Inspection process and results Firstly, a thin layer of red coloring agent which is not easy to dry is applied to the inner surface of the circular hole of the bottom plate, and then the ultimate load and the ultimate deformation amount are respectively applied to the sample. During the loading process, the appearance of the product showed no obvious damage, and no obvious abnormal sound was heard in the product; after unloading, the inner surface of the product mandrel and the bottom hole of the bottom plate were inspected, and no red coloring agent was found on the mandrel, indicating that the product There is no contact or collision between the metals.
Damping test Metal-rubber composite conical springs must be able to provide sufficient damping because the hydraulic suspension is not used in a series of suspensions. Therefore, it is required to test the damping performance of the sample in the vertical direction. The test conditions of the damping performance of the sample are as follows: According to the test requirements of the vertical dynamic stiffness of the sample, the product is measured under the conditions of amplitude 10 mm, frequency 0.11 Hz, amplitude 5 mm, frequency 1 Hz, amplitude 3 mm, frequency 5 Hz. Damping value. The damping value is calculated as: DAMP=(K@sinD)/(2P@f).
Change the abscissa time to logarithmic coordinates, and find that the creep variable has a linear relationship with the logarithm of time. (Note: This relationship needs further verification. Because there is no other estimation method at present, use this relationship for the time being. Estimate), through this linear relationship, the total creep of the sample in the first year will reach 714mm, and the creep obtained by this creep test does not include the influence of environmental changes and dynamic loads on the creep. Therefore, the total amount of creep in the first year of actual use may exceed 9 mm, so the sample must be improved.
The creep of the metal-rubber plastic turnover box composite conical spring is unavoidable, but the creep resistance of the metal-rubber composite conical spring can be improved by improving the formulation and structure of the rubber. In the process of developing metal-rubber composite conical springs, it was found that by adjusting the rubber reinforcing system, the high structure modified carbon ink and the improved product structure can greatly improve the creep resistance of the sample. 6 is the creep performance curve of the improved metal-rubber composite conical spring. The creep value of the 72h is 1191mm, and the total creep estimate of the sample in the first year will not exceed 315mm, plus environmental changes and dynamic loads. The effect on the creep variable.
Truck maintenance is implemented in a centralized and unified management, and dynamic monitoring and inspection of expired vehicles. At present, all major problems in the maintenance of locomotives in the United States are decided by the headquarters of the railway company. The repair work of locomotives, including overhaul, medium repair, minor repairs and production plans, is centrally managed by the headquarters. With reference to foreign management experience, China's maintenance command organization should be established as soon as possible, and through the HMIS system platform, the commanding inspection tasks specific to a certain vehicle number should be issued to the vehicle sections of the country every day. Dynamic monitoring of each of the expired vehicles in the country, the command center staff will issue commanding tasks to the depot according to the principle of expiring the deduction, and immediately enter the line for repair after expiration, and fundamentally solve the inspection. Expired car problem.
Reasonable layout of the repair base. In order to make the layout of the depot reasonable layout according to the actual expired empty vehicle production, two ways of planning layout and market adjustment can be adopted. According to the actual number of trucks, the plan layout analyzes the existing traffic flow, especially the empty traffic flow direction, and carries out the reasonable layout of the vehicle segment according to the degree of intensive traffic flow. The market regulation means that the Ministry of Railways does not release the annual maintenance task, and only examines various types of vehicles. During the repair time, the fixed-vehicle expired vehicles to be repaired are opened to the respective depots.
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