Installation of ground induction coils of barriers and points for attention

更新: 2021/02/20
摘要:

In order for the vehicle detector of the barrier gate t […]

In order for the vehicle detector of the barrier gate to work in the optimal state, the installation of the ground induction coil is extremely important. Let's take a look at the installation of the barrier gate ground induction coil. In order to make the detector work in the optimal state, the inductance of the coil should be Keep it between 100uH-300uH. When the inductance of the coil remains unchanged, the number of turns of the coil has an important relationship with the circumference. The smaller the circumference, the more turns. As there may be various cable pipelines, steel bars, sewer covers and other metal materials buried under the road, these will have a great impact on the actual inductance value of the coil, so the user should use the inductance tester to actually test the inductance value of the inductance coil during actual construction. To determine the actual number of turns for construction, as long as the final inductance value of the coil is within a reasonable working range (for example, between 100uH-300uH).
When winding the coil, leave a wire of sufficient length to connect to the loop inductor, and ensure that there is no joint in the middle. After the coil cable is wound, the lead cable must be made into a tightly twisted form. The requirement is less than 1 M twisted 20 times; otherwise, the untwisted output leads will introduce interference and make the coil inductance unstable. The output lead length should generally not exceed 5 meters. 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.
For coil embedding, first use a road cutter to cut grooves on the road surface. Chamfer the four corners with 45 degrees to prevent the 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 curb. But pay attention: the cutting groove must be clean and free of water or other liquids. When winding the coil, the coil must be straightened, but not too tight and close to the bottom of the groove. After the coil is wound, the output lead wire that has been twisted is led out through the lead slot. In the winding process of the coil, an inductance tester should be used to actually test the inductance value of the inductance coil and ensure that the inductance value of the coil is between 100uH and 300uH. Otherwise, the number of turns of the coil should be adjusted.

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