Details.
1. The purpose of coal mining sample is to obtain a test coal sample whose test results are representative of the whole batch of sampled coal.
2. The basic process of sampling and sample preparation is to first collect a considerable amount of coal, i.e., primary subsamples, from many points distributed throughout the batch, then to combine or reduce the primary subsamples directly into a total sample, and finally to put this total sample through a series of sample preparation procedures to make the required number and type of test coal samples.
3. The basic requirement for sampling is that all particles of the sampled batch of coal may enter the sampling equipment and that each particle has an equal chance of being taken into the sample.
4. In order to ensure that the precision of the test results obtained from the specimen meets the requirements, the following factors should be considered when sampling.
(1) sample interceptor opening size should not be less than 2.5 ~ 3 times the nominal larger size of the material.
(2) The total number of samples taken from the batch of coal shall meet the requirements of the standard.
(3) The number and quality of sub-samples of each total sample should meet the standard requirements.
(4) The interceptor shall be started at a predetermined fixed speed from a stationary position through the entire section of material.
5. The interceptor must be positioned completely away from the material when it is stopped or idle.
IV. System Composition and Function Introduction
1. A typical sample collection and production system mainly includes sampler, feeder, crusher, shrinker, sample collector and bucket elevator, etc.
2. At present, our company designs and produces secondary sampling system, which can be adapted to different working conditions.
The process flow of the secondary sampling system is as follows: the primary sampler sends the collected samples to the crusher to crush them through the primary feeder. The crushed sample is passed through the secondary sampler (shrinker) to obtain the final sample, which is collected in a dustproof and waterproof collector and then sent to the test chamber for final testing.
3. The primary sampler and secondary sampler can be programmed, started or operated in sequence by the electrical control center individually, with variable speed and variable control functions, which can adapt to various sampling occasions.
4. All levels of equipment in the sample preparation system are interlocked, and each location is equipped with detection devices to monitor all stages of the sample preparation process to prevent chute clogging and equipment failure, in case of failure, the system will send an alarm and enter the system cleaning or system shutdown. The sample preparation system also has a manual mode for maintenance and testing.
5. Usually, our sampling equipment is electromechanical control system, but it can also be designed as electro-hydraulic control system.
6. For a long time, the sampling equipment produced by our company has been proven to be accurate, effective, safe and reliable under good maintenance.
Working principle of primary sampler
When a sampling cycle begins, the gear motor drives the cutter to rotate rapidly, scraping the full section of the material flow close to the belt for sampling and discharging the sample into the chute.
When the cutter crosses the belt, the electrical switch operates, the motor electromagnetic brake works and applies the brake, and the cutter stops at the starting position of the next cycle (usually set at about the ten o'clock position).
The cutter does not touch the belt during rotation and does not touch the material flow when it returns to the starting position.
The cutter rotates for only about 1 second a week and contacts the material flow for about 0.2-0.3 seconds, so it does not affect the operation of the main belt.
Belt feeder.
The feeder body includes the shell, main and slave drums, slotted pallets, tape, drive unit (machine), cleaning device and tensioning device, etc. See the figure below.
Working principle of ring hammer crusher
After entering the crushing chamber of the crushing device, the material is crushed by the impact of the high-speed rotating hammer ring. The first crushed material gets kinetic energy, rushes to the crushing plate at high speed and is crushed again. At the same time, the materials are also crushed by the impact between each other. After being crushed, the small pieces of materials are crushed again by the crushing, shearing, rolling and grinding action of the rotating hammer ring on the screen (bar), and finally discharged from the screen hole. The debris that cannot be crushed (such as iron, etc.) is pulled into the iron removal chamber.
Ring hammer crusher structure composition
Ring hammer crushing device mainly consists of shell, rotor, screen, driving device, dredging device and detection device, etc., see the figure below (outline drawing of ring hammer crusher).
Working principle of scraper shrinker
When a reduction cycle begins, the gear motor drives the cutter to rotate rapidly, and the cutter scrapes the full section of the material flow close to the belt to take a sample and unload the sample into the sample tank.
When the cutter crosses the belt, the electrical switch operates, the motor electromagnetic brake works and applies the brake, and the cutter stops at the starting position of the next cycle (usually set at about the ten o'clock position).
The cutter does not touch the belt during rotation and does not block the material flow when it returns to the starting position.
Scraper reduction structure composition
The scraper shrinker is mainly composed of shrinker body and electrical control system.
Reducer body
The shrinker body mainly includes the shell assembly, cutter assembly and drive unit (machine), etc., see the following figure
Sample collector structure composition
The sample collector is composed of drive unit, frame, collection tank, rotary mechanism and detection device, etc., see the figure below
Bucket elevator system components
The bucket elevator system is mainly composed of the bucket elevator body and the electrical control system.
Bucket elevator body
The bucket elevator body includes upper section, standard section of central section, separate section of central section, lower section, maintenance platform, conveying unit, drive unit (machine) and tensioning device, etc. See the figure below (bucket elevator shape drawing).
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