Device for measurement of load-lifting mechanism cable tension (versions)

FIELD: transportation.

SUBSTANCE: device contains the base and the force pickup attached thereto, two support elements and the deformable element connecting free ends of the support elements and attached, by its central part, to force pickup. The device additionally contains the electronic device made to compare the force pickup output signal with that corresponding to the maximal lifting capacity of the mechanism, and to generate the signal to lock its operation, and/or a warning light and/or sound signal depending on results of this comparison. The device, a second version, contains the force pickup, two support elements and two deformable elements jointing the support elements. The force pickup is attached to the central parts of deformable elements. One deformable element is made either elastic or in the form of rigid parts with elastic hinges.

EFFECT: higher safety in operation of the load-lifting mechanism and accuracy of measurement of the cable tension.

12 cl, 3 dwg

 

The invention relates to control operating parameters of the load-lifting mechanisms and can be used in devices for overload protection.

A device for measuring the tension of the lifting mechanism, containing a frame with a base rollers, around cargo rope, and witness the deflecting roller interacting with the force sensor. In deflecting roller mounted bushing with screw interacting with the force sensor [1].

When changing the tensile forces in the rope he wants to take the straight-ahead position between the base rollers, moving the deflecting roller acting on the force sensor. By adjusting the deflection of the rope by means of the screw is a change gear ratio of the tension force of the rope on the force sensor and, accordingly, is the tincture of the device in operation on the lifting mechanism.

A disadvantage of this device is the low accuracy of the measurement efforts, increased the complexity of the settings on the lifting mechanism and the need to reconfigure the unit when moving to another place of rope. This is because the strands of a rope lay in the oval cutouts rollers arbitrarily. The rope may lie on one strand or two strands, which leads to a change of the angle of deflection of the rope, which determines the force acting on the force sensor. With the weakening and subsequent tensioning of the rope during operation of the lifting mechanism strands can be rotated and the angle of deflection of the rope will change. This leads to measurement errors rope tension and the need for additional adjustment device on the lifting mechanism to compensate for the changing angle of deflection.

The closest to the invention is a device for measuring the tension of the hoist rope hoisting mechanism containing the base and attached ilovepinews mechanism with a force sensor. Ilovepinews mechanism made in the form, i.e. including attached to the base of the two inclined rod (support element), an articulated duosonic (deformable element, connecting the free ends of inclined rods, and a Central part, forming the deflection articulated dusenyka. The Central link is attached to the middle joint of dusenyka and to the base through the mechanism for moving the end of the Central element, and the force sensor is integrated in the Central link. Inclined rods attached to the base via an elastic hinge, and mechanism for moving the end of the Central link contains a screw pair, which includes the threaded Nakonechny and nut, based on the base [2].

The formation of the deflection of this device without rope provides independent measurements of the tension on the characteristics and the spatial position of the rope, but does not eliminate the disadvantages of the device is reduced safe operation of the lifting mechanism and the low accuracy of the measurement of the tension force of the rope.

Reduced security due to the presence of joints in the elements forming the cantilever deflection. When their accidental separation of the accident occurs lifting mechanism, accompanied by a fall of lifted cargo or arrows (depending on how the rope is built this device).

The reason for the low accuracy of measurement of the tension force of the rope is the use of articulated dusenyka for forming deflection of. When you change the tension of the rope should be proportional to the change efforts transferred from the middle hinge of dusenyka on the force sensor embedded in the Central link. This requires mutual micromovings links of dusenyka, which prevent friction in the hinges. These forces cause the hysteresis in the transfer characteristic tension on the force sensor and, accordingly predetermine the low accuracy of the measurement of the tension force Kahn is the same.

The technical result, which directed the claimed invention, is to increase the safety of the lifting mechanism by preventing accidents caused by accidental disengagement of the hinge elements forming the cantilever deflection (in deformable elements).

Other technical result of the invention is to improve the accuracy of measuring the tension force of the rope while maintaining the secure operation of the lifting mechanism in case of destruction of the force sensor.

In the first variant of the device for measuring the tension force of the rope hoisting mechanism containing the base and attached to the force sensor and two of the support element, and a deformable element connecting the free ends of the support members and attached to the middle part of the force sensor, the above technical result is achieved by the fact that the deformable element is made of elastic or rigid links with elastic hinges. While the supporting elements, in particular, attached to the base and/or deformable element using the elastic hinges.

In the second variant of this device, containing a force sensor and two of the support element, and a deformable element connecting the support members and attached to the middle part of the sensor at the Elijah these technical results are achieved by the fact that they added a second deformable element connecting the support members and attached to its middle part to the free end of the force sensor. At least one deformable element is made of elastic or rigid links with elastic hinges.

In any version of the proposed device, the force sensor and/or at least one of the elements of the mount may further comprise a mechanism for changing the deflection of the deformable element (deformable elements)made, in particular in the form of a mechanism for changing the length of each screw comprising a threaded tip and cooperating nut.

In the second variant of the device, the mechanism of change of deflection can be embedded, at least one supporting element and is designed as a mechanism for changing the distance between the points of joining of deformable elements. This mechanism can be a screw pair.

In addition, to achieve these technical results, the proposed device in any case its execution may further comprise an electronic device that is connected by its input to an output of the force sensor and configured to compare the output signal of this sensor with the signal that is suitable is the maximum capacity of the mechanism, and signal blocking its work and/or a warning light and/or sound signal depending on the results of this comparison.

Thanks to the implementation of these distinguishing features, the proposed device is independent of the measurement of the tension force of the rope from the values of the friction forces at the nodes of this device that provides improved measurement accuracy.

Accidental destruction of the force sensor, as the weakest link of the device, the load rope perceives deformable element (deformable elements). This does not lead to the liberation of the rope and therefore failure of the lifting mechanism (to drop cargo, arrows etc).

The absence of joints in the deformable elements of the device leads to the impossibility of their separation - random loss of cotter pins, axes, etc. Respectively, eliminates the possibility of accidental release of the rope leading to the accident of the lifting mechanism.

Therefore, features of the device are in direct causal relationship with achievable technical results. In the prior art, the existence of such relationships is unknown.

1 schematically shows an example implementation of the device with a deformable element, figure 2 - two deformable elements and the sensor is m efforts working on stretching in figure 3 - with two deformable elements and the force sensor, working in compression.

Device for measuring the tension force of the rope of the hoisting mechanism in the first version of its execution (figure 1) comprises a base 1 and connected to the force sensor 2, for example, strain gauge, two support elements 3, 4, and a deformable element 5 connecting the free ends of the support elements 3, 4.

Device in the second embodiment, (2, 3) contains a force sensor 2, two support elements 3, 4 and two deformable element 5, 6 connecting the supporting elements 3, 4.

Force sensor 2 is attached to the middle part of the deformable element 5 and either to the base 1 (Fig 1), or to the middle part of the second deformable element 6 (2, 3).

Deformable elements 5 and 6 are made of an elastic, for example, in the form of single or multiple strips of spring steel. They can be made also in the form of a rigid links (thickening of vacant parcels deformable element, for example, steel plates with elastic hinges, made, in particular, likewise in the form of strips of spring steel, connecting these links.

The supporting elements 3, 4 are attached to the base 1 and/or deformable elements 5, 6 mainly with elastic joints (flexible spring elements). Prob is should also attach with hinges with bearings or antifriction bearings.

Any variant of the device for controlling the gear ratio of the efforts of the rope 7 on the force sensor 2, the sensor and/or at least one of the elements of the mount may further comprise a mechanism to change the deflection of the deformable element (deformable elements). As such a mechanism can be used screw pair, which includes a threaded tip 8 and interacts with the nut 9.

In the second variant of the device, the mechanism of change of deflection can be embedded, at least one supporting element 3, 4 and is designed as a mechanism for changing the distance between the points of joining of deformable elements 5, 6. This mechanism can be a screw pair. (In the drawings conventionally not shown).

The device may further comprise an electronic device implemented on the basis of a microcontroller, coupled with its input to an output of the force sensor 2 and is arranged to compare the output signal of the force sensor signal corresponding to the maximum capacity of the mechanism, and the signal blocking its work depending on the results of this comparison. To provide this capability, an electronic device comprises a strain gauge amplifier connected between the output of the force sensor 2 and whodo the analog-to-digital Converter of the microcontroller, and power electronic switch, the control input of which is connected to the output of the microcontroller. The electronic device may be placed in the body of the force sensor 2, or made as a separate unit.

The supporting elements 3, 4 and/or deformable elements 5, 6 on the one hand attached to the cargo or stranovomu rope 7 of the lifting mechanism, and with the other hand to a stationary structural member of this mechanism. In General, these compounds to avoid uncontrolled effects on deformable elements 5, 6, are movable, in particular, with the use of bearings series SHS.

When the lifting mechanism, the tension force P of the rope 7 is transmitted to the deformable elements 5, 6. Under the influence of this effort deformable elements 5, 6 are eager to take rectilinear shape, which leads to efforts at the sensor 2, the value of which depends on the deflection of the deformable elements, defined by the angle α (Fig.1 - 3).

In the embodiments shown in figures 1 and 2, use the force sensor 2, working in tension. The device can also be used in sensor 2, working in compression. In this case, the deflection of the deformable elements 5, 6 is in the opposite direction (figure 3).

After lifting of the reference load device is to regulate the Finance transfer coefficient efforts rope 7 on the force sensor 2. With this purpose, by means of spiral pairs 8, 9 are changing the deflection of the deformable element (deformable elements) - the value of the angle αand, before reaching the output signal of the force sensor 2 value corresponding to the reference weight of the cargo.

During operation of the lifting mechanism, the signal from the force sensor 2, is proportional to the tension force of the rope is passed on any register, indicator, or an information control device in order to use this signal in the control system, protection and/or control of the lifting mechanism.

In the case of the destruction of the force sensor 2, for any reason, the deformable element 5 (or deformable elements 5, 6) continue to perceive the force P of the rope 7. Fixed branch of the rope remains fixed. Because of this, the force P support cargo or support boom retains its value and the accident of the lifting mechanism does not occur.

Implementation of deformable elements 5, 6 whole excludes the possibility of their accidental separation (for example, due to loss of the axes of the hinges), which also provides increased safety of operation of the lifting mechanism. This also contributes to the application of the second variant of the device (figure 2, 3) two deformable elements 5 and 6, providing redundancy of the power circuit of the device is STV.

To further improve the safety of the lifting mechanism in the device can be implemented protection features of the lifting mechanism from overload. In this case, the output of the force sensor 2 is additionally connected electronic device based on a microcontroller. In this device the output signal of the force sensor 2 after amplification is fed to the input of analog-to-digital Converter of the microcontroller. The microcontroller generates a signal to control the power electronic switch, the output of which is connected with an actuating device of the lifting mechanism with the valve or the electromagnetic actuator blocking movement of the lifting mechanism.

The microcontroller of the electronic unit compares the enhanced output signal of the force sensor 2 signal corresponding to the maximum capacity of the mechanism and the pre-recorded in the memory of the microcontroller, and generates a signal to control the power key depending on the results of this comparison. In the end, is the protection of the lifting mechanism from overload.

Optionally, the electronic device may also be light and/or audible indication of the load level and its registration in the non-volatile storage device.

From the presentation is tion should in the described device, thanks to the implementation of its distinguishing characteristics is increased as the secure operation of the lifting mechanism and the accuracy of the measurement of the tension force of his rope.

Sources of information

1. SU, ed. St. 436790, CL 66 With 23/88, 25.07.1974.

2. EN 48060 U1, class G 01 L 5/00, 66 15/00, 66 In 5/12, 10.09.2005 (h-ka invention EN 2005116284/11, (01866), CL In 66 15/00, 23/88, 30.05.2005, the decision to grant dated 15.06.2006).

1. Device for measuring the tension force of the rope hoisting mechanism containing the base and attached to the force sensor and two of the support element, and a deformable element connecting the free ends of the support members and attached to the middle part of the force sensor, characterized in that it further comprises an electronic device that is connected to its input with the output of the force sensor and configured to compare the output signal of the sensor signal corresponding to the maximum capacity of the mechanism, and the signal blocking its work and/or a warning light and/or sound signal depending on the results of this comparison.

2. The device according to claim 1, characterized in that the deformable element is made of elastic or rigid links with elastic hinges.

3. The device according to claim 1, characterized in, Thu the force sensor and/or, at least one element of its fastening further comprises a mechanism for changing the deflection of the deformable element.

4. The device according to claim 3, characterized in that the mechanism of change of the deflection is made in the form of a mechanism for changing the length of the force sensor and/or at least one element of its fastening and contains a screw pair, which includes a threaded tip and cooperating nut.

5. Device according to any one of claims 1 to 3, characterized in that the supporting elements attached to the base and/or deformable element using the elastic hinges.

6. Device for measuring the tension force of the rope hoisting mechanism containing a force sensor and two of the support element, and a deformable element connecting the support members and attached to the middle part of the force sensor, characterized in that it additionally introduced the second deformable element connecting the support members and attached to its middle part to the free end of the force sensor.

7. The device according to claim 6, characterized in that at least one deformable element is made of elastic or rigid links with elastic hinges.

8. The device according to claim 6 or 7, characterized in that it further comprises a mechanism for changing the deflection of the deformable elements.

9. The device according to claim 8, from causesa fact, what is the mechanism of change of deflection of the deformable elements are in the form of mechanism to change the length of the force sensor and/or at least one element of its fastening and contains a screw pair, which includes a threaded tip and cooperating nut.

10. The device according to claim 8, characterized in that the mechanism of change of deflection of the deformable elements are embedded, at least one supporting element and is designed as a mechanism for changing the distance between the points of joining of deformable elements.

11. The device according to claim 10, characterized in that the mechanism changes the distance made in the form of a screw pair.

12. Device according to any one of p, 7, 9, 10 or 11, characterized in that it further comprises an electronic device that is connected to its input with the output of the force sensor and configured to compare the output signal of the force sensor signal corresponding to the maximum capacity of the mechanism, and the signal blocking its work and/or a warning light and/or sound signal depending on the results of this comparison.



 

Same patents:

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 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: 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; load-lifting cranes.

SUBSTANCE: invention can be used in control and protection system of load lifting cranes to preclude overloads and damage in crane mechanisms. Proposed system consists of separate parts made in form of at least one electronic unit and pickups measuring parameters of load-lifting crane. To supply electronic circuit of any component of safety system use is made of self-contained supply source which is constantly or periodically charged. Conversion of mechanical energy of load or boom rope, or energy of measured parameter of operation of load-lifting crane, mechanical energy of measured load in boom or load rope, angle of azimuth length of boom, etc or hydraulic energy of measured pressure in hydraulic cylinder or in hydraulic boom lifting/lowering motor, load-gripping member or slewing platform of load-lifting crane or energy of external mechanical, acoustic or heat ambient medium onto parameter pickup of load lifting crane into electric energy is provided.

EFFECT: simplified servicing, improved reliability, provision of serviceability of safety system at cut off supply.

23 cl, 1 dwg

FIELD: materials handling facilities; crane safeguards.

SUBSTANCE: invention relates to overload and damage protection of load-lifting cranes and cranes-pipelayers. Proposed method comes to adjusting at least one signal in at least one load measuring channels and/or reach, and/or luffing angle to provide correspondence of safeguard switch off characteristic to preset load characteristic of crane by adding and/or multiplying results of direct or indirect measurement of at least one of crane operating parameters and signals corresponding to adjustment parameters whose values are stored in non-volatile memory of safeguard. Values of adjustment parameters are determined to provide independent switching off characteristic of safeguard from direction and/or speed of boom movement or speed of movement of crane load gripping members. Different adjustment parameters for different directions and/or speeds of boom and/or load-gripping member can be set.

EFFECT: simplified mounting and servicing of safeguards on crane, improved accuracy of realization of protection functions.

18 cl, 2 dwg

FIELD: mechanical engineering; load-lifting cranes.

SUBSTANCE: invention relates to overload and damage protection of load-lifting cranes. According to proposed method, to prevent emergencies preliminarily determined are tolerable values of parameters characterizing load, and/or spatial position of crane boom and/or load gripping member which are memorized and, in process of operation of crane, one of said parameters is measured and compared with tolerable value, and signals are formed to control crane actuators aimed at preventing excess of tolerable value by measured parameter. Determination of parameters characterizing spatial position of boom, load-gripping member, supports, construction members of other crane or any obstacle in height is based on measuring values of barometric pressure in corresponding points and subsequent calculation of heights. Construction is simplifier, and effective protection of spatial position pickups of crane from mechanical damages if provided. Safety of load-lifting crane in operation is improved owing to accurate and effective measuring of distance between crane and obstacles and prevention of emergencies caused by tilting of fixed platform or portal of crane from horizontal position and in case of approaching thunderstorm.

EFFECT: improved safety of load-lifting crane.

25 cl, 1 dwg

FIELD: materials loading machinery.

SUBSTANCE: invention relates to load-lifting crane protection and control devices and to method of crane control after interlocking of crane motion by protection system. proposed method consists n determining tolerable values of parameters characterizing load and/or spatial position of crane boom-or load-gripping member, and/or distance to transmission line, recording the parameters and measuring in process of operation of load-lifting crane by direct or indirect method of at least of one of said parameters and comparing measured value with tolerable one and subsequent forming of control signals by at least one of operating devices of load-lifting crane designed to preclude excess of tolerable value by said parameter. Additionally, by analyzing values and/or changes of parameters of operation of load-lifting crane, prehistory of operation of load-lifting crane is revealed and recorded which leads to forming of said control signals aimed at precluding excess of tolerable value by said parameter, and order of formation of control signals after prevention of said excess is set depending on indicated prehistory.

EFFECT: improved safety of operation of load-lifting crane and provision of convenience in operation.

16 cl, 1 dwg

FIELD: mechanical engineering; load-lifting equipment.

SUBSTANCE: invention relates to overload and damage protection device of load-lifting cranes and pipelayer cranes. Proposed method comes to adjusting at least one signal in load measuring channels and/or reach, and /or angle of boom tilting by adding and/or multiplying said signal with at least one signal corresponding to at least one adjusting parameter whose value is preliminarily determined and kept in nonvolatile memory of safeguard. Signal is adjusted at no load-gripping member of load-lifting crane at zero value of mass of lifted load or load moment in lifting crane load limiting channel. For this purpose value of at least one of said adjusting parameters is determined at no load on load-gripping member of load-lifting crane.

EFFECT: improved accuracy of safeguard and efficiency of protection of load-lifting crane.

10 cl, 1 dwg

FIELD: mechanical engineering; materials handling facilities.

SUBSTANCE: invention relates to controls of load-lifting mechanisms. Proposed device for measuring tension force of load-lifting mechanism contains base and force take-up mechanism with force sensor connected to mechanism. Force take-up mechanism is made in form of multiple-link mechanism including two inclined rods connected to base, articulated two-link mechanism connecting free ends of inclined rods and central link forming maximum deflection of articulated two-link mechanism. One end of central link is connected to middle joint of two-link mechanism, second end is coupled with base through mechanism shifting end of central link relative to base, and force sensor is built into central link.

EFFECT: simplified servicing of load-lifting mechanisms.

4 cl, 4 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

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: materials handling facilities.

SUBSTANCE: group of inventions relates to devices for checking condition of safeguards of load-lifting machines and reading parameters of built-in parameters recorders. Proposed method comes to revealing output signals of separate components of safeguard and transmitting signals to control device, processing signals and their recording in control device according to prestored signals determining sequence of processing and recording and forming, by control device, in case of necessity, replacement test signals in compliance with prestored signals determining sequence of forming of replacement test signals and transmitting the latter to separate components of safeguard. Revealing of output signals and forming of replacement test signals is done by receiving and transmitting sequential digital signals by multiplexed communication line at asynchronous or synchronous modes by algorithms specified by sequential protocols. Proposed device to control safeguard of load-lifting machine contains control unit, data input-output module and memory module. Data input-output module is made in form of transceivers of multiplexed communication line CAN, LIN, RS-232, USB or IrDA of interface. Group of invention provides both control of safety of safeguard and reading of data of built-in parameters recorder making it possible to reveal troubles of connecting bundles, control and diagnosing of condition of safeguard directly on load-lifting crane, improve safety of crane at partial failures of safeguard owing to automatic or manual program disconnection and subsequent replacement of any defective functional unit of safeguard without its physical disconnection and without complete disconnection of partially failing safeguard.

EFFECT: improved control of safeguard.

12 cl, 1 dwg

FIELD: materials handling facilities; safety engineering.

SUBSTANCE: proposed device contains sensitive element interacting with control elements and installed in lower part of object housing, and warning unit placed in control circuit. Voltage source 1 is electrically connected with input of reversible travel motion starter 2 with normally closed contacts 3 whose output is connected at one side with time delay relay 4 with its power contacts 5 and through normally closed contact of cutoff relay 6, with step-down transformer 7 whose output is connected with series-connected sensitive element 8, signaling relay 9 with normally-open power contacts 10, red warning lamp 11 and howler 12, and at other side, with travel motion control contactor 13 and travel motion motor 14. Time relay 4 is connected through green lamp 15, and load grip switch 16 with series-connected load grip control contactor 17, reversible load grip control starter 18 and load grip motor 19. Sensitive element is made in form of infra-red radiation pickup.

EFFECT: simplified design.

2 cl, 1 dwg

FIELD: mechanical engineering; load-lifting facilities.

SUBSTANCE: invention relates to warning, emergency and control signaling of boom and bridge cranes, lifts and other load-lifting machines. Method is implemented by receiving data of value of at least one operating parameter, or conditions of load-lifting machine or its component, or control action of operator to charge said operating parameter or condition of load-lifting machine or its component. Provision is made for converting data into warning or control signal. In process of conversion of said data they are compared with preliminarily set or memorized limit value of operating parameter or condition of load-lifting machine or its component part, or value of control action of operator. If comparing reveals that data reach limit value or condition, intermediate signal is shaped. Then, depending on value of intermediate signal, warning or control signals are shaped.

EFFECT: improved safety of operation of load-lifting machine, including safety of operator and maintenance personnel.

23 cl, 1 dwg

FIELD: mechanical engineering; load lifting.

SUBSTANCE: invention is designed for use in crane systems to prevent collision of load-lifting cranes with obstacles. Method provides change of spatial position of crane boom or load-gripping member, measuring of at least one coordinate of said positions, memorizing value of coordinate by first command of crane operator and forming working zone of crane with use of memorized value of said coordinate. After first command of crane operator when changing spatial position of boom or load grip-ping member of crane, values of said coordinate are memorized additionally through preset lapses of time or after change of said coordinate through preset value. Process of memorizing is stopped by second command from crane operator. Forming of working zone of crane is effected by calculating borders of zone with use of memorized values of coordinate. At calculations, closure of trajectory of displacement of boom or load-gripping member along at least one said coordinate is revealed. If trajectory closure is presents, working zone of crane is formed within the limits of changes of memorized values of coordinate. At no closure, working zone is formed as sector with center in axis of crane rotation and arc, in common case, curvilinear, whose coordinates do not exceed its maximum memorized values.

EFFECT: possibility of setting working zone of any form by crane operator, including three-dimensional one, taking into account sizes and type of hoisted load and near transmission lines, simplified work of crane operator and design of coordinate protection system.

16 cl, 4 dwg

FIELD: mechanical engineering; materials handling facilities.

SUBSTANCE: invention can be used in safeguards of boom lifting cranes. Proposed method provides for preliminary determination and storing of maximum tolerable value of load moment and determination on current value of moment by two methods in process of crane operation. Each method includes measuring working parameters of crane characterizing current load and current radius with subsequent calculation of current value of load moment. To generate warning signal or crane control signal, memorized maximum tolerable value of load moment is compared either with one of pre-calculated current values of load moment, or with maximum calculated value of two values. Current values of load moment obtained by first and second methods are compared additionally and if they differ crane control signal of formed.

EFFECT: provision of overload protection of load-lifting crane of any type, prevention of crane downtimes caused by frequent failures pf safety system.

16 cl, 1 dwg

Up!