1. RCD type suspended magnetic iron removal device which is a main electromagnetic separator domestic production. The iron remover is mainly used in combination with belt conveyors, vibrating conveyors and the like, and can remove ferromagnetic substances in a non-magnetic bulk material with a weight of 0.1 to 25 kg, which can purify raw materials, improve their taste, and can be recycled. Various magnetic substances can also prevent damage and wear of mechanical equipment such as crushers and grinders, and can prevent the belt conveyor belt from being longitudinally torn. It can be widely used in mining, electricity, coal, metallurgy, chemical, glass, paper, building materials, sugar, food and other industries. Its main manufacturers are Zhen Magnetic, Jiang Magnetic and Shen Mine.
There are four types of RCD series electromagnetic iron removers produced by Zhenfang and Jiang Magnetic. The specifications are complete, the energy consumption is low, the suction is large, the performance is stable and reliable, and the removal rate is high.
Model meaning example RCDA (B, C, D)-10A: R - other equipment for mining machinery, C - iron remover, D - electromagnet, A (B, C, D) manual unloading forced cooling type ( Manual unloading iron natural cooling type, automatic unloading iron forced cooling type, automatic unloading iron natural cooling type), 10 - applicable conveyor belt width (dm), A - improvement.
Zhen magnetic and Jiang magnetic RCDB, RCDD series electromagnetic iron remover use heat pipe as heat conduction component, not only has good heat dissipation effect, but also economical and practical, applicable to the requirements of self-cooling type iron remover under various working conditions.
The mounting method of the RCD type iron remover is shown in Fig. 1. The shapes of the RCDA, B series and RCDC and D series iron removers are shown in Figs. 2 and 3, respectively. The technical parameters and external dimensions are listed in Table 1.
The RCDGA type suspended electromagnetic separator manufactured by mining ore and its technical parameters are listed in Table 2.
After many years of exploration and absorption of the strengths of similar products at home and abroad, Longji Magneto has designed and manufactured a new RCD-type suspension type electromagnetic iron remover with low temperature rise, good insulation performance, large magnetic permeability, strong suction and low energy consumption. The performance is stable and reliable, and its technical indicators are in line with the requirements of JB/T689-95 standard, and it is called the ordinary electromagnetic iron remover up to the national standard.
RCD series products have been rated as provincial high-quality products, ranking the leading position of similar products in China. This series of electromagnetic iron remover is used together with various conveyors to remove 0.1~35kg of miscellaneous iron from loose non-magnetic materials. It is suitable for belt speed ≤4.5m/s, which improves material grade, recovers miscellaneous iron and protects the next road. Process machinery and equipment can play a good role, so it is widely used in power plants, mining, building materials, metallurgy, food and other industries.
With the development of the industry, the requirements for material removal in various aspects are constantly improving, especially in some special occasions (such as thick layer, high belt speed, large inclusions or very small iron parts), requirements for iron removal rate. Very high, the ordinary iron remover produced according to the national standard can not meet the needs. In order to solve this problem, Longji Company designed and produced a super-strong electromagnetic iron remover higher than the national standard.
The working principle of super-strong electromagnetic iron remover: According to the analysis of magnetic field mechanics, the ferromagnetic substance can only be attracted in the non-uniform magnetic field. The iron removal effect of the iron remover has a direct relationship with the suction force, assuming that the ferromagnetic substance per unit volume is in the magnetic field. The suction force is F, then F = H • (aH / aL) (H is the magnetic field strength, aH / aL is the magnetic field gradient). It can be seen that the suction of the ferromagnetic substance is not only related to the magnetic field strength, but also directly related to the magnetic field gradient.
The magnetic induction intensities at the rated suspension heights of the T1, T2 and T3 series super-strong electromagnetic iron removers are 90mT, 120mT and 150mT, respectively. The magnetic field gradients are 1.56 times, 2.33 times and 3.17 times respectively of the magnetic field gradient of the national standard. Therefore, it can be concluded that the suction force of the T1, T2, T3 series super-strong electromagnetic iron remover at the rated height is 2.33 times, 4.44 times, 7.55 times of the national standard iron remover, respectively, with strong magnetic field, high gradient and deep magnetic range. The characteristics of large suction force have good removal effect on large iron parts or small iron parts, especially suitable for production places with high iron requirement and belt speed ≤4.5m/s, such as: medium speed grinding in power plant, before fan grinding in addition to iron, iron and the like is removed, the ports and terminals conveyed material iron, coal of low magnetic material of manganese steel.
Model Description: RCD-X 1 X 2 X 3 , R - other equipment for mining machinery, C - iron remover, D - electromagnetic, X 1 - feature code A, B, C, D, E, F :A: electromagnetic series disc air-cooled electric control unloading iron; B: electromagnetic series disc type self-cooling electric control unloading iron; C: electromagnetic series belt type air-cooled automatic unloading iron; D: electromagnetic series belt type self-cooling automatic unloading iron E: electromagnetic series oil-cooled automatic unloading iron; F: electromagnetic series belt type oil-cooled automatic unloading iron, X 2 - applicable bandwidth (mm), X 3 - empty - normal; T - super strong (three levels :T1, T2, T3).
Longkey Magneto produces the following RCD-type suspended electromagnetic separators.
RCDA series air-cooled electromagnetic iron remover uses and features: suitable for working in open air or various light dust environments. The coil is specially treated, anti-oxidation, anti-corrosion, good insulation performance; large heat dissipation area, stable temperature rise and good cooling effect. The main technical parameters are shown in Table 3, and the appearance is shown in Figure 4.
The main technical parameters of RCDA-port T series air-cooled super-strong electromagnetic iron remover are shown in Table 4, and the appearance is shown in Figure 4.
RCDC series air-cooled belt type electromagnetic iron remover uses and features: suitable for all kinds of transport materials to remove iron and work in low dust. Compact structure, easy maintenance, the belt can be automatically corrected, the temperature rise is stable, and centralized control and continuous iron absorption and iron rejection can be realized. The technical parameters are shown in Table 7-5-5, and the appearance is shown in Figure 7-5-5.
RCDG port T series air-cooled belt type super-strong electromagnetic iron remover, the main technical parameters are shown in Table 6, the appearance is shown in Figure 5.
RCDB series self-cooling electromagnetic iron remover uses and features: suitable for a variety of transport materials to remove iron and work in harsh environments. Small size, light weight, compact structure, maintenance-free, no noise, good heat dissipation, low temperature rise, manual control and remote equation control. The technical parameters are shown in Table 7, and the appearance is shown in Figure 6.
RCDB-port T series self-cooling super-strong electromagnetic iron remover, its technical parameters are shown in Table 8, and the appearance is shown in Figure 6.
RCDD series self-cooling belt type electromagnetic iron remover Use and characteristics: It is suitable for removing iron from various conveying materials and can work under the condition of large dust. The structure is compact, easy to maintain, the belt can be automatically corrected, the self-cooling effect ensures normal operation, the noise is small, the operation is simple, and the centralized control and continuous iron absorption and iron charging can be realized. The technical parameters are shown in Table 9, and the appearance is shown in Figure 7.
RCDD-port T series self-cooling belt type super-strong electromagnetic iron remover, its technical parameters are shown in Table 10, and the appearance is shown in Figure 7.
RCDE series oil-cooled electromagnetic iron remover: It is suitable for iron removal of materials in various industries such as coal preparation plant, thermal power plant, chemical industry, mining, building materials and so on. It can work normally in the harsh environment of dust, moisture and corrosion. Features: 1 According to the principle of heat transfer and the patented high-efficiency heat dissipation model, it can effectively ensure the heat dissipation effect of the continuous operation of the iron remover, so that the main machine can run smoothly under the condition of low temperature rise; High-temperature heat-conducting oil, reasonable oil circuit design, smooth and unobstructed, fast circulation, high heat dissipation efficiency; 3 coils are isolated from the outside, closed structure, reasonable design, large contact area with heat-conducting medium, fast heat dissipation; 4 product overall compact and simple structure Reasonable, light weight, no noise, easy to operate, maintenance free. The technical parameters are shown in Table 11, and the appearance is shown in Figure 8.
The use and characteristics of RCDF series oil-cooled belt type electromagnetic iron remover are the same as those of the above RCDE series oil-cooled electromagnetic iron remover. In addition, the belt has automatic deviation correction function, and the horizontal tilt is 15 degrees, which can still operate normally, easy to operate and less maintenance. The technical parameters are shown in Table 12, and the appearance is shown in Figure 9.
RCDK series steel slag special electromagnetic iron remover use: specially designed for steel slag iron selection, direct reduction iron plant iron selection, slag slag workshop iron selection, casting workshop iron selection and other metallurgical slag iron selection.
Features: 1 uniquely designed armored belt, can effectively prevent the damage of sharp ferromagnetic debris on the belt, economical operation; 2 unique magnetic field design and structural design, can effectively reduce the impact of large iron parts on the belt, extend Service life; 3 core full seal design, suitable for occasions with large iron parts and conductive dust, coil insulation is safe and reliable; 4 has belt automatic rectification function, special sealed bearing seat, adapt to work under harsh environmental conditions; 5 compact and reasonable structure It is easy to maintain and maintain, and can operate safely for a long time without failure; 6 complete specifications, there are common types that meet the national standard and super strong type higher than the national standard, and have explosion-proof type.
The technical parameters are shown in Tables 13, 14 and 10.
Liaoyan Magnetic also produces RCD type suspension type electromagnetic iron remover, including RCDD series belt type self-cooling electromagnetic iron remover, RCDC series belt type air-cooled electromagnetic iron remover, RCDB series square plate self-cooling electromagnetic iron remover, RCDA series square plate wind Cold electromagnetic iron remover and RCDD series disc self-cooling electromagnetic iron remover. The characteristics of the RCDC series belt type air-cooled electromagnetic iron remover are as follows: (1) fan cooling, low temperature rise, good insulation, strong suction, large magnetic permeability, safety and reliability; 2 automatic shutdown function with fan failure; It can absorb 0.1~35kg ferromagnetic articles in the depth of non-magnetic materials; 4 can increase belt deviation, overload automatic shutdown alarm and nearby remote control function according to user requirements; 5 can increase strong and weak magnetic conversion function and excitation fault according to user requirements Protection function; 6 can provide products with magnetic induction intensity of 70~150mT according to user requirements; 7 all technical indicators have reached and exceeded JB/T7689-95 standard.
The technical parameters are shown in Table 15, and the appearance is shown in Figure 11.
2. PDC Series Electromagnetic Iron Remover Uses and Features It is suitable for removing iron from various conveying materials and working in harsh environments. Small size, light weight, compact structure, maintenance-free, noise-free, self-cooling effect to ensure normal operation, manual control and remote equation control. The main technical parameters are shown in Table 16, and the appearance is shown in Figure 12.
The technical parameters of the PDG port T series super-strong electromagnetic iron remover are shown in Table 17, and the appearance is shown in Figure 12.
3. MC12 type cross belt type iron remover The iron remover adopts a square electromagnet, and the outer magnetic pole has a square structure, which is suitable for occasions where a large amount of iron is mixed. The suspension is mounted on a belt conveyor to increase the height of the erection and automatically remove iron. Suitable for iron removal of non-magnetic minerals such as coal, coke , limestone , gravel, iron ore.
The iron remover is produced by Yue Magnetic, and its structure and shape are shown in Fig. 13. The main technical parameters and external dimensions are listed in Table 18.
4. MC12 energy-saving cross-belt type iron remover The iron remover is shared with the metal detector. When the metal detector sends out a signal, the iron remover removes the mixed iron parts, thus greatly saving energy. The electromagnet is designed for short-time operation and has a large magnetic potential. Compared with the continuous working system, the cleaning power is greater. It is suitable for the removal of iron from non-magnetic minerals such as coal, coke, limestone, gravel and iron ore.
The series of iron remover is produced by Yue Magnetic. Its structure is basically the same as that of MC12. The outline drawing is shown in Figure 14. The installation method is shown in Figure 14. The technical parameters and external dimensions are shown in Table 19.
5. CTCD type metal detection program controls the electromagnetic iron removal device. This is to install a metal sensor and a reciprocating electromagnetic iron remover in the material conveying system, and control and work through the program control mode, only on the metal sensor to find the conveyor belt. Work when the material is mixed with ferromagnetic materials. Since the excitation system of the electromagnetic iron remover repeatedly works for a short time and performs strong excitation, it has the characteristics of high magnetic field strength and obvious energy saving effect.
The equipment is produced by town magnetism, its installation is shown in Figure 15, and the technical parameters and dimensions are listed in Table 20.
   Table 1  Table 2  table 3  Table 4  table 5  Table 6  Table 7  Table 8  Table 9  Table 10  Table 11  Table 12  Table 13, 14  Table 15  Table 16  Table 17  Table 18  Table 19  Table 20
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6. MCO1 type ore automatic recovery type iron remover This iron remover is specially designed to remove the iron parts contained in the magnetic ore. It is suspended in the middle of the belt conveyor and is equipped with an electric pulley. Thanks to the strong excitation method and the automatic ore recovery method combined with the metal detector, the harmful iron pieces can be automatically and safely removed from the transported ore, and the attracted magnetic ore can be automatically returned to the belt conveyor. Can be recycled. It is mainly used to remove iron from ore, sinter, and pellets.
The MC0l type iron remover is produced by Yue Magnetic. The standard cycle work diagram is shown in Figure 16. The shape and installation method are shown in Figure 17. The main technical parameters and dimensions are listed in Table 21.
7. M003 round iron remover The iron remover is suspended on the belt conveyor and can work continuously. It is fully enclosed and suitable for outdoor open air operations.
Due to its large magnetic potential, it is most suitable for applications where the conveyor belt is thick. It is suitable for removing ferromagnetic impurities from raw materials such as coal, coke, limestone, gravel, cereals, and wood shavings.
The MC03 round iron remover has four suspension modes, namely chain suspension, manual running trolley suspension, chain trolley suspension and electric running trolley suspension. It is produced by Yue Magnetic, its appearance and installation are shown in Figure 18. The main technical parameters and dimensions are listed in Table 22.
8. CF, CFL type suspended electromagnetic iron remover This iron remover is an iron-removing device with earlier use and more usage in China. Because of its convenient operation, stable and reliable performance, reasonable price and low maintenance rate, it has been trusted by users. Its fully enclosed multi-working magnetic pole magnetic circuit structure adapts to work in harsh environments. In 1990, computer-aided design optimization was used to improve the structure of the iron remover, further improving product performance. After the original type modified products plus A, CF represents copper winding core, CFL represents aluminum winding core.
The iron remover is produced by town magnetism, and its installation and appearance are shown in Fig. 19. The main technical parameters and external dimensions are listed in Table 23. Jiang Magnetic also produces this type of iron remover.
9. ZCDL type vibrating electromagnetic iron remover This iron remover is a new type of iron removal equipment developed by Zhenzheng, which can remove ferromagnetic impurities in small particles or powdery non-magnetic raw materials (60~300 mesh) to improve raw materials. The purpose of purity can be widely used in abrasives, refractories, ceramics, glass, chemical and other industries.
The characteristics are as follows: (1) the material to be treated is screened in a multi-layer magnetic grid, and the iron removal effect is good; 2 the raw material is processed in a completely closed state to prevent dust from flying; 3 is suitable for automatic assembly line production, and can be automatically continuous The raw material is processed; 4 the device has a simple structure, convenient maintenance and small floor space.
Working principle: When the excitation coil is connected to DC power, due to the magnetic effect generated by electromagnetic induction, an uneven magnetic field is formed around the material mesh. When the material to be treated passes through the screen, the loose iron particles mixed in the material are sucked. The non-magnetic substance passes evenly under the action of the vibration motor, thereby achieving the purpose of removing iron.
The shape of the iron remover is shown in Fig. 20. The main technical parameters and dimensions are shown in Table 24.
10. LJK series magnetic mine iron removal system LJK series magnetic mine iron removal system is a new product designed and manufactured by Longji Magneto for the magnetic material to remove iron. After years of exploration, it is designed and manufactured on the basis of similar products at home and abroad. The whole system consists of LJK series special belt type iron remover GLA-LK series automatic electric control rectifier cabinet, LJT series magnetic mine special metal detector and WCT series non-magnetic material distribution table. The LJK special belt type iron remover is a complete set. The core part of the system, which is composed of an electromagnetic main magnetic pole and a three-stage electromagnetic separation magnetic pole.
Purpose and scope: LJK occasion requires iron system is mainly used mineral iron plants, steel mills and other magnetic ore sintering plant. Iron parts are extremely susceptible to damage to belts and equipment during transportation of materials. In order to reduce this damage, the iron parts need to be removed during transportation. It can be achieved by using an ordinary iron remover on the belt of general materials, but removing iron on the magnetic ore conveyor belt becomes a problem because some magnetic mines have a higher grade and are easily sucked by the iron remover together with the iron pieces. Come out, and even bring out a large amount of ore, and because of the large amount of ore, the effect of removing iron is not ideal. LJK iron removal system can solve these problems well, relying on its unique technology and special magnetic circuit design to achieve the best separation effect by separating the selected materials multiple times.
Working principle and characteristics: LJK series iron removal system is a new principle of iron removal system designed for the magnetic material to remove iron. The system consists of 4 parts, 4 parts chain operation to complete the iron removal in the magnetic mine. purpose. The working process of LJK series iron removal system is as follows: LJK special belt type iron remover is suspended on the belt conveyor, metal detector is installed 15m before the iron remover, and the non-magnetic material distribution table catches the sucked iron piece behind the iron remover. The automatic electronically controlled rectifier cabinet is connected with the iron remover and the metal detector. When the metal detector detects the incoming iron signal, the signal is sent to the automatic electronically controlled rectifier cabinet. The rectifier cabinet starts the belt type iron remover belt and starts the excitation precisely, when the iron piece When reaching the main magnetic pole, the surface or deep iron and magnetic materials are simultaneously sucked up by the momentary strong excitation, and immediately turned to maintain the excitation state, no longer continue to suck up the material, so that the sucked material is minimized, and the belt is reduced. The amount of mine. The sucked iron piece, together with the magnetic ore, is moved backward by the belt of the iron remover for the first magnetic separation. In the first separation, the large magnetic mine will fall back onto the conveyor belt and then reach the three-stage separated magnetic pole. The magnetic separation zone of the special magnetic field arrangement, after three sortings in the sorting zone, most of the magnetic material is dropped back onto the conveyor belt, and the remaining small amount of material and iron pieces are taken to the non-magnetic material-dispensing platform for separation again. At the same time, the excitation of the LJK iron remover main body is completely stopped, and the iron remover belt stops waiting for the next iron signal. After multiple sorting, a good iron removal effect with a small amount of ore can be achieved. After the whole process, the iron pieces will be brought to the separation area and the ore will return to the conveyor belt.
This series of metal detectors is equipped with LJT series of metal materials for magnetic materials. The detector is specially optimized for magnetic ore (such as sinter) to shield the signal generated by normal ore and accurately determine the iron parts. The instant iron signal is sent out to ensure the real-time and accuracy of the incoming iron signal and the sensitivity of the detection, effectively avoiding leakage and malfunction. The core technology of the whole system is LJK special belt type iron remover. The iron remover consists of a main unit with super magnetic field and three separated magnetic fields with reasonable magnetic field arrangement. Because there are three magnetic separation areas, it can be As far as the effect of iron removal is affected, the problem of a large amount of ore of the recovered type iron remover is solved as much as possible. The separation type magnetic field of the belt type iron remover is reasonable in design and suitable in magnetic field strength, which can fully meet the requirements of separating magnetic materials and iron parts.
LJK special belt type iron remover has low energy consumption, and the coil heat dissipation method is self-cooling type. It adopts a unique magnetic core structure and magnetic circuit design. According to the basic principle that the closed current-carrying coil can generate a stable magnetic field, it is designed as the core of the LJK belt type iron remover, and is welded to the core of the core under the yoke plate. On the outside, the excitation coil is wound according to the optimal heat dissipation condition, and the heat is dissipated by the surrounding casing and the good heat conductive material, and the lower plate covers the lower part of the coil. This design method concentrates the magnetic lines of force to the lower part of the iron remover to excite the super magnetic field at any time. The main coil of the iron remover is composed of a yoke plate, a core, an exciting coil winding, a magnetically conductive outer casing, a lower pallet, and the like. It is composed of components such as frame, auxiliary magnetic pole, unloading iron belt, drum, electric reducer, etc. The belt is driven by the reduction motor to realize automatic unloading. It is characterized by fully enclosed, self-cooling, good insulation, low temperature rise and fast heat dissipation. Large magnetic potential, durable, light weight, strong suction, low energy consumption, high iron removal rate and full electromagnetic. The automatic electronically controlled rectifier cabinet has complete functions, can realize automatic program control, and has stable and reliable working performance.
It is used with various conveyors to remove 0.1~35kg of miscellaneous iron from bulk magnetic materials. It is suitable for transport belts with belt speed ≤4.5m/s. It is used to purify materials, recover miscellaneous iron and protect the next process. Equipment is a good choice.
The LJK series iron removal system is shown in Fig. 21. The technical parameters and external dimensions are listed in Table 25. The metal detector shape and installation dimensions are shown in Fig. 22.
11. Magnetic ore belt conveyor iron removal system Longji magnetoelectric production of magnetic ore belt conveyor iron removal system by CCDD type magnetic mine electromagnetic belt type iron remover, CCDP type magnetic mining electric disk type iron remover, GLA-HD type electronic control Cabinet (control electromagnetic belt type iron remover) GLA-HI or GLA-HII type electric control cabinet (control electric disk type iron remover), XA-1A-A type metal detector, DX type electric walking trolley (with electric disk type) Used for ironware, CLT type loading platform, and equipped with WTP type non-magnetic flat roller or WTC type non-magnetic groove roller (for the working section of the lower belt conveyor of the iron remover), JTC-P type iron collecting car And two sets of spreaders and other components.
CCDD type magnetic mine electromagnetic belt type iron remover is one of the series of series electromagnetic iron remover. CCDP type magnetic mine electric disk type iron remover is one of the disc type recycling series electromagnetic iron remover. It is after years of exploration and absorption of similar products at home and abroad. The essence, the new product designed and manufactured by ourselves. The technical indicators of the iron remover are in compliance with the requirements of JB/T7689-95, and the implementation standards of the electronic control device are GB3797-83, GB4720-84, and GB/T5226.1-1996.
The heat dissipation method of the iron separator coil is a natural cooling type. It features a new thermal and insulating material with a unique core structure and magnetic circuit design. Its characteristics are: self-cooling, good insulation, low temperature rise, fast heat dissipation, large magnetic potential, durable, light weight, strong suction, low energy consumption and high iron removal rate.
The electrical rectification supporting equipment has complete functions, can realize automation and program control, and the working performance is stable and reliable. The electric control device provides DC power supply, excitation and program control for the excitation of the electromagnetic iron remover, and its overall structure is suitable for floor-standing installation.
The CCDD and CCDP type iron remover are used together with the metal detector (the distance between the metal detector and the belt type iron remover is ≥10m, and the distance between the two iron removers is ≥5m), which can be removed from the belt conveyor under harsh environmental conditions. For the 0.1~35kg of heterogeneous iron in the bulk magnetic ore material, the belt speed is ≤4.0m/min, and the iron removal effect is good.
The main body of the CCDD type iron remover can be hung on the I-beam; while the main body of the CCDP type iron remover is suspended under the electric walking trolley on the I-beam.
It is widely used in metallurgical industry magnetic materials such as iron ore, sinter in iron removal, to purify materials, improve material grade, recycle miscellaneous iron, protect the next process of machinery and equipment.
Working principle of iron remover: According to the basic principle that the current-carrying coil can generate magnetic field, it is designed as a CCDD-type magnetic mine electromagnetic strip type iron remover and a CCDP type magnetic mine electric disk type iron remover. The working characteristic is the outer side of the iron core which is welded integrally with the yoke plate, and is wound into an exciting coil under the optimal heat dissipation condition, and the heat is radiated around the outer casing and the heat dissipation channel, and the lower plate covers the lower part of the coil, and the belt is placed. The iron remover drives the belt through the reduction motor to realize automatic unloading of iron; and the disc iron remover is realized by excitation and electronic control.
The structural characteristics of the iron remover: the magnetic flux is concentrated in the lower part of the iron remover at the time of design, and the strip type iron remover is composed of large and small yoke plates, iron core, excitation coil winding, magnetic conductive outer box, lower pallet and the like. Department, and the frame, the iron belt and scraper, the main, driven roller, electric reducer and other components together; and the disc iron remover is composed of large and small yoke, iron core, excitation coil winding and magnetic tube The mainframe consisting of a lower pallet.
The working principle of the metal detector: converts the DC power into a high-frequency current to supply the sensing coil, thereby forming a high-frequency magnetic field. When a metal passes through the high-frequency magnetic field, eddy current is generated in the metal, and the generated eddy current consumes the energy of the high-frequency magnetic field, so that the high-frequency current of the sensing coil increases, the direct current also increases, and the direct current increases. A voltage drop is generated across the resistor R. The voltage drop signal is time differentiated. The processing circuit only amplifies the varying components in the amplification loop, and the amplified output signal is sent to the control loop to generate a control signal. The control signal controls the output of the drive circuit so that the local alarm indication output and the external output operate simultaneously. The main technical parameters of belt type iron remover, disc type iron remover, electric control device and metal detector are listed in Tables 26~29.
   Table 21  Table 22  Table 23  Table 24  Table 25  Tables 26, 27, 28  Table 29
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