Device for controlling drive of frontal machine working tool

FIELD: mining industry.

SUBSTANCE: device has two asynchronous electric engines, connected via reducers to drive sprockets of continuous traction chain, provided with plane carriages with their possible displacement along the guide, and hydraulic cylinders for displacing guide on pit-face. To windings of stators of first and second electric engines connected respectively are outputs of first and second frequency converters, inputs of which are connected to power grid and control inputs of which are connected respectively to outputs of first and second frequency adjusters. To frequency adjusters also connected are inputs of load detectors, to outputs of which load balancing block is connected, outputs of which are connected to inputs of first frequency adjuster. To inputs of both frequency adjusters output of load adjuster is connected, inputs of which are connected to load-setting block and load sensor for second engine. To output of second frequency converter connected are input of control block, other input of which is connected to signal block of base plant, and stator winding of third asynchronous engine, which via mechanical link is connected to first and second hydraulic pumps, having constant working volumes. Output of first hydraulic pump is connected to force hydro-main and input of second preventing hydraulic valve and to first inputs of two-position hydraulic distributors with electromagnetic control, to electromagnets of which outputs of control block are connected. Second inputs of two-positional hydraulic distributors with electromagnetic control are connected to control chambers of hydro-controlled two-positional hydro-distributors, which are part of hydro-blocks. Outputs of hydro-controlled two-positional distributors are connected to opposite hollows of volumetric dosing device of each hydro-block, and their inputs are connected respectively to outputs of hydro-distributors for controlling hydro-cylinder for moving the guide on pit-face, inputs of each of which are connected to force and drain hydro-mains, and outputs are connected to piston and rod hollows of appropriate hydro-cylinder.

EFFECT: higher efficiency.

1 dwg

 

The invention relates to the mining industry, namely, means of mechanization of extraction of natural resources, and can be used in the system of automatic regulation and control electrohydroblock Executive body of the front of the unit.

A device control twin electric supply of the Executive body of the Shearer is placed on the guide with the possibility of translational movement by means of endless conveyor chain / Babakin GI, Shytsky VI, Serov I. Frequency-adjustable electric drive mining machines and installations. M.: Publishing center of MUCTR, 1998, S. 145-146, RIS /. The drive contains two asynchronous electric motor, the rotors of which through the gears and sprockets are connected with a traction chain can move the Executive body of the guide.

The control 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. 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 first and second inverters connected to the load sensors, the outputs of which are connected according to the public with two inputs block load balancing. Two of the output of the block alignment of the loads connected to the two inputs of the first inverter. The output of block frequency associated with the frequency regulators.

When aligning two loads induction motors increased the installed capacity utilization of the Shearer.

The disadvantage of this device 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 and limit the potential performance of the Shearer. 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.

Closest to the present invention is a device for controlling the drive of the Executive body front Assembly (Patent RF, IPC E 21 35/24, E 21 D 9/093, BI No. 22 of 10.08.2003 g).

The drive contains two asynchronous electric motor connected through a gear drive sprocket endless conveyor chain equipped strahovymi carriages can be moved along the guide, the cylinders move the guide on the bottom. The device is Board includes first and second inverters, the frequency regulators, gauges, load block load balancing controller load, the unit job load, the control unit, the block signal initial installation, the valves control the hydraulic cylinders move the rail on the bottom, electro-hydraulic units, including volumetric dosing, the first and second two-position valves respectively with the first and second, third and fourth electromagnets control. The inputs of the inverters are connected to the power network, and the outputs respectively from the stator windings of the first and second electric motors.

The outputs of frequency regulators are connected respectively to control inputs of the first and second frequency converters. The load sensors are connected to the outputs of the frequency converters and the outputs of the load sensors connected to the unit balancing, two outputs which are connected with inputs of the first frequency controller.

Block task load is connected to the input of the regulator load, another input connected to the load cell of the second motor. The controller output load connected to the inputs of the first and second regulators frequency.

The inputs of each valve and control cylinder move the guideline connected with pressure and drain hydrologically, the first and the second you the odes of this valve is connected with the piston rod and the cylinder cavities. The third and fourth outputs of the valve control connected to the two inputs of the first and second two-position valves, and first and second outputs are connected to opposite cavities volumetric dosing of each of the electrohydraulic unit. One input of the control unit is connected with the output of the second inverter, the other input is connected to the block signal initial setup, and four of its outlet connected respectively with the first and second, third and fourth electromagnets control on-off valves electro-hydraulic units.

In the known device with simultaneous adjustment of cutting speed and feed is ensured consistency relations step of cutting the chip thickness and the minimum specific energy consumption for the separation of coal from the array. In addition, by synchronizing the speeds of the cylinders move the guideline is supported by its straightness in the plane of the coal seam and reduces the loss of energy during the movement of the plow carriage.

A disadvantage of the known device is that the speed of movement of the cylinders move the guide by changing the frequency of actuation of electromagnets control leads to a change in the flow rate of the working fluid in the pressure g is promagistrate. When reducing the flow rate of the working fluid it goes over the drain, which reduces the efficiency of the actuator. In addition, a significant total number of electromagnets control continuously operating in pulsed mode, leads to additional energy costs. The result is reduced efficiency electrohydroblock Executive body of the front of the unit while reducing the reliability of the control device.

The task of the invention is to increase the efficiency of electrohydroblock Executive body of the front of the unit while increasing the reliability of the control device of this drive.

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 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. With each section of the guide 9 are connected to the cylinders 10 move this guide at the bottom (on the scheme conditionally shows one cylinder). The third induction motor 11 through a mechanical PE is edacho 12 is connected with the first and second volumetric pumps 13 and 14 with a constant working volume.

Device drive control of the Executive body includes first and second frequency converters 15 and 16, the inputs of which are connected with an electric power network, and the outputs respectively from the windings of the stators of the first and second motors 1 and 2. The inverters 15 and 16 are connected to control outputs of frequency regulators 17 and 18. To the outputs of inverters 15 and 16 are connected to the load sensors 19 and 20. The output of the second frequency Converter 16 at the site prior to entering the load sensor 20 is connected with the stator winding of the third electric motor 11. The output of the load sensor 20 is connected to the input of the regulator load 21, a second input connected to the block task load 22. The controller output load 21 connected to the first input of frequency regulators 17 and 18.

The outputs of the load sensors 19 and 20 are connected respectively to two inputs of unit balancing 23, the first and second outputs connected respectively with the third and second inputs of the inverter 17.

Piston and the rod end of each hydraulic cylinder 10 is connected with the first and second outputs of the valve control 24, the inputs of which are connected to the pump 25 and drain 26 hydrologically. To the pressure supply lines 25 connected to the output of the first hydraulic pump 13.

Each hydraulic unit 27 includes first and second is ekoproblemy-off valves 28 and 29 respectively with the first 30 and second 31, the third 32 and fourth 33 cameras management and volumetric dispenser 34. The third and fourth outputs of the control valves 24 are connected respectively with the first and second inputs of a bistable valves 28 and 29 of each of the hydraulic unit 27, and first and second outputs are connected to opposite cavities volumetric dispenser 34. Camera control 30 and 33 are connected to the first hydroline control 35, and camera control 31 and 32 to the second hydroline control 36.

The output of the second hydraulic pump 14 is connected with the first inputs of the first 37 and second 38-off valves, respectively, with the first 39 and second 40, 41 third and fourth electromagnets 42 management. The second inputs of the valves 37 and 38 are connected with the drain hydroline 43, and their outputs are connected to the first and second hose control 35 and 36.

The control unit 44 is connected to the output of the second frequency Converter 16, the second input is connected to the block signal initial setup 45, and the first, second, third and fourth inputs connected to the electromagnets 39, 40, 41 and 42 control the on-off valves 37 and 38.

The input of the first pressure relief valve 46 is connected to the output of the first hydraulic pump 13, and the input of the second relief valve 47 is connected to the outlet of the second hydraulic pump 14.

The us is the device drive control of the Executive body of the front of the unit works as follows.

In the steady mode, 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 frequency of rotation of the first and second 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 speed of the motors 1 and 2 is determined in turn by the frequency of the alternating current supplied to the windings of the stators of these motors on frequency converters 15 and 16.

The feed speed of the guide 9 on the bottom is determined by the speed of extension of the cylinders 10 and depends on the volume of fluid flowing per unit time in the piston cavity of each cylinder 10 from the pressure supply lines 25 through the valve control 24 mounted in position A.

The total flow rate of the working fluid through pressure hydrological 25 is determined by the performance of the first volume of the hydraulic pump 13, which in turn depends on the displacement of the hydraulic pump, the value of which is constant, gear ratio mechanical transmission 12 and the rotational speed of the third motor 11 with squirrel-cage rotor. The rotational speed of the electric motor 11 is determined by the frequency of the alternating current, supplied to the stator winding of the electric motor 11 from the second frequency Converter 16.

Since the hydraulic cylinders 10 are connected to the pressure supply lines 25 in parallel, the speed of movement of the piston rods of these cylinders is affected by the resistance to movement of the sections of the guide 9 on the bottom. For different values of the resistance movement of the sections of the guide 9, which is working with the front of the unit, the speed of extension of the rods of the hydraulic cylinders 10 will be different, which will lead to the violation of the straightness of the guide 9 in the plane of the coal seam and increase the resistance to the motion of the Executive body.

To synchronize the speeds of the cylinders 10, the rod cavity of each cylinder through the control valve control 24, in position And connected with the first inputs of a bistable hydraulically operated valves 28 and 29 of each of the hydraulic unit 27.

The control unit 44 generates a rectangular control pulses, the frequency of which is determined by the frequency of the alternating current output of the second frequency Converter 16 and in a certain sequence distributes them through communication lines with solenoid control 39, 40, 41 and 42 of the two-position valves 37 and 38. When applying control pulses to the electro is Agnitum 39 and 42, the valve 37 is installed in the left position, and the valve 38 is in the right position. Thus the working fluid by the hydraulic pump 14 is fed under pressure into hydroline control 35 and then to the camera control 30 and 33 on-off valves 28 and 29 of each of the hydraulic unit 27.

The valve 28 is installed in the left position, and the valve 29 is in the right position. Thus the working fluid from the camera control 31 and 32 is displaced in hydroline control 36 and then through the control valve 37 is in the drain hydroline 43.

The working fluid from the rod end of the hydraulic cylinder 10 through the control valve 28 is fed into the left cavity of the volumetric dosing device 34, the piston of which moves to the right, and the hydraulic cylinder 10 merges into hydrological 26 volume of liquid equal to the volume of the dispenser 34.

Under the pressure of the working fluid supplied to the piston cylinder chamber 10 through the first outlet valve 24, the piston rod of the hydraulic cylinder 10 is moved to the bottom together with the guide rail 9 by the corresponding amount.

With the following governing quantum control unit 44 includes a solenoid control 40 and 41, the valve 37 is switched to the right position, and the valve 38 is in the left position. The working fluid under pressure from hydraulic pump 14 enters hydroline control 36 and then to the camera control the Oia 31 and 32. The valve 28 is switched to the right position, and the valve 29 is in the left position, the fluid from the camera control 30 and 33 is displaced in hydroline control 35 and then through the control valve 38 in the drain hydroline 43. The working fluid from the rod end of the hydraulic cylinder 10 enters the right atrium of the volumetric dosing device 34, and from the left cavity is displaced in the drain hydrological 26. As a result, the piston rod of the hydraulic cylinder 10 is again moved together with the guide rail 9 on the bottom. With the following managing tact includes electromagnets control 39 and 42, etc.

Therefore, with the help of hydraulic blocks 27 nomination of all cylinders 10 is synchronous, regardless of the magnitude of the loads acting on the section of the guide 9.

Because the pumps 13 and 14 are connected with an electric motor 11 through a mechanical transmission 12, the speed and performance of these pumps are interrelated and are determined by the frequency of the alternating current supplied from the frequency Converter 16 to the motor 11. Therefore, if you change the performance of the hydraulic pump 13, and therefore the speed of the feed rail 9 on the bottom, synchronously varies the capacity of the hydraulic pump 14. At the same time interrelated changes the frequency of the control pulses, postupaesh the x from the control unit 44 to the electromagnets 39, 40, 41 and 42 of the valves 37 and 38. As a result, the flow rate of the working fluid in a single cycle control remains constant, which reduces the energy cost of the hydraulic pump 14 in the process of regulating the speed of the feed rail 9 on the bottom.

If, for example, increasing the hardness of coal, the actual current of the motor 2, as measured by the load sensor 20 exceeds specified, then the output of the regulator load 21 will receive a signal dependent on the difference between the value of the current supplied with the unit set the load 22 and the actual current value of the motor 2. This signal is applied to the first input of frequency regulators 17 and 18, which affect the frequency converters 15 and 16. 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 sprockets 5 and 6 and the speed /cutting speed/ traction chain 7 and plow carriage 8 along the guide 9.

At the same time reducing the frequency of the alternating current output of the frequency Converter 16 leads to a decrease in the frequency of the control pulses at the output of the control unit 44, and the rotation speed of the motor 11, the mechanical transmission 12 and pumps 13 and 14, as well as the performance of these pumps.

The decrease in the productivity and the security of the hydraulic pump 13 leads to the reduction of the working fluid coming into pressure hydrological 25 in the piston cavity of the hydraulic cylinder 10, and reduce the feed speed of the guide 9 on the bottom.

The decrease in performance of the hydraulic pump 14 takes place with simultaneous proportional reduction in the frequency of the control pulses at the output of the control unit 44, which leads to a corresponding reduction of the switching frequency volumetric metering devices 34 hydraulic blocks 27 simultaneous synchronization of the speeds of the cylinders 10. Because of this decreasing the feed speed of the guide 9 on the bottom ensure the straightness of this guide.

In the proportional reduction of the cutting speed and feed rate chip thickness remains unchanged, therefore, the step of cutting to the thickness of the chip is also kept constant. Along with this, when the cutting speed is lower power motors 1 and 2 and consumed current up to the specified level.

When reducing the actual current consumed by the motor 2, for example, due to the lower hardness of coal, the regulator load 21 with regulators frequency 17 and 18 and frequency converters 15 and 16 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 sorostitute guide 9 on the bottom while maintaining its linearity. As a result the load of the motors 1 and 2 is increased and stabilized 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 increased or decreased.

Signals proportional to the current of motor 1 and motor 2, are received respectively from the load sensors 19 and 20 to the inputs of unit balancing 23. If, for example, the current of the electric motor 2 is greater than the current of the motor 1, the output of the block alignment of the load 23 is connected with the third input of the inverter 17, a signal 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 are compared. If the current of the motor 1 exceeds the current of the electric motor 2, the output unit balancing 23 associated with the second input of the inverter 17, a signal is negative, which leads to the reduction of the power of the motor 1 and the reduction of its current, to the current value of the motor 2.

If you want kinomomente off the flow guide 9 on the bottom, the block signal initial setup 45, the signal, which output control unit 44 receives the control signal to activate the electromagnets 40 and 42 on-off valves 37 and 38. These valves are switched to the right position, stops the reciprocating volumetric metering devices 34 and, therefore, discharge the working fluid from the rod ends of the cylinders 10 in the drain hydrological one hydraulic cylinders 10. The pressure of the working fluid at the output of the hydraulic pumps 13 and 14 is limited due to the relief of the hydraulic valve 46 and 47, propuskayuschih working fluid to drain.

To enable the feed rail 9 of the Executive body on the bottom stop signal from the block 45 and the control unit 44 starts generating control pulses for switching the electromagnets 39, 40, 41, 42 and associated valves 37 and 38. Pressure relief hydraulic valve 46 and 47 are closed and the device drive control of the Executive body begins to work in the above sequence.

With long breaks in operation, the valves 24 are set in a neutral position C. When the switching valves 24 in position D and turns and reversing gidrol is indrow 10, 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 and elements in combination with the change and the introduction of additional connections between the modules and elements of the device drive control of the Executive body of the front of the unit allows to increase the efficiency of the feed drive of the Executive body on the face due to the fact that the automatic change of the feeding speed is achieved by application of variable frequency drive volumetric pumps, allowing the performance of these pumps in every moment of time corresponds to the desired value, the feed rate, interconnected with adjustable cutting speed. At the same time increases the reliability of the device control due to a significant reduction in the number of solenoid control valves.

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, the cylinders move towards the shining on the face, 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 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, power leveling loads connected to the outputs of the load sensors and the first and second outputs connected respectively with the third and second inputs of the first frequency regulator, the regulator load, the unit job load, and unit assignments load connected to the regulator input load, the second input is connected with the load sensor of the second motor, and the output of the regulator load is connected to the first inputs of the first and second frequency regulators, the power control unit signal initial setup, and the first control unit is connected with the output of the second frequency Converter, the second input is connected to the block signal initial installation, the valves control the hydraulic cylinders move the rail on the bottom, and the inputs of each valve and control cylinder move connected with pressure and drain hydrologically and first and second outputs connected to the piston rod and the cavity of the cylinder, volumetric dispensers, the first and second two-position valves respectively with the first and second, third and fourth electromagnets control, associated respectively with the first, second, third and fourth outputs of the control unit, characterized in that it is provided with a first and second volumetric pumps with constant working volume, the third asynchronous motor, mechanical transmission, the first and second pressure relief hydraulic valve, hydraulic blocks comprising first and second hydraulically operated two-position valves respectively with the first and second, third and fourth chambers of the administration and the third electric motor through a mechanical transmission connected with the first and second hydraulic pumps, winding his the stator is connected to the output of the second frequency Converter, the output of the first hydraulic pump is connected with a pressure hydrologically and the input of the first safety valve, the outlet of the second hydraulic pump is connected to the input of the second safety valve, and the first inputs of two-position valves with solenoid control, their second inputs connected to the drain hydroline, and first and second outputs connected to first and second hose control, and the first pilot line connected spurway and fourth cameras control hydraulically operated two-position valves, and the second pilot line with second and third chambers of the control of these valves, the first and second inputs of the first and second hydraulically operated two-position control valves associated respectively with the third and fourth outputs of the valves control the hydraulic cylinder moving the rail on the bottom, and first and second outputs are connected to opposite cavities volumetric dosing of each hydraulic unit.



 

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FIELD: mining industry.

SUBSTANCE: device has two asynchronous electric engines, connected via reducers to drive sprockets of continuous traction chain, provided with plane carriages with their possible displacement along the guide, and hydraulic cylinders for displacing guide on pit-face. To windings of stators of first and second electric engines connected respectively are outputs of first and second frequency converters, inputs of which are connected to power grid and control inputs of which are connected respectively to outputs of first and second frequency adjusters. To frequency adjusters also connected are inputs of load detectors, to outputs of which load balancing block is connected, outputs of which are connected to inputs of first frequency adjuster. To inputs of both frequency adjusters output of load adjuster is connected, inputs of which are connected to load-setting block and load sensor for second engine. To output of second frequency converter connected are input of control block, other input of which is connected to signal block of base plant, and stator winding of third asynchronous engine, which via mechanical link is connected to first and second hydraulic pumps, having constant working volumes. Output of first hydraulic pump is connected to force hydro-main and input of second preventing hydraulic valve and to first inputs of two-position hydraulic distributors with electromagnetic control, to electromagnets of which outputs of control block are connected. Second inputs of two-positional hydraulic distributors with electromagnetic control are connected to control chambers of hydro-controlled two-positional hydro-distributors, which are part of hydro-blocks. Outputs of hydro-controlled two-positional distributors are connected to opposite hollows of volumetric dosing device of each hydro-block, and their inputs are connected respectively to outputs of hydro-distributors for controlling hydro-cylinder for moving the guide on pit-face, inputs of each of which are connected to force and drain hydro-mains, and outputs are connected to piston and rod hollows of appropriate hydro-cylinder.

EFFECT: higher efficiency.

1 dwg

FIELD: mining industry.

SUBSTANCE: mining combine has extraction means, on which a body is mounted, having at least one first liquid outlet, for supplying liquid to material. Pipeline, through which liquid is fed to first liquid outlet, contains means for measuring flow and/or pressure of liquid in pipeline, for determining, in which of to layers outlet is positioned. Combine can have at least one second liquid outlet, placed in such a way, that first liquid outlet is in lower layer, and second liquid outlet is placed in upper layer. First liquid outlet can have one of multiple first liquid outlets spaced from each other, and second liquid outlet - one of multiple spaced from each other second liquid outlets. Efficiency of liquid flow through multiple spaced first outlets can surpass those of multiple spaced from each other second liquid outlets. Placement of second liquid outlet in separate body cover is possible. First and second liquid outlets can be directed downwardly relatively to direction of mining combine displacement. Method for controlling depth of position of mining combine extraction means includes placing two liquid outlets, interacting with material extraction means, in a material, while second liquid outlet is placed above first liquid outlet, liquid is fed to first and second liquid outlets and flow and/or pressure of liquid is measured. Layer, wherein liquid outlet lies, is detected, and first liquid outlet is placed in lower layer and second liquid outlet is placed in upper layer, to determine depth of position of extraction means relatively to two layers.

EFFECT: higher precision.

2 cl, 9 dwg

FIELD: mechanical engineering, particularly to perform remote control specially adapted for machines for slitting or completely freeing the mineral.

SUBSTANCE: system includes electric drive for cutting tools, hydraulic drive for feeder legs and crawler, two-stage control hydroblock to operate the hydraulic drive having inlet channel, hydrocylinder with piston cavity for support erector, control hydroblock adapted to operate support erector hydrocylinder, blocking hydrocylinder having spring-loaded shaft return means, two-positioned pilot spool, pumps, pressurizing means and discharge means. Pilot spool has outlet channel and hydrocontrol cavity to provide pilot spool fixation in two working positions. Outlet channel of pilot spool communicates with outlet channel of two-stage control hydroblock adapter to operate the hydraulic drive of feeder legs and crawler to provide alternate communication between outlet pilot spool channel and pressurizing and discharge means. Hydrocontrol cavity of pilot spool communicates with blocking hydrocylinder and piston cavity of support erector hydrocylinder.

EFFECT: increased safety for people present in zone of moving mining machine parts action.

1 dwg

Well drilling rig // 2265121

FIELD: mining industry, particularly for drilling exploratory and pressure-relief wells before mineral extraction from formations, including outburst-dangerous formations and ones characterized with high gas content.

SUBSTANCE: drilling rig comprises housing, support, drive to rotate drilling rod provided with cutting tool and hydraulic cylinder for cutting tool pulldown. Electrohydraulic valve is installed in hydraulic cylinder circuit. Electric drive of electrohydraulic valve is linked with load-sensing unit, which detects load applied to drilling rod rotation drive. The electric drive is connected to load-sensing unit through amplifier relay to provide bringing amplifier relay into operation when load applied to rotation drive exceeds nominal load by 20-30%. Cutting tool is made as symmetric screw conveying surfaces defining forward and reverse strokes connected one with another through generatrix. Side cutting edges of surfaces defining forward and reverse strokes are spaced apart.

EFFECT: increased operational reliability along with reduced power inputs for drilling, possibility to remove rod from well with negligible deviation thereof from predetermined direction of drilling.

2 cl, 3 dwg

FIELD: mining, particularly remote control specially adapted for machines for slitting or completely freeing the mineral.

SUBSTANCE: device comprises the first, the second and the third asynchronous motors. The first and the second electric drives are connected to drive sprocket of closed pull chain provided with plough carriages, which may move along guiding means. Device also has hydraulic cylinders to move guiding means to face, mechanical gear, the first and the second safety hydraulic valves, the first and the second hydraulic pumps, the first and the second frequency converters, the first and the second frequency regulators, load sensors, load balancing unit, load regulator, load assignment unit, control unit, initial setting signaling unit, hydraulic distribution means, which control hydraulic cylinders to move guiding means to face, hydraulic units, electrohydraulic unit, channel switching unit, flow meter, excavated seam thickness setting unit, breakage face length setting unit, multiplication unit, divider, optimizing peak-holding controller, control signal generation unit, asynchronous single-phase motor and screw gear made as a nut and screw. The first and the second hydraulic pumps include volume regulation means.

EFFECT: reduced specific energy consumption along with increased front plant output.

1 dwg

FIELD: mining.

SUBSTANCE: invention relates to mining, in particular, to navigation system of combined cutter-loader intended for operations in open-pit bench. This mining equipment includes a combined cutter-loader, a conveyor assembly, and a steering assembly, which joins said combined cutter-loader and conveyor assembly. In addition, this equipment includes a course sensor and a steering device, which is sensitive to signals from said course sensor. The first drive is located in combined cutter-loader, in conveyor assembly, or in steering assembly. The first drive is placed on one side of combined cutter-loader centreline. In addition, the second drive is located either in combined cutter-loader, or in conveyor assembly, or in steering assembly. The second drive is placed on another side of combined cutter-loader centreline. The first and the second drives are used to adjust angle of joint between combined cutter- loader and conveyor assembly on either side of parallel line in order to keep pre-defined direction of combined cutter-loader advancing.

EFFECT: precise driving of combined cutter-loader in order to increase coal cutting from mining zone.

22 cl, 13 dwg

FIELD: mining.

SUBSTANCE: device for control over arrow of operating member of mining machine consists of hydro-cylinders of vertical lifting an horizontal turn and of arrow telescope, of half-throttle, included into line feeding working fluid into piston cavities of lifting hydro-cylinders, of double-sided hydro-locks included into feeding lines of lifting hydro-cylinders and telescope, of main distributors of hydro-cylinders control for lifting, turn and telescope, which are successively arranged to provide free overflow of working fluid into tank in neutral position, of main electro-hydro-distributors for control over main distributors and over additional distributor automatically switched on. There is also a main and additional pumps, a pressurising collector, safety valves, test pressure gages, a pressure regulator, a tank for hydro-system working fluid, and a control panel with buttons for six commands. Further the device contains a control station with a circuit of three memory elements and the element of logical function or operation, additional distributors with back valves on their outputs and correspondingly with throttles on control lines, pointed sensors of feedback, installed correspondingly on the hydro-cylinders and connected to memory elements.

EFFECT: power stabilisation of operating member of mining machine, increased efficiency of working member drive operation, increased energy saving at mine working and grade of extracted coal.

3 cl, 4 dwg

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