Things, such as rust, but sometimes a specific surface layer is obtained by shot peening. Shot blasting media can be sand, silicon carbide particles, small steel balls, etc. The steel grit thrown by the shot blasting machine hits the surface of the object through the rotation of the blade. In 1930s, American companies made the world's first shot blasting machine. The production of shot blasting strengthening equipment in China began in the 1950s, mainly imitating the technology of the former Soviet Union. In the early 1960s, Qingdao designed and produced Q3 1 lO drum shot blasting cleaning machine, which marked the transformation of shot blasting technology and equipment in China from pure imitation to independent research and development, and China began to have professional shot blasting equipment manufacturers. Over the years, the shot blasting technology and equipment have been improved day by day, and the performance has been continuously improved. Its application scope extends from simple surface cleaning in foundry industry to metallurgical mines, machinery manufacturing, automobiles and tractors, weapons manufacturing, textile machinery, ships and vehicles, aerospace and other different industries, and its process scope also extends from surface cleaning of castings and forgings to strengthening, surface treatment, shot blasting and other different fields of metal structures. After decades of continuous development, shot blasting machine has developed from traditional fixed to mobile, from horizontal to vertical. Shot blasting machine has developed from a single machine to a field, from a single production process to a part of the whole production process. Shot blasting machine is constantly extending to every industry, which brings great convenience to the production process of every industry.
Edit this paragraph II. Application scope of shot blasting machine
1 Cleaning of metal surface
Shot blasting equipment was first used in foundry industry to remove sand and scale on the surface of steel castings and iron castings, almost all steel castings and gray castings, 130-2.5RK shot blasting machine.
Masteel parts and ductile iron parts should be shot peened. This is not only to remove the scale and sand on the casting surface, but also an essential preparation procedure before casting quality inspection. For example, the shell of a large gas turbine must be shot blasted before nondestructive testing to ensure the reliability of the test results. In general casting production, shot peening is an essential technological means to find surface defects of castings, such as subcutaneous air holes, slag holes, sand sticking, cold insulation, peeling and so on. Surface cleaning of non-ferrous metal castings such as aluminum alloy and copper alloy is not only to remove oxide scale and find surface defects of castings, but also to remove burrs of die castings by shot peening, so as to obtain decorative surface quality and comprehensive effect. In the production of metallurgical steel, shot peening or pickling is a process method to remove phosphorus skin by mechanical or chemical combination to ensure high productivity in large-scale production of steel. In the production of other alloy steel plates and steel strips, such as silicon steel sheets and stainless steel sheets, annealing is needed during cold rolling, and then shot blasting or pickling is carried out to ensure the surface roughness and thickness accuracy of cold rolled steel plates.
2 Strengthening of metal workpieces
According to modern metal strength theory, increasing dislocation density in metal is the main direction to improve metal strength. Practice has proved that shot peening is an effective technological method to increase the dislocation structure of metal. This is of great significance to some workpieces that need further strengthening on the basis that some metals cannot undergo transformation hardening (such as martensite quenching) or realize transformation hardening. Aviation, aerospace industry, automobiles, tractors and other parts require light weight, but the reliability requirements are getting higher and higher. The important technological measure is to improve the strength and fatigue strength of parts by shot peening.
Edit the third paragraph. Model classification of shot blasting machine
Classification of shot blasting machine
According to the different structure of shot blasting machine, shot blasting machine can be divided into drum type, chain plate type, rotary plate type, trolley type, squirrel cage type and suspension type. Drum and chain shot blasting machines are suitable for cleaning small and medium-sized castings that are not afraid of collision. The roller shot blasting machine relies on the spiral guide rib in the cylinder to turn the casting forward. The chain-plate shot blasting machine makes the casting turn over through the movement of the chain plate. Rotary, trolley and suspension shot blasting machines are used to clean large and medium-sized castings, and usually have a fixed shot blasting chamber in which the cleaned castings rotate or move. The shot blasting room is generally equipped with a number of shot blasting devices, which are installed in different positions and shoot shots from different directions to improve the cleaning efficiency and quality of the shot blasting machine. The hanging shot blasting machine can install several hooks on the hanging chain to clean the castings as needed. When cleaning, the casting is hung on the hook and turns itself over while running forward. Castings are loaded and unloaded outdoors and cleaned indoors. According to the working system, it can be divided into intermittent and continuous shot blasting machines. Shot blasting machine is mainly composed of four parts: ① Shot blasting machine generally uses high-speed rotating impeller to throw the projectile in a certain direction under the action of high centrifugal force. During the working process, some shot blasters can swing or move up and down at a certain angle. ② Projectile collection, separation and conveying system. (3) The bearing body that enables the casting to continuously run and turn over in the shot blasting cleaning process. ④ Dust removal system. Blasting room: No deep pit (or pit) is needed, with low capital construction cost and short construction period. The equipment of shot blasting machine is mainly composed of shot blasting machine, wear rubber endless belt, auger, hoist, separator, feed conveyor, dust collector and cleaning machine.
1 drum shot blasting machine
Drum shot blasting machine mainly uses high-speed rotating impeller to throw the shot at the workpiece rotating in the drum, so as to achieve the purpose of cleaning the workpiece, which belongs to the category of casting machinery. Suitable for sand cleaning, derusting, descaling and surface strengthening of castings and forgings under 0/5 kg in various industries. Drum shot blasting machine is suitable for cleaning all kinds of castings and forgings that are not afraid of collision and scratch. It is an ideal equipment for cleaning residual sand and scale on the surface of workpiece in small heat treatment workshop. It is mainly composed of roller, separator, shot blasting machine, hoist and deceleration motor.
2 crawler shot blasting machine
Crawler shot blasting machine is suitable for surface derusting or shot blasting strengthening of various large and medium-sized mass-produced workpieces, and the workpiece to be cleaned must be a single-weight crawler shot blasting machine that is not afraid of collision.
For castings and heat-treated parts below 150kg, the machine can be used for single machine and wiring. Belonging to the field of casting machinery. Automatic: Put the workpiece into the rubber crawler drum, the operator presses the "Run" button, the door of the shot blasting chamber closes pneumatically, the shot blasting cleaning starts, the crawler moves forward and the workpiece rolls continuously. High-efficiency and powerful shot blasting device throws shot blasting at high speed to the surface of rolling workpiece, and the workpiece is thoroughly and evenly cleaned. Steel balls flow into the screw conveyor through the sliding holes on the crawler, and then are transported to the bucket elevator, which is lifted to the separator for storage. After the shot blasting is finished, the door of the shot blasting room automatically opens, the crawler rotates reversely and the workpiece is discharged. Scope of application: cleaning and polishing of die castings, precision castings and precision forgings. Remove the surface scale of heat-treated parts, castings and forgings. The reinforcement of the spring. Rust removal and pretreatment of fasteners.
3-hook shot blasting machine
As the standard model of shot blasting machine, the hook shot blasting machine has a working cylinder with a diameter of 900 to 1300 mm and a height of 1300 to the hook shot blasting machine.
2200 mm. 2-7 throwers are standard, and the maximum load is 10000kg. This shot blasting machine has high production efficiency and great flexibility. It is an ideal cleaning and strengthening equipment with simple operation. Just load the workpiece to be processed on the machine, press the start button, and after a while (usually 5-7 minutes), that is.
Four-turn table shot blasting machine
Rotary table shot blasting machine is mainly suitable for mass production of surface cleaning of small and medium-sized workpieces. The equipment in this specification is applicable to engine connecting rods, gears, diaphragm springs, etc. Widely used in casting and automobile manufacturing, it has the characteristics of high production efficiency, good sealing effect, compact structure, convenient loading and unloading and high technical content.
5 steel plate pretreatment line
Shot blasting machine for steel plate pretreatment line is a multifunctional steel plate pretreatment line, which is used to clean welded structural parts, H-beam, steel plate, grille and steel plate. Steel shot blasting machine
The layout of the device is multi-angle, and the world's advanced unit disc blade high-efficiency shot blasting cleaner is selected to shoot high-speed and dense shot beams, which hit all parts of the original steel for three-dimensional and all-round cleaning, so that the rust layer, welding slag, oxide scale and dirt on all surfaces of the steel can quickly fall off, and a smooth surface with certain roughness can be obtained, which improves the adhesion between paint film and steel surface, fatigue strength and corrosion resistance of steel and the internal quality of steel. The main functional parts of the machine are cleaning room, indoor conveying roller table, feeding and discharging conveying roller table, shot blasting machine, shot blasting circulation system (including elevator, separator, vertical and horizontal screw conveyors, shot recovery mechanism and shot supply pipeline), purging mechanism, dust removal, electrical control and other parts.
6. New shot blasting machine
Automatic shot blasting machine for large oil tank of hull
This has high environmental protection and cost performance. It adopts a hidden shot blasting system, and uses a high-performance shot blasting machine to quickly push the steel shot to the ground and the surface of the steel plate to achieve the purpose of cleaning. Can be divided into vertical mode and horizontal mode. Vertical shot blasting machine is mainly suitable for cleaning oil tanks, maintaining water tanks, cleaning hulls, and cleaning the inner and outer walls of domes and spherical objects. Horizontal shot blasting machine is mainly suitable for paint cleaning, ship deck specific cleaning, road and bridge anti-sliding performance recovery, asphalt immersion cleaning and so on. Regardless of the vertical or horizontal cleaning mode, the shot blasting machine can be quickly disassembled and assembled within 20 minutes. The lifting system of the vertical shot blasting machine is installed on the electric fixture and placed on the top of the cleaned object. The operator controls the machine and winch through the wireless remote controller, so that the shot blasting machine can move up and down and left and right conveniently, and the abrasive can automatically circulate without stopping feeding. Moreover, only one person is needed to control production, which is very convenient, reduces labor and improves production efficiency. Steel shot and pollutants enter the separation chamber. The dust collector recovers dust and pollutants. Available shot peening is returned to the storage hopper and circulated. There is a cylinder under the dust collector. It's easy to dispose of waste. Cleaning the shot blasting machine can reduce the cost to only a few cents per square meter, which greatly saves the production cost. Mesh belt shot blasting machine is a kind of functional shot blasting cleaning equipment for cleaning discs, sheets, castings, machine bodies and structural parts. Can be used in the original state of the steel mesh belt shot blasting machine.
The surface of steel and castings is shot blasted to remove rust layer, welding slag and scale, so as to obtain uniform metallic luster and improve the coating quality and anti-corrosion effect of steel. Mesh belt shot blasting machine is mainly used in automobile, aerospace, railway and machinery manufacturing. The continuous metal mesh belt type shot blasting machine designed and built allows parts to rotate through automatically and continuously, and accepts shot blasting cleaning in multiple directions. The hub type shot blasting head maximizes the shot blasting efficiency and prevents parts from colliding with each other to damage the surface of parts. The blast cleaning machine for the inner and outer walls of the fan tower can also clean the inner and outer walls of large pipelines. Its characteristics are low cost and high efficiency.
It is an ideal technology to clean the inner and outer walls of wind turbine tower by shot blasting technology. This machine is mainly used to clean the inner and outer walls of large pipelines and steel tanks, so that there is no scale, old paint and other attachments on the surfaces of pipelines and steel tanks. After obtaining a certain surface roughness, a protective layer can be coated on the surface to improve the adhesion of paint film, fatigue strength and corrosion resistance of the workpiece, improve the internal quality of the workpiece and prolong its service life. Shot peening machine for cylinder inner wall uses shot peening technology to clean cylinder inner wall. It is a new type of shot peening machine for the inner wall of net bottle. It is mainly driven by compressed air, which accelerates the projectile to generate certain kinetic energy and sprays it to the inner wall of the steel cylinder. When the steel cylinder is positioned in the spray gun chamber, the spray gun will automatically extend into its own bottle, and the spray gun will move up and down in the chamber to complete all-round spray cleaning of the inner wall of the bottle. It is the type selected by the gas cylinder industry. The main advantages are as follows: 1. Remove the oxide scale in the inner cavity of the vial and the attachments generated during wire drawing to obtain a clean metallic color. After treatment, the cleanliness of the inner surface of the workpiece reaches SA 2.0-2.5 (GB 8923-88). 2. Eliminate the residual compressive stress caused by firing and drawing of the bottle body, and improve the fatigue strength limit and stress corrosion cracking resistance of the cylinder body. 3. Improving the quality of the inner cavity of the steel cylinder is conducive to improving the anti-corrosion effect and the permanent service life of wear resistance, anti-corrosion and anti-impact vibration; 4. This machine can realize automatic cleaning modes such as automatic bottling, conveying arrangement, pressing and positioning, turning over 90 degrees, spray gun extending into the bottle, automatic rotation of the cylinder, and moving the spray gun up and down to clean the cylinder. It is the only machine in China that can clean the inner wall of small bottleneck with a perfect projectile circulation system and advanced dust removal system. 7. Hanging chain shot blasting machine is suitable for shot blasting of large quantities of small and medium-sized workpieces. The workpiece can run continuously or step by step with the lifting chain, or the advanced product-loading-unloading-pushing lifting chain can be used to transport the workpiece, so that the workpiece can be parked in the loading and unloading area and the shot blasting area respectively, and the fixed-point loading and unloading and fixed-point shot blasting processes can be realized. The hanging weight of the hook is 50-2000 kg, which has high production efficiency and reliable operation, and is especially suitable for workpieces with complex surfaces and cavities, such as engine cylinder heads and motor housings. It is an ideal choice for automobile, tractor, diesel engine, motor, valve and other industries. Hanging chain shot blasting machine can be divided into continuous, stepping and stacking according to its hanging chain movement mode. According to the layout of the chain, it can be divided into single stroke, double stroke and multi-stroke Continuous type is a working mode in which the workpiece is hung on the chain hook, continuously enters the cleaning room through the shot blasting room at a uniform speed, and is driven by the rotating mechanism to rotate, advance and receive cleaning. Step-by-step method is to group the hooks of the workpiece (generally three hooks are a group), and the number of hook groups depends on the customer's working frequency requirements and the length of the whole cleaning line. Its working sequence is feeding → waiting → shot blasting (rotating) → waiting → blanking → waiting → feeding. Stacking is to park an empty car at a fixed point in the workpiece loading area and wait for loading. After the loading work is completed, the car stopper will be automatically released. Before the trolley runs to the shot blasting room, the trolley is in a waiting state, and the workpieces hoisted by a group of trolleys in the shot blasting room are being shot blasting cleaned and strengthened. When the car in the shot blasting room leaves the shot blasting room after the shot blasting work is completed, the stop of the waiting area is automatically released and the car enters the shot blasting stage; At the same time, the car behind is waiting; After the trolley workpiece is cleaned (strengthened), it will automatically run to the waiting area to wait for blanking. Working in this continuous cycle.
Edit this paragraph 7 pavement shot blasting machine.
Shot blasting machine for Wushi Expressway
Working principle of pavement shot blasting machine;
The working principle of the road surface shot blasting cleaning machine is that the shot material (steel shot or sand) is projected onto the working surface at a high speed and a certain angle by mechanical method, so that the shot material impacts the working surface, and then the shot material and the cleaned impurities are recovered separately by the airflow cleaning function of the vacuum cleaner in the machine, so that the shot material can be reused. The machine is equipped with a vacuum cleaner to realize dust-free and pollution-free construction, which not only improves efficiency, but also protects the environment.
Working conditions of pavement shot blasting machine
1, roughness of working face
work efficiency
Cement surface: working efficiency: 200-400 square meters/hour? Working on steel plate: steel plate quality grade SA 2,5 to SA3 speed: SA 2,5 is about 4m/min；; Speed: SA3 is about 3m/min, and the hourly treatment area: SA2, Grade 5, about 75-1100m2/h.
Edit paragraph 4. Derusting grade of shot blasting machine.
The national standard GB 8923-88 "Steel Surface Modification Grade and Derusting Grade before Painting" divides the derusting grade of shot blasting machine into four grades, which are indicated by the letter "Sa". Sa 1 mild spray or projectile derusting. There is no visible grease or dirt on the steel surface, and there is no scale, rust and paint-coated shot blasting machine derusting effect diagram.
And other accessories. Sa2 Thoroughly spray or rust. There should be no visible grease, dirt, scale, rust and other attachments on the steel surface, and the residue should be firmly attached. The dents formed by shot peening are evenly distributed on the surface of steel, and the anti-skid coefficient reaches 0.35 ~ 0.45Sa2.5, so it can be completely derusted by spraying or shot peening. There should be no visible attachments on the steel surface, such as grease, dirt, scale, rust and paint coating, and any remaining traces can only be slight spots in spots or stripes. The protruding dents formed after shot blasting are evenly distributed on the steel surface, and the anti-skid coefficient reaches 0.45 ~ 0.5SA3, so the steel can be sprayed or shot blasted for rust removal. The steel surface should be free of visible grease, dirt, scale, rust and paint, and the surface should present a uniform metallic luster.