CN108663280B - Online detection device and detection method for water content of bulk material - Google Patents

Online detection device and detection method for water content of bulk material Download PDF

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Publication number
CN108663280B
CN108663280B CN201710187929.3A CN201710187929A CN108663280B CN 108663280 B CN108663280 B CN 108663280B CN 201710187929 A CN201710187929 A CN 201710187929A CN 108663280 B CN108663280 B CN 108663280B
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slideway
area
linear motor
charging
moisture
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CN108663280A (en
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胡兵
戴波
刘克俭
曾小信
孙英
戴四元
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Zhongye Changtian International Engineering Co Ltd
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Zhongye Changtian International Engineering Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
    • G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
    • G01N5/045—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder for determining moisture content
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/44—Sample treatment involving radiation, e.g. heat

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

An on-line detection device for moisture of bulk material, the device comprising 4 slides forming a square closed circuit in which a plurality of charge containers (2) are placed; the first slideway (L1) is a feeding area, the second slideway (L2) is a microwave drying area, the third slideway (L3) is a detection area, and the fourth slideway (L4) is a discharging area; each slide is provided with a linear motor with a driving rod for pushing the charge container (2) to slide from one station to the next. The invention can rapidly and accurately detect the water content of different types of bulk materials on line in real time, and the measurement accuracy can reach the accuracy of water measurement by a manual sampling, drying and weighing method.

Description

Online detection device and detection method for water content of bulk material
Technical Field
The invention relates to the field of material moisture detection, in particular to an online detection device and method for bulk material moisture.
Background
In the metallurgical industry, firstly, the water content in the incoming material needs to be accurately detected, and then the water adding amount of the material is controlled according to the water content detection value, so that the water content of the material is kept within a reasonable range in the subsequent process. The real-time detection of the moisture of the material has great influence on the quality and energy consumption index of the final product, and only the moisture of the material is detected rapidly and accurately, the accurate control can be realized, the manual labor can be reduced to a great extent, and the production efficiency is improved. Therefore, the method and the device can quickly detect and analyze the original incoming water, and realize automatic control, which is a key technology in the metallurgical industry.
In the existing metallurgical industry, original incoming material moisture is generally sampled manually and sent to a laboratory for detection and analysis, and moisture detection adopts a drying weightlessness method for detection, so that automatic control cannot be realized because on-line accurate detection cannot be realized, and the detection result is seriously lagged, so that the production efficiency is reduced. In the aspect of moisture detection, an on-line detection mode generally adopts an infrared moisture meter, a microwave moisture meter and the like to detect, and belongs to non-contact measuring equipment, the main problems are inaccurate measurement, high cost, troublesome equipment maintenance and complex structure, so that the difficulty of moisture control is caused, and the instability of quality indexes and energy consumption is further caused.
The patent document with publication number of CN 201607382U and publication date of 2010-10-13, named as a device for detecting water content of materials, discloses a water content measuring method, which effectively ensures that large-size-grade blast furnace materials are dried rapidly and uniformly by adopting a structural design that a cylindrical turntable vertically rotates relative to a microwave generating device by utilizing the principle of microwave drying. However, the technology can only carry out off-line detection in a laboratory, and mainly aims at drying large-particle materials, and cannot meet the requirement of on-line rapid detection.
In the metallurgical industry, moisture detection is often needed for raw materials, for example, fluctuation of physicochemical properties such as moisture and the like in the process of sintering production can cause very bad influence on subsequent sintering production, so that rapid detection and analysis are needed for the raw materials to guide production, and particularly, the moisture of the raw materials such as raw iron ore powder, coke powder, coal dust and the like needs to be detected for each batch, the current method for detecting the moisture of the materials is mainly manual sampling, and the raw materials are sent to a laboratory for detection and analysis, and the moisture detection is mainly a drying weighing method, or an infrared and microwave moisture meter is adopted for online detection, but the measurement is inaccurate and the precision is not high. In addition, the time required by manual sampling, detection and analysis is long, and the labor cost is high. With the improvement of the requirement of the metallurgical industry on the production automation level and the further enhancement of the intelligent manufacturing concept, the manual sampling detection of the moisture of materials cannot meet the requirements of high-yield, high-efficiency and high-automation production.
Through researches, water is used as a polar molecule, the coupling effect of the polar molecule and microwaves is very strong, and the water-containing material can be quickly dried under the action of the microwaves, so that the removal of water is realized. The research result shows that when the microwave drying test is carried out on the common magnetite concentrate materials, the smaller the material quantity is under the microwave power condition of 1000W, the faster the drying is, and when the microwave power is 1000W and the water content of the material is 8.6%, the complete dehydration can be realized by drying 30s for 20g of the magnetite concentrate materials, 40s is needed for 30g of the magnetite concentrate materials, and 50s is needed for 40g of the magnetite concentrate materials. Thus, the microwave can realize the rapid drying of the materials.
Disclosure of Invention
Aiming at the defects and problems existing in the prior art, the invention aims to provide an on-line detection device and method for water content of bulk materials. The invention discloses a device and a detection method capable of detecting the moisture of a material on line in real time based on the strong coupling capability of the moisture of the material and microwaves, adopts microwave heating as a drying means, realizes the on-line rapid drying of the material, obtains the moisture of the material by a weightlessness method, can solve the technical problems facing the above to a great extent, and has the characteristics of rapidness, accuracy and convenience.
According to a first embodiment of the present invention, there is provided an on-line detection device for moisture in bulk material, the device comprising 4 slides, namely a first slide, a second slide, a third slide and a fourth slide, the 4 slides being connected end to end in sequence to form a square or rectangular closed loop, on which one or more (e.g. 2-12, preferably 4-10, more preferably 6-8) charging containers are placed.
The first slideway is a feeding area, the second slideway is a microwave drying area, the third slideway is a detection area, and the fourth slideway is a discharging area;
the first slideway is divided into a first area, a second area serving as a feeding and first weighing station and a third area, wherein the third area is communicated with the second slideway, one end of the first slideway, which is connected with the fourth slideway, is provided with a first linear motor, a driving rod (namely a telescopic main shaft) of the first linear motor is parallel to the longitudinal direction of the first slideway, a hopper is arranged above the second area serving as a feeding position, and the lower part of the second area is provided with a first weighing device;
The second slideway is provided with a second linear motor at one end connected with the first slideway, a driving rod (namely a telescopic main shaft) of the second linear motor is parallel to the longitudinal direction of the second slideway, and one or more first microwave sources are arranged at the top of the second slideway;
the third slideway is divided into a fourth area, a fifth area serving as a secondary weighing station and a sixth area, wherein the sixth area is communicated with the fourth slideway, a third linear motor is arranged at one end of the third slideway, which is connected with the second slideway, a driving rod (namely a telescopic main shaft) of the third linear motor is parallel to the longitudinal direction of the third slideway, and a second weighing device is arranged at the lower part of the fifth area; and
the fourth slideway is divided into a seventh area and an eighth area, wherein the eighth area is communicated with the first slideway, one end of the fourth slideway connected with the third slideway is provided with a fourth linear motor, a driving rod (namely a telescopic main shaft) of the fourth linear motor is parallel to the longitudinal direction of the fourth slideway, and the eighth area is provided with a discharging device.
The number of the charging containers in the detecting device is one or more (e.g., 2-12, preferably 4-10, more preferably 6-8), and the charging containers may be one or more of a charging cartridge, a charging crucible, etc.
Each chute is equipped with a linear motor having a drive rod for pushing the charging cartridge to slide from one station to the next.
Preferably, the discharging device is a negative pressure adsorption discharging device or a purging discharging device; preferably, the discharging device is a blowing type discharging device, the advancing direction of the charging container (such as a charging box or a case) is required to be open or a curved surface with a certain radian, and the discharging port is connected into an existing dust removing system on a production site, so that cleaning and dust removal are facilitated.
Preferably, a first temperature measuring device and a second microwave source are further arranged at the top of the fifth area serving as the secondary weighing station.
Preferably, a gap is formed between two adjacent areas in the first area, the second area and the third area of the first slideway, so that the three areas are completely separated. The width requirement of gap can realize the weighing of first weighing device, can not reveal the microwave again, can also clear up this gap through the mode of blowing with the dust on first weighing device and the first slide, gets into the existing dust pelletizing system in production scene.
Preferably, a gap is formed between two adjacent regions in the fourth region, the fifth region and the sixth region of the third slideway, so as to completely separate the three regions. The width requirement of gap can realize the weighing of second weighing device, can not reveal the microwave again, can also clear up the dust on second weighing device and the third slide through the mode of sweeping away from this gap, gets into the existing dust pelletizing system in production scene.
Typically, the first and fourth slides are roller slides or planar slides. The second slideway and the third slideway adopt plane slideways.
Preferably, the side wall of the second slideway is also provided with a moisture removal system. That is, the moisture is discharged by the air suction.
Preferably, a wave suppression plate (or a microwave blocking plate or a microwave suppression plate) is mounted on top of each of the third region and the sixth region.
Preferably, a second temperature measuring device is arranged at the top of the rear section of the second slideway; the latter is used for measuring the temperature of the last charge container that slides to the rear section of the second slide.
Preferably, two second temperature measuring devices are arranged at the top of the rear section of the second slideway; the latter is used for measuring the temperature of the last and penultimate charge containers that slide to the rear section of the second slide. And when the detected temperature exceeds the alarm temperature (determined by experiments), reducing the microwave output power.
There is no particular limitation on the sampling means or sampling manner, and any sampling means or sampling manner may be employed as long as it is capable of automatic sampling. Preferably, the device further comprises a manipulator as a sampling device, the manipulator being used for grabbing the material to be fed into the hopper.
Or, the device also comprises a sampling driving device as sampling equipment, wherein the sampling driving device comprises a spoon-shaped sampling plane positioned at the front end, a sampling pipeline positioned at the middle end and a sampling driving structure positioned at the tail end, and the sampling driving device is used for grabbing materials and sending the materials into the hopper.
In the application, the material of the charging container is mullite material; preferably, a wear-resistant piece is arranged at the bottom of the charging container, and the wear-resistant piece is preferably made of corundum-mullite material.
The first temperature measuring device and the second temperature measuring device are infrared temperature measuring instruments or other non-contact temperature measuring instruments.
The first weighing device and the second weighing device are electronic sensors or electronic balances. The lower parts of the weighing devices are provided with jacking devices. The first weighing device or the second weighing device is lifted by the lifting device, so that the charging container (for example, the charging box or the bowl) is supported by the first weighing device or the second weighing device (namely, the charging container (for example, the charging box or the bowl) is supported by the lifting device and temporarily leaves the slideway) so as to be weighed. After weighing, the jacking device is lowered and the charge container (e.g. a charge cassette) is again placed on (i.e. supported by) the chute. The jacking device is not particularly limited, and a screw lifter or a hydraulic lifter may be generally used. In addition, it is preferable that the lower part of these weighing devices does not require a jacking device. In this case, the weighing device itself is a separate unit which can be fastened as a separate module between the slides. That is, the weighing tray of the weighing device is positioned in or extends into a hole formed in the slideway and the upper surface of the weighing tray is flush with the surface of the slideway. For a typical size or dimension of the test device, the amount of each sample is typically 50-100g. For large-scale detection device, then because the sample volume is great, great sample weight can lead to weighing tray of weighing device to down elastic deformation, consequently, can adopt jacking device for the charge container is by the complete quilt of jacking. The first and second weighing means are each a separate module which cannot be brought into contact with other parts such as the slide.
Preferably, a gap is formed at the bottoms of the slide rail ends of the third area and the sixth area, so that deposited ash on the slide rail can be cleaned automatically.
In the application, the widths of the first slideway, the second slideway, the third slideway and the fourth slideway may be the same or different. Typically, the widths of the first, second, third and fourth slides are the same. The width of the first slide, the second slide, the third slide and the fourth slide are each independently or all 6-55cm, preferably 7-40cm, preferably 9-35cm, more preferably 12-22cm.
In the present application, the length of the first ramp or the third ramp is, in general, each independently or each 0.55 to 1.6m, preferably 0.65 to 1.3m. Preferably, the lengths of the first and third ramps are the same or substantially the same. Typically, the length of the second ramp or the fourth ramp is, independently of each other, or is, 0.7-2.2m, preferably 0.8-1.5m, for example 1.2 or 1.0m. Preferably, the second ramp and the fourth ramp are the same or substantially the same length. Typically, the length of the first or third ramp is shorter than the length of the second or fourth ramp.
The height of the interior space of the four slides is typically 6-55cm, preferably 8-35cm, more preferably 10-25cm.
According to a second embodiment of the present invention, there is provided a bulk material moisture on-line detection method or a bulk material moisture on-line detection method using the above-described bulk material moisture on-line detection device, the method comprising the steps of:
1) The charge container is slid into the second region by the drive of the drive rod of the first linear motor and the weight (W 0 )；
2) Extracting (e.g., using a manipulator or sampling drive) a sample of material from the blended material from the bulk material mixing process and adding the sample of material to be detected to a hopper, the grasped sample falling through the hopper into a charge container that has been entered into the second zone;
3) The weight (W) of the filled container is again weighed by the first weighing means 1 ) Then pushing the charging container from the second area to the third area under the pushing of the driving rod of the first linear motor;
4) Pushing the charging container to a second slideway from a third area under the pushing of a driving rod of a second linear motor, so that the charging container dries and dehydrates materials in the charging container through a first microwave source in the sliding process of the charging container in the second slideway;
5) After the drying is finished, the charging container is pushed to a fifth area serving as a secondary weighing station of the third slideway under the pushing of the driving rod of the third linear motor, and the weight (W 2 ) Then pushing the charging container from the fifth area to the sixth area under the pushing of the driving rod of the third linear motor;
6) According to formula (W 1 -W 2 )/(W 1 -W 0 ) Calculating the water content (%) of the gripped material sample;
7) Pushing the charging container to a fourth slideway under the pushing of a driving rod of a fourth linear motor, cooling the charging container (particularly, when cooling air is introduced into the outer wall of the furnace body, the cooling effect of materials is better) in the process of (slowly) passing through a seventh area, and realizing discharging through a negative pressure adsorption type discharging device or a purging type discharging device when the charging container reaches an eighth area; and
8) The discharged charging container is pushed to the first area from the eighth area under the pushing of the driving rod of the fourth linear motor, then the charging container is pushed to the second area under the pushing of the driving rod of the first linear motor, and the charging and weighing are carried out again, and the charging and weighing processes are sequentially and circularly carried out.
The mixing materials in the bulk material mixing process are as follows: for example, the mixed materials are conveyed by a belt conveyor at the outlet of a secondary mixer in the sintering process. The bulk material mixing process is as follows: for example, a sintering process secondary mixer mixing process.
Typically, the drive rod of the linear motor is automatically retracted each time a push is completed.
Two discharging modes are adopted, one is a negative pressure adsorption type discharging device, and the principle is the same as that of an industrial dust collector; the other is to adopt a blowing type discharging device, for the discharging device, a charging container structure is required to be shown in fig. 7 or 8, the advancing direction of the charging container is opened or slightly curved with a certain arc angle, the discharged material can be discharged from the outlet through blowing or flat scraping, the discharged material falls onto a bottom belt through a chute at the front part of the charging container, in addition, the negative pressure of the chute outlet is required to be ensured, dust removal is required, and dust accumulation in a furnace or discharge to the environment is prevented.
Typically by being in a period of time t 1 (e.g. t 1 =20 seconds-10 minutes) for the measured moisture content (%) value of the individual charge container (sampling is representative, then single is selected), or an average value is taken from the moisture contents (%) of the plurality of charge containers, and when the difference between the average value and the moisture set value of the production process exceeds the fluctuation allowable value (i.e., threshold value), the water supply amount is controlled by adjusting the water supply valve of the bulk material mixing process until the difference between the subsequently measured average value of the moisture content and the moisture set value of the production process falls within the fluctuation allowable value (i.e., threshold value). The threshold is, for example, ±0.2wt%, preferably, ±0.1wt%, more preferably 0.05wt%.
Preferably, the method further comprises: in step 5), the charging container is pushed into a fifth area serving as a secondary weighing station of the third slideway to be weighed under the pushing of the driving rod of the third linear motor, and meanwhile, the temperature of the material sample is measured through the first temperature measuring device, if the temperature is lower than T Presetting A second microwave source is started to heat the material sample, wherein T is Presetting Selected within the range of 100 ℃ to 400 ℃, preferably 150 ℃ to 250 ℃, if the weight does not change by 0.05g, preferably 0.02g within 2 to 10 seconds, preferably 3 to 5 seconds, the material is considered to be dehydrated completely, and the material is dehydrated completelyThe water content of the material was calculated.
Preferably, all linear motors are each independently arranged at time intervals t 0 And pushing the charge containers one after the other in sequence (i.e., pushing the charge containers forward to slide one station after the front vacates at least one station), thereby causing the charge containers to slide one station, wherein t 0 Is 3 seconds to 60 seconds, preferably 5 seconds to 40 seconds, and the specific time interval is determined by experiments according to different material properties (ingredients, water content, granularity composition and the like).
The material loading container is made of mullite materials and other materials which can resist temperature (above 400 ℃), are wear-resistant, not fragile and wave-transparent, preferably, the wear-resistant piece is arranged at the bottom of the material loading container, and the wear-resistant piece is made of corundum-mullite materials, so that the service life of the material loading container is prolonged.
In the invention, two discharging devices are adopted, one is a negative pressure adsorption type discharging device, and the principle of the negative pressure adsorption type discharging device is the same as that of an industrial dust collector. In addition, when the sweeping type discharging device is used for discharging, the advancing direction of the charging container is required to be open or a curved surface with a certain radian so as to ensure that materials can be discharged in a sweeping manner, the discharged materials fall onto a bottom belt through a chute at the front part of the charging container, in addition, negative pressure at the outlet of the chute is required to be ensured, dust is required to be removed, and dust is prevented from accumulating in the furnace or being discharged to the environment.
In the invention, when the material is grabbed, a baffle is arranged above a belt for a material taking point on the belt for conveying the material, so that the material is ensured to be temporarily stationary while being piled up. For the material taking point with the drop position, a box type material taking device can be used for sampling, and the material taking principle is as follows: the left and right sides of the material taking box of the box type material taking device are provided with side plates, the front and rear sides of the material taking box are opened, the material taking box is firstly extended to the lower position where materials fall, the specific material taking point and the size of the material taking box are determined according to the material taking amount, then a flat material plate is inserted in the middle of drawing back to scrape the materials, finally a scraping plate is inserted in the upper part of a hopper to scrape all the materials in the material taking box into the hopper, and material taking is realized.
In the present invention, the amount of the material to be grasped is usually the same as that of the conventional material to be graspedThe empirical formula ms=kd α . Where alpha has a value of 2 most commonly used in beneficiation processes. Factors determining the magnitude of the k value are: (1) The more uniform the distribution of useful minerals in the ore, the greater the k value; (2) The larger the embedding granularity of useful mineral particles in the ore is, the larger the k value is; (3) the higher the useful mineral content in the ore, the larger the k value; (4) the greater the useful mineral density, the greater the k value; and (5) the smaller the allowable error of the sample grade is, the larger the k value is. The k values for several ores are shown in the following table:
ore type k value
Iron ore (dip dyeing, deposition modification type), manganese ore 0.1～0.2
Kaolin, clay, quartz 0.1～0.2
Fluorite, pyrite 0.2
Magnesite, limestone and dolomite 0.05～1.0
In the invention, the drying and dewatering time of the first microwave source can be determined through experiments according to different incoming material conditions (the relation between microwave power, arrangement of the microwave source, material quantity and the like and the drying and dewatering time of the microwaves is determined through the experiments), and then the frequency of the second motor is determined according to the longitudinal width of the charging container and the number of the charging containers. For example: the width of the charging container is 10cm, 5 charging containers can be placed in the microwave heating area of the second slideway, and the microwave drying and dehydration time of the period is 60s, and the second motor is pushed every 12 s. And a second temperature measuring device is arranged at the top of the last charge container and the last charge container of the second slideway, and when the detected temperature exceeds the alarm temperature (determined by a test), the microwave output power is reduced.
In the invention, the temperature of the charging container is reduced in the process of passing through the seventh area, and particularly, when cooling air is introduced into the outer wall of the furnace body, the cooling effect of materials is better.
In the invention, the principle of detecting moisture and controlling water addition is as follows: each charging container detects a moisture value, the moisture value (%) of each charging container is obtained by carrying out an average treatment on the detection results of a plurality of (2-10) continuous charging containers (the sampling is representative, the single charging container is selected), and a moving average method can be adopted for carrying out statistical calculation, so that the average moisture value of materials in a certain period (20 seconds-10 minutes) is obtained, the value is taken as the actual moisture value of the incoming materials, the actual moisture value is compared with the moisture value required by the production process determined by the process test, the difference value of the two is the water quantity required to be supplemented, and the optimal water adding quantity is controlled by automatic control and adjustment of a valve.
For a bulk material moisture detection device, for example, the amount of each sample is generally 30 to 200g, preferably 50 to 150g.
Compared with the prior art, the invention has the following beneficial effects:
1. the device and the method for detecting the moisture of the bulk materials on line can detect the moisture of different types of materials rapidly and accurately on line in real time, the measurement accuracy can reach the accuracy of water detection by a manual sampling, drying and weighing method, and the problems in the prior art are solved to a great extent;
2. The online detection device for the moisture of the bulk materials can meet the production requirements of the metallurgical industry, is simpler and more efficient than the existing detection equipment system, and has more outstanding automation level;
3. according to the method for detecting the moisture of the bulk material on line, provided by the invention, the moisture of the material is detected on line, automatically, in real time, efficiently and accurately by setting the working parameters, the detection data of the moisture can be obtained in a controlled manner within 20 s-2 min, the processing capacity is large, the representative sample amount can be obtained easily, the accuracy of the moisture detection of the material on line is ensured, and the on-site production requirement is met.
Drawings
FIG. 1 is a schematic diagram of the overall structure of an on-line detection device for bulk material moisture in the invention;
FIG. 2 is a schematic view of the structure of the first slideway in the device of the present invention;
FIG. 3 is a schematic view of the structure of a second slide in the apparatus of the present invention;
FIG. 4 is a schematic view of the structure of a third slide in the apparatus of the present invention;
FIG. 5 is a schematic view of a fourth slide in the apparatus of the present invention;
FIG. 6 is a second schematic structural view of a fourth slide in the apparatus of the present invention;
FIG. 7 is a schematic view of the structure of a charge container in the apparatus of the present invention;
FIG. 8 is a schematic view of another charge container configuration in the apparatus of the present invention;
FIG. 9 is a schematic view of the installation of a baffle over a conveyor belt in accordance with the present invention;
FIG. 10 is a schematic view of the installation of another baffle over a conveyor belt in accordance with the present invention;
FIG. 11 is a schematic diagram showing the operation of the sampling driving device according to the present invention;
FIG. 12 is a second schematic diagram of the operation of the sampling driving device according to the present invention;
FIG. 13 is a schematic view of a purge type discharge device in the apparatus of the present invention.
Reference numerals: l1: a first slideway; l2: the second slideway: l3: a third slideway; l4: a fourth slideway;
t1: a first region; t2: a second region; t3: a third region; t4: a fourth region; t5: a fifth region; t6: a sixth region; t7: a seventh region; t8: an eighth region;
1: a hopper; 2: a charge container (e.g., a charge cartridge); 3: a first weighing device; 4: a first microwave source; 5: a second weighing device; 6: a first linear motor; 7: a second linear motor; 8: a third linear motor; 9: a fourth linear motor; 10: a manipulator; 11: a sampling driving device; 1101: a sampling plane; 1102: a sampling pipe; 1103: a sampling driving structure; 12: a negative pressure adsorption type discharging device; 13: a purge type discharging device; 14: a first temperature measuring device (e.g., an infrared thermometer); 15: a second microwave source; 16: and a baffle.
Detailed Description
According to a first embodiment of the present invention, there is provided an on-line detection device for moisture of bulk material, the device comprising 4 slides, namely a first slide L1, a second slide L2, a third slide L3 and a fourth slide L4, the 4 slides being connected end to end in sequence to form a square or rectangular closed loop, on which one or more (e.g. 2-12, preferably 4-8) loading containers (e.g. loading magazines) 2 are placed;
the first slideway L1 is a feeding area, the second slideway L2 is a microwave drying area, the third slideway L3 is a detection area, and the fourth slideway L4 is a discharging area;
the first slideway L1 is divided into a first area T1, a second area T2 serving as a feeding and first weighing station and a third area T3, wherein the third area T3 is communicated with the second slideway L2, a first linear motor 6 is arranged at one end of the first slideway L1 connected with a fourth slideway L4, a driving rod (namely a telescopic main shaft) of the first linear motor 6 is parallel to the longitudinal direction of the first slideway L1, a hopper 1 is arranged above the second area T2 serving as a feeding position, and a first weighing device 3 is arranged at the lower part of the second area T2;
the second slideway L2 is provided with a second linear motor 7 at one end connected with the first slideway L1, a driving rod (namely a telescopic main shaft) of the second linear motor 7 is parallel to the longitudinal direction of the second slideway L2, and one or more first microwave sources 4 are arranged at the top of the second slideway L2;
The third slideway L3 is divided into a fourth area T4, a fifth area T5 serving as a secondary weighing station and a sixth area T6, wherein the sixth area T6 is communicated with the fourth slideway L4, a third linear motor 8 is arranged at one end of the third slideway L3 connected with the second slideway L2, a driving rod (namely a telescopic main shaft) of the third linear motor 8 is parallel to the longitudinal direction of the third slideway L3, and a second weighing device 5 is arranged at the lower part of the fifth area T5;
the fourth slide way L4 is divided into a seventh area T7 and an eighth area T8, wherein the eighth area T8 is communicated with the first slide way L1, the fourth slide way L4 is provided with a fourth linear motor 9 at one end connected with the third slide way L3, a driving rod (i.e., a telescopic main shaft) of the fourth linear motor 9 is parallel to the longitudinal direction of the fourth slide way L4, and the eighth area T8 is provided with a discharging device.
Preferably, the discharging device is a negative pressure adsorption discharging device 12 or a purging discharging device 13; preferably, the discharging device is a blowing type discharging device 13, the advancing direction of the charging container (such as a charging box or a charging box) 2 is required to be open or a curved surface with a certain radian, and the discharging port is connected into an existing dust removing system on a production site, so that cleaning and dust removal are facilitated.
Preferably, a first temperature measuring device (for example, an infrared thermometer) 14 and a second microwave source 15 are further provided on top of the fifth region T5 as a secondary weighing station.
Preferably, a gap is formed between two adjacent regions in the first region T1, the second region T2 and the third region T3 of the first slideway L1, so as to completely separate the three regions. The width requirement of the gap can not only realize the weighing of the first weighing device (e.g. the electronic sensor) 3, but also not leak microwaves, and can also clean dust on the first weighing device (e.g. the electronic sensor) 3 and the first slideway L1 from the gap in a purging mode, and enter the existing dust removal system on the production site.
Preferably, a gap is formed between two adjacent regions of the fourth region T4, the fifth region T5 and the sixth region T6 of the third slide L3, so as to completely separate the three regions. The width requirement of the gap can not only realize the weighing of the second weighing device (e.g. the electronic sensor) 5, but also not leak microwaves, and dust on the second weighing device (e.g. the electronic sensor) 5 and the third slideway L3 can be cleaned out of the gap in a purging manner and enter the existing dust removal system on the production site.
In general, the first chute L1 and the fourth chute L4 are roller chutes or planar chutes. The second slideway L2 and the third slideway L3 adopt plane slideways.
Preferably, the side wall of the second slideway L2 is also provided with a dehumidifying system.
Preferably, wave suppression plates (or microwave blocking plates) are mounted on top of both the third and sixth regions T3 and T6.
Preferably, a second temperature measuring device (such as an infrared thermocouple) is arranged at the top of the rear section of the second slideway L2; for measuring the temperature of the last charge container (e.g. charge cassette pot) 2 sliding to the rear section of the second ramp L2.
Preferably, two second temperature measuring devices (such as infrared thermocouples) are arranged at the top of the rear section of the second slideway L2; for measuring the temperature of the last (e.g. charge cassette pot) 2 and the next to last (e.g. charge cassette pot) 2 which slide to the rear section of the second ramp L2. And when the detected temperature exceeds the alarm temperature (determined by experiments), reducing the microwave output power.
There is no particular limitation on the sampling means or sampling manner, and any sampling means or sampling manner may be employed as long as it is capable of automatic sampling. Preferably, the device further comprises a manipulator 10 as a sampling device, the manipulator 10 being adapted to grasp the material to be fed into the hopper 1.
Alternatively, the device further comprises a sampling driving device 11 as a sampling apparatus, wherein the sampling driving device 11 comprises a spoon-shaped sampling plane 1101 at the front end, a sampling pipe 1102 at the middle end and a sampling driving structure 1103 at the tail end, and the sampling driving device 11 is used for grabbing materials and sending the materials into the hopper 1.
In the present application, the material of the charging container (for example, charging box, bowl) 2 is mullite material; preferably, a wear-resistant member is mounted on the bottom of the charging container (e.g., a charging tray bowl) 2, and the wear-resistant member is preferably corundum mullite.
The first temperature measuring device 14 and the second temperature measuring device are infrared temperature measuring instruments or other non-contact temperature measuring instruments.
The first weighing device 3 and the second weighing device 5 are electronic sensors or electronic balances.
Preferably, a gap is formed at the bottoms of the slide ends of the third area T3 and the sixth area T6, so that the deposited ash on the slide can be cleaned automatically.
In the application, the widths of the first chute L1, the second chute L2, the third chute L3, and the fourth chute L4 may be the same or different. In general, the widths of the first, second, third, and fourth skids L1, L2, L3, and L4 are the same. The widths of the first, second, third and fourth runners L1, L2, L3, L4 are each independently or are each 6-55cm, preferably 7-40cm, preferably 9-35cm, more preferably 12-22cm.
In the present application, the length of the first runner L1 or the third runner L3 is, in general, each independently or each, 0.55 to 1.6m, preferably 0.65 to 1.3m. Preferably, the first and third runners L1, L3 are the same or substantially the same length. Typically, the length of the second ramp L2 or the fourth ramp L4 is, independently of each other, or both, 0.7-2.2m, preferably 0.8-1.5m, for example 1.2 or 1.0m. Preferably, the second and fourth runners L2, L4 are the same or substantially the same length. In general, the length of the first or third ramp L1 or L3 is shorter than the length of the second or fourth ramp L2 or L4.
The height of the interior space of the four slides is typically 6-55cm, preferably 8-35cm, more preferably 10-25cm.
According to a second embodiment of the present invention, there is provided a bulk material moisture on-line detection method or a bulk material moisture on-line detection method using the above-described bulk material moisture on-line detection device, the method comprising the steps of:
1) The charge container (e.g. charge tray) 2 is slid into the second region T2 by the drive of the drive rod of the first linear motor 6 and the weight (W) of the not yet charged container 2 is weighed by the first weighing device 3 0 )；
2) Extracting (e.g. using a manipulator 10 or a sampling drive 11) a sample of material from the blended material from the bulk material mixing process and adding the sample of material to be tested to the hopper 1, the gripped sample falling through the hopper 1 into a loading container (e.g. a loading magazine tray) 2 which has been entered into the second zone T2;
3) The weight (W) of the filled container 2 is again weighed by the first weighing device 3 1 ) Then pushing the charge container (e.g., a charge cassette) 2 from the second region T2 to the third region T3 under the pushing of the driving lever of the first linear motor 6;
4) Pushing the charge container (e.g., a charge tray bowl) 2 from the third region T3 to the second chute L2 under the pushing of the driving rod of the second linear motor 7, so that the material contained in the charge container (e.g., the charge tray bowl) 2 is dried and dehydrated by the first microwave source 4 during the sliding of the charge container (e.g., the charge tray bowl) 2 in the second chute L2;
5) After the drying is completed, the charging container (for example, a charging tray) 2 is pushed to a fifth area T5 of the third slide L3 as a secondary weighing station by the driving rod of the third linear motor 8, and the weight (W) of the charging container (for example, a charging tray) 2 is weighed by the second weighing device 5 2 ) Then pushing the charge container (e.g., a charge cassette) 2 from the fifth region T5 to the sixth region T6 under the pushing of the driving lever of the third linear motor 8;
6) According to formula (W 1 -W 2 )/(W 1 -W 0 ) Calculating the water content (%) of the gripped material sample;
7) Pushing a charging container (for example, a charging box, or a pot) 2 to a fourth slideway L4 under the pushing of a driving rod of a fourth linear motor 9, cooling the charging container (for example, the charging box, or the pot) 2 in the process of (slowly) passing through a seventh area T7 (particularly, when the outer wall of a furnace body is introduced with cooling air, the cooling effect of materials is better), and realizing discharging by a negative pressure adsorption type discharging device 12 or a purging type discharging device 13 when the charging container reaches an eighth area T8; and
8) The discharged charging container (e.g., charging cartridge) 2 is pushed from the eighth area T8 to the first area T1 by the driving rod of the fourth linear motor 9, and then the charging container (e.g., charging cartridge) 2 is pushed to the second area T2 by the driving rod of the first linear motor 6 to be charged and weighed again, and sequentially and circularly.
Typically, the drive rod of the linear motor is automatically retracted each time a push is completed.
Two discharging modes are adopted, one is a negative pressure adsorption type discharging device 12, and the principle is the same as that of an industrial dust collector; another is to use a purge type discharging device 13, for which a structure of a charging container (e.g., a charging box and bowl) 2 is required as shown in fig. 7 or 8, and the charging container (e.g., a charging box and bowl) 2 is advanced in an open or slightly curved direction with a certain arc angle, so that it is ensured that the material can be discharged from the outlet by purging or scraping, and the discharged material falls onto a bottom belt through a chute in front of the charging container (e.g., a charging box and bowl) 2, and in addition, it is required to ensure that the outlet of the chute is under negative pressure, and dust removal is required to prevent dust from accumulating in the furnace or discharging to the environment.
Typically by being in a period of time t 1 (e.g. t 1 For the measured water content (%) value of the individual charge containers (e.g. charge cassettes, respectively) 2 (sampling is representative, single is selected) or for the water content (%) of the plurality of charge containers (e.g. charge cassettes, respectively) 2, an average value is taken, and when the difference between the average value and the water content set value of the production process exceeds the fluctuation allowable value (i.e. threshold value), the water supply amount is controlled by adjusting the water supply valve of the bulk material mixing process until the difference between the subsequently measured water content average value and the water content set value of the production process is within the fluctuation allowable value (i.e. threshold value). The threshold is, for example, ±0.2wt%, preferably, ±0.1wt%, more preferably 0.05wt%.
Preferably, the method further comprises: in step 5), the loading container (e.g. loading cassette pot) 2 is pushed by the driving rod of the third linear motor 8 to the fifth area T5 of the third slide L3 as the secondary weighing station for weighing, and the temperature of the material sample is measured by the first temperature measuring device (e.g. infrared thermometer) 14, if the temperature is lower than T Presetting Then the second microwave source 15 is started to heat the material sample, wherein T Presetting The water content of the mass is calculated by selecting the mass at a temperature in the range of 100 ℃ to 400 ℃, preferably 150 ℃ to 250 ℃ and considering that the mass is completely dehydrated if the mass does not change by 0.05g, preferably 0.02g, within 2 to 10 seconds, preferably 3 to 5 seconds.
Preferably, all linear motors are independent of each otherAt a certain time interval t 0 And sequentially pushing the charge containers (e.g., the charge cassette bowl) 2 once in sequence (i.e., pushing the charge containers (e.g., the charge cassette bowl) 2 forward to slip one station after having vacated at least one station in front), thereby causing the charge containers 2 to slip one station, where t 0 Is 3 seconds to 60 seconds, preferably 5 seconds to 40 seconds, and the specific time interval is required to be determined by experiments according to different material properties (ingredients, water content, particle size composition and the like).
Preferably, the grasping in step 2) is generally calculated using the following empirical formula, the minimum sample amount necessary to ensure the representativeness of the sample:
M s ＝kd α
wherein Ms-sample minimum mass (kg);
d-particle size (mm) of the largest piece in the sample;
alpha-represents a parameter characteristic of a functional relationship between Ms and d;
k-empirical factor, related to ore properties.
The alpha value is theoretically 3, and the actual value range is l-3; preferably, for certain ores, experimental methods can be used to more accurately determine the k value. A less than 3 represents a compromise because, if a=3 is taken, the necessary amount of sample to be calculated will be large, which requires excessive labor and financial effort. The most commonly used alpha value in beneficiation processes is 2. Factors determining the magnitude of the k value are:
(1) The more uniform the distribution of useful minerals in the ore, the greater the k value; (2) The larger the embedding granularity of useful mineral particles in the ore is, the larger the k value is; (3) the higher the content of useful minerals in the ore, the larger the k value; (4) the greater the useful mineral density, the greater the k value; and (5) the smaller the allowable error of the sample grade is, the larger the k value is. The k values for several ores are shown in Table 1. For certain ores, experimental methods can be used to more accurately determine the k value.
TABLE 1 specific coefficients k of several ore samples
Preferably, the material grabbing by the sampling driving device 11 in the step 2) is specifically:
for the material taking point on the belt conveying materials, a baffle 16 is arranged above the belt, the materials are piled up at the baffle 16, firstly, a sampling driving structure 1103 of a sampling driving device 11 descends, so that a sampling plane 1101 is parallel to the side surface of the baffle 16, the materials piled up by the baffle 16 are extruded to enter the sampling plane 1101, and continuously descends through the sampling driving structure 1103, and the materials on the sampling plane 1101 smoothly flow into a hopper 1 through a sampling pipeline 1102 to realize material taking.
Example 1
Referring to fig. 1, an on-line detection device for moisture of bulk materials includes 4 slides, namely a first slide L1, a second slide L2, a third slide L3 and a fourth slide L4, and the 4 slides are sequentially connected end to form a square closed loop. On the closed loop chute 8 charging magazines 2 are placed. The first slide way L1 is a feeding area, the second slide way L2 is a microwave drying area, the third slide way L3 is a detection area, and the fourth slide way L4 is a discharging area.
As shown in fig. 2, the first chute L1 is divided into a first area T1, a second area T2 as a station for feeding and first weighing, and a third area T3. The third area T3 is connected to the second slide way L2, and the first slide way L1 is provided with a first linear motor 6 at an end connected to the fourth slide way L4, and a driving rod (i.e., a telescopic spindle) of the first linear motor 6 is parallel to a longitudinal direction of the first slide way L1. A hopper 1 is provided at the top of the second region T2 as a feed level, and an electronic sensor 3 is provided at the lower part of the second region T2. Two adjacent areas among the first area T1, the second area T2 and the third area T3 of the first slideway L1 are provided with a gap, so that the three areas are completely separated. The width requirement of the gap can not only realize weighing of the electronic sensor 3, but also prevent leakage of microwaves, and dust on the electronic sensor 3 and the first slide way L1 can be cleaned out of the gap in a sweeping manner and enter an existing dust removal system on a production site. The first slideway L1 adopts a roller slideway. A wave-suppressing plate is mounted on top of the third region T3.
As shown in fig. 3, the second slide L2 is provided with a second linear motor 7 at one end connected to the first slide L1, and a driving rod (i.e., a telescopic main shaft) of the second linear motor 7 is parallel to the longitudinal direction of the second slide L2. The second slideway L2 adopts a plane slideway. The top of the second slideway L2 is provided with a first microwave source 4. The side wall of the second slideway L2 is also provided with a moisture removal system. An infrared thermocouple is arranged at the top of the rear section of the second slideway L2 and is used for measuring the temperature of the last charging box bowl 2 sliding to the rear section of the second slideway L2.
As shown in fig. 4, the third slide way L3 is divided into a fourth area T4, a fifth area T5 as a secondary weighing station, and a sixth area T6, wherein the sixth area T6 is connected to the fourth slide way L4, the third slide way L3 is provided with a third linear motor 8 at one end connected to the second slide way L2, and a driving rod (i.e., a telescopic spindle) of the third linear motor 8 is parallel to the longitudinal direction of the third slide way L3. The lower part of the fifth area T5 is provided with an electronic sensor 5. An infrared thermometer 14 and a second microwave source 15 are also provided on top of the fifth region T5 as a secondary weighing station. A gap is formed between two adjacent regions in the fourth region T4, the fifth region T5 and the sixth region T6 of the third slideway L3, so as to completely separate the three regions. The width requirement of the gap can not only realize weighing of the electronic sensor 5, but also prevent leakage of microwaves, and dust on the electronic sensor 5 and the third slide way L3 can be cleaned out of the gap in a sweeping manner and enter an existing dust removal system on a production site. The third slide way L3 adopts a plane slide way. A wave-suppressing plate is mounted on top of the sixth region T6.
As shown in fig. 5, the fourth slide way L4 is divided into a seventh area T7 and an eighth area T8, wherein the eighth area T8 is connected to the first slide way L1, the fourth slide way L4 is provided with a fourth linear motor 9 at one end connected to the third slide way L3, and a driving rod (i.e., a telescopic main shaft) of the fourth linear motor 9 is parallel to a longitudinal direction of the fourth slide way L4. The eighth region T8 is provided with a discharge device, which is a negative pressure adsorption type discharge device 12. The fourth slideway L4 adopts a roller slideway.
The device further comprises a manipulator 10 as a sampling device, the manipulator 10 being arranged to grasp material to be fed into the hopper 1. And the material of the charging tray 2 in the device is mullite material. The bottom of the charging box bowl 2 is provided with a wear-resistant part, and the wear-resistant part is made of corundum mullite.
Example 2
Example 1 was repeated except that the sampling device of the apparatus was changed to a sampling drive apparatus 11, the sampling drive apparatus 11 comprising a sampling plane 1101 at the front end, a sampling pipe 1102 at the middle end and a sampling drive structure 1103 at the end, the sampling drive apparatus 11 being adapted to grasp the material to be fed into the hopper 1.
Example 3
Example 1 is repeated, as shown in fig. 13, the discharging device of the device is a blowing type discharging device 13, at this time, the advancing direction of the charging box 2 has a curved surface with a certain radian, and the discharging port is connected into the existing dust removing system of the production site, so as to facilitate cleaning and dust removal.
Example 4
Example 1 is repeated except that the first slide L1 and the fourth slide L4 are planar slides.
Example 5
Example 1 was repeated except that two infrared thermocouples were mounted on top of the rear section of the second skid L2 for temperature measurement of the penultimate and last charging cassettes pot 2 and pot 2 sliding to the rear section of the second skid L2.
Example 6
An on-line detection method for moisture of bulk materials, using the device in the embodiment 1, comprises the following steps:
1) The charging tray 2 slides into the second area T2 by the driving rod of the first linear motor 6 and weights the tray 2 not yet charged (W 0 )；
2) A mechanical arm 10 is adopted to grab samples of materials to be detected from the mixed materials conveyed by a belt conveyor at the outlet of the secondary mixer in the sintering process, the samples are added into a hopper 1, and the grabbed samples fall into a charging box bowl 2 which enters a second area T2 through the hopper 1; wherein the sampling amount is about 80 g;
3) The charged tray 2 is again weighed by the electronic sensor 3 (W 1 ) Then in a first straight linePushing the charging box bowl 2 from the second area T2 to the third area T3 by the pushing of the driving lever of the machine 6;
4) Pushing the charging box 2 from the third area T3 to the second slideway L2 under the pushing of the driving rod of the second linear motor 7, so that the materials contained in the charging box 2 are dried and dehydrated through the first microwave source 4 in the process that the charging box pot 2 slides in the second slideway L2;
5) After the drying is completed, the charging tray 2 is pushed to the fifth area T5 of the third slide L3 as the secondary weighing station by the driving rod of the third linear motor 8, and the weight (W 2 ) Then pushing the charging box 2 from the fifth area T5 to the sixth area T6 under the pushing of the driving rod of the third linear motor 8;
6) According to formula (W 1 -W 2 )/(W 1 -W 0 ) Calculating the water content (%) of the gripped material sample;
7) Pushing the charging box 2 to the fourth slideway L4 under the pushing of the driving rod of the fourth linear motor 9, cooling the charging box 2 in the process of (slowly) passing through the seventh area T7 (particularly, when the outer wall of the furnace body is introduced with cooling air, the cooling effect of materials is better), and when the charging box reaches the eighth area T8, discharging by the negative pressure adsorption type discharging device 12; and
8) The discharged charging tray pot 2 is pushed from the eighth area T8 to the first area T1 by the driving rod of the fourth linear motor 9, and then the charging tray pot 2 is pushed to the second area T2 by the driving rod of the first linear motor 6 to be charged and weighed again, and the above steps are sequentially repeated.
In this example 6, during a period t 1 For the measured water contents (%) of the plurality of charging cartridges 2, an average value is taken for 5 minutes, and when the difference between the average value and the water set value of the production process exceeds the fluctuation allowable value (i.e., threshold value), the water supply amount is controlled by adjusting the water supply valve of the bulk material mixing process until the difference between the measured water content average value and the water set value of the production process is within the fluctuation allowable value (i.e., threshold value). The threshold is + -0.1 wt%.
All straightThe wire motors are each independently at certain time intervals t 0 And sequentially pushing the charging box bowl 2 once in sequence, i.e., pushing the charging box bowl 2 forward to slide one station after at least one station is vacated in front, thereby sliding the charging box bowl 2 one station, wherein t is as follows 0 Is 10 seconds.
Example 7
Example 6 is repeated, except that in step 5), the loading magazine 2 is pushed by the driving rod of the third linear motor 8 to the fifth area T5 of the third slide L3 as the secondary weighing station for weighing, and the temperature of the material sample is measured by the infrared thermometer 14, if the temperature is lower than T Presetting Then the second microwave source 15 is started to heat the material sample, wherein T Presetting The temperature is 160 ℃, and the sampling amount is about 70g each time; if the weight does not change by 0.02g within 5 seconds, the material is considered to have been dehydrated completely, and the moisture content of the material is calculated.
Example 8
Example 7 was repeated except that in step 2) a sample of the material to be tested was grasped using the sample drive 11. For the material taking point on the belt conveying materials, a baffle 16 is arranged above the belt, the materials are piled up at the baffle 16, firstly, a sampling driving structure 1103 of a sampling driving device 11 descends, so that a sampling plane 1101 is parallel to the side surface of the baffle 16, the materials piled up by the baffle 16 are extruded to enter the sampling plane 1101, and continuously descends through the sampling driving structure 1103, and the materials on the sampling plane 1101 smoothly flow into a hopper 1 through a sampling pipeline 1102 to realize material taking.
Example 9
Example 7 was repeated except that the discharge was effected in step 7) by means of a purge type discharge device 13. For such a discharging device, the charging box bowl 2 is required to have a structure as shown in fig. 8, and the advancing direction of the charging box bowl 2 has a slight curvature with a certain arc angle, so that the discharged material can be discharged from the outlet in a sweeping manner, the discharged material falls onto the bottom belt through the chute at the front part of the charging box bowl 2, in addition, the negative pressure of the chute outlet needs to be ensured, dust removal is required, and dust accumulation in the furnace or discharge to the environment is prevented.
Example 10
Example 7 was repeated except that T Presetting The temperature is 200 ℃, and the sampling amount is about 60g each time; if the weight change in the amount of weight is less than 0.05g in 5 seconds, the material is considered to have been dehydrated completely, and the water content of the material is calculated.
The device can rapidly and accurately detect the moisture of different types of mineral materials on line in real time, the measurement accuracy can reach the accuracy of water measurement by a manual sampling, drying and weighing method, and the difficult problem in the prior art is solved to a great extent.

Claims (19)

1. The device comprises 4 slide ways, wherein the 4 slide ways are a first slide way (L1), a second slide way (L2), a third slide way (L3) and a fourth slide way (L4), the 4 slide ways are sequentially communicated end to form a square or rectangular closed loop, and one or more charging containers (2) are placed on the slide way of the closed loop;
the first slideway (L1) is a feeding area, the second slideway (L2) is a microwave drying area, the third slideway (L3) is a detection area, and the fourth slideway (L4) is a discharging area;
the first slideway (L1) is divided into a first area (T1), a second area (T2) serving as a feeding and first weighing station and a third area (T3), wherein the third area (T3) is communicated with the second slideway (L2), a first linear motor (6) is arranged at one end of the first slideway (L1) connected with a fourth slideway (L4), a driving rod of the first linear motor (6) is parallel to the longitudinal direction of the first slideway (L1), a hopper (1) is arranged above the second area (T2) serving as a feeding position, and a first weighing device (3) is arranged at the lower part of the second area (T2);
The second slideway (L2) is provided with a second linear motor (7) at one end connected with the first slideway (L1), a driving rod of the second linear motor (7) is parallel to the longitudinal direction of the second slideway (L2), and one or more first microwave sources (4) are arranged at the top of the second slideway (L2);
the third slideway (L3) is divided into a fourth area (T4), a fifth area (T5) serving as a secondary weighing station and a sixth area (T6), wherein the sixth area (T6) is communicated with the fourth slideway (L4), a third linear motor (8) is arranged at one end of the third slideway (L3) connected with the second slideway (L2), a driving rod of the third linear motor (8) is parallel to the longitudinal direction of the third slideway (L3), and a second weighing device (5) is arranged at the lower part of the fifth area (T5); the top of the fifth area (T5) as the secondary weighing station is also provided with a first temperature measuring device (14) and a second microwave source (15)
The fourth slideway (L4) is divided into a seventh area (T7) and an eighth area (T8), wherein the eighth area (T8) is communicated with the first slideway (L1), a fourth linear motor (9) is arranged at one end of the fourth slideway (L4) connected with the third slideway (L3), a driving rod of the fourth linear motor (9) is longitudinally parallel to the fourth slideway (L4), and the eighth area (T8) is provided with a discharging device.
2. The detection apparatus according to claim 1, wherein: the discharging device is a negative pressure adsorption type discharging device (12) or a purging type discharging device (13).
3. The detection apparatus according to claim 2, wherein: the discharging device is a sweeping type discharging device (13), the advancing direction of the charging container (2) is an open or curved surface with a certain radian, and the discharging port is connected into an existing dust removing system on the production site, so that the cleaning and dust removal are facilitated.
4. A detection device according to any one of claims 1-3, wherein: a gap is formed between two adjacent areas in the first area (T1), the second area (T2) and the third area (T3) of the first slideway (L1), so that the three areas are completely separated;
and/or
A gap is formed between two adjacent areas in the fourth area (T4), the fifth area (T5) and the sixth area (T6) of the third slideway (L3) so as to completely separate the three areas.
5. A detection device according to any one of claims 1-3, wherein: the first slideway (L1) and the fourth slideway (L4) adopt roller slideways or plane slideways, and the second slideway (L2) and the third slideway (L3) adopt plane slideways.
6. A detection device according to any one of claims 1-3, wherein: the side wall of the second slideway (L2) is also provided with a dehumidifying system; and/or
Wave suppression plates are arranged on the tops of the third region (T3) and the sixth region (T6).
7. A detection device according to any one of claims 1-3, wherein:
a second temperature measuring device is arranged at the top of the rear section of the second slideway (L2) and is used for measuring the temperature of the last charging container (2) sliding to the rear section of the second slideway (L2); or (b)
Two second temperature measuring devices are arranged at the top of the rear section of the second slideway (L2), and the second temperature measuring devices are used for measuring the temperature of the last charging container (2) and the penultimate charging container (2) which slide to the rear section of the second slideway (L2).
8. A detection device according to any one of claims 1-3, wherein: the device also comprises a manipulator (10), wherein the manipulator (10) is used for grabbing materials and sending the materials into the hopper (1); or (b)
The device also comprises a sampling driving device (11), wherein the sampling driving device (11) comprises a spoon-shaped sampling plane (1101) at the front end, a sampling pipeline (1102) at the middle end and a sampling driving structure (1103) at the tail end, and the sampling driving device (11) is used for grabbing materials and sending the materials into the hopper (1).
9. A bulk material moisture on-line detection method using the bulk material moisture on-line detection apparatus according to any one of claims 1 to 8, the method comprising the steps of:
1) the charge container (2) is slid into the second region (T2) by the drive of the drive rod of the first linear motor (6) and the weight W of the not yet charged charge container (2) is weighed by the first weighing device (3) 0 ；
2) Extracting a sample of the material from the homogenized material from the bulk material mixing process and adding the sample of the material to be detected into a hopper (1), the gripped sample falling via the hopper (1) into a charge container (2) which has been entered into a second zone (T2);
3) The weight W of the filled charge container (2) is weighed again by the first weighing device (3) 1 Then pushing the charging container (2) from the second zone (T2) to the third zone (T3) under the pushing of the driving rod of the first linear motor (6);
4) Pushing the charging container (2) to a second slideway (L2) from a third area (T3) under the pushing of a driving rod of a second linear motor (7), so that the charging container (2) dries and dehydrates materials contained in the charging container (2) through a first microwave source (4) in the process of sliding in the second slideway (L2);
5) After the drying is finished, the charging container (2) is pushed to a fifth area (T5) serving as a secondary weighing station of a third slideway (L3) under the pushing of a driving rod of a third linear motor (8), and the weight W of the charging container (2) is weighed by a second weighing device (5) 2 Then pushing the charging container (2) from the fifth region (T5) to the sixth region (T6) under the pushing of the driving rod of the third linear motor (8);
6) According to formula (W 1 -W 2 )/(W 1 -W 0 ) Calculating the water content (%) of the gripped material sample;
7) Pushing the charging container (2) to a fourth slideway (L4) under the pushing of a driving rod of a fourth linear motor (9), cooling the charging container (2) in the process of passing through a seventh area (T7), and realizing discharging through a negative pressure adsorption type discharging device (12) or a blowing type discharging device (13) when the charging container reaches an eighth area (T8); and
8) The discharged charging container (2) is pushed to the first area (T1) from the eighth area (T8) under the pushing of the driving rod of the fourth linear motor (9), and then the charging container (2) is pushed to the second area (T2) for charging and weighing again under the pushing of the driving rod of the first linear motor (6), and the charging and weighing are sequentially and circularly carried out.
10. The method for on-line detection of moisture in bulk materials according to claim 9, wherein: in step 2), a sample of the material is extracted from the homogenized material from the bulk material mixing process using a sampling drive (11).
11. The method for on-line detection of moisture in bulk materials according to claim 9, wherein: according to a time period t 1 The measured water content (%) of the individual charging containers (2) or the water content (%) of the individual charging containers (2) is averaged according to the water content (%) of the individual charging containers, and when the difference between the detected value and the water content set value of the production process exceeds the fluctuation allowable value, the water supply amount is controlled by adjusting the water supply valve of the bulk material mixing process until the subsequently measured water content average value and the water content set value of the production process are within the fluctuation allowable value.
12. The method for on-line detection of moisture in bulk materials according to claim 11, wherein: t is t 1 =20 seconds-10 minutes.
13. The method for on-line detection of moisture in bulk materials according to claim 11, wherein: the allowable fluctuation value is + -0.2 wt%.
14. The method for on-line detection of moisture in bulk materials according to claim 13, wherein: the allowable fluctuation value is.+ -. 0.1wt%.
15. The method for on-line detection of bulk material moisture according to any one of claims 9-14, wherein:
the method further comprises the steps of: in step 5), the charging container (2) is pushed into a fifth area (T5) serving as a secondary weighing station of a third slideway (L3) to be weighed under the pushing of a driving rod of a third linear motor (8), and meanwhile, a temperature measurement is carried out on a material sample through a first temperature measuring device (14), if the temperature is lower than T Presetting A second microwave source (15) is started to heat the material sample, wherein T Presetting And selecting at 100-400 ℃, and if the weight does not change by 0.05g within 2-10 seconds, considering that the material is dehydrated completely, thereby calculating the water content of the material.
16. The method for on-line detection of bulk material moisture according to any one of claims 9-14, wherein:
all linear motors are independently arranged at a certain time interval t 0 And pushing the charge containers (2) one time in sequence so as to enable the charge containers (2) to slide one station, wherein t is as follows 0 Is 3 seconds to 60 seconds.
17. The method for on-line detection of moisture in bulk materials according to claim 15, wherein: t (T) Presetting Is selected within the range of 150-250 ℃.
18. The method for on-line detection of moisture in bulk materials according to claim 16, wherein: t is t 0 From 5 seconds to 40 seconds.
19. The method for on-line detection of moisture in bulk materials according to claim 15, wherein: if the weight does not change by 0.02g within 3-5 seconds, the material is considered to be dehydrated completely.
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