JB/T 4328.8-1999 General technical requirements for assembly of electrical equipment
Some standard content:
JB/T4328.8-1999
This standard is a revision of JB4328.8-86 "General Technical Requirements for Assembly of Electrician Special Equipment". Appendix A of this standard is the appendix of the standard, and Appendix B is the appendix of the reminder. This standard replaces JB4328.8--86 from the date of implementation. This standard is proposed and coordinated by Shenyang Electrician Special Equipment Research Institute. This standard is drafted by Shenyang Electrician Special Equipment Research Institute. The main drafter of this standard: Chen Jiashan.
This standard was first issued on December 1, 1986, and this standard was revised for the first time. This standard is entrusted to Shenyang Electrician Special Equipment Research Institute for interpretation. 135
1 Scope
Machinery Industry Standard of the People's Republic of China
General Technical Requirements for Assembly of Electrician Special Equipment
Assemble machine general requirements for theelectrician special equipment This standard specifies the general technical requirements for assembly of electrician special equipment products. This standard applies to the assembly of electrician special equipment products. 2 Reference standards
JB/T4328.8-1999
Replaces JB4328.8—86
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When the standard is published, the versions shown are valid. All standards will be revised, and the parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T10095—1988 Precision of involute cylindrical gears (eqvISO1328:1975) GB/T113651989
JB/T4328.5—1999
JB/T4328.6—1999
JB/T7929—1995
JB/T9655-—1999
3 Requirements
3.1 General requirements
Precision of bevel gears and hypoid gears
General technical conditions for welding parts of special electrical equipment General technical conditions for machining of special electrical equipment Cleanliness of gear transmission devices
General technical conditions for control equipment
Special electrical equipment
3.1.1 All parts and components entering assembly must be qualified products. Purchased parts and outsourced parts must also have qualified certification documents. 3.1.2 The assembly of products must comply with the requirements of product assembly drawings, design documents, process documents, product standards and this standard. 3.1.3 The machined surfaces of parts and components entering assembly are not allowed to have rust, scratches, magnetic damage, burrs, oil stains, iron filings, etc. If there are slight scratches, repairs are allowed but the assembly accuracy and performance are not affected. 3.1.4 The non-machined surfaces of castings can only be assembled after the process of finishing a topcoat is completed and they are dry. 3.1.5 The working surfaces of the parts that cooperate with each other during assembly should be cleaned and coated with an appropriate amount of clean lubricating oil and grease. The oil holes and oil grooves of the parts should be unobstructed.
3.1.6 After assembly, each lubrication point must be filled with an appropriate amount of lubricating oil and grease. The gears and bearings should be filled with the specified grease in time. 3.1.7 Various felts and seals should be immersed in oil before assembly. After assembly, their dustproof and leakproof functions should be ensured, and no seepage or leakage should occur. 3.1.8 During the assembly process, parts and components that need to be machined shall comply with the provisions of JB/T4328.6. Parts and components that need to be welded shall comply with the provisions of JB4328.5.
3.1.9 Before assembling the oil tank, gear box, transmission and other boxes, sand, dirt and various debris and dust must be thoroughly cleaned. Approved by the State Bureau of Machinery Industry on August 6, 1999 136
2000-01-01 implementation
JB/T4328.8-1999
3.1.10 The contact between the cover of the oil tank, gear box, transmission and the box body should be good. In the free state, a 0.15mm feeler gauge should not be inserted. After tightening, a 0.05mm feeler gauge should not be inserted into one-third of the width of the joint surface. 3.1.11 The assembly environment should be free of strong noise and ensure sufficient light. For high-precision products, in addition to the above, attention should also be paid to dust-free and to the requirements of constant temperature and humidity.
3.2 Fastener assembly
3.2.1 When tightening screws, bolts and nuts, do not hit or twist them to ensure the appearance quality. 3.2.2 The end faces of the screw, bolt head and nut are in contact with the plane of the fastened parts, and their inclination and clearance should comply with the provisions of the technical documents.
3.2.3 For fasteners with tightening torque requirements, a torque wrench should be used. For bolts without specified tightening torque, the tightening torque shall be implemented in accordance with the provisions of Appendix B (Suggested Appendix).
3.2.4 When tightening multiple screws and bolts, they should be tightened symmetrically and in a cross-turn progressive manner. 3.2.5 After tightening, the head of the countersunk screw should be lower than the end face of the countersunk hole. 3.2.6 After the nut is tightened, the tongue of various stop washers should be bent immediately. The iron wire used to prevent the screw head from loosening should be installed and wrapped tightly according to the direction of the thread. 3.3 Assembly of rolling bearings
3.3.1 When installing the bearing, the end face with the marking should be placed in an easily visible position. 3.3.2 When installing the bearing, the bearing and the installation tools must be clean, and the installation environment must be free of dust pollution. 3.3.3 After the bearing is assembled, the inner ring must be in close contact with the shaft shoulder, and no gap is allowed. 3.3.4 The joint surfaces between the bearing end face, the gasket and the end cover must be parallel after assembly and tightening, and the pressure cover should be evenly attached to the gasket. 3.3.5 When assembling the bearing by the temperature difference method, the heating method for hot installation should be mineral oil heating, and its temperature should be 90~100℃. The cooling temperature should not be lower than -80℃ when cold installation.
3.3.6 After assembly, turn the shaft with the bearing by hand, it should run flexibly, and no blocking is allowed: for bearings lubricated with grease, the specified grease should be injected into no less than 1/2 of the cavity. 3.3.7 Under normal working conditions, the temperature rise of rolling bearings should not exceed 35°C, and the maximum operating temperature should not be higher than 60°C. 3.4 Assembly of sliding bearings
3.4.1 Split sliding bearings
3.4.1.1 Pairs of bearings should have clear matching marks. 3.4.1.2 The clearance, contact area and contact spots between the bearings and the journals should comply with the provisions of the product drawings and technical documents. If no provisions are made, the contact area should be within 30°~60° to the left and right of the midline, and the contact spots should comply with the provisions of Table 1. Table 1
Shaft speed r/min
Contact spot
25mm×25mm
>100-500
>500~1000
3.4.1.3When the bearing is fixed with a pin, the pin must fit tightly and must not be loose. The end of the pin must not exceed the end face of the bearing or bushing, and should generally be 1~2mm lower.
3.4.2Assembly of integral sliding bearings
3.4.2.1When press-fitting or cold-fitting fixed cylindrical sliding bearings, the inner diameter should be kept in accordance with the requirements of the product drawings. If necessary, it can be processed by precision reaming, scraping or extrusion, but it is not allowed to use emery cloth or chain knife for repair. 137
JB/T4328.8-1999
3.4.2.2 The cast alloy bushing and the bearing body shall be tightly combined, and no casting defects are allowed on the machined surface. 3.4.3 Under normal working conditions, the maximum operating temperature of the sliding bearing shall not be higher than 50℃. 3.5 Assembly of gears
3.5.1 The contact spots and side clearance of the gear pair teeth shall comply with the provisions of GB/T10095 and GB/T11365. 3.5.2 The misalignment of the width of the gear pair shall not exceed 2% of the tooth width. 3.5.3 The gear pair shall be able to rotate at a uniform speed, and no impact, bite or unexpected noise shall be allowed. Axially sliding gears shall slide easily and position accurately.
3.5.4 The cleanliness of the gear box shall comply with the provisions of JB/T7929. 3.5.5 When assembling planetary gears, each part shall rotate flexibly, and the others shall comply with the provisions of the drawings and technical documents. 3.6 Assembly of sprockets and chains
3.6.1 The fit between the sprocket and the shaft shall comply with the requirements of the product drawings. 3.6.2 After installation, the sprocket shall not have axial movement, the geometric center planes of the two linked sprockets shall coincide, and the offset e shall not be greater than 2/1000 of the center distance L between the two sprockets (see Figure 1). Figure 1
3.6.3 The meshing of the chain and sprocket shall be smooth, and the sag of the non-working edge shall not be greater than 3% of the center distance L. 3.7 Assembly of keys and splines
3.7.1 The two sides of the key and the keyway shall be in uniform contact, and the fit shall comply with the requirements of the drawings and technical documents. When the spline adopts a clearance fit, it shall slide freely without obstruction or uneven tightness. 3.7.22
3.7.3 After assembly, the exposed part of the hook key and wedge key shall generally be no larger than 5mm. 3.8 Assembly of couplings
The coaxiality and end face parallelism, radial displacement and angular displacement of the two connecting shafts shall comply with the provisions of Appendix A. 3.8.1
3.8.2The shaft end of the shaft matching the coupling shall be 1~2mm lower than the inner end face of the coupling. 3.8.3The clearance between the two opposite end faces of the coupling (except for universal couplings) shall be implemented in accordance with the standards of the respective couplings. 3.9 Assembly of brakes and clutches
3.9.1The brake band of the brake must be tightly attached and riveted, and the rivet head should be lower than the band plane by about one third to one half of the band thickness. The brake band is not allowed to crack.
3.9.2When the brake band is loosened, it must be evenly away from the brake wheel, and the clearance should be within 1~2mm. 3.9.3The dry friction plate clutch should be strictly prevented from entering with oil, water and other substances, and kept clean and dry. 3.9.4 After the dry friction plate clutch is tested, the friction area of its friction plate shall not be less than 75%, and its surface temperature shall not be higher than 150℃. 138
3B/T4328.8-1999
3.9.5 When the clutch is in the disengaged state, the active plate and the passive plate shall be completely separated. 3.9.6 When assembling a friction block clutch, its friction blocks shall be of equal height. When using its braking function, the action sequence of its clutch and brake shall be coordinated.
3.10 Assembly of hydraulic and pneumatic systems
3.10.1 Pipelines
Before assembly, the pipelines shall be derusted and cleaned. The pipelines shall be arranged neatly for easy maintenance.
The pipes shall not be flattened, dented, wrinkled or bent during production, and shall be naturally smooth. 3.10.2 Pipe joints
When assembling spherical pipe joints, the nuts should be tightened appropriately to reach the specified torque to prevent damage to the threads. 3.10.2.1
3.10.2.2When assembling ferrule pipe joints, the outer cone of the ferrule should be aligned with the inner cone of the joint body. When the pipe cannot be rotated, tighten the compression nut 1 to 1.3 turns.
When the pipe is a curved pipe, the length of the straight part leading from the joint should be greater than twice the length of the compression nut. 3.10.3 Seals and sealing
When using sealant, the oil, moisture, rust, etc. on the joint surface must be cleaned, and the leakproof test 3.10.3.1
and other tests should be carried out after the sealant is completely dry.
3.10.3.2When assembling sealants, check whether the sealants are damaged; the sealants must not be bitten during installation. During installation, lubricating oil should be applied to the surface of the lip seal ring and the main shaft. 3.10.3.3 When there are keyways, screw holes, or steps on the shaft end, a guide sleeve should be used to install the oil seal to prevent damage. 3.10.4 Assembly of pumps and valves
3.10.4.1 The pumps and valves should be cleaned before assembly. During assembly, the joint surfaces should be in close contact. The depth of penetration with a 0.02mm feeler gauge should not be greater than one-fifth of the width of the joint surface.
3.10.4.2 When connecting the pump and valve interface, attention should be paid to sealing. When necessary, sealing packing or sealant should be used. There should be no leakage. 3.10.4.3 The action of the pump and valve should be reliable, and the matching of the valve stem and the valve body should comply with the provisions of the product drawings. 3.10.4.4 When using purchased pumps and valves, their types and specifications should comply with the provisions of the technical documents of the drawings, and be accompanied by product qualification certification documents. Tests should be carried out before installation, and installation can only be carried out after they are correct. 3.11 Assembly of electrical system
The assembly of electrical system shall comply with the provisions of JB/T9655. 4 Test method
The inspection of products shall be carried out in accordance with the provisions of product standards and test outline. 5 Inspection rules
5.1 The sampling and inspection of products shall be carried out by the quality inspection department of the manufacturing unit in accordance with the provisions of product standards, technical documents and this standard. 5.2 The product must be accompanied by a quality certificate issued by the quality inspection department of the manufacturing unit before it leaves the factory. 6 Marking
6.1 When the product leaves the factory, it must be accompanied by a product certificate. .139
6.2 The product certificate shall include the following contents: a) Name of the manufacturing unit; t)
JB/T4328.8-1999
b) Product name, model (drawing code) and specifications: c) Product factory number and date of manufacture;
d) Signature of the inspector and the person in charge of the inspection department. 1) When the design and manufacturing are not done by the same unit, the name of the design unit should be indicated. 140
JB/T4328.8-1999
Appendix A
(Appendix to the standard)
The coaxiality, end face parallelism, radial displacement and angular displacement of the two connecting shafts of the coupling The coaxiality, end face parallelism, radial displacement and angular displacement of the two connecting shafts of the coupling shall comply with the provisions of Table A1. Table A1
Coupling
Oldham type
Elastic sleeve pin
Coupling rim diameter
100~300
>300-600
170~185
220-250
290~430
490-590
Coaxiality
End face parallelism
Radial displacement
Angular displacement
Aα degrees
See Table B1 for the tightening torque of ordinary bolts.
Strength grade
JB/T4328.8-1999
Appendix B
(Appendix of the standard)
Tightening torque of storage bolts
Tightening torque11 Assembly of electrical systemwwW.bzxz.Net
The assembly of electrical system shall comply with the provisions of JB/T9655. 4 Test method
The inspection of products shall be carried out in accordance with the provisions of product standards and test outline. 5 Inspection rules
5.1 The sampling and inspection of products shall be carried out by the quality inspection department of the manufacturing unit in accordance with the provisions of product standards, technical documents and this standard. 5.2 The product must be accompanied by a quality certificate issued by the quality inspection department of the manufacturing unit before it leaves the factory. 6 Marking
6.1 When the product leaves the factory, it must be accompanied by a product certificate. .139
6.2 The product certificate shall include the following contents: a) Name of the manufacturing unit; t)
JB/T4328.8-1999
b) Product name, model (drawing code) and specifications: c) Product factory number and date of manufacture;
d) Signature of the inspector and the person in charge of the inspection department. 1) When the design and manufacturing are not done by the same unit, the name of the design unit should be indicated. 140
JB/T4328.8-1999
Appendix A
(Appendix to the standard)
The coaxiality, end face parallelism, radial displacement and angular displacement of the two connecting shafts of the coupling The coaxiality, end face parallelism, radial displacement and angular displacement of the two connecting shafts of the coupling shall comply with the provisions of Table A1. Table A1
Coupling
Oldham type
Elastic sleeve pin
Coupling rim diameter
100~300
>300-600
170~185
220-250
290~430
490-590
Coaxiality
End face parallelism
Radial displacement
Angular displacement
Aα degrees
See Table B1 for the tightening torque of ordinary bolts.
Strength grade
JB/T4328.8-1999
Appendix B
(Appendix of the standard)
Tightening torque of storage bolts
Tightening torque11 Assembly of electrical system
The assembly of electrical system shall comply with the provisions of JB/T9655. 4 Test method
The inspection of products shall be carried out in accordance with the provisions of product standards and test outline. 5 Inspection rules
5.1 The sampling and inspection of products shall be carried out by the quality inspection department of the manufacturing unit in accordance with the provisions of product standards, technical documents and this standard. 5.2 The product must be accompanied by a quality certificate issued by the quality inspection department of the manufacturing unit before it leaves the factory. 6 Marking
6.1 When the product leaves the factory, it must be accompanied by a product certificate. .139
6.2 The product certificate shall include the following contents: a) Name of the manufacturing unit; t)
JB/T4328.8-1999
b) Product name, model (drawing code) and specifications: c) Product factory number and date of manufacture;
d) Signature of the inspector and the person in charge of the inspection department. 1) When the design and manufacturing are not done by the same unit, the name of the design unit should be indicated. 140
JB/T4328.8-1999
Appendix A
(Appendix to the standard)
The coaxiality, end face parallelism, radial displacement and angular displacement of the two connecting shafts of the coupling The coaxiality, end face parallelism, radial displacement and angular displacement of the two connecting shafts of the coupling shall comply with the provisions of Table A1. Table A1
Coupling
Oldham type
Elastic sleeve pin
Coupling rim diameter
100~300
>300-600
170~185
220-250
290~430
490-590
Coaxiality
End face parallelism
Radial displacement
Angular displacement
Aα degrees
See Table B1 for the tightening torque of ordinary bolts.
Strength grade
JB/T4328.8-1999
Appendix B
(Appendix of the standard)
Tightening torque of storage bolts
Tightening torque
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