CN111111827B - Device and method for preparing uniform sample - Google Patents
Device and method for preparing uniform sample Download PDFInfo
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- CN111111827B CN111111827B CN201911399542.XA CN201911399542A CN111111827B CN 111111827 B CN111111827 B CN 111111827B CN 201911399542 A CN201911399542 A CN 201911399542A CN 111111827 B CN111111827 B CN 111111827B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C1/00—Crushing or disintegrating by reciprocating members
- B02C1/14—Stamping mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
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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
-
- 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
-
- 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
- B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention relates to a device and a method for preparing a uniform sample.A first screw rod is connected to the output end of a first stepping motor in the device, a first sliding block is arranged on the first screw rod through an internal threaded hole, and the first sliding block is arranged in an upright post in a sliding way through a groove; one side of the first sliding block is fixedly connected with an impact head through a first connecting rod, a box body is arranged below the impact head, an impact end of the impact head penetrates into the box body through an opening, a sample table is arranged right below the impact end of the impact head at the bottom of the box body, a first layer of screen is arranged around the sample table, a second layer of screen with small aperture is connected below the first layer of screen, and a third layer of screen with small aperture is connected below the second layer of screen; in the method, the second layer of screen cloth and the third layer of screen cloth with the corresponding mesh numbers are calculated first and then are installed, the samples are placed on the sample table, then the first stepping motor is started, the samples with different sizes are separated, and after the weight of the samples required by the test is finished, the first stepping motor is closed, so that the uniformity of the samples is ensured.
Description
Technical Field
The invention belongs to the technical field of sample preparation, and relates to a device and a method for preparing uniform samples.
Background
In the production process of the electronic glass, the process temperature in each working procedure is set by taking the corresponding temperature of the electronic glass with certain viscosity as a reference, and comprises a melting temperature, a stirring temperature, a clarifying temperature, a forming temperature and the like. Therefore, in the development of electronic glass, testing of the corresponding viscosity at different temperatures is indispensable.
At present, the relation between the viscosity and the temperature of electronic glass is measured by a rotation method in the industry, namely, glass melt is filled between a coaxial rotating body and a crucible, different angular speeds are provided for the rotating body and the crucible, the rotating body and the crucible generate torsion moment due to viscous resistance of the glass melt, and the torsion moment is measured by a torsion moment measuring device, so that the viscosity of the glass melt can be obtained. Different temperatures correspond to different viscosities, a relation curve of the viscosity and the temperature is drawn according to a plurality of points which are tested, and then a fitting formula of the relation of the viscosity and the temperature is obtained, so that a temperature value can be obtained through the viscosity, and a viscosity value can be obtained through the temperature. It can be seen that the spin method is performed with the glass in the melt, and belongs to a high temperature test.
When a new glass material side study is carried out in a laboratory, the obtained glass sample is a whole glass with the size of about 120 multiplied by 60 multiplied by 10mm, small fragments are required to be manufactured before high-temperature test is carried out, the sample is wrapped by clean materials, the sample is subjected to current sample preparation method, the iron hammer is used for knocking the sample into fragments, 10-mesh undersize and 30-mesh oversize are taken for crystallization test, and the residual blocks are used for viscosity test.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the device and the method for preparing the uniform sample, which have the advantages of simple structure, convenient and safe operation and ensure the uniformity of the sample.
The invention is realized by the following technical scheme:
a preparation device of uniform samples comprises an impact head, a box body, a first stepping motor, a first screw rod, a first sliding block, a first connecting rod, a first supporting table and an upright post;
the first support table is provided with a stand column and a first stepping motor, the output end of the first stepping motor is connected with a first screw rod, the first screw rod is parallel to the stand column, a first internal threaded hole is formed in the first sliding block, the first sliding block is arranged on the first screw rod through the first internal threaded hole, a groove is formed in one side, close to the first sliding block, of the stand column, and the first sliding block is arranged in the stand column in a sliding mode through the groove;
the utility model discloses a first slider, including stand, first slider, second slider, first slider, stand, first slider, stand opposite one side is through first connecting rod fixedly connected with impact head, the below of impact head is provided with the box, the box is provided with the opening, the impact end of impact head is through the opening deep into the inside of box, the box bottom is located the impact end of impact head and is the sample platform directly under, the sample platform is used for holding the sample, be first layer screen cloth around the sample platform, the below of first layer screen cloth is connected with the second floor screen cloth, the aperture of second floor screen cloth is less than the aperture of first layer screen cloth, the below of second floor screen cloth is connected with the third layer screen cloth, the aperture of third layer screen cloth is less than the second floor screen cloth, the third layer screen cloth is placed on the workstation.
Preferably, the device also comprises a second connecting rod, a second sliding block, a second screw rod, a second stepping motor and a second supporting table;
the box is provided with the second brace table with the relative one side of first brace table, is provided with the second step motor on the second brace table, and the output of second step motor sets up towards the box, and the output of second step motor is connected with the second screw rod, is provided with the second internal thread hole in the second slider, and the second slider passes through the setting of second internal thread hole on the second screw rod, through second connecting rod fixed connection between second slider and the box.
Preferably, a protective cover is arranged at the upper end of the box body, and an opening is arranged on the protective cover.
Further, a handle is arranged on the protective cover.
Preferably, the first layer of screen cloth is symmetrically and horizontally extended along the central position of the bottom of the box body and then vertically and upwards bent to form a first limit groove with the box body; the second layer of screen cloth is symmetrically and horizontally arranged in an outward extending mode along the center of the second layer of screen cloth, then is vertically bent upwards and then horizontally extends inwards, finally is vertically bent downwards to form a first blocking wall, and the first blocking wall is buckled in the first limiting groove;
the second layer of screen cloth is bent vertically upwards after being horizontally and outwards extended along the first blocking wall, and forms a second limit groove with the vertical edge of the first blocking wall; the third layer of screen cloth extends outwards along its central point symmetry level, and then extends inwards after vertical upwards buckling, and the second blocking wall that forms of final vertical buckling is blocked in the second spacing groove to the second.
Preferably, the first layer of screen, the second layer of screen and the third layer of screen are all made of stainless steel.
Preferably, the first layer of screen, the second layer of screen and the third layer of screen are all round, the second layer of screen is 10-20 mm larger than the first layer of screen in diameter, and the third layer of screen is 10-20 mm larger than the second layer of screen in diameter.
A preparation method of a uniform sample, based on the preparation device of the uniform sample, comprises the following steps,
step 1, calculating the screen mesh number required by a second screen mesh, a third screen mesh and a third screen mesh according to the required sample particle size, and then selecting the second screen mesh and the third screen mesh with the corresponding mesh number;
step 2, connecting the second layer of screen mesh obtained in the step 1 below the first layer of screen mesh, connecting the third layer of screen mesh obtained in the step 1 below the second layer of screen mesh, and then placing the third layer of screen mesh on a workbench;
step 3, placing the sample on a sample table at the bottom of the box body, starting a first stepping motor, driving an impact head to move by the first stepping motor through a first sliding block, crushing the sample, sieving the sample, and separating samples with different sizes;
and 4, after the step 3 is carried out for a set time, taking down the third layer of screen cloth and the second layer of screen cloth, respectively weighing the weight of the samples, closing the first stepping motor when the weight of the samples meets the test requirement, and installing the second layer of screen cloth and the third layer of screen cloth again when the weight of the samples does not meet the test requirement, wherein the first stepping motor continuously breaks and sieves the samples until the weight of the samples meets the test requirement, closing the first stepping motor, and completing the preparation of uniform samples.
Further, in the step 3, the first stepping motor is started, and meanwhile, the second stepping motor is started, and drives the box body to move left and right through the second sliding block;
and in the step 4, when the weight of the sample meets the test requirement, the first stepping motor and the second stepping motor are closed, and when the weight of the sample does not meet the test requirement, the second layer of screen cloth and the third layer of screen cloth are installed again, and then the first stepping motor and the second stepping motor continue to crush and screen the sample until the weight of the sample meets the test requirement, and the first stepping motor and the second stepping motor are closed.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the uniform sample preparation device, the upright post and the first stepping motor are arranged on the first supporting table, the output end of the first stepping motor can be connected with the first screw rod, and the first sliding block is arranged on the first screw rod, so that the upright post and the first stepping motor can be stabilized by the first supporting table, and the first stepping motor drives the first screw rod to rotate left and right so that the first sliding block can slide up and down in the upright post; the impact end of the impact head penetrates into the box body through the opening, a first layer of screen mesh is arranged around the sample table, a second layer of screen mesh is connected to the lower side of the first layer of screen mesh, the second layer of screen mesh is smaller than the first layer of screen mesh in pore diameter, a third layer of screen mesh is connected to the lower side of the second layer of screen mesh, and the third layer of screen mesh is smaller than the second layer of screen mesh in pore diameter, so that the impact head can crush and screen a glass sample while sieving, and can obtain uniform samples with a required particle size range according to the mesh numbers of the second layer of screen mesh and the third layer of screen mesh, therefore, after the glass sample for crystallization test is removed when the device is used, the uniformity of the sample during viscosity test is ensured, and test errors caused by uneven melting of the sample during high-temperature test are avoided; the device can obtain uniform samples with the required particle size range, and provides convenience for experimental study of scientific research institutions and other study units.
Further, the box body drives the second layer of screen cloth and the third layer of screen cloth to move left and right through the second stepping motor, so that samples with different granularity can be separated more quickly, and the efficiency of preparing uniform samples is improved.
Furthermore, the upper end of the box body is provided with a protective cover, so that the risk of injury caused by glass sputtering possibly occurring during manual sample preparation is avoided.
According to the preparation method of the uniform sample, the required screen mesh number is calculated according to the required sample particle size, then the second layer of screen mesh and the third layer of screen mesh are installed, after the sample is placed, the height and the frequency of the sample impacted by the sample impact head are adjusted through the first stepping motor so as to separate out the sample particles with uniform size, and the operation of the first stepping motor is stopped according to whether the sample weight meets the test requirement or not, in particular, the test error caused by the non-uniformity of the glass sample after melting in the high-temperature test process can be avoided; the second layer of screen cloth and the third layer of screen cloth can separate out the sample that the degree of consistency is good, have improved work efficiency.
Further, the second step motor is used for adjusting the movement frequency and the displacement of the second layer of screen cloth and the third layer of screen cloth, so that samples with different granularity can be separated more quickly, and the working efficiency is improved.
Drawings
FIG. 1 is a schematic structural diagram of a device for preparing uniform samples according to the present invention.
Fig. 2 is a schematic view of the connection of the first slider and the upright in fig. 1.
Fig. 3 is a top view of the first screen of fig. 1.
Fig. 4 is a top view of the second screen of fig. 1.
In the figure: 1-an impact head; 2-a box body; 3-sample; 4-a first layer of screen; 5-a second layer of screen; 6-a third layer of screen; 7-a first stepper motor; 8-a first screw; 9-a first slider; 10-a first link; 11-a protective cover; 12-bolts; 13-a first limit groove; 14-a first barrier wall; 15-handle; 16-sample stage; 17-a first support table; 18-a second limit groove; 19-a second barrier wall; 20-a second link; 21-a second slider; 22-a second screw; 23-a second stepper motor; 24-a second support table; 25-stand columns; 26-groove.
Detailed Description
The invention will now be described in further detail with reference to specific examples, which are intended to illustrate, but not to limit, the invention.
The invention relates to a preparation device of a uniform sample, which is shown in figure 1, and comprises an impact head 1, a box body 2, a first stepping motor 7, a first screw rod 8, a first sliding block 9, a first connecting rod 10, a first supporting table 17 and a stand column 25, wherein the bottom of the box body 2 comprises a first layer of screen 4 and a sample table 16, the first layer of screen 4 and the box body 2 are integrated, the middle of the first layer of screen 4 is of a solid structure, and the middle part of the first layer of screen 4 is of a complete circle, in particular to the sample table 16;
the first supporting table 17 is provided with a stand column 25 and a first stepping motor 7, the output end of the first stepping motor 7 is connected with a first screw rod 8, the first screw rod 8 is parallel to the stand column 25, a first internal threaded hole is formed in the first sliding block 9, the first sliding block 9 is arranged on the first screw rod 8 through the first internal threaded hole, a groove 26 is formed in one side, close to the first sliding block 9, of the stand column 25, the first sliding block 9 is slidably arranged in the stand column 25 through the groove 26, and the first sliding block is connected with the stand column as shown in fig. 2;
the first slider 9 is provided with the box 2 through first connecting rod 10 fixedly connected with impact head 1 with one side that stand 25 is relative, the below of impact head 1 is provided with the box 2, the box 2 is provided with the opening, the impact end of impact head 1 is through the opening deep into the inside setting of box 2, be sample platform 16 under the impact end of box 2 bottom is located impact head 1, sample platform 16 is used for holding sample 3, sample platform 16 is first layer screen cloth 4 all around, the below of first layer screen cloth 4 is connected with second layer screen cloth 5, second layer screen cloth 5 is less than the aperture of first layer screen cloth 4, the below of second layer screen cloth 5 is connected with third layer screen cloth 6, third layer screen cloth 6 is less than the aperture of second layer screen cloth 5, third layer screen cloth 6 is placed on the workstation, top view of second layer screen cloth 5 and third layer screen cloth 6 is as shown in fig. 3 and fig. 4.
The box 2 is provided with the second brace table 24 with the opposite side of first brace table 17, is provided with the second step motor 23 on the second brace table 24, and the output of second step motor 23 sets up towards box 2, and the output of second step motor 23 is connected with second screw rod 22, is provided with the second internal thread hole in the second slider 21, and second slider 21 passes through the setting of second internal thread hole on second screw rod 22, passes through second connecting rod 20 fixed connection between second slider 21 and the box 2.
The upper end of the box body 2 is provided with a protective cover 11, an opening is formed in the center of the protective cover 11, the first screw rod 8 is driven to rotate through the first stepping motor 7, so that the first sliding block 9 is driven to move up and down, and the first sliding block 9 drives the impact head 1 to move up and down to impact the sample 3.
The protective cover 11 is fixed on the box body 2 through the bolts 12, and the protective cover 11 is provided with a handle 15 for operation, and the protective cover can be arranged to prevent the glass sample from being injured due to the sputtering of broken glass in the process of impacting the glass sample.
The first layer of screen 4 is symmetrically and horizontally extended along the central position of the bottom of the box body 2, then is vertically bent upwards, and forms a first limit groove 13 with the box body 2; the second layer of screen cloth 5 extends outwards along its central point symmetry level, and afterwards extends inwards after vertical upwards buckling, and finally downwards buckling perpendicularly forms first blocking wall 14, and first blocking wall 14 buckle in first spacing groove 13, and first blocking wall 14 can not drop at vibration in-process with first spacing groove 13 chucking.
The first layer of screen 4, the second layer of screen 5 and the third layer of screen 6 are all made of stainless steel, and the second layer of screen 5 is bent vertically upwards after being horizontally and outwards extended along the first blocking wall 14, and forms a second limit groove 18 with the vertical edge of the first blocking wall 14; the third layer of screen 6 extends outwards along its central point symmetry level, and then extends inwards after vertical upwards buckling, and finally downwards buckling perpendicularly forms second blocking wall 19, and second blocking wall 19 buckle in second spacing groove 18, and second blocking wall 19 can not drop in the vibration in-process with second spacing groove 18 chucking.
The first layer of screen 4, the second layer of screen 5 and the third layer of screen 6 are all round, the whole diameter of the second layer of screen 5 is 10-20 mm larger than that of the first layer of screen 4, and the aperture of the second layer of screen 5 is smaller than that of the first layer of screen 4; the third layer of screen 6 is 10-20 mm larger than the whole diameter of the second layer of screen 5, and the third layer of screen 6 is smaller than the pore diameter of the second layer of screen 4.
The second connecting rod 20 is welded with the second sliding block 21, and the second screw rod 22 is driven to rotate through the second stepping motor 23, so that the second sliding block 21 is driven to slide left and right, the second sliding block 21 drives the box body and each layer of screen to move left and right, samples with different particle sizes are separated through step-by-step screen vibration, and uniformity of various test samples is guaranteed.
The box body 2 can be connected with 3-5 layers of screens layer by layer according to the scheme so as to separate samples with different granularity, provide uniform samples for different tests, save labor and improve working efficiency.
According to the preparation method of the uniform sample, according to the granularity of the required sample, the preparation method can be realized by the existing formula:
screen mesh diameter μm (1) is equal to 14832.4/mesh size
Calculating the required screen mesh number;
the method comprises the following steps:
the first step: according to the required particle size of the sample, calculating the required screen mesh number of the second layer of screen 5 and the third layer of screen 6 through a formula (1), and then selecting the second layer of screen 5 and the third layer of screen 6 with corresponding mesh numbers;
and a second step of: clamping the second layer of screen 5 to the first limit groove 13 of the first layer of screen 4 through the first blocking wall 14, and clamping the third layer of screen 6 to the second limit groove 18 of the second layer of screen 5 through the second blocking wall 19;
and a third step of: opening the protective cover 11, placing the annealed glass sample 3 on a sample table 16 in the box body 2, and fixing the protective cover 11 and the box body 2 through bolts 12 to prevent broken glass from splashing in the sample preparation process;
fourth step: adjusting the first stepping motor 7 to enable the impact head 1 to move up and down to impact on a sample, and adjusting the second stepping motor to enable the box body 2 to drive the first layer of screen 4, the second layer of screen 5 and the third layer of screen 6 to move left and right, so that fragments with different sizes are separated through the screens;
fifth step: after the fourth step is carried out for 10-20 min, the third layer of screen 6 and the second layer of screen 5 are taken down, the weight of the sample is respectively weighed, and when the test requirement is met, the program is stopped; if the weight of the sample does not meet the test requirement, continuing the second step and the fourth step until the weight of the sample meets the test requirement.
And ultrasonically cleaning a sample with the weight meeting the test requirement with absolute ethyl alcohol for one time to remove oily impurities and then ultrasonically cleaning with purified water for 2 times to remove water-soluble substances and other floaters, and drying the sample in an oven to obtain the finished product.
As shown in FIG. 1, in the apparatus for preparing uniform sample, 60g of glass particles with a diameter of 0.5-1.5 mm is prepared for crystallization test, 200g of glass fragments with a diameter of 1.5-3 mm is prepared for viscosity test, and the preparation steps are as follows:
the first step: according to the formula:
the inner diameter (particle diameter) of the screen (mu m) is approximately equal to 14832.4/mesh number of the screen
Calculating 0.5-1.5 mm glass particles as 10 mesh screen undersize and 30 mesh screen oversize;
the glass fragments with the diameter of 1.5-3 mm are 5-mesh screen undersize and 10-mesh screen oversize. Therefore, the first layer of screen is 5 meshes, the second layer of screen is 10 meshes, and the third layer of screen is 30 meshes;
and a second step of: clamping a 10-mesh second-layer screen with the diameter of 280mm onto a first limit groove of a circular 5-mesh first-layer screen with the outer diameter of 260mm and the inner diameter of 180mm through a first blocking wall, and clamping a 30-mesh third-layer screen with the diameter of 300mm onto the first limit groove of the second-layer screen through a second blocking wall clamping groove;
and a third step of: holding the handle 15, opening the protective cover 11, placing the annealed glass sample on a sample table 16 with the diameter of 180mm at the bottom of the box body, and fixing the protective cover 11 and the box body 2 through the bolts 12 to prevent broken glass from splashing in the sample preparation process;
fourth step: adjusting the first stepping motor to enable the impact head to move up and down at the speed of 50 times/min to impact on the sample, wherein the moving distance is set to be 100mm, and meanwhile, the box body 2 is set to drive the movement frequency of the first layer of screen, the second layer of screen and the third layer of screen to be 60 times/min, and the displacement is 50mm, so that the glass sample is crushed and screened at the same time, and samples with different sizes are separated;
fifth step: and after the fourth step is carried out for 15min, the third layer of screen cloth and the second layer of screen cloth are taken down, the weights of the samples are respectively weighed, the weights of the two samples meet the test requirement, and the procedure is stopped.
And ultrasonically cleaning a sample with the weight meeting the test requirement with absolute ethyl alcohol for one time, ultrasonically cleaning with purified water for 2 times, then drying the sample in an oven, and respectively testing after drying.
While the foregoing is directed to embodiments of the present invention, various modifications and substitutions may be made by those skilled in the art without departing from the principles of the present invention, and these modifications and substitutions are intended to be within the scope of the present invention.
Claims (3)
1. A method for preparing a uniform sample, which is characterized by comprising an impact head (1), a box body (2), a first stepping motor (7), a first screw (8), a first sliding block (9), a first connecting rod (10), a first supporting table (17) and a stand column (25);
the novel automatic feeding device is characterized in that an upright post (25) and a first stepping motor (7) are arranged on the first supporting table (17), the output end of the first stepping motor (7) is connected with a first screw rod (8), the first screw rod (8) is parallel to the upright post (25), a first internal threaded hole is formed in the first sliding block (9), the first sliding block (9) is arranged on the first screw rod (8) through the first internal threaded hole, a groove (26) is formed in one side, close to the first sliding block (9), of the upright post (25), and the first sliding block (9) is arranged in the upright post (25) in a sliding mode through the groove (26);
the device is characterized in that one side of the first sliding block (9) opposite to the upright post (25) is fixedly connected with an impact head (1) through a first connecting rod (10), a box body (2) is arranged below the impact head (1), an opening is formed in the box body (2), an impact end of the impact head (1) penetrates into the box body (2) through the opening, a sample table (16) is arranged right below the impact end of the impact head (1) at the bottom of the box body (2), the sample table (16) is used for containing a sample (3), a first layer of screen (4) is arranged around the sample table (16), a second layer of screen (5) is connected to the lower side of the first layer of screen (4), the second layer of screen (5) is smaller than the aperture of the first layer of screen (4), a third layer of screen (6) is connected to the lower side of the second layer of screen (5), the third layer of screen (6) is smaller than the aperture of the second layer of screen (5), and the third layer of screen (6) is placed on a workbench;
the device also comprises a second connecting rod (20), a second sliding block (21), a second screw (22), a second stepping motor (23) and a second supporting table (24);
a second supporting table (24) is arranged on one side, opposite to the first supporting table (17), of the box body (2), a second stepping motor (23) is arranged on the second supporting table (24), the output end of the second stepping motor (23) faces the box body (2), the output end of the second stepping motor (23) is connected with a second screw rod (22), a second internal threaded hole is formed in a second sliding block (21), the second sliding block (21) is arranged on the second screw rod (22) through the second internal threaded hole, and the second sliding block (21) is fixedly connected with the box body (2) through a second connecting rod (20);
the first layer of screen cloth (4) is symmetrically and horizontally extended along the central position of the bottom of the box body (2) and then vertically and upwards bent, and forms a first limit groove (13) with the box body (2); the second layer of screen cloth (5) is symmetrically and horizontally arranged in an outward extending mode along the center of the screen cloth, then is vertically bent upwards and then horizontally extends inwards, finally is vertically bent downwards to form a first blocking wall (14), and the first blocking wall (14) is buckled in the first limiting groove (13);
the second layer of screen cloth (5) is bent vertically upwards after being horizontally and outwards extended along the first blocking wall (14), and forms a second limit groove (18) with the vertical edge of the first blocking wall (14); the third layer of screen (6) is symmetrically and horizontally arranged in an outward extending mode along the center of the screen, then is vertically bent upwards and then horizontally extends inwards, finally is vertically bent downwards to form a second blocking wall (19), and the second blocking wall (19) is buckled in the second limiting groove (18);
the first layer of screen cloth (4), the second layer of screen cloth (5) and the third layer of screen cloth (6) are all round, the diameter of the second layer of screen cloth (5) is 10-20 mm larger than that of the first layer of screen cloth (4), and the diameter of the third layer of screen cloth (6) is 10-20 mm larger than that of the second layer of screen cloth (5);
the upper end of the box body (2) is provided with a protective cover (11), and an opening is formed in the protective cover (11);
comprises the following steps of the method,
step 1, calculating the screen mesh number required by a second layer of screen (5) and a third layer of screen (6) according to the required sample particle size, and then selecting the second layer of screen (5) and the third layer of screen (6) with corresponding mesh numbers;
step 2, connecting the second layer of screen cloth (5) obtained in the step 1 under the first layer of screen cloth (4), connecting the third layer of screen cloth (6) obtained in the step 1 under the second layer of screen cloth (5), and then placing the third layer of screen cloth (6) on a workbench;
step 3, placing a sample on a sample table (16) at the bottom of the box body (2), starting a first stepping motor (7), starting a second stepping motor (23), driving the impact head (1) to reciprocate up and down by the first stepping motor (7) through a first sliding block (9), driving the box body (2) to move left and right by the second stepping motor (23) through a second sliding block (21), and further crushing and sieving the sample, and separating samples with different sizes;
and 4, after the step 3 is carried out for a set time, taking down the third layer of screen (6) and the second layer of screen (5), respectively weighing the weights of the samples, closing the first stepping motor (7) and the second stepping motor (23) when the weights of the samples meet the test requirement, and installing the second layer of screen (5) and the third layer of screen (6) again when the weights of the samples do not meet the test requirement, wherein the first stepping motor (7) and the second stepping motor (23) continuously crush the samples and screen the samples until the weights of the samples meet the test requirement, and closing the first stepping motor (7) and the second stepping motor (23) to finish the preparation of uniform samples.
2. A method of preparing a homogeneous sample according to claim 1, characterized in that the protective cover (11) is provided with a handle (15).
3. The method for preparing a uniform sample according to claim 1, wherein the first layer of screen (4), the second layer of screen (5) and the third layer of screen (6) are all made of stainless steel.
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