Special built-in glue injection gun for low-pressure glue injection

Abstract

The invention provides a special built-in glue injection gun for low-pressure glue injection. The gun comprises a gun body and a glue injection gun nozzle which is formed on the end part of the gun body, wherein at least one glue injection channel is arranged in the side wall of the gun body; the glue injection gun nozzle has a glue storage cavity and a glue outlet hole; the glue injection channel is communicated with the glue storage cavity, so that glue enters into the glue storage cavity through the glue injection channel and flows out from the glue outlet hole; the gun body further comprises an air cylinder which is internally provided with a piston and a gun needle; one end of the gun needle is connected with a piston while the other end of the gun needle extends into the glue injection gun nozzle; the piston can move between a first position and a second position so as to drive the gun needle to seal or open the glue outlet hole of the glue injection gun nozzle. The gun provided by the invention has the advantages that the gun can be used for controlling the amount of the glue to avoid cold melt and is compact in structure, minimized and high in reliability.

Description

technical field [0001] The invention relates to the field of low-pressure glue injection, in particular to a built-in special glue gun for low-pressure glue injection. Background technique [0002] The existing low-pressure glue injection machine adopts the tension of the open melt to seal the glue injection nozzle or adopts the spring nozzle to seal the glue injection mouth, all of which have cylinder sinking and potential safety hazards. For low-pressure injection materials with good fluidity and low viscosity, there is basically no sealing effect. As long as the glue is delivered to the injection nozzle, the glue will automatically flow out through the small hole of the injection gun after melting. If the closed structure of spring plus valve needle is adopted, the opening or closing of the valve needle is compressed by the tension of the spring. When the glue is injected, the valve needle compresses the spring to open the nozzle for glue injection. When the glue injectio...

AI Technical Summary

Problems solved by technology

However, the force to open the spring of the injection nozzle is exactly the effective thrust of our injection, so this structure will cause a loss of injection pressure, which will eventually affect the quality of the injection product

In addition, the air-controlled glue injection gun can be used to realize the glue injection, but it is necessary to add a gun stock and install the glue injection gun on the gun stock. Also because the glue injection gun is external, it is easy to lose heat and cause the "cold glue phenomenon" during glue injection

Images