Weight-gripping accessory with limiter of weight bearing capacity
SUBSTANCE: weight-gripping accessory with limiter of weight-bearing capacity comprises link designed for suspension of weight-lifting facility onto weight-gripping element, and limiter of weight-bearing capacity is arranged in the form of body with units for suspension of slings and calibrated elastic element installed in body. Limiter includes hollow stem installed in body with head and threaded tail, on which adjusting nut is screwed, which contact with end of elastic element and having gap relative to lower end of body, between upper end of which and lower cut of stem head with the possibility of free rotation, driving element is put on stem, upper cut of which creates claw clutch with lower cut of stem head. In stem opening in the field of its head annular belt with thread is arranged, besides accessory is equipped with guidescrew, the end of which is fixed to link and screwed into threaded opening of stem, besides at free end of guidescrew, stop is installed, which has a possibility of contact with end of annular belt of stem.
EFFECT: provides for automatic limitation of lifting force.
The invention relates to a lifting-transport equipment, namely, removable lifting devices for lifting equipment used for maintenance, installation and dismantling a wide range of products, such as rocket technology.
It is known that during the mounting and dismantling for removal of goods with horizontal guides, such as nodes Metalworking machines, devices and units of missiles, it is necessary to ensure equality of lifting force to the weight of the cargo. To ensure such equality constraints lifting means (taps) is not possible, because the load capacity of cranes is always significantly more weight, lifting by crane.
To resolve this problem typically use signaling devices dynamometers that measure the lifting force hinged on lifting the body of the crane and attached to the upper link load-handling attachments. However, such devices do not guarantee ensure strict compliance lifting force weight due to the inability practically instant, to achieve the required lifting force, stop lifting mechanism of the crane, and do not exclude inconsistencies lifting force weight because of the mistakes of the operator (operator).
Problem is mA equality lifting force to the weight of the cargo is solved partly by using lifting device link regulating its length, in combination with a spring-stop, direct action (see N. Erofeev Safety and signaling devices", 2nd edition, Moscow: Mashinostroyeniye, 1970, Fig.20). The disadvantages of this device is its structural complexity, the lack of elements to adjust the limited effort and its relation to power equipment crane (via limit switch).
Known more simple load limiting device containing the cartridge with the bracket. One end of the sleeve is closed by a cover, which has tabs. With the other end in a sleeve screwed an adjusting nut for adjusting the compression force of the spring abutting against an end face of the guide node is placed in the sleeve and comprising two rings and two plates, connecting them, one of the plates has a profiled surface, the tabs which are designed to interact with the fixed core by dip switches. One of the rings has a hole for passage of the pins and rod.
The load limiting device attached to the crane hook. Raised by the crane load pulls on the rope, which is connected to the limiter and the load. The tensile force acts on the rod, moving it in the axial direction. Simultaneously with the rod, overcoming the spring force, moves the guide node, R is the result that the profiled surface of the plate presses the rods switches, including them, i.e. indicating the attainment of a predetermined load value, and disables the lifting mechanism of the crane in excess of its calculated values (see RF patent №2031075, CL VS 23/88, 1995) - the closest analogue.
The analysis of the structure of the known load limiting device is revealed that he is also associated with the electrical equipment of the crane during lifting generates an electrical signal to stop the drive of the lifting crane, but does not limit itself directly and automatically lifting force equal to the weight of the load.
The present invention is the creation of accessories with a load limiting device, automatically and directly limiting the lifting force equal to the weight of lifted load.
The problem is solved due to the fact that in lifting the device with a load limiting device that contains the link for hanging on a hook body, the sling and the load limiting device, the casing of which is fixed nodes to attach the straps, and inside is calibrated elastic element, the new element is that the casing is mounted a hollow shaft with a head and a threaded shank on which is screwed an adjusting nut in contact with the end face of the elastic element and having a gap relative to the bottom end to the pus, between the upper end of which and the bottom slice of the head stock with the possibility of free rotation is planted on the stem drive element, the upper section of which forms with the bottom cut of the head of coupling rod coupling, bore rod in area of his head made ring band with thread, and a device provided with a lead screw, the end sealed with a link, and is screwed in a threaded hole in the rod, the free end of the lead screw is a stopper, with the possibility of contact with the flange ring band stock.
When conducting patent research from the prior art is not identified solutions are identical for our purposes, and therefore, the claimed invention meets the eligibility condition of "novelty."
The essence of the claimed invention is not obvious from the solutions known from the technical level, and therefore, the claimed invention meets the eligibility condition of "inventive step".
The information set forth in the application materials is sufficient for the practical implementation of the claimed invention.
The essence of the claimed invention is illustrated graphic materials, in which:
figure 1 is a diagram of fixtures, General view;
figure 2 - location I of figure 1.
Lifting device with a load limiting device content is t link 1, designed for hanging on a hook body lifting means (for example, the crane hook). On link 1 is fixed by the end of the lead screw 2. The screw 2 is placed the load limiting device 3 with eyelets for fastening straps 4, the ends of which are attached to the cargo.
The load limiting device 3 is made in the form of a casing 5, which is fixed to the nodes 6 for fastening straps 4, made for example in the form of eyelets. In the case of 5 posted elastic element (spring) 7 and the hollow rod 8 with a threaded shank on which is screwed an adjusting nut 9 and a head 10 with a flat bottom cut.
The rod 8 is made hollow in the upper part of the cavity, in the region of the head on the rod threaded the belt, which rod is screwed on the lead screw 2.
Between the bottom slice of the head 10 and the upper end of the body 5 on the rod 8 is freely rotatably carried by the hub 11 of the actuator 12 (e.g., steering wheel). Stroke 8 relative to the lead screw 2 is limited by the stopper 13, mounted on the pilot screw 2.
It should be noted that it is very important that the bottom end of the head 10 of the piston rod is made in the form of a coupling half-coupling (friction or Cam). The second coupling half is made on the upper face of the hub 11. Interacting with each other, the coupling halves form a coupling, which connects the stem and the actuator 12 or separates them, e is whether the coupling is not in contact with each other.
The elastic element 7 calibrated to ensure efforts preload, equal to the weight of the lifted load, the calibration it is carried out by moving the adjusting nut 9 threaded on the shank of the rod 8. Between the lower end of the body 5 and the end face 14 of the nut 9 installing shims 15 are provided, the clearance "h"is necessary and sufficient to guarantee separation of the coupling coupling coupling (heads 10 and hub 11). After you install the necessary clearance "h" nut 9 kantrida on the shank of the rod 8 of the stopper 16.
Structurally coupling the coupling can be implemented in various ways, for example, in the form of a friction ring (2)placed between the ends of the head 10 and the hub 11.
Lifting device with a load limiting device operates as follows.
Vivencial lead screw 2 of the hollow rod 8 to lock the stopper 13 in the threaded end of the tie rod 8. Link 1 hang on the hook of the crane. The lower links 4 slings attached to the lifting points on the load. The lifting mechanism of the crane move up a level 1 with a load limiting device, picking up the slack slings, but not pulling them.
Rotate the wheel 12 and through a closed coupling coupling result in rotation of the rod 8, with the result that he screwed on the screw 2 and moves up mounted thereon an adjusting nut 9, the elastic is element 7 and the housing 5, that leads to tension straps 4.
Upon reaching the total tension of the straps, equal to the weight of the lifted load, move up the housing 5 is stopped, and during the continued rotation of the wheel 12 will nevinovate of the screw 2 and move up only a rod 8 with a nut 9 (within the gap (h), resulting in the head 10, the lower section of which is a coupling coupling coupling, moves up, over the hub 11 (second half-coupling), and the clutch is opened. By disconnecting the clutch rotation of the stem 8 and, consequently, move it to screw up 2 stops that automatically helps limit the tension of the straps, that is, the lifting force. The weight of the cargo is perceived slings and almost not transmitted to the support, which is a load (e.g., guides), causing the cargo can be freely displaced and removed.
The use of this device allows to significantly simplify the work on the removal of various products with horizontal guides, in particular when removing devices from missiles when carrying out maintenance work, and to prevent this damage to the goods (cargo), and the rails on which they are installed.
Lifting device with a load limiting device that contains the link for hanging on lifting the body of gruzopodyemnye the th means, slings and load limiting device on the housing, which are the sites for attachment of slings, and the case contains a calibrated elastic element, characterized in that the housing is mounted a hollow shaft with a head and a threaded shank on which is screwed an adjusting nut in contact with the end face of the elastic element and having a gap relative to the lower end of the body, between the upper end of which and the bottom slice of the head stock with the possibility of free rotation is planted on the stem drive element, the upper section of which forms with the bottom cut of the head of coupling rod coupling, bore rod in area of his head made ring band with thread, moreover, the device is provided with a lead screw, the end sealed with a link, and is screwed in a threaded hole in the rod, the free end of the lead screw is a stopper, with the possibility of contact with the flange ring band stock.
SUBSTANCE: proposed control system contains the onboard microprocessor control unit with actuators connected thereto, crane operating parameters pickups and controls. The proposed system incorporates means identifying lifted and moved cargo representing a reader of bar codes applied on the cargo, or a radiolabel attached to the cargo, to allow locking the cargo, exceeding the crane lifting capacity, lift and move. The system can contain cargo position pickups to automatically guide the tool to be clamped to the cargo. In compliance with the second version, manual input of the identifier or cargo parameters into this system, and, if required, the coordinates of a final point cargo transfer cargo. Note here that the system incorporates appropriate means preventing the crane overload and optimising cargo transfer trajectories. In compliance with the third version of the control system, the said system can block releasing the cargo from the clamping tool depending on current value of the crane load, speed of move and/or spatial position. In compliance with the fourth version, the control system is equipped with wire or wireless means of transmitting signals from a person, outside the load-lifting crane, to the onboard microprocessor control unit for them to be converted into warning light and/or sound data signals and/or to signals blocking the crane motion.
EFFECT: increase in safety of crane operation, its efficiency and ease of control.
24 cl, 1 dwg
SUBSTANCE: method envisages preliminary determining or setting of admissible values of parameters characterising loading and/or attitude position of outrigger or crane cargo-handling device, memorising this data, measuring of these parameters during crane operation, comparing of measured values with admissible values, and further forming of control signals or blocking of control by execution units in order to prevent exceeding of admissible values. Prior to commencement of crane work or in process of lifting and movement of cargoes crane-operator additionally performs preliminary visual control of crane operation condition or presence of people along way of crane or cargo movement or automatic control of correctness of slinging (securing) of cargo, or automatic check of correctness of crane installation on outriggers or optical measurement of crane performance parameters or automatic change of coordinate parity parameters using GPS receivers, radio-frequency or inertial determination of position devices located on obstacles, clothing or equipment of people. Results of this check or control ensue implementation of additional control or information signals.
EFFECT: enhancement of safety of crane operation and of crane efficiency.
24 cl, 1 dwg
SUBSTANCE: system contains hydraulic, electrohydraulic and/or electric drives of crane mechanisms, control device for these drives, and fuel supply control device connected to it. In process of crane operation automatic fuel supply change is performed depending on load position and/or speed of cargo relocation. In second version of system fuel supply change is automatically related to approach or touch of crane operator's hand to drive control handle. Drive control is made as control unit containing control handle, handle position sensor, and controller with outputs connected immediately, or via additional output device, to control drives' inputs and to device controlling fuel supply. Level of fuel supply in general case is different for different drives and directions of crane movement. After handles of crane drive control are returned to neutral position or after hands are removed from handles, value of motor angular velocity is preserved within preset interval after which minimum preset velocity of motor blank cycle is automatically established.
EFFECT: decrease of specific fuel consumption, efficiency increase, enhancement of usability of crane control and of safety of its operation.
17 cl, 2 dwg
SUBSTANCE: system contains electronic module made on basis of microcontroller with attached device for information input-output, display device, protection system controls located outside electronic module, and execution unit, and cargo-hoisting machine performance sensors connected with device for information input-output. Protection system controls and electronic module perform changing type of display of machine performance indicators and changes in both parameters and performance mode of work of machine protection system - scheduling sequence of telescopic boom sections extension, permitting/forbidding lifting operations mix, release of blocking of movement of cargo-hoisting machine in respect of overload and , blocking of cushioning of machine carrier, cargo-hoisting mechanism mode of braking, or boom extension change, position of bracing jack, etc. Display device may be located outside electronic module and it is made as graphic display.
EFFECT: safety enhancement.
13 cl, 1 dwg
FIELD: physics; transportation.
SUBSTANCE: proposed device comprises an information processing and signal generating device, which is connected to a capacitive, inductive or ultrasonic primary detector, put onto a holder and linked to runners. The detector comprises transmitting and receiving elements, connected to a generator and to an amplifying converter device, comprising an analogue-to-digital converter, microcontroller and a wired or wireless interface device, and is part of the information processing and signal generating device. The device can also have a detector for the inclination angle of the rope.
EFFECT: wider range of external conditions for operation of the device, tolerance to vibration action, simple servicing, increased efficiency, and wider functional capabilities of the device.
7 cl, 3 dwg
SUBSTANCE: crane protection system contains working conditions transmitters, actuator and data-control unit made on the base of microcontroller with possibility of wire or wireless connecting to it above mentioned transmitters and actuator and with possibility for actuator to generate control signals aimed to prevent working conditions to exceed their permitted values. In the system parameter is revealed for which permitted value exceeding is the most probable at current time, whereupon priority limiting of this parameter value. To do so, the main load carrying member of crane is determined or inhibition of it's stability under working conditions margin is revealed. In the second version of protection system, warning, detection and/or correction of operator wrong actions during setting parameters for jib equipment and/or support contour is performed. In the third system version, changing of permitted values for crane operation parameters is provisioned depending on error of used transmitters.
EFFECT: improvement of operation safety for lifting crane; reducing the value of its travels after achieving the rating value for any parameter and blocking the crane movements by protection system; increase of this system reliability and reduction of requirement to transmitters accuracy.
25 cl, 1 dwg
SUBSTANCE: invention relates to handling machinery and can be used in the systems of control and protection of climbing cranes. The safety system incorporates digital computing unit (1) with its data inputs receiving, via a data exchange multiplexer channel, the outputs of the crane parameter recording peripherals (71...7m) comprising, at least, one crane equipment travel pickup, and with outputs wired to crane parameter recorder (3) with real-time counter, display unit (4), preventive signaling unit (5), actuator (6) and external memory (2) communicating, via a two-way data exchange channel, with the digital computing unit. The system comprises, at least, one indicator (8) of the crane equipment crossing of, at least, one check point within the crane operating range, the said indicator being connected to the digital computing unit additional data input adapted to correct the crane equipment travel pickup readings in compliance with the signals generated by the aforesaid indicator.
EFFECT: higher reliability of the crane coordinate protection system operation.
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
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.
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.
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
FIELD: mechanical engineering; materials handling machinery.
SUBSTANCE: invention relates to safety engineering of load-lifting machines. Proposed method includes supply of current to drives of mechanisms and safety equipment, switching on drive of at least one mechanism of crane, switching off and braking, all operations being performed from cabin. Power supply to mechanism drives in emergency in cut off from ground or base on which crane is installed. Then supply of crane mechanism providing change of crane from dangerous position into safe position is carried out from said base. Then mechanism is released, its drive is actuated and crane is brought into safe position by means of additional control panel. Proposed device contains control panel arranged in crane cabin and safety device, such as external load setter with electric input and output, emergency sensor and crane mechanism drive supply pushbutton. Moreover, device is furnished with additional control panel on running gear in place easy to get at from base. Additional control panel is connected with main panel through output of external load setter and by means of additional feedback, and it has key-mark and additional switch. Drive of crane mechanism is connected with additional panel, key-mark is made removable, being installed in additional panel to interact with additional switch.
EFFECT: improved safety of tower crane in operation.
3 cl, 2 dwg
FIELD: materials handling facilities; tower cranes.
SUBSTANCE: according to production plan, zones with different types of crane movement limits related to concrete objects are defined. Said zones are introduced into personal computer, not included into instrument complex of coordinate protection, under laboratory conditions. Using special software, array of data is formed in computer, each element of which corresponds to building site member and contains information of prohibited movement of crane in corresponding point. Said array is recorded in reprogrammable read-only memory of coordinate protection system which, basing on signals from transmitters, defining position of crane and its members and by signals from reprogrammable read-only memory forms drive locking signals if crane or its working members get into restricted zone.
EFFECT: provision of crane coordinate protection of high efficiency using simple devices.
3 cl, 1 dwg
FIELD: mechanical engineering.
SUBSTANCE: invention can be used in control systems of load-lifting cranes. Proposed method and safety system provides realization of noncontact (wireless) communication between separate module (electronic units and pickups of boom tilting angle and length, force and pressure, azimuth, etc) of load-lifting crane safety system. For this purpose electric signals with serial code are converted into radiation (ultrasound, radio signal or optical radiation and said radiation is transmitted to receiving station. Transmission and reception of radiation is effected periodically by setting reception and transmission periods corresponding to required response of load-lifting crane safety system. Speed of change of operating parameters of crane and position of its load-lifting equipment are checked additionally, and at increase of speed, automatic decrease of crane operating parameters and position of its load-lifting equipment is done and automatic decrease of radiation transmission periods is provided. Safety system modules are furnished additionally with radiation transmitters and receivers (ultrasound, radio frequency or optical radiation ones) whose input and outputs are connected with outputs of forming units and inputs of reception units of serial digital signals. Serial digital signal forming units are made for periodical forming of said signals.
EFFECT: improved reliability of safety system and facilitated servicing.
6 cl, 1 dwg
FIELD: materials handling equipment.
SUBSTANCE: invention relates to methods of protection of boom load-lifting cranes and pipelayer cranes from overloads and damage. Adjustment is carried out by lifting calibrated load of preset mass in points of load characteristic with known parameters of boom equipment and regulating signals in load, reach and/or boom tilt angle measuring channels to provide correspondence of safeguard characteristic to preset load characteristic of crane. In process of regulation of signals in load, reach and/or boom tilt angle measuring channels, values of output signals of corresponding sensors are kept constant and regulation is done by adding and/or multiplying output signals from sensors and signals corresponding to adjusting parameters. Values of the latter are preliminarily determined and kept in nonvolatile memory of safeguard.
EFFECT: reduced labor input in adjustment of safeguard on load-lifting crane, provision of interchangeability of all components, possibility of adjustment of device on any type of load-lifting crane with unspecified mounting of load sensor.
6 cl, 2 dwg
FIELD: mechanical engineering; boom cranes.
SUBSTANCE: method relates to control and protection of load-lifting facilities from overloads and damage. According to proposed methods, at least one of working parameters is measured and, if necessary, said parameter is processed in real time according to preset procedure. Indication of working parameter and its comparing with tolerable value, forming of signal to interlock operation of load-lifting mechanism and sending of signal to actuating device if working parameter exceeds tolerable value are provided. Value of working parameter and interlock signal and time of their appearance are recorded in nonvolatile memory for reading in case of necessity. Prior to beginning of operation of load-lifting mechanism, additional interlock signal is formed and said signal is transmitted to actuating device. Moreover, biometric data of operator of load-lifting mechanism are read off which are recorded, together with time of reading, in nonvolatile memory for keeping and reading off in case of necessity. After reading off of biometric data of operator, additional interlock signal of load-lifting mechanism is cut off. Device for implementing the method contains microprocessor calculator, control module, data input/output module, memory module, indication module, actuation module and working parameters sensors. Real time module and biometric data read off module are introduced additionally into device. Microprocessor calculation is made to form additional interlock signal of load-lifting mechanism at switching on overload safeguard of load-lifting mechanism and switching off of its in case of presence of output signal from biometric data read module.
EFFECT: increased efficiency of protection of load-lifting mechanism.
20 cl, 1 dwg
FIELD: mechanical engineering; loading-lifting cranes.
SUBSTANCE: proposed group of inventions relates to controls and safeguards of load-lifting cranes. Method provides measuring and/or checking operating parameters of load-lifting crane characterizing load, geometry, conditions or modes of operation and conversion of measured and/or checked parameters into serial code and their transmission by multiplexed communication line with addition of identification or address of module. At least in one module at least two operating parameters of load-lifting cranes are measured and/or checked and converted into serial code, combined reception and combined transmission of serial digital signals by multiplexed communication line with use of one identification or address of module are provided. System implementing the method contains at least two separate modules being electronic units and/or transducers, for instance, control and indication units, boom tilting angle and length transducers, force or pressure transducers. At least two of them are connected through multiplexed communication line. Each of combined modules contains microcontroller, driver or transceivers and information measurement or information control circuit, made for measuring and/or checking operating parameter of load-lifting crane. Outputs of said circuit are connected with inputs of microcontroller, and one of primary converters of operating parameters of load-lifting crane is connected to its input. Microcontroller is made for reception, processing and transmission of serial digital signals, its inputs/outputs being connected through driver of transceiver with multiplexed communication line. In at least one of modules at least one of primary converters of operating parameters of load-lifting crane is connected to input of information measurement or information control circuit in addition. Said circuit of module is made for measuring and/or checking of at least two measured and/or checked operating parameters of load-lifting crane, and microcontroller is made for combined reception, combined processing and combined transmission of serial digital signals by multiplexed communication line with use of one identificator or address of module.
EFFECT: improved reliability of protection of load-lifting crane owing to high-speed response and accuracy of operation of safety system.
9 cl, 1 dwg
FIELD: material handling facilities.
SUBSTANCE: according to first design version, two sensors are placed additionally on fixed part of crane. They are shifted relative to each other through quarter of revolution to provide forming of two additional electric stresses. All sensors are magnetically sensitive ones and are acted upon by Earth's magnetic field. Angle between fixed part of crane and Earth's magnetic field is determined by processing additional electric stresses. Actual value of azimuth angle is determined as difference in angular positions of fixed and slewing parts of crane relative to Earth's magnetic field. Device uses tow additional sensors shifted through quarter of revolution whose inputs are connected to supply source, and outputs, to additional inputs of measuring circuit. All sensors in device are made magnetically sensitive with possibility of measuring Earth's magnetic field. According to second design version, actual value of azimuth angle is determined as difference between angular position of crane slewing part and direction of crane track.
EFFECT: facilitated measurement of crane azimuth angle, simplified device for implementing the method.
4 cl, 1 dwg
FIELD: mechanical engineering; load-lifting cranes.
SUBSTANCE: invention relates to control and protection of load-lifting cranes. Method provides forming of image of working process, checking of position of load-gripping member or load in process of crane operation, and forming of control signal by at least one of crane actuating devices basing on results of checking. Said checking is provided by microprocessor calculator by processing and analyzing the image, as a result of which distance from load-gripping member or load to object or obstacle or to human in working zone of load-lifting crane is determined. Revealed distance is compared with set minimum threshold level. Then warning signal is shaped automatically, or control signal to operate actuating device and prevent movement of load-gripping member or load towards object, obstacle or human.
EFFECT: improved safety of crane in operation with due account of overall dimensions of lifted load and operation of slingmen.
10 cl, 1 dwg
FIELD: mechanical engineering; load-lifting facilities.
SUBSTANCE: invention relates to method of control and overload protection of boom load-lifting cranes. According to proposed method, tolerable load acting onto boom in longitudinal-vertical plane is determined at designing of crane and is recorded. In process of operation of crane, in case of necessity parameter characterizing current load on boom in longitudinal-vertical plane is measured, and if necessary, changed. Then current load on boom is compared with recorded tolerable one, and signal is shaped to control mechanisms of crane depending on results of comparison. Tolerable value of cross load on boom or twisting load of boom or parameter depending on such load is determined additionally by calculation at designing the crane, and said value is recorded. In process of operation of crane parameter characterizing current cross load on crane boom or boom twisting load is additionally measured and, if necessary, converted. Then tolerable value is compared with current value additionally, and signals to control crane mechanisms are formed. Used as parameter characterizing current cross load on boom or boom twisting load is cross deformation of crane boom or deviation of value of force or torque in crane turning mechanism from nominal value, or difference in forces in horizontally spaced boom wire ropes, or twisting deformation of crane boom, or angle of tilting of boom head in cross plane relative to gravitational vertical or crane slewing platform.
EFFECT: provision of complex overload protection of crane by load torque, cross bend or boom twist.
9 cl, 2 dwg