Roll stability control unit for chernetsky rail-tracked vehicle
SUBSTANCE: invention relates to machine engineering, namely to safety devices intended for keeping rail-tracked vehicles from turning. Roll stability control unit system in rail-tracked vehicle contains remote-mount lever fixed to the frame, moving element installed so that it can be displaced along the way of crane movement. The remote-mount level is provided with holes where guides are installed so that they can move. The said guides are rigidly fixed to the extension of slip hook axis and self-clamping lever. The spring is available between guides and rests upon the above-mentioned remote-mount lever and slip clip extension axis by its ends. The moving element is rigidly fixed to the extension of slip clip axis, while the lower levers of slip clip are implemented as polygonal line at an angle α between them. The sponges' surfaces having notches are rigidly fixed to the ends of slip clip low levers and parallel to the upper arms of the rail.
EFFECT: improved reliability in preventing rail-tracked vehicle turning and simplified design.
The invention relates to mechanical engineering, in particular to the safety devices designed to hold the rail vehicle from tipping over.
Known anti-theft rail grip (AU No. 1221187, B66C 9/18), containing two shoulders pinned levers on the end of a short lower arm of each of which has a groove into which is inserted to move the presser podrugina sponge with a notch, and the end of the long upper arm is kinematically connected with a drive rotation of levers, one side of the presser sponge is made with symmetrical longitudinal grooves for engagement with the springs, but the opposite L-shaped in plan surface mating with the inner surface of the groove.
The disadvantages of this device are:
1. The complexity of the design.
2. The clip is only the side faces of the rail, which reduces the reliability at the tipping point.
The closest analogue of the claimed device is a device to prevent tipping of the mobile crane (AU No. 1294759, B66C 23/88)containing fixed on the base frame of the crane remote lever with the driving element mounted for movement along the rail, located along the path of movement of the crane, remote lever hinged to the base frame, napravlyayus is made with limiters angular movements of the driving element in a vertical plane, and the device is provided with a hinge mounted on the base frame optional remote lever at the free end which is an additional driving element can be moved by an additional guide, hydraulic power cylinders, the piston rod of the first of which is connected pivotally with additional external lever and spring-loaded with respect to it, and the rod of the second main lever, the torque of the hydraulic cylinder through the valve, the movable element of which is pivotally connected with an additional remote lever and connected with a controlled input of an adjustable throttle through which communicated between a cavity of the second cylinder. The guide is made in the form of a channel, one of the shelves which is an additional guide. Guide installed at anchor.
The disadvantages of this device:
1. The complexity of the design.
2. Requires additional bulky and expensive equipment.
3. The complexity of the installation and configuration of the equipment.
4. Low reliability due to the inertia of the device.
The task of the invention is to increase reliability while simplifying the structure.
The problem is solved due to the fact that the device for preventing tipping of the rail vehicle containing fixed on the base frame remote growling is, driving element mounted for movement along the path of movement of the crane, with the extension arm has a hole in which is installed with the possibility of moving guides rigidly mounted on the continuation of the axis tick capture with self-locking levers, with installed between the guide spring resting with their ends on the remote lever and the axis tick capture and opposite spring rigidly attached to the continuation of the axis tick capture driving element, and the lower levers tick capture made in the form of a broken line with an angle α between them, while the surface of the sponges with notches rigidly attached to the lower ends of the levers tick capture are parallel to the upper shoulders of the rail.
Significant new features:
1. The extension arm has a hole in which is installed with the possibility of travel guides.
2. Guides rigidly mounted on the continuation of the axis tick capture with self-locking levers.
3. Between the rails installed spring resting with their ends on the remote lever and the axis tick capture.
4. On the contrary continue axis tick capture fixed chassis element.
5. The lower arms of tick capture made in the form of a broken line with an angle α between them.
6. The surface of the sponges with notches is estco attached to the ends of the lower levers tick capture, parallel to the upper shoulders of the rail.
These new significant features in conjunction with the known necessary and sufficient to achieve a technical result, in all cases to which the requested amount of legal protection.
The technical result is the reliability of the device due to the rapid operation of the device with the disengagement of the wheels of the rail vehicle and secure fit due to the fact that the spring allows you to keep a running element on the surface of the rail at the beginning of tipping. The mutual position of the parts immediately trigger tick capture, and the installation surface of the jaws with notches shoulders parallel to the top rail allows you to secure the movable means relative to the rail and to prevent tipping. Then tick capture returns to its original position. The simple design also increases the reliability of the device. The device does not require bulky and expensive equipment (channel, anchors, hydraulic equipment), the complexity of the installation and configuration of the equipment.
Figure 1 is schematically shows a device for preventing tipping of the rail vehicle. Figure 2 schematically shows a cross section along a-a, turned.
Device for preventing the disgust of the tilting rail vehicle includes a support frame 1, on which is rigidly mounted remote lever 2. Driving element consisting of a pin wheel 3 mounted on the rack 4, which is rigidly fixed to the continuation of the axis 5 of tick grip 6. Continue to the axis 5 of tick grip 6 is rigidly fixed to the two guides 7 can be moved through the openings 8 of the extension arm 2. Between the guide 7 installed spring 9, with their ends resting on the extension arm 2 and the axis 5 of tick grip 6. Contact wheel 3 with its surface rests on the rail 10. When this tick capture 6 consists of two rods 11 and the bottom two levers 12, made in the form of a broken line with an angle α between this broken line.
Thus, surfaces of the jaws with notches 13, rigidly attached to the lower ends of the levers 12 tick capture 6 are parallel to the upper shoulders 14 of the rail 10.
The device operates as follows.
In the initial position, the distance between the extension arm 2 and the continuation of the axis 5 of tick grip 6 is installed due to selection of the length of the rod 11 so that the surface of the jaws 13 with notch fixed on the lower arm 12 of tick capture 6, does not touch the top of the shoulders 14 of the rail 10. The spring 9 presses on the axis 5 of tick capture 6, thereby pressing the contact wheel 3 through a rack 4 to the surface of the rail 10.
In the case of the beginning of the La overturning the vehicle remote lever 2, rigidly fixed on the frame 1, is moved in a vertical plane above the surface of the rail 10 and continue axis 5 tick grip 6. Due to the force of the spring 9 guides 7 are moved in the holes 8 of the extension arm 2, thus the contact wheel 3 with a rack 4 remains in contact with the surface of the rail 10, and the axis 5 of tick capture 6 remains stationary relative to the surface of the rail 10. Because external lever 2 is moved upward thrust 11 compress the upper part of the tick's grip 6, and the lower portion of tick capture 6 sponges with notches 13 grasps the rail 10, thereby prevent tipping, because sponge with notches 13 are installed parallel to the upper shoulders 14 of the rail 10. Therefore, sponge with notches 13 communicate its surface with the top of the shoulders 14 of the rail 10, creating a secure fit.
When returning rolling means to the initial position of tick capture 6 unlocks the rail 10 by eliminating the interaction surfaces of the jaws 13 with the top of the shoulders 14 of the rail 10, as external lever 2 is returned to its original position and pushes the thrust 11. On the device it is possible to install sound and light alarm about the beginning of the overturning (moment of separation of the wheels of the rail vehicle from the surface of the rail).
Because pre-neizvesten is, in what direction will occur rollover, to prevent it you need to install the second is the same device across diagonally (in plan) of the vehicle relative to the first device.
Device to prevent tipping of the rail vehicle containing fixed on the base frame remote lever driving element mounted for movement along the path of movement of the crane, wherein the extension arm has a hole in which is installed with the possibility of moving guides rigidly mounted on the continuation of the axis tick capture with self-locking levers, with installed between the guide spring resting with their ends on the remote lever and the axis tick capture, while the opposite spring rigidly attached to the continuation of the axis tick capture driving element, and the lower levers tick capture made in the form of a broken line with an angle between them, while the surface of the sponges with notches rigidly mounted on the lower ends of the levers tick capture, parallel to the upper shoulders of the rail.
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.
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: 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