Driving mechanism for nut rotary type long lead screw

Abstract

The invention discloses a driving mechanism, particularly a driving mechanism for a nut rotary type long lead screw, which comprises a long lead screw and a nut with a thread. The two ends of the long lead screw is fixedly supported on a support; the nut with the thread which is matched with the long lead screw is connected with a rotary driving mechanism; the outer side of the nut with the thread is provided with a fixed sleeve which is connected with a connecting plate; a bearing is arranged between the fixed sleeve and the nut with the thread; and the rotary driving mechanism is arranged on the support which is connected with the fixed sleeve or the connecting plate. During use, the long lead screw does not rotate, the nut with the thread is driven to rotate by a power plant to enable the nut with the thread to move relative to the long lead screw, so that the nut with the thread drives other components to move, the problem of large deflection caused by the rotation of a long ball screw is solved, and the adverse factors such as the restriction on the critical rotational speed of the ball screw are avoided. Thus, when the length of the lead screw is longer and the movement speed is higher, oscillation phenomenon cannot occur and the lead screw can move steadily without influencing other components, which improves the running accuracy of the equipment.

Description

technical field [0001] The invention relates to a driving mechanism, in particular to a nut rotating long lead screw driving mechanism. Background technique [0002] The use of screw and the screw nut matched with the screw as the driving mechanism is widely used in mechanical equipment, such as the ball screw structure in metal cutting machine tools, driven by the servo motor, through the synchronous toothed pulley and the toothed belt Drive the ball screw to rotate, the ball screw is supported on the bed through bearings, the rotation of the ball screw drives the nut matching the ball screw to move, and the bracket connected to the nut can drive the carriage to move longitudinally . The screw driving mechanism of this structure is suitable for the situation of short longitudinal stroke. If the longitudinal stroke is long, strong vibration will occur when the screw reaches a certain number of revolutions. [0003] Taking the CNC lathe CKA61100M / 5000 as an example, the lon...

AI Technical Summary

Problems solved by technology

That is to say, the theoretical longitudinal fast moving speed is 6.6m. Practice has proved that when the longitudinal fast moving speed exceeds 4m, the screw will vibrate strongly. Centrifugal force, so that the lead screw bends to produce a large deflection, so it produces a strong shock, which not only affects the longitudinal speed but also affects the positioning accuracy of the carriage

Therefore, the screw drive mechanism with the above structure is not suitable for situations where the moving distance is long

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