Steel rail side surface straightness detection device

Abstract

The utility model provides a steel rail side surface straightness detection device, and belongs to the technical field of steel rail detection. In order to solve the problems of low detection efficiency and low detection precision caused by poor steel rail side surface flatness detection continuity, the utility model provides a steel rail side surface flatness detection device, which comprises a case, and the case is provided with a side surface detection mechanism; the side face detection mechanism comprises a side face displacement sensor, a detection assembly and two side edge row wheel sets. The detection assembly is movably arranged on the side edge of the machine box and used for abutting against the side face of the steel rail, and the detection assembly extends into the machine box. The side displacement sensor is arranged in the case and horizontally faces the detection assembly so as to obtain steel rail side data by detecting the displacement of the detection assembly; the side row wheel sets have the first length, and the two side row wheel sets are arranged on the side edges of the two ends of the machine box respectively and used for making contact with the side face of the steel rail. According to the invention, continuous detection of the straightness of the side surface of the steel rail is realized, and the detection efficiency and the detection accuracy are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rail detection, in particular to a rail side flatness detection device. BACKGROUND

[0002] Rail flatness refers to the deviation of the working plane (including the top surface and the inner side surface) of the rail from the measurement reference plane, and is a basic index of high-speed railway rails. Its significance lies in minimizing train vibration and reducing wheel-rail wear to provide safety and comfort for train passengers. According to the railway industry standard TB / T2344.1-2020, the flatness requirements in the horizontal direction (i.e., the top surface) and the vertical direction (i.e., the inner side surface, usually the detection position is located at 16±0.2mm below the rail top) are proposed for the rail ends 0m-1.5m and 1m-2.5m as well as the rail body.

[0003] Currently, for rail side flatness detection, a non-contact sensor such as a laser displacement sensor is usually used, i.e., a laser displacement sensor is arranged in the horizontal direction of the rail side to directly irradiate the rail side at a horizontal irradiation angle. However, due to the presence of rail guards in some sections of the rail, the rail guards are generally located at 42mm from the working side of the rail, occupying the installation position of the side laser displacement sensor, resulting in the inability to directly install the laser displacement sensor on the rail side.

[0004] To solve this problem, currently, a sectional detection is usually used, i.e., a laser displacement sensor is used in the conventional section, and a ruler is used for manual detection in the guard section. The rail side flatness cannot be continuously detected, resulting in low detection efficiency and detection accuracy. CONTENT OF THE INVENTION

[0005] The present application aims to solve the problem of poor continuity of rail side flatness detection in the prior art, resulting in low detection efficiency and detection accuracy. Therefore, the present application provides a rail side flatness detection device, which provides a reference for side detection through the side edge wheel set, and indirectly and continuously detects the rail side through the cooperation of the side displacement sensor and the detection assembly, thereby realizing continuous detection of the rail side flatness and improving the detection efficiency and detection accuracy.

[0006] The present application provides a rail side flatness detection device, which comprises a case, the case is provided with a side detection mechanism, the side detection mechanism comprises a side displacement sensor, a detection assembly and two side edge wheel sets;

[0007] The detection assembly is movably arranged on the side of the case and used for abutting against the rail side, and the detection assembly extends into the case;

[0008] The side displacement sensor is arranged in the case and horizontally faces the detection assembly to obtain the rail side data by detecting the displacement of the detection assembly.

[0009] The side edge wheel set has a first length, and the two side edge wheel sets are arranged at the two end sides of the case and used for contacting the rail side.

[0010] By using the above technical scheme, the dynamic reference chord of the rail side is provided by the side edge wheel set, so that the reference chord of the displacement value measured by the side displacement sensor can always be located on the top of the wave crest surface, and the detection accuracy of the flatness of the rail side is improved. In addition, since the detection assembly only needs to abut against the rail side, the volume of the detection assembly can be small, so that the guard rail section can be passed, and the detection surface is converted to the upper side of the rail side by the detection assembly, so that the rail side can be detected by the side displacement sensor through the detection assembly. Therefore, the continuous detection of the flatness of the rail in each section can be realized, the detection efficiency is improved, and the detection data of different sections does not need to be spliced, so that the detection accuracy is further improved. In addition, the side detection mechanism can be arranged close to the rail through the case, so that the detection accuracy of the side detection mechanism is further improved.

[0011] In some embodiments, the side edge wheel set includes a plurality of side edge wheels arranged in sequence along a first direction, and the side edge wheels are used for contacting and rolling along the rail side.

[0012] In some embodiments, the detection assembly includes a detection plate for the side displacement sensor to detect, a detection wheel connected with the detection plate and moving synchronously, and an elastic member. The detection plate is slidingly connected with the case, and the elastic member is arranged between the detection plate and the case. The elastic member is used for ensuring that the detection wheel connected with the detection plate abuts against the rail side along the sliding direction.

[0013] By using the above technical scheme, the contact area with the rail side can be reduced by abutting the detection wheel against the rail side, so that the detection accuracy of the flatness of the rail side is improved. In addition, the rolling friction can reduce the resistance of the detection instrument relative to the rail, so that the moving stability is improved, and the detection accuracy is further improved.

[0014] In some embodiments, the detection wheel is a bearing.

[0015] In some embodiments, the detection plate includes two extension arms arranged symmetrically and penetrating through the bottom of the case. The two ends of the two extension arms are respectively provided with a connecting portion and a blocking portion. The blocking portion is located in the case and is used for cooperating with the side displacement sensor to realize detection. The top of the connecting portion is slidingly connected with the bottom of the case, and the detection wheel and the elastic member are connected with the connecting portion.

[0016] The technical scheme is adopted, the extension arms are symmetrically arranged to connect the connecting portion and the blocking portion, the weight of the detection plate is reduced, the reliability of synchronous movement of the blocking portion and the connecting portion is ensured, and the detection accuracy is ensured.

[0017] In some embodiments, the connecting portion comprises a limiting cavity, one end of the elastic member is sleeved on a guide column arranged on the cabinet, and the other end is arranged in the limiting cavity.

[0018] The technical scheme is adopted, the guide column and the limiting cavity are matched, the stability of the deformation path of the elastic member is improved, the movement stability of the detection plate is improved, and the detection accuracy is improved; and the limiting cavity is arranged, the length of the elastic member is ensured, the volume of the detection assembly is controlled, and the guard rail section is suitable.

[0019] In some embodiments, the cabinet and the end of the connecting rod are detachably connected.

[0020] The connecting rod can be axially extended and retracted to adapt to steel rails with different track gauges, and the cabinet is located directly above the steel rail.

[0021] The cabinet is also provided with a moving mechanism, the moving mechanism comprises traveling wheels, two extension frames symmetrically arranged, and guide wheels arranged on the side edges of the extension frames, the traveling wheels are arranged below the cabinet and are used to travel on the top surface of the steel rail, the two extension frames are symmetrically arranged at the two ends of the cabinet, and the guide wheels are used to abut against the inner side surface of the steel rail.

[0022] The technical scheme is adopted, the connecting rod and the moving mechanism are arranged, the device is directly used, and the detection convenience is improved.

[0023] In some embodiments, the side edge row wheel set comprises a first side edge row wheel set and a second side edge row wheel set, and the guide wheel is located between the first side edge row wheel set and the second side edge row wheel set.

[0024] In some embodiments, the cabinet comprises a main cabinet and a secondary cabinet which are detachably connected, the lower portion of the secondary cabinet is provided with a mounting frame, and the two ends of the mounting frame extend extension wings.

[0025] The main cabinet is connected with the connecting rod, and the extension frame is connected with the main cabinet.

[0026] The secondary cabinet is arranged in the middle lower portion of the main cabinet, the side displacement sensor is arranged in the secondary cabinet, the detection assembly is movably arranged on the mounting frame, and the side edge row wheel set is arranged on the side edge of the extension wing away from the connecting rod and is connected with the extension frame.

[0027] By adopting the technical scheme, the side detection mechanism is installed on the side of the auxiliary machine box, and the auxiliary machine box is detachably arranged in the lower part of the main machine box, so that the side detection mechanism can be integrally detached, and the weight balance of the two ends of the main machine box is not affected, thereby improving the use flexibility of the device.

[0028] Other features and corresponding advantages of the present application are described in the latter part of the specification, and it should be understood that at least part of the advantages are obvious from the description in the specification. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a schematic diagram of the steel rail flatness detection range;

[0030] Figure 2 It is a structural schematic diagram of the present application;

[0031] Figure 3 It is a partial structural schematic diagram of the present application;

[0032] Figure 4 It is a partial bottom view structural schematic diagram of the present application;

[0033] Figure 5 It is a partial structural schematic diagram of the side detection mechanism of the present application;

[0034] Figure 6 It is a partial sectional view structural schematic diagram of the side detection mechanism of the present application.

[0035] BRIEF DESCRIPTION OF DRAWINGS

[0036] 100, machine box; 110, main machine box; 111, extension frame; 120, auxiliary machine box; 121, mounting frame; 122, extension wing;

[0037] 210, top surface displacement sensor; 220, horizontal row wheel set; 221, horizontal wheel;

[0038] 310, side displacement sensor; 320, detection plate; 321, extension arm; 322, blocking part; 323, connecting part; 330, detection wheel; 331, mounting seat; 340, elastic member; 341, limiting cavity; 342, guide column; 350, side edge row wheel set; 351, side edge wheel;

[0039] 410, walking wheel; 420, guide wheel;

[0040] 500, connecting rod;

[0041] 600, push rod. DETAILED DESCRIPTION

[0042] The present application will be described with reference to particular embodiments of the application and procedures for testing the flatness of a rail. Other advantages and benefits of the present application will become apparent to those of ordinary skill in the art upon reading and understanding the following detailed description of the application. While the description will focus on preferred embodiments, it is to be understood that the application is not limited to the embodiments. Rather, the embodiments are presented by way of example to cover any alternatives or modifications that fall within the scope of the claims based on the present application. Numerous specific details of the application are described below in order to provide a thorough understanding of the present application. The present application can be practiced without these details. In addition, well-known methods, procedures, components, and circuits have not been described in detail so as not to obscure pertinent aspects of the application. Further, some of the details have been omitted in order to avoid obscuring the application. It is to be understood that the embodiments and features of the application can be combined with each other, where such combinations do not conflict.

[0043] It should be noted that in the description of the present application, similar reference numerals and letters in the accompanying drawings represent similar items, and thus, once an item is defined in one drawing, it is not necessary to further define and explain it in subsequent drawings.

[0044] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are merely for the convenience of describing the present application and simplifying the description, and thus, cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features, and thus, the features limited by "first", "second", and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more. Unless otherwise specified and limited, the terms "mounting", "connection", and "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between the two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] Please refer to Figure 1 , Figure 1 The figure shows the range of rail flatness detection.

[0046] Rail flatness refers to the deviation of the working plane of the rail from the measurement reference plane, that is, the values of a and b, the smaller the deviation, the smaller the vibration of the train running on the rail.

[0047] Currently, two non-contact sensors, such as laser displacement sensors, are commonly used to irradiate the working plane of the steel rail vertically to obtain corresponding data. However, the current sensor size is usually greater than 42 mm, while the standard interval between the steel rail and the guard rail in the guard rail section is 42 mm, which results in that the sensor cannot be installed on the side edge of the steel rail in this section.

[0048] Please refer to Figure 2 , Figure 2 is a structural schematic diagram of the present application.

[0049] The embodiment of the present application provides a steel rail side flatness detection device, which comprises a case 100, and the case 100 is provided with a side surface detection mechanism, and the side surface flatness detection of the steel rail is realized through the side surface detection mechanism.

[0050] In one embodiment, the case 100 is also provided with a top surface detection mechanism, and the top surface flatness detection of the steel rail is realized through the top surface detection mechanism, and the side surface detection mechanism is used to realize the double-side flatness detection of the steel rail.

[0051] In one embodiment, the device further comprises a connecting rod 500, and the case 100 and the end of the connecting rod 500 are detachably connected, so that the case 100 and the connecting rod 500 are convenient to disassemble and assemble, thereby facilitating transportation and carrying.

[0052] The other end of the connecting rod 500 can be provided with a lap joint piece, so that the case 100 and the lap joint piece are matched and placed on the left and right steel rails to form an integral whole, and the stability of the case 100 in the detection process is improved. At the same time, the connecting rod 500 can also be connected with an operating device, such as a push rod 600, to realize the continuous and stable movement of the case 100 on the steel rail, and improve the detection convenience.

[0053] The lap joint piece is preferably the case 100, that is, two cases 100 are symmetrically arranged on the connecting rod 500 to realize the detection of the left and right steel rails, respectively.

[0054] Preferably, the connecting rod 500 can be axially telescopic to adapt to steel rails with different track gauges and make the case 100 located directly above the steel rail, thereby improving the detection accuracy.

[0055] In one specific embodiment, the connecting rod 500 is internally provided with a gas spring to realize self-adaptation to steel rails with different track gauges.

[0056] Please refer to Figures 3-4 , Figure 3 is a partial structural schematic diagram of the present application; Figure 4 is a partial bottom view structural schematic diagram of the present application, in which part of the case 100, i.e., the auxiliary case 120, is removed.

[0057] In one embodiment, the side surface detection mechanism comprises a side surface displacement sensor 310, a detection assembly and two side edge row wheel groups 350.

[0058] The detection assembly is arranged at the side of the case 100 and used to abut against the side surface of the rail, and the detection assembly extends into the case 100.

[0059] The side displacement sensor 310 is arranged in the case 100 and horizontally faces the detection assembly to obtain the side surface data of the rail by detecting the displacement of the detection assembly.

[0060] The side edge row wheel set 350 has a first length, and two side edge row wheel sets 350 are arranged at the two end sides of the case 100 and used to contact the side surface of the rail, so as to provide a dynamic reference chord of the side surface for the side flatness detection, and ensure that the reference chord of the displacement value measured by the side displacement sensor 310 can always be located at the top of the wave crest (the working surface of the rail is usually concave due to wear), thereby improving the detection accuracy of the rail flatness.

[0061] In one embodiment, the top surface detection mechanism includes a top surface displacement sensor 210 and two horizontal row wheel sets 220 arranged at the two ends thereof.

[0062] The top surface displacement sensor 210 is arranged in the case 100 and vertically faces the bottom surface of the case 100 to obtain the top surface data of the rail.

[0063] The horizontal row wheel set 220 has a second length, and two horizontal row wheel sets 220 are arranged at the two ends of the case 100 and used to contact the top surface of the rail, so as to provide a dynamic reference chord of the top surface of the rail for the top flatness detection, and ensure that the reference chord of the displacement value measured by the top surface displacement sensor 210 can always be located at the top of the wave crest (the working surface of the rail is usually concave due to wear), thereby improving the detection accuracy of the rail flatness.

[0064] The top surface displacement sensor 210 and the side displacement sensor 310 can be but are not limited to contact sensors and non-contact sensors, and preferably are non-contact sensors such as laser displacement sensors.

[0065] It should be noted that the first length and the second length can be the same or different, the range of the side dynamic reference chord is related to the first length, and the range of the top dynamic reference chord is related to the second length. Preferably, the first length and the second length are the same, so that the ranges of the two dynamic reference chords are the same, which is convenient for subsequent data analysis.

[0066] Preferably, the front and rear side edge row wheel sets 350 are combined with the case 100 to form a length of about 1 m, so that the range of the dynamic reference chord is about 1 m, which is suitable for most detection situations.

[0067] It should be noted that, since the detection assembly only needs to abut against the side surface of the rail, the volume thereof can be set smaller, so that the detection assembly can be passed through the guard rail section, and at the same time, the detection surface of the detection assembly is converted to above the side surface of the rail, so that the side displacement sensor 310 can detect the side surface of the rail through the detection assembly, the continuous detection of the flatness of each section of the rail can be realized, the detection efficiency is improved, and the detection data of different sections does not need to be spliced, and the detection accuracy is further improved.

[0068] In addition, by integrating the top surface detection mechanism and the side surface detection mechanism in the case 100, the synchronous detection of both sides of the rail can be facilitated, the wiring is more concentrated, and in particular, the influence of the gauge change on the side flatness detection can be avoided. Moreover, the side surface detection mechanism can be arranged as close to the rail as possible in the height direction through the case 100, so that the detection accuracy of the side surface detection mechanism can be further improved.

[0069] In one embodiment, the side edge row wheel set 350 includes a plurality of side edge wheels 351 arranged in sequence along the first direction, and the side edge wheels 351 are used to contact and roll along the side surface of the rail.

[0070] In one embodiment, the horizontal row wheel set 220 includes a plurality of horizontal wheels 221 arranged in sequence along the first direction, and the horizontal wheels 221 are used to contact and roll along the top surface of the rail.

[0071] It can be understood that, when the device is used, the first direction is the same as the extension direction of the rail.

[0072] In one embodiment, the case 100 is further provided with a moving mechanism, so that the device can directly walk on the rail, continuous detection can be performed, and the detection convenience is improved.

[0073] The moving mechanism includes a walking wheel 410, two extension frames 111 symmetrically arranged, and a guide wheel 420 arranged on the side of the extension frame 111. The walking wheel 410 is arranged below the case 100 and is used to walk on the top surface of the rail, the two extension frames 111 are symmetrically arranged at the two ends of the case 100, and the guide wheel 420 is used to abut against the inner side surface of the rail.

[0074] Preferably, the top surface displacement sensor 210, the side surface displacement sensor 310, and the walking wheel 410 are arranged in sequence along the first direction, and the side surface displacement sensor 310 is located in the middle of the case 100.

[0075] In one embodiment, the side edge row wheel set 350 includes a first side edge row wheel set 350 and a second side edge row wheel set 350, and the guide wheel 420 is located between the first side edge row wheel set 350 and the second side edge row wheel set 350.

[0076] Please refer to Figures 5-6 , Figure 5 is a partial structure schematic view of the side surface detection mechanism of the present application.Figure 6 Partially cutaway structural schematic diagram of side detection mechanism of the present application.

[0077] In one embodiment, the detection assembly comprises a detection plate 320 for detection by the side displacement sensor 310, a detection wheel 330 connected with the detection plate 320 and moving synchronously, and an elastic member 340.

[0078] The detection plate 320 is slidingly connected with the case 100, and an elastic member 340 is arranged between the detection plate 320 and the case 100, which is used to ensure that the detection wheel 330 connected with the detection plate 320 abuts against the side of the rail along the sliding direction.

[0079] In this way, the detection wheel 330 abuts against the side of the rail, which can reduce the contact area with the side of the rail, thereby improving the detection accuracy of the side flatness. At the same time, the rolling friction can reduce the resistance of the detector moving relative to the rail, improve the moving stability, and further improve the detection accuracy.

[0080] It should be noted that, in order to realize the rolling of the detection wheel 330, the detection wheel 330 is connected with the detection plate 320 through a mounting seat 331.

[0081] Preferably, the detection wheel 330 is a bearing.

[0082] In one embodiment, the detection plate 320 comprises two extension arms 321 arranged symmetrically and penetrating through the bottom of the case 100, and the two ends of the two extension arms 321 are respectively provided with a connecting portion 323 and a blocking portion 322.

[0083] The blocking portion 322 is located in the case 100 and is used to cooperate with the side displacement sensor 310 to realize detection. The connecting portion 323 is slidingly connected with the bottom of the case 100, and the detection wheel 330 and the elastic member 340 are both connected with the connecting portion 323.

[0084] In this way, the connecting portion 323 and the blocking portion 322 are connected through the symmetrically arranged extension arms 321, which not only reduces the weight of the detection plate 320, but also ensures the reliability of synchronous movement of the blocking portion 322 and the connecting portion 323, thereby ensuring the detection accuracy.

[0085] In one embodiment, the connecting portion 323 comprises a limiting cavity 341, one end of the elastic member 340 is sleeved on a guide column 342 arranged on the case 100, and the other end is arranged in the limiting cavity 341. Through the cooperation of the guide column 342 and the limiting cavity 341, the stability of the deformation path of the elastic member 340 is improved, thereby improving the moving stability of the detection plate 320 and further improving the detection accuracy. Moreover, through the arrangement of the limiting cavity 341, the length of the elastic member 340 can be ensured while the volume of the detection assembly is controlled, thereby being suitable for passing through the guard rail section.

[0086] In one embodiment, the machine case 100 comprises a main machine case 110 and a sub-machine case 120 connected detachably. The sub-machine case 120 is provided with a mounting rack 121, and the mounting rack 121 is extended with extension wings 122 at both ends.

[0087] The main machine case 110 is connected with the connecting rod 500, and the top surface displacement sensor 210 is arranged in the main machine case 110. The extension rack 111 is connected with the main machine case 110, and the horizontal row wheel group 220 is arranged below the extension rack 111.

[0088] The sub-machine case 120 is arranged at the middle lower part of the main machine case 110, and the side surface displacement sensor 310 is arranged in the sub-machine case 120. The detection assembly is movably arranged on the mounting rack 121, and the side edge row wheel group 350 is arranged at the side edge away from the connecting rod 500 of the extension wing 122, and the side edge row wheel group 350 is also connected with the extension rack 111.

[0089] In this way, the side surface detection mechanism is arranged through the sub-machine case 120, and the sub-machine case 120 is arranged detachably at the middle lower part of the main machine case 110, so that the side surface detection mechanism can be disassembled integrally, and the weight balance at both ends of the main machine case 110 is not affected, that is, the separate use of the top surface detection mechanism is not affected, thereby improving the use flexibility of the device.

[0090] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A rail side flatness detection device characterized by, The device comprises a case, which is provided with a side detection mechanism, the side detection mechanism comprising a side displacement sensor, a detection assembly and two side edge wheel groups; The detection assembly is movably arranged on the side of the case and used for abutting against the side of the rail, and the detection assembly extends into the case; The side displacement sensor is arranged in the case and horizontally faces the detection assembly, so as to obtain the side data of the rail by detecting the displacement of the detection assembly; The side edge wheel groups have a first length, and the two side edge wheel groups are arranged on the two end sides of the case and used for contacting the side of the rail.

2. The rail side flatness detection device according to claim 1, characterized by The side edge wheel group comprises a plurality of side edge wheels arranged in sequence in a first direction, and the side edge wheels are used for contacting and rolling along the side of the rail.

3. The rail side flatness detection device according to claim 1, characterized by The detection assembly comprises a detection plate for the side displacement sensor to detect, a detection wheel connected with the detection plate and moving synchronously, and an elastic member, the detection plate is slidably connected with the case, and the elastic member is arranged between the detection plate and the case, and the elastic member is used for ensuring that the detection wheel connected with the detection plate abuts against the side of the rail in the sliding direction.

4. The rail side flatness detection device according to claim 3, characterized by The detection wheel is a bearing.

5. The rail side flatness detection device according to claim 3, characterized by The detection plate comprises two extension arms arranged symmetrically and penetrating through the bottom of the case, two ends of the two extension arms are respectively provided with a connecting portion and a blocking portion, the blocking portion is located in the case and used for cooperating with the side displacement sensor to realize detection, the connecting portion is slidably connected with the bottom of the case, and the detection wheel and the elastic member are connected with the connecting portion.

6. The rail side flatness detection device according to claim 5, characterized by The connecting portion comprises a limiting cavity, one end of the elastic member is sleeved on a guide column arranged on the case, and the other end is arranged in the limiting cavity.

7. The rail side flatness detection device according to claim 1, characterized by Further comprising a connecting rod, the case and the end of the connecting rod are detachably connected; The connecting rod can be axially extended and retracted to adapt to rails with different gauges and make the case located above the rail; The case is further provided with a moving mechanism, the moving mechanism comprising a walking wheel, two extension frames arranged symmetrically and guide wheels arranged on the side of the extension frames, the walking wheel is arranged below the case and used for walking on the top surface of the rail, the two extension frames are arranged symmetrically on the two ends of the case, and the guide wheels are used for abutting against the inner side of the rail.

8. The rail side flatness detection device according to claim 7, characterized by The side edge wheel group comprises a first side edge wheel group and a second side edge wheel group, and the guide wheels are located between the first side edge wheel group and the second side edge wheel group.

9. The rail side flatness detection device according to claim 7, wherein The case comprises a main case and a secondary case which are detachably connected, the lower portion of the secondary case is provided with a mounting frame, and the two ends of the mounting frame extend with extension wings; The main case is connected with the connecting rod, and the extension frame is connected with the main case; The secondary case is arranged at the middle lower portion of the main case, the side displacement sensor is arranged in the secondary case, the detection assembly is movably arranged on the mounting frame, and the side edge wheel group is arranged on the side of the extension wing away from the connecting rod and further connected with the extension frame.

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