Range of Belt Thickening and Dewatering Machine:
　　This standard indicates definition, sorts, requirement, text ways, inspecting rules’ sign, packaging, transportation and storage of belt thickening and dewatering machine.
This standard is proper for filter press machines which the sludge dewatered in the process of sewage treatment.

Standard quotation
　　The following items become standard items through the quotation. The later or revised versions of document are not proper for this standard which date is remarked. (except correction) But it is encouraged that parties which made the agreement make a research to decide whether these new versions are proper. New versions of documents which has no date are all proper for this standard.
　 GB/T 191 Pictorial signs of package, storage and transportation
GB/T 1184-1996 tolerance of shape and position no remarked tolerance
　 GB/T 1720 inspecting way of paint film adhesive force
GB/T 2649-1989 Sampling way of mechanical character test of welded joints
GB/T 2650-1989 Blow test way of welded joints
　 GB/T 2651-1989 Tension test way of welded joints
GB/T 2652-1989 Tension test way of welding line and weld metal　
GB/T 2653-1989 bending and squashing test way of welded joints
GB/T 8923-1988 Rusting level and rust removing level of steel materials’ surface before painting.
　　 GB/T 10894-2004 noise test way of separating machine
　　 GB/T 13306 label
GB/T 13384 Common technology conditions of machinery products package.
JB/T 5943 Common technology conditions of engineering welding items.
JB/T 7217 Common technology conditions of separating machine painting.
Terms and definitions:
The following terms and definitions are proper for this standard.
　　 1.1 steering roll
　　 Rolls that steer filter belts.
　　 1.2 live roll
　　 Rolls that transmit power.
　　 1.3 cradle roll
　　 Rolls that support filter belts.
　　 1.4 press roll
　　 Rolls that can press filter messes.
　　 1.5 tension roll
　　 Rolls that can tense filter belts.
　　 1.6 guide roll
　　 Rolls that can change the filter belt direct.
　　 1.7 discharge roll
　　 Designed for discharging.
　　 sorts and name of belt filter press machine:
2.1 sorts：
　　2.1.1 Effective belt width of filter belt of belt filter press machine (mm): 500、1000、1500、2000、2500、3000.
　　2.1.2 Ways of tension and correction of belt filter press machine are divided into two kinds: air power and hydraulic pressure.
Example: DYQ2000-A: It is air power controlled A type belt filter press machine which the filter belt width is 2000mm.
3.1 basic demands:
　　3.1.1 Products should meet this standard’s items and produced according to designs and technical documents agreed by established procedure.
　　3.1.2 Conformity certificates of materials and purchased parts should be available.
　　3.1.3 Welding parts’ welding lines should accord with stipulation JB/T 5943.
　　3.1.4 Sand spraying treatment is needed for the parts which use common metal materials to meet Sa2 1/2 level in regulation GB/T 8923. Then hot zinc spray, and zinc thickness must be no less than 80m. After that, the surface is painted by corrosion proofed paint, and its thickness is no less than 150m. Parts that may touch corrosive things must have a more than 200m thickness, and its quality must accord with regulation JB/T 7217.
　　3.1.5 Surface of live rolls and steering rolls should be patched by rubber, and its rubber mechanical character should meet form 1.
form 1 capability of rubber machine ：

　　3.1.6 Axial line’s parallel level of closing rolls and waves level of roll surface must be no less than the 10 level indicated in GB/T 1184-1996.
　　3.1.7 Static equilibrium test should be made on the rolls that diameter is more than 300mm. Its unbalanced moment must no more than 3m.
　　3.1.8 Insulating resistance of power line and protection ling must be more than 2m.
　　3.1.9 filter belt
　　Joint of the filter belt should be smooth and neat. Elongation strength must no less than 70% of filter belt’s elongation strength.
　　Tolerance of filter belt width is 10mm, Tolerance of filter belt length is 150mm, Elongation rate of filter belt is 0.65%-0.85%；
　　Life span of filter belt should be longer than 1500h.
3.2 performance requirements:
　　3.2.1 filter belt line speed range (m/min): dewatering step: 1.0～5.4
　　3.2.2 Blade of discharge cut should be parallel with cylindrical funicular line of discharge roll and touch closely with filter belt.
　　3.2.3 idle load test of belt filter press machine should accord with the following requirements:
Transmitting parts works normally and steadily.
　　Adjustment of reducer is step less. Adjustment should be correct, smooth and sensitive.
Hydraulic and air power system works agilely, exactly and reliably.
　　Hydraulic system is tested under the working pressure of 1.25 times of designed maximum. It should be ensured above 10min. pressure reduce can not beyond 10% of testing pressure.
　　Dead stop parts and electrical equipments work normally and steadily.
　　Flexure of filter belt should be avoided. Off tracking should be controlled. relative to rolls, off tracking of filter belt can’t exceed 10mm, and if it exceed 40mm, it will stop and alarm automatically.
　　3.2.4 The following items are requirements of belt machine load capability test:
Load capability test should be done after idle load test, and it should be done for no less than 8h consequently;
　　Off tracking and suddenly stop can not happen in the testing period.
Sludge dewatering capability : Filter mass water ratio can not be more than 80% for active sludge;
Filter mass water ratio can not be more than 75% for chemical sludge.
　　3.2.5 Washing sets should be installed, and make sure the filter belts are completely cleaned.
　　3.2.6 Designing life span of belt machine should be more than 10 years, and working time with no problem should be more than 3000h.
　　3.2.7 Noise of idle load running should not more than 80dB (A).
test method:
4.1 welding line mechanical character test
Execute according to regulation GB/T 2649、GB/T 2650、GB/T 2651、GB/T 2652 and GB/T 2653.
4.2 painting quality of belt filter press machine test
　　4.2.1 External appearance uses visual method.
　　4.2.2 Paint film adhesive force tested according to regulation GB/T 1720.
　　4.2.3 Paint thickness uses electromagnetic paint film thickness gauge.
4.3 Axial lines apart rolls parallel level test
4.4 insulating resistance test
4.5 effective width
test on filter belts’ life span
4.7 speed test on filter belt line
4.9 idle load test
　　 4.9.1 Check running state of all transmitting and rolling parts.
　　 4.9.2 hydraulic pressure and air power system inspection
Check flexibility, validity and reliability of systems by operating hydraulic pressure and air power system 3 times.
Tightness of hydraulic pressure system: examine the manometer, and check tightness of all outside parts.
　　 4.9.3 Check flexibility, validity and reliability of electrical system by operating it 3 times.

　　4.9.4 inspection on filter belt off tracking
On the base of discharge roll, test off tracking timely, and take the mix as the off tracking level. Precision of testing tools can not be less than 0.5mm.
　　 4.10 load capability test:
　　 4.10.1 The filter belt runs continuously for 8 hours at the peed of 3.0m/min~4.5m/min
　　 4.10.2 Filter mass water ratio test
　　 4.11 filter belt washing set and its effect.
　　 Use visual method.
　　 4.12 Confirmation of the whole filter press machine’s life span and working time with no problems:
Life span is confirmed according to the designing files. Working time with no problems is confirmed by researching 2 customers from 5.
　　4.13 Noise test:
　　Open the set and adjust the water pressure to maximum. Test noise with standard GB/T 10894.
rules of test:
5.1 Inspecting sorts of belt filter press machine
It includes delivery inspection and type inspection.
5.2 Delivery inspection of belt filter press machine
　　5.2.1 All products can’t delivered until certification is published by quality inspection department.
　　 5.2.2 test content:
　　 content and ways of delivery inspection
5.3 inspection on belt filter press machine model
　　 5.3.3 sampling ways:
Sample 2 machines from the qualified products.
5.4 judgment rules:
　　5.4.1 The inspecting result must accord with chapter 5 of this standard.
　　5.4.2 If unqualified products are found, more samples are needed. If more unqualified products are found, this lot is confirmed as unqualified products.
label, package, transportation and storage.
label
　　Label should be clear and in the proper position. Type and size should meet requirements of GB/T 13306. the following content should be indicated on the label:
Products name and model;
Main technical parameter:
　　Filter effective width (mm), filter belt line speed range, main engine power (kw), outward size (length*width*height) (mm), main engine quality (kg);
Identification number and production date;
manufacturer name
6.2 package
　　6.2.1 The label on belt filter press machine package must meet requirement of GB/T 191
　　6.2.2 Package should accord with regulation GB/T 13384.
　　6.2.3 Attached documents:
packing list;
products certification;
products instruction book (includes main accessories’ instruction book);
　 Accessories list.
6.3 Transportation and storage
　　6.3.1 Package of belt filter press machine should meet the requirement of water transportation and land transportation.
　　6.3.2 Belt filter press machine should be stored in storage or tent.