The Research Progress of High Efficiency Energy-Saving Grinding Equipment

This paper explains some deficiencies of grinding equipment in our country at present,introduces the angular screw lining plate and trench lining plate from mill lining plate ,also their application effects; and introduces the static and dynamic pressure bearing and the center drive energy-saving mode from the transmission part, on the basis of which take a brief introduction of a new device and its application status, then the development trend in the future is prospected.

On Pressure Distributions of Drum Brakes

Based on the assumptions that there is perfect contact at the interface between the brake drum and the lining plates, the friction coefficient is constant, the thermal effect is neglected, and the brake drum is a rigid body, the pressure distributions of drum brakes were studied by using the boundary element method. The constant element is used in the two-dimensional model of the drum brake for simplicity and economy. The friction force versus the effective lift at the actuation edge and the location of the maximum pressure are compared and indicate a good correlation with existing data. The effects of the Young’s modulus of elasticity of the metal shoe, the arc lengths of the metal shoe and lining plate, the location, the thickness, the friction coefficient, the Young’s modulus of elasticity of the lining plate, and the angle of actuation force on the pressure distributions were then studied. By selecting proper values of these parameters, a drum brake can be designed to have a more uniform pressure distribution and a longer life.

Pressure Distributions of Drum Brakes

With the assumptions that the interface between the brake drum and the lining plates is perfect contact, that the friction coefficient is constant, that the thermal effect is neglected, that the brake drum and metal shoes are rigid, the pressure distributions of drum brakes are studied by using the boundary element method. The constant element is used in the two dimensional model of the drum brake for simplicity and economy. The pressure distributions on the metal shoe and the lining plate and the friction force versus the effective cam lift are compared and show good agreement with the available data. The effects of the Young’s modulus of elasticity, the angle of the arc length, the friction coefficient, the location and the thickness of the lining plate, the Young’s modulus of elasticity and the angle of the arc length of the metal shoe, and the angle of the actuating force on the pressure distributions of the drum brakes are then studied.