The sandblasting room produced by Dongguan Meijun sandblasting equipment is also called sandblasting room and sandblasting room. It is mainly suitable for cleaning and derusting the surface of some large workpieces, increasing the adhesion between the workpiece and the coating, etc. Before painting large workpieces Generally, sandblasting is used for surface treatment, in order to obtain a rough and flat surface to improve the adhesion and decoration of the coating. Sandblasting systems are available in both closed and open systems. For large workpieces, an open blasting system is generally used to blast the product in the blasting room, and the blasted abrasive is automatically recovered by the recovery device. According to the different abrasive recovery methods, the blasting system can be divided into two types: mechanical type and pneumatic type. The abrasive recovery of mechanical blasting system is completed by the horizontal conveying device and the lifting device, and the abrasive recovery of pneumatic blasting system is conveyed by air flow.
 
 1. Pneumatic sand blasting room
 1 Working principle
It is composed of dust removal device, abrasive sorting device and electric
 
 
control device. In order to simplify the equipment, the two parts of abrasive recovery and ventilation and dust removal can be combined. The fan sucks the abrasive, dust and airflow to the abrasive centralized filter through the honeycomb floor. The dust-containing gas is filtered by the filter, the dust adheres to the outer wall of the filter, and the clean gas passes through the filter and part of it is discharged to the outside of the workshop, and part of it is circulated into the sandblasting room. Abrasives and heavy dust continue through the abrasive chute to the sorter. The sorter is an inner and outer cone structure, and there is an adjustable channel between the inner and outer cones. By adjusting the core, the cross section of the airflow channel can be changed to adjust the separation ratio. The separation process is: When the abrasive and dust pass through the channel, due to the action of gravity, the dust and gas come out upward through the gap between the cones, while the abrasive and coarse particles fall to the vibrating screen below the cone. The vibrating screen further separates the abrasive and coarse particles, and the separated pure abrasive enters the designated hopper through the sieve hole to the sandblasting tank for recycling. The dust and gas passing through the separator are then filtered by a filter, the clean gas is discharged out of the workshop, and the dust falls into the waste hopper.
 2 Sandblasting system structure
2.1 Basic structure of sandblasting system
According to the process requirements, the sandblasting system selects the manual sandblasting method, and the products of different materials are equipped with special sandblasting tanks and sandblasting. Tank pressure and flow can be adjusted at any time according to requirements. Each sandblasting tank is equipped with 1-4 spray guns, and the sandblasting system can work with 4 spray guns at the same time.
2.2 House structure
The sandblasting house is welded by steel plates, and its skeleton is a gantry type structure. The gantry is connected by cross-connecting rods. The gantry is installed on the installation block with anchor bolts. on the ground. The door frame is covered with pressed thin steel plates on both sides, with a thickness of 0.5~0.8 mm, and the surface is painted. In order to improve the service life of the house, a wear-resistant rubber sheet with a thickness of 6mm is pasted inside the house. The technical parameters of the rubber sheet are: hardness 38IRHD, tensile strength 26.6 MPa, elongation 81%, tear strength 83%, Xinyuantong environmental protection equipment, Xinyuantong environmental protection equipment ||| Sandblasting room
, abrasion index (wet) 108, temperature range 4-70 ℃.
 

The lighting adopts a dust-proof lighting system, and the indoor illumination is required to be no less than 650 lx at 1.5 meters above the ground. All doors leading to the blasting room are equipped with electrical interlocks to ensure that the blasting system stops working when any door is opened. Door peripheral warning light, the light is on to indicate that sandblasting is in progress.

 
2.3 Honeycomb floor
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The floor in the sandblasting room adopts a special honeycomb floor, and the size of each honeycomb floor is 500mm×500mm. Every two rows of honeycomb floors along the length of the sandblasting room form a honeycomb floor module. After the abrasive falls into the honeycomb floor, the fan sucks it through the material hole into the collection pipe, and then sucks it away from the collection pipe.
 
2.4 Abrasive centralized filtration system
Abrasive centralized and dust removal share a set of system, including centralized fan, centralized filter and so on. In order to ensure the visibility in the sandblasting room, the ventilation frequency
is not less than 50 times per hour, and the ventilation air volume is 65 130 m3/h. A 45 kW fan is used, of which the fan air volume is 21 010 m/h.
 
2.5 Abrasive recovery and sorting system
 

Abrasive recovery and separation The selection system includes abrasive troughs, sorters, filters and connecting pipes. The abrasive goes from the abrasive tank to the sorter through the connecting pipe, where it is sorted and recovered. In order to improve the service life of the sorter, wear-resistant rubber is pasted on the outside of the inner cone and the surface of the outer cone. Due to the different materials of the products, the abrasives used for sandblasting are also different. In order to avoid the impact of iron abrasives on the aluminum alloy car body, a magnetic separation device is added under the separator to separate the iron and non-ferrous abrasives to ensure the quality of the aluminum alloy car body sandblasting. The magnetic separation device is a magnetic drum, and a permanent magnet is arranged under the magnetic drum. When the magnetic drum rotates, the iron abrasive is adsorbed on the magnetic drum due to the magnetic force on the side of the magnet; when the magnetic drum turns to the side away from the magnet, the magnetic force disappears, and the iron abrasive falls into a corresponding container. The drum rotates continuously, which separates the ferrous and non-ferrous abrasives within the abrasive.

 
2.6 Sandblasting equipment
The whole The sandblasting system is equipped with a double-chamber continuous working sandblasting tank, and each sandblasting tank is equipped with two spray guns with a diameter of 10 mm and two abrasive valves. An operation switch is installed on the handle of the spray gun, and it can realize automatic control, which can control the spraying or jetting of the nozzle. This can be used to blow dust off the work surface after cleaning.
3Summary
The pneumatic sandblasting system has no mechanical failure and simple maintenance because it has no mechanical conveying parts. The honeycomb floor is directly installed on the ground, and the foundation requirements are simple. The air flow is sent up and down and sucked down, the dust reduction time is short, the indoor air circulation effect is good, and a system is shared with the abrasive recovery, and the equipment is simple.