Digital linear servo pump

[0027] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples, and detailed descriptions are as follows with accompanying drawings:

[0028] The digital linear servo pump of the present invention combines a servo motor, a ball screw and an oil cylinder to form a digital linear servo pump.

[0029] Such as image 3 As shown, the digital linear servo pump of the present invention includes a numerical control system 1, a comparator 2, and a servo amplifier 3 connected in sequence. The output of the servo amplifier 3 is connected to a linear oil pump 14, and the linear oil pump 14 passes through a pipeline The first oil cylinder group 10 is connected, and the piston of the first oil cylinder group 10 is connected to and drives the machine tool worktable 4, and the machine tool worktable 4 is connected to the comparator 2 through the grating 6.

[0030] The linear oil pump 14 includes a servo motor 5, a ball screw 7 and a second cylinder group 13 connected in sequence, wherein the input end of the servo motor 5 is connected to the output end of the servo amplifier 3, The second cylinder group 13 is connected to the first cylinder group 10 through pipelines, and the second cylinder group 13 is also connected to the accumulator 15 through the first one-way valve 11 and the second one-way valve 12 respectively.

[0031] Such as image 3 As shown, in actual work, the command signal issued by the numerical control system 1 enters the servo amplifier 3 through the comparator 2 and drives the servo motor 5 to rotate after amplification. The servo motor 5 drives the ball screw 7 to push the second cylinder group 13 in the corresponding direction The linear movement of the second cylinder group 13 pressurizes the oil in one cavity and enters the corresponding cavity of the first cylinder group 10. The moving parts of the first oil cylinder group 10 move in the opposite direction of the moving parts of the second oil cylinder group 13 to push the worktable 4 to move. The grating 6 detects the moving amount of the worktable 4 and converts it into an electric signal and sends it to the comparator 2. When the signal of the grating 6 enters the pulse number of the comparator 2 and the command pulse number of the numerical control system 1 is equal, that is, when the output of the comparator 2 is zero, the servo motor 5 stops moving, the ball screw 7 stops moving, and the second cylinder group The piston rod of 13 stops moving, and the second cylinder group 13 stops discharging oil, the first cylinder group 10 stops moving, and the workbench 4 stops moving. When the numerical control system 1 outputs a pulse signal in the opposite direction, the servo motor 5 and the ball screw 7 move in the opposite direction, and the second oil cylinder group 13 and the first oil cylinder group 10 move in response.

[0032] After a certain period of work, that is, after a certain number of reciprocating movements, the hydraulic oil in the second cylinder group 13 and the first cylinder group 10 will have a small amount of loss, in the second cylinder group 13 and the first cylinder group 10 Cavitation will appear in the low-pressure chamber, which will affect its normal operation. When this happens, the accumulator 15 will pass through the first check valve 11 and the second check valve 12 to the second cylinder group 13 and the first cylinder. The low pressure chamber of group 10 supplies oil.

[0033] Because the digital linear oil pump of the present invention has a volumetric efficiency of over 99.9%, it has high rigidity and positioning accuracy, and can realize <0.001mm, can be achieved with figure 2 The solution shown uses the electro-hydraulic servo valve to control the same stiffness and precision, but the reliability is much higher than that of the electro-hydraulic servo valve, and its manufacturing cost is greatly reduced. The positioning accuracy can greatly improve the processing finish.