A backflow preventer contact pressure detection device
Patent Information
- Application Number
- CN202522006398.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-18
- Publication Date
- 2026-09-11
- Estimated Expiration
- 2035-09-18
AI Technical Summary
[0003]因为该供电制式的回流是通过走行轨实现的，在运行过程中，由于钢轨与大地之间绝缘过渡电阻的下降或破坏，牵引回流从钢轨泄漏至道床、隧道结构或大地后成为杂散电流；而这些杂散电流，容易对轨道交通本身的走行轨、道床、隧道或桥梁等结构的钢筋，以及轨道交通工程周围的金属管线（煤气管、石油管、给排水管等）造成腐蚀，并产生不同程度的危害、安全隐患和不利影响
[0016]本实用新型通过承载板与支撑梁的结构设计实现了测力机构在两者之间的嵌入，能够准确测量承载板与回流器之间的接触压力，解决了目前没有专门检测回流器与回流轨接触压力的设备的问题；此外，检测装置首尾两端设置的过渡轨能够防止回流器与检测装置接触的瞬间产生冲击力，提高检测装置的安全性与使用寿命；且两端过渡轨对称设置，能够实现双向检测，提高了检测装置的适用性。
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Figure CN224744455U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of rail transit testing, specifically to a return flow contact pressure testing device. Background Technology
[0002] Currently, most urban rail transit projects use a traction power supply system where current is supplied from the overhead contact line (or contact rail) and returned to the running rail. In this system, current is conducted from the overhead contact line (or contact rail) through the train to the running rail and finally returns to the substation. This process enables the train to be powered and ensures its continuous operation.
[0003] Because the return current of this power supply system is achieved through the running rail, during operation, due to the decrease or destruction of the insulation transition resistance between the rail and the ground, the traction return current leaks from the rail to the track bed, tunnel structure or the ground and becomes stray current. These stray currents can easily cause corrosion to the steel bars of the running rail, track bed, tunnel or bridge structure of the rail transit itself, as well as the metal pipelines (gas pipes, oil pipes, water supply and drainage pipes, etc.) around the rail transit project, and produce varying degrees of harm, safety hazards and adverse effects.
[0004] To address the aforementioned issues, a new return current method has been developed: a dedicated return rail is installed at the trackside. The train's return current device contacts and slides along this rail, returning the current to the substation. This effectively avoids stray current corrosion of the running rails or track bed. To achieve better technical performance, steel-aluminum composite conductive rails are currently used for the return current device. However, to ensure a stable and effective return current process, the contact force between the return current device and the return rail needs to be monitored and maintained within a reasonable range. Excessive contact force can cause excessive wear at the return current device's contact points, reducing its service life; while insufficient contact force can lead to unstable return current or leakage. Summary of the Invention
[0005] To address the aforementioned technical problems, this utility model provides a return coil contact pressure detection device, which can automatically detect the contact pressure between the return coil and the return rail during train operation, thus solving the problem that there is currently no dedicated equipment for detecting the contact pressure between the return coil and the return rail.
[0006] Therefore, the technical solution is as follows:
[0007] A reflux rectifier contact pressure detection device is disposed at the end of the reflux rail along the extension direction of the reflux rail; it includes a fixedly disposed support beam, a bearing plate disposed directly above the support beam, and a force measuring mechanism connecting the support beam and the bearing plate;
[0008] When not under pressure, the upper surface of the support plate is flush with the rail surface of the return rail, and the train return device can slide on the support plate; and a gap is formed between the lower surface of the support plate and the top of the support beam; the length of the support plate is less than the distance between two adjacent return devices;
[0009] The force measuring mechanism is disposed within the gap and includes a pressure head, a fixed base, and a measuring element capable of measuring pressure. The measuring element is disposed within the fixed base, which is mounted on the support beam. One end of the pressure head is connected to the measuring element, and the other end is connected to the lower surface of the support plate. When the reflux device slides on the support plate, the contact pressure between it and the support plate is transmitted to the measuring element through the pressure head, thereby enabling the reflux device to measure the pressure on the support plate.
[0010] Furthermore, to avoid instantaneous impact loads when the return valve contacts the support plate, the return valve contact pressure detection device also includes a first transition rail and a second transition rail; the first transition rail and the second transition rail are arranged at both ends of the support beam along the extension direction of the return rail and are fixedly connected to the support beam respectively, and the upper edge of the connection between the first transition rail and the second transition rail and the support beam is flush with and does not contact the upper surface of the support plate when it is not under pressure.
[0011] Furthermore, the first and second transition rails are sloped, with their height values tending to be greater on one side of the support beam.
[0012] Furthermore, the first and second transition rails have the same slope and are symmetrically distributed with respect to the center of the support beam.
[0013] Furthermore, the force measuring mechanism may be two or more.
[0014] Furthermore, the multiple force measuring mechanisms are evenly distributed within the gap.
[0015] Furthermore, the bearing plate is a stainless steel bearing plate.
[0016] This invention achieves the embedding of the force measuring mechanism between the bearing plate and the support beam through a structural design that enables accurate measurement of the contact pressure between the bearing plate and the return flow device. This solves the problem of the lack of specialized equipment for detecting the contact pressure between the return flow device and the return flow rail. In addition, the transition rails at both ends of the detection device prevent impact forces from being generated at the moment of contact between the return flow device and the detection device, improving the safety and service life of the detection device. Furthermore, the symmetrical arrangement of the transition rails at both ends enables bidirectional detection, improving the applicability of the detection device. Attached Figure Description
[0017] Figure 1 A schematic diagram of a reflux condenser contact pressure detection device;
[0018] Figure 2 This is a schematic diagram of a return flow contact pressure detection device equipped with a transition rail. Detailed Implementation
[0019] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and embodiments.
[0020] In the non-electric zone of the vehicle travel section, the return valve contact pressure detection device is set at the end of the return rail or between two return rail sections, forming a track structure together with the return rail along the extension direction of the return rail; the two ends of the return valve contact pressure detection device are arranged in a mating arrangement with the end of the return rail, and the two maintain a preset gap at the mating end to achieve a non-contact state, and the surface of the return valve contact pressure detection device in contact with the return valve is coplanar with the rail surface of the return rail when no force is applied.
[0021] like Figure 1 As shown, a reflux rectifier contact pressure detection device is provided at the end of the reflux rail along the extension direction of the reflux rail; it includes a fixedly provided support beam 2, a bearing plate 1 provided directly above the support beam 2, and a force measuring mechanism 3 connecting the support beam 2 and the bearing plate 1.
[0022] When not under pressure, the upper surface of the bearing plate 1 is flush with the rail surface of the return rail, and the train return device can slide on the bearing plate 1; and a gap 4 is formed between the lower surface of the bearing plate 1 and the top of the support beam 2; the length of the bearing plate 1 is less than the distance between two adjacent return devices.
[0023] The force measuring mechanism 3 is set in the gap 4 and includes a pressure head 32, a fixed base 31, and a measuring element 33 capable of measuring pressure. The measuring element 33 is set in the fixed base 31, which is mounted on the support beam 2 through insulating material. One end of the pressure head 32 is connected to the measuring element 33, and the other end is connected to the lower surface of the support plate 1 through insulating material. When the return flow device slides on the support plate 1, the contact pressure between it and the support plate 1 is transmitted to the measuring element 33 through the pressure head 32, thereby realizing the measurement of the pressure of the return flow device on the support plate 1.
[0024] Furthermore, in order to ensure that the reflux contact pressure detection device is completely protected from current interference, the support beam 2 is fixed by the insulating bracket 5.
[0025] In practical implementation, to facilitate a smooth transition contact between the reflux rectifier and the support plate 1, the reflux rectifier contact pressure detection device also includes a first transition rail 6 and a second transition rail 7; for example Figure 2As shown, the first transition rail 6 and the second transition rail 7 are set at both ends of the support beam 2 along the extension direction of the return rail, and are fixedly connected to the support beam 2 respectively; as one implementation, the first transition rail 6, the second transition rail 7 and the support beam 2 are all structures with an "I" shaped cross section, and the connection between them can be achieved by fishtail clamps and bolts and nuts;
[0026] After being fixedly connected to the support beam 2, the first transition rail 6 and the second transition rail 7 are arranged on the same plane as the upper surface of the bearing plate 1 used to contact the train return device when they are not under pressure, and the first transition rail 6 and the second transition rail 7 maintain a preset gap with the bearing plate 1 to achieve a non-contact state.
[0027] The first transition rail 6 and the second transition rail 7 are sloped, and their height values tend to be greater on one side of the support beam 2; making the overall shape of the return flow contact pressure detection device low on both sides and high in the middle.
[0028] Furthermore, in order to achieve bidirectional detection, which is not limited by the forward or backward direction of the train, the first transition rail 6 and the second transition rail 7 have the same gradient.
[0029] In practice, the measuring element 33 can be selected or set according to the environment of the area to be measured and the measurement accuracy requirements, such as a weighing sensor, a spring balance (press type) or other elements that can realize the force measurement function.
[0030] Taking into account the force measurement span and range, the number of force measuring mechanisms 3 can be one, two or more; when multiple force measuring mechanisms are set, the multiple force measuring mechanisms are evenly distributed in the gap 4, or those skilled in the art can select a suitable location to arrange them on the basis of ensuring the force measurement function is realized.
[0031] In the specific implementation process, in order to improve the accuracy of the pressure detection device, the bearing plate 1 is made of stainless steel with the same material as the contact surface of the return rail; the support beam 2 is made of aluminum alloy with the same material as the web (or bottom) of the return rail.
[0032] Before use, the return valve contact pressure detection device is first fixedly installed at the end of the return rail by the insulating bracket 5, so that the surface of the bearing plate 1 in contact with the return valve is on the same plane as the return rail surface when it is not under stress. Then, the pressure detection work is carried out: when the train runs to the return valve contact pressure detection device, the return valve on the train passes the first transition rail (or the second transition rail) and makes full contact with the bearing plate 1 and slides on it. At this time, the force measuring mechanism 3, which is insulated from the bearing plate 1, detects the pressure between the return valve and the bearing plate 1 and outputs the measurement result, realizing the pressure detection function of the return valve contact pressure detection device.
[0033] This invention cleverly integrates a force-measuring mechanism between the support plate and the supporting beam through structural design, while maintaining the same material for the detection device and the return rail (steel-aluminum composite conductive rail). This allows for accurate measurement of the contact pressure between the support plate and the return device, solving the problem of the current lack of specialized equipment for detecting the contact pressure between the return device and the return rail. Furthermore, symmetrical transition rails at both ends of the detection device effectively prevent impact forces from being generated at the moment of contact between the return device and the detection device, improving the safety and service life of the detection device, while also enabling bidirectional detection and enhancing the applicability of the detection device.
[0034] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and descriptive purposes. It is not intended to be exhaustive, nor to limit the invention to the precise forms disclosed; obviously, many changes and variations are possible in accordance with the foregoing teachings. The exemplary embodiments were chosen and described to explain the specific principles of the invention and its practical application, thereby enabling others skilled in the art to implement and utilize various exemplary embodiments of the invention, as well as their different alternatives and modifications. The scope of the invention is intended to be defined by the appended claims and their equivalents.
Claims
1. A reflux rectifier contact pressure detection device, characterized in that: It is set at the end of the return rail along the extension direction of the return rail; including a fixed support beam (2), a bearing plate (1) set directly above the support beam (2), and a force measuring mechanism (3) connecting the support beam (2) and the bearing plate (1); When not under pressure, the upper surface of the bearing plate (1) is flush with the rail surface of the return rail, and the train return device can slide on the bearing plate; and a gap (4) is formed between the lower surface of the bearing plate (1) and the top of the support beam (2); the length of the bearing plate (1) is less than the distance between two adjacent return devices; The force measuring mechanism (3) is set in the gap (4) and includes a pressure head (32), a fixed seat (31) and a measuring element (33) capable of measuring pressure. The measuring element (33) is set in the fixed seat (31), which is set on the support beam (2). One end of the pressure head (32) is connected to the measuring element (33), and the other end is connected to the lower surface of the bearing plate (1). When the return valve slides on the bearing plate (1), the contact pressure between it and the bearing plate is transmitted to the measuring element (33) through the pressure head (32), thereby realizing the measurement of the pressure of the return valve on the bearing plate (1).
2. The return valve contact pressure detecting apparatus according to claim 1, wherein: It also includes a first transition rail (6) and a second transition rail (7); the first transition rail (6) and the second transition rail (7) are arranged at both ends of the support beam (2) along the extension direction of the return rail, and are fixedly connected to the support beam (2) respectively. The upper edge of the connection between the first transition rail (6) and the second transition rail (7) and the support beam is flush with and does not contact the upper surface of the bearing plate (1) when it is not under pressure.
3. The return valve contact pressure detection apparatus according to claim 2, wherein: The first transition rail (6) and the second transition rail (7) are sloping, and their height values tend to be greater on the side of the support beam (2).
4. The return valve contact pressure detecting apparatus according to claim 3, wherein: The first transition rail (6) and the second transition rail (7) have the same slope and are symmetrically distributed with respect to the center of the support beam (2).
5. The return valve contact pressure detection apparatus of claim 1, wherein: The force measuring mechanism (3) can be two or more.
6. The return valve contact pressure detection apparatus of claim 5, wherein: The multiple force measuring mechanisms (3) are evenly distributed in the gap (4).
7. The backflow preventer contact pressure detection apparatus of claim 1, wherein: The bearing plate (1) is a stainless steel bearing plate; the support beam (2) is an aluminum alloy beam.