JP2002328063A - Pantograph contact force measurement device - Google Patents

Abstract

(57) [Summary] [Problem] Contact force data can be obtained with high accuracy without affecting the original current collection performance of a pantograph.
To provide a reliable and low-cost contact force measuring device. SOLUTION: A strain gauge 2d is attached to a coil spring 2a incorporated in a boat support 2, and an output of the strain gauge 2d is input to a calculator 20. The acceleration of the current collecting boat 1 is measured by an accelerometer 3 provided inside the current collecting boat 1, and the acceleration is input to the arithmetic unit 20. The arithmetic unit 20 is configured to detect the strain gauge 2d.
Is converted into the load of the coil spring 2a.
The contact force acting between the current collector boat 1 and the trolley wire 12 is determined from the load a and the acceleration signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pantograph contact force measuring device for measuring a contact force between a current collector boat and a trolley wire of a vehicle pantograph.

[0002]

2. Description of the Related Art FIG. 4 is a mechanical diagram of the entire pantograph for explaining the operation of the pantograph, and FIG. 5 is a sectional view of a boat and a boat support. 4 and 5, 1 is a current collecting boat, 2 is a boat support, 2a is a coil spring, 2b is a boat support shaft, 2
c is a boat support guide, 5 is an upper frame, 6 is a lower frame, 7 is a balance rod, 8 is a balancing rod, 9 is an underframe, and 10 is an insulator. Reference numeral 11 denotes a vehicle body, and reference numeral 12 denotes a trolley wire. At the time of power collection, the tension of the main spring (not shown) inside the underframe 9 is increased by the link mechanism of the upper frame 5, the lower frame 6, the balance rod 7, and the balancing rod 8 to support the boat support 2 above the upper frame 5. A constant pushing force is applied to the trolley wire 12 of the current collector boat 1 via the trolley wire 12. A coil spring 2a is incorporated in the boat support 2 in order to improve the ability to follow the trolley wire 12.

FIG. 6 is an explanatory view of a conventional contact force measuring method. In FIG. 6, reference numerals 3, 3 'denote accelerometers, 4a and 4b denote signal lines, and 13 denotes a load cell. The acceleration in the vertical direction of the current collecting boat 1 is measured by the accelerometers 3 and 3 'attached inside the current collecting boat 1. The load cell 13 is mounted below the coil spring 2a in the boat support 2, and measures a vertical load acting between the current collector boat 1 and the boat support 2. The acceleration signal and the load signal are sent to a calculator 20 attached to the vehicle body, and the contact force between the current collector boat 1 and the trolley wire 12 is calculated. FIG. 7 is an explanatory diagram of another conventional contact force measuring method. In FIG. 7, 3, 3 'are accelerometers, 4a and 4b are signal lines, 15 is a displacement meter, and 16 is a displacement meter mounting base. The acceleration in the vertical direction of the current collecting boat 1 is measured by the accelerometers 3 and 3 'attached inside the current collecting boat 1. The displacement gauge 15 is composed of the current collecting boat 1 and the boat support 2
The vertical displacement between the current collecting boat 1 and the boat support 2 is measured. The acceleration signal and the displacement signal are sent to a calculator 20 attached to the vehicle body, and the displacement signal is converted into a vertical load acting between the current collector boat and the boat support based on the relationship between the displacement of the coil spring and the load. Boat 1 and trolley line 1
Calculate the contact force between the two.

[0004]

In the conventional contact force measuring method shown in FIG. 6, since the load cell 13 must be incorporated in the boat support 2, the boat support 2 is designed exclusively and the entire boat support becomes large. Mass also increases. This affects the aerodynamic characteristics and follow-up characteristics of the pantograph, resulting in data different from the original contact force of the pantograph to be measured. Further, in the conventional contact force measuring method shown in FIG. 7, the displacement gauge 15 is attached to the outside of the boat support 2, which also affects the aerodynamic characteristics and the follow-up characteristics of the pantograph, and the contact force of the original pantograph to be measured is also measured. Will be different data. Further, in both of the conventional methods, the structure of the boat support is complicated, and the reliability is reduced and the cost is high. The present invention solves such problems of the conventional technology, and can obtain accurate contact force measurement data without affecting the original performance of the pantograph, and provides a reliable and low-cost contact force measurement device. It is an object to provide a force measuring device.

[0005]

In order to solve the above problems, the present invention provides an accelerometer inside a current collecting boat for detecting the vertical acceleration of the current collecting boat. In order to detect the vertical load acting between the supports, a strain gauge is attached to a coil spring incorporated in the boat support, and the strain is measured. Then, the strain measured by the strain gauge and the acceleration measured by the accelerometer are input to a calculator. The computing unit determines a vertical load acting between the current collector boat and the boat support from the strain measured by the strain gauge and a relationship between the strain and the load determined in advance, and calculates the vertical load and the accelerometer. The contact force of the pantograph is obtained from the acceleration measured by the above. In the present invention, as described above, the strain gauge is provided on the coil spring incorporated in the boat support, and the vertical load acting between the current collector boat and the boat support is determined. , Little change in mass. For this reason, there is no influence on the aerodynamic characteristics and the follow-up characteristics of the pantograph, and the original contact force data of the pantograph to be measured can be obtained. Further, since the structure is simple, high reliability and low cost can be achieved.

[0006]

FIG. 1 is a diagram showing the configuration of a contact force measuring device according to an embodiment of the present invention. In FIG. 1, the same components as those shown in FIG. 4 are denoted by the same reference numerals, 1 is a current collection boat, 2a is a coil spring provided in the boat support, 2b is a boat support shaft, 2c Is a boat support guide,
3, 3 'are accelerometers provided inside the collecting boat, 4a, 4
b is a signal line, and 20 is a computing unit. FIG. 2 is a cross-sectional view of the coil spring 2a inside the boat support 2 to which a strain gauge is attached, and FIG. 3 is a diagram illustrating a state where the strain gauge is attached to the coil spring 2a. As shown in FIG. 3, two strain gauges 2d are attached so as to intersect at 45 ° with respect to the tangential direction of the coil spring 2a so that the shear stress acting on the coil spring 2a can be measured. Attach to the upper two places. The strain gauge 2d is desirably attached on a spring between coil springs as shown in FIG. 2 and FIG. 3 in order to avoid breakage of contact with the boat support shaft 2b.
Also, in order to avoid the influence of noise and the like, a Wheatstone bridge is connected near the coil spring to measure the distortion.

The output of the strain gauge 2d is input to a calculator 20 via a signal line 4b as shown in FIG. The accelerations ω1 and ω2 of the current collector measured by the accelerometers 3 and 3 ′ provided inside the current collector are input to the arithmetic unit 20 via the signal line 4a. The force received from the trolley wire 12 is transmitted to the coil spring 2a via the current collecting boat 1, and the coil spring 2a is displaced by receiving a load. Therefore, by applying the strain gauge 2d to the coil spring 2a and measuring the strain, the load applied to the coil spring 2a can be obtained. The computing unit 20 obtains a vertical load f acting between the current collector boat and the boat support based on the strain amount output from the strain gauge 2d and the relationship between the strain gauge and the load obtained in advance. Then, the contact force F between the trolley wire and the pantograph
Is the vertical load f acting between the collecting boat and the boat support.
And the accelerations ω1 and ω2 of the current collector and the mass m of the current collector
From the following equation. F = f + m (W1 · ω1 + W2 · ω2) Here, W1 and W2 are weighting factors for the accelerations ω1 and ω2 measured by the accelerometers 3 and 3 ′.

As is apparent from a comparison between FIG. 1 and FIG. 5, in this embodiment, there is almost no portion of the existing pantograph additionally modified. Therefore, there is no influence on the aerodynamic characteristics and the following characteristics of the pantograph. In addition,
The signal line 4b for sending a signal to the arithmetic unit 20 is provided with a through hole in the current collecting boat 1 or the boat support 2 and is drawn out from the inside.

[0009]

As described above, the following effects can be obtained by the present invention. (1) A strain gauge is provided on the coil spring incorporated in the boat support to determine the vertical load acting between the current collector boat and the boat support, so there is almost no change in the shape and mass of the pantograph boat support. . Therefore, it is possible to obtain the original contact force data of the pantograph to be measured without affecting the aerodynamic characteristics and the following characteristics of the pantograph. (2) The structure is simple, highly reliable, and can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a pantograph contact force measuring device according to an embodiment of the present invention.

FIG. 2 is a sectional view of a coil spring.

FIG. 3 is a sectional view taken along the line AA of FIG. 2;

FIG. 4 is a mechanism diagram of a conventionally used pantograph.

FIG. 5 is a sectional view of a boat and a boat support conventionally used.

FIG. 6 is an explanatory diagram of a conventional contact force measuring device using a load cell.

FIG. 7 is an explanatory diagram of a conventional contact force measuring device using a displacement meter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Current collection boat 2 Boat support 2a Coil spring 2b Boat support shaft 2c Boat support guide 2d Strain gauge 3, 3 'accelerometer 4a Signal line 4b Signal line 5 Upper frame 6 Lower frame 7 Balance rod 8 Balancing rod 9 Underframe 10 Insulator DESCRIPTION OF SYMBOLS 11 Vehicle body 12 Trolley wire 13 Load cell 14 Load cell mount 15 Displacement gauge 16 Displacement gauge mount 20 Computing unit

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroki Sato 2-2-2 Yoyogi, Shibuya-ku, Tokyo East Japan Railway Company (72) Inventor Sei Nagasaka 2-chome, Hikarimachi 2-chome, Kokubunji-shi, Tokyo 38 Inside the Railway Technical Research Institute (72) Mitsuru Ikeda 2-8-8 Hikaricho, Kokubunji-shi, Tokyo 38 Inside the Railway Technical Research Institute (72) Koji Yamada 3--8 Fukuura, Kanazawa-ku, Yokohama-shi, Kanagawa Address Toyo Electric Manufacturing Co., Ltd. Yokohama Works F-term (reference) 2F051 AA01 AB09 BA07 5H105 AA11 BA02 BB01 CC02 CC12 DD04 EE02 EE07 EE13 EE21 GG18

Claims (1)

[Claims] 1. A method for calculating a vertical acceleration signal of a current collector boat of a vehicle pantograph and a signal of a vertical load acting between the current collector boat and the boat support to calculate a signal between the trolley wire and the current collector boat. A pantograph contact force measuring device that measures the contact force of the current collector, provided inside the current collector boat, an accelerometer for detecting the vertical acceleration of the current collector boat, and a coil spring built in the boat support A strain gauge for measuring the strain of the coil spring; a strain measured by the strain gauge; and an acceleration measured by the accelerometer. The vertical load acting between the current collector boat and the boat support is calculated from the relationship between the vertical load and the boat support, and the contact force of the pantograph is calculated from the vertical load and the acceleration measured by the accelerometer. Pantograph contact force measuring device characterized by comprising and.