Metal detector is a kind of high-performance metal detector, which is specially designed for safety. Compared with the traditional detector, the special design of the working surface in the detection area has the advantages of large detection area, fast scanning speed and high sensitivity. The shell is made of ABS engineering plastic, which has the characteristics of strong resistance, fine technology, light weight and convenient carrying. It can detect all metal objects hidden in the human body. Including jewelry, electrical components, etc. Suitable for airports, customs, docks, banks, buildings, prisons, stadiums, hospitals, schools and other places. This product adopts large-scale integrated circuit, and can be fully equipped with 9V rechargeable battery (optional components), low-voltage indicator light, LED light audible alarm and vibration alarm. It is an ideal product for checking inappropriate items.
Metal detector for food industry
The detection of metal impurities in food industry is mainly used in metal detectors, which are divided into belt type and tube type. The belt type is a conveyor belt. When food passes through the probe on the conveyor belt, if it contains metal impurities, it will be stopped or removed. The tube type is mainly floor-standing, and the food can freely fall to the ground, and it is discharged through the probe alarm.
At present, the number of metal detectors for food is the best in Germany, and foreign products in China are mainly made in Japan. Japanese people are very strict about edible metals. Many domestic products do not meet the requirements in food processing in China, and some special foods do not meet the requirements in Germany, such as raw meat, pickles and canned food. The practice of passing on products in China is a trade secret, which is not easy to clarify. (Metal detectors are electromagnetic principles and are easily disturbed. The standard of trial-produced products is generally determined by.
Application of metal detectors in other industries.
Textile (clothing, apparel, toys, shoes) inspection needle breakage, the special name is inspection machine, inspection machine.
Security anti-theft inspection, the special name is metal inspection door, security inspection door and metal inspection security inspection door.
Testing and installation methods
The metal detector (underground metal detector) circuit has no adjusting parts except the sensitivity adjusting potentiometer. As long as there are no mistakes in welding, the circuit can work normally. The whole machine is static, that is, when the speaker is silent, the total current is about 100 mA, and when the metal speaker is silent, the current of the whole machine rises to 20mA. The new laminated battery can work for 20~30 hours.
If the newly welded metal detector (underground metal detector) can't work normally, first check whether the components and wiring on the substrate are welded incorrectly, and measure whether the battery voltage and power supply circuit are normal. The zener diode VD 1 stabilizes 5.5~6.5V, and the polarity of VD2 should not be welded. The main and final terminals of the vibration coil in the test disc should not be welded incorrectly.
Before using the metal detector, you need to adjust the length of the probe, loosen the black rubber, loosen the rubber to an appropriate length, rotate the tube in the rubber, tighten the cable, turn the front end of the steering wheel upwards, and finally tighten the black rubber and lock the rubber loosening sleeve. In this way, when you hold the handle of the detector, your thumb is just close to adjusting the sensitivity of the potentiometer.
When adjusting the sensitivity of the metal detector, the detection disk (vibrating coil) should be far away from the metal, including the paper with aluminum foil. Turn the sensitivity adjustment potential knob (fine adjustment) to turn on the power switch, turn it to the half position to adjust the tuning of the coarse adjustment potential knob, and stop the sound of the speaker. When a metal detector is used to detect metal, as long as the detection disk is close to any metal, the speaker will make a sound, and when it is far away from a certain position, it will automatically stop the sound.
1960 The world's first metal detector security door was born. The first metal detector that entered the industrial age is also mainly used in industry and mining, and it is a powerful assistant to detect mineral purity and improve efficiency. With the development of society and the increase of criminal cases, metal detectors have introduced a new application field of safety inspection, which is the prototype of the metal detection safety door we use today, which means that human beings have entered a new understanding of safety.
The emergence of products has promoted the development of the industry, and the unfamiliar and familiar industry of security inspection has begun to enter the market. After more than 50 years, metal detectors have undergone several generations of changes in detection technology, from the initial signal simulation technology to the continuous wave technology to the digital pulse technology used today. The simple magnetic field cutting principle of metal detector has introduced many scientific and technological achievements. Sensitivity, resolution, detection accuracy and working performance have all made a qualitative leap. With the improvement of product quality, the application field has also expanded to many industries.
With the rapid development of aviation industry in 1970s, hijacking and dangerous incidents gradually attached importance to the safety of aviation and airports, and metal detection security doors played an important role in investigating prohibited items in many airport equipment. Also in the 1970s, due to the appearance of metal detection security doors in airport security inspection, metal detection security doors began to be an essential security inspection equipment in exhibitions of large-scale sports games (Olympic Games, Asian Games, National Games, etc.). ) and the safety work of important government departments.
In 1980s, prison violence showed a straight upward trend. How to effectively prevent and stop violence as soon as possible became the top priority of prison management. At the same time, while the police strengthen the management of prisoners, metal detection security gates have once again become the security inspection equipment needed by prison management institutions in developed countries such as the United States, Britain and Belgium, and every 300 prisoners use metal detection security gates for security inspection on average.
In the 1990s, the rapidly heating electronic manufacturing industry became the darling of this era. In order to reduce product losses and end the embarrassing situation between employees and companies, large electronic companies have adopted metal detection safety doors and hand-held metal detectors as sharp tools to manage employee behavior and reduce product losses. Therefore, metal detectors have a new role-product anti-theft. After 9.9+0 1 incident, anti-terrorism has become an important topic in the international community. The explosion and the spread of terrorist activities have made terrorists the targets that the security departments of various countries have vowed to crack down on. At this time, the security awareness of the international community has reached a new height. Due to the impact of the 9. 1 1 incident, the configuration of strengthening security work in all walks of life was affected, and the application field of metal detectors also penetrated into other industries.
Metal detectors can detect different types as needed.
Underground type
The underground metal detector is made of advanced technology, which has the characteristics of wide detection range, accurate positioning, strong resolution and simple operation. Metal detectors are mainly used to detect and identify buried metal objects. In addition to military applications, it is also widely used in safety inspection, archaeology, exploration and looking for scrap metal. Also known as iron detector, it is a good assistant for waste recycling.
The underground metal detector uses sound alarm and instrument display, and the detection depth is closely related to the area, shape and weight of the detected metal. Generally, the larger the area, the more the number, and the greater the corresponding detection depth. On the contrary, the smaller the area, the less the number and the smaller the corresponding depth. The maximum detection depth listed in the following table is the result measured by using 60 cm *60 cm *0.5 cm aluminum plate buried in dry soil according to the enterprise standard of the product.
strong function
Installing the ground balance line can eliminate the influence of lightning reaction and greatly improve the depth and accuracy of effective detection.
It has the function of distinguishing ferrous metals from non-ferrous metals.
Adopt intelligent operating system;
Adopt high-strength ABC material packaging, light weight and long life.
Metal sounds can be recognized by headphones.
When the metal is buried underground, it will be inevitably affected by geological structure when it is detected in thick soil layer. The floor contains all kinds of minerals, which will also bring signals to metal detection. The signal of some minerals will mask the signal of metals, causing illusion. In the past, people who used metal detectors all had this experience. The phenomenon that the detectors sounded an alarm when they approached mounds, stones and bricks was called mine reaction. Because this old metal detector can only detect metals in shallow soil, there is no way for metal targets buried deep underground. The deep underground metal detector has advanced ground balance system, which can eliminate the interference of mineralization reaction and greatly improve the detection depth and effect of the instrument.
hand-held
Hand-held metal detectors are used to detect metal objects carried by people or objects. It can detect weapons, explosives or small metal objects, luggage, letters, fabrics and so on carried or wrapped by people. The special appearance of its sensitive surface makes the operation simple. It is superior to manual detection using ring sensor. It has super high sensitivity and special applications, such as prisons, chip factories and archaeological research hospitals.
technical characteristics
-Built-in buzzer
Handheld metal detector,
-Sensitivity can be adjusted.
-Optional headphones for listening to alarms.
-Power supply and alarm indicator light
-Low battery voltage indicator
-Continuous battery life:-Ni-MH battery: 50 hours.
-alkaline battery: 150 hours
-Operating temperature:-15-70 degrees Celsius
-Relative humidity: 0-95%.
-The shell is black shock-proof ABS.
-Weight: 0.365kg (including battery).
Sensitivity is the most important parameter to measure the detection ability of metal detectors. At present, the most advanced hand-held metal detector in the world can detect 0.13g of gold, but it is much more difficult to detect non-ferrous metals because of their poor magnetic field induction.