Frequently Asked Questi̇ons
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Frequently Asked Questi̇ons
Necessary answers to frequently asked questions about our company are presented below for your information;
How Can We Install Selkas Elevator Speed Regulator Tension Pulley?
After our product is connected to the rail and the strut is aligned, there is a slot under the strut to fix the strut. Rope adjustments can be made after this slot is fixed with a bolt or similar. After the rope adjustments are made, the fixing metal must be taken out of the slot again. You can watch our assembly video from the link below.
How is the Maintenance of Closed Type Bearing Used in Pulley?
Due to some factors (construction dust, water and humidity accumulated in the elevator shaft, etc.) in the bearings, accumulations such as dirt, dust and rust may occur after a while. Dirt inside the bearing often causes an annoying noise. A severely damaged bearing will produce an irregular and loud noise. However, corroded bearing covers produce a regular and uniformly solid sound. At this stage, we must first use a rust remover in order to clean the inside of the bearing and remove the rust. There are chemicals that only allow the rust to be completely removed without damaging the bearing. This type of application can be made especially in closed type bearings. After the rust remover application, the elevator is operated for 7 to 8 turns. It is operated at revision speed for the first 3-4 laps, and at normal cruising speed for the next laps. The purpose of this is to completely remove the dirt and rust inside as a result of the movement of the bearing during travel. Afterwards, we can lubricate our bearings with the application of LIQUID GREASE. The duty of the lubricant; reducing friction, preventing wear and corrosion, lowering the operating temperature and protecting the bearing against both solid and liquid dirt. The first thing to do in a bearing to be lubricated is to clean its surroundings. The grease to be used for relubrication should be as clean as the original grease. Immediately afterwards, the cleaned bearing must be lubricated with a suitable liquid grease (it is important to choose the correct grease for bearing application and apply the correct amount before commissioning the bearing.). While greasing is being done, the bearing should be rotated so that the grease is spread well on the raceway (between the two covers). It is expected to have an immediate effect as a result of cleaning. There should be no irregularities and noise, no roughness should be felt. If desired, the bearing is then measured and checked to examine its condition and whether it can be reused. It should be checked whether the situation recurs in the next process. If the noise continues to come from the bearing after two or three applications in different periods, the bearings should be replaced.
Is Polyurethane Buffer Used In Elevators Above 1.00 m/s Speed And Why Should A Hydraulic Buffer Be Used?
The use of polyurethane buffers above 1 m/sec speed is prohibited as a regulation, you can find detailed explanation on the subject below; Buffer is a system established to prevent the car from hitting the ground hard in case the car cannot stop while the elevator is descending. The buffer strength should be designed considering that the speed rated speed will be at max. 115% during hard impact. Bumpers can be used as polyurethane, spring and hydraulic. Buffers (spring and polyurethane) that store energy up to 1 m/s speed are used. Energy storage buffers cannot provide sufficient energy absorption at speeds higher than 1 m/s. Energy-accumulating type buffers can only be used in cases where the rated speed of the elevator does not exceed 1 m/s (TS EN 81-20 Article 5.8.1.5). Therefore, hydraulic buffers that dissipate energy should be used in elevators operating at speeds higher than 1 m/s and in high-rise buildings. Energy dissipating type buffers can be used at all rated speeds (TS EN 81-20 Article 5.8.1.6). It uses the load energy that can come on the hydraulic buffers to stop the elevator at the desired acceleration and distance. It converts the energy of impact into heat energy and provides energy distribution. Hydraulic buffers must meet the requirements of TS EN 81-20 and TS EN 81-50 standards. The total possible stroke of the energy-dissipating type buffers must be at least equal to the weight stopping distance, which corresponds to 115% of the rated speed. (TS EN 81-20 Article 5.8.2.2.1) Requirements to be fulfilled (according to TS EN 81-20 Article 5.8.2.2.3); While the car is falling, the max. It is predicted that it will drop by 115%, so the average braking acceleration should be less than 1g when the cabin hits the bumper. (TS EN 81-20 Article 5.8.2.2.2) If the braking acceleration is greater than 2.5g, its duration should not exceed 0.04 seconds. (Braking acceleration greater than 3g endanger human health.) When the car is lifted from the bumper after the impact, it should return to its original state and there should be no permanent deformation. If a load falls on the bumper, the switch disables the elevator's electrical system. When the cabin is seated on the bumper or the counterweight is seated on the bumper, pressure occurs on the piston and the oil in the cylinder is transferred to the outer cylinder. When the pressure on the bumper is removed, the switch turns the electrical system back on.