Flow control device and control method for a piezoelectric injection valve
A flow control device and piezoelectric injection technology, which is applied to the device and coating of the surface coating liquid, can solve the problems affecting the impact force of the firing pin, the fluctuation of the glue output, etc., and achieve the effect of controlling the glue output
Active Publication Date: 2020-08-04
CHANGZHOU GAO KAI PRECISION MACHINERY CO LTD
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Problems solved by technology
[0003] The technical problem to be solved by the present invention is: in order to overcome the small difference in output displacement under the same voltage caused by the piezoelectric ceramic stack in the piezoelectric injection valve in the prior art changing with the piezoelectric temperature, which affects the impact force of the firing pin , the change of the impact force of the firing pin causes fluctuations in the amount of glue produced, and a flow control device and control method for piezoelectric injection valves are provided
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[0046]Specific implementation method: the rated voltage Vp of the piezoelectric ceramic 1 is 130V, the rated stroke Dp of the piezoelectric ceramic 1 under the rated voltage is 50 μm, and the distance Sp from the geometric center point of the contact surface of the piezoelectric ceramic 1 and the lever 2 to the fulcrum 3 is 2 mm; The distance Ss from the geometric center point of the contact surface between the detection rod 8 and the lever 2 to the fulcrum 3 is 18 mm; it is substituted into the calculation formula of the empirical coefficient k, namely:
[0047] k=(Vp*Sp) / (Ss*Dp)=(130V×2mm) / (18mm×50μm)≈0.2889V / μm
[0048] When the production process requires a single-point glue output of 0.05mg, the voltage value Vc applied to the piezoelectric ceramic 1 is 70V, and the displacement detection rod 8 corresponding to the stroke of the striker 4 required to detect the glue output that meets the process requirements The relative displacement D0 is 240μm;
[0049] The piezoelectr...
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The invention relates to a flow control device of a piezoelectric injection valve and a control method thereof, wherein the flow control device of the piezoelectric injection valve comprises: a piezoelectric ceramic, and after the piezoelectric ceramic is energized, it deforms along the axial direction and drives a lever connected to one end of the piezoelectric ceramic to rotate around a fulcrum Movement; one end of the lever is connected to the fulcrum, and the other end is connected to the striker; the striker is sleeved with a first elastic element, one end of the first elastic element is against the lever, and the other end is against the housing; the outside of the first elastic element is also set A second elastic element is provided, one end of the second elastic element is offset against the lever, and the other end is connected with the flow channel assembly; a displacement detection rod is also connected to the lever, and one end of the displacement detection rod is slidably connected with the displacement sensor. By using the flow control method of a piezoelectric injection valve according to the present invention, the closed-loop control of piezoelectric ceramics can be effectively realized, and the stroke of each output of the striker can be accurately controlled to keep it consistent, thereby effectively controlling the glue output.
Description
technical field [0001] The invention relates to the technical field of piezoelectric injection valves, in particular to a flow control device and a control method for piezoelectric injection valves. Background technique [0002] With the rapid development of the electronics industry, the quality requirements for electronic packaging are getting higher and higher. For the high-demand electronic packaging technology, non-contact injection valves are more and more widely used in the field of electronic packaging due to their high efficiency and high precision. . As the core driving component of the non-contact piezoelectric injection valve, the piezoelectric stack with high response speed and high precision is also widely used in non-contact injection valves. As the requirements for electronic packaging are getting higher and higher, the control of glue weight is becoming more and more strict, but because the piezoelectric ceramic stack in the piezoelectric injection valve cur...
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IPC IPC(8): B05C5/02
CPCB05C5/0225
Inventor 崔建松刘建芳顾守东吕庆庆
Owner CHANGZHOU GAO KAI PRECISION MACHINERY CO LTD