JPS6117042Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a railway track clearance management data collection device.

The amount of clearance at the rail joint changes depending on the temperature of the rail. If the amount of clearance is too small, it may cause a rail overhang accident, and if it is too large, the impact when a vehicle passes is large, promoting joint failure, and damaging the rail joint plate.
This may cause the bolts that tighten the joint plates to break.
Rails that are actually laid are generally restrained by joint plates, fastening devices, trackbeds, etc., so they cannot freely expand and contract. Therefore, as opposed to the free expansion and contraction characteristic A shown in FIG. 1, the actual expansion and contraction characteristic of the rail becomes a hysteresis characteristic as shown in B. Therefore, even under the same temperature, the amount of clearance changes when the temperature is rising and when the temperature is falling. Therefore, to find the appropriate amount of free space, measure the temperature and free space when the temperature rises and falls.
It is necessary to compare this actual measurement value with the planned clearance amount to determine suitability. Therefore, it is necessary to actually measure the data related to the rail temperature and the amount of clearance over a period of time corresponding to at least one cycle of the hysteresis characteristic, that is, 24 hours.

Conventionally, a simple thermometer was placed on the rail surface and the reading was read at regular intervals, and the amount of clearance at that time was measured using a scale, or a temperature sensor and recorder were used to measure the rail temperature. Although it is conceivable to automate this process, manual effort is required to measure the amount of free space. However, since the amount of free space is related to temperature changes throughout the day and night, it varies depending on the season and region, so collecting data regarding the amount of free space requires a huge amount of manpower.

The purpose of this invention is to provide a railway track clearance management data collection device that can automatically collect data regarding rail temperature and clearance amount.

An embodiment of this invention will be described below in detail with reference to the drawings.

Figure 2 shows an example of the appearance of this invention. That is, the catchers 1a and 1b are fixed at positions equidistant from the joint of the rails with the joint as the center. The catchers 1a, 1b are securely fixed by tightening bolts. A temperature sensor 2 is attached to one catcher 1a. This temperature sensor 2
For example, a temperature measuring resistor or a thermistor can be used, and it is configured to be pressed into contact with the underside of the rail neck from the catcher 1a by, for example, a screw feeding mechanism. A clearance sensor 3 is housed in the other catcher 1b. The free space sensor 3 can be constituted by, for example, a potentiometer or a differential transformer, and the movable part of the potentiometer or differential transformer is always moved in one direction by a mainspring or a spring. The wire 4 is extended from the mover, and the end of the wire 4 is attached to the other catcher 1a. With this configuration, the amount of play of the wire 4 changes as the amount of play at the joint changes, and this moves the movable part of the potentiometer or the differential transformer, making it possible to detect changes in the amount of play.

Detection signal of temperature sensor 2 and clearance amount detection sensor 3
The detection signal is input to the data storage device 7 through cables 5 and 6.

The data storage device 7 can be configured as shown in FIG. 3, for example. In FIG. 3, reference numeral 2 indicates a rail temperature sensor, and reference numeral 3 indicates a clearance sensor at the joint. Detection signals from these sensors 2 and 3 are input to data storage device 7 through connectors 8 and 9. The data storage device 7 has a preamplifier 1
The preamplifiers 11 and 12 amplify the detection signals output from the sensors 2 and 3 to a required level. One and the other of the amplified outputs are alternately selected by the switching circuit 13 and input to the sample hold circuit 14. The sample and hold circuit 14 outputs, for example, 60
The rail temperature detection signal and clearance amount detection signal are sampled and held every minute, the sampled and held values are subjected to A-D conversion in an A-D converter 15, and the converted output is stored in a memory 16. 17
indicates an address counter that specifies the write position of this memory 16, and this address counter 17 increments by 1 every time a hold command is given to the sample hold circuit 14, and increments the write position of the memory 16 by one address. advance. Therefore, temperature data and free space data are alternately stored in the memory 16 for each address.

Reference numeral 18 indicates a control signal generation circuit for controlling the operation of this data storage device 7. This circuit 18
For example, the clock signal source 19, the clock intermittent gate circuit 21, the 1/N frequency divider 22, the 1/30 frequency divider 23, the 1/2 frequency divider 24, the memory time selection switch 25, and the waveform conversion. It can be configured by circuits 26 and 27. In other words, the 1/N frequency divider 22 obtains a pulse that changes every minute, and the 1/30 frequency divider 23 divides the pulse that changes every 30 minutes into a signal that changes every 30 minutes. The signal that changes every minute is made into a signal that changes every 60 minutes by the 1/2 frequency divider 24, and the signal that changes every 30 minutes or the signal that changes every 60 minutes is selected by the switch 25. and supplies it to the waveform conversion circuit 26.

The waveform conversion circuit 26 receives a signal that changes every 30 minutes or every 60 minutes, and depending on the change in the signal (rising and falling), controls the switching circuit 13 within a short period of time immediately after the change to generate a temperature detection signal. Control is performed to switch from the state in which the sample and hold circuit 14 is supplied to the state in which the idle amount detection signal is supplied to the sample and hold circuit 14, and to return to the original state, that is, the state in which the temperature detection signal is supplied to the sample and hold circuit 14 as necessary. Get a signal. The waveform conversion circuit 27 obtains a signal for giving a sample and hold command to the sample and hold circuit 14 in synchronization with the switching of the switching circuit 13. Along with this, address counter 1
7 is given a signal to increment the address. In this way, the sample and hold circuit 14
Temperature detection data and free space detection data are sampled and held every 60 minutes within a short period of time, and the sampled and held values are stored in the memory 16.
Therefore, the rail temperature at approximately the same time and the amount of clearance at that time can be stored.

In this invention, a power supply 28 for operating the memory 16 and a power supply 29 for operating other circuits are further separated, and the power supply 28 for operating the memory 16 constantly supplies power to the memory 16 and keeps the memory 16 in an operating state at all times. . On the other hand, the power supply 29 is the switch means 3
1 and 32 to circuits other than the memory 16. The switch means 31 and 32 are connected to the connectors 8 and 9.
The device can be configured to turn on and off in connection with the attachment and detachment of the device. For example, pins 8a-8b, 8c-8d of connectors 8 and 9 as shown in FIG.
, 9a-9b, 9c-9d are connected in series to the power supply path, and these pins 8a-8b, 8c-8d and 9
A-9b and 9c-9d are short-circuited by inserting plugs (not particularly shown) connected to the ends of cables 5 and 6, and DC power from power supply 29 is transferred to memory 16.
It is configured so that it is supplied to other circuits except for.

With this configuration, power is constantly supplied to the memory 16 from the power supply 28, and the memory 16 is retained. Furthermore, by attaching the cables 5 and 6 from the sensors 2 and 3 to the connectors 8 and 9, other circuits except the memory 16 can be supplied with power and put into operation.

This data storage device is installed at the measurement site and stores the rail temperature and the amount of free space under that temperature for 24 to 48 hours. After data collection, it is disconnected from the sensors 2 and 3 and brought back from the site to the memory 16. By reading data from the rail and recording the data on, for example, an X-Y recorder or printer, it is possible to know the rail temperature and the amount of clearance under that temperature.

The data storage device 7 is composed of preamplifiers 11 and 12, a switching circuit 13, a sample and hold circuit 15, a memory 16, etc., so it can be made small. However, since these circuits consume little power, they can be operated sufficiently for about 24 to 48 hours on battery power. Therefore, a data storage device that can be easily installed at the measurement site can be obtained. Furthermore, even if the memory 16 is disconnected from the sensors 2 and 3, the operating power can be continued to be supplied to the memory 16, so that the stored contents will not be erased and the data can be safely brought back from the field. As a result, it becomes easy to collect data regarding the amount of free space, and a large amount of data can be obtained with less manpower, which provides the advantage of facilitating rail maintenance.

[Brief explanation of the drawing]

Fig. 1 is a graph showing the temperature characteristics of the amount of expansion and contraction of the rail, Fig. 2 is a perspective view showing an embodiment of the data collection device according to this invention, and Fig. 3 shows an embodiment of the main parts of the device according to this invention. The system diagram, FIG. 4, is a connection diagram showing an example of the configuration of a switch used in the device of this invention. 2...Rail temperature sensor, 3...Free space sensor, 13...Switching circuit, 16...Memory, 17...
...Address counter, 28...Memory power supply, 2
9...Power supply for operating circuits other than memory, 3
1, 32...Switch means for supplying operating power to circuits other than the memory by connecting a sensor.

Claims (1)

[Scope of utility model registration request] A rail temperature sensor, a clearance sensor, a switching circuit that switches signals from these sensors and supplies them to a common A-D converter, and an A-D converter
a memory for storing converted rail temperature data and free space data; an address counter for accessing this memory; a memory power source for activating the memory; and a power source for activating circuits other than the memory; A railway track clearance management data collection device comprising switch means for supplying power to circuits other than the memory when both of the sensors are connected.