Ltd. in the production of underground trackless equipment in the process of strict implementation of the following standards

1. Each seal must be soaked in oil before assembly.

2. Assembly of rolling bearings is allowed to use oil heating for hot assembly, the temperature of the oil shall not exceed 100 ℃.

3. The assembly of hydraulic system allows the use of seal packing or sealant, but should be prevented from entering the system.

4. into the assembly of parts and components (including outsourced parts, outsourcing parts), must have the inspection department's certificate of compliance before assembly.

5. Parts must be cleaned and cleaned before assembly, there should be no burrs, flying edges, oxide, rust, chips, oil, coloring agents and dust, etc.

6. Before assembly should be zero, parts of the main fit size, especially the interference with the size and accuracy of the relevant review.

7. The assembly process parts are not allowed to bump, touch, scratch and rust.

8. Screws, bolts and nuts tightening, it is strictly prohibited to strike or use unsuitable spinning tools and wrenches. After tightening the screw slot, nut and screw, bolt head must not be damaged.

9. Fasteners with tightening torque requirements must be tightened with a torque wrench and fastened according to the specified tightening torque.

10. The same part with more than one screw (bolt) fastening, the screws (bolts) need to be crossed, symmetrical, gradually and evenly tightened.

11. Taper pin assembly should be checked with the hole should be painted, the contact rate should not be less than 60% of the mating length, and should be evenly distributed.

12. Flat key and shaft keyway on both sides of the surface should be uniform contact, the mating surface shall not have a gap.

13. Spline assembly while contacting the number of tooth surface not less than 2/3, the contact rate in the key tooth length and height direction shall not be less than 50%.

14. Sliding fit of the flat key (or spline) after assembly, the phase fittings move freely, there shall be no uneven tightness

phenomenon.

15. After bonding should clear the excess adhesive flow.

16. Bearing outer ring and open bearing housing and bearing cover of the semicircular hole is not allowed to have the phenomenon of jamming.

17. Bearing outer ring and open bearing seat and bearing cover of the semicircular hole should be in good contact, with the color check, and bearing seat in symmetry in the center line 120 °, and bearing cover in symmetry in the center line of 90 ° range should be uniform contact. In the above range with a ruler check, 0.03mm of the ruler shall not be plugged into the outer ring width of 1/3.

18. Bearing outer ring assembly and positioning end bearing cover end face should contact evenly.

19. Rolling bearing should be flexible and smooth after assembling and rotating by hand.

20. The combination surface of the upper and lower shaft tile should be closely affixed and inspected with 0.05mm plugging rule.

21. When fixing the shaft tile with locating pin, should ensure that the tile mouth surface and end surface and the relevant bearing hole open and closed surface and end bread hold flush state drilling and reaming, with pin. The pin shall not be loosened after the pin is driven.

22. Spherical bearing bearing body and bearing seat should be uniform contact, using the coloring method to check, the contact should not be less than 70%.

26. The combination surface of gear box and cover should be in good contact.

27. Strictly check and remove the sharp corners, burrs and foreign matter left when the parts are processed before assembly. Ensure that the seals are not scratched when they are installed.