CN107225083B - Sand grading detection method and device using same - Google Patents
Sand grading detection method and device using same Download PDFInfo
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- CN107225083B CN107225083B CN201710574521.1A CN201710574521A CN107225083B CN 107225083 B CN107225083 B CN 107225083B CN 201710574521 A CN201710574521 A CN 201710574521A CN 107225083 B CN107225083 B CN 107225083B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/42—Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for screens
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
- B07B1/4609—Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B2201/00—Details applicable to machines for screening using sieves or gratings
- B07B2201/04—Multiple deck screening devices comprising one or more superimposed screens
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses a method for detecting sand grading and a device using the method, wherein a motor drives a plurality of layers of screens which are vertically arranged at intervals to vibrate, the diameters of the screen holes of the screens are sequentially reduced from top to bottom, and a sample is placed on the screen at the uppermost layer to start vibrating screening; after the sample is subjected to vibration screening, the sample is scattered on each layer of screen, and the motor stops vibrating; respectively weighing the sample on each layer of screen, and recording to obtain P 1 、P 2 、…、P n Adding the weight of the samples of each layer to obtain P Total (S) ，P Total (S) ＝P 1 +P 2 +…+P n The method comprises the steps of carrying out a first treatment on the surface of the From the obtained data P 1 、P 2 、…、P n P Total (S) Calculating the passing rate T of each layer of screen cloth 1 、T 2 、…、T n Finally according to the obtained passing rate T 1 、T 2 、…、T n And (5) drawing a sand grading curve. The invention has high working efficiency, and can be independently operated by a single person.
Description
Technical Field
The invention relates to a sand grading detection method and a device using the method, and belongs to the technical field of automatic screening and weighing.
Background
Poor quality sand grading refers to the imbalance or lack of sand particle collocation proportions of different particle sizes. Good grading means that the coarse-grained voids are exactly filled with the medium-grained voids are exactly filled with the fine-grained voids, thereby forming the most dense packing state. The grading curve of the sand and stone particles can be intuitively analyzed. The screen grading curve is plotted with the pass rate on the ordinate and the screen mesh size on the abscissa. The broken grain interval can be quickly found out by drawing a sieving grading curve, so that the grain interval can be purposefully supplemented, and if excessive conditions exist, the grain interval can be adjusted in advance.
At present, the labor intensity of the laboratory staff in the construction site for drawing the screening distribution curve is high. If the belt conveyor is calculated according to the width of 1200mm and the conveying capacity of 300t/h, the production time of each truck is 50t, the production time is 10h each day, and each truck needs to be subjected to spot inspection, the spot inspection is carried out at least 60 times each day. After each sampling is calculated according to 2 minutes of shutdown, the sample is retrieved, the sample is screened by a screening method for 10 minutes, data are recorded for 5 minutes, the passing rate is calculated for 2 minutes, a grading curve is drawn for 1 minute, the total of 20 minutes is taken for each sampling, screening and weighing and report generation, and the total time is 20 hours per day. The manual sampling, screening and weighing tabulation process also has absolute errors caused by manual errors such as neglected marks, misreading, miscalculating and the like, and when the weight of a sample exceeds 50 jin, at least two experimenters are required to finish the process in a cooperative manner.
Disclosure of Invention
The invention provides a method for detecting sand grading and a device using the method, which overcome the defects in the background technology. The technical scheme adopted for solving the technical problems is as follows:
a method for detecting sand grading, comprising:
the method comprises the steps that firstly, a motor drives a plurality of layers of screens which are vertically arranged at intervals to vibrate, the diameters of the screen holes of the screens are sequentially reduced from top to bottom, and a sample is placed on the screen holes of the uppermost layer to start vibrating screening;
step two, after the sample is subjected to vibration screening, the sample is scattered on each layer of screen, and the motor stops vibrating;
respectively weighing the sample weight on each layer of screen, and recording to obtain P 1 、P 2 、…、P n Adding the weight of the samples of each layer to obtain P Total (S) ，P Total (S) ＝P 1 +P 2 +…+P n ；
Step four, according to the obtained data P 1 、P 2 、…、P n P Total (S) Calculating the passing rate T of each layer of screen cloth 1 、T 2 、…、T n Finally according to the obtained passing rate T 1 、T 2 、…、T n And (5) drawing a sand grading curve.
In a preferred embodiment: the screening time by motor vibration is 5-15 minutes; the total weight of the sample is 30-50kg.
In a preferred embodiment: the screens are opened step by step from bottom to top to weigh, after each screen is opened, the sample on the opened screen directly falls into a weighing device to weigh, the weighing device is connected with a PLC controller, the measured data are automatically stored in the PLC controller, and finally the PLC controller automatically calculates T 1 、T 2 、…、T n And generating a sand grading curve.
The sand grading detection device comprises a screening device, a discharging device and a weighing device;
the screening device comprises a base, a screen body, an elastic component connected between the base and the screen body and a motor for driving the screen body to vibrate, wherein a plurality of layers of screens are arranged on the screen body, the screens are vertically arranged at intervals, and the diameters of the screens are sequentially reduced from top to bottom;
the discharging device is provided with a driving cylinder corresponding to each layer of screen body, the driving cylinder drives the screen to discharge, at least two modes of driving the screen to discharge are provided, one mode is that the driving cylinder drives the screen to overturn for discharging, the other mode is that the driving cylinder drives the screen to horizontally move out of the screen body, the discharging device also comprises a scraping part arranged on the screen body, and when the screen horizontally moves out of the screen body, the scraping part scrapes a sample of the screen;
the weighing device is arranged below the screening device and comprises a weighing bracket, a weighing sensor and a weighing bin, wherein the weighing sensor and the weighing bin are arranged on the weighing bracket, the weighing bin is supported by the weighing sensor and is positioned under the screen, a discharge opening is formed in the bottom of the weighing bin, and the weighing device further comprises a door plate mechanism for switching the discharge opening.
In a preferred embodiment: the door plate mechanism comprises a door plate, an air cylinder and two connecting pieces, wherein the two connecting pieces are symmetrically arranged on the left side and the right side of the door plate, one end of each connecting piece is connected with the door plate, the other end of each connecting piece is rotationally connected with the weighing bin, the air cylinder is arranged on the weighing bin, and a telescopic rod of each air cylinder is connected with the door plate; the door plate mechanism further comprises two oil cups which are respectively arranged on the weighing bin, and the oil cups can lubricate the connecting points of the connecting piece and the weighing bin.
In a preferred embodiment: the number of the weighing sensors is multiple and the weighing sensors are uniformly distributed on the periphery of the weighing bin, and a shock pad is arranged between the weighing sensors and the weighing bin; the weighing sensor is connected with a grounding wire.
In a preferred embodiment: the weighing bracket is provided with a fixed block corresponding to the weighing sensor, the weighing sensor is arranged on the fixed block, an anti-swing bolt is further arranged between the fixed block and the weighing bin, the anti-swing bolt is vertically arranged, one end of the anti-swing screw is fixedly connected with the weighing bin, and the other end of the anti-swing screw movably penetrates through the fixed block.
In a preferred embodiment: the elastic component comprises a spring and a spring seat, the spring seat is connected to the base, and the spring is arranged on the spring seat and provides supporting elastic force for the screen body; the motor is mounted on the screen.
In a preferred embodiment: the base of the screening device and the weighing bracket of the weighing device are fixed together through bolts.
In a preferred embodiment: these screens were 7 layers in total, and the screen mesh diameters of the screens were respectively from top to bottom: 4.75mm,2.36mm,1.18mm,0.6mm,0.3mm,0.15mm,0.075mm, or the mesh diameters of the screens are respectively from top to bottom: 37.5mm,31.5mm,26.5mm,19mm,13.2mm,9.5mm,4.75mm.
Compared with the background technology, the technical proposal has the following advantages:
1. the screening device is utilized to automatically screen the sample, and the weighing device can automatically weigh the weight of the sample on each layer of screen, so that the passing rate of each layer of screen can be conveniently calculated, and finally, the sand grading curve is drawn. The standard grading curve in the construction technical specifications of cement concrete and asphalt concrete is compared and analyzed, the sand grading can be optimized, the economic and reasonable stirring parameters are determined, and important basic data are provided for the stability study of the quality of the concrete for paving and the concrete for pouring.
2. The total of 15 minutes is generated by single sampling, screening and weighing and report forming, and compared with the manual sampling, screening and weighing and report forming process which is 20 minutes, the method saves 5 minutes and 5 hours each day. In addition, the single sampling, screening, weighing and report generating processes are not easy to generate errors. In addition, the maximum sample volume can be more than 40kg, and the single person can also independently operate the sample.
Drawings
The invention is further described below with reference to the drawings and examples.
FIG. 1 is a schematic front view of a sand grading detection device according to the present invention.
FIG. 2 is a schematic side view of the sand grading detection device of the present invention.
Detailed Description
Referring to fig. 1 and 2, the sand grading detection device of the present invention is characterized in that: comprising a screening device 10, a discharge device 20 and a weighing device 30. The screening device 10 screens a sample according to its diameter. The discharge device 20 is used to discharge the sample from the screen. The weighing device 30 is used for weighing the sample obtained by sieving.
The screening device 10 comprises a base 11, a screen 12, an elastic assembly 13 connected between the base and the screen, and a motor 14 for driving the screen to vibrate. The screen body 12 is provided with a plurality of layers of screens 15, the screens 15 are vertically arranged at intervals, and the diameters of the holes of the screens 15 are sequentially reduced from top to bottom. The elastic assembly 13 includes a spring 132 and a spring seat 134, the spring seat 134 is connected to the base 11, and the spring 132 is disposed on the spring seat 134 and provides a supporting elastic force to the screen 12. The two motors 14 are symmetrically arranged at the front side and the rear side of the screen body 12.
These screens 15 are 7 layers in total, and the screen diameters of the screens 15 are respectively from top to bottom: 4.75mm,2.36mm,1.18mm,0.6mm,0.3mm,0.15mm,0.075mm, or the mesh diameters of the mesh 15 are, respectively, from top to bottom: 37.5mm,31.5mm,26.5mm,19mm,13.2mm,9.5mm,4.75mm.
The discharging device 20 is provided with a driving cylinder 22 corresponding to each layer of the screen 12, and the driving cylinder 22 drives the screen 15 to discharge, specifically, the driving cylinder 22 can drive the screen 15 to overturn for discharging. Of course, the driving cylinder 22 may drive the screen 15 to move horizontally out of the screen 12, and the discharging device 20 may further include a scraping member disposed on the screen 12, where the scraping member scrapes the sample of the screen 15 when the screen 15 moves horizontally out of the screen 12.
The weighing device 30 is arranged below the screening device 10 and comprises a weighing bracket 31, a weighing sensor 32 and a weighing bin 33, wherein the weighing sensor 32 is arranged on the weighing bracket, the weighing bin 33 is supported by the weighing sensor 32, and the weighing bin 33 is positioned under the screen 15. The bottom of the weigh bin 33 is provided with a discharge opening and the weigh device further includes a door panel mechanism for opening and closing the discharge opening. The door panel mechanism comprises a door panel 34, an air cylinder 35 and two connecting pieces 36. The two connecting pieces 36 are symmetrically arranged at the left and right sides of the door plate 34, one end of each connecting piece 36 is connected with the door plate 34, and the other end is rotatably connected with the weighing bin 33. The cylinder 35 is mounted on the weigh bin 33, and the telescopic rod of the cylinder 35 is connected with the door plate 34. The air cylinder 35 stretches and contracts to drive the door plate 34 to rotate around the connecting point of the connecting piece 36 and the weighing bin 33. The door panel mechanism further comprises two oil cups which are respectively arranged on the weighing bins 33, and the oil cups 32 can lubricate the connecting points of the connecting piece and the weighing bins.
The number of the weighing sensors 32 is plural and evenly distributed on the periphery of the weigh bin 33, and a shock pad 37 is provided between the weighing sensors 32 and the weigh bin 33. The weighing sensor 32 is connected to a ground line.
The weighing bracket 31 is provided with a fixed block 312 corresponding to the weighing sensor, the weighing sensor 32 is arranged on the fixed block 312, an anti-swing bolt 38 is further arranged between the fixed block 312 and the weighing bin 33, the anti-swing bolt 38 is vertically arranged, one end of the anti-swing screw 38 is fixedly connected with the weighing bin 33, and the other end of the anti-swing screw 38 movably penetrates through the fixed block 312.
The base 11 of the screening device is fastened to the weighing bracket 31 of the weighing device by means of bolts.
In operation, the screening can be performed according to the following steps:
firstly, driving a plurality of layers of screens 15 which are vertically arranged at intervals to vibrate by a motor 14, wherein the diameters of the screen holes of the screens 15 are sequentially reduced from top to bottom, and a sample is placed on the screen at the uppermost layer to start vibration screening;
step two, the sample is scattered on each layer of screen 15 after vibration screening, and the motor 14 stops vibrating;
step three, respectively weighing the sample weight on each layer of screen 15, and recording to obtain P 1 、P 2 、…、P n Adding the weight of the samples of each layer to obtain P Total (S) ，P Total (S) ＝P 1 +P 2 +…+P n ；
Step four, according to the obtained data P 1 、P 2 、…、P n P Total (S) Calculating the passing rate T of each layer of screen cloth 1 、T 2 、…、T n Finally according to the obtained passing rate T 1 、T 2 、…、T n And (5) drawing a sand grading curve.
Preferably, the motor 14 is vibrated for a sieving period of 5-15 minutes; the total weight of the sample is 30-50kg.
Preferably, the screens 15 are weighed by opening step by step from bottom to top, and after each screen is opened, the sample on the opened screen falls directly into the weighing deviceThe weighing device is connected with the PLC, the measured data is automatically stored in the PLC, and finally the PLC automatically calculates T 1 、T 2 、…、T n And generating a sand grading curve.
The foregoing description is only illustrative of the preferred embodiments of the present invention, and therefore should not be taken as limiting the scope of the invention, for all changes and modifications that come within the meaning and range of equivalency of the claims and specification are therefore intended to be embraced therein.
Claims (7)
1. A detection device of grit gradation, its characterized in that: comprises a screening device, a discharging device and a weighing device;
the screening device comprises a base, a screen body, an elastic component connected between the base and the screen body and a motor for driving the screen body to vibrate, wherein a plurality of layers of screens are arranged on the screen body, the screens are vertically arranged at intervals, and the diameters of the screens are sequentially reduced from top to bottom;
the discharging device is provided with a driving cylinder corresponding to each layer of screen body, the driving cylinder drives the screen to discharge, at least two modes of driving the screen to discharge are provided, one mode is that the driving cylinder drives the screen to overturn for discharging, the other mode is that the driving cylinder drives the screen to horizontally move out of the screen body, the discharging device also comprises a scraping part arranged on the screen body, and when the screen horizontally moves out of the screen body, the scraping part scrapes a sample of the screen;
the weighing device is arranged below the screening device and comprises a weighing bracket, a weighing sensor and a weighing bin, wherein the weighing sensor and the weighing bin are arranged on the weighing bracket, the weighing bin is supported by the weighing sensor and is positioned under the screen, a discharge opening is formed in the bottom of the weighing bin, and the weighing device further comprises a door plate mechanism for switching the discharge opening.
2. The sand grading detection device according to claim 1, wherein: the door plate mechanism comprises a door plate, an air cylinder and two connecting pieces, wherein the two connecting pieces are symmetrically arranged on the left side and the right side of the door plate, one end of each connecting piece is connected with the door plate, the other end of each connecting piece is rotationally connected with the weighing bin, the air cylinder is arranged on the weighing bin, and a telescopic rod of each air cylinder is connected with the door plate; the door plate mechanism further comprises two oil cups which are respectively arranged on the weighing bin, and the oil cups can lubricate the connecting points of the connecting piece and the weighing bin.
3. The sand grading detection device according to claim 1, wherein: the number of the weighing sensors is multiple and the weighing sensors are uniformly distributed on the periphery of the weighing bin, and a shock pad is arranged between the weighing sensors and the weighing bin; the weighing sensor is connected with a grounding wire.
4. A sand grading detection device according to claim 3, wherein: the weighing bracket is provided with a fixed block corresponding to the weighing sensor, the weighing sensor is arranged on the fixed block, an anti-swing bolt is further arranged between the fixed block and the weighing bin, the anti-swing bolt is vertically arranged, one end of the anti-swing screw is fixedly connected with the weighing bin, and the other end of the anti-swing screw movably penetrates through the fixed block.
5. The sand grading detection device according to claim 1, wherein: the elastic component comprises a spring and a spring seat, the spring seat is connected to the base, and the spring is arranged on the spring seat and provides supporting elastic force for the screen body; the motor is mounted on the screen.
6. The sand grading detection device according to claim 1, wherein: the base of the screening device and the weighing bracket of the weighing device are fixed together through bolts.
7. The sand grading detection device according to claim 1, wherein: these screens were 7 layers in total, and the screen mesh diameters of the screens were respectively from top to bottom: 4.75mm,2.36mm,1.18mm,0.6mm,0.3mm,0.15mm,0.075mm, or the mesh diameters of the screens are respectively from top to bottom: 37.5mm,31.5mm,26.5mm,19mm,13.2mm,9.5mm,4.75mm.
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| CN201710574521.1A CN107225083B (en) | 2017-07-14 | 2017-07-14 | Sand grading detection method and device using same |
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| CN201710574521.1A CN107225083B (en) | 2017-07-14 | 2017-07-14 | Sand grading detection method and device using same |
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| CN107225083B true CN107225083B (en) | 2023-06-20 |
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| CN108732071A (en) * | 2018-08-02 | 2018-11-02 | 贵州成智重工科技有限公司 | A kind of detection control apparatus and method of fineness modulus |
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| CN112756250B (en) * | 2020-12-21 | 2022-07-12 | 中国水利水电科学研究院 | Device for online identification and grading optimization of cemented sand gravel granules |
| CN113877814A (en) * | 2021-09-29 | 2022-01-04 | 同济大学 | Screening device for measuring machine-made sand grading and testing method |
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