Meijun Environmental Sandblasting Room - Want to be checked by environmental protection? Want to work with environmentally friendly sandblasting standards? Then look at the characteristics of the wind recycling sandblasting room. Feature 1: Use a large wind suction filter device. Feature 2: Using wind to pump sand to the sandblasting machine reduces the wear of the conveyor belt of the elevator compared to the traditional lifting sandblasting room. , and the sand suction is smooth and even without sand blocking. Feature 3: The sandblasting operator will alarm and automatically stop when the sandblasting room arrives at the specified time to ensure safe sandblasting.

Environmentally friendly wind circulation sandblasting room

Honeycomb recycling sandblasting room

This set of equipment is mainly composed of sandblasting room body, sand suction floor, separator, storage hopper, sandblasting system, connecting air duct, dust removal system, discharge pipeline, electrical system, etc.

One: design standards

In order to meet the requirements of removing the embroidery on the surface of metal products,removing the oxide layer, improving the surface quality, and improving To meet the requirements of workers' labor environment and environmental protection, this set of pre-treatment equipment is specially designed - an environmentally friendly wind-driven sandblasting room and sandblasting equipment. The design of sandblasting room and sandblasting equipment is based on the principle of "scientific, reasonable, economical and practical", making full use of advanced technologies and processes at home and abroad, and carefully selecting high-quality supporting equipment at home and abroad to ensure the quality of workpieces and products. On the premise of the appearance level and environmental protection, the investment cost, operation and maintenance cost should be reduced as much as possible, so that the equipment ranks the advanced level in the same industry in China.

sandblasting room, painting room, sanding room

Citing relevant technical standards

We implement the following standards during the design, manufacture, installation and commissioning of this equipment:

GB 6514-2008 Safety Regulations for Painting Operation Safety of Painting Process and Its Ventilation and Purification

GB 7691-2003 Coating Operation Safety Regulations General Principles of Safety Management

GB 14444-2006 Safety Regulations for Painting Operation - Technical Regulations for Safety in Painting Booths

GB 14443-2007 Safety Regulations for Coating Operation - Safety Technical Regulations for Coating Drying Room

STZ21-2017 "Stationary Pressure Vessel Safety Technical Inspection Regulations"

GBJ 87-1985 Design Specification for Noise Control in Industrial Enterprises

GB 50205-2001 Code for acceptance of construction quality of steel structure engineering

JGJ 82-1991 Specifications for design, construction and acceptance of high-strength bolted connections in steel structures

GB 50017-2003 Code for Design of Steel Structures

GB 8923-1988 The rust grade and derusting grade of steel surface before painting

GB/T 11345-1989 Method of manual ultrasonic flaw detection of steel welds and classification of flaw detection results

GB 12348-2008 Environmental Noise Emission Standard for Industrial Enterprises

GBZ1-2002"Hygienic Standard for Industrial Enterprise Design"

Two: the working principle and characteristics of sandblasting room

After the fan is started, the outdoor air flows into the room through the dispersed air supply and noise reduction device installed in the chamber body, forming an air static flow layer in the cross section of the sandblasting chamber, pressing the indoor dust, cleaning objects, sand particles, etc. to the ground sand suction floor and dust removal air outlet. It is brought into the abrasive sorter through the sand suction floor, and the useful sand is separated from other wastes and dusts by the sorter. +After the secondary dust removal of the filter element, the dust flows into the trash can, and the clean air is exhausted by the fan at high altitude.

sandblasting room, sandblasting room

Technical features:

This equipment is the surface treatment sandblasting equipment with the highest technical content, the best quality, the longest service life and the best working environment in the sandblasting industry. Compared with the traditional sandblasting equipment composed of auger and bucket elevator It mainly has the following four advantages:

1, using the sand suction floor technology independently designed and developed by our company, reducing the depth of the pit can save a lot of infrastructure costs; very little maintenance and simple and easy (basic Maintenance-free, saving a lot of maintenance costs every year); high visibility, easy to observe the workpiece processing and have a good working environment.

2, equipped with a unique abrasive sorter, which can remove broken sand and dust from the recycled abrasive, so that the blasting process maintains a stable cleaning efficiency.

3, a filter-type dust removal unit that installs the world's top-level aerodynamic + filter element for two-stage dust removal. Small size, long life and easy maintenance, its dust removal efficiency can reach 99.9%, which meets the national environmental protection emission standards.

4, color steel sound-absorbing sandblasting chamber with good noise reduction, high corrosion resistance, good noise reduction effect and beautiful appearance.

Environmental sandblasting room

3. Composition and structure description of supporting ancillary equipment

This set of equipment is mainly composed of sandblasting room, sand suction floor, separator, storage hopper, sandblasting system, connecting air duct, dust removal system, discharge pipeline, electrical system, compressed air system, etc.

Sandblasting room: The sandblasting room includes the chamber body, muffler device, gate, lighting system, etc.

1.1 Chamber body: the chamber body is composed of color steel plate, section steel, steel plate and rubber plate

The sandblasting room is made of profiled steel as the basic frame, lined with steel plates, and made of color steel sandwich panels on the outside, with beautiful appearance, convenient installation, anti-corrosion and durability. At the same time, it has the function of noise reduction and thermal insulation. The chamber is lined with a white rubber sheet, and at the same time the rubber sheet plays a certain role in damping and silencing.

1.2Muffler device: When the equipment is working, the only thing connected to the outside of the chamber is the air inlet of the chamber. Noise pollution from outside. We use the noise cancellation technology of the aero-engine test bench to set up a noise reduction device at the air inlet of the sandblasting chamber, which can convert the 1000~2000Hz shrill sound into soft bass below 500Hz, and can prevent the sand sprayed from sandblasting from splashing out of the chamber through the air inlet, and this device also plays the role of equalizing flow in the room , so that the airflow is redistributed indoors and evenly settled.

1.3Gate system: One end of the equipment room is equipped with a split gate, the material is the same as the wall panel, and the net size of the gate is: 2500×2500 (W×H) for workpiece entry and exit. Open on the gate Φ350mm sight glass window, easy to observe indoor working conditions.

Blasting Room

1.4Lighting system: Lighting lamps are installed on the top of the room body, and the indoor illuminance is greater than 500Lx. All light boxes use Yaming energy-saving lamp lighting system, which is safe, energy-saving and easy to maintain. 6 at the top.

Sand suction floors:

2.1 Sand suction floor is a honeycomb-like structure made of a series of metal steel plates after accurate calculation, and its thickness is generally within 400mm< /st1:chmetcnv>~500mm, the whole equipment can be directly installed on the ground, and the falling sand particles can be taken away by the wind, sorted and recycled. The ordinary traditional sandblasting machine uses the auger and bucket elevator to transport the sand, and the sand is dropped.

The sand is collected into the auger through a collecting hopper. Because the artesian angle of the sand grains is 45 degrees, the inclination angle of the hopper is generally 45 degrees to make the sand grains Slide down smoothly into the auger, so ordinary traditional equipment is bound to need a deep pit to accommodate the huge collecting hopper and auger. The deep pit has a problem of water seepage. The junction of the auger and the bucket elevator is the bottom point of the deep pit. Whenever the work stops, there will always be a pile of sand in this place. If the waterproofing is not done well, this pile of sand is very easy to be damp and hardened. Before starting the machine, the workers have to go down and break the sand to break the sand, so it is extremely inconvenient to use. Therefore, in order to prevent water seepage in deep pits, multiple waterproof layers must be made. It takes a considerable amount of money to make deep pits and waterproof layers. These costs are not included in the equipment quotation and are borne by the users themselves. Therefore, the sand suction floor technology removes deep pits and waterproof layers, saving users a lot of hidden costs. Included construction costs.

2.2Reduce maintenance and reduce downtime

The sand suction floor does not have any moving parts, and the maintenance is small and easy to maintain. Simply replace the gusset at the duct elbow every 1-2 years of continuous use. Completely abandon the old and cumbersome sand conveying machinery such as auger, scraper, bucket elevator required by ordinary sandblasting equipment, and use wind to convey sand, and high-speed airflow is sucked from the bottom of the sand suction floor to remove dust and reused sand. delivered to the sorter. It avoids the serious wear and heavy maintenance of the sand conveying machinery and transmission machinery during the conveying process of the bullet sand, thereby reducing the downtime rate.

2.3 Provides clear visibility in the blasting chamber to improve worker productivity

The traditional sandblasting room generally adopts the upward suction method, that is, there are several air suction ports in the upper part of the sandblasting room. This method can absorb dust, but the rising dust makes the visibility inside the sandblasting room extremely poor, and workers cannot. Observed the impact effect of the workpiece, some places that have not been sprayed or missed can only be found after stopping the work and waiting for the indoor dust to dissipate, which invisibly reduces the work efficiency. Since the introduction of the sand suction floor technology, the ordinary traditional sand blasting equipment has also been improved, that is, several suction ports are opened on the collecting hopper, and the surface is similar to the upper air intake and lower air suction of the sand suction floor. However, these several air suction ports cannot be all located on the surface of the sandblasting chamber, so several airflow columns are bound to be formed in the sandblasting chamber, and a vortex area is formed around the airflow column. Dust stays in the vortex area for a long time, and it cannot make the blasting room achieve the effect of true high-definition visibility.

Since the honeycomb-like structures of the sand-absorbing floor are all located on the surface of the sandblasting chamber, the working method of , the upper air intake and lower air suction of the sand blasting chamber, so that the entire The uniform airflow from top to bottom is formed in the sandblasting chamber, which effectively suppresses the dust generated by sandblasting, so that the sandblasting chamber can produce clear visibility, and the impact effect of the workers on the workpiece is directly visible, thereby improving the work efficiency of workers. It also brings a clean working environment to the operators and avoids occupational diseases caused by the traditional sandblasting environment.

3, Sorter: a two-stage sorting device consisting of a pneumatic separator and a filter screen, a particle size adjustment device, a gravity sand loading device, a sand storage bucket and a pneumatic sand loading device composition.

In the process of sand recycling, useful bullet sand, debris and dust will be mixed together. If not treated, the treatment efficiency will be reduced when sandblasting again. A suction port is added on the sand path as a sorting device, but this method cannot be completely sorted. Because the sand thrown by the bucket elevator is lump-shaped, the air suction port can only sort the surrounding dust and impurities in a lump of sand, and the dust and impurities wrapped in the middle of the lump cannot be separated at all. Therefore, useful sand, useless debris and dust will be mixed together, and the processing efficiency cannot be guaranteed.

Our sorter utilizes the principle of aerodynamics and the characteristics of wind-driven sand conveying to continuously, uniformly, stably and thoroughly sort the abrasive during the continuous and uniform sand conveying process of the sand suction floor. According to the inertia of different particle sizes, impurities, broken sand and dust in the recovered sand can be removed, so that the sandblasting process maintains a stable cleaning efficiency. Adjusting the particle size adjusting device as needed can separate crushed sand and dust of different particle sizes.

When the sandblasting tank gives a signal that sand needs to be added, the pneumatic sanding device will add the abrasive in the sand storage hopper into the sandblasting tank. When the sandblasting tank gives a signal that the abrasive is full, the pneumatic sanding device is closed and the sanding is stopped.

4, sand blasting system: including sand blasting tank, spray gun, special protective clothing, this equipment is provided with 1 Sandblasting pot, 2 put 8-Φ12 span>Nozzle secondary air intake high speed spray gun.

4.1 Sandblasting tank: Our company entrusts a professional pressure vessel manufacturer to manufacture in strict accordance with the "pressure vessel specification". The product holds a formal certificate of inspection by the Labor Bureau. The volume of the sandblasting tank is 0.3m3, and the start and stop of the sanding work is controlled by a delay.

4.2System composition: shot blasting tank, combination valve, blanking valve (mushroom head), 2/2-way solenoid valve (inlet), 2/3-way solenoid valve (deflation), two-position four-way solenoid valve (sand blasting), material level gauge, globe valve, pneumatic sanding valve, sand mixer, sandblasting hose, spray gun, nozzle and control system.

• Quantity: 1 set

• Dimensions of blasting tank: Φ800×1600 (mm)

•Blast tank volume:0.3m3

• Number of Guns: 1/can

• Spray gun control mode: button control start and stop, independent switch

•Blast gun diameter and material: 8-Φ12mmCarbonized Boron Nozzle

•Sandblasting hose specification: DN25/DN32″inner diameter high pressure wear-resistant hose, long10m /roll

•Working pressure: 0.4~0.7Mpa adjustable

• Compressed air consumption: 6-9 m3/min/single gun

• Compressed air moisture content: <0.889g/m3

•Working abrasive: quartz sand.brown corundum sand, steel grit, steel shot, etc. (specification Φ0.1~2.0mm)

Environmental sandblasting room

Sand lifting fan:

• Motor power: 13-15kW

According to the requirements of processing different workpieces, the amount of pellets and compressed air of the pneumatic sanding valve can be adjusted according to the actual situation. The spray gun itself also has the function of blowing gun, so as to clean the shot and dust on the workpiece. The exhaust pipe of the blasting tank is introduced into the blasting room to reduce the noise pollution to the surrounding environment when the blasting tank is exhausted.

The spray gun is a supersonic high-speed spray gun, which has a venturi-shaped nozzle. When the airflow enters the contraction section of the high-speed sandblasting gun, it begins to accelerate. When it reaches the straight section of the venturi, the airflow speed is stable, and the airflow reaches the venturi. expansionIn the supersonic stage, the airflow expands sharply, and the nozzle sucks a large amount of auxiliary air from the secondary air supply holes distributed around the circumference to further accelerate the sand. The shrinking section, straight section and expanding section of the blasting gun are all made of boron carbide, with a working life of 600 hours or more( Abrasive selection and ratio must be correct ,blast gun can not be beat and barrel stamped ).

4.3Special protective clothing:

The sandblasting room is equipped with special air-conditioned protective clothing for workers. The protective clothing has the function of protecting the head and upper body. The protective clothing is connected to the outdoor compressed air that has been decompressed and filtered, so that workers can always breathe clean air when working. And adjust the temperature according to your own requirements. Protective clothing includes air filter, temperature regulator and protective clothing air temperature regulator uses filtered compressed air as energy, the temperature can be adjusted at any time, and the compressed air pressure is 0.4-0.7Mpa span>, the temperature adjustment range is 10℃-40℃.

5Dust removal system

A new type of dust collector with two-stage dust removal technology. Sand blasting room dust removal system and sand suction system share two sets of fans. The dust collector adopts the new technology of aerodynamic separation and filter element dust removal. Each group of units is equipped with a set of vertically arranged conical aerodynamic separators (primary dust removal) and layered filter elements (secondary dust removal). The pulse controller controls the pulse valve to periodically blow back the filter element with compressed air, and use a trolley with an ash bucket to clean the dust in the ash storage hopper.

Aerodynamic Separator:

According to the principle of aerodynamics, the larger dust particles are pre-separated as the primary purification. The aerodynamic separator consists of a series of tapered rings, the size of the rings decreases from top to bottom, and the gap between the rings is about 25mm. The dust-laden gas enters from the top and is continuously decompressed and separated after passing through the ring body. Air and part of the fine dust run out from the gap between the ring and the ring. Most of the dust falls into the ash bucket from the bottom of the conical ring. The dust removal efficiency is 92%, which greatly reduces the dust removal load of the secondary filter element, thereby improving the service life of the filter element as a fine filter.

2) filter element dust collector: the structure adopts composite filter material radially stacked into a hollow length of countless folds

Cylinder, compact structure, so the filter area of ​​filter element is far

It is larger than its surface area, which is the filter area of ​​the bag filter.

30 times. The surface of the filter element has a layer of composite material covered with ultra-fine and ultra-thin sub-micron diameter fibers. The dust removal efficiency is 99.9%, which can capture 0.5 micron extremely fine dust particles, and the surface is smooth, no dust will adhere, and no dust will penetrate into the filter material to achieve surface filtration. At the same time, the dust accumulated on the surface of the filter material can easily fall off during the reverse pulse cleaning process of the compressed air. The result is higher filtration efficiency with longer service life and lower operating costs.

3) ash cleaning system: it consists of a pulse controller and a pulse valve. According to the dust load of the equipment, the pulse controller sets the appropriate pulse frequency to control the pulse valve to blow back the cleaning. Ash.

4) dust collection device: it is composed of a dust outlet valve, a connecting hose, an ash bucket and a trolley that can be directly pushed and pulled.

When the ash storage hopper is full of dust, open the dust outlet valve, and the ash storage hopper will

The ash falls into the ash bucket through the connecting hose, and the ash bucket is transported away with a trolley and the dust is removed.

5) dust collector specifications and related parameters

•Model: 2×12 cores

• Filter specification: Φ324×660 (mm)

• Filter expansion area: 24m2/

• Running resistance: initial resistance 100~120Pa, final resistance 1000~1200Pa

• Outlet emission concentration: <100mg/ m3

• Filtration efficiency: 0.5μm of dust, the efficiency is in Above 99.99

• Compressed air consumption required for pulse backflushing: 0.5 m3/min

• Compressed air pressure required for pulse backflushing: 0.45Pa

• Pulse Controller: DMK-4CS

• Electromagnetic pulse valve DMF-2M-25

6) fans, chimneys(See the situation of the factory, Can be changed to the exhaust pipe to drain to the outside)

The domestic well-known Nantong centrifugal fan is used, and the fan is equipped with a muffler cover, and the noise reaches the environmental protection standard stipulated by the state. The chimney is grounded for lightning protection.

7) fan specifications

Sandblasting room dust removal fan:

• Motor power: 11kw

6, control system: electronic control system contactor, thermal relay, centrally controlled programmable controller and other main electrical components, high-quality electronic components assembled by domestic famous factories All parts of the system are equipped with automatic interlocking, so that the production is safe and reliable. Each motor operation control circuit is equipped with corresponding low-voltage circuit breakers, thermal relays and other protection elements to achieve short-circuit and overload protection of the motor. The metal casing of the entire electrical equipment is all protected by zero connection. In order to ensure the order and safety of the work, the interlocking of the fan to the sandblasting, the interlocking of the blanking to the sandblasting, and the interlocking of the gate to the trolley are adopted. Control requirements:

(1) Control the opening and closing of the compressed air valve entering the blasting tank, the opening and closing of the blasting tank pressurization valve and the venting valve;

(2) to control the start and stop of the spray gun;

(3) to control the start and stop of the sanding device;

(4) to control the start and stop of dust removal equipment;

(5) to control the light switch;

(6) to control the start and stop of the fan;

Disadvantages of Ordinary Traditional Sandblasting Equipment:

Ordinary traditional sandblasting equipment transports sand through auger and bucket elevator. The auger and bucket elevator are very easy to be damaged in this high dust and high wear environment. During maintenance, because the auger is very low from the ground, Generally in 200mm or so. Workers have to complete a series ofThe maintenance work is very intensive, and a maintenance may take several days, resulting in a high downtime rate. The increase in the downtime rate also means that the efficiency of the equipment is reduced.