Parking Lot Gates Smash People and Cars Frequently. Tigerwong Corrects the Name of the Sense of the

[tigerwong express] according to Hohhot evening news, Ms. Li, who lives in Yuquan District, has been pregnant for more than two months. A few days ago, when Ms. Li rode an electric motorcycle through a parking lot in Yuquan District, the parking brake rod suddenly landed and hit her on the head. Ms. Li fell on the spot, resulting in miscarriage. According to Ms. Li, at noon that day, when she was going to enter a parking lot in Yuquan District by electric car, she saw that the non motorized Lane next to her was very narrow. At that time, the road gate lever of the parking lot was open, so Ms. Li entered the parking lot by electric car.

To her surprise, as soon as she got to the entrance of the parking lot, the road gate rod was put down and hit her in the head. Tragedy happened. When it comes to smashing cars and people at the gate of the parking lot, many customers often judge the vehicle detector / ground sense as the culprit, so the ground sense is to blame as soon as the gate smashes the car. Most people think that the ground sense has the function of anti smashing, and that the smashing is caused by ground sense crash, quality problem or damage. It's not! Tigerwong technology, with its 14 years of experience in specializing in the production of card machines, ground sense (vehicle inspection) and other parking accessories and systems, believes that the reason for the gate smashing is that the embedding of the detection coil is not standardized! Today we will correct our name for the sense of earth! Many users do not know that the ground sense is actually a switch. When a metal object moves on the detection coil, the inductance of the coil will change, resulting in the change of oscillation frequency; Judge whether there is a vehicle passing by by detecting the change of oscillation frequency, and finally control the relay to close and open within the designed time.

The ground induction work must be transmitted by the detection coil. It just plays a leading role. It is just a switch, which is only closed or disconnected within the designed time. Then the reason why the road gate rod smashed the car is basically clear. Basically, the road gate pole smashing is caused by the detection coil, and the detection coil is buried by people, so in the final analysis, it is a man-made disaster.

So, what problems should be paid attention to in the embedding process of detection coil? Tigerwong believes that the coil embedding should comply with the following specifications: whether the detector can work well depends largely on the induction coil to which it is connected. Several important parameters of the coil include: coil material, coil shape and size, number of turns (inductance) and whether it is correctly buried. During installation, the following matters must be paid attention to: 1. Coil crosstalk when the two induction coils are close together, the magnetic fields of the two coils are superimposed to cause interference with each other. This phenomenon is crosstalk. Crosstalk can lead to incorrect detection results and deadlock of loop detector. In order to eliminate crosstalk between adjacent coils belonging to different inductors, the following measures can be taken: 1. Select different working frequencies. 2. Change the number of turns of adjacent coils and increase the spacing.

It must be ensured that the spacing between detection coils is greater than about 1m; 3. The lead out of the coil shall be well shielded, and the shielded wire must be grounded at the detector end. Multi strand copper conductors are preferred for coil cables and joints. It is better not to have a connection between the cable and the connector. If terminals are necessary, ensure reliable connection, weld them with soldering iron and place them in a waterproof place. II. Coil material under ideal conditions (without considering the influence of all environmental factors), the embedding of inductance coil only considers the size (or perimeter) and number of turns, and the material of conductor can not be considered.

However, in practical engineering, the mechanical strength and high temperature and anti-aging problems of wire conductors must be considered. In some harsh environments, acid-base corrosion must also be considered. Once the conductor is aged or the tensile strength is not enough to lead to the conductor damage, the detector will not work normally. In the actual project, it is recommended to use teflon high-temperature silver plated copper flexible conductor with a cross-sectional area of more than 1.0mm or multi strand double-layer waterproof copper wire with a national standard cross-sectional area of no less than 1.0-1.5mm2. III. coil shape: the width of the coil (the forward direction of the vehicle is the width of the coil) determines the coil detection height (the high bottom of the vehicle chassis); That is, the coil detection height is 1 / 2 of the coil width. Therefore: the size of vehicles passing through different ground feeling working environments; The shape and size of the buried coil are different.

The coil shall be buried according to the size of passing vehicles on the road. IV. coil turns: in order to make the detector work in the best condition, the inductance of the coil shall be kept at 100uh & shy- Between 300uh. When the coil inductance is constant, the number of turns of the coil has an important relationship with the circumference. The smaller the perimeter, the more turns. Generally, refer to the following table: since various cable pipelines, steel bars, sewer covers and other metal substances may be buried under the road, these will have a great impact on the actual inductance value of the coil, so the data in the above table are only for users' reference.

During actual construction, the user shall use the inductance tester to actually test the inductance value of the inductance coil to determine the actual number of turns during construction, as long as the final inductance value of the coil is within a reasonable working range (such as between 100uh300uh). V. when winding the coil, the output lead shall be left with a sufficient length of wire to connect to the loop inductor, and ensure that there is no joint in the middle. After winding the coil cable, the outgoing cable must be made into tight twisted pair, and it is required to be twisted for 20 times at least 1 meter. Otherwise, the output lead without twisted pair will introduce dry closing, which will make the coil inductance unstable. Generally, the length of output lead shall not exceed 5m. Since the sensitivity of the detection coil decreases with the increase of the lead length, the length of the lead cable should be as short as possible. Vi. embedding method: for coil embedding, first use a road cutter to cut a groove on the road.

Chamfer the four corners 45 degrees to prevent sharp corners from damaging the coil cable. The groove width is generally 4 to 8 mm and the depth is 30 to 50 mm. At the same time, cut a slot for the coil lead to the roadside. However, it should be noted that the groove must be clean and free of water or other liquid infiltration. When winding the coil, the coil must be straightened, but not too tight and close to the groove bottom.After winding the coil, lead out the twisted output lead through the outgoing slot. During the winding process of the coil, the inductance value of the inductance coil shall be actually tested by the inductance tester, and the inductance value of the coil shall be between 100uh300uh. Otherwise, the number of turns of the coil shall be adjusted. After the coil is buried, in order to strengthen protection, a circle of nylon rope can be wound around the coil. Finally, seal the cutting groove with asphalt or soft resin.