Safety system of electrically-driven climbing crane

FIELD: transport.

SUBSTANCE: invention relates to machine building and can be used in control protection systems of electrically-driven load lifting machinery. The system incorporates a digital computing unit (1) with its data inputs connected, a multiplexer data exchange channel, with the crane parameter recording peripherals, while its outputs are connected with crane parameter recorder (3) with a real-time counter, display unit (4), nonurgent alarm unit (5), actuator unit (6) and external memory unit (2) connected to the digital computing unit by a duplex data exchange channel. The system comprises the crane supply voltage parameter meters (81...8n) with their outputs connected, via the multiplex data exchange channel, to additional crane parameter recorder data inputs, those of the computing unit and the display. The digital computing unit is designed to compare the measured voltage with tolerable supply voltage parameters, to generate crane motions inhibiting signals in the case of the supply voltage parameters falling beyond tolerances for crane control system, to generate signals inhibiting certain types of the cranes motions in the case of the crane drives supply voltage falling beyond tolerances and to generate sound and light nonurgent alarm signals under the aforesaid conditions.

EFFECT: higher reliability of the crane operation.

2 cl, 1 dwg

 

The invention relates to the field of lifting and transport machinery and can be used in control systems and protection of load-lifting machines.

According to the requirements of normative documents cranes are equipped with instruments and safety devices of various types: limiters of the labour movement, limiters load-carrying capacity or load moment devices coordinate protection devices for protection against drop and boom the crane with electric at the breakage of any of the three phases of the mains by blocking the work of the respective lifting mechanisms of the machine in accordance with the requirements of the rules PB 10-382-00 etc.

Known security systems crane, a digital computing unit, to the information input of which is connected multiplex channel of communication peripherals registration parameters of the crane and to the outputs - Registrar settings of a crane with a real time clock, unit a visual indication that the unit alarms and Executive unit, and the external storage device connected to the digital computing unit two-way channel of communication (see, for example, RF patent for useful model №38747, VS 23/90, 10.07.2004 - prototype). The system according to the patent of Russian Federation №38747 use is implemented in an integrated device security PMC-B (load Limiter tower crane PMC-B. The user guide. LGFI-RA, JSC "Arzamas instrument plant", p.1-19, 48-49). The device of the PMC-B provides protection for tower crane overload and tipping during lifting, the protection of working equipment from damage when working in cramped conditions (coordinate protection), displaying information about the actual weight of lifted load, ultimate load, degree of loading of the crane, the magnitude of the departure, hook height, the position of the crane on the way and wind speed. Built in to the unit Registrar settings of the crane provides a record and long-term storage of information about the operating parameters of the crane, of the quantities and dates of overloads, as well as on the degree of loading of the crane during the entire service life of the limiter. However, the known security system does not exclude the possibility of disabling certain types of drives, such as drive and rotate the drive movement of the crane, because short-term fluctuations, which in itself can lead to an emergency situation due to the buildup of cargo.

Today, there are a number of devices performing the measurement of the supply voltage on the three phases, for example, "ATE-13" (CJSC "MEANDER", St. Petersburg); "USAF-SM" (CJSC "ScanEx " CROS", Ivanteevka, Moscow region); "RKF-1" (JSC "Altar", Tver). These instruments are used in grozoth is mnih cranes with electric but they have the following disadvantages.

1. The impossibility of control parameters supply voltage (UPete) for relay control valve, as these devices only provide protection to the engine from tipping over. This is because there are a number of conflicting requirements voltage level for certain types of electrical equipment hoisting crane. For electric motors are allowed unbalance to 0,7Unwhere Un- rated voltage, and symmetrical voltage drops to 0,5Unand for of relaying the permissible range of supply voltage 0,9Un<UPete<1,1Un.

2. It is possible to disable individual types of actuators such as the actuator is rotated, the drive movement of the crane, because short-term fluctuations due to the fact that these devices are not able to determine specifically what phase is skewed. This disables all drives with the imposition of the brakes, including the actuator's rotation and movement of the crane, which in itself can lead to an emergency situation due to the buildup of cargo.

3. No registration required voltage level for a more objective investigation of possible emergency situations, as when locking operation by the driver KRA is and or service personnel listed devices by shorting Executive contacts with the subsequent removal of this lock, it is impossible to objectively determine why the accident occurred crane with electric drive.

For example, the crane KB-408.21 production Nyazepetrovsk crane manufacturing plant using relay control phases ATE-13 is controlled by:

1) the unbalance voltage to power the engines to 0,7Un(i.e. it is allowed voltage drop in single phase up to 154 at a nominal voltage of 220 V at other phases);

2) symmetric voltage drop between phases to 0,5Un(i.e. Pets reduction in line voltage simultaneously between the three phases to 190).

However, for relay control power motors on the crane KB-408.21, Pets reduction of the supply voltage to 0,85Un(i.e. the voltage coil of relay automation should not be less than 323).

Thus, the relay control phases ATE-13 may not prevent the operation of the control circuit to an invalid voltage level, which may lead to emergency situations. In addition, the relay control phases ATE-13 when triggered, regardless of which of the three phases has occurred "drawdown" voltage, closes its contact set in the circuit of the line contactor, which in turn disables all drives of the crane, which can lead to unacceptable load from swinging, especially when the drive is off n the gate.

The present invention is to create a lifting crane, providing differentiated prohibition of the operation of various types of electrical equipment of the crane in unacceptable levels of supply voltages. An additional object of the invention is the exception of emergency shutdowns of certain types of actuators such as the actuator is rotated, the drive movement of the crane, because short-term fluctuations. Another object of the invention is check voltage level for a more objective investigation of possible accidents, informing the driver of the crane on the voltage level and warning the driver of the crane about the deviation from the predetermined voltage level.

Thus, the technical result achieved is expressed in increasing the reliability of the crane.

Problem solving and achievement of the technical result is ensured by the fact that the security system load-lifting crane, a digital computing unit, to the information input of which is connected multiplex channel data outputs of the peripheral device registration parameters of the crane and to the outputs - Registrar settings of a crane with a real time clock, unit visual display unit preduprediteln the th signaling and the Executive unit, and the external storage device connected to the digital computing unit two-way channel of communication with datalogger parameters supply voltage electrical crane, the outputs are connected multiplex channel for the exchange of additional information to the digital inputs of the computing unit and to additional inputs of the recorder parameters of the crane and block visual indication and the digital computing unit is adapted to compare the measured voltage with valid parameters supply voltage, the signal on the prohibition of all movements of the crane when the deviation of the supply voltage within the acceptable level for crane management system, generating a signal to disable certain types of movements of the crane when the deviation of the supply voltage within the acceptable level of the actuator of the crane and the formation of a warning light and audible signal when the deviation of the supply voltage within the acceptable level.

Each meter parameters supply voltage of the electric valve is a serially connected divider, integrator and an analog-to-digital Converter whose output is the output of the meter.

The drawing shows the functioning of the social scheme of the proposed system security load-lifting crane with electric drive.

The security system includes a digital computer unit 1, the external storage device 2, the Registrar 3 parameters faucet with built-in real time clock, block 4 visual indication, block 5 alarms, Executive unit 6, the peripheral device 71...7mthe registration parameters of the crane and measures 81...8nparameters supply voltage electrical equipment crane (for example, line voltage between phases voltage among phases and neutral and so on). Each meter 81...8nsupply voltage electric equipment of the crane contains serially connected divider 9, the integrator 10 and the analog-to-digital Converter 11, the output of which is the output of the meter.

The external storage device 2 is connected with a digital computing unit 1 two-way channel of communication. To the outputs of the digital computing unit connected Registrar 3 parameters of the crane, block 4 visual indication, block 5 alarms and Executive unit 6.

The outputs of the peripheral devices 7 registration parameters of the crane is connected to a multiplex channel of communication to the digital inputs of the computing unit 1. The outputs of the probes 81...8nparameters supply voltage electrical equipment is wound is connected multiplex channel data exchange additional information to the digital inputs of the computing unit 1, and also to additional inputs of the recorder 3 parameters of the crane and the block 4 visual indication.

Peripherals 71...7mthe registration parameters of the crane is placed in different zones of the crane and include analog sensors with analog-to-digital converters and digital sensors. Analog sensors measure the smoothly changing parameters of the crane and is used to measure the sensitive elements with linear and non-linear output signal. Digital sensors measure the discrete parameters of the crane.

The system works as follows.

When operating crane peripherals 71...7mprovide measurements of the parameters characterizing the loading of the crane and the location of the lifting equipment. The values of operating parameters of the crane on the multiplex channel data are transmitted in digital computing unit 1, which, working on the program defined in the design of the safety device and the pre-recorded in the external storage device 2, compares the actual loading crane with a maximum allowable, and compares the actual position of lifting equipment with a zone of valid provisions, and depending on the results of the comparison outputs a signal on the IV is positive unit 6 to allow or deny certain types of movements of the crane.

Parameters supply voltage U1...Unserved through the dividers 91...9n(to reduce the signal level) and the integrators 101...10n(to determine the current voltage level) to the analog-to-digital converters 111...11n. Using multiplex communication line signals from the outputs of the analog-to-digital converters 111...11nserved in a digital computing unit 1, and the Registrar has 3 parameters of the crane and the block 4 visual information. In digital computing unit levels of supply voltages are compared with predetermined levels in the external storage device.

For example, when using the device on the crane KB-408.21, assuming that the line voltage between phases "A" and "C" (UAC)is supplied to the control circuit must not be less than the 323, and the voltage on phase "B" should not be less than 154, the value of the supply voltages appear in the external storage device. The evaluator compares the acceptable levels of voltage with current values. If UAC<325, disables all movement, because the control system of the crane cannot function normally. When the voltage on phase "B" is less than 154, disabled, only the actuators raise and change the departure and actuators move the position and rotation of the crane remain in work, as they can not lead to an emergency situation, such as a falling load. In addition, information about low-level supply voltage is supplied to the block 4 visual indication on the unit 5 warning information. This gives the opportunity to more quickly determine the cause of the stop of the actuator of the valve and to reduce the downtime of the crane. Registration of cases insufficient voltage level also extends to investigate possible emergency situations.

The claimed security system hoisting crane with electric drive can be manufactured with the use of modern components and technology. For the implementation of digital computing unit, you can use the MSP430F149 microprocessor firm Texas Instruments (USA) or other microprocessors of this type. As a peripheral device registration parameters of the crane may be used commercially available products Arzamas instrument plant, such as analog sensors displacement LGFI, LGFI, LGFI and their execution, or new development of digital sensors, in particular the force sensor digital DOC LGFI, and similar equipment other instrument factories.

1. Security system crane with electric drive, containing the I digital computing unit, to the information input of which is connected multiplex channel data outputs of the peripheral device registration parameters of the crane and to the outputs - Registrar settings of a crane with a real time clock, unit a visual indication that the unit alarms and Executive unit, and the external storage device connected to the digital computing unit two-way channel of communication, characterized in that it is provided with power supply voltage parameters of the electrical equipment of the crane, the outputs are connected multiplex channel data exchange additional information to the digital inputs of the computing unit and to additional inputs of the recorder parameters of the crane and block visual indication and the digital computing unit is adapted to compare the measured voltage with valid parameters supply voltage, the signal on the prohibition of all movements of the crane when the deviation of the supply voltage within the acceptable level for crane management system, generating a signal to disable certain types of movements of the crane when the deviation of the supply voltage within the acceptable level for drives of the crane and the formation of a warning light and audible signal when the deviation of the pair of the EAN of the supply voltage within the acceptable level.

2. The system according to claim 1, characterized in that each measuring parameters supply voltage electrical equipment crane contains serially connected divider, integrator and an analog-to-digital Converter whose output is the output of the meter.



 

Same patents:

FIELD: transportation.

SUBSTANCE: in compliance with the proposed method, with electric key set up, loads are uplifted in turn, their weights making m0, ..., mi-1, mi where i=2, 3, ..., and the motor shaft respective rpm making n0, ..., ni-1, ni being recorded by means of the accelerometer arranged on the base plate or the crane motor bed are memorised. The accelerometer output signal is subjected to spectral analysis with the frequency whereat the motor bed vibration fundamental amplitude is determined corresponding to the motor shaft rpm. Now, proceeding from the data obtained, the dependence of the motor rpm upon the uplifted load n=f(m) is derived to be memorised along with the known tolerable uplifted load weight value. Now, uplifted the load, the motor shaft rpm value is continuously measured by accelerometer to define, proceeding from n=f(m), the load weight. If this weight exceeds the tolerable value, audio and visual warning signals are output and the crane if cut off.

EFFECT: higher reliability of the crane capacity limiter.

6 dwg

FIELD: hoisting-and-transporting mechanical engineering.

SUBSTANCE: invention can used in the crane control and safety systems. Method consists in transfer of control signals from remote control board (RCB) located outside the crane using a two-way line of wireless communication, measuring the working parameters, converting measured sizes into digital signals, defining safe loads and limiting positions of the crane structural components and switching off its mechanisms on reaching limiting values, recording the crane operating and data signals and time of their arrival into long-term nonvolatile memory to be read out in case of need, and also their remote transfer to the dispatcher control located outside the crane. In addition, RCB outputs the instructions to transfer the crane data and control signals to be written down into RCB nonvolatile memory to be read out in case of need by transmitting the signals to the dispatcher control station, registration and storage of data on the crane operation. Here, note that two-way wireless communication lines are used to this end.

EFFECT: higher reliability of control and registration of crane working parameters.

1 dwg

FIELD: transportation.

SUBSTANCE: adjustment consists in regulation of signals in channels of measurement of boom load, overhang or inclination angles by adding and/or multiplying these signals with the signals corresponding to the adjusting parameters the values of which are preliminary defined and stored in power-independent memory of the safety device. Regulation is made without of reference cargoes proceeding from the conditions of independence of the results of measurement of the lifted and moved cargoes upon the boom length and inclination angle. Values of adjusting parameters are defined, allowing for the boom deflection, as the constants or functions of the boom overhand, length and inclination angle by commands of the operator/crane operator or automatically. The principle of definition of adjusting parameters is based, in particular, on their calculation as unknown factors in a set of the equations derived using the crane mathematical model. The said device contains transducers of the load-lifting crane operating parameters with digital or analog outputs and the digital computing device with power-independent memory.

EFFECT: opportunity of checking the accuracy of the safety device operation without check cargoes is ensured and efficiency of protection of the load-lifting crane is increased.

16 cl, 1 dwg

FIELD: construction.

SUBSTANCE: series of inventions refers to the sphere of tower crane operation security engineering. The method in question presupposes exchange of information on the cranes locations, movements and equipment loads between the control and protection devices of all the "n" jointly operating tower cranes. Additional features: identification of the position of each crane and/or its equipment against the construction site plan, conventional graphical visualisation of the position within the construction site territory of a specified crane and/or its equipment (as well as that of the "neighbouring" cranes and equipment related to them) on the crane display. When the crane operator initiates relocation of equipment related to crane Ki the following is carried out: the intended equipment motion path tracing, display graphical visualisation of the intended motion path(s) of the equipment related both to crane Ki and the "neighbouring" crane(s) whose equipment is currently in motion (by means of exchange of information between the control and protection devices), estimation of the minimum distance between the above paths, graphical visualisation of the point of intersection on the crane Ki display and generation of a signal disabling operation of this crane equipment and light and sound alarm signals in case the paths as having been traced happen to intersect. In order to enable further motion of the crane Ki equipment there is an additional line to be plotted by the crane operator which is intended to restrict motion of the crane equipment (the line becomes graphically visualised on the crane Ki, screen); in case the limiting line has been plotted erroneously operation of the crane Ki equipment and mechanisms is automatically disabled when at the paths intersection point.

EFFECT: improving the hoisting cranes operation standard of safety.

4 cl, 3 dwg

FIELD: mechanical engineering.

SUBSTANCE: invention relates to load-lifting and transportation equipment and it can be used in protection systems of load-lifting cranes. According to proposed method, tolerable loads are determined and memorized in form of function of spatial position of boom, measuring current value of load in process of operation of crane, comparing it with tolerable load and generating warning signal or signal to crane mechanisms aimed at limiting or preventing overload. In process of lifting and/or shifting of load, change of linear or angular position of crane part is revealed additionally whose change is not allowed in current stage of load lifting and/or shifting process. Depending on value of said change of position, additionally warning information signals or crane mechanism control signals are formed aimed either to prevent further increase in said change or to return said part of crane, for instance, boom, into initial position. Protection of crane from overload is implemented with due account both of absolute value and change of value of angle of tilting of crane component part from horizontal or vertical position in process of lifting and/or shifting of load.

EFFECT: improved safety of crane in operation.

21 cl, 1 dwg

FIELD: mechanical engineering; lifting and transportation machinery.

SUBSTANCE: invention can be used in automated protection and control systems of load-lifting cranes. Load-lifting machines drive is controlled by operator acting onto control member, transmission of shifting of said member to control member of drive made to shift any mechanism of load-lifting machine depending on movement of control member, and preliminary determination of tolerable value of at least one parameter characterizing load and/or spatial position of boom or load-gripping member of load-lifting machine, keeping the parameter value in memory, measuring said parameter by direct or indirect method in process of operating of load-lifting machine, comparing measured value with tolerable value and subsequently shaping drive control signal. Control signal is used to interlock shifting of drive control member and if, necessary, to reset member in neutral position. Interlocking of drive control member is done by mechanical blocking of transmission of control member shifting to drive control member or mechanical interlocking of displacement of said member.

EFFECT: increased reliability.

6 cl, 3 dwg

FIELD: mechanical engineering; tower cranes.

SUBSTANCE: method includes periodical continuous polling during which signals are obtained, recorded and memorized which correspond to values of load characteristic of crane, crane geometry and operation conditions, obtained signals are compared with values of characteristics introduced into crane control system before its operation, and after comparing of signals received at polling with tolerable values of characteristics, if they exceed tolerable characteristics, commands of crane operator are cancelled. Introduced additionally into crane control system are parameters of crane operation conditions, speed of wind, ambient temperature and crane condition parameters, load, vibration, temperature of crane drive mechanism lubricants, and voltage in electrical devices. Maximum tolerable values of said parameters are introduced into control system to limit operation of crane drives at which operation of crane should be stopped or can be executed at introduction of definite limitations into operation of crane drive as to speed, accelerations, combined or successive travel motions of drives, obtained signals concerning operation and state of crane are compared with tolerable values, and possibility and conditions of execution of operator's commands are determined, command is left without changes or definite limitations are applied to operation of crane by introducing corresponding corrections to operator's command or execution of command is prohibited according to preset program.

EFFECT: improved safety of operation of tower crane.

1 dwg

FIELD: mechanical engineering; lifting and transportation machine building.

SUBSTANCE: invention can be used in control and protection system of load-lifting cranes. Proposed system contains load pickups 1, boom tilting angle pickups 5, parameters indicator 6 and series-connected tolerable load setting unit 8, comparator 9 and actuating unit 10 whose output is connected to first input of parameters recorder 11, unit to record designed values of parameters 12, correction unit 3, load weight check unit 2, scaling unit 4, variable coefficients unit 14, change-over switch 15, boom deflection recording unit 13 and boom reach calculating unit 7.

EFFECT: improved safety of crane owing to increased accuracy of control of its parameters.

2 cl, 2 dwg

FIELD: lifting and transportation mechanical engineering, namely system for ensuring safety of operation of lifting equipment; possible use for preventing dangerous approach of jib type cranes with telescopic crane arms to power lines.

SUBSTANCE: device for detection of electric field of power line contains an antenna and antenna amplifier, where at least a part of antenna is made in form of flat capacitor mounted on rotary device of crane, and current-conductive plates of flat capacitor are connected to input of antenna amplifier. Positioning of antenna in form of flat capacitor not on the head of crane arm, but on rotary device, ensures safety of crane operation during installation of fly jib, and also results in increased comfort of operation, particularly, low length of communication line and exclusion of drum for winding cable, removing causes for cable tearing under conditions of real applications.

EFFECT: increased efficiency.

2 cl, 4 dwg

FIELD: hoisting and transportation machinery, particularly to control and protect hoisting machines against overload.

SUBSTANCE: system comprises the first control means group installed on support structure or on equipment parts not to be separated from structure. The first control means group includes digital data processing unit 2 having output connected to executive and signaling device 4, 5 units, the first data input-output unit 3 linked to digital data processing unit with two-directional data exchange channel, crane 6 parameter sensors and power supply unit 1. Power supply unit 1 has one clamp connected to load-lifting machine body and another clamp secured to power supply system bus. The second control means group is supported by movable structure or equipment to be demounted and includes crane parameter sensors 10. The first and the second control means groups are linked one to another through two-directional radioline. The first control means group is provided with the first receiving/transmitting radio station, independent power source 15 and switchboard 16.

EFFECT: increased safety system reliability, simplified assemblage and installation thereof on load-lifting machine.

1 dwg

FIELD: transportation.

SUBSTANCE: activator with a permanent magnet is fitted on the shaft for the magnet to rotate with the controlled equipment changing its position. Two hermetic contacts are arranged to be operated by the permanent magnet field effect in compliance with the shaft rotation direction. The count direction determination unit defines, proceeding from the hermetic contacts operation sequence, the shaft direction of rotation, i.e. direction of the equipment position change, and the reversing counter content increase or decrease pulses are generated to be sent to the aforesaid counter. The counter content current values defines the hoisting machine grid point to be sent to the output characteristic shaper. The latter, to comply with the values and parameters set by output characteristic controller 8, generates the pickup output signals, discrete, analog or digital. The supervisor controls the availability of the pickup outside power supply. With the pickup operated from the outside source, the supervisor switches over the switcher so that the hermetic contacts, count direction determination unit reversing counter are fed from the power supply circuit. In case the machine supply circuit voltage downs below the tolerance, the supervisor switches over the switcher so that the aforesaid units are supplied from the independent power source (storage battery) to allow controlling the equipment position change without outside power supply. In case the machine power supply is OK, the supervisor instructs the charger to charge the independent power source.

EFFECT: higher reliability of the position pickup and its expanded potentialities.

5 cl, 1 dwg

FIELD: hoisting-and-transporting mechanical engineering.

SUBSTANCE: invention can used in the crane control and safety systems. Method consists in transfer of control signals from remote control board (RCB) located outside the crane using a two-way line of wireless communication, measuring the working parameters, converting measured sizes into digital signals, defining safe loads and limiting positions of the crane structural components and switching off its mechanisms on reaching limiting values, recording the crane operating and data signals and time of their arrival into long-term nonvolatile memory to be read out in case of need, and also their remote transfer to the dispatcher control located outside the crane. In addition, RCB outputs the instructions to transfer the crane data and control signals to be written down into RCB nonvolatile memory to be read out in case of need by transmitting the signals to the dispatcher control station, registration and storage of data on the crane operation. Here, note that two-way wireless communication lines are used to this end.

EFFECT: higher reliability of control and registration of crane working parameters.

1 dwg

FIELD: transportation.

SUBSTANCE: device contains the boom equipment load and spatial position pickups, the output device, the graphic display with the graphic memory unit and the processor connected with the said pickups, graphic display and output device connected to crane actuators. The processor generates a schematic image of the crane and its operating area on the screen of the graphic display. In the first version of the device, the processor produces a dynamic image on the display of the crane operating area proceeding from the necessity to prevent the crane overload and its collisions with obstacles. In other versions of the device, the operating area is generated on the display by the signals received from outside moving or stationary objects using the crane operating area locator signals, using boom equipment extreme coordinates in motion and/or signals generated by operator acting on the sensor display screen capable to output 3D images.

EFFECT: higher safety of the load-lifting crane operation.

20 cl, 2 dwg

FIELD: construction.

SUBSTANCE: series of inventions refers to the sphere of tower crane operation security engineering. The method in question presupposes exchange of information on the cranes locations, movements and equipment loads between the control and protection devices of all the "n" jointly operating tower cranes. Additional features: identification of the position of each crane and/or its equipment against the construction site plan, conventional graphical visualisation of the position within the construction site territory of a specified crane and/or its equipment (as well as that of the "neighbouring" cranes and equipment related to them) on the crane display. When the crane operator initiates relocation of equipment related to crane Ki the following is carried out: the intended equipment motion path tracing, display graphical visualisation of the intended motion path(s) of the equipment related both to crane Ki and the "neighbouring" crane(s) whose equipment is currently in motion (by means of exchange of information between the control and protection devices), estimation of the minimum distance between the above paths, graphical visualisation of the point of intersection on the crane Ki display and generation of a signal disabling operation of this crane equipment and light and sound alarm signals in case the paths as having been traced happen to intersect. In order to enable further motion of the crane Ki equipment there is an additional line to be plotted by the crane operator which is intended to restrict motion of the crane equipment (the line becomes graphically visualised on the crane Ki, screen); in case the limiting line has been plotted erroneously operation of the crane Ki equipment and mechanisms is automatically disabled when at the paths intersection point.

EFFECT: improving the hoisting cranes operation standard of safety.

4 cl, 3 dwg

FIELD: technological processes.

SUBSTANCE: method includes determination of crane equipment position and estimation of weight gripping device load, initiation of crane equipment movements by operator and disconnection of equipment crane drives in case of overload. Before crane equipment position is determined, coordinates of obstacles on the site are memorized. Contours of obstacles are formed in the memory of processor and are represented on the display, and basing on the signals of crane equipment position sensors the coordinates of initial position of weight gripping device are determined, coordinates of final position of weight gripping device are set, then memorized and displayed. When crane operator initiates crane equipment movements, expected trajectory of weight gripping device is defined and displayed. If no contours cross, directions of crane equipment independent movements are determined, every one separately, for delivery of weight gripping device into the final destination point along the shortest route in the shortest time period, and in case of obstacles contours crossing by expected trajectory of weight gripping device movement, the optimal trajectory is determined, memorized and displayed. Movement of weight gripping device is done in loads bouncing suppression modes, overload crane protection and obstacles collision protection modes, under weight gripping device movement speed reduction with further braking and movements block. Device contains processors, "n" crane equipment position sensors, load detector, unit of obstacles coordinates setting and setter of final coordinates of weight gripping device, display, and drive control unit.

EFFECT: reduces dynamic loads and increases safety.

7 cl, 2 dwg

FIELD: mechanical engineering.

SUBSTANCE: invention relates to load-lifting and transportation equipment and it can be used in protection systems of load-lifting cranes. According to proposed method, tolerable loads are determined and memorized in form of function of spatial position of boom, measuring current value of load in process of operation of crane, comparing it with tolerable load and generating warning signal or signal to crane mechanisms aimed at limiting or preventing overload. In process of lifting and/or shifting of load, change of linear or angular position of crane part is revealed additionally whose change is not allowed in current stage of load lifting and/or shifting process. Depending on value of said change of position, additionally warning information signals or crane mechanism control signals are formed aimed either to prevent further increase in said change or to return said part of crane, for instance, boom, into initial position. Protection of crane from overload is implemented with due account both of absolute value and change of value of angle of tilting of crane component part from horizontal or vertical position in process of lifting and/or shifting of load.

EFFECT: improved safety of crane in operation.

21 cl, 1 dwg

FIELD: mechanical engineering; tower cranes.

SUBSTANCE: method includes periodical continuous polling during which signals are obtained, recorded and memorized which correspond to values of load characteristic of crane, crane geometry and operation conditions, obtained signals are compared with values of characteristics introduced into crane control system before its operation, and after comparing of signals received at polling with tolerable values of characteristics, if they exceed tolerable characteristics, commands of crane operator are cancelled. Introduced additionally into crane control system are parameters of crane operation conditions, speed of wind, ambient temperature and crane condition parameters, load, vibration, temperature of crane drive mechanism lubricants, and voltage in electrical devices. Maximum tolerable values of said parameters are introduced into control system to limit operation of crane drives at which operation of crane should be stopped or can be executed at introduction of definite limitations into operation of crane drive as to speed, accelerations, combined or successive travel motions of drives, obtained signals concerning operation and state of crane are compared with tolerable values, and possibility and conditions of execution of operator's commands are determined, command is left without changes or definite limitations are applied to operation of crane by introducing corresponding corrections to operator's command or execution of command is prohibited according to preset program.

EFFECT: improved safety of operation of tower crane.

1 dwg

FIELD: mechanical engineering; lifting and transportation machine building.

SUBSTANCE: invention can be used in control and protection system of load-lifting cranes. Proposed system contains load pickups 1, boom tilting angle pickups 5, parameters indicator 6 and series-connected tolerable load setting unit 8, comparator 9 and actuating unit 10 whose output is connected to first input of parameters recorder 11, unit to record designed values of parameters 12, correction unit 3, load weight check unit 2, scaling unit 4, variable coefficients unit 14, change-over switch 15, boom deflection recording unit 13 and boom reach calculating unit 7.

EFFECT: improved safety of crane owing to increased accuracy of control of its parameters.

2 cl, 2 dwg

FIELD: hoisting and transportation machinery, particularly to control and protect hoisting machines against overload.

SUBSTANCE: system comprises the first control means group installed on support structure or on equipment parts not to be separated from structure. The first control means group includes digital data processing unit 2 having output connected to executive and signaling device 4, 5 units, the first data input-output unit 3 linked to digital data processing unit with two-directional data exchange channel, crane 6 parameter sensors and power supply unit 1. Power supply unit 1 has one clamp connected to load-lifting machine body and another clamp secured to power supply system bus. The second control means group is supported by movable structure or equipment to be demounted and includes crane parameter sensors 10. The first and the second control means groups are linked one to another through two-directional radioline. The first control means group is provided with the first receiving/transmitting radio station, independent power source 15 and switchboard 16.

EFFECT: increased safety system reliability, simplified assemblage and installation thereof on load-lifting machine.

1 dwg

FIELD: mechanical engineering.

SUBSTANCE: invention relates to safety and control systems of load lifting cranes. Proposed method of supply of measuring and control component part of safety and control system arranged on boom or tackle block of load-lifting crane comes to use of self-contained supply source with automatic charging the source from generator - converter of mechanical energy of moving load or boom wire rope of load-lifting crane or block directing or supporting the wire, rope, into electric energy. According to invention, said component part of safety and control system of crane provides measuring of at least one operating parameter and control of loads, particularly, marker light and/or headlight. To charge self-contained supply source, in additional of wire rope motion energy, use can be made of energy of external mechanical actions, solar energy or heat energy of surrounding medium. Transmission of data between component parts of system can be provided by wireless data exchange channel.

EFFECT: facilitated maintenance, increased reliability, provision of serviceability of safety and control system of crane.

16 cl, 2 dwg

FIELD: mechanical engineering; material handling machinery.

SUBSTANCE: proposed method includes measuring or crane loads, traveling of crane with load and time of operation of crane mechanisms, recording of data and comparing them with normal characteristics of crane. In process o measurement, crane operating cycle is found. Beginning of cycle is determined by switching on any other mechanism after switching on load lifting mechanism at G>Gnl and L>Lnl where G is actual load from load on crane hook, Gnl is load at no load on crane hook, ZL is displacement of center of gravity of hook casing relative to center of gravity of load, Lnl is maximum tolerable displacement of center of gravity of hook casing relative to center of gravity of load. End of cycle is found by beginning of following cycle after execution of load lifting in case of no load on crane hook at G>Gnl and operation of any mechanism of horizontal displacement of load at L>Lnl. Simultaneously with determination of beginning and end of cycle, load G is measured at beginning of load lifting in period from moment of exceeding of load Gnl to moment of switching on any other load horizontal displacement mechanism. Current mean value of load is calculated within time interval Δt. Maximum value of current mean load is determined also within said period. Basing on maximum value of current mean load, mass of load is determined, and crane cycle with obtained mass of load is recorded. Then cycles with corresponding load masses are summed up. According to obtained data crane is classified to group of class, data obtained in each group of class are compared with normal characteristics of crane according to specifications and , basing of results on comparing, crane is placed in operation, or crane operator is warned or operation of crane is prohibited. Proposed device contains sensors of load and horizontal displacements, processing unit and comparing unit. Device includes also crane operation cycle revealing unit, cycle recording unit, load mass metering unit, AND and OR units and crane state evaluation unit.

EFFECT: provision of reliable data on conditions of crane, improved safety.

3 cl, 1 dwg

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