Optimized mathematical model of design: design a valve spring. Known: installation height H=5088mm, initial load F=272N, maximum working load F=680N, working stroke H=10.16mm, spring working frequency f=50Hz, spring wire material is 50crVA, oil quenching and tempering, shot peening The working temperature of the spring is 126C, the total number of support turns n=1.75, the winding ratio, the relative error of the spring stiffness does not exceed 0.01, the working reliability of the working life N=107 times is R=0.95, and the spring is designed according to the principle of the lightest quality. The parameter scheme. According to the above analysis, the data is substituted into the formula to obtain the mathematical model of the spring reliability optimization, which is a three-dimensional optimization problem with 12 inequality constraints. Since the problem is low in dimension, the constrained random method can be used to select the initial point given the initial step size.
In the design of the valve spring of the internal combustion engine of the vehicle, not only the uncertainty of various factors affecting its work is considered, but also the reliability of the product at work can be quantitatively answered, so that the design is more in line with the engineering practice. In addition, the reliability and the optimization parameters are closely related to the form of the function. Except for the unfavorable factors that the safety factor value is affected by the experience of the designer, the designed spring structure size is more compact than the conventional design, and the volume is reduced. Can reduce costs. Although this difference may not be obvious, the reliability of the conventionally designed spring is ambiguous, we can't know its reliability, and the reliability of the spring designed with reliability has been quantified, the work safety level At a glance.
Development and application of the loader crusher and the front of the transport machine head and the end bracket, and the other group to dismantle the power center and the pump station system; after the removal of the transport machine in front of the work, the work surface is laid, and the ventilation system is modified in 2103 lane Ready to work.
Dismantling of the working face and the equipment of the 5103 lane: After the end of the working face is stopped, the first DD of the DD is removed from the front of the large chain DD after the work is removed. The rear tail can be paralleled with the removal of the shearer. After the operation, then remove the front slot in the middle, and wait for the front to be removed. You can carry out the work surface and the parallel work to remove the work surface and then slide the middle slot.
After the equipment is removed, the reasonable transportation vehicles are transported out of the ground for maintenance according to the weight of the equipment. There are mainly bracket trucks, ED40 forklifts, multi-purpose trucks and ordinary explosion-proof vehicles. The loading method is coordinated with the forklift and the lifting pulley. Winch to complete.
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