Optimizing design method of three-roller guiding device connecting rod mechanism

Abstract

The invention provides an optimizing design method of a three-roller guiding device connecting rod mechanism. The method is characterized in that the maximum value and the minimum value of opening degree of three guiding rollers, the diameter of the guiding rollers and the travel of a hydraulic cylinder I are used as known conditions, the hinged point position of a rocking bar and the rocking arm length of the guiding rollers are determined according to the principle that the trajectory of the guiding rollers tends to be symmetrical around the rolling center, a hydraulic cylinder II that a piston rod completely penetrates through is regarded as a connecting rod, and the crank hinged point position of the mechanism and the sizes of all the rod pieces are regarded as design variables, so that the travel of the hydraulic cylinder I and the opening degree of the guiding rollers tend to a linear relationship, the operation of tending the inscribed circle center position of the guiding rollers to the rolling center is regarded as an optimizing target, the satisfied condition of the normal working and the good transmission characteristic of the connection rod mechanism are used as a constraint condition, an optimizing design math model is built, a virtual prototype model is built through ADAMS(Automatic Dynamic Analysis of Mechanical Systems), and a main object method is used for completing optimizing and solving, the working performance simulation testing is conducted on the optimized mechanism, and the mechanism parameters are finally determined.

Description

technical field [0001] The invention relates to the technical field of production of hot-rolled seamless steel pipes, in particular to an optimal design method of a three-roller guiding device connecting rod mechanism used at the exit of a cross-rolling piercing machine or at the entrance of a cross-rolling pipe rolling mill. Background technique [0002] There are several three-roll guide devices along the rolling direction at the exit of the cross-rolling piercer. The three guide rollers of each guide device clamp the ejector rod during the piercing process, so that the top of the front end of the ejector rod is located in the middle of the roll gap of the piercer. ensure that its center line coincides with the rolling center line, and prevent the ejector rod from being destabilized under pressure during the piercing process; when the capillary is extended, each guide device loosens the ejector rod in sequence with the movement of the front end of the capillary, limiting th...

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Problems solved by technology

[0017] ① There is no in-depth discussion on the influence of the position of the hinge points D and G of the rocker and the length of the swing arm of the guide roller on the working performance of the mechanism, and no specific calculation method is given, but it is considered to be related to the structural design

[0018] ②Using the analytical method to analyze the mechanism, the design, programming, and calculation processes are cumbersome, the workload is heavy, and the working performance of the mechanism cannot be evaluated intuitively and conveniently

[0019] ③In the mechanism design process, only the centering accuracy is considered but the relationship between the stroke of the hydraulic cylinder I and the opening degree of the guide roller is not considered

Although such processing avoids cumbersome analytical derivation and reduces the amount of calculation of the control system, it does not consider the resulting nonlinear error; when the nonlinear error is too large to affect the adjustment of the opening, the operator needs to adjust the Proper correction of the situation will bring a lot of inconvenience to the calibration of the control system, the operation and maintenance of the equipment

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