Probably the most flexible type is the Drop Through Metal Detector, where the material is gravity fed through the inlet of the detector. Metallic particles are detected and immediately rejected by an air-operated rejection system. Adjustable sensitivity coupled with short rejection time ensures minimal loss of good product.
Free-fall units can be found in single-coil or balanced-coil designs and with either analog or digital electronics. Free-fall units may range in aperture size from 25 to 300 mm (1 to 12 in.). Some types possess a quick-clean rejection system that facilitates cleaning in the reject system.
Metal detectors for pneumatically conveyed materials take the shape of a collar around the conveying line. Again, these detectors are available in single- or balanced-coil design with analog or digital electronics. Positive speed control can be obtained on some models to precisely time the reject-gate opening and closing in order to minimize the losing of good material.
Metal detectors for mechanical conveyors take the form of a tunnel all around the conveyor. This method may be coupled with many different customized rejection options for loose or packaged materials. Metal detectors for films and thin sheets use coils that are extremely sensitive at close range. They can fit directly underneath the web and require very little space.
Separators for plug-flow applications are similar in operating principle to some free-fall detector. However, the plug-flow design detects metals in slow-moving or standing columns. An average application is mounting the device under the hopper and merely above the throat from the processing machine. At Bunting Magnetics, we refer to this the “Last Chance Separator” or LCS. The LCS is made to aid batch feeders, blenders, as well as other processing equipment weighing as much as 250 lb. Devices are bolted straight to the infeed in the LCS.
Give a magnet – Place a drawer, grate, hump, liquid-trap, or other magnetic separation unit upstream to work with your detector. Magnetic separators will pull all ferrous metal out before it reaches the detector. This can lighten the stress of contaminants that pass through the detector, increasing its efficiency while minimizing the likelihood of rejecting good material. Additionally, utilization of an upstream magnet allows you to adjust the detector’s sensitivity to some higher level to catch only non-ferrous contaminants.
The detection system is composed of a pulse/echo transducer, a water jet nozzle as well as an x-y table. Foreign bodies such as glass, Super Guard Metal Detector were detected by scanning the flat bottom from the beverage container. Based upon acoustic modeling, a technique for detection and identification of foreign bodies is developed and tested. A transmission processing algorithm for time-frequency analysis can be used to discriminate between beverage and contaminants from ultrasound echoes. Effective detection ability for materials including glass, metals, and plastic, with sizes from 10 to 2.5 mm2 is demonstrated. Experiments were also performed using ultrasonic beam penetrating glass material to detect steel balls of different sizes. This can be nearer to the truth of real foreign body when it comes to orthogonality and cross-section to ultrasound beam.
Detection of metallic and non-metallic objects – Sometimes you just need to know what is hidden behind a surface. As an example behind a wall or cover, or what is inside in a storage container or shipping container. Capacitive proximity sensors are best for level and feed monitoring. From solid material, such as paper or wood, to granules or liquids, they reliably detect the status of the product throughout the production process and final inspection. Will there be something behind that cover? Is the filled package really full?
How much paint is still left in the tank? For capacitive proximity sensors, they are easy questions to answer. Capacitive proximity sensors from SICK are never far from the action. Sensing ranges between 1 and 25 mm let them be applied in nearly all installation situations, which makes them extremely adaptable for a variety of applications. These sensors pbgavn also remarkably resistant against faults. Impurities, contamination, dust, and airborne spray particles have little effect on them, nor does electromagnetic interference. Not surprising they are installed in a wide range of industries, like food, automotive, or even in storage and conveyor systems.
Reliable, powerful, rugged. Inductive proximity sensors from SICK – Millions of inductive proximity sensors are currently in use in virtually all industries. They Portable Walk Through Metal Detector without contact, and are characterized by a long service life and extreme ruggedness. With the latest ASIC technology, SICK’s sensors provide the epitome of precision and reliability. SICK provides the correct answer to meet your preferences every time – from cylindrical or rectangular standard sensors with single, double or triple operating distance, to special sensors for explosive zones and harsh environments. Our sensors would be the intelligent, reliable path to implementing industry-specific and customized answers to any task involving automation.
Junhong Electronic&Technology (Dongguan) Co., Ltd is a professional manufacturer since 2005, specialized in R&D of security detection technology. We have various of products range: Walk through metal detectors, hand held metal detectors, X-ray luggage scanners, X-Ray Body Scanner, Underground Metal Detector, Industrial Metal Detector, Checkweigher, Infrared Body Temperature Detection System; Explosives Detector, Under Vehicle Surveillance Systems; etc.
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