Foam joint filling gun

Abstract

The invention relates to a foam joint filling gun which comprises a gun body, a liquid feeding valve, a liquid discharging valve and a switching device, wherein the liquid feeding valve comprises a liquid feeding channel, a closing piece and a resetting spring; the liquid feeding channel is sealed by the closing piece, and a closed opening is formed in the liquid feeding channel; a closing band is formed on the closing piece; a pushing piece for pushing the closing piece to downwards move is arranged in the liquid feeding channel and positioned above the closed opening; under downward thrust, the pushing piece pushes the closing piece to downwards move to open the liquid feeding channel, so that the pushing piece controls a stable distance to be kept between the closing band and the closed opening; under a condition of no downward thrust on the closing piece, the closing piece seals the liquid feeding channel due to the elasticity of the resetting spring. The foam joint filling gun can realize pre-foaming, achieve a relatively good joint filling and repairing effect and protect objects and is uniform in foaming and large in foaming amount, and resources are saved.

Description

technical field [0001] The invention relates to the technical field of building decoration tools, in particular to a foam caulking gun. Background technique [0002] Foam caulking agent can generally use polyurethane as the main raw material, and other chemicals can also be used as the main raw material. "PU FOAM" for short), is the product of the combination of aerosol technology and polyurethane foam technology. It is a special polyurethane product filled with polyurethane prepolymer, blowing agent, catalyst and other components in a pressure-resistant aerosol can. When the material is sprayed from the aerosol can, the foamy polyurethane material will expand rapidly and react with the air or the moisture in the contacted substrate to form a foam. The cured foam has multiple effects such as caulking, bonding, sealing, heat insulation, and sound absorption. It is an environmentally friendly, energy-saving, and easy-to-use building material. Sound insulation, especially su...

AI Technical Summary

Problems solved by technology

[0006] When the material is sprayed from the foam caulking gun, the foamy material will expand rapidly and solidify with the air or the moisture in the contacted matrix to form foam, which is used for caulking or leak repair, etc. In order to prevent the foam caulking gun from The inner channel of the foam caulking gun is clogged. After use, use the cleaning agent in the storage tank to clean the remaining foam caulking agent in the inner channel of the foam caulking gun. The liquid inlet of the foam caulking gun is usually sealed with a closure. , the closure is automatically reset and sealed by the return spring. When the storage tank with foam caulking agent is installed with a foam caulking gun, the foam caulking agent pushes the closure by the pressure generated by itself, so that the foam in the storage tank is filled. The caulking agent enters the inner channel of the foam caulking gun, because the pressure generated by the foam caulking agent pushes the closure to open the channel and enters the channel in the gun body, so that the opening of the channel is generally very small or when it occurs The closed phenomenon makes the injection of the foam sealant more or less, which affects the foaming effect, causes the foaming of the foam sealant to be uneven, and greatly reduces the amount of foaming; if the foam sealant in the storage tank When it is half used, the pressure in the storage tank is reduced even more, so that the injection of the foam sealant is less smooth, and it is more prone to intermittent phenomena, resulting in uneven foaming of the foam sealant, resulting in poor quality of the foam, At the same time, the amount of foaming is greatly reduced; in addition, this structure is prone to post-foaming. Post-foaming means that the foam sealant gradually becomes thicker after being sprayed out, which is several times thicker than when it was punched out. It is difficult for workers to grasp the strength of pulling the trigger (switch) in their hands, and it is easy to waste the foam sealant, at least 1 / 3 of which is very expensive; what is worse is that the post-expansion foam sealant is easy to deform the doors and windows after curing. crushed doors and windows

[0007] For the existing foam caulking gun, when the storage tank of the foam caulking agent is combined with the foam caulking gun, it needs to be used at intervals after use or when it has not been used up or the storage tank has not been unloaded after use. The liquid channel is in contact with the closure, that is to say, they are prone to glue accumulation due to automatic closure and cause sticking, that is to say, they are prone to blockage

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