CN112394260A - Adjustable bow net arcing fixed point on-line detection device - Google Patents
Adjustable bow net arcing fixed point on-line detection device Download PDFInfo
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- CN112394260A CN112394260A CN201910739035.XA CN201910739035A CN112394260A CN 112394260 A CN112394260 A CN 112394260A CN 201910739035 A CN201910739035 A CN 201910739035A CN 112394260 A CN112394260 A CN 112394260A
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- arcing
- detection device
- sensor
- supporting column
- bow net
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1218—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using optical methods; using charged particle, e.g. electron, beams or X-rays
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V20/00—Scenes; Scene-specific elements
- G06V20/50—Context or environment of the image
- G06V20/52—Surveillance or monitoring of activities, e.g. for recognising suspicious objects
- G06V20/54—Surveillance or monitoring of activities, e.g. for recognising suspicious objects of traffic, e.g. cars on the road, trains or boats
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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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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V20/00—Scenes; Scene-specific elements
- G06V20/60—Type of objects
- G06V20/62—Text, e.g. of license plates, overlay texts or captions on TV images
- G06V20/625—License plates
Abstract
The invention discloses an adjustable bow net arcing fixed point online detection device which comprises an installation mechanism, an adjustment mechanism, a detection mechanism and a wireless signal module, wherein the installation mechanism consists of a fixed base, a supporting plate and a supporting column, the upper end surface of the fixed base is in sliding connection with a sliding block arranged at the lower end of the supporting plate through a groove, the upper end of the fixed base is in threaded connection with a plurality of positioning bolts through bolt holes, and the lower end of the supporting column is fixedly arranged on the upper end surface of the supporting plate. The invention has simple structure, convenient operation and reasonable design, uploads the over-standard arcing image information, character report information and corresponding vehicle information in real time, can carry out fixed-point real-time online detection on weak pantograph-catenary current-receiving points such as a section insulator, an anchor section joint, rigid-flexible transition, turnouts and the like, can continuously detect with high precision by mastering the operation state of equipment in real time by a later operation unit, and has high measurement efficiency due to the fusion of data and image data.
Description
Technical Field
The invention relates to the technical field of safety detection equipment, in particular to an adjustable bow net arcing fixed point online detection device.
Background
With the rapid development of science and technology in China, the transportation industry in China is also rapidly developed, various kinds of transportation are more and more convenient to use, and corresponding data of automobiles, trains and high-speed rail lamp transportation tools need to be detected in real time in the running process.
The conventional device has the following disadvantages:
1. the existing detection device can only carry out single shooting record through a camera and then transmit corresponding information to a server for processing, continuous high-precision measurement cannot be carried out, the measurement efficiency is low, and the vehicle running state information is less mastered;
2. meanwhile, the requirements are different on different road sections or different vehicles to be detected, and the detection range of the detection device cannot be effectively adjusted according to the height of the vehicle body;
3. the data are detected and analyzed in real time by background operators, and the operation is complex.
Disclosure of Invention
The invention aims to provide an adjustable bow net arcing fixed point online detection device, which solves the problems that the existing detection device provided in the background technology can only carry out single shooting record through a camera and then transmit corresponding information to a server for processing, the measurement efficiency cannot be continuously measured with high precision, and the information of the running state of a vehicle is less mastered.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a bow net arcing fixed point on-line measuring device with adjustable, includes installation mechanism, adjustment mechanism, detection mechanism and wireless signal module, installation mechanism comprises unable adjustment base, backup pad and support column, slider sliding connection through seting up recess and backup pad lower extreme setting on unable adjustment base's the up end, there are a plurality of pilot pin in unable adjustment base's the upper end through seting up bolt hole threaded connection, the lower extreme of support column is fixed to be set up on the up end of backup pad, the fixed installation pole that is provided with in upper end of support column, solar cell panel is installed to the upper end of installation pole, adjustment mechanism installs on installation mechanism, detection mechanism installs respectively on installation mechanism and adjustment mechanism, wireless signal module installs on detection mechanism.
Preferably, adjustment mechanism comprises fixed plate, lead screw, first ball nut and a plurality of second ball nut, the fixed plate is fixed to be set up on the side of support column upper end one side, the upper and lower end of lead screw is movable respectively and is set up on the fixed plate and the backup pad, threaded connection between lead screw and first ball nut and the second ball nut, install the connecting plate on first ball nut's the up end, overlap on the lead screw through seting up the round hole on the connecting plate, one side that the connecting plate is close to the support column is provided with the go-between, the go-between cover is established on the surface of support column, one side that second ball nut is close to the support column is provided with the snap ring, the snap ring cover sets up on the surface of support column.
Preferably, the detection mechanism comprises a control cabinet, a vehicle shooting camera, an arc burning recording camera, a first arc burning sensor and a second arc burning sensor, the control cabinet is arranged on the side surface of the clamp ring far away from one side of the first ball nut, the output end of the solar cell panel is electrically connected with the input end of the control cabinet, a vehicle passing detection module, an arc burning signal processor and an information recording and processing machine are arranged in the control cabinet, the vehicle passing detection module is respectively connected with the vehicle shooting camera, the arc burning recording camera, the first arc burning sensor and the second arc burning sensor in a control mode, the vehicle shooting camera is arranged on the side, far away from the first ball nut, of the connecting ring, the output end of the vehicle shooting camera is electrically connected with the input end of the information recording and processing machine, and the arc burning recording camera, the first arc burning sensor and the second arc burning sensor are all arranged at the upper end of the support pillar, the output ends of the arcing recorder, the first arcing sensor and the second arcing sensor are electrically connected with the input end of the arcing signal processor, and the output end of the arcing signal processor is electrically connected with the input end of the information recording and processing machine.
Preferably, the wireless signal module includes WIFE module and 4G module, WIFE module and 4G module all set up inside the switch board, the output and the wireless signal module electric connection of information record and processor, wireless signal module's output end signal connection has cloud terminal and PC monitor terminal.
Preferably, a plurality of fixing holes are formed in the four sides of the supporting plate on the fixing base.
Preferably, the inside of support column is installed the heat conduction post through seting up the cavity, be provided with a plurality of heat conduction piece on the lateral surface of heat conduction post, the other end and the inside wall of support column of heat conduction piece are connected.
Preferably, a reinforcing rod is arranged on the lower end face of the solar cell panel, and the lower end of the reinforcing rod is arranged on the upper end face of the fixing plate.
Preferably, the upper end of the connecting plate on the screw rod is in threaded connection with a third ball nut, and the lower end of the screw rod is provided with an adjusting block.
Preferably, the inner side wall of the connecting ring is in sliding connection with a sliding groove formed in the outer surface of the supporting column through a sliding block.
Preferably, the arcing recorder is disposed between the first arcing sensor and the second arcing sensor.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention is provided with a detection mechanism which consists of a control cabinet, a vehicle shooting camera, an arc burning recording camera, a first arc burning sensor and a second arc burning sensor, obtains the license plate number information of a passing vehicle by using an image recognition technology under the action of the vehicle shooting camera, the arc burning recording camera, the first arc burning sensor and the second arc burning sensor, and uploads the arc burning image information, the character report information and the corresponding vehicle information which exceed the standard in real time based on the safety threshold value and the alarm threshold value of the arc burning time length. The device can perform fixed-point real-time online detection on weak pantograph-catenary current collection such as a section insulator, an anchor section joint, rigid-flexible transition, turnouts and the like, and provides a direct basis for a later-stage operation unit to grasp the operation state of equipment in real time, develop equipment operation and maintenance and timely process related equipment problems;
2. the vehicle shooting camera is arranged on one side, far away from the first ball nut, of the connecting ring, can adjust the monitoring range according to the monitored road section and the height of the vehicle, and can effectively detect the information of the vehicle;
3. according to the invention, the vehicle passing detection module, the arcing signal processor and the information recording and processing machine are arranged in the control cabinet, the wireless signal module comprises the WIFE module and the 4G module, and the vehicle passing detection module, the arcing signal processor and the information recording and processing machine can be used for rapidly collecting, sorting and separating vehicle information, fusing data and image data, and having high automation and integration degree and facilitating the operation of background workers.
Drawings
FIG. 1 is a front view of an adjustable bow net arcing fixed point on-line detection device;
FIG. 2 is a schematic view showing the connection between a fixing base and a supporting plate of an adjustable bow net arcing fixed point on-line detection device;
FIG. 3 is a transverse sectional view of an adjustable bow net arc-burning fixed point on-line detection device;
FIG. 4 is a schematic block diagram of an adjustable bow net arcing set point on-line detection device;
fig. 5 is a block diagram of a wireless signal module of an adjustable bow net arcing set-point on-line detection device.
In the figure: 1. an installation mechanism; 2. an adjustment mechanism; 3. a detection mechanism; 4. a wireless signal module; 41. a WIFE module; 42. a 4G module; 43. a cloud terminal; 44. a PC monitoring terminal; 5. a fixed base; 51. positioning bolts; 52. a fixing hole; 6. a support plate; 7. a support pillar; 71. a heat-conducting column; 72. a heat conducting block; 8. mounting a rod; 9. a solar panel; 10. a fixing plate; 11. a screw rod; 111. a third ball nut; 112. an adjusting block; 12. a first ball nut; 13. a second ball nut; 14. a connecting plate; 15. a connecting ring; 16. a snap ring; 17. a control cabinet; 171. a vehicle passing detection module; 172. an arcing signal processor; 173. an information recording and processing machine; 18. a vehicle camera; 19. an arcing recorder; 20. a first arcing sensor; 21. a second combustion arc sensor; 22. a reinforcing rod.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-5, the present invention provides a technical solution: an adjustable bow net arcing fixed point on-line detection device comprises an installation mechanism 1, an adjusting mechanism 2, a detection mechanism 3 and a wireless signal module 4, the mounting mechanism 1 consists of a fixed base 5, a supporting plate 6 and a supporting column 7, the upper end surface of the fixed base 5 is connected with a sliding block arranged at the lower end of the supporting plate 6 in a sliding way by arranging a groove, the upper end of the fixed base 5 is connected with a plurality of positioning bolts 51 through bolt holes, the lower end of the supporting column 7 is welded on the upper end surface of the supporting plate 6, the upper end of the supporting column 7 is welded with a mounting rod 8, the upper end of the mounting rod 8 is provided with a solar cell panel 9 through a bolt, the adjusting mechanism 2 is arranged on the mounting mechanism 1, the detection mechanism 3 is respectively arranged on the installation mechanism 1 and the adjusting mechanism 2, and the wireless signal module 4 is arranged on the detection mechanism 3.
According to the invention, the adjusting mechanism 2 comprises a fixing plate 10, a screw rod 11, a first ball nut 12 and a plurality of second ball nuts 13, the fixing plate 10 is welded on the side surface of one side of the upper end of the supporting column 7, the upper end and the lower end of the screw rod 11 are respectively installed on the fixing plate 10 and the supporting plate 6 through bearings, the screw rod 11 is in threaded connection with the first ball nut 12 and the second ball nut 13, a connecting plate 14 is welded on the upper end surface of the first ball nut 12, the connecting plate 14 is sleeved on the screw rod 11 through a circular hole, a connecting ring 15 is welded on one side of the connecting plate 14 close to the supporting column 7, the connecting ring 15 is sleeved on the outer surface of the supporting column 7, a clamping ring 16 is welded on one side of the second ball nut 13 close to the supporting column 7, and the clamping ring 16 is.
In the invention, the detection mechanism 3 is composed of a control cabinet 17, a vehicle shooting camera 18, an arc burning recording camera 19, a first arc burning sensor 20 and a second arc burning sensor 21, the control cabinet 17 is installed on the side surface of the clamp ring 16 far away from the side of the first ball nut 12 through bolts, the output end of the solar cell panel 9 is electrically connected with the input end of the control cabinet 17 through a lead, a vehicle passing detection module 171, an arc burning signal processor 172 and an information recording and processing machine 173 are installed inside the control cabinet 17, the output end of the vehicle passing detection module 171 is respectively connected with the input ends of the vehicle shooting camera 18, the arc burning recording camera 19, the first arc burning sensor 20 and the second arc burning sensor 21 through leads, the vehicle shooting camera 18 is installed on the side of the connecting ring 15 far away from the first ball nut 12 through a portal frame, and the output end of the vehicle shooting camera 18 is electrically connected with the input end of the information recording and processing machine 173 through leads And the arc recording camera 19, the first arc sensor 20 and the second arc sensor 21 are all mounted at the upper end of the support column 7 through bolts, the output ends of the arc recording camera 19, the first arc sensor 20 and the second arc sensor 21 are all electrically connected with the input end of the arc signal processor 172 through wires, and the output end of the arc signal processor 172 is electrically connected with the input end of the information recording and processing machine 173 through wires.
In the present invention, the wireless signal module 4 includes a WIFE module 41 and a 4G module 42, the WIFE module 41 and the 4G module 42 are both installed inside the control cabinet 17, the output end of the information recording and processing machine 173 is electrically connected to the wireless signal module 4, and the output end of the wireless signal module 4 is in signal connection with a cloud terminal 43 and a PC monitoring terminal 44.
Preferably, the fixing base 5 is provided with a plurality of fixing holes 52 on four sides of the supporting plate 6, which is beneficial to more stably fixing the whole device on the ground.
Preferably, the heat conducting column 71 is installed inside the supporting column 7 through a cavity, the plurality of heat conducting blocks 72 are welded on the outer side face of the heat conducting column 71, and the other ends of the heat conducting blocks 72 are in contact with the inner side wall of the supporting column 7, so that the heat dissipation performance of the whole device is increased, and the temperature around the device is increased.
Preferably, the reinforcing rod 22 is mounted on the lower end surface of the solar cell panel 9 through a bolt, and the lower end of the reinforcing rod 22 is welded on the upper end surface of the fixing plate 10, which is beneficial to increasing the stability of the solar cell panel 9.
Preferably, the screw 11 is connected with a third ball nut 111 at the upper end of the connecting plate 14 through a thread, and the lower end of the screw 11 is provided with an adjusting block 112, so that the connecting plate 14 can be better driven to move, and the screw 11 can be conveniently rotated.
In the invention, the inner side wall of the connecting ring 15 is in sliding connection with the sliding groove formed in the outer surface of the supporting column 7 through the mounting slide block, which is beneficial to increasing the stability of the connecting ring 15 in the moving process.
In the present invention, the arcing recording camera 19 is disposed between the first arcing sensor 20 and the second arcing sensor 21, which is beneficial to better record the conditions of the first arcing sensor 20 and the second arcing sensor 21.
The working principle is as follows: when the device is used, firstly, the fixing base 5 is fixed on the ground by inserting bolts into the fixing holes 52, the pantograph on the first arcing sensor 20 and the second arcing sensor 21 is contacted with a power grid, meanwhile, the height of the control cabinet 17 and the vehicle shooting camera 18 is adjusted according to the height of a passing vehicle, the height of the control cabinet 17 and the vehicle shooting camera 18 is adjusted by only rotating the adjusting block 112 to rotate the screw rod 11, the screw rod 11 rotates to drive the first ball nut 12, the second ball nut 13 and the third ball nut 111 to move, so that the connecting ring 15 and the snap ring 16 move, the height of the control cabinet 17 and the vehicle shooting camera 18 is adjusted, when the vehicle passes through, firstly, the vehicle passes through the detecting module 171 to detect, and then the vehicle shooting camera 18, the arcing recorder 19, the first arcing sensor 20 and the second arcing sensor 21 to record and shoot, the device obtains the license plate information of the passing vehicle by using the image recognition technology, and uploads the arc burning image information, the character report information and the corresponding vehicle information which exceed the standard after being processed by the information recording and processing machine 173 based on the safety threshold and the alarm threshold of the arc burning time. Can be to segmentation insulator, the anchor section joint, rigid and flexible transition, bow net current collection such as switch weak carries out fixed point real-time on-line measuring, the operation state of equipment is mastered in real time to later stage operation unit, develop equipment fortune dimension and in time handle relevant equipment problem and provide direct foundation, can adjust monitoring range according to the height of control highway section and vehicle, guarantee the information that can effectual detection vehicle, can be quick collect the arrangement and separate vehicle information, data and image data fuse mutually, it is automatic, the degree of integrating is high, make things convenient for backstage staff's operation.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The utility model provides a bow net arcing fixed point on-line measuring device with adjustable, includes installation mechanism (1), adjustment mechanism (2), detection mechanism (3) and wireless signal module (4), its characterized in that: the mounting mechanism (1) consists of a fixed base (5), a supporting plate (6) and a supporting column (7), the upper end surface of the fixed base (5) is connected with a slide block arranged at the lower end of the supporting plate (6) in a sliding way through a groove, the upper end of the fixed base (5) is connected with a plurality of positioning bolts (51) through bolt holes, the lower end of the supporting column (7) is fixedly arranged on the upper end surface of the supporting plate (6), the upper end of the supporting column (7) is fixedly provided with a mounting rod (8), the upper end of the mounting rod (8) is provided with a solar cell panel (9), adjustment mechanism (2) are installed on installation mechanism (1), detection mechanism (3) are installed respectively on installation mechanism (1) and adjustment mechanism (2), wireless signal module (4) are installed on detection mechanism (3).
2. The adjustable bow net arcing set point online detection device according to claim 1, characterized in that: the adjusting mechanism (2) is composed of a fixing plate (10), a screw rod (11), a first ball nut (12) and a plurality of second ball nuts (13), the fixing plate (10) is fixedly arranged on the side face of one side of the upper end of a supporting column (7), the upper end and the lower end of the screw rod (11) are movably arranged on the fixing plate (10) and the supporting plate (6) respectively, the screw rod (11) is in threaded connection with the first ball nut (12) and the second ball nuts (13), a connecting plate (14) is arranged on the upper end face of the first ball nut (12), the connecting plate (14) is sleeved on the screw rod (11) through a round hole, a connecting ring (15) is arranged on one side, close to the supporting column (7), of the connecting plate (14), the connecting ring (15) is sleeved on the outer surface of the supporting column (7), a clamping ring (16) is arranged on one side, close to the supporting column (7), of the second ball nut, the clamping ring (16) is sleeved on the outer surface of the supporting column (7).
3. The adjustable bow net arcing set point online detection device according to claim 1, characterized in that: the detection mechanism (3) consists of a control cabinet (17), a vehicle shooting camera (18), an arc burning recording camera (19), a first arc burning sensor (20) and a second arc burning sensor (21), the control cabinet (17) is arranged on the side face of one side, far away from the first ball nut (12), of the clamping ring (16), the output end of the solar cell panel (9) is electrically connected with the input end of the control cabinet (17), a vehicle is arranged inside the control cabinet (17) and is in control connection with the input ends of the vehicle shooting camera (18), the arc burning recording camera (19), the first arc burning sensor (20) and the second arc burning sensor (21) through a detection module (171), the vehicle shooting camera (18) is arranged on one side, far away from the first ball nut (12), of the connecting ring (15), the output of camera (18) is shot to the vehicle and the input electric connection of information recording and processor (173), arc recording camera (19), first arc sensor (20) and second arc sensor (21) are all installed in the upper end of support column (7), the output of arc recording camera (19), first arc sensor (20) and second arc sensor (21) all with the input electric connection of arcing signal processor (172), the output of arcing signal processor (172) and the input electric connection of information recording and processor (173).
4. The adjustable bow net arcing set point online detection device according to claim 1, characterized in that: wireless signal module (4) include WIFE module (41) and 4G module (42), WIFE module (41) and 4G module (42) all set up inside switch board (17), the output and wireless signal module (4) electric connection of information record and processor (173), the output end signal connection of wireless signal module (4) has cloud terminal (43) and PC monitor terminal (44).
5. The adjustable bow net arcing set point online detection device according to claim 1, characterized in that: the four sides of the supporting plate (6) on the fixed base (5) are provided with a plurality of fixing holes (52).
6. The adjustable bow net arcing set point online detection device according to claim 1, characterized in that: the heat conduction column (71) is installed in the supporting column (7) through arranging a cavity, a plurality of heat conduction blocks (72) are arranged on the outer side face of the heat conduction column (71), and the other ends of the heat conduction blocks (72) are connected with the inner side wall of the supporting column (7).
7. The adjustable bow net arcing set point online detection device according to claim 2, wherein: the lower end face of the solar cell panel (9) is provided with a reinforcing rod (22), and the lower end of the reinforcing rod (22) is arranged on the upper end face of the fixing plate (10).
8. The adjustable bow net arcing set point online detection device according to claim 2, wherein: and a third ball nut (111) is in threaded connection with the upper end of the connecting plate (14) on the screw rod (11), and an adjusting block (112) is installed at the lower end of the screw rod (11).
9. The adjustable bow net arcing set point online detection device according to claim 2, wherein: the inner side wall of the connecting ring (15) is in sliding connection with a sliding groove formed in the outer surface of the supporting column (7) through a sliding block.
10. The adjustable bow net arcing set point online detection device according to claim 3, wherein: the arcing recorder (19) is arranged between a first arcing sensor (20) and a second arcing sensor (21).
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| CN201910739035.XA CN112394260A (en) | 2019-08-12 | 2019-08-12 | Adjustable bow net arcing fixed point on-line detection device |
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| CN201910739035.XA CN112394260A (en) | 2019-08-12 | 2019-08-12 | Adjustable bow net arcing fixed point on-line detection device |
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Application publication date: 20210223 |