CN103569871A - Method and device for limiting torque of hoisting equipment and hoisting equipment - Google Patents
Method and device for limiting torque of hoisting equipment and hoisting equipment Download PDFInfo
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- CN103569871A CN103569871A CN201210277663.9A CN201210277663A CN103569871A CN 103569871 A CN103569871 A CN 103569871A CN 201210277663 A CN201210277663 A CN 201210277663A CN 103569871 A CN103569871 A CN 103569871A
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Abstract
The invention discloses a kind of methods for being measured using pure strain and carrying out the limitation of lifting equipment torque, include: (1) obtain lifting equipment turntable or on the basis of 4 points of strain (2) eccentricity Δ x, Δ y in x-axis direction and y-axis direction are calculated separately according to formula (1) and (2), the accurate control according to Δ x, Δ y realization to load;
(1), (2). Also provide a kind of measuring system for the limitation of lifting equipment torque, comprising: foil gauge; Transmission system; Processing system. And provide a kind of lifting equipment containing measuring system. The medicine have the advantages that the influence of (1) convenient for factors such as consideration wind load, dynamic loads; (2) sensor arrangement Relatively centralized, convenient for the transmission and processing of data; (3) a kind of sensor is only needed; (4) readily available load relative position.
Description
Technical field
The present invention relates to a kind of method that adopts pure strain measurement to carry out weight-lifting equipment moment restriction, device and weight-lifting equipment.
Background technology
Traditional weight-lifting equipment is by the measurement to weight, the arm of force (length of boom and the elevation angle, sport car position etc.), load and the arm of force carry out after product with treater in the safety weight stored contrast, then judge whether to transship.Sensor kind is more, and position is more scattered, is not easy to process of signal transmission.
Along with the heavy-duty maximization of equipment, wind carries the impact of equipment be can not be ignored.Although can detect speed and the direction of wind with air velocity transducer, then assess wind by the stack with load and experience and carry the impact on equipment.But this mode is difficult to assess exactly wind carries the impact on equipment, and be difficult to detect assessment to hanging the dynamic load that the vibrations such as thing, arm cause.
Load (working load, wind carry, dynamic load etc.) is all finally will be reflected on turntable, tower crane, the present invention obtains complete machine Moment (comprise wind carries, dynamic load etc.) by detecting the strain of turntable, tower crane etc., measured like this strain has synthetically reflected the actual condition of equipment, thereby more accurately apparatus of load is carried out to moment restriction, ensure job safety.
Relational language is explained
(1) elevator machinery air velocity transducer
Air velocity transducer is manufactured by smart steel and the high-ductility alloy aluminum of high-weatherability, high strength, corrosion prevention and waterproof, is mainly applicable to the outdoor equipment that crawler crane, wheel crane and shake are jolted, fluctuations is larger.Actual wind speed that can Real-time Collection external environment with it is also exported corresponding signal.
(2) limiter of moment
Independently completely by computer-controlled secure operating system, can automatically detect hoisting crane and hang quality and the residing angle of crane arm of carrying, and can demonstrate its nominal payload and actual load, swinging radius, the residing angle of crane arm.Monitor and detection hoisting crane operating mode, carries diagnosis function in real time, fast hazard condition warning applications and safety control.Have black box function, the dangerous working condition while automatically recording operation, processes foundation is provided for accident analysis.
Form: telltale, micro controller system calculate control box, angular transducer, linear transducer, pressure (drawing) power sensor.
Field of application: the mechanical equipments such as car hosit, wheel-mounted crane, railroad track hoisting crane, crawler crane, tower crane, span winch and aerial platform.
(3) strain-gauge principle of work
Resistance strain gage is sticked in elastic element particular surface, when the physical quantitys such as power, moment of torsion, speed, acceleration/accel and flow act on elastic element, can cause the variation of element stress and strain, and then cause the variation of resistance-strain sheet resistance.The mode with electric signal of the variation of resistance after processing of circuit exported, the principle of work of Here it is resistance strain type sensor.
The resistance value of metallic conductor can be represented by the formula:
R=
ρ*
L/
S
Wherein:
ρ---electrical resistivity (the Ω * cm of metallic conductor
2/ m)
s---the sectional area (cm of conductor
2)
l---the length (m) of conductor
We take metal filament strain resistor as example, when metal filament is subject to External Force Acting, its length and sectional area all can change, from above formula, can be easy to find out, its resistance value can change, and while extending if metal filament is subject to External Force Acting, its length increases, and sectional area reduces, resistance value just can increase.When metal filament is subject to External Force Acting and while compressing, length reduces and cross section increases, and resistance value can reduce.As long as measure the variation (the normally voltage at measuring resistor two ends) that is added in resistance, can obtain strain strained situation wiry.
Strain-gauge is attached on determinand, makes its strain along with determinand flexible together, the metal foil of the inside is just along with strain elongates or shortens like this.A lot of metal its resistance when mechanically elongating or shortening can change thereupon.Strain-gauge is applied this principle exactly, by the variation of measuring resistor, strain is measured.What the sensitive grid of general strain-gauge used is chromiumcopper, and its resistance change rate is constant, with strain relation in direct ratio.That is:
Wherein,
r: the former resistance value Ω of strain-gauge (ohm)
Δ
r: extend or compress caused resistance variations Ω (ohm)
k: constant of proportionality (strain-gauge constant)
ε: strain
Different metallic materials has different constant of proportionality
k.Chromiumcopper
kvalue is about 2.Like this, the measurement of strain is just converted to the measurement to resistance variations by strain-gauge.
(4) basic skills of bridge measurement strain
In circuit shown in Fig. 1, a strain gage sticking on measuring point of AB brachium pontis access, AD brachium pontis accesses a variable resistance.At measuring point, during without strain, adjust variable resistance R4, make electric bridge meet equilibrium conditions, galvanometer
gpointer nulling.
When measuring point produces after strain, the resistance of strain-gauge changes, and the equilibrium conditions of electric bridge is destroyed, will have electric current to pass through galvanometer
g, galvanometer needle deflection.
In normal temperature strain measurement, often utilize electrical bridge principle, adopt temperature compensation act to eliminate the impact of temperature traverse, R1 is working strain gauge conventionally, R2 is dummy gauge.
(3) basic skills of moment restriction test
The basis of crawler crane can be reduced to a rectangle, as shown in Figure 2, for wheel crane, can be reduced to A, B, C, tetra-points of D.AB>BC generally, the downward projection of analyzing known load according to principle of moments is the most dangerous operating mode in AB, CD outside.Load trial is carried out according to dangerous working condition, and when the downward projection of load is outside AD, BC like this, system just has more having more than needed, and safety factor is larger.That is to say that same load is in different positions, its safety factor is different.This has limited the performance of system capability to a certain extent.If can obtain the accurate location of load, can accurately control load.
The processing method of several frequently seen weight-lifting equipment
(1) wheel crane
For detecting crane load, traditional method is to adopt pulling force sensor (pulley type weight sensor), angular transducer (elevation angle, corner), large arm lengths sensor.
The data that each sensor gathers, through processing, amplifying, show by telltale, and with treater in the rating number stored compare.When measurement of comparison exceeds rating number, system gives a warning or automatic train stop.
Its principle is the measurement based on to weight, the arm of force (large arm lengths and the elevation angle), then with through testing definite safety weight compares, and is difficult to assess the impacts of factor on moment such as wind carries, dynamic load.
(2) crawler crane
The moment of crawler crane monitors with wheel crane comparatively similar, but its brachium is not to use sensor to detect and manually input in advance.
Its principle is the measurement based on to weight, the arm of force (elevation angle), then compares with safety weight, is difficult to consider the impacts of factor on moment such as wind carries, dynamic load.
(3) tower crane
The moment of tower crane monitors needs the amount detecting to comprise: weight of material, sport car position etc.Patent ZL99206351.5 and patent ZL200420030955.3 have provided respectively protector and the lifting monitoring device of tower crane.
Its principle is the measurement based on to weight, the arm of force (sport car position), then compares with safety weight, is difficult to assess the impacts of factor on moment such as wind carries, dynamic load.
The deficiency that prior art exists is:
(1) be difficult to consider the impact of the factors such as wind carries, dynamic load
Due to the increase of lifting tonnage, the oad of large lifting equipment is larger, and wind-force be can not ignore the impact of its generation.Prior art is to adopt air velocity transducer, can detect like this speed and the direction of wind, then by the stack with load and experience, assesses wind and carries the impact on equipment.This mode is difficult to assess exactly wind and carries the impact on equipment, and relies on to a great extent operator's experience.
The impact that is subject to that length of boom, lifting rope length and wind carry etc., hangs the dynamic load that the vibrations such as thing, arm cause and can not be ignored equally.The dynamic load that traditional moment detection mode is difficult to vibration to cause is assessed.
(2) sensor layout is scattered, is not easy to transmission and the processing of data
Traditional moment detection mode sensor is arranged scattered, and for wheel crane, crawler crane and tower crane, its weight sensor is distant apart from operator's compartment, is not easy to transmission and the processing of data.Especially for large-scale its brachium of crawler crane, may have rice up to a hundred long, data transmission is comparatively difficult like this.Its brachium of wheel crane and tower crane flexible (sport car moves) is also for the transmission of data has brought difficulty.
If adopt wired mode to transmit data, longer its decay of transmission line and disturb more seriously, and during brachium flexible (sport car moves), transmission line is easily wound around.
If employing transmission over radio, sensor needs the function such as collection, processing, wireless transmission of integrated data, has increased cost.
(3) the quantity kind of required sensor is more
Number of sensors and kind that prior art is required are more, comprising: measure the pulling force sensor of load weight, measure the angular transducer at the arm elevation angle, measure the brachium sensor of length of boom.Although the price of moment sensor is lower, more sensor is not only the problem of cost, and its maintenance is also not easy to carry out.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of method, device and weight-lifting equipment that carries out weight-lifting equipment moment restriction.
For achieving the above object, the present invention adopts following technical proposals:
Adopt pure strain measurement to carry out a method for weight-lifting equipment moment restriction, comprising:
(1) obtain weight-lifting equipment turntable or the basis strain of upper 4, described 4 refer to weight-lifting equipment turntable or the basic cross section centre of form and make orthogonal x axle and y axle, 4 points of x axle and y axle and cross sectional boundary intersection point, and wherein the strain of x axle positive dirction is
ε 1, y axle positive dirction strain for being
ε 2, x axle negative direction strain be
ε 3, y axle negative direction strain be
ε 4;
(2) according to formula (1) and (2), calculate respectively eccentric throw on x direction of principal axis and y direction of principal axis
Δ x,
Δ y, according to Δ x,
it is right that Δ y realizesthe accurate control of load;
（1）
（2）
Wherein,
i x for cross section is to the moment of inertia on the x direction of principal axis of its centre of form axle,
i y for cross section is to the moment of inertia of its centre of form axle on y direction of principal axis,
afor the cross-sectional area in turntable or basic cross section,
yfor the distance of stress point to neutral axis.
Described turntable refers to the turntable of weight-lifting equipment, described basis refers to rise device bottom load-bearing position and bear moment, be the concrete pedestal as tower crane; For irregular or or be not easy to the weight-lifting equipment that detects, basis can also refer to make midway location that a circle or square transition apparatus be arranged on turntable below or column, makes this transition apparatus become a part for tower crane turntable or column, and bears moment.
Described weight-lifting equipment turntable or basis cross section can rule can be also fitfull.
Further, described turntable or basic cross section are circular, and diameter is d, according to formula (3) and (4), calculates respectively eccentric throw Δ x, Δ y on x direction of principal axis and y direction of principal axis;
Further, described turntable or basic cross section are annular, overall diameter D, and interior diameter is d, according to formula (5) and (6), calculates respectively eccentric throw Δ x, Δ y on x direction of principal axis and y direction of principal axis;
Further, described turntable or basic cross section are rectangle, and long is a, and in y direction, wide is b, in x direction, according to formula (7) and (8), calculates respectively eccentric throw Δ x, Δ y on x direction of principal axis and y direction of principal axis;
Further, it also comprises the size of utilizing formula (9) assumed (specified) load, and then the step of the safety of judgement weight-lifting equipment;
Described
f 0for load,
emodulus of elasticity for turntable or basis.
Further, it also comprises and utilizes eccentric throw Δ x, Δ y to obtain the relative car body of load in the position of downward projection plane, thereby more accurately apparatus of load is carried out to moment restriction.
According to a further aspect in the invention, provide a kind of measuring system for weight-lifting equipment moment restriction, comprising:
Strain-gauge, be arranged on weight-lifting equipment turntable or basis upper 4 upper, described 4 refer to weight-lifting equipment turntable or the basic cross section centre of form and make orthogonal x axle and y axle, 4 points of x axle and y axle and cross sectional boundary intersection point, for obtaining this strain of 4;
Transmission system;
Disposal system, the data that transmission system is transmitted are processed, and obtain a result.
Preferably, the strain-gauge of every bit is a plurality of.Strain-gauge at same position is a plurality of, averages and can reduce measured error.
The turntable of weight-lifting equipment is generally barrel-shaped, and its cross-sectional plane is annular.Sensor can be mounted on the outside face of turntable like this, also can be mounted on the inside face of turntable.
Be mounted on outside face, be convenient to safeguard, but sensor itself need protect, avoid directly exposed.
Be mounted on inside face, be relatively beneficial to the protection of sensor, but be not easy to safeguard.
During monitor strain, the strain-gauge in this patent can adopt the various bridge methods that connect on strain bridge, half-bridge monolithic connect bridge method, series connection strain-gauge connect bridge method, full-bridge connection all can.In addition, as for strain measurement method, there are at present the comparatively proven technique and product can be for adopting.For example on electronic scale, widely used sensor is exactly the method based on strain measurement.
According to another aspect of the invention, provide a kind of weight-lifting equipment, above-mentioned arbitrary measuring system.
Described weight-lifting equipment is wheel crane, crawler crane, tower crane, crane for ship, harbour rotating lifting.
The key point of the present invention's design is:
Traditional weight-lifting equipment is by the measurement to weight, the arm of force (length of boom and the elevation angle, sport car position etc.), and load and the arm of force carry out obtaining moment after product and judge whether to transship.Along with the heavy-duty maximization of equipment, wind carries the impact of equipment be can not be ignored.Although can detect speed and the direction of wind with air velocity transducer, be difficult to assess exactly wind and carry the impact on equipment.In addition, be difficult to detect assessment to hanging the dynamic load that the vibrations such as thing, arm cause.
The present invention obtains complete machine Moment (comprise wind carries, dynamic load etc.) by detecting the strain of turntable, tower crane etc., measured like this strain has synthetically reflected the actual condition of equipment, thereby more accurately apparatus of load is carried out to moment restriction, ensure job safety.
Various rotary weight-lifting equipments all adopt the mode of measuring load weight and the arm of force to obtain turntable moment at present, or measure hydraulic pressure acquisition and excavate load.Present technique yet there are no application in rotary weight-lifting equipment load context of detection at present, is adapted at wheel crane, crawler crane, tower crane, crane for ship, harbour with applying on the rotary weight-lifting equipments such as rotating lifting.
The invention has the beneficial effects as follows:
(1) be convenient to consider the impact of the factors such as wind carries, dynamic load
It is finally will be reflected to turntable (tower crane) above that wind carries, and the present invention measures the strain on turntable (tower crane) just, and measured like this strain has just reflected the impact that wind carries.
In fact, load (working load, wind carry, dynamic load etc.) is all finally will be reflected on turntable, tower crane, the present invention obtains complete machine Moment (comprise wind carries, dynamic load etc.) by detecting the strain of turntable, tower crane etc., measured like this strain has synthetically reflected the actual condition of equipment, thereby more accurately apparatus of load is carried out to moment restriction, ensure job safety.
(2) sensor layout is relatively concentrated, is convenient to transmission and the processing of data
Sensor is comparatively concentrated in layout, and for the detection of the equipment turntable Moments such as wheel crane, crawler crane, tower crane, excavating machine, it is nearer apart from operator's compartment that sensor is positioned at turntable, is convenient to transmission and the processing of data.For the detection of tower crane, its sensor is positioned at ground and is convenient to installation and maintenance.
Avoided longer distance wired transmission problem, the problem includes: problems such as decay, interference, windings, that has avoided that transmission over radio brings is expensive simultaneously.
(3) only need a kind of sensor (referring to strain-gauge)
The present invention only need detect the strain of turntable (tower crane), so four sensors that detect strain of minimum need.Reduced like this kind and the quantity of sensor, thereby reduced cost, and be convenient to safeguard.
(4) be convenient to obtain load relative position
The present invention can obtain the relative car body of load easily in the position of downward projection plane, the eccentric throw that the 6th part is derived herein
Δ x,
Δ y.Be conducive to so the accurate control to load, and saved the angular transducer of measuring degreeof turn.
Additional aspect of the present invention and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage accompanying drawing below combination obviously and is easily understood becoming the description of embodiment, wherein:
Fig. 1 is the basic skills circuit diagram of bridge measurement strain;
Fig. 2 is the basic skills schematic diagram of moment restriction test;
Fig. 3 a is the force diagram of car hosit load to turntable;
Fig. 3 b is that car hosit load is done as equivalent load and moment of flexure schematic diagram turntable;
Fig. 4 a is that tower crane load is to basic force diagram;
Fig. 4 b is that tower crane load is made equivalent load and moment of flexure schematic diagram to basic role.
The specific embodiment
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Below by the embodiment being described with reference to the drawings, be exemplary, only for explaining the present invention, and can not be interpreted as limitation of the present invention.
This technology is adapted at wheel crane, crawler crane, tower crane, crane for ship, harbour with applying on the rotary weight-lifting equipments such as rotating lifting.
Below discuss that to take car hosit and tower crane be example.
(1) car hosit
The load of car hosit
fbe applied to suspension hook place.
The act as power of load to turntable
f, as shown in bottom left figure, this power can be equivalent to a power
f 0with two moments of flexure
m x ,
m y .The turntable of hoisting crane can be reduced to a barrel-shaped pressurized quarter butt, for ease of reasoning, first with cylinder, carries out reasoning herein, then directly provides barrel-shaped conclusion.
The turntable of hoisting crane is reduced to a cylinder pressurized quarter butt, and its diameter is
d, be highly
h, as shown in Figure 3 a, 3 b.
The strain that problem can be reduced to known four strain- gaugies 1,2,3,4 is respectively
ε 1,
ε 2,
ε 3,
ε 4ask load
fand eccentric throw
Δ x,
Δ y.
The strain of four strain-gaugies is:
Wherein:
ε 1,
ε 2,
ε 3,
ε 4be respectively the strain of strain- gauge 1,2,3,4,
ε f for the strain of pressure generation,
ε mx for moment of flexure
m x the strain producing,
ε my for moment of flexure
m y the strain producing.
Arrangement above formula obtains:
Continue to arrange:
In like manner:
So just can be by the strain of strain-gauge
ε 1,
ε 2,
ε 3,
ε 4obtain pressure
fwith two moments of flexure
m x ,
m y corresponding strain respectively
ε f ,
ε mx ,
ε my .
By Hook's law
Can obtain pressure
fwith two moments of flexure
m x ,
m y the stress that difference is corresponding
σ f ,
σ mx ,
σ my .
Wherein, modulus of elasticity
einherent characteristic for material.
For pressure
f 0by
:
Wherein, the cross-sectional area that A is turntable,
.
For moment of flexure
m x ,
m y by bending normal stresses computing formula
Wherein:
σfor bending normal stresses,
mfor moment of flexure,
yfor the distance of stress point to neutral axis,
i x for the moment of inertia of pressurized quarter butt cross section to its centre of form axle.
Obtain moment of flexure
m x ,
m y
So, eccentric throw
Δ x,
Δ y
In fact, truck crane turntable mostly is ring section, external diameter
dinternal diameter
d,
Cross-sectional area
Stress point is to the distance of neutral axis
The moment of inertia of pressurized quarter butt cross section to its centre of form axle
Load
Moment of flexure
m x ,
m y
Eccentric throw
Δ x,
Δ y
according to Δ x,
Δ yobtain the relative car body of load in the position of downward projection plane, according to
f 0obtain the load of load to hoisting crane, be conducive to like this judgement of force moment of crane and accurately controlled, and save the angular transducer of measuring degreeof turn.
The present invention obtains complete machine Moment (comprise wind carries, dynamic load etc.) by detecting the strain of turntable, tower crane etc., measured like this strain has synthetically reflected the actual condition of equipment, thereby more accurately apparatus of load is carried out to moment restriction, ensure job safety.
(2) tower crane
For tower crane, there are three kinds of detection modes available.
(1) strain of direct-detection tower crane turntable.
(2) for the comparatively regular tower crane in basis, can detect its basic strain.
(3) irregular for basis, or be not easy to the tower crane detecting, can make a certain midway location that a circle or square transition apparatus are arranged on turntable below or column, make this transition apparatus become a part for tower crane turntable or column, and bear moment.The strain detecting on this transition apparatus like this can obtain tower crane Moment.
Below discuss and take tower crane as example.
Its basic cross section of some rotary weight-lifting equipment is rectangle, and for example the column of tower crane is truss mechanism, but its concrete pedestal can be reduced to rectangle pressurized quarter butt, and its length is respectively
a,
b,
h, as shown in Fig. 4 a, 4b.
Cross-sectional area
Stress point is to the distance of neutral axis
The moment of inertia of pressurized quarter butt cross section to its centre of form axle
，
Load
Moment of flexure
m x ,
m y
Eccentric throw
Δ x,
Δ y
according to Δ x,
Δ yobtain the relative car body of load in the position of downward projection plane, according to
f 0obtain load to basic load, be conducive to the judgement of force moment of crane and accurately control.
The present invention obtains complete machine Moment (comprise wind carries, dynamic load etc.) by detecting the strain of turntable, tower crane etc., measured like this strain has synthetically reflected the actual condition of equipment, thereby more accurately apparatus of load is carried out to moment restriction, ensure job safety.
Although illustrated and described embodiments of the invention, those having ordinary skill in the art will appreciate that: in the situation that not departing from principle of the present invention and aim, can carry out multiple variation, modification, replacement and modification to these embodiment, scope of the present invention is limited by claim and equivalent thereof.
Claims (10)
1. adopt pure strain measurement to carry out a method for weight-lifting equipment moment restriction, it is characterized in that, comprising:
(1) obtain weight-lifting equipment turntable or the basis strain of upper 4, described 4 refer to weight-lifting equipment turntable or the basic cross section centre of form and make orthogonal x axle and y axle, 4 points of x axle and y axle and cross sectional boundary intersection point, and wherein the strain of x axle positive dirction is
ε 1, y axle positive dirction strain for being
ε 2, x axle negative direction strain be
ε 3, y axle negative direction strain be
ε 4;
(2) according to formula (1) and (2), calculate respectively eccentric throw on x direction of principal axis and y direction of principal axis
Δ x,
Δ y, according to Δ x,
it is right that Δ y realizesthe accurate control of load;
Wherein,
i x for cross section is to the moment of inertia on the x direction of principal axis of its centre of form axle,
i y for cross section is to the moment of inertia of its centre of form axle on y direction of principal axis,
afor the cross-sectional area in turntable or basic cross section,
yfor the distance of stress point to neutral axis.
2. method according to claim 1, is characterized in that, described turntable or basic cross section are circular, and diameter is d, according to formula (3) and (4), calculates respectively eccentric throw Δ x, Δ y on x direction of principal axis and y direction of principal axis;
（4）。
3. method according to claim 1, is characterized in that, described turntable or basic cross section are annular, overall diameter D, and interior diameter is d, according to formula (5) and (6), calculates respectively eccentric throw Δ x, Δ y on x direction of principal axis and y direction of principal axis;
（6）。
4. method according to claim 1, is characterized in that, described turntable or basic cross section are rectangle, and long is a, and in y direction, wide is b, in x direction, according to formula (7) and (8), calculates respectively eccentric throw Δ x, Δ y on x direction of principal axis and y direction of principal axis;
5. method according to claim 1, is characterized in that, it also comprises the size of utilizing formula (9) assumed (specified) load, and then the step of the safety of judgement weight-lifting equipment;
Described
f 0for load,
emodulus of elasticity for turntable or basis.
6. according to the method described in claim 1-5 any one, it is characterized in that, it also comprises and utilizes eccentric throw Δ x, Δ y to obtain the relative car body of load in the position of downward projection plane, thereby more accurately apparatus of load is carried out to moment restriction.
7. for a measuring system for weight-lifting equipment moment restriction, it is characterized in that, comprising:
Strain-gauge, be arranged on weight-lifting equipment turntable or basis upper 4 upper, described 4 refer to weight-lifting equipment turntable or the basic cross section centre of form and make orthogonal x axle and y axle, 4 points of x axle and y axle and cross sectional boundary intersection point, for obtaining this strain of 4;
Transmission system;
Disposal system, the data that transmission system is transmitted are processed, and obtain a result.
8. the measuring system for weight-lifting equipment moment restriction according to claim 7, is characterized in that, the strain-gauge of every bit is a plurality of.
9. a weight-lifting equipment, is characterized in that, comprises the measuring system described in claim 7 or 8.
10. weight-lifting equipment according to claim 9, is characterized in that, described weight-lifting equipment is wheel crane, crawler crane, tower crane, crane for ship, harbour rotating lifting.
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| WO2017004389A1 (en) * | 2015-06-30 | 2017-01-05 | Harnischfeger Technologies, Inc. | Systems and methods for controlling machine ground pressure and tipping |
| CN108138745A (en) * | 2015-08-17 | 2018-06-08 | 森维安有限公司 | For running the method for wind power equipment, wind power equipment and computer program product |
| CN109186829A (en) * | 2018-08-27 | 2019-01-11 | 四川大学 | A kind of device for air heat engine experiment precise measurement torque |
| CN113816267A (en) * | 2021-09-30 | 2021-12-21 | 三一汽车起重机械有限公司 | Method and device for measuring lateral displacement of crane boom and crane |
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| CN107923138B (en) * | 2015-06-30 | 2021-05-28 | 久益环球地表采矿公司 | System and method for controlling mechanical ground pressure and overturning |
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| CN108138745A (en) * | 2015-08-17 | 2018-06-08 | 森维安有限公司 | For running the method for wind power equipment, wind power equipment and computer program product |
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| CN113816267A (en) * | 2021-09-30 | 2021-12-21 | 三一汽车起重机械有限公司 | Method and device for measuring lateral displacement of crane boom and crane |
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