Brake test device for single-vehicle wind test
By using laser rangefinders and wireless signal transmission technology, the extension and retraction stroke of the brake cylinder piston rod is automatically detected, solving the problems of time-consuming, labor-intensive, and error-prone traditional manual measurement. This enables rapid and accurate braking performance testing, improving the safety of train operation.
Patent Information
- Application Number
- CN202422983415.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-04
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-12-04
AI Technical Summary
Traditional manual measurement of piston stroke is time-consuming, labor-intensive, and prone to errors, making it difficult to accurately detect the braking performance of the brake cylinder and affecting train operation safety.
Using a laser rangefinder and wireless signal transmission technology, the extension and retraction stroke of the brake cylinder piston rod is automatically detected and transmitted wirelessly to a host computer for analysis, achieving rapid and accurate detection.
It enables rapid and accurate detection of piston stroke, reduces the time and error rate of manual measurement, and improves the reliability and safety of the braking system.
Smart Images
Figure CN223623573U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of single-vehicle air test technology, specifically to a braking test device for single-vehicle air test. Background Technology
[0002] The single-car air test of a freight train (hereinafter referred to as the "air test") is an important procedure for comprehensively testing the braking performance of a freight train. The air test mainly includes the following aspects: ball-passing test, leakage test, sensitivity test, and emergency braking test. In the emergency braking test, the braking performance of the brake cylinder is mainly tested, and the piston stroke is one of the key indicators of the brake cylinder's braking performance.
[0003] Therefore, during the test run, the piston stroke can be checked to determine whether the brake cylinder is working properly and whether the braking system can respond quickly and accurately to the driver's braking command. This is crucial to ensuring that the train can stop or decelerate in time in an emergency. Freight trains usually have large load capacities and high speeds, so the reliability of their braking system is directly related to the safety of train operation.
[0004] Detecting piston stroke helps to detect potential faults in the braking system in a timely manner, such as piston jamming and leakage, thereby avoiding these faults from threatening the safety of train operation. However, traditional manual measurement methods are not only time-consuming and labor-intensive, but also prone to errors.
[0005] Therefore, we propose a testing device that provides accurate test results and saves time and effort. Utility Model Content
[0006] The purpose of this utility model is to provide a braking test device for single-vehicle wind test, which has the advantages of accurate test results and saving time and effort.
[0007] This utility model is achieved through the following technical solution:
[0008] A braking test device for single-vehicle wind test includes a base, a test frame, a laser rangefinder, and a signal transmission unit;
[0009] The base is used to mount the brake cylinder and the test frame, and the test frame corresponds to the piston rod of the brake cylinder;
[0010] A laser rangefinder is fixedly installed on the test frame, and the measuring end of the laser rangefinder corresponds to the rod head of the piston rod.
[0011] The signal output terminal of the laser rangefinder is electrically connected to the signal transmission unit.
[0012] The signal transmission unit is connected to the host computer via wireless transmission.
[0013] Furthermore, the number of laser rangefinders is set to two, and the distance between the two laser rangefinders and the piston rod head is the same.
[0014] Furthermore, the signal transmission unit includes a battery, a voltage conversion module, a main control module, and a wireless transmission module, wherein the power output terminal of the battery is electrically connected to the voltage conversion module, and the power output terminal of the voltage conversion module is electrically connected to the main control module and the wireless transmission module respectively.
[0015] The signal input pin of the main control module is electrically connected to the signal output terminal of the laser rangefinder, and the signal output pin of the main control module is electrically connected to the wireless transmission module.
[0016] Furthermore, the signal transmission unit also includes a display module, the power output terminal of the voltage conversion module is electrically connected to the display module, and the output pin of the main control module is electrically connected to the display module.
[0017] Furthermore, the main control module adopts STM32F103C8T6.
[0018] Furthermore, the wireless transmission module uses the E32-433T20S chip.
[0019] The technical solution of this utility model has at least the following advantages and beneficial effects:
[0020] This utility model discloses a braking test device for single-vehicle wind test. It can automatically detect the extension and retraction stroke of the piston rod through a laser rangefinder, achieving the purpose of saving time and effort, and the test results of the instrument are also more accurate.
[0021] In addition, the ranging signal is transmitted to the host computer wirelessly, which reduces the use of cables and thus lowers the production cost of this device. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of one structure of the present utility model.
[0023] Figure 2 This is a schematic diagram of the signal transmission unit structure of this utility model.
[0024] Figure 3 This is a schematic diagram of the main control module circuit structure of this utility model.
[0025] Figure 4 This is a schematic diagram of the circuit structure of the wireless transmission module of this utility model.
[0026] Figure 5 This is a schematic diagram of the display module circuit structure of this utility model.
[0027] Reference numerals: 1. Base; 2. Test frame; 3. Laser rangefinder; 4. Signal transmission unit; 41. Battery; 42. Voltage conversion module; 43. Main control module; 44. Wireless transmission module; 45. Display module; 5. Brake cylinder; 6. Piston rod. Detailed Implementation
[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0031] In the description of this utility model, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" appear to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0032] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0033] Example 1
[0034] As attached Figure 1 The braking test device for a single vehicle wind test shown includes a base 1, a test frame 2, a laser rangefinder 3, and a signal transmission unit 4;
[0035] The base 1 is used to mount the brake cylinder 5 and the test frame 2, and the test frame 2 corresponds to the piston rod 6 of the brake cylinder 5;
[0036] The brake cylinder 5 is fixedly mounted on one side of the base 1 by straps or mounting brackets, while the test frame 2 is located on the other side of the base 1. The test frame 2 can be mounted on the base 1 by a sliding mechanism, so that it can move along the length of the base 1 towards or away from the brake cylinder 5. The sliding mechanism can be composed of a sliding groove and a cylinder. The sliding groove is opened on the base 1, and the test frame 2 is installed in the sliding groove. The cylinder is mounted on the base 1, and the telescopic end of the cylinder is connected to the test frame 2. By telescopically extending and retracting the cylinder, the test frame 2 is pushed to move in the sliding groove, thereby realizing the movement of the test frame 2.
[0037] A laser rangefinder 3 is fixedly installed on the test frame 2. The measuring end of the laser rangefinder 3 corresponds to the rod head of the piston rod 6. The distance between the laser rangefinder 3 and the rod head of the piston rod 6 is measured by the laser rangefinder 3, so that the extension and retraction stroke of the piston rod 6 can be measured when the piston rod 6 of the brake cylinder 5 is actuated.
[0038] It should be noted that the piston rod 6 of the brake cylinder 5 generally has a forked structure. Therefore, the laser rangefinder 3 measures one forked end of the piston rod 6, and the laser rangefinder 3 is parallel to the piston rod 6.
[0039] The signal output terminal of the laser rangefinder 3 is electrically connected to the signal transmission unit 4;
[0040] The signal transmission unit 4 is connected to the host computer via wireless transmission.
[0041] The distance data measured by the laser rangefinder 3 can be transmitted wirelessly to the host computer, which then analyzes the distance data to determine whether the braking capacity of the brake cylinder 5 meets the standard.
[0042] Furthermore, two laser rangefinders 3 are provided, and the distances between the two laser rangefinders 3 and the piston rod 6 head are the same. Since the piston rod 6 head of the brake cylinder 5 has a forked structure, the two laser rangefinders 3 correspond one-to-one with the two forked ends of the piston rod 6, and the two laser rangefinders 3 and the piston rod 6 are in a parallel state. The measurement results of the two laser rangefinders 3 can be mutually verified, thereby improving the accuracy of the measurement results.
[0043] Furthermore, since some special models of current railway freight cars have two sets of braking devices, such as the SQ5, SQ6, and SQ7 models, using two laser rangefinders can meet the needs of these special models, that is, to simultaneously measure and test the braking devices of these models.
[0044] Example 2
[0045] As attached Figure 2 The signal transmission unit 4 shown includes a battery 41, a voltage conversion module 42, a main control module 43, and a wireless transmission module 44. The power output terminal of the battery 41 is electrically connected to the voltage conversion module 42, and the power output terminal of the voltage conversion module 42 is electrically connected to the main control module 43 and the wireless transmission module 44, respectively. The voltage conversion module 42 is used to convert the high voltage of the battery 41 into the low voltage used by the main control module 43, the wireless transmission module 44, and the display module 45.
[0046] In addition, battery 41 can also be connected to an external power source via a charging module, thereby improving the sustainability of battery 41;
[0047] The signal input pin of the main control module 43 is electrically connected to the signal output terminal of the laser rangefinder 3, and the signal output pin of the main control module 43 is electrically connected to the wireless transmission module 44.
[0048] As shown in the appendix Figure 3 The peripheral circuit of the main control module 43 shown includes a filter capacitor, a crystal oscillator, a debugging interface, and a reset circuit;
[0049] As attached Figure 4 The wireless transmission module 44 shown includes a wireless transmission chip and peripheral circuits consisting of a power management circuit, a reset circuit, a data transmission interface, a protection and filtering circuit, an adjustable resistor, a transistor, and a pull-up resistor.
[0050] In addition, the signal transmission unit 4 also includes a display module 45, the power output terminal of the voltage conversion module 42 is electrically connected to the display module 45, and the output pin of the main control module 43 is electrically connected to the display module 45;
[0051] As shown in the appendix Figure 5 The display module 45 shown includes a display screen and peripheral circuits consisting of a power management circuit, a reset circuit, a data transmission interface, a protection and filtering circuit, an adjustable resistor, a transistor, and a pull-up resistor.
[0052] Specifically, the main control module 43 adopts an STM32F103C8T6;
[0053] This chip has the advantages of high performance, namely, it adopts the ARM Cortex-M3 core, with a maximum operating frequency of 72MHz, providing excellent computing power and low power consumption; it supports single-cycle 32x32-bit multiplication and hardware division, which greatly improves the operation speed.
[0054] 2. It has a rich set of peripherals, including multiple advanced timers (such as TIM1 and TIM8), general-purpose timers (such as TIM2 to TIM5), and basic timers (such as TIM6 and TIM7), suitable for various timing and counting needs;
[0055] It supports multiple standard communication interfaces such as USART, SPI, I2C, and CAN, facilitating data exchange with other devices. ADC and DAC: It features a built-in 12-bit analog-to-digital converter (ADC) and a 12-bit digital-to-analog converter (DAC), suitable for analog signal acquisition and generation.
[0056] And a DMA controller, through which the direct memory access (DMA) controller can reduce the CPU load and improve data transfer efficiency.
[0057] 3. Multiple low-power modes are available, including sleep mode, stop mode, and standby mode. You can select the appropriate low-power mode according to your application needs to extend battery life.
[0058] And flexible power management: It supports a variety of power management options, such as voltage regulators and external power switching, to further optimize power consumption.
[0059] 4. It has the advantage of being easy to develop, as ST provides a variety of development tools, such as STM32CubeMX, STM32CubeIDE and HAL library, which simplifies the development process;
[0060] Furthermore, due to the widespread use of the STM32 series, there are abundant development resources, tutorials, and community support available online, making it easier for developers to solve problems and learn.
[0061] 5. It has the advantage of high integration, with built-in 64 KB flash memory and 20 KB SRAM to meet the needs of most embedded applications; the integration of an 8 MHz internal high-speed oscillator and a 40 kHz internal low-speed oscillator reduces the need for external components and lowers costs.
[0062] 6. It has the advantages of high reliability, including power monitoring, undervoltage detection, and overtemperature protection, ensuring that the system can operate safely under abnormal conditions; and it has built-in independent watchdog and window watchdog to prevent program crashes and improve system stability.
[0063] The wireless transmission module 44 uses an E32-433T20S chip;
[0064] This chip has the advantage of long-distance transmission. In open areas, the transmission distance can reach several kilometers, depending on the antenna type and environmental conditions. It also has a receiving sensitivity of -120 dBm, which enables the module to work stably even under low signal strength, further improving the transmission distance.
[0065] 2. It has the advantage of low power consumption, supports sleep mode, standby mode and hibernation mode, and can optimize power consumption in different application scenarios; in receive mode, the current consumption is only 12 mA; in transmit mode, the current consumption is around 100 mA depending on the power level; the standby current is as low as 2 μA, which is very suitable for battery-powered devices.
[0066] 3. High reliability: It adopts FSK modulation, has good anti-interference ability, and can work stably in complex electromagnetic environments; it supports CRC check and address matching functions to ensure the accuracy of data transmission.
[0067] 4. Simple and easy to use, it communicates with the main control module via UART serial port, making it simple and convenient to use; the module can be configured via AT commands, including working mode, transmission rate, power level, etc.; through modular design, it can be directly soldered or connected to the circuit board via pin header, which is convenient for rapid integration.
[0068] 5. High cost-performance ratio: Compared with other high-performance wireless modules, the E32-433T20S achieves a good balance between performance and price, making it suitable for large-scale applications; and applicable to various scenarios such as IoT, smart home, industrial automation, and agricultural monitoring.
[0069] 6. Flexible power control: The chip supports four power levels: 0 dBm, +10 dBm, +17 dBm and +20 dBm. The transmit power can be adjusted according to actual needs to balance power consumption and transmission distance.
[0070] 7. Stable performance: The chip operates in a temperature range of -40°C to +85°C, making it suitable for various environmental conditions.
[0071] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A braking test device for single-vehicle wind test, characterized in that: It includes a base (1), a test frame (2), a laser rangefinder (3), and a signal transmission unit (4); The base (1) is used to mount the brake cylinder (5) and the test frame (2), and the test frame (2) corresponds to the piston rod (6) of the brake cylinder (5); A laser rangefinder (3) is fixedly installed on the test frame (2), and the measuring end of the laser rangefinder (3) corresponds to the rod head of the piston rod (6); The signal output terminal of the laser rangefinder (3) is electrically connected to the signal transmission unit (4); The signal transmission unit (4) is connected to the host computer via wireless transmission.
2. The braking test device for single-vehicle wind test according to claim 1, characterized in that: The number of laser rangefinders (3) is set to two, and the two laser rangefinders (3) are parallel to the piston rod (6), and the distance between the measuring end of the two laser rangefinders (3) and the rod head of the piston rod (6) is the same.
3. The braking test device for single-vehicle wind test according to claim 1, characterized in that: The signal transmission unit (4) includes a battery (41), a voltage conversion module (42), a main control module (43), and a wireless transmission module (44). The power output terminal of the battery (41) is electrically connected to the voltage conversion module (42), and the power output terminal of the voltage conversion module (42) is electrically connected to the main control module (43) and the wireless transmission module (44) respectively. The signal input pin of the main control module (43) is electrically connected to the signal output terminal of the laser rangefinder (3), and the signal output pin of the main control module (43) is electrically connected to the wireless transmission module (44).
4. The braking test device for single-vehicle wind test according to claim 3, characterized in that: The signal transmission unit (4) further includes a display module (45), the power output terminal of the voltage conversion module (42) is electrically connected to the display module (45), and the output pin of the main control module (43) is electrically connected to the display module (45).
5. The braking test device for single-vehicle wind test according to claim 3, characterized in that: The main control module (43) adopts STM32F103C8T6.
6. The braking test device for single-vehicle wind test according to claim 3, characterized in that: The wireless transmission module (44) uses the E32-433T20S chip.