CN2720787Y - Laser receiver for levelling ground system controlled by laser - Google Patents
Laser receiver for levelling ground system controlled by laser Download PDFInfo
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- CN2720787Y CN2720787Y CN 200420066308 CN200420066308U CN2720787Y CN 2720787 Y CN2720787 Y CN 2720787Y CN 200420066308 CN200420066308 CN 200420066308 CN 200420066308 U CN200420066308 U CN 200420066308U CN 2720787 Y CN2720787 Y CN 2720787Y
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Abstract
The utility model relates to a laser receiver for a levelling ground system controlled by laser, which comprises a photoelectric sensor, a signal conditioning circuit board and a casing; the signal conditioning circuit board is provided with a signal amplitude modulation circuit, a signal amplifying circuit, a signal shaping circuit, a pulse widening processing circuit, a power circuit and an output terminal for connecting a controller; the photoelectric sensor comprises silicon photocells installed at both sides of the signal conditioning circuit board and a filter installed at the photosensitive surface of the silicon photocells. The utility model adopts the home-made photoelectric sensor and the filter, and the performance is stable; the laser receiver for a levelling ground system controlled by laser is matched with the corresponding controller and laser transmitter to form a laser control system, and the levelling ground operation of the dry farmland or the paddy field can be done.
Description
Technical field
The utility model relates to a kind of laser pickoff, especially a kind of laser pickoff that is used for laser leveling system.
Background technology
China is large agricultural country, and agricultural water accounts for 75.3% of national water consumption, and surface irrigation is the main method of China's agricultural irrigation, improves the farmland flat condition, can improve the availability of farmland irrigation water.
The land readjustment method comprises conventional level land method and laser controlled leveling method.The equipment that conventional level land method adopts has bulldozer, scraper and Slicking apparatus, have big, the relatively low characteristics of level land expense of cubic metre of earth migration quantity, be suitable for the relatively poor thick flat operation in farmland of bigger, the original smooth degree of surface relief, can change the macrorelief in farmland.Because leveling effect mainly depends on the construction precision of bulldozer and Slicking apparatus, is subjected to equipment self defective and manually-operated the influence, after reaching certain smooth precision, be difficult to further improve.The laser controlled leveling technology is to utilize the laser beam reference plane as non-vision control device, replaces conventional level land equipment operator's range estimation to judge, controls the lifting that hydraulic control system realizes the level land shovel automatically, reaches meticulous purpose of leveling land.Its application can increase substantially the land readjustment precision, and hands-operation personnel's pacifically accurate 10～50 times of hand-hydraulic regulating system is judged in the sensitivity of its receiving system at least than the artificial vision.The laser controlled leveling operating efficiency is higher, suits to finish the farmland surface essence on the thick flat basis of routine and puts down, and further improves the smooth precision in farmland.
The laser pickoff that is used for laser leveling system of present domestic use, because a little less than the anti-interference, the radius of clean-up is little, precision is low, many reasons such as unit inefficiency all are not applied and are converted into productivity and demand urgently being improved.
The utility model content
Technical problem to be solved in the utility model is at the deficiencies in the prior art, and a kind of laser pickoff that is used for laser leveling system is provided, and its antijamming capability is strong, stable performance, and the precision height, working range is wide, and cost is lower.
Technical problem to be solved in the utility model is achieved by the following technical solution:
A kind of laser pickoff that is used for laser leveling system, it comprises photoelectric sensor, signal conditioning circuit plate and shell, between described signal conditioning circuit plate and the shell rubber blanket is installed, and can alleviate the influence that vehicle-mounted shake causes certainty of measurement.Described signal conditioning circuit plate is provided with signal amplitude modulation circuit, signal amplification circuit, signal transformation circuit, pulse stretching treatment circuit, power circuit and is used to connect the lead-out terminal of controller; Described photoelectric sensor comprises silicon photocell that is installed on signal conditioning circuit plate both sides and the light filter that is installed on the silicon photocell photosensitive surface.Described light filter is the red glass of surface coating, has improved the sensitivity of photoelectric sensor, has reduced the interference of natural daylight, has improved the signal to noise ratio of photoelectric sensor incident light.
45 ° of angle directions are provided with metallic support along the outside upward in the both sides of described signal conditioning circuit plate, the position 90 ° of bendings to the inside therebetween of described metallic support; Described silicon photocell has 32, be divided into 8 groups, every group of 4 silicon photocell are located at respectively on each plane of both sides metallic support of signal conditioning circuit plate, therefore can evenly distribute in 360 ° of scopes, satisfy the effective receiving angle of laser signal and be 360 ° requirement.
The utility model adopts homemade photoelectric sensor and light filter, stable performance, can with corresponding controller and the supporting composition laser control system of generating laser, carry out dry land or paddy field grading operation.
Description of drawings
Fig. 1 is a structural representation of the present utility model;
Fig. 2 is that silicon photocell of the present utility model is arranged one of schematic diagram;
Fig. 3 is two of a silicon photocell layout schematic diagram of the present utility model;
Fig. 4 is an operation principle block diagram of the present utility model;
Fig. 5 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments the technical solution of the utility model is further specified:
As shown in Figure 1, be structural representation of the present utility model, it comprises photoelectric sensor 1, signal conditioning circuit plate 2 and shell 3, between signal conditioning circuit plate 2 and the shell 3 rubber blanket 31 is installed, and can alleviate the influence that vehicle-mounted shake causes certainty of measurement.Signal conditioning circuit plate 2 is provided with signal amplitude modulation circuit 21, signal amplification circuit 22, signal transformation circuit 23, pulse stretching treatment circuit 24, power circuit 25 and is used to connect the lead-out terminal 26 of controller; Photoelectric sensor 1 comprises the silicon photocell 11 of the both sides that are installed on signal conditioning circuit plate 2 and is installed on the light filter 12 of the photosensitive surface of silicon photocell 11.Because the external interference signal is more much better than than laser beam L signal, the signal to noise ratio (snr) of incident light is very low; Photoelectric sensor 1 is saturated easily under the bigger situation of incident intensity simultaneously, and the sensitivity meeting reduces significantly; Therefore processing must filter.In the processing that filters, the light filter 12 of the method making of plated film is carried out in employing on the red glass surface, can remove interference, improve the signal to noise ratio and the sensitivity thereof of photoelectric sensor 1 incident light, make photoelectric sensor 1 receive only signal from laser beam L from other light such as sunshines.
As shown in Figure 2, arrange one of schematic diagram for silicon photocell of the present utility model, 45 ° of angle directions are provided with metallic support 27 along the outside upward in the both sides of signal conditioning circuit plate 2, metallic support 27 position 90 ° of bendings to the inside therebetween; The specification of silicon photocell 11 is 20mm * 5mm, silicon photocell 11 has 32, be divided into 8 groups, every group of 4 silicon photocell 11 are located at respectively on each plane of both sides metallic support 27 of signal conditioning circuit plate 2, therefore can in 360 ° of scopes, evenly distribute, satisfy the effective receiving angle of laser signal and be 360 ° requirement.Simultaneously farthest reduce photronic quantity, reduced production cost significantly.
As shown in Figure 3, arrange two of schematic diagram for silicon photocell of the present utility model, silicon photocell 11 is labeled as A respectively, B ..., H, wherein A, the parallel connection of B layer, the expression laser signal is in " too high " position; C, the parallel connection of D layer, the expression laser signal is in " height " position; E, the parallel connection of F layer, the expression laser signal is in " low " position; On behalf of laser signal, G, the parallel connection of H layer be in " too low " position.8 floor silicon photocell 11 have 4 tunnel outputs.
As Fig. 4 and shown in Figure 5, be operation principle block diagram of the present utility model and circuit theory diagrams, the utility model has adopted the small-signal modulate circuit, is made up of signal amplitude modulation circuit 21, signal amplification circuit 22, signal transformation circuit 23, pulse stretching treatment circuit 24.During work, the level land shovel is positioned over the ground tile height is about all high place, receiver is fixed on the correct position that the upper support pole is shoveled on the level land, make laser beam L impinge upon the centre position of receiver, lead-out terminal 26 is connected to controller K by holding wire; Along with moving of tractor, the position that laser beam L impinges upon on the receiver will change, and the variation of landing ground height is represented in this variation, and receiver will pass to controller to this variable signal, so that controller is made a response.In the small-signal modulate circuit on signal conditioning circuit plate 2, control signal has been passed through following processing:
1, modulation: amplitude modulation circuit 21 is made up of inductance L 1, inductance L 2, inductance L 3 and the inductance L 4 of 2.2mH.After photoelectric sensor received through the L of the laser beam clearly signal of handling that filters, laser signal was an analog electrical signal through opto-electronic conversion, because multiple The noise, the signal to noise ratio of this analog signal is very low, and is a small-signal that low frequency is gradual.Therefore, before exchanging amplification, need modulate this signal.The utility model has adopted the way of amplitude modulation(PAM).
2, amplify: the signal after the modulation is very faint, and through signal amplification circuit 22, the modulation signal that high frequency is faint is amplified to the volt magnitude.Signal amplification circuit 22 adopts the discrete element to form two-stage small-signal amplifying circuit, the first order adopts the cobasis that frequency characteristic is better and input impedance is lower-common collector, wherein one road circuit is made up of resistance R 21, resistance R 22, capacitor C 21 and integrated circuit U11, and integrated circuit U11 selects 2/5 CA3083 for use; The second level has adopted the emitter-base bandgap grading biasing circuit to carry out temperature-compensating, and wherein one road circuit is made up of capacitor C 22, capacitor C 31, capacitor C 41, resistance R 31, resistance R 32, resistance R 41, resistance R 42, resistance R 43 and triode Q11, and triode Q11 selects 2N4403 for use.
3, integer: signal transformation circuit 23 adopts four voltage comparator U51, and four voltage comparator U51 select the LM339 chip for use.Signal carries out shaping to signal after amplifying, and makes its standard more, is handled by subsequent conditioning circuit easily.
4, pulse stretching: shaping circuit output signal pulses width narrower (microsecond level), in order to improve the reliability of signal transmission, carry out broadening with this pulse signal.Pulse stretching treatment circuit 24 adopts and triggers monostable flipflop U7 and U6 again, triggers monostable flipflop U7 and U6 again and selects the MC14538 chip for use.
Handle by 1,2,3,4 control signal, make that to the utlity model has antijamming capability strong, the characteristics that working range is wide.The utility model passes through modulation circuit cleverly, makes to adopt the photocell of low price to become possibility as photoelectric sensor, thereby has reduced cost significantly.
It should be noted that at last: above embodiment only in order to the explanation the utility model and and the described technical scheme of unrestricted the utility model; Therefore, although this specification has been described in detail the utility model with reference to each above-mentioned embodiment,, those of ordinary skill in the art should be appreciated that still and can make amendment or be equal to replacement the utility model; And all do not break away from the technical scheme and the improvement thereof of spirit and scope of the present utility model, and it all should be encompassed in the middle of the claim scope of the present utility model.
Claims (7)
1, a kind of laser pickoff that is used for laser leveling system, it comprises photoelectric sensor, signal conditioning circuit plate and shell, it is characterized in that: described signal conditioning circuit plate is provided with signal amplitude modulation circuit, signal amplification circuit, signal transformation circuit, pulse stretching treatment circuit, power circuit and is used to connect the lead-out terminal of controller; Described photoelectric sensor comprises silicon photocell that is installed on signal conditioning circuit plate both sides and the light filter that is installed on the silicon photocell photosensitive surface.
2, the laser pickoff that is used for laser leveling system according to claim 1, it is characterized in that: the both sides of described signal conditioning circuit plate are provided with metallic support along lateral direction upward, and described metallic support position therebetween bends to the inside; Described silicon photocell is installed on the metallic support.
3, the laser pickoff that is used for laser leveling system according to claim 2 is characterized in that: the extended line angle of described metallic support and signal conditioning circuit plate is 45 °.
4, the laser pickoff that is used for laser leveling system according to claim 2 is characterized in that: described metallic support position bending angle therebetween is 90 °.
5, the laser pickoff that is used for laser leveling system according to claim 2, it is characterized in that: described silicon photocell has 32, be divided into 8 groups, every group of 4 silicon photocell are located at respectively on each plane of both sides metallic support of signal conditioning circuit plate.
6, according to each described laser pickoff that is used for laser leveling system of claim 1～5, it is characterized in that: described light filter is the red glass of surface coating.
7, according to each described laser pickoff that is used for laser leveling system of claim 1～5, it is characterized in that: between described signal conditioning circuit plate and the shell rubber blanket is installed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420066308 CN2720787Y (en) | 2004-06-17 | 2004-06-17 | Laser receiver for levelling ground system controlled by laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420066308 CN2720787Y (en) | 2004-06-17 | 2004-06-17 | Laser receiver for levelling ground system controlled by laser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2720787Y true CN2720787Y (en) | 2005-08-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200420066308 Expired - Fee Related CN2720787Y (en) | 2004-06-17 | 2004-06-17 | Laser receiver for levelling ground system controlled by laser |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101960941A (en) * | 2010-08-25 | 2011-02-02 | 中国农业大学 | Laser control land leveling receiver circuit |
| CN102607537A (en) * | 2012-02-24 | 2012-07-25 | 苏州亿帝电子科技有限公司 | Laser receiver with adjustable reception precision |
| CN103168515A (en) * | 2011-12-23 | 2013-06-26 | 河北农业大学 | Greenhouse direct current power-driven rotary flattening machine |
| CN106258025A (en) * | 2016-07-27 | 2017-01-04 | 武汉大学 | Laser pickoff and installation testing method in the laser flatting machine of a kind of farmland |
| CN106556381A (en) * | 2015-09-28 | 2017-04-05 | 苏州亿帝电子科技有限公司 | Laser pickoff |
| CN106612646A (en) * | 2016-11-14 | 2017-05-10 | 华南农业大学 | Laser receiver having digital filtering function and used for farmland leveler |
| CN110645827A (en) * | 2019-08-21 | 2020-01-03 | 北京华如科技股份有限公司 | Scattering type omnidirectional laser signal receiving device and harness |
-
2004
- 2004-06-17 CN CN 200420066308 patent/CN2720787Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101960941A (en) * | 2010-08-25 | 2011-02-02 | 中国农业大学 | Laser control land leveling receiver circuit |
| CN103168515A (en) * | 2011-12-23 | 2013-06-26 | 河北农业大学 | Greenhouse direct current power-driven rotary flattening machine |
| CN102607537A (en) * | 2012-02-24 | 2012-07-25 | 苏州亿帝电子科技有限公司 | Laser receiver with adjustable reception precision |
| CN106556381A (en) * | 2015-09-28 | 2017-04-05 | 苏州亿帝电子科技有限公司 | Laser pickoff |
| CN106556381B (en) * | 2015-09-28 | 2020-01-14 | 苏州亿帝电子科技有限公司 | Laser receiver |
| CN106258025A (en) * | 2016-07-27 | 2017-01-04 | 武汉大学 | Laser pickoff and installation testing method in the laser flatting machine of a kind of farmland |
| CN106612646A (en) * | 2016-11-14 | 2017-05-10 | 华南农业大学 | Laser receiver having digital filtering function and used for farmland leveler |
| CN110645827A (en) * | 2019-08-21 | 2020-01-03 | 北京华如科技股份有限公司 | Scattering type omnidirectional laser signal receiving device and harness |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |