Foam caulking gun with safety mechanism

Abstract

The invention relates to a foam caulking gun with a safety mechanism, which comprises a gun body, a liquid inlet valve, a liquid outlet, a valve core, a switch, a resetting spring and a regulating piece, wherein the resetting spring is used for resetting the valve core. The foam caulking gun is characterized in that the safety mechanism used for preventing the regulating piece from accidentally falling back is arranged, and an anti-dropping mechanism used for preventing the safety mechanism from dropping is arranged on the regulating piece. The regulation is easy, stable, safe and reliable, the regulating piece is effectively prevented from moving freely, and the regulating piece is prevented from accidentally falling back. Telescopic movement regulation is obvious, the regulating and locking situations are easily controlled, and the regulating and locking stabilities are high. The safety mechanism is effectively prevented from dropping, and the safety mechanism can be ensured to work safely and reliably. The construction quality is increased, the waste phenomenon of a foaming agent is avoided, and the phenomena of leakage, accidental spraying, burning, explosion or solidification are effectively avoided. The foam caulking gun is convenient and accurate in regulation, good in hand feeling and low in cost, and is suitable for mass production.

Description

technical field [0001] The invention relates to the field of building decoration tools, and relates to a foam caulking gun for providing a foaming foam caulking agent. Background technique [0002] For doors, windows, walls, concrete, air-conditioning installation insulation, various pipeline installations, vents and wire outlets in buildings and houses that require caulking (caulking) or leaks, special material tapes are generally used. The foam caulking agent with high air pressure is used as the raw material. When using it, the foam caulking agent is released quantitatively and foamed through the foam caulking gun to achieve the purpose of caulking or leak repair. The injection of the foam caulking agent is generated by itself. Pressure to achieve injection, such as: foam sealant can be mixed with polyurethane and butane gas as the main raw material, with high viscosity, foam sealant is easy to leak or spray, once it contacts air, it will solidify immediately, so it is hi...

AI Technical Summary

Problems solved by technology

When a tank is installed on the liquid inlet valve of the foam caulking gun and there is still foam caulking agent left in the tank during a break or after construction, or when there is still foam in the liquid outlet cavity of the foam caulking gun after use. When the foam sealant is left behind, the adjustment member must be rotated and the valve core must be fixed so that the switch cannot pull the valve core, so that the valve core can press the liquid nozzle tightly to prevent leakage or accidental injection or burning caused by unintentional or child pulling the switch Or the danger of explosion, because the spring is fixed by the adjustment piece, the force of the spring is all on the adjustment piece, and the adjustment piece has the effects of the above aspects, so it will cause many defects, such as: if the spring is made more Small elastic force, although the rotation is easy, but the force of the spring on the valve core is not strong enough, it is easy to cause the seal between the valve core and the liquid outlet valve to be incomplete, resulting in leakage, combustion or explosion, and it is also easy to make the foam caulking gun inside The foaming agent will solidify at any time and block the channel, causing the foam caulking gun to be scrapped

If the spring is made with a larger elastic force, the valve core and the liquid outlet valve can be tightly sealed, so that the adjustment member rotates heavily because the adjustment member directly acts on the spring, and it is very difficult to use or difficult to adjust. If the thread fit between the adjusting part and the gun body is slightly tight, it is even more difficult to adjust and lock the valve core. After construction, the use of the adjusting part is often abandoned, or unwilling to use the adjusting part, resulting in the user not using the adjusting part. The adjustment part is locked with the spool, so it is easy for children to pull the switch unintentionally, causing the risk of leakage or accidental spraying or burning or explosion, and it is also easy for the foaming agent in the foam caulking gun to solidify at any time and block the channel, causing foam caulking gun scrap

[0003] There is a foaming gun at present, the patent number is 200620105928.7 (notification number CN2933607Y), including gun body, gun barrel, compression spring, needle bar, wrench, the adjusting device is located on the gun body of foaming gun, including a protruding gun The adjustment screw on the outside of the body is characterized in that the compression spring is sleeved on the needle bar and is located in the barrel, one end acts on the needle bar, and the other end acts on the gun body, and one end of the needle bar extends out of the gun body And connected on the wrench, the gun body is provided with a sliding cavity along the axial direction of the needle bar, and a slidable adjusting screw is arranged in the sliding cavity, one end of the adjusting screw is screwed on the adjusting screw, and the other end is opposite to the adjusting screw. The sliding cavity is fixed circumferentially, the adjusting screw can be rotated, and is fixed axially relative to the gun body. The adjusting screw of this structure is rotated in situ, and the adjusting screw is driven by the rotating adjusting screw to drive the adjusting screw threadedly connected with the adjusting screw. The adjusting screw can be moved in the sliding cavity. This structure solves the above-mentioned shortcoming of heavy adjustment, but because the adjustment is too light, there are problems such as unstable adjustment and unsafe use.

For example: ①The cooperation between the adjustment screw and the adjustment screw of this structure is in a movable and free state. The adjustment screw is prone to displacement due to easy movement and light rotation, resulting in inaccurate adjustment or adjustment failure. There are low adjustment stability and Low Security Defects

②The amount of liquid output from the foam caulking gun is controlled by the adjusting screw. During the construction process, the handle pulls the valve core and repeatedly hits the adjusting screw that plays a controlling role. Because the cooperation between the adjusting screw and the adjusting screw is in the active and In the free state, it is easy to cause the adjustment screw to loosen and cause displacement, which may easily cause the failure of the liquid output limit or the excessive liquid output to waste the foaming agent (foam caulking agent)

③ After the adjusting screw locks the spool, if the handle is repeatedly pulled by hand, the force of the handle will repeatedly act on the adjusting screw, which will easily cause the adjusting screw to loosen and cause displacement to unlock. This structure has low locking stability and is prone to leakage or Accidental spraying or burning or explosion or curing phenomena

④ If the adjustment screw and the adjustment screw are made to closely cooperate, the problem of easy rotation can be solved, but it is easy to cause the adjustment to be too tight and make the rotation heavy, making it difficult for the user to adjust the liquid output of the foaming agent, and it is also easy As a result, abandoning the use of the adjusting screw after construction, or unwilling to use the adjusting screw, failing to lock the adjusting screw to the spool in time, it is easy to accidentally or a child pulls the switch and there is a danger of leakage or injection or burning or explosion, and it is also easy to use the adjusting screw. The foaming agent in the foam caulking gun solidifies at any time and blocks the channel, causing the foam caulking gun to be scrapped

⑤ It is also possible to improve the matching accuracy of the adjusting screw and the adjusting screw, so that the adjusting screw does not feel heavy or light when it is turned. However, the processing accuracy must be very high, which will inevitably result in a high rate of defective products and double the processing cost In addition, if dust or rust spots are accumulated at the precise fit between the adjusting screw and the adjusting screw and slag is generated, the adjustment will be heavy and even unable to rotate, resulting in foam blockage. seam gun scrap

⑥Because the cooperation between the adjusting screw and the adjusting screw is completely in an active and free state, it is easy to be bumped or rubbed to cause the adjusting screw to rotate, and it is easy to release the adjusting screw to lock the valve core, so that children or unintentionally pull the switch to cause leakage or spraying or fire or explosion hazard

⑦ The adjusting screw is fixed relative to the axial direction of the gun body. The adjusting screw of this structure can only rotate in situ and cannot be telescopically moved. Therefore, it is difficult to determine whether the adjusting screw is in the state of locking the spool or unlocking the spool. Distinguished, easy to cause negligent adjustment without locking, prone to leakage or jetting or the risk of burning or explosion

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