Method for monitoring longitudinal displacement of switch rail

Abstract

The invention relates to a method for monitoring longitudinal displacement of a switch rail, which comprises the following steps of: firstly, mounting a stock rail device and a switch rail device on a steel rail, and ensuring that a measuring rod of a magnetostrictive sensor penetrates through the interior of a magnetic ring without contact; then, reading an initial value of the sensor, and reading a value after displacement of the sensor after longitudinal displacement of the switch rail; and finally, subtracting the initial value from the post-displacement value, and deducing the displacement variation of the point of the switch rail in combination with a switch rail expansion and contraction amount formula, so as to obtain the overall longitudinal displacement data of the switch rail under different conditions. Big data driving is not needed, efficient and high-precision measurement of the longitudinal displacement of the switch rail can be achieved under different environmental conditions, and the requirements for low-cost, high-stability and high-precision railway field monitoring are met.

Description

Technical Field

[0001] The invention relates to the field of track detection and monitoring, and in particular to a method for monitoring the longitudinal displacement of a pointed rail. Background Art

[0002] In the operation of high-speed railways, turnouts are key equipment for railway tracks. However, turnouts are characterized by large number, complex structure, limited train speed, low driving safety, and large maintenance investment, making them a major weak link in the track. Among them, the turnout point rail directly affects the speed and safety of train operation. The longitudinal displacement of the point rail refers to the longitudinal displacement of the turnout point rail relative to the base rail. Point rail creep can easily cause the point rail to be not tightly attached to the base rail, which is one of the main defects of turnouts.

[0003] At present, there are three types of monitoring methods for the longitudinal displacement of the point rail: image recognition monitoring, laser monitoring, and mechanical monitoring. The existing image recognition type point rail displacement monitoring is mainly based on an industrial camera combination, combined with a deep learning algorithm for displacement measurement. Deng Chenxin et al. provided a "method for measuring the creeping of railway turnout point rails" in their invention patent application number 202210362300.9. They used an image acquisition device to collect images of the point rail and the base rail and obtain the edge coordinates of the point rail. The actual distance between the edge of the point rail and the boundary was obtained by comparing the calibrated pixel ruler, and the initial distance before the point rail crawled was compared to calculate the crawling direction and crawling distance. Wang Pengxiang et al. provided a "method, device and system for monitoring the creeping amount of the turnout point rail based on image recognition" in their invention patent application number 201710719956.0. They obtained the tip of the point rail and the ruler position through an image acquisition device, compared the relative position of the tip edge of the point rail before and after crawling, and calculated the creeping amount of the turnout point rail by the number of pixels and the distance occupied. Yin Hui et al. proposed a "method and system for monitoring the expansion and contraction displacement of the point rail based on automatic image interpretation" in their invention patent application number 201610232538.4. They used a scale with characteristic chromaticity component integration to extract precise image regions, combined characteristic chromaticity component integration with digital matching, and interpreted the expansion and contraction displacement of the point rail. In terms of laser detection, Jia Zixiang et al. provided a "railway turnout point rail creep monitor" in their utility model patent application number 202223202517.8. They used an infrared ranging module sensor to monitor the creep of the point rail, and combined it with a detachable sliding groove, solar photovoltaic panels and silent pulleys to achieve portable monitoring. Yan Dazhi et al. provided a "device for measuring the creep of the point rail of a turnout" in their utility model patent application number 202121861889.4. They set a positioning reference in the fixed component, set a scale bar and an optical component on the sliding component, measured the displacement difference between the scale bar optical component and the positioning surface, and detected the creep between the point rail and the base rail. Chen Lei et al. provided a "video-based method for monitoring the creep of a switch rail" in their invention patent application number 201911258437.4, which realizes creep monitoring by identifying the edge contour of the switch rail and improves the accuracy of monitoring. Yang Lingzhi et al. provided a "switch state detection system based on switch rail displacement" in their utility model patent application number 20152256527.0. The laser displacement sensor points vertically to the inner vertical end face of the switch rail, and the industrial computer receives the sensor output signal and converts it into a digital signal and then outputs it to the data acquisition card for analysis.

[0004] The above-mentioned image recognition and laser monitoring methods will affect the measurement accuracy when affected by unstable factors such as train vibration, dust, rain, snow, light, etc. The subsequent image processing is difficult and cannot achieve the ideal effect. In addition, the equipment price of this solution is high, which is not conducive to large-scale promotion.

[0005] At present, there are few studies on mechanical measurement and monitoring equipment. The existing mechanical measurement schemes are divided into two schemes. One is the "A kind of switch rail creep monitoring device" proposed by Tan Hua in the invention patent with application number 20141283429.6. It uses an eddy current sensor to indirectly calculate the expansion and contraction of the point rail by measuring the change in the gap between the tip of the point rail and the base rail. However, the stability and accuracy of the eddy current sensor for magnetized metal identification are low, and the technology is not yet perfect; the second is the "Integrated real-time measurement device for longitudinal creep and close gap of the point rail" proposed by Ren Tongqun in the invention patent with application number 20191630367.4. The displacement of the point rail is decomposed into displacement change and angle change, and different sensors are used to measure in sequence. However, this scheme is for the measurement of the tip of the point rail, and the measurement value is the absolute displacement of the point rail, which is inconsistent with the definition of the longitudinal displacement of the point rail.

[0006] In summary, image recognition and laser monitoring methods cannot overcome the influence of environmental factors and are too costly. There is little research on mechanical measurement and monitoring equipment, and the existing solutions have accuracy problems. Therefore, there is still a lack of a monitoring device with low error, high reliability, low cost, and easy installation and disassembly for point rail displacement monitoring. Summary of the invention

[0007] In order to solve the problems of poor reliability, unstable accuracy, high maintenance cost and complex tooling of existing point rail displacement monitoring equipment, the present invention proposes a method for monitoring the longitudinal displacement of the point rail, which uses the magnetostrictive sensor in the monitoring equipment for monitoring the displacement of the point rail at the root end of the point rail to collect data, thereby improving the reliability of the equipment, reducing maintenance costs, and avoiding monitoring errors caused by the lateral displacement of the rail.

[0008] To achieve the above object, the present invention adopts the following technical solutions:

[0009] A method for monitoring longitudinal displacement of a point rail, using a device for monitoring longitudinal displacement of a point rail, characterized in that:

[0010] The switch rail longitudinal displacement monitoring device comprises: a basic rail device structure, which is arranged on the basic rail and includes two groups of basic rail clamps, a large-aperture pad, a small-aperture pad and a magnetostrictive sensor; a switch rail device structure, which is arranged at the heel end of the switch rail and includes a group of switch rail clamps and a magnetic ring; the magnetostrictive sensor passes through the magnetic ring and is used to measure the displacement of the switch rail; the two groups of basic rail clamps each include a rear clamp and a front clamp of the basic rail, which are connected by long bolts and installed on the rail bottom through the clamp groove; the switch rail clamp includes a rear clamp and a front clamp of the switch rail, which are connected by long bolts and installed on the rail bottom through the clamp groove; the magnetic ring is built into the front clamp of the switch rail and can be adjusted in the top magnetic ring adjustment groove in the horizontal and longitudinal directions to ensure that the magnetostrictive sensor measuring rod passes through and does not contact the magnetic ring;

[0011] The method for monitoring the longitudinal displacement of the pointed rail comprises the following steps:

[0012] S10, assuming that the coordinate system of the switch rail longitudinal displacement monitoring device is O-XYZ, the X direction is the axial direction of the magnetostrictive sensor measuring rod, the Y direction is perpendicular to the top surface of the switch rail fixture, and the Z direction is along the radial direction of the measuring rod and parallel to the top surface of the switch rail fixture;

[0013] S11, the longitudinal displacement monitoring device of the point rail is installed at the bottom of the rail, and the long bolts are tightened to ensure that the rear-end clamp is firmly connected with the front-end clamp of the point rail;

[0014] S12, insert the magnetic ring into the adjustment groove of the magnetic ring of the point rail, adjust the magnetic ring to an appropriate position with a non-magnetic material, make the measuring rod of the magnetostrictive sensor pass through the inside of the magnetic ring, and fasten it with a point rail clamp pad;

[0015] S12, keep the longitudinal displacement monitoring device of the pointed rail stable, manually or automatically read the relative position (Xi,0,0) of the magnetic ring measuring point and the measuring rod at this moment, i.e., time Ti, and transmit the measurement result in real time and save it in the host computer;

[0016] S13, when the tip rail heel produces longitudinal displacement, the relative position (Xj, 0, 0) of the magnetic ring measuring point and the measuring rod at this moment, i.e., time Tj, is manually or automatically read, and the measurement result is transmitted in real time and saved in the host computer;

[0017] S14, calculate the current longitudinal displacement dij=Xj-Xi of the tip rail heel end;

[0018] S15, calculate the displacement change of the tip of the point rail by the formula of the expansion and contraction of the point rail ΔL=αΔtL to obtain the overall displacement of the point rail D=ΔL+d ij , where α is the thermal expansion coefficient, Δt is the temperature change, and L is the length of the point rail;

[0019] S16, repeating steps S11 to S15, and intercepting different time intervals ΔT to obtain the longitudinal displacement of the point rail at any time.

[0020] Furthermore, the magnetostrictive sensor is arranged between the two groups of front end clamps of the basic rails, and the sensor electronic compartment is connected to the front end clamps of the basic rails through the cooperation of the fastening plate and the fastening hole.

[0021] Furthermore, the small-aperture pad cooperates with the front end clamp of the stock rail, is arranged on the inner side of the clamp, and is connected by four short bolts to fasten the magnetostrictive sensor measuring rod.

[0022] Furthermore, the large-aperture pad is arranged on the outer side of the front end clamp of the basic rail and is connected by four short bolts to fasten the magnetostrictive sensor electronic compartment to ensure that the longitudinal displacement of the pointed rail measured each time is transmitted in real time and saved in the host computer.

[0023] Furthermore, it also includes a pointed rail clamp pad, which is fastened to the magnetic ring adjustment groove with short bolts to fasten the magnetic ring; the magnetic ring is built into the magnetic ring adjustment groove, and the magnetic ring adjustment groove is filled with non-magnetic elastic material to adjust the position of the magnetic ring and cooperate with the pointed rail clamp pad for fastening.

[0024] The present invention adopts the above technical solution, which has the following advantages:

[0025] 1. Aiming at the problem of monitoring the longitudinal displacement of the point rail, the present invention has developed a contact measurement method based on the magnetostrictive principle, which can ensure that the overall detection device maintains a high monitoring accuracy in a complex environment. Existing contact magnetostrictive measurement devices all use the tip of the point rail as the measurement object, thereby ignoring the longitudinal displacement of the heel of the point rail, and are prone to large errors during the switching process of the point rail. The present invention focuses on the measurement of the longitudinal displacement of the heel of the point rail, calculates the longitudinal displacement of the tip of the point rail through the formula for the expansion and contraction of the point rail, and then obtains the overall displacement of the point rail.

[0026] 2. The present invention has developed a set of split-type tooling fixtures with universality, which is different from other contact magnetostrictive measuring devices. Its tooling principle can ensure the stability of the overall system in complex environments. The present invention adopts a method of combining a mechanical structure with a magnetostrictive sensor. The position change is first monitored by the magnetic ring and the measuring rod to monitor the longitudinal displacement of the point rail. It is divided into two groups of basic rail device structures and one group of point rail device structures. The fixture involved in the basic rail device structure can adjust the tooling position according to magnetostrictive sensors of different ranges. The magnetic ring in the point rail device structure can move inside the adjustment groove to ensure that there is no contact with the measuring rod. The non-magnetic material in the adjustment groove maximizes the measurement accuracy and plays a buffering role between the magnetic ring and the adjustment groove. The present invention fills the technical defects in the field of longitudinal displacement monitoring of point rails, and can improve the applicability of equipment and reduce maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram of the overall structure of a switch rail longitudinal displacement monitoring device in one embodiment of the present invention;

[0028] Figure 2 is a schematic diagram of a basic rail portion fixture structure in one embodiment of the present invention;

[0029] Figure 3 is a schematic structural diagram of a magnetostrictive sensor in one embodiment of the present invention;

[0030] Figure 4 is a schematic diagram of the structure of the front end clamp of the basic rail in one embodiment of the present invention;

[0031] Figure 5 It is a schematic diagram of the assembly structure of the magnetostrictive sensor and the front end fixture of the stock rail in one embodiment of the present invention;

[0032] Figure 6 is a schematic diagram of the rear end clamp structure in one embodiment of the present invention;

[0033] Figure 7 is a schematic diagram of the structure of the clamp for the point rail portion in one embodiment of the present invention;

[0034] Figure 8 is a schematic diagram of the structure of the front end clamp of the pointed rail in one embodiment of the present invention;

[0035] Fig. 9 It is a schematic diagram of the flow chart of the method for monitoring the longitudinal displacement of the pointed rail of the present invention;

[0036] Reference numerals:

[0037] 10-basic rail device structure, 11-rear end fixture, 111-rear end fixture through hole, 112-rear end fixture groove, 12-basic rail front end fixture, 121-basic rail front end fixture groove, 122-basic rail front end fixture through hole, 123-fixture connecting hole, 124-fixture inner side, 125-fixture outer side, 13-magnetostrictive sensor, 131-conducting wire, 132-electronic compartment, 133-connecting plate, 134-measuring rod, 14-small aperture pad, 15-large aperture pad, 16-basic rail;

[0038] 20-point rail device structure, 21-point rail front end clamp, 211-point rail front end clamp groove, 212-point rail front end clamp through hole, 213-magnetic ring adjustment groove, 214-point rail front end clamp top surface, 22-point rail clamp pad, 23-magnetic ring, 24-point rail. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0040] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0041] The present invention provides a device for monitoring the longitudinal displacement of a pointed rail, including a base rail device and a pointed rail device. The base rail device is provided with two groups of left and right clamps and a magnetostrictive sensor, and a single group of clamps includes a rear end clamp, a front end clamp of the base rail, a large (small) aperture pad, a long bolt, a short bolt and a cotter pin. The pointed rail device includes a rear end clamp, a front end clamp of the pointed rail, a pointed rail clamp pad, a magnetic ring, a long bolt, a short bolt and a cotter pin. The present invention is based on a mechanical measurement method and combined with a magnetostrictive sensor to achieve accurate monitoring of the longitudinal displacement of the root end of the pointed rail, thereby improving equipment reliability and reducing maintenance costs.

[0042] In one embodiment of the present invention, Figure 1 As shown, a device for monitoring the longitudinal displacement of a pointed rail is provided, which comprises:

[0043] The basic rail device structure 10 is installed on the basic rail, and there are two groups of them. The front end clamps 12 of the basic rail are installed in the same direction and are respectively arranged on the head and tail sides of the magnetostrictive sensor 13.

[0044] The two sets of stock rail device structures 10 both include a rear end fixture 11 and a stock rail front end fixture 12 ; the rear end fixture 11 and the stock rail front end fixture 12 are connected by long bolts, and a magnetostrictive sensor 13 is installed between the two stock rail front end fixtures 12 .

[0045] The pointed rail device structure 20 is installed at the root end of the pointed rail, and the rear end clamp 11 and the front end clamp 21 of the pointed rail are connected by long bolts. The front end clamp 21 of the pointed rail has a built-in magnetic ring 23, and the magnetostrictive sensor 13 passes through the magnetic ring 23 to measure the displacement of the pointed rail.

[0046] In this embodiment, the material of the front end clamp of the point rail and the front end clamp of the stock rail can be aluminum or other non-magnetic conductive materials, thereby ensuring the accuracy of the present invention during the monitoring process.

[0047] In the above embodiment, Figure 2-Figure 6 As shown, the basic rail device structure 10 includes:

[0048] The front end clamp 12 of the basic rail, the through hole 122 of the front end clamp of the basic rail is connected with the long bolt, the front end clamp groove 121 of the basic rail is connected with the bottom of the basic rail 16, and is opposite to the rear end clamp groove 112;

[0049] The rear end clamp 11, the rear end clamp through hole 111 is connected with the long bolt, the rear end clamp groove 112 is connected with the rail bottom of the basic rail 16, and is opposite to the front end clamp groove 121 of the basic rail;

[0050] The magnetostrictive sensor 13 is installed between the two sets of front-end clamps 12 of the stock rails. On one side, the connecting plate 133 is installed inside the clamp connecting hole 123 and fastened with the large-aperture pad 14. On the other side, the measuring rod 134 passes through the clamp fastening hole 123 and fastens with the small-aperture pad 15.

[0051] A large-aperture backing plate 14, mounted on one of the inner side surfaces 124 of the fixture, for fastening the measuring rod 134;

[0052] A small-aperture pad 15, mounted on the outer side 125 of another fixture, for fastening the connecting plate 133;

[0053] In the above embodiment, Figure 6-Figure 8 As shown, the switch rail device structure 20 includes:

[0054] The rear end clamp 11, the rear end clamp through hole 111 is connected with the long bolt, the rear end clamp groove 112 is connected with the bottom of the point rail 24, and is opposite to the front end clamp groove 211 of the point rail;

[0055] The front end clamp 21 of the pointed rail, the through hole 212 of the front end clamp of the pointed rail is connected with the long bolt, the groove 211 of the front end clamp of the pointed rail is connected with the bottom of the pointed rail 24, and is opposite to the groove 112 of the rear end clamp;

[0056] The pointed rail clamp backing plate 22 is fastened to the magnetic ring adjustment groove 213 by short bolts to fasten the magnetic ring;

[0057] The magnetic ring 23 is built into the magnetic ring adjustment groove 213 , and the magnetic ring adjustment groove 213 can be filled with non-magnetic elastic material to adjust the position of the magnetic ring 23 and to be fastened in conjunction with the point rail clamp pad 22 .

[0058] A method for monitoring the longitudinal displacement of a point rail is also provided, which uses the above-mentioned device for monitoring the longitudinal displacement of a point rail and comprises the following steps:

[0059] S10, assuming that the coordinate system of the switch rail longitudinal displacement monitoring device is O-XYZ, the X direction is the axial direction of the magnetostrictive sensor measuring rod, the Y direction is perpendicular to the top surface of the switch rail fixture, and the Z direction is along the radial direction of the measuring rod and parallel to the top surface of the switch rail fixture;

[0060] S11, the longitudinal displacement monitoring device of the point rail is installed at the bottom of the rail, and the long bolts are tightened to ensure that the rear-end clamp is firmly connected with the front-end clamp of the point rail;

[0061] S12, insert the magnetic ring into the adjustment groove of the magnetic ring of the point rail, adjust the magnetic ring to an appropriate position with a non-magnetic material, make the measuring rod of the magnetostrictive sensor pass through the inside of the magnetic ring, and fasten it with a point rail clamp pad;

[0062] S12, keep the longitudinal displacement monitoring device of the pointed rail stable, manually or automatically read the relative position (Xi,0,0) of the magnetic ring measuring point and the measuring rod at this moment, i.e., time Ti, and transmit the measurement result in real time and save it in the host computer;

[0063] S13, when the tip rail heel produces longitudinal displacement, the relative position (Xj, 0, 0) of the magnetic ring measuring point and the measuring rod at this moment, i.e., time Tj, is manually or automatically read, and the measurement result is transmitted in real time and saved in the host computer;

[0064] S14, calculate the current longitudinal displacement dij=Xj-Xi of the tip rail heel end;

[0065] S15, calculate the displacement change of the tip of the point rail by the formula of the expansion and contraction of the point rail ΔL=αΔtL to obtain the overall displacement of the point rail D=ΔL+d ij , where α is the thermal expansion coefficient, Δt is the temperature change, and L is the length of the point rail;

[0066] S16, repeating steps S11 to S15, and intercepting different time intervals ΔT to obtain the longitudinal displacement of the point rail at any time.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for monitoring the longitudinal displacement of a point rail, using a device for monitoring the longitudinal displacement of a point rail, characterized in that: The switch rail longitudinal displacement monitoring device comprises: a basic rail device structure, which is arranged on the basic rail and includes two groups of basic rail clamps, a large-aperture pad, a small-aperture pad and a magnetostrictive sensor; a switch rail device structure, which is arranged at the heel end of the switch rail and includes a group of switch rail clamps and a magnetic ring; the magnetostrictive sensor passes through the magnetic ring and is used to measure the displacement of the switch rail; the two groups of basic rail clamps each include a rear clamp and a front clamp of the basic rail, which are connected by long bolts and installed on the rail bottom through the clamp groove; the switch rail clamp includes a rear clamp and a front clamp of the switch rail, which are connected by long bolts and installed on the rail bottom through the clamp groove; the magnetic ring is built into the front clamp of the switch rail and can be adjusted in the top magnetic ring adjustment groove in the horizontal and longitudinal directions to ensure that the magnetostrictive sensor measuring rod passes through and does not contact the magnetic ring; The method for monitoring the longitudinal displacement of the pointed rail comprises the following steps: S10, assuming that the coordinate system of the switch rail longitudinal displacement monitoring device is O-XYZ, the X direction is the axial direction of the magnetostrictive sensor measuring rod, the Y direction is perpendicular to the top surface of the switch rail fixture, and the Z direction is along the radial direction of the measuring rod and parallel to the top surface of the switch rail fixture; S11, the longitudinal displacement monitoring device of the point rail is installed at the bottom of the rail, and the long bolts are tightened to ensure that the rear clamp is firmly connected with the front clamp of the point rail; S12, insert the magnetic ring into the adjustment groove of the magnetic ring of the point rail, adjust the magnetic ring to an appropriate position with a non-magnetic material, make the measuring rod of the magnetostrictive sensor pass through the inside of the magnetic ring, and fasten it with a point rail clamp pad; S12, keep the longitudinal displacement monitoring device of the pointed rail stable, manually or automatically read the relative position (Xi,0,0) of the magnetic ring measuring point and the measuring rod at this moment, i.e., time Ti, and transmit the measurement result in real time and save it in the host computer; S13, when the tip rail heel produces longitudinal displacement, the relative position (Xj, 0, 0) of the magnetic ring measuring point and the measuring rod at this moment, i.e., time Tj, is manually or automatically read, and the measurement result is transmitted in real time and saved in the host computer; S14, calculate the current longitudinal displacement dij=Xj-Xi of the heel end of the pointed rail; S15, calculate the displacement change of the tip of the point rail by the formula of the expansion and contraction of the point rail ΔL=αΔtL to obtain the overall displacement of the point rail D=ΔL+d ij , where α is the thermal expansion coefficient, Δt is the temperature change, and L is the length of the point rail; S16, repeating steps S11 to S15, and intercepting different time intervals ΔT to obtain the longitudinal displacement of the point rail at any time.

2. The method for monitoring the longitudinal displacement of a point rail according to claim 1, characterized in that: The magnetostrictive sensor is arranged between the two groups of front end clamps of the basic rails, and the sensor electronic compartment is connected to the front end clamps of the basic rails through the cooperation of the fastening plate and the fastening hole.

3. The method for monitoring the longitudinal displacement of a pointed rail according to claim 1, characterized in that: The small-aperture pad cooperates with the front-end clamp of the stock rail, is arranged on the inner side of the clamp, is connected by four short bolts, and is used to fasten the measuring rod of the magnetostrictive sensor.

4. The method for monitoring the longitudinal displacement of a pointed rail according to claim 1, characterized in that: The large-aperture pad is arranged on the outer side of the front end fixture of the base rail and is connected by four short bolts to fasten the magnetostrictive sensor electronic compartment to ensure that the longitudinal displacement of the pointed rail measured each time is transmitted in real time and saved in the host computer.

5. The method for monitoring the longitudinal displacement of a point rail according to claim 1, characterized in that: It also includes a pointed rail clamp pad, which is fastened to the magnetic ring adjustment groove with short bolts to fasten the magnetic ring; the magnetic ring is built into the magnetic ring adjustment groove, and the magnetic ring adjustment groove is filled with non-magnetic elastic material to adjust the position of the magnetic ring and cooperate with the pointed rail clamp pad for fastening.

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