Research and Development of Laser Engraving and Material Cutting Machine from 3D Printer

Durna, Antonin; Fries, Jiří; Hrabovský, Leopold; Slíva, Aleš; Žarnovský, Jozef

doi:10.2478/mspe-2020-0008

Cited by 18 publications

(17 citation statements)

References 9 publications

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“…One of the device variant [2,3,4,5,7,9] is, at the moment the tensile force in the rope needs to be recorded, placed in a space where the rope is attached using suspension bolt [2,3] to console [6], built-in in the elevator shaft of the given traction elevator or attached to the frame of the given elevator cage [9, 16,18,22]. One of the several [3,10,17] structural designs of the hydraulic rope equalizers is presented in [9].…”

Section: Literature Reviewmentioning

confidence: 99%

Laboratory Device for Checking the Functionality of the Elevator Rope Sensors

Hrabovský

Borovsky²

2020

Management Systems in Production Engineering

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The paper describes the structural design of a laboratory device that allows for presenting operation, simulating work procedures and checking functionality of the elevator “rope sensors” when equalizing different tensile forces in partial ropes of a rope system of traction elevators. The laboratory device is modified for checking operations of commonly used rope sensors. In an overwhelming number of cases, elevator technicians use them for setting up the unequally distributed tensile forces in elevator ropes. The device is equipped with three, mutually attached pulleys, over which the rope is installed. The unknown tensile force in the rope is determined by an “indirect method”, i.e. from the resultant of the forces of the rope bent over the pulleys, which have an effect on the force sensor. The tensile force along the rope axis can be determined numerically, but also experimentally, from the inclination angle of the rope installed on the pulleys, diameter of the pulleys, diameter of the rope and the force detected by the force sensor of the stretched rope. The paper presents experimentally obtained tensile force values at the rope sensor, deduced from stretching the rope. The paper also describes the procedure for determining the measured load in the rope by rope sensors of the SWR, SWK and RMT-1 types based on the variable axial force in the rope.

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Section: Literature Reviewmentioning

confidence: 99%

Laboratory Device for Checking the Functionality of the Elevator Rope Sensors

Hrabovský

Borovsky²

2020

Management Systems in Production Engineering

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“…in section 4.2 of the auger dewaterer, can be expressed as the volume of a hollow vertical cone with an outer diameter d t1 [m] (the initial inner diameter of the trough with a circular cross-section) and an outer diameter d t5 [m], which is the inner diameter of the trough with a circular cross-section at the end of section 4.2 of the auger dewaterer, according to relationship (6). 2 2 t4 t4 t5 t5 m42…”

Section: Theoretical Calculation Of the Volume Of Bulk Materials In Inmentioning

confidence: 99%

“…Due to the centrifugal force, the melt droplets turn into fine fibers on rotating rollers (pulping wheels) in the blowing air stream. Cooler droplets of liquid melt can no longer stretch and fly off the disks as tiny grains [2] (so-called granules).…”

Section: Introductionmentioning

confidence: 99%

Gravitation Auger Water Separator from a Suspension of Wet Bulk Material

Hrabovský¹,

Durna²,

Fries³

et al. 2020

Adv. Sci. Technol. Res. J.

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The paper deals with the problem of water separation from a mixture of wet loose material using a worm, or auger, dewaterer, whose working element is a full auger with variable thread pitch, rotating in a fixed trough. The extrusion of water from the wet material suspension, consisting of a mixture of mineral wool tufts and granules, is effected in the auger dewaterer by entraining and compressing the wet bulk material through the threads, the varied pitch of the conical screw, and the rotation of the auger.The thread faces and thread edges of an improperly designed screw of the auger dewaterer by Advanced Metal Powders s.r.o. showed notable wear from the applied pressure of the packed wet bulk material (passing through the threads of the different pitch of the conical auger). Finding the cause of the severe abrasion and preventing excessive further wear of the auger was the subject of theoretical calculations and experimental verification tests, whose main conclusions are presented in this paper. The paper gives the relations that allow calculation of the volume of bulk material in individual sections of the auger dewaterer. The calculated values from these relationships, were verified and compared with the values read from the 3D CAD system for designing SolidWorks Premium 2012 SP 5.0 models.The percentage compression values of the loose material in the threads of differential pitch of the conical auger of the unsuitably designed auger-screw dewaterer by Advanced Metal Powders s.r.o. allowed us to define recommendations that, applied, would ensure malfunction-free operation of the auger-screw dewaterer.

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“…Due to the centrifugal forces [10], porosity and impurities (if any) occur only at the casting inner surface (to be removed during consequent finishing). The manufacturing process of centrifugal castings is as follows: in a centrifugal casting the melted metal is poured into a fast rotating metal mould [2,4]. When poured, the metal is forced by the centrifugal force against the mould walls [3].…”

Section: Introductionmentioning

confidence: 99%

A Centering Technique for Cast-Iron Moulds in Horizontal Centrifugal Casting

Hrabovský¹,

Mašlonka²,

Kubín³

et al. 2021

Adv. Sci. Technol. Res. J.

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In this paper, a technique of axial centering of cast-iron moulds, e.g. the so-called "rail system" as suggested by KonCAD CZ s.r.o. for the application of horizontal centrifugal metal casting process, was described, evaluated, and finally not recommended for practical use. The proposed principle of the axial centering technique is based on the fact that two rings with the external shape similar to the shape of the Vignole (flat-bottomed) rail are welded on the cast-iron mould external perimeter, perpendicularly to the cast-iron longitudinal centreline. The cast-iron moulds are supported by two pairs of opposite conic rollers. The cast-iron mould is driven by a contact power transmission, i.e. by the friction method employing a pair of conical rollers and acting over the welded rings to the cast-iron mould. The circumferential force transfer is carried out by the friction between the cast-iron mould rings and the two driving rollers. Both driving and driven rollers have similar shapes, analogous to a tyred wheel profile. The two driving rollers are tightly fit on the common drive shaft, the centreline of which runs in parallel with the cast-iron mould longitudinal centreline. The necessity of creating of a sufficient thrust force of the cast-iron mould against the rollers causes wear conditions at the rounding of external shapes of rings, bearings, as well as roller contact conic surfaces.

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Research and Development of Laser Engraving and Material Cutting Machine from 3D Printer

Cited by 18 publications

References 9 publications

Laboratory Device for Checking the Functionality of the Elevator Rope Sensors

Laboratory Device for Checking the Functionality of the Elevator Rope Sensors

Gravitation Auger Water Separator from a Suspension of Wet Bulk Material

A Centering Technique for Cast-Iron Moulds in Horizontal Centrifugal Casting

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