Digital sensor for high-speed train braking system

Abstract

The application discloses a digital sensor of a high-speed rail brake system, which comprises an elastic body, eight strain units, a flexible PCB circuit board, two cable assemblies and a digital amplifier, the elastic body is in a hollow cylindrical structure, and an annular groove is arranged on the upper end surface of the elastic body; the eight strain units form two Wheatstone measurement circuits, the strain units, the flexible PCB circuit board and the digital amplifier are arranged in the annular groove through silica gel encapsulation, the output ends of the two Wheatstone measurement circuits are electrically connected with the input end of the flexible PCB circuit board, and the output end of the flexible PCB circuit board is electrically connected with the input end of the digital amplifier. The application is used for being integrated into a brake actuator to measure the applied braking force, independent double outputs are realized through two independent Wheatstone measurement circuits, the two output signals are the same, the applied braking force in a feedback braking system can be monitored in real time, and mutual monitoring can be realized.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of sensors, and particularly relates to a digital sensor of a high-speed rail brake system. BACKGROUND

[0002] At present, an electronic mechanical brake system is generally used to replace a traditional pneumatic brake, so as to overcome the weaknesses of a hydraulic system in aspects of complicated structure, high installation difficulty and high maintenance cost, thereby promoting the development of industry. The brake system is crucial to the safety of railway vehicles.

[0003] In a traditional pneumatic brake system, two groups of pressure sensors are generally used to respectively measure the pressure of a brake cylinder and the pressure of a joint, and the pressure sensor is a precise electronic measuring component, which has very high requirements on the environment, and high and low temperatures can affect the collection accuracy and collection efficiency of the pressure sensor and the service life. However, the existing electronic mechanical brake system does not install such a sensor for monitoring the stress condition of the brake system, and the stress condition of the brake system cannot be monitored.

[0004] Therefore, in order to control and monitor the electric motor and the entire brake system, a precise digital sensor of a high-speed rail brake system with independent double outputs is urgently needed. SUMMARY

[0005] In order to solve the defects in the prior art, the application provides a digital sensor of a high-speed rail brake system.

[0006] In order to solve the above technical problems, the application provides the following technical scheme:

[0007] The application provides a digital sensor of a high-speed rail brake system, which comprises an elastic body, eight strain units, a flexible PCB circuit board, two cable assemblies and a digital amplifier, the elastic body is in a hollow cylindrical structure, and an annular groove is arranged on the upper end surface of the elastic body; the eight strain units can constitute two Wheatstone measurement circuits, the strain units, the flexible PCB circuit board and the digital amplifier are arranged in the annular groove through silica gel packaging, the output ends of the two Wheatstone measurement circuits are electrically connected with the input end of the flexible PCB circuit board, the output end of the flexible PCB circuit board is electrically connected with the input end of the digital amplifier, and the output end of the digital amplifier is electrically connected with the input end of the cable assembly.

[0008] Preferably, each strain unit comprises a substrate, a first strain gauge and a second strain gauge, the first strain gauge and the second strain gauge are arranged on the substrate, and the eight first strain gauges and the eight second strain gauges constitute the two Wheatstone measurement circuits respectively.

[0009] Preferably, the flexible PCB circuit board is in a circular ring sheet structure, four first rectangular positioning holes and four second positioning holes are arranged on the flexible PCB circuit board, the inner long side of the four first rectangular positioning holes is in an open structure, the outer long side of the four first rectangular positioning holes is circumscribed on the same circle coaxial with the flexible PCB circuit board, the four first rectangular positioning holes and the four second positioning holes are evenly arranged in the circumferential direction of the flexible PCB circuit board, the inner long side and the outer long side of the four second positioning holes are respectively circumscribed on the same circle coaxial with the flexible PCB circuit board, and the outer long side of the second positioning hole is located on the outer side of the outer long side of the first rectangular positioning hole in the radial direction of the flexible PCB circuit board.

[0010] Preferably, the strain unit 2 is attached to the bottom wall of the annular groove and located in the first rectangular positioning hole to form a positive strain unit, and the strain unit 2 is attached to the bottom wall of the annular groove and located in the second positioning hole to form a negative strain unit.

[0011] Preferably, the digital amplifier is in a fan ring sheet structure, and the digital amplifier is located above the flexible PCB circuit board and a separation mechanism is arranged between the digital amplifier and the flexible PCB circuit board.

[0012] Preferably, the separation mechanism is a silica gel layer, and the silica gel layer is arranged between the digital amplifier and the flexible PCB circuit board.

[0013] Preferably, the separation mechanism is a positioning column, and the positioning column is arranged on the wall of the annular groove.

[0014] Compared with the prior art, the present application has the following beneficial effects:

[0015] The present application is used for being integrated into a brake actuator to measure the applied brake force, two independent Wheatstone measurement circuits are used to realize independent double output, and the two output signals are the same, so that the applied brake force in the feedback brake system can be monitored in real time, and mutual monitoring can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the overall structure schematic diagram of the digital sensor of the high-speed rail brake system of the present application;

[0017] Figure 2 is the wiring schematic diagram of the digital amplifier of the digital sensor of the high-speed rail brake system of the present application;

[0018] Figure 3 is the structure schematic diagram of the elastic body in the present application;

[0019] Figure 4 is the structure schematic diagram of the flexible PCB circuit board in the present application;

[0020] Figure 5is a structure diagram of a strain unit in the present application. DETAILED DESCRIPTION

[0021] The preferred embodiments of the present application will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to explain and illustrate the present application, and are not used to limit the present application.

[0022] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", and the like indicate the orientation or positional relationship shown in the accompanying drawings of the specification, and are only used to facilitate the description of the present application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. Figure 1

[0023] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", and "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0024] As shown in Figures 1 to 5 The present embodiment provides a digital sensor of a high-speed rail brake system, which comprises an elastic body 1, 8 strain units 2, a flexible PCB circuit board 3, 2 cable assemblies 5, and a digital amplifier 6. The elastic body 1 is a flat hollow cylindrical structure, and an annular groove 11 is arranged on the upper end surface of the elastic body 1. Due to the limitation of the installation position of the sensor, in the present embodiment, the maximum diameter of the elastic body 1 is 100 mm, and the height is 12 mm; the elastic body 1 is made of aluminum, thereby realizing lightweight design of the sensor and low cost.

[0025] In the present embodiment, the strain unit 2, the flexible PCB circuit board 3, and the digital amplifier 6 are arranged in the annular groove 11 through silicone encapsulation. The 8 first strain gauges 21 constitute a Wheatstone measurement circuit, and the other 8 second strain gauges 22 constitute another Wheatstone measurement circuit. The output ends of the two Wheatstone measurement circuits are electrically connected with the input end of the flexible PCB circuit board 3, the output end of the flexible PCB circuit board 3 is electrically connected with the input end of the digital amplifier 6 through the wire 4, and the output end of the digital amplifier 6 is electrically connected with the input end of the cable assembly 5. Among them, the two Wheatstone measurement circuits are independent of each other, and the two Wheatstone measurement circuits can realize independent double output through the cable assembly 5, and at the same time, since the output signals of the two Wheatstone measurement circuits are the same, they can also realize mutual monitoring, which is convenient for judging whether each output data is real and effective.

[0026] ​In the embodiment, each strain unit 2 comprises a substrate 20, a first strain gauge 21 and a second strain gauge 22, the first strain gauge 21 and the second strain gauge 22 are arranged on the substrate 20, and the eight first strain gauges 21 and the eight second strain gauges 22 respectively constitute two Wheatstone measurement circuits. The thickness of the substrate 20 is 35 microns. The thickness of a general strain gauge substrate 20 is about 25 microns, and experiments show that it cannot withstand a voltage higher than 700VAC, while the sensor can withstand 1000VAC high voltage by increasing the thickness of the substrate 20 to 35 microns, thereby improving the high voltage resistance of the product.

[0027] In the embodiment, the flexible PCB circuit board 3 is in a circular ring sheet structure, and the flexible PCB circuit board 3 is provided with four first rectangular positioning holes 31 and four second positioning holes 32. The inner long side of the four first rectangular positioning holes 31 is in an open structure, and the outer long side of the four first rectangular positioning holes 32 is circumscribed on the same circle coaxial with the flexible PCB circuit board 3. The four first rectangular positioning holes 31 and the four second positioning holes 32 are uniformly arranged in the circumferential direction of the flexible PCB circuit board 3, the inner long side and the outer long side of the four second positioning holes 32 are respectively circumscribed on the same circle coaxial with the flexible PCB circuit board 3, and the outer long side of the second positioning hole 32 is located outside the outer long side of the first rectangular positioning hole 31 in the radial direction of the flexible PCB circuit board 3. The strain unit 2 attached to the bottom wall of the annular groove and located in the first rectangular positioning hole 31 can constitute a positive strain unit, and the strain unit 2 attached to the bottom wall of the annular groove and located in the second positioning hole 32 can constitute a negative strain unit. The first rectangular positioning hole 31 and the second positioning hole 32 are uniformly distributed in the circumferential direction of the flexible PCB circuit board 3, and the positions of the positive strain unit and the negative strain unit are limited by the first rectangular positioning hole 31 and the second positioning hole 32 respectively, and the two independent Wheatstone circuits composed of the eight first strain gauges 21 and the eight second strain gauges 22 can effectively prevent abnormal output caused by load eccentricity or load eccentricity, and improve the linearity of the product.

[0028] In some embodiments, the digital amplifier 6 is in a fan ring sheet structure, and the digital amplifier 6 is located above the flexible PCB circuit board 3 and a separation mechanism is arranged therebetween. The separation mechanism adopts a silica gel layer, which is arranged between the digital amplifier 6 and the flexible PCB circuit board 3.

[0029] In the product assembly, the eight strain units 2 are attached to the bottom wall of the annular groove, and then the flexible PCB circuit board is placed into the annular groove so that the eight strain units 2 are located in the first rectangular positioning hole 31 and the second positioning hole 32 respectively to form corresponding positive and negative strain units, then a silica gel layer is coated on the upper surface of the flexible PCB circuit board, the digital amplifier is welded with the flexible PCB circuit board and the cable assembly and placed on the silica gel layer, and finally the silica gel is used for packaging. In this embodiment, the silica gel layer can effectively prevent the digital amplifier from interfering with the flexible PCB circuit board.

[0030] In some embodiments, the digital amplifier 6 is a fan ring sheet structure, the digital amplifier 6 is located above the flexible PCB circuit board 3, and a separation mechanism is arranged between the two. The separation mechanism adopts three positioning columns which are vertically arranged on the bottom wall of the annular groove, and three through holes are arranged on the flexible PCB circuit board.

[0031] In the product assembly, the strain unit 2 is attached to the bottom wall of the annular groove, and then the flexible PCB circuit board is placed into the annular groove so that the strain unit 2 is located in the first rectangular positioning hole 31 and the second positioning hole 32 respectively to form positive and negative strain units, at this time, the three positioning columns pass through the three through holes of the flexible PCB circuit board and the top of the positioning column protrudes from the upper surface of the flexible PCB circuit board by a certain distance, then the digital amplifier is welded with the flexible PCB circuit board and the cable assembly and placed on the top of the positioning column, and finally the silica gel is used for packaging. In this embodiment, the positioning column can effectively prevent the digital amplifier from interfering with the flexible PCB circuit board.

[0032] The working principle of this embodiment will be further described as follows:

[0033] The sensor is integrated into the brake actuator to measure the applied brake force, the strain gauge senses the signal change caused by the pressure, and then the digital amplifier converts the analog signal into a digital signal. When the brake force changes, it can be transferred to the sensor, and the sensor can feed back the signal to the brake system in real time.

[0034] Finally, it should be noted that: the above is only the preferred embodiment of the present application, and is not used to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A digital sensor for a high-speed rail brake system, characterized in that: The device comprises an elastic body (1), eight strain units (2), a flexible PCB (3), two cable assemblies (5), and a digital amplifier (6); the elastic body (1) is a hollow cylindrical structure, and an annular groove (11) is provided on the upper end surface of the elastic body (1); the eight strain units (2) constitute two Wheatstone measurement circuits; the strain units (2), the flexible PCB (3), and the digital amplifier (6) are arranged in the annular groove (11) through a silicone seal; the output ends of the two Wheatstone measurement circuits are electrically connected to the input end of the flexible PCB (3); the output end of the flexible PCB (3) is electrically connected to the input end of the digital amplifier (6); and the output end of the digital amplifier (6) is electrically connected to the input end of the cable assembly (5); The digital amplifier (6) is a fan-ring sheet structure, and the digital amplifier (6) is located above the flexible PCB circuit board (3), with a separation mechanism provided between the two. Each strain unit (2) comprises a substrate (20), a first strain gauge (21), and a second strain gauge (22); the first strain gauge (21) and the second strain gauge (22) are arranged on the substrate (20), and the eight first strain gauges (21) and the eight second strain gauges (22) respectively constitute two Wheatstone measurement circuits; The flexible PCB circuit board (3) is a circular sheet structure, and is provided with four first rectangular positioning holes (31) and four second positioning holes (32). The inner long sides of the four first rectangular positioning holes (31) are open structures, and the outer long sides of the four first rectangular positioning holes (31) are circumscribed on the same circle coaxial with the flexible PCB circuit board (3); the four first rectangular positioning holes (31) and the four second positioning holes (32) are evenly spaced in the circumferential direction of the flexible PCB circuit board (3), and the inner long sides and outer long sides of the four second positioning holes (32) are respectively circumscribed on the same circle coaxial with the flexible PCB circuit board (3), and the outer long sides of the second positioning holes (32) are located outside the outer long sides of the first rectangular positioning holes (31) in the radial direction of the flexible PCB circuit board (3).

2. The digital sensor for high-speed rail brake system according to claim 1, characterized in that: The strain unit (2) is attached to the bottom wall of the annular groove and is located in the first rectangular positioning hole (31) to form a positive strain unit, and the strain unit (2) is attached to the bottom wall of the annular groove and is located in the second positioning hole (32) to form a negative strain unit.

3. The digital sensor for high-speed railway braking system according to claim 1, characterized in that: The separation mechanism is a silica gel layer, and the silica gel layer is arranged between the digital amplifier (6) and the flexible PCB circuit board (3).

4. The digital sensor for high-speed rail brake system according to claim 1, characterized in that: The separation mechanism is a positioning column, and the positioning column is arranged on the wall of the annular groove.

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