CN211178673U - Remote calibration device for fiber bragg grating liquid level meter sensor - Google Patents
Remote calibration device for fiber bragg grating liquid level meter sensor Download PDFInfo
- Publication number
- CN211178673U CN211178673U CN202020107074.6U CN202020107074U CN211178673U CN 211178673 U CN211178673 U CN 211178673U CN 202020107074 U CN202020107074 U CN 202020107074U CN 211178673 U CN211178673 U CN 211178673U
- Authority
- CN
- China
- Prior art keywords
- liquid level
- level meter
- meter sensor
- grating liquid
- bragg grating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The utility model discloses a remote calibration device for a fiber grating liquid level meter sensor, which comprises a calibration bracket, a control module, a stepping motor, a lead screw and an installation bracket for installing the fiber grating liquid level meter sensor; the control module and the stepping motor are arranged at the upper part of the calibration bracket, and the control module is in communication connection with the remote control end and controls the forward rotation or the reverse rotation of the stepping motor; an output shaft of the stepping motor is connected with a screw rod below the stepping motor, a movable block is arranged on the screw rod, an installation support is fixed on the movable block, and a fiber bragg grating liquid level meter sensor is fixed on the installation support; after the control module receives a calibration instruction of the remote control end, the control module drives the stepping motor to rotate and drives the fiber grating liquid level meter sensor to move up and down, and the detection precision of the fiber grating liquid level meter sensor is determined by presetting the difference value between the standard displacement of the fiber grating liquid level meter sensor rising or falling and the detection displacement detected by the fiber grating liquid level meter sensor.
Description
Technical Field
The utility model relates to a mark the field, especially relate to a long-range calibration device for fiber grating level gauge sensor.
Background
In long-term operation, the railroad bridge needs to bear the designed operation load, and also needs to bear the action of the train with the speed-up, heavy load and overweight goods, and is subjected to the invasion of natural disasters such as earthquake, flood, debris flow and the like, the erosion of wind, rain, ice and harmful substances, the accidental impact of vehicles or ships and the like. Therefore, the health state monitoring of the railway bridge is enhanced, scientific basis is provided for maintenance, and the method has important significance for ensuring the safe and smooth railway transportation.
The bridge settlement monitoring is usually detected by fiber bragg grating liquid level meter sensors, and a plurality of fiber bragg grating liquid level meter sensors are arranged on a bridge pier to be detected and used for monitoring the relative settlement of multiple points, namely the change of the vertical displacement of each measuring point relative to a reference point, so that the relative settlement of each measuring point is accurately calculated. In order to ensure the accuracy of the bridge monitoring data, the precision of the fiber bragg grating liquid level meter sensor needs to be calibrated regularly; however, the railway bridge is remote relative to the geographic position, the environment is severe, and the traffic is inconvenient, so that great difficulty is brought to the regular calibration work of the precision of the fiber grating liquid level meter sensor.
Disclosure of Invention
The utility model discloses the main technical problem who solves provides a long-range calibration device for fiber grating level gauge sensor, solves fiber grating level gauge sensor and uses the problem of regularly maring the difficulty when the railway bridge control.
In order to solve the technical problem, the utility model adopts a technical scheme that a remote calibration device for a fiber grating liquid level meter sensor is provided, which comprises a calibration bracket, a control module, a stepping motor, a screw rod and an installation bracket for installing the fiber grating liquid level meter sensor; the control module is electrically connected with the stepping motor and arranged at the upper part of the calibration bracket, and the control module is in communication connection with the remote control end and is used for controlling the forward rotation or the reverse rotation of the stepping motor; the output shaft of the stepping motor is connected with a screw rod below, a movable block is arranged on the screw rod, the movable block is fixed with the mounting bracket, and the fiber grating liquid level meter sensor is fixed on the mounting bracket.
Preferably, sliding rails are symmetrically arranged on the left side and the right side of the calibration support along the axial direction of the screw rod; the cross section of the mounting bracket is U-shaped, sliding chutes matched with the sliding rails are correspondingly arranged on the bottom surface of the mounting bracket along the axial direction of the screw rod, a plurality of pulleys are arranged in the sliding chutes, and the pulleys are contacted with the surfaces of the sliding rails; the middle part of the bottom surface of the mounting bracket is also provided with a connecting block used for connecting the movable block.
Preferably, the fiber grating liquid level meter sensor is fixed on the mounting bracket through a fastening device, the fastening device comprises limiting blocks and a hoop, the limiting blocks are symmetrically arranged on the left side and the right side of the upper surface of the mounting bracket, and two opposite inner side surfaces of the two limiting blocks are inclined surfaces gradually approaching from top to bottom and used for clamping the fiber grating liquid level meter sensor; the fiber bragg grating liquid level meter sensor is tightly held by a hoop, and two ends of the hoop are fixed on the top surfaces of the corresponding limiting blocks through bolts respectively.
Preferably, a plurality of connecting holes are uniformly formed in the upper surface of the mounting support, a plurality of connecting lugs are arranged at the edge of the limiting block, a through hole is formed in each connecting lug, and a bolt penetrates through the through hole and is connected with the connecting holes to fix the limiting block on the upper surface of the mounting support.
Preferably, anti-skidding rubber mats for preventing the fiber bragg grating liquid level meter sensor from sliding are arranged on the inner side face of the hoop and the inner side face of the limiting block.
Preferably, in two in the stopper, the leading flank of one of them stopper articulates a bearing bar, and the leading flank of another stopper corresponds and is provided with the draw-in groove, but the joint after the bearing bar rotates in the draw-in groove for support fiber grating level gauge sensor.
preferably, the remote calibration device is fixed on a wall body through a fixing support, the cross section of the fixing support is in an inverted L shape and comprises a support plate and a fixing plate which are perpendicular to each other, the support plate is used for connecting the calibration device, a plurality of mounting holes are formed in the support plate, a connecting plate is fixed at the lower end of the calibration support, the connecting plate is perpendicular to the calibration support, a plurality of mounting holes are correspondingly formed in the connecting plate, the connecting plate penetrates through the mounting holes through bolts to be connected and fixed with the support plate, and the fixing plate is fixed on the wall body.
Preferably, a strip-shaped hole is formed in the fixing plate, the bolt penetrates through the strip-shaped hole to fix the fixing plate on the wall body, and the strip-shaped hole further comprises a transverse strip-shaped hole used for adjusting the transverse position of the fixing support and a longitudinal strip-shaped hole used for adjusting the longitudinal position of the fixing support.
The invention has the beneficial effects that: the utility model discloses a remote calibration device for a fiber grating liquid level meter sensor, which comprises a calibration bracket, a control module, a stepping motor, a lead screw and an installation bracket for installing the fiber grating liquid level meter sensor; the control module and the stepping motor are arranged at the upper part of the calibration bracket, and the control module is in communication connection with the remote control end and controls the forward rotation or the reverse rotation of the stepping motor; an output shaft of the stepping motor is connected with a screw rod below the stepping motor, a movable block is arranged on the screw rod, an installation support is fixed on the movable block, and a fiber bragg grating liquid level meter sensor is fixed on the installation support; after the control module receives a calibration instruction of the remote control end, the control module drives the stepping motor to rotate and drives the fiber grating liquid level meter sensor to move up and down, and the detection precision of the fiber grating liquid level meter sensor is determined by presetting the difference value between the standard displacement of the fiber grating liquid level meter sensor rising or falling and the detection displacement detected by the fiber grating liquid level meter sensor.
Drawings
Fig. 1 is an overall schematic diagram of an embodiment of a remote calibration apparatus for a fiber grating level gauge sensor according to the present invention;
FIG. 2 is a block diagram of a mounting bracket for another embodiment of a remote calibration apparatus for a fiber grating level gauge sensor according to the present invention;
FIG. 3 is a schematic view of a fastening device according to another embodiment of the present invention for a remote calibration device of a fiber grating level gauge sensor;
Fig. 4 is a schematic view of the inner side surface of a hoop of another embodiment of the remote calibration device for the fiber grating liquid level meter sensor according to the present invention;
Fig. 5 is a schematic view of a fixing bracket of another embodiment of a remote calibration device for a fiber grating level gauge sensor according to the present invention;
Fig. 6 is a schematic view of a fixing plate in a fixing bracket according to another embodiment of the remote calibration device for the fiber grating level gauge sensor of the present invention;
Fig. 7 is a schematic diagram of a calibration process according to another embodiment of the present invention.
Detailed Description
In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and specific examples. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It is to be noted that, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, the remote calibration device for the fiber bragg grating level gauge sensor comprises a calibration bracket 1, a control module 2, a stepping motor 3, a screw rod 4 and a mounting bracket 5 for mounting the fiber bragg grating level gauge sensor. The control module 2 and the stepping motor 3 are arranged at the upper part of the calibration bracket 1, the control module 2 is electrically connected with the stepping motor, and the control module 2 is in communication connection with the remote control end and is used for controlling the forward rotation or the reverse rotation of the stepping motor 3; the stepping motor 3 is fixed on the control module 2 through a motor bracket 6. An output shaft of the stepping motor 3 is connected with a screw rod 4 below, a movable block is arranged on the screw rod 4, a mounting bracket 5 is fixed on the movable block, and the mounting bracket 5 is used for fixing a fiber grating liquid level meter sensor. And a travel switch 7 is also arranged on the right side of the calibration bracket 1 and used for controlling the travel of the up-and-down movement of the mounting bracket 5.
Referring to fig. 1 and 2, in fig. 1, slide rails H are symmetrically arranged on the left and right sides of the calibration bracket 1 along the axial direction of the screw rod 4. In fig. 2, the cross section of the mounting bracket 5 is U-shaped, a sliding groove 52 adapted to the sliding rail H is correspondingly arranged on the bottom surface of the mounting bracket 5 along the axial direction of the screw rod 4, a plurality of pulleys 53 are installed in the sliding groove 52, and the pulleys 53 are in contact with the surface of the sliding rail H, so that the mounting bracket 5 slides on the sliding rail H.
The middle part of the bottom surface of the mounting bracket 5 is also provided with a connecting block 51 which is used for fixing with the movable block 41 on the screw rod 4, and the connecting block and the movable block can be fixed in a common mode such as welding. When the screw rod 4 rotates, the movable block 41 moves up and down, and further drives the mounting bracket 5 to move up and down.
Further, as shown in fig. 3, the fiber grating level meter sensor 8 is fixed on the mounting bracket 5 through a fastening device, the fastening device includes a limiting block 9 and a hoop 10, the limiting block 9 is symmetrically disposed on the left and right sides of the upper surface of the mounting bracket 5, and two opposite inner side surfaces 902 of the two limiting blocks 9 are inclined surfaces gradually approaching from top to bottom for clamping the fiber grating level meter sensor 8. The fiber bragg grating level gauge sensor 8 is tightly held by an anchor ear 10, and two ends 101 of the anchor ear 10 are respectively fixed on the top surfaces 901 of the corresponding limiting blocks 9 through bolts 11.
Preferably, in two stopper in fig. 3, the leading flank of one of them stopper articulates a bearing bar 12, and the leading flank of another stopper corresponds and is provided with draw-in groove 13, but bearing bar 12 rotates the back joint in draw-in groove 13 for support fiber grating level gauge sensor 8, prevent to support fiber grating level gauge sensor 8 and drop.
Further, with reference to fig. 1, a plurality of connection holes 51 are uniformly formed in the upper surface of the mounting bracket 5, in fig. 3, a connection lug 91 is formed at the edge of the limiting block 9, a through hole (not shown) is formed in the connection lug 91, the bolt 11 passes through the through hole and is connected with the connection hole 51 to fix the limiting block 9 on the mounting bracket 5, only one connection lug 91 is shown in fig. 3, and a plurality of connection lugs 91 can be formed at the edge of the limiting block 9 to further enhance the stability. The distance between the two limiting blocks 9 is adjusted to adapt to the fiber bragg grating liquid level meter sensors 8 with different diameters.
Preferably, as shown in fig. 4, an anti-slip rubber pad 14 is disposed on the inner side surface 102 of the anchor ear 10, and the anti-slip rubber pad 14 can enhance friction between the anchor ear 10 and the outer surface of the fiber grating level gauge sensor 8, so as to prevent the fiber grating level gauge sensor 8 from slipping off.
Preferably, an anti-slip rubber pad 14 is also arranged on the inner side surface 902 of the limit block 9, and the arrangement of the anti-slip rubber pad 14 enhances the friction force between the inner side surface 902 and the outer surface of the fiber grating level gauge sensor 8. On the other hand, in the process of fixing the fiber grating liquid level meter sensor 8, the anti-slip rubber pad 14 prevents the inner side surface 102 of the hoop 10 or the inner side surface 902 of the limiting block 9 from directly contacting the outer surface of the fiber grating liquid level meter sensor 8, and plays a role in preventing the outer surface of the fiber grating liquid level meter sensor 8 from being scratched.
as shown in fig. 5, the remote calibration device is fixed on a wall through a fixing support 15, the cross section of the fixing support 15 is in an inverted "L" shape, and includes a support plate 151 and a fixing plate 152 that are perpendicular to each other, the support plate 151 is used for connecting the remote calibration device, a plurality of mounting holes are provided on the support plate 151, the lower end of the calibration support 1 is fixed at the front end of the connecting plate 16, the connecting plate 16 is perpendicular to the calibration support 1, a plurality of mounting holes are also provided at corresponding positions on the connecting plate 16, and the bolts 11 pass through the mounting holes and are screwed with nuts to fix the connecting plate 16 and the support plate 151.
Referring to fig. 6, the fixing plate 152 is provided with strip holes (1521, 1522), and the bolt 17 passes through the strip holes to fix the fixing plate 152 on the wall. It can be seen that, on fixed plate 152, the bar hole includes vertical bar hole 1521 and horizontal bar hole 1522, and the setting of vertical bar hole 1521 is in order to conveniently adjust fixed bolster 15 from top to bottom when the elevation of fixed bolster 15, and need not take out the bolt in the wall and fix once more. The transverse strip hole 1522 is provided for facilitating the left-right adjustment of the fixing bracket 15.
Preferably, the bolt 17 is a chemical bolt or an expansion bolt.
Preferably, in fig. 1, the control module 2 includes a main control chip, a network module, a power module, and a driving module. The network module is provided with an Ethernet interface and can be connected to a public network through a local area network, each calibration device is provided with an independent IP address, the data platform can send a calibration instruction to the remote calibration device after being remotely connected to the remote calibration device through the public network, the remote calibration device controls the stepping motor to drive the screw rod to rotate, and the screw rod drives the fiber grating liquid level meter sensor to perform simulated lifting. The fiber bragg grating liquid level meter sensor detects displacement change, a detection result is sent to the data platform, the data platform compares the simulation data with the actual measurement data, and the precision of the calibrated fiber bragg grating liquid level meter sensor is calculated.
Preferably, in fig. 1, the lead of the lead screw 4 is 4mm, the lead screw is driven by a stepping motor with a step angle of 1.8 degrees, and the step motor rotates one turn 360/1.8, which is 200 steps, so that the stroke of each step of the stepping motor is as follows: the precision of the screw rod 4 is 0.02mm, namely the precision of the remote calibration device can reach 0.02 mm; the output displacement accuracy of the screw can be improved by further subdividing the step angle of the stepper motor driver.
as shown in fig. 7, in the calibration process, after the control module 2 receives the calibration instruction from the remote control end, the stepping motor 3 is driven to rotate and drive the fiber grating level meter sensor 8 to move up and down, the detection precision of the fiber grating level meter sensor 8 is determined by presetting the standard displacement h of the fiber grating level meter sensor 8 in an ascending or descending manner (the fiber grating level meter sensor 8 in the descending manner is exemplified in fig. 3) and the difference | h- △ h | between the detection displacement △ h detected by the fiber grating level meter sensor 8, and the error of the fiber grating level meter sensor 8 in the detection process can be eliminated by the difference | h- △ h | so that the detection data finally reflected at the remote control end is more accurate.
On the other hand, when the calibration device performs initial elevation, elevation is performed on the fixed support through manual work, and the calibration device is fixed on the fixed support, so that the elevation of the fiber grating liquid level meter sensor 8 is completed. Because the installation accuracy of manual work to the fixed bolster is lower, has the error in longitudinal direction, consequently, can carry out the ascending or descending of trace through remote calibration device, make the initial elevation of every fiber grating level gauge sensor keep unanimous.
Therefore, the utility model discloses a remote calibration device for a fiber grating liquid level meter sensor, which comprises a calibration bracket, a control module, a stepping motor, a screw rod and a mounting bracket for mounting the fiber grating liquid level meter sensor; the control module and the stepping motor are arranged at the upper part of the calibration bracket, and the control module is in communication connection with the remote control end and controls the forward rotation or the reverse rotation of the stepping motor; an output shaft of the stepping motor is connected with a screw rod below the stepping motor, a movable block is arranged on the screw rod, an installation support is fixed on the movable block, and a fiber bragg grating liquid level meter sensor is fixed on the installation support; after the control module receives a calibration instruction of the remote control end, the control module drives the stepping motor to rotate and drives the fiber grating liquid level meter sensor to move up and down, and the detection precision of the fiber grating liquid level meter sensor is determined by presetting the difference value between the standard displacement of the fiber grating liquid level meter sensor rising or falling and the detection displacement detected by the fiber grating liquid level meter sensor.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. The utility model provides a long-range calibration device for fiber grating level gauge sensor which characterized in that: the device comprises a calibration bracket, a control module, a stepping motor, a screw rod and a mounting bracket for mounting a fiber bragg grating liquid level meter sensor; the control module is electrically connected with the stepping motor and arranged at the upper part of the calibration bracket, and the control module is in communication connection with the remote control end and is used for controlling the forward rotation or the reverse rotation of the stepping motor; the output shaft of the stepping motor is connected with a screw rod below, a movable block is arranged on the screw rod, the movable block is fixed with the mounting bracket, and the fiber grating liquid level meter sensor is fixed on the mounting bracket.
2. The remote calibration device for the fiber bragg grating liquid level meter sensor according to claim 1, wherein: sliding rails are symmetrically arranged on the left side and the right side of the calibration support along the axial direction of the screw rod; the cross section of the mounting bracket is U-shaped, sliding chutes matched with the sliding rails are correspondingly arranged on the bottom surface of the mounting bracket along the axial direction of the screw rod, a plurality of pulleys are arranged in the sliding chutes, and the pulleys are contacted with the surfaces of the sliding rails; the middle part of the bottom surface of the mounting bracket is also provided with a connecting block used for connecting the movable block.
3. The remote calibration device for the fiber bragg grating liquid level meter sensor according to claim 2, wherein: the fiber bragg grating liquid level meter sensor is fixed on the mounting bracket through a fastening device, the fastening device comprises limiting blocks and a hoop, the limiting blocks are symmetrically arranged on the left side and the right side of the upper surface of the mounting bracket, and two opposite inner side surfaces of the two limiting blocks are inclined surfaces gradually approaching from top to bottom and used for clamping the fiber bragg grating liquid level meter sensor; the fiber bragg grating liquid level meter sensor is tightly held by a hoop, and two ends of the hoop are fixed on the top surfaces of the corresponding limiting blocks through bolts respectively.
4. The remote calibration device for the fiber bragg grating liquid level meter sensor according to claim 3, wherein: the upper surface of installing support evenly is provided with a plurality of connecting holes, the edge of stopper is provided with a plurality of engaging lugs, has all seted up the through-hole on every engaging lug, and the bolt passes the through-hole and will after being connected with the connecting hole the stopper is fixed the upper surface of installing support.
5. The remote calibration device for the fiber bragg grating liquid level meter sensor according to claim 4, wherein: and anti-skidding rubber pads for preventing the fiber bragg grating liquid level meter sensor from sliding are arranged on the inner side face of the hoop and the inner side face of the limiting block.
6. The remote calibration device for the fiber bragg grating liquid level meter sensor according to claim 5, wherein: in two in the stopper, the leading flank of one of them stopper articulates a bearing bar, and the leading flank of another stopper corresponds and is provided with the draw-in groove, but the joint after the bearing bar rotates in the draw-in groove for support fiber grating level gauge sensor.
7. the remote calibration device for the fiber bragg grating liquid level meter sensor according to claim 1, wherein the remote calibration device is fixed on a wall body through a fixing support, the fixing support is of an inverted L-shaped cross section and comprises a support plate and a fixing plate which are perpendicular to each other, the support plate is used for connecting the calibration device, a plurality of mounting holes are formed in the support plate, a connecting plate is fixed at the lower end of the calibration support and perpendicular to the calibration support, a plurality of mounting holes are correspondingly formed in the connecting plate, the connecting plate penetrates through the mounting holes through bolts and is fixedly connected with the support plate, and the fixing plate is fixed on the wall body.
8. The remote calibration device for the fiber bragg grating liquid level meter sensor according to claim 7, wherein: the fixed plate is provided with a strip-shaped hole, a bolt penetrates through the strip-shaped hole to fix the fixed plate on a wall body, and the strip-shaped hole further comprises a transverse strip-shaped hole used for adjusting the transverse position of the fixed support and a longitudinal strip-shaped hole used for adjusting the longitudinal position of the fixed support.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020107074.6U CN211178673U (en) | 2020-01-17 | 2020-01-17 | Remote calibration device for fiber bragg grating liquid level meter sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020107074.6U CN211178673U (en) | 2020-01-17 | 2020-01-17 | Remote calibration device for fiber bragg grating liquid level meter sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211178673U true CN211178673U (en) | 2020-08-04 |
Family
ID=71799231
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020107074.6U Active CN211178673U (en) | 2020-01-17 | 2020-01-17 | Remote calibration device for fiber bragg grating liquid level meter sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211178673U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113003514A (en) * | 2021-05-08 | 2021-06-22 | 王永雪 | Metering device for filling of fine chemical products |
| CN113090923A (en) * | 2021-04-22 | 2021-07-09 | 汇中仪表股份有限公司 | Sensor inner-pasting installation structure for ultrasonic flow measurement and installation adjustment method |
| CN113156602A (en) * | 2021-04-28 | 2021-07-23 | 常州联影智融医疗科技有限公司 | Adaptive fastening device for fixing optical element and control method thereof |
-
2020
- 2020-01-17 CN CN202020107074.6U patent/CN211178673U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113090923A (en) * | 2021-04-22 | 2021-07-09 | 汇中仪表股份有限公司 | Sensor inner-pasting installation structure for ultrasonic flow measurement and installation adjustment method |
| CN113090923B (en) * | 2021-04-22 | 2023-02-28 | 汇中仪表股份有限公司 | Sensor inner-paste mounting structure for ultrasonic flow measurement and mounting adjustment method |
| CN113156602A (en) * | 2021-04-28 | 2021-07-23 | 常州联影智融医疗科技有限公司 | Adaptive fastening device for fixing optical element and control method thereof |
| CN113003514A (en) * | 2021-05-08 | 2021-06-22 | 王永雪 | Metering device for filling of fine chemical products |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN211178673U (en) | Remote calibration device for fiber bragg grating liquid level meter sensor | |
| CN101348213B (en) | Mounting method of crane sliding contact line in workshop | |
| CN101398326B (en) | Four-angle weighing apparatus for vehicle | |
| CN103454097B (en) | Railway vehicle bogie static load comprehensive detection system | |
| CN211178415U (en) | Bridge settlement monitoring device | |
| AU2005265414A1 (en) | Apparatus for detecting hunting and angle of attack of a rail vehicle wheelset | |
| CN202403773U (en) | On-line verification/ calibration device for open channel flow meter | |
| CN110411407B (en) | Measuring device and differential settlement real-time detection system | |
| CN100430692C (en) | Laser depth measuring instrument for pavement structure | |
| CN106368125A (en) | Adjusting method and adjusting device for line shape of straddle type single-track traffic route | |
| CN110329286A (en) | Single-rail intelligent patrol inspection vehicle | |
| CN108362250B (en) | Third rail measuring mechanical arm for subway | |
| CN203422232U (en) | Rail vehicle bogie static load detection system | |
| CN108645310B (en) | Parameter measurement device for evacuation platform girder steel in subway tunnel | |
| CN219301590U (en) | Device for monitoring settlement and deviation of railway sleeper | |
| CN104251759A (en) | Calibration device and method for six-dimensional force sensor of car end relationship test stand | |
| CN111458089B (en) | Bridge deflection detection system | |
| CN210441772U (en) | Equipment for measuring assembly tolerance of bridge expansion device | |
| CN108362912B (en) | Flow velocity meter calibrating device and calibrating method thereof | |
| CN214277014U (en) | Roadbed mechanical quality state detection system and tamping car | |
| CN217052952U (en) | Flatness detection device for highway engineering | |
| JP2011174351A (en) | Measurement management method for confirming safety of train travel | |
| CN2723290Y (en) | Limit detecting small car of straddle seat type single rail device | |
| CN219315387U (en) | Step-by-step movable track panel fine adjustment vehicle | |
| CN201837345U (en) | Measuring tool for producing two-block type sleeper |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |