Closed circuit road surface portable movable shot blasting machine
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The Closed circuit road surface movable shot blasting machine is a new small, portable and mobile shot blasting machine, mainly used to increase the roughness and friction coefficient of concrete floors, asphalt pavements, and rust removal on the surface of large steel plates.
The working principle of road surface shot blasting machine:
The closed circuit road surface shot blasting machine, motor drives the impeller body to rotate. Relying on the centrifugal force, the shot blasting turbine throws the shot abrasive material (steel shot or sand) onto the surface of the concrete or steel plate at a high speed (about 70 m/s) and a certain angle (about 45 degrees). On the surface, let the shot material hit the surface of the concrete or steel plate, and then cleaned by the airflow of the matching vacuum cleaner inside the movable shot blasting machine to separate the shot material and the cleaned impurities and dust, and the recycled shot material is repeatedly thrown to clean the road surface Purpose of marking.
During the operation of the portable shot blasting machine, by controlling and selecting the particle size and shape of the shot abrasive, and adjusting and setting the walking speed of the shot blasting machine, the shot flow rate is controlled to obtain different shot strengths and different surface treatment effects.
Shot blasting machines can be divided into hand-push type, vehicle-mounted type and white line type according to the walking mode. With walking motor, it can walk independently, theoretically climb 30%, can forward and reverse functions, three-phase asynchronous, 380v/480v, 50Hz/60Hz.
What are the models of road surface portable shot blasting machine?
The pavement closed circuit shot blasting machine is a new small, portable and mobile shot blasting machine, mainly used to increase the roughness and friction coefficient of concrete floors, asphalt pavements, and rust removal on the surface of large steel plates. At present, the models of pavement shot blasting machines on the market are divided into SA-850, SA-550 and SA270, etc. The models are based on the projecting width of the equipment.
How much flat ground can the road shot blasting machine clean up in a day? According to the proficiency of the operators and the site conditions, the road shot blasting machine model SA-550 can clean about 2000 to 3000 square meters a day; the road shot blasting machine model SA-270 is currently the smallest type of equipment among the domestic movable road shot blasting machines. Only one person can complete the shot blasting construction task, and it can clean about 1,000 to 2,000 square meters a day.
Technical parameters of road shot blasters:
| Items | SA-270 | SA-550D | SA-850D |
|---|---|---|---|
|
Shot turbines quantity |
1 set |
2 sets |
2 sets |
|
Workable width |
270mm |
550mm |
800mm |
|
Walking speed |
0.5~23m/min |
0.5-33 m/min |
0.5-33 m/min |
|
Concrete surface |
180m2/h |
400m2/h |
600m2/h |
|
Steel plate surface |
40-50 m2/h |
80-100 m2/h |
120-160 m2/h |
|
Shot abrasive diameter |
Ø1.2-1.5mm |
Ø 1.5-1.8mm |
Ø 1.5-1.8mm |
|
Overall size |
1000*300*1100mm |
2050*725*1460mm |
1950*1020*1550mm |
Application range of road shot blasting machine:
1. Surface treatment of shot blasting machine for concrete bridge deck.
The Closed circuit shot blasting process can clean up and remove the floating slurry and impurities on the concrete surface at one time. The most important thing is that the concrete surface is roughened at the same time to make the surface uniform and rough, which greatly improves the bonding strength of the waterproof layer and the concrete base layer. And in this process, the shot blasting process can fully expose the concrete cracks and other diseases, so that remedial measures can be taken in advance.
Can the road shot blasting machine be constructed on rainy days? No, because steel shots cannot be recovered on rainy days, and the steel shots may become lumps or damage the equipment.
The concrete bridge deck is treated by shot blasting technology:
- Clean, tidy and rough surface without additional cleaning;
- Will not damage the base layer or cause loosening of aggregates in the original base layer;
- Good and uniform surface roughness;
- Completely and evenly remove surface scum and sand layer;
- Meet the requirement of a certain explicit rate;
- Greatly improve the bonding strength of the waterproof layer;
- Suitable for the paving of various waterproof coatings, coiled materials, and modified emulsified asphalt;
- At the same time, the shot blasting technology has high work efficiency when processing the concrete bridge deck without causing environmental pollution to the surrounding environment, which is in line with the current national policy of energy saving, consumption reduction and environmental protection.
- Through comparison, it can be considered that a medium, uniform, flat and clean surface of the bridge deck is the best interface to improve the bonding strength and shear resistance of the bonding material to the bridge deck. Therefore, the shot blasting technology is relative to my country’s treatment of concrete bridge decks. Traditional technology is highly advanced and economical.
- The pavement portable shot blasting machine can solve the defects of the concrete surface treatment. It can clean up the floating slurry and impurities on the concrete surface at one time, and can roughen the surface of the concrete to make the surface uniform and rough, which greatly improves the waterproofing The adhesive strength of the layer and the concrete base layer can better combine the waterproof layer and the bridge deck. At the same time, it can fully show the cracks of the concrete and play a preventive role.
2. Maintenance of the road tunnel
The pavement in the tunnel is generally made of cement concrete due to considerations of waterproofing and material fire and oil resistance. But at the same time, this also puts forward higher requirements for the anti-skid performance of the long tunnel pavement. The shot blasting process is a simple construction, small equipment investment, significant effect and environmental protection.
In recent years, there have been more and more projects using closed circuit media shot blasting to treat bridge decks and tunnels. In the waterproof paving of concrete bridge decks, shot blasting is already required by European and American technical specifications. Shot blasting is also used to treat concrete pavements in China. Perform maintenance.
3. Maintenance of asphalt pavement
Shot blasting equipment is widely used to improve the roughness and friction coefficient of asphalt pavement, thereby improving the adhesion of the road surface and ensuring driving safety. At the same time, it can also remove the attachments (such as fuel, engine oil, etc.) on the asphalt pavement. It is mainly used in the following aspects:
(1) During the construction of asphalt concrete overlay, the use of shot blasting technology for road surface pretreatment can ensure that the road surface is clean, and at the same time increase the surface roughness, strengthen the adhesion between the overlay layer and the original road surface, and the durability of the structure is greatly improved. Increase; the first shot blasting treatment of the slurry seal and the use of resin material to cover can greatly improve the bonding strength of the resin cover and the original base layer, so that the quality of the slurry seal is improved and the service life of the road surface is prolonged.
(2) The shot blasting process can be directly used on asphalt pavements, for example, roughening the surface of the turning section to improve the anti-skid performance.
(3) It can directly remove the oil on the surface of the asphalt pavement and improve the anti-skid performance caused by the oil on the road.
(4) Shot blasting can also be applied to the removal of marking lines.
The asphalt surface treated by the shot blasting process not only cleans up various surface attachments, but also increases the roughness of the asphalt surface and improves the performance of the asphalt pavement. Moreover, the construction of the equipment is simple, convenient, and flexible.
4. Anti-corrosion coating of steel bridge deck
The application of shot blasting technology in the anti-corrosion coating of steel bridges has been fully affirmed in our country. Most of the bridges under construction and already built choose to use the shot blasting process for surface cleaning and roughness treatment before anti-corrosion primer or other spraying. The use of shot blasting to treat steel bridge decks can meet the requirements of SA2.5/SA3 steel plate cleanliness, and can control the roughness to meet coating requirements, and the entire process is dust-free and easy to move.
Application of pavement movable shot blasting machine in steel bridge deck paving
Before paving the waterproof adhesive layer, the surface of the steel bridge deck needs to be sandblasted and derusted with a special shot blasting machine. First use a wire brush to remove the loose material on the surface of the steel plate, and then use a spatula to scrape off the thicker grease attached to the surface of the steel plate, and then clean the local oil-contaminated surface with an alkaline cleaning agent and rinse it with clean water.
The construction needs to be carried out under clear weather, no fog, and no rain, and the relative humidity of the air should not be greater than 90%; during the construction process, the site wind speed and surface temperature of the steel bridge need to be tested.
Shot blasting quality inspection adopts two methods: visual inspection and instrument inspection. The visual inspection is required to reach level 2.5 or above. The instrument inspection is to measure the roughness through the thickness method, and the thickness change is controlled within 60-120um.
Personnel in the shot blasting construction work surface need to wear special shoe covers to prevent surface pollution after shot blasting. After shot blasting, the steel balls are recovered in time, and the work surface after shot blasting is blown clean with a blower.
5. Municipal roads and paved roads
All kinds of road paving in the city can be cleaned by movable shot blasting machine to remove the markings on the road surface. For busy intersections, the road surface can be roughened to improve the roughness and friction coefficient of the road surface.
Why use a road shot blasting machine to clean the road markings?
Shot blasting machines can be divided into hand-push type, vehicle-mounted type and white line type according to the walking mode. Shot blasting method is mainly used for cleaning the marking of cement concrete pavement, especially suitable for the cleaning of normal temperature marking.
Its characteristic is that the friction coefficient of the road surface that has been cleaned by shot blasting will increase, which is beneficial to driving safety and will not generate a large amount of dust during the cleaning operation. It is especially suitable for cleaning the sidewalk adjacent to the old line on urban roads.
6. Preventive maintenance of airport runways
Concrete and asphalt runways remove tire tracks (except rubber), remove markings, restore and increase the surface roughness of the airport runway, and improve the friction coefficient of the runway.
7. Shot blasting machine for steel plate
The shot blaster can remove all rust, corrosion and mill scale from steel plate and provides ideal surface finish (SA 2.5) for securing a continuous and effective bond between the steel plate surface and coat.
How efficient is the road shot blasting machine?
The closed circuit road shot blasting machine completes the operation by hitting the road with steel shots. As the construction progresses, the steel shot has been worn out. According to actual calculations, the labor cost of the concrete pavement shot blasting machine is a pavement shot blasting machine, which can effectively process 2016-2500 square meters per day 8 hours. The consumption of projectiles is about 100KG, the machine is operated by two workers, the manufacturer of the road shot blasting machine handles a ground area of 10,000 square meters, and the consumption of the road shot blasting machine is about half a ton.
The portable road movable shot blasting machine is driven by a 380v three-phase electric power with a power of 35kw, and the electricity consumption is about 3.5 degrees per hour. If the equipment is continuously working all day, it needs to consume about 30 degrees of electricity.
Advantages of concrete pavement shot blasting machine
The pavement shot blasting machine floats and polishes the surface of the concrete, cleans up and removes impurities, and can perform a dozen surface treatments on the surface of the concrete to make the surface uniform and rough, greatly improving the bonding strength of the waterproof layer and the concrete bottom layer, making the waterproof layer and the bridge The panels are better integrated, and the cracks in the concrete can be fully exposed.
Pavement shot blasting machine is the best way to clean up the road surface waterproof pretreatment. It completely solves the shortcomings of large dust and poor effect of the previous road construction coatings. At present, many places have written this construction method into the acceptance specification. Concrete pavement shot blasting machine Very practical to ensure the safety of road and bridge projects.
After the closed circuit road movable shot blasting machine process, it has a clean and pollution-free surface with uniform roughness, which greatly increases the bonding contact area between the waterproof layer material and the bridge deck, and achieves the bonding strength and shear strength of the waterproof material and the substrate. The best combination to ensure the life of the bridge deck pavement. The bridge deck treated by the shot blasting process is suitable for the waterproof construction of a variety of materials such as waterproofing membranes, permeable crystalline waterproofing materials, polymer modified asphalt spreaders, and rubber asphalt waterproof intermediate layers.
What diameter steel shot is suitable for road shot blasting machine?
In the process of using the road shot blasting machine, what size steel shot should the customer choose? Briefly introduce the movement stability and throwing speed of steel shot particles in the shot blasting device of the road shot blasting machine.
Road shot blasting machine design drawing
(1) According to the statistics of test data, the stability of the ejection velocity of steel shot particles of different sizes is different.
When the particle size is about 0.5mm, it has a small ejection speed and a large standard deviation of the average velocity, which has an unstable ejection velocity; when the particle size is 1~2mm, it has a large velocity and a small standard deviation of the average velocity. Has a relatively stable throwing speed.
(2) According to the data provided by the road shot blasting machine engineer, steel shot particles of different particle sizes are thrown from the shot blasting machine at different speeds.
When the particle size is 0.5mm, the average speed of the steel shot particles is the smallest. With the increase of the particle size, the speed of the steel shot particles increases. When the particle size is 1~2mm, the steel shot particles have a larger ejection speed.
Based on the above statistics, the road shot blasting machine recommends to customers that the diameter of steel shot is generally 1.5mm.