Dust-free sandblasting machine is a high-efficiency shot blasting/sand blasting and rust removal equipment with integrated design. The machine has a delicate and flexible wood body, and can be connected to the workpiece to remove rust. Such as steel bridge decks, ship decks, floors, etc. Its working principle shows that the high-speed rotating throwing head is used to throw the steel grit or steel shot to the surface of the workpiece at a high speed, and the oxide layer and rusted products on the surface are destroyed by the impact effect of the sand shot. The shot blasting machine walks on the workpiece like a car, and a continuous and uniform abrasive circulation path on the sandblasting surface can be obtained: the hopper stores the abrasive → enters the abrasive control valve → enters the shot separation wheel → throws the head high and cast → the workpiece surface is Cleaning → abrasive rebounds to the sand return chamber → abrasive is sucked back to the hopper, thus completing the automatic recycling of the abrasive and recycling the dust movement path: the dust generated on the surface of the workpiece (broken oxide layer and rust products and the crushing of part of the abrasive The product) is sucked back to the hopper with the material → the dust is separated through the dust and sand separator → enters the dust collector through the dust suction pipe → the clean air after filtering the dust is discharged into the atmosphere. The working characteristics of the dust-free automatic shot blasting machine :

(1) The whole system is composed of several simple structures such as shot blasting and sand returning part, walking part, dust collector and controller:

(2) C control, the parameters are adjustable, and the ideal cleaning effect can be achieved by adjusting the walking speed and the amount of sand feeding;

(3) The flexible operation can move forward, evacuate and turn, and operate continuously, and any part of the large plane can obtain uniform rust removal quality;

(4) The friction material and dust are automatically recovered and processed, without sand leakage and environmental pollution

(5) The construction efficiency is high, and the effective width of shot blasting can reach 5003 copper surface sandblasting and rust removal quality requirements and construction technology

Quality requirements for sandblasting and rust removal of steel bridge decks. Two dust-free white-motion shot blasting machines were used to carry out sand blasting and rust removal treatment before anti-corrosion coating on the Li bridge deck of Taomen Bridge in Zhoushan Mainland Connecting Island Project. Ye Bridge is a two-tower cable-stayed bridge connecting Fuchi Island and Shiluo Island. It is located in the environment of marine atmospheric corrosion, and the anti-corrosion requirements for copper structures are particularly high. The bridge deck adopts epoxy zinc-rich anti-corrosion coating. The construction period of the anti-corrosion layer of the bridge deck is only 15 years. 3.2 The construction process of the surface treatment of the steel bridge deck before painting 3.2.1 The surface pretreatment 1) Check the appearance of the bridge deck after welding and forming, and ensure that the bridge deck has no welds , splashes and burrs, etc., if they do not match, they should be removed by mechanical grinding (2) The grease stained on the surface of the steel before sandblasting must be removed and cleaned (recommended cleaning with cleaning agent 3) Shot blasting/sandblasting process After neutralization construction, it is necessary to prevent the surface of the steel from contaminating the oil from scratch. 3, 2., 2 Sand blasting / shot rust removal 1) Environmental conditions: the ambient temperature should be 3°C higher than the atmospheric dew point: the relative humidity should be less than or equal to 85%, It is forbidden to carry out the sand blasting/pellet rust removal operation of the bridge deck in the weather such as rain and dew.

(2) Abrasive: The abrasive material used in the sand blasting machine should be cast steel shot and cast steel sand that meet the requirements of national standards. The particle size should be 0.7-1.0m. (3) The ratio of steel grit/shot, considering the requirements of construction efficiency and rust removal quality, the abrasive used in shot blasting should be mixed with steel shot and steel grit on site. The abrasive type and ratio are recommended as follows: The mixing ratio of S330 type steel shot and G25 type steel grit is 7:34) The walking speed of the shot blasting machine should be adjusted properly, and it is best to go 12 times to reach the roughness and cleanliness requirements (5) The surface after shot blasting should be carefully protected , to prevent secondary pollution. Before painting, the inspected rust-removed surface should be soot-blown. 6 After sandblasting and rust removal, epoxy zinc-rich paint should be applied as soon as possible, generally not exceeding h. The bridge deck can be divided into pieces for surface treatment, and after passing the white inspection and supervision inspection, it is decided to carry out oil painting.​