Improvement of Machine Safety Devices

Abstract

The article presents a development of new machine safety devices, which provide protection of operating elements from overload. Theoretical calculations have been made in order to determine the optimum design, kinematic and dynamic parameters of safety devices. A test bench has been developed and experimental investigations have been conducted in order to determine basic parameters of overload clutches.Keywords: safety devices; overload clutch; design and kinematic parameters; dynamic load; test bench; operating elements of machines. J -equivalent drive moment of inertia; 21 J -equivalent drive half coupling moment rtia; 22 J -equivalent driven half coupling moment of inertia; 3with a screw operating element drive has been developed ( Figure 3). This model is described by the following set of equations:

Particle Motion Over the Edge of an Inclined Plane That Performs Axial Movement in a Vertical Limiting Cylinder

“…where β -the angle of the plane inclination (Figure 1b). When a plane segment rotates with the angular velocity ω, a particle in an absolute motion has to rotate in an ellipse (8). During the time t, an ellipse rotates through the angle ωt in the direction opposite to the particle sliding through the angle α.…”

“…The reaction N R is directed towards the centre of the cylinder perpendicular to its surface, that is to say, perpendicular to the circle, which is set by the first two equations in (8). The projections of the reaction force on the coordinate axes are written as:…”

“…It considers relative particle motion at a wide range of inclination angles of a plane to the axis of rotation, beginning from a horizontal position and finishing by a vertical one. The development of a bladed operating element of a conveyer-mixer is considered in paper [5][6][7][8][9][10].…”

Technology of Producing Reinforced Concrete Columns of Circular Cross-Sectional and Investigation of Their Strain-Stress State at Transverse-Longitudinal Bending

“…In building regulations for calculating the resistance of the oblique sections of reinforced concrete elements [1][2][3][4][5][6][7][8][9], empirical and semiempirical dependences are used, which does not make it possible to take into complete account the influence of the main factors on load bearing capacity across an oblique section. The deformation method [10][11][12][13][14][15] of calculating load bearing capacity of the normal sections of CCSC is grounded on clear physically based prerequisites and represents the physics of the process rather precisely, making it possible to develop a calculation basis for determining load bearing capacity according to the transverse force of the above mentioned sections [16][17][18][19][20]. Thus, the development of the deformation method of the assessment of strain-stress state and load bearing capacity of compressed-bent elements of CCSC is important in order to increase the reliability of engineering buildings and structures according to a valid diagram of vertical and horizontal loading, including accidental exposures.…”

Feasibility Study of Improving the Transport Performance by Means of Screw Conveyors with Rotary Casings

“…Findings of aforementioned researches show the improvement of characteristics of screw conveyors during transportation of bulk materials. Authors Baranovsky et al (2018), Hevko et al (2015) and Hevko et al (2018a) dedicated their investigations to the solving of aforementioned issues, namely the development of energysaving designs of screw conveyors and selection of their most efficient parameters and working modes.…”