Improvement of adjustment technology for diesel generator assembly car of DF_ (4B) locomotive

The adjustment technology improvement of DF4B locomotive diesel generator assembly vehicle, Zhao Weining (Hangzhou locomotive depot Zhejiang Hangzhou B10008) loading adjustment process, the process has achieved good results in practical application.
11 sign code: B 1 question put forward, along with the constant development of diesel locomotive to high speed, high power direction, put forward higher requirements to the safety of driving, the reliability of locomotive equipment and so on. The locomotive is not only a complex vibration system, but also a complicated vibration system. The locomotive diesel generator set is one of the most important vibration sources. Therefore, the installation and adjustment of diesel generator set is an important process in the new system, overhaul and medium repair of DF4B locomotive.
In 2000, the Hangzhou locomotive depot overhaul (or repair) into the locomotive, there have been several locomotive vibration, cab radio, horn and console vibration and abnormal vibration in electrical electrical cabinet, and the vibration degree with engine speed increase and aggravate, to loosen the oil piping crack leakage, sealing off and wiring, affecting the normal operation of the locomotive.
The crew and locomotive water resistance test bench, the relevant personnel of the abnormal vibration phenomena are analyzed, the diesel engine and the generator assembly was initially thought to have problems, and for a few typical locomotive in repair and a diesel engine generator for tracking. The results show that the size and assembly state of the diesel engine and the main generator meets the process requirements, the generator motor bearing and assembly is not a problem; but at the same time that the 4 elastic support of diesel generator, local 2 rubber elements relative to the damage, and that is due to the quality of rubber components. After the new product is replaced, the installation and adjustment are carried out, and the requirements of the technical specification for DF4B diesel locomotive depot repair (hereinafter referred to as the section code) are met. But after the locomotive is put into use, the problem of abnormal vibration still exists. Typically, the B886, B887, and B locomotives during the 2 maintenance period were all checked out due to the abnormal vibration of the B888 locomotive.
2 causes of supernormal vibration: 20004-25. Diesel locomotive specialty, Bachelor of engineering, and mainly engaged in diesel locomotive maintenance and management work.
2.1 the total unit weight of the elastic support structure is about 28T, which is installed on the frame through 4 elastic supporting seats, each bearing approximately carrying the vertical load of 68.6kN. Rubber supports are used to absorb high-frequency chatter, to mitigate vibration between the diesel generator set and the frame and from the impact vibration of the line, so as to avoid the resonance of the diesel engine in the working speed range.
The supporting structure of diesel generator set is supported by elastic support.
The static stiffness 66.6kN/cm shows that the seat height difference of 4 rubber components in the section gauge requires no more than 1mm, and the corresponding vertical force difference between the 4 rubber components is not more than 6kN, and the force of the 4 rubber components is uniform.
Through the analysis of field test results that diesel generators only meet 4 rubber element static deflection is less than 2mm after the installation of up to 4 elastic supporting seat H H less than 1mm at the request of the assembly, and cannot guarantee 4 elastic support force in the allowance range, and is often the diagonal 2 larger force, rather than the 4 point uniform stress, resonance occurs in the diesel engine work, produce abnormal vibration.
2.2 other factors from the rubber components, the manufacturer of rubber components, rubber components. There are some differences in size; the conical surface processing at the same time is matched with the rubber components of the upper and lower supporting seats are error; in addition, the 4 block plate frame installed on the level of different state, may have caused 4 elastic support force is not consistent. The stress state of the 4 elastic supports is ultimately reflected in the deformation of the elastic element subjected to the vertical load.
Diesel generator 3 improved installation and adjustment process of locomotive depot repair usually, most do not have on the body on the 4 supporting seat surface level test, the adjustment condition, position state can only be on the frame of the 4 seat surface in the new reference or overhaul the measurement results. Before the installation adjustment to meet the specification requirements, take the adjustment method of gasket thickness and quantity under a supporting seat to ensure the 4 support group of diesel generator assembly after the car is not greater than 1mm but the result has affected the relative position of locomotive frame 4 supporting seat surface. Through many practice and exploration, it is considered that the following improvement process is better.
3.1 increase of rubber element pressure testing process conical elastic element structure under vertical load, the deformation can be divided into vertical static deflection and lower deformation of the two part, therefore, the rubber element pressure test process can fully reflect the performance. In the process of equipment, to make a pair of pressure test process for accurately measuring and test pressure in rubber components, record the height, the free state from the bottom height of about 50mm circumference size S and load 70kN, the static deflection from the bottom 50mm circumference size Si data.
3.2 adjust the assembling condition of the rubber element and the corresponding upper and lower support, and the thickness of each supporting seat, and mark the diesel engine set when the diesel engine unit is assembled and repaired.
When the diesel generator set is preloaded, the supporting seat and the thickness of the cushion are restored according to the recording size, and the rubber components are assembled with the static deflection value according to the requirements of the maintenance procedure. Check the AH of the 4 supports should be no more than 1mm before installation, check the contact between the rubber element and the upper support, and be uniform and gapless. Measure the corresponding circumference dimension S/ of the rubber element, and achieve the same value