A method for reducing speed of a rail camera car

Abstract

The application provides a speed reduction method of a speed reduction device for a track photography vehicle. The speed reduction device for the track photography vehicle comprises a speed detection assembly and a braking assembly. The speed detection assembly is used to detect the initial speed of the track vehicle entering a braking section. The braking assembly comprises a brake and a blocking cable assembly. The blocking cable assembly is used to intercept the track vehicle. The brake is connected with the blocking cable assembly to transmit torque. The brake is used to generate braking torque. The speed reduction braking of the high-speed track vehicle is realized through the external blocking cable assembly and the speed detection assembly. Different braking torques can be output according to the initial speed of different track vehicles entering the braking section. When the track vehicle and the blocking cable assembly are in contact, uniform load is generated, the track vehicle and the carried equipment will not be damaged due to overload, and large noise is prevented, so that the controlled speed reduction braking effect of the track vehicle is realized. The speed reduction device is externally arranged on the track vehicle, the self-weight of the track vehicle is further reduced, the installation difficulty is reduced, and the operation cost is reduced.

Description

Technical Field

[0001] This application relates to the field of braking technology for high-speed rail photography equipment, and more specifically, to a deceleration method for a deceleration device used in a rail photography vehicle. Background Technology

[0002] In live television broadcasts of major sporting events, high-speed track camera vehicles are frequently used to capture details of athletes' high-speed movements. These devices must exceed the athletes' speeds, sometimes reaching 90 kilometers per hour, to meet the requirements of program production. Due to competition rules and venue limitations, the track vehicle must reach the finish line at full speed, while the distance for deceleration and braking is very limited. Therefore, the methods for safely stopping high-speed track camera vehicles vary. The key is to protect the onboard filming and transmission equipment from overload, prevent excessive noise, and avoid threatening the safety of athletes and spectators. Because older high-speed track camera vehicles had a very small contact area between the wheel system and the track, resulting in a very low coefficient of friction, simply relying on the vehicle's own deceleration is insufficient; external hardware assistance is required. The main deceleration method is a permanent magnet eddy current deceleration device, which utilizes the principle of eddy current loss to absorb power. This requires installing large magnetic conductors on the track vehicle and magnetic induction plates for eddy current braking areas on both sides of the track. Precise installation and fitting are necessary to control the effective distance of the magnetic field induction, thereby achieving the best deceleration effect. This proposed solution will significantly increase labor and material costs compared to the current solution, and the weight of the railcar will increase greatly, severely affecting the acceleration and deceleration efficiency of the railcar in the non-eddy current section. Summary of the Invention

[0003] This application provides a deceleration method for a deceleration device for a track photography vehicle, in order to solve the problems of high operating costs of existing deceleration devices and the impact of increased track vehicle weight on acceleration and deceleration efficiency.

[0004] To achieve the above objectives, this application provides the following technical solution:

[0005] A method for decelerating a deceleration device for a track photography vehicle, the deceleration device for the track photography vehicle includes a speed detection component and a braking component, the speed detection component is used to detect the initial speed of the track vehicle entering the braking section; the braking component includes a brake element and an arresting cable assembly, the arresting cable assembly is used to intercept the track vehicle; the brake element is connected to the arresting cable assembly to transmit torque, the brake element is used to generate braking torque;

[0006] The method includes:

[0007] Obtain the initial speed of the railcar as it enters the braking phase;

[0008] The braking torque is calculated based on the initial speed, and the braking torque is output to the braking component.

[0009] The braking component drives the arresting cable assembly to decelerate and brake the railcar according to the braking torque.

[0010] Optionally, before calculating the braking torque based on the initial speed, the method further includes:

[0011] Determine whether the railcar is in contact with the arresting cable assembly. If so, calculate the initial delay based on the initial speed and apply the delay based on the initial delay.

[0012] Optionally, calculating the braking torque based on the initial speed specifically includes:

[0013] The initial delay distance is obtained based on the initial velocity and the initial delay amount;

[0014] The remaining safe distance after the delay is calculated based on the preset safe distance and the initial delay distance;

[0015] The uniform deceleration curve is calculated based on the initial speed and the remaining safe distance, and the braking torque is calculated based on the uniform deceleration curve.

[0016] Optionally, the arresting cable assembly includes:

[0017] Two rollers, the axes of which are collinear and the two rollers are provided with a predetermined interval along the axial direction;

[0018] The arresting cable is wound around the two rollers at both ends.

[0019] Optionally, the arresting cable assembly further includes:

[0020] A steering mechanism is fixed relative to the axis of the drum, and the arresting cable is wound around the steering mechanism. The steering mechanism changes the arresting cable from a vertical state to a horizontal state.

[0021] Optionally, the braking element includes:

[0022] A magnetic powder brake and a magnetic powder brake actuator, wherein the magnetic powder brake is coaxially connected to the two rollers to transmit braking torque; and the magnetic powder brake actuator is connected to the magnetic powder brake.

[0023] Optionally, the deceleration device for the track photography vehicle further includes a position sensor assembly fixed on the roller, the position sensor assembly being used to detect the position of the track vehicle.

[0024] Optionally, the speed detection component is a laser speed sensor.

[0025] Optionally, the deceleration device for the track photography vehicle also includes a supercapacitor and a track brake assembly;

[0026] The track brake assembly is located below the track vehicle and is used to hold the track vehicle and the running track tightly together; the track brake assembly is connected to the supercapacitor, and the supercapacitor is used to supply power to the track brake assembly.

[0027] The method further includes:

[0028] Determine whether a system power failure signal or a braking signal has been received. If so, control the supercapacitor to supply power to the track brake assembly.

[0029] Optionally, the track brake assembly includes:

[0030] A push rod motor and a track clamping mechanism are provided. The electric push rod of the push rod motor is connected to the track clamping mechanism to push the track clamping mechanism to clamp the running track.

[0031] The deceleration method of the deceleration device for a track photography vehicle provided in this application embodiment has the following technical advantages compared with the prior art:

[0032] The deceleration device for the track-mounted photography vehicle employs a speed detection component and a braking component. When the track-mounted vehicle enters the braking section, the speed detection component detects its initial speed and calculates the braking torque based on this initial speed. The braking torque is then output to the braking components, which generate the braking torque and transmit it to the arresting cable assembly, thereby decelerating the track-mounted vehicle by intercepting it. It can be understood that this application achieves deceleration and braking of the high-speed track-mounted vehicle through an external arresting cable assembly and speed detection component. Different braking torques can be output based on the initial speed of different track-mounted vehicles entering the braking section, ensuring a uniform load when the track-mounted vehicle and the arresting cable assembly contact, preventing damage to the track-mounted vehicle and its onboard equipment due to overload, and further preventing excessive noise. This achieves controlled deceleration and braking of the track-mounted vehicle. Furthermore, the aforementioned deceleration device is externally mounted on the track-mounted vehicle, further reducing its weight, installation difficulty, and operating costs. Attached Figure Description

[0033] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0034] Figure 1 A schematic flowchart illustrating a deceleration method for a deceleration device for a track photography vehicle, provided in an embodiment of this application;

[0035] Figure 2 This is a schematic diagram of the structure of the deceleration device for the track photography vehicle provided in the embodiments of this application;

[0036] Figure 3A schematic diagram of the installation structure of the track brake assembly provided in the embodiments of this application;

[0037] Figure 4 This is a schematic diagram of the track brake assembly provided in an embodiment of this application.

[0038] The following labels are shown in the attached diagram:

[0039] 1. Railcar, 2. Rail brake assembly, 3. Railcar ground control unit, 4. Barrier cable, 5. Magnetic powder brake, 6. Magnetic powder brake driver, 7. Speed ​​detection assembly, 8. Roller, 21. Push rod motor, 22. Rail clamping mechanism. Detailed Implementation

[0040] This invention discloses a deceleration method for a deceleration device used in a track photography vehicle, in order to solve the problems of high operating costs of existing deceleration devices and the impact of increased track vehicle weight on acceleration and deceleration efficiency.

[0041] To make the technical solutions and advantages of the embodiments of this application clearer, the exemplary embodiments of this application will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not an exhaustive list of all embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0042] Please see Figure 1-4 , Figure 1 A schematic flowchart illustrating a deceleration method for a deceleration device for a track photography vehicle, provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of the deceleration device for the track photography vehicle provided in the embodiments of this application; Figure 3 A schematic diagram of the installation structure of the track brake assembly provided in the embodiments of this application; Figure 4 This is a schematic diagram of the track brake assembly provided in an embodiment of this application.

[0043] In one specific embodiment, the deceleration device for a track photography vehicle provided in this application includes a speed detection component 7, a braking component, and a control component. The control component is preferably a track vehicle ground control unit 3 (MCU) mounted on the track vehicle 1 to simplify the device structure and connection relationships. The speed detection component 7 and the braking component are preferably externally mounted on the track vehicle 1. Specifically, the speed detection component 7 and the braking component are located at the end of the track, and can be detachably and fixedly connected to the track for easy assembly and disassembly. Further, the speed detection component 7 is used to detect the initial speed of the track vehicle 1 entering the braking section. It is understood that the track vehicle 1 brakes and decelerates according to the MCU control signal. A braking safety distance is provided on the track, which can be set to 10-20m. The speed detection component 7 is preferably located at the initial endpoint of the braking safety distance to detect the initial speed of the track vehicle 1 entering the braking safety distance. It is understood that the track vehicle 1 can receive a braking signal and decelerate before entering the braking safety distance, or it can brake and decelerate simultaneously with entering the braking safety distance, both of which are within the scope of protection of this application.

[0044] The braking assembly includes a brake element and an arresting cable 4 assembly. The brake element is connected to the MCU signal for signal transmission, such as braking torque. The arresting cable 4 assembly is used to intercept the railcar 1, and its position is preferably set on both sides of the track in the width direction. The arresting cable 4 assembly is connected to the brake element to transmit torque.

[0045] Based on the aforementioned deceleration device for track photography vehicles, the deceleration method of this application includes:

[0046] S11: Obtain the initial speed of track car 1 when it enters the braking section;

[0047] S12: Calculate the braking torque based on the initial speed and output the braking torque to the braking component;

[0048] S13: The braking components drive the arresting cable 4 assembly to decelerate and brake the railcar 1 according to the braking torque.

[0049] When braking torque is output to the braking component, after the railcar 1 contacts the arresting cable 4 assembly, the braking component, based on the output braking torque, drives the arresting cable 4 assembly to intercept and brake the railcar 1. It is understood that the deceleration method can be implemented through the aforementioned control components, such as the railcar ground control unit 3. Preferably, the braking section is generally located at the end of the track and is a section of track with a preset distance; the length of the braking section can be equal to the braking safety distance. Based on the initial speed of the railcar 1 entering the braking section, the MCU calculates the braking torque and outputs it to the braking component. The braking component operates according to the braking torque to drive the arresting cable 4 assembly connected to the braking component to intercept and brake the railcar 1.

[0050] The deceleration method of the deceleration device for a track photography vehicle provided in this application embodiment has the following technical advantages compared with the prior art:

[0051] The deceleration device for the track-mounted photography vehicle employs a speed detection component 7 and a braking component. When the track vehicle 1 enters the braking section, the speed detection component 7 detects the initial speed of the track vehicle 1 entering the braking section and calculates the braking torque based on the initial speed. The braking torque is then output to the braking component, which generates the braking torque and transmits it to the arresting cable 4 component, thereby decelerating the track vehicle 1 by intercepting it through the arresting cable 4 component. The speed detection component 7 can be configured as a laser speed sensor, which is accurate and easy to set, reducing operating costs. It is understood that in this application, the deceleration and braking of the high-speed track vehicle 1 are achieved through the external arresting cable 4 component and the speed detection component 7. Different braking torques can be output according to different initial speeds of the track vehicle 1 entering the braking section, ensuring a uniform load when the track vehicle 1 and the arresting cable 4 component contact, preventing damage to the track vehicle 1 and its onboard equipment due to overload, and further preventing excessive noise. This achieves controlled deceleration and braking of the track vehicle 1. Furthermore, the aforementioned deceleration device is externally mounted on the track vehicle 1, further reducing the weight of the track vehicle 1, simplifying installation, and lowering operating costs.

[0052] Specifically, prior to S12, the method further includes:

[0053] S14: Determine whether the railcar 1 is in contact with the barrier cable 4 assembly. If so, proceed to the next step.

[0054] S15: Calculate the initial delay amount based on the initial speed, and perform a delay based on the initial delay amount.

[0055] The determination of contact between railcar 1 and the arresting cable 4 assembly can be monitored by setting sensors, such as position sensors or pressure sensors, which can be configured as needed. The initial delay is the delay before the MCU outputs the PWM signal. The length of the delay is inversely proportional to the initial speed, ensuring that at the instant railcar 1 contacts the arresting cable 4, the braking components are in a state of no resistance, and the force on railcar 1 is only the rotational inertia of the arresting cable 4 roller 8 and the mass of the arresting cable 4. This minimizes the instantaneous force on railcar 1, preventing instantaneous overload and excessive noise, while ensuring full contact between railcar 1 and the arresting cable 4 assembly. Specifically, this can be calculated based on a pre-stored linear function of the initial speed and the delay.

[0056] In one embodiment, calculating the braking torque based on the initial speed specifically includes:

[0057] The initial delay distance is obtained based on the initial velocity and the initial delay amount;

[0058] Calculate the remaining safe distance after the delay based on the preset safe distance and the initial delay distance;

[0059] The uniform deceleration curve is calculated based on the initial speed and remaining safe distance, and the braking torque is then calculated based on the uniform deceleration curve. The uniform deceleration curve is a curve showing the change in speed over time. The real-time speed is obtained from the uniform deceleration curve, the MCU calculates the braking torque, and outputs a PWM signal to the braking device in real time for braking.

[0060] Specifically, the barrier cable 4 assembly includes two rollers 8 and a barrier cable 4. The two rollers 8 are arranged with their axes collinear and have a preset interval along the axial direction. This preset interval can be set with reference to the width of the railcar 1. The two ends of the barrier cable 4 are respectively wound around the two rollers 8. The barrier cable 4 corresponding to the preset interval between the two rollers 8 serves as the main force-applying part for intercepting the railcar 1. The barrier cable 4 is a flexible rope made of low-elasticity polymer material, and its two ends are respectively wound around the rollers 8 for at least 20m. The barrier cable 4 assembly also includes a steering mechanism, which is fixed relative to the axis of the roller 8. The steering mechanism can be configured as a guide wheel, specifically including a first guide wheel and a second guide wheel. Preferably, the first guide wheel and the second guide wheel are arranged in a direction perpendicular to the axis of each roller 8, and the line connecting the first guide wheel and the second guide wheel is arranged perpendicular to the axis of the roller 8. At the same time, the line connecting the first guide wheel and the second guide wheel is arranged in a horizontal direction. The first guide wheel is arranged on the side closer to the roller 8, and the second guide wheel is arranged on the side farther away from the roller 8. The barrier cable 4 is routed from one side of the roller 8 and the steering mechanism to the other side of the steering mechanism and the roller 8. Specifically, the barrier cable 4 is extended vertically through the first guide wheel, and the barrier cable 4 is stretched horizontally by a preset distance through the second guide wheel, so that the barrier cable 4 between the opposing second guide wheels of the two rollers 8 is arranged in a horizontal state. It can be understood that the steering mechanism is set higher than the roller 8. The first guide wheel and the second guide wheel can be fixed to the ground through a bracket. This can be set according to the existing technology, which will not be elaborated here.

[0061] To determine the contact state between the track vehicle 1 and the arresting cable 4, the aforementioned deceleration device for the track photography vehicle also includes a position sensor assembly fixed to the roller 8 to detect the position of the track vehicle 1. When the position sensor detects the position signal of the track vehicle 1, it sends it to the MCU. Upon receiving the position signal, the MCU considers that the track vehicle 1 and the arresting cable 4 assembly are in contact and can calculate the initial delay based on the initial speed. When the track vehicle 1 reaches the arresting cable 4, the arresting cable 4 initially contacts the front of the track vehicle 1, causing a corresponding change in the rotation angle of the roller 8 of the arresting cable 4. The position sensor detects the rotation angle of the roller 8 and transmits the position signal to the MCU.

[0062] In one embodiment, the braking component includes a magnetic powder brake 5 and a magnetic powder brake actuator 6. The magnetic powder brake 5 is coaxially connected to two rollers 8 to transmit braking torque. The arresting cable 4 rollers 8 are coaxially mounted with the magnetic powder brake 5. The magnetic powder brake 5 generates braking torque to control the rollers 8 to release the arresting cable 4 in an orderly manner, enabling the railcar 1 to achieve controlled deceleration and braking. The magnetic powder brake actuator 6 is connected to the magnetic powder brake 5. The magnetic powder brake actuator 6 is connected to an MCU, which receives PWM signals and outputs corresponding current to drive the magnetic powder brake 5 to generate braking torque.

[0063] Based on the above embodiments, when the track photography vehicle is driven by a linear motor, the greatest risk comes from emergency deceleration of the system. Due to the limitations of the competition format and venue, the track vehicle 1 must reach the finish line at full speed, while the distance for deceleration and braking is very limited. Normal braking of the system is achieved by the linear motor generating a reverse magnetic field. However, the power supply of the linear motor needs to feed the driving energy from the ground to the track vehicle 1 through a sliding contact line. If the power supply system malfunctions, the entire system will be in a high-speed, uncontrolled state. To ensure the normal operation of the MCU and track brake assembly 2 on the vehicle after a power outage due to a failure of the emergency braking system - external power supply system, the aforementioned deceleration device for the track photography vehicle also includes a supercapacitor. When the track vehicle ground control unit 3 detects a power outage, it supplies power to the track vehicle ground control unit 3 and the track brake assembly 2. The track brake assembly 2 is located below the track vehicle 1 to hold the track vehicle 1 and the running track tightly, thereby further improving the deceleration and braking effect of the deceleration device and preventing the track photography vehicle from being in a high-speed running out-of-control state due to a failure of the linear motor power supply system. The braking and deceleration are also carried out in conjunction with the arresting cable 4 assembly to further ensure that the on-board shooting equipment and transmission equipment will not be overloaded, prevent the generation of huge noise, and ensure the safety of athletes and spectators.

[0064] Specific deceleration methods also include:

[0065] Determine if a system power failure signal or braking signal has been received. If so, proceed to the next step.

[0066] The supercapacitor controls the power supply to the track brake assembly 2 and the track vehicle ground control unit 3.

[0067] Compared to ordinary batteries, supercapacitors offer several advantages: Shorter charging time (complete charging within seconds of powering on the track vehicle 1, allowing the emergency braking system to activate immediately); smaller size and lighter weight (facilitating installation inside the track vehicle 1 and reducing overall weight); and longer lifespan (capacitors can be charged and discharged more times than batteries).

[0068] In one embodiment, the track clamping assembly 2 includes a push rod motor 21 and a track clamping mechanism 22. The push rod motor 21 is connected to the track vehicle ground control unit 3. According to the control signal, it pushes the track clamping mechanism 22 to clamp the running track, thereby achieving clamping between the track vehicle 1 and the running track. The track clamping mechanism 22 can be configured as a brake pad. Specifically, the track clamping mechanism 22 is configured as a U-shaped structure, which cooperates with the running track. Brake pads are respectively provided on both sides of the U-shaped structure. The brake pads are pushed by an electric push rod to move towards the running track, so that the brake pads and the running track come into contact.

[0069] In one specific implementation, this application actively determines the speed at which the railcar 1 enters the braking section and uses current to control the magnetic powder brake 5 to generate a corresponding braking torque, thereby enabling the high-speed railcar 1 to stop within the braking safety distance and below its maximum deceleration. Generally, the braking safety distance is 20m, the railcar 1 weighs 150kg, the maximum speed of the railcar 1 is 25m / s, and it can withstand a maximum overload of 1.5G.

[0070] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0071] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A deceleration method for a deceleration device used in a track photography vehicle, characterized in that, The deceleration device for the track photography vehicle includes a speed detection component and a braking component. The speed detection component is used to detect the initial speed of the track photography vehicle when it enters the braking section. The braking component includes a brake element and a stop cable assembly, which is used to intercept the track photography vehicle. The braking element is connected to the arresting cable assembly to transmit torque, and the braking element is used to generate braking torque. The method includes: Obtain the initial speed of the track camera vehicle as it enters the braking phase; The braking torque is calculated based on the initial speed, and the braking torque is output to the braking component. The braking component drives the arresting cable assembly to decelerate and brake the track photography vehicle according to the braking torque; Before calculating the braking torque based on the initial speed, the method further includes: Determine whether the track camera vehicle is in contact with the barrier cable assembly. If so, calculate the initial delay based on the initial speed and perform a delay based on the initial delay. The calculation of braking torque based on the initial speed specifically includes: The initial delay distance is obtained based on the initial velocity and the initial delay amount; The remaining safe distance after the delay is calculated based on the preset safe distance and the initial delay distance; The uniform deceleration curve is calculated based on the initial speed and the remaining safe distance, and the braking torque is calculated based on the uniform deceleration curve.

2. The deceleration method for the deceleration device of the track photography vehicle according to claim 1, characterized in that, The arresting cable assembly includes: Two rollers, the axes of which are collinear and the two rollers are provided with a predetermined interval along the axial direction; The arresting cable is wound around the two rollers at both ends.

3. The deceleration method for the deceleration device of the track photography vehicle according to claim 2, characterized in that, The arresting cable assembly also includes: A steering mechanism is fixed relative to the axis of the drum, and the arresting cable is wound around the steering mechanism. The steering mechanism changes the arresting cable from a vertical state to a horizontal state.

4. The deceleration method for the deceleration device of the track photography vehicle according to claim 3, characterized in that, The braking component includes: A magnetic powder brake and a magnetic powder brake actuator, wherein the magnetic powder brake is coaxially connected to the two rollers to transmit braking torque; and the magnetic powder brake actuator is connected to the magnetic powder brake.

5. The deceleration method for the deceleration device of the track photography vehicle according to claim 2, characterized in that, The deceleration device for the track photography vehicle also includes a position sensor assembly fixed on the roller, which is used to detect the position of the track photography vehicle.

6. The deceleration method for the deceleration device of the track photography vehicle according to claim 4, characterized in that, The speed detection component is a laser speed sensor.

7. The deceleration method for the deceleration device of the track photography vehicle according to any one of claims 1-6, characterized in that, The deceleration device for the track photography vehicle also includes a supercapacitor and a track brake assembly; The track-holding brake assembly is located below the track-mounted camera vehicle and is used to hold the track-mounted camera vehicle and the running track tightly together. The track brake assembly is connected to the supercapacitor, and the supercapacitor is used to power the track brake assembly. The method further includes: Determine whether a system power failure signal or a braking signal has been received. If so, control the supercapacitor to supply power to the track brake assembly.

8. The deceleration method for the deceleration device of the track photography vehicle according to claim 7, characterized in that, The track brake assembly includes: A push rod motor and a track clamping mechanism are provided. The electric push rod of the push rod motor is connected to the track clamping mechanism to push the track clamping mechanism to clamp the running track.

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