Some standard content:
Machinery Industry Standard of the People's Republic of China
JB/T7257-94
Crane-type lifting plate scraper
Published on July 18, 1994
Ministry of Machinery Industry of the People's Republic of China
Implementation on July 1, 1995
Machinery Industry Standard of the People's Republic of China
Crane-type lifting plate scraper
Subject content and scope of application
JB/T 725794
This standard specifies the model, specification and basic parameters, technical requirements, test methods and inspection rules, marking, packaging, transportation and storage of crane-type lifting plate scrapers (hereinafter referred to as scrapers) for horizontal flow grit chambers. This standard is applicable to crane-type lifting plate scrapers for scraping off sand (mud) at the bottom of rectangular grit chambers and primary sedimentation tanks in sewage treatment projects and floating objects on the surface.
Referenced standards
GB3768
GB4720
GB11352
GB10183
GBJ·17
GBJ205
Basic technical requirements for motors
Determination of sound power level of noise source-simple methodElectrical control equipment: Part 1 Low-voltage electrical appliances and electrical control equipmentCasting carbon steel parts for general engineering
Manufacture and installation tolerances of bridge and gantry cranesDesign specification for outdoor drainage
Design specification for steel structures
Code for construction and acceptance of steel structure projects
GB/T13384
General technical conditions for packaging of electromechanical products
SYJ4007
ZBJ98003
Standards for surface treatment of steel before painting
Technical conditions for paint packaging of water treatment equipment
3 Models, specifications and basic parameters
3.1 Model compilation
Marking example:
Pool width, m
Sand scraping code S
Slag scraping code Z
Scraping machine code G
The plate-lifting scraper with a pool width of 6m is marked as: GZS-6 plate-lifting scraper 3.2 Technical parameters
Technical parameters are shown in Table 1.
3.3 Scraper type structure outline diagram
The scraper type structure consists of a frame, an electric control box, a walking mechanism, a scraping mechanism, a sand scraping mechanism, an electric control system, a limit device and other components. Its appearance is shown in the schematic diagram (Figure 1).
Approved by the Ministry of Machinery Industry on July 18, 1994
Implemented on July 1, 1995
Parameters Pool width
GZS-3,5
GZS-10
GZS-12
Scraper length
(150~400)
JB/T 7257r94wwW.bzxz.Net
Traveling speed
Lifting time
Climbing time
15～30
Note: Specifications above 7m are suitable for two tanks with one walking mechanism (double tanks with two plates or single tank with two plates belong to the deep-growing series》This is the size of the two-platen angle, determined by the process resources
-Traveling speed mechanism: 2-frame+3-scraping mud mechanism: 4-electric control box: 5-scraping slag mechanism Figure 1
Motor power
Reducing machine
Overview According to the traveling
traveling
, lifting speed
, different models and
speed ratios are determined
4 Technical requirements
4.1 Sedimentation tank
4.1.1 The design of sedimentation tank shall meet the requirements of GBJ14. JB/T7257-94
4.1.2 The sand (mud) content of the influent is less than 5000mg/L, and the sedimentation retention time is 1~2h. 4.1.3 The particle size of the influent sand is less than 1mm, and the maximum particle size of the slag is less than 10mm. 4.1.4 The moisture content of the sediment sand is 98%,
4.1.5 When the pool width is greater than 7m, the scraper should be designed as a double plate, and the plates and the plates and the pool wall should be designed to be sloped to avoid dead corners on both sides. 4.1.6 The pool bottom is designed to be flat.
4. 2 Motors and electronic control equipment
4.2.1 The motor shall be a three-phase asynchronous motor with electromagnetic brake - type YEJ. If explosion-proof is required, type YB shall be used. The motor shall comply with the provisions of GB755.
4.2.2 The electronic control equipment shall be equipped with a main circuit switch, operating buttons, and protective electrical appliances and signal devices for overcurrent, overload, and undervoltage. When the control is in progress, an emergency stop button must be added next to the machine. 4.2.3 The electronic control equipment shall comply with the provisions of GB4720. The electronic control equipment shall be box-type with protection level IP55. 4.3 End beams and steel structure trusses
4.3.1 The steel structure design specification shall refer to GBJ.17. 4.3.2. Steel structure welded parts Manufacturing, assembly, welding, installation and acceptance shall all comply with the provisions of GBJ205. 4.3.3 The maximum span of the steel beam shall not exceed 1/1000 of the span L, and the manufacturing error of the steel beam shall comply with the provisions of Tables 3.9.1 to 4 in GBJ205.
4.3.4 The welds of each part of the welded parts shall be flat and smooth, and shall not have any cracks, pores, slag inclusions, false welds and other defects. 4.4 Travel transmission mechanism
4.4.1 The size tolerance of this mechanism shall refer to GB10183. 4.4.2 The material of the wheel, gear and coupling is 2G270-500, which shall comply with the provisions of GB11352. The surface rate of the wheel rim is fire and the hardness is 350HB.
4.4.3 The transmission main shaft needs to be tempered and the hardness is 207 to 241HB. 4.4.4 The wheels should rotate flexibly without blocking or looseness. The wheels should be in contact with the track surface and should not be suspended. 4.4.5 The parallelism tolerance of the wheels: the diagonal angle is not more than 6mm: the same side is not more than 3mm, and the flatness tolerance is not more than 5mm. 4.4.6 The wheel track deviation is not more than ±5mm. 4.4.7 The wheel wheelbase deviation is not more than ±2mm. 4.5 Track (steel rail or terrazzo track surface)
4.5.1 The track track gauge deviation is not more than ±5mm. 4.5.2 The horizontality tolerance of the track top surface is not more than 5mm, the flatness tolerance is not more than 5mm, and the track straightness tolerance is not more than (1/1500) the pool width.
4.5.3 The gap between track joints is 23mm in summer and 5~6mm in winter (below 0℃). 4.5.4 The height difference of the track joint is not more than 0.5mm, and the end face misalignment is not more than 1.0mm. 4.5.5 The joints of two parallel guide rails must be staggered, and the staggered distance should be greater than the wheelbase. 4.5.6 Both ends of the guide rails should be installed with firm limit devices, and their height should be equal to 2/3 of the wheel diameter. 4.5.7 The horizontality tolerance of the terrazzo track surface for trolley travel shall not exceed 10mm. 4.5.8 The distance deviation between the contact surfaces of the two guide wheels is ±10mm. 4.6 Scraping (mud) mechanism
4.6.1 The lifting transmission mechanism of the scraping (mud) plate must meet the requirements of the drawings, ensure its size, shape and position tolerance, material and heat treatment requirements, ensure its flexible operation after assembly, without jamming or loosening, and ensure that its push rod can freely extend and retract in the cylinder. 3
JB/T 725794
4.6.2 The swing shaft seat hole must be concentric and parallel to the left and right support frame pins, left and right digging rod pins, and support shaft seats. 4.6.3 When assembling the rocker and the sand (mud) scraper frame, it is necessary to ensure that the pins are concentric, the pins are parallel to the mud scraper without distortion, and the parallelism tolerance is not greater than 5mm.
4.6.4 After the sand (mud) scraper mechanism is assembled, the lifting and lowering plate tests are carried out, and its horizontality and parallelism are checked. The horizontality is checked at both ends of the scraper, and the horizontality tolerance is not greater than 10mm.
4.6.5 After the horizontality is corrected, adjust the upper and lower limit switch contacts to make them accurately contact and release, and check the operating conditions of the electric control components in the electric control box. 4.7 Scraping mechanism
4.7.1 The scraping roll must be processed with tolerance to ensure close fit with the reducer shaft, and the center of the roll and the center of the guide wheel must be on the same straight line.
4.7.2 The pin holes of the left and right brackets must be drilled after welding. When installing, it is necessary to ensure that the four bracket pin holes are concentric and parallel to the truss bottom beam, and the parallelism tolerance is not greater than 3mm.
4.7.3 When assembling the left and right scraping frames, it is necessary to ensure that the four pin holes are concentric and parallel to the scraping plate, and the parallelism tolerance is not greater than 3mm. 4.7.4 After the scraping mechanism is assembled, the lifting and lowering plate test is carried out, and the horizontal tolerance of the scraper is not greater than 10mm. 4.7.5 After the horizontality of the scraper plate is corrected, adjust the upper and lower limit switch contacts to make it difficult to accurately touch and release, and check the operating conditions of the electric control box and electric control components.
4.8 Painting
4:8.1 Before painting, burrs, scale, rust, blisters and oil stains must be removed to keep the surface smooth. The surface treatment of steel materials should meet the requirements of SYJ4007.
4.8.2. When painting, there shall be no appearance defects such as blistering, peeling, wrinkling and sagging. 4.8.3 The paint for the above-water part of the equipment shall be of good performance such as moisture-proof, heat-resistant, color-retaining and atmospheric-resistant. The paint for the underwater part shall be of good performance such as water-resistant, anti-corrosive and wear-resistant. Its quality shall meet the requirements of ZBJ98003. 4.8.4 The thickness of the paint film shall meet the following requirements: 150~200μm above water, 200~300um underwater. 4.9 This machine can be used for outdoor operation, suitable for ambient temperature of -16~40C. When the ambient temperature is 40C, its relative humidity shall not exceed 50%.
.5 Test methods and inspection rules
5.1 Assembly inspection
5.1.1 The walking mechanism shall be inspected according to 4.4.5~4.4.7, and 5.1.2 The scraping sand (mud) mechanism shall be inspected according to 4.6.1~4.6.4. 5.1.3 The scraper mechanism shall be inspected according to 4.7.1 and 4.7.4. 5.1.4 There are 15 items of factory tests and inspections for products, see Table 2. 5.1.5 Judgment rules
5.1.5.1 Check according to 5.1.1~5.1.3. Products that meet the technical requirements in Table 2 shall be judged as qualified products. 5.1.5.2 Adjustments and corrections are allowed for unqualified products, and those that still fail to meet the requirements shall be judged as unqualified. Table 2 Product factory test and inspection table
Product name Specification:
Inspection items
Welding frame geometric dimension tolerance
Channel external defects (burn-through, load pattern,
Unfull
Screw external defects (height. Width
Benzene, biting, external air holes
Inspection methods and measuring tools
Level or wire ruler
Groove checker
Technical requirements
According to GBJ205 requirements
Not allowed||According to JB/ZQ40003
Measured results
Inspection items
Wheel track deviation
Wheel wheelbase deviation
Parallelism tolerance of wheels on the same side
Parallelism tolerance of four wheels (diagonal)
Flatness tolerance of four wheels
Scraping plate and pin hole, frame flatness
Line tolerance
Scraping plate and pin hole, frame flatness
Line tolerance
Seals of strong wire pinwheel reducer
Lubricating oil overflow of lifting wire pinwheel reducer
Lifting transmission mechanism
Appearance inspection of coating
Slowness
Inspection date:
5.2 Running test
JB/T 725794
Continued Table 2
Testing methods and measuring tools
Steel ruler with spring scale
Steel ruler with spring scale
Steel wire ruler
Steel ruler with spring scale
Level or overlapping diagonal
Steel wire, steel ruler with spring scale
Steel wire, copper ruler with spring scale
Filter operation for 2h
Filter operation for 2b|| tt||Operation observation
Method,
Technical requirements
No seepage pain
Allow 20~100℃
Flexible and no looseness
No blistering, puncture, wrinkle
Line, flow collision
Carbon thickness gauge
Main inspector:
150~200μm above water
200~300μm under water| |tt||Inspection person in charge:
5.2.1 Before or after the installation of the motor and reducer, the single machine shall be tested for operation. 5.2.2 Before the whole machine is tested for operation, the installation track shall be checked according to 4.5.1~4.5.6. Actual measurement record
Inspection conclusion:
5.2.3. After the electrical control cabinet is installed, the wiring shall be carried out according to the electrical wiring diagram: and the power shall be turned on to check the execution of the action of each electrical component and whether the forward and reverse rotation of the motor meets the design requirements.
5.2.4 Debugging of the sand (mud) scraping mechanism: Check and adjust according to 4.6.5, and make five up and down movements after adjustment. And record the landing position of the five movements, and the error value shall not be greater than 10mm. 5.2.5 Debugging of the slag scraping mechanism, check and adjust according to 4.7.5, and make five up and down movements after adjustment, and record the landing position of the five movements, and the error value shall not be greater than 10mm.
5.2.6 Debugging of the traveling mechanism: drive the trolley to the terminal, adjust the travel switch to ensure that the scraper plate enters the sand (mud) collecting tank, then drive the trolley to the starting point, adjust the travel switch to make the scraper plate enter the slag collecting tank. 5.2.7. Program control test: after the inspection and debugging of each part, set the selection switch to the automatic operation gear, start the scraper (mud) machine three times, check the operation of each part, and check and record the traveling speed in the middle of one operation, stop the machine, and do a jog test. Check and record the scraper lifting and delay time at the starting and terminal to see if they meet the design requirements. 5.2.8 Shear surface: Tests in 5.2.2~5.2.7 can be performed in a micro-simulation test at the manufacturing plant according to user requirements, or in actual operation tests can be performed at the installation site.
5.2.9 Product on-site installation test and inspection, a total of 15 items, see Table 3. 5
Product name and specification:
Inspection items
JB/T7257-94
Table 3 Product on-site installation test and inspection table
Inspection methods and measuring tools
Track inspection (track gauge flatness, number of joints, height difference)
Motor and electronic control equipment inspection
Inspection of each connection bolt and transmission bolt
Auxiliary sand mechanism and its limit switch debugging
Scraping Debugging of the travel mechanism and its limit switch
Debugging of the travel mechanism and its limit switch
Program control test
Traveling speed
Lifting time of the slag plate
Lifting time of the scraper plate
Program control delay time
Water injection load test
Operation noise and drop
Maximum offset of the wheel and track during operation
Between the bottom of the scraper plate and the bottom of the foam
Inspection date:
5.2.10 Judgment rules
Horizontal only , spring release, relax
electrical instrument
wrench, steel wire, ruler
wrench, steel, saw ruler
reporter, steel wire, pot ruler
operation observation
stopwatch, ruler
stopwatch, steel ruler
operation observation
touch and hearing
measure the first, middle and final increase
respectively at the bottom of the pool
main inspector,
technical requirements
according to Article 4.5 of this standard
according to this Standard 4.2 years
According to 4.6.5 and
According to 4.7.5 and
According to 5.2.6 of this standard
According to 5.2.7 of this standard
According to the specified values of the product technical performance specifications
Verify whether 4~11. items exist
100mm±10mm
Inspection person in charge:
5.2.10.1 Check according to 5.2.2~5.2.9. Those that meet the technical requirements of Table 3 are judged as qualified products. Actual measurement results
Inspection conclusion:
5.2.10.2 For unqualified products, adjustment and correction according to 5.2.2~5.2.9 are allowed. Those that still fail to meet the requirements are judged as unqualified. 5.3 Type test
5.3.1 Before the trial production of a product is put into mass production, or when the product is modified or the process is significantly changed, a comprehensive assessment of the product quality should be conducted, that is, all technical requirements specified in the standard should be inspected. 5.3.2 The product on-site test shall have an idling time of no less than 2 hours and a load run time of no less than 24 hours. 5.3.3 For load operation measurement, electrical measuring instruments and tachometers can be used according to the actual situation of the factory, and force measuring instruments can also be used to measure power, speed, transmission torque, running resistance and other items, and make identification records. While measuring the load, check the running stability (vibration) and noise of each part, the leakage of each seal, and the temperature rise of the lubricating oil. 5.3.4
There are 6 items for on-site negative test and inspection of products, see Table 4. 5.3.5
5.3.6 Judgment rules
Perform the operation load test according to the items of 5.3.2 to 5.3.5. When the measured negative pressure value is between 105% and 40% of the specified value, it is judged as a qualified product and batch production is allowed. 5.4 Factory inspection
5.4.1 Products must have product inspection records before leaving the factory, and the product quality inspection certificate must be issued before leaving the factory 5.4.2 The ordering unit has the right to participate in the manufacturer's product inspection and supervision, and has the right to conduct random inspections according to this standard. Those that fail to meet the standards need to be reworked.
Product Name Specifications.
JB/T7257-94
Table 4 Product on-site load test and inspection table
Inspection methods and measuring tools
Continuous operation for 72h after commissioning or trial production
Travel motor reducer
Scrape and lift motor reducer
BLYsJ type
Input shaft power
Output shaft torque
Output shaft speed
Input power
Carry out the following load measurements while observing
Electrical measuring meter or dynamometer
Electrical measuring meter or dynamometer
Tachometer and force instrument
Electrical measuring meter or dynamometer
Electrical measuring instrument or dynamometer
Output shaft torque||tt| |Output shaft speed
Input shaft power
Liquid scraping and lifting motor reduction
BWYaJ type
Maximum resistance of scraping operation
Operation noise
Inspection date:
6 mark
Output auxiliary torque
Output shaft speed
Tachometer or dynamometer
Electrical measuring meter or dynamometer
Electrical measuring instrument or dynamometer
Tachometer or dynamometer
Dynamometer
Method specified in GB3768
Precision sound level meter
Main inspector:
Technical requirements
Normal operation
Determine the sealing value according to the product technical performance requirements Lw≤8G dB(A)
Inspection person in charge:
Conclusion of actual measurement results
Inspection summary:
Products need to be labeled in obvious places, and the content should include product name, model and specifications, manufacturer name, factory date, motor function, product number, etc.
, packaging, transportation, storage
7.1 After the product passes the inspection, the surface dirt and residual water marks should be removed. 7.2 All transmission parts that are not suitable for painting must be coated with anti-rust grease, wrapped and protected, and must be protected with linoleum when packing. 7.3 Product packaging shall be carried out in accordance with GB/T13384. The motor reducer must be fixed with bolts. All parts installed on the walking mechanism frame that are prone to collision must be wrapped and protected or removed and packaged separately. The box must be solid to ensure the safety of lifting. 7.4 The factory products should be accompanied by product certificates, product instructions, packing lists and product installation drawings. 7.4.1
The product certificate shall include the following contents:
Manufacturer name, date of manufacture, factory number: Product name, model and specifications:
Inspection results and inspection date;
Inspector number and signature of the person in charge of inspection. The product instruction manual shall include the following contents: Manufacturer name, address, product name, model and specifications (front and back cover): Purpose and main performance specifications:
Working principle and structural description;
Installation drawing marked with main external dimensions and connection dimensions: Main parts and materials:
Maintenance, care, installation and use precautions: Possible failures and their elimination methods:
List of accessories and wearing parts.
The product packing list shall include the following contents:
Ordering unit and contract number;
Manufacturer name and date of manufacture:
Product name, model and specification:
Product and accessories quantity and net weight:
Name and number of attached documents.
JB/T7257-94
The product packing list shall be stamped and dated by the packing inspector of the manufacturer. 7.5 Storage
The products shall be placed in a ventilated warehouse and placed neatly. They shall not be allowed to be stored in the open air or placed upright to prevent deformation and damage. 7.6 Warranty period
Within one year of being put into use, or no more than 18 months after delivery, the manufacturer shall be responsible for the warranty and replacement of the damaged parts of its products in normal use.
Additional remarks:
This standard is proposed and managed by the Environmental Protection Technology Research Institute of the Machinery Industry of the Ministry of Machinery Industry. This standard was drafted by Wuhan Valve Factory. The main drafters of this standard are Wan Baoqing and Ke Chunfang.
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