| In the multi-rope friction lifting system,the balance wheel is an important component in the friction lifting system,which carries various dynamic loads and impact loads during the operation of the wire rope,resulting in the friction pad gradually wearing,so the pad needs to be regularly repaired.To ensure the balance of the wire rope to maintain balance.Due to the difficulty of installation,there is no good on-line turning device for the Tianhuan liner.The crane can only be moved to the ground by the crane,which seriously affects the normal production of the coal mine.For this reason,the main contents of this paper are:The turning process and control method have been improved on the basis of the conventional trough device.First of all,the machining method of turning and milling is used to make the rope groove form once,which improves the cutting efficiency.Then,according to the new process,a two-dimensional numerical control worktable is designed.Through the high-precision ball screw and the slide rail,the transverse X-axis tool movement and the longitudinal Y-axis feed motion are realized.According to the stepping motor and For the model of the ball screw,the minimum step can be controlled at 0.004 mm.The assembly error of the ball screw and the base of the trough device was analyzed by the homogeneous change matrix.According to the results,the actual running error of the trough device was 0.007 mm in the lateral direction,0.002 mm in the longitudinal direction,and the offset angle in the infeed direction was 0.19°.In order to avoid the feed amount is too large,the gasket and the cutter head are damaged.According to the power of the cutting motor,the single maximum feed amount is calculated,and the feed amount corresponding to different rotation speeds is determined in combination with the running error.In order to install the trough device at high altitude,this paper designed a special bracket.To ensure the safety of use,the strength of the bracket was checked by theoretical calculation and combined with finite element.When the trough device is installed,it is easy to produce parallel error with the sky wheel in the X-axis direction,and offset error between the Y-axis direction and the axis of the sun gear.In this paper,the parallelism error and the axis generated when installed on the ground and at high altitude.The mathematical model of the offset error is established and the associated error curve is obtained.Accordingly,the installation method has been improved to improve the installation accuracy.Based on the measurement of the diameter of the rope groove after cutting,two measuring devices are designed based on the "bow height chord length method" and the "roller method".The theoretical measurement accuracy of the two measurement methods is analyzed by establishing a mathematical model.Finally,select the appropriate measurement method according to different installation environments.In order to verify the reliability of the trough device,industrial experiments were carried out.The experimental results show that the control precision and cutting efficiency of the CNC trough device have been greatly improved.The rope groove after turning can effectively improve the tension imbalance of the wire rope.Extend the life of the wire rope.Figure 67 Table 31 Ref 81... |
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