CN108761477B

CN108761477B - Non-contact network parameter acquisition device, measurement system and measurement method adopting digital laser technology

Info

Publication number: CN108761477B
Application number: CN201810845270.0A
Authority: CN
Inventors: 严上均; 肖国祥; 黄伟; 李然; 赵强; 徐平
Original assignee: Chengdu Cihai Electric Engineering Co ltd
Current assignee: Chengdu Cihai Electric Engineering Co ltd
Priority date: 2018-07-27
Filing date: 2018-07-27
Publication date: 2023-12-19
Anticipated expiration: 2038-07-27
Also published as: CN108761477A

Abstract

The invention relates to the technical field of track catenary detection equipment, and discloses a non-contact catenary parameter acquisition device, a measurement system and a measurement method thereof by adopting a digital laser technology. According to the invention, under the condition that the data acquisition vehicle is not stopped, on one hand, the rod number data of the nearest contact net support rod can be automatically determined according to the contact net support rod identification result and the real-time vehicle journey, and on the other hand, the contact net parameters comprising the contact net wire pull-out value, the wire height and the like can be calculated and acquired by combining the laser scanner, the track gauge sensor and the inclination angle sensor, and the fault position can be automatically found through data storage, data display and data overrun detection, so that the detection efficiency is further improved, the time is saved, and the labor cost is reduced. In addition, by the built-in measurement data playback software system, application purposes such as data playback, data analysis and data correction on measurement data can be realized, and automation of later data analysis is ensured.

Description

Non-contact network parameter acquisition device, measurement system and measurement method adopting digital laser technology

Technical Field

The invention belongs to the technical field of track contact net detection equipment, and particularly relates to a non-contact net parameter acquisition device, a measurement system and a measurement method thereof by adopting a digital laser technology.

Background

In recent years, the development of railways in China is rapid, safety is the most important index for measuring comprehensive operation quality in the railway transportation production process in China, traditional data detection equipment is difficult to adapt to the safety development requirements of high-speed rails, common rails, subways and the like, wherein a contact net (which is a special type of power transmission line for supplying power to an electric locomotive and is erected along the upper space of a railway line) mainly comprises a contact hanger, a supporting device, a positioning device, a strut rod and a fixed foundation, wherein the contact hanger comprises a contact line, a hanger, a carrier cable, a connecting part and an insulator, the contact hanger is erected on the strut by the supporting device, the function of the contact hanger is to transmit electric energy obtained from traction power transformation to the electric locomotive through the supporting device, and the detection of multiple parameters such as wire pull-out values (including non-support), wire heights, carrier cables (distance from the rail surface), anchor joints, hanger spans, track gauges, outer rail superelevation, side limits, wire gradients (height difference between positioning and positioning), height difference between the hanger and wire fork, wire height difference (height difference between the positioning and the hanger, wire fork, wire height difference between the two ends and wire fork height difference between the two wire fork rod and the wire height is particularly at 500 mm.

At present, portable overhead line system detection equipment (such as portable overhead line system measuring instruments such as a track gauge) based on point laser and infrared technology is commonly used in China to manually measure multiple parameters of an overhead line system, namely, when the portable overhead line system detection equipment is moved to the position of a overhead line system support post, the multiple parameters of the overhead line system are measured according to the following steps: (1) first determining the number of the strut rod; (2) Then squatting down to place the contact net measuring instrument, and adjusting the position of the measuring instrument according to the position of the locator; (3) After the measuring instrument is placed, the measuring lens is adjusted to make the detection light spot hit the contact line; and (4) clicking the measuring instrument for confirmation, and reading out the data. Therefore, a lot of time is wasted, the project progress is greatly influenced, and the construction period is delayed. Meanwhile, as railway maintenance is carried out at a skylight point, the skylight point is short in time, the traditional detection means can further lead to long consumption of measuring parameters of the overhead line system, low efficiency and difficulty in adapting to social development requirements, and especially as the railway industry of China rapidly develops, mileage is continuously increased, and new line acceptance and daily maintenance workload of railway construction are rapidly increased.

Disclosure of Invention

In order to solve the problems of poor automation degree, low efficiency and time waste of data detection in the prior art, the invention aims to provide a non-contact type overhead line system parameter acquisition device, a measurement system and a measurement method thereof by adopting a digital laser technology.

The technical scheme adopted by the invention is as follows:

the non-contact type contact network parameter acquisition device comprises a data acquisition vehicle, first laser distance sensors, a first differential circuit unit, a first single chip microcomputer processing circuit unit, a pulse encoder, a clock pulse generation circuit unit, a movement direction judging circuit unit, a reversible counting circuit unit, a second single chip microcomputer processing circuit unit and an output interface circuit unit, wherein the number of the first laser distance sensors is two and is respectively arranged at two sides of the travelling direction of the data acquisition vehicle, the laser receiving and transmitting directions of the first laser distance sensors are respectively and vertically upwards, and the pulse encoder is arranged on a travelling wheel rotating shaft of the data acquisition vehicle;

the switching value output end of the first laser distance sensor is electrically connected with the input end of the first differential circuit unit, and the output end of the first differential circuit unit is electrically connected with the input end of the first singlechip processing circuit unit to form a contact net strut bar recognition result data acquisition branch;

the phase A signal output end of the pulse encoder, the phase B signal output end of the pulse encoder and the output end of the clock pulse generation circuit unit are respectively and electrically connected with three input ends of the motion direction distinguishing circuit unit, the output end of the motion direction distinguishing circuit unit is electrically connected with the input end of the reversible counting circuit unit, and the output end of the reversible counting circuit unit is electrically connected with the input end of the second singlechip processing circuit unit to form a vehicle range data acquisition branch;

The output end of the first single-chip microcomputer processing circuit unit and the output end of the second single-chip microcomputer processing circuit unit are respectively and electrically connected with the output interface circuit unit.

The optimized system also comprises a second laser distance sensor, an A/D sampling circuit unit, a digital filter circuit unit and an OR gate circuit unit, wherein the number of the second laser distance sensors is two and the second laser distance sensors are respectively arranged at two sides of the running direction of the data acquisition vehicle, and the laser receiving and transmitting directions of the second laser distance sensors are respectively and vertically upwards;

the analog output end of the second laser distance sensor is electrically connected with the input end of the A/D sampling circuit unit, the output end of the A/D sampling circuit unit is electrically connected with the input end of the digital filter circuit unit, the output end of the digital filter circuit unit and the output end of the first differential circuit unit are respectively and electrically connected with the two input ends of the OR gate circuit unit, and the output end of the OR gate circuit unit is electrically connected with the input end of the first singlechip processing circuit unit.

Further optimized, the system also comprises a manual key and a second differential circuit unit, wherein the manual key is arranged on the data acquisition vehicle;

The output end of the manual key is electrically connected with the input end of the second differential circuit unit, and the output end of the second differential circuit unit is electrically connected with the third input end of the OR circuit unit.

The optimized speed counting circuit unit is connected with the output interface circuit unit through a first single chip microcomputer processing circuit unit;

the output end of the motion direction judging circuit unit is also electrically connected with the input end of the speed counting circuit unit, and the output end of the speed counting circuit unit is electrically connected with the input end of the third singlechip processing circuit unit to form a vehicle speed data acquisition branch.

The optimized motion direction distinguishing circuit unit comprises a first resistor R1, a second resistor R2, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a first NAND gate U1, a second NAND gate U2, a third NAND gate U3, an A-phase input end Pin_A used for being electrically connected with the A-phase signal output end, a B-phase input end Pin_B used for being electrically connected with the B-phase signal output end and a clock pulse input end Time used for being electrically connected with the output end of the clock pulse generating circuit unit;

The phase A input end Pin_A is electrically connected with the first end of the first resistor R1, the second end of the first resistor R1 is electrically connected with the first input end of the first NAND gate U1, and the second input end of the first NAND gate U1 is electrically connected with the clock pulse input end Time;

the phase B input end Pin_B is electrically connected with the first end of the second resistor R2, the second end of the second resistor R2 is electrically connected with the first input end of the second NAND gate U2, the second output end of the second NAND gate U2 is electrically connected with the first end of a third resistor R3, and the second end of the third resistor R3 is electrically connected with direct-current voltage;

the output end of the first nand gate U1 and the output end of the second nand gate U2 are respectively and electrically connected with two input ends of the third nand gate U3, and the output end of the third nand gate U3 is used as the output end Pout of the motion direction distinguishing circuit unit;

the first input end of the second nand gate U2 is further electrically connected to the cathode of the first diode D1 and the anode of the second diode D2, the output end of the third nand gate U3 is further electrically connected to the cathode of the third diode D3 and the anode of the fourth diode D4, the anode of the first diode D1 and the anode of the third diode D3 are grounded, and the cathode of the second diode D2 and the cathode of the fourth diode D4 are electrically connected to the dc voltage.

Further preferably, a direction distinguishing starting branch is further connected in series between the second end of the first resistor R1 and the first input end of the first nand gate U1, wherein the direction distinguishing starting branch comprises a fourth resistor R4, a fifth resistor R5, a fifth diode D5, a sixth diode D6, a capacitor C1, a triode Q1, a fourth nand gate U4 and a starting control input pin_sy;

the second end of the first resistor R1 is electrically connected to the first input end of the fourth nand gate U4, and the start control input end pin_sy is electrically connected to the first end of the third resistor R3, the cathode of the fifth diode D5 and the second input end of the fourth nand gate U4, respectively;

the output end of the fourth nand gate U4 is electrically connected to the anode of the fifth diode D5, the first end of the fourth resistor R4 and the base electrode of the triode Q1, the emitter electrode of the triode Q1 is electrically connected to the anode of the sixth diode D6, and the collector electrode of the triode Q1 is electrically connected to the first end of the fifth resistor R5 and the first input end of the first nand gate U1, respectively;

the second end of the fourth resistor R4, the second end of the fifth resistor R5 and the first end of the capacitor C1 are respectively and electrically connected to the dc voltage, and the second end of the capacitor C1 and the cathode of the sixth diode D6 are respectively grounded.

The other technical scheme adopted by the invention is as follows:

the non-contact type contact network parameter measurement system adopting the digital laser technology comprises a data center server, man-machine interaction equipment and a non-contact type contact network parameter acquisition device adopting the digital laser technology, wherein the input end of the data center server is electrically connected with an output interface circuit unit in the non-contact type contact network parameter acquisition device, and the output end of the data center server is electrically connected with the man-machine interaction equipment;

the data center server is internally provided with a measurement software system comprising a contact net strut bar identification result data interface, a train procedure data interface, a line database, a strut bar positioning module and a strut bar number determining module;

the contact net strut bar identification result data interface is used for importing contact net strut bar identification result data from the first singlechip processing circuit unit;

the program data interface is used for importing program data from the second singlechip processing circuit unit;

the line database is used for storing line data comprising line branch rod numbers, line names, line intervals, line branch rod numbers, a line location work area and/or a line belonging responsibility unit;

The strut positioning module is configured to, after receiving real-time strut identification result data of the strut identification result data interface of the overhead contact system and real-time range data from the range data interface, calculate, according to the real-time range data, a real-time moving distance from a current data acquisition vehicle position to a previous determined strut position, if the real-time moving distance is in a range of S-x to s+x, and the real-time strut identification result data indicates that a strut is currently identified, determine that the strut is an effective strut, and then determine, according to the strut number data of the previous determined strut and the line data from the line database, the strut number data of the effective strut, where the strut number data includes a line strut number corresponding to the strut and a line name, a line interval, a work area where the line belongs to and/or a responsibility unit where the line belongs to the overhead contact system, S is a design spacing of the strut, and x is an offset constant.

The system is optimized, and further comprises a laser scanner, a track gauge sensor and an inclination sensor which are arranged on the data acquisition vehicle, wherein a laser scanning surface of the laser scanner is positioned above the data acquisition vehicle and is vertical to the traveling direction of the data acquisition vehicle;

The output ends of the laser scanner, the track gauge sensor and the inclination angle sensor are respectively and electrically connected with the input end of the data center server;

the measuring software system in the data center server further comprises a laser scanner interface, a track gauge sensor interface, an inclination angle sensor interface, a coordinate system module, a calibration module, a compensation module, an overrun judging module, a data storage module and a display interface driving module;

the laser scanner interface is used for importing laser scanning data from a laser scanner;

the gauge sensor interface is used for importing gauge measurement data from a gauge sensor;

the inclination sensor interface is used for importing inclination measurement data from an inclination sensor;

the coordinate system module is used for converting the real-time scanning data from the laser scanner into rectangular coordinates from polar coordinates after receiving the real-time scanning data, classifying the real-time scanning data according to whether the real-time scanning data belong to the same obstacle, filtering interference data according to the number of continuous data points of the obstacle, and finally obtaining real-time wire pull-out values and real-time wire heights of the contact wire according to the rest real-time scanning data about the contact wire;

The calibration module is used for calculating original error data generated by machining according to the automatic measurement value and the manual measurement value when calibrating parameters;

the compensation module is used for respectively correcting and compensating the real-time wire pull-out value and the real-time wire height according to the real-time gauge measurement data from the gauge sensor, the real-time dip angle measurement data from the dip angle sensor and the original error data from the calibration module;

the overrun judging module is used for judging whether the real-time wire pull-out value and the real-time wire height exceed the limits, and if yes, the strut rod positioning module determines the nearest strut rod of the overhead contact system as a fault interval rod;

the data storage module is used for binding and storing the rod number data determined by the support rod positioning module, the compensated real-time wire pull-out value and the compensated real-time wire height;

the display interface driving module is used for driving the man-machine interaction equipment to output and display the latest real-time wire pull-out value, real-time wire height and rod number data, and/or outputting and displaying the real-time wire pull-out value, the real-time wire height and the rod number data corresponding to the fault interval rod.

Further preferably, the data center server is also internally provided with a measurement data playback software system comprising a storage read-write module, a line manager, a waveform data model, a graphical interface module, a command control module and an operation stack module;

The storage read-write module is used for reading and writing the historically measured rod number data and catenary parameters from the local data storage module and writing the corrected catenary parameters into the local data storage module;

the line manager is used for managing line data of a plurality of track lines, and is provided with a curve manager special for managing the line data of the track lines corresponding to each track line;

the waveform data model is used for converting the rod number data to be output and displayed and the parameters of the overhead line system into waveform images capable of being output and displayed according to the prefabricated model;

the graphical interface module is used for displaying the waveform image from the waveform data model and inputting an operation instruction manually generated by an operator, wherein the operation instruction comprises a correction instruction for contact network parameters and/or a control instruction for adjusting the display content of the waveform image;

the command control module is used for correcting the parameters of the contact network and/or adjusting the display content of the waveform image according to the operation instruction from the graphical interface module;

the operation stack module is used for recording all operation instructions and corresponding operation records.

The other technical scheme adopted by the invention is as follows:

A method for measuring a non-contact catenary parameter measurement system by using a digital laser technology as described above, comprising the following steps:

s101, receiving real-time scanning data from a laser scanner, and converting the real-time scanning data from polar coordinates to rectangular coordinates;

s102, classifying real-time scanning data according to whether the real-time scanning data belong to the same obstacle, filtering interference data according to the number of continuous data points of the obstacle, and finally obtaining the rest real-time scanning data which are the scanning data about the contact net wires;

s103, acquiring a real-time wire pull-out value and a real-time wire height of the contact wire according to the rest real-time scanning data;

s104, respectively correcting and compensating the real-time wire pull-out value and the real-time wire height according to real-time track gauge measurement data from a track gauge sensor, real-time inclination angle measurement data from an inclination angle sensor and original error data determined during calibration;

s105, determining whether the corresponding contact net wire is a contact wire or a carrier rope according to the height of the real-time wire, and if two contact wires appear, respectively calculating the real-time parallel distance and the real-time height difference between the two contact wires according to the pull-out value of the real-time wire and the height of the real-time wire of the corresponding contact wire;

S106, judging whether the real-time wire pull-out value, the real-time wire height, the real-time parallel spacing or the real-time height difference exceeds the limit, and if yes, taking the nearest contact net strut rod determined according to the real-time contact net strut rod identification result data and the real-time travel data as a fault interval rod.

The beneficial effects of the invention are as follows:

(1) The invention provides a novel acquisition device capable of fully automatically acquiring multiple parameters of a contact net, namely, under the condition that a data acquisition vehicle is not stopped, on one hand, a contact net branch rod identification result for determining the number of the contact net branch rod can be automatically acquired by utilizing a contact net branch rod identification result data acquisition branch, on the other hand, the moving direction of the data acquisition vehicle can be identified, and a real-time vehicle course of the data acquisition vehicle can be further acquired by utilizing a vehicle course data acquisition branch, and multiple parameters can be uniformly output through an output interface circuit unit, so that the nearest contact net branch rod number can be accurately determined together with the contact net branch rod identification result, the detection efficiency can be greatly improved, the time can be saved, the labor cost can be reduced, the increasing railway new line acceptance and the existing line daily maintenance requirement can be met, and the timely positioning of a newly discovered fault zone can be ensured;

(2) The gate circuit unit is arranged in the novel acquisition device, so that the recognition result of the contact net strut rod can be obtained based on a switching value detection mode, an analog value detection mode, a manual mode and the like, different use habits are met, and the application range is expanded;

(3) The invention also provides a novel measuring system capable of fully automatically collecting the multiple parameters of the overhead contact system and a measuring method thereof, which can automatically determine the rod number data of the nearest overhead contact system support rod according to the identification result and real-time travel of the overhead contact system support rod, and can also be combined with a laser scanner, a track gauge sensor and an inclination sensor to calculate and obtain overhead contact system parameters including the pull-out value of the overhead contact system wire, the wire height and the like, and can automatically store data, display the data and find out fault positions through data overrun detection, thereby further improving the detection efficiency, saving time and reducing the labor cost;

(5) By arranging the measurement data playback software system in the novel measurement system, the application purposes of performing data playback, data analysis, data correction and the like on the measurement data can be realized, and the automation of the later data analysis is ensured;

(6) The acquisition device and the measurement system also have the advantages of safety, reliability, high acquisition precision, easiness in debugging, simple circuit structure, low cost and the like, and are convenient for practical popularization and application.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a data acquisition vehicle provided by the invention.

Fig. 2 is a schematic circuit diagram of a first non-contact catenary parameter acquisition device according to the present invention.

Fig. 3 is a circuit diagram of a motion direction discriminating circuit unit provided by the present invention.

Fig. 4 is a schematic diagram of a first waveform of each node of the data acquisition vehicle provided by the invention when the vehicle is walking in the forward direction.

Fig. 5 is a schematic diagram of a first waveform of each node when the data acquisition vehicle travels in reverse.

Fig. 6 is a schematic diagram showing waveform comparison at the output end of the motion direction determining circuit unit and during forward/backward walking in unit time.

Fig. 7 is a schematic diagram of a second waveform of each node of the data acquisition vehicle provided by the invention when the vehicle is walking in the forward direction.

Fig. 8 is a schematic diagram of a second waveform of each node of the data acquisition vehicle when the vehicle travels in reverse.

Fig. 9 is a schematic circuit diagram of a second non-contact catenary parameter acquisition device according to the present invention.

Fig. 10 is a schematic circuit diagram of a non-contact catenary parameter measurement system provided by the invention.

Fig. 11 is a schematic structural diagram of a measurement software system in a non-contact type catenary parameter measurement system according to the present invention.

Fig. 12 is a schematic structural diagram of a measurement data playback software system in a non-contact catenary parameter measurement system provided by the invention.

Fig. 13 is an exemplary view of a waveform image provided by the present invention.

In the above figures: 1-a data acquisition vehicle; 2-man-machine interaction equipment.

Detailed Description

The invention is further described with reference to the drawings and specific examples. It should be noted that the description of these examples is for aiding in understanding the present invention, but is not intended to limit the present invention.

The term "and/or" is herein merely an association relationship describing an associated object, meaning that there may be three relationships, e.g., a and/or B, may represent: the terms "/and" herein describe another associative object relationship, indicating that there may be two relationships, e.g., a/and B, may indicate that: the character "/" herein generally indicates that the associated object is an "or" relationship.

Example 1

As shown in fig. 1 to 8, the first non-contact catenary parameter collection device provided in this embodiment includes a data collection vehicle, a first laser distance sensor, a first differential circuit unit, a first single-chip microcomputer processing circuit unit, a pulse encoder, a clock pulse generation circuit unit, a motion direction discriminating circuit unit, a reversible counting circuit unit, a second single-chip microcomputer processing circuit unit and an output interface circuit unit, where the number of the first laser distance sensors is two and is respectively installed at two sides of the traveling direction of the data collection vehicle, and the laser receiving and transmitting directions of the first laser distance sensors are respectively vertically upward, and the pulse encoder is installed on a traveling wheel rotating shaft of the data collection vehicle.

As shown in fig. 1, in the structure of the first non-contact catenary parameter collection device, the data collection vehicle 1 is a moving vehicle capable of walking on a track, so as to be used as a moving carrier of the other structures, and ensure that catenary parameters of the position can be automatically collected by using the other structures in the forward/backward walking process; the data acquisition vehicle 1 may be, but is not limited to, a trolley or a trolley in other forms of movement. As shown in FIG. 1, the data acquisition vehicle is preferably a T-shaped frame vehicle, which is beneficial to eliminating measurement errors caused by shaking of the vehicle body.

The switching value output end of the first laser distance sensor is electrically connected with the input end of the first differential circuit unit, and the output end of the first differential circuit unit is electrically connected with the input end of the first single chip microcomputer processing circuit unit to form a contact net strut bar recognition result data acquisition branch.

As shown in fig. 2, in the structure of the contact net strut bar identification result data acquisition branch, the first laser distance sensor is configured to detect whether a locator (which is substantially a cross bar) installed on the contact net strut bar and is used as an obstacle is located in an effective detection distance range (for example, within 5M) directly above a track by using a laser ranging technology in a running process of a data acquisition vehicle, and output a high-level switching value signal at a switching value output end when the locator is detected, otherwise, output a low-level switching value signal; which may be, but is not limited to, a medium range laser distance sensor model DX 35. The first differential circuit unit is used for converting the switching value signal from the first laser distance sensor from a rectangular wave into a sharp pulse wave so as to obtain a pulse signal representing pulse front information; which may be, but is not limited to, the use of existing differentiating circuits or the design of conventional modifications to existing differentiating circuits. The first singlechip processing circuit unit is used for performing the following identification processing on the contact network support rod according to the pulse signal by adopting the conventional program: if spike waves currently appear, judging that the current real-time contact net strut rod identification result data is used for identifying strut rods (namely representing that the contact net strut rods exist on the track road side), otherwise, judging that the current real-time contact net strut rod identification result data is not used for identifying strut rods (namely representing that the contact net strut rods are open on the track road side), thereby being convenient for further determining the strut number data of the contact net strut rods by collecting the contact net strut rod identification result data (on the premise that line data are needed and the strut number data of initial contact net strut rods are manually determined in advance, and then sequentially determining according to the sequence); it can be, but is not limited to, a single chip microcomputer chip and peripheral circuits of the model number MSP430F 123.

The phase A signal output end of the pulse encoder, the phase B signal output end of the pulse encoder and the output end of the clock pulse generation circuit unit are respectively and electrically connected with three input ends of the motion direction distinguishing circuit unit, the output end of the motion direction distinguishing circuit unit is electrically connected with the input end of the reversible counting circuit unit, and the output end of the reversible counting circuit unit is electrically connected with the input end of the second singlechip processing circuit unit to form a vehicle range data acquisition branch.

As shown in fig. 2, in the structure of the path data acquisition branch, the pulse encoder is configured to output a pair of a-phase signals and B-phase signals having a phase difference of 90 degrees when the traveling wheel spindle rotates (i.e., the data acquisition vehicle travels forward or backward), as shown in fig. 4 and 5, the a-phase signal advances by 90 degrees with respect to the B-phase signal when the data acquisition vehicle travels forward, and the B-phase signal advances by 90 degrees with respect to the a-phase signal when the data acquisition side travels backward; the pulse encoder may be, but is not limited to, a pulse encoder of model SCH 24. The clock pulse generation circuit unit is used for spontaneously generating a clock square wave signal with a certain frequency; which may be, but is not limited to, employing a clock pulse generation circuit based on a NE555 chip. The motion direction judging circuit unit is used for obtaining different output waveforms representing forward walking or reverse walking through carrying out logic operation on the A-phase signal, the B-phase signal and the clock square wave signal. The reversible counting circuit unit is used for carrying out forward counting on forward characteristic pulses in the output waveform or carrying out backward counting on backward characteristic pulses in the output waveform, and transmitting a real-time forward counting result or a real-time backward counting result to the second singlechip processing circuit unit, and can realize a forward/backward counting function by adopting the conventional reversible counter. The second single chip processing circuit unit is used for performing forward stroke calculation on the forward counting result or performing reverse stroke calculation on the reverse counting result by adopting the existing stroke algorithm to obtain real-time stroke data representing the current actual position, and the second single chip processing circuit unit can be but is not limited to a single chip and a peripheral circuit with the model number of MSP430F 123.

As shown in fig. 2, the output interface circuit unit is used for interfacing with an external data server or a computer device so as to output the collected identification result data of the contact net strut bars, real-time vehicle range data and the like in a centralized manner; which may be, but is not limited to, an RS232 interface circuit unit. Therefore, the method can be used for accurately determining the rod number and other data of the nearest contact net support rod by applying the real-time train route and the contact net support rod identification result, not only can greatly improve the detection efficiency, save time and reduce labor cost, but also can ensure timely positioning of newly discovered fault intervals, and meet the increasingly-growing railway new line acceptance and daily maintenance requirements.

The optimized speed counting circuit unit is connected with the output interface circuit unit through a first single chip microcomputer processing circuit unit; the output end of the motion direction judging circuit unit is also electrically connected with the input end of the speed counting circuit unit, and the output end of the speed counting circuit unit is electrically connected with the input end of the third singlechip processing circuit unit to form a vehicle speed data acquisition branch.

As shown in fig. 2, in the structure of the vehicle speed data acquisition branch, the speed counting circuit unit is configured to count the real-time speed of the characteristic pulse in the output waveform in a unit time, and then transmit the real-time speed counting result to the third single chip microcomputer processing circuit unit, which may, but is not limited to, implement a speed counting function by using a counter. The third single-chip microcomputer processing circuit unit is used for calculating the real-time speed of the real-time speed counting result by adopting the existing speed algorithm to obtain the actual speed data representing the current actual speed, and the third single-chip microcomputer processing circuit unit can also adopt a single-chip microcomputer chip and a peripheral circuit with the model number of MSP430F123 but is not limited to the current actual speed. Therefore, the real-time speed of the data acquisition vehicle can be obtained by additionally arranging the vehicle speed data acquisition branch.

Preferably, as shown in fig. 3, the motion direction discriminating circuit unit includes a first resistor R1, a second resistor R2, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a first nand gate U1, a second nand gate U2, a third nand gate U3, an a-phase input pin_a for electrically connecting the a-phase signal output terminal, a B-phase input pin_b for electrically connecting the B-phase signal output terminal, and a clock pulse input Time for electrically connecting the output terminal of the clock pulse generating circuit unit; the phase A input end Pin_A is electrically connected with the first end of the first resistor R1, the second end of the first resistor R1 is electrically connected with the first input end of the first NAND gate U1, and the second input end of the first NAND gate U1 is electrically connected with the clock pulse input end Time; the phase B input end Pin_B is electrically connected with the first end of the second resistor R2, the second end of the second resistor R2 is electrically connected with the first input end of the second NAND gate U2, the second output end of the second NAND gate U2 is electrically connected with the first end of a third resistor R3, and the second end of the third resistor R3 is electrically connected with direct-current voltage; the output end of the first nand gate U1 and the output end of the second nand gate U2 are respectively and electrically connected with two input ends of the third nand gate U3, and the output end of the third nand gate U3 is used as the output end Pout of the motion direction distinguishing circuit unit; the first input end of the second nand gate U2 is further electrically connected to the cathode of the first diode D1 and the anode of the second diode D2, the output end of the third nand gate U3 is further electrically connected to the cathode of the third diode D3 and the anode of the fourth diode D4, the anode of the first diode D1 and the anode of the third diode D3 are grounded, and the cathode of the second diode D2 and the cathode of the fourth diode D4 are electrically connected to the dc voltage.

As shown in fig. 3, in the specific circuit structure of the motion direction discriminating circuit unit, the dc voltage is provided by a power module, for example, a +15v dc voltage. The working principle of the motion direction distinguishing circuit unit can be shown by a first waveform signal of each node when the data acquisition vehicle walks forward/backward as shown in fig. 4-5, so that different unit waveforms as shown in fig. 6 can be obtained at the output end Pout of the motion direction distinguishing circuit unit when the data acquisition vehicle walks forward/backward, and further, the two different unit waveforms can be used for representing different walking states, namely, taking fig. 6 as an example, the digital information "11111110000011111000" of the unit waveforms can be used for representing that the data acquisition vehicle is in a forward walking state, and the digital signal "11111100001111100000" of the unit waveform can be used for representing that the data acquisition vehicle is in a forward walking state, thereby realizing a direction recognition function.

Further preferably, a direction distinguishing starting branch is further connected in series between the second end of the first resistor R1 and the first input end of the first nand gate U1, wherein the direction distinguishing starting branch comprises a fourth resistor R4, a fifth resistor R5, a fifth diode D5, a sixth diode D6, a capacitor C1, a triode Q1, a fourth nand gate U4 and a starting control input pin_sy; the second end of the first resistor R1 is electrically connected to the first input end of the fourth nand gate U4, and the start control input end pin_sy is electrically connected to the first end of the third resistor R3, the cathode of the fifth diode D5 and the second input end of the fourth nand gate U4, respectively; the output end of the fourth nand gate U4 is electrically connected to the anode of the fifth diode D5, the first end of the fourth resistor R4 and the base electrode of the triode Q1, the emitter electrode of the triode Q1 is electrically connected to the anode of the sixth diode D6, and the collector electrode of the triode Q1 is electrically connected to the first end of the fifth resistor R5 and the first input end of the first nand gate U1, respectively; the second end of the fourth resistor R4, the second end of the fifth resistor R5 and the first end of the capacitor C1 are respectively and electrically connected to the dc voltage, and the second end of the capacitor C1 and the cathode of the sixth diode D6 are respectively grounded.

In the circuit structure of the direction discriminating start-up branch, as shown in fig. 3, the start-up control input pin_sy is used for inputting a control level signal (may be from a key switch or other controller), and as shown in fig. 7 and 8, when a low level is input, the output terminal Pout of the motion direction discriminating circuit unit is always at a low level, and at this time, the start-up of the motion direction discriminating circuit unit is suspended; when a high level is input, the output terminal Pout of the motion direction discriminating circuit unit can obtain unit waveforms representing different walking states, and the motion direction discriminating circuit unit is started at this time. Therefore, the starting branch is judged according to the direction, the starting and stopping control function can be achieved on the movement direction judging circuit unit, and simulation debugging is facilitated.

Preferably, a protection circuit unit and a high-impedance level conversion circuit unit are sequentially connected in series between the output end of the pulse encoder and the input end of the motion direction distinguishing circuit unit.

As shown in fig. 2, the protection circuit unit is used for preventing damage to components in the circuit when the voltage signal is too large, so as to improve the anti-interference capability; which may be, but is not limited to, employing or conventionally retrofitting existing optocoupler isolation circuits. The high-impedance level conversion circuit unit is used for amplifying an input signal, matching the input impedance with the high-impedance level conversion circuit unit, and achieving the purposes of maximum power transmission and preventing the input signal from being consumed on the self impedance due to excessively weak input signal; which may be, but is not limited to, employing or custom retrofit with existing common collector based high impedance level shifting circuits. By the above design, the port safety and the normal input of the signal between the output end of the pulse encoder and the input end of the motion direction discriminating circuit unit can be ensured.

In summary, the non-contact type contact net parameter acquisition device provided by the embodiment has the following technical effects:

(1) The embodiment provides a novel acquisition device capable of fully automatically acquiring multiple parameters of a contact net, namely under the condition that a data acquisition vehicle is not stopped, on one hand, a contact net branch rod identification result for determining the number of the contact net branch rod can be automatically acquired by utilizing a contact net branch rod identification result data acquisition branch, on the other hand, the moving direction of the data acquisition vehicle can be identified, the real-time travel of the data acquisition vehicle can be further acquired by utilizing a travel data acquisition branch, and multiple parameters can be uniformly output through an output interface circuit unit, so that the nearest contact net branch rod number can be accurately determined together with the contact net branch rod identification result, the detection efficiency can be greatly improved, the time is saved, the labor cost is reduced, the increasing railway new line acceptance and daily maintenance requirements are met, and the newly discovered fault interval can be ensured to be positioned in time;

(2) The acquisition device also has the advantages of safety, reliability, high acquisition precision, easiness in debugging, simple circuit structure, low cost and the like, and is convenient for practical popularization and application.

Example two

As shown in fig. 9, the present embodiment is an expansion solution of the first embodiment, and the circuit structure provided by the present embodiment is different from the first embodiment in that: the system also comprises second laser distance sensors, an A/D sampling circuit unit, a digital filter circuit unit and an OR gate circuit unit, wherein the number of the second laser distance sensors is two and the second laser distance sensors are respectively arranged at two sides of the data acquisition vehicle in the traveling direction, and the laser receiving and transmitting directions of the second laser distance sensors are respectively vertically upwards; the analog output end of the second laser distance sensor is electrically connected with the input end of the A/D sampling circuit unit, the output end of the A/D sampling circuit unit is electrically connected with the input end of the digital filter circuit unit, the output end of the digital filter circuit unit and the output end of the first differential circuit unit are respectively and electrically connected with the two input ends of the OR gate circuit unit, and the output end of the OR gate circuit unit is electrically connected with the input end of the first singlechip processing circuit unit.

As shown in fig. 9, the second laser distance sensor is configured to output an analog distance signal from the position of the second laser distance sensor to the locator above the track by using a laser ranging technology during the traveling process of the data acquisition vehicle; which may be, but is not limited to, a medium range laser distance sensor model DX 35. The A/D sampling circuit unit is used for carrying out analog-to-digital sampling on the analog distance signal to obtain a digital distance signal; which may be implemented, but is not limited to, analog-to-digital sampling using existing a/D analog-to-digital converters and peripheral circuitry. The digital filter circuit unit is used for carrying out digital filtering on the digital distance signals to obtain low-noise digital distance signals; which may be implemented, but is not limited to, using an existing DSP (Digital Signal Processor ) chip and peripheral circuitry. The OR gate circuit unit is used for carrying out logical OR operation on the digital distance signal and the pulse signal so that the digital distance signal and the pulse signal can be compatibly input into the first singlechip processing circuit unit. After the digital distance signal is obtained, the first singlechip processing circuit unit can firstly obtain the real-time distance from the data acquisition vehicle to the locator above the track according to the conventional program, if the real-time distance is close to the installation parameter, the current real-time contact net support pole identification result data is judged to be the identification of the support pole (namely, the contact net support pole exists on the track side), otherwise, the current real-time contact net support pole identification result data is judged to be the identification of the non-identification support pole (namely, the contact net support pole is clear on the track side), and therefore the contact net support pole identification result data can be acquired.

Preferably, the system further comprises a manual key and a second differential circuit unit, wherein the manual key is arranged on the data acquisition vehicle; the output end of the manual key is electrically connected with the input end of the second differential circuit unit, and the output end of the second differential circuit unit is electrically connected with the third input end of the OR circuit unit. As shown in fig. 9, the manual key is used for generating a switching value signal by manual pressing when the data acquisition vehicle passes through the road side branch pole. The second differential circuit unit is used for converting the switching value signal from the manual key from rectangular wave to spike pulse wave so as to obtain a pulse signal representing the pulse front information; which may be, but is not limited to, the use of existing differentiating circuits or the design of conventional modifications to existing differentiating circuits. After the first singlechip processing circuit unit obtains the pulse signal through the OR gate circuit unit, the identification result data of the contact net strut rod can still be obtained based on the same existing conventional program in the embodiment.

The embodiment provides the technical effect of the acquisition device, and on the basis of the technical effect of the first embodiment, the acquisition device further has the following technical effects:

(1) Through arranging or gate circuit unit in this novel collection system, can be compatible obtain contact net support pole recognition result based on switching value detection mode, analog quantity detection mode and artifical manual mode etc. and satisfy different use habits, extend application scope.

Example III

As shown in fig. 10 to 13, this embodiment, as an expansion technical solution including the first embodiment or the second embodiment, provides a non-contact network parameter measurement system adopting a digital laser technology, including a data center server, a man-machine interaction device, and a non-contact network parameter collection device adopting a digital laser technology as described in the first embodiment or the second embodiment, where an input end of the data center server is electrically connected to an output interface circuit unit in the non-contact network parameter collection device, and an output end of the data center server is electrically connected to the man-machine interaction device.

The data center server is a data processing center and a data storage center of the measuring system, and is internally provided with a measuring software system comprising a contact net strut bar identification result data interface, a train course data interface, a line database, a strut bar positioning module and a strut bar number determining module; the contact net strut bar identification result data interface is used for importing contact net strut bar identification result data from the first singlechip processing circuit unit; the program data interface is used for importing program data from the second singlechip processing circuit unit; the line database is used for storing line data comprising line branch rod numbers, line names, line intervals, line branch rod numbers, a line location work area, a line location responsibility unit and the like; the strut positioning module is configured to, after receiving real-time strut identification result data of the strut identification result data interface of the overhead contact system and real-time range data from the range data interface, calculate, according to the real-time range data, a real-time moving distance from a current data acquisition vehicle position to a previous determined strut position, if the real-time moving distance is in a range of S-x to s+x, and the real-time strut identification result data indicates that a strut is currently identified, determine that the strut is an effective strut, and then determine, according to the strut number data of the previous determined strut and the line data from the line database, the strut number data of the effective strut, where the strut number data includes a line strut number corresponding to the strut and a line name, a line interval, a work area where the line belongs to and/or a responsibility unit where the line belongs to the overhead contact system, S is a design spacing of the strut, and x is an offset constant.

In the pillar rod positioning module, the design spacing S may be exemplified by 60 meters and the offset constant x may be exemplified by 2 meters. The numerical range S-x-S+x provides a time window for verifying whether the currently identified support rod is an effective support rod, so that a large number of suspected support rods misjudged in a non-time window can be eliminated, and the accuracy of automatically acquiring the support rod number of the contact net is greatly improved. In addition, the line strut number of the initial strut is manually determined by a human, for example, when the line strut number of the initial strut is determined to be 1024, and each time an effective strut is newly determined along the traveling direction of the data acquisition vehicle, the line strut number of the effective strut is self-added by 1 on the basis of the line strut number of the previously determined strut.

The man-machine interaction device is used as a man-machine interaction interface facing to staff and used for realizing the input of initial parameters and the output display of measurement result data, and can be but not limited to a notebook computer as shown in fig. 1.

Preferably, as shown in fig. 10 to 11, the non-contact catenary parameter measurement system further comprises a laser scanner, a track gauge sensor and an inclination sensor which are installed on the data acquisition vehicle, wherein a laser scanning surface of the laser scanner is positioned above the data acquisition vehicle and is perpendicular to the traveling direction of the data acquisition vehicle; and the output ends of the laser scanner, the track gauge sensor and the inclination angle sensor are respectively and electrically connected with the input end of the data center server.

As shown in fig. 10, in the structure of the non-contact network parameter measurement system, the laser scanner is configured to continuously emit laser pulses, and the built-in rotating optical mechanism emits the laser pulses at a certain angular interval (angular resolution) to each direction within a scanning angle, so as to form a two-dimensional scanning plane with radial coordinates as a reference, and finally obtain scanning data including distance and angular information to the position of the object to be measured; the laser scanner may be, but is not limited to, a laser scanning device of model number LMS511-10100 or LMS 511-20100. The track gauge sensor is used for measuring the distance between the left rail and the right rail of the rail, and can be an existing track gauge measuring sensor designed by utilizing the magnetostriction principle. The inclination sensor is used for measuring inclination angle data of the data acquisition vehicle, and is also an existing sensor.

As shown in fig. 11, the measurement software system in the data center server further includes a laser scanner interface, a track gauge sensor interface, an inclination angle sensor interface, a coordinate system module, a calibration module, a compensation module, an overrun judgment module, a data storage module and a display interface driving module; the laser scanner interface is used for importing laser scanning data from a laser scanner; the gauge sensor interface is used for importing gauge measurement data from a gauge sensor; the inclination sensor interface is used for importing inclination measurement data from an inclination sensor; the coordinate system module is used for converting the real-time scanning data from the laser scanner into rectangular coordinates from polar coordinates after receiving the real-time scanning data, classifying the real-time scanning data according to whether the real-time scanning data belong to the same obstacle, filtering interference data according to the number of continuous data points of the obstacle, and finally obtaining real-time wire pull-out values and real-time wire heights of the contact wire according to the rest real-time scanning data about the contact wire.

The calibration module is used for calculating original error data generated by machining according to the automatic measurement value and the manual measurement value when calibrating parameters; the compensation module is used for respectively correcting and compensating the real-time wire pull-out value and the real-time wire height according to the real-time gauge measurement data from the gauge sensor, the real-time dip angle measurement data from the dip angle sensor and the original error data from the calibration module; the overrun judging module is used for judging whether the real-time wire pull-out value and the real-time wire height exceed the limits, and if yes, the strut rod positioning module determines the nearest strut rod of the overhead contact system as a fault interval rod; the data storage module is used for binding and storing the rod number data determined by the support rod positioning module, the compensated real-time wire pull-out value and the compensated real-time wire height; the display interface driving module is used for driving the man-machine interaction equipment to output and display the latest real-time wire pull-out value, real-time wire height and rod number data, and/or outputting and displaying the real-time wire pull-out value, the real-time wire height and the rod number data corresponding to the fault interval rod.

The measurement method of the non-contact type catenary parameter measurement system can include the following steps.

S101, receiving real-time scanning data from a laser scanner, and converting the real-time scanning data from polar coordinates to rectangular coordinates.

S102, classifying the real-time scanning data according to whether the real-time scanning data belong to the same obstacle, filtering interference data according to the number of continuous data points of the obstacle, and finally obtaining the rest real-time scanning data which are the scanning data about the contact net wires.

In the step S102, whether the two continuous data are the same obstacle may be determined according to whether the height difference of the two continuous data is greater than 30mm, if the height difference is greater than 30mm, the two continuous data are determined to be different obstacles, and if the height difference is less than 30mm, the two continuous data are determined to be the same obstacle, so that the interference data such as the tunnel wall can be filtered.

S103, acquiring a real-time wire pull-out value and a real-time wire height of the contact wire according to the rest real-time scanning data.

S104, correcting and compensating the real-time wire pull-out value and the real-time wire height according to the real-time track gauge measurement data from the track gauge sensor, the real-time dip angle measurement data from the dip angle sensor and the original error data determined during calibration.

In the step S104, the raw error data is a raw error generated by machining calculated from the measured value of the apparatus and the actual value measured manually.

S105, determining whether the corresponding contact net wire is a contact wire or a carrier rope according to the height of the real-time wire, and if two contact wires appear, respectively calculating the real-time parallel distance and the real-time height difference between the two contact wires according to the pull-out value of the real-time wire and the height of the real-time wire of the corresponding contact wire.

In the step S105, it may also be determined whether the anchor segment is an anchor segment or a line fork according to the slopes of the two contact lines; the number of the hanging strings and the position of each hanging string are calculated according to the span and by a formula.

After step S106, the pre-stored corresponding rod number data may be found in the line database according to the line branch rod number of the fault section rod, and the rod number data and the overhead line parameters obtained by other real-time measurements including the corresponding real-time wire pull-out value, the real-time wire height, etc. may be output for warning, so as to perform timely maintenance and eliminate traffic hidden trouble.

The data storage mode of the data center server can be divided into two types of full data storage and positioning point data storage, wherein the full data (including track gauge, superelevation, side limit, pull-out value, height and the like) measured once are stored for each certain distance (for example, 5 cm) of a data acquisition vehicle, and the geometrical parameters of a strut rod, a hanger and a line fork are stored at fixed points.

As shown in fig. 12 to 13, the data center server is also internally provided with a measurement data playback software system comprising a storage read-write module, a line manager, a waveform data model, a graphic interface module, a command control module and an operation stack module;

As shown in fig. 12 and 13, the catenary parameters may be, but are not limited to, wire pullout values, wire heights, parallel spacing, or height differences, etc. Therefore, by arranging the measurement data playback software system in the novel measurement system, the application purposes of carrying out data playback, data analysis, data correction and the like on the measurement data can be realized, and the automation of the later data analysis is ensured.

The present embodiment provides the technical effects of the measurement system and the measurement method thereof, and on the basis of the technical effects of the first embodiment or the second embodiment, the present embodiment further has the following technical effects:

(1) The embodiment also provides a novel measuring system capable of fully automatically collecting multiple parameters of the overhead contact system and a measuring method thereof, which can automatically determine the rod number data of the nearest overhead contact system support rod according to the overhead contact system support rod identification result and real-time travel, and can also be combined with a laser scanner, a track gauge sensor and an inclination sensor to calculate and obtain overhead contact system parameters including the pull-out value of the overhead contact system wire, the wire height and the like, and can automatically store data, display the data and find fault positions through data overrun detection, thereby further improving the detection efficiency, saving time and reducing the labor cost;

(2) By arranging the measurement data playback software system in the novel measurement system, the application purposes of performing data playback, data analysis, data correction and the like on the measurement data can be realized, and the automation of the later data analysis is ensured.

The invention is not limited to the alternative embodiments described above, but any person may derive other various forms of products in the light of the present invention. The above detailed description should not be construed as limiting the scope of the invention, which is defined in the claims and the description may be used to interpret the claims.

Claims

1. A non-contact network parameter acquisition device adopting a digital laser technology is characterized in that: the device comprises a data acquisition vehicle, a first laser distance sensor, a first differential circuit unit, a first single-chip microcomputer processing circuit unit, a pulse encoder, a clock pulse generation circuit unit, a motion direction judging circuit unit, a reversible counting circuit unit, a second single-chip microcomputer processing circuit unit, an output interface circuit unit, a speed counting circuit unit and a third single-chip microcomputer processing circuit unit, wherein the number of the first laser distance sensors is two and is respectively arranged on two sides of the walking direction of the data acquisition vehicle, the laser receiving and transmitting directions of the first laser distance sensors are respectively and vertically upwards, the pulse encoder is arranged on a walking wheel rotating shaft of the data acquisition vehicle, and the output end of the third single-chip microcomputer processing circuit unit is electrically connected with the output interface circuit unit;

the output end of the first single-chip microcomputer processing circuit unit and the output end of the second single-chip microcomputer processing circuit unit are respectively and electrically connected with the output interface circuit unit;

the output end of the motion direction judging circuit unit is also electrically connected with the input end of the speed counting circuit unit, and the output end of the speed counting circuit unit is electrically connected with the input end of the third singlechip processing circuit unit to form a vehicle speed data acquisition branch;

The motion direction distinguishing circuit unit comprises a first resistor (R1), a second resistor (R2), a first diode (D1), a second diode (D2), a third diode (D3), a fourth diode (D4), a first NAND gate (U1), a second NAND gate (U2), a third NAND gate (U3), an A-phase input end (Pin_A) for electrically connecting the A-phase signal output end, a B-phase input end (Pin_B) for electrically connecting the B-phase signal output end and a clock pulse input end (Time) for electrically connecting the output end of the clock pulse generating circuit unit;

the phase A input end (Pin_A) is electrically connected with the first end of the first resistor (R1), the second end of the first resistor (R1) is electrically connected with the first input end of the first NAND gate (U1), and the second input end of the first NAND gate (U1) is electrically connected with the clock pulse input end (Time);

the phase B input end (Pin_B) is electrically connected with the first end of the second resistor (R2), the second end of the second resistor (R2) is electrically connected with the first input end of the second NAND gate (U2), the second output end of the second NAND gate (U2) is electrically connected with the first end of a third resistor (R3), and the second end of the third resistor (R3) is electrically connected with direct-current voltage;

the output end of the first NAND gate (U1) and the output end of the second NAND gate (U2) are respectively and electrically connected with two input ends of the third NAND gate (U3), and the output end of the third NAND gate (U3) is used as the output end (Pout) of the motion direction judging circuit unit;

The first input end of the second NAND gate (U2) is further electrically connected with the cathode of the first diode (D1) and the anode of the second diode (D2) respectively, the output end of the third NAND gate (U3) is further electrically connected with the cathode of the third diode (D3) and the anode of the fourth diode (D4) respectively, the anode of the first diode (D1) and the anode of the third diode (D3) are grounded respectively, and the cathode of the second diode (D2) and the cathode of the fourth diode (D4) are electrically connected with the direct-current voltage respectively.

2. A non-contact catenary parameter acquisition apparatus using a digital laser technique according to claim 1, wherein: the system also comprises second laser distance sensors, an A/D sampling circuit unit, a digital filter circuit unit and an OR gate circuit unit, wherein the number of the second laser distance sensors is two and the second laser distance sensors are respectively arranged at two sides of the data acquisition vehicle in the traveling direction, and the laser receiving and transmitting directions of the second laser distance sensors are respectively vertically upwards;

3. A non-contact catenary parameter acquisition apparatus using a digital laser technique according to claim 2, wherein: the system also comprises a manual key and a second differential circuit unit, wherein the manual key is arranged on the data acquisition vehicle;

4. A non-contact catenary parameter acquisition apparatus using a digital laser technique according to claim 1, wherein: a direction judging starting branch circuit is connected in series between the second end of the first resistor (R1) and the first input end of the first NAND gate (U1), wherein the direction judging starting branch circuit comprises a fourth resistor (R4), a fifth resistor (R5), a fifth diode (D5), a sixth diode (D6), a capacitor (C1), a triode (Q1), a fourth NAND gate (U4) and a starting control input end (Pin_SY);

the second end of the first resistor (R1) is electrically connected with the first input end of the fourth NAND gate (U4), and the starting control input end (Pin_SY) is electrically connected with the first end of the third resistor (R3), the cathode of the fifth diode (D5) and the second input end of the fourth NAND gate (U4) respectively;

The output end of the fourth NAND gate (U4) is electrically connected with the anode of the fifth diode (D5), the first end of the fourth resistor (R4) and the base electrode of the triode (Q1), the emitter electrode of the triode (Q1) is electrically connected with the anode of the sixth diode (D6), and the collector electrode of the triode (Q1) is respectively electrically connected with the first end of the fifth resistor (R5) and the first input end of the first NAND gate (U1);

the second end of the fourth resistor (R4), the second end of the fifth resistor (R5) and the first end of the capacitor (C1) are respectively and electrically connected with the direct-current voltage, and the second end of the capacitor (C1) and the cathode of the sixth diode (D6) are respectively grounded.

5. A non-contact network parameter measurement system adopting digital laser technology is characterized in that: the system comprises a data center server, man-machine interaction equipment and the non-contact network parameter acquisition device adopting the digital laser technology according to any one of claims 1-4, wherein the input end of the data center server is electrically connected with an output interface circuit unit in the non-contact network parameter acquisition device, and the output end of the data center server is electrically connected with the man-machine interaction equipment;

6. A system for measuring parameters of a contact network using digital laser technology as defined in claim 5, wherein: the system also comprises a laser scanner, a track gauge sensor and an inclination sensor which are arranged on the data acquisition vehicle, wherein a laser scanning surface of the laser scanner is positioned above the data acquisition vehicle and is vertical to the travelling direction of the data acquisition vehicle;

7. A system for measuring parameters of a contact network using digital laser technology as defined in claim 6, wherein: the data center server is also internally provided with a measurement data playback software system comprising a storage read-write module, a line manager, a waveform data model, a graphic interface module, a command control module and an operation stack module;

8. A method for measuring a parameter of a contact network using a digital laser technique according to claim 6, comprising the steps of: