CN108801911A - The method that deflection by measuring solid measures its moisture content - Google Patents
The method that deflection by measuring solid measures its moisture content Download PDFInfo
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- CN108801911A CN108801911A CN201811017705.9A CN201811017705A CN108801911A CN 108801911 A CN108801911 A CN 108801911A CN 201811017705 A CN201811017705 A CN 201811017705A CN 108801911 A CN108801911 A CN 108801911A
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- 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
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Abstract
The present invention relates to a kind of methods that the deflection by measurement solid measures its moisture content, include the following steps：1：Control first electrode and second electrode are moved synchronously with solid, and first electrode and second electrode is made to be located at the surface of solid；2：Control first electrode and second electrode move downward；3：T at the time of detecting first electrode and second electrode contact solid1, start counting up the number of the pulse signal of coordination electrode driving mechanism motor rotation；4：The t at the time of power that detection first electrode and second electrode press to solid reaches preset value2, stop first electrode and second electrode decline, stop the number of the pulse signal of tally control electrode drive mechanism motor rotation；5：Calculate the moisture content of solid；6：Coordination electrode driving mechanism returns to original position；7：Controlled level slide unit returns to original position.The method that the deflection by measuring solid of the present invention measures its moisture content can be realized carries out on-line measurement to the moisture content of solid on production line.
Description
Technical field
The present invention relates to a kind of methods that the deflection by measurement solid measures its moisture content.
Background technology
The moisture content of solid can influence its quality and storage, especially for the object of food one kind, such as bean vermicelli cake.So
And currently, when producing in enormous quantities, can only use and detect the moisture content of solid by the way of inspecting by random samples, due on production line after drying
Solid inside and outside moisture content it is inconsistent, be typically only capable to use dehydration mensuration, i.e., by drying so that solid is dried out, with mistake
The quality divided by initial mass of the moisture gone obtain moisture content, and time of measuring is very long, very unfavorable for the quality control of product,
There is an urgent need to a kind of device and method for capableing of on-line measurement solid aqueous rate in production.Compared to the patent (patent No.：
2018109759843) how measurement method explores the new way for measuring solid aqueous rate, obtains more accurate measurement accuracy,
It is exactly one of this patent technical problems to be solved.
Invention content
The present invention in view of the deficiency of the prior art, using with the patent (patent No.：2018109759843) identical
Device, a kind of deflection method for measuring its moisture content by measuring solid is provided.
Technical proposal that the invention solves the above-mentioned problems is as follows：
Patent (the patent No. used by method：2018109759843) device described in is as follows：
A kind of device of on-line measurement solid aqueous rate, including detection device holder, electrode mechanism, electrode drive mechanism,
Horizontal sliding table, solid detection switch and control system.
The solid passes through transmission mechanism horizontal transport.
The electrode mechanism includes two electrodes of mutually insulated：First electrode and second electrode, the first electrode and
The bottom surface of second electrode is aligned, and is parallel to the plane that transmission mechanism places the solid, the first electrode and the second electricity
Pole uses conductive material, such as red copper, stainless steel, is both connected to the control system.
The electrode drive mechanism includes electrode drive mechanism motor, electrode drive rotation change straight-line motion mechanism, electrode
Driving mechanism guide rail, the first sliding block, the second sliding block, the first sliding block connector, the second sliding block connector, limited post, electrode drive
Mechanism spring, electrode drive mechanism zero position switch, electrode drive mechanism base and pressure detection switch.
The electrode drive mechanism motor is the motor of pulse signal control, such as stepper motor or AC servo motor, institute
State the computer that electrode drive mechanism motor is connected to by motor driver in the control system.
The electrode drive mechanism motor and electrode drive mechanism guide rail are fixedly mounted on the electrode drive mechanism
On pedestal, the plane of the solid is placed in the direction of electrode drive mechanism guide rail perpendicular to transmission mechanism.
It includes electrode drive mechanism shaft coupling, electrode drive mechanism leading screw that the electrode drive rotation, which becomes straight-line motion mechanism,
With coupled electrode drive mechanism nut, electrode drive mechanism leading screw is fixed on electrode drive mechanism base by bearing
On, axis is parallel with the axis of electrode drive mechanism guide rail, and electrode drive mechanism leading screw passes through electrode drive mechanism shaft coupling
It being connected on the output shaft of electrode drive mechanism motor, electrode drive mechanism nut is fixed on first sliding block, and described
One sliding block is mounted on electrode drive mechanism guide rail, can be slided along electrode drive mechanism guide rail.
Electrode drive rotation becomes straight-line motion mechanism and the angular displacement of the electrode drive mechanism motor is changed into the
Straight-line displacement of one sliding block along electrode drive mechanism guide rail.
Second sliding block is located at the lower section of the first sliding block, is also mounted on electrode drive mechanism guide rail, can be driven along electrode
Motivation structure guide rail slides, and the first sliding block connector and the connection of the second sliding block is fixedly mounted respectively on the first sliding block and the second sliding block
Part, along the side for being parallel to electrode drive mechanism guide rail between the first sliding block connector and the second sliding block connector
To installation limited post and electrode drive mechanism spring, electrode drive mechanism spring realize the first sliding block connector and
The flexible connection of second sliding block connector, effect are first in the electrode mechanism for making the second sliding block connector lower end be connected
Electrode and second electrode are contacted with solid flexible to be detected below, and provide a lasting pressure；The limited post is used for
The maximum distance between the first sliding block connector and the second sliding block connector is limited, to which the electrode drive machine can also be limited
The initial deformation amount of structure spring shortens time of measuring to reduce the impulse stroke of the first sliding block；Second sliding block and second
Sliding block connector can be under electrode drive mechanism spring and limited post effect with described in the first sliding block and the first sliding block connector edge
Electrode drive mechanism guide rail linear motion.
The electrode mechanism is fixedly installed in the downside of the second sliding block connector, can be with the second sliding block connector and
Two sliding blocks are moved along electrode drive mechanism guide rail together.
Pressure is installed between first sliding block or the first sliding block connector and the second sliding block or the second sliding block connector
Detection switch, the pressure detection switch can be fixedly mounted on the first sliding block, the first sliding block connector, the second sliding block and second and slide
On block connector is one of arbitrary, for detecting the relative displacement between the first sliding block connector and the second sliding block connector
Amount, to detect the deflection and elastic force of electrode drive mechanism spring, installation site should ensure that when first electricity
When the power that pole and second electrode press to the solid reaches setting value, the output state of the pressure detection switch changes.
The pressure detection switch can be mechanical stroke switch, optoelectronic switch, capacitive approach switch or inductance type
Close to switch.
The output of the pressure detection switch is connected to the control system.When measuring every time, the control system control
The electrode drive mechanism drives the first electrode and second electrode to move downward, and first electrode and second electrode is made to be pressed onto institute
It states on solid, while detecting the output of the pressure detection switch, when the output state of pressure detection switch changes, stop the
One electrode and second electrode move downward.
The use of the pressure detection switch realizes the power that the solid is pressed to the first electrode and second electrode
Detection, it is simply, reliably, at low cost.
Electrode drive mechanism zero position switch is used to detect the zero shift point of the straight-line displacement of first sliding block, in institute
State the first sliding block laterally moved approach electrode drive mechanism zero position switch and leads to the electrode drive mechanism zero under
At the time of saltus step occurs for the output signal of bit switch, first sliding block is in zero shift point, electrode drive mechanism zero-bit
Switch is fixedly mounted on electrode drive mechanism base.
Electrode drive mechanism zero position switch can be mechanical stroke switch, optoelectronic switch, capacitive approach switch
Or inductance approach switch.
The horizontal sliding table include horizontal sliding table motor, horizontal sliding table rotation become straight-line motion mechanism, horizontal sliding table guide rail,
Horizontal sliding table sliding block, horizontal sliding table zero position switch and horizontal sliding table pedestal.
The horizontal sliding table motor is the controllable motor of speed, such as stepper motor or AC servo motor or DC servo electricity
Machine, the horizontal sliding table motor are connected to the computer in the control system by motor driver.
The horizontal sliding table motor and horizontal sliding table guide rail are fixedly installed on horizontal sliding table pedestal, the horizontal sliding table
The direction for being oriented parallel to transmission mechanism and conveying the solid of guide rail, the horizontal sliding table pedestal are fixedly mounted on the detection
On appliance stand, it is located at the top of the transmission mechanism.
Horizontal sliding table rotation become straight-line motion mechanism include horizontal sliding table shaft coupling, horizontal sliding table leading screw and with its coupling
The horizontal sliding table nut of conjunction, horizontal sliding table leading screw are fixed on by bearing on horizontal sliding table pedestal, and axis is led with horizontal sliding table
The axis of rail is parallel, and horizontal sliding table leading screw is connected to by horizontal sliding table shaft coupling on the output shaft of the horizontal sliding table motor,
Horizontal sliding table nut is fixed on the horizontal sliding table sliding block, and the horizontal sliding table sliding block is mounted on the horizontal sliding table guide rail
On, it can be slided along the horizontal sliding table guide rail.
The horizontal sliding table rotation becomes straight-line motion mechanism and the angular displacement of the horizontal sliding table motor is changed into horizontal cunning
Straight-line displacement of the platform sliding block along the horizontal sliding table guide rail.
The horizontal sliding table zero position switch is fixedly installed on horizontal sliding table pedestal or detection device holder, for detecting
The zero shift point for stating the straight-line displacement of horizontal sliding table sliding block, in the horizontal sliding table sliding block from the front in the solid transmission direction
(direction of the solid transmission is forward) moves backward the approach horizontal sliding table zero position switch and leads to the horizontal sliding table
At the time of saltus step occurs for the output signal of zero position switch, the horizontal sliding table sliding block is in zero shift point.
The horizontal sliding table zero position switch can be mechanical stroke switch, optoelectronic switch, capacitive approach switch or electricity
The close switch of sense formula.
The electrode drive mechanism base is fixedly mounted on described horizontal sliding directly or by electrode drive mechanism connecting plate
On platform sliding block.
The detection device holder is mounted on measure field, and position should ensure that the first electrode and second electrode are located at
The top for the solid that the transmission mechanism is transmitted, and when not measuring not with the solid contact.
It is horizontal during the first electrode and second electrode press to the solid, stop and leave the solid
Slide unit drives the first electrode and second electrode synchronous with the detected solid on the direction that the transmission mechanism moves
Movement, does not influence the transmission of the solid.
The solid detection switch is fixedly mounted on the transmission mechanism holder or on detection device holder, is located at described
The rear of first electrode and second electrode, i.e., the described solid first pass through solid detection switch, then just reach the first electrode
With the lower section of second electrode；In the transmission direction along the transmission mechanism, the solid detection switch and the first electrode
It is slightly larger than the maximum sized half of the solid with the distance at the center of second electrode, the installation of the solid detection switch is high
Degree must guarantee to detect the solid.
The solid detection switch is used to detect arriving and departing from for the solid on transmitting device, when the solid reaches
Or when leaving the test position of solid detection switch, the output state of solid detection switch changes.The solid detection switch can
Can also be capacitive approach switch or inductance to be optoelectronic switch, including correlation optoelectronic switch and reflective photoelectric switch
The close switch of formula.
Preferably, the solid detection switch switchs for laser photoelectricity, i.e., illuminating source is the optoelectronic switch of laser.Due to
The monochromaticjty of laser is good, and light beam is thin, intensity is high, is particularly suitable for detecting the smaller solid, in addition, the influence of ambient light
It is smaller.
The solid detection switch is connected to the control system, and the control system receives the solid detection switch
Signal controls the first electrode and second electrode and is accurately pressed onto on the solid.
The control system includes computer, resistance measuring circuit, two motor drivers and display.The resistance is surveyed
Amount circuit, which includes a divider resistance and a follower, the follower, to be realized by operational amplifier, the divider resistance
One termination power, the input of another the termination first electrode and follower, the second electrode ground connection, the output of follower connect
To the computer；The solid detection switch, pressure detection switch, horizontal sliding table zero position switch, electrode drive mechanism zero-bit
Switch is connected to the computer；The control terminal of two motor drivers is connected to the computer, and the other end distinguishes receiving electrode
Driving mechanism motor and horizontal sliding table motor；The display also connects the computer, for showing measurement result.
When use with the patent (patent No.：2018109759843) device described in difference lies in, when measuring every time, institute
State control system and control the electrode drive mechanism and the first electrode and second electrode is driven to move downward, make first electrode and
Second electrode is pressed onto on the solid, while detecting the output of the pressure detection switch, when the output shape of pressure detection switch
When state changes, stops first electrode and second electrode moves downward,
At this point, control system need not detect the resistance of solid between first electrode and second electrode to measure the solid
Moisture content.
The measuring principle of the method for the present invention is as follows,
For some kinds of solid, at the same pressure, deflection is different for the solid of different water cut, leads to
Often, the low deformation of moisture content is small, and the deformation of moisture content height is big, and solid deflection at the same pressure and its are found out by experiment
Moisture content and between relationship, you can measure its moisture content by detecting the deflection of the solid at the same pressure.
For example, bean vermicelli cake of the moisture content between 10% to 14% has this characteristic, in production practices, worker is frequent
Bean vermicelli cake is pressed with hand to judge its moisture content height, but this artificial measurement method and inaccurate, fully rely on worker
Experience and get sth into one's head.
The present invention detects the mode of bean vermicelli cake moisture content, and solid to be detected is pressed with the electrode of two mutually insulateds.
The solid whether can be touched with detecting electrode with two electrodes, before contacting the solid, between two electrodes
It is insulation, theoretically resistance is infinity, and after touching the solid, resistance becomes finite value, and specific size depends on waiting for
Detect solid and its minimum moisture content.
It depresses and lifts using motor drive mechanism band moving electrode, the motor drive mechanism is driven using the motor that pulse signal controls
It is dynamic, in order to calculate the stroke of the motor drive mechanism by counting the number of the pulse signal.
Spring is set between the motor drive mechanism and electrode, flexible pressing, spring are carried out to the solid by spring
Deflection determine pressure of the electrode to the solid, the electrode is detected to described by the deflection of detection spring
Whether the pressure of solid reaches preset value.
When electrode is depressed every time, after detecting that electrode touches the solid, of the pulse signal is started counting up
Number stops pressure after the deflection for detecting spring reaches preset value, and stops counting, according to the pulse number meter counted
Calculate the pressure distance of the electrode, i.e., the deflection of the described solid.
It is open circuit between first electrode and second electrode before the first electrode and second electrode contact the solid
, insulation resistance of the resistance between the first electrode and second electrode between them；And when the first electrode and the
When two electrodes touch the solid within the scope of certain moisture content, the resistance between them can be significantly different, specifically
Moisture content of the value depending on the solid.
During electrode drive mechanism drives the first electrode and second electrode declines, cycle detection first electrode
Resistance between second electrode, when detecting that the resistance is significantly less than the insulation resistance between first electrode and second electrode
When, judge that first electrode and second electrode touch the solid, remembers that the moment is t1。
The power that the first electrode and second electrode press to the solid reaches as described pressure inspection at the time of setting value
At the time of the output state of slowdown monitoring switch changes, remember that the moment is t2。
In period { t:t1≤t<t2In, on the direction of first electrode and second electrode along electrode drive mechanism guide rail
Displacement d be equal to the solid deflection.
The electrode mechanism is fixedly mounted on the second sliding block connector, so, in period { t:t1≤t<t2In, the
One electrode and second electrode are equal to the displacement of the second sliding block connector along the displacement d in the direction of electrode drive mechanism guide rail
d2。
Second sliding block connector is connected to by electrode drive mechanism spring and limited post on the first sliding block connector, every time
When measurement, in period { t:t1≤t<t2In, the relative deformation of electrode drive mechanism spring is identical, that is,
It says, the relative displacement of the second sliding block connector and the first sliding block connector is identical, remembers that the relative displacement is dS, which can thing
First measure.
First sliding block connector is fixed on the first sliding block, in period { t:t1≤t<t2In, displacement d1It can lead to
Cross the number N that the counting control system in the period controls the pulse signal of the electrode drive mechanism motor rotationPInto
Row detection remembers that the first sliding block corresponding to a pulse signal is along the displacement in the direction of electrode drive mechanism guide rail
δ, then d1=NP*δ。
To sum up, in period { t:t1≤t<t2In, the deflection of the solid is：
D=d2=d1–dS=NP*δ-dS。
In above formula, δ and dSIt is constant, therefore, d and NPBetween there are linear relationships.
In order to detect the moisture content of solid by measuring the deflection of the solid, before starting measurement, first into rower
Fixed experiment, obtains period { t:t1≤t<t2In control system control the pulse signal of electrode drive mechanism motor rotation
Number NPWith the correspondence of the moisture content H of solid：H=f (NP)。
Rating test is fitted to obtain NPRelationship between H：H=k*NP+ b, k and b is calibration coefficient in formula.
A kind of deflection method for measuring its moisture content by measuring solid according to the present invention, using it is above-mentioned
The device that line measures solid aqueous rate measures.
Measurement process specifically includes following steps：
Step 1：The signal of solid detection switch described in control system cycle detection, when detecting the solid detection switch
Second of saltus step of output when, through delay, control the horizontal sliding table and drive electrode drive mechanism mounted thereto and electrode
Mechanism starts to move along the direction that the transmission mechanism moves, and so that the first electrode and second electrode is located at detected described
The surface of solid, and moved synchronously opposing stationary along the direction that transmission mechanism moves with the solid；
Step 2：The control system controls the electrode drive mechanism and drives the first electrode and second electrode downward
Movement；
Step 3：Resistance between control system cycle detection first electrode and second electrode, when detecting that the resistance is apparent
When less than insulation resistance between first electrode and second electrode, starts counting up control system and control the electrode drive mechanism motor
The number of the pulse signal of rotation remembers that the moment is t1；
Step 4：The signal of pressure detection switch described in control system cycle detection, when detecting the defeated of pressure detection switch
Do well change when, control the electrode drive mechanism and stop that the first electrode and second electrode is driven to decline, stop counting
Control system controls the number of the pulse signal of the electrode drive mechanism motor rotation, remembers that the moment is t2；
Step 5：Remember period { t:t1≤t<t2In control system control the pulse of electrode drive mechanism motor rotation
The number of signal is NP, calculate the moisture content H=f (N of the solidP), and measurement result is shown over the display；
Step 6：Control system controls the electrode drive mechanism and the first electrode and second electrode is driven to rise, until
The output signal of electrode drive mechanism zero position switch generates saltus step, and control system controls the electrode drive mechanism and stops fortune
It is dynamic；
Step 7：Control system controls the movement that the horizontal sliding table stops the direction being moved along transmission mechanism, is changed to control
Horizontal sliding table processed is moved along the negative direction that transmission mechanism moves, until the output signal of the horizontal sliding table zero position switch generates
Saltus step, control system control the horizontal sliding table stop motion.
It is using the advantageous effect of above-mentioned technical proposal：It can ensure that the first electrode and second electrode are accurately pressed onto institute
State solid, ensure that measurement process does not influence the transmission of the solid, herein under the premise of, measuring section { t:t1≤t<t2In control
System processed controls the number of the pulse signal of the electrode drive mechanism motor rotation, to accurately measure the moisture content of solid.
Since the pressure of the first electrode and second electrode acts on the solid entirety when measuring, according to upper
State technical solution measure obtained solid moisture content be the solid overall moisture content, including surface layer and inside.
The method that the deflection by measuring solid of the present invention measures its moisture content is aqueous with its using the intensity of solid
The different characteristic of rate provides a kind of new approach for measuring solid aqueous rate, with the patent (patent No.：2018109759843)
The method is compared, and this method is suitable for intensity and the good solid of aqueous rate dependence, such as bean vermicelli cake, also, is contained in certain
Within the scope of water rate, the intensity of solid is more notable with the characteristic of its water-cut variation, and higher measurement can be obtained using this method
Precision.For example, with the patent (patent No.：2018109759843) embodiment 1 compares, in an embodiment of the present invention, for
The measurement result of bean vermicelli cake of the moisture content between 10%-14%, this method has smaller measured deviation.
Description of the drawings
Fig. 1 is the totality of the device for the on-line measurement solid aqueous rate being mounted in the embodiment of the present invention on transmitting device
The schematic diagram of structure.
Fig. 2 and Fig. 3 is the schematic diagram of the structure of horizontal sliding table in the embodiment of the present invention.
Fig. 4 is the schematic diagram of the structure of electrode drive mechanism in the embodiment of the present invention.
Fig. 5 is the schematic diagram of the partial structurtes of electrode drive mechanism in the embodiment of the present invention.
Fig. 6 is the schematic diagram of the structure of electrode mechanism in the embodiment of the present invention.
Fig. 7 is the schematic diagram of resistance measuring circuit in the embodiment of the present invention.
Fig. 8 is the structural schematic diagram of control system in the embodiment of the present invention.
Fig. 9 is the measuring principle schematic diagram of the deflection of solid in the embodiment of the present invention, and what Fig. 9 (a) was indicated is first
At the time of electrode and second electrode have just contacted the solid, what Fig. 9 (b) was indicated is that the output state of the pressure detection switch changes
At the time of change.
In attached drawing 1-9, the parts title represented by each label is listed as follows：1, transmission mechanism, 2, detection device branch
Frame, 3, horizontal sliding table, 4, electrode drive mechanism, 5, electrode mechanism connecting pole, 6, electrode mechanism, 7, solid, 8, solid detection opens
It closes, 9, control system.
1-1, transmission mechanism motor, 1-2, transmission mechanism holder, 1-3, transmission mechanism conveyer belt, 1-4, transmission mechanism transmission
Band support plate.
3-1, horizontal sliding table motor, 3-2, horizontal sliding table leading screw, 3-3, horizontal sliding table sliding block, 3-4, horizontal sliding table guide rail,
3-5, electrode drive mechanism connecting plate, 3-6, horizontal sliding table zero position switch, 3-7, horizontal sliding table pedestal, 3-8, horizontal sliding table shaft coupling
Device, 3-9, horizontal sliding table nut, 3-10, horizontal sliding table zero position switch holder.
3-7-1, horizontal sliding table base plate, 3-7-2, horizontal sliding table chassis left side plate, in 3-7-3, horizontal sliding table pedestal
Between plate, 3-7-4, horizontal sliding table pedestal right plate.
4-1, electrode drive mechanism motor, 4-2, electrode drive mechanism shaft coupling, 4-3, electrode drive mechanism leading screw, 4-4,
Electrode drive mechanism nut, 4-5, the first sliding block, 4-6, electrode drive mechanism guide rail, 4-7, electrode drive mechanism base, 4-8,
Electrode drive mechanism zero position switch, 4-9, electrode drive mechanism zero position switch holder, 4-10, the first sliding block connector, 4-11,
Two sliding blocks, 4-12, the second sliding block connector, 4-13, limited post, 4-14, electrode drive mechanism spring, 4-15, pressure detecting are opened
It closes, 4-16, pressure detection switch holder.
4-7-1, electrode drive mechanism base bottom plate, 4-7-2, electrode drive mechanism base epipleural, 4-7-3, electrode drive
Dynamic mechanism base intermediate plate, 4-7-4, electrode drive mechanism base lower side panel.
4-10-1, first the first side plate of sliding block connector, 4-10-2, first the second side plate of sliding block connector.
4-12-1, the second sliding block connector groove bottom, cell wall on 4-12-2, the second sliding block connector, 4-12-3, the second sliding block
Cell wall under connector.
6-1, first electrode, 6-2, second electrode, 6-3, electrode mounting plate.
Specific implementation mode
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the present invention.Direction illustrates in this example：The direction that solid 7 transmits is forward, with transmission direction phase
After anti-direction is；Also, according to setting position in figure in attached drawing 1-9, the left and right is direction from left to right.
As Figure 1-Figure 8, the device of on-line measurement solid aqueous rate of the invention includes detection device holder 2, electrode
Mechanism 6, electrode drive mechanism 4, horizontal sliding table 3, electrode mechanism connecting pole 5, solid detection switch 8 and control system 9.
As shown in Figure 1, solid 7 (being bean vermicelli cake in the present embodiment) to be detected passes through 1 horizontal transport of transmission mechanism, conveyer
Structure 1 includes transmission mechanism motor 1-1, transmission mechanism holder 1-2, transmission mechanism conveyer belt 1-3 and the support of transmission mechanism conveyer belt
Plate 1-4, transmission mechanism motor 1-1 drive transmission mechanism conveyer belt 1-3 along arrow direction shown in FIG. 1, transmission mechanism
Carousel support plate 1-4 provides support from the lower section of transmission mechanism conveyer belt 1-3 to it.
As shown in figures 1 to 6, electrode mechanism 6 includes first electrode 6-1, second electrode 6-2 and electrode mounting plate 6-3, the
One electrode 6-1 and second electrode 6-2 is in rectangular shape, and bottom surface is aligned, and is parallel to the upper table of transmission mechanism conveyer belt 1-3
Respectively there are two the threaded holes of vertical direction for system on the top of face, first electrode 6-1 and second electrode 6-2, electric by first by screw
Pole 6-1 and second electrode 6-2 is fixed on the downside of electrode mounting plate 6-3, the side of first electrode 6-1 and second electrode 6-2's
Side is mutually parallel, and the mounting hole of vertical direction is also formed on electrode mounting plate 6-3, by electrode mechanism connecting pole 5 by electrode
Mechanism 6 is fixed in electrode drive mechanism 4.
First electrode 6-1 and second electrode 6-2 are made using conductive material, such as red copper and stainless steel；Electrode is installed
Plate 6-3 uses bakelite plate (phenoplasts laminate), realizes the electric insulation between first electrode 6-1 and second electrode 6-2.
As shown in Figure 4 and Figure 5, electrode drive mechanism 4 is straightened including electrode drive mechanism motor 4-1, electrode drive rotation
Line movement mechanism, electrode drive mechanism guide rail 4-6, the first sliding block 4-5, the second sliding block 4-11, the first sliding block connector 4-10,
Two sliding block connector 4-12, limited post 4-13, electrode drive mechanism spring 4-14, electrode drive mechanism zero position switch 4-8, electrode
Driving mechanism pedestal 4-7 and pressure detection switch 4-15.
Electrode drive mechanism motor 4-1 is stepper motor.
Electrode drive mechanism base 4-7 includes the electrode drive mechanism base bottom plate 4-7-1 that a block length side is placed vertically, also
Including the electrode drive mechanism base epipleural 4-7-2 being horizontally mounted and electrode drive mechanism base lower side panel 4-7-4, further include
One piece of angular electrode drive mechanism base intermediate plate 4-7-3, electrode drive mechanism base epipleural 4-7-2 and electrode drive machine
Structure Its lower side plate 4-7-4 is separately fixed at the upper and lower ends of electrode drive mechanism base bottom plate 4-7-1, electrode drive mechanism bottom
Seat intermediate plate 4-7-3 is fixed on by its side plate on electrode drive mechanism base bottom plate 4-7-1, close to electrode drive mechanism base
The upper end of bottom plate 4-7-1, another side plate are in horizontal direction.
Electrode drive mechanism motor 4-1 is fixed on the top of electrode drive mechanism base epipleural 4-7-2, and output shaft is perpendicular
Direct puncture crosses the hole among electrode drive mechanism base epipleural 4-7-2, and cylindrical electrode driving mechanism guide rail 4-6 is fixed on electrode
On driving mechanism pedestal epipleural 4-7-2 and electrode drive mechanism base lower side panel 4-7-4, electrode drive mechanism guide rail 4-6's
Direction is perpendicular to the upper surface of transmission mechanism conveyer belt 1-3.
It includes electrode drive mechanism shaft coupling 4-2, electrode drive mechanism that the electrode drive rotation, which becomes straight-line motion mechanism,
Leading screw 4-3 and coupled electrode drive mechanism nut 4-4, electrode drive mechanism leading screw 4-3 are fixed on by two bearings
In hole on the larger side plate and electrode drive mechanism base lower side panel 4-7-4 of electrode drive mechanism base intermediate plate 4-7-3,
And it is connected on the output shaft of electrode drive mechanism motor 4-1 by electrode drive mechanism shaft coupling 4-2, electrode drive mechanism connection
Axis device 4-2 is located at the larger side of electrode drive mechanism base epipleural 4-7-2 and electrode drive mechanism base intermediate plate 4-7-3
Between plate, electrode drive mechanism nut 4-4, which is fixed on the first sliding block of cuboid 4-5, vertically runs through the first sliding block 4-
In the hole of 5 centre, the first sliding block 4-5 is straight by the hole and two for vertically running through the both sides of the first sliding block 4-5 thereon
Spool is held on electrode drive mechanism guide rail 4-6, can be slided along electrode drive mechanism guide rail 4-6, electrode drive mechanism electricity
Machine 4-1 drives electrode drive mechanism leading screw 4-3 rotations, and then drives the electrode drive coupled with electrode drive mechanism leading screw 4-3
Mechanism nut 4-4 and the first sliding block 4-5 or more linear movements.
Second sliding block 4-11 of rectangular shape is located at the lower section of the first sliding block 4-5, and position is formed with vertical side therebetween
It is passed freely through to through-hole power pole driving mechanism leading screw 4-3, the second sliding block 4-11 also by vertically running through second thereon
The hole of the both sides of sliding block 4-11 and two linear bearings are mounted on electrode drive mechanism guide rail 4-6, can be along electrode drive mechanism
Guide rail 4-6 slidings, angular first sliding block connector 4-10 are fixed on first by first the first side plate of sliding block connector 4-10-1
On sliding block 4-5, plane where first the second side plate of sliding block connector 4-10-2 and the direction of electrode drive mechanism guide rail 4-6 are hung down
Directly, circular hole, flute profile the second sliding block connector 4-12 are fixed on the second cunning by the second sliding block connector groove bottom 4-12-1 thereon
On block 4-11, the plane on the second sliding block connector under cell wall 4-12-2 and the second sliding block connector where cell wall 4-12-3 and electricity
The direction of pole driving mechanism guide rail 4-6 is vertical, also has circular hole on cell wall 4-12-2 on the second sliding block connector, limited post 4-13's
Lower end is fixed on two nuts in the circular hole on the second sliding block connector on cell wall 4-12-2, and limited post 4-13 is upward through
Circular hole on one the second side plate of sliding block connector 4-10-2, can slide up and down in the circular hole, and the upper end is slided for size ratio first
The big turret head of circular hole on the second side plate of block connector 4-10-2, plays the first sliding block connector 4-10 of limitation and the second sliding block
The effect of maximum distance between connector 4-12, the axis of limited post 4-13 are parallel to the axis of electrode drive mechanism guide rail 4-6
Line, electrode drive mechanism spring 4-14 are sleeved on limited post 4-13, are located at first sliding block connector the second side plate 4-10-2 and the
On two sliding block connectors between cell wall 4-12-2.
As shown in Figure 1 and Figure 4, electrode mechanism 6 is fixed on cell wall under the second sliding block connector by electrode mechanism connecting pole 5
In hole on 4-12-3, it is located at the downside of the second sliding block connector 4-12, it can be with the second sliding block connector 4-12 and the second sliding block
4-11 is moved up and down along electrode drive mechanism guide rail 4-6 together.
As shown in Figure 4 and Figure 5, the cell wall 4- on first sliding block connector the second side plate 4-10-2 and the second sliding block connector
Pressure detection switch 4-15 is installed, pressure detection switch 4-15 is switched for mechanical stroke, examined by angular pressure between 12-2
Slowdown monitoring switch holder 4-16 is fixed on first the second side plate of sliding block connector 4-10-2, for detecting the first sliding block connector 4-10
With the relative shift between the second sliding block connector 4-12, to detecting electrode driving mechanism spring 4-14 deflection and bullet
Property power, installation site should ensure that when the power that first electrode 6-1 and second electrode 6-2 press to solid 7 reaches setting value, pressure
The output state of detection switch 4-15 changes.
As shown in figure 4, electrode drive mechanism zero position switch 4-8 is inductance approach switch, for detecting the first sliding block 4-5
Straight-line displacement zero shift point, in the first sliding block 4-5, laterally moved approach electrode drive mechanism zero position switch 4-8 is simultaneously under
At the time of causing its output signal that saltus step occurs, the first sliding block 4-5 is in zero shift point, electrode drive mechanism zero position switch 4-8
It is fixedly mounted on electrode drive mechanism base 4-7 by electrode drive mechanism zero position switch holder 4-9.
As shown in Figures 2 and 3, horizontal sliding table 3 includes horizontal sliding table motor 3-1, horizontal sliding table rotation change straight line fitness machine
Structure, horizontal sliding table guide rail 3-4, horizontal sliding table sliding block 3-3, horizontal sliding table zero position switch 3-6 and horizontal sliding table pedestal 3-7.
Horizontal sliding table motor 3-1 is stepper motor；
Horizontal sliding table pedestal 3-7 includes the horizontal positioned horizontal sliding table base plate 3-7-1 in a block length side, further include erecting
The horizontal sliding table chassis left side plate 3-7-2 and horizontal sliding table pedestal right plate 3-7-4 directly placed, further includes one piece of angular level
Slid platform base intermediate plate 3-7-3, horizontal sliding table chassis left side plate 3-7-2 and horizontal sliding table pedestal right plate 3-7-4 are fixed respectively
In the left and right ends of horizontal sliding table base plate 3-7-1, horizontal sliding table pedestal intermediate plate 3-7-3 is fixed by its smaller side plate
On horizontal sliding table base plate 3-7-1, close to the left end of horizontal sliding table base plate 3-7-1, larger side plate is in perpendicular
Histogram to.
Horizontal sliding table motor 3-1 is fixed on the left side of horizontal sliding table chassis left side plate 3-7-2, and output shaft is horizontal through water
Hole among somoothing board chassis left side plate 3-7-2, cylindrical horizontal slide unit guide rail 3-4 are fixed on horizontal sliding table chassis left side plate 3-
On 7-2 and horizontal sliding table pedestal right plate 3-7-4, the side for being oriented parallel to the movement of transmission mechanism 1 of horizontal sliding table guide rail 3-4
To horizontal sliding table pedestal 3-7 is fixedly mounted on detection device holder 2, is located at the top of transmission mechanism 1.
Horizontal sliding table rotation become straight-line motion mechanism include horizontal sliding table shaft coupling 3-8, horizontal sliding table leading screw 3-2 and
Coupled horizontal sliding table nut 3-9, horizontal sliding table leading screw 3-2 is fixed on horizontal sliding table pedestal intermediate plate by two bearings
In hole on the larger side plate and horizontal sliding table pedestal right plate 3-7-4 of 3-7-3, and connected by horizontal sliding table shaft coupling 3-8
Be connected on the output shaft of horizontal sliding table motor 3-1, horizontal sliding table shaft coupling 3-8 be located at horizontal sliding table chassis left side plate 3-7-2 and
Between the larger side plate of horizontal sliding table pedestal intermediate plate 3-7-3, horizontal sliding table nut 3-9 is fixed on cuboid horizontal sliding table
Run through in the horizontal direction on sliding block 3-3 in the hole of the centre of horizontal sliding table sliding block 3-3, horizontal sliding table sliding block 3-3 passes through its upper edge
Horizontal direction runs through the hole of the both sides of horizontal sliding table sliding block 3-3 and two linear bearings are mounted on horizontal sliding table guide rail 3-4, can
It is slided along horizontal sliding table guide rail 3-4, horizontal sliding table motor 3-1 drives the 3-2 rotations of horizontal sliding table leading screw, and then drives and slided with level
The horizontal sliding table nut 3-9 of platform leading screw 3-2 couplings and the 3-3 linear movements of horizontal sliding table sliding block.
Horizontal sliding table zero position switch 3-6 is inductance approach switch, is fixed by horizontal sliding table zero position switch holder 3-10
It is installed on horizontal sliding table pedestal 3-7, the zero shift point of the straight-line displacement for detection level slide unit sliding block 3-3, it is sliding in level
Platform sliding block 3-3 moves backward approach horizontal sliding table zero-bit from the front (direction that solid 7 transmits is forward) of 7 transmission direction of solid
Switch 3-6 and cause its output signal occur saltus step at the time of, horizontal sliding table sliding block 3-3 is in zero shift point.
As shown in Figure 1-Figure 3, electrode drive mechanism base 4-7 is fixedly mounted on by electrode drive mechanism connecting plate 3-5
On horizontal sliding table sliding block 3-3.
As shown in Figure 1, detection device holder 2 is mounted on measure field, position should ensure that the electricity of first electrode 6-1 and second
Pole 6-2 is located at the top for the solid 7 that transmission mechanism 1 is transmitted, and while not measuring does not contact with solid 7.
As shown in Figure 1, solid detection switch 8 switchs for correlation laser photoelectricity, it includes emitting and receiving two parts, point
It is not fixedly mounted on the transmission mechanism holder 1-2 of the both sides transmission mechanism conveyer belt 1-3, is located at the electricity of first electrode 6-1 and second
The rear of pole 6-2, i.e. solid 7 first pass through solid detection switch 8, then just reach under first electrode 6-1 and second electrode 6-2
Side；In the transmission direction along transmission mechanism 1, the center of solid detection switch 8 and first electrode 6-1 and second electrode 6-2
Distance is slightly larger than the maximum sized half of solid 7, and the mounting height of solid detection switch 8 must guarantee to detect solid 7,
When solid 7 reaches or leaves the test position of solid detection switch 8, the output state of solid detection switch 8 changes.
As shown in Figure 7 and Figure 8, control system 9 includes computer, resistance measuring circuit, two motor drivers and display
Device.The resistance measuring circuit includes a divider resistance R0With a follower, divider resistance R0One termination power Vm, another
The input of first electrode 6-1 and follower, second electrode 6-2 ground connection are terminated, the output of follower is connected to the computer；Solid
Detection switch 8, pressure detection switch 4-15, horizontal sliding table zero position switch 3-6, electrode drive mechanism zero position switch 4-8 are connected to
The computer；The control terminal of two motor drivers is connected to the computer, and the other end distinguishes receiving electrode driving mechanism electricity
Machine 4-1 and horizontal sliding table motor 3-1；The display also connects the computer.
In the present embodiment, power supply VmFor 5V, divider resistance R0Resistance value be 10M Ω, the follower put with CA3140 operations
Big device is realized, if the output voltage of follower is V1, then the resistance R of solid 7x=V1R0/(Vm-V1)。
The computer uses STM32F407ZET6 microcontrollers, it has up to 7 ports I/O, has 16 channels 12
Position ADC (analog-digital converter), the computer respectively use a direction signal and a pulse signal to be driven by two motors
Device coordination electrode driving mechanism motor 4-1 and horizontal sliding table motor 3-1, display select LCD1602, pass through parallel interface and institute
State computer connection.
The method that deflection by measuring solid measures its moisture content, using above-mentioned on-line measurement solid aqueous rate
Device measures.
In the present embodiment, the insulation resistance R between first electrode 6-1 and second electrode 6-2A=31M Ω, as first electrode 6-
When 1 and second electrode 6-2 touches the solid 7 that moisture content is 10%, the resistance R between themB=6.9M Ω, RAAnd RBIn
Between value RCAbout 19M Ω.
Fig. 9 (a) show t at the time of first electrode 6-1 and second electrode 6-2 has just contacted solid 71, Fig. 9 (b) show
The t at the time of output state of pressure detection switch 4-15 changes2, in Fig. 9, d is period { t:t1≤t<t2In solid 7 change
Shape amount is equal in the period on the direction of first electrode 6-1 and second electrode 6-2 along electrode drive mechanism guide rail 4-6
Displacement is also equal to the displacement d of the second sliding block connector 4-12 in the period2；In the period, the connection of the second sliding block
Relative displacement d between part 4-12 and the first sliding block connector 4-10SIt is identical when measuring every time, which corresponds to measures every time
When first electrode 6-1 and second electrode 6-2 press to solid 7 power preset value.
First sliding block connector 4-10 is fixed on the first sliding block 4-5, in period { t:t1≤t<t2In, displacement
d1The pulse signal of 9 coordination electrode driving mechanism motor 4-1 rotations of counting control system in the period can be passed through
Number NPIt is detected, remembers the first sliding block 4-5 corresponding to a pulse signal along electrode drive mechanism guide rail 4-6's
The displacement in direction is δ, then d1=NP*δ。
To sum up, in period { t:t1≤t<t2In, the deflection of solid 7 is：
D=d2=d1–dS=NP*δ-dS。
In above formula, δ and dSIt is constant, therefore, d and NPBetween there are linear relationships.Before starting measurement, carry out first
Calibration experiment obtains period { t:t1≤t<t2In 9 coordination electrode driving mechanism motor 4-1 rotation of control system pulse letter
Number number NPWith the correspondence of the moisture content H of solid 7, such as the powder for moisture content in this example between 10%-14%
Spinning cake, experiment find NPThere are linear relationships between H, and four samples, experiment is taken to measure its (NP, H) data be respectively (3908,
10.70%), (4967,11.51%), (5852,12.16%) and (7971,13.73%), fitting obtain NPPass between H
System：H=k*NP+ b, k and b is calibration coefficient, k=7.51*10 in formula-6, b=0.0776.
Measurement process specifically includes following steps：
Step 1：The signal of 9 cycle detection solid detection switch 8 of control system, when detecting the defeated of solid detection switch 8
When going out second of saltus step, through delay, controlled level slide unit 3 drives electrode drive mechanism 4 mounted thereto and electrode mechanism 6 to open
The begin direction that is moved along transmission mechanism 1 moves, make first electrode 6-1 and second electrode 6-2 be located at be detected solid 7 just on
Side, and moved synchronously opposing stationary along the direction that transmission mechanism 1 moves with solid 7, delay time depends on solid detection
The position of switch 8, the position of first electrode 6-1 and second electrode 6-2, the size of the solid, transmission mechanism conveyer belt 1-3
The acceleration and final speed of speed and horizontal sliding table 3, the delay time value in this example are 1.6 seconds；
Step 2：9 coordination electrode driving mechanism 4 of control system driving first electrode 6-1 and second electrode 6-2 is moved downward；
Step 3：Resistance between control system 9 cycle detection first electrode 6-1 and second electrode 6-2, it is described when detecting
Resistance is less than RCWhen, the number of the pulse signal of 9 coordination electrode driving mechanism motor 4-1 rotations of control system is started counting up, it should
Moment is t1；
Step 4：The signal of 9 cycle detection pressure detection switch 4-15 of control system, when detect its output state change
When, coordination electrode driving mechanism 4 stops driving first electrode 6-1 and second electrode 6-2 declines, and stops counting control system 9 and controls
The number of the pulse signal of electrode drive mechanism motor 4-1 rotations processed, the moment are t2；
Step 5：Remember period { t:t1≤t<t2In 9 coordination electrode driving mechanism motor 4-1 rotation of control system pulse
The number of signal is NP, calculate the moisture content H=k*N of solid 7P+ b, and measurement result is shown over the display；
Step 6：9 coordination electrode driving mechanism 4 of control system drives first electrode 6-1 and second electrode 6-2 to rise, until
The output signal of electrode drive mechanism zero position switch 4-8 generates saltus step, 9 coordination electrode driving mechanism of control system, 4 stop motion；
Step 7：9 controlled level slide unit 3 of control system stops the movement in the direction moved along transmission mechanism 1, is changed to control
Horizontal sliding table 3 processed is moved along the negative direction that transmission mechanism 1 moves, until the output signal of horizontal sliding table zero position switch 3-6 is produced
Raw saltus step, 9 controlled level slide unit of control system, 3 stop motion.
Bean vermicelli cake of 5 moisture content between 10%-14% is taken, to each bean vermicelli cake, uses the device of this example first
Moisture content detection is carried out with detection method, obtains result H1, then dehydration mensuration is used to carry out moisture content detection, obtains result
H2, (the H of five samples1,H2) measurement result is as follows：(10.69,10.70),(11.41,11.45),(11.48,11.52),
(12.53,12.67), (13.75,13.73), maximum deviation 0.14 meet the measurement accuracy requirement of food industry, the present invention
Device real-time online measuring moisture content can be carried out while ensureing measurement accuracy.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent replacement, improvement and so on are all included in the scope of protection of the present invention.
Claims (1)
1. a kind of method that deflection by measuring solid measures its moisture content,
The moisture content of solid is measured using a kind of device of on-line measurement solid aqueous rate,
Described device includes detection device holder, electrode mechanism, electrode drive mechanism, horizontal sliding table, solid detection switch and control
System processed；
The electrode mechanism includes the first electrode and second electrode of mutually insulated, the bottom surface of the first electrode and second electrode
Alignment, and is parallel to the plane that transmission mechanism places the solid, and the first electrode and second electrode are all connected to described
Control system；
The electrode drive mechanism includes electrode drive mechanism motor, electrode drive rotation change straight-line motion mechanism, electrode drive
Mechanism guide rail, the first sliding block, the second sliding block, the first sliding block connector, the second sliding block connector, limited post, electrode drive mechanism
Spring, electrode drive mechanism zero position switch, electrode drive mechanism base and pressure detection switch, the electrode drive mechanism motor
For the motor of pulse signal control, the electrode drive mechanism motor and electrode drive mechanism guide rail are fixedly mounted on described
On electrode drive mechanism base, the flat of the solid is placed in the direction of electrode drive mechanism guide rail perpendicular to transmission mechanism
Face, first sliding block and the second sliding block are all mounted on electrode drive mechanism guide rail, can be along the electrode drive mechanism
Guide rail moves along a straight line, and the second sliding block is located at the lower section of the first sliding block, and the electrode drive rotation becomes straight-line motion mechanism connection electricity
The rotary motion of electrode drive mechanism motor is changed into the first sliding block along electrode drive by pole driving mechanism motor and the first sliding block
The first sliding block connector and the second sliding block is fixedly mounted in the linear motion of mechanism guide rail respectively on the first sliding block and the second sliding block
Connector, along being parallel to electrode drive mechanism guide rail between the first sliding block connector and the second sliding block connector
Direction installation limited post and electrode drive mechanism spring, the limited post is for limiting the first sliding block connector and the second sliding block
Maximum distance between connector, in first sliding block or the first sliding block connector and the second sliding block or the second sliding block connector
Between pressure detection switch is installed, the pressure detection switch can be fixedly mounted on the first sliding block, the first sliding block connector, second
On sliding block and the second sliding block connector are one of arbitrary, installation site should ensure that when the first electrode and second electrode press to institute
When stating the power of solid and reaching setting value, the output state of the pressure detection switch changes, the output of the pressure detection switch
It is connected to the control system, electrode drive mechanism zero position switch is fixedly mounted on electrode drive mechanism base, is used for
The zero shift point of the straight-line displacement of first sliding block is detected, output connects the control system；
The electrode mechanism is fixedly installed in the downside of the second sliding block connector；
The horizontal sliding table includes horizontal sliding table motor, horizontal sliding table rotation change straight-line motion mechanism, horizontal sliding table guide rail, level
Slide unit sliding block, horizontal sliding table zero position switch and horizontal sliding table pedestal, the horizontal sliding table motor and horizontal sliding table guide rail are fixed
It is installed on horizontal sliding table pedestal, the side for being oriented parallel to the transmission mechanism and conveying the solid of the horizontal sliding table guide rail
To, the horizontal sliding table motor is the controllable motor of speed, and output shaft rotates change straight-line motion mechanism with horizontal sliding table and connect,
And change straight-line motion mechanism is rotated by horizontal sliding table, horizontal sliding table sliding block is driven to move along a straight line along horizontal sliding table guide rail, it is described
Horizontal sliding table zero position switch is fixedly installed on horizontal sliding table pedestal or detection device holder, is slided for detecting the horizontal sliding table
The zero shift point of the straight-line displacement of block, output connect the control system；
The electrode drive mechanism base is fixedly mounted on the horizontal sliding table sliding block；
The horizontal sliding table pedestal is fixedly mounted on the detection device holder, is located at the top of the transmission mechanism；
The detection device holder is mounted on measure field, and it is described that position should ensure that the first electrode and second electrode are located at
The top for the solid that transmission mechanism is transmitted, and when not measuring not with the solid contact；
The solid detection switch is fixedly mounted on the holder of the transmission mechanism or on detection device holder, is located at described the
The rear of one electrode and second electrode, i.e., the described solid first pass through solid detection switch, then just reach the first electrode and
The lower section of second electrode；The mounting height of the solid detection switch must guarantee to detect the solid, output connection
Control system；
The control system includes computer, display, resistance measuring circuit and two motor drivers；The resistance measurement electricity
Road includes that a divider resistance and a follower, the follower are realized by operational amplifier, and the divider resistance one terminates
Power supply, the input of another termination one electrode and follower, another described electrode ground connection, the output of follower are connected to institute
State computer；The solid detection switch, pressure detection switch, horizontal sliding table zero position switch, electrode drive mechanism zero position switch
It is connected to the computer；The control terminal of two motor drivers is connected to the computer, and the other end distinguishes receiving electrode driving
Mechanism motor and horizontal sliding table motor；
In the statement of described device, it is described it is front and back refer to the direction of the solid transmission be forward, after the negative direction of transmission is；
It is as follows using the measuring process of above-mentioned apparatus：
Step 1：The signal of solid detection switch described in control system cycle detection, when detecting the defeated of the solid detection switch
When going out second of saltus step, through delay, controls the horizontal sliding table and drive electrode drive mechanism mounted thereto and electrode mechanism
The direction for starting to move along the transmission mechanism moves, and so that the first electrode and second electrode is located at and is detected the solid
Surface, and moved synchronously opposing stationary along the direction that transmission mechanism moves with the solid；
It is characterized in that,
In step 1）Before starting measurement, advanced row calibration experiment, obtain from first electrode and second electrode contact the solid to
The output state of pressure detection switch changes the pulse that control system in the period controls the electrode drive mechanism motor rotation
The number of signalN P With the moisture content of solidHCorrespondence：H=f(N P ),
Rating test is fitted to obtainN P WithHBetween relationship：H=k*N P +b, in formulakWithbFor calibration coefficient；
Then, start step 1）Operation；
Step 2：The control system controls the electrode drive mechanism and the first electrode and second electrode is driven to move downward；
Step 3：Resistance between control system cycle detection first electrode and second electrode, when detecting that the resistance is significantly less than
When insulation resistance between first electrode and second electrode, starts counting up control system and control the electrode drive mechanism motor rotation
Pulse signal number, remember that the moment ist 1；
Step 4：The signal of pressure detection switch described in control system cycle detection, when the output shape for detecting pressure detection switch
When state changes, controls the electrode drive mechanism and stop that the first electrode and second electrode is driven to decline, stop tally control
System controls the number of the pulse signal of the electrode drive mechanism motor rotation, remembers that the moment ist 2；
Step 5：The note periodt: t 1 ≤ t < t 2In control system control electrode drive mechanism motor rotation
The number of pulse signal isN P , calculate the moisture content of the solidH=f(N P ), and measurement result is shown over the display；
Step 6：Control system controls the electrode drive mechanism and the first electrode and second electrode is driven to rise, until described
The output signal of electrode drive mechanism zero position switch generates saltus step, and control system controls electrode drive mechanism stop motion；
Step 7：Control system controls the movement that the horizontal sliding table stops the direction being moved along transmission mechanism, is changed to control water
Somoothing board is moved along the negative direction that transmission mechanism moves, until the output signal of the horizontal sliding table zero position switch generates jump
Become, control system controls the horizontal sliding table stop motion.
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| CN109323955A (en) * | 2018-11-30 | 2019-02-12 | 衢州学院 | A kind of Hu shaddock superiority and inferiority detector |
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Denomination of invention: A method of measuring the moisture content of a solid by measuring its deformation Effective date of registration: 20211214 Granted publication date: 20200602 Pledgee: Yantai financing guarantee Group Co.,Ltd. Pledgor: Yantai University Registration number: Y2021980014841 |
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