CN205300496U - Transmission tower space node positioner - Google Patents
Transmission tower space node positioner Download PDFInfo
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- CN205300496U CN205300496U CN201520982014.8U CN201520982014U CN205300496U CN 205300496 U CN205300496 U CN 205300496U CN 201520982014 U CN201520982014 U CN 201520982014U CN 205300496 U CN205300496 U CN 205300496U
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Abstract
The utility model discloses a transmission tower space node positioner. Wherein, the device includes: laser rangefinder, universal cloud platform, electron compass handles the chip, handle the chip and receive the angle of elevation and the course angle that straight -line distance that laser rangefinder recorded and electron compass recorded, then output is by the space coordinate of survey node. The utility model provides a transmission tower space node positioner has solved in the correlation technique transmission tower and has measured the scheme and can't compromise measurement accuracy and problem easy and simple to handle, can be used to the space coordinate's of the crucial node of transmission tower pointwise location, still can be used to measure transmission tower overall structure's the deformation condition, and its institute surveys deformation data and can be used to the analysis of shaft tower running state, declares broken rod tower safe coefficient, simple and practical, and convenient to carry has improved measurement accuracy 0.
Description
Technical field
This utility model relates to processing chip secure technical field, particularly relates to a kind of transmission tower space nodes positioner.
Background technology
Transmission tower refers mainly to reinforced concrete pole, steel pipe pole and shaft tower. Shaft tower is used for supporting wire, earth system in transmission line of electricity, makes between wire, ground wire and ground, and all keeps safe distance between wire, ground wire. In transmission line of electricity, the proportion of transmission tower the line is busy road gross investment is relatively big, plays very important effect in the transmission of electric power energy, and its safety and reliability can directly influence the safety and stablization of whole power system.
Along with popularization and the application of the construction of China's extra-high voltage grid and the new technology of transmission of electricity such as multi-circuit lines on the same tower, compact line, large-section lead, the trend that the big load of transmission tower the maximizes utility model that heals shows. Large-scale transmission tower is the carrier of big load electric energy conveying, particularly large span power transmission tower, there is the features such as tower body height, span is big, flexibility is big, the environmental loads such as earthquake, wind and wire icing are quick on the draw, the deformation of various ways may be produced, it is easy to the dynamic collapse under vibrating fatigue damage and extreme condition occurs. Therefore, transmission tower should have enough intensity to ensure the properly functioning of transmission system.
At present, multiple effective deformation test technology has application in transmission tower deformation monitoring, but due to its factor such as operation principle, technical merit, these technology still suffer from certain limitation. Early stage, this detection mode speed was slow, and accuracy is low, and particularly when hazard weather, manual inspection has very big difficulty to the monitoring of transmission tower mainly by the mode of manual inspection. Along with the application of the development of electric detecting technology, displacement transducer and foil gauge substantially increases the accuracy of measurement. But, this testing scheme belongs to contact type measurement, has that sampled point range limited, sensor is limited, be subject to the shortcomings such as external environment condition interference, simultaneously sensor and connect the deadweight of wire and can strengthen the heavy burden of tower structure, thus affecting test result. Optical survey instrument (such as level gauge, total powerstation etc.) is although higher certainty of measurement can be provided, but its detection range is limited, and volume is relatively big, inconvenient to carry.
Certainty of measurement and problem easy and simple to handle cannot be taken into account for transmission tower measurement scheme in correlation technique, not yet propose effective solution at present.
Utility model content
This utility model provides a kind of transmission tower space nodes positioner, cannot take into account certainty of measurement and problem easy and simple to handle at least solving transmission tower measurement scheme in correlation technique.
According to an aspect of the present utility model, provide a kind of transmission tower space nodes positioner, wherein, this device includes: laser ranging system, for by launching the air line distance that the mode of laser beam is measured on the photocentre of described laser beam and described transmission tower between at least one tested node; Universal turning bench, is arranged on the lower section of described laser ranging system, and for adjusting the turned position of described laser ranging system, the direction to ensure described laser beam is directed at described tested node; Electronic compass, embeds the side of described universal turning bench, and is positioned at the underface of the laser beam exit of described laser ranging system, for measuring the elevation angle between described photocentre and described tested node and course angle; Process chip, be connected to described laser ranging system, described electronic compass, receive described air line distance, the described elevation angle and described course angle, and export the space coordinates of described tested node.
Preferably, described transmission tower space nodes positioner also includes: universal turning bench level indicator, is arranged on the side of described universal turning bench, can adjust described universal turning bench to level by adjusting the bubble position of described universal turning bench level indicator.
Preferably, described transmission tower space nodes positioner also includes: universal turning bench base, is arranged on below described universal turning bench, is used for supporting described universal turning bench.
Preferably, described universal turning bench also includes: multi-directional ball, is arranged on the bottom of described universal turning bench, embeds in described universal turning bench base, by controlling the position of universal turning bench described in the rotation adjustable of described multi-directional ball.
Preferably, described transmission tower space nodes positioner also includes: universal turning bench tightening knob, is arranged on described universal turning bench base, for controlling the rotation of described multi-directional ball, is fastened on described universal turning bench base by described universal turning bench.
Preferably, described transmission tower space nodes positioner also includes: base level indicator, is arranged on the side of described universal turning bench base, can adjust described universal turning bench base to level by adjusting the bubble position of described base level indicator.
Preferably, described transmission tower space nodes positioner also includes: elevating lever, is arranged on the lower section of described universal turning bench base, for the height by the described universal turning bench of flexible adjustment of described elevating lever.
Preferably, described transmission tower space nodes positioner also includes: connects knob, is arranged on the top of described elevating lever, is used for connecting described universal turning bench base and described elevating lever.
Preferably, described transmission tower space nodes positioner also includes: elevating lever tightening knob, is arranged on described elevating lever, for controlling the flexible of described elevating lever.
Preferably, described transmission tower space nodes positioner also includes: base tightening knob, is arranged on described elevating lever, for described universal turning bench base is fastened on described elevating lever.
Preferably, described transmission tower space nodes positioner also includes: spider, is arranged on the lower section of described elevating lever, supports described transmission tower space nodes positioner by the length and angle adjusting described spider.
The transmission tower space nodes positioner that this utility model provides, can be used for the pointwise of the space coordinates of transmission tower key node location, can be additionally used in the measurement integrally-built deformation of transmission tower, its surveyed deformation data can be used for pole tower operation state analysis, judge shaft tower safe coefficient, simple and practical, easy to carry, improve accuracy of measurement.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing being further appreciated by of the present utility model, constitutes the part of the application, and schematic description and description of the present utility model is used for explaining this utility model, is not intended that restriction of the present utility model. In the accompanying drawings:
Fig. 1 is the structural representation of the transmission tower space nodes positioner according to this utility model embodiment one;
Fig. 2 is the preferred structure schematic diagram of the transmission tower space nodes positioner according to this utility model embodiment one;
Fig. 3 is the space coordinates schematic diagram of the node according to this utility model embodiment one;
Fig. 4 is the transmission tower schematic diagram according to this utility model embodiment three.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is clearly and completely described, it is clear that described embodiment is only a part of embodiment of this utility model, rather than whole embodiments. Based on embodiment of the present utility model, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into protection domain of the present utility model.
Embodiment one
Present embodiments providing a kind of transmission tower space nodes positioner, Fig. 1 is the structural representation of the transmission tower space nodes positioner according to this utility model embodiment one, as it is shown in figure 1, transmission tower space nodes positioner includes:
Laser ranging system 1, for by launching on the photocentre of mode Laser Measurement bundle of laser beam and transmission tower the air line distance between at least one tested node;
Universal turning bench 2, it is possible to be called ball-shaped cloud platform, is arranged on the lower section of laser ranging system 1, and for adjusting the turned position of laser ranging system 1, the direction to ensure laser beam is directed at tested node;
Electronic compass 3, embed the side of universal turning bench 2, and it is positioned at the underface of the laser beam exit (i.e. the round exit of the side of laser ranging system 1 shown in Fig. 1) of laser ranging system 1, for measuring the elevation angle between photocentre and tested node and course angle;
Process chip 4, be connected to laser ranging system 1, electronic compass 3, receive air line distance, the elevation angle and course angle, and export the space coordinates of tested node; These space coordinates are with the photocentre of above-mentioned laser beam for zero.
By above-mentioned transmission tower space nodes positioner, can be used for the pointwise of the space coordinates of transmission tower key node location, can be additionally used in the measurement integrally-built deformation of transmission tower, its surveyed deformation data can be used for pole tower operation state analysis, judge shaft tower safe coefficient, simple and practical, easy to carry, improve accuracy of measurement.
Fig. 2 is the preferred structure schematic diagram of the transmission tower space nodes positioner according to this utility model embodiment one, as in figure 2 it is shown, transmission tower space nodes positioner is additionally provided with following several hardware cell:
In one embodiment, in order to the convenient position adjusting universal turning bench 2 is at level, present embodiments provide a kind of preferred implementation, transmission tower space nodes positioner also includes: universal turning bench level indicator 5, it is arranged on the side of universal turning bench 2, universal turning bench 2 can be adjusted to level by adjusting the bubble position of universal turning bench level indicator 5. In actual mechanical process, when bubble is in center, then it represents that universal turning bench 2 is modulated to level, thus the convenient position adjusting laser ranging system 1 is put down, it is ensured that accuracy of measurement.
In one embodiment, in order to consolidate universal turning bench, present embodiments providing a kind of preferred implementation, transmission tower space nodes positioner also includes: universal turning bench base 6, is arranged on below universal turning bench 2, is used for supporting universal turning bench 2.
In one embodiment, universal turning bench 2 also includes: multi-directional ball 7, is arranged on the bottom of universal turning bench 2, embeds in universal turning bench base 6, by controlling the position of the rotation adjustable universal turning bench 2 of multi-directional ball 7. Thus controlling the rotation of universal turning bench 2, it is ensured that the direction of the laser beam of laser ranging system 1 is directed at tested node, improve accuracy of measurement.
In one embodiment, in order to be fastened on universal turning bench base 6 by universal turning bench 2, transmission tower space nodes positioner also includes: universal turning bench tightening knob 8, is arranged on universal turning bench base 6, for controlling the rotation of multi-directional ball 7, universal turning bench 2 is fastened on universal turning bench base 6. Unclamp universal turning bench tightening knob 8, multi-directional ball 7 can be made arbitrarily to rotate, thus freely adjusting the rotational angle of universal turning bench 2; After universal turning bench 2 adjusts correct position, tighten universal turning bench tightening knob 8, thus fixing universal turning bench 2.
In one embodiment, in order to the convenient position adjusting universal turning bench base 6 is at level, present embodiments provide a kind of preferred implementation, transmission tower space nodes positioner also includes: base level indicator 9, it is arranged on the side of universal turning bench base 6, universal turning bench base 6 can be adjusted to level by adjusting the bubble position of base level indicator 9. Thus ensureing to keep the firm of transmission tower space nodes positioner entirety center of gravity.
In one embodiment, transmission tower space nodes positioner also includes: elevating lever 10, is arranged on the lower section of universal turning bench base 6, for the height by the flexible adjustment universal turning bench 2 of elevating lever 10, consequently facilitating the operation of survey crew.
In one embodiment, transmission tower space nodes positioner also includes: connects knob 11, is arranged on the top of elevating lever 10, is used for connecting universal turning bench base 6 and elevating lever 10, by the connection separable universal turning bench base 6 of knob 11 and the elevating lever 10 outwarded winding, easy disassembly is carried.
In one embodiment, transmission tower space nodes positioner also includes: elevating lever tightening knob 12, is arranged on elevating lever, for controlling the flexible of elevating lever. Unclamp elevating lever tightening knob 12, the height of adjustable lifting bar 10. Tighten elevating lever tightening knob 12, elevating lever 10 can be fixed.
In one embodiment, universal turning bench base 6 can around elevating lever 10 axial rotation, in order to control the random rotation of universal turning bench base 6, present embodiments provide a kind of preferred implementation, namely transmission tower space nodes positioner also includes: base tightening knob 13, it is arranged on elevating lever 10, for universal turning bench base 6 is fastened on elevating lever 10. Unclamping base tightening knob 13, universal turning bench base 6 arbitrarily can rotate around elevating lever 10, thus adjusting the direction of the laser beam of laser ranging system 1; Tighten base tightening knob 13, it is possible to the axial rotation of restriction universal turning bench base 6.
In one embodiment, in order to facilitate measurement requirement for height during practical operation, present embodiments provide a kind of preferred implementation, namely transmission tower space nodes positioner also includes: spider 14, it is arranged on the lower section of elevating lever 10, supports transmission tower space nodes positioner by the length and angle adjusting spider 14.
In transmission tower space nodes positioner shown in Fig. 2, the support length of spider and opening angle all can manually adjust, it is adaptable to rugged ground, when, after base level indicator display level, expression is adjusted in place.More preferably, in order to ensure the firm of transmission tower space nodes positioner, fixing device (such as bolt etc.) can be set at the end of spider, thus fixing on the ground, it is ensured that during the measurement of location, transmission tower space nodes positioner is firm.
In the transmission tower space nodes positioner that the present embodiment provides, core devices includes laser ranging system and electronic compass, below laser ranging system and electronic compass is described in detail respectively.
(1) laser ranging (laserdistancemeasuring) is to find range using laser instrument as light source. Mode according to laser work is divided into continuous wave laser and pulse laser. The gas lasers such as He-Ne, argon ion, krypton cadmium work in continuous output state, for phase laser distance measurement; Double; two heterogeneous gallium arsenide semiconductor laser instrument, for infrared distance measurement; The solid state laser such as ruby, neodymium glass, finds range for pulse type laser. Laser range finder, due to the feature such as good, the high directivity of monochromaticity of laser, adds that electronic circuit semiconductor transformation is integrated, compared with geodimeter, is possible not only to day and night operation and can improve range accuracy, substantially reduce weight and power consumption. Laser range finder is generally adopted two ways to measure distance: impulse method and phase method.
The principle of impulse method ranging technology is: the laser that diastimeter is launched is received by diastimeter again after the reflection of object being measured, the diastimeter time that recording laser comes and goes simultaneously. The half of the product of the light velocity and two-way time, it is simply that the distance between diastimeter and object being measured.
The principle of ranging phase method technology is: adopt the laser of radio wave band frequency to carry out amplitude modulation(PAM), and electroencephalogram is come and gone measuring difference of phases produced by diastimeter and object spacing, according to wavelength and the frequency of modulating light, converse laser time of flight, then calculate testing distance successively. Former for laser road, it is generally required to place reflecting mirror at determinand place, is reflected back laser range finder by the program, the mirror ripple device of receiver module be received processing.
Laser ranging system in the present embodiment, can need to be equipped with pulse type laser range unit or phase laser distance measurement device according to range, also can select Handheld laser range unit or formula laser ranging system of looking in the distance according to the difference measuring distance. Specifically chosen determine according to practical situation.
(2) electronic compass, also known as digital compass, in modern technologies condition, electronic compass is widely used as navigation instrument or attitude transducer. Shelf structure compass phase specific energy consumption is low, volume is little, lightweight, precision is high for electronic compass and conventional cursor formula and balance, Miniaturized, its output signal can realize digital-scroll technique by process, being possible not only to for pointing to, its digital signal can be directly sent to autopilot, controls the manipulation of boats and ships. At present, widely used is three axle strapdown reluctance type Digital Magnetic Compass, this compass has anti-shake and vibration resistance, course precision is higher, interference field has electronic compensation, be desirably integrated in control loop and carry out the advantages such as data link, thus is widely used in the fields such as Aeronautics and Astronautics, robot, navigation, vehicular autonomous navigation.
Development along with microelectronics integrated technology and processing technique, material technology. The research manufacture of digital compass has also reached a unprecedented level with using. Current digital compass is according to can be divided into flat digital compass and 3-dimensional digital compass with or without pour angle compensation, it is also possible to be divided into magnetoresistive effect sensor, hall effect sensor and fluxgate sensor according to the difference of sensor. From the comparison of three, the electronic compass being currently based on magnetic resistance sensor has the advantages such as little, the fast response time of volume, and it is with the obvious advantage, is the developing direction of electronic compass.
Electronic compass in the present embodiment can select any one according to demand, it is preferable that the optional electronic compass based on magnetic resistance sensor.
Fig. 3 is the space coordinates schematic diagram of the node according to this utility model embodiment one, as shown in Figure 3, with the photocentre of the laser beam of laser ranging system for zero O, set up X-Y-Z coordinate system, assume the locus that P point is tested node, L represents the air line distance between O point and the P point that laser ranging system is surveyedRepresenting the elevation angle that electronic compass is surveyed, �� represents the course angle that electronic compass is surveyed. Process chip and receive air line distance, the elevation angle and course angle, it is possible to calculated the space coordinates exporting tested node by below equation:
Wherein, x represents the x-axis coordinate of tested node, and y represents the y-axis coordinate of tested node, and z represents the z-axis coordinate of tested node.
In order to above-mentioned transmission tower space nodes positioner is carried out apparent explanation, illustrate below in conjunction with specific embodiment, however, it should be noted that this embodiment is merely to be better described this utility model, it is not intended that and this utility model is limited improperly.
Embodiment two
Fig. 4 is the transmission tower schematic diagram according to this utility model embodiment three, as shown in Figure 4, chooses A-H in figure and amounts to 8 key node measurements. Use transmission tower space nodes positioner to above-mentioned 8 node locating, realized by following steps:
Step 1, adjusts spider, observes base level indicator, unclamps base tightening knob, adjusted to horizontal level by universal turning bench base and tighten base tightening knob;
Step 2, unclamps elevating lever knob, adjusts elevating lever to suitably height (facilitating the angle that test man operates), tightens elevating lever knob;
Step 3, unclamps universal turning bench tightening knob, observes universal turning bench level indicator, is adjusted to level by universal turning bench and tighten universal turning bench tightening knob;
Step 4, is connected to process chip by electronic compass, laser ranging system, opens electronic compass and laser ranging system;
Step 5, by electronic compass zeros data, now gives tacit consent to the zero that photocentre is reference frame of the laser beam of laser ranging system;
Step 6, unclamps universal turning bench tightening knob, adjusts the direction of universal turning bench, so that the laser beam of laser ranging system accurately irradiates the tested node A on transmission tower;
Step 7, tighten universal turning bench tightening knob, use processes chip and reads distance value (the air line distance value between above-mentioned photocentre and tested node A) measured by laser ranging system, reads angle value measured by electronic compass (elevation value and course angle value) between above-mentioned photocentre and tested node A;
Step 8, according to above-mentioned distance value and angle value, use processes chip and calculates the space coordinates of tested node A;
The like, repeat step 6-step 8, until all calculating complete by the space coordinates of node A-H.
Due to using the photocentre of laser beam as coordinate origin, therefore can determine the position of node A-H based on the space coordinates of the node A-H calculated, thus can determine that transmission tower deformation before and after top deflection value. It is of course also possible to after calculating the space coordinates of a node (such as the node D shown in figure), zero is moved to node D by the position relationship based on node D with zero, then calculates the space coordinates of residue node. By the zero of space coordinates from after photocentre moves to node D, the spatial value of each node recorded is in Table 1.
Table 1 transmission tower key node and spatial value thereof
This utility model provides a kind of transmission tower space nodes positioner, mainly it is made up of laser ranging system, universal turning bench, electronic compass, process chip, it is capable of the space coordinates of each key node of transmission tower is carried out pointwise location, it is possible to measure the top deflection value before and after electric pole load deflection.This utility model uses laser distance measuring principle measurement, is a kind of non-contact testing scheme, and convenient to operation, good portability, certainty of measurement is higher.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments " or " concrete example " etc. means in conjunction with this embodiment or example describe are contained at least one embodiment of the present utility model or example. In this manual, the schematic representation of above-mentioned term is not necessarily referring to identical embodiment or example. And, the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiments or example.
Particular embodiments described above; the purpose of this utility model, technical scheme and beneficial effect have been further described; it is it should be understood that; the foregoing is only specific embodiment of the utility model; it is not used to limit protection domain of the present utility model; all within spirit of the present utility model and principle, any amendment of making, equivalent replacement, improvement etc., should be included within protection domain of the present utility model.
Claims (11)
1. a transmission tower space nodes positioner, it is characterised in that including:
Laser ranging system, for by launching the air line distance that the mode of laser beam is measured on the photocentre of described laser beam and described transmission tower between at least one tested node;
Universal turning bench, is arranged on the lower section of described laser ranging system, and for adjusting the turned position of described laser ranging system, the direction to ensure described laser beam is directed at described tested node;
Electronic compass, embeds the side of described universal turning bench, and is positioned at the underface of the laser beam exit of described laser ranging system, for measuring the elevation angle between described photocentre and described tested node and course angle;
Process chip, be connected to described laser ranging system, described electronic compass, receive described air line distance, the described elevation angle and described course angle, and export the space coordinates of described tested node.
2. transmission tower space nodes positioner according to claim 1, it is characterised in that described transmission tower space nodes positioner also includes:
Universal turning bench level indicator, is arranged on the side of described universal turning bench, can adjust described universal turning bench to level by adjusting the bubble position of described universal turning bench level indicator.
3. transmission tower space nodes positioner according to claim 1, it is characterised in that described transmission tower space nodes positioner also includes:
Universal turning bench base, is arranged on below described universal turning bench, is used for supporting described universal turning bench.
4. transmission tower space nodes positioner according to claim 3, it is characterised in that described universal turning bench also includes:
Multi-directional ball, is arranged on the bottom of described universal turning bench, embeds in described universal turning bench base, by controlling the position of universal turning bench described in the rotation adjustable of described multi-directional ball.
5. transmission tower space nodes positioner according to claim 4, it is characterised in that described transmission tower space nodes positioner also includes:
Universal turning bench tightening knob, is arranged on described universal turning bench base, for controlling the rotation of described multi-directional ball, is fastened on described universal turning bench base by described universal turning bench.
6. transmission tower space nodes positioner according to claim 3, it is characterised in that described transmission tower space nodes positioner also includes:
Base level indicator, is arranged on the side of described universal turning bench base, can adjust described universal turning bench base to level by adjusting the bubble position of described base level indicator.
7. transmission tower space nodes positioner according to claim 3, it is characterised in that described transmission tower space nodes positioner also includes:
Elevating lever, is arranged on the lower section of described universal turning bench base, for the height by the described universal turning bench of flexible adjustment of described elevating lever.
8. transmission tower space nodes positioner according to claim 7, it is characterised in that described transmission tower space nodes positioner also includes:
Connect knob, be arranged on the top of described elevating lever, be used for connecting described universal turning bench base and described elevating lever.
9. transmission tower space nodes positioner according to claim 7, it is characterised in that described transmission tower space nodes positioner also includes:
Elevating lever tightening knob, is arranged on described elevating lever, for controlling the flexible of described elevating lever.
10. transmission tower space nodes positioner according to claim 7, it is characterised in that described transmission tower space nodes positioner also includes:
Base tightening knob, is arranged on described elevating lever, for described universal turning bench base is fastened on described elevating lever.
11. transmission tower space nodes positioner according to claim 7, it is characterised in that described transmission tower space nodes positioner also includes:
Spider, is arranged on the lower section of described elevating lever, supports described transmission tower space nodes positioner by the length and angle adjusting described spider.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106093960A (en) * | 2016-07-29 | 2016-11-09 | 贵州师范大学 | A kind of karst plateau alpine terrain length of grade measuring method and measuring instrument |
| CN108358011A (en) * | 2018-04-25 | 2018-08-03 | 大连华齐泰精密仪器有限公司 | Staircase speed, sync rates, braking distance detection device |
| CN109343072A (en) * | 2018-11-09 | 2019-02-15 | 刘雪莹 | Laser range finder |
| CN110877144A (en) * | 2019-10-23 | 2020-03-13 | 佛山科学技术学院 | Infrared on-line measuring device of welding temperature field |
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2015
- 2015-12-03 CN CN201520982014.8U patent/CN205300496U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106093960A (en) * | 2016-07-29 | 2016-11-09 | 贵州师范大学 | A kind of karst plateau alpine terrain length of grade measuring method and measuring instrument |
| CN108358011A (en) * | 2018-04-25 | 2018-08-03 | 大连华齐泰精密仪器有限公司 | Staircase speed, sync rates, braking distance detection device |
| CN109343072A (en) * | 2018-11-09 | 2019-02-15 | 刘雪莹 | Laser range finder |
| CN110877144A (en) * | 2019-10-23 | 2020-03-13 | 佛山科学技术学院 | Infrared on-line measuring device of welding temperature field |
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