Closed type static pressure turntable and bidirectional piston clamping mechanism thereof

Abstract

The invention relates to a close type static pressure rotary table and a double way piston clamping mechanism thereof, which are assembled on a large or medium size numerical control machine tool. The close type static pressure rotary table is characterized in that the lower column of the rotary table body of a work bench and the inner bore of a bull gear adopt clearance fit in the form of coaxial basic hole, and laid on a slide seat together, and a guide pair with inverse pressure formed on the upper surface of a static pressure oil chamber is machined on the bottom surface of the bull gear with higher flatness and fineness and the slide seat; a pressure plate and a double way piston clamp are arranged on the periphery at intervals, butt-jointed static pressure oil chambers of the pressure plate and the static pressure block embedded on the pressure plate are communicated with the oil outlet pipe of a quantitative multi-head pump, so as to respectively provide static oil for the upper surface and the lower surface of the guide pair; the upper part and the lower part of the double way piston clamp are arranged above the bull gear and under the bull gear, a drive unit formed by a gear reducer is installed on the side surface of the slide seat, and the two gears of the drive unit are meshed with the bull gear, so as to transmit the torque and drive the work bench to revolve. The invention not only has the advantages of traditional open type static pressure rotary tables, but also has the advantages of strong offset load bearing ability and steady float height due to the close type structure, the load bearing ability of the large or medium size numerical control machine tool provided with the work bench is increased, the machining accuracy is improved, the installation work hour and the maintenance work hour are reduced, and the cost is decreased.

Description

technical field [0001] The invention relates to mechanical manufacturing equipment, that is, a closed static pressure turntable and a clamping mechanism in a machine tool. technical background [0002] The development direction of modern CNC machine tools is the "three highs" trend of high speed, high torque, and high load capacity, and the requirements for guide rails, which are an important part of machine tools, are also constantly improving: high precision, high rigidity and large load-carrying capacity, friction coefficient Low. Therefore, as the most commonly used traditional steel-coated plastic guide rail pairs and rolling linear guide rails, they cannot fully meet the above requirements, and have gradually withdrawn from the preferred range of modern machine tool designers. Although the new heavy-duty linear guide rail can meet the requirements of the linear motion of the machine tool, it is difficult to meet the requirements of the circular guide rail of the rotar...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a closed static pressure turntable and its two-way piston clamping mechanism, which solves the problem that the large and medium-sized CNC machine tool has a closed static pressure structure rotary table that cannot control the floating amount when the static pressure floats

[0006] In order to solve the problems of the traditional rotary table, such as poor ability to bear eccentric loads, high friction, difficult to rotate at high speed, and uncontrolled floating height, the closed static pressure rotary table of the present invention applies the principle of quantitative static pressure, and is used as a pair of rotary ring guide rails A pressure plate is installed on the upper surface of a part of the large ring gear, which adds constraints to the rotary table and reduces its degree of freedom, leaving only one degree of freedom in the direction of rotation; and a static pressure chamber is embedded on the pressure plate copper plate, forming a closed static pressure structure

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