor 2 to the output of the adder 19 is a negative signal is negative, which leads to the triggering of the comparator 21 and the key 23. The output signal from the controller load balancing 25 through public key 23 is supplied to the second input of the inverter 12 is negative, which leads to the reduction of the power of the motor 1 and to reduce the current consumed them, to the value of the motor current 2.

If you want simultaneously to turn off the flow guide 9 on the bottom, then at block 39 signal setup signal, which output b the ski unit 30. The valves 31 and 32 are switched to the right position, draining the working fluid from the rod ends of the cylinders 26 in the drain hydrological 29 is stopped and the piston stop.

To enable the feed rail 9 of the Executive body on the bottom stop signal from the block 39 and the control unit 38 begins to produce control pulses to activate the electromagnets 33, 34, 35 and 36 in the above sequence.

With long breaks in operation the valves 27 are set in a neutral position C. When the switching valves 27 in position D and is switched on and the reversal of hydraulic cylinders 26. For example, for periodically removing accumulated during operation of the front Assembly errors in the straightness of the guide 9 in the plane of the layer.

Thus, the proposed introduction of additional blocks in combination with the change and the introduction of additional connections between the blocks of the device drive control of the Executive body of the front of the unit allows you to adjust in automatic mode as the feed speed of the Executive body on the bottom, and the speed of its movement along the guide (revise the data of energy consumption for the separation of coal from the array when you change the mode of operation of the Executive body. In addition, due to the presence in each of the electrohydraulic unit volume of the dispenser is provided to synchronize the speeds of the feeding guide on the bottom of each cylinder travel guide and automatic maintenance of its linearity in the plane of the layer. This reduces the resistance to movement of the Executive body of the guide and a reduced specific energy consumptions. At the same time stabilizes the load of the electric motor drive of the Executive body at a given level. In the result of the joint effect of these factors improves the performance of the front of the unit.

Claims

Device drive control of the Executive body of the front of the unit, including two asynchronous electric motor connected through a gear drive sprocket endless conveyor chain equipped strahovymi carriages can be moved along the guide containing the first and second inverters whose inputs are connected to an electric power network, and the outputs are associated with the stator winding, respectively, the first and second motors, first and second regulators hour is the frequency, block load balancing, including the adder, the first and second Comparators, the first and second keys, the unit selection module signal controller load balancing, and an adder connected to the outputs of the load sensors, the output of the adder is connected to the inputs of the first and second Comparators and unit selection module signal, the outputs of the Comparators are connected, respectively, with the first and second keys, the outputs of which are connected, respectively, with the third and second inputs of the first inverter, the output of the block selection module signal connected to the input of the regulator load balancing, the output of which is connected to the inputs of the first and second keys, characterized in that it is equipped with a regulator load unit job load, a control block, the block signal initial setup, the hydraulic cylinders move the rail on the bottom, the valves control the hydraulic cylinders move, electro-hydraulic units, including volumetric dosing, the first and second on-off valves, respectively, with first and second, third and fourth electromagnets control, and unit assignments load is connected to the input of the regulator load, the second input is Sedogo and second controllers, frequency, the inputs of each valve and control cylinder move the guideline connected with pressure and drain hydrologically, the first and second output valve control is connected with the piston rod and the cylinder cavities move, third and fourth inputs connected to first and second inputs of the first and second two-position valves, and first and second outputs are connected to opposite cavities volumetric dosing of each electro-hydraulic unit, the first control unit is connected with the output of the second frequency Converter, the second input is connected to the block signal initial setup, and the first, second, third and fourth outputs of the control unit are connected respectively with the first, the second, third and fourth electromagnets control on-off valves electro-hydraulic units.

 

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