Wheel-rail force sensor

Abstract

The present application discloses a wheel-rail force sensor, comprising: an elastic body arranged on a track and a clamping assembly for fixing the elastic body; the elastic body comprises: a strain arm arranged on the track, a strain gauge arranged at the center of the strain arm and a signal line electrically connected to the strain gauge; the strain arm is arranged in an H shape, comprises a force arm body symmetrically arranged on both sides of the strain gauge, and the center thickness of the force arm body is greater than the thickness at both ends; an insulating pad is arranged between the strain arm and the track; there is a certain gap between the strain gauge and the track; the strain gauge can sense track changes through the force arm body.

Description

Technical Field

[0001] The present disclosure generally relates to the field of railway measurement technology, and in particular to a wheel-rail force sensor. Background Art

[0002] Railway transportation is the main artery of my country's transportation and plays a pivotal role in my country's economic development. With the vigorous development of my country's high-speed railways, it is very necessary to monitor the running status of trains on the line by measuring wheel-rail forces to ensure the safety of train operation.

[0003] The traditional method of measuring wheel-rail force generally adopts the method of sticking strain gauges on the rail waist and axis. In the actual construction process, there are problems such as long construction time, poor stability, low accuracy, short life, and poor waterproofness, which is not conducive to promotion. Summary of the invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a wheel-rail force sensor.

[0005] A wheel-rail force sensor comprises: an elastic body arranged on a track and a clamping assembly for fixing the elastic body;

[0006] The elastic body includes: a strain arm arranged on the track, a strain gauge arranged at the center of the strain arm, and a signal line electrically connected to the strain gauge; the strain arm is arranged in an H shape, including a force arm body symmetrically arranged on both sides of the strain gauge, and the center thickness of the force arm body is greater than the thickness at both ends; an insulating pad is arranged between the strain arm and the track; there is a certain gap between the strain gauge and the track; the strain gauge can sense track changes through the force arm body.

[0007] According to the technical solution provided in the embodiment of the present application, the clamping assembly includes: a clamp and several clamping bolts arranged on the clamp; the clamping bolts pass through the clamp and one end of the clamping bolts clamps the force arm body; an insulating sleeve is provided between the clamping bolts and the force arm body.

[0008] According to the technical solution provided in the embodiment of the present application, a hollow protective cover is further provided on the outside of the clamp, and the protective cover can wrap the elastomer.

[0009] According to the technical solution provided in the embodiment of the present application, a groove is provided at the connection between the force arm body and the strain gauge, and the groove can concentrate stress.

[0010] According to the technical solution provided in the embodiment of the present application, the elastic body and the clamping assembly are provided in two and are symmetrically arranged on both sides of the track.

[0011] In summary, the above technical solution of the present application can accurately measure and transmit the wheel-rail force by setting the elastic force; when using the device, Figure 1As shown, firstly, the waist of the rail is polished at the installation position and an insulating pad is pasted, then the clamping assembly is fixed to both sides of the rail by screws, and the clamping bolts are screwed into the clamping assembly; the clamping bolts are tightened according to the required torque, and under the pressure of the clamping bolts, the weak points at both ends of the lever body are elastically bent and deformed, and fit closely with the waist of the rail; when the wheel passes through the measuring area, due to the friction between the elastic body, the insulating pad and the rail, the deformation of the rail is transmitted to the center of the elastic body through the lever body, causing the resistance of the strain gauge to change, resulting in an imbalance of the Wheatstone bridge and an output voltage signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0013] Figure 1-3 A three-dimensional structural diagram of this application;

[0014] Figure 4 This is a top view of the present application.

[0015] Numbers in the figure: 1, clamping assembly; 2, strain arm; 3, strain gauge; 4, signal line; 5, insulation pad; 6, clamping bolt; 7, insulation sleeve; 8, protective cover; 9, fixture; 10, groove. DETAILED DESCRIPTION

[0016] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0017] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0018] Embodiment 1

[0019] A wheel-rail force sensor comprises: an elastic body arranged on a track and a clamping assembly 1 for fixing the elastic body;

[0020] The elastic body includes: a strain arm 2 arranged on the track, a strain gauge 3 arranged at the center of the strain arm 2 and a signal line 4 electrically connected to the strain gauge 3; the strain arm 2 is set in an H shape, including a force arm body symmetrically arranged on both sides of the strain gauge 3, and the center thickness of the force arm body is greater than the thickness at both ends; an insulating pad 5 is provided between the strain arm 2 and the track; there is a certain gap between the strain gauge 3 and the track; the strain gauge 3 can sense track changes through the force arm body.

[0021] When using this device, if Figure 1 As shown, firstly, the waist of the rail is polished at the installation position, and the insulating pad 5 is pasted, then the clamping assembly 1 is fixed to both sides of the rail by screws, and the clamping bolts 6 are screwed into the clamping assembly 1; the clamping bolts 6 are tightened according to the required torque, and under the pressure of the clamping bolts 6, the weak points at both ends of the lever body are elastically bent and deformed, and fit closely with the waist of the rail; when the wheel passes through the measuring area, due to the friction between the elastomer, the insulating pad 5 and the rail, the deformation of the rail is transmitted to the center of the elastomer through the lever body, causing the resistance of the strain gauge 3 to change, resulting in an imbalance of the Wheatstone bridge and outputting a voltage signal, thereby measuring the wheel-rail force on the track. The device has good stability, high precision, good waterproof performance, and also extends the service life.

[0022] Among them, when the elastomer is subjected to the pressure of the clamping bolt 6, the weak parts of the upper and lower ends of the lever arm body can produce elastic bending deformation, and then fit closely with the arc surface of the rail waist, increase the friction contact area, improve the friction force, and do grid-type knurling treatment on the surface of one side of the rail, which can further improve the friction force under the condition of unchanged pressure, so that the lever arm body can transmit the deformation of the rail more quickly and accurately, thereby making the device have high sensitivity; the elastic bending of the lever arm body can give the clamping bolt 6 a reaction force, so that the clamping bolt 6 is not easy to loosen, and has an anti-loosening effect.

[0023] In order to further optimize the above technical solution, the present technical solution preferably also provides the following improvements: the clamping assembly 1 includes: a fixture 9 and a plurality of clamping bolts 6 arranged on the fixture 9; the clamping bolts 6 pass through the fixture 9, and one end of the clamping bolts 6 clamps the arm body; an insulating sleeve 7 is arranged between the clamping bolts 6 and the arm body. Figure 2 As shown, positioning and installation are performed by means of a fixture 9, which is convenient to operate, saves time, has high positioning accuracy, strong stability, and is easy to install and maintain.

[0024] In order to further optimize the above technical solution, the present technical solution preferably also provides the following improvements: a hollow protective cover 8 is further provided on the outside of the clamp 9, and the protective cover 8 can wrap the elastic body. Figure 2 As shown, since the top surface of the protective cover 8 is designed with an inclination angle, rainwater can be quickly drained away, making the device more waterproof.

[0025] In order to further optimize the above technical solution, the present technical solution preferably also provides the following improvements: a groove 10 is provided at the connection between the arm body and the strain gauge 3, and the groove 10 can concentrate stress. Figure 3 As shown, the groove 10 at the connection between the arm body and the strain gauge 3 causes the stress to be more concentrated at the connection, causing more significant deformation, thereby improving the measurement accuracy of the sensor.

[0026] In order to further optimize the above technical solution, the present technical solution preferably also provides the following improvements: the elastic body and the clamping assembly 1 are provided in two pieces and are symmetrically arranged on both sides of the track. Figure 4 As shown, the elastic body and the clamping assembly 1 are symmetrically arranged on both sides of the track, so that accurate measurement can be performed.

[0027] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A wheel-rail force sensor, characterized in that: include: An elastic body arranged on the track and a clamping assembly (1) for fixing the elastic body; The elastic body comprises: a strain arm (2) arranged on the track, a strain gauge (3) arranged at the center of the strain arm (2), and a signal line (4) electrically connected to the strain gauge (3); the strain arm (2) is arranged in an H shape, comprises a force arm body symmetrically arranged on both sides of the strain gauge (3), and the center thickness of the force arm body is greater than the thickness at both ends; an insulating pad (5) is arranged between the strain arm (2) and the track; there is a certain gap between the strain gauge (3) and the track; the strain gauge (3) can sense track changes through the force arm body; A groove (10) is provided at the connection between the arm body and the strain gauge (3); the groove (10) at the connection between the arm body and the strain gauge (3) makes the stress more concentrated at the connection, causing the strain gauge (3) to deform more significantly, thereby improving the measurement accuracy of the sensor; A clamp (9) and a plurality of clamping bolts (6) arranged on the clamp (9); the clamping bolts (6) pass through the clamp (9) and one end of the clamping bolts (6) clamps the force arm body; an insulating sleeve (7) is arranged between the clamping bolts (6) and the force arm body.

2. A wheel-rail force sensor as claimed in claim 1, characterized in that: A hollow protective cover (8) is also provided on the outside of the clamp (9), and the protective cover (8) can wrap the elastomer.

3. A wheel-rail force sensor according to claim 1, characterized in that: The elastic body and the clamping assembly (1) are provided in two pieces and are symmetrically arranged on both sides of the track.

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