CN109932521A - A kind of laboratory automatically determines the device and measuring method of Ore granular porosity - Google Patents
A kind of laboratory automatically determines the device and measuring method of Ore granular porosity Download PDFInfo
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Abstract
The present invention relates to measurement Ore granular porosity technical fields, and the device and measuring method of Ore granular porosity are automatically determined more particularly to a kind of laboratory.Apparatus of the present invention include experimental box body, mechanism for monitoring and control system；The experimental box body includes shell, pedestal is provided in shell, liner is provided on pedestal, inner bladder cover is provided with above liner, inner bladder cover is arranged on shell by electric pushrod, it pushes bottom inner container lid that can enter interior gallbladder intracavity, formation confined space in electric pushrod, is provided with self-priming water pump, water injection pipe and the solenoid valve for controlling water injection pipe on inner bladder cover, is provided with drying unit outside the side wall of inner.The present invention has evaded the influence of Ore granular natural moisture content, and automation control porosity determination experimentation reduces influence of the human factor to experimentation, and determination data science is accurate, realizes Ore granular porosity determination experimental standard.
Description
Technical field
The present invention relates to measurement Ore granular porosity technical fields, automatically determine ore-rock more particularly to a kind of laboratory
The device and measuring method of granular media porosity.
Background technique
During metal mine underground mining, the porosity of Mine-rock in Caving Method granular media influences the size of Ore Flows in stope,
The final loss and dilution rate for influencing ore.The porosity of Ore granular refers to that the pore volume between loose rock or ore particle accounts for loose media
Long-pending percentage.Accurate Determining Ore granular porosity reduces mine loss and dilution, optimization is adopted for controlling Ore Flows form
Field structure parameter has important directive significance.
The main method of experimental determination Ore granular porosity is water flood at present, to be measured scattered to filling with glass cylinder
It is filled the water in the graduated cylinder of body, until filling, water injection rate is the pore volume of granular media to be measured, and equipment needed for testing is graduated cylinder, equipment
Simply, process is rough, and measurement result error is big, while the measuring method does not consider the moisture content of Ore granular, entirely tests
The Ore granular porosity of journey manual operation, record, measurement lacks scientific and accuracy, is unfavorable for carrying out to Ore granular hole
The scientific research of porosity.
Summary of the invention
(1) technical problems to be solved
In order to solve the above problem of the prior art, the present invention provides one kind and evades moisture content influence, automatic water filling, baking
The laboratory of dry, dynamic monitoring, data record and processing analysis and whole experiment process automation automatically determines Ore granular
The device and measuring method of porosity.
(2) technical solution
In order to achieve the above object, the main technical schemes that the present invention uses include:
The present invention provides the device that a kind of laboratory automatically determines Ore granular porosity, including experimental box body, monitoring machine
Structure and control system；The experimental box body includes shell, and pedestal is provided in shell, liner is provided on pedestal, inside
Inner bladder cover is provided with above gallbladder, inner bladder cover is arranged on shell by electric pushrod, inner bladder cover can in the case where electric pushrod is pushed into
Enter interior gallbladder intracavity, form confined space, inner bladder cover can be run up and down in liner cavity；Absorb Water is provided on inner bladder cover
Pump, for emptying water in liner, the suction hose of self-priming water pump is set in inner bladder cover, and water suction nozzle and inner bladder cover bottom surface maintain an equal level,
The nozzle that absorbs water is equipped with filter device (such as package crocus cloth), prevents granular media to be inhaled into, the drainpipe of self-priming water pump passes through shell
The outside of shell is arranged in outer wall；It is provided with water injection pipe on inner bladder cover and controls the solenoid valve of water injection pipe, for controlling liner
Water injection rate；It is provided with drying unit outside the side wall of inner, to carry out heating, drying to the granular media in liner.
The mechanism for monitoring is for monitoring the granular media held in liner and charging state variation；The mechanism for monitoring includes claiming
Sensor, temperature sensor, potentiometer, encoder, liquid-level switch, control instrument are retransmitted, weighing sensor and temperature sensor are set
It is placed on pedestal, for monitoring the weight and temperature change of the experimental material held in liner, potentiometer and encoder setting
In on electric pushrod, the potentiometer is used to feed back the size of electric pushrod electric motor resistance, to reflect where electric pushrod
Travel position, so that electric pushrod any position in stroke can stop, it is electronic to push away when inner bladder cover touches the granular media in liner
The motor resistance of bar increases, i.e. electric pushrod stop motion, encoder by the electric machine main shaft umber of pulse of record electric pushrod and
Turnning circle accurately calculates the stroke variation of electric pushrod；Liquid-level switch is arranged on the lower surface of inner bladder cover, control liner note
Water, the liquid-level switch, water injection pipe are used in combination with solenoid valve, and water filling pipe end is pierced by and connects from housing rear water filling pore
Water receiving source, when needing to fill the water, solenoid valve starting starts to intake, and when the water surface touches inner bladder cover, liquid-level switch controls solenoid valve
Power-off, water filling stop；
The control system includes programmable logic controller (PLC), interchanger, computer；Programmable logic controller (PLC) passes through friendship
It changes planes and is connected with computer, input terminal and the programmable logic control of the electric pushrod, self-priming water pump, solenoid valve and drying unit
The output end of device processed is connected, and the potentiometer, the output end of liquid-level switch are connected with the input terminal of programmable logic controller (PLC), claims
Sensor, temperature sensor and encoder is retransmitted to be connected by control instrument with programmable logic controller (PLC).
The programmable logic controller (PLC), power module, input/output module, interchanger, air switch, frequency converter setting
In control cabinet.
The electric pushrod stroke is consistent with liner depth.
The liner is an integral molding structure, and prevents leak, has good thermal conductivity.
Handle is set on the liner, is conveniently placed in experimental box body.
The drying unit selects heater strip or heating dish, and the arranged on left and right sides of liner is arranged in, corresponding with liner,
To accelerate drying efficiency.
It is provided with thermal insulation layer between the drying unit and shell, prevents shell heated, causes safety accident.
The present invention also provides the measuring methods that a kind of laboratory automatically determines Ore granular porosity, use described
Laboratory automatically determines the device of Ore granular porosity, specifically comprises the following steps:
Step 1: water injection pipe of the invention is connected to water source, is connected general supply and is started, detects each component operation conditions
It is whether normal, if there is component operation conditions abnormal, repairs, if working condition is all normal, then check that control instrument is shown
Whether numerical value is zero, if it is not, return-to-zero；
Step 2: input on computers scheduled load cell signal stablize time threshold t, liquid-level switch threshold value a,
Temperature threshold T, the liner floor space s and liner height H of temperature sensor；
Step 3: taking out liner, granular media to be measured be added in liner, and the upper surface of granular media is paved, liner is playbacked,
Computer opens drying unit by programmable logic controller (PLC), and programmable logic controller (PLC) monitors the number of weighing sensor simultaneously
Value closes drying unit, natural cooling if the numerical value maintains to stablize the time more than time threshold t described in step 2
Granular media, while the temperature value variation of programmable logic controller (PLC) monitoring temperature sensor；
Step 4: when the temperature value of programmable logic controller (PLC) monitoring temperature sensor reaches temperature described in step 2
When threshold value T, computer drives inner bladder cover to run down by PLC controls electric pushrod, when inner bladder cover touches
When granular media upper surface in liner, potentiometer enables electric pushrod out of service, and the stroke L of electric pushrod is conveyed to by encoder can
Programmed logic controller, and recorded by computer；
By formula h=H-L, wherein h is granular media height, and H is liner height, and L is the stroke of electric pushrod, obtains granular media
Height h, and it is shown in control instrument；
Step 5: computer is infused by water injection pipe into liner by programmable logic controller (PLC) opens solenoid valve, water source
Enter water, when the water surface in liner touches liquid-level switch, liquid-level switch delivers a signal to programmable logic controller (PLC), programmable to patrol
It collects controller and closes solenoid valve, after granular media water suction, water surface decline, when dropping distance reaches liquid-level switch threshold value a, liquid-level switch
Programmable logic controller (PLC), programmable logic controller (PLC) opens solenoid valve moisturizing are delivered a signal to, water surface site touches liquid level and opens
Guan Shi, programmable logic controller (PLC) is again switched off solenoid valve, and after granular media water suction, water surface decline is opened when dropping distance reaches liquid level
When closing threshold value a, liquid-level switch delivers a signal to programmable logic controller (PLC), programmable logic controller (PLC) opens solenoid valve moisturizing,
This process recycles for several times, until the water surface no longer declines, i.e. granular media water suction saturation, while when the signal of weighing sensor maintains to stablize
Between when being more than time threshold t described in step 2, computer records the gross weight magnitude G1 of granular media and water in liner, and is shown in
Control instrument；
Step 6: computer opens self-priming water pump by programmable logic controller (PLC), extracts granular media water suction saturation in liner out
Extra water afterwards may be programmed when the signal of weighing sensor maintains to stablize the time more than time threshold t described in step 2
Logic controller closes self-priming water pump, and computer records the weight G2 after granular media water suction saturation, and is shown in control instrument；
Step 7: passing through formulaIt obtains the porosity of surveyed granular media, and is shown in control instrument；
In formula: n is granular media porosity, and g is acceleration of gravity, ρWaterFor the density of water, granular media porosity n is obtained；
Step 8: saving experimental data, electric pushrod rises inner bladder cover, takes out liner, outwells granular media, cleans liner, puts
It returns in shell, prepare next group of experiment or closes experimental system.
It is 2min-10min that load cell signal, which stablizes time threshold t, in the step 2, and liquid-level switch threshold value a is
0mm-1mm, the temperature threshold T of temperature sensor are the room temperature of there and then.
(3) beneficial effect
The beneficial effects of the present invention are:
The present invention has evaded the influence of Ore granular natural moisture content, realizes the automation of whole experiment process, reduces
Influence of the human factor to experimentation, determination data science is accurate, realizes Ore granular porosity determination experimental standard.
Detailed description of the invention
Fig. 1 is the structural schematic diagram for the device that laboratory of the invention automatically determines Ore granular porosity；
Fig. 2 is the main view for the device that laboratory of the invention automatically determines Ore granular porosity；
Fig. 3 is the side view of Fig. 2；
Fig. 4 is that laboratory of the invention automatically determines the device of Ore granular porosity and the electrical principle frame of measuring method
Figure.
[description of symbols]
1: experimental box body；11: shell；12: pedestal；13: liner；131: handle；14: inner bladder cover；15: electric pushrod；16:
Self-priming water pump；17: water injection pipe；18: solenoid valve；19: drying unit；
2: mechanism for monitoring；21: weighing sensor；22: potentiometer；23: encoder；24: liquid-level switch；25: control instrument；
26: temperature sensor；
3: control system；31: programmable logic controller (PLC)；32: interchanger；33: computer；34: control cabinet.
Specific embodiment
In order to preferably explain the present invention, in order to understand, with reference to the accompanying drawing, by specific embodiment, to this hair
It is bright to be described in detail.
Referring to figs. 1 to Fig. 4, the present embodiment provides the devices that a kind of laboratory automatically determines Ore granular porosity, including
Experimental box body 1, mechanism for monitoring 2 and control system 3；The experimental box body 1 includes shell 11, and shell 11 lacks bottom surface with before for one
The interior empty cube of side, is provided with pedestal 12 in shell 11, and shell 11 is integrated with the interior empty cube that pedestal 12 is constituted
Design can also be separated and be designed；Liner 13 is provided on pedestal 12, liner 13 is the cubic container of a uncovered, for containing
Experiment granular media and water, liner 13 are an integral molding structure, and prevent leak, select the metal material with thermal conductive resin, such as
Aluminium, liner 13 can be placed on pedestal 12 from 11 leading flank of shell, and handle 131 is arranged on liner 13, is conveniently placed on
In shell 11.
It is provided with inner bladder cover 14 on liner 13, inner bladder cover 14 is a thin cube lid, in length and width dimensions and liner 13
Chamber length and width dimensions are consistent, and inner bladder cover 14 is connected by electric pushrod 15 with 11 top plate of shell, 15 stroke of electric pushrod and liner 13
Depth is consistent, and inner bladder cover 14 can enter 13 inner cavity of liner under the promotion of electric pushrod 15, form confined space, including inner bladder cover 14
It can be run up and down in 13 cavity of gallbladder；
Self-priming water pump 16 is provided on inner bladder cover 14, for water in liner 13 to be discharged, the suction hose of self-priming water pump 16 is set
Be placed in inner bladder cover 14, water suction nozzle and 14 bottom surface of inner bladder cover maintain an equal level, water suction nozzle be equipped with filter device (such as package spun yarn
Cloth), prevent granular media to be inhaled into, the drainpipe of self-priming water pump 16 passes through the outside that shell 11 is arranged in 11 outer wall of shell；In liner
It is provided with water injection pipe 17 on lid 14 and controls the solenoid valve 18 of water injection pipe 17, for controlling 13 water injection rate of liner；In the liner
Drying unit 19 is provided with outside 13 side walls, to carry out heating, drying to the granular media in liner 13；Drying unit 19 is using heating
Silk or heating dish, are arranged in the arranged on left and right sides of liner 13, corresponding with liner 13, to accelerate drying efficiency, in drying unit
It is provided with thermal insulation layer between 19 and 11 side wall of shell, prevents shell 11 heated, causes safety accident.
The mechanism for monitoring 2 includes weighing sensor 21, potentiometer 22, encoder 23, liquid-level switch 24, control instrument 25
With temperature sensor 26, weighing sensor 21 and temperature sensor 26 are set on pedestal 12, are contained for monitoring in liner 13
The weight and temperature change for the experimental material put, potentiometer 22 and encoder 23 are set on electric pushrod 15, the potentiometer
22 are used to feed back the size of 15 electric motor resistance of electric pushrod, to reflect the travel position where electric pushrod 15, so that electronic
Any position in stroke of push rod 15 can stop；
When inner bladder cover 14 touches the granular media in liner 13, the motor resistance of electric pushrod 15 increases, i.e. electric pushrod 15
Stop motion, encoder 23 accurately calculate electronic push away by the electric machine main shaft umber of pulse and turnning circle of record electric pushrod 15
The stroke of bar 15 changes；The lower surface of inner bladder cover 14 is arranged in liquid-level switch 24, controls 13 water injection rate of liner, the liquid-level switch
24, water injection pipe 17 is used in combination with solenoid valve 18, and 17 end of water injection pipe is pierced by from 11 rear wall of shell water filling pore and connects water
Source, when needing to fill the water, solenoid valve 18 starts, and starts to intake, and when liquid level touches inner bladder cover 14, liquid-level switch 24 controls electromagnetism
Valve 18 powers off, and water filling stops；
The control system 3 includes programmable logic controller (PLC) 31, interchanger 32, computer 33；Programmable logical controller
Device 31 is connected by interchanger 32 with computer 33, the electric pushrod 15, self-priming water pump 16, solenoid valve 18 and drying unit 19
Input terminal be connected with the output end of programmable logic controller (PLC) 31, the potentiometer 22, liquid-level switch 24 output end with can
The input terminal of programmed logic controller 31 is connected, and weighing sensor 21, temperature sensor 26 and encoder 23 pass through control instrument
25 are connected with programmable logic controller (PLC) 31, and control instrument 25 is used to show that the weight of surveyed granular media liner 13 Nei and temperature become
The movement travel of electric pushrod 15 in change and experimentation.Programmable logic controller (PLC) 31 passes through air switch and power module
Connection, programmable logic controller (PLC) 31 are connect by input/output module with mechanism for monitoring 2.
The power module, input/output module, air switch, programmable logic controller (PLC) 31 and interchanger 32 are set to
In control cabinet 34；Equally, the other types control system of built-in monitoring software and programming software can also be used.
The trailing flank of the shell 11 is provided with water filling pore, drain tube holes, cable aperture, for water injection pipe 17, draining
Pipe is passed through with cable.
It is provided with supporting plate on the weighing sensor 21, facilitates the placement of liner 13, when debugging weighing sensor 21,
The self weight of supporting plate and liner 13 is removed, guarantees that mechanism for monitoring 2 shows the net weight variation of experimental material.When being measured experiment, claim
The signal intensity for retransmitting sensor 21 is converted into numerical value and is shown on control instrument 25, meanwhile, programmable logic controller (PLC) 31 connects
The collection of letters number, and weight data is handled according to preset program, it is the weight change of accurate recording experimental material, analysis experiment
Process obtains accurate porosity value, the weight value separate records of every one step surveying.
The present embodiment additionally provides the measuring method that a kind of laboratory automatically determines the device of Ore granular porosity, uses
The laboratory automatically determines the device of Ore granular porosity, specifically comprises the following steps:
Step 1: water injection pipe 17 of the invention is connected to water source, is connected general supply and is started, and each component operation shape is detected
Whether condition is normal, if there is component operation conditions abnormal, repairs, if working condition is all normal, then checks control instrument 25
Show whether numerical value is zero, if it is not, return-to-zero；
Step 2: scheduled load cell signal is inputted on the computer 33 and stablizes that time threshold t is 2min, liquid level is opened
Pass threshold value a is 1mm, the temperature threshold T of temperature sensor is 20 DEG C of room temperature, liner floor space s is 0.04 ㎡, and liner height H is
0.3m；
Step 3: liner 13 is taken out, granular media to be measured is added in liner 13, and the upper surface of granular media is paved, by liner
13 playback, computer 33 open drying unit 19 by programmable logic controller (PLC) 31, and programmable logic controller (PLC) 31 is supervised simultaneously
The numerical value of weighing sensor 21 is surveyed, if it is more than time threshold t (2min) described in step 2 that the numerical value, which maintains the stable time,
Then close drying unit 19, natural cooling granular media, while the temperature value of 31 monitoring temperature sensor 26 of programmable logic controller (PLC)
Variation；
Step 4: when the temperature value of 31 monitoring temperature sensor 26 of programmable logic controller (PLC) reaches described in step 2
When temperature threshold T (20 DEG C), computer 33 by programmable logic controller (PLC) 31 control electric pushrod 15 drive inner bladder cover 14 to
Lower operation, when inner bladder cover 14 touches the granular media upper surface in liner 13, potentiometer 22 enables electric pushrod 15 out of service, coding
The stroke L of electric pushrod 15 is 0.1m by device 23, is conveyed to programmable logic controller (PLC) 31, and recorded by computer 33；
By formula h=H-L, wherein h is granular media height, and H is liner height, and L is the stroke of electric pushrod, obtains granular media
Height h=0.3m-0.1m=0.2m, and it is shown in control instrument 25；
Step 5: computer 33 by 31 opens solenoid valve 18 of programmable logic controller (PLC), water source by water injection pipe 17 to
Water is injected in liner 13, when the water surface in liner 13 touches liquid-level switch 24, liquid-level switch 24 delivers a signal to programmable patrol
Controller 31 is collected, programmable logic controller (PLC) 31 closes solenoid valve 18, after granular media water suction, water surface decline, when dropping distance reaches
When liquid-level switch threshold value a, liquid-level switch 24 delivers a signal to programmable logic controller (PLC) 31, and programmable logic controller (PLC) 31 is opened
18 moisturizing of solenoid valve, when the water surface touches liquid-level switch 24, programmable logic controller (PLC) 31 is again switched off solenoid valve 18, granular media water suction
Afterwards, the water surface declines, and when dropping distance reaches liquid-level switch threshold value a, liquid-level switch 24 delivers a signal to Programmable logical controller
Device 31,31 opens solenoid valve of programmable logic controller (PLC), 18 moisturizing, this process recycle six times, until the water surface no longer declines, that is, dissipate
Body water suction saturation, while the signal of weighing sensor 21 maintains to stablize the time more than time threshold t described in step 2
When (2min), it is 268.94N that computer 33, which records the gross weight magnitude G1 of granular media and water in liner 13, and is shown in control instrument
25；
Step 6: computer 33 opens self-priming water pump 16 by programmable logic controller (PLC) 31, extracts granular media in liner 13 out
Extra water after water suction saturation, when the signal of weighing sensor 21 maintains to stablize the time more than time threshold described in step 2
When t (2min), programmable logic controller (PLC) 31 closes self-priming water pump 16, and computer 33 records the weight G2 after granular media water suction saturation
For 235.53N, and it is shown in control instrument 25；
Step 7: passing through formula
In formula: n is granular media porosity, and g is acceleration of gravity, value 10N/kg, ρWaterFor the density of water, value 1kg/m3,
Obtain the porosity of surveyed granular media:
And it is shown in control instrument 25；
Step 8: saving experimental data, electric pushrod 15 rises inner bladder cover 14, takes out liner 13, outwells granular media, in cleaning
Gallbladder 13 is put back in shell 11, is prepared next group of experiment or is closed experimental system.
The above described is only a preferred embodiment of the present invention, be not the limitation that other forms are done to invention, it is any
Those skilled in the art are changed or are modified as the equivalent of equivalent variations possibly also with the technology contents of the disclosure above
Embodiment.But without departing from the technical solutions of the present invention, above embodiments are made according to the technical essence of the invention
Any simple modification, equivalent variations and remodeling, still fall within the protection scope of technical solution of the present invention.
Claims (7)
1. the device that a kind of laboratory automatically determines Ore granular porosity characterized by comprising experimental box body (1), monitoring
Mechanism (2) and control system (3)；The experimental box body (1) includes shell (11), is provided with pedestal (12) in shell (11),
It is provided with liner (13) on pedestal (12), is provided with inner bladder cover (14) above liner (13), inner bladder cover (14) passes through electronic
Push rod (15) is arranged on shell (11), and inner bladder cover (14) can enter liner (13) inner cavity, shape in the case where electric pushrod (15) push
At confined space, the electromagnetism of self-priming water pump (16), water injection pipe (17) and control water injection pipe (17) is provided on inner bladder cover (14)
Valve (18) is provided with drying unit (19) outside the liner (13) side wall；
The mechanism for monitoring (2) includes weighing sensor (21), temperature sensor (26), potentiometer (22), encoder (23), liquid
Bit switch (24), control instrument (25), weighing sensor (21) and temperature sensor (26) are set to pedestal (12), potentiometer
(22) it is arranged on electric pushrod (15) with encoder (23), liquid-level switch (24) is set to the lower surface of inner bladder cover (14)；
The control system (3) includes programmable logic controller (PLC) (31), interchanger (32), computer (33)；Programmable logic
Controller (31) is connected by interchanger (32) with computer (33)；
The electric pushrod (15), self-priming water pump (16), solenoid valve (18) and drying unit (19) input terminal patrolled with programmable
The output end of volume controller (31) is connected, the potentiometer (22), liquid-level switch (24) output end and Programmable logical controller
The input terminal of device (31) is connected, and weighing sensor (21), temperature sensor (26) and encoder (23) pass through control instrument (25)
It is connected with programmable logic controller (PLC) (31).
2. the device that laboratory as described in claim 1 automatically determines Ore granular porosity, which is characterized in that the drying
Device (19) selects heater strip or heating dish, and the arranged on left and right sides in liner (13) is arranged, corresponding with liner (13).
3. the device that laboratory as described in claim 1 automatically determines Ore granular porosity, which is characterized in that described electronic
Push rod (15) stroke is consistent with liner (13) depth.
4. the device that laboratory as described in claim 1 automatically determines Ore granular porosity, which is characterized in that the liner
(13) it is an integral molding structure.
5. the device that laboratory as described in claim 1 automatically determines Ore granular porosity, which is characterized in that in the baking
Thermal insulation layer is provided between equipment for drying (19) and shell (11) side wall.
6. a kind of laboratory automatically determines the measuring method of Ore granular porosity, use described in claim any one of 1-5
Laboratory automatically determine the device of Ore granular porosity, which comprises the steps of:
Step 1: water injection pipe (17) is connected to water source, is connected general supply and is started, whether just to detect each component operation conditions
Often, it if there is component operation conditions abnormal, repairs, if working condition is all normal, then checks that control instrument (25) show number
Whether value is zero, if it is not, return-to-zero；
Step 2: inputted on computer (33) scheduled load cell signal stablize time threshold t, liquid-level switch threshold value a,
Temperature threshold T, the liner floor space s and liner height H of temperature sensor；
Step 3: taking out liner (13), granular media to be measured is added in liner (13), and the upper surface of granular media is paved, by liner
(13) it playbacks, computer (33) opens drying unit (19) by programmable logic controller (PLC) (31), programmable logic controller (PLC)
(31) numerical value of weighing sensor (21) is monitored simultaneously, if the numerical value maintains to stablize the time more than the time described in step 2
Threshold value t is then closed drying unit (19), natural cooling granular media, while programmable logic controller (PLC) (31) monitoring temperature sensor
(26) temperature value variation；
Step 4: when the temperature value of programmable logic controller (PLC) (31) monitoring temperature sensor (26) reaches described in step 2
When temperature threshold T, computer (33) passes through programmable logic controller (PLC) (31) control electric pushrod (15) driving inner bladder cover (14)
It runs down, when inner bladder cover (14) touches the granular media upper surface in liner (13), potentiometer (22) enables electric pushrod (15) stop
It only runs, the stroke L of electric pushrod is conveyed to programmable logic controller (PLC) (31) by encoder (23), and is remembered by computer (33)
Record；
By formula h=H-L, wherein h is granular media height, and H is liner height, and L is the stroke of electric pushrod, obtains granular media height
H, and it is shown in control instrument (25)；
Step 5: for computer (33) by programmable logic controller (PLC) (31) opens solenoid valve (18), water source passes through water injection pipe
(17) water is injected into liner (13), when the water surface in liner (13) touches liquid-level switch (24), liquid-level switch (24) transmitting
Signal is given programmable logic controller (PLC) (31), and programmable logic controller (PLC) (31) closes solenoid valve (18), after granular media water suction, the water surface
Decline, when water surface dropping distance reaches liquid-level switch threshold value a, liquid-level switch (24) delivers a signal to programmable logic controller (PLC)
(31), programmable logic controller (PLC) (31) opens solenoid valve (18) moisturizing, when the water surface touches liquid-level switch (24), programmable logic
Controller (31) is again switched off solenoid valve (18), after granular media water suction, water surface decline, when dropping distance reaches liquid-level switch threshold value a
When, liquid-level switch (24) delivers a signal to programmable logic controller (PLC) (31), programmable logic controller (PLC) (31) opens solenoid valve
(18) moisturizing, this process recycle for several times, until the water surface no longer declines, i.e. granular media water suction is saturated, while weighing sensor (21)
Signal maintains to stablize the time when being more than time threshold t described in step 2, and computer (33) records granular media and water in liner
Gross weight magnitude G1, and it is shown in control instrument (25)；
Step 6: computer (33) opens self-priming water pump (16) by programmable logic controller (PLC) (31), in extraction liner (13)
Extra water after granular media water suction saturation, when the signal of weighing sensor (21) maintains to stablize the time to be more than described in step 2
Between threshold value t when, programmable logic controller (PLC) (31) close self-priming water pump (16), computer (33) record granular media water suction saturation after
Weight G2, and it is shown in control instrument (25)；
Step 7: passing through formulaIt obtains the porosity of surveyed granular media, and is shown in control instrument (25)；
In formula: n is granular media porosity, and g is acceleration of gravity, ρWaterFor the density of water, granular media porosity n is obtained；
Step 8: saving experimental data, electric pushrod (15) rises inner bladder cover (14), takes out liner (13), outwells granular media, cleans
Liner is put back in shell (11), is prepared next group of experiment or is closed experimental system.
7. the measuring method that laboratory as claimed in claim 6 automatically determines Ore granular porosity, which is characterized in that institute
Stating load cell signal in step 2 to stablize time threshold t is 2min-10min, and liquid-level switch threshold value a is 0mm-1mm, temperature
The temperature threshold T of sensor is the room temperature of there and then.
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| CN201910341252.3A CN109932521B (en) | 2019-04-25 | 2019-04-25 | Device and method for automatically measuring porosity of ore rock bulk in laboratory |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021000563A1 (en) * | 2019-07-01 | 2021-01-07 | 长沙矿冶研究院有限责任公司 | Parameter measuring device and method for polymetallic nodules |
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