STIFFNESS CALCULATION OF THE CLAW CURTAINS AXES

UDC 674.055:621.93.023.2

  • Grinevich Sergey Anatol’yevich − PhD (Engineering), Associate Professor, Assistant Professor, the Department of Woodworking Machines and Tools. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: grinevich@belstu.by

  • Grishkevich Aleksandr Aleksandrovich − PhD (Engineering), Associate Professor, Head of the Department of Woodworking Machines and Tools. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: dosy@belstu.by

DOI: https://doi.org/10.52065/2519-402X-2021-246-45-345–349

Key words: claw curtain, axis, strength, rigidity, deformation.

For citation: Grinevich S. A., Grishkevich A. A. Stiffness calculation of the claw curtains axes. Processing of BSTU, issue 1, Forestry. Nature Management. Proceedings of Renewable Resources, 2021, no. 2 (246), pp. 345–349 (In Russian).DOI: https://doi.org/10.52065/2519-402X-2021-246-45-345–349.

Abstract

One of the factors of injuries in woodworking industries is the reverse ejection of the processed material or its elements. The greatest risk of the ejection is typical for woodworking circular sawing machines for longitudinal sawing of natural wood. To hold the workpiece or its elements in the machine curtains of safety stops (claw curtains) are designed.

The main requirements for the design of a claw curtain are given in the technical regulations. One of the conditions for the effective operation of curtains of safety stops is the strength and rigidity of its elements and, above all, the axis on which the safety stops are movably set. And if from the point of view of strength, regulatory documents define the requirements for its material, then from the point of view of rigidity, there are no such requirements. At the same time, the deformation of the axis during the impact load can be significant. This is confirmed by the experience of analyze the designs of circular sawing equipment, where accidents associated with the reverse ejection of material have occurred. The safety stops on such machines were often turned in the opposite direction from the feed direction, and the axis of the claw curtains had a significant plastic deformation.

In the paper the requirements of technical regulations for the parameters of the axes of the claw curtains are presented and analyzed. Based on the recommended parameters of the axis geometry and the requirements for its strength, the deflection depending on the different ways of fixing it is calculated. The conducted research revealed problems when using the recommendations of regulatory acts.

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References

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