CN104045011A - Crane moment limiter - Google Patents
Crane moment limiter Download PDFInfo
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- CN104045011A CN104045011A CN201410298348.3A CN201410298348A CN104045011A CN 104045011 A CN104045011 A CN 104045011A CN 201410298348 A CN201410298348 A CN 201410298348A CN 104045011 A CN104045011 A CN 104045011A
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- crane
- module
- torque limiter
- pressure sensor
- singlechip
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Abstract
The invention relates to a crane moment limiter which comprises a singlechip and a state information storage mould which is connected with the singlechip; the input end of the singlechip is connected with a data collection channel module and a keyboard parameter input module; the output end of the singlechip is connected with a dot-matrix LCD module and an alarm braking protection module; the data collection channel module comprises a length sensor, an angle sensor, a pressure sensor and an A/D conversion module which is connected with the output ends of the length sensor, the angle sensor and the pressure sensor; the length sensor is arranged at a capstan of a main arm of a crane; the angle sensor is arranged on the main arm above a hook; and the pressure sensor is arranged on a steel wire by using a special clamp. The crane moment limiter is an intelligent device which can adopt the sensors and the singlechip to measure a plurality of working parameters of the crane in an on-line manner, and has the functions of parameter setting, real-time state display, over-limiting alarming and the like. By using the crane moment limiter, the degree of automation, the control precision and the operation safety of the crane can be improved.
Description
Technical field
The present invention relates to hoisting crane technical field, specifically relate to a kind of crane torque limiter.
Background technology
Hoisting crane plays very important effect in engineering construction and accident rescue, in the time using hoisting crane to carry out hoisting operation, hoisting crane moment is in the course of the work constantly to change, and the moment that it can bear is a definite value, work range is larger, the weight that hoisting crane can be sling is just lighter, if exceeding restriction, hoisting moment can cause the arm complete machine serious accident such as topple that fractures even, therefore, one of the safe precaution measure that is absolutely necessary of sensitive failure-free limiter of moment is installed on hoisting crane.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of crane torque limiter, it is the intelligent equipment that utilizes sensor and micro controller system to carry out on-line measurement to the multiple working parameters of hoisting crane, has the functions such as parameter setting, real-time condition display, overload alarm braking.Utilize it can improve degree of automation, control accuracy and the processing safety of hoisting crane.
For solving the problems of the technologies described above, the invention provides following technical scheme: a kind of crane torque limiter, comprise AT89C52 micro controller system and the state-information-storage module being connected with AT89C52 micro controller system, the input end of described AT89C52 micro controller system is connected with keyboard parameter load module with data acquisition channel module, and the mouth of described AT89C52 micro controller system is connected with alarm, brake protection module with dot matrix lcd module; Described acquisition channel module is by linear transducer, angular transducer, pressure sensor and be connected to the A/D modular converter of three's mouth; Described linear transducer is arranged on main arm of crane capstan place, and described angular transducer is arranged on the principal arm of suspension hook top, and described pressure sensor uses unit clamp to be arranged on steel rope.
Preferably, between the mouth of described linear transducer, angular transducer, pressure sensor and A/D modular converter, be also designed with V/I change-over circuit.
Preferably, described A/D modular converter is 12 A/D converter MAX197.
Preferably, described V/I change-over circuit is made up of a TL074 chip and a small amount of peripheral components.
Preferably, described TL074 chip is an integrated package that includes 4 op amps (IC1A～IC1D).
Preferably, described dot matrix lcd module adopts dot matrix graphic Liquid Crystal Module MGL (S)-240128E.
Preferably, described state-information-storage module adopts CMOS Electrically Erasable Read Only Memory.
The beneficial effect that the present invention compared with prior art has is: (1) limiter of moment of the present invention is as the safety guard of hoisting crane; there is the advantages such as volume is little, function is many, reliability is high, easy to operate, meet the requirement of national relevant technologies standard and operating accuracy.It exactly the hoisting capacity to hoisting crane and work range monitor, the safe operation of hoisting crane is played a very good protection.(2) limiter of moment of the present invention adopts multi-parameter demonstration and overload warning to make operating personal can understand in time the working condition of hoisting crane, has improved work efficiency, effective trouble-saving generation.
Brief description of the drawings
Fig. 1 system hardware composition frame chart of the present invention;
Fig. 2 limiter of moment fundamental diagram of the present invention;
Fig. 3 limiter of moment V/I of the present invention change-over circuit figure.
Number in the figure is: 1-AT89C52 micro controller system, 2-acquisition channel module, 21-linear transducer, 22-angular transducer; 23-pressure sensor, 24-A/D modular converter, 3-alarm, brake protection module; 4-keyboard parameter load module, 5-dot matrix lcd module, 6-state-information-storage module.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Known referring to figs. 1 through Fig. 3, a kind of crane torque limiter, comprise AT89C52 micro controller system 1 and the state-information-storage module 6 being connected with AT89C52 micro controller system 1, the input end of described AT89C52 micro controller system 1 is connected with keyboard parameter load module 4 with data acquisition channel module 2, and the mouth of described AT89C52 micro controller system 1 is connected with alarm, brake protection module 3 with dot matrix lcd module 5; Described acquisition channel module 2 is by linear transducer 21, angular transducer 22, pressure sensor 23 and be connected to the A/D modular converter 24 of three's mouth; Described linear transducer 21 is arranged on main arm of crane capstan place, and described angular transducer 22 is arranged on the principal arm of suspension hook top, and described pressure sensor 23 uses unit clamp to be arranged on steel rope.
MCU in system adopts AT89C52 micro controller system, and its employing CHMOS technique and high density, non-volatile memory technology are manufactured, and completely compatible with 80C51 pin and instruction repertoire, its inner contained functional component is: 18 bit CPU; 1 sheet internal oscillator and clock circuit; 8KB PEROM; 3 16 bit timings/counting machines; 21 special function registers; 48 bit parallel I/O mouths, totally 32 programmable I/O end lines; 1 full duplex serial port able to programme; 8 interrupt sources.
In data acquisition channel, use linear transducer, angular transducer and pressure sensor.They gather respectively the signal of principal arm extended length, the principal arm elevation angle and lifted load, after amplification, utilize V/I change-over circuit to convert weak voltage signals to 4～20mA current signal, this current signal is delivered to after master controller, select special chip RCV420 to realize the accurate transformation of 4～20mA current signal and 0～5V voltage signal, finally voltage signal is sent into A/D converter conversion.The installation of pressure sensor will meet easy for installation, measures accurately, and the linearity is good.System is used unit clamp, and sensor is directly installed on steel rope, reflects lifted load by detecting steel wire rope tension.Facts have proved, this mode simple installation, accuracy of detection is high.
Main arm of crane and horizontal angle are called the principal arm elevation angle.This angle has reflected the work range of hoisting crane and the hazard level of toppling, and is directly connected to whether safety of work, therefore also needs accurate measurement.System adopts this angle of weight hammer type structure measurement.
Data acquisition A/D conv is selected multirange, multi-channel analog input channel, 12 A/D converter MAX197.This A/D converter has that conversion rate is fast, precision is high and micro controller system reads the features such as convenient.The signals such as principal arm extended length, the principal arm elevation angle and hoisting capacity are sent into CH0, CH1, the CH2 passage of MAX197, can select certain passage by programming, convert analog quantity to corresponding digital quantity, then are read in and carried out data processing by micro controller system.
Pressure sensor and angular transducer output-1～1V weak voltage signals can be because line drop and various interference etc. affect survey precision.Current signal has better anti-interference resistance compared with voltage signal, is applicable to long-distance transmissions.Utilize 1 TL074 and a small amount of peripheral components to form V/I change-over circuit, as shown in Figure 3.TL074 is 1 integrated package that includes 4 op amps (IC1A～IC1D).The control amplifier being formed by IC1A, its in-phase input end is sent into the voltage V1 that will change, its inverting input is introduced 2 voltages: the 1st voltage is the output voltage V B of the voltage follower that is made up of IC1B, VB=V2, and effect is that 1 tuningout voltage is provided in circuit transmission function; The 2nd is the output voltage V C of the homophase tandem differential amplifier circuit that is made up of IC1C and IC1D, and its value equals 2 times that current viewing resistor RCS both end voltage is fallen.The bleeder being made up of 2 resistance R 1 will be added the inverting input of delivering to IC1A again after VB, VC voltage decile.For ensureing that V/I conversion work is at linear zone, control amplifier IC1A must send enough large electric current and flow through RCS, so add 1 electric current amplifying stage being made up of transistor BC639 after IC1A.
If flowing through the switching current of RCS is IL, VIO=ILRL
The operational amplification circuit being made up of IC1D is known:
VD＝(1+R2/R2)VIO＝2IL·RL
And V12=IL (RCS+RL)
The operational amplification circuit being formed from IC1C
VC＝(1+R2/R2)V12-(R2/R2)VD＝2IL(RCS+RL)-2ILRL＝2IL?RCS
VE＝VB/2+VC/2＝(V2+2ILRCS)/2
To IC1A, because there is VE=V1
So V1=(V2+2ILRCS)/2
Therefore the transition function of whole circuit is
IL＝(V1-0.5V2)/RCS
V2=-3V in Fig. 3, RCS=125 Ω, in the time that input voltage is 0～20mV, the electric current of IL is that 4～20mA. test results shows, the linearity of this circuit is better than after this V/I change-over circuit of 0.02%. has been debugged sealing being installed together with pressure sensor, angular transducer, and power supply and current signal, by a pair of twisted-pair feeder transmission, have improved antijamming capability, and saved transmission line, solve preferably the problem of small signal in the transmission of harsh environment medium and long distance.
Further, described dot matrix lcd module 5 adopts dot matrix graphic Liquid Crystal Module MGL (S)-240128E.Its dot matrix quantity is 240 × 128, and lattice dimensions is 0127mm, and liquid crystal display, under the control of outside display control switch, can show character and the Chinese character of 8 × 8,8 × 16,16 × 16 dot matrix such as grade, simultaneously can also display graphics.Can graphic form show in real time the working parameters such as principal arm length, the principal arm elevation angle, maximum lifting height, work range, actual hoisting capacity, rated load weight, moment mass percent or according to the dynamic analog graphoid that detects data and draw in real time hoisting crane.
Further, described state-information-storage module 6 adopts CMOS Electrically Erasable Read Only Memory.Capacity is 1K (64 × 16), adopts the manufacture of CMOS technique, single+5V power supply, and 8 pin DIP encapsulation, not only have hardware and software writing protection function, and completely compatible with TTL circuit.There are a series of uniquenesses such as cost is low, interface simple, reliable operation due to 93C46, can be connected with the microprocessor of various models very easily, in the present embodiment, can be to hoisting crane in the course of the work, the operating mode of the hoisting cranes such as its actual hoisting capacity of real time recording, rated load weight, principal arm extended length, the principal arm elevation angle, as the original foundation of accident analysis.
In data acquisition channel, 2 use linear transducer 21, angular transducer 22 and pressure sensor 23.They gather respectively the signal of principal arm extended length, the principal arm elevation angle and lifted load, after amplification, utilize V/I change-over circuit to convert weak voltage signals to 4～20mA current signal, this current signal is delivered to after master controller, select special chip RCV420 to realize the accurate transformation of 4～20mA current signal and 0～5V voltage signal, finally voltage signal is sent into A/D converter 24 and changed.A/D converter 24 is sent to the signal after conversion after AT89C52 micro controller system 1, AT89C52 micro controller system 1 calculates work range according to main arm of crane extended length and principal arm elevation meter, obtain the biggest lifting capacity that under work at present amplitude, hoisting crane can bear by tabling look-up, be rated load weight, the pressure sensor 23 being arranged on steel rope can obtain current actual hoisting capacity.The ratio of actual hoisting capacity and rated load weight is called moment mass percent, i.e. moment mass percent=(actual hoisting capacity/rated load weight) × 100%, and limiter of moment judges whether safety of work at present state according to moment mass percent.If there is fault, alarm, brake protection module 3 carries out sound and light alarm.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. a crane torque limiter, it is characterized in that: comprise AT89C52 micro controller system and the state-information-storage module being connected with AT89C52 micro controller system, the input end of described AT89C52 micro controller system is connected with keyboard parameter load module with data acquisition channel module, and the mouth of described AT89C52 micro controller system is connected with alarm, brake protection module with dot matrix lcd module; Described acquisition channel module is by linear transducer, angular transducer, pressure sensor and be connected to the A/D modular converter of three's mouth; Described linear transducer is arranged on main arm of crane capstan place, and described angular transducer is arranged on the principal arm of suspension hook top, and described pressure sensor uses unit clamp to be arranged on steel rope.
2. a kind of crane torque limiter according to claim 1, is characterized in that: between the mouth of described linear transducer, angular transducer, pressure sensor and A/D modular converter, be also designed with V/I change-over circuit.
3. a kind of crane torque limiter according to claim 1, is characterized in that: described A/D modular converter is 12 A/D converter MAX197.
4. a kind of crane torque limiter according to claim 2, is characterized in that: described V/I change-over circuit is made up of a TL074 chip and a small amount of peripheral components.
5. a kind of crane torque limiter according to claim 4, is characterized in that: described TL074 chip is an integrated package that includes 4 op amps (IC1A～IC1D).
6. a kind of crane torque limiter according to claim 1, is characterized in that: described dot matrix lcd module adopts dot matrix graphic Liquid Crystal Module MGL (S)-240128E.
7. a kind of crane torque limiter according to claim 1, is characterized in that: described state-information-storage module adopts CMOS Electrically Erasable Read Only Memory.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410298348.3A CN104045011A (en) | 2014-06-20 | 2014-06-20 | Crane moment limiter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410298348.3A CN104045011A (en) | 2014-06-20 | 2014-06-20 | Crane moment limiter |
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| CN104045011A true CN104045011A (en) | 2014-09-17 |
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| CN201410298348.3A Pending CN104045011A (en) | 2014-06-20 | 2014-06-20 | Crane moment limiter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105253781A (en) * | 2015-10-31 | 2016-01-20 | 长治清华机械厂 | Moment limiter suitable for complex electromagnetic compatibility environment |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004043087A (en) * | 2002-07-10 | 2004-02-12 | Sumitomo Heavy Industries Construction Crane Co Ltd | Safety device for crawler crane |
| CN201458610U (en) * | 2009-08-06 | 2010-05-12 | 宜昌市创星电子技术发展有限公司 | Moment limiter for small-sized engineering crane |
| CN201458611U (en) * | 2009-08-06 | 2010-05-12 | 宜昌市创星电子技术发展有限公司 | Dual-redundancy load moment limiter for crane |
| JP4675861B2 (en) * | 2006-08-11 | 2011-04-27 | シャープ株式会社 | Printing apparatus, computer program for controlling printing apparatus, and method for controlling printing apparatus |
| CN201890732U (en) * | 2010-11-21 | 2011-07-06 | 杭州华润传感器厂 | Jib type lifting torque limiter |
| CN201914873U (en) * | 2010-12-15 | 2011-08-03 | 东北石油大学 | Tower crane monitoring device based on GPRS and U-disk memory |
| CN202575792U (en) * | 2012-04-17 | 2012-12-05 | 中国人民解放军总后勤部建筑工程研究所 | Folding arm type lorry-mounted crane torque limit device |
| CN203116755U (en) * | 2013-03-26 | 2013-08-07 | 哈尔滨职业技术学院 | Integrative sensor and transducer combination |
-
2014
- 2014-06-20 CN CN201410298348.3A patent/CN104045011A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004043087A (en) * | 2002-07-10 | 2004-02-12 | Sumitomo Heavy Industries Construction Crane Co Ltd | Safety device for crawler crane |
| JP4675861B2 (en) * | 2006-08-11 | 2011-04-27 | シャープ株式会社 | Printing apparatus, computer program for controlling printing apparatus, and method for controlling printing apparatus |
| CN201458610U (en) * | 2009-08-06 | 2010-05-12 | 宜昌市创星电子技术发展有限公司 | Moment limiter for small-sized engineering crane |
| CN201458611U (en) * | 2009-08-06 | 2010-05-12 | 宜昌市创星电子技术发展有限公司 | Dual-redundancy load moment limiter for crane |
| CN201890732U (en) * | 2010-11-21 | 2011-07-06 | 杭州华润传感器厂 | Jib type lifting torque limiter |
| CN201914873U (en) * | 2010-12-15 | 2011-08-03 | 东北石油大学 | Tower crane monitoring device based on GPRS and U-disk memory |
| CN202575792U (en) * | 2012-04-17 | 2012-12-05 | 中国人民解放军总后勤部建筑工程研究所 | Folding arm type lorry-mounted crane torque limit device |
| CN203116755U (en) * | 2013-03-26 | 2013-08-07 | 哈尔滨职业技术学院 | Integrative sensor and transducer combination |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105253781A (en) * | 2015-10-31 | 2016-01-20 | 长治清华机械厂 | Moment limiter suitable for complex electromagnetic compatibility environment |
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Application publication date: 20140917 |