CN103569871B - 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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- CN103569871B CN103569871B CN201210277663.9A CN201210277663A CN103569871B CN 103569871 B CN103569871 B CN 103569871B CN 201210277663 A CN201210277663 A CN 201210277663A CN 103569871 B CN103569871 B CN 103569871B
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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, device and the weight-lifting equipment that adopt pure strain measurement to carry out the restriction of weight-lifting equipment moment.
Background technology
Traditional weight-lifting equipment, by measurement to weight, the arm of force (length of boom and the elevation angle, sport car position etc.), contrasts with the safety weight that stores in treater after load and the arm of force carry out product, then judges whether to transship.Kind of sensor is more, and position is more scattered, is not easy to process of signal transmission.
Along with the heavy-duty of equipment maximizes, wind carries and can not be ignored the impact of equipment.Although speed and the direction of wind can be detected with air velocity transducer, then by with load superpose and experience is assessed wind and is carried impact on equipment.But this mode is difficult to assess exactly wind carries impact on equipment, and be difficult to tremble the dynamic load caused carry out check and evaluation to hanging thing, arm etc.
Load (working load, wind carry, dynamic load etc.) is finally all to be reflected on turntable, tower crane, the present invention obtains complete machine Moment (comprise wind carries, dynamic load etc.) by the strain detecting turntable, tower crane etc., strain measured so synthetically reflects the actual condition of equipment, thus more accurately moment restriction is carried out to apparatus of load, ensure job safety.
Relational language is explained
(1) elevator machinery air velocity transducer
Air velocity transducer is manufactured by the smart steel of high-weatherability, high strength, corrosion prevention and waterproof and high-ductility alloy aluminum, is mainly applicable to the outdoor equipment that crawler crane, wheel crane and shake are jolted, fluctuations is larger.With it can Real-time Collection external environment actual wind speed and export corresponding signal.
(2) limiter of moment
Independently complete in computer-controlled secure operating system, can automatically detect hoisting crane hang the quality and angle residing for crane arm of carrying, and its nominal payload and actual load, swinging radius, angle residing for crane arm can be demonstrated.Real-time monitor and detection hoisting crane operating mode, carries diagnosis function, quick hazard condition warning applications and safety control.Have black box function, the dangerous working condition automatically during record operation, for accident analysis process provides foundation.
Form: telltale, micro controller system calculate control box, angular transducer, linear transducer, pressure (drawing) force snesor.
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 pasted onto in elastic element particular surface, when the physical quantitys such as power, moment of torsion, speed, acceleration/accel and flow act on elastic element, the change of element stress and strain can be caused, and then cause the change of resistance-strain sheet resistance.Change the exporting in the mode of electric signal after processing of circuit of resistance, 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 are for metal filament strain resistor, when metal filament is by External Force Acting, its length and sectional area all can change, can be easy to find out from above formula, namely its resistance value can change, if when metal filament extends by External Force Acting, its length increases, and sectional area reduces, resistance value just can increase.When metal filament compresses by External Force Acting, length reduces and cross section increases, and resistance value then can reduce.As long as measure the change (normally the voltage at measuring resistor two ends) being added in resistance, strain strained situation wiry can be obtained.
Strain-gauge be attached on determinand, its strain along with determinand is stretched 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 applies this principle exactly, is measured strain by the change of measuring resistor.The sensitive grid of general strain-gauge uses chromiumcopper, and its resistance change rate is constant, with strain direct proportionality.That is:
Wherein,
r: the former resistance value Ω of strain-gauge (ohm)
Δ
r: the resistance variations Ω (ohm) caused by extending or compressing
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, AB brachium pontis accesses a strain gage be pasted onto on measuring point, and AD brachium pontis accesses a variable resistance.When measuring point is without strain, adjustment variable resistance R4, makes electric bridge meet equilibrium conditions, then galvanometer
gpointer nulling.
After measuring point produces strain, the resistance of strain-gauge changes, and the equilibrium conditions of electric bridge is destroyed, and electric current will be had 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, usual R1 is working strain gauge, and R2 is dummy gauge.
(3) basic skills of moment limit assay
The basis of crawler crane can be reduced to a rectangle, as shown in Figure 2, then can be reduced to A, B, C, D tetra-points for wheel crane.Generally AB>BC, it is the most dangerous operating mode that the downward projection analyzing known load according to principle of moments is in outside AB, CD.Load trial is carried out according to dangerous working condition, and when the downward projection of such load is in outside AD, BC, system just has more having more than needed, and namely safety factor is larger.That is same load is in different positions, and its safety factor is different.This limits the performance of system capability to a certain extent.If the accurate location of load can be obtained, accurately can control load.
The processing method of several frequently seen weight-lifting equipment
(1) wheel crane
For detecting crane load, traditional method adopts pulling force sensor (pulley type weight sensor), angular transducer (elevation angle, corner), large arm linear transducer etc.
The data that each sensor gathers through process, amplify, shown by telltale, and compare with the rating number that stores in treater.When measurement of comparison exceeds rating number, system gives a warning or automatic train stop.
Its principle is based on the measurement to weight, the arm of force (large arm lengths and the elevation angle), then with through testing the safety weight determined compares, and is difficult to the factors such as assessment wind carries, dynamic load to the impact of moment.
(2) crawler crane
The moment of crawler crane monitors with wheel crane comparatively similar, but its brachium is not use sensor to detect and need shift to an earlier date and manually input.
Its principle is based on the measurement to weight, the arm of force (elevation angle), then compares with safety weight, is difficult to consider that the factors such as wind carries, dynamic load are on the impact of moment.
(3) tower crane
The moment of tower crane monitors needs the amount detected to comprise: weight of material, sport car position etc.Patent ZL99206351.5 and patent ZL200420030955.3 sets forth protector and the lifting monitoring device of tower crane.
Its principle is based on the measurement to weight, the arm of force (sport car position), then compares with safety weight, is difficult to the factors such as assessment wind carries, dynamic load to the impact of moment.
The deficiency that prior art exists is:
(1) impact considering the factors such as wind carries, dynamic load is difficult to
Due to the increase of lifting tonnage, the oad of large lifting equipment is comparatively large, and wind-force be can not ignore the impact that it produces.Prior art adopts air velocity transducer, can detect speed and the direction of wind like this, then by with load superpose and experience is assessed wind and is carried impact on equipment.This mode is difficult to assess exactly wind and carries impact on equipment, and relies on the experience of operator to a great extent.
By the impact that length of boom, lifting rope length and wind carry etc., hang thing, arm etc. and tremble the dynamic load caused and can not be ignored equally.Traditional moment inspecting mode is difficult to assess trembleing the dynamic load caused.
(2) sensor is arranged scattered, is not easy to transmission and the process of data
Traditional moment inspecting 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 process of data.Especially rice up to a hundred may be had long for large-scale its brachium of crawler crane, such data transmission is comparatively difficult.Wheel crane and its brachium of tower crane flexible (sport car moves) are also for the transmission of data brings difficulty.
If adopt wired mode to transmit data, longer its of transmission line is decayed and disturbs more serious, and time brachium flexible (sport car moves), transmission line is easily wound around.
If employing transmission over radio, then sensor needs the function such as collection, process, wireless transmission of integrated data, adds cost.
(3) the quantity kind of required sensor is more
Number of sensors needed for prior art and kind 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 the weight-lifting equipment that carry out the restriction of weight-lifting equipment moment.
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 and make orthogonal x-axis and y-axis with weight-lifting equipment turntable or basic cross-section centroid, 4 points of x-axis and y-axis and cross sectional boundary intersection point, and wherein the strain of x-axis positive dirction is
ε 1, y-axis positive dirction strain for for
ε 2, x-axis negative direction strain be
ε 3, y-axis negative direction strain be
ε 4;
(2) eccentric throw on x-axis direction and y-axis direction is calculated respectively according to formula (1) and (2)
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-axis direction of its centre of form axle,
i y for cross section is to its centre of form axle moment of inertia in the y-axis direction,
afor the cross-sectional area in turntable or basic cross section,
yfor stress point is to the distance of neutral axis.
Described turntable refers to the turntable of weight-lifting equipment, and moment is also born in the position of device bottom load-bearing that what what described basis referred to rise, and is the concrete pedestal as tower crane; For irregular or or be not easy to detect weight-lifting equipment, basis can also refer to making circle or square transition apparatus is arranged on below turntable or the midway location of column, make this transition apparatus become a part for tower crane turntable or column, and bears moment.
The cross section on described weight-lifting equipment turntable or basis can rule also can be fitfull.
Further, described turntable or basic cross section are circular, and diameter is d, calculates eccentric throw Δ x, Δ y on x-axis direction and y-axis direction respectively according to formula (3) and (4);
（3）
（4）。
Further, described turntable or basic cross section are annular, overall diameter D, and interior diameter is d, then calculate eccentric throw Δ x, Δ y on x-axis direction and y-axis direction respectively according to formula (5) and (6);
（5）
（6）。
Further, described turntable or basic cross section are rectangle, and long is a, and in y-direction, wide is b, in the x direction, then calculates eccentric throw Δ x, Δ y on x-axis direction and y-axis direction respectively according to formula (7) and (8);
（7）
（8）。
Further, it also comprises the size utilizing formula (9) assumed (specified) load, and then judges the step of safety of weight-lifting equipment;
（9）
Described
f 0for load,
efor the modulus of elasticity on turntable or basis.
Further, it also comprises and utilizes eccentric throw Δ x, Δ y to obtain load relative car body in the position of downward projection plane, thus carries out moment restriction to apparatus of load more accurately.
According to a further aspect in the invention, a kind of measuring system for the restriction of weight-lifting equipment moment is provided, comprises:
Strain-gauge, be arranged on weight-lifting equipment turntable or upper 4 of basis, described 4 refer to and make orthogonal x-axis and y-axis with weight-lifting equipment turntable or basic cross-section centroid, 4 points of x-axis and y-axis and cross sectional boundary intersection point, for obtaining this strain of 4;
Transmission system;
Disposal system, processes the data that transmission system transmits, obtains a result.
Preferably, the strain-gauge of every bit is multiple.Be multiple in the strain-gauge of same position, average and can reduce measured error.
The turntable of weight-lifting equipment is generally barrel-shaped, and its cross-sectional plane is annular.Such sensor can be mounted on the outside face of turntable, also can be mounted on the inside face of turntable.
Be mounted on outside face, be convenient to safeguard, but sensor itself need be protected, and avoids directly exposed.
Be mounted on inside face, compare the protection being beneficial to sensor, but be not easy to safeguard.
During monitor strain, the strain-gauge in this patent can adopt and variously connect bridge method on strain bridge, and half-bridge monolithic connects bridge method, series connection strain-gauge connects bridge method, full-bridge connection.In addition, as strain measurement method, there are comparatively proven technique and product can supply to adopt at present.Such as, 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, by the measurement to weight, the arm of force (length of boom and the elevation angle, sport car position etc.), obtains moment to judge whether after load and the arm of force carry out product and transships.Along with the heavy-duty of equipment maximizes, wind carries and can not be ignored the impact of equipment.Although speed and the direction of wind can be detected with air velocity transducer, be difficult to assess exactly wind and carry impact on equipment.In addition, be difficult to tremble the dynamic load caused carry out check and evaluation to hanging thing, arm etc.
The present invention obtains complete machine Moment (comprise wind carries, dynamic load etc.) by the strain detecting turntable, tower crane etc., strain measured so synthetically reflects the actual condition of equipment, thus more accurately moment restriction is carried out to apparatus of load, ensure job safety.
Current various rotary weight-lifting equipment all adopts the mode measuring load weight and the arm of force to obtain turntable moment, or measures hydraulic pressure acquisition excavation load.This technology yet there are no application in rotary weight-lifting equipment load context of detection at present, is adapted at the rotary weight-lifting equipments such as wheel crane, crawler crane, tower crane, crane for ship, harbour rotating lifting are applied.
The invention has the beneficial effects as follows:
(1) impact considering the factors such as wind carries, dynamic load is convenient to
It is finally will be reflected on turntable (tower crane) that wind carries, and the strain of the present invention just on measuring circurmarotate (tower crane), strain measured so just reflects the impact that wind carries.
In fact, load (working load, wind carry, dynamic load etc.) is finally all to be reflected on turntable, tower crane, the present invention obtains complete machine Moment (comprise wind carries, dynamic load etc.) by the strain detecting turntable, tower crane etc., strain measured so synthetically reflects the actual condition of equipment, thus more accurately moment restriction is carried out to apparatus of load, ensure job safety.
(2) sensor arranges Relatively centralized, is convenient to transmission and the process 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 comparatively near that sensor is positioned at turntable distance operator's compartment, is convenient to transmission and the process of data.For the detection of tower crane, its sensor is positioned at ground and is convenient to installation and maintenance.
Avoid the problem such as decay, interference, winding that the transmission of longer distance wired exists, avoid the high cost that transmission over radio is brought simultaneously.
(3) only a kind of sensor (referring to strain-gauge) is needed
The present invention only need detect the strain of turntable (tower crane), so minimum need four detect the sensor strained.Which reduce kind and the quantity of sensor, thus reduce 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, i.e. the eccentric throw of Part VI derivation herein
Δ x,
Δ y.Be conducive to the accurate control to load like this, and save the angular transducer measuring degreeof turn.
Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to 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 limit assay;
Fig. 3 a is the force diagram of car hosit load to turntable;
Fig. 3 b is that car hosit load is done to be used as equivalent load and moment of flexure schematic diagram to turntable;
Fig. 4 a is the force diagram of tower crane load to basis;
Fig. 4 b is that tower crane load makes equivalent load and moment of flexure schematic diagram to basic role.
Detailed description of the invention
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
This technology is adapted at the rotary weight-lifting equipments such as wheel crane, crawler crane, tower crane, crane for ship, harbour rotating lifting are applied.
Below discuss for car hosit and tower crane.
(1) car hosit
The load of car hosit
fbe applied to suspension hook place.
Load act as a power 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, first carries out reasoning with cylinder herein, then directly provide barrel-shaped conclusion for ease of reasoning.
The turntable of hoisting crane is reduced to a cylinder pressurized quarter butt, 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 that pressure produces,
ε mx for moment of flexure
m x the strain produced,
ε my for moment of flexure
m y the strain produced.
Arrangement above formula obtains:
Namely
Continue to arrange:
Namely
In like manner:
Namely
So just can by the strain of strain-gauge
ε 1,
ε 2,
ε 3,
ε 4obtain pressure
fwith two moments of flexure
m x ,
m y strain corresponding respectively
ε f ,
ε mx ,
ε my .
By Hook's law
Pressure can be obtained
fwith two moments of flexure
m x ,
m y stress corresponding respectively
σ f ,
σ mx ,
σ my .
Wherein, modulus of elasticity
efor the inherent characteristic of material.
For pressure
f 0by
:
Wherein, A is the cross-sectional area of 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 stress point is to the distance of neutral axis,
i x for pressurized quarter butt cross section is to the moment of inertia of 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, then
Cross-sectional area
Stress point is to the distance of neutral axis
Pressurized quarter butt cross section is to the moment of inertia of 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 the load of hoisting crane, be conducive to the judgement to force moment of crane and accurately control like this, and save the angular transducer measuring degreeof turn.
The present invention obtains complete machine Moment (comprise wind carries, dynamic load etc.) by the strain detecting turntable, tower crane etc., strain measured so synthetically reflects the actual condition of equipment, thus more accurately moment restriction is carried out to apparatus of load, 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 tower crane that basis is comparatively regular, the strain on its basis can be detected.
(3) irregular for basis, or be not easy to the tower crane detected, a circle can be made or square transition apparatus is arranged on below turntable or a certain midway location of column, make this transition apparatus become a part for tower crane turntable or column, and bear moment.Strain on this transition apparatus of such detection can obtain tower crane Moment.
Below discuss for tower crane.
Its basic cross section of some rotary weight-lifting equipment is rectangle, and the column of such as 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
，
Pressurized quarter butt cross section is to the moment of inertia of 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 the load on basis, be conducive to the judgement to force moment of crane and accurately control.
The present invention obtains complete machine Moment (comprise wind carries, dynamic load etc.) by the strain detecting turntable, tower crane etc., strain measured so synthetically reflects the actual condition of equipment, thus more accurately moment restriction is carried out to apparatus of load, ensure job safety.
Although illustrate and describe embodiments of the invention, those having ordinary skill in the art will appreciate that: can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present invention and aim, scope of the present invention is by claim and equivalents 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 and make orthogonal x-axis and y-axis with weight-lifting equipment turntable or basic cross-section centroid, 4 points of x-axis and y-axis and cross sectional boundary intersection point, and wherein the strain of x-axis positive dirction is
ε 1, y-axis positive dirction strain for for
ε 2, x-axis negative direction strain be
ε 3, y-axis negative direction strain be
ε 4;
(2) eccentric throw on x-axis direction and y-axis direction is calculated respectively according to formula (1) and (2)
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-axis direction of its centre of form axle,
i y for cross section is to its centre of form axle moment of inertia in the y-axis direction,
afor the cross-sectional area in turntable or basic cross section,
yfor stress point is to the distance of neutral axis.
2. method according to claim 1, is characterized in that, described turntable or basic cross section are circular, and diameter is d, calculates eccentric throw Δ x, Δ y on x-axis direction and y-axis direction respectively according to formula (3) and (4);
（3）
（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, then calculate eccentric throw Δ x, Δ y on x-axis direction and y-axis direction respectively according to formula (5) and (6);
（5）
（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 the x direction, then calculates eccentric throw Δ x, Δ y on x-axis direction and y-axis direction respectively according to formula (7) and (8);
（7）
（8）。
5. method according to claim 1, is characterized in that, it also comprises the size utilizing formula (9) assumed (specified) load, and then judges the step of safety of weight-lifting equipment;
（9）
Described
f 0for load,
efor the modulus of elasticity on turntable or basis.
6. the method according to any one of claim 1-5, is characterized in that, it also comprises and utilizes eccentric throw Δ x, Δ y to obtain load relative car body in the position of downward projection plane, thus carries out moment restriction to apparatus of load more accurately.
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 upper 4 of basis, described 4 refer to and make orthogonal x-axis and y-axis with weight-lifting equipment turntable or basic cross-section centroid, 4 points of x-axis and y-axis and cross sectional boundary intersection point, for obtaining this strain of 4;
Transmission system;
Disposal system, processes the data that transmission system transmits, and treating process adopts the method described in any one of claim 1-6, obtains a result.
8. the measuring system for the restriction of weight-lifting equipment moment according to claim 7, it is characterized in that, the strain-gauge of every bit is multiple.
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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| CN201210277663.9A CN103569871B (en) | 2012-08-06 | 2012-08-06 | Method and device for limiting torque of hoisting equipment and hoisting equipment |
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| CA2990968C (en) * | 2015-06-30 | 2023-10-03 | Harnischfeger Technologies, Inc. | Systems and methods for controlling machine ground pressure and tipping |
| DE102015010491A1 (en) * | 2015-08-17 | 2017-02-23 | Senvion Gmbh | Method for operating a wind turbine, wind turbine and computer program product |
| CN105920830A (en) * | 2016-05-12 | 2016-09-07 | 金华杰夫体育用品有限公司 | Electric skateboard safety protection method based on weight sensing |
| CN109186829A (en) * | 2018-08-27 | 2019-01-11 | 四川大学 | A kind of device for air heat engine experiment precise measurement torque |
| CN113816267B (en) * | 2021-09-30 | 2023-08-15 | 三一汽车起重机械有限公司 | Lateral displacement measuring method and device for crane boom and crane |
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| DE2639762A1 (en) * | 1976-09-03 | 1978-03-09 | Demag Ag | LOAD MEASURING DEVICE FOR LIFTING EQUIPMENT WITH THE MEASUREMENT STRIP |
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| CN102261890A (en) * | 2011-04-19 | 2011-11-30 | 长沙中联重工科技发展股份有限公司 | Rotation angle measuring equipment |
| CN102519636A (en) * | 2011-12-01 | 2012-06-27 | 北京市三一重机有限公司 | Device and method for measuring force of crawler-type mechanism |
| CN102564789A (en) * | 2011-12-29 | 2012-07-11 | 中联重科股份有限公司 | Excavator comprehensive performance testing system |
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2012
- 2012-08-06 CN CN201210277663.9A patent/CN103569871B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2639762A1 (en) * | 1976-09-03 | 1978-03-09 | Demag Ag | LOAD MEASURING DEVICE FOR LIFTING EQUIPMENT WITH THE MEASUREMENT STRIP |
| CN201272445Y (en) * | 2008-05-27 | 2009-07-15 | 谢炎民 | Non-contact power torque measured electric bicycle wheel disc |
| CN102261890A (en) * | 2011-04-19 | 2011-11-30 | 长沙中联重工科技发展股份有限公司 | Rotation angle measuring equipment |
| CN102519636A (en) * | 2011-12-01 | 2012-06-27 | 北京市三一重机有限公司 | Device and method for measuring force of crawler-type mechanism |
| CN102564789A (en) * | 2011-12-29 | 2012-07-11 | 中联重科股份有限公司 | Excavator comprehensive performance testing system |
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| CN103569871A (en) | 2014-02-12 |
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