Digital linear servo pump

Abstract

The invention relates to a digital linear servo pump comprising a numerical control system, a comparator and a servo amplifier which are connected in sequence, wherein the output of the servo amplifier is connected with a linear oil pump; the linear oil pump is connected with a first oil cylinder group through a pipeline; a piston of the first oil cylinder group is connected with a machine table and used for driving the same; and the machine table is connected with the comparator through an optical grating. The linear oil pump is sequentially connected with a servo motor, a ball screw and a second oil cylinder group, wherein the input end of the servo motor is connected with the output end of the servo amplifier, and the second oil cylinder group is connected with the first oil cylinder group through a pipeline. The second oil cylinder group is also connected with an energy accumulator respectively through a first one-way valve and a second one-way valve. By using the digital linear servo pump, higher driving rigidity and precision can be obtained, and the locating precision can be up to at most 0.001mm. The machine machining smoothness can be improved, the work reliability can be greatly improved, but the cost is greatly reduced.

Description

technical field [0001] The invention relates to a digital linear servo pump, in particular to a digital linear servo pump which combines a servo motor, a ball screw and an oil cylinder. Background technique [0002] In modern CNC machine tools, the most widely used driving method is the servo motor to drive the ball screw, and the linear rolling guide rail is used to complete the CNC coordinate drive of the CNC machine tool. The CNC coordinate drive mechanism of this CNC machine tool such as figure 1 As shown, it includes: a numerical control system 1 , a comparator 2 , a servo amplifier 3 , a servo motor 5 , a ball screw 7 and a machine tool workbench 4 connected in sequence, and the machine tool workbench 4 is connected to the comparator 2 through a grating 6 . This driving method has been widely used in CNC machine tools for decades, and currently it can achieve a positioning accuracy of 0.003-0.004mm and a repeat positioning accuracy of 0.001-0.002mm. [0003] However,...

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Problems solved by technology

[0005] figure 2 Compared with the servo motor ball screw drive mode, the electro-hydraulic servo drive mode shown has the following advantages: high driving rigidity, high positioning accuracy, and fast dynamic response; its disadvantages are: (1) The drive efficiency is low, only 38% at most , so it will generate heat; (2) The cleanliness of the oil is high; (3) The zero point drift of the electro-hydraulic servo valve is large, and the reliability of its work is far inferior to that of the servo motor ball screw, and its cost is much higher. In the 1970s, it was quickly replaced by the servo motor ball screw method

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