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Knowledge of sandblasting gun selection, replacement and maintenance


Sand blasting gun
One: Types of blasting machine blasting guns According to the type of blasting machine, there are general pressure siphon negative pressure spray guns and pressure high pressure spray guns.
The siphon sand blasting machine negative pressure spray guns commonly used now are as follows
Distinguish from ribs : there are two types of coarse ribs (tooth pitch 2.0mm) and fine ribs (tooth pitch 1.5mm) .These are only related to the matching of the nozzle jacket and the spray gun ribs, and have nothing to do with the nozzle and sandblaster models. It has nothing to do with the blasting effect;
Distinguish from materials : there are metal (aluminum alloy, iron, brass) spray gun and polyurethane spray gun;
Distinguish from the shape of the gun body : There are many types such as A-type, B-type, C-type, K-type pneumatic Carle spray guns, engraving spray guns with canister spray guns, and so on.If you do not consider how the spray gun is fixed on the gun frame, various types of spray guns are universal .
Distinguish from the docking method of the spray gun and the sand tube : there are direct insertion type (the sand tube is directly inserted into the spray gun and locked with a screw) and ribbed spray gun using a sand core (the sand core is inserted into the sand tube and locked with a hose clamp);
The diameter of the interface between the sand core and the air core is distinguished: the air core has a distinction of 10mm (c-type gun) and 13mm (A-type B-type gun, etc.), and the sand core is generally 13mm;
According to the blasting process of the blasting machine : there are dry blasting guns and water blasting guns.
The replacement of spray guns and nozzles has a lot to do with the type of blasting machine.
The siphon type ordinary pressure blasting machine should use a siphon negative pressure spray gun, such as the A / B / C / K type spray guns produced by our company.The sand output of these models is different, which has an impact on the speed of blasting. .
Pressure sand blasting machines should use pressure feed spray guns (small pressure spray guns / high speed spray guns / venturi spray guns). Of course, liquid sand blasting machines also have special spray guns, commonly known as water spray guns, and simple polyurethane sand blast guns.
The structure of the universal pressure spray gun is composed of the gun body, sand core (sand nozzle), air core (gas nozzle), nozzle, and nozzle sleeve.There is also a rubber sleeve on the surface of the gas core. Many customers do not understand what this rubber hose does. In fact, it is very simple.After the sand material enters the spray gun from the sand tube, the high-speed flow will hit the gas core and damage the core.The role of this hose is to protect the gas core, which belongs to the consumables of the spray gun.
The structure of the pressure-feed spray gun is composed of a spray gun jacket, a nozzle, and a spray gun connection port (sand gun joint).
1 ) A-type spray gun: also known as outer rib spray gun, divided into rib type and in-line type.The advantage of in-line type is that the sand pipe is directly connected to the spray gun to increase the amount of sand.
A-type spray gun is commonly known as a large spray gun with ears.The height from the core insert of the gun body to the rib mouth at the bottom of the gun body is 90mm, and the thickness of the gun body is 36mm.
The outer diameter of the core is 18mm, the length is 116mm, the outer diameter of the rubber part of the core sleeve is thinner, the inner diameter is 4mm, and the inner diameter 6-10mm nozzle can be used.
There are two types of materials: A1 type A2 type aluminum alloy sandblasting gun and A4 type A5 type polyurethane sandblasting gun.
2) B-type spray gun: Inner rib spray gun is divided into rib type and direct insertion type. The advantage of direct insertion is that the sand pipe is directly connected to the spray gun to increase the sand output. The height of the mouth is 90mm, and the thickness of the gun body is about 40mm.
The outer diameter of the core is 18mm and the length is 102mm.The sand material circulation space inside the gun body is large and the sand output is large, which is suitable for the automatic sand blasting machine.
The difference between the B-type spray gun and the A-type spray gun in the appearance of the gun body is that the sand core interface of the B type is 10 mm longer than the air core interface. This is convenient for users to hold the spray gun with their thumbs during sandblasting operation, which is conducive to grasping the spray gun. The type A gun core insert does not protrude from the gun body. The same thing is that the guns for automatic sand blasting machines are equipped with gun holder retaining rings (commonly called ears).
3) C-type sandblasting gun: The surface is polished, like stainless steel, light and easy to use, commonly known as small sandblasting gun, and has C1 C2 C3 models.
Because of its small size, it is the first choice for the manual blasting machine. It can be used as an automatic blasting machine after the built-in fixed gun frame is installed. Most Taiwan-funded blasting machinery equipment factories use C-type guns as automatic blasting Sand blasting machine.
The rib length of the nozzle sleeve from the core inlet to the bottom of the gun body is 7CM, and the thickness of the gun body is about 4CM.
C-type sand blasting gun: The air core is thinner, and the sand material circulation space inside the gun body is large, which is suitable for the spraying of large-grain sand materials.
The C-type blasting gun is similar to the A-type blasting gun in appearance, except that the length is different and the overall size is much smaller.
Some manufacturers also call the C-type sandblasting gun with a gun holder retaining ring (ear on the gun body) a K-type sandblasting gun.
The B -type gun has the largest sand production , and the B -type is the largest .
4) K type spray gun:
According to the true definition in the classification, the K-type spray gun is a spray gun model commonly used by Taiwanese manufacturers in the earlier period.Its characteristics are compact.The blasting nozzle with an outer diameter of 15MM can be used to blast small areas such as pipes or corners. The diameter is small, and the nozzle cover is not used at the same time.The nozzle is directly locked to the spray gun with a screw.It can be inserted into a pipe with a diameter greater than 15mm, and the groove is sandblasted.
5) Carving sandblasting gun:
The engraving sandblasting gun is also called F-type sandblasting gun.It is suitable for the sandblasting of glass, stone, marble, tablet and other objects. Nozzle, currently the material is generally ceramic nozzle, not very durable.
6) Carlo-type pneumatic sandblasting gun:
Pneumatic spray gun, Taiwan's habitual type becomes the card type. This type of sand blasting gun is shaped like a pistol. The air source switch is on the gun and can be switched at will. The sand blasting is convenient. It does not require a sand blasting machine. Machine, the most ideal gun type for sand blasting when the sand pipe is directly inserted into the sand pile.
Because the sand inlet of the gun body is designed 90 degrees perpendicular to the gun body, its sand blasting strength is weaker than the 45-degree sand blasting gun commonly used with sand blasting machines, and it also uses ceramic or iron steps for sand blasting. Nozzle, the life is not high, the cylindrical boron carbide nozzle can be used after modification.
It is suitable for sand blasting purposes such as engraving sand blasting, which saves air source and has higher efficiency.
7) Polyurethane sandblasting gun
There are mainly C type A4 A5 type, suitable for ordinary wet sand blasting machine (water sand machine).
Polyurethane material is the most widely used polymer today, which is made by addition polymerization of polyisocyanates and polyols. Sandblasting gun made of polyurethane material: light weight, soft, antistatic heat insulation, high temperature, It is the best sand blasting gun for anti-collision and anti-static for sand blasting products.
8) 45-degree bevel sandblasting gun developed by Meijun sandblasting equipment:
The 45-degree oblique angle boron carbide nozzle developed by Meijun sandblasting equipment is suitable for sandblasting or cutting on the edge of a flat object or a specific area. The nozzle is closely attached to the surface of the object, and the size of the blast is controlled by the nozzle inner diameter and the distance between the nozzle and the object. Easy to use, welcome to consult!
Nozzle size: 8 (10) * 20 * 100mm boron carbide nozzle
9) Other imported sandblasting guns: gyro-type sandblasting guns, large sandblasting guns, etc.
    High-pressure sandblasting gun
High-pressure blast guns include straight-hole blast guns and Venturi blast guns:
Straight hole type spray gun : Small pressure type sand blasting gun using ordinary straight hole nozzle (such as 35MM long, 45MM long, 60MM long) and extended straight hole sandblasting gun (155MM long, 165mm long Ding Ding sandblasting gun)
Venturi spray gun, including single-inlet sandblaster and dual-inlet sandblaster
Common materials are tungsten carbide and boron carbide
Venturi nozzle, single inlet nozzle: (Venturi nozzle, English Venturi Nozzle)
The structure of the venturi nozzle is divided into three parts, the contraction section, the straight section and the diffusion section, which is difficult to make. Venturi nozzles have better aerodynamic performance than straight-hole nozzles. The vortex phenomenon is significantly improved or no longer exists, and the pressure loss is greatly reduced. Under the same pressure conditions, the abrasive outlet speed can be more than doubled. The working efficiency is higher than that of straight-hole nozzles. Increase 15% -40%, reduce abrasive consumption by 20%. Venturi nozzles are generally long, and the venturi nozzles are designed to expand gradually so that the abrasive has a high initial velocity and sprays uniformly on the surface of the workpiece. This Venturi nozzle with an inlet of 1-1 and 2 inches is widely used for sandblasting of difficult-to-machine surfaces.
General conventional model comparison table:
Flare entrance diameter is 32MM and 25MM
Nozzle sleeve thread specifications: standard inch thread 1-1, 4, 11-1, 2 NPSM coarse thread 2, 4-1, 2 UNC
Inner diameter (ID) Outer diameter (OD) Length
1/4 inch (6.4mm) 1-5, 8 inches (41.5mm) 125mm
5/16 inch (7.9mm) 1-5, 8 inch (41.5mm) 135mm
3/8 inch (9.5mm) 1-5, 8 inch (41.5mm) 165mm
7/17 inch (11.1mm) 1-5, 8 inch (41.5mm) 195mm
1/2 inch (12.7mm) 1 -5, 8 inches (41.5mm) 220mm
Double inlet nozzle (double venturi nozzle):
We give you the most complete range of sandblasting products, allowing you to enjoy the ease and joy of one-stop service, save your precious time, and get a relaxed and happy working state!
It consists of two front and rear nozzles. Due to the effect of high-speed airflow, a large negative pressure is generated. The surrounding air is sucked into the nozzle, so that the amount of air ejected is greater than the amount of air sucked in. The blasting area of the double-blast air blasting gun is 35% larger than the standard single-blast blasting area, and the outlet speed of the blasting medium is reduced. This type of nozzle is usually used for large-area medium-strength surface treatment.
General conventional model comparison table:
Flare entrance diameter is 32MM and 25MM
Nozzle sleeve thread specifications: standard inch thread 1-1, 4, 11-1, 2 NPSM coarse thread 2, 4-1, 2 UNC
Inner diameter (ID) Outer diameter (OD) Length
1/4 inch (6.4mm) 1-5 / 8 inch (41.5mm) 130mm
5/16 inch (7.9mm) 1-5 / 8 inch (41.5mm) 140mm
3/8 inch (9.5mm) 1-5 / 8 inch (41.5mm) 170mm
7/17 inch (11.1mm) 1-5 / 8 inch (41.5mm) 200mm
1/2 inch (12.7mm) 1-5 / 8 inch (41.5mm) 225mm
Ding Ding style high pressure sand blasting gun:
We give you the most complete range of sandblasting products, allowing you to enjoy the ease and joy of one-stop service, save your precious time, and get a relaxed and happy working state!
The shell is made of plastic, which has a good feel and an obvious anti-collision effect. The nozzle is generally made of tungsten steel, and the inner hole is designed with an elongated straight hole, which makes the sand blasting more concentrated and the blasting distance is longer.
Second, the purchase, replacement and maintenance of sand blasting guns.
The blast gun can be replaced by itself.The components inside the blast gun can also be replaced and purchased .
What kind of spray gun each blasting machine uses, there is no hard use rule, it seems to be a personal use habit. Of course, depending on the purpose of the blasting and the use of the sand material , you can choose a little, mainly based on the standard of achieving the blasting purpose, such as For engraving, of course, it is better to use a sandblasting gun with a handle. If the nozzle is durable, of course, a sandblasting gun that can use a boron carbide nozzle is good (some spray guns use special-shaped nozzles, and boron carbide nozzles are not used).
If it is an automatic sand blasting machine, you need to consider the total cost of the air gun when replacing the spray gun to ensure the stable air supply of the air compressor. Generally speaking, the inner diameter of the core of the standard sand blasting machine is 4MM, which is a universal type. Don't worry about too many gun models.
The following factors are considered when replacing the spray gun :
1) The size of the spray gun: The size and model of the spray gun are related to the internal space and fixation of the sand blasting machine, especially the automatic sand blasting machine. Generally, the manual sand blasting machine uses a small and exquisite spray gun with a large output, such as a C-type spray gun. Automatic machine Then you need to consider the model of the fixed gun frame to see if you choose an ear spray gun (A / B / K type) or an inlay spray gun (C type gun).

2) When buying or replacing a spray gun, you need to consider the size of the remaining blast gun spare parts in stock: for example
Problems with the ribs of the nozzle sleeve: there are thick (tooth pitch 2.0mm) and fine (tooth pitch 15mm);
The size of the outer diameter of the air core of the spray gun: A type B type core has 18mm and 17mm diameter, C type has 15mm and 16mm or other;
The size of the inner diameter of the air core of the spray gun: the standard inner diameter of the air core is 4mm, and there are special purpose inner diameters of 3 or 2 or 5mm. The corresponding inner hole of the nozzle should be different;
If you don't pay attention to the above situation, the returned spray gun and the spare parts in stock are not up to the head, or the nozzle sleeve cannot be screwed on, or the sand is not produced, or the air core cannot be inserted into the spray gun, which results in headaches.

3) Nozzle sleeve and nozzle matching problems: The nozzle is universal, and the nozzle sleeve is related to the outer diameter and length of the nozzle. Generally speaking, the outer diameter of the nozzle is 0.3mm deviation according to the national standard. The returned nozzle cannot be inserted into the nozzle sleeve, and it should be handled as follows, it will definitely work:
A: Boil the rubber sleeve with boiling water. After the water is boiled for about 15 minutes, the rubber sleeve can be inserted when it is softened .
B: If it is not boiled. Go to the hardware processing shop, and ask the master to use a machine tool to cut the inside diameter of the rubber sleeve. It is very fast and cheap. It costs more than ten yuan to cut 50 pieces.
Additional language :
1) The spray gun of the universal pressure siphon sand blasting machine generally uses a straight hole nozzle, because the straight hole nozzle is relatively cheap and can meet the requirements of most blasting effects.Even if the intensity of the blasting is not as large as that of the Venturi nozzle, it can also be used. Adjusted by using long nozzles and increased pressure to meet demand.
2) Venturi nozzles are usually used for pressure sandblasting machines, especially Venturi nozzles are used for sandblasting machines imported from abroad, because the purpose of using pressure sandblasting machines is to spray difficult objects in order to achieve good If you want to change the nozzle type, it is necessary, but why buy a pressure type sand blasting machine at that time, I feel like buying a bull knife to kill the chicken.
Of course, for small area blasting or special purpose blasting such as engraving, a pressure-type blasting machine must be used to achieve the pressure effect.At this time, a pressure-type small blasting gun will be used.This type of blasting gun uses a straight hole type. The nozzle with a small inner diameter is the same as the nozzle of a siphon type sand blasting machine and is economical.
3) Some nozzles have an outer diameter of 15MM, and the nozzles with a longer nozzle length of 60MM and 80MM are mostly used for mobile sand blasting machines or for convenient spraying in small areas. Generally, the common nozzle outer diameter is 20 (21) MM, and The inner diameter is the selection factor to consider the effect of blasting.
Company Name: Magin Dongguan Humen Meijun Wear-resistant Sandblasting Equipment Store Tel: 0769 82261696 13215392671
Address: 69 Longyan 5th Road, Longyan Industrial Zone, Humen, Dongguan http://sereio.com zhongjunhui@21cn.com QQ: 491440166
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