Advanced Materials Research Vol. 619

Abstract: There are some problems in moving coil linear motor for Electro-hydraulic servo valve, such as big weight, small electromagnetic force, long response time and small bandwidth. After simulation analysis on permanent magnet placement and permanent magnet magnetization direction, it is found that distribution of magnetic field lines is uneven, magnetic flux density is low, and magnetic field lines are not vertical with the coil current direction. To solve these problems, a new type of linear force motor with 5 rings stack Halbach permanent magnet array structure is put forward. Through using the new structure, the weight and volume of motor can be reduced, and the electromagnetic force can be increased. Simulation results show that for the new structure, under the coil displacement change, the output electromagnetic force changes little and can maintain good linearity. Using permanent magnet with same volume, the electromagnetic force produced by new force motor is 2.5 times as it is produced by current motor. If the electromagnetic forces produced by two structures are same, the step response time of new type can be decreased of 14.3%, and the bandwidth can be improved to 2 times.

Abstract: This paper aims at the problems of traditional compound pendulum jaw crusher including unreasonable structure design, heavy weight, low utilization of material and high cost, chooses moving jaw which is the key part of motion mechanism as the optimal design subject, uses finite element method, through statics analysis, obtains stress and displacement distribution of moving jaw that is under the action of maximum fracture force, realizes weak link and surplus part of primary structure. Based on the above-mentioned study, this article uses minimum weight of moving jaw as objective function, combines with structure characteristic of crusher, uses the ANSYS Parametric Design Language (APDL) to establish parameterization model, and combines with the optimal design module OPT, works out the minimum weight of moving jaw under the conditions of meeting intensity and stiffness. The result indicates that moving jaw is less than the original one by 27%, which saves material, reduces cost and weakens additional dynamic load that caused by inertial force of work mechanism, improves dynamics of mechanism to a cert extent, reduces the vibration of mechanism and the wear of part, and extends product service life.

Abstract: Given mathematics model and boundary conditions of the structure optimization for ultra-supercritical bypass valve (UBV) in operation. FEM results showed that 10 design variables and 178 sampling points are chosen for iteration, and the relationship between maximum equivalent stress and structure parameters are obtained by sensitivity analysis. By using Monte-Carlo method, the quantity of optimized sampling point can be reduced by 17% and calculation time is reduced clearly. The higher sensitivity parameters affecting target function are found by contrasting response degree, and improving the parameters directly is the way that enhances intensity of the UBV. Base on the sensitivity analysis, the linearized equivalent stress of weak place in the UBV can be reduced by 44% with the safety performance enhanced.

Abstract: To generate coal tar with coal is the key technology of coal chemical industry, the generated coal tar is one of the important industry fuel and chemistry raw materials, and more attentions were attracted in coal tar preparation and processing technologies in recent years. Therefore, review of the updated technologies is developed at the present work. As for coal tar preparation technology, coal carbonization processing and coal hydropyrolysis are mature and has been applied to industry production. In comparison, hydrogenation of coal tar is just at the development. In term of coal tar processing technology, the present leading directions are how to manufacture clean fuel as well as phenol. Based on the status of coal tar preparation and processing technology, resources recycling use isn’t enough, consumptions of per ton coal is higher, environmental pollution is serious, and deep processing technology of coal tar needs to be raised.

Abstract: Comparing to the common locking mechanisms, this paper designs a new type of rope locking device which applies the wedge self-locking principle and hydraulic force-amplifying mechanism. The dynamic simulation research on the locking rope device with the usage of the ANSYS/IS-DYNA, and the simulation shows that the locking rope device can realize the self-lock of the first rope; the force-amplifying mechanism can effectively improve the security and stability of the rope locking, and reduce the abrasion of the first rope. Meanwhile, the simulation results provide a theoretical basis for the design of the locking rope mechanism.

Abstract: In order to research the dust removal process of dust agent in coal working face, we design the proportional adding equipment of mine-used dust-fall agent for static pressure pipes in coal working face and establish the calculation model of process parameters of this equipment combining with pipe flow theory of fluid mechanics, and theoretically analyze the selection rules of components such as the high pressure piston pump and pneumatic motor power.the proportional adding equipment has been applied to coal working face. From the results of the application, this equipment for reducing dust concentration in coal working face (especially PM2.5) has the obvious effect.

Abstract: Considering the pollution on the environment using dynamite source in oil and gas exploration, harm and damage to people and building, the vehicle mounted hammer source which can replace dynamite source is presented. This paper describes briefly the basic structure and working principles of the vehicle mounted hammer source. A typical pneumatic circuit is researched and designed. And the pneumatic circuit is designed with the powerful functions of PLC, the hardware and software design are introduced. The system has advantages of strong striking force, high velocity, small gas consumption, simple structure and convenient control.

Abstract: The Hamiltonian Systems is applied for the bending of skew plate.In contrast to the traditional technique using only one kind of variables, the symplectic dual variables include displacement components as well as stress components. The analytic solutions are obtained under simple support which shows the effectiveness of the symplectic dual and indicates that this method is good in speed of convergence and reliability.

Abstract: For recovering low temperature waste heat from industrial process efficiently, the organic Rankine cycle (ORC) was puts forward to use for thermal power generation. The flue gas parameter of waste heat from a cement kiln was set the research object and ORC system thermal analysis model was established using R123 as working fluid. A calculation program was carried and two main factors were given and the influence rules of thermodynamic performance were analyzed. The results show that the net work of system increases first and then decreased with the evaporating temperature and pressure and a parabolic rule is formed. The maximum net work is 4510kW and corresponding optimum evaporating temperature and optimal evaporating pressure are 140 °C and 1.46MPa respectively; The thermal efficiency increases with evaporating temperature and evaporating pressure increasing. The highest thermal efficiency can reach 12.68%.

Abstract: The refuge chamber is an important part of the emergency refuge system in coal mine. This paper mainly introduced the design ideas of underground layout, structure, six systems of disaster prevention system, life support system, life support and emergency system, power supply system, communication system and external disaster information detection system in refuge chamber. This provides a scientific design basis for constructing refuge chamber in the coal mine.