Modification of the adjustment process for the diesel generator assembly vehicle of DF4B locomotive Zhao Weining (Hangzhou Hangzhou B10008, the locomotive section of Hangzhou) The loading adjustment process has achieved good results in practical application. 11 Marking: The issue of B 1 has been raised with the continuous development of high-speed and high-power diesel locomotives, which puts forward higher requirements for traffic safety and the reliability of locomotive equipment. In operation, the locomotive not only constitutes a complex vibration system with the track, but it is also a complicated vibration system. The locomotive diesel generator set is one of the more important vibration sources. Therefore, in the new DF4B locomotives, overhauls, and repairs, the installation and adjustment of diesel generators is an important process. In 2000, the locomotives that were put into operation in the overhaul (or intermediate repair) section of the Hangzhou Locomotive Depot had several locomotives that experienced large vibrations. The driver’s room radios, horns, and consoles were violently vibrated. The vibration of the electric cabinets in the electric rooms was abnormal and the vibration levels varied. Increased engine speed and intensification caused the oil and water lines to crack, leak, loosen and loosen the wiring, affecting the normal operation of the locomotive. Through the inspection of the passengers and the water resistance of the locomotives, the relevant personnel analyzed the phenomenon of abnormal vibration. Initially, it was considered that there was a problem with the assembly of the diesel engine and the generator, and that a few typical locomotives were before and after the diesel engine generator set. Tracked. The results show that the assembly size and state of the diesel engine and the main generator are in line with the process requirements, and there are no problems with the generator motor bearings and assembly. However, at the same time, it was found that the two opposing rubber components in the four elastic supports of the diesel generator set were partially damaged. Furthermore, it is thought that it is the quality of a rubber element. After replacing the new products, re-install and adjust, and meet the requirements of "DF4B diesel locomotive segment repair technical regulations" (hereinafter referred to as segment regulations). However, after the locomotives were put into use, the problem of excessive vibration still existed. It is more typical that the B locomotives B886, B887 and B888 were suspended from the unit for inspection due to abnormal vibration during the 2 mid-haul repairs. 2 Reasons for the generation of abnormal vibration: 20004-25 Lianzhong University Diesel locomotive professional, Bachelor of Engineering, now mainly engaged in the maintenance and management of diesel locomotives. 2.1. Elastic support structure factors The total weight of the generator set is approximately 28t mounted on the frame through four elastic support blocks, each bearing approximately 68.6kN of vertical load. The rubber support is used to absorb high-frequency chatter, mitigate the vibration between the diesel generator set and the frame, and shock vibration from the line to avoid the resonance of the diesel engine within the working speed range. For the position of the diesel generator set on the vehicle, see Elastic Support Structure. See. The static stiffness of 66.6 kN/cm shows that the height difference between the seat surfaces of four rubber components is not more than 1 mm in the segment gauge, which corresponds to a vertical force difference of 4 rubber components that does not exceed 6 kN, and that the four rubber components are evenly distributed. . According to the analysis of the field test results, the diesel generator set only meets the requirements of 4 rubber components with a difference in static deflection of less than 2mm during assembly, and the requirements for the H differential H of 4 elastic support blocks after installation are not greater than 1mm, and cannot fully guarantee 4 The force of the elastic support is within the allowable range, and it is often the case that the force at the two diagonal points is larger than the uniform force at the four points. When the diesel engine works, resonance occurs and supernormal vibration occurs. 2.2 Other factors From the perspective of rubber components, due to the different manufacturers of rubber components, there is a certain difference in the original size of the rubber components; at the same time, there are errors in the processing of the conical surfaces of the upper and lower bearing seats that are matched with the rubber components; If the four seat plates on the frame are installed in different heights and conditions, it may cause inconsistent forces on the four elastic supports. The four elastic bearing stress conditions are ultimately reflected in the deformation of the elastic element subjected to vertical loads. 3 Improved installation and adjustment process of diesel generators Usually, when the locomotives are repaired by the locomotives, most of them do not have the conditions for testing and adjusting the horizontal height of the four bearing seats on the vehicle body. Four seats are on the frame. The position status can only refer to the measurement results when new or overhauled. Previously, in order to meet the requirements of the maintenance procedures during the installation adjustment of the unit, the method of adjusting the thickness and number of gaskets under the bearing seat was adopted to ensure that the 4 bearing groups after the diesel generator assembly vehicle were not larger than 1 mm but the result had affected the frame of the motorcycle. The relative position of the four bearing seat surfaces. Through repeated practice and exploration, it is considered that the following improvement process is better. 3.1 Increase the pressure test process of rubber components The structure of tapered elastic components can be divided into vertical static deflection and lower circumferential deformation when subjected to vertical loads. Therefore, the rubber component pressure test process can fully reflect its performance. . In the process equipment, it is necessary to make a pair of pressure-testing process tires and perform accurate measurements when the rubber elements are pressure-tested, and record the free height, the circumferential dimension S at a distance of approximately 50 mm from the bottom height in the free state, and the loading at 70 kN. Static deflection, data of circumferential dimensions Si at a height of 50 mm from the bottom. 3.2 Adjustment and Assembly Work During the repair work of the locomotive, when hanging the diesel engine unit, record the matching status of the rubber element and its corresponding upper and lower bearings, and the pad thickness of each support seat, and mark them. When the diesel generator set is pre-assembled, the bearing bases and pad thicknesses are restored according to the recorded dimensions, and assembled with rubber elements that meet the static deflection values ​​required by the maintenance regulations. After pre-installation, check that the AH of the 4 bearings should be no more than 1mm. Check the contact between the rubber element and the upper bearing. Measure the circumference of the rubber element corresponding to the size S/ and the circumference of the rubber when it is independently loaded to 70kN. Comparing Si, the two values ​​can differ by a maximum of 8mm, such as 4 bearing over 1 or a poor contact of a rubber element, a gap at the tapered surface, and insufficient circumferential deformation (or a good elastic element contact, but the circumferential deformation amount Large) Selectable to meet the static deflection value of 70kN and the free height of the rubber components to replace the pre-installed to meet the requirements within 1mm, do not use cutting seat plate method to adjust the support position, so you can guarantee 4 The difference in the height of the support. There are three kinds of pre-assembly results, and the corresponding adjustment scheme is as follows: A/ should be Si, and the difference exceeds 8mm, indicating that the 1,3 bearing force is greater than 1mm, the contact is not uniform, and the Sr' of the 2 and 4 supports is smaller than the corresponding Si, and the difference exceeds 8mm, indicating that the 2 and 4 bearing forces are small. At this time, the static deflection may not exceed the limit, and the rubber elements with large free height value may replace the rubber elements in the second and fourth positions, or the free height value is small. The rubber element replaces the rubber elements in the 1st and 3rd positions. 1, Usually when this occurs, the H-bearing conical surface of the four supports has gaps and gaps, and its circumferential dimension S/ is very different from its corresponding Si (Si 8 mm) or H is the smallest support. There is no gap at the joint of the conical surface, and the rubber element has large circumferential deformation (S/―S, >8mm). At this point, the highest and lowest supporting points of the rubber element are replaced firstly to reach the A/ preloaded diesel generator set, and four elastically supported Hs are recorded for the diesel engine set installation process. 4 Concluding remarks This process method has proved to be effective through a mid-repair process, which not only effectively controls the installation status of the diesel generator set, but also reduces the replacement cost of the rubber components. The method simply reduces the installation time of the adjustment process. More than two years after the implementation of this process, about 100 locomotives have never experienced such extraordinary vibrations. 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