A Tension Equalizer in Lift Carrying Ropes

Hrabovský, Leopold; Michalík, Peter

doi:10.12913/22998624/80936

Cited by 10 publications

(14 citation statements)

References 9 publications

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“…In Table 3 in the first two columns, there are stated the H o [m] and H k [m] positions, taken from the console display in the winder engine room where both transport vessels were located at the moment of the beginning of the experimental measuring [7]. From the data files (saved in the PC memory in the partial experimental measuring L1 and L12), the time t 1 [s] (the time at which the transport vessels have just begun to move) and the time t Table 3).…”

Section: Evaluation Of Experimental Testsmentioning

confidence: 99%

Determination of mining equipment motion resistance

Hrabovský

Janek²

2019

MATEC Web Conf.

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The article presents the experimental measurement of the mining equipment motion resistance in the Mining Plant 1, the Lazy mine location district. The procedure of the experimental tests was as follows, one of the transport vessels was fitted with a weight of a known weight. The mining cage was loaded with the weight and pulled up in the traffic pit to the required depth, then the mining equipment was released and, using the IRC rotation speed sensor attached to the rope drum shaft, the travelled trajectory and the instantaneous mining cage speed were recorded with an indirect method. Upon reaching the speed of the transport vessels, a maximum of 3.15 m/s, the vessels were equipped with the mining equipment brakes and the transport vessels were slowed down to zero speed. From the recorded data in the PC memory, ie initial positions of both transport vessels, travelled trajectory and instantaneous speed values, the values were consequently calculated and added to the stated tables.

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Section: Evaluation Of Experimental Testsmentioning

confidence: 99%

Determination of mining equipment motion resistance

Hrabovský

Janek²

2019

MATEC Web Conf.

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“…Several papers have been devoted to the issue, as well as to possible solutions of how to equalize different values of tensile forces in lift carrier ropes [1,2,3]. These papers described structural solutions and principles of device, the so-called mechanical rope tension compensators which allow to detect instantaneous values of tensile forces in individual cross-sections of carrier ropes of traction rope lifts and to adjust any possibly different tensile forces to the same value.…”

Section: Introductionmentioning

confidence: 99%

“…These papers described structural solutions and principles of device, the so-called mechanical rope tension compensators which allow to detect instantaneous values of tensile forces in individual cross-sections of carrier ropes of traction rope lifts and to adjust any possibly different tensile forces to the same value. These devices use strain gauge load cells [3] or foil strain gauges [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…The tensile force, exerted by the weight of the cage and the maximum weights of the load, affecting the carrier ropes of traction lifts must be evenly distributed over all cross-sections of the ropes. The tensile force can be evenly distributed across all cross-sections of the ropes using one of the variants of rope mechanical tension compensators [1,2,3], rope sensors [4] or rope hydraulic tension compensator [5].…”

Section: Introductionmentioning

confidence: 99%

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Tensile Forces in Lift Carrier Ropes Exerted by the Fluid Pressure

Hrabovský¹

2019

Adv. Sci. Technol. Res. J.

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This paper describes the methodology by which it is possible to compare different tensile forces that are caused by the uneven distribution of loads in carrier ropes of lifts. In order to compare the applied tensile forces in a certain number of carrier ropes, it is possible to use the device called "rope hydraulic tension compensator", when, for example, building new elevators, changing carrier ropes during renovations or servicing existing lifts. The comparison of tensile forces in lift carrier ropes by the described device is based on the method of liquid pressure diffusion in a closed vessel. The rope hydraulic tension compensator consists of a number of structural parts, the main of which are double-acting hydraulic cylinders. The number of these cylinders is equal to the number of carrier ropes of the given lift. The pressure of the hydraulic fluid, which is supplied to the inner shell of individual hydraulic cylinders, controls the length of extension of individual piston rods of the hydraulic cylinders. The position of the piston in each of the hydraulic cylinders is directly proportional to the length of the extended piston rod, which corresponds to compression of the cylindrical coiled spring, above which the respective hydraulic cylinder is located. Different compressions of individual cylindrical springs exert different magnitude of tensile forces in suspension eye-bolts, into whose longitudinal axes the total load size is distributed unevenly. The paper also describes the description and hydraulic circuit diagram of a hydraulic power unit, which is used to control the piston positions of two-way hydraulic cylinders.

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“…Steel ropes are complex flexible structures used in many technical applications, such as elevators [1], cranes [2,3], marine applications [4], cable ways and hoisting mine applications [5]. In many high-rise residential buildings or multi-storey warehouses, machinery, so called lifts, are used for the vertical transportation of people or weights between at titudinally distant places [6].…”

Section: Introductionmentioning

confidence: 99%

The Causes of the Damage to the Bearing Rope – The Failureanalysis

Peterka¹,

Krešák²

2018

Adv. Sci. Technol. Res. J.

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In our laboratory we quite often experience problems with the operation of steel ropes. There is a range of causes related to lifetime problems of ropes. These problems are related to poor quality of input material used for wire production, mixing of different wire strengths in the rope construction, improper roping of the rope into the hoist system, improper rope operation, improper rope design for a particular type of operation as well as unfair practices of vendors. The subject of the article is the analysis of the rope showing the combination of a large number of the above factors leading to the damage of the rope. During the operation of the cargo cableway, the hauling ropes were damaged in a very short time. The Z wires from the surface layer of the rope started to release from the rope. Subsequently, the wires were unwinding from the layer, they created visible protuberant waves, they were braking and dropping out from the rope. The hauling rope had to be replaced. Than the samples were taken from the rope in order to find out the cause of the rope damage. Mechanical, metallographic and fractographic measurements were performed on the rope. The metallographic and fractographic measurements revealed the material defects of the wires of the rope caused during manufacturing of the Z wires from the surface layer of the hauling rope. The mechanical tests revealed differences in the tensile strength grade the operator required compering to the tensile strength grade the vendor declared. The above mentioned problems unambiguously show that it is appropriate to introduce a mechanical control of the rope properties in advance to its deployment. Checks must be performed by an independent testing laboratory. This procedure overprices inputs needed for the rope replacement. On the other hand, it can reduce the costs when a poor quality rope is deployed. Some of our customers have already adopted this approach. It helped to the increase in the safety of the operation of the mechanisms and it eliminated the problems with exchange and climes on bad quality ropes.

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A Tension Equalizer in Lift Carrying Ropes

Cited by 10 publications

References 9 publications

Determination of mining equipment motion resistance

Determination of mining equipment motion resistance

Tensile Forces in Lift Carrier Ropes Exerted by the Fluid Pressure

The Causes of the Damage to the Bearing Rope – The Failureanalysis

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