This standard specifies the technical requirements for the assembly of light industrial machinery products. This standard applies to the quality requirements of light industrial machinery products (hereinafter referred to as "products") and component assembly and the overall assembly of complete machines. Based on this standard, each type of product should make specific provisions in its own product standards according to its characteristics. QB/T 1588.3-1992 General Technical Requirements for Light Industrial Machinery Assembly QB/T1588.3-1992 Standard download decompression password: www.bzxz.net

Light Industry Industry Standard of the People's Republic of China
Light Industry Machinery
General Technical Conditions for Assembly
1 Subject Content and Applicable Models
This standard specifies the technical requirements for the assembly of light industry machinery products. QB/T 1588. 3--1992
This standard applies to the quality requirements for light industry machinery products (hereinafter referred to as "products") and component assembly and complete machine assembly. Based on this standard, each type of product should make specific provisions in its own product standards according to its characteristics. 2 Reference standards
GB/T3766 General technical conditions for hydraulic systems GB/T 5226Www.bzxZ.net
GB/T 7932
GB/T 7935
General technical conditions for electrical equipment of machine tools
General technical conditions for pneumatic systems
General technical conditions for hydraulic components
GB/T14253 General technical conditions for light industrial machinery JB/T 4127
General technical conditions for mechanical seals
ZBJ22005
Technical conditions for light mechanical seals
3 Basic requirements
3.1 Products should be assembled according to the drawings and assembly processes approved by the prescribed procedures. The parts and components (including purchased parts) assembled to the products should comply with the provisions of relevant technical documents and standards. 3.2 The assembly environment should be clean. The parts to be assembled should be cleaned. During the assembly process, the surface of the processed parts should not be bumped, scratched or rusted. The mating surface and exposed surface of the processed parts should not have traces of filing and grinding. The hardness of the assembly tools that contact or knock with the assembly parts during assembly should be much smaller than the hardness of the assembly parts.
3.3 After the moving and rotating parts are assembled, the operation should be smooth, flexible, light and without obstruction. The displacement mechanism should ensure accurate and reliable positioning. 3.4 The reverse idle stroke of the handwheel and handle with a scale device after assembly should comply with the provisions of relevant standards and technical documents. 3.5 When assembling springs, there should be no elongation or cutting beyond the provisions of the technical documents. 3.6 After the matching parts (such as matching drilling, matching tapping, matching reaming, matching riveting, etc.) are matched, iron cuttings and burrs should be removed, and the surface of the parts should not be damaged or deformed during the matching process.
3.7 Various pressure, flow, speed, angle and distance adjustment mechanisms should ensure their adjustment range according to the drawings to achieve accurate positioning, clear display, flexibility and reliability.
3.8 When assembling rotating parts and components with special requirements, static and dynamic balance tests should be carried out in accordance with relevant regulations. 3.9 The connection of boxes, tanks, accumulators and various valves, instruments, etc. installed on the products must be tight. There should be no leakage during normal operation.
3.10 The assembly of electrical systems shall comply with the relevant provisions of GB/T5226. 3.11 The assembly of hydraulic systems shall comply with the provisions of GB/T3766 and GB/T7935. Approved by the Ministry of Light Industry of the People's Republic of China on August 31, 1992, and implemented on April 1, 1993
QB/T1588.3-1992
3.12 The assembly of pneumatic systems shall comply with the relevant provisions of GB/T7932. 4 Assembly of parts and components
4.1 Assembly of rolling bearings
4.1.1 Before assembling rolling bearings, they must be cleaned and coated with clean lubricating grease. The lubricating grease applied to the rolling bearing should be less than one-third of the space inside the rolling bearing. When the bearing cover cannot be installed immediately, it should be covered with clean oil paper to prevent debris from mixing into the bearing. 4.1.2 During assembly, there should be no defects such as burrs, rust and spots on the matching surfaces of the shaft and the bearing seat. 4.1.3 When assembling the rolling bearing on the spindle, it should be installed according to the high and low point marks of the spindle journal and the bearing ring. For products with high precision requirements, the rolling bearings of the spindle should generally be selected or cold-mounted. 4.1.4 When assembling bearings with transition (or interference) fit by heating, the heating should be uniform and the temperature should generally be below 100C. 4.1.5 When assembling bearings with interference fit, a device without impact load should be used, and it is strictly forbidden to directly hit the bearing cabinet. The assembly position of the bearing housing should be correct, the force should be uniform and there should be no damage. 4.1.6 The joint surfaces between the bearing housing, gasket and gland must be parallel. 4.1.7 The assembled bearing should ensure the bearing clearance according to the use requirements. When the shaft or bearing is turned by hand, the bearing should be able to rotate evenly, lightly and flexibly.
4.2 Assembly of sliding bearings
4.2.1 The oil grooves on the bushings and bearings must be smooth and clean. 4.2.2 The edges of the oil grooves of sliding bearings should generally be inverted and the oil holes should be unobstructed. 4.2.3 The gaskets at the joints of the bearings should be placed on the stabilizing pins, and the gaskets should not contact the shaft. The contact angle between the bearing (bushing) and the journal should be within the range of 90°~120°, and the contact spots should not be less than 4 points within the area of ​​25mm×25m. The clearance between the bearing (bushing) and the journal should comply with the requirements of the drawing.
4.2.4 The end of the fixing pin or screw used to fix the bearing or bushing should be buried in the end face of the bearing or bushing. 4.2.5 After the bearing is assembled, the shaft must be able to run freely in the bearing. 4.3 Assembly of gears, worm wheels and worm gears
4.3.1 Gears, worm wheels and worm gears should be free of corners and burrs before assembly. 4.3.2 The contact spots of gear pairs, cylindrical worm pairs (staggered axis gear pairs), etc. should comply with the provisions of relevant standards. 4.3.3 The axial positioning of the assembled gears should be accurate and reliable. 4.3.4 The assembled gears, worm wheels and worm gears should run smoothly, flexibly and accurately. 4.3.5 The radial runout of the gear ring after the high-speed gear of the main drive is assembled with the shaft should comply with the provisions of the technical documents. 4.3.6 The axial misalignment of the meshing gears shall not exceed 1mm when the width of the meshing gear rim is less than or equal to 20mm; when the width of the meshing gear rim is greater than 20mm, it shall not exceed 5% of the rim width, but shall not exceed 5mm. 4.3.7 After the main transmission box is assembled, an idling test shall be carried out, running step by step from low speed to high speed. The running time at each speed shall not be less than 2min, and the running time at the highest speed shall not be less than 1h. Check the following items: The speed control mechanism shall be flexible and reliable;
The operation shall be smooth, and there shall be no abnormal sharp belt or impact sound; The radial runout and axial movement of the main shaft shall comply with the provisions of its product standards: After the main bearing operates normally and reaches a stable temperature, its temperature rise and maximum temperature shall comply with the relevant provisions of GB/T14253; d.
The oil circuit of the lubrication system shall be unobstructed and unblocked, and there shall be no oil phenomenon at each joint. 4.4 Assembly of screw and nut
4.4.1 When assembling the screw pair, the parallelism between the screw axis and the movement of its driving component shall comply with the requirements of the drawing or technical documents. 4.4.2 After the screw and nut are assembled, the matching clearance shall comply with the requirements of the drawing or technical documents. 4.4.3 For screw pairs with clearance elimination mechanisms, the adjustment amount after assembly shall comply with the design requirements. 4.5 Assembly of seals
Grease.
QB/T1588.3—1992
The various seals assembled on the product should not be damaged. When assembling, the lips and surfaces of the seals and the shafts should be coated with grease. The assembly direction of the seals should be such that the working pressure of the medium presses its lips tightly against the shaft. 4.5.2
4.5.3 When assembling overlapping sealing rings, the rings should be pressed against each other, and the opening direction should be towards the side with greater pressure. The seal of rotating machinery shall comply with the relevant provisions of JB/T4127, and the seal of light machinery shall comply with the relevant provisions of 4.5.4
of ZBJ22005.
5 Assembly requirements
5.1 During the assembly of the product, the installation level should be adjusted and displacement should be prevented. 5.2 The main joint surfaces of the mating parts should be checked for the number of contact points of the scraped surface. 5.2.1 When the joint surfaces of the two mating parts are both scraped surfaces, and the joint surface grinding tool of the mating parts is used for coloring inspection, the scraped points should be uniform. Generally, it is calculated on average according to the specified calculation area. In each 25mm×25mm area, the number of contact points is recommended to be not less than that specified in Table 1. Table 1
Hydrostatic, sliding (rolling) guide rails
Transfer guide rails
Guide rail width/mm
Note: 1) " indicates ordinary products.
≤100
Spindle sliding bearing
Diameter/mm
≤120
2) 1 indicates more precise products. Refers to products with high precision requirements and more precision items. Strip pressure plate
Sliding surface||tt ||Particularly important
Fixed joint surface
5.2.2 When the joint surface of two mating parts is a scraped surface and the other is a machined surface, the contact points of the scraped surface shall not be less than 75% of the points specified in Table 1 when the machined surface of the mating part is used to check the contact points of the scraped surface. 5.2.3 For the joint surface of two mating parts, the minimum number of points within an individual 25mm×25mm area (one or two places) shall not be less than 50% of the points specified in Table 1.
5.2.4 When the joint surfaces of the two matching parts are processed by mechanical processing methods, the coloring method should be used for inspection and the contact should be uniform, and the contact area should not be less than the requirements of Table 2.
Sliding (rolling) guide rail
Over the entire length
Over the width
Over the entire length
Transfer guide rail
Over the entire width
Note: ① Only when the contact in width reaches the specified index can the length calculation be made. ②The inlay strip is inspected according to the contact index of the matching guide rail, especially the important fixed joint surface
Over the entire length
5.2.5 When the important fixed joint surface is inspected with a feeler gauge after tightening, the thickness of the feeler gauge should not be greater than the requirements of Table 3. Table 3
Thickness of feeler gauge
Over the full width
QB/T1588.3-1992
5.2.6 Particularly important fixed joint surfaces perpendicular to the horizontal plane can be inspected after tightening. When inspecting with a feeler gauge, the local (up to two places) insertion depth is allowed to be less than 1/5 of the joint width, but not more than 6mm. The length of the inserted part shall not be more than 1/5 of the length of the joint surface, but not more than 100mm and shall be counted by place.
5.2.7 In addition to the color coating method, the sliding and displacement guide surface shall also be inspected with a 0.04mm feeler gauge. The insertion depth of the feeler gauge between the sliding surfaces of the ends of the guide rail, insert strip, etc. is generally not more than 25mm. 5.3 Adjustment margin should be left after the insert strip is assembled. 5.4 The rolling guide surface should be in uniform contact with all rolling elements, and the movement should be light, flexible, and without obstruction. 5.5 The contact length of the important positioning cone pin shall not be less than 60% of the working length of the cone pin and shall be evenly distributed on both sides of the joint. 5.6 After the belt tensioning mechanism is assembled, it shall have sufficient adjustment capacity; the symmetric surfaces of the active and driven pulleys shall overlap, and the belt shall not have obvious pulsation during transmission. For more than two V-belt transmissions, the tightness of the belts after assembly shall be basically consistent. 5.7 The drive and control devices supplied with the product shall be installed on the product for testing. 5.8 The cleanliness of the product after assembly shall comply with the provisions of the relevant standards. 5.9 After the product is assembled, a comprehensive acceptance inspection shall be carried out in accordance with the relevant provisions of GB/T14253. Additional remarks:
This standard is proposed by the Technical Equipment Department of the Ministry of Light Industry. This standard is under the jurisdiction of the National Light Industry Machinery Standardization Center. This standard is drafted by the Hangzhou Light Industry Machinery Design Institute of the Ministry of Light Industry, Jiangxi Jingdezhen Ceramic Machinery Factory, and Hunan Light Industry Machinery Factory.
Who are the main drafters of this standard? Lang Huiqin, Xiang Saoliang, and Liu Huaqing. From the date of implementation of this standard, the former Ministry of Light Industry of the People's Republic of China standard QB/T842.6-1982 "General Technical Conditions for Assembly of Light Industry Machinery Scales" shall be invalidated.
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