DE8707725U1 - Pneumatic gun - Google Patents

Description

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;'. The compressed air pistol described below is used for string

shaped pressing and for spraying hot melt adhesives from

S aluminum cartridges. In contrast to the previously common compressed air

pistols of this type, this pistol has a new system for the

Heating and control of the necessary for the atomization of the adhesive

- &igr; maneuverable compressed air.

Description

A cylinder (7) is mounted on the handles (24), on the underside of which a heating housing is attached, in which a

Heating coil (36) with spiral sleeve, which is heated by the heating cartridge (37). The cylinder (7) is surrounded by a heat-insulating protective jacket (6). At the front end of the cylinder there is a screw-on spray housing (31) with the nozzle parts (1, 2 and 29). The heating coil (36) is connected to the spray housing (31) by a ^pipe (23). A throttle valve (32) is built into the pipe (23).

! The rear cylinder opening is closed by a screw cap (14), on the back of which the heat:insulating handwheel (15) is attached. At the upper end of the cylinder (7) there is a

Quick exhaust valve (10) which is connected to the reducing valve (20) via a hose line (12). A double 3/2-way valve (26) is fitted in the handle of the handle shells (24), the two valve pins of different lengths (38 and 39) of which are actuated by the lever (27).

: Part 28 is the line for the compressed air connection and part 25 is an electric cable that leads to the electronic heat controller.

Function

&iacgr; The compressed air gun is connected to the supply lines (25 and 28). The desired temperature is then set on the separate electronic heat regulator (adjustable between 60 and 200° C). After filling the cylinder (7) with the adhesive, the closure cap (14) is screwed on tightly.

With this compressed air gun, the material pressure and the atomizer pressure can be adjusted independently of each other. The material pressure is adjusted using the adjustment screw (18). Turning it clockwise increases the material pressure and thus increases the material throughput at the nozzle (29). To adjust the material pressure, the screw (34) of the throttle valve (32) is tightened. This shuts off the atomizer air. When the lever (27) is operated, the adhesive now comes out of the nozzle (29) in the form of a strand. If the adhesive is to be sprayed, the screw (34) must be turned to the left (anticlockwise).

The spray pattern depends on the following factors:

1.) the temperature of the adhesive 2.) the pressure and temperature of the atomizing air

3.) from material pressure

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When the lever (27) is operated, the valve pin (38) is first pushed back, which causes the pressure air to flow through. Hot compressed air (pressure air) now flows through the air head (1). If the lever (27) is pushed back completely, the valve pin (39) opens the valve for the pressure line (12) of the cylinder. At this moment, the material is pushed out of the nozzle (29) and the air is atomized.

When the lever (27) is released, the valve for the material pressure closes first - the material feed is stopped and then the valve for the atomization. This double valve arrangement causes air to flow out of the air head (1) after the material flow out of the nozzle (29) has already stopped (machine air). Dripping of the material during spraying

Claims (3)

Protection claims 1.) Compressed air gun characterized in that there is a double 3/2-way valve (26) in the handle of the handle shells (24), whose valve pins (38 and 39) of different lengths are actuated by the hand lever (27) in such a way that the closing of the compressed air line (23) - i.e. the atomizing air - in relation to the compressed air line (22) (air for the material pressure) takes place with a delay. 2.) Compressed air gun according to claim 1, characterized in that a reducing valve (2G) is installed in the pressure line (22). 3.) Compressed air gun according to claim one and two, characterized in that a manually operated throttle valve (32) is attached to the valve housing (31), through which the atomizing air of the compressed air line (2.3) can be shut off.