Xiamen ring and crush classification and selection method of the grille
1 overview
1.1 the product name and definition
In the drainage engineering,) (type ring and crushing gratings are used to remove can jam pump and pipeline valve is relatively bulky suspended solids, and ensure the normal operation of the subsequent treatment facilities can, is composed of a set (or groups) of parallel metal bars and frame, tilt installed in the water channel, or feed water pump station at the inlet of the pump well, to intercept bulky suspended solids and impurities in wastewater.
1.2 product classification, the difference between gap
Ring and the grid type and classification is very much, in general can be divided into screen pipe machine, drum grille, transfer, no drum type gratings four categories. Drum: made of stainless steel coil or surrounded by stainless steel perforated plate into cylindrical device, is located in between the blade and the sidebar, to increase crushing type grille flow of parts.
The drum, the drum, double the number of the difference between drum drum, namely: no drum drum number is 0, single drum, the drum number is 1, double drum, drum number is 2.
For stainless steel drum material: general, special requirements can be made of nylon and other engineering plastic or fiberglass
Drum blade spacing: consistent with broken after particle size requirements
A grid ring 1.3 general technical requirements
Article gate clearance according to the types of sewage, flow, representative of sundry types and to determine the size, generally the range is as follows: mechanical cleaning gate: 3 ~ 25 mm; Artificial qing gate: 5 ~ 15 mm; Screen: 0.1 ~ 2 mm.
In large and medium-sized sewage station, would set up two screen machine: first for the coarse grid: 10 ~ 40 mm, the second for fine screen: 3 ~ 10 mm (large sewage treatment plant recommendation 15 mm + 4 mm). In the sewage plant, set up a grid, grid of the gap should be 3 ~ 15 mm (coarse grid with artificial grille can choose 15 mm, screen machine recommended by 5 mm).
Within the grid velocity: sewage channel in front of the gate of velocity should be controlled in 0.4 ~ 0.8 m/s, after a grille flow rate should be 0.6 ~ 0.6 m/s. A bar head loss associated with a grid velocity, generally should be controlled between 0.1 ~ 0.3 m. After the gate canal bottom should be lower than they did before the gate 0.1 ~ 0.3 m.
Grille effective water area according to the velocity of 0.6 ~ 0.6 m/s, but the total width of not less than 1.2 times of the width of the inlet pipe canal, grating Angle should be 45 ° ~ 75 °, if for artificial grille installation Angle is adopted at 30 ° ~ 60 °.
Grid must be set workbench, mesa should be higher than before the gate the highest water level of 0.5 m, the stage should be set up security and washing facilities. The workbench on both sides of the aisle width should not be less than 0.7 m. A positive width, when using artificial slag removal, should not be less than 1.2 m, when using mechanical slag removal, should not be less than 1.5 m.
Machine ventilation facilities shall be set up between grille, commonly used have axial flow fan. If the wastewater containing toxic gas grille should be set between the poisonous and harmful gas detection and alarm system. Large and medium-sized grating should be installed between the lifting device, convenient for daily equipment maintenance and grid slag removal.
The tine grille, link in water for a long time, in order to prevent rust corrosion, generally made from high strength plastic or stainless steel, the chain axis are also stainless steel.
2 classification product name
Screen machine can be divided into common use such as listed in the table above several kinds: pipeline crushing grille, no drum channel type crushing grille type, single drum channels type crushing grille type, double drum type crushing grille, transmission type crushing grille, etc.
2.1 choose the main technical indicators (or factors)
When choosing equipment need to control the main technical indicators are effective depth (groove depth), the effective width (gate) wide, the gate clearance, installation Angle, inlet water quality, water temperature, etc.
2.2 the main working principle
Shattered type grille is mainly composed of driving gear, gear box, cutting area, sealing components, framework, PLC control system, etc. Under the drive of motor, speed reducer drive, drive shaft, and then by the drive shaft through the gear drives the driven shaft, thus promote two groups do opposite rotary blade axis movement, flow to the follow-up process after smashing particles of the intercept, liquid through the subassembly and diversion gate clearance. The whole working status can be can be continuously continuously.
Due to crushing type grating is composed of a set of mutually rotating blade group, all through the rubbish through after the shattered into tiny particles, the blade is made of high independent of hard alloy after surface evenly after the hardening treatment, wear-resisting corrosion resistance.
Installed in the reducer output shaft end coupling running buffer device, slow start, run, mechanical shock.
Equipped with intelligent detection system of the control box, remote control; Stalling a motor current, invert times, inversion of time all can display and local setting; Can provide over-current protection, spit out of torque reversals, such as leakage, overtemperature fault protection.
Shattered type grille equipped with double blade shaft mechanical seal system to protect bearings, horizontal crushing is equipped with a double cone bearing and skeleton type or labyrinth seal to ensure stable operation under heavy load.
Stable and reliable running, convenient installation and maintenance, and can realize automatic operation. 3. Choose the point
The choice of the grille shall include the following main points:
Water quality, grid flow, grid position.
Grille well depth, width, grid velocity.
Installation Angle, height of discharge
According to the inlet water quality, water depth and types of the grille material can be determined. According to the traffic and grid velocity, installation Angle width of grating can be calculated. According to the bars grille location are used to determine the clearance.
4. Installation points
4.1 the master project
Grille decontamination machine installed on the base should be strong. Methods: to check the construction record.
Grille gate a center of symmetry and guide the symmetry center should comply with the requirements, grille gate of the longitudinal surface and guide side should be parallel. Methods: to check the construction records, observation to check.
Tine and the gate of the mesh should be no jam, clearance should be no greater than 0.5 mm, meshing depth should not be less than 35 mm. Inspection method: to observe the inspection, check amount of feet.
Grid operation position should be correct, no jam, kick a phenomenon. Overload device should be reliable. Within the grid piece of trash should not be dropped on the canal. Inspection method: to observe the inspection, check construction record.
Other types of decontamination machine installation should meet the design requirements. Methods: to check the construction record.
4.2 the general project
Grille decontamination machine should be accurate. Installation Angle deviation should comply with the regulations of products technical documents. Each frame of the connection should be strong. Methods: to check the construction record.
The fuselage longer grille decontamination machine should be reinforcement measures as required. Inspection method: to observe the examination.
Grille decontamination machine on both sides of the article and should be no greater than grille gate trench wall clearance clearance. Methods: to check the construction record.
Grille decontamination machine installation deviation should be allowed to meet the provisions of the table 11.2.9.
Table 11.2.9 grille decontamination machine installation allowable deviation and inspection method
The project will allow deviation (mm test method
1 equipment plane position 20 feet quantity check
2 equipment level + 20 level with ruler
Article 3 gate longitudinal surface and guide rail profile with fine wire with straightedge check parallelism 0.5/1000 or less
4 + / - 0.50 in equipment installation Angle protractor and sank inspection line5. Technical and economic performance analysis
The grille on the market variety, the price is different. As for village sewage treatment commonly used for artificial grille or rotary screen machine. Artificial grille is low in cost, and (artificial grille cost basically in several hundred to several thousand yuan floating) but the corresponding will increase artificial labor intensity, need artificial slag removal. But if water village sewage treatment station is small is the gate little slag, can use this form of grid, economic, convenient and good operation. Screen machine of the high cost (screen machine cost basically in the range of tens of thousands to tens of floating), but can reduce the manual labor intensity, and can realize automatic control. |
