Device for detecting arc of non-dovetail-shaped steel back interface of high-speed rail brake pad

Abstract

The invention discloses a device for detecting a non-dovetail-shaped steel back interface arc of a high-speed railway brake pad, and the device comprises a rack which is provided with a detection platform, and the detection platform is provided with a rotating arm frame and a detection part. The detection component comprises a detection support, a dial indicator, a transmission support, a detection probe used for being in arc sliding connection with a non-dovetail type steel back interface and a positioning shaft used for positioning a high-iron brake pad, one end of the rotating arm frame is pivoted with the detection platform, the other end of the rotating arm frame is provided with the detection support, and the dial indicator is installed on the detection support. The measuring head of the dial gauge is connected with the upper end of the transmission support, and the lower end of the transmission support is connected with the detection probe. The device is simple in structure and convenient to operate, can quickly, effectively and accurately detect the size of the non-dovetail type steel back interface arc, and is suitable for machining process control and large-batch detection of non-dovetail type steel backs.

Description

technical field [0001] The invention relates to the technical field of rail transit, in particular to a device for detecting the arc of a non-dovetail steel back interface of a high-speed rail brake piece. Background technique [0002] Non-dovetail brake pads are often used for braking and deceleration of 300-350km / h Harmony EMUs in my country. Please refer to the attachment for the interface size and outline requirements of the brake pads. figure 1 (Excerpted from the standard "TJ / CL 307-2019 Interim Technical Conditions for EMU Brakes"). According to the standard, dimensions R310±0.5, 122±0.5, 9.3±0.2, 19.6±0.2 are important interface dimensions, which are directly related to the assembly and use of brake pads and brake calipers. The standard requires strict control of the above interface dimensions to ensure that they meet the requirements. Among them, the dimensions of 122±0.5, 9.3±0.2, and 19.6±0.2 can be controlled and detected by making the pass and stop gauges that ...

AI Technical Summary

Problems solved by technology

The standard requires strict control of the above-mentioned interface dimensions to ensure that the requirements are met. Among them, the dimensions 122±0.5, 9.3±0.2, and 19.6±0.2 can be controlled and detected by making go-no-go gauges that meet the requirements; however, the arc size of the interface is R310±0.5, and its height 9.3±0.2mm, the detection space is narrow, and the arc length is short, it is difficult to measure and the accuracy is low

The testing scheme in "TBT 3558-2020 Special Measuring Tool for Rolling Stock Bogie Brake Shoe and Brake Pad Measuring Tool" is as follows figure 2 For the general gauge shown, the arc size of the general gauge interface is R310±0.08. Whether the general gauge can pass through the non-dovetail steel back interface smoothly can determine whether the interface size meets the requirements. From the size of the general gauge, it can be known that the general gauge does not Can not accurately detect the interface arc size R310±0.5mm

The current better measurement method is to use three-coordinate detection equipment for measurement, but there are problems such as high equipment cost, large capital investment, harsh operating conditions, and low measurement efficiency, which is not suitable for the control of steel back machining process and mass inspection.

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