CN109443844B - Ore pulp sampling and iron grade signal acquisition device and method - Google Patents
Ore pulp sampling and iron grade signal acquisition device and method Download PDFInfo
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- CN109443844B CN109443844B CN201811556613.8A CN201811556613A CN109443844B CN 109443844 B CN109443844 B CN 109443844B CN 201811556613 A CN201811556613 A CN 201811556613A CN 109443844 B CN109443844 B CN 109443844B
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- sampling
- sampling tube
- ore pulp
- measuring rod
- iron grade
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- 238000005070 sampling Methods 0.000 title claims abstract description 123
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 60
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000006835 compression Effects 0.000 claims abstract description 22
- 238000007906 compression Methods 0.000 claims abstract description 22
- 239000000428 dust Substances 0.000 claims description 23
- 239000011521 glass Substances 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 5
- 230000005284 excitation Effects 0.000 claims description 4
- 230000005674 electromagnetic induction Effects 0.000 claims description 2
- 239000010423 industrial mineral Substances 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
- 239000012634 fragment Substances 0.000 description 7
- 239000000523 sample Substances 0.000 description 7
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009614 chemical analysis method Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000003041 laboratory chemical Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000013208 measuring procedure Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/74—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables of fluids
Abstract
A device and a method for ore pulp sampling and iron grade signal acquisition relate to a sampling device and a method. The invention aims to solve the problems that the existing sampling device has only a single sampling function, and the sampling device needs to be transferred to a laboratory for measuring the ore pulp iron grade after sampling, so that the procedure is complicated. The device comprises a dustproof cap, a handle, a sampling tube, a measuring rod, a compression spring and a sampling tube lower end cover, wherein the lower end of the handle is connected with the upper end of the sampling tube; the ore pulp sampling and iron grade signal acquisition device further comprises a sensor measuring head and a set screw, wherein the sensor measuring head is sleeved on the outer side wall of the upper part of the sampling tube, and the lower part of the sensor measuring head is fixedly connected with the sampling tube through the set screw. The invention is used in the technical field of industrial mineral separation.
Description
Technical Field
The invention relates to a sampling device and a sampling method, in particular to a device and a method for sampling ore pulp and collecting iron grade signals.
Background
In the industrial ore dressing process, in order to judge the quality of iron ore pulp in different batches and working procedures, ore pulp with different depths in an ore pulp tank in the ore dressing process is required to be sampled and analyzed, the analysis and test results can provide data references for optimizing the technological process and fine adjustment production equipment parameters, the traditional ore pulp sampler has only a single sampling function, after sampling, the traditional ore pulp sampler is required to be transferred to a laboratory for measuring the iron ore pulp grade, and the laboratory chemical analysis method is accurate in measurement, but the working procedure is complicated, and the test period is long.
Disclosure of Invention
The invention aims to solve the problem that the prior sampling device has only a single sampling function, and the prior sampling device needs to be transferred to a laboratory for measuring the iron grade of ore pulp after sampling, so that the process is complicated, and further provides an ore pulp sampling and iron grade signal acquisition device.
The technical scheme adopted by the invention for solving the problems is as follows:
the invention comprises a dustproof cap, a handle, a sampling tube, a measuring rod, a compression spring and a sampling tube lower end cover, wherein the lower end of the handle is connected with the upper end of the sampling tube, the measuring rod sequentially penetrates through the handle and the sampling tube from top to bottom, the lower end of the measuring rod is inserted into the upper surface of the sampling tube lower end cover, and the dustproof cap is sleeved at the upper end of the measuring rod; the ore pulp sampling and iron grade signal acquisition device further comprises a sensor measuring head and a set screw, wherein the sensor measuring head is sleeved on the outer side wall of the upper part of the sampling tube, and the lower part of the sensor measuring head is fixedly connected with the sampling tube through the set screw.
Further, the sensor gauge head includes fossil fragments, glass observation window, sensor coil, two lead wire holes and shielding skin, and open the outer wall of fossil fragments has annular breach, and two lead wire hole symmetries set up on the lateral wall of fossil fragments upper end, and sensor coil twines in the annular breach of fossil fragments, and two ends of sensor coil derive from two lead wire holes respectively, and the glass observation window sets up between two lead wire holes, and the shielding skin covers the annular breach department at fossil fragments.
Further, the device also comprises a pressure spring supporting plate and a sealing gasket, wherein the pressure spring supporting plate and the sealing gasket are sequentially sleeved on the measuring rod from top to bottom, the pressure spring supporting plate is positioned at the joint of the sampling tube and the handle, and the sealing gasket is positioned in the groove on the upper surface of the sampling tube.
Further, the upper end of the compression spring is located on the lower surface of the shoulder, and the lower end of the compression spring is located on the upper surface of the compression spring supporting plate.
Further, the device also comprises a rubber gasket which is sleeved on the measuring rod and is positioned on the upper surface of the shoulder.
Further, the upper surface of sampling tube lower extreme cover is equipped with the annular groove, and the circular packing ring sets up in the annular groove.
Further, a screw propeller is arranged at the bottom of the lower end cover of the sampling tube.
Further, the propeller consists of six rotating blades.
Further, the lower end of the handle is in threaded connection with the upper end of the sampling tube, the dustproof cap is sleeved at the upper end of the measuring rod, and the dustproof cap is in threaded connection with the upper end of the measuring rod.
A method for sampling ore pulp and collecting iron grade signals comprises the following specific steps:
Step one: placing the collecting device in an ore pulp tank, rotating the dust cap clockwise, and then rotating the screw 10-2 at the bottom of the lower end cover 10 of the sampling tube to stir the ore pulp near the to-be-sampled position;
Step two: the sampling personnel holds the handle 2 and presses the dust cap 1 downwards, the dust cap 1 drives the measuring rod 11 to move downwards to the limit position, the compression spring 13 is in a compressed state, the lower end cover 10 of the sampling tube at the bottom of the measuring rod 11 moves downwards and is separated from the sampling tube 9, the lower port of the sampling tube 9 is opened, and ore pulp in the ore pulp tank can flow into the sampling tube from the bottom of the sampling tube 9;
step three: according to the observation of the glass observation window 5 on the sensor probe 7, the sampling staff is to observe that the ore pulp in the sampling tube 9 is full of the sensor coil 15, the dust cap 1 is loosened, the compression spring 13 is released to the initial state, the measuring rod 11 moves upwards, the lower end cover 10 of the sampling tube moves upwards along with the measuring rod 11, the lower port of the sampling tube 9 is tightly contacted with the circular gasket 17 in the lower end cover 10 of the sampling tube, and then the lower port of the sampling tube 9 is closed and sealed, so that the sampling work is completed.
The beneficial effects of the invention are as follows:
The sensor measuring head part is added, the sensor measuring head can move up and down along the length direction of the sampling tube and is fixed by the set screw, the sampling of ore pulp with different depths can be effectively satisfied, the iron grade of the ore pulp can be measured by an electromagnetic method after the sampling, complicated measuring procedures are avoided, and the working efficiency is improved; the invention has simple structure and easy operation.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a left side view of the present invention;
Fig. 3 is a sectional view A-A of fig. 2.
Detailed Description
The first embodiment is as follows: referring to fig. 1 to 3, a pulp sampling and iron grade signal collecting device according to this embodiment includes a dust cap 1, a handle 2, a sampling tube 9, a measuring rod 11, a compression spring 13 and a sampling tube lower end cover 10, wherein the lower end of the handle 2 is connected with the upper end of the sampling tube 9, the measuring rod 11 sequentially penetrates through the handle 2 and the sampling tube 9 from top to bottom, the lower end of the measuring rod 11 is inserted into the upper surface of the sampling tube lower end cover 10, and the dust cap 1 is sleeved at the upper end of the measuring rod 11; the ore pulp sampling and iron grade signal acquisition device further comprises a sensor measuring head 7 and a set screw 8, wherein the sensor measuring head 7 is sleeved on the outer side wall of the upper portion of the sampling tube 9, and the lower portion of the sensor measuring head 7 is fixedly connected with the sampling tube 9 through the set screw 8.
The sensor gauge head 7 can be along the length direction of sampling tube 9, reciprocates its position, fixes with holding screw 8, can effectively satisfy the ore pulp to different degree of depth and take a sample, can measure ore pulp iron grade through the electromagnetic method after the sample, has avoided loaded down with trivial details measurement procedure, has improved the efficiency of work.
The second embodiment is as follows: referring to fig. 1 to 3, in this embodiment, the sensor probe 7 includes a keel 16, a glass observation window 4, a sensor coil 15, two lead holes 5 and a shielding outer layer 6, the outer wall of the keel 16 is provided with an annular gap, the two lead holes 5 are symmetrically arranged on the outer side wall of the upper end of the keel 16, the sensor coil 15 is wound in the annular gap of the keel 16, two ends of the sensor coil 15 are led out from the two lead holes 5 respectively, the glass observation window 4 is arranged between the two lead holes 5, and the shielding outer layer 6 is covered at the annular gap of the keel 16.
The fossil fragments 16 adopt non-metal insulating material, form sensor coil 15 in the annular breach of enameled wire winding fossil fragments 16, and two ends of sensor coil 15 derive from two lead holes 5 respectively, can further connect external measuring device, and glass observation window 4 is transparent glass for monitoring sample ore pulp liquid level whether up to standard, can look over simultaneously and monitor the upward amount of gushing of ore pulp and should not flow in compression spring 13 place space.
Other components and connection relationships are the same as those of the first embodiment.
And a third specific embodiment: referring to fig. 1 to 3, the device according to the present embodiment further includes a pressure spring support plate 3 and a sealing washer 14, the pressure spring support plate 3 and the sealing washer 14 are sequentially sleeved on the measuring rod 11 from top to bottom, the pressure spring support plate 3 is located at the connection position between the sampling tube 9 and the handle 2, and the sealing washer 14 is located in the upper surface of the sampling tube 9.
This is arranged to prevent pulp from penetrating into the space where the compression spring 13 is located along the outer wall of the spindle 11.
Other components and connection relationships are the same as those of the first embodiment.
The specific embodiment IV is as follows: the present embodiment will be described with reference to fig. 1 to 3, in which the upper end of the compression spring 13 is located on the lower surface of the shoulder 11-1, and the lower end of the compression spring 13 is located on the upper surface of the compression spring support plate 3.
Other compositions and connection relationships are the same as those of the third embodiment.
Fifth embodiment: the present embodiment will be described with reference to fig. 1 to 3, and the device further includes a rubber washer 12, where the rubber washer 12 is sleeved on the spindle 11 and is located on the upper surface of the shoulder 11-1.
So configured, when the dust cap 1 is released and the compression spring 13 is restored to its original state, the rubber washer 12 plays a role of cushioning.
Other components and connection relationships are the same as those of the first embodiment.
Specific embodiment six: referring to fig. 1 to 3, in the present embodiment, an annular groove 10-1 is formed on the upper surface of the lower end cap 10 of the sampling tube, and a circular washer 17 is disposed in the annular groove 10-1.
The circular gasket is made of rubber, so that the circular gasket is arranged, and can effectively seal the bottom of the sampling tube after the sampling process is finished, so that ore pulp in the tube is prevented from overflowing.
Other components and connection relationships are the same as those of the first embodiment.
Seventh embodiment: referring to fig. 1 to 3, a description will be given of the present embodiment, in which a screw 10-2 is provided at the bottom of a lower end cap 10 of a sampling tube.
So set up, when pressing down dust cap 1, but clockwise rotation dust cap 1, dust cap 1 drive measuring staff 11 rotation, measuring staff 11 drive sampling tube bottom end cover 10 bottom screw 10-2 rotatory stirring near ore pulp, can effectively solve the poor problem of ore pulp sample representativeness because of the ore pulp layering leads to.
Other compositions and connection relationships are the same as those of the sixth embodiment.
Eighth embodiment: the present embodiment is described with reference to fig. 1 to 3, wherein the propeller 10-2 is composed of six rotating blades. So set up, be convenient for better stir the ore pulp.
Other compositions and connection relationships are the same as those of the seventh embodiment.
Detailed description nine: referring to fig. 1 to 3, in the present embodiment, the lower end of the handle 2 is in threaded connection with the upper end of the sampling tube 9, the dust cap 1 is sleeved on the upper end of the measuring rod 11, and the dust cap 1 is in threaded connection with the upper end of the measuring rod 11.
Detailed description ten: the present embodiment will be described with reference to fig. 1 to 3, in which the method according to the present embodiment includes the following specific steps:
Step one: the device is placed in the ore pulp tank, the dust cap 1 is rotated clockwise, at the moment, the screw propeller 10-2 for stirring at the bottom of the lower end cover 10 of the sampling tube is rotated along with the dust cap, and ore pulp near the to-be-sampled is stirred, so that the problem of poor representativeness of ore pulp samples caused by ore pulp layering can be effectively solved;
Step two: the sampling personnel holds the handle 2 and slowly presses down the dust cap 1, the dust cap 1 drives the measuring rod 11 to move downwards to the limit position, the compression spring 13 is in a compressed state, the lower end cover 10 of the sampling tube at the bottom of the measuring rod 11 moves downwards and is separated from the sampling tube 9, the lower port of the sampling tube 9 is opened, and the ore pulp in the ore pulp tank can flow into the sampling tube from the bottom of the sampling tube;
step three: when the level position of the ore pulp inside and outside the sampling tube 9 in the ore pulp tank is consistent, the ore pulp is full of the sensor coil, the dustproof cap 1 is slowly loosened, the compression spring 13 is released to the initial state, the measuring rod 11 moves upwards, the lower end cover 10 of the sampling tube moves upwards along with the measuring rod 11, the lower port of the sampling tube 9 is tightly contacted with the circular gasket 17 in the lower end cover 10 of the sampling tube, and then the lower port of the sampling tube 9 is closed and sealed, so that the sampling work is completed. In this way, the slurry is prevented from flowing out of the bottom of the cartridge 9.
Step four: after the sampling is completed, the sampling cylinder 9 is filled with iron ore pulp, the ore pulp is a coil iron core, and once external alternating current excitation signals or excitation signals are applied to two ends of a lead of the sensor coil 15, voltage signals corresponding to the iron grade of the ore pulp can be derived from the lead based on electromagnetic induction, so that automatic acquisition of the iron grade signals is completed.
The collecting device is placed deep into the pulp tank, so that the collecting device exceeds the upper part of the shielding outer layer 6 and does not exceed the glass observation window 4.
The sampling device can also sample different ore pulp except the iron-removing ore pulp.
The present invention is not limited to the preferred embodiments, but is capable of modification and variation in detail, and other embodiments, such as those described above, of making various modifications and equivalents will fall within the spirit and scope of the present invention.
Claims (4)
1. The method is characterized in that an ore pulp sampling and iron grade signal collecting device is used for collecting the ore pulp sampling and iron grade signal, the ore pulp sampling and iron grade signal collecting device comprises a dust cap (1), a handle (2), a pressure spring supporting plate (3), a sealing gasket (14), a sensor measuring head (7), a set screw (8), a sampling tube (9), a measuring rod (11), a compression spring (13) and a sampling tube lower end cover (10), the lower end of the handle (2) is connected with the upper end of the sampling tube (9), the measuring rod (11) sequentially penetrates through the handle (2) and the sampling tube (9) from top to bottom, the lower end of the measuring rod (11) is inserted into the upper surface of the sampling tube lower end cover (10), and the dust cap (1) is sleeved at the upper end of the measuring rod (11); the sensor measuring head (7) is sleeved on the outer side wall of the upper part of the sampling tube (9), and the lower part of the sensor measuring head (7) is fixedly connected with the sampling tube (9) through a set screw (8);
the sensor measuring head (7) comprises a keel (16), a glass observation window (4), a sensor coil (15), two lead holes (5) and a shielding outer layer (6), wherein an annular gap is formed in the outer wall of the keel (16), the two lead holes (5) are symmetrically arranged on the outer side wall of the upper end of the keel (16), the sensor coil (15) is wound in the annular gap of the keel (16), two ends of the sensor coil (15) are led out from the two lead holes (5) respectively, the glass observation window (4) is arranged between the two lead holes (5), and the shielding outer layer (6) covers the annular gap of the keel (16);
The pressure spring support plate (3) and the sealing washer (14) are sequentially sleeved on the measuring rod (11) from top to bottom, the pressure spring support plate (3) is positioned at the joint of the sampling tube (9) and the handle (2), and the sealing washer (14) is positioned in a groove on the upper surface of the sampling tube (9);
The upper end of the compression spring (13) is positioned on the lower surface of the shoulder (11-1), and the lower end of the compression spring (13) is positioned on the upper surface of the compression spring supporting plate (3);
The upper surface of the lower end cover (10) of the sampling tube is provided with an annular groove (10-1), and a circular gasket (17) is arranged in the annular groove (10-1);
a propeller (10-2) is arranged at the bottom of the lower end cover (10) of the sampling tube;
The method is characterized by comprising the following specific steps of:
step one: placing the collecting device in an ore pulp tank, rotating the dust cap (1) clockwise, and then rotating a propeller (10-2) at the bottom of a lower end cover (10) of the sampling tube to stir ore pulp near to be sampled;
step two: the sampling personnel hold the handle (2), press the dust cap (1) downwards, the dust cap (1) drives the measuring rod (11) to move downwards to the limit position, the compression spring (13) is in a compressed state, the position of the lower end cover (10) of the sampling tube at the bottom of the measuring rod (11) moves downwards and is separated from the sampling tube (9), the lower port of the sampling tube (9) is opened, and ore pulp in the ore pulp tank can flow into the sampling tube (9) from the bottom of the sampling tube;
Step three: according to observation in a glass observation window (4) on a sensor measuring head (7), ore pulp in a sampling tube (9) is filled with a sensor coil (15), a dustproof cap (1) is loosened, a compression spring (13) is released to an initial state, a measuring rod (11) moves upwards, a lower end cover (10) of the sampling tube moves upwards along with the measuring rod (11), a lower port of the sampling tube (9) is tightly contacted with a circular gasket (17) in the lower end cover (10) of the sampling tube, and then the lower port of the sampling tube (9) is closed and sealed to finish sampling work;
Step four: after the sampling is finished, the sampling cylinder (9) is filled with iron ore pulp, the ore pulp is a coil iron core, and once external alternating current excitation signals or excitation signals are applied to two ends of a lead of a sensor coil (15), voltage signals corresponding to the iron grade of the ore pulp can be derived from the lead based on electromagnetic induction, so that automatic acquisition of the iron grade signals is finished.
2. The ore pulp sampling and iron grade signal collecting method according to claim 1, wherein the ore pulp sampling and iron grade signal collecting device further comprises a rubber gasket (12), wherein the rubber gasket (12) is sleeved on the measuring rod (11) and is located on the upper surface of the shoulder (11-1).
3. The method for ore pulp sampling and iron grade signal acquisition according to claim 1, wherein the propeller (10-2) is composed of six rotating blades.
4. The ore pulp sampling and iron grade signal collecting method according to claim 1, wherein the lower end of the handle (2) is in threaded connection with the upper end of the sampling tube (9), the dust cap (1) is sleeved at the upper end of the measuring rod (11), and the dust cap (1) is in threaded connection with the upper end of the measuring rod (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811556613.8A CN109443844B (en) | 2018-12-19 | 2018-12-19 | Ore pulp sampling and iron grade signal acquisition device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811556613.8A CN109443844B (en) | 2018-12-19 | 2018-12-19 | Ore pulp sampling and iron grade signal acquisition device and method |
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| Publication Number | Publication Date |
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| CN109443844A CN109443844A (en) | 2019-03-08 |
| CN109443844B true CN109443844B (en) | 2024-04-19 |
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| CN201811556613.8A Active CN109443844B (en) | 2018-12-19 | 2018-12-19 | Ore pulp sampling and iron grade signal acquisition device and method |
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| CN111337315A (en) * | 2020-04-11 | 2020-06-26 | 哈尔滨理工大学 | Online sampling device of ore pulp pipeline |
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| US4053354A (en) * | 1975-04-10 | 1977-10-11 | Ab Kalle-Regulator, Industrivagen | Method and device for forming a filtering fiber cake in an apparatus for measuring the beating degree of pulp flowing through a conduit |
| US5258712A (en) * | 1991-01-19 | 1993-11-02 | Bruker Analytische Messtechnik Gmbh | Sample head for flowthrough NMR spectroscopy |
| CN102230872A (en) * | 2010-06-01 | 2011-11-02 | 鞍钢集团矿业公司 | Device and method for on-line testing of grade of magnetic iron in flowing ore pulp |
| CN204556305U (en) * | 2015-01-26 | 2015-08-12 | 云南磷化集团有限公司 | A kind of columned pneumatic flotation machine depth sampler |
| CN105890925A (en) * | 2015-08-26 | 2016-08-24 | 云南华联锌铟股份有限公司 | Deep-trough ore pulp sampler |
| CN205593791U (en) * | 2016-03-10 | 2016-09-21 | 昆明理工大学 | Ore dressing laboratory wet -type sample ore sampling device |
| CN209231021U (en) * | 2018-12-19 | 2019-08-09 | 哈尔滨理工大学 | A kind of sampling pulp and Iron grade signal pickup assembly |
-
2018
- 2018-12-19 CN CN201811556613.8A patent/CN109443844B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4053354A (en) * | 1975-04-10 | 1977-10-11 | Ab Kalle-Regulator, Industrivagen | Method and device for forming a filtering fiber cake in an apparatus for measuring the beating degree of pulp flowing through a conduit |
| US5258712A (en) * | 1991-01-19 | 1993-11-02 | Bruker Analytische Messtechnik Gmbh | Sample head for flowthrough NMR spectroscopy |
| CN102230872A (en) * | 2010-06-01 | 2011-11-02 | 鞍钢集团矿业公司 | Device and method for on-line testing of grade of magnetic iron in flowing ore pulp |
| CN204556305U (en) * | 2015-01-26 | 2015-08-12 | 云南磷化集团有限公司 | A kind of columned pneumatic flotation machine depth sampler |
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| CN109443844A (en) | 2019-03-08 |
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