If you want to make 25%, 50%, 100%, 125%, 1000KG ladders, 50% of the ladders are 500KG, and 50KG is 500/50= 10.
For example, the elevator model TKJ800 &; #47; 1.75-rated load of VVVF is 800kg, rated speed1.75m &; #47; S frequency conversion transformer passenger elevator! If it is known that the car mass is 1000kg when the car is empty, the total mass of the counterweight (refer to the following formula): w = p+kq =1000+0.45 * 800 =1360kg!
In this way, by estimating the mass of the counterweight frame, you can get the number of counterweight blocks needed for elevator installation (here you must know the mass of each counterweight block).
Mathematically speaking, the balance coefficient of elevator can actually be understood as the proportion percentage of counterweight and car.
From the formula: W=P+kQ(k represents the value of the balance coefficient, which is 0.45-0.55 for general freight elevators and 0.4-0.5 for passenger elevators).
To understand its meaning:
In the formula, symbol W represents the total counterweight weight including counterweight frame and counterweight block;
Symbol p represents the weight of the car when the elevator is empty (including some car side cables and wire ropes);
The symbol q represents the rated load weight of the elevator.
In short, as mentioned above, the elevator balance coefficient K is a parameter constant used to determine the total weight of the counterweight, similar to the local gravity acceleration G (9.8m &: #47; Square of seconds)
Elevator drive modes include traction drive, forced drive and hydraulic drive. Traction drive is the most commonly used drive mode in modern elevators. The car and counterweight of the traction elevator are suspended on both sides of the traction sheave by steel ropes respectively, and the traction steel rope is tightly pressed in the rope groove of the traction sheave by the gravity of the car and counterweight device.
When the motor rotates, due to the friction of the rope groove of the traction sheave, the steel rope is driven to make the car move relatively counterweight, and the car runs up and down along the guide rail in the hoistway. Balance coefficient is an important performance index of traction drive elevator. The counterweight can partially balance the weight of the car and the load in the car, thus reducing the load of the traction motor.
Because the load in the car is constantly changing, and the counterweight has been fixed after the installation and debugging of the elevator, it cannot be changed at any time. In order to make the operation of the elevator basically close to the ideal balance state, it is necessary to choose an appropriate balance coefficient.
Definition: k = (w–p)/qh
Where: p is the weight of the car;
W- is the weight of the counterweight;
Qh- the rated load of the car.
This coefficient k is the "equilibrium coefficient".
Standard: Article 3.3.8 of the national standard gb/t 10058- 1997 "Technical Conditions of Elevator" stipulates that the balance coefficient of traction elevator should be in the range of 0.4 ~ 0.5.
Balance coefficient Baidu encyclopedia