Wheel set press-fitting machine and wheel set press-fitting method

Abstract

The invention discloses a wheel set press-fitting machine and a wheel set press-fitting method. The wheel set press-fitting machine comprises a rack, two press-fitting mechanisms and a controller, wherein the press-fitting mechanisms are electrically connected with the controller, and the two press-fitting mechanisms are distributed in a spaced mode in the left-right direction and horizontally and fixedly installed at the left end and the right end of the rack correspondingly. The press-fitting mechanisms are used for clamping the two ends of an axle wherein a wheel set is to be installed in a press fitting mode, and conducting press-fitting on wheels pre-assembled at the two ends of the axle in place. Each press-fitting mechanism further comprises a displacement sensor, and the displacement sensors are used for detecting the extending lengths of the press-fitting mechanisms when the press-fitting mechanisms clamp the axle. The controller controls the extension lengths of the two press-fitting mechanisms according to the detection results of the two displacement sensors when the two press-fitting mechanisms clamp the axle, so that the axle can be centered in the rack, and the controller further controls the press-fitting mechanisms to carry out press-fitting on the wheels. The wheel set press-fitting machine achieves convenient installation, and a small installation error and is low in rework rate.

Description

technical field [0001] The invention belongs to the field of rail transportation equipment, and in particular relates to a wheel pair pressing machine and a wheel pair pressing method. Background technique [0002] The measurement and control systems of the existing wheel set press equipment are all closed-loop control, and the biggest defect of closed-loop control is that there are many error points, and the collection of multiple error points will cause the overall press-fit error to be enlarged (that is, one step is wrong and one step is wrong) , the current measurement theory calculation formula for the measurement control of the wheel set pressing machine is (L-L 0 ) / 2=L 1 = L 2 , where L is the axis length, L 0 is the inner distance of the wheel set, L 1 , L 2 is the distance from the end face of the axle to the inner face of the wheel on the same side, where L 0 is 1353mm, wherein, the structure of the wheel set includes the axle and two wheels, specifically as ...

AI Technical Summary

Problems solved by technology

[0003] The closed-loop measurement control is adopted, and the press-fitting steps are as follows: the first step: measure the shaft length L of the wheel shaft, the second step: pre-press and straighten the wheel, the measuring head and the rim fit the computer to calculate the target value L of the piston rod of the advanced oil cylinder 1 ,The third step: start the wheel press machine to press one side of the wheel, after the one side wheel is pressed, then press the other side of the wheel, repeat the second step and press the other side of the wheel Set the target value of the advanced oil cylinder piston rod on the other side to L 2 , finally need to satisfy L-L 1 -L 2 = L 0 , and L 1 =L 2 It is considered that the pressing is completed, and in the existing wheel set pressing machine, L, L 1 and L 2 During the measurement, the measurement error and the dimensional error of the two wheels are accumulated in the distance between the inner sides of the two wheels, so that the distance between the inner sides of the two wheels is usually not equal to L 0 , so that the press-fitted wheel set is unqualified (the error exceeds the standard), and the reworked wheel needs to be placed for 48 hours to ensure the installation accuracy before it can be re-pressed (and it is very easy to cause the wheel and axle to be damaged when the wheel is withdrawn. , usually the wheels and axles can be scrapped if they are pressed more than three times)

[0004] The main reasons for the large error in the closed-loop measurement of the existing wheel set pressing machine are as follows: (1) The error in the measurement of the axle length of the wheel axle (in practice, the axle length of the same axle for re-clamping measurement is different every time), the main reason is Including: ①The clamping force of the oil cylinder on the shaft is different each time, ②The frame of the wheel set press machine will be deformed under force when the wheel shaft is clamped, ③The piston of the oil cylinder is drooping, that is, the piston of the oil cylinder is not parallel to the guide rod, etc. Poor accuracy; (2) The target value L of cylinder piston rod advance 1 and L 2 The measurement error, including the error of the measuring ruler and the related mechanical error, and the closed-loop measurement control will make the above-mentioned various errors form a collection, and the overall amplification, so that each vehicle manufacturer, each motor vehicle maintenance section and locomotive maintenance section The quality of the wheel set pressed by the reaction wheel set press machine is unstable

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