Efficient steel rail profile measuring instrument assembling mechanism

Abstract

The utility model discloses an efficient steel rail profile measuring instrument assembling mechanism which comprises a positioning base and a pressing rotating shaft. The upper surface of the positioning base is provided with a positioning groove, and the bottom surface of the positioning groove is provided with a groove for mounting a knuckle bearing mounting seat of the steel rail profile measuring instrument host. A pressing rotating shaft through hole is formed in the side part of the positioning base; two ends of the through hole are respectively communicated with the rear side surface of the positioning base and the interior of the positioning groove; a magnet mounting groove is formed in the bottom of the positioning base, and a magnet is fixed in the magnet mounting groove. The pressing rotating shaft is coaxially inserted into the pressing rotating shaft through hole and is in clearance fit with the pressing rotating shaft through hole through a designed through hole matching section; meanwhile, the designed tensioning force applying section is connected with a knuckle bearing hole in a knuckle bearing mounting seat at the bottom of the steel rail profile measuring instrument host in the positioning groove in an inserted mode, and the steel rail profile measuring instrument host can be locked by rotating and pressing the rotating shaft. According to the utility model, rapid assembly and accurate measurement of the steel rail profile measuring instrument can be efficiently realized.

Description

Technical Field

[0001] The utility model belongs to the field of railway testing and relates to an assembly mechanism of an efficient rail profile measuring instrument. Background Technique

[0002] As an important transportation infrastructure, the railway has strict requirements for the safety, comfort and running stability of train operation. Among them, the abnormal wear of the rail head will bring huge potential safety hazards to train operation. To ensure the safe and stable operation of railway transportation, it is extremely important to collect the rail head profile data in time and make reasonable repairs to the rail.

[0003] By collecting the profile data of the rail head through a high-precision measuring instrument, accurate cross-sectional information can be obtained. Based on the profile data, a grinding plan for a specific rail can be formulated. Through targeted grinding, the unevenness of the rail surface can be reduced, and the driving comfort can be improved. At the same time, regularly collecting the rail head profile data and implementing rail grinding can reduce the wear of the rail and extend its service life. Reasonable grinding can avoid excessive wear of the rail, thereby reducing the replacement cost.

[0004] At present, most rail profile measuring instruments are "split type". During measurement, on-site assembly is required, and the assembly accuracy will directly affect the measurement accuracy of the rail profile measuring instrument. A stable and reliable assembly mechanism during assembly can reduce measurement errors and improve measurement accuracy. The traditional assembly mechanism is usually a screw-locking method. This assembly method has a long assembly time and low assembly accuracy, seriously affecting the measurement accuracy of the rail profile measuring instrument.

[0005] Therefore, a fast and accurate assembly mechanism is needed to improve the assembly accuracy and efficiency of the rail profile measuring instrument. Content of the Utility Model

[0006] Aiming at the above deficiencies existing in the prior art, in order to be able to assemble the rail profile measuring instrument quickly and efficiently and provide strong support for the efficiency and accuracy of collecting the rail profile, the utility model proposes an assembly mechanism of an efficient rail profile measuring instrument, which can effectively improve the assembly efficiency and accuracy of the rail profile measuring instrument.

[0007] The assembly mechanism of the efficient rail profile measuring instrument of the utility model includes a positioning base and a pressing rotating shaft.

[0008] A positioning groove is formed on the upper surface of the positioning base, and a recess is formed in the middle of the bottom surface of the positioning groove, so that the overall shape matches the shape of the joint bearing mounting seat of the main body of the rail profile measuring instrument, and the two are inserted and matched. A sealing cover is installed at the positioning groove to seal the inside of the positioning groove; a protruding part is provided in the middle of the bottom surface of the sealing cover; the protruding part is matched with the recess on the bottom surface of the positioning groove and inserted into the recess; a hole is formed on the protruding part and is matched with a ball plunger screw installed in the hole on the upper top surface of the positioning base for positioning;

[0009] A pressing rotating shaft through hole is formed on the side of the positioning base. The two ends of the pressing rotating shaft through hole are respectively communicated with the rear side surface of the positioning base and the inside of the positioning groove, and are coaxial with the bearing hole of the joint bearing in the joint bearing mounting seat installed at the bottom of the main body of the rail profile measuring instrument inserted into the positioning groove.

[0010] A magnet mounting groove is formed at the bottom of the positioning base, and a magnet is fixed inside to adsorb the rail and fix the positioning base.

[0011] The pressing rotating shaft is respectively a tension application section, a through hole matching section, a stroke limit matching section and a handle mounting section from back to front. Among them, the through hole matching section, the formation limit matching section and the handle mounting section are coaxial, and the cross-sectional diameter of the through hole matching section is larger than the cross-sectional diameter of the tension application section, equal to the inner diameter of the bearing hole of the joint bearing in the joint bearing mounting seat at the bottom of the main body of the rail profile measuring instrument, and the axis is parallel but not coincident with the axis of the through hole matching section.

[0012] The above-mentioned pressing rotating shaft is coaxially inserted into the pressing rotating shaft through hole, and there is a clearance fit between the through hole matching section and the pressing rotating shaft through hole. Rotating the pressing rotating shaft realizes the locking of the main body of the rail profile measuring instrument; at the same time, a pressing rotating shaft stroke limit hole is formed on the top surface of the positioning base, and a limit screw is installed in the hole by screw thread fit. The end of the limit screw is screwed between the through hole matching section and the handle mounting section to limit the axial displacement of the pressing rotating shaft.

[0013] Thus, after the rail profile measuring instrument is installed in the positioning groove, by pushing the pressing rotating shaft, the tension application section passes through the joint bearing in the joint bearing mounting seat of the main body of the rail profile measuring instrument; then rotate the pressing rotating shaft to drive the pressing rotating shaft to rotate. At this time, the pressing rotating shaft will rotate around the axis of the through hole matching section, so that the tension application section will apply a radial pressing force to the joint bearing during the rotation of the pressing rotating shaft, thereby pressing the joint bearing seat and further fixing the rail profile measuring instrument.

[0014] Place the positioning base assembled with the rail profile measuring instrument as described above on the top of one side rail, connect one end of the telescopic rod of the rail profile measuring instrument to the positioning base, and place the other end on the top of the other side rail, ensuring that the positioning base and the contact ends of the telescopic rod with the rail are on the same horizontal plane, and then the equipment can be operated to complete data collection.

[0015] The advantages of the present utility model are:

[0016] 1. The assembly mechanism of the high-efficiency rail profile measuring instrument of the present utility model realizes assembly positioning through surface contact with the rail profile measuring instrument, and has high assembly accuracy. When the rail profile measuring instrument needs to be assembled and measured, positioning is achieved through the contact of two planes, so that a large contact area can be obtained, and high positioning accuracy can be achieved.

[0017] 2. The assembly mechanism of the high-efficiency rail profile measuring instrument of the present utility model is locked through a spherical plain bearing, with fast locking speed and large locking force. By pressing the rotating shaft to drive the spherical plain bearing to rotate, the pressing rotating shaft is bent under the drive of the spherical plain bearing, and a pulling force is applied to the main body of the rail profile measuring instrument, so as to lock the main body of the rail profile measuring instrument and the measuring base. At the same time, a special structure of the pressing rotating shaft is designed, and a simple hexagon socket screw is installed in the through hole to realize the function of restricting the stroke of the pressing rotating shaft.

[0018] 3. The assembly mechanism of the high-efficiency rail profile measuring instrument of the present utility model can quickly fix the assembled rail profile measuring instrument on the rail. By installing a magnet at the bottom end of the positioning base, the assembled rail profile measuring instrument can be quickly adsorbed on the rail, playing a role in positioning the rail profile measuring instrument, so as to realize the rapid and efficient acquisition of rail head profile data. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the upper part of the overall structure of the assembly mechanism of the high-efficiency rail profile measuring instrument of the present utility model;

[0020] Figure 2 It is a schematic diagram of the lower part of the overall structure of the assembly mechanism of the high-efficiency rail profile measuring instrument of the present utility model;

[0021] Figure 3 It is a schematic diagram of the structure of the pressing rotating shaft in the assembly mechanism of the high-efficiency rail profile measuring instrument of the present utility model;

[0022] Figure 4 It is a schematic diagram of the structure of the rotating shaft handle in the assembly mechanism of the high-efficiency rail profile measuring instrument of the present utility model;

[0023] Figure 5 It is a schematic diagram of the structure of the positioning groove cover in the assembly mechanism of the high-efficiency rail profile measuring instrument of the present utility model.

[0024] In the figure:

[0025] 1 - Rotating shaft handle 2 - Pressing rotating shaft 3 - Positioning groove cover

[0026] 4 - Positioning base 5 - Base magnet 6 - Telescopic rod of rail profile measuring instrument

[0027] 7 - Connecting plate 101 - Threaded hole for handle adsorption 102 - Threaded hole on the right side of the handle

[0028] 103 - Left - threaded hole of the handle 201 - Tension - applying section 202 - Through - hole mating section

[0029] 203 - Stroke - limiting mating section 204 - Handle mounting section 301 - Sealing cover

[0030] 302 - Protruding part 303 - Through - hole of the positioning - groove cover 304 - Annular groove

[0031] 401 - Positioning groove 402 - Stroke - limiting hole of the pressing rotating shaft 403 - Side - part magnet mounting hole

[0032] 404 - Through - hole of the pressing rotating shaft 405 - Placing hole of the positioning - groove cover 406 - Limiting hole of the positioning - groove cover

[0033] 407 - Positioning strip 408 - Bottom - part magnet mounting groove Detailed implementation manners

[0034] The present utility model will be further described below in conjunction with the attached drawings.

[0035] The assembly mechanism of the high - efficiency rail profile measuring instrument of the present utility model includes a rotating - shaft handle 1, a pressing rotating shaft 2, a positioning - groove cover 3 and a positioning base 4, as Figure 1 、 Figure 2 shown.

[0036] The positioning base 4 is a box - body structure with a rectangular cross - section. The positioning base 4 is designed with a positioning groove 401, a stroke - limiting hole 402 of the pressing rotating shaft, a magnet mounting hole 403, a through - hole 404 of the pressing rotating shaft, a placing hole 405 of the positioning - groove cover, a limiting hole 406 of the positioning - groove cover, a positioning strip 407 and a bottom - part magnet mounting groove 408.

[0037] Among them, the positioning groove 401 is opened on the front side of the top surface of the positioning base 4, and is a rectangular groove along the left - right direction of the positioning base 4. At the same time, the middle part of the bottom surface of the positioning groove 401 has a central groove, forming an overall T - shaped groove structure, and its size matches the size of the joint - bearing mounting seat of the rail profile measuring instrument main body. The joint - bearing mounting seat of the rail profile measuring instrument main body is inserted into the positioning groove 401, and at the same time, the bottom surface of the rail profile measuring instrument main body is in contact with the upper surface of the positioning base 4, realizing the positioning between the rail profile measuring instrument main body and the positioning base 4.

[0038] The axis of the through - hole 404 of the pressing rotating shaft is designed along the front - back direction of the positioning base 4, and the two ends are respectively communicated with the rear side surface of the positioning base 4 and the inside of the positioning groove 401, and is used for installing the pressing rotating shaft 2.

[0039] The pressing rotation shaft stroke limiting hole 402 is a threaded hole, designed in the vertical direction, located directly above the through hole 404 of the pressing rotation shaft, near the rear side of the positioning base 4; both ends of the pressing rotation shaft stroke limiting hole 402 are respectively connected to the top surface of the positioning base 4 and the through hole 401 of the pressing rotation shaft, and are used for installing a limiting screw.

[0040] The side magnet mounting hole 403 is a blind hole with a smooth inner wall, opened on the rear side surface of the positioning base 4, located directly below the through hole 404 of the pressing rotation shaft, and the axis corresponds to the axis of the through hole 404 of the pressing rotation shaft up and down. A side magnet is fixedly installed inside the side magnet mounting hole 403, and is used for adsorbing and fixing the rotation shaft handle 1.

[0041] The positioning groove cover placement groove 405 is opened on the front side surface of the positioning base 4, and is a rectangular groove along the left - right direction of the positioning base 4. A central groove is opened in the middle of the bottom surface of the positioning groove cover placement groove 405, and the overall structural dimensions are the same as those of the aforementioned positioning groove 401.

[0042] The positioning groove cover limiting hole 406 is opened on the bottom surface of the positioning base 4, and both ends are respectively connected to the bottom surface of the positioning base 4 and the inside of the positioning groove cover placement groove 405, and the connection position is at the central groove of the bottom surface of the positioning groove cover placement groove 405. A press - in type ball screw is installed inside the positioning groove cover limiting hole 406.

[0043] The bottom magnet mounting groove 408 is opened in the middle of the bottom surface of the positioning base 4, and is used for installing a bottom magnet that cooperates with the rail. Through the cooperation and adsorption between the bottom magnet and the top of the rail, the positioning base 4 is fixed on the top of the rail.

[0044] The positioning strip 407 is a strip - shaped protrusion designed along the left - right direction at the front - rear edge positions of the bottom surface of the positioning base 4, and is used for contacting the top of the rail, so as to avoid damage and fragmentation when the bottom magnet directly contacts and adsorbs the rail, and prevent the fragments from being adsorbed on the rail and affecting the movement of the train. [[ID=*17]]

[0045] As Figure 3 shown, the pressing rotation shaft 2 is composed of cylindrical segments with different diameters, which are respectively the tension - applying section 201, the through - hole mating section 202, the stroke - limiting mating section 203 and the handle - mounting section 204 from the rear to the front. Among them, the through - hole mating section 202, the stroke - limiting mating section 203 and the handle - mounting section 204 are coaxial; the cross - sectional diameter of the through - hole mating section 202 is larger than the cross - sectional diameter of the tension - applying section 201, and the axis is parallel to but not coincident with the axis of the through - hole mating section 202, and the distance between the two axes is designed to be about 0.4 mm.

[0046] As Figure 4As shown, the rotating shaft handle 1 is of a U-shaped structure, and the end joint of the handle mounting section 204 of the pressing rotating shaft 2 is placed between the left and right sides of the rotating shaft handle 1; a handle adsorption threaded hole 101 is also opened in the middle of the rotating shaft handle 1, and an internal hexagonal screw is installed in the handle adsorption threaded hole 101. This internal hexagonal screw is made of iron and is used to cooperate with the magnet in the magnet mounting hole 403. During installation, the cylindrical pin sequentially passes through the handle right threaded hole 102 of the rotating shaft handle 1, the through hole in the end joint of the handle mounting section 204, and then is inserted into the handle left through hole 103 of the rotating shaft handle 1; further, the internal hexagonal screw is threadedly connected with the handle right threaded hole 102 of the rotating shaft handle 1 and contacts the end of the cylindrical pin, thereby realizing the connection between the rotating shaft handle 1 and the end joint 204 of the handle mounting section 204, and enabling the rotating shaft handle 1 to rotate around the connecting bolt. A mark is engraved on one side of the rotating shaft handle 1, and this side is used as the alignment surface for positioning the initial position in the circumferential direction of the pressing rotating shaft during the locking process.

[0047] The above-mentioned pressing rotating shaft 2 is inserted into the pressing rotating shaft through hole 404. By screwing in the limit screw installed in the pressing rotating shaft stroke limit hole 402, the bottom end of the limit screw is located at the stroke limit fitting section 203; at this time, the limit screw is located between the through hole fitting section 202 and the handle mounting section 204, restricting the displacement of the pressing rotating shaft 2 and preventing the pressing rotating shaft 2 from detaching from the positioning base 4.

[0048] When the alignment surface of the rotating shaft handle 1 faces upward and is parallel to the top surface of the positioning base 4, the tension application section 201 in the pressing rotating shaft 2 is coaxial with the bearing hole of the spherical plain bearing installed in the insertion positioning groove 401; at this time, by pushing the pressing rotating shaft 2 forward, the end of the tension application section 201 can be inserted into the bearing hole of the spherical plain bearing installed in the insertion positioning groove 401 for clearance fit. In this embodiment, the front end of the tension application section 201 is designed as a frustum structure to form a guiding conical surface, which cooperates with the bearing hole to guide the tension application section 201 to penetrate into the bearing hole.

[0049] Subsequently, by rotating the rotating shaft handle 1 downward, the pressing rotating shaft 4 rotates around the axis of the through hole fitting section 202. Due to the design that the axis of the tension application section 201 deviates from the axis of the through hole fitting section 202, a radial pressing force is applied to the spherical plain bearing by the tension application section 201 during the rotation of the pressing rotating shaft 2, thereby pressing the spherical plain bearing seat and then fixing the rail profile measuring instrument. When the rotation angle of the rotating shaft handle 1 is 180°, the iron internal hexagonal screw on the rotating shaft handle 1 is adsorbed and fixed with the magnet in the magnet mounting hole 403, and at this time, the bottom surface of the rotating shaft handle 1 is in contact with the front side wall of the positioning base 4, realizing the axial position locking of the pressing rotating shaft 2.

[0050] As Figure 5As shown in the figure, the positioning groove cover 3 is installed in the positioning groove 401 to achieve dust prevention inside the positioning groove 401 and prevent foreign objects from entering the positioning groove cover. The positioning groove cover 3 includes a sealing cover 301 with the same size as the cross-section of the positioning groove 401 and a convex part 302 designed in the middle of the bottom surface of the sealing cover 301. Among them, the convex part 302 cooperates with the middle groove 402 on the bottom surface of the positioning groove 401 and is inserted into the middle groove. At the same time, the thickness of the sealing cover 301 on the left side of the convex part 302 is less than the thickness of the positioning groove 401, and the thickness on the right side is equal to the thickness of the positioning groove 401. When the convex part of the positioning groove cover 3 is inserted into the middle groove 402, the bottom end of the convex part 302 fits with the bottom end of the middle groove 402; at the same time, the side bottom surface of the sealing cover 301 with a larger thickness contacts the bottom surface of the positioning groove 401. At this time, the top surface of the sealing cover 301 seals the top surface of the positioning groove 401 and is flush with the top surface of the positioning base 4. Since the thickness of the left side of the convex part 302 is less than the thickness of the positioning groove 401, by pressing the sealing cover 301 on the left side of the convex part 402 to apply a downward pressure, the convex part 302 will rotate as a support point, causing the right side of the sealing cover 301 to tilt up, and then the sealing cover 301 can be taken out.

[0051] A positioning groove cover through-hole 303 is provided in the middle of the above-mentioned convex part 302. When the positioning groove cover 3 is installed in the positioning groove 401 and the alignment surface of the rotating shaft handle 1 faces upward and is parallel to the top surface of the positioning base 4, the tension application section 201 of the tightening rotating shaft is coaxial with the positioning groove cover through-hole 303; so that the tension application section 201 of the tightening rotating shaft 2 can pass through the positioning groove cover through-hole 303, and further fix the positioning groove cover 3 by rotating the rotating shaft handle 1. At the same time, when the positioning groove cover 3 is installed in the positioning groove cover placement groove 405, the positioning groove cover through-hole 303 is coaxial with the positioning groove cover limiting hole 406, so that the ball of the press-in type ball screw is embedded in the positioning groove cover through-hole 303 to prevent it from falling off easily. The edges of the bottom surface of the sealing cover 301 are all designed with rounded corners to prevent the inner wall of the positioning groove 401 from being worn due to collision with the positioning base 4 when pressing or pulling up the positioning groove cover 3; and the left and right edges of the bottom surface of the convex part 302 are designed with rounded corners so that the convex part 302 can rotate smoothly when the sealing cover 301 is pressed downward. At the same time, an annular groove 304 is designed on the circumferential side wall of the sealing cover 301, so that after pressing the sealing cover 301 to lift one side, a part of the annular groove 304 on this side is exposed, ensuring that the positioning groove cover 3 can be taken out smoothly.

[0052] When applying the above high-efficiency rail profile measuring instrument assembly mechanism for assembling the rail profile measuring instrument, the specific steps are as follows:

[0053] Step 1: Fix the front end of the telescopic rod 5 of the rail profile measuring instrument to the left side of the positioning base 4; the front end of the telescopic rod 5 can be fixed to the connecting plate 7 by screws, and further, the connecting plate 7 and the positioning base 4 are fixed by screws, so as to closely connect the telescopic rod 5 and the positioning base 4. At the same time, it is necessary to ensure that the contact position between the end of the telescopic rod 5 and the rail top is flush with the bottom surface of the positioning strip 407 on the positioning base 4.

[0054] Step 2: Lift the rotating shaft handle 1 and pull the pressing rotating shaft 2 outwards until the through-hole fitting section 202 collides with the hexagon socket screw in the pressing rotating shaft stroke limiting hole 402. At this time, the front end of the tension application section 201 is completely separated from the through-hole 303 of the positioning groove cover.

[0055] Step 3: Remove the positioning groove cover 3, and then press the positioning groove cover 3 into the positioning groove cover placement groove 405. The press-fit ball screw in the positioning groove cover limiting hole 406 will cooperate with the through-hole 303 of the positioning groove cover to limit the positioning groove cover 3 and prevent it from falling off easily.

[0056] Step 4: Clean the surfaces of the positioning base 4 and the positioning groove 401; then insert the joint bearing mounting seat of the rail profile measuring instrument main body equipped with a joint bearing into the positioning groove 401, so that the bottom surface of the rail profile measuring instrument main body is closely fitted with the top surface of the positioning base 4.

[0057] Step 5: Push the rotating shaft handle 1 to make the tension application section 201 in the pressing rotating shaft 2 pass through the bearing hole of the inner joint bearing of the joint bearing mounting seat of the rail profile measuring instrument main body, so that the tension application section 201 is closely fitted with the joint bearing.

[0058] Rotate the rotating shaft handle 180 degrees, which will drive the pressing rotating shaft 2 to rotate. The tension application section 201 applies a pressing force to the bearing mounting seat of the rail profile measuring instrument, so as to lock the rail profile measuring instrument main body and the positioning base 4. Then the rotating shaft handle 1 is put down to make it parallel to the side surface of the positioning base 4 and adsorbed and fixed by the magnet in the magnet mounting hole 403.

[0059] To prevent the pressing rotating shaft 2 from breaking during the rotation of the rotating shaft handle 1 and getting stuck in the pressing rotating shaft through-hole 404 and unable to be taken out, a through-hole is opened at the bottom surface of the central groove of the aforementioned positioning groove cover placement groove 405, which is communicated with the positioning groove 401, coaxial with the pressing rotating shaft through-hole 404 and has the same diameter; furthermore, a cylindrical rod with a diameter slightly smaller than the inner diameter of the through-hole can be inserted into this through-hole to eject the rotating shaft stuck in the pressing rotating shaft through-hole 404.

[0060] Step 6: Place the positioning base 4 of the assembled rail profile measuring instrument on the top of one side rail, and at the same time place the end of the telescopic rod 5 on the top of the other side rail, so that the positioning strip 407 is in close contact with the top of the rail. The magnet 6 applies an adsorption force to fix the whole device on the rail and prevent it from shaking easily, then the device can be operated to complete data acquisition.

[0061] Step 7: After the data acquisition is completed, lift and turn the rotating shaft handle 1 to make the pressing rotating shaft 2 rotate until the tension application section 201 is no longer stressed, then the pressing rotating shaft 2 can be pulled out to remove the main body of the rail profile measuring instrument. Remove the positioning groove cover 3 from the positioning groove cover placement groove 405 in the same way and put it back into the positioning groove 401, and then pass the tension application section 201 through the through hole 305 of the positioning groove cover to push the pressing rotating shaft 2 back to its original position. The telescopic rod 5 of the rail profile measuring instrument does not need to be removed, and the positioning base 4 and the telescopic rod 5 can be put into a packing bucket together, while the main body of the rail profile measuring instrument is put into a packing box separately.

Claims

1. An efficient rail profile measuring instrument assembly mechanism, characterized by: It includes a positioning base and a pressing shaft; The upper surface of the positioning base is provided with a positioning groove, and the middle part of the bottom surface of the positioning groove is provided with a groove, so that the overall shape matches the shape of the joint bearing mounting seat of the rail profile measuring instrument host, and the two are plugged in; a clamping shaft through hole is provided on the side of the positioning base, and the two ends of the clamping shaft through hole are respectively connected to the rear side surface of the positioning base and the interior of the positioning groove; a magnet mounting groove is provided at the bottom of the positioning base, and the internal fixed magnet is adsorbed with the rail to fix the positioning base; The clamping shaft comprises, from back to front, a tensioning force applying section, a through-hole fitting section, a stroke limiting fitting section, and a handle mounting section; wherein the through-hole fitting section, the stroke limiting fitting section, and the handle mounting section are coaxial; the cross-sectional diameter of the through-hole fitting section is larger than the cross-sectional diameter of the tensioning force applying section, and the axis thereof is parallel to but does not overlap with the axis of the through-hole fitting section; The above-mentioned clamping shaft is coaxially inserted into the clamping shaft through hole, and the through hole matching section is clearance-matched with the clamping shaft through hole; at the same time, the tensioning force applying section is coaxial with the joint bearing bearing hole in the joint bearing mounting seat installed at the bottom of the rail profile measuring instrument main unit which is inserted into the positioning groove, and the two are clearance-matched and inserted, and the clamping shaft is rotated to lock the rail profile measuring instrument main unit.

2. The assembly mechanism of a high-efficiency rail profile measuring instrument according to claim 1, characterized in that: A clamping shaft stroke limiting hole is provided on the top surface of the positioning base, and a limit screw is installed in the thread in the hole. The end of the limit screw is screwed into between the through-hole matching section and the handle installation section to limit the axial displacement of the clamping shaft; when the clamping shaft moves to the end of the tensioning force applying section and is inserted into the joint bearing hole in the joint bearing mounting seat of the rail profile measuring instrument host in the positioning groove, the limit screw contacts the handle installation section for limitation; when the clamping shaft moves to the end of the tensioning force applying section and is flush with the rear side wall of the positioning groove, the limit screw contacts the through-hole matching section for limitation.

3. The assembly mechanism of the high-efficiency rail profile measuring instrument according to claim 1, characterized in that: A rotating shaft handle is installed at the end of the handle installation section through a rotating shaft; an iron screw is installed on the rotating shaft handle; at the same time, a hole is opened on the side wall of the positioning base to install a magnet; after the rotating shaft handle is rotated, the iron screw and the magnet are attracted and matched to fix the rotating shaft handle.

4. The assembly mechanism of the high-efficiency rail profile measuring instrument according to claim 1, characterized in that: The end of the tensioning force applying section in the compression shaft is in a frustum structure.

5. The assembly mechanism of the high-efficiency rail profile measuring instrument according to claim 1, characterized in that: A sealing cover is installed at the positioning groove to seal the interior of the positioning groove.

6. The assembly mechanism of the high-efficiency rail profile measuring instrument according to claim 5, characterized in that: The middle part of the bottom surface of the sealing cover has a raised part; the raised part cooperates with the groove on the bottom surface of the positioning groove and is inserted into the groove; at the same time, the thickness of the sealing cover on the left side of the raised part is less than the thickness of the positioning groove, and the thickness on the right side is equal to the thickness of the positioning groove.

7. The assembly mechanism of the high-efficiency rail profile measuring instrument according to claim 6, characterized in that: A hole is opened on the raised portion, and is positioned in cooperation with a ball screw installed in a hole on the top surface of the positioning base.

8. The assembly mechanism of a high-efficiency rail profile measuring instrument according to claim 5, characterized in that: A sealing cover placement groove is also provided on the side wall of the positioning base to place the sealing cover removed from the positioning groove.

9. The assembly mechanism of a high-efficiency rail profile measuring instrument according to claim 1, characterized in that: Positioning bars are installed on two opposite sides of the positioning base.

10. The assembly mechanism of a high-efficiency rail profile measuring instrument according to claim 1, characterized in that: A through hole is formed on the positioning base on the opposite side of the pressing shaft through hole. The through hole is communicated with the positioning groove and the side wall of the positioning base and is coaxial with the pressing shaft through hole.

Images