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GB/T 38601-2020: Power extraction coupling - General technical requirements
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Power extraction coupling - General technical requirements
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GB/T 38601-2020
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Basic data | Standard ID | GB/T 38601-2020 (GB/T38601-2020) | | Description (Translated English) | Power extraction coupling - General technical requirements | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J19 | | Classification of International Standard | 21.120.20 | | Word Count Estimation | 10,115 | | Date of Issue | 2020-03-31 | | Date of Implementation | 2020-10-01 | | Quoted Standard | GB/T 1031; GB/T 1184; GB/T 1800.2; GB/T 3931; GB/T 9239.1; GB/T 12458; JB/T 7511; JB/T 8556; JB/T 8557; ISO 4863 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | | Summary | This standard specifies the terms and definitions, design, manufacture and inspection, testing, marking, packaging and storage of power extraction couplings (hereinafter referred to as couplings). This standard applies to power extraction couplings, and other couplings can also be implemented by reference. | GB/T 38601-2020: Power extraction coupling - General technical requirements---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Power extraction coupling - General technical requirements
ICS 21.120.20
J19
National Standards of People's Republic of China
General technical requirements for power extraction couplings
2020-03-31 released
2020-10-01 implementation
State Administration for Market Regulation
Issued by the National Standardization Management Committee
General technical requirements for power extraction couplings
1 Scope
This standard specifies the terms and definitions, design, manufacturing and inspection, testing, marking, packaging and storage of power extraction couplings (hereinafter referred to as couplings).
This standard applies to power extraction couplings, other couplings can also be implemented by reference.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document.
For undated references, the latest version (including all amendments) applies to this document.
GB/T 1031 Product Geometric Technical Specification (GPS) Surface Texture Profile Method Surface Roughness Parameters and Values
GB/T 1184 shape and position tolerance without tolerance value
GB/T 1800.2 Geometric Technical Specifications for Products (GPS) Limits and Fits Part 2.Standard Tolerance Classes and Table of Limit Deviations of Holes and Shafts
GB/T 3931 Coupling Terms
GB/T 9239.1 Mechanical vibration constant (rigid) rotor balance quality requirements Part 1.Specification and balance allowable inspection
GB/T 12458 Coupling Classification
JB/T 7511 Mechanical Coupling Selection Calculation
JB/T 8556 Selection of technical data of coupling
JB/T 8557 flexible coupling balance classification
Data provided by users and manufacturers of ISO 4863 flexible couplings
3 Terms and definitions
The following terms and definitions defined in GB/T 3931 apply to this document.
3.1
Power extraction coupling
When the power system or power transmission system has an additional transmission function, the additional transmission device drives the mechanical output shaft (or rotating part) and the driven mechanical input shaft
(Or rotating parts) couplings with specific functions.
4 Design of coupling
4.1 Functions of the coupling
4.1.1 Effectively realize the connection of the two axes to transmit torque and movement. And more accurately ensure the corresponding cushioning and damping performance, and meet the working speed,
Working environment, service life requirements, etc.
4.1.2 It has the corresponding accurate radial compensation capability.
4.1.3 It has corresponding accurate axial compensation capability.
4.1.4 It has the corresponding accurate angular compensation capability.
4.1.5 Have correspondingly accurate torsional stiffness.
4.1.6 Have correspondingly accurate relative damping.
4.1.7 Have correspondingly accurate axial, radial and angular stiffness.
4.2 Technical performance and selection of coupling
4.2.1 The data items provided by the user and the manufacturer to the flexible coupling shall be in accordance with ISO 4863.
4.2.2 The technical data items of the coupling are selected according to the regulations of JB/T 8556.
4.2.3 The selection and calculation of the coupling shall be carried out in accordance with the regulations of JB/T 7511.
4.2.4 The technical performance and design selection technical data of couplings for special industries and special equipment can be specified according to specific conditions.
4.3 Design calculation of coupling
4.3.1 Technical performance index items for coupling design
4.3.1.1 When designing the coupling, the relevant load value and vibration change value, as well as the speed, stiffness, and
For index values such as compensation amount and temperature, the main performance index items are shown in Table 1.In special circumstances, specific indicators need to be added.
4.3.1.3 When designing the coupling, consider the safety factor and working condition factor according to the equipment requirements and site conditions.
4.3.2 Type and size of coupling
4.3.2.1 The type, variety and structure of the coupling should be reasonably selected according to the requirements of the driving machinery and the driven machinery as well as the working environment.
The configuration ensures various technical performance requirements. The type of typical coupling is selected according to GB/T 12458, and its structure can be specially designed when there are special requirements.
4.3.2.2 The relevant dimensions and tolerances of the coupling shall be determined according to the connection requirements and installation space of the driving machine and the driven machine. You can press
According to the relevant standard coupling size and tolerance of the selected type, the size and tolerance can also be determined according to the special design type.
4.3.3 Torque and speed of the coupling
4.3.3.1 The basic principle of coupling torque calculation is. the calculated torque Tc is less than or equal to the failure of the weakest link of the coupling (strength, change)
The torque that is allowed to be transmitted for a long time due to the conditional restrictions of the shape, slippage, wear and temperature rise, etc., is as shown in equation (1).
4.3.3.2 The calculated torque Tc under long-term stable load is calculated according to formula (2).
The calculation of torque Tc can be calculated according to the power of the above-mentioned power machine, or according to a special professional method.
4.3.3.3 The maximum torque Tmax under impact load is calculated according to formula (3).
4.3.3.4 The maximum torque Tmaxc under long-term cyclic loading is calculated according to formula (4).
4.3.3.5 The speed of the coupling should not exceed the maximum operating speed restricted by conditions such as the material strength limit and the deformation of the connecting structure, that is, as shown in formula (5).
4.3.3.6 When the coupling may resonate due to factors such as length, mass and speed, its own critical speed nc should be checked.
The calculation of critical speed nc is calculated according to professional regulations.
The working speed n of the coupling should meet. n< 0.7nc or n>1.3nc
4.3.4 Dynamic balance of the coupling
4.3.4.1 When the coupling rotates at a high speed, the rotating parts will bear larger radial and tangential forces due to mass eccentricity, and related parts may produce
Excessive stress or deformation may also affect the normal operation of driving machinery and driven machinery. At this time, the coupling should be dynamically balanced.
4.3.4.2 The selection of coupling dynamic balance level is generally in accordance with GB/T 9239.1 or JB/T 8557.
4.3.5 Material and heat treatment of coupling
4.3.5.1 The materials (metal and non-metal) selected for the coupling parts shall generally meet the requirements of the corresponding national standards, industry standards and specifications.
Special parts can be made of special materials with mature technology.
4.3.5.2 When the type and size of the coupling are selected as standard couplings, the material of the parts generally meets the mechanical properties (physical properties) of the corresponding standards.
4.3.5.3 When the type and size of the coupling are specially designed, according to the requirements of the load, stiffness and compensation, the parts should be selected from reasonable materials.
Ensure that the coupling fully meets the reliability and life of normal operation.
4.3.5.4 When the coupling is working in a working environment such as high humidity, water, acid-base, salt spray, oil, corrosive medium, high and low temperature, etc., in addition to effective protection
In addition to corrosion measures, materials that are resistant to corrosion and high and low temperatures should be used.
4.3.5.5 The main metal parts of the coupling need to specify corresponding and reasonable heat treatment requirements, including. normalizing, quenching and tempering, carburizing, nitriding and quenching, etc.
Fully meet various strength, elasticity and wear resistance properties.
4.3.5.6 The material of the main non-metal parts of the coupling should specify the corresponding physical performance requirements, and fully meet the performance of strength, damping, wear, water resistance, oil resistance, high and low temperature resistance.
4.3.6 Accuracy of the coupling
4.3.6.1 Coupling parts shall specify the appropriate dimensional tolerances, geometric tolerances and roughness according to the use requirements and matching accuracy. Among them, the main
Surface to be machined. dimensional accuracy is not less than the 7 level specified in GB/T 1800.2; the shape and position tolerance is not less than the 8 level specified in GB/T 1184; fit
The surface roughness Ra value is not more than 1.6 specified in GB/T 1031, and the surface roughness Ra value of the end face of the contacted part is not more than 3.2.
4.3.6.2 The coupling shall determine its transmission accuracy according to the use requirements, including synchronization, hysteresis and periodicity. For those caused by angular displacement
The additional torque that may be caused by the periodic angular velocity is evaluated.
4.3.7 Other requirements for coupling design
4.3.7.1 The design of the coupling should have a calculation sheet, but it is not used as the information submitted to the user, and is only used for traceability for future reference.
4.3.7.2 Non-destructive flaw detection requirements shall be specified for key metal parts of the coupling.
4.3.7.3 The key non-metal parts of the coupling shall specify the requirements for impurities, bubbles, cracks and surface quality.
4.3.7.4 The coupling parts shall specify the corresponding effective surface anti-corrosion measures.
4.3.7.5 The type and material selection of standard parts in the coupling shall fully meet the requirements of strength, elasticity, wear resistance and corrosion protection.
4.3.7.6 When fasteners are used in key parts of the coupling, anti-loosening measures shall be required.
4.3.7.7 The interchangeability of parts shall be considered during the design of the coupling.
4.3.7.8 The coupling assembly drawing shall specify the relevant technical requirements during and after assembly.
4.3.7.9 The coupling lubrication method generally adopts sealed lubrication, and specifies the type and brand of lubricating grease.
4.3.7.10 The economy of component manufacturing should be considered during the design of the coupling.
4.3.7.11 After the coupling is designed, there should be an instruction manual, and the general coupling can be installed according to the general installation instruction; for special design, the installation instruction should be compiled separately.
5 Manufacturing and inspection of couplings
5.1 The coupling manufacturing and inspection department shall carry out manufacturing, inspection and acceptance according to the product drawings and design documents approved by the prescribed procedures, and shall be accompanied by a quality certificate.
5.2 The material, heat treatment and surface anti-corrosion treatment of the coupling parts shall be implemented strictly in accordance with the requirements of the product drawings and relevant standards.
5.3 Coupling parts should have a detailed manufacturing process to fully ensure that the finished parts are qualified.
5.4 The machining dimensional error, form and position error and surface roughness of the coupling parts should meet the tolerance and roughness requirements specified in the product drawings.
5.5 Unmarked tolerances, unmarked shape and position tolerances and unmarked roughness of the coupling parts shall be implemented in accordance with relevant industry and professional standards and specifications.
5.6 The standard parts and other purchased parts of the coupling should be checked and accepted in accordance with the requirements of the corresponding standards and specifications (or samples), and the supplier should provide qualification certification materials.
5.7 The coupling assembly should be carried out in strict accordance with the requirements of the assembly drawing and the relevant assembly technical requirements, and be coated with anti-rust oil and paint as required.
5.8 The inspection department shall carry out inspection and acceptance of all parts and assemblies and keep various inspection records. When sampling inspection and acceptance, it should be in accordance with the corresponding standards,
Design documents or random inspection methods agreed with users. When leaving the factory, a product quality certificate is issued.
6 Coupling test
6.1 Test conditions
6.1.1 The coupling test piece shall be inspected to pass before the test, according to some or all of the test items in Table 3.
6.1.2 Before the coupling test piece is tested, it should be ensured that the accuracy calibration of the relevant test instrument is qualified.
6.1.3 The coupling test shall specify the test temperature in accordance with the requirements for use.
6.2 Test classification
6.2.1 Type test
6.2.1.1 If the coupling has one of the following conditions, the type test shall be carried out.
a) New products before mass production;
b) After the product is officially put into production, if there are major changes in structure, materials, and processes, the performance of the product may be affected;
c) The product has been discontinued for more than one year and before production is resumed;
d) When the national quality supervision agency or other third-party product verification agency requests for type testing;
e) When requested by the user.
6.2.1.2 During the type test, no less than one set of products shall be selected for the test.
6.2.2 Factory test
6.2.2.1 All coupling products shall be tested before leaving the factory.
6.2.2.2 The factory test items of the coupling shall be determined according to the specific mechanical equipment and work requirements.
6.3 Test types and test items
6.3.1 Test type.
a) Idling test;
b) Static test;
c) Dynamic performance test;
d) Fatigue life test;
e) Overload test.
The test items of the test type are shown in Table 3.
6.3.3 For special needs, test types and test items can be added.
6.4 Test specifications
6.4.1 The coupling test does not include the coupling during the production process.
6.4.2 In the static and dynamic tests, the test shall be conducted according to the nominal (rated) torque; in the overload test, the test shall be conducted according to the torque exceeding the nominal (rated) torque by a certain percentage.
6.4.3 When a large batch of couplings (above 20 pieces) of the same specification needs to be tested, sampling tests can be used, and 5% of each batch is sampled, and when there are less than 20 pieces
At least one piece shall be selected for testing.
6.4.4 If the coupling has dynamic balance requirements, it is necessary to confirm that the attached dynamic balance test report meets the dynamic balance level index requirements before the test.
6.4.5 When the coupling is subjected to dynamic performance test or fatigue life test, a static test under 100% torque should be carried out first to ensure that its strength is sufficient and safe.
6.4.6 Except for the long-term fatigue life test, the other tests are all short-term tests. Under the conditions of applied torque or speed, the test time is determined according to specifications or user requirements.
6.4.7 After the coupling is subjected to static test, dynamic performance test, fatigue life test, and overload test, its welds need to be re-detected.
6.4.8 When all the coupling inspections meet the requirements, the coupling product is determined to be qualified. If there are items that do not meet the requirements, corrections are allowed
Re-inspection will be carried out after measures. If the re-inspection meets the requirements, it is still judged as qualified. If the re-inspection still does not meet the requirements, the product is judged as unqualified.
6.4.9 After the coupling test is completed, the test report is prepared and approved by the prescribed procedures. The test report is archived as permanent data.
6.5 Test report
6.5.1 The report includes the main content.
a) The name of the test unit;
b) The name and number of the test piece;
c) Test equipment related information, test methods, test environment and its purpose;
d) Description of relevant characteristics of the test piece and information on parameters, indicators, test types or test items;
e) The original record information and charts of the data information or phenomenon of the test results (including software screenshots, etc.);
f) Final analysis chart or conclusion information of test data;
g) The name of the tester and issuer (or approver).
6.5.2 When the national quality supervision department conducts product random inspection or certification, its test report shall be compiled according to the corresponding format and requirements.
7 Marking, packaging and storage
7.1 The coupling should be printed with the model mark on the specified or obvious position.
7.2 Coupling packaging should be carried out in accordance with the specified anti-rust method, packaging requirements and packaging box, and the packaging box should be sprayed and printed with the storage and transportation pictorial signs and the receipt and delivery signs according to the specified requirements.
7.3 The coupling should be stored in a dry place, away from the sun and rain, and avoid contact with acids, alkalis, organic solvents and other substances during the storage period.
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