Centering device for steel rail flaw detector and double-rail type steel rail flaw detector

Abstract

The invention discloses a centering device for a steel rail flaw detector and a double-rail type steel rail flaw detector, and relates to the technical field of rail detection.The centering device for the steel rail flaw detector comprises a mounting frame; a transverse centering part of the transverse adjusting device can keep a set linear distance from one side of the steel rail all the time, and a transverse adjusting part can move close to or away from the transverse centering part so as to achieve adjustment of the transverse position; the tail end of the longitudinal adjusting device is connected with a detection wheel assembly and can drive the detection wheel assembly to longitudinally move to a set position; the deflection adjusting device can adjust the inclination angle of a detection wheel on the detection wheel assembly. The detection assembly can collect pose information of the detection wheel and control actions of the transverse adjusting device and / or the deflection adjusting device according to the collected information. According to the centering device for the steel rail flaw detector and the double-rail type steel rail flaw detector, the angle and the position of the detection wheel can be adjusted according to the dynamic change of the pose of the detection wheel, and good contact between the detection wheel and a steel rail is kept.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of track detection, in particular to a centering device for a rail flaw detector and a double-track rail flaw detector. BACKGROUND

[0002] Railway track, as the core infrastructure of railway transportation system, is subjected to the impact of high-speed heavy-load trains, erosion of complex natural environment, and fatigue loss of materials itself for a long time, and is prone to cracks, wear, internal looseness and other defects. Especially in the high-stress concentration area of the wheel-rail contact interface, especially in the specific contact band of the rail working edge, multiple source surface contact fatigue cracks are prone to occur. If such defects are not discovered in time and repair measures are not taken, it will seriously threaten the safety of train operation, and even may cause derailment and other major railway traffic accidents.

[0003] Currently, rail defect detection mainly relies on non-destructive testing technology, among which ultrasonic testing technology has become the core detection means of modern railway flaw detection equipment due to its excellent defect resolution, extensive detection coverage, high efficiency and safety without radiation pollution. In the double-track ultrasonic flaw detection trolley, the structure of ultrasonic probe built-in ultrasonic probe is usually used on both sides for flaw detection operation. However, in the actual detection process, due to the geometric deformation of the track itself (such as track side bending, high-low irregularity, etc.) and the inevitable snake trajectory of the flaw detection trolley running wheel, the detection device will have lateral displacement and attitude deflection. This phenomenon directly leads to the difficulty of the ultrasonic probe in the ultrasonic probe wheel in continuously and accurately aligning the rail detection area, which further causes the attenuation or even disappearance of the defect echo signal, and finally leads to inaccurate flaw detection results and defect missed detection.

[0004] The centering mechanism of the existing rail flaw detection equipment has certain angle and horizontal adjustment functions, but the adjustment of the ultrasonic probe wheel pose still mainly relies on manual operation. This kind of operation lacks real-time detection and recognition ability of the ultrasonic probe wheel pose, and cannot make quick response and accurate adjustment according to the dynamic change of the probe wheel pose, which greatly restricts the further improvement of the rail flaw detection precision, and it is difficult to meet the high precision and high efficiency requirements of modern railway track safety detection. SUMMARY

[0005] The purpose of the present application is to provide a centering device for a rail flaw detector and a double-track rail flaw detector to solve the problems existing in the prior art, which can adjust the angle and position of the probe wheel according to the dynamic change of the probe wheel pose, and maintain good contact between the probe wheel and the rail.

[0006] To achieve the above purpose, the present application provides the following solutions: The present application provides a centering device for a rail flaw detector, comprising: The mounting frame is used for fixing connection with the rail flaw detector; The lateral adjusting device comprises a lateral centering component and a lateral adjusting component, the lateral centering component can keep a set linear distance with one side of the rail, and the lateral adjusting component can move close to or away from the lateral centering component to realize the adjustment of the lateral position. The longitudinal adjusting device is arranged on the lateral adjusting component, and the longitudinal adjusting device is connected with the probe wheel assembly at the end, and the longitudinal adjusting device can drive the longitudinal movement of the probe wheel assembly to the set position. The deflection adjusting device is connected with the longitudinal adjusting device, and can adjust the inclination angle of the probe wheel on the probe wheel assembly. The detection assembly is arranged on one side of the probe wheel assembly, can collect the pose information of the probe wheel, and controls the action of the lateral adjusting device and / or the deflection adjusting device according to the collected information.

[0007] Preferably, the lateral adjusting device further comprises an optical axis horizontally fixedly connected with the mounting frame, the lateral centering component is arranged on the optical axis, and a probe wheel supporting upper plate is slidably arranged on the optical axis, the probe wheel supporting upper plate is formed as the lateral adjusting component; a lateral adjusting push rod is fixedly connected with the probe wheel supporting upper plate through a mounting seat at the top, and the moving end of the lateral adjusting push rod is connected with the lateral centering component.

[0008] Preferably, the lateral centering component comprises a lateral centering frame slidably arranged on the optical axis, one side of the lateral centering frame abuts against the side wall of the mounting frame through an elastic pre-tightening piece, and the other side abuts against a guide wheel assembly, the guide wheel assembly is slidably arranged on the optical axis, and a guide wheel of the guide wheel assembly is connected with the side wall of the rail.

[0009] Preferably, the guide wheel assembly comprises a guide wheel hanging plate, the upper part of the guide wheel hanging plate is movably arranged on the optical axis, the lower part of the guide wheel hanging plate is connected with the guide wheel, one end of the guide wheel is provided with an annular flange extending along the radial direction of the guide wheel, the guide wheel is rollingly arranged on the rail, and the annular flange is connected with the side wall of the rail.

[0010] Preferably, the longitudinal adjusting device comprises a probe wheel supporting middle plate fixedly connected with the probe wheel supporting upper plate through a connecting plate, a longitudinal driving part is arranged on the probe wheel supporting middle plate, the probe wheel supporting middle plate is connected with the probe wheel assembly at the bottom, and the longitudinal driving part can drive the longitudinal movement of the probe wheel assembly.

[0011] Preferably, the longitudinal driving part comprises a longitudinal adjusting column rotatably connected with the probe wheel supporting middle plate, a probe wheel supporting lower plate is threadedly connected with the lower part of the longitudinal adjusting column, and the probe wheel assembly is arranged on the probe wheel supporting lower plate.

[0012] Preferably, longitudinal adjustment sliding rails are symmetrically arranged on both sides of the middle plate of the probe wheel support, and the lower plate of the probe wheel support is slidably arranged on the corresponding longitudinal adjustment sliding rails.

[0013] Preferably, the probe wheel assembly comprises a probe wheel fixing frame, the probe wheel is rotatably connected to the inner side of the probe wheel fixing frame, a probe wheel clamp is connected to the outer side of the probe wheel fixing frame through a bearing, and the top of the probe wheel clamp is fixedly connected with the lower plate of the probe wheel support; the detection assembly comprises a detection baffle fixedly arranged on the probe wheel fixing frame, a laser displacement sensor is arranged on the outer side of the detection baffle, and the laser displacement sensor is fixedly arranged on a mounting bracket.

[0014] Preferably, the deflection adjusting device comprises a deflection adjusting push rod arranged obliquely, the fixed end of the deflection adjusting push rod is movably connected to the lower plate of the probe wheel support, the telescopic end of the deflection adjusting push rod is connected with a deflection transmission plate, and the bottom of the deflection transmission plate is connected with the probe wheel fixing frame.

[0015] The application also provides a double-track rail flaw detector, which comprises a flaw detector vehicle body and two centering devices for the rail flaw detector as described above; two centering devices for the rail flaw detector are symmetrically arranged on both sides of the bottom of the flaw detector vehicle body; a control module is arranged in the flaw detector vehicle body, and the control module can receive information collected by the collection assembly and control the actions of the lateral adjusting device and / or the deflection adjusting device accordingly.

[0016] The application has the following technical effects relative to the prior art: By arranging the detection assembly, the lateral displacement and angular deflection of the probe wheel can be detected in real time, the real-time monitoring of the probe wheel pose is realized, and compared with the existing manual adjusting mode, the timeliness and accuracy of the probe wheel pose detection are greatly improved; by using the lateral adjusting device and the deflection adjusting device, the lateral and deflection adjustments of the probe wheel can be realized based on the detection information, the adjustment process has high automation degree and does not need manual intervention, the probe wheel pose change can be quickly responded, the probe wheel can be always aligned with the center line of the rail, the defect echo attenuation or disappearance caused by the probe wheel deviation is effectively avoided, and the accuracy and stability of the flaw detection result are improved; before use, the longitudinal adjusting device can form a uniform and gap-free sealing and fitting layer between the outer membrane of the probe wheel and the rail, which not only eliminates the interference of air on the ultrasonic wave propagation, but also ensures that the ultrasonic wave efficiently penetrates the surface of the rail, and the stability and reliability of the flaw detection are further improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below only illustrate some of the embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 It is a schematic view of the overall structure of the centering device for the rail flaw detector according to the present application. Figure 2 It is a schematic view of the lateral adjusting device of the centering device for the rail flaw detector according to the present application. Figure 3 It is a schematic view of the longitudinal adjusting device of the centering device for the rail flaw detector according to the present application. Figure 4 It is a right view of the centering device for the rail flaw detector according to the present application. Figure 5 It is a schematic view of the probe wheel assembly of the centering device for the rail flaw detector according to the present application. Figure 6 It is a schematic view of the centering device for the rail flaw detector according to the present application without the mounting frame. Figure 7 It is a schematic view of the principle of the double-track rail flaw detector according to the present application.

[0019] In the figure: 1 - mounting frame; 2 - centering handle; 3 - pre-tightening spring; 4 - optical axis; 5 - lateral centering frame; 6 - lateral adjusting push rod; 7 - mounting seat; 8 - probe wheel support upper plate; 9 - connecting plate; 10 - longitudinal adjusting column; 11 - probe wheel support middle plate; 12 - probe wheel support lower plate; 13 - longitudinal adjusting slide rail; 14 - counterweight; 15 - deflection adjusting push rod; 16 - deflection transmission plate; 17 - probe wheel; 18 - probe wheel fixing frame; 19 - probe wheel clamp; 20 - guide wheel; 21 - guide wheel hanging plate; 22 - guide plow; 23 - detection baffle; 24 - laser displacement sensor; 25 - rail; 26 - upper computer; 27 - servo control system; 28 - servo driver. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, and not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present application.

[0021] The purpose of the present application is to provide a centering device for a rail flaw detector and a double-track rail flaw detector to solve the problems of the prior art and to adjust the angle and position of the probe wheel according to the dynamic changes of the probe wheel pose, thereby maintaining good contact between the probe wheel and the rail.

[0022] To make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0023] Although the centering mechanism of the existing rail flaw detection equipment has certain angle and horizontal adjustment functions, the adjustment of the ultrasonic probe wheel pose still mainly relies on manual operation. This operation method lacks real-time detection and recognition capability of the ultrasonic probe wheel pose, and cannot make quick response and accurate adjustment according to the dynamic changes of the probe wheel pose, which greatly restricts the further improvement of the rail flaw detection precision and is difficult to meet the high-precision and high-efficiency requirements of modern railway track safety detection. In order to solve this problem, the first purpose of the present application is to provide a centering device for a rail flaw detector, as shown in Figures 1-6 The transverse adjustment device includes a transverse centering part and a transverse adjustment part. The transverse centering part can always maintain a set straight-line distance with one side of the rail 25. The transverse adjustment part can move close to or away from the transverse centering part to realize the adjustment of the transverse position. The longitudinal adjustment device is arranged on the transverse adjustment part, and the end of the longitudinal adjustment device is connected with the probe wheel assembly. The longitudinal adjustment device can drive the probe wheel assembly to move longitudinally to the set position. The skew adjustment device is connected to the longitudinal adjustment device and can drive the inclination angle of the probe wheel 17 on the probe wheel assembly. The probe wheel 17 is an ultrasonic probe wheel, and its flaw detection principle and structure belong to the prior art. The detection assembly is arranged on one side of the probe wheel assembly and can move synchronously with the probe wheel 17. The detection assembly can collect the pose information of the probe wheel 17 and control the actions of the transverse adjustment device and / or the skew adjustment device according to the collected information.

[0024] The present application can detect the lateral displacement and the angle deflection of the probe wheel 17 in real time by the detection assembly, realize the real-time monitoring of the probe wheel 17 posture, greatly improve the timeliness and accuracy of the probe wheel 17 posture detection compared with the existing manual adjustment mode; the lateral adjustment device and the deflection adjustment device can realize the lateral and deflection adjustment of the probe wheel 17 based on the detection information, and the adjustment process has high automation degree and does not need manual intervention, can quickly respond to the probe wheel 17 posture change, ensure that the probe wheel 17 is always aligned with the center line of the rail 25, effectively avoid the defect echo attenuation or disappearance caused by the probe wheel 17 deviation, improve the accuracy and stability of the flaw detection result; the uniform and gap-free sealing and fitting layer between the outer membrane of the probe wheel 17 and the rail 25 can be formed by the longitudinal adjustment device before use, which not only eliminates the interference of air on the ultrasonic wave propagation, but also ensures the efficient penetration of ultrasonic wave through the surface of the rail 25, further improves the stability and reliability of the flaw detection.

[0025] In an embodiment, the lateral adjustment device further comprises a plurality of light shafts 4 horizontally fixedly connected to the mounting frame 1, the light shafts 4 are connected between the mounting frame 1 through screws, and the plurality of light shafts 4 are arranged symmetrically upward and downward; the lateral centering part comprises a lateral centering frame 5 slidingly arranged on the light shaft 4, one side of the lateral centering frame 5 abuts against the side wall of the mounting frame 1 through an elastic pre-tightening piece, and the other side abuts against the guide wheel assembly, the elastic pre-tightening piece of the present embodiment is a pre-tightening spring 3; the guide wheel assembly is slidingly arranged on the light shaft 4, and the guide wheel 20 of the guide wheel assembly is connected with the side wall of the rail 25; a probe wheel support upper plate 8 is slidingly arranged on the light shaft 4, and the probe wheel support upper plate 8 is formed as a lateral adjustment part; a lateral adjustment push rod 6 is fixedly connected to the top of the probe wheel support upper plate 8 through a mounting seat 7, and the moving end of the lateral adjustment push rod 6 is connected with the lateral centering part. The fixed end of the lateral adjustment push rod 6 is installed on the mounting seat 7 through a bolt, and the probe wheel support upper plate 8 is slidingly connected with the two parallel light shafts 4 at the upper part through linear bearings; the lateral adjustment push rod 6 of the present embodiment can adopt an electric push rod or a hydraulic cylinder or an air cylinder.

[0026] In an embodiment, the guide wheel assembly comprises a guide wheel hanging plate 21, the upper part of the guide wheel hanging plate 21 is movably arranged on the optical axis 4 located at the lower part, the lower part of the guide wheel hanging plate 21 is connected with a guide wheel 20, one end of the guide wheel 20 is provided with an annular flange extending along the radial direction of the guide wheel 20, the guide wheel 20 is arranged to roll on the steel rail 25, and the annular flange is clamped with the side wall of the steel rail 25. Since the pre-tightening spring 3 pre-tightens and limits one side of the lateral centering frame 5, the guide wheel 20 is relatively fixed with the position of the steel rail 25 by abutting against the side wall of the steel rail 25, and then the guide wheel 20 abuts against the other side of the lateral centering frame 5 through the guide wheel hanging plate 21, thereby limiting the other side of the lateral centering frame 5, so as to limit the position of the lateral centering frame 5, so that it always maintains a fixed distance with the steel rail 25. In the embodiment, a guide wire plow is further arranged on the guide wheel hanging plate 21, the guide wheel 20 and the guide plow 22 are fixed at the middle position of the guide wheel hanging plate 21 through threaded studs at both ends, and the position control of the guide wheel 20 and the guide plow 22 is realized through the sleeve and the bearing sleeved on the threaded stud, so that the guide wheel 20 and the guide plow 22 have a certain gap and do not interfere with each other. The guide plow 22 can be installed with an insulating block, so as to realize sliding contact with the steel rail 25 and will not interfere with the movement of the whole device along the steel rail 25.

[0027] In an embodiment, the longitudinal adjusting device comprises a probe wheel support middle plate 11 fixedly connected with the probe wheel support upper plate 8 through the connecting plate 9, the probe wheel support middle plate 11 is provided with a longitudinal driving part, the longitudinal driving part comprises a longitudinal adjusting column 10 rotatably connected to the probe wheel support middle plate 11, the lower part of the longitudinal adjusting column 10 is threadedly connected with a probe wheel support lower plate 12 through a nut, the probe wheel support lower plate 12 is provided with a probe wheel assembly, the connection mode of the longitudinal adjusting column 10 and the probe wheel support lower plate 12 is the same as the principle of the screw nut mechanism, by controlling the forward and reverse rotation of the longitudinal adjusting column 10 in place, the nut drives the probe wheel support lower plate 12 to move up and down along the longitudinal adjusting column 10. In order to make the probe wheel support lower plate 12 move more accurately and stably, in an embodiment, longitudinal adjusting slide rails 13 are symmetrically arranged on both sides of the probe wheel support middle plate 11, the probe wheel support lower plate 12 is slidably arranged on the corresponding longitudinal adjusting slide rail 13 on both sides, the longitudinal adjusting slide rail 13 is fixed on both sides of the probe wheel support middle plate 11 through the self-threaded hole, which is used for guiding the longitudinal movement, the probe wheel support lower plate 12 is provided with a counterweight 14 at the bottom, the counterweight 14 is symmetrically arranged near the position of the longitudinal adjusting slide rail 13, which can increase the balance of the probe wheel support lower plate 12.

[0028] In an embodiment, the probe wheel assembly comprises a probe wheel fixing frame 18, the probe wheel 17 is rotationally connected to the inner side of the probe wheel fixing frame 18, the outer side of the probe wheel fixing frame 18 is connected with a probe wheel clamp 19 through a bearing, the probe wheel fixing frame 18 and the probe wheel clamp 19 can rotate relative to each other, the probe wheel fixing frame 18 is fixed to the outer side of the bearing through a pin column, and the probe wheel clamp 19 is fixed to the inner side of the bearing through the pin column; the top of the probe wheel clamp 19 is fixedly connected with the probe wheel supporting lower plate 12; the detection assembly comprises a detection baffle 23 fixedly arranged on the probe wheel fixing frame 18, the detection baffle 23 is connected with the probe wheel fixing frame 18 through a bolt, a laser displacement sensor 24 is arranged on the outer side of the detection baffle 23, the laser displacement sensor 24 is fixedly arranged on the mounting frame 1, the laser displacement sensor 24 emits detection laser to the detection baffle 23, and receives the laser signal reflected by the detection baffle 23; when the probe wheel 17 and the detection baffle 23 are transversely moved or deflected, the detection signal will change, and then the transverse moving distance or the deflection angle of the probe wheel 17 can be judged.

[0029] In an embodiment, the deflection adjusting device comprises a deflection adjusting push rod 15 arranged in an inclined manner, the fixed end of the deflection adjusting push rod 15 is movably connected to the probe wheel supporting lower plate 12, the telescopic end of the deflection adjusting push rod 15 is connected with a deflection transmission plate 16, the bottom of the deflection transmission plate 16 is connected with the probe wheel fixing frame 18, and the deflection adjusting push rod 15 can adopt an electric push rod, an air cylinder or a hydraulic cylinder.

[0030] When the device is used, the vehicle body of the rail 25 flaw detector passes through track line structure change places such as curves or switches, the vehicle body is inclined due to the change of the load of the vehicle body, the inclination causes the probe wheel 17 to deviate from the center line of the rail 25, and then the signal-to-noise ratio of the ultrasonic probe of the probe wheel 17 is greatly reduced, which seriously affects the flaw detection effect. The transverse adjusting push rod 6 in the device can adjust the transverse deviation of the probe wheel assembly, and the deflection adjusting push rod 15 can adjust the angular inclination of the probe wheel assembly, so that the center of the probe wheel 17 is aligned with the center line of the rail 25, and the stability and detection rate of the flaw detection are ensured.

[0031] When the lateral centering frame 5 is installed on the vehicle body, the guide wheel assembly needs to be pushed to move along the optical axis 4 assembled on the mounting frame 1 to the rail 25, so that the inner side of the guide wheel 20 clamps the inner side of the rail 25, and at this time, the pre-tightening spring 3 is in a compressed state. When the laser sensor detects that the probe wheel 17 deviates laterally, the computer or the like controls the transverse adjusting push rod 6 to be elongated or shortened, and since the pre-tightening spring 3 is in a compressed state and the inner side of the guide wheel 20 clamps the rail 25, the lateral centering frame 5 cannot move under the action of the left and right forces, at this time, the elongation and shortening of the transverse adjusting push rod 6 only drive the probe wheel supporting upper plate 8 and the probe wheel 17 to move laterally, so as to adjust the transverse deviation.

[0032] The skew adjustment push rod 15 is mounted on the lower plate 12 of the probe wheel support. When the laser sensor detects that the probe wheel 17 is skewed to the left or right, the computer and other control modules control the skew adjustment push rod 15 to extend or shorten. Figure 4 As shown, when the push rod extends or shortens, the skew transmission plate 16 drives the probe wheel fixing frame 18 to rotate around the bearing at the connection between it and the probe wheel clamp 19, thereby tilting to the left or right and adjusting the angle skew.

[0033] The longitudinal adjustment column 10 of the longitudinal adjustment device rotates, causing the probe wheel support lower plate 12 to move up and down along the longitudinal adjustment slide rail 13. After reaching the appropriate position, it is locked by the fastening ring and the longitudinal adjustment slide rail 13, realizing the mechanical adjustment of the longitudinal position. The purpose of longitudinal adjustment is to form a uniform and gapless sealed bonding layer between the outer membrane of the probe wheel 17 and the rail 25. When the soft membrane is appropriately compressed, air interference is eliminated, and ultrasonic waves can be efficiently penetrated through the surface of the rail 25 to achieve stable sound wave transmission and maintain detection stability.

[0034] The second objective of this invention is to provide a dual-rail rail flaw detector, such as... Figure 7 As shown, the device includes a flaw detector vehicle body and two alignment devices as described above for the rail 25 flaw detector. Two alignment devices for the rail 25 flaw detector are symmetrically arranged on both sides of the bottom of the flaw detector vehicle body. A control module is installed inside the flaw detector vehicle body. The control module uses a host computer 26, which is based on existing technology. The control module can receive information collected by the acquisition components and control the operation of the lateral adjustment device and / or the skew adjustment device accordingly. The detection baffle 23 is fixedly mounted on the probe wheel fixing frame 18, moving laterally with the probe wheel 17 and skewing laterally. The laser displacement sensor 24 is fixedly mounted on the mounting frame 1, completely independent of the detection baffle 23. It can detect the amount of lateral movement and skew when the detection baffle 23 moves laterally or skews, thereby indirectly detecting the magnitude of the lateral movement and skew of the probe wheel 17. Figure 7 As shown, its core principle lies in the rigid connection between the laser sensor and the probe wheel 17. When the relative position of the rail 25 and the probe wheel 17 changes, the initial position and attitude of the detection baffle 23 are first collected in real time by the laser displacement sensing device. The collected data is then transmitted in real time to the main control computer (i.e., the host computer 26), which is a prior art technology. Based on the laser ranging results and the relative installation parameters of the sensor and the probe wheel 17, the spatial offset of the ultrasonic probe wheel 17 axis relative to the center line of the rail 25 is accurately calculated. This calculation process is a prior art technology. The host computer performs PID calculation on the offset according to the preset control logic, generates the corresponding motion correction command, and transmits it to the servo drive unit. This process is implemented using prior art technology. The actuator drives the linear electric push rod according to the received pulse signal, which drives the probe wheel 17 to perform position compensation along the error convergence direction, ultimately realizing the dynamic calibration of the ultrasonic detection device and the center line of the rail 25, and completing the automatic centering control closed loop.

[0035] In use, the inside of the guide wheel 20 is tightly clamped to the inside of the steel rail 25, and the pre-tightening spring 3 is in a compressed state; the longitudinal adjustment column 10 is rotated to drive the probe wheel support lower plate 12 to move up and down along the longitudinal adjustment slide rail 13, and the contact between the outer membrane of the probe wheel 17 and the steel rail 25 is observed until a uniform and gap-free sealing and fitting layer is formed between the outer membrane of the probe wheel 17 and the steel rail 25, and then the longitudinal position of the probe wheel 17 is locked through the threaded fastening ring and the longitudinal adjustment slide rail 13, and the initial adjustment is completed.

[0036] During the driving of the double-track steel rail 25 flaw detector, the laser displacement sensor 24 continuously detects the position changes of the detection baffle 23 synchronously moving with the probe wheel fixing frame 18, including the lateral displacement amount and the angle deflection amount, and transmits the detected real-time data to the upper computer 26 through the communication line.

[0037] After receiving the data transmitted by the laser displacement sensor 24, the upper computer 26 combines the relative installation parameters of the laser displacement sensor 24 and the probe wheel 17 (such as the distance between them, the installation angle, and other preset parameters), and accurately calculates the spatial offset amount (including the lateral offset amount and the angle deflection amount) of the probe wheel 17 axis relative to the center line of the steel rail 25 through the preset existing technology algorithm; according to the spatial offset amount, the upper computer 26 performs PID operation according to the preset control logic to generate corresponding motion correction instructions (including lateral adjustment instructions and deflection adjustment instructions), and sends the instructions to the servo control system 27.

[0038] After receiving the motion correction instructions sent by the upper computer 26, the servo control system 27 belonging to the existing technology converts the instructions into corresponding control signals and sends them to the servo drivers 28 of the lateral adjustment push rod 6 and the deflection adjustment push rod 15; the servo drivers 28 drive the corresponding push rods according to the control signals: if the motion correction instructions are lateral adjustment instructions, the servo drivers 28 drive the lateral adjustment push rod 6 to elongate or shorten; because the pre-tightening spring 3 is in a compressed state and the inside of the guide wheel 20 is clamped to the steel rail 25, the lateral centering frame 5 cannot move under the action of the force in the left and right directions, so the elongation or shortening of the lateral adjustment push rod 6 only drives the probe wheel 17 in the probe wheel 17 adjustment assembly to move left and right until the lateral offset amount of the probe wheel 17 is eliminated and the center of the probe wheel 17 is aligned with the center line of the steel rail 25. If the motion correction instructions are deflection adjustment instructions, the servo drivers 28 drive the deflection adjustment push rod 15 to elongate or shorten; the action of the deflection adjustment push rod 15 is transmitted to the probe wheel fixing frame 18 through the deflection transmission plate 16, which drives the probe wheel fixing frame 18 to rotate around the bearing at the connection between the probe wheel fixing frame 18 and the probe wheel clamp 19, thereby adjusting the deflection angle of the probe wheel 17.

[0039] The principles and implementation manners of the present application are described by using specific examples in the present application, and the above examples are only used for helping to understand the method of the present application and its core idea; meanwhile, for the general technical personnel in the art, according to the idea of the present application, the specific implementation manners and application ranges will be changed. In conclusion, the content of the present specification should not be understood as the limitation of the present application.

Claims

1. A centering device for a rail flaw detector, characterized in that: The utility model relates to a rail flaw detector, which comprises the following parts: a mounting frame fixedly connected to the rail flaw detector; a lateral adjusting device comprising a lateral centering part and a lateral adjusting part, the lateral centering part being capable of maintaining a constant linear distance from one side of the rail, and the lateral adjusting part being capable of moving towards or away from the lateral centering part to adjust the lateral position; a longitudinal adjusting device arranged on the lateral adjusting part and having a probe wheel assembly connected to the end of the longitudinal adjusting device, the longitudinal adjusting device being capable of driving the probe wheel assembly to move longitudinally to a set position; a deflection adjusting device connected to the longitudinal adjusting device and capable of adjusting the inclination angle of the probe wheel on the probe wheel assembly; a detection assembly arranged on one side of the probe wheel assembly and capable of collecting the position information of the probe wheel and controlling the actions of the lateral adjusting device and / or the deflection adjusting device according to the collected information.

2. The centering device for a rail flaw detector according to claim 1, characterized in that: The lateral adjusting device further comprises an optical axis horizontally fixedly connected to the mounting frame, the lateral centering part is arranged on the optical axis, and a probe wheel support upper plate is slidably arranged on the optical axis, the probe wheel support upper plate forming the lateral adjusting part; a lateral adjusting push rod is fixedly connected to the top of the probe wheel support upper plate through a mounting seat, and the moving end of the lateral adjusting push rod is connected to the lateral centering part.

3. The centering device for a rail flaw detector according to claim 2, characterized in that: The lateral centering part comprises a lateral centering frame slidably arranged on the optical axis, one side of the lateral centering frame abutting against the side wall of the mounting frame through an elastic pre-tightening piece, and the other side abutting against a guide wheel assembly, the guide wheel assembly being slidably arranged on the optical axis, and a guide wheel of the guide wheel assembly being connected to the side wall of the rail.

4. The centering device for a rail flaw detector according to claim 3, characterized in that: The guide wheel assembly comprises a guide wheel hanging plate, the upper part of the guide wheel hanging plate being movably arranged on the optical axis, the lower part of the guide wheel hanging plate being connected to the guide wheel, one end of the guide wheel being provided with an annular flange extending along the radial direction of the guide wheel, the guide wheel being rollingly arranged on the rail, and the annular flange being connected to the side wall of the rail.

5. The centering device for a rail flaw detector according to claim 2, characterized in that: The longitudinal adjusting device comprises a probe wheel support middle plate fixedly connected to the probe wheel support upper plate through a connecting plate, the probe wheel support middle plate being provided with a longitudinal driving part, the bottom of the longitudinal driving part being connected to the probe wheel assembly, and the longitudinal driving part being capable of driving the probe wheel assembly to move longitudinally.

6. The centering device for a rail flaw detector according to claim 5, characterized in that: The longitudinal driving part comprises a longitudinal adjusting column rotatably connected to the probe wheel support middle plate, the lower part of the longitudinal adjusting column being threadedly connected to a probe wheel support lower plate, and the probe wheel assembly being arranged on the probe wheel support lower plate.

7. The centering device for a rail flaw detector according to claim 6, characterized in that: The probe wheel support middle plate is symmetrically provided with longitudinal adjusting sliding rails on both sides, the probe wheel support lower plate being slidably arranged on the corresponding longitudinal adjusting sliding rails on both sides, and the probe wheel support lower plate being provided with a counterweight at the bottom.

8. The centering device for a rail flaw detector according to claim 6, characterized in that: The probe wheel assembly comprises a probe wheel fixing frame, the probe wheel being rotatably connected to the inner side of the probe wheel fixing frame, a probe wheel clamp being connected to the outer side of the probe wheel fixing frame through a bearing, and the top of the probe wheel clamp being fixedly connected to the probe wheel support lower plate; the detection assembly comprises a detection baffle fixedly arranged on the probe wheel fixing frame, a laser displacement sensor being arranged on the outer side of the detection baffle, and the laser displacement sensor being fixedly arranged on the mounting frame.

9. The centering device for a rail flaw detector according to claim 8, characterized in that: The deflection adjusting device comprises a deflection adjusting push rod arranged obliquely, a fixed end of the deflection adjusting push rod is movably connected to the probe wheel support lower plate, and a telescopic end of the deflection adjusting push rod is connected with a deflection transmission plate, and the bottom of the deflection transmission plate is connected with the probe wheel fixing frame.

10. A dual rail rail flaw detector characterized by: The device comprises a flaw detector vehicle body and two centering devices for a rail flaw detector as claimed in any one of claims 1-9; two centering devices for a rail flaw detector are symmetrically arranged on the bottom of the flaw detector vehicle body; a control module is arranged in the flaw detector vehicle body, the control module can receive information collected by a collection assembly, and control the action of the lateral adjusting device and / or the deflection adjusting device according to the information.

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