How do I choose a right magnetic sensor in the mining industry?

Question

Anonymous · Answer

Generally speaking, miners should consider these factors when choosing a mining machine:

1. Computing power

The first thing to consider when choosing a mining machine is the issue of computing power. Generally speaking, the higher the computing power, the faster the mining speed and the higher the profit. The computing power of the mining machine is determined by the performance of the chip. The chip is a precision component, and the upgrade of its computing power needs to break through the technical barriers. It is a long process from research and development to production. Therefore, the computing power of mainstream mining machines during the same period does not have much difference.

If there is a mining machine that is several times higher than the average computing power level on the market, but the chip performance and the overall technology of the mining machine have not improved significantly, it should be noted that it is most likely to place a large number of chips on a computing power board, or Place multiple hash boards in a mining machine. There is no essential difference between this approach and putting multiple identical mining machines in a large iron box. Everyone should keep their eyes open when buying mining machines.

2. Power consumption

In addition to computing power, power consumption linked to cost is also a problem we are very concerned about. We can compare the power consumption of different mining machines by calculating the computing power per watt. The computing power per watt is the ratio of power consumption to computing power, and the formula is G/W. The higher the computing power per watt, the higher the conversion rate of machine power consumption, and the better the price/performance ratio of the mining machine.

Some netizens calculated a data, a mainstream mining machine has a computing power of 13.5T and a power consumption of 1350W. The computing power per watt is 10G/W. Another brand of mining machine with a computing power of 12T seems to be not much worse than the former in terms of computing power, but because the power consumption reaches 2100W, the computing power per watt is only 5.85G/W, which is only half of the former. . Using the data per watt of computing power allows you to choose a mining machine more scientifically.

3. The price per T of the mining machine

Purchasing a mining machine is actually buying its computing power. Usually, the price of a mining machine on the market fluctuates according to the price of Bitcoin, but the specific price will be calculated in the unit of computing power. When the electricity bill is relatively high, we need to give priority to the power conversion rate, but when the electricity bill is cheap enough to be negligible, the lower the price per terabyte, the more cost-effective it will be for miners. Therefore, when judging whether the price of a mining machine is reasonable, it can be compared with the market price per terabyte of computing power.

How should we choose when we are faced with multiple mining machine vendors with similar prices?

In fact, at this time, what you look at is character.

Some unscrupulous merchants charge shoddy goods and need to pay attention. In order to prevent being slaughtered as much as possible, we must find a reputable and reliable business.

The mining lady feels that knowing more about this industry is of great benefit to you.

Huang Fei · Answer

Vibrating screen is one of the indispensable equipment in sand production line. The working efficiency of vibrating screen also affects the production efficiency of sand production line. As an important screening equipment, the screening effect of the vibrating screen will affect the use value of the product, so it is very important to select a right vibrating screen equipment.

1. Characteristics of Materials

When choosing vibratory screen, the material characteristics should be taken into account, including the content of material particles under the screen, the content of difficult screen part

1. Characteristics of Materials

When choosing vibratory screen, the material characteristics should be taken into account, including the content of material particles under the screen, the content of difficult screen particles, material moisture, the shape and specific gravity of the material, and the content of clay.

2. Structure of Vibratory Screen

When selecting the vibratory screen, the screen areas, layer numbers, shape, size and area ratio of the screen holes, as well as the motion mode, vibration frequency and amplitude of the vibrating screen should also be considered.

The screening efficiency of the vibratory screen is related to the motion form of the screens, so the fixed screen is lower than that of the moving screen.

3. Screening Purpose

Vibratory screens need to be selected according to different screening purposes. If it is necessary to pre screen materials, circular vibrating screens are generally used; for the classification and screening of crushed materials, large vibrating screens and probability screens are selected; for the deionization and dehydration of materials, linear vibrating screens are better; if it is necessary to desliminate and clean up materials, probability screens are used 。

4. Process Requirements

When selecting the shale shakers, it also needs to be considered according to the processing capacity of the production line, screening method, screening efficiency and the tilt angle of the shale shakers.

5. Professional Vibrating Screen Manufacturer

Professional vibrating screen manufacturers could provide competitive vibrating screen price, diversity customized vibrating screen models, timely after-sales service, spare parts and can continue to provide services for customers’ whole production circle.

Steven J Greenfield · Answer

How do magnetic speed sensors work?

You don’t say which type you mean. Many speedometer/tachometer sensors use magnetic fields.

Analog speedometers had no coils and used no outside electricity. A magnet spun very close to a non-ferrous disk or cup that has the indicating needle attached. Also known as “mechanical speedometers”, although it is not really mechanical in that it is magnetic fields and eddy currents that make it work.

The eddy currents generated in the non-ferrous metal tried to drag it along with the magnet. A light spring that tried to keep the disk from rotating meant that the disk would only rotate a bit and then stay, further when the magnet was spinning faster.

You can see this drag effect when you drop a strong magnet through a copper or aluminum pipe. It will fall very slowly due to this drag.

https://youtu.be/nV4yA8OYwmE
Another type of magnetic speed/tach sensor is the variable reluctance sensor, AKA magnetic inductive sensor. A magnet generates a field that passes through a coil of many turns of wire. A toothed wheel (or a gear) passing close by the end causes the magnetic field to bend to follow the teeth as they pass by. This causes positive and negative pulses of voltage in the coil at the frequency of the teeth passing by.

This signal is fed to electronics that may be analog in older cars using a frequency to voltage converter that drives a meter, or digital in newer cars where a small microprocessor or other digital electronics counts the pulse rate and displays it on a more robust type of meter that is essentially a motor.

The more modern version uses a Hall Effect sensor in place of the coil, but otherwise works the same way.

Is one of these what you meant? I can add to my answer.

Michael Vournazos · Answer

I have a nice Gold Bug. Before that I had a White (don’t remember the model) and before that I had a Bounty Hunter, and as a teenager I built one from scratch, so I do have a little knowledge in this field.

First question is what do you plan to do with it? Some are really good coin shooters and crummy gold hunters. Some are designed for gold and are only so-so as coin shooters. My Gold Bug is excellent at gold and very good at coins - except it can’t tell a nickel from a pull tab, so I almost never find nickels with it.

So, are you looking for gold? or coins? or tracing underground pipes? or Civil War battlefield artifacts? Or what? This is your first consideration.

Once you know what you are going to use it for, then you must determine how much you can afford to spend. Don’t expect it to pay for itself the first time you go into the field! It may, but likely won’t. Now that you know what you want to hunt for and how much you can spend, you can start reading reviews of the various machines and determine what will best suit your needs.

Some of them made for coin shooting will show on the display what coin they think they are detecting. Some will show whether it is a coin shaped object, or a ring, or a pull tab. You will probably want a machine with a “discriminator” function (adjustable!) which will allow you to adjust the response to filter out iron, trash, and ‘hot rocks’ - rocks with high iron content. My Gold Bug discriminator can be adjusted tight enough to filter out most pull tabs, but when I do that I also filter out nickels! ( ratio is digging many, many pull tabs to one nickel, so I filter them out!)

Some detectors will have deeper soil penetration than others, so that might be factor to consider. Some are well suited for detecting in water and on wet beaches, others are not. My Gold Bug coil works fine under water, but I must not get water into the control box.

Coil size and overall weight matter. Larger coils cover more ground at a sweep, but are not as good at exact pinpointing as smaller ones. Weight - well you are going to be carrying this thing and swinging it around for long periods of time. Battery type and size are also considerations. Will you be out long enough to need to recharge batteries. Can you just swap them out for new ones?

OK, now what are some good ones. My list is not complete, but reflects my belief and experience. Each of these manufacturers make several models, some of which are better one thing and worse at others. Reviews of various models is the clue.

FISHER, GARRET, WHITE, RM RICOMAX (a newer company with interesting equipment especially for newbies) , BOUNTY HUNTER, MINELAB are all good machines. Prices can vary from under $100 for a cheap entry level unit to, for one of the Minelab units, over $7000. ( out of my budget!)

Metal detecting is a lot of fun, and can be profitable if you have the time to do it seriously. BUT, be certain you have permission to hunt and dig if you are on private property. You may not know whether or not you are on private property. There is an application called “OnX Hunt” that I have on my smart phone. It is a map/GPS feature that tells whether the land I am standing on is private (with owner’s name) or is public land or some sort of restricted government land. You may want that as well as the detector.

Have fun and don’t forget your knee pads!

Aaron Yong · Answer

Take a look at this setup:

From the image, the magnetic field is orthogonal to the plane of the semiconductor, which produces a specific Hall Voltage. Now imagine this, if the permanent magnet is tilted to a particular angle, it’s magnetic field going through the surface of the semiconductor reduces, which changes the Hall Voltage.

This means that based on the change in tilt angle of the permanent magnet, the hall voltage value would change along with it. This makes the hall effect sensor an analogue sensor. The value of the Hall Voltage could determine the tilt angle of the permanent magnet.

Now imagine putting the permanent magnet to a whisker shaft (picture above), in which it is bendable. The Hall Sensor IC (the semiconductor) is placed in the Whisker Mount - which is stationary all the time. As the whisker is bent, the permanent magnet is tilted, which changes the Hall Voltage measured at the Hall sensor IC. This helps engineers build robotic whiskers that could carry out the exact same functions as biological whisker sensors do. Hope this helps. :)

Reference:

Hall Effect Sensor and How Magnets Make It Works [ http://www.electronics-tutorials.ws/electromagnetism/hall-effect.html ]

The effect of whisker movement on radial distance estimation: a case study in comparative robotics [ http://journal.frontiersin.org/article/10.3389/fnbot.2012.00012/full ]

Richard James Nelson · Answer

210120 - 2328 A GMR sensor is more sensitive than a Hall Effect sensor and may also be what is needed. These may be small and sensitive.

X %3C %3E Y, Sonoran desert Richard

Raghul Deepak · Answer

A magnetic sensor is a device that is used to detect and measure magnetic fields. These sensors can be used to detect the presence or absence of magnetic materials, measure the strength of a magnetic field, and detect changes in magnetic fields over time. Some common types of magnetic sensors include Hall effect sensors, magnetoresistive sensors, and fluxgate sensors.

A proximity sensor, on the other hand, is a sensor that is used to detect the presence of an object without making physical contact with it. Proximity sensors are commonly used in industrial and manufacturing settings to detect the position of materials on a conveyor belt or to detect the presence of machinery or other equipment. There are several types of proximity sensors, including inductive sensors, capacitive sensors, and ultrasonic sensors. In general, proximity sensors work by emitting a field (such as an electric or magnetic field) and measuring changes in that field as an object moves closer or farther away.

Ritwik Sunny · Answer

Magnetic sensors are often used for security and military applications such as detection, discrimination and localization of ferromagnetic and conducting objects, navigation, position tracking and antitheft systems.

Richard James Nelson · Answer

The most common magnetic sensor switches are reed switches.

There are many manufacturers and the example above is from http://standermeder.com

They come a wide range of sizes and sensitivities, they have a full range of contact types and ratings, and they are very popular especially because of their isolation and low cost. The common window alarm uses reed switches.

Reed switches may have coils wound around them and they become reed relays.

The curious reader may visit one of the many vendors who supply reed switches to marvel at the many ways (and number of) a magnet may actuate a reed switch.

X %3C %3E Y, Sonoran desert Richard

Gary L. Peterson · Answer

Typically magnets are chosen based on two factors;

Operating temperatures

Magnetic field strength vs cost

So for a given group of magnet material types that meet the required operating temperature requirements, one then chooses the lowest cost magnet that meets the field strength required for the application.

John Kessler · Answer

I would start by looking at Youtubes of successful search projects and see what they use: Of course, cost is a big factor in your choice of gear. Note all successful searchers use the big detector AND a small hand unit. If you are serious you spend the money. But start with a cheaper simple one. Always try to buy used. People give up on searching very easily.

Himanshu Tiwari · Answer

A solid-state sensor is designed in such a way that the measurand, the physical property to be sensed, exploits a physical phenomenon within the sensor structure. This physical phenomenon leads to an electrical response that can be detected and magnified with electronics.

Or,

Solid State Proximity Sensors

The P Series magnetic proximity sensor is a non-contact, solid state device that is magnetically

Or,

Solid State Proximity Sensors

The P Series magnetic proximity sensor is a non-contact, solid state device that is magnetically actuated for a variety of proximity applications. ... These products require a permanent magnet target, which offers the customer long range sensing and precise limit switching.

Anonymous · Answer

A magnet could detect iron in a copper bar. For example, some ground rods are mostly pure copper, while others are just cheap copper plated steel rods. A magnet can easily be attracted to the iron in the steel ground rod, but won’t be attracted to copper.

Mark Mayer · Answer

It depends on whether you are looking for coins, iron objects, or gold and precious metals. One for coins and iron are generally less expensive. Precious metal detectors run from around $500 - $7,000. Search coil size has a big effect on target size and depth of detection. Find the one for your needs by reading about the detector from the manufacturers. For first timers, simpler is better. Complicated ones with all the bells and whistles are very frustrating until you get the hang of it. Lots of ground balancing issues with the more complicated ones.

Tirthankar Chakraborty · Answer

A good example of a solid-state magnetic sensor is a Hall Effect Sensor. Solid-state means, this sensor has a processing unit that is made of a semiconductor. Now in magnetic sensors, we have several variations. Take the example of a Hall effect sensor.

Hall Effect Sensor is a tiny chip that measures the magnitude of the magnetic field and generates a voltage accordingly. Hall effects are mainly used for proximity detections and current measurements.

Devank Pandya · Answer

For Mining Applications, major instruments used are with sensors of O2, LEL(hydrocarbon/Explosive), H2S, CO.

There are high chances of explosion in mining. But it depends on what kind of mining application you are into. For an explosion to occur, fire triangle of fuel, spark and oxygen needs to be complete. Even if there is presence of explosive gas in environment, but if you do not have adequate oxygen, there would not be fire. All three components need to be present.

If you are concerned about human health and safety, you need to be aware of the possible gases that may be present in the ambient environment. All major sensors are available with leading gas detection suppliers. There might be a hazard of particulate matter. You can also have instrument for that.

If you have some specific issues regarding gas detection. Please feel free to contact me.

Rob Crabb · Answer

It’s called a “hall effect sensor” Hall-effect sensor - Wikipedia [ https://en.wikipedia.org/wiki/Hall-effect_sensor ]

Not sure if it will work for your application though.

Zhongyu Dingli · Answer

In order to select right rock crusher, it is necessarty to get knowlege of the following points.

Quality of rocks for crushing

Quality of rock mainly refers to its hardness and compressive strength. Jaw crusher is undoubtedly a good choice for hard rocks while middle-hard stones can select hammer crusher for crushing & shaping at the same time.

The maximum size of rocks

The size of stones shall not exceed the max feed size of the machine so as to avoid clogging and machine failure.

Capacity per hour

If someone selects a crusher that has lager capacity than his requirements, then it will be uneconomical since as crusher size increases, its fuel burning rate and maintenance cost will be more as well.

Particle size of final products

Although more and more crushers allow customers to adjust the particle size of final materials by easily controlling the machine, it is still necessary to confirm that their requirement for the stone size can be met.

Keiven Hao · Answer

There are many kinds of screening equipment used in the mining industry, but the vibrating screen should be selected firstly to select the vibrating screen suitable for production use. The mining screening equipment includes mining vibrating screen, hot ore vibrating screen, cold ore vibrating screen and heavy-duty fine coal vibrating screen. These kinds of vibrating screens should be compared before use, and selected for screening and screening. The shaker of the material.

Mine vibrating screen is a new type of high-efficiency screening equipment for mining industry. It can save a lot of energ

Mine vibrating screen is a new type of high-efficiency screening equipment for mining industry. It can save a lot of energy by high output, low energy consumption, large screening capacity and stepless adjustment of material running speed within the specified time. The mining vibrating screen has fewer wearing parts than other screening equipment. The mining vibrating screen is suitable for the screening of large block materials and small and medium-sized materials in mining, metallurgy, coal, electric power, building materials, refractory materials, etc. equipment.

The hot ore vibrating screen is mainly suitable for the mining industry with a slightly higher temperature. The sieve plate of the hot ore screen is made of wear-resistant and high-temperature resistant materials, which has good wear resistance, heat resistance, heat resistance and long service life. . However, hot mineral screens are only suitable for use in mines with high material temperatures. The temperature of the material of the cold ore screen is generally not more than 160 degrees. It is a machine working in a low temperature environment. This kind of machinery is mainly customized according to the requirements of customers. There is no fixed model, which is generally not used. Heavy-duty fine coal vibrating screen is generally used in the coal mining industry of selected coal, and is suitable for the ideal machinery for large-scale, mechanized and continuous grading operations in the coal industry.

The versatility of the screening equipment avoids the annoyance of the screening equipment when it is selected, but as long as the nature of the material being dispensed is determined, it is not difficult to select the screening equipment. After comparing the above several screening equipment, it is easier to select the screening equipment.

Mario Obrien · Answer

In order to select right rock crusher, it is necessarty to get knowlege of the following points.

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Quality of rocks for crushing

Quality of rock mainly refers to its hardness and compressive strength. Jaw crusher is undoubtedly a good choice for hard rocks while middle-hard stones can select hammer crusher for crushing & shaping at the same time.

The maximum size of rocks

The size of stones shall not exceed the max feed size of the machine so as to avoid clogging and machine failure.

Capacity per hour

If someone selects a crusher that has lager capacity than his requirements, then it will be uneconomical since as crusher size increases, its fuel burning rate and maintenance cost will be more as well.

Particle size of final products

Although more and more crushers allow customers to adjust the particle size of final materials by easily controlling the machine, it is still necessary to confirm that their requirement for the stone size can be met.