JB/T 4335-1991 Technical requirements for spiral discharge sedimentation centrifuge
Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T4335-1991
Screw Discharge Sedimentation Centrifuge
Technical Conditions
Published on July 22, 1991
Ministry of Machinery and Electronics Industry of the People's Republic of China Mechanical Industry Standard of the People's Republic of China
Implementation on July 1, 1992
Mechanical Industry Standard of the People's Republic of China
Screw Discharge Sedimentation Centrifuge
Technical Conditions
1 Subject Content and Scope of Application
This standard specifies the technical requirements, test methods and inspection rules for screw discharge sedimentation centrifuges. JB/T4335-1991
Replaces JB4335-86
This standard applies to LW horizontal screw discharge sedimentation centrifuges (hereinafter referred to as centrifuges) specified in JB/T502. 2 Reference standards
GB11352
GB1223
GB2100
GB2649
GB2650
GB2651
GB2653
GB3077
GB3280
GB4228
GB4 237
GB9439
GB10901
GB7284
ZB J77 002
JB/T502
JB2759
3 Technical requirements
General requirements
Packaging, storage and transportation pictorial symbols
High-quality carbon structural steel
Casting carbon steel parts for general engineering
Test method for intergranular corrosion tendency of stainless acid-resistant steel Technical conditions for stainless acid-resistant steel castings
Mechanical property test and sampling method for welded joints Impact test method for welded joints
Tensile test method for welded joints
Bending and flattening test method for welded joints
Technical conditions for alloy structural steel
Cold rolled stainless steel plate
Stainless steel blanks for forgings
Hot rolled stainless steel plate
Grey cast iron parts
Performance test methods for centrifuges
Frame wooden boxes
Technical specifications for conventional non-destructive testing of forged welded parts for centrifuges and separatorsTypes and basic parameters of spiral unloading sedimentation centrifugesProduct labels
Technical conditions
Pressure vessel forgings
Packaging for electromechanical products
General technical conditions
Centrifuges shall comply with the provisions of this standard and be manufactured in accordance with the drawings and technical documents approved through the prescribed procedures. Product performance
Approved by the Ministry of Machinery and Electronics Industry on July 22, 1991 JB/T4335-1991
Implemented on July 1, 1992
JB/T4335-1991
3.2.1 The basic parameters of the centrifuge shall comply with the provisions of JB/T502. 3.2.2 The speed of the drum shall not be less than 97% of the rated speed. 3.2.3 The vibration intensity of the centrifuge: 7.1 for idling and 11.2 for loaded operation. The noise (sound pressure level) shall not exceed 90dB (A) when the centrifuge is idling and loaded. 3.2.4
3.2.5 When the centrifuge is idling, the temperature of the main bearing shall not exceed 70℃, and the temperature rise shall not exceed 35℃; when it is loaded, the temperature of the main bearing shall not exceed 75℃, and the temperature rise shall not exceed 40℃. 3.2.6 When the centrifuge is running empty or loaded, the differential oil temperature should not exceed 70℃, and the temperature rise should not exceed 40℃. 3. 2.7
The running current and temperature rise of the motor should not exceed their rated values. The production capacity and separation effect of the centrifuge should meet the design requirements. Under normal use, the average trouble-free working time of the centrifuge, minus the time for replacing wearing parts, should not be less than 3000h. 3.3 Structural design
There should be a processing plane on the centrifuge base for checking the installation level of the machine. 3.3. 2
The centrifuge should be suitable for overall lifting.
All exposed moving parts of the centrifuge should be covered with protective covers. The centrifuge should have safety protection devices, and the differential should be equipped with overload protection devices. The electric control and automatic control equipment of the centrifuge should meet the requirements of the use environment and have safety protection measures. There should be no leakage in the sealing parts of the centrifuge.
3.4Material of main parts
Iron castings shall comply with the provisions of GB9439.
Steel castings shall comply with the provisions of GB11352 or GB2100. 3.4.3Shaft parts shall comply with the provisions of GB699 or GB3077. 3.4.4The drum body shall comply with the provisions of GB3280, GB4237, GB4228, GB699 and GB3077. 3.4.5The spiral body shall comply with the provisions of GB3280, GB4237, GB4228, GB2100, GB11352, GB699 and GB3077.
3.4.6The materials used in the centrifuge shall comply with the provisions of the current standards and have a certificate of inspection. 3.5 Manufacturing
3.5.1 Heat treatment and flaw detection of defective parts
3.5.1.1 Cast iron and carbon steel castings shall be heat treated to eliminate internal stress and improve metallographic structure. 3.5.1.2 Austenitic stainless steel castings and forgings shall be solution treated. 3.5.1.3 Important welded parts such as drums and screw pushers shall be heat treated after welding to eliminate internal stress. Austenitic stainless steel drums and screw pushers shall be treated to prevent intergranular corrosion after welding. 3.5.1.4 Important forgings such as connecting plates shall be subjected to magnetic particle or ultrasonic flaw detection after heat treatment and shall comply with the provisions of ZBJ77002. 3.5.2 Welding of drums
3.5.2.1 Drum welding shall be performed by welders who have passed the examination of the labor department. 3.5.2.2 The repair of drum welds shall be approved by the technical department and the number of repairs shall generally not exceed two times. 3.5.2.3 The weld of each drum shall be inspected by radiographic flaw detection and meet the relevant provisions of ZBJ77002. 3.5.2.4 The mechanical properties of the welded specimens shall be determined in accordance with the methods specified in GB2649~GB2651 and GB2653. The mechanical properties of the weld shall not be lower than the requirements for the parent material.
3.5.3 Forging drum
JB/T4335-1991
3.5.3.1 The forging and acceptance of forgings shall meet the provisions of JB755. 3.5.3.2 Each drum forging shall be inspected by ultrasonic flaw detection and meet the relevant provisions of ZBJ77002. 3.5.3.3 Forging drums made of stainless steel shall be inspected by intergranular corrosion test. The test method shall be in accordance with the provisions of GB1223. Intergranular corrosion tendency is not allowed.
3.5.4 Dynamic balancing of parts
3.5.4.1 The drum, screw pusher and differential housing of each centrifuge shall be subjected to dynamic balancing test respectively, and the dynamic balancing accuracy shall not be lower than G6.3 level. The allowable residual unbalance shall be calculated according to the provisions of Appendix A (Supplement). 3.5.4.2 The maximum total correction weight of the dynamic balancing of the drum shall not be greater than 1/2000 of the total weight of the drum; the maximum total correction weight of the dynamic balancing of the screw propeller shall not be greater than 1/350 of the total weight of the screw propeller (double-headed) or 1/250 of the total weight of the screw propeller (single-headed). 3.6 Appearance quality
3.6.1 The surface of the stainless steel housing of the centrifuge shall be passivated or polished and embossed, and there shall be no obvious hammer marks and scratches. 3.6.2
The unprocessed surface of carbon steel and cast iron parts shall be painted, the paint boundary of the exposed surface of the machine shall be clear, and the paint film shall be even, flat, smooth and firm.
4 Test methods
4.1 All tests of the centrifuge shall be carried out in accordance with the methods specified in GB10901. 4.2 The centrifuge idle test site shall be equipped with a flat concrete platform or cast iron platform. The installation form of the machine (elastic or rigid foundation) shall be consistent with the installation form during use. 5 Inspection rules
5.1 Basic requirements
The centrifuge shall be inspected and accepted by the quality inspection department of the manufacturer. 5.2 Inspection classification
Product inspection of centrifuges is divided into factory inspection (idle running test) and type inspection (idle running test and load running test). Batch products shall be inspected one by one. Type inspection shall be carried out in any of the following situations: a. Trial and final product identification of new products or old products transferred to the factory for production: b. After formal production, if there are major changes in structure, materials, and processes that may affect product performance: C. During normal production, an inspection should be carried out periodically or after a certain amount of production has been accumulated; d. When the product is stopped for a long time and production is resumed; e. When there is a significant difference between the factory inspection result and the last type inspection; f. When the national quality supervision agency proposes a requirement for type inspection. 5.3 Test items
All types of inspections of centrifuges shall comply with the provisions of the following table: Test sequence
Operation stage
Test items
JB/T4335-1991
JB/T4335-1991
Appearance inspection
Start-up test
Operation test
Vibration test
Noise test
Water addition test
Operation test
Vibration test
Noise test
Separation performance test
Factory inspection
Note: △ indicates that the test should be carried out; O indicates that the test should be carried out as needed; - indicates that the test is not carried out. Test time
The idle operation test of the centrifuge is carried out at the rated speed, and the operation time should be no less than 4h. The load operation test of the centrifuge is carried out under the rated working conditions, and the operation time should be no less than 8h. 5.5 Idle running test
Document inspection before test
a.Material certificate of main parts and components:
b.Non-destructive testing report of drum and main shaft:c.Dynamic balancing test report of main rotating parts:d.Intergranular corrosion test report of main stainless steel rotating parts:e.Quality certificate of main purchased and supporting parts5.5.2 Appearance inspection
Inspect the appearance quality and protective devices of the centrifuge to meet the requirements of Articles 3.3.3, 3.3.4 and 3.6. 5.5.3 Start-up test
5.5.3.1When starting to rated speed, the centrifuge should have no friction and abnormal sound, which meets the design requirements. 5. 5. 3. 2
Type inspection
Measure the starting time and maximum starting current of the centrifuge when it starts to rated speed, which should meet the design requirements. Operation test
Measure the speed of the drum to meet the requirements of Article 3.2.2. 5. 5. 4. 1
5.5.4.2 Measure the temperature and temperature rise of the main bearing, which shall comply with the relevant provisions of Article 3.2.5. 5. 5. 4. 3
Measure the temperature and temperature rise of the differential oil, which shall comply with the provisions of Article 3.2.6. 5.5.4.4
Measure the running current and temperature rise of the motor, which shall comply with the provisions of Article 3.2.7. 5.5.5 Vibration test
Measure the vibration intensity of the centrifuge, which shall comply with the relevant provisions of Article 3.2.3. 5.5.6 Noise test
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Measure the noise of the centrifuge, which shall comply with the provisions of Article 3.2.4. 5.5.7 Water Addition Test
Add water to the centrifuge drum, run for 30 minutes, check the sealing performance, and comply with the provisions of Article 3.3.6. 5.6 Load Operation Test
5.6.1 Operation Test
5.6.1.1 Measure the rotation speed of the drum, and comply with the provisions of Article 3.2.2. 5.6.1.2 Measure the temperature and temperature rise of the main bearing, and comply with the relevant provisions of Article 3.2.5. 5.6.1.3 Measure the temperature and temperature rise of the differential oil, and comply with the provisions of Article 3.2.6. 5.6.1.4 Measure the running current and temperature rise of the motor, and comply with the provisions of Article 3.2.7. 5.6.2 Vibration Test
Measure the vibration intensity of the centrifuge, and comply with the relevant provisions of Article 3.2.3. 5.6.3 Noise Test
Measure the noise of the centrifuge, and comply with the provisions of Article 3.2.4. 5.6.4 Separation performance test
The production capacity and separation effect of the centrifuge under rated working conditions shall meet the design requirements. Quality assurance period
If the user complies with the storage, installation and operation conditions specified in the product manual, within one year from the date of shipment from the manufacturer, if the centrifuge is damaged or fails to work normally due to poor manufacturing quality, the manufacturer shall be responsible for free repair or replacement (excluding wearing parts). 7 Marking, packaging, transportation and storage
7.1 A product label shall be installed in a conspicuous position of the centrifuge, and its size and technical requirements shall comply with the provisions of JB8, including: a. Model and name of the centrifuge;
b. Main technical parameters:
Nominal diameter of drum (large end), mm:
Drum speed, r/min:
Spiral differential speed, r/min;
Separation factor;
Main motor power, kW:
Weight of centrifuge, kg:
Overall dimensions, mm;
c.Manufacture date and number:
d.Manufacturer name.
7.2 The centrifuge should have a sign indicating the direction of rotation of the motor or drum. 7.3 The packaging mark of the centrifuge should comply with the provisions of GB191. 7.4 The packaging of the centrifuge should comply with the provisions of GB7284 and JB2759. 7.5 The surfaces of the accessories, spare parts, tools and main machine of the centrifuge that may be corroded by the atmosphere should be treated with rust prevention. 7.6 The centrifuge must be accompanied by the following documents when it leaves the factory, and spare parts, spare parts and special tools should be provided with it. 5
JB/T4335-1991
a. Packing list;
b. Product quality certificate;
c. Product instruction manual:
JB/T4335-1991
d. Installation drawing (when there is no installation drawing in the product manual); e. List of random equipment and accessories.
7.7 The centrifuge should be stored in a sheltered place with a relative humidity of less than 80%, a temperature below 40°C and no corrosive media. 6
JB/T4335-1991
JB/T4335-1991
Appendix A
Allowable residual unbalance of centrifuge parts and components dynamic balancing (supplement)
The allowable residual unbalance of centrifuge parts and components balancing is calculated according to formula (A1): M=
-allowable residual unbalance, gcm;
Where: M
G—part (or component) weight, kg;
Allowable eccentricity of the center of gravity of the part (or component), μm. The allowable eccentricity of the center of gravity is calculated according to formula (A2): e
Where: A
Dynamic balancing accuracy, take 6.3mm/s
Part (or component) rotation angular velocity, I/s1000A
The M value calculated by formula (A1) is zero, the total allowable residual unbalance at the center of gravity of the component, and the allowable residual unbalance on the two correction planes (see Figure A1) is calculated according to formula (A3) and formula (A4): M,=M
Where: M,
|Allowable residual unbalance on correction plane 1 (see Figure A1), 9cm:
Allowable residual unbalance on correction plane II (see Figure A1), gJB/T4335-1991
JB/T43351991
M=allowable residual unbalance of zero and component, 9cm:
a=distance from zero and component's centre of gravity to correction plane I, mm; b=distance from zero and component's centre of gravity to correction plane III, mm. Note: The correction planes " and " should be selected as two planes that do not affect the strength and working performance of the balancing parts and are as far away from each other as possible. Additional notes:
This standard is proposed and managed by the National Technical Committee for Separation Machinery Standardization. This standard is drafted by Sichuan Jiangbei Machinery Factory. The main drafters of this standard are Zheng Wanjiang, Zhang Jianming and Xiao Shangying. Technical Conditions" is invalid.
From the date of implementation of this standard, the original JB4335-86 "Horizontal Screw Discharge Sedimentation Centrifuge People's Republic of China
Mechanical Industry Standard
Screw Discharge Sedimentation Centrifuge
Technical Conditions
JB/T4335-1991
Published and issued by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute Print
(No. 2, Shouti South Road, Beijing
Format 880×1230
First edition in December 1991
Print run 1—500
Postal code 100044)
Sheet 3/4bzxZ.net
Word count 16,000
First printing in December 1991
Price 5.00 yuan
Mechanical Industry Standard Service Network:
National Standard of the People's Republic of China
http:/www.JB.ac.cn
Marking example:
National Standard of the People's Republic of China
Die-casting mold parts
B-type guide sleeve
Die-cast die components
Guide bushings type B
L=26 type B guide bushing:
GB4678.7—84
16×26
1Material
GB1298—77
2Heat treatment
HRC50~55
3Technical requirements
According to the provisions of GB4679—84
Additional instructions:
Same as GB4678.1-84
Published by National Bureau of Standards on September 27, 1984
Other 5
UDC621.725.22
GB4678.7-—84
Implemented on August 1, 1985
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