Detailed Illustration of Construction Principle of Ground Induction Coil Tigerwong Technology

The ground induction coil must be installed at the entrance and exit of each parking lot. What are the principles of the ground induction coil and the matters needing attention during installation? (1) 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. If the conductor is damaged due to aging or insufficient tensile strength, the detector will not work normally.

In the actual project, it is recommended to use teflon high temperature flexible conductor above 1.0mm. coil shape rectangular installation. Generally, the detection coil shall be rectangular. The two long sides are perpendicular to the moving direction of the metal object, and the spacing between them is recommended to be 1m. The length of the long side depends on the width of the road, and the two ends are usually 0.3m to 1m narrower than the road spacing. Tilt 45 DEG; When it is necessary to detect bicycles or motorcycles in some cases, the inclination between the coil and the driving direction can be considered 45° Installation. In some cases, when the road surface is wide (more than 6m) and the chassis of the vehicle is too high, this installation form can be used to disperse the detection points and improve the sensitivity. This installation form can also be used for the detection of sliding door, but the coil must be close to the sliding door. (3) number of turns of the coil in order to make the detector work in the best state, the inductance of the coil shall be kept between 100uh - 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). (4) when winding the coil, the output lead shall be left with 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 interference and 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. (5) embedding method for coil embedding, first use the road cutter to cut the groove on the road surface. 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. Note. The vertical and horizontal inclination of card reader and gate installation shall not be & gt& plusmn; 1° (as shown in the figure) (6) place the card reader and the gate on the ground, on the foundation of the card reader, on the foundation of the gate and on the safety island, place the installation position of the gate according to the customer's requirements and referring to the site conditions, open the gate door, draw the position of the fixing screw on the fixing hole with a pencil, and remove the gate 14. Use the percussion drill bit to fix the screws, but pay attention not to damage the pipeline under the installation position, and then use it 12. When the gate is fixed with expansion screws, gaskets and spring pads must be installed on each screw. After the gate is fixed, the gate must be wiped clean with cotton cloth to keep it clean. After installation, please operate as follows: before wiring, check whether the line identification in the chassis is clear, otherwise, please mark the line; Measure the length from the line to the wiring terminal of the chassis with a ruler, and cut off the excess line after leaving the line with an allowance of 1m; Press the wire with the crimping pliers, and then connect the wire with the crimping nose to the chassis terminal according to the wiring diagram; Check whether the connected wire is connected correctly and whether the terminal is not tightened; When installing the card reader, the power supply, control line, communication line and intercom line must be arranged in PVC separately 25 conduit.

The construction shall be carried out in strict accordance with the specification of separate layout of strong and weak current; The power ground of the card reader must be in good contact with the grounding terminal and keep it unobstructed with the earth. It can be shared with 220V ground, but the grounding terminal must be well grounded. One end of the communication line shielding layer is grounded; Without special requirements of customers, the vertical projection of existing equipment shall not exceed the technical requirements for equipment fixation of safety island (7). A. the inclination of gateway and card reader perpendicular to the horizontal ground shall not be greater than 1 & deg; b. The road gate rod shall be perpendicular to the traffic direction, and the Perpendicularity Error shall not exceed 1 & deg; c. The bottom of the box is in close contact with the ground, and the gap is smoothed with cement. D. card readers and road gates shall not exceed the yellow line of the lane. Finally, I believe you can roughly understand the working principle and precautions of the ground induction coil through the analysis and introduction of the above picture and text.

In fact, the ground induction coil is widely used in some places such as parking lots, small and medium-sized shopping malls and residential areas.