Page 82 - LIFT VISION 39 IÇ SAYFA

SAFETY DEVICES

moment, is pulled and braking takes place.
On the one hand, the electric safety contact
on the brake device cuts the electricity of the
elevator drive system and stops the elevator
machine, on the other hand, the sliding brake
system compresses the guide rails and clam-
ps them to the rails by sliding the elevator a
little.

Acceleration is the amount of speed that
changes over time. To ensure the safety of
life and property, braking acceleration should
be between 0.2.gn and 1.gn. Ideally, the bra-
ke should be activated with an average acce-
leration of 0.6.gn. Here gn is the acceleration
of gravity, which is 9.81 m/s². Braking with
high acceleration means that the car stops in Figure 1: Zorlu
a short distance. For example, if an elevator Z06-3
brakes with a braking acceleration of 1.gn, Sliding Brake System
there will be a relatively hard stop as the sli-
ding distance will be short. If the accelerati-
on increases further, there is a great risk for elevator loaded with 125% of the rated load bers, during braking. The ability of the ma-
children, the elderly, the sick and pregnant and, for example, 1 m / s rated speed, accor- terials to recover after flexing without losing
women due to sudden braking. If the braking ding to the triggering of the speed regulator, their properties allows that brake to repeat
acceleration is less than 0.2.g gn, the sliding according to the 6.3.4 article of the TS EN its function over and over again. Brakes de-
distance will be very long. For this reason, 81-20 standard, is calculated according to the signed and manufactured in this way can be
the legislation stipulates a braking accelera- formula on the side. restored without external intervention in the
tion between 0.2 and 1 times the accelerati- cabin. In order to remove a braked elevator
on of gravity to ensure the safety of elevator After the safety device test, the cab is mo- from the brake, it should be sufficient to give
users. ved to a position where the tracks on the rail a reverse command to the elevator in revision
can be measured. The length and width of the mode. In this way, the brake should automati-
Brake Tests in Registration Inspections: track on the rails are measured. It is checked cally return to its pre-test settings and the car
In the full load braking test, not only the bra- that the brake marks on both rails are equal and its carcass, which are stuck between the
king system is tested; together with the bra- and grip the rail. It is observed that there is rails, should be freed from the rails. After the
king system, rails, console connections, even no distortion and distortion in the cabin. Ac- safety device is released, the elevator should
the conformity of the machine frame assemb- cording to the result of the load test, when not be in service immediately; it should only
ly is also checked before the elevator is put an elevator with a declared speed of 1 m/s be put into operation after the intervention of
into service, which, as an engineer, I think switches to the brake, if it is determined that competent maintenance personnel.
is the best practice. How much the elevator the brake slides at least 5 cm and at most 25,5
should slide in the brake tests of the regist- cm, conformity is given. On the other hand, Each brake block that makes up the brake
ration examinations has often been a subject the distance traveled during the reaction time set is connected to each other by means of
of discussion. The calculation table below -as of the speed governor and the distance trave- a transfer )synchronization( rod. This conne-
I have detailed in the reference section- is a led during the closing of the opening between cting rod helps the brake blocks to activate
summary of an official letter of the Ministry the clutch elements and the guide rail must be simultaneously. I think it is essential that this
of Industry and Technology in response to a added to the braking distance. connecting pipe is supplied by the manufac-
question asked on the subject. turer and shipped to the site mounted on the
Increasing the sliding distance means redu- car carcass in order to transmit the movement
In the registration inspections of elevators cing the energy used on the brake shoe, and between the two brake blocks completely and
installed in accordance with the 2014 / 33 / this is only possible by flexing certain mate- not to cause any delay in the movement. In
EU Regulation, the braking distance of an rials in the brake body, such as shock absor- addition, this will relieve the assembly com-

82 LIFTVISION
4th QUARTER 2023