Apparatus Producing an Even Distribution of Strain into Carries

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The contribution deals with a device, which allows recording values of tensile forces acting on steel ropes. At the same time, this device allows setting of the same values of tensile forces in carrier ropes within multi-rope systems, which are initially unevenly subjected to tension by the action of the weight suspended on these ropes. In the contribution, two principles of devices for setting the required value of tensile force in ropes are mentioned and subjected to the analysis of practical applicability. The paper describes in detail the design and principle of operation of the mechanical device for setting the required value of tensile force in ropes, which uses screw drive and tensile force sensor.

Section: Discussionmentioning

confidence: 99%

“…[4], measuring the tensile force in the rope using the principle of bending deformation of the beam loaded with single force, see Figure 1. This device uses bodies with a measuring member and three contact points in a plane.…”

Section: Existing Principles Of Devices Capable Of Detecting Tensile mentioning

confidence: 99%

Device Designed for Detection and Setting the Required Tensile Force in Ropes

Hrabovský¹,

Maslarić²

2018

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“…The device makes it possible to attach one or the other design to a special bracket (not described in more detail in this paper) of the pallet locking brake, which is then allowed to move vertically thanks to the rotation of the screw of the screw spindle [4], the nut of which is attached to the vertical beams of the frame structure. The pressure force F x(l) [N] generated by the rotating screw of the screw spindle is detected by the tensometric force sensor and its progress over time (during the rolling of the bearings of the locking brake along the selected brake track) is recorded by the measuring apparatus.…”

Section: Device For Testing the Pallet Locking Brake Systemmentioning

confidence: 99%

Forces Generated in the Parking Brake of the Pallet Locking System

Hrabovský¹

2019

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Automatic parking systems are parking structures with a computer-controlled automated vehicle loading and unloading process using sophisticated technological equipment. The paper describes a construction design for a pallet locking system, which is used to lock parking pallets with or without a vehicle, at a particular location and floor, that is, in a rack cell. This is one of the basic design concept variants of "Multi-Tower" automatic parking systems. This concept makes it possible to store cars stacked in rack cells. Cars on pallets are guided to the vertical cells of the parking system, stacked above each other on pallets, by an electric freight traction elevator. Pallets are stacked into the horizontal cells, on either or both sides, on a given floor of the parking system by means of a chain transfer device. After the pallet has been guided to a particular position, the pallet must be fixed in this position by the pallet locking system so that when the vehicle needs to be retrieved, the chain transfer device can again latch onto it and move it to the traction lift cage without any problems. The locking system also functions as a brake for the pallet carrying the parked vehicle. The paper also presents the theoretical calculations of the pallet brake, which is a crucial element of the pallet locking system of the conceptual variant of the "MULTI TOWER" automatic parking system.

“…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%

Tensile Forces in Lift Carrier Ropes Exerted by the Fluid Pressure

Hrabovský¹

2019

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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.