JPS6357722B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for measuring the weight of a running vehicle, in particular,
The present invention relates to a method that has a function of detecting tire flats on the wheels of a running railway vehicle and determining the size thereof, and measuring the vehicle weight with high accuracy.

Since a running railway vehicle causes vertical vibrations, horizontal vibrations, etc., the weight acting on the wheels constantly fluctuates, making it extremely difficult to accurately measure the vehicle weight. When a vehicle is stationary on a flat track, the vehicle weight can be measured relatively accurately because each wheel receives the vehicle's weight evenly, but it is extremely difficult to position the vehicle to stop the wheels at the measurement point. and requires a lot of time and effort.

Furthermore, when there are many vehicles following, it is almost impossible to measure the wheel weight of each vehicle while stopping each wheel at a fixed position and determine the vehicle weight of each vehicle. To overcome the above-mentioned difficulties, a multi-point measurement method has been used in which a measurement section is set up and multiple measurement points are placed within that section so that wheel loads can be measured dynamically. In railway vehicles, abnormal wear (hereinafter referred to as tire flats) may occur on the wheel treads due to wheels sliding when the brakes are applied.As this tire flat hits the rail, the shock wave is superimposed on the wheel load signal, causing the wheel load to increase. The drawback was that it had a negative effect on the measurement accuracy.

Therefore, the present invention removes the noise superimposed on the wheel load signal due to tire flats that occur on the wheel tread, improves the accuracy of wheel load measurement, and calculates the vehicle weight with high accuracy. The wheel load value of each wheel is calculated based on the fact that a running vehicle makes complex movements such as vertical vibration, lateral vibration, rolling, pitching, and yawing due to various spring systems. Since it is not constant at each point in the measurement section, multiple wheel load detectors are installed at predetermined intervals on the track in the vehicle's direction of travel, and the height is calculated by removing the shock wave from the tire flat wheel that is superimposed on the wheel load signals from those detectors. The present invention is characterized in that, in addition to measuring the vehicle weight from accurate wheel weight values, it also detects wheels with flat tires and detects tire flats.

Embodiments of the present invention will be described in detail below with reference to the drawings. The figure is a block diagram of the measuring method according to the invention. A measurement section 2 is provided in the track, and wheel load detectors 3a, 3b, ..., 3n capable of measuring the left and right wheel loads of the vehicle 1 are installed on the rails of the measurement section 2. , 3b, ..., 3n total number n
Place them at equal intervals based on the value divided by . The other rail is shifted by one sleeper from the other rail, and wheel load detectors 3a, 3b, . Furthermore, the measurement section length is determined by the natural vibration of the vehicle 1 and the traveling speed at the time of measurement, and generally requires a distance twice the vehicle length. The wheel load signals from the wheel load detectors 3a, 3b, . Get in,
The AD conversion circuit 6 performs AD conversion, and the measured wheel weight value is stored in the 3-level memory 8 through the memory selection circuit 7. While repeatedly measuring this at each measurement point at time intervals that match the speed of the vehicle, the measured wheel load value is compared with the wheel load value stored in the 3-level memory 8 for each measurement point. If the wheel weight value is larger than any of the wheel weight values stored in the three-level memory 8, the lowest level wheel weight value is rewritten.
By performing the above method for all measurement points,
The three-level memory 8 always stores the top three levels of wheel load values for each measurement point, and after one wheel passes, the first and second wheel load values from the third level to the top three levels are stored. Compare with the third,
If the value is the limit value, compare the first value, if it is outside the limit value, compare the second and third values, if it is the limit value, compare the second value, and if it is outside the limit value, compare the second value. Take the third value and determine whether there is a tire flat,
An accurate wheel load value is determined and stored in the three-level memory 8. The contents of the 3rd level memory 8 are the heavy wheel detector 9
a, 9b..., 9n are read at the timing when each wheel passes, in preparation for the measurement of the next wheel. The measurement interval for each measurement point is determined from the switching time of the analog signal switching circuit 5 and the scanning time for each channel at each measurement point.

This corresponds to the sampling interval. On the other hand, it is assumed that the calibration signal and zero point adjustment are always automatically performed before the vehicle 1 approaches. This is shown by the arrows from the central processing section 10 in the figure to the amplification sections 4a, 4b, . . . , 4n through the control circuit 11.

Next, regarding the wheel load detectors installed in the measurement section 2, the detection range of each wheel load detector 3a, 3b, ..., 3n is considered to be around 200 mm, so this is installed at n points on one side of the rail. There are n detection points (2n detection points in total) on the other rail, and as shown in the figure, the left and right rails are arranged with one sleeper offset, so the wheels roll through this measurement section 2. If the total detection range at each wheel load detection point is greater than or equal to the circumference of the wheel by the time the test is finished, it means that the entire circumference of each wheel has been detected, and no matter where on the wheel there is a tire flat, only one of the measurements will be taken. The shock wave of the tire flat is detected at the point, making it possible to pinpoint the wheel. The water level of tire flats can also be determined from the relationship between shock wave amplitude and wheel load value, which is highly effective in early detection of abnormally worn wheels with large shock waves, damage to tracks and vehicles, and reduction of noise and vibration along railway lines. be.

As described above, according to the present invention, no matter where a tire flat occurs on each wheel of each vehicle, the shock wave caused by the tire flat wheel is removed, the vehicle weight is determined from a highly accurate wheel weight value, and the tire flat is also detected. It is easy to identify the size of a tire flat and the size of a tire flat.

[Brief explanation of the drawing]

The figure shows a block diagram of a tire flat detection type railway vehicle weight measurement method according to the present invention. Explanation of symbols in the figure: 1...Vehicle, 2...Measurement section, 3a, 3b,..., 3n...Wheel load detector, 4
a, 4b,...4n...Amplifier, 5...Analog signal switching circuit, 6...AD conversion circuit, 7...Memory select circuit, 8...3 level memory, 9a, 9
b,...,9n...Wheel detector, 10...Central processing unit, 11...Control circuit.

Claims (1)

[Claims] 1. Set a measurement section on the track, and use multiple wheel load detectors to detect the wheel load of each wheel of the traveling vehicle. The value divided by the total number is installed on one rail at equal intervals, while the other rail is shifted by one sleeper from the rail, and a plurality of wheel load detectors are installed in the same way, so that the measurement area is measured. The wheel load signal from the wheel load detector at each measurement point of the wheel of a running vehicle is amplified by an amplifier, AD converted by an analog signal switching circuit and an AD conversion circuit, and then among the wheel load values measured by a memory selection circuit. , the values of the upper three levels are stored in the three-level memory, and while repeating measurements at time intervals that match the running speed of the vehicle, the measured values are compared with the stored wheel load values and rewritten. After the wheel passes, each value is compared from the wheel weight values in the 3-level memory, and after detecting the shock wave caused by the tire flat wheel, the vehicle weight is determined from the wheel weight value with the shock wave removed. A tire flat type railway vehicle weight measurement method characterized by determining the size of a tire flat from the relationship with a weight value.