Hot melt adhesive spray valve

Abstract

The invention relates to a hot melt adhesive spray valve. The hot melt adhesive spray valve can comprise a hot melt adhesive heating device, a valve body, a valve element and a striker. Heat transferof the hot melt adhesive heating device acts on a hot melt adhesive tank and a flow channel, wherein the flow channel communicates with an outlet of the hot melt adhesive tank. The valve body comprises a first cavity and a second cavity, wherein the first cavity and the second cavity are spaced from each other in a sealed manner. The first cavity is provided with an air inlet. On and off switchingof an air inlet channel communicating with the air inlet is achieved through a high-frequency air inlet and outlet switch. The air inlet end of the high-frequency air inlet and outlet switch is connected with high-pressure air. The second cavity is provided with an adhesive inlet and a spray orifice, wherein the adhesive inlet communicates with the flow channel, and the spray orifice is formed inthe lower end. The valve element is jointed into the first cavity in a sealed manner and connected with an elastic component. The upper end of the striker is fixed to the valve element and extends tothe second cavity. The lower end of the striker can plug the spray orifice. The valve element can perform reciprocation motion in the first cavity under the effect of the high-pressure air and the elastic component, and furthermore, the striker is driven to perform reciprocating motion so that hot melt adhesive entering the second cavity through the flow channel can be sprayed out of the spray orifice.

Description

technical field [0001] The invention relates to a hot melt glue injection valve. Background technique [0002] Hot melt adhesive is a kind of plastic adhesive. Its physical state changes with temperature within a certain temperature range, but its chemical properties remain unchanged. It is non-toxic and tasteless, and is an environmentally friendly chemical product. Because the product itself is solid, easy to pack, transport, store, solvent-free, non-polluting, and non-toxic; and it has the advantages of simple production process, high added value, strong bonding strength, and fast speed. [0003] In the automatic dispensing industry, the injection valve is a key component. The injection quality of the injection valve greatly affects the effect of automatic dispensing and even determines whether automatic dispensing can be realized. Most of the existing injection valves used for dispensing need to dispense glue, the needle is lifted to open the nozzle of the injection val...

AI Technical Summary

Problems solved by technology

This kind of injection valve has the following disadvantages: the injection speed is slow, the injection is not uniform enough, the minimum injection volume is too large, it is impossible to achieve finer and more precise dispensing, and the injection volume cannot be adjusted precisely

Existing injection valves cannot meet this requirement

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