Piezoelectric on-off valve type jetting dispensing head

Abstract

The invention discloses a piezoelectric on-off valve type jetting dispensing head, and relates to a dispensing device mainly for the quick assembly of electronic chips. The jetting dispensing head is provided with a base, two piezoelectric ceramics, pull rods, a triangular block, a heating block, stop blocks, a nozzle, a firing pin, a flexure hinge and a liquid supply device, wherein the base is provided with the flexure hinge, two piezoelectric ceramics are pre-tensioned on two arms of the flexure hinge respectively through stop blocks, the stop blocks are arranged in the front end of the piezoelectric ceramics respectively, and are fixed on the base by the pull rods and embedded in stop blocks guide groove of the inner frame edge of the base; the nozzle is fixed on the front end under the base; cover plates are arranged on two sides of the base respectively, the rear ends of two cover plates are fixed on two arms of the flexure hinge by bolts, and the triangular block are fixed on the front end of two cover plates; the firing pin is arranged on the front end of the triangular block; the heating block is fixed on the lower part of the base; the liquid supply device is provided with a colloidal runner, an inlet conversion adapter and an inlet hose; and the liquid supply device is arranged on the lower part of the base, a heat-insulating groove is arranged between the base and the liquid supply device, and the colloidal runner is externally connected with the liquid supply device through the inlet conversion adapter and the inlet hose.

Description

technical field [0001] The invention relates to a dispensing device mainly used for rapid packaging of electronic chips, in particular to a piezoelectric switch valve type jet dispensing head. Background technique [0002] Dispensing machine is a commonly used equipment in the processing and packaging of electronic products. The dispensing methods of existing fluid dispensing machines are generally divided into contact type and non-contact type. The principle of the contact glue dispenser is to push the fluid through needles of different apertures to contact the substrate and components for dispensing by a certain air pressure, or to transfer the glue to the required part for bonding by dipping the needle tip. The method of contact dispensing has the problems of easy interference between the needle and the substrate, the viscosity of the colloid is greatly affected by temperature, and the problem of low efficiency caused by stringing phenomenon and vertical movement. The n...

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Problems solved by technology

Although this kind of amplification mechanism has a simple structure, there are several problems that are difficult to overcome: first, it fixes two piezoelectric ceramics together, so only two piezoelectric ceramics with exactly the same size can be used in actual use; Second, because the front end of the triangular block needs to fix the striker, and the striker needs to be vertically aligned with the nozzle to work effectively, so the total length of the mechanism can only be changed within a small range, so that this type of mechanism can only use some kind of fixed Third, in order to achieve good spraying, adjusting the centering of the striker to the nozzle is very important but also very time-consuming. The mechanism must replace the front cover with the triangular The block is removed together, so the striker must be re-centered after reinstallation

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