CN201071273Y - Tuning type tower crane torque monitoring device - Google Patents
Tuning type tower crane torque monitoring device Download PDFInfo
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- CN201071273Y CN201071273Y CNU2007200321440U CN200720032144U CN201071273Y CN 201071273 Y CN201071273 Y CN 201071273Y CN U2007200321440 U CNU2007200321440 U CN U2007200321440U CN 200720032144 U CN200720032144 U CN 200720032144U CN 201071273 Y CN201071273 Y CN 201071273Y
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- circuit
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- tower machine
- cambered plate
- displacement pickup
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Abstract
The utility model discloses a tunable tower crane moment monitor device, which comprises a lifting moment sensor (3) and a measurement circuit, wherein the lifting moment sensor (3) includes a cambered plate (5) and a displacement sensor (6), wherein the cambered plate (5) is fixed on a front chord (2) of the tower crane through a support (4) on both ends, the displacement sensor (6) is arranged on the front chord (2) of the tower crane through a support accessory (9), and a measurement probe (7) extending from the displacement sensor (6) is fixed in the middle position on the cambered plate (5) through a connector (8). The utility model can measure and display the real-time lifting moment of the tower crane at high accuracy, and has strong interference resistance.
Description
Technical field
The utility model belongs to lifting transportation technology field, relates to a kind of tuner-type tower machine moment monitor, and this device can be monitored in real time and shows tower machine hoisting moment.
Background technology
Tower crane (being called for short the tower machine) is the material Transport Machinery of widespread use on the building ground, and owing to tower height, brachium, center of gravity height, the easy unstability of misoperation, grave accident happens occasionally, so all forces to install safety guard on all tower machines.Tower crane is according to specified hoisting moment design-calculated, that is to say, regardless of the amplitude variation trolley position, the rated load weight of relevant position and sling system weight sum are got square constant always to the crane arm root, and this constant is exactly specified hoisting moment.The tower machine is in the whole service process, and hoisting moment should not surpass specified hoisting moment, otherwise may cause unstability to be toppled or mechanism's damage.Therefore, necessary mounting torque fender guard moved when the hoisting moment overrate when tower machine dispatched from the factory.Widely used on the present homemade tower machine is bow plate limiter of moment, but mainly there is following problem in it in application process:
1, according to the regulation of GB9462 " tower crane engineering factor " 4.5.2.1 bar: " to the hoisting crane of carriage amplitude varying, load moment limiter should be provided with limit switch and the contact of adjusting by hoisting capacity and amplitude respectively.To the hoisting crane of carriage amplitude varying maximum speed above 0.67m/s, outwards move at dolly, when hoisting moment reaches rated moment 80%, should convert low speed automatically to and outwards move." illustrate that moment overload situation has three kinds in the tower machine working process: 1) under rated load weight, amplitude transfinites, and causes the moment overload; 2) under the regulation amplitude, hoisting capacity transfinites, and causes the moment overload; When 3) band carried high-speed cruising, outwards operation caused the moment overload because of effect of inertia can't in time brake easily.Should be protected respectively at three kinds of overload.But only establish a limit switch on present most of tower machine, can only protect first kind of situation, protection and imperfection by the amplitude debugging.
2, bow plate limiter of moment does not possess the real-time Presentation Function of moment; when reaching capacity the position, just move; the moment situation operating personal that the tower machine bears in the whole service process has no way of finding out about it at all; especially when band carries at a high speed outwards operation; owing to do not have the automatic speed-limiting fender guard on the limiter of moment, though very likely taking place, killer moves, because inertia is big; dolly continues to preshoot, finally causes dangerous the generation.If operating personal can be grasped the moment state at any time and just can early take precautions against, avoid accident to take place, therefore, the moment Presentation Function is necessary.
3, at the deficiency of bow plate limiter of moment, though many effort have been made by many research institutions, and developed the electronic type monitoring product that possesses Presentation Function and applied for multinomial patent, as a collection of achievements in research such as " tower crane operation monitoring devices ".The parameter that this electron-like watch-dog common feature is a monitoring and protecting is numerous, protection is comprehensive, but must be equipped with the sensor of costliness, complicated circuit and intelligentized microprocessor, makes the control monitor unit cost high, is difficult to promote on middle-size and small-size tower machine.And almost whole microprocessors of above-mentioned electronic type watch-dog all adopt micro controller system, and obstacle overcome ability is relatively poor, and is easily affected by environment.There is statistics to show that electronic type control monitor unit trouble free stream time reached 81.4% below 1 year.Illustrate that existing is that the electronic monitor antijamming capability of core is not fully up to expectations really with the micro controller system.
Summary of the invention
The technical problems to be solved in the utility model is: overcome the deficiencies in the prior art, a tuner-type tower machine moment monitoring device is provided, this device can guarantee with enough accuracy detection and show the real-time hoisting moment of tower machine, and possess stronger antijamming capability.
For solving the problems of the technologies described above, the utility model is achieved in that it comprises hoisting moment sensor (3) and metering circuit, described hoisting moment sensor (3) comprises cambered plate (5), displacement pickup (6), the two ends of described cambered plate (5) are fixed on the preceding chord member (2) of tower machine with bearing (4), described displacement pickup (6) is installed on the preceding chord member (2) of tower machine by supporting annex (9), and the measuring head (7) that displacement pickup (6) stretches out is fixed on medium position on the cambered plate (5) by attaching parts (8).
Displacement pickup (6) in the described hoisting moment sensor (3) inserts the input end of free running multivibrator (10) in the metering circuit.
Described metering circuit comprises free running multivibrator (10), FM circuit (11) and frequency-halving circuit (12), described free running multivibrator (10), FM circuit (11) and the input end of frequency-halving circuit (12) with control gate circuit (13) link to each other, the mouth of control gate circuit (13) links to each other with the input end of forward-backward counter (14), the mouth of forward-backward counter circuit (14) links to each other with telltale (17) with driving circuit (16), and forward-backward counter circuit (14) is connected to clear circuit (15).
The beneficial effects of the utility model are:
The utility model catches principal contradiction only to monitor at the hoisting moment of tower machine Safety Effect maximum and show, only detects most critical parameters, has simplified monitoring system, has reduced cost; Utilize the multi-vibrator principle in the metering circuit design, the resistance variations of potentiometer type displacement pickup is converted into the variation of oscillation frequency, measure hoisting moment by detecting frequency, do not need amplifier, do not need the A/D conversion just can realize the numeric display of hoisting moment yet, simplified the circuit link; Build circuit with medium scale integrated circuit modules, the complexity that has promptly reduced circuit has improved antijamming capability again.
Below in conjunction with accompanying drawing the utility model is described in further detail:
Description of drawings
Fig. 1 is tower machine structure and sensor installation site scheme drawing;
Fig. 2 is a hoisting moment sensor construction principle schematic;
Fig. 3 is hoisting moment sensor scheme of installation (an A-A direction);
Fig. 4 is the metering circuit schematic diagram of the function.
The specific embodiment
It comprises the utility model with the lower part:
1. hoisting moment sensor
The hoisting moment sensor is used for measuring in real time the dynamic force moment of tower machine.It is made up of arc steel plate and potentiometer type displacement pickup two parts.
As previously mentioned, the hoisting moment sensor is measured hoisting moment by chord member internal force before measuring and deformation.But preceding chord member deformation is minimum, for being pre-bent to arc elongated sheet steel (being called cambered plate), one of accurate this sensor of measurement employing amplifies this infinitesimal deformation, when preceding chord member compresses, cambered plate generation deflection, miniature deformation with preceding chord member, just be converted into the bigger flexure deformation of bow plate, play the effect of an amplification.The size of cambered plate is according to the specified hoisting moment design of tower machine, and length is at 1.2～1.5m, about thickness of slab 10mm.
Displacement pickup is used for measuring the deflection displacement of cambered plate middle part, because this deflection displacement is directly proportional with the size of hoisting moment, just can obtain hoisting moment as long as measure the deflection displacement of cambered plate.This displacement pickup is selected potentiometer type for use, when the stressed deflection of cambered plate, drives potentiometric moving contact and moves, make the resistance between fixed contact and the moving contact change, changes in resistance and moment variations are proportional, as long as calibrate relation between the two, just can obtain the hoisting moment value.
2. metering circuit
Metering circuit has adopted free running multivibrator.This potentiometer type displacement pickup fixed contact and moving contact are inserted the free running multivibrator input end, and the resistance between fixed, the moving contact is Rx, and then the oscillation period of oscillator is relevant with Rx.In the tower machine working process, hoisting moment constantly changes, the degree of flexibility of cambered plate also changes thereupon, because potentiometric moving contact links to each other with cambered plate, then Rx also changes, cause the corresponding change of oscillation period of oscillator, just can obtain real-time hoisting moment value by the forward-backward counter frequency counting with oscillation frequency.
These metering circuit characteristics are that measurement of resistance is converted into frequency measurement, not only can measure accurately, and test circuit is also very simple, do not need A/D converter just can realize the digitalisation conversion; Whole metering circuit is built with integrated circuit modules, and the circuit link is simple, the reliability height, and obstacle overcome ability is better than micro controller system, and need not programme; Ingenious design-calculated FM circuit only needs to regulate that a parameter---output frequency just can be finished the demarcation of system, and debugging is simple, and it is convenient to demarcate, and after once demarcating, but with regard to place in operation, charactron directly shows actual hoisting moment.
Horizontal arm carriage amplitude varying formula tower machine contour structures and sensor installation site are as shown in Figure 1.Since when the tower machine is sling weight, preceding chord member (2) pressurized on the tower cap (1), and the size of preceding chord member pressure is directly proportional with hoisting moment.Therefore, can draw the dynamic hoisting moment in the tower machine operational process by the size of chord member pressure before measuring and deformation.So will measure the torque sensor (3) of moment is installed on the preceding chord member of tower cap.
The following describes the composition of moment monitor:
1, hoisting moment sensor (3)
Hoisting moment sensor (3) is used for measuring in real time the dynamic force moment of tower machine, and its structure is formed as shown in Figure 2.It is made up of arc steel plate (5) and displacement pickup (6) and fixed bearing annex (9) etc.Wherein, the effect of arc steel plate (5) is to amplify deformation.When the tower machine is sling weight, preceding chord member (2) pressurized on the tower cap (1), the size of preceding chord member pressure is directly proportional with hoisting moment, and in elastic range, pressure and strain (deformation) are proportional.Because preceding chord member compression set is minimum,, accurate one of the employing of measurement amplifies this infinitesimal deformation for being pre-bent to arc elongated sheet steel (abbreviation cambered plate).During use, the two ends of cambered plate are fixed on the preceding chord member (2) with bearing (4), when preceding chord member compresses, and bearing (4) displacement in opposite directions, cambered plate generation deflection with the miniature deformation of preceding chord member (2), just is converted into the bigger flexure deformation of cambered plate (5).
Displacement pickup (6) is used to measure the deflection displacement of cambered plate middle part.Mounting means as shown in Figure 3.Displacement pickup (6) is installed on the preceding chord member (2) with fixed support (9).Displacement pickup adopts potentiometer type, and from measuring head (7) and moving contact interlock that displacement pickup (6) stretches out, the measuring head that stretches out (7) is fixed on the cambered plate (5) by attaching parts (8).When cambered plate (5) flexure deformation, drive measuring head (7) displacement, the output resistance Rx of potentiometer type displacement pickup (6) is changed thereupon.Demarcate the mathematical relation between hoisting moment and the cambered plate deflection displacement before the measurement, can directly obtain the hoisting moment value.
Except above-mentioned method for sensing and principle, the senser element of using in the torque sensor also is the design's a characteristic, displacement pickup (6) adopts state-of-the art military project level conductive plastic film formula potentiometer, and powering on to show the precise displacement value, and it is unlimited that resolution can reach; Hermetically sealed installation, dustproof, antinoise is disturbed, and volume is little, the life-span is long, and low price, cost performance height are fit to middle-size and small-size tower machine and use very much.
2, principle of measurement and metering circuit
Metering circuit is formed as shown in Figure 4.Metering circuit comprises free running multivibrator (10), FM circuit (11), frequency-halving circuit (12), control gate circuit (13), forward-backward counter (14), forward-backward counter clear circuit (15), circuit of display driving (16) and telltale (17).The effect of metering circuit is that the output physical quantity with torque sensor is converted to the hoisting moment value and is shown.
(1) principle of measurement
Potentiometer type displacement pickup (6) is inserted free running multivibrator (10) as a variable resistance Rx.The oscillation period of oscillating circuit comprises the charging duration T1 of capacitor C 1 and T2 discharge time of C1; If choose R1=R2=R, then:
T
1≈0.693(2R+R
x)C
1
T
2≈0.693RC
1
FM circuit (11) be output frequency adjustable oscillator, adjust the output frequency that adjustable potentiometer R just can change FM circuit.It is f that the adjusting knob of rotation R makes its output frequency
0, frequency becomes f behind frequency-halving circuit (12)
0/ 2; Control gate circuit (13) is selected 42 input nand gates for use, and input end connects the mouth of free running multivibrator (10), FM circuit (11) mouth and frequency-halving circuit (12) respectively; What control gate circuit (13) output signal was used for controlling forward-backward counter (14) adds clock pulse counting input end CP
UCarry out plus coujnt, perhaps make to subtract clock pulse count input end CP
DCarry out the subtraction counting.
In time, C1 charges at T1, free running multivibrator (10) output high level, and control gate is opened CP
U, the f that frequency-halving circuit (12) is exported
0/ 2 enter the CP of forward-backward counter (14)
UEnd carries out plus coujnt, and count value is
In time, C1 discharges at T2, free running multivibrator (10) output low level, and control gate is opened CP
D, make FM circuit (11) output signal f
0Enter the CP of forward-backward counter (14)
DEnd carries out the subtraction counting, and count value is
A
2＝T
2×f
0
In one-period T=T1+T2, the count results of forward-backward counter (14) is
Because C1 and f
0Be constant, so forward-backward counter (14) count value is proportional to the size of resistance R x.And Rx and hoisting moment are also proportional, therefore, as long as suitably adjust the output frequency f of FM circuit
0, count value A and tested moment values are consistent.
(2) measurement process
Install the hoisting moment sensor by Fig. 3, with the fixed contact of potentiometer type displacement pickup (6) and the input circuit of the free running multivibrator (10) among moving contact access Fig. 4, the reset key SB that at first pushes after powering in the clear circuit (15) carries out zero clearing to forward-backward counter.Then dead work is already finished.
Calibration method: at arm middle part more arbitrarily, apart from root hinge L place, the known weight of slinging G, then this moment reality hoisting moment be M=G * L; Adjust the variable potentiometer R in the FM circuit (11) among Fig. 4, the numerical value that telltale (17) is shown is M, and the staking-out work of circuit has promptly been finished.
During normal the measurement, in the weight process that hoists, preceding chord member (2) deformation in compression drives cambered plate bearing (4) displacement in opposite directions, makes cambered plate (5) flexure under lateral stress; Cambered plate (5) is subjected to displacement the measuring head (7) of sensor (6) by attaching parts (8), because measuring head connects potentiometric moving contact, so the resistance R x of potentiometer type displacement pickup also changes.And the size of this resistance is directly proportional with hoisting moment.
The measurement of this resistance R x has utilized the principle of work of multi-vibrator.This potentiometer type displacement pickup is inserted the oscillator input circuit, and then oscillation period is relevant with Rx, as described in the principle part of front, just can obtain real-time hoisting moment by frequency counting.
These metering circuit characteristics are that measurement of resistance is converted into frequency measurement, not only can measure accurately, and test circuit is also very simple, do not need A/D converter just can realize the digitalisation conversion; Whole metering circuit is built with integrated circuit modules, and the circuit link is simple, the reliability height, and obstacle overcome ability is far superior to micro controller system, and need not programme; Because measured signal is converted to frequency signal, in transmission course, be difficult for decay, be convenient to teletransmission; The design of ingenious design-calculated FM circuit only needs to regulate that a parameter---the output frequency of FM circuit just can be finished the demarcation of system, and debugging is simple, and it is convenient to demarcate, and after once demarcating, but with regard to place in operation, charactron directly shows actual hoisting moment.
The selected sensor of this hoisting moment monitoring device is cheap, sturdy and durable, and obstacle overcome ability is superior, and data are convenient to teletransmission; The ingenious utilization oscillator of metering circuit principle is used integrated circuit, does not need amplifier, does not need the A/D converter just can be with the test result digitalisation; The design-calculated FM circuit makes adjustment method simple, demarcates easily; This monitoring device principle is ingenious, and circuit is simple, and is cheap, and antijamming capability is strong, is fit to very much all kinds of middle-size and small-size tower machines and uses.
Claims (3)
1. tuner-type tower machine moment monitor, comprise hoisting moment sensor (3) and metering circuit, it is characterized in that: described hoisting moment sensor (3) comprises cambered plate (5), displacement pickup (6), the two ends of described cambered plate (5) are fixed on the preceding chord member (2) of tower machine with bearing (4), described displacement pickup (6) is installed on the preceding chord member (2) of tower machine by supporting annex (9), and the measuring head (7) that displacement pickup (6) stretches out is fixed on medium position on the cambered plate (5) by attaching parts (8).
2. tuner-type tower machine moment monitor according to claim 1 is characterized in that: the displacement pickup (6) in the described hoisting moment sensor (3) inserts the input end of free running multivibrator (10) in the metering circuit.
3. tuner-type tower machine moment monitor according to claim 1, it is characterized in that: described metering circuit comprises free running multivibrator (10), FM circuit (11) and frequency-halving circuit (12), described free running multivibrator (10), FM circuit (11) links to each other with the input end of frequency-halving circuit (12) with control gate circuit (13), the mouth of control gate circuit (13) links to each other with the input end of forward-backward counter (14), the mouth of forward-backward counter circuit (14) links to each other with telltale (17) with driving circuit (16), and forward-backward counter circuit (14) is connected to clear circuit (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200321440U CN201071273Y (en) | 2007-06-27 | 2007-06-27 | Tuning type tower crane torque monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200321440U CN201071273Y (en) | 2007-06-27 | 2007-06-27 | Tuning type tower crane torque monitoring device |
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| Publication Number | Publication Date |
|---|---|
| CN201071273Y true CN201071273Y (en) | 2008-06-11 |
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ID=39549834
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200321440U Expired - Fee Related CN201071273Y (en) | 2007-06-27 | 2007-06-27 | Tuning type tower crane torque monitoring device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101788818A (en) * | 2010-02-11 | 2010-07-28 | 浙江建机科技研发有限公司 | GPRS monitoring system for tower machine |
| CN102336362A (en) * | 2011-09-08 | 2012-02-01 | 中联重科股份有限公司 | Method and device for measuring hoisting moment of tower crane and monitoring system |
| WO2013033904A1 (en) * | 2011-09-08 | 2013-03-14 | 长沙中联重工科技发展股份有限公司 | Method and device for measuring lifting moment of tower crane and monitoring system |
| CN111562097A (en) * | 2020-05-19 | 2020-08-21 | 江苏省特种设备安全监督检验研究院 | Simulation test device and test method for bow-shaped plate torque limiter |
| CN112499498A (en) * | 2019-09-16 | 2021-03-16 | 湖南中联重科建筑起重机械有限责任公司 | Tower crane weight limiting calibration identification method and equipment |
-
2007
- 2007-06-27 CN CNU2007200321440U patent/CN201071273Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101788818A (en) * | 2010-02-11 | 2010-07-28 | 浙江建机科技研发有限公司 | GPRS monitoring system for tower machine |
| CN102336362A (en) * | 2011-09-08 | 2012-02-01 | 中联重科股份有限公司 | Method and device for measuring hoisting moment of tower crane and monitoring system |
| WO2013033904A1 (en) * | 2011-09-08 | 2013-03-14 | 长沙中联重工科技发展股份有限公司 | Method and device for measuring lifting moment of tower crane and monitoring system |
| CN112499498A (en) * | 2019-09-16 | 2021-03-16 | 湖南中联重科建筑起重机械有限责任公司 | Tower crane weight limiting calibration identification method and equipment |
| CN112499498B (en) * | 2019-09-16 | 2024-01-16 | 湖南中联重科建筑起重机械有限责任公司 | Tower crane weight limiting, calibrating and identifying method and equipment |
| CN111562097A (en) * | 2020-05-19 | 2020-08-21 | 江苏省特种设备安全监督检验研究院 | Simulation test device and test method for bow-shaped plate torque limiter |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080611 |