CN108593716B - Device and method for rapidly measuring solid water content - Google Patents
Device and method for rapidly measuring solid water content Download PDFInfo
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- CN108593716B CN108593716B CN201810665518.5A CN201810665518A CN108593716B CN 108593716 B CN108593716 B CN 108593716B CN 201810665518 A CN201810665518 A CN 201810665518A CN 108593716 B CN108593716 B CN 108593716B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/041—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/10—Measuring moisture content, e.g. by measuring change in length of hygroscopic filament; Hygrometers
Abstract
The invention relates to the technical field of detection equipment, in particular to a device and a method for rapidly measuring solid water content. The device comprises two electrodes, an electrode driving mechanism, an electrode pressure detection mechanism and a control system, wherein the electrode pressure detection mechanism is used for detecting the pressure when the electrodes press the solid, the control system controls the electrode driving mechanism to drive the electrodes to move up and down, and the water content of the solid is calculated according to signals of a water content measurement circuit and a displacement measurement circuit in the control system.
Description
Technical Field
The invention relates to the technical field of detection equipment, in particular to a device and a method for rapidly measuring solid water content.
Background
With the development of scientific research and the progress of production technology, the quantitative analysis of solid moisture has become an important quality index. The moisture content of the solid can affect the quality and the storage of the solid, and particularly for the solid of foods, such as vermicelli, dried beancurd sticks and the like, the food is rotten quickly due to the excessively high moisture content, so that the storage period is shortened, and the food safety problem is caused.
The detection method of the solid water content comprises a direct determination method and an indirect determination method, and the method for determining the water content by utilizing the physical and chemical properties of the water contained in the solid is called the direct determination method, such as a 105 ℃ drying method, a vacuum drying method, a 130 ℃ rapid method, an infrared drying method, a microwave drying method and the like; the method of measuring the water content by using physical indexes such as specific gravity, refractive index, electrical conductivity and electrolytic constant of solid is called indirect measurement method. However, the detection method adopted in mass production at present can only adopt a sampling detection mode for detection, so that the detection period is long, the detection efficiency is low, the numerical value is inaccurate, destructive measurement is performed on products, and the quality control of the products in mass production is very unfavorable.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the device and the method for measuring the solid water content quickly, simply, reliably and at low cost, and the device and the method are suitable for large-scale industrial application.
A device for rapidly measuring the water content of solid comprises two electrodes, an electrode driving mechanism, an electrode pressure detection mechanism and a control system; the two electrodes are arranged on the electrode driving mechanism, the bottom surfaces of the two electrodes are parallel to a plane for placing a solid, and the two electrodes and the electrode driving mechanism are positioned above the solid; the electrode driving mechanism comprises a linear motion driving mechanism, a connecting plate, an electrode mounting plate, a spring and a guide pillar; the electrode pressure detection mechanism is used for detecting the pressure when the two electrodes press the solid, the output signal is a switching value, and when the pressure of the electrodes pressing the solid reaches a set value, the state of the output signal changes; and the control system receives the output signal of the electrode pressure detection mechanism and controls the electrode driving mechanism to drive the electrode to move up and down.
Further, the two electrodes are conductive rubber; the conductive rubber electrode is easily deformed and has a larger contact area with the solid. In addition, the two electrodes can also adopt conductive metal materials, such as red copper, stainless steel and the like.
Further, the linear motion driving mechanism comprises a cylinder top plate, and the cylinder top plate can move along a straight line; the connecting plate is fixed on a cylinder top plate of the linear motion driving mechanism and can linearly move along with the cylinder top plate; one end of the guide post is fixed on the electrode mounting plate, the other end of the guide post penetrates through the hole in the connecting plate and can slide in the hole along the axial direction of the hole, and one end of the guide post, which penetrates through the hole in the connecting plate, is provided with a limiting structure; the spring is positioned between the connecting plate and the electrode mounting plate, and the elastic force of the spring acts on the electrode mounting plate and the connecting plate; the two electrodes are mounted on a lower surface of the electrode mounting plate, and the electrode mounting plate is electrically insulated from the two electrodes.
Further, the linear motion driving mechanism is a cylinder, a hydraulic cylinder, an electric push rod or an electric sliding table.
Further, the electrode pressure detection mechanism comprises a travel switch, the travel switch is mounted on the connecting plate or the electrode mounting plate and is positioned between the connecting plate and the electrode mounting plate, and the mounting position of the travel switch is such that when the force of the electrode pressing to the solid reaches a set value, the output state of the travel switch changes.
Further, the device also comprises an electrode displacement measuring mechanism; the electrode displacement measuring mechanism comprises a displacement sensor, the displacement sensor can directly measure the maximum displacement of the two electrodes, and can also indirectly measure the maximum displacement of the two electrodes by measuring the maximum displacement of the connecting plate or the electrode mounting plate. The displacement sensor is connected to the control system, which measures the maximum displacement of the electrode at each measurement.
Furthermore, the control system comprises a computer, a switching value interface, an analog value interface, a water content measuring circuit, a displacement measuring circuit and an indicating device. The moisture content measuring circuit comprises a divider resistor and a follower, wherein one end of the divider resistor is connected with a power supply, the other end of the divider resistor is connected with an electrode and the input of the follower, the other electrode is grounded, and the output of the follower is connected with a channel of the analog quantity interface.
The method for rapidly measuring the water content of the solid by adopting the device comprises the following steps:
step 2, a control system circularly detects signals of the electrode pressure detection mechanism, controls the electrode driving mechanism to stop driving the two electrodes to descend at the moment when the pressure of the two electrodes reaches a set value, and drives the two electrodes to ascend instead, and simultaneously collects signals of the moisture content measurement circuit and signals of the displacement measurement circuit;
and 4, continuously controlling the electrode driving mechanism to drive the two electrodes to ascend until the two electrodes return to the initial positions, and stopping driving the two electrodes to ascend.
The working principle of the invention is as follows: the specific resistance of the solid with different water contents is different, and the resistance of the solid with the same length and the same cross section area is also different, so that the relation between the resistance of the solid with the specified length and the specified cross section area and the water content of the solid can be found out through experiments, and accordingly, the water content of the solid with the specified length and the specified cross section area can be measured by measuring the resistance of the solid. Meanwhile, the deformation of the solid with different water content is different under the same pressure, generally, the deformation is small when the water content is low, and the deformation is large when the water content is high, and the relation between the water content of the solid and the deformation of the electrode under the same pressure can be found through experiments. In each measurement, the same pressure is applied to the electrode, and the maximum displacement of the electrode reflects the deformation of the solid, so that the water content of the solid can be measured.
For example, for a vermicelli cake with a moisture content in the range of 5% -16%, the correlation between the resistance of a part of a specified length and cross-sectional area and the moisture content is good; under the same pressure action of the electrodes, the correlation between the displacement of the electrodes (deformation of the vermicelli cakes) and the moisture content of the vermicelli cakes is better.
The invention has the technical effects that:
(1) the device and the method for measuring the solid water content are quick, simple, reliable and low in cost, and are suitable for large-scale industrial application;
(2) when the electrode is driven by the electrode driving mechanism to press towards the solid, the spring can provide a buffer to reduce impact, the pressure of the electrode on the solid is kept through the compression of the spring, the electrode pressure is the same when the electrode is pressed down each time, the contact condition of the electrode and the solid is the same each time, and the measurement error is small;
(3) the pressure of the electrode on the solid is the same during each measurement, the resistance and the deformation of the solid between the two electrodes are measured on the premise, and the water content of the solid can be accurately measured.
The invention also has the following advantages: the measurement result not only reflects the water content of the solid surface, but also reflects the internal condition of the solid to a certain extent, and is an integral index.
Drawings
FIG. 1 is a schematic view showing the overall structure of the apparatus for rapidly measuring water content of solids according to the present invention.
FIG. 2 is a schematic view showing a partial structure of the apparatus for rapidly measuring water content of solids according to the present invention.
Fig. 3 is a front view of a partial structure of the electrode reaching a constant pressure measurement position in the present invention.
Fig. 4 is a right side view of a partial structure of the electrode to a constant pressure measuring position in the present invention.
FIG. 5 is a schematic diagram of a water cut measuring circuit according to the present invention.
FIG. 6 is a schematic diagram of the displacement measuring circuit of the present invention.
Fig. 7 is a schematic structural diagram of a control system according to the present invention.
Reference numerals: 1. the device comprises a workbench, 2, a stand column, 3, a cylinder, 3-1, a cylinder body, 3-2, a cylinder ejector rod, 3-3, a cylinder top plate, 4, a cylinder fixing plate, 5, a solid, 6, a displacement sensor, 6-1, a displacement sensor ejector rod, 6-2, a displacement sensor potentiometer, 6-3, a displacement sensor upper wiring terminal, 6-4, a displacement sensor middle wiring terminal, 6-5, a displacement sensor lower wiring terminal, 7, a displacement sensor support, 8, an auxiliary rod, 9, a connecting plate, 10, a guide pillar, 11, a spring, 12, an electrode mounting plate, 13, a first electrode, 14, a second electrode, 15, a travel switch, 16 and a control system.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1-7, the device for rapidly measuring the water content of solid according to the present invention comprises a first electrode 13 and a second electrode 14, an electrode driving mechanism, an electrode pressure detecting mechanism, an electrode displacement measuring mechanism and a control system 16.
As shown in fig. 1 to 3, the electrode driving mechanism includes a cylinder 3, a connecting plate 9, an electrode mounting plate 12, a spring 11, a guide post 10, and the like.
The air cylinder 3 comprises an air cylinder body 3-1, an air cylinder ejector rod 3-2 and an air cylinder top plate 3-3, wherein the air cylinder ejector rod 3-2 is connected with the air cylinder top plate 3-3 and drives the air cylinder top plate 3-3 to do linear motion. The connecting plate 9 is fixed on the cylinder top plate 3-3 and moves linearly along with the cylinder top plate 3-3; one end of the guide post 10 is fixed on the electrode mounting plate 12, the other end of the guide post passes through a hole on the connecting plate 9, the part of the guide post 10 passing through the hole is in clearance fit with the hole, the guide post 10 slides in the hole along the axial direction of the hole, in order to reduce the friction between the guide post and the hole and avoid the central line deflection of the guide post, a linear bearing such as a circular flange linear bearing can be arranged in the hole, and the guide post 10 passes through the hole in the middle of the linear bearing; the end of the guide post 10 penetrating through the hole on the connecting plate 9 is provided with a hexagonal head, the diameter of the circumscribed cylindrical surface of the hexagonal head is larger than that of the guide post 10 penetrating through the hole on the connecting plate 9, so as to limit the maximum distance between the connecting plate 9 and the electrode mounting plate 12, namely, the working stroke of the first electrode 13 and the second electrode 14; the spring 11 is sleeved on the guide post 10, is installed and elastically acts between the connecting plate 9 and the electrode mounting plate 12; the electrode mounting plate 12 is a phenol plastic plate (bakelite plate), and the first electrode 13 and the second electrode 14 are mounted on the lower surface of the electrode mounting plate 12.
The electrode driving mechanism is fixed on the workbench 1 through the upright post 2 and the cylinder fixing plate 4. A solid 5 to be detected (a dough of powder in this embodiment) is placed on the table 1 under the first electrode 13 and the second electrode 14 (the first electrode 13 and the second electrode 14 are made of red copper material). The bottom surfaces of the first electrode 13 and the second electrode 14 are parallel to the upper surface of the workbench 1, and the electrode driving mechanism drives the first electrode 13 and the second electrode 14 to move.
As shown in fig. 3, the electrode pressure detecting mechanism includes a stroke switch 15, and the stroke switch 15 is mounted on the connecting plate 9 between the connecting plate 9 and the electrode mounting plate 12 at a position to ensure that the output state of the stroke switch 15 changes when the force with which the electrodes 13 and 14 are pressed against the solid 5 reaches a set value. The output of the travel switch 15 is connected to the control system 16, and each time of measurement, the control system 16 controls the electrode driving mechanism to drive the two electrodes to move downwards, so that the two electrodes are pressed on the solid 5, and simultaneously detects the output of the travel switch 15, and when the output state of the travel switch 15 is changed, the two electrodes stop moving downwards, and the two electrodes are controlled to lift upwards.
As shown in fig. 3 and 6, the electrode displacement measuring mechanism comprises a displacement sensor 6, the displacement sensor 6 is connected to a control system 16, and the control system 16 controls the maximum displacement of the two electrodes at each measurement. The displacement sensor 6 is a potentiometer type displacement sensor or a laser displacement sensor and comprises a displacement sensor potentiometer 6-2, an upper wiring terminal 6-3 of the displacement sensor, a middle wiring terminal 6-4 of the displacement sensor and a lower wiring terminal 6-5 of the displacement sensor, wherein the three wiring terminals are respectively internally connected to two ends and a sliding end of the displacement sensor potentiometer 6-2; the displacement sensor 6 also comprises a displacement sensor ejector rod 6-1 and an auxiliary rod 8 fixedly arranged on the electrode mounting plate 12, and the upper end plane of the auxiliary rod 8 is propped against the displacement sensor ejector rod 6-1. The displacement sensor 6 is mounted on the cylinder fixing plate 4 through the displacement sensor bracket 7, and since the first electrode 13 and the second electrode 14 are mounted on the electrode mounting plate 12, the displacements of the first electrode 13 and the second electrode 14 can be measured by measuring the displacement of the electrode mounting plate 12.
As shown in fig. 7, the control system 16 includes a computer, a switching value interface, an analog value interface, a moisture content measuring circuit, a displacement measuring circuit, an air valve, an alarm and a display. The control system 16 mainly measures the moisture content of the solid 5 through a moisture content measuring circuit and a displacement measuring circuit. The control system 16 controls the electrode driving mechanism to drive the two electrodes to move up and down, and the first electrode 13, the second electrode 14, the electrode driving mechanism and the electrode pressure detection mechanism are all connected to the control system. During each measurement, the control system 16 controls the electrode driving mechanism to drive the two electrodes to move downwards, so that the first electrode 13 and the second electrode 14 are pressed on the solid 5, meanwhile, the electrode pressure detection mechanism detects the pressure of the two electrodes, when the pressure of the two electrodes reaches a certain set value, the downward movement is stopped, the two electrodes are controlled to lift upwards, and in the process, the minimum value of the resistance of the solid between the two electrodes is detected, so that the moisture content of the solid 5 is judged. The display (display device) is used for displaying the water content measurement result.
As shown in FIG. 5, the moisture content measuring circuit includes a voltage dividing resistor R0And a follower, the divider resistor R0One end is connected with a power supply VmThe other end is connected with the input ends of the first electrode 13 and the follower, the second electrode 14 is grounded, the output end of the follower is connected with one channel of the analog quantity interface, and in the embodiment, the power supply VmIs 5V, a voltage-dividing resistor R0Is 10M omega, the follower is realized by a CA3140 operational amplifier, and the output voltage of the follower is set as V1The resistance R of the solid 5x=V1R0/(Vm-V1)。
The corresponding relation between the resistance of the solid 5 and the water content is obtained in advance through experiments, and the water content of the solid 5 can be measured by measuring the resistance of the solid 5.
As shown in figure 6, the displacement measuring circuit depends on the displacement sensor used, and comprises a follower, and the terminal 6-3 on the displacement sensor is connected with a power supply VmIn the embodiment, the follower is realized by a CA3140 operational amplifier.
The displacement measurement circuit measures the fixed water content according to the movement of the electrode displacement measurement mechanism: the displacement sensor ejector rod 6-1 is connected with the sliding end of the displacement sensor potentiometer 6-2, the movement of the displacement sensor ejector rod 6-1 drives the sliding end of the displacement sensor potentiometer 6-2 to move, so that the output voltage of the displacement sensor middle terminal 6-4 is changed, the voltage is zero, the displacement sensor ejector rod 6-1 is positioned at one end of the working stroke, and the voltage is equal to VmIndicating that the displacement sensor top rod 6-1 is at the other end of the working stroke, the displacement of the sensor top rod 6-1 and the output voltage of the sensor middle terminal 6-4 (equal to the output voltage of the follower)Pressure V2) Linear relation, assuming that the measuring range of the displacement sensor 7 is L, the displacement of the displacement sensor top rod 6-1 is x = V2L/Vm。
The corresponding relation between the water content of the solid 5 and the maximum displacement of the electrodes 13 and 14 under constant pressure is obtained in advance through experiments, and the water content of the solid 5 can be measured by measuring the maximum displacement of the first electrode 13 and the second electrode 14.
In addition, in the embodiment, the air cylinder 3 is a double-acting air cylinder, the air valve is a two-position five-way electromagnetic valve correspondingly, and the alarm is a 220V audible and visual alarm. The computer adopts an STC15F2K60S2 singlechip; the switching value interface uses P0, P2 and P3 ports of the single chip microcomputer, and an output driving circuit (a solid-state relay) is added to connect the gas valve and the alarm; the analog quantity interface directly uses an A/D converter (pins P1.0-P1.7) on a single chip; the display is an LCD1602 liquid crystal display. A pair of contacts of the travel switch 15 is connected with a computer through a switching value interface, the computer controls the on-off of the air valve power supply through the switching value interface, and the lifting of the first electrode 13 and the second electrode 14 is controlled through the air cylinder 3; when the control system 16 detects that the water content of the solid 5 exceeds a set value or the device for rapidly measuring the water content of the solid breaks down, the computer is connected with the power supply of the alarm through the switching value interface to alarm.
The invention adopts the device for rapidly measuring the solid water content to measure the solid water content, and particularly relates to a method for rapidly measuring the solid water content, which mainly comprises the following steps:
step 2, the control system 16 circularly detects the signal of the travel switch 15, controls the electrode driving mechanism to stop driving the first electrode 13 and the second electrode 14 to descend at the moment when the signal is in a conversion state, changes the driving state into the driving state that the first electrode 13 and the second electrode 14 are driven to ascend, and simultaneously collects the signal of the moisture content measuring circuit and the signal of the displacement measuring circuit;
and 4, continuing to control the electrode driving mechanism to drive the first electrode 13 and the second electrode 14 to ascend until the first electrode 13 and the second electrode 14 return to the initial positions, and stopping driving the first electrode 13 and the second electrode 14 to ascend.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. A device for rapidly measuring the water content of solid is characterized by comprising two electrodes, an electrode driving mechanism, an electrode pressure detection mechanism, an electrode displacement measurement mechanism and a control system; the two electrodes are arranged on the electrode driving mechanism, the bottom surfaces of the two electrodes are parallel to a plane for placing a solid, and the two electrodes and the electrode driving mechanism are positioned above the solid; the electrode driving mechanism comprises a linear motion driving mechanism, a connecting plate, an electrode mounting plate, a spring and a guide pillar; the electrode pressure detection mechanism is used for detecting the pressure when the two electrodes press the solid, the output signal is a switching value, and when the pressure of the electrodes pressing the solid reaches a set value, the state of the output signal changes; the electrode displacement measuring mechanism comprises a displacement sensor, and the displacement sensor directly measures the maximum displacement of the electrodes or indirectly measures the maximum displacement of the two electrodes by measuring the maximum displacement of the connecting plate or the electrode mounting plate; and the control system receives the output signal of the electrode pressure detection mechanism and controls the electrode driving mechanism to drive the electrode to move up and down.
2. The device for rapidly measuring the water content of the solid according to claim 1, wherein the material of the electrode is conductive rubber.
3. The device for rapidly measuring the water content of the solid according to claim 1 or 2, wherein the linear motion driving mechanism comprises a cylinder top plate, and the cylinder top plate can move linearly; the connecting plate is fixed on a cylinder top plate of the linear motion driving mechanism and can linearly move along with the cylinder top plate; one end of the guide post is fixed on the electrode mounting plate, the other end of the guide post penetrates through the hole in the connecting plate and can slide in the hole along the axial direction of the hole, and one end of the guide post, which penetrates through the hole in the connecting plate, is provided with a limiting structure; the spring is positioned between the connecting plate and the electrode mounting plate, and the elastic force of the spring acts on the electrode mounting plate and the connecting plate; the two electrodes are mounted on a lower surface of the electrode mounting plate, and the electrode mounting plate is electrically insulated from the two electrodes.
4. The apparatus for rapidly measuring the water content of the solid according to claim 1 or 2, wherein the electrode pressure detecting mechanism comprises a travel switch, and the travel switch is mounted on the connecting plate or the electrode mounting plate and located between the connecting plate and the electrode mounting plate, and the mounting position of the travel switch is such that the output state of the travel switch is changed when the force of the two electrodes pressing against the solid reaches a set value.
5. The device for rapidly measuring the water content of the solid according to claim 1 or 2, wherein the control system comprises a computer, a switching value interface, an analog value interface, a water content measuring circuit, a displacement measuring circuit and an indicating device; the output of the electrode pressure detection mechanism is connected to the switching value interface; the moisture content measuring circuit comprises a divider resistor and a follower, one end of the divider resistor is connected with a power supply, the other end of the divider resistor is connected with the input of one electrode and the input of the follower, the other electrode is grounded, and the output of the follower is connected with one channel of the analog quantity interface; and the output of the displacement measuring circuit is connected with the other channel of the analog quantity interface.
6. A method for rapidly measuring the water content of solid, which is characterized in that the water content of the solid is measured by the device for rapidly measuring the water content of the solid according to claim 5.
7. The method for rapidly measuring the water content of the solid according to claim 6, which is characterized by comprising the following steps:
step 1, the two electrodes are initially positioned at a position slightly higher than the solid, and the control system controls the electrode driving mechanism to drive the electrodes to descend;
step 2, the control system circularly detects signals of the electrode pressure detection mechanism, controls the electrode driving mechanism to stop driving the two electrodes to descend when detecting that the pressure of the two electrodes reaches a set value, drives the two electrodes to ascend instead, and simultaneously collects signals of a water content measurement circuit and signals of a displacement measurement circuit;
step 3, calculating the water content H1 of the solid according to the signal of the water content measuring circuit, calculating the water content H2 of the solid according to the signal of the displacement measuring circuit, and alarming through an indicating device when H1 and H2 both exceed the normal measuring range; when only H1 exceeded the normal measurement range, H2 was used as the measurement result; when only H2 exceeded the normal measurement range, H1 was used as the measurement result; when neither H1 nor H2 exceeded the normal measurement range, (H1+ H2)/2 was used as the measurement result;
the measurement result is output through an indicating device;
and 4, continuously controlling the electrode driving mechanism to drive the two electrodes to ascend until the two electrodes return to the initial positions, and stopping driving the two electrodes to ascend.
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| CN201810665518.5A CN108593716B (en) | 2018-06-26 | 2018-06-26 | Device and method for rapidly measuring solid water content |
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| CN201810665518.5A CN108593716B (en) | 2018-06-26 | 2018-06-26 | Device and method for rapidly measuring solid water content |
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| CN109342750A (en) * | 2018-11-22 | 2019-02-15 | 四川省久益生物肥料有限公司 | Device for detecting water content is used in a kind of processing of organic fertilizer |
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| CN206583789U (en) * | 2017-03-20 | 2017-10-24 | 甘肃农业大学 | A kind of potato tubers rapid determination of water content instrument |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| FR3034194B1 (en) * | 2015-03-24 | 2017-03-24 | Tecsan | METROLOGY DEVICE AND ASSOCIATED METHOD |
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| DE2608651A1 (en) * | 1976-03-03 | 1977-09-15 | Toni Reifenhaeuser | Quantitative determination of flesh and fat in mixt. - using mass pressed to definite dimensions, as electrical resistance |
| CN201016907Y (en) * | 2007-03-19 | 2008-02-06 | 岳辉 | Compression type meat water content detecting instrument |
| CN201488967U (en) * | 2009-03-24 | 2010-05-26 | 南京林业大学 | On-line detecting device for water content of floor board |
| CN202049128U (en) * | 2011-01-17 | 2011-11-23 | 韩刚 | Multipolar type cotton moisture tester |
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