CN111823956A - General detection method for eccentric wear of rail transit contact net lead - Google Patents
General detection method for eccentric wear of rail transit contact net lead Download PDFInfo
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- CN111823956A CN111823956A CN202010753192.9A CN202010753192A CN111823956A CN 111823956 A CN111823956 A CN 111823956A CN 202010753192 A CN202010753192 A CN 202010753192A CN 111823956 A CN111823956 A CN 111823956A
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- 238000001514 detection method Methods 0.000 title claims abstract description 36
- 238000006073 displacement reaction Methods 0.000 claims abstract description 36
- 238000000034 method Methods 0.000 claims abstract description 20
- 230000005540 biological transmission Effects 0.000 claims abstract description 19
- 230000003137 locomotive effect Effects 0.000 claims abstract description 16
- 230000008054 signal transmission Effects 0.000 claims abstract description 13
- 239000000523 sample Substances 0.000 claims description 37
- 238000005259 measurement Methods 0.000 claims description 9
- 239000004020 conductor Substances 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 230000014759 maintenance of location Effects 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000013519 translation Methods 0.000 description 8
- 230000009471 action Effects 0.000 description 7
- 238000005299 abrasion Methods 0.000 description 5
- 230000033001 locomotion Effects 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000003860 storage Methods 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
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- 239000008358 core component Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
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- 230000010355 oscillation Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M1/00—Power supply lines for contact with collector on vehicle
- B60M1/12—Trolley lines; Accessories therefor
- B60M1/28—Manufacturing or repairing trolley lines
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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Abstract
The invention discloses a general detection method for rail transit contact line wire eccentric wear, which is implemented by operating an electric and pneumatic control operation system by using a hardware part consisting of a digital linear displacement sensor measuring head with an Internet of things Zigbee short-distance wireless transmission module, a pneumatic valve island and a PLC (programmable logic controller) program electric control assembly, and is high-altitude detection complete equipment integrating mechanical, electric, pneumatic and wireless signal transmission comprehensive technical methods. The detection method is suitable for overhead high-voltage transmission contact lines of electrified high-speed railways and overhead medium-voltage transmission contact lines of urban rail transit and electric locomotives, and is used for randomly detecting the eccentric wear value before the use critical point caused by the relative friction between the contact line and a locomotive pantograph when the locomotive runs in an online electrified manner, so that the detection method is convenient for maintenance of engineering personnel, prevents serious line breakage accidents, and is an important measure for intelligent operation and maintenance in the rail transit industry.
Description
Technical Field
The invention relates to a general detection method for rail transit contact line lead eccentric wear, which creatively uses a hardware part consisting of a digital linear displacement sensor measuring head with an Internet of things Zigbee short-distance wireless transmission module, a pneumatic valve island and a PLC program electric control assembly, and is completed by operating an electric and pneumatic control operation system arranged on a portable computer, and the general detection method is a high-altitude lead detection method integrating mechanical, electric, pneumatic and wireless signal transmission comprehensive technical methods. The method is applied to detection of overhead high-voltage transmission contact lines (27.5 kilovolt alternating current) of electrified high-speed railways and overhead medium-voltage transmission contact lines (commonly 0.75 kilovolt and 1.5 kilovolt direct current) of urban rail transit and electric locomotives, and the eccentric wear value before a use critical point generated by the relative friction between the contact lines and a locomotive pantograph when the locomotive runs is detected randomly in an online electrified manner, so that the potential danger of serious disconnection of the contact line is eliminated, and the normal running of the rail transit is protected.
Background
When a locomotive of rail transit runs, dry friction relative motion of 60-100 m/s is generated between a pantograph and a power transmission contact line, and eccentric wear loss is generated naturally. When the eccentric wear is gradually increased, the resistance, current density, temperature rise and electric power of the wire are increased, thereby causing the eccentric wear loss to be further increased to form a vicious circle. The timely detection and processing in operation and maintenance can avoid serious accidents of power transmission contact line disconnection, thereby avoiding serious accidents when a locomotive runs.
At the present stage, the traditional method of power failure, parking, aerial ladder rising and manual vernier caliper measurement for decades is still applied to the measurement of contact line eccentric wear in China, and the old traditional diameter measurement method is large in workload and poor in high-altitude detection accuracy. Particularly, the eccentric wear of the contact line on the bend is difficult to be accurately measured based on the semicircle on the contact line and the line clamping groove, but the precision and the reliability of a non-contact laser scanning measuring instrument and a CCD camera image acquisition measuring instrument which are researched and developed by a large amount of manpower and material resources are far less than those of a traditional manual diameter measuring method in the world around the developed countries of the global electrified railway technology for half a century, so that the high-speed railway traction power supply department in China still uses the manual caliper diameter method to measure the eccentric wear of the contact line.
The speed per hour of the electrified railway locomotive in China is over 300 kilometers, the operation rate is increased year by year, the running density of the locomotive is higher and higher, and the time for power failure detection of a contact line, which can be reserved for a power supply department, is shorter and shorter. The contradiction between contact line operation and inspection and repair is more and more prominent.
Disclosure of Invention
The invention aims to solve the problems in the prior art, creatively combines the comprehensive technologies of precision machinery manufacturing, Zigbee wireless transmission of the Internet of things, a pneumatic valve island, a PLC program electric control system and Bluetooth, and realizes the minimum value and the direction detection of the residual height of a contact line through a series of software and hardware operations.
In order to solve the technical problems, the invention adopts the following scheme:
in the technical scheme, further, the rail transit overhead line system wire eccentric wear general detection method is completed by operating an electric and pneumatic control operation system arranged on a portable computer by using a hardware part consisting of a digital linear displacement sensor measuring head with an internet of things Zigbee short-distance wireless transmission module, a pneumatic valve island and a PLC program electric control assembly, and is a complete set of high-altitude detection equipment integrating mechanical, electric, pneumatic and wireless signal transmission comprehensive technical methods.
In the technical scheme, the method for detecting the contact line conductor commonly used for the rail transit comprises the detection of an overhead high-voltage transmission contact line (27.5 kilovolt alternating current) of an electrified high-speed railway and overhead medium-voltage transmission contact lines (commonly used 0.75 kilovolt and 1.5 kilovolt direct current) of urban rail transit and an electric locomotive, and the online electrified random detection of the eccentric wear value of the contact lines before the use critical point caused by the relative friction between the contact lines and a locomotive pantograph when the locomotive runs.
In the technical scheme, the rail transit contact net lead eccentric wear universal detection method is characterized in that the digital linear displacement sensor with the internet of things Zigbee short-distance wireless transmission module on the measuring head is in signal connection with the wireless signal transmission system, and the wireless signal transmission system has the main functions of: the digital linear displacement sensor working at the 2.4GHz wireless frequency band is used for wirelessly transmitting data measured at high altitude, so that ground reception is realized, a Bluetooth module portable computer working at the 2.4GHz wireless frequency band is adopted to display, record and count detected contact wear data, the minimum retention height and the direction of the contact wire to be detected are obtained, the partial wear complete appearance can be displayed, the partial wear complete appearance can be stored in the computer in a certain format, and a measured contact wire wear report can be directly printed.
In the technical scheme, the general detection method for the eccentric wear of the rail transit contact line conductor, particularly the main operation process of the pneumatic valve island, is as follows: and (3) starting the Program Logic Controller (PLC) to work, outputting an instruction according to the arranged program, and enabling the miniature electromagnetic directional valves to work in sequence according to the requirement of measurement work, so that the positioning miniature cylinder 5, the rotating cylinder 6 and the miniature probe cylinder 9 of the high-altitude suspended miniature pneumatic measuring head sequentially execute work.
In the technical scheme, the rail transit contact net lead eccentric wear universal detection method is characterized in that the method is basically suitable for all round contact leads with triangular grooves on two sides, and the specific types of the method are as follows, China railway ministry standard TB/2810-2821-1997, CTHA series round grooved contact lines with the codes CTHA-85, 100, 120 and 150; european standard EN50149, AC series round grooved contact line, code number AC-80, 100, 107, 120, 150; the German standard is similar to the European standard, and comprises DN43138 standard with code numbers of Ri-80, 100, 107, 120 and 150; there are also round grooved contact wires having cross-sectional areas of 161m m2 and 170m m2 used internationally, and the method is applicable to the round grooved contact wires in use both domestically and abroad. .
The invention has the following beneficial effects:
compared with the domestic and foreign similar methods, the method has no discreteness of measurement data, has strict requirements on measurement environments (climate, illuminance and the like), and is not influenced by contact line oscillation and winding degree; the aerial ladder can be randomly detected at any part on the ground and can also be detected on an aerial ladder of a machine maintenance vehicle; the eccentric wear is detected on a curve, as on a straight road.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 is a partial front view of a pneumatic measuring head in the contact wire detection apparatus of the present patent;
FIG. 2 is a schematic left side view of FIG. 1, in partial cross-section of the measuring head in the direction B-B of FIG. 1;
FIG. 3 is a partial schematic view of section C-C of FIG. 1;
FIG. 4 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 5 is a cross-sectional view taken along line D-D of FIG. 2;
fig. 6 is a control schematic diagram of a pneumatic valve island in the detection device of the present patent.
Detailed description of the invention
With reference to fig. 1 to 6, the general rail transit catenary wire eccentric wear detection method is implemented as follows:
the miniature pneumatic measuring head comprises a shell 1, wherein a positioning miniature cylinder 5 is arranged on the left side of the shell and is fixedly connected with an instrument shell 1; two bilaterally symmetrical translation jaw pairs 13 are arranged below the positioning micro cylinder, and the translation jaw pairs 13 are fixedly connected with a piston of the positioning micro cylinder 5; under the action of the piston of the positioning micro cylinder 5, the translation jaw pair 13 can translate in equal quantity towards the central plane Y-Y' to clamp the triangular assembly groove of the contact line 14 to be measured to be used as a measurement positioning and reference; and vice versa, to move outwards, away from the contact wire 14 to be tested.
In the middle of the housing 1 there is a circular arc shaped cavity 15, the cross section of the circular arc shaped cavity 15 being about 3/4 circular. The cylindrical rotating body 2 is sleeved in the arc-shaped cavity 15, and the rotating body 2 is in precise rotating fit with the arc-shaped cavity 15.
A rotary cylinder 6 is arranged on the right side of the instrument shell 1, and a rack 16 is arranged on a piston 3 in the rotary cylinder 6; an external gear 17 is arranged on the outer circle of the rotating body 2, and the rack 16 is meshed with the external gear 17; the following movements are thus achieved: when compressed air enters the upper cavity of the rotary air cylinder 6, the piston 3 moves downwards, and the rotary body 2 is driven to rotate 110 degrees in the anticlockwise direction by the meshed gear pair. Set up reset spring 4 between the portion of piston 3 and rotating cylinder 6, specifically be: the inner cavity of the piston 3 is provided with a return spring 4, and the upper end and the lower end of the return spring 4 respectively abut against the bottom of the piston 3 and the bottom of the rotating cylinder 6. The return spring 4 is compressed when the piston 3 runs downward; when the upper cavity of the rotary cylinder 6 is exhausted, the piston 3 is reset and ascends to the original position by means of the stored energy of the reset spring 4. Therefore, the rotating body 2 is forced to reset clockwise by 110 degrees through the meshed external gear 17 and the rack 16, the rotating plate 8 is fixedly arranged on the excircle of the left end of the rotating body 2, the digital linear displacement sensor 11 is arranged on the front surface of the rotating plate 8, the head part of the digital linear displacement sensor 11 is provided with a ball-shaped probe 111, and the tail part of the digital linear displacement sensor 11 is provided with a manual control rod 112. The back of the rotating plate 8 is provided with a miniature probe cylinder 9, a piston rod of the miniature probe cylinder 9 is provided with an elastic shifting fork 10, the other end of the elastic shifting fork 10 is connected with a manual control rod 112 of the digital linear displacement sensor 11, namely, two ends of the elastic shifting fork 10 are respectively flexibly connected with the digital linear displacement sensor 11 and the miniature probe cylinder 9. And a return spring is arranged between the piston of the miniature probe cylinder 9 and the top of the miniature probe cylinder 9. The function of the miniature probe cylinder 9 is as follows: when the piston rod of the micro probe cylinder 9 extends out, the ball-shaped probe 111 on the digital linear displacement sensor 11 is pulled out from the central point (the origin of the rectangular coordinate, namely the central point 141 of the cross section of the contact line 14 to be measured) through the elastic shifting fork 10, the manual control rod 112 on the digital linear displacement sensor 11, so as to leave a space, and thus the whole micro pneumatic measuring head is hung on the contact line 14 to be measured. After the micro probe cylinder 9 is hung, the piston rod of the micro probe cylinder 9 retracts (resets), so that the ball-shaped probe 111 of the digital linear displacement sensor 11 is slightly leaned on the outer diameter of the contact wire 14 to be detected, and the technical preparation work before detection is finished. The resolution of the digital linear displacement sensor 11 should be 0.01 mm.
The miniature pneumatic measuring probe assembly also comprises an arch-shaped movable guide pair 12 and an arch-shaped guide plate 7, wherein the center lines of the arch-shaped movable guide pair and the arch-shaped guide plate are coincident; the method specifically comprises the following steps: an arch-shaped movable guide pair 12 formed by 2 bilaterally symmetrical movable guide plates is arranged at the left end of an instrument shell 1 (as shown in a front view of figure 1, namely the front end of a micro pneumatic measuring probe assembly), the arch-shaped movable guide pair 12 is correspondingly fixed at the front end of a translation jaw pair 13, and the arch-shaped movable guide pair 12 expands a guide space along with the outward movement of the translation jaw pair 13, so that the space is large when the micro pneumatic measuring probe assembly is hung on a net, and a contact wire 14 to be measured can be easily led in; when the flat jaw pair 13 runs inwards, the excess space is reduced, so that the micro pneumatic measuring probe assembly approaches to the correct position to complete approximate positioning, and the flat jaw pair 13 can conveniently and correctly clamp the triangular mounting groove of the contact wire 14 to be measured, thereby completing correct positioning work. An arched guide plate 7 is arranged at the right end of the instrument shell 1 (as shown in figure 1 as a front view, namely the rear end of the micro pneumatic measurement probe assembly), and the arched guide plate 7 is fixedly connected with the instrument shell 1; the arched guide plate 7 plays a positioning role, and the function of the arched guide plate is similar to that of the arched movable guide pair 12.
Under the combined action of the arch-shaped movable guide pair 12 and the arch-shaped guide plate 7, the micro pneumatic measuring probe assembly is placed on the dome of the contact line 14 to be measured during line hanging, so that the axial central line of the rotating body 2 is close to the axial central line of the contact line 14 to be measured, and the functions of guiding, supporting, roughly aiming and positioning are achieved.
Secondly, a pneumatic control valve island system:
as shown in fig. 6, it comprises an air source 200, a hand-pulling valve 201, an air processing unit 202, four micro electromagnetic directional valves (i.e. micro electromagnetic directional valve 203, micro electromagnetic directional valve 204, micro electromagnetic directional valve 205, micro electromagnetic directional valve 206), five one-way throttle valves (i.e. one-way throttle valve 207, one-way throttle valve 208, one-way throttle valve 209, one-way throttle valve 210, and one-way throttle valve 211).
The gas source 200 is connected with the gas processing unit 202 through the hand-pulling valve 201.
The air supply 200 provides air supply for the whole pneumatic control valve island system.
The hand-pulled valve 201 is used as an air inlet switch of the whole portable miniature air control system, and controls air inlet or air outlet of the system.
The air treatment unit 202 filters, purifies and removes moisture from the air; providing constant air pressure and air pressure display of the system, wherein the air pressure is continuously adjustable within the range of 0.2-1 MPa; lubricating oil is mixed into the air, so that all pneumatic elements in the pneumatic system are lubricated when the pneumatic system works.
The micro electromagnetic directional valve 203 is used for controlling the extension or resetting of a piston rod of the micro probe cylinder 9; accordingly, the ball-shaped probe 111 of the digital linear displacement sensor 11 is moved away from the contact line 14 to be measured or moved up to the contact line 14 to be measured.
The micro electromagnetic directional valve 204 controls the translational jaw pair 13 of the positioning micro cylinder 5 to be tightened and loosened, and accordingly the translational jaw pair 13 clamps or loosens the triangular assembling groove of the contact line 14 to be tested.
When the micro electromagnetic directional valve 205 is in failure in positioning the micro cylinder 5, and therefore the translation jaw pair 13 on the micro cylinder (positioning micro cylinder 5) cannot be loosened from the triangular groove of the contact line 14 to be tested, the micro electromagnetic directional valve 205 is connected with the gas source 200, and the positioning jaw 13 on the positioning micro cylinder 5 is forcibly opened in an emergency.
The micro electromagnetic directional valve 206 controls the rotary cylinder 6 to move the piston 3 with the rack 16 downward or reset upward, and the rotary body 2 generates a 110 ° range rotary motion (as shown in fig. 2) by means of the mutual engagement of the rack 16 and the external gear 17, so as to drive the rotary plate 8 and the ball-shaped probe 111 of the digital linear displacement sensor 11 on the rotary plate 8 to lean against the lower semicircle of the contact 14 to be detected, and perform detection or reset within a 110 ° range.
The air source 200 is a portable high-pressure small-capacity air storage tank, and the technical data of the portable high-pressure small-capacity air storage tank are as follows: the pressure used was 2MPa, the volume 1.5 l.
Third, PLC electrical system
The PLC system comprises a portable 24V direct current battery power supply, a program logic controller, a control switch, a control button and the like. The program logic controller as the core component has six-gate input and four-gate output. The micro electric directional valve 203, the micro electromagnetic directional valve 204, the micro electromagnetic directional valve 205 and the micro electromagnetic directional valve 206 are respectively connected with a program logic controller in the PLC electric control system through signals.
The PLC electric control system controls the micro electromagnetic directional valve 203, the micro electromagnetic directional valve 204, the micro electromagnetic directional valve 205 and the micro electromagnetic directional valve 206, so that the micro probe cylinder 9, the positioning micro cylinder 5 and the rotating cylinder 6 can make the actions required by detection according to the design program and rhythm.
Four, Zigbee wireless signal transmission system
In the wireless signal transmission system, a digital linear displacement sensor 11 is in signal connection with the wireless signal transmission system.
The rail transit contact net lead eccentric wear universal detection method is implemented as follows: the main functions of the wireless signal transmission system are: and the data measured at high altitude by the digital linear displacement sensor 11 is wirelessly transmitted, so that the Bluetooth of the ground portable computer is received and correspondingly processed.
The wireless signal transmission system comprises a Zigbee technology wireless transmission module, information is wirelessly transmitted within the radius range of 12M, a 2.4GHz wireless frequency band is adopted, the data detected by the digital linear displacement sensor 11 passes through the Zigbee technology wireless transmission module to transmit the information to the ground, special software is designed by a portable computer with a Bluetooth module with the 2.4GHz frequency band, the detected contact abrasion data is displayed, recorded and counted, the minimum remaining height and the direction of a contact wire 14 to be detected are obtained, the eccentric wear overall appearance is displayed, the minimum remaining height and the direction are stored in the computer in a certain format, and a measured eccentric wear report can be directly printed.
The rail transit contact net lead eccentric wear universal detection method is implemented as follows:
1. after the power is switched on, the miniature electromagnetic directional valve 203 is powered on and opened, compressed air in the air source 200 is processed by the air processing unit 202 and then enters the lower cavity of the miniature probe cylinder 9 through the one-way throttle valve 207, so that a piston rod of the miniature probe cylinder 9 moves outwards, and the elastic shifting fork 10 on the piston rod pulls the ball-shaped probe 111 on the digital linear displacement sensor 11 to leave the origin of a rectangular coordinate. The digital linear displacement sensor 11 displays the screen from 0 → 10, and also displays the same on the screen of the notebook computer, and the origin of the rectangular coordinate is the central point 141 of the cross section of the contact line 14 to be measured.
2. The whole miniature pneumatic measuring head is supported by an insulating rod to hang the measured section of the contact wire 14 to be measured, and at the moment, the arch-shaped movable guide pair 12 and the arch-shaped guide plate 7 are placed on the contact wire 14 to be measured in tandem: in this case, the axial center line of the rotating body 2 (i.e. the perpendicular orthogonal line 0-0' between the transverse center plane X-X ' and the longitudinal center plane Y-Y ' of the rotating body 2) exactly corresponds to the axial center line of the measured section of the contact line 14 to be measured, and automatic approximate alignment (i.e. coarse alignment) is performed.
3. And pressing a work 'start' button of the PLC electric control system to start work, outputting an instruction according to a programmed program, and enabling the miniature electromagnetic directional valves to work in sequence according to the requirement of measurement work. So that the positioning micro cylinder 5, the rotating cylinder 6 and the micro probe cylinder 9 on the high-altitude suspended micro pneumatic measuring head sequentially execute work. The specific process is as follows:
firstly, compressed air from an air source 200 (a portable air storage tank is selected) passes through an opened hand-pulling valve 201 and then passes through an air processing unit 202, so that the compressed air is purified, dehumidified, stabilized and filled with lubricating oil. At this time, the micro electromagnetic directional valve 204 works after being electrified, the positioning micro cylinder 5 acts through the speed regulation of the one-way throttle valve 208, and the translation jaw pair 13 on the positioning micro cylinder 5 translates inwards, so that semicircular bilaterally-symmetrical triangular mounting grooves on the contact line 14 to be tested are clamped. The jaws are positioned so that the axial centerline of the contact line 14 to be measured is coincident with the axial centerline of the rotating body 2 (i.e., coincident with the orthogonal centerlines 0-0' of the transverse center plane X-X ' and the longitudinal center plane Y-Y ' of the rotating body 2). The zero position of the ball-shaped probe 111 on the digital linear displacement sensor 11 mounted on the rotating plate 8 is also the central point 141 of the cross section of the contact line 14 to be measured. Thus, the triangular mounting groove of the contact wire 14 to be measured is clamped as a reference for measuring and calculating the abrasion of the contact wire 14 to be measured.
And secondly, the micro electromagnetic directional valve 203 is powered off, under the action of the reset spring 4, the piston rod of the micro probe cylinder 9 returns, and the ball-shaped probe 111 on the digital linear displacement sensor 11 slightly leans against the outer diameter of the lower semicircle of the contact line 14 to be detected through the elastic shifting fork 10, so that the radius value of the contact line 14 to be detected is given.
Thirdly, the micro electromagnetic directional valve 206 is electrified, compressed air enters the upper cavity of the rotary cylinder 6 through the speed regulation of the one-way throttle valve 210, the piston 3 in the rotary cylinder 6 moves downwards, and the rack 16 on the piston 3 drives the rotating body 2 to rotate anticlockwise through the external gear 17 meshed with the piston. The rotating body 2 drives the rotating plate 8 arranged on the rotating body and the ball-shaped probe 111 on the digital linear displacement sensor 11 leaning against the outer diameter of the contact line 14 to be tested to rotate anticlockwise within the range of 110 degrees (55 degrees in a fourth quadrant and 55 degrees in a third quadrant); the ball-shaped probe 111 on the digital linear displacement sensor 11 is always attached to the outer diameter of the lower semicircle of the contact line 14 to be measured in rotation (depending on the combined action of the reset spring of the digital linear displacement sensor 11 and the reset spring of the miniature probe cylinder 9), and according to the abrasion condition of the contact line 14 to be measured, the ball-shaped probe 111 on the digital linear displacement sensor 11 correspondingly extends or contracts in the movement of close-fitting rotation, so that the abrasion curve and the abrasion appearance of the contact line 14 to be measured in the range of 110 degrees of the lower semicircle are measured.
And fourthly, the micro electromagnetic directional valve 203 is electrified, the piston rod of the micro probe cylinder 9 extends out, the ball-shaped probe 111 on the digital linear displacement sensor 11 is separated from the contact with the outer diameter of the contact wire 14 to be detected through the elastic shifting fork 10, a space is reserved, the digital linear displacement sensor 11 returns to perform earlier work, and at the moment, the maximum value of the dimension is required to be displayed by 10 millimeters simultaneously on the screen of the digital linear displacement sensor 11 and the screen of the notebook computer.
And fifthly, the micro electromagnetic directional valve 206 is powered off, and the piston 3 in the rotary cylinder 6 is forced to move upwards to reset under the action of the reset spring 4. Since the rack 16 of the piston 3 is engaged with the external gear 17 of the outer diameter of the rotating body 2, the digital linear displacement sensor 11, which is the rotating body 2, the rotating plate 8, is driven to rotate by 110 ° in the clockwise direction, and the digital linear displacement sensor 11 is reset to the original position. At the same time of the upward return of the piston 3, the compressed air in the upper chamber of the swirl cylinder 6 must be discharged, at which time the compressed air is throttled by the one-way throttle valve 211, controlling the return speed of the digital linear displacement sensor 11, and then the compressed air is discharged from the exhaust port of the micro electromagnetic directional valve 206.
Finally, the micro electromagnetic directional valve 204 is powered off, the micro positioning cylinder 5 is forced to reset under the action of the return spring of the micro positioning cylinder, so that the translation jaw pair 13 on the micro positioning cylinder is translated outwards, and is separated from the upper semicircular triangular mounting groove of the contact wire 14 to be detected, a space is reserved, and at the moment, the primary detection program of the micro pneumatic measuring head is finished.
The above is only one specific embodiment of the invention. The present invention is not limited to the above embodiments, and many variations are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the present invention are to be considered within the scope of the invention.
Claims (4)
1. A rail transit contact network lead eccentric wear general detection method is implemented by a hardware part consisting of a digital linear displacement sensor measuring head with an Internet of things Zigbee short-distance wireless transmission module, a pneumatic valve island and a PLC (programmable logic controller) program electric control assembly through operating an electric and pneumatic control operation system arranged in a portable computer, and is a high-altitude detection complete equipment integrating mechanical, electric, pneumatic and wireless signal transmission; the detection method is generally applied to contact network wires of rail transit, and comprises the detection of overhead high-voltage transmission contact wires (27.5 kilovolt alternating current) of electrified high-speed railways and overhead medium-voltage transmission contact wires (commonly 0.75 kilovolt and 1.5 kilovolt direct current) of urban rail transit and electric locomotives, and the eccentric wear value before the use critical point generated by the relative friction between the contact wires and a locomotive pantograph when the locomotive runs is randomly detected in an online electrified manner.
2. The general rail transit catenary wire eccentric wear detection method according to claim 1, wherein the digital linear displacement sensor with the internet-of-things Zigbee short-distance wireless transmission module on the measuring head is connected with a wireless signal transmission system through signals, and the wireless signal transmission system has the main functions of: the method is characterized in that data measured at high altitude by using a digital linear displacement sensor working at a 2.4GHz wireless frequency band are wirelessly transmitted, so that ground reception is realized, a Bluetooth module portable computer working at the 2.4GHz wireless frequency band is adopted to display, record and count detected contact wear data, the minimum retention height and the direction of a contact wire to be detected are obtained, the partial wear complete appearance is displayed, the contact wire to be detected is stored in the computer in a certain format, and a measured contact wire wear report can be directly printed.
3. The general rail transit overhead line system conductor eccentric wear detection method according to claim 1, characterized in that, the main operation process of especially the pneumatic valve island is as follows: and (3) starting the Program Logic Controller (PLC) to work, outputting an instruction according to the arranged program, and enabling the miniature electromagnetic directional valves to work in sequence according to the requirement of measurement work, so that the positioning miniature cylinder 5, the rotating cylinder 6 and the miniature probe cylinder 9 of the high-altitude suspended miniature pneumatic measuring head sequentially execute work.
4. The rail transit contact line wire eccentric wear universal detection method is characterized in that the method is basically suitable for all round contact wires with triangular grooves on two sides, and the specific types of the method are as follows, China railway ministry standard TB/2810-2821-1997, CTHA series round grooved contact wires with the codes of CTHA-85, 100, 120 and 150; european standard EN50149, AC series round grooved contact line, code number AC-80, 100, 107, 120, 150; the German standard is similar to the European standard, and comprises DN43138 standard with code numbers of Ri-80, 100, 107, 120 and 150; the cross-sectional area of 161m m is used internationally2And 170m m2The circular grooved contact line of (2) is applicable to both domestic and foreign circular grooved contact lines.
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| CN202010753192.9A CN111823956A (en) | 2020-07-30 | 2020-07-30 | General detection method for eccentric wear of rail transit contact net lead |
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Citations (7)
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| CN109664797A (en) * | 2019-02-27 | 2019-04-23 | 襄阳国铁机电股份有限公司 | Rail net detection system and detection vehicle |
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