KR20090091621A - Apparatus for measuring moisture content - Google Patents

Abstract

A moisture measuring device is provided to measure the content amount of the moisture in the raw material by measuring the mass of the material before and after drying. A moisture measuring device comprises a sample container(20), a sampling part(30), a sample mass measuring part(40), a heater(50), and a heater conveyor(60). The sampling part puts the sample into the sample container by inserting the sample container into the raw material by the linear reciprocating motion. The sample mass measuring part measures the mass of the sample container. The heater is arranged to be located with the sampling part and sample mass measuring part. The heater heats up the sample. The heater conveyor moves the heater to the top of the sample container.

Description

Moisture content measuring device {APPARATUS FOR MEASURING MOISTURE CONTENT}

The present invention relates to a water content measuring device, and more particularly to a water content measuring device for measuring the water content of the material continuously moved by a conveyor or the like.

Typically, many substances used as raw materials for certain products such as chemicals, papermaking, milling, siliceous sand, analytical coal, iron ore powder, and building materials manufacturing (wood and cement production) contain a certain amount of moisture. It is well known that the characteristics of each product are determined, so accurate measurement and control of moisture content is an important factor in the process in order to optimize product characteristics and control quality. Technology for measuring moisture content has been developed a long time ago, and many efforts have been made to improve the measurement accuracy and to measure moisture on-line stably.

There are direct and indirect methods for measuring moisture. Indirect methods are used rather than direct methods for online application. In recent years, some companies have developed a device that automatically measures the gravimetric method and measures it every 20-30 minutes. However, this method is also not continuous and is maintained because the complex robot-based complex device is installed on site. It is pointed out that there is a problem with the repair.

Indirect moisture measurements include electrical, near-infrared, neutron scattering, and microwave methods. Among them, the electrical method is mainly used for measuring moisture of food, wood, paper, soil, etc. Near-infrared and neutron methods have been used for the longest time for moisture determination of steel raw materials, and recently, some methods using microwaves have been used. However, the measurement of moisture by using the indirect method varies the measured values depending on the installation location, sample type, sample conditions, etc. As a result, errors occur largely and problems such as damage to the device due to unavoidable accidents in the field often occur. I am having difficulty with the on-line measurement of moisture.

In the indirect method, the neutron moisture meter is based on the principle of deceleration of high-speed neutrons by hydrogen atoms, and is mainly used for measuring moisture inside materials. While neutron moisture meter is very easy to measure online, it has been pointed out that the problem is that the density value has to be corrected separately and the radioactive material has to be treated.

Recently, a new type of transmission neutron moisture meter has been developed, and the measurement accuracy has been reported to be considerably improved, but the measurement error is also known to be very large.

Microwave moisture meters (US Pat. No. 5,256,978 and US Pat. No. 5,315,258) using the microwave method are used to measure moisture content by measuring phase change or attenuation of electromagnetic waves, and are used for on-line measurement. The degree of absorption is determined by measuring the degree of absorption of the wavelength range absorbed by moisture in the infrared region, which is absorbed by moisture, and converting it into a moisture content. The device is simple and easy to apply online (especially a material flowing on the belt). On the other hand, the measurement value is significantly different depending on the type of sample, particle size, color, etc. If a relationship between moisture and absorbance is obtained for a sample, it is possible to obtain moisture from absorbance, which is the output of a near-infrared moisture meter, using the relational equation. The relational equation obtained for this purpose is called a calibration curve or simply a calibration curve. The regression method, which is a statistical method, is used to obtain the calibration curve, but most moisture meters are equipped with this function so that it can be easily processed. To set up the calibration curve, first, set the upper limit and the lower limit of the moisture range of the sample to be measured, and prepare three or more specimens having different moisture contents in this range and measure and record the absolute moisture content by gravimetric method. At this time, three to four pieces of data are obtained per sample. Then, for each sample of known moisture, the flaw is measured with a near-infrared moisture meter, and then a calibration curve is drawn using aberration method.

On the other hand, Japanese Patent Application Laid-Open No. 63-063948 has a wavelength (λ1 = 1.94 µm) in which water is absorbed by the near infrared method and a wavelength in which absorption is not caused by moisture (λ2 = 2.1, 2.3 µm). A method of measuring the moisture value by comparing the signal intensity of) is proposed. In addition, Japanese Patent Laid-Open No. 7-243958 describes two slits S1 and S2 of different widths on a rotating disc for measuring near-infrared moisture, which is not affected by particle size changes, and allows light of different amounts to irradiate the surface of the object. The larger the particle size of the workpiece, the greater the influence of surface irregularities, and the larger the ratio of the output variation of the slits S1 and S2 due to the movement. A method of correcting a ratio signal with (λ2) has been proposed.

In Japanese Patent Laid-Open No. 7-198599, a multiple regression analysis is performed using specific wavelength bands (λ1) and (λ2) reflected from an object as independent variables, and the coefficients are determined by a regression equation. A method of measuring the moisture of an unknown subject is proposed.

U.S. Patent No. 5,357,441 proposes to calibrate an infrared moisture measuring apparatus by inputting the reflected light amounts of specific wavelengths [lambda] 1, [lambda] 2 to the measured object into a portable computer.

However, each of these methods solves the fundamental problems of particle size, color, and raw material, such as solving only the particle size problem (Japanese Patent Laid-Open No. 7-243958), or trying to establish an accuracy of calibration curve (Japanese Patent Laid-Open No. 7-198599). It does not solve the problem that it cannot be excluded.

On the other hand, Korean Patent Laid-Open No. 2000-040236 discloses a moisture measuring device using a microwave, and 2001-0058076 discloses a water continuous measuring device of blast furnace input fuel and a control method thereof. JP 2000-0011687 A discloses a measuring device for measuring the content of crushed coke.

The present invention is to solve the problems of the prior art, to provide a moisture content measuring device that can increase the reliability according to the analysis by preparing a sample by collecting a raw material, such as powder minerals continuously moved by a conveyor at regular intervals There is a purpose.

Another object of the present invention is to provide a moisture content measuring apparatus that can accurately measure the moisture content of the raw material continuously supplied by the conveyor to reflect it to the production system.

Another object of the present invention is to provide a moisture content measuring device that can increase the accuracy of the detection value by measuring the content of moisture contained in the raw material by using a difference in mass after sampling the raw material in which the moisture is moistened and dried have.

Water content measuring device of the present invention for achieving the above object is a sample container containing a sample of the raw material that is continuously moved by the conveyor; A sample collecting part for introducing the sample container into the raw material by a periodic linear reciprocating motion so that the sample is contained in the sample container; A sample mass measurement unit provided to be spaced apart from the sample collection unit and measuring a mass of the sample container containing the sample moved from the sample collection unit by a sample container moving unit; A heater provided to be spaced apart from the sample collecting unit and the sample mass measuring unit, for heating and drying the sample contained in the sample container supplied to the sample mass measuring unit; Heater moving means for moving the heater to an upper portion of the sample container supplied to the sample mass measuring unit.

The sampling unit and the base frame; A first actuator installed at the base frame to generate a linear reciprocating motion; A retraction frame connected to the first actuator to linearly reciprocate; A support shaft rotatably provided in the advance frame and provided with mounting means for mounting the sample container at a tip thereof so that the sample container is introduced into the raw material when the advance frame is advanced; And a second actuator installed on the advancing frame to rotate the support shaft.

The sample mass measuring unit is a lifting frame which is lifted by the lifting means installed on the base frame; A mass measuring device provided on the elevating frame, and placed on the sample container containing the sample when the elevating frame is lifted to measure the mass of the sample container and the sample contained therein; And a sample container moving unit for moving the sample container containing the sample from the sample collection unit to an upper portion of the mass meter.

The lifting means includes a plurality of guide bars installed on the base frame to guide the lifting movement of the lifting frame; And a third actuator installed in the base frame to lift the lifting frame.

The sample container moving means is rotatably installed in the base frame, the first actuator is mounted on the rotating frame; A first connecting rod fixed to the rotating shaft of the rotating frame; Both ends are hingedly connected to the edge of the base frame and the first connecting rod, and includes a fourth actuator for rotating the first connecting rod.

The heater moving means includes a second connecting rod rotatably installed on the base frame; A heater mounting bar fixed to the central axis of rotation of the second connecting rod and mounted at the tip thereof; Both ends are hingedly connected to edges of the base frame and the second connection rod, and include a fifth actuator for rotating the second connection rod.

The present invention is powdered coal charged into the coke oven for producing cotton coke, blended raw material charged into the sintering machine to produce sintered ore, the iron source of iron in the blast furnace, limestone charged into the kiln in the cement plant, silica sand charged into the melting furnace in the glass factory Equivalent powdered mineral raw materials are separated from the method of artificially sampling and sent to the analysis room and measuring the moisture content from the conveying conveyor, so that the samples can be collected periodically (approximately 40 minutes interval) by the sampling unit, and stable And accurate moisture measurements can be obtained. And it is possible to solve the problem of process correction value error caused by a mistake in the moisture content of the raw materials in the continuous operation.

In addition, by automating the method of artificial sample work on the belt conveyor which is driven at a high inclination angle at a high speed by the sampling unit, the worker can be protected from the risk of a safety accident. It is designed to increase the accuracy of the measuring device by calculating the data.

Hereinafter, with reference to the accompanying drawings will be described in detail an embodiment of the present invention.

1 to 4 show an embodiment of the moisture content measuring apparatus according to the present invention.

1 to 4, the moisture content measuring apparatus according to the present embodiment includes a sample container 20 containing a sample of a raw material continuously moved by a conveyor 10, and a sample container 20 drawn into a raw material. A sample collection unit 30 which allows the sample of the raw material to be contained in the container, a sample mass measuring unit 40 which measures the mass of the sample contained in the sample container, and a heater for heating and drying the sample contained in the sample container ( 50).

The sampling unit 30 draws the sample container 20 into the raw material by linear reciprocation periodically (approximately 40 minutes apart) so that the raw material moved by the conveyor 10 is contained in the sample container 20. .

For the structure for linearly reciprocating the sample container 20, referring to the accompanying FIG. 4, the base frame 31, a first actuator 32 installed in the base frame and generating a linear reciprocating motion, and a first actuator It consists of a support shaft 34 is connected to the retreat frame 33 is a linear reciprocating motion, and is provided in the retreat frame and the sample container 20 is mounted on the tip.

In addition, the support shaft 34 is rotatably installed on the advance frame 33, and the second actuator 35 for rotating the support shaft 34 is provided on the advance frame 33. This is to discard the sample after measuring the moisture content of the sample. That is, when the support shaft is rotated, the sample container is turned over and the sample is discarded.

The first actuator 32 may be a hydraulic / pneumatic cylinder, and the second actuator 35 may be a hydraulic motor, a servo motor, or the like.

On the other hand, the present embodiment exemplified an example in which the sample container is introduced into the raw material falling by moving by the conveyor so that the falling raw material is contained in the sample container. However, the sample container may be introduced into the raw material moved by the conveyor, and the sample container may be rotated in the raw material by the rotation control of the support shaft so that the sample container contains the sample of the raw material.

3, the sample container 20 is attached to the support shaft 34 by separate mounting means so as not to be separated from the support shaft 34 when the sample container 20 is turned over by the rotation of the support shaft 34. .

The mounting means is provided with a sample container gripping bar 36 to which the sample container 20 is introduced and the sample container inlet hole 36a through which the sample container 20 is slidably formed is coupled to the front end of the support shaft 34. Upper and lower edges of the sample container 20 are formed on the upper and lower edges of the sample container 20 when the sample container 20 is slid, the upper and lower locking jaws 21 are caught by the edge of the sample container inlet hole 36a.

In addition, the sample container is formed with the outer circumferential surface inclined in the form of a light beam lower narrow.

Therefore, when the sample container 20 is turned upside down by the rotation of the support shaft 34, the upper and lower locking jaws 21 are caught by the edge of the sample container inlet hole 36a and are separated from the sample container inlet hole 36a. Is prevented. Then, when the sample container 20 is raised in the sample container inlet 36a, the outer circumferential surface of the sample container 20 is spaced apart from the inner surface of the sample container inlet 36a.

The sample mass measuring unit 40 measures the mass of the sample contained in the sample container by the sample collecting unit.

The sample mass measuring unit 40 is installed on the base frame 31 so as to be elevated by lifting means, and measures the mass of the sample container and the sample contained therein, and the sample container 20 includes a mass measuring device ( It consists of a sample container moving means 42 for moving to the top of 41.

The mass measuring instrument 41 is a precision electronic balance that can accurately measure the mass to 1/100 mg.

The elevating means for elevating the mass meter 41 from the base frame 31 is a lift frame 43 on which the mass meter 41 is installed and lifted from the base frame 31, and is installed on the base frame 31 and lifts up and down. It consists of a plurality of guide bars 44 for guiding the lifting movement of the frame 43, and the third actuator 45 is installed on the base frame 31 to raise and lower the lifting frame 43.

The sample container moving means 42 is rotatably installed on the base frame 31 and mounted to the rotating frame 42a on which the first actuator 32, which is the sample collecting unit 30, is mounted and fixed to the rotating shaft of the rotating frame. The first connecting rod 42c extending in length, and both ends are hinged to the edge of the base frame 31 and the first connecting rod 42c, respectively, to rotate the first connecting rod 42c by a linear reciprocating motion. It consists of four actuators 42b.

As the third and fourth actuators 45 and 42b, hydraulic / pneumatic cylinders are used.

In the structure in which the sample collection unit 30 is mounted on the rotating frame 42a, the first actuator 32 is mounted on the upper surface of the rotating frame 42a, and the advance frame 33 is dobbed on the lower surface of the rotating frame 42a. Sliding is installed by the tail structure and the front end of the advancing frame 33 is bent and connected to the piston of the first actuator (32). The support shaft 34 and the second actuator 35 are located on the bottom surface of the advancing frame 33.

The heater 50 uses a far infrared heater.

The heater moving means 60 for moving the heater 50 to the upper part of the sample container 20 moved to the mass measuring device 41 of the sample mass measuring part 40 is provided.

The heater moving means 60 is a heater connected to the second connecting rod 61 rotatably installed on the base frame 31, the rotating shaft of the second connecting rod 61 and the heater 50 is mounted at the front end thereof. Fifth actuator 63 hinged at both ends of the mounting bar 62 and the edge of the base frame 31 and the second connecting rod 61 to rotate the second connecting rod 61 by a linear reciprocating motion. Is made of.

As the fifth actuator 63, a hydraulic / pneumatic cylinder is used.

Of course, it is natural to include control means for sequentially driving and controlling the first to fifth actuators.

On the other hand, the upper portion of the base frame 31 is provided with a case 70 for protecting the sample taking part 30, the sample mass measuring part 40, the heater 50. On one side of the case 70, the sampling part 30 is rotated so that a passage 71 is formed to be drawn into or drawn out of the case 70.

In addition, the cover 80 protrudes on one side of the passage 71 to protect the sampler 30 when sampling the raw material while the sampler 30 is rotated and drawn out of the case 70. .

The scraper 90 is provided at the tip of the cover 80 to remove the sample that is excessively supplied to the sample container 20. That is, when the sample container 20 is retracted into the cover 80 when the retracting frame 33 is retracted while the sample is contained in the sample container 20, the sample supplied excessively to the sample container 20 is scrapered. Interfered with 90 and removed.

The scraper 90 preferably uses a flexible material having elasticity such as urethane or rubber to prevent the sample from being compacted in the sample container in the process of removing the excess sample.

On the other hand, the opening and closing member 72 for opening and closing the passage 71 of the case 70 is rotatably provided on one side of the case 70. The opening / closing member 72 is rotated by a sixth actuator 73 which is a hydraulic / pneumatic cylinder installed in the case 70.

Therefore, the mechanisms in the case 70 are protected by shielding the passage 71 by the opening / closing member 72.

Hereinafter, the operation and effects of the present embodiment configured as described above will be described.

The retreat frame 33, the support shaft 34, and the sample container gripping bar 36 interlock with each other by the linear reciprocating motion generated by the first actuator 32, and the sample container 20 is a conveyor ( 10) is introduced into the raw material which is continuously moved. At this time, the sample container 20 is continuously taken by the conveyor 10 to take a sample of the raw material from the raw material falling. That is, the falling raw material is contained in a predetermined amount in the sample container (20).

Of course, as mentioned above, the sample container 20 is introduced into the raw material continuously moved by the conveyor 10, and the raw material moved by rotation control by the second actuator 35 is transferred to the sample container 20. It can also be contained.

As described above, when the sample container 20 contains the sample of the raw material, the sample container 20 is moved to the upper portion of the mass measuring device 41 by the sample container moving means 42. That is, the first connecting rod 42c is rotated by the linear reciprocating motion generated by the fourth actuator 42b. At this time, the rotating frame 42a fixed to the same rotating shaft is rotated. This is similar to the principle of cranks that convert reciprocating motion into rotary motion. At this time, the first actuator 32 installed on the rotating frame 42a, the retracting frame 33, the support shaft 34, and the sample container gripping bar 36 connected thereto are centered on the rotation center of the rotating frame 42a. The sample container 20, which is rotated and mounted on the sample container gripping bar 36, is positioned on the upper part of the mass meter 41.

Of course, the mass measuring device 41 is naturally installed to be located at the rotation radius of the sample container 20 during the rotation of the rotating frame 42a.

When the sample container 20 is positioned above the mass meter 41, the lifting frame 43 is lifted by the driving of the third actuator 45. At this time, the sample container 20 is placed on the mass measuring device 41 installed in the lifting frame 43, and the sample container 20 is raised together with the mass measuring device 41.

When the sample container 20 is raised, the sample container 20 is spaced apart from the sample container gripping bar 36. Therefore, the mass meter 41 accurately measures the mass of the sample container 20 and the sample contained therein.

When the mass measurement of the sample is completed, the lifting frame 43 is lowered by the driving of the third actuator 45, and the mass measuring device 41 is lowered. Thus, the sample vessel 20 is also lowered and mounted in the sample vessel inlet 36a.

Then, the second connecting rod 61 is rotated by the above-mentioned crank principle by driving the fifth actuator 63. When the second connecting rod 61 is rotated, the heater mounting bar 62 fixed to the same rotation shaft of the second connecting rod 61 and the heater 50 installed in the heater mounting bar 62 are connected to the second connecting rod ( It is rotated around the rotation center of 61). In this case, the heater 50 is positioned above the sample container 20. Of course, it is natural to design the length of the heater mounting bar so that the mass meter is positioned within the radius of rotation of the heater.

When the heater 50 is positioned above the sample container 20, the sample contained in the sample container is dried by driving the heater 50.

The far-infrared heater, which is a heater, evaporates the moisture contained in the sample while maintaining the temperature of the sample at 150 ° C. At this time, the heating time of the sample is somewhat different depending on the physical properties of the raw material, it is preferable to set to approximately 30 minutes for complete drying.

When drying of the sample is completed, the second connecting rod 61 is reversely rotated by the driving of the fifth actuator 63, and the heater mounting bar 62 and the heater 50 are returned to their original positions. Then, the mass of the sample container 20 and the sample contained therein is accurately measured in the same manner as the mass measurement process of the sample container 20 described above.

As such, when the measurement of the sample mass before drying and the sample mass after drying is completed, the control unit calculates the mass percentage of water relative to the sample mass by the controller to measure the water content contained in the sample.

When the amount of water is measured, the rotation frame 42a is reversely rotated with the reverse rotation of the first connecting rod 42c by the driving of the fourth actuator 42b of the sample container moving means 42, and the first actuator 32 , The retraction frame 33, the support shaft 34, the sample container 20 is in place.

Then, the dried sample is discarded as the support shaft 34 is rotated by the driving of the second actuator 35 and the sample container 20 is turned upside down.

This process is repeated at approximately 40 minute intervals, and the amount of water contained in the raw material continuously moved by the conveyor is periodically measured.

An embodiment of the present invention described above should not be construed as limiting the technical spirit of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and those skilled in the art can change and change the technical idea of the present invention in various forms. Therefore, such improvements and modifications will fall within the protection scope of the present invention, as will be apparent to those skilled in the art.

1 is a view showing an embodiment of a moisture content measuring apparatus according to the present invention,

Figure 2 is a side perspective view of the internal structure of the moisture content measuring apparatus of Figure 1,

3 is a view showing the internal structure of the moisture content measuring apparatus of FIG.

4 is a view illustrating a sample collection unit and a sample container moving unit of the water content measuring apparatus of FIG. 1;

5 is a view showing a sample container and a mounting structure thereof of the moisture content measuring apparatus of FIG.

<Description of Symbols for Main Parts of Drawings>

10 Conveyor 20 Sample Container

30: sampling part 40: sample mass measurement part

50: heater 60: heater moving means

Claims (3)

A sample container containing a sample of the raw material continuously moved by the conveyor; A sample collecting part for introducing the sample container into the raw material by a periodic linear reciprocating motion so that the sample is contained in the sample container; A sample mass measurement unit provided to be spaced apart from the sample collection unit and measuring a mass of the sample container containing the sample moved from the sample collection unit by a sample container moving unit; A heater provided to be spaced apart from the sample collecting unit and the sample mass measuring unit, for heating and drying the sample contained in the sample container supplied to the sample mass measuring unit; And a heater moving unit for moving the heater to an upper portion of the sample container supplied to the sample mass measuring unit. The method of claim 1, The sampling part A base frame; A first actuator installed on the base frame; An advancing frame which is linearly reciprocated by the first actuator; A support shaft rotatably provided in the advance frame and provided with mounting means for mounting the sample container at a tip thereof so that the sample container is introduced into the raw material when the advance frame is advanced; A second actuator installed on the advance frame to rotate the support shaft; The sample mass measuring unit An elevating frame lifted by the elevating means installed on the base frame; A mass measuring device provided on the elevating frame, and placed on the sample container containing the sample when the elevating frame is lifted to measure the mass of the sample container and the sample contained therein; And a sample container moving unit for moving the sample container containing the sample from the sample collection unit to an upper portion of the mass meter. The lifting means A plurality of guide bars installed on the base frame to guide the lifting motion of the lifting frame; A third actuator installed on the base frame to elevate the elevating frame; The sample container moving means A rotating frame rotatably installed on the base frame and on which the first actuator is mounted; A first connecting rod fixed to the rotating shaft of the rotating frame; And a fourth actuator hinged at both ends of the base frame and the edge of the first connecting rod, the fourth actuator rotating the first connecting rod. The heater moving means A second connecting rod rotatably installed on the base frame; A heater mounting bar fixed to the central axis of rotation of the second connecting rod and mounted at the tip thereof; And a fifth actuator hinged at both ends of the base frame and the edges of the second connection rods, and configured to rotate the second connection rods. The method of claim 2, A case having an upper part of the base frame covering the sample container, the sample collecting part, the sample mass measuring part, the heater, and the heater moving means, and having a passage formed therethrough so that the sample taking part is drawn out on one side; A hinge member connected to one side of the case to open and close the passage during rotation; A sixth actuator provided on one side of the case to rotate the opening / closing member; A cover extending in a horizontal direction from the case to one side of the passage so as to cover the sample collection unit when the sample collection unit is drawn out of the case and the sample is collected in the sample container; A scraper provided at the front end of the cover and containing the sample when the sample container is drawn into the cover is further provided with a scraper for interfering with and removing the sample over-supplied to the sample container. The first actuator is fixed to the upper surface of the rotary frame, the advance frame is installed to be slid to the lower surface of the rotary frame, the front end is bent upwardly connected to the first actuator, The support shaft and the second actuator is a moisture content measuring device, characterized in that installed on the lower surface of the advance frame.

Images