KZ-2A electric spray gun

                KZ-2A electric spray gun

                                                                                              Instructions   

1.Overview

 Our factory is a professional engaged in a variety of sandblasting rust removal, electrical/ gas spraying equipment, as well as various types of dust collector characteristics of enterprises. With excellent quality and after-sales service, we have been praised by users and made due contributions to the development of thermal spraying.

Application of spray gun and applicable spraying material:

Ancillary equipment to be configured

(1) Air compressors: air compressors with an exhaust capacity of 1 m3/min can be used for a gun, and air compressors greater than 3 m3/min should be selected if sandblasting is taken into account.

(2) Air Filter: FS1-3. type of air filter made by our factory

(3) Oxygen and acetylene cylinders and their pressure regulating valves.

(4) Gas pack (gas tank):>0.5 m3 volume.

2.Structure of the spray gun

1.Mechanical transmission

 The continuous feeding of wire material is to use the motor as the power to drive the planetary gear and worm gear to slow down, so that a pair of wire feeding wheels rotate in the opposite direction, and rely on the spring pressure to clamp the sprayed wire, then the wire is continuously fed to the spray gun head. In order to make the speed of wire feeding stable and speed adjustment, the governor is specially equipped to realize stepless speed regulation of wire feeding to adapt to the spraying of various materials.

2.Mixing head (gas mixing part)

 It is composed of mixing head , nozzle, air cap, mixing pipe, stem shell and stem. It is the main mechanism to control the mixing of oxygen, combustible gas and the opening and closing of air. The bottom of the mixing head is a stem shell with a stem, oxygen, gas and air head, each with a rubber sealing film on it, and various grooves on the stem surface. It is used to control and distribute the three gases into the mixing head in order to ensure normal ignition and switch to achieve spraying purpose.

When the stem wrench rotates clockwise to 90 degrees, the combustible gas head sinks slightly under the action of the spring, a small amount of combustible gas enters the nozzle, and the rest of the gas head is in the closed position, and the ignition condition is available at this time. When the point is on fire, then slowly turn the stem wrench from 90 degrees in the same direction to 180 degrees, when all the heads sink, and the air cap forms the required fire filling, and the air is ejected from the nozzle to the air cap. Dissolve the incoming metal wire into a fine mist particle (spark) in the flame and spray it onto the workpiece surface, stacking it into a coating.

3、Handle: play the role of hand and machine clip.

三、KZ-2A gas spray gun performance and technical data

4.Application of KZ-2A type metal wire spray gun

In order to obtain excellent coating, it is necessary to follow figure 2: 

Use steps:

 （1）Start the air compressor and let it idle for a few minutes, then remove the oil and water waste from the filter and the bottom of the air bag, close the drain valve, and keep the air pressure at 0.5~0.6 MPa..1

(2) Connect the oxygen, acetylene and air under the handle respectively (the intermediate joint is connected with air, the slotted joint is connected with acetylene, and the right joint is connected with oxygen).

（3）Pull the stem wrench to the full open position, adjust the working pressure                 of the three gases, adjust the pressure according to the table, and then pull the stem wrench back to the full closed position.

（4）Turn on the switch on the panel and the switch on the spray gun. Turn the wire roller and turn off the switch on the spray gun.

（5）Turn the support screw wrench clockwise to separate the two wire feed rollers, then insert the spray wire from the rear duct, through the nozzle, and finally extend about 6-8 mm in front of the air cap, reverse the support screw wrench to make the wire feed rollers clamping the wire, the clamping force is adjusted by a spring shell on the left and right of the gearbox. The more the spring shell is turned inward, the greater the clamping force, and reversal. The clamping force depends on the hardness of the sprayed material. Generally, it is better to clamp until the wire can be fed smoothly and evenly.

                                                                                                     Figure 3

(6) Ignition (see above Figure 3): Rotate the stem wrench 90 degrees clockwise (middle position in Figure 3) when the ball falls into the stem slot (can be heard or felt by hand)its ignition position. Before the spray gun, ignition with a fire gun or other safety fire, turn the stem handle slowly to 180 degrees full open immediately after ignition, when the flame is formed, turn on the wire feed switch of the spray gun motor immediately before the spray gun, and there is a molten metal spark before the spray gun (if there is a burst and tempering phenomenon, close the stem wrench immediately in the reverse direction. Wait a few seconds before firing in sequence, fully open).

(7) Regulation of spark density

 In order to achieve the ideal coating and the best spraying efficiency and make full use of flame heat energy, it is necessary to adjust the wire feeding speed and gas pressure, and generally only to adjust the oxygen pressure and wire feeding speed. Take spray steel as an example: when the steel wire is melted in front of the air cap, its wire feeding speed should be adjusted to the melting point of the steel wire, and it should extend from the front end of the air cap about 2 to 3 mm, or flush with the end of the air cap. At this time, if the fire bouquet is not dense or the sparks are scattered, adjust the oxygen pressure to achieve a dense and dense fire bouquet. When spraying zinc and aluminum, the melting point can extend beyond the end surface of the air cap to be larger than that of sprayed steel, but the extension length depends on the thickness of the coating particles.

Four - Maintenance

 Because the KZ-2A spray gun adopts butadiene rubber O sealing ring and flat film, it eliminates the defects of air leakage and frequent grinding. As long as the air cap seat is loosened and the stem wrench is rotated 180 degrees when not in use ,(i.e. jet position) to keep the rubber parts elastic for a long time.

The long bearing and worm rod on the spray gun should always be kept smooth, adding some thin grease containing molybdenum disulfide.

 In addition, it is always to keep the air cap clean, nozzle holes open and spray gun clean, except that there is no need for other maintenance.

Cause of failure of KZ-2A spray gun

六、packing list