Auxiliary scanning and positioning device and steel rail pre-welding detection system

Abstract

The utility model discloses an auxiliary scanning positioning device which is used for being connected with a conveying device, the conveying device comprises a machine frame and two carrier roller assemblies, the two carrier roller assemblies are arranged in a spaced mode, are both connected to the machine frame and are used for conveying a steel rail in the designated direction, and the auxiliary scanning positioning device comprises a calibration body and a supporting assembly. The calibration body is used for being spaced from the carrier roller assembly and can be connected to a rack, the calibration body is provided with a fixed channel and a plurality of calibration points, the calibration points are distributed in the circumferential direction of the fixed channel, the supporting assembly comprises a supporting piece, and the supporting piece is used for being connected with the rack and can rotate relative to the calibration body. A calibration channel for a steel rail to pass through is formed between the supporting piece and the inner wall of the fixed channel. According to the utility model, the problem that the mechanical reliability of the shear-type mechanism is easily reduced and detection errors are caused because the gravity of the steel rail is transmitted to the shear-type mechanism through the calibration plate can be effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of rail inspection technology, specifically to an auxiliary scanning and positioning device and a rail pre-welding inspection system. Background Technology

[0002] Pre-welding inspection of rails is a necessary prerequisite for rail welding. This includes checking the rail type and dimensions at both ends, the straightness of the rail ends, the twisting and end face slope, and the surface quality of the entire rail.

[0003] For example, Chinese invention patent CN112880586B, entitled "Dynamic Detection Method for Rail Profile," describes a method where an image acquisition unit collects information from the rail ends to generate end data; another image acquisition unit collects information from the rail body between the two ends to generate body data; the end data and body data are transmitted to a data processing unit, which analyzes and calculates the end data and body data to obtain actual data; the data processing unit also has standard data for steel, and compares the actual data with the standard data to obtain the result data. This device overcomes the randomness of results caused by current manual inspection and avoids the influence of external vibrations, ensuring inspection accuracy.

[0004] The calibration plate for auxiliary testing is raised and lowered relative to the frame under the drive of the scissor mechanism to support the rail. The rail contacts the positioning plate and transmits gravity to the scissor mechanism. After long-term use, this can easily lead to a decrease in the mechanical reliability of the scissor mechanism and cause detection errors. Therefore, there is an urgent need for an auxiliary scanning positioning device and a rail pre-welding inspection system to solve the problem in the existing technology where the gravity of the rail is transmitted to the scissor mechanism through the calibration plate, which can easily reduce the mechanical reliability of the scissor mechanism and thus cause detection errors. Utility Model Content

[0005] The purpose of this utility model is to overcome the above-mentioned technical deficiencies and propose an auxiliary scanning positioning device and a rail pre-welding inspection system to solve the technical problem in the prior art that the mechanical reliability of the scissor mechanism is easily reduced due to the gravity of the rail being transmitted to the scissor mechanism through the calibration plate, thereby causing detection errors.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0007] In a first aspect, this utility model provides an auxiliary scanning and positioning device for connection to a conveying device. The conveying device includes a frame and two idler roller assemblies, which are spaced apart from each other and both connected to the frame for conveying rails along a specified direction. The auxiliary scanning and positioning device includes:

[0008] A calibration body, spaced apart from the idler roller assembly and connectable to the frame, the calibration body having a fixed channel and multiple calibration points distributed along the circumferential direction of the fixed channel; and

[0009] A support assembly includes a support member for connection to the frame and rotatable relative to the calibration body, wherein a calibration channel for the passage of the rail is formed between the support member and the inner wall of the fixed channel.

[0010] In some embodiments, the fixed channel is provided at the center of the calibration body along the guide of the frame, and a plurality of calibration points are spaced apart along the axial direction of the fixed channel and connected to the circumferential sidewall of the calibration body.

[0011] In some embodiments, the calibration body is hollowed out.

[0012] In some embodiments, the calibration body is strip-shaped, and the calibration body has a calibration channel along its length. The support member is rotatably built into the calibration channel and abuts against the rail.

[0013] In some embodiments, a connecting seat is further included, which is disposed between the two idler roller assemblies and connected to the frame. A notch is provided on one side of the calibration body, which communicates with the fixed channel. The support member is rotatably connected to the connecting seat and can abut against the rail. The calibration body is disposed on the support member via the notch and connected to the connecting seat.

[0014] In some embodiments, the support assembly further includes two clamping members disposed on both sides of the support member and slidably connected to the connecting seat respectively. The two clamping members can slide closer to or further away from each other and are used to abut against the rail respectively.

[0015] In some embodiments, the clamping member includes a connecting portion, a rotating portion, and a linear drive portion. The connecting portion is slidably connected to the connecting seat and can pass through the notch. The rotating portion is disposed relative to the rail and rotatably connected to the connecting portion. The rotating portion can abut against the rail. The linear drive portion has a fixed end and an extended end. The linear drive portion is connected to the connecting seat and the connecting portion and is used to drive the connecting portion and the rotating portion to move closer to or away from the rail.

[0016] In some embodiments, the linear drive unit includes a fixed plate and a screw. The fixed plate is spaced apart from the connecting part and fixedly connected to the connecting seat. The fixed plate has a threaded hole. One end of the screw is rotatably connected to the connecting part, and the other end is threadedly connected to the threaded hole and protrudes from the fixed plate.

[0017] In some embodiments, the linear drive unit further includes a handwheel connected to the other end of the screw.

[0018] Secondly, this utility model also provides a rail pre-welding inspection system, including a conveying device and at least one auxiliary scanning and positioning device as described above. The conveying device includes a frame and two idler roller assemblies. The two idler roller assemblies are spaced apart from each other and are both connected to the frame. The calibration body is spaced apart from the idler roller assemblies and connected to the frame. The support member is connected to the frame.

[0019] Compared with the prior art, the beneficial effects of the auxiliary scanning positioning device and the rail pre-welding inspection system provided by this utility model include: the auxiliary scanning positioning device includes a calibration body and a support assembly. The calibration body is connected to the frame and has a fixed channel and multiple calibration points. The support assembly is connected to the frame and can rotate relative to the calibration body. The calibration body can abut against the rail. A calibration channel for the rail to pass through is formed between the support assembly and the inner wall of the fixed channel. This provides support for the rail passing through the calibration channel and positions and calibrates the rail passing through the calibration channel. Compared to existing technologies, this new technology utilizes a rotatable support component relative to the calibration body. This support component, upon contact with the rail, rotates relative to the frame, providing support for the rail. Multiple calibration points are distributed along the circumference of the calibration channel, ensuring reference points can be set along the circumference of the rail. This replaces the direct contact between the rail and the vertically moving calibration plate in existing technologies, reducing the impact of long-term use on the mechanical performance of the shearing mechanism, minimizing calibration point errors, enabling full-view inspection, eliminating the need to adjust the calibration object, and improving inspection accuracy. It also solves the problem in existing technologies where the weight of the rail, transmitted through the calibration plate to the scissor mechanism, reduces the mechanical reliability of the scissor mechanism, leading to inspection errors. Attached Figure Description

[0020] Figure 1 This is a three-dimensional diagram of an auxiliary scanning and positioning device and a rail pre-welding inspection system connected to a rail, as provided in an embodiment of this utility model.

[0021] Figure 2 This is a three-dimensional view from another perspective of an auxiliary scanning positioning device and a rail pre-welding inspection system provided in an embodiment of this utility model;

[0022] Figure 3 It is along Figure 2 Enlarged view of point A in the middle;

[0023] Figure 4This is a three-dimensional view of the auxiliary scanning and positioning device and the rail pre-welding inspection system provided in this embodiment of the utility model, connected to the rail from another perspective.

[0024] Figure 5 This is a three-dimensional view of the connection between the frame, connecting seat, support component, calibration body and rail provided in the embodiment of this utility model.

[0025] Explanation of reference numerals in the attached figures:

[0026] Conveying device 100; frame 110; idler assembly 120; rail 200; calibration body 300; calibration point 310; fixed channel 320; support assembly 400; support member 410; clamping member 420; connecting part 421; rotating part 422; linear drive part 423; fixed plate 4231; screw 4232; handwheel 4233; connecting seat 500. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0028] To address the technical problem of decreased mechanical reliability and resulting detection errors in existing technologies due to long-term use of the scissor mechanism supporting the calibration plate and rail 200, this invention provides an auxiliary scanning positioning device and a rail pre-welding inspection system. This system utilizes a support member 410 that can rotate relative to the calibration body 300. When the support member 410 abuts against the rail 200, it can rotate relative to the frame 110, providing support for the rail 200. Simultaneously, multiple calibration points 310 are distributed along the circumference of the calibration channel, ensuring that reference points can be set along the circumference of the rail 200. This enables full-view inspection, avoids adjusting the calibration object, and improves detection accuracy.

[0029] It should be noted that the auxiliary scanning and positioning device described in this utility model is used in, but not limited to, the field of rail 200 detection technology. For ease of explanation, this utility model only uses the application of the auxiliary scanning and positioning device in the field of rail 200 detection technology as an example for explanation. The principle of the auxiliary scanning and positioning device applied to other types of equipment is essentially the same as that applied to the field of rail 200 detection technology, and will not be described in detail here.

[0030] Please see Figures 1 to 5 , Figure 1 , Figure 4This is a schematic diagram of the auxiliary scanning and positioning device and the rail pre-welding inspection system in one embodiment of the present invention. The auxiliary scanning and positioning device is used in conjunction with the conveying device 100. The conveying device 100 includes a frame 110 and two idler roller assemblies 120. The two idler roller assemblies 120 are spaced apart from each other and are both connected to the frame 110 for conveying the rail 200 in a specified direction. The auxiliary scanning and positioning device includes a calibration body 300 and a support assembly 400. The calibration body 300 is spaced apart from the idler roller assemblies 120 and connected to the frame 110. The calibration body 300 has a fixed channel 320 and multiple calibration points 310. The multiple calibration points 310 are distributed along the circumferential direction of the fixed channel 320. The support assembly 400 includes a support member 410. The support member 410 is connected to the frame 110 and can rotate relative to the calibration body 300. A calibration channel for the rail 200 to pass through is formed between the support member 410 and the inner wall of the fixed channel 320.

[0031] In this device, the auxiliary scanning and positioning device includes a calibration body 300 and a support assembly 400. The calibration body 300 is connected to the frame 110 and has a fixed channel 320 and multiple calibration points 310. The support assembly 410 is connected to the frame 110 and can rotate relative to the calibration body 300. The calibration body 300 can abut against the rail 200. A calibration channel for the rail 200 to pass through is formed between the support assembly 410 and the inner wall of the fixed channel 320. This provides support for the rail 200 passing through the calibration channel and positions and calibrates the rail 200 passing through the calibration channel.

[0032] Compared to existing technologies, by setting a support member that can rotate relative to the calibration body 300, and by using the support member 410 to abut against the rail 200, the support member 410 can be pushed to rotate relative to the frame 110 to provide support force for the rail 200. At the same time, multiple calibration points 310 are distributed along the circumference of the calibration channel, so that reference points can be set in the circumferential direction of the rail 200. The use of the support member 410 that can rotate relative to the frame 110 to abut against the rail 200 replaces the direct contact between the rail and the vertically lifting calibration plate in the existing technology. This reduces the impact of long-term use or the mechanical performance of the shearing mechanism, reduces the error of the calibration points, enables full-view detection, avoids the need to adjust the calibration object, improves detection accuracy, and solves the problem in the existing technology where the weight of the rail is transmitted to the scissor mechanism through the calibration plate, which can easily reduce the mechanical reliability of the scissor mechanism and thus cause detection errors.

[0033] Furthermore, the auxiliary scanning and positioning device is mounted on the frame 110, and the rail 200 can pass through the auxiliary scanning and positioning device under the drive of the roller assembly 120, for use in assisting the detection system. The detection system here includes the auxiliary scanning and positioning device and the conveying device 100, which are conventional settings known to those skilled in the art, and will not be described in detail here.

[0034] Furthermore, the calibration point 310 serves as a reference point. Setting the reference point in the circumferential direction of the rail 200 can improve the accuracy of the reference point and detect errors.

[0035] In one embodiment, please refer to Figure 1 , Figure 4 and Figure 5 A fixed channel 320 is provided at the center of the calibration body 300 along the guide of the frame 110, and multiple calibration points 310 are spaced apart along the axial direction of the fixed channel and connected to the circumferential sidewall of the calibration body 300.

[0036] Multiple calibration points 310 are evenly arranged along the circumference of the rail 200, and the multiple calibration points 310 are distributed in a circle along the axis of the rail 200.

[0037] In one embodiment, as shown in the figure, the calibration body 300 is hollowed out.

[0038] The calibration body 300 is hollow and consists of a cage-like structure composed of multiple rods. This structure reduces the weight of the calibration body 300 and also prevents the side walls of the calibration body 300 from obstructing the rail 200, thus effectively improving the detection accuracy.

[0039] In one embodiment, please refer to Figure 1 , Figure 4 and Figure 5 The calibration body 300 is strip-shaped, and a calibration channel is provided along its length. The support member 410 is rotatably built into the calibration channel and abuts against the rail 200.

[0040] The calibration channel is oriented in the same direction as the length of the calibration body, and the support 410 is built into the calibration channel to reduce the size of the device.

[0041] Furthermore, the support member 410 can also be rotatably connected to one or both ends of the calibration body 300 and set on the path of the rail 200, which will not be elaborated further here.

[0042] In one embodiment, please refer to Figure 1 , Figure 4 and Figure 5 The cross-section of calibration body 300 is a regular polygon.

[0043] To improve the accuracy of the calibration cage as a reference and enhance the detection precision, the cross-section of the calibration body 300 is a regular polygon.

[0044] Furthermore, the calibration body 300, with its regular polygonal cross-section, not only has a uniform structure but also low production cost, meeting the needs of industrial use.

[0045] In one embodiment, the cross-section of the calibration body 300 is a regular hexagon.

[0046] Furthermore, the number of sides (e.g., six-sided, eight-sided, or twelve-sided) is dynamically selected based on the testing requirements, and a highly stable material system is used in conjunction with it; this will not be elaborated further here.

[0047] Furthermore, one or two calibration points 310 are respectively provided on the six sides of the calibration cage in this device. The one or two calibration points 310 are spaced apart along the side length of the calibration cage, which will not be elaborated further here.

[0048] In one embodiment, the calibration body consists of six vertical bars and multiple horizontal bars, wherein the six horizontal bars form a group, a group of horizontal bars connects the six vertical bars, and multiple groups of horizontal bars are arranged at intervals along the length of the vertical bars to form a hollow cage structure.

[0049] Furthermore, multiple calibration points are provided on the surfaces of both the vertical and horizontal bars. These calibration points are spaced apart along the length of the vertical and horizontal bars to improve the accuracy of calibration and reference, and reduce detection errors.

[0050] In this embodiment, as Figure 5 As shown, the auxiliary scanning and positioning device also includes a connecting seat 500, which is disposed between two roller assemblies 120 and connected to the frame 110. A notch is provided on one side of the calibration body 300, which is connected to the calibration channel. The support member 410 is disposed relative to the rail 200 and can abut against the rail 200. The calibration body 300 is disposed on the support member 410 through the notch and connected to the connecting seat 500.

[0051] To accommodate the support 410, a notch is provided on one side of the calibration cage. The connecting seat 500 is used to connect and support the calibration cage, and the notch is used to connect the support body, so that the support body can be built into the calibration channel and rotate relative to the connecting seat 500.

[0052] Furthermore, the support member 410 is composed of rollers, which can support the rail 200 and rotate relative to the connecting seat 500, which will not be described in detail here.

[0053] In this embodiment, as Figure 3 , Figure 5 As shown, the support assembly 400 also includes two clamping members 420. The two clamping members 420 are disposed on both sides of the support member 410 and are slidably connected to the connecting seat 500 respectively. The two clamping members 420 can slide closer to or further away from each other and abut against the rail 200 respectively.

[0054] Two clamping members 420 are respectively provided on both sides of the rail 200. The two clamping members 420 can slide relative to the connecting seat 500 and slide closer or further away.

[0055] Furthermore, the two adjustable clamps 420 can correct or finely adjust the movement direction of the rail 200, so that it is transported in the specified direction, which is conducive to the smooth progress of the surface inspection of the rail 200 and improves the inspection accuracy.

[0056] In one embodiment, such as Figure 3 , Figure 5 As shown, the clamping member 420 includes a connecting part 421, a rotating part 422, and a linear drive part 423. The connecting part 421 is slidably connected to the connecting seat 500 and can pass through the notch. The rotating part 422 is disposed relative to the rail 200 and is rotatably connected to the connecting part 421. The rotating part 422 can abut against the rail 200. The linear drive part 423 has a fixed end and an extended end. The fixed end of the linear drive part 423 is connected to the connecting seat 500, and the extended end is connected to the connecting part 421. It is used to drive the connecting part 421 and the rotating part 422 to move closer to or away from the rail 200.

[0057] The rotating part 422 is slidably connected to the connecting seat 500 via the connecting part 421. Driven by the linear drive part 423, the rotating part 422 can slide relative to the connecting seat 500 together with the connecting part 421.

[0058] Furthermore, the connecting part 421 here includes a sliding block and at least one guide block. The connecting seat 500 has at least one guide groove relative to the guide block. The guide block and the guide groove cooperate to slide, so as to realize the sliding connection between the sliding block and the connecting seat 500. The rotating part 422 includes a rotating shaft and a rotating roller. The sliding block has a receiving groove relative to the rail 200. The rotating roller is rotatably connected to the receiving groove via the rotating shaft and can abut against the rail 200. Further details are omitted here.

[0059] In one embodiment, such as Figure 5 As shown, the linear drive unit 423 includes a fixed plate 4231 and a screw 4232. The fixed plate 4231 is spaced apart from the connecting part 421 and is fixedly connected to the connecting seat 500. The fixed plate 4231 has a threaded hole. One end of the screw 4232 is rotatably connected to the connecting part 421, and the other end is threadedly connected to the threaded hole and protrudes from the fixed plate 4231.

[0060] The screw 4232 and the threaded hole cooperate to form a linear drive structure similar to a ball screw and nut pair. By rotating the screw 4232 relative to the fixed plate 4231, the connecting part 421 can be driven to slide relative to the connecting seat 500.

[0061] Furthermore, the linear drive unit 423 here can also be replaced by a push rod motor, a cylinder, or a hydraulic cylinder, etc. This is a conventional setting known to those skilled in the art, and will not be described in detail here.

[0062] In one embodiment, such as Figure 5 As shown, the linear drive unit 423 also includes a handwheel 4233, which is connected to the other end of the screw 4232.

[0063] The handwheel 4233 is connected to the other end of the screw 4232 for easy adjustment and operation by the user.

[0064] Here, the handwheel 4233 is a common and readily available device on the market, and is a standard setting known to those skilled in the art, so it will not be described in detail here.

[0065] In this embodiment, a rail pre-welding inspection system is also disclosed, including a conveying device 100 and at least one auxiliary scanning and positioning device as described above.

[0066] There may be one, two or three idler roller assemblies 120, which can be reasonably set according to the actual needs. The two adjacent calibration bodies 300 are connected by fasteners to form a detachable connection.

[0067] In one embodiment, the rail pre-welding inspection system also includes a five-axis robotic arm and a 3D structured light scanner. The fixed end of the five-axis robotic arm is connected to the frame 110, and the movable end is connected to the 3D structured light scanner. The robotic arm is used to drive the 3D structured light scanner to rotate relative to the rail 200, so that the 3D structured light scanner can use the calibration points 310 set on the calibration body 300 to complete the inspection of the geometric dimensions of the rail 200.

[0068] Furthermore, the five-axis robotic arm and 3D structured light scanning are common and readily available equipment on the market, and are standard setups known to those skilled in the art, so they will not be elaborated further here.

[0069] To better understand this utility model, the following is combined with... Figures 1 to 5 The technical solution of this utility model is described in detail below:

[0070] The auxiliary scanning and positioning device includes a calibration body 300 and a support assembly 400. The calibration body 300 is connected to the frame 110 and has a fixed channel 320 and multiple calibration points 310. The support assembly 410 is connected to the frame 110 and can rotate relative to the calibration body 300. The calibration body 300 can abut against the rail 200. A calibration channel for the rail 200 to pass through is formed between the support assembly 410 and the inner wall of the fixed channel 320. The support assembly 410 provides support for the rail 200 passing through the calibration channel and positions and calibrates the rail 200 passing through the calibration channel. Compared to existing technologies, by setting a support member that can rotate relative to the calibration body 300, and by using the support member 410 to abut against the rail 200, the support member 410 can be pushed to rotate relative to the frame 110 to provide support force for the rail 200. At the same time, multiple calibration points 310 are distributed along the circumference of the calibration channel, so that reference points can be set in the circumferential direction of the rail 200. The use of the support member 410 that can rotate relative to the frame 110 to abut against the rail 200 replaces the existing technology in which the rail directly contacts the vertically lifting calibration plate, reducing the impact of long-term use or the mechanical performance of the shearing mechanism, reducing the error of the calibration points, enabling full-view detection, avoiding the need to adjust the calibration object, and improving detection accuracy.

[0071] In the specific working process of this utility model, the rail 200 moves along the length of the frame 110 under the drive of the roller assembly 120. The end of the rail 200 passes through the calibration channel of the calibration body 300 and abuts against the support member 410 to form support for the rail 200. The friction between the rail 200 and the support member 410 can push the support member 410 to rotate relative to the connecting seat 500, so that the rail 200 can continue to move relative to the frame 110. By rotating the handwheel 4233 to drive the screw 4232 to rotate relative to the fixed plate 4231, the rotating parts 422 on both sides of the rail 200 can be driven to move relative to the rail 200, thereby realizing the correction of the rail 200 and assisting and guiding the rail 200 to move relative to the frame 110.

[0072] Furthermore, the multiple calibration points 310 on the calibration body 300 can provide multiple reference points for the scanning device during detection, forming a full-view calibration reference point, reducing detection errors and improving accuracy.

[0073] When in use, this device can solve the problem in the prior art where the weight of the rail is transmitted to the scissor mechanism through the calibration plate, which easily reduces the mechanical reliability of the scissor mechanism and thus leads to detection errors.

[0074] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. An auxiliary scanning and positioning device for connection to a conveying device, the conveying device comprising a frame and two idler roller assemblies, the two idler roller assemblies being spaced apart from each other and both connected to the frame, for conveying steel rails along a specified direction, characterized in that... The auxiliary scanning and positioning device includes: A calibration body, spaced apart from the idler roller assembly and connectable to the frame, the calibration body having a fixed channel and multiple calibration points distributed along the circumferential direction of the fixed channel; and A support assembly includes a support member for connection to the frame and rotatable relative to the calibration body, wherein a calibration channel for the passage of the rail is formed between the support member and the inner wall of the fixed channel.

2. The auxiliary scanning and positioning device according to claim 1, characterized in that, The calibration body has a fixed channel at its center along the guide of the frame, and a plurality of calibration points are spaced apart along the axial direction of the fixed channel and connected to the circumferential sidewall of the calibration body.

3. The auxiliary scanning and positioning device according to claim 1, characterized in that, The calibration body is hollowed out.

4. The auxiliary scanning and positioning device according to claim 1, characterized in that, The calibration body is strip-shaped, and the calibration body has a calibration channel along its length. The support member is rotatably built into the calibration channel and abuts against the rail.

5. The auxiliary scanning and positioning device according to claim 1, characterized in that, It also includes a connecting seat, which is disposed between the two idler roller assemblies and connected to the frame. A notch is provided on one side of the calibration body, which is connected to the fixed channel. The support member is rotatably connected to the connecting seat and can abut against the rail. The calibration body is disposed on the support member through the notch and connected to the connecting seat.

6. The auxiliary scanning and positioning device according to claim 5, characterized in that, The support assembly further includes two clamping members, which are disposed on both sides of the support member and are slidably connected to the connecting seat respectively. The two clamping members can slide closer to or further away from each other and are used to abut against the rail respectively.

7. The auxiliary scanning and positioning device according to claim 6, characterized in that, The clamping member includes a connecting part, a rotating part, and a linear drive part. The connecting part is slidably connected to the connecting seat and can pass through the notch. The rotating part is disposed relative to the rail and is rotatably connected to the connecting part. The rotating part can abut against the rail. The linear drive part is connected to the connecting seat and the connecting part and is used to drive the connecting part and the rotating part to move closer to or away from the rail.

8. The auxiliary scanning and positioning device according to claim 7, characterized in that, The linear drive unit includes a fixed plate and a screw. The fixed plate is spaced apart from the connecting part and is fixedly connected to the connecting seat. The fixed plate has a threaded hole. One end of the screw is rotatably connected to the connecting part, and the other end is threadedly connected to the threaded hole and protrudes from the fixed plate.

9. The auxiliary scanning and positioning device according to claim 8, characterized in that, The linear drive unit also includes a handwheel, which is connected to the other end of the screw.

10. A pre-welding inspection system for rails, characterized in that, The device includes a conveying device and at least one auxiliary scanning and positioning device as described in any one of claims 1-9. The conveying device includes a frame and two idler roller assemblies, the two idler roller assemblies being spaced apart from each other and both connected to the frame. The calibration body is spaced apart from the idler roller assemblies and connected to the frame. The support member is connected to the frame.

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