CN215042743U - Track limit measuring instrument - Google Patents

Abstract

The utility model relates to a track limit measuring apparatu, including the shallow support, the walking wheel, leading wheel and range finding sensor, the shallow support includes the shallow main part and installs the sensor installing support in the shallow main part, the both sides that are relative along its left and right directions of shallow main part are provided with the walking wheel respectively, the walking wheel is used for the roof rolling contact with the track roof beam, the shallow main part is provided with the leading wheel respectively along its left and right directions relative both sides, the leading wheel is used for the lateral wall rolling contact with the track roof beam, range finding sensor installs on the sensor installing support, and a distance that is used for detecting the peripheral barrier of track roof beam to range finding sensor. The distance measuring sensor can detect the distance between the obstacle along the track beam and the distance measuring sensor to judge whether the obstacle invades into the limit. And the guide wheel can play the effect of direction and spacing to the direction of walking to avoid the data that range sensor measured to take place the skew because of track limit measuring apparatu and appear the error, improve measurement accuracy.

Description

Track limit measuring instrument

Technical Field

The disclosure relates to the technical field of track detection equipment, in particular to a track limit measuring instrument.

Background

With the increasing travel of the masses of people, the high-speed railway of China rushes out of China and runs to the whole world. The efficiency and the safety of the high-speed railway are important guarantees for people to go out. In order to ensure that the train has enough running space and running safety, the peripheral obstacles of the track need to be measured quickly and accurately during the construction process and before delivery operation.

The obstacles around the track are distributed on two sides of the track line, mainly including high column annunciators, short annunciators, various boxes and the like, the limits of various devices are different according to the difference of the installation heights and the speed grades of the track, and the limits of the obstacles cannot be accurately measured during the installation of the devices, so that the installed signal devices and the like are very likely to invade the limits, and the railway line after the operation is opened is prone to train scratch accidents. In the construction at the present stage, the clearance measurement of the obstacles around the signal track generally adopts a manual measurement mode, a measurer measures the distance between the obstacles and the track through a steel tape, and the problems that the central position and the measurement angle of a line are difficult to master, the horizontal measurement cannot be directly carried out, the measurement efficiency is low, the artificial errors are more, the measurement precision is low, the artificial measurement is difficult to realize stable measurement, and the requirements of high standard and high precision are difficult to meet exist in the measurement process.

SUMMERY OF THE UTILITY MODEL

The purpose of this disclosure is to provide a track limit measuring instrument to solve the technical problems existing in the related art.

In order to realize above-mentioned purpose, this disclosure provides a track limit measuring apparatu, including shallow support, walking wheel, leading wheel and range finding sensor, shallow support includes the shallow main part and installs sensor installing support in the shallow main part, the relative both sides of direction about it of shallow main part are provided with respectively the walking wheel, the walking wheel is used for the roof rolling contact with track roof beam, the shallow main part is followed its relative both sides of direction about are provided with respectively the leading wheel, the leading wheel be used for with the lateral wall rolling contact of track roof beam, range finding sensor installs on the sensor installing support, and be used for detecting the peripheral barrier of track roof beam arrives range finding sensor's distance.

Optionally, the track limit measuring instrument comprises a plurality of distance measuring sensor groups, each distance measuring sensor group comprises at least one distance measuring sensor, the sensor mounting bracket extends along the up-down direction, and the distance measuring sensor groups are arranged on the sensor mounting bracket at intervals along the up-down direction.

Optionally, each of the distance measuring sensor groups includes two distance measuring sensors, and the two distance measuring sensors in each of the distance measuring sensor groups are arranged on the sensor mounting bracket along the left-right direction.

Optionally, at least one said ranging sensor group is arranged to be located between a first portion of the track beam for supporting a left wheel of a rail vehicle and a second portion of the track beam for supporting a right wheel of the rail vehicle, at least one said ranging sensor group being arranged to be located above the track beam.

Optionally, the ranging sensors in at least one of the ranging sensor groups are arranged to be inclined upwards at an angle, so that the sensing direction of the ranging sensors forms an included angle with the horizontal direction.

Optionally, the rail clearance measuring instrument further comprises a mounting block and a locking member, a sliding groove extending in the vertical direction is formed on the sensor mounting bracket, the mounting block is slidably connected to the sliding groove, the distance measuring sensor is mounted on the mounting block, and the locking member is used for locking the mounting block in the sliding groove in an unlocking manner.

Optionally, a long hole extending in the up-down direction is formed in the sensor mounting bracket, the long hole is communicated with the chute, the locking member includes a bolt, a threaded hole is formed in the mounting block, and the bolt penetrates through the long hole and is in threaded connection with the threaded hole.

Optionally, two guide wheels oppositely arranged along the left-right direction of the cart main body form a guide wheel set, and a plurality of guide wheel sets are arranged at intervals along the front-back direction of the cart main body;

the two walking wheel sets are oppositely arranged along the left and right directions of the trolley main body to form walking wheel sets, and a plurality of walking wheel sets are arranged along the front and back directions of the trolley main body at intervals.

Optionally, the guide wheels are detachably connected with the cart body.

Optionally, the track limit measuring instrument further comprises a controller and an alarm, the distance measuring sensor and the alarm are both electrically connected with the controller, and the controller is used for controlling the alarm to give an alarm when the distance measuring sensor determines that an obstacle exists in the limit range of the track beam.

Through the technical scheme, when the track clearance is measured, the trolley main body can be used as a carrier of the distance measuring sensor, so that when the trolley main body travels along the track beam, the distance between the obstacle along the track beam and the distance measuring sensor can be detected through the distance measuring sensor, and whether the periphery of the track beam has the obstacle to enter the clearance or not is judged through the measured distance. In addition, the trolley main body is also provided with a guide wheel, the guide wheel is in rolling contact with the side wall of the track beam, and in the traveling process of the track limit measuring instrument, the guide wheel can play a role in guiding and limiting the traveling direction of the track limit measuring instrument, so that the track limit measuring instrument is prevented from moving in the left and right directions, errors of data measured by the distance measuring sensor due to the deviation of the track limit measuring instrument are avoided, and the measuring precision of the track limit measuring instrument is further improved.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

FIG. 1 is a perspective view of a rail clearance gauge provided by an exemplary embodiment of the present disclosure;

FIG. 2 is a schematic view of a rail clearance gauge coupled to a rail beam according to an exemplary embodiment of the present disclosure;

FIG. 3 is a schematic front view of a rail clearance gauge provided in an exemplary embodiment of the present disclosure;

FIG. 4 is an enlarged view of portion A of FIG. 3;

FIG. 5 is a side view schematic of a rail clearance gauge provided in an exemplary embodiment of the present disclosure;

FIG. 6 is a top view schematic of a sensor mounting bracket and mounting block of a rail-bound gauge provided in accordance with an exemplary embodiment of the present disclosure.

Description of the reference numerals

1-rail clearance measuring instrument; 10-a cart support; 11-a cart body; 110-a sensor mounting bracket; 1101-a chute; 20-a range sensor group; 21-a ranging sensor; 30-a traveling wheel; 40-a guide wheel; 50-a mounting block; 60-bolt; 70-a storage battery; 80-a cart handle; 100-track beam.

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, unless otherwise stated, the terms of orientation such as "upper, lower, left, right, front, and rear" are generally defined with reference to the normal running state of the rail clearance gauge on the rail beam, as shown in fig. 1 to 3. "inner and outer" refer to the inner and outer of the outline of the corresponding structure, and "distal and proximal" refer to the distance and proximity from the corresponding structure. Furthermore, the terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Referring to fig. 1 to 6, the present disclosure provides a rail clearance measuring instrument 1, including a cart support 10, traveling wheels 30, guide wheels 40, and a distance measuring sensor 21, where the cart support 10 includes a cart main body 11 and a sensor mounting support 110 mounted on the cart main body 11, the two sides of the cart main body 11 opposite to each other in the left-right direction are respectively provided with the traveling wheels 30, the traveling wheels 30 are used for rolling contact with the top wall of a rail beam 100, the two sides of the cart main body 11 opposite to each other in the left-right direction are respectively provided with the guide wheels 40, the guide wheels 40 are used for rolling contact with the side walls of the rail beam 100, and the distance measuring sensor 21 is mounted on the sensor mounting support 110 and is used for detecting the distance from obstacles around the rail beam 100 to the distance measuring sensor 21.

Through the technical scheme, when the rail clearance is measured, the cart main body 11 can be used as a carrier of the distance measuring sensor 21, so that when the cart main body 1 travels along the rail beam 100, the distance between an obstacle along the rail beam 100 and the distance measuring sensor 21 can be detected through the distance measuring sensor 21, and whether the obstacle invades into the clearance around the rail beam 100 or not can be judged through the measured distance. In addition, the cart main body 11 further has a guide wheel 40, the guide wheel 40 is in rolling contact with the side wall of the track beam 100, and in the traveling process of the track limit measuring instrument 1, the guide wheel 40 can play a role in guiding and limiting the traveling direction of the track limit measuring instrument 1, so that the track limit measuring instrument 1 is prevented from being displaced in the left-right direction, errors of data measured by the distance measuring sensor 21 due to the deviation of the track limit measuring instrument 1 are avoided, and the measuring accuracy of the track limit measuring instrument 1 is further improved.

It should be noted that the above mentioned obstacles around the track beam 100 may include an axle counter installed on the track beam 100, or devices beside the track beam 100 such as a transponder, a signal, a power box, an AP pole, a charging bow, or sundries such as surrounding buildings, scaffolds, platform doors, trees, etc. near the track beam 100.

In order to further improve the measuring effect of the rail-bound measuring instrument 1, the rail-bound measuring instrument 1 may include a plurality of distance measuring sensor groups 20, as shown in fig. 1, 3-4, and 6, each distance measuring sensor group 20 includes at least one distance measuring sensor 21, the sensor mounting bracket 110 extends in the up-down direction, and the plurality of distance measuring sensor groups 20 are arranged on the sensor mounting bracket 110 at intervals in the up-down direction. The plurality of distance measuring sensor groups 20 are arranged on the sensor mounting bracket 110 at intervals in the vertical direction, so that the distance measuring sensors 21 at different heights can measure obstacles at different heights on the periphery of the track beam 100, the radiating area of the track limit measuring instrument 1 in the measuring process is increased, the measuring deviation is reduced, and the measuring reliability is improved.

Alternatively, as shown in fig. 1 to 4 and 6, each ranging sensor group 20 may include two ranging sensors 21, and the two ranging sensors 21 in each ranging sensor group 20 may be arranged on the sensor mounting bracket 110 in the left-right direction. In this way, when the rail clearance measuring instrument 1 moves along the length direction of the rail beam 100, one ranging sensor 21 in each ranging sensor group 20 can measure the distance of the obstacle located in the left side area of the rail beam 100, and the other ranging sensor 21 in each ranging sensor group 20 can measure the distance of the obstacle located in the right side area of the high rail beam 100, so that the distance measuring operation of the obstacles on the left side and the right side of the rail beam 100 can be simultaneously realized during the travel of the clearance measuring instrument 1 along the rail beam 100, and the higher measuring efficiency is achieved.

In addition, the track beam 100 generally includes a first portion for supporting a left wheel of the track vehicle and a second portion for supporting a right wheel of the track vehicle, the first portion and the second portion being spaced apart from each other in a width direction of the track beam 100, in order to avoid interference between a chassis or the like of the track vehicle and an obstacle located between the first portion and the second portion during traveling, optionally, as shown in fig. 1 and 3 to 5, at least one ranging sensor group 20 of the plurality of ranging sensor groups 20 is disposed between the first portion of the track beam 100 for supporting the left wheel of the track vehicle and the second portion of the track beam 100 for supporting the right wheel of the track vehicle. In this way, during the travel of the rail-bound measuring instrument 1 on the rail beam 100, the distance-measuring sensor group 20 arranged between the first part and the second part can measure the obstacles in the first part and the second part, and the measuring dead angle is reduced.

Here, the obstacle between the first portion and the second portion may be, for example, an axle counting head which is mounted on an inner wall of the rail beam 100 through an axle counting mounting place on the rail beam 100, and in ranging of the axle counting head, the ranging sensor 21 located between the first portion and the second portion may be arranged flush with the position of the axle counting mounting place, that is, the sensing direction of the ranging sensor 21 located between the first portion and the second portion may be set in a horizontal direction.

In addition, at least one ranging sensor set 20 of the plurality of ranging sensor sets 20 may be disposed to be positioned above the track beam 100. This makes it possible to detect obstacles above the track beam 100, such as traffic signals, AP poles, platform doors, and power boxes.

When an obstacle such as a traffic signal or an AP pole located above the track beam 100 is located, since the height of the traffic signal or the AP pole is high, in order to facilitate distance measurement of the obstacle such as the traffic signal or the AP pole located at the high position, as shown in fig. 4, the distance measuring sensors 21 in at least one distance measuring sensor group 20 are disposed in an upward inclined manner at an angle, so that the sensing direction of the distance measuring sensors 21 forms an included angle with the horizontal direction. In this way, the distance of an obstacle located higher above the rail beam 100 can be detected without setting the sensor mounting bracket 110 large in size in the up-down direction.

Alternatively, the sensing direction of the ranging sensors 21 of the ranging sensor group 20 other than the ranging sensor group 20 disposed obliquely upward at an angle may be disposed parallel to the horizontal direction.

In a specific embodiment provided by the present disclosure, the number of the distance measuring sensor groups 20 is four, the upper distance measuring sensor group, the two middle distance measuring sensor groups, and the lower distance measuring sensor group are sequentially arranged along the direction from top to bottom, wherein the upper distance measuring sensor group includes two distance measuring sensors 21 respectively inclined upward, the two distance measuring sensors 21 are used for measuring the distance from the distance measuring sensors to obstacles such as a signal machine and an AP pole located above the track, the two middle distance measuring sensor groups are respectively used for measuring the distance from obstacles such as a platform door and a power supply box beside the track to the distance measuring sensors, the lower distance measuring sensor group is aligned with the installation position of the axle counting magnetic head installed on the side wall of the track beam 100, and is used for measuring the distance from the axle counting magnetic head to the distance measuring sensors 21.

Optionally, as shown in fig. 4 and 6, the rail-bound measuring instrument 1 further includes a mounting block 50 and a locking member, a sliding groove 1101 extending in the up-down direction is formed on the sensor mounting bracket 110, the mounting block 50 is slidably connected to the sliding groove 1101, the distance measuring sensor 21 is mounted on the mounting block 50, and the locking member is used for locking the mounting block 50 in the sliding groove 1101 in an unlocking manner. In this way, in the process of testing the rail clearance, the position of the distance measuring sensor 21 in the up-and-down direction can be adjusted by adjusting the position of the mounting block 50 on the sensor mounting bracket 110, so that the distance measuring sensor 21 can have a larger distance measuring range, and the measurement of obstacles with different heights can be realized.

As shown in fig. 6, the sliding groove 1101 is formed in a T-shape in the cross section of the sensor mounting bracket 110, so that the mounting block 50 is not easily separated from the sliding groove 1101 in the vertical sliding process.

In the embodiment in which the distance measuring sensors 21 in at least one distance measuring sensor group 20 are disposed to be inclined upward at an angle, the mounting blocks 50 may be formed with inclined mounting slopes in the left and right directions, respectively, and the distance measuring sensors 21 inclined upward at an angle may be mounted on the mounting slopes, respectively.

Of course, in other embodiments, the mounting block 50 may be directly provided with a mounting hole inclined upward, and the distance measuring sensor 21 may be inserted into the mounting hole, in short, the shape and mounting manner of the mounting block 50 are not limited in the present disclosure, as long as the corresponding effect can be achieved.

To facilitate locking of the mounting block 50, in one embodiment provided by the present disclosure, a slot extending in the up-down direction may be formed on the sensor mounting bracket 110, the slot communicates with the sliding groove 1101, the locking member includes a bolt 60, a threaded hole is formed on the mounting block 50, and the bolt 60 passes through the slot and is in threaded connection with the threaded hole. When the position of the mounting block 50 needs to be adjusted, the bolt 60 can be rotated to be separated from the threaded hole in the mounting block 50, relative sliding between the mounting block 50 and the sensor mounting bracket 110 can be achieved, at the moment, the mounting block 50 is adjusted to a proper position, then the bolt 60 sequentially penetrates through the long hole and the threaded hole to be fastened, and the mounting block 50 is locked on the sensor mounting bracket 110.

In other embodiments provided by the present disclosure, the sensor mounting bracket 110 may be formed with a plurality of screw holes spaced apart from each other in a vertical direction, each of the screw holes is respectively communicated with the sliding groove 1101, the mounting block 50 is formed with a screw hole, the bolt 60 passes through the screw holes and is screwed with the screw holes, and when the height of the distance measuring sensor needs to be adjusted, the bolt 60 may be fastened in the screw hole corresponding to the height.

In order to further improve the stability of the rail clearance measuring instrument 1 during the traveling process, optionally, as shown in fig. 1 to 3 and 5, two guide wheels 40 oppositely arranged in the left-right direction of the cart body 11 constitute a guide wheel set, and a plurality of guide wheel sets are arranged at intervals in the front-back direction of the cart body 11. Like this, at track clearance measuring apparatu 1 at the in-process of advancing, a plurality of guide wheelsets that the interval set up in the front and back direction respectively with the lateral wall of track roof beam 100 inconsistent to play the effect to track clearance measuring apparatu 1 direction and spacing, avoid this track clearance measuring apparatu 1 to take place the displacement in the direction of going left and right sides in the in-process of advancing, make this track clearance measuring apparatu 1 can move along orbital axis direction all the time, the distance information that records is also more true, effective.

As shown in fig. 1 to 3 and 5, the two traveling wheels 30 provided to face each other in the left-right direction of the cart body 11 form a traveling wheel group, and a plurality of traveling wheel groups are provided at intervals in the front-rear direction of the cart body 11. The plurality of traveling wheel sets arranged at intervals along the front-rear direction of the trolley body 11 can jointly support the trolley body 11, fluctuation of the track limit measuring instrument 1 in the up-down direction in the traveling process can be reduced, and stability of the track limit measuring instrument 1 in the traveling process is improved.

In one embodiment provided by the present disclosure, as shown in fig. 1-2, the number of the road wheels 30 may be four, and four road wheels 30 may be respectively installed on four corners of the cart main body 11, that is, a connection line between the four road wheels 30 is formed in a rectangular shape. Also, the number of the guide wheels 40 may be four, and four guide wheels 40 may be respectively installed on the sidewalls of the cart main body 11, that is, a line between the four guide wheels 40 is formed in a rectangular shape.

In order to facilitate the placement of the guide wheels 40 between the first and second portions of the rail beam 100, two guide wheels 40 disposed opposite to each other in the left-right direction are allowed to be in rolling contact with the side walls of the first and second portions, respectively, and optionally, the guide wheels 40 are detachably coupled with the cart main body 11. In the process of placing the rail clearance measuring instrument 1 between the two rail beams 100, the guide wheels 40 can be detached from the cart body 11, and after the rail clearance measuring instrument 1 is placed, the guide wheels 40 are installed on the cart body 11; in addition, when the guide wheels 40 are worn seriously or ranging is required for different kinds of track beams 100, it is also convenient to replace the guide wheels 40.

In one embodiment provided by the present disclosure, a threaded column is provided on the cart body 11, a threaded connection hole is provided on the rotation shaft of the guide wheel 40, the threaded connection hole is coaxially provided with the rotation shaft, and the threaded column is in threaded fit with the threaded connection hole. In another embodiment provided by the present disclosure, a locking groove may be formed on the cart body 11, and the rotating shaft of the guide wheel 40 may be interference-fitted with the locking groove. In summary, the present disclosure does not limit the connection manner between the cart body 11 and the guide wheel 40 as long as the detachable connection between the two can be realized.

Similarly, the road wheels 30 may be detachably connected to the cart body 11 for maintenance and replacement of the road wheels 30.

In order to facilitate the operator to push the cart body 11, as shown in fig. 1 to 3 and 5, a cart handle 80 is further provided on the cart body 11.

Optionally, the rail boundary measuring instrument 1 further comprises a controller and an alarm, the distance measuring sensor 21 and the alarm are both electrically connected with the controller, and the controller is used for controlling the alarm to give an alarm in case of determining that an obstacle exists in the boundary range of the rail beam 100 based on the distance measuring sensor 21. When the distance value measured by the distance measuring sensor 21 is smaller than the limit range value, the controller sends an alarm instruction to the alarm, the alarm gives an alarm, and at the moment, a measuring person pushing the track limit measuring instrument 1 to travel can know abnormality immediately, so that the obstacle in the limit range can be treated in time.

In addition, as shown in fig. 1-3 and 5, a storage battery 70 and a memory are further disposed on the cart body 11, the storage battery 70 is used for providing power for the controller, the alarm and the distance measuring sensor 21, the memory is used for storing distance information measured by the distance measuring sensor 21, and a data interface is further disposed on the memory, through which a measurer can derive the distance information measured by the distance measuring sensor 21, so as to facilitate subsequent analysis and calibration of the distance information.

Optionally, in this application, the rail clearance measuring instrument 1 may further include a counter, and the counter is installed on the traveling wheel 30 or the guide wheel 40 and is used for counting travel data of the traveling wheel 30 or the guide wheel 40 to obtain length information of the rail beam 100, so that the length of the rail beam 100 can be measured while the measuring person pushes the rail clearance measuring instrument 1 to measure the rail clearance.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims (10)

1. A track limit measuring instrument is characterized by comprising a trolley bracket (10), a traveling wheel (30), a guide wheel (40) and a distance measuring sensor (21), the cart support (10) comprises a cart main body (11) and a sensor mounting support (110) mounted on the cart main body (11), the two sides of the cart main body (11) opposite to each other along the left-right direction are respectively provided with the travelling wheels (30), the travelling wheels (30) are used for rolling contact with the top wall of the track beam (100), the two sides of the cart main body (11) opposite to each other along the left-right direction are respectively provided with the guide wheels (40), the guide wheels (40) are used for rolling contact with the side walls of the track beam (100), the ranging sensor (21) is mounted on the sensor mounting bracket (110), and is used for detecting the distance from the obstacles around the track beam (100) to the distance measuring sensor (21).

2. The rail-bound measuring instrument of claim 1, characterized in that the rail-bound measuring instrument (1) comprises a plurality of distance-measuring sensor groups (20), each distance-measuring sensor group (20) comprising at least one distance-measuring sensor (21), the sensor mounting bracket (110) extending in an up-down direction, a plurality of distance-measuring sensor groups (20) being arranged at intervals on the sensor mounting bracket (110) in the up-down direction.

3. The rail-bound measuring instrument according to claim 2, characterized in that each distance-measuring sensor group (20) comprises two distance-measuring sensors (21), the two distance-measuring sensors (21) of each distance-measuring sensor group (20) being arranged on the sensor mounting bracket (110) in the left-right direction.

4. The rail clearance gauge according to one of claims 2 or 3, wherein at least one of the ranging sensor groups (20) is arranged to be located between a first portion of the rail beam (100) for supporting a left wheel of a rail vehicle and a second portion of the rail beam (100) for supporting a right wheel of the rail vehicle, at least one of the ranging sensor groups (20) being arranged to be located above the rail beam (100).

5. The rail-bound measuring instrument according to one of claims 2 or 3, characterized in that the distance measuring sensors (21) of at least one distance measuring sensor group (20) are arranged at an angle inclined upwards, so that the sensing direction of the distance measuring sensors (21) is at an angle to the horizontal.

6. The rail-bound measuring instrument according to any one of claims 1 to 3, characterized in that the rail-bound measuring instrument (1) further comprises a mounting block (50) and a locking member, a slide groove (1101) extending in the up-down direction is formed on the sensor mounting bracket (110), the mounting block (50) is slidably connected to the slide groove (1101), the distance measuring sensor (21) is mounted on the mounting block (50), and the locking member is used for locking the mounting block (50) in the slide groove (1101) in an unlockable manner.

7. The rail clearance measuring instrument (1) of claim 6, wherein the sensor mounting bracket (110) is formed with a long hole extending in the up-down direction, the long hole communicating with the slide groove (1101), the locking member includes a bolt (60), the mounting block (50) is formed with a threaded hole, and the bolt (60) passes through the long hole and is threadedly coupled with the threaded hole.

8. The rail clearance measuring instrument according to any one of claims 1 to 3, wherein two guide wheels (40) oppositely disposed in the left-right direction of the truck main body (11) constitute a guide wheel group, and a plurality of the guide wheel groups are disposed at intervals in the front-rear direction of the truck main body (11);

the walking wheels (30) form walking wheel sets, and the walking wheel sets are arranged along the left and right directions of the trolley main body (11) at intervals.

9. The rail clearance measuring instrument according to claim 1, characterized in that the guide wheel (40) is detachably connected with the trolley body (11).

10. The rail boundary gauge according to one of claims 1 to 3, characterized in that the rail boundary gauge (1) further comprises a controller and an alarm, the distance measuring sensor (21) and the alarm being electrically connected to the controller, the controller being configured to control the alarm to alarm if it is determined, on the basis of the distance measuring sensor (21), that an obstacle is present within the boundary range of the rail beam (100).

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