Foam caulking gun

Abstract

The invention relates to a foam caulking gun. A liquid inlet channel is formed in a gun body of the foam caulking gun, and a control device is arranged in the liquid inlet channel and comprises a closure member, a reset spring, a fixed seat and a control head. The reset spring is arranged at the lower end of the closure member, and one end of the reset spring is elastically connected with the closure member. The fixed seat is arranged under the liquid inlet channel, and the other end of the reset spring is fixed to the fixed seat. The closure member is sealed with the liquid inlet channel, and a closed opening is formed in the liquid inlet channel. A closed belt is formed on the closure member, and the closure member extends above the closed opening. The control head is arranged at the upper end part of the closure member. When the control head is pushed downwards, the control head pushes the closure member to move downwards so as to open the liquid inlet channel, and the control head controls the closed belt to keep a stable distance with the closed opening. When downward thrust is not applied to the control head, the closure member seals the liquid inlet channel under elastic force of the rest spring. The foam caulking gun can generate front foaming.

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 sealant can generally use polyurethane as the main raw material, or other chemicals as the main raw material. English PU FOAM 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 suitable for sealing and waterpro...

AI Technical Summary

Problems solved by technology

[0007] 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 balls. , the ball is automatically reset and sealed by the return spring. When the foam caulking gun is installed on the storage tank with foam caulking agent, the foam caulking agent will push the ball away by the pressure generated by itself, so that the foam in the storage tank will be filled. The caulking agent enters the inner channel of the foam caulking gun, because the pressure generated by the foam caulking agent pushes the ball to open the channel and enters the channel in the gun body. In this way, 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 causes the ratio of gas and polyurethane in the storage tank to change when encountering this situation, which affects the foaming effect and causes the foaming of the foam sealant. The foaming is uneven, and the amount of foaming is greatly reduced; if half of the foam sealant in the storage tank is used, the pressure in the storage tank will be reduced even more, so that the injection of the foam sealant will be less smooth and more likely to occur. The intermittent phenomenon causes the foaming of the foam sealant to be uneven, resulting in poor quality of the foam and greatly reducing the amount of foaming; in addition, this structure is prone to post-foaming, which is foam filling. After spraying out, the caulking agent gradually becomes thicker, which is several times thicker than when it was punched out. This makes it difficult for workers to grasp the strength of pulling the trigger (switch), and it is easy to waste foam caulking agent, at least 1 / 3 wasted. The cost is high; to make matters worse, the post-expansion foam caulk tends to deform or crush the doors and windows after curing

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