The seventh solution to the problem that the flap garage door \”won\’t close\”

The seventh solution to the problem that the flip garage door cannot be closed

The larger the wire disc, the smaller the lifting force of the torsion spring.

The same torsion spring, the wire coil is more The larger the torsion spring is, the smaller the output lifting force of the torsion spring will be. Two coaxial steel wire discs, No. 9 flat wheel wire disc, effective diameter is about 105mm, when the torsion spring output lifting force is 60kg. The No. 18 flat wheel wire disc has an effective diameter of about 140mm and a lifting force of only 46.2kg.

Flip doors of the same size, equipped with No. 9 steel wire reels and No. 18 steel wire reels What\’s the difference?

The effective diameter of the No. 9 steel wire disc is about 105mm, and the torsion spring output lifting force is 60kg.

The effective diameter of the No. 18 steel wire disc is about 140mm, and the torsion spring output lifting force is 46kg.

Every time a door panel is opened upward in the flap door, the weight of the top door panel will be transferred to the horizontal curved rail. The torsion force of the torsion spring will continue to be released, driving the steel wire disk to continue to rotate. The disc is tightened by winding, thereby driving the movable door panel to continue to operate.

No matter where the movable door panel moves, the steel rope is always in a tight state.

During the operation of the movable door panel, the parameter value between the wire disc size and the torsion spring force can be calculated.

For example, the attenuation coefficient of the No. 18 flat wheel compared to the No. 9 flat wheel is 46÷60≈0.76.

This coefficient is approximately equal to the ratio of the diameter of the wire disc, that is, 105÷140=0.75.

In practical applications, due to the size of the door opening, opening height, and door panel material of each garage door , motor models, etc. cannot be unified, so manufacturers require accurate measurement. Even though customers have already placed orders, manufacturers still need to arrange professional staff to come to review the dimensions before proceeding with production and installation.

Take a 7-square-meter flip garage door as an example. The door is 3 meters wide and the opening height is about 2.3 meters. It is made of steel plate. With tracks, wheels and hardware accessories, the entire garage door weighs about 60 kilograms. , Kunming Haydn garage door uses No. 9 steel wire disc with a diameter of 105 mm. According to the calculation formula of the circumference of a circle = pi

The running distance of the movable door panel is about 33 centimeters for each revolution of the steel wire on the wire drum. Excluding the force that requires pre-tightening, the distance for the steel rope to be wound around the wire drum for 7 turns is: 33 Centimeter x 7 circles ≈ 2.3 meters.

The running distance of the movable door panel is exactly 2.3 meters of the steel rope wrapped around the steel wire reel, which is equal to the distance between the door panel from the ground to the bottom of the door opening height.

Let’s talk about the parameters of the torsion spring. The torsion spring corresponding to the No. 9 steel wire plate has a diameter of 6.0, a length of 800 mm, and a lifting force of about 60 kg.

If you follow the torsion spring force calculation formula of the flip garage door that has been shared many times before = door opening height + 13 times, Taking the door opening height of 2.3 meters as an example, the number of times of torsion spring force =23+13=36 times

The force of the torsion spring comes from the two holes on one side of the torsion spring. The distance between these two holes is about 7.5 cm. By turning these two holes, the torsion spring can be compressed. Moreover, this force can also be calculated by the length of the steel rope.

Torsion spring When the reinforcing hole on the machine is turned up and down and rotated once from bottom to top, the winding distance of the steel rope on the torsion spring-driven steel wire reel is 7.5 cm, 36 times X 7.5 cm = 2.7 meters.

2.7 meters compared to the actual opening height of 2.3 meters, why is there 40 centimeters more?

This is the shape of the wire rope whether it is opening or closing the doorIt must be in a tight state, so it is necessary to wrap one or even two more turns on the steel wire disc. This is called torsion spring preload. The purpose is to keep the wire rope from loosening.

If the wire rope is slightly loose, the door It will go astray. If the wire rope is too loose or completely scattered, it means that the lifting force of the torsion spring is gone.

The torsion spring is weak. I want to use the motor to straighten the loose steel rope and then pull the door up. I advise everyone not to try it. Everyone who has tried it regrets it.

If the steel rope is loose and the torsion spring is weak, the motor will not only be unable to pull the door panel, but fortunately the motor will idle and the door will not move. Unfortunately, the motor may explode.

So, I found the seventh reason why the flip garage door \”won\’t close\”.

Some people in the industry also pointed out that the torsion spring force calculation formula = Door opening height ÷ Wire plate circumference. If the result is an integer, add one more circle. If there is a remainder, add two more circles.

Taking the door opening height of 2.3 meters as an example, divided by the circumference of the No. 9 steel wire plate flat wheel of 33 centimeters, the result is about 6.96. If calculated based on 7 turns, add one turn of preload force, which is 8 turns. The distance between the two holes is 7.5 cm. One turn = 7.5 cm =32 times.

This answer is the same as the door opening height 23+13 =36 times is very close.

Similarly, I can also infer the origin of the parameter \”13\”.

Open the door withThe number obtained by dividing the height by the circumference of the flat wheel is an integer. Add one circle of preload. The resulting number will have a remainder and the remainder shall be rounded off. If it is greater than 5, add 2 circles. If it is less than 5, add 3 circles. Regardless of whether it is one circle. Two turns or three turns, the more preload force the better, take the maximum value, 3 turns of preload X 4 times = 12 times, 13 times is not an exaggeration at all.

During the repair work of flip garage doors, some netizens are confused about the difference between garage door spare parts and will randomly order a pair of steel wire discs or a torsion spring online, and then they will find that they cannot be installed or the torsion spring cannot be installed. Due to problems such as strength mismatch, even if the merchant supports 7-day no-reason returns and exchanges, time and freight are wasted. The freight for a torsion spring sent by SF Express across provinces is about 100 yuan.

There is another detail that needs to be paid attention to. If non-professionals add force to the torsion spring by themselves at home, in addition to referring to the calculation formula just mentioned, they must also remember to bite the balance rod of the torsion spring with powerful pliers. Then you will find that it is easy to apply force the first few times, but after ten to twenty times, you will find that the crowbar becomes increasingly unable to be lifted. This just shows that your torsion spring adding force method is correct.

The garage door maintenance skills I talked about above, whether it is a No. 9 steel wire disc or a No. 18 steel wire disc, are flat wheels, so you can refer to these calculation formulas.

If it is a half flat wheel + a half conical wheel, or Parameter values ​​such as the cone wheel, the corresponding wire disc size and torsion spring configuration, as well as the torsion spring force calculation formula of the industrial lifting door need to be separately evaluated based on the door opening size of the project.