JPH0223602Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is based on the level of railway tracks (including cant).
This invention relates to a track leveling device that can also be used as a tester to measure voltage, current, resistance, etc., as needed.

In recent years, the mechanization of railway track maintenance work has progressed, and various types of track maintenance machines have come into widespread use. In addition, the electrification and computerization of track maintenance machines is progressing, and track maintenance machines are becoming more and more complex.

On the other hand, for track maintenance work, it is essential to measure the level of the track, so a level measuring device must be carried at all times, but at the same time, a tester for maintenance and inspection of track maintenance machinery must also be carried. In the past, a bubble level was often used to determine the position and level of bubbles, but the tester was made separately from the level, so the level and tester had to be carried separately. It was a hassle to transport.

The present invention was developed in view of these circumstances, and incorporates a tester for measuring voltage, current, resistance, etc. into a level measuring device that is essential for track maintenance work, and organically combines the two to create an electronic circuit. To provide a track level measuring device that can also be used as a tester and has a simplified circuit configuration by using a part of the circuit for both the level measuring device and the tester.

In order to achieve this purpose, the present invention includes a measuring bar incorporating a level, a display box formed separately from the measuring bar and connected to the level by a removable electric cable, and a display box attached to one end. A tester cable to which a probe is attached and which is detachable from the display box is provided, and the display box includes an arithmetic circuit that calculates a level value based on the output of the level, and a tester cable that measures at least one of voltage, current, and resistance. A tester circuit for
A display circuit is provided which is connected to the arithmetic circuit and the tester circuit via a selection switch and provides a digital display based on the output of the arithmetic circuit or the tester circuit.
The present invention will be explained in detail below based on the illustrated embodiments.

FIG. 1 is an overall view of an embodiment of the present invention, and FIG. 2 is an electrical circuit diagram thereof. In FIG. 1, reference numeral 10 is an inspection bar, and a pair of left and right pedestals 12, 12a, 12
b, and a connecting bar 14 that rigidly connects these. The cradle 12a, 12b is placed on a pair of left and right railway tracks 16, 16a, 16b. pedestal 1
A spirit level 18 is attached within the cradle 2b, and a socket 20 is attached to the upper surface of the pedestal 12b.

22 is a display box, 24 is a socket of this display box 22, and 26 is an electric cable, the plugs 28, 28a, 28b at both ends of which can be connected to the sockets 20, 24.

A tester cable 30 has a plug 32 connectable to the socket 24 at one end, and a probe (contact) 34 at the other end.

As shown in FIG. 2, the display box 22 has an arithmetic circuit 36 for determining a level value, a tester circuit 38, a display circuit 40, and a selection switch 42. In the arithmetic circuit 36, 36a is a low-pass filter that removes noise consisting of high frequency components contained in the analog voltage signal output from the level gauge 18. Further, 36b is a differential amplifier, and 36c is a variable resistor as a zero adjuster. Differential amplifier 3
The output voltage of the level gauge 18 after passing through the low-pass filter 36a and the output voltage of the zero regulator 36c are input to 6b. This differential amplifier 36b amplifies the difference between these two voltages.

The selection switch 42 is of a double rotary type and includes switches 42a and 42b. The selection switch 42 is used to select the measurement mode, and the scale C
Measure the level by using the DCV scale, AC voltage with the ACV scale, DC current with the DCI scale, and resistance with the Ω scale.

The tester circuit 38 is connected between each terminal of both switches 42a and 42b, and has a rectifier 38a and level conversion resistors 38b and 38c.

The display circuit 40 includes an A/D converter 40a that converts the output voltage of the mode selected by the selection switch 42 into a BCD code digital signal, and this BCD code.
a decoder 40b that converts the code into a decimal number;
It has a display 40c, such as an LED, in which numbers made up of 7 segments are arranged in multiple digits. The display 40c also displays C, DCV, ACV, DCI, and Ω in response to the selection of the selection switch 42.

Further, in FIG. 2, 44 is a battery, and 46 is a measurement switch. By pressing the switch 46, power is supplied to each electric circuit component, and the measurement results are digitally displayed on the display 40c.

Next, the operation of this embodiment will be explained. When measuring the level, connect the inspection bar 10 to the display box 22 with the cable 26, set the selection switch 42 to scale "C", press the measurement switch 46 with the inspection bar 10 horizontal, and turn the display on. Adjust the zero adjuster 36c so that the display at 40c becomes "0". Then, when the measurement bar 10 is placed on the track 16 and the measurement switch 46 is pressed again, the level 18 outputs a voltage according to the inclination, so the level value at that location is displayed on the display 40c along with the positive and negative signs. be done.

When used as a tester, the tester cable 30 is connected to the display box 22, and the selection switch 42 is switched to a scale corresponding to the object to be measured. Then, the probe 34 is brought into contact with the measurement site and the measurement switch 46 is pressed. Voltage and current at the measurement site,
The voltage indicating the resistance is digitally converted by the display circuit 40, and the numerical value is displayed on the display 40c.

Although the tester of this embodiment is capable of measuring four types of DC voltages, including DCV, it goes without saying that any device that can measure at least one of these voltages is included in the present invention. Also, the tester circuit 38
are resistors 38b and 38c for voltage level conversion.
Of course, it is also possible to provide a level changeover switch so that the measurement range can be changed stepwise to expand or contract the measurement range.

In this way, the present invention provides a level measuring device with a tester circuit and allows it to be used as a tester by operating the selection switch, so there is no need to carry a separate tester during track maintenance work. Furthermore, since the display circuit can be shared by both the level measuring device and the tester, the circuit configuration becomes relatively simple.

[Brief explanation of the drawing]

FIG. 1 is an overall diagram of an embodiment of the present invention, and FIG. 2 is a circuit diagram thereof. 10...Measuring bar, 18...Level, 22...
Display box, 26...Electric cable, 30...Tester cable, 34...Probe, 36...Arithmetic circuit, 38...Tester circuit, 40...Display circuit, 4
2...Selection switch.

Claims (1)

[Scope of utility model registration request] A measuring bar incorporating a level, a display box formed separately from the measuring bar and connected to the level by a removable electric cable, and a probe attached to one end and detachable from the display box. The display box includes an arithmetic circuit that calculates the level value based on the output of the level device, and a voltage/voltage tester cable.
A tester circuit for measuring at least one of current and resistance, and a display circuit that is connected to the arithmetic circuit and the tester circuit via a selection switch and displays digitally based on the output of the arithmetic circuit or the tester circuit, and is used as a tester. A track leveling device that can also be used as a tester.