Device and method for detecting content of mica in machine-made sand

Abstract

The invention discloses a device for detecting the content of mica in machine-made sand. The device comprises a separation tank which is connected with a support frame; the separating tank is used for separating mica in machine-made sand, and the supporting frame is used for supporting and driving the separating tank to rotate; a water inlet mechanism is arranged at the bottom end of the separation tank; a plurality of cavities are formed in the separation tanks, a plurality of kneading barrels are arranged at the tops of the separation tanks, each kneading barrel is provided with a discharging pipe and a feeding pipe, each discharging pipe is provided with a feeding pipe, and the feeding pipes of different separation tanks are aligned to different cavities; and a rubbing mechanism is arranged in the rubbing cylinder. According to the device and method for detecting the mica content in the machine-made sand, rapid separation of gravel particles and flaky mica particles in multiple machine-made sand with different particle sizes can be achieved at the same time in one device, and the detection efficiency is improved; the machine-made sand is rubbed before separation, so that mica adhered to the machine-made sand is separated from the machine-made sand, the subsequent separation effect is ensured, and the detection accuracy is further ensured.

Description

Technical Field

[0001] The invention relates to the technical field of mica content detection, and in particular to a device and a method for detecting mica content in machine-made sand. Background Art

[0002] Machine-made sand is mainly used for concrete with strength grade C60 and below in construction, municipal administration, transportation and other construction projects. It can also be used in water conservancy and hydropower projects when the corresponding technical requirements are met. This machine-made sand is made of rocks, pebbles, mine waste rocks and tailings, etc., and is made by mechanical crushing, shaping, screening, powder control and other processes after soil removal. Since the raw materials are rich in mica, a large amount of free mica will be formed in the machine-made sand after systematic crushing. If the mica content is too high, the mica will absorb moisture when the concrete is mixed, increase the water consumption of the concrete, reduce the adhesion between the sand and gravel and the cement, and the strength of the concrete will also decrease. The frost resistance and impermeability will be greatly reduced and the service life will be shortened.

[0003] Therefore, accurate and rapid quantitative detection of mica content in machine-made sand is of great significance for product quality control and process optimization.

[0004] The current national standard for detecting mica content in artificial sand, GB / T 14684-2022 "Construction Sand", is based on a certain sample size and is manually selected for quantitative detection under a 3-5x magnifying glass. This method is time-consuming and labor-intensive, and has large human errors, and cannot accurately detect the content of free mica in artificial sand; some technologies use X-ray diffraction analysis technology to quickly detect the mica content in artificial sand. This method has high equipment costs and is difficult to use industrially.

[0005] Currently, there is no low-cost, fast and accurate method for detecting the mica content in machine-made sand; therefore, it is necessary to develop an efficient and accurate device and method for detecting the mica content in machine-made sand.

[0006] Moreover, during testing, the artificial sand and mica are often stuck together, making it difficult to distinguish them during testing, thus affecting the test results. Summary of the invention

[0007] The main purpose of the present invention is to provide a device and method for detecting the mica content in machine-made sand, so as to solve the problems of low efficiency and inaccurate detection results in the prior art for detecting the mica content in machine-made sand.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0009] A device for detecting mica content in machine-made sand comprises a separation tank connected to a support frame; the separation tank is used to separate mica in the machine-made sand, and the support frame is used to support and drive the separation tank to rotate;

[0010] A water inlet mechanism is provided at the bottom end of the separation tank;

[0011] A plurality of cavities are arranged in the separation tank, a plurality of kneading cylinders are arranged on the top of the separation tank, the kneading cylinders are provided with a discharge pipe and a feed pipe, the discharge pipe is provided with a feeding pipe, and the feeding pipes of different separation tanks are aligned with different cavities;

[0012] A kneading mechanism is arranged in the kneading cylinder.

[0013] In a preferred solution, the separation tank comprises an outer tank body connected to the support frame, wherein the outer tank body is provided with an inner tank body; a plurality of partitions are provided in the outer tank body to form a plurality of cavities;

[0014] The inner wall of the inner tank body is provided with a plurality of grooves, and a plurality of groove fine holes are provided in the grooves;

[0015] Multiple water inlet cavities are formed between the outer tank body, the inner tank body and the partition, and different water inlet cavities are connected to different cavities through groove pores and grooves;

[0016] A connecting seat is provided at the bottom of the outer tank body, and a water inlet mechanism communicating with the water inlet cavity is provided at the bottom of the connecting seat;

[0017] A plurality of sand discharge pipes are arranged at the bottom of the connection seat, and a plurality of sand discharge holes are arranged inside the connection seat, and the sand discharge holes are connected with the sand discharge pipes; a control valve is arranged inside the sand discharge pipes;

[0018] A top cover is provided on the top of the outer tank body, and a plurality of feed holes are provided on the top cover; the partition plate extends into the top cover;

[0019] The feed hole is used to supply the machine-made sand discharged from the feed pipe into the cavity;

[0020] A plurality of discharge holes are arranged in the top cover, and the discharge holes are used for discharging mica.

[0021] In a preferred solution, the support frame includes a first support ring and a second support ring sleeved outside the separation tank, and the first support ring and the second support ring are provided with a plurality of support rods;

[0022] A bearing is provided between the first support ring, the second support ring and the separation tank;

[0023] The second support ring is provided with a first motor, and a driving gear is provided at the output end of the first motor. The driving gear is located inside the second support ring; a gear ring is fixedly connected to the outer wall of the separation tank, and the gear ring is meshed with the driving gear.

[0024] In a preferred solution, a collecting groove is provided at the top of the outer tank body, the collecting groove is annular and is located below the discharge hole; a plurality of discharge pipes are provided at the bottom of the collecting groove;

[0025] The collecting tank is fixedly connected to the supporting rod and rotatably connected to the outer tank body.

[0026] In a preferred solution, the water inlet mechanism includes a water inlet sleeve connected to the connecting seat, the water inlet sleeve is provided with a connecting pipe, the connecting pipe is provided with a liquid rotary joint, the liquid rotary joint is provided with an external pipe, and the external pipe is provided with an electric rotary joint;

[0027] A plurality of intermediate tubes connected to the water inlet cavity are arranged in the connecting seat. The intermediate tubes are communicated with the water inlet sleeve. The intermediate tubes are provided with valves and sensors. The sensors are used to detect the hydraulic pressure in the water inlet cavity.

[0028] In a preferred solution, the kneading mechanism includes a reducer arranged on the side of the kneading cylinder, the reducer is provided with a second motor, and the output shaft of the second motor is connected to the input end of the reducer;

[0029] A kneading roller is arranged in the kneading cylinder, and elastic shafts are arranged at both ends of the kneading roller;

[0030] One of the elastic shafts is connected to the output end of the reducer;

[0031] The surface of the kneading roller is provided with a plurality of guide bars, and the guide bars are arranged obliquely.

[0032] In the preferred solution, a fixed plate is provided in the kneading cylinder, and the kneading roller is located on the side of the fixed plate away from the feed pipe;

[0033] The elastic shaft is connected to the output end of the reducer through a rotating shaft;

[0034] The rotating shaft is provided with a plurality of second kneading discs, and the kneading cylinder is provided with a plurality of first kneading discs, and the first kneading discs and the second kneading discs are arranged alternately;

[0035] The first kneading plate and the second kneading plate are located below the feed pipe;

[0036] The first kneading disc is rotatably connected to the rotating shaft and is fixed to the kneading cylinder.

[0037] In a preferred embodiment, the kneading cylinder includes a connected round cylinder and a square cylinder;

[0038] The feed pipe is connected to the round cylinder, and the discharge pipe is connected to the square cylinder;

[0039] A support plate is provided at the connection between the round cylinder and the square cylinder, and the kneading rod is located inside the round cylinder;

[0040] One of the elastic shafts is connected to the output end of the reducer, and the other elastic shaft is connected to the support plate;

[0041] The elastic shaft is connected with a first bevel gear, a connecting shaft is arranged in the square cylinder, and the connecting shaft is provided with a second bevel gear meshing with the first bevel gear;

[0042] A plurality of movable shafts are arranged in the square tube, and the movable shafts are connected with the connecting shafts through a belt transmission mechanism;

[0043] A third kneading disk is provided at the bottom of the movable shaft;

[0044] A plug-in rod is arranged on the top of the third kneading disc. The plug-in rod is slidably extended to the inside of the movable shaft. A limit block is arranged on the top of the plug-in rod. A stabilizing spring is arranged on the top of the limit block.

[0045] In a preferred embodiment, the diameters of the groove pores in different cavities are different.

[0046] A method for detecting mica content in machine-made sand comprises the following steps:

[0047] S1, take M grams of dry machine-made sand sample, sieve out the machine-made sand particles larger than 4.75 mm and smaller than 0.3 mm, and then weigh to obtain m1;

[0048] The remaining 4.75-0.3 mm machine-made sand particles are sieved into 3-6 portions from large to small particle sizes;

[0049] S2, water inlet, forming backwash water in the separation tank;

[0050] Knead 3-6 portions of machine-made sand separately;

[0051] S3. The kneaded machine-made sand is fed into different chambers, the separation tank rotates, and the machine-made sand and water are mixed into mortar;

[0052] S4, the separation tank keeps rotating at high speed to generate a centrifugal force field. The mortar is thrown to the inner wall of the separation tank under the action of centrifugal force and fills the groove from the bottom. When the amount of slurry in the groove reaches the corresponding capacity, a fluidized bed begins to form;

[0053] S5, machine-made sand particles and flaky mica particles move radially under the action of backwash water, keeping the fluidized bed in a loose state;

[0054] Under the combined effect of centrifugal force and backwash water force, the machine-made sand particles can overcome the radial resistance of the backwash water and replace the position occupied by the mica particles in the fluidized bed through infiltration migration and remain in the groove; while the flaky mica particles are difficult to overcome the backwash water force due to the small centrifugal force, and flow upward under the combined effect of the axial water flow force and the axial component of the centrifugal force, thereby achieving the purpose of separating the machine-made sand particles from the flaky mica particles;

[0055] S6. After all the flaky mica particles in the chamber have flowed out, the separation tank stops rotating while the backwash water is kept on, and then the machine-made sand particles in the groove are discharged;

[0056] S7, filter and dry the flaky mica particles, weigh them to get m2, and calculate the mica content p in the sand:

[0057] In a preferred embodiment, in step S1, the particles are screened into four portions according to four particle sizes: 4.75 mm to 2.36 mm, 2.36 mm to 1.18 mm, 1.18 mm to 0.6 mm, and 0.6 mm to 0.3 mm;

[0058] The backwash water pressure of different cavities is controlled by valves, and sensors are provided to detect the water pressure.

[0059] In a preferred embodiment, in step S6, the drying temperature is 90-100°C.

[0060] In a preferred embodiment, in step S6, the drying time is 0.5 to 1 hour.

[0061] The present invention provides a device and method for detecting mica content in machine-made sand. By adopting the above scheme, the following beneficial effects are achieved:

[0062] 1. It can realize the rapid separation of sand and gravel particles and flaky mica particles in machine-made sand of multiple different particle sizes in one device, thus improving the detection efficiency.

[0063] 2. Setting the pore diameter to match the size of machine-made sand and controlling the backwash water pressure can ensure the accuracy of mica separation, ensure the separation effect and improve the detection accuracy.

[0064] 3. The detection method is simple to operate, the detection device has a simple structure, and the detection cost is lower.

[0065] 4. Before separation, the machine-made sand is kneaded to separate the mica attached to the machine-made sand from the machine-made sand, ensuring the effect of subsequent separation and further ensuring the accuracy of detection.

[0066] 5. It has a variety of kneading methods to adapt to different kneading needs, ensure the kneading effect, and thus ensure the accuracy of detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0068] Figure 1 This is a schematic structural diagram of a device for detecting mica content in machine-made sand according to the present invention;

[0069] Figure 2 This is a schematic structural diagram of a device for detecting mica content in machine-made sand according to the present invention;

[0070] Figure 3 This is a front view of a device for detecting mica content in machine-made sand according to the present invention;

[0071] Figure 4 This is a schematic diagram of the internal structure of a device for detecting mica content in machine-made sand according to the present invention;

[0072] Figure 5 This is a schematic diagram of the top view of a device for detecting mica content in machine-made sand according to the present invention;

[0073] Figure 6 This is a schematic diagram of the structure of the second support ring of the present invention;

[0074] Figure 7 This is a schematic diagram of the structure of the first support ring of the present invention;

[0075] Figure 8 This is a schematic diagram of the structure of an embodiment of the kneading mechanism of the present invention;

[0076] Fig. 9 This is a schematic diagram of the structure of an embodiment of the kneading mechanism of the present invention;

[0077] Fig.10 This is a schematic diagram of the structure of an embodiment of the kneading mechanism of the present invention;

[0078] Fig.11 This is a schematic diagram of the separation principle of mica particles and sand and gravel particles.

[0079] In the figure:

[0080] Separation tank 1, outer tank body 101, connecting seat 102, inner tank body 103, partition 104, groove 105, groove pore 106, water inlet chamber 107, top cover 108, feed hole 109, sand discharge pipe 110, sand discharge hole 111, discharge hole 112, support frame 2, support rod 201, first support ring 202, second support ring 203, first motor 204, driving gear 205, gear ring 206, bearing 207, water inlet mechanism 3, water inlet sleeve 301, connecting pipe 302, liquid rotary joint 303, external pipe 304, electric rotary joint 305, intermediate pipe 306, valve Door 307, collecting trough 4, discharge pipe 401, kneading cylinder 5, feeding pipe 501, discharging pipe 502, feeding pipe 503, cylinder 511, square cylinder 512, kneading mechanism 6, reducer 601, second motor 602, kneading roller 603, elastic shaft 604, fixed plate 611, rotating shaft 612, first kneading disk 613, second kneading disk 614, guide strip 621, support plate 631, first bevel gear 632, connecting shaft 633, second bevel gear 634, movable shaft 635, belt transmission mechanism 636, third kneading disk 637, plug-in rod 638, stabilizing spring 639. DETAILED DESCRIPTION

[0081] Embodiment 1:

[0082] like Figure 1 , 2, 3, 4, 5, 6 and 7, a device for detecting mica content in machine-made sand comprises a separation tank 1, and the separation tank 1 is connected to a support frame 2; the separation tank 1 is used to separate mica in the machine-made sand, and the support frame 2 is used to support and drive the separation tank 1 to rotate;

[0083] A water inlet mechanism 3 is provided at the bottom end of the separation tank 1;

[0084] There are multiple cavities in the separation tank 1, and multiple kneading cylinders 5 are provided on the top of the separation tank 1. The kneading cylinder 5 is provided with a discharge pipe 502 and a feed pipe 501. The discharge pipe 502 is provided with a feeding pipe 503. The feeding pipes 503 of different separation tanks 1 are aligned with different cavities; the feeding at the feed pipe 501 can be achieved through the existing conveyor, and the feeding method can also be selected according to the actual situation on site, and this application does not impose any restrictions.

[0085] A kneading mechanism 6 is provided in the kneading cylinder 5 .

[0086] The kneading cylinder 5, the discharge pipe 502 and the feed pipe 503 are not in contact with the separation tank 1; the kneading cylinder 5 is installed on the work station with a mounting frame, and the mounting frame can be a commonly used metal frame. There is no restriction on the specific structure of the mounting frame, and it only needs to ensure the stability of the kneading cylinder 5 and the position requirements of this application. The mounting frame of the conveyor can be referred to, and it is determined according to the actual working environment;

[0087] The kneading cylinder 5 can also be directly fixed to the support frame 2 using a mounting frame, depending on actual needs.

[0088] Before separating mica from machine-made sand, the kneading mechanism 6 is used to process the machine-made sand to separate the mica from the machine-made sand, and then the separation operation is performed, which can process the machine-made sand and mica that are stuck together, thereby ensuring the efficiency of subsequent separation and further ensuring the accuracy of the test results;

[0089] In addition, the detection device has a simple structure, is easy to operate, has a low cost, and is suitable for industrial use.

[0090] In a preferred embodiment, the separation tank 1 includes an outer tank body 101 connected to the support frame 2, and an inner tank body 103 is disposed inside the outer tank body 101; a plurality of partitions 104 are disposed inside the outer tank body 101 to form a plurality of cavities, and the specific number of cavities is determined according to actual conditions;

[0091] The inner wall of the inner tank body 103 is provided with a plurality of grooves 105, and a plurality of groove holes 106 are provided in the grooves 105. The sizes of the groove holes 106 are determined according to the actual situation and can be the same or different.

[0092] A plurality of water inlet chambers 107 are formed between the outer tank body 101, the inner tank body 103 and the partition plate 104, and different water inlet chambers 107 are connected to different chambers through the groove pores 106 and the groove 105;

[0093] A connecting seat 102 is provided at the bottom of the outer tank body 101, and a water inlet mechanism 3 communicating with the water inlet cavity 107 is provided at the bottom of the connecting seat 102;

[0094] A plurality of sand discharge pipes 110 are provided at the bottom of the connection seat 102, and a plurality of sand discharge holes 111 are provided inside the connection seat 102, and the sand discharge holes 111 are connected to the sand discharge pipes 110; a control valve is provided inside the sand discharge pipe 110; the control valve can be an existing valve, preferably a gate valve;

[0095] A top cover 108 is provided on the top of the outer tank body 101, and a plurality of feed holes 109 are provided on the top cover 108; the partition plate 104 extends into the top cover 108;

[0096] The feed hole 109 is used to supply the machine-made sand discharged from the feed pipe 503 into the cavity;

[0097] A plurality of discharge holes 112 are provided in the top cover 108 , and the discharge holes 112 are used to discharge the mica.

[0098] During the detection process, the machine-made sand to be detected is divided into multiple portions, and then after being kneaded, it is put into different cavities through the feed hole 109, and then the outer tank body 101 is driven to rotate, so that the outer tank body 101, the connecting seat 102, the inner tank body 103 and the top cover 108 rotate as a whole, and the separation tank 1 keeps rotating at a high speed to generate a centrifugal force field. The mortar is thrown to the inner wall of the inner tank body 103 under the action of centrifugal force, and starts to fill the groove 105 from the bottom. When the amount of slurry in the groove 105 reaches the corresponding capacity, a fluidized bed begins to form; at the same time, water is introduced through the water inlet mechanism 3, and water enters the water inlet cavity 107, and then enters the groove 105 through the groove pores 106 to form backwash water, and finally enters the cavity. The machine-made sand particles and flaky mica particles move radially under the action of the backwash water to keep the fluidized bed loose.

[0099] Under the combined effect of centrifugal force and recoil water force, the machine-made sand particles can overcome the radial resistance of the recoil water and replace the position occupied by the mica particles in the fluidized bed through osmotic migration and remain in the groove 105; while the flaky mica particles are difficult to overcome the effect of the recoil water force due to the smaller centrifugal force they are subjected to, and flow out upward through the discharge hole 112 under the combined effect of the impact of the axial water flow and the axial component of the centrifugal force, thereby achieving the purpose of separating the machine-made sand particles from the flaky mica particles; after all the flaky mica particles in the chamber have flowed out, the separation tank 1 stops rotating while keeping the recoil water on, and then the control valve is opened, and the machine-made sand particles in the groove 105 are discharged through the sand discharge pipe 110.

[0100] The above process is simple to operate and has good separation effect, and is convenient for separating machine-made sand and mica.

[0101] Embodiment 2:

[0102] like Figure 1 , 2 As shown in , 3, 4, 6 and 7, the support frame 2 includes a first support ring 202 and a second support ring 203 sleeved on the outside of the separation tank 1, and the first support ring 202 and the second support ring 203 are provided with a plurality of support rods 201;

[0103] A bearing 207 is provided between the first support ring 202, the second support ring 203 and the separation tank 1;

[0104] The second support ring 203 is provided with a first motor 204, which is preferably a stepping motor or a servo motor and is controlled by the existing technology. A driving gear 205 is provided at the output end of the first motor 204, and the driving gear 205 is located inside the second support ring 203; a gear ring 206 is fixedly connected to the outer wall of the separation tank 1, and the gear ring 206 is meshed with the driving gear 205.

[0105] When in use, the first motor 204 is started to drive the driving gear 205 to rotate, thereby driving the gear ring 206 to rotate, and then driving the separation tank 1 to rotate, which is easy to operate.

[0106] In a further embodiment, a collecting tank 4 is provided at the top of the outer tank body 101. The collecting tank 4 is annular and is located below the discharge hole 112. A plurality of discharge pipes 401 are provided at the bottom of the collecting tank 4. The discharge pipes 401 are connected to a collecting device such as a box body, and the discharge pipes 401 are connected to the box body to collect mica. The specific size and position of the box body are determined according to actual conditions.

[0107] The collecting tank 4 is fixedly connected to the support rod 201 and rotatably connected to the outer tank body 101 ; the mica flowing out through the discharge hole 112 will fall into the collecting tank 4 and then be discharged and collected through the discharge pipe 401 .

[0108] Embodiment 3:

[0109] like Figure 1 , 2 , 3, 4 and 6, the water inlet mechanism 3 includes a water inlet sleeve 301 connected to the connecting seat 102, the water inlet sleeve 301 is provided with a connecting pipe 302, the connecting pipe 302 is provided with a liquid rotary joint 303, the liquid rotary joint 303 is provided with an external pipe 304, the external pipe 304 is provided with an electric rotary joint 305, and the external pipe 304 is connected to an external water source; the liquid rotary joint 303 and the electric rotary joint 305 can both adopt existing ones, and the liquid rotary joint 303 and the electric rotary joint 305 can ensure the rotation of the separation tank 1 without affecting the connection of the pipeline and the line;

[0110] A plurality of intermediate tubes 306 connected to the water inlet chamber 107 are provided in the connecting seat 102 . The intermediate tubes 306 are communicated with the water inlet sleeve 301 . The intermediate tubes 306 are provided with valves 307 and sensors. The valve 307 is preferably a solenoid valve. The sensor is a hydraulic sensor for detecting the hydraulic pressure in the water inlet chamber 107 .

[0111] When in use, water enters through the external pipe 304, and then enters the water inlet sleeve 301 through the liquid rotary joint 303 and the connecting pipe 302 in turn. Then, when water needs to be inlet, the valve 307 is opened, and the water can enter the water inlet chamber 107 through the intermediate pipe 306 and the valve 307 to meet the water inlet demand; the water inlet flow rate can be controlled by controlling the opening and closing size of the valve 307, and the hydraulic pressure is detected by the sensor.

[0112] In the above embodiment, the control valve, valve 307 and sensor are all connected to an external control unit via the electric rotary joint 305 , and the control unit can be any existing one, such as a PLC.

[0113] Embodiment 4:

[0114] like Figure 1 , 2 , 3 and 4, the kneading mechanism 6 includes a reducer 601 arranged on the side of the kneading cylinder 5, the reducer 601 is provided with a second motor 602, the second motor 602 is preferably a stepping motor or a servo motor, and is controlled in an existing manner, and the output shaft of the second motor is connected to the input end of the reducer 601;

[0115] A kneading roller 603 is provided in the kneading cylinder 5, and elastic shafts 604 are provided at both ends of the kneading roller 603;

[0116] One of the elastic shafts 604 is connected to the output end of the reducer 601;

[0117] When in use, start the second motor 602 to drive the elastic shaft 604 to rotate through the reducer 601, which can drive the kneading roller 603 to rotate, and the machine-made sand entering through the feed pipe 501 will fall to the bottom of the kneading roller 603 under the action of gravity. The rotation of the kneading roller 603 can knead the machine-made sand between the kneading roller 603 and the kneading cylinder 5, so that the mica stuck in the machine-made sand is separated from the machine-made sand, thereby facilitating subsequent separation and ensuring the accuracy of the detection results; the kneaded machine-made sand enters the feed hole 109 through the discharge pipe 502 and the feeding pipe 503.

[0118] Embodiment 5:

[0119] like Figure 8 As shown, a fixed plate 611 is provided in the kneading cylinder 5, and the kneading roller 603 is located on a side of the fixed plate 611 away from the feed pipe 501;

[0120] The elastic shaft 604 is connected to the output end of the reducer 601 via a rotating shaft 612;

[0121] The rotating shaft 612 is provided with a plurality of second kneading discs 614, and the kneading cylinder 5 is provided with a plurality of first kneading discs 613, and the first kneading discs 613 and the second kneading discs 614 are arranged alternately;

[0122] The first kneading plate 613 and the second kneading plate 614 are located below the feed pipe 501;

[0123] The first kneading plate 613 is rotatably connected to the rotating shaft 612 and is fixed to the kneading cylinder 5 .

[0124] When in use, start the second motor 602 to drive the rotating shaft 612 to rotate through the reducer 601, thereby driving the second kneading disk 614 and the elastic shaft 604 to rotate, and the elastic shaft 604 drives the kneading roller 603 to rotate. Relative rotation will occur between the second kneading disk 614 and the first kneading disk 613. Therefore, before the machine-made sand is kneaded by the kneading roller 603, the machine-made sand will be kneaded by the second kneading disk 614 and the first kneading disk 613 first, and then pass through the kneading roller 603. The separation effect is ensured by double kneading.

[0125] Embodiment 6:

[0126] like Fig.10 As shown, the kneading cylinder 5 includes a connected cylinder 511 and a square cylinder 512, and the connection between the cylinder 511 and the square cylinder 512 is smooth;

[0127] The feed pipe 501 is connected to the cylinder 511, and the discharge pipe 502 is connected to the square cylinder 512;

[0128] A support plate 631 is provided at the connection between the cylinder 511 and the square cylinder 512, and the kneading roller 603 is located inside the cylinder 511;

[0129] One of the elastic shafts 604 is connected to the output end of the reducer 601, and the other elastic shaft 604 is connected to the support plate 631;

[0130] The elastic shaft 604 is connected to a first bevel gear 632 , a connecting shaft 633 is provided in the square tube 512 , and the connecting shaft 633 is provided with a second bevel gear 634 meshing with the first bevel gear 632 ;

[0131] A plurality of movable shafts 635 are provided in the square tube 512, and the movable shafts 635 are connected to the connecting shaft 633 through a belt transmission mechanism 636;

[0132] The belt transmission mechanism 636 includes a driving wheel and a plurality of driven wheels. The driving wheel is connected to the connecting shaft 633, and the driven wheel is connected to the movable shaft 635. The driving wheel and the driven wheels are connected by belt transmission. Transmission teeth are provided at the connection between the driving wheel, the driven wheels and the belt.

[0133] A third kneading plate 637 is provided at the bottom of the movable shaft 635;

[0134] When in use, start the second motor 602 to drive the elastic shaft 604 to rotate through the reducer 601, which can drive the kneading roller 603 to rotate, thereby driving the first bevel gear 632 to rotate through another elastic shaft 604, and the first bevel gear 632 drives the second bevel gear 634 and the connecting shaft 633 to rotate, and then the movable shaft 635 can be driven to rotate through the belt transmission mechanism 636, and the movable shaft 635 can drive the third kneading disk 637 to rotate. The rotation of the third kneading disk 637 generates relative rotation with the square tube 512, and the passing machine-made sand can be kneaded. The machine-made sand is double-kneaded by the kneading roller 603 and the third kneading disk 637, thereby ensuring the separation effect.

[0135] A plug-in rod 638 is provided on the top of the third kneading disk 637. The plug-in rod 638 is a square rod. The plug-in rod 638 slides and extends to the inside of the movable shaft 635. The plug-in rod 638 and the movable shaft 635 can only be connected by sliding up and down. A limit block is provided on the top of the plug-in rod 638. A stabilizing spring 639 is provided on the top of the limit block. The stabilizing spring 639 always applies a downward force to ensure that the third kneading disk 637 has a kneading force on the machine-made sand, thereby ensuring the kneading effect.

[0136] In Examples 4, 5 and 6, the elastic shaft 604 is a shaft using an elastic coupling or an elastic bearing; by using the elastic shaft 604 to connect the rubbing roller 603, it can not only protect the reducer 601, but also allow the rubbing roller 603 to have a certain amount of room for movement, thereby adapting to different rubbing environments and ensuring the rubbing effect.

[0137] In Examples 4, 5 and 6, Fig. 9 As shown, the surface of the kneading roller 603 is also provided with a plurality of guide bars 621, and the guide bars 621 are inclined so that a portion of the machine-made sand can be scraped up during the rotation of the kneading roller 603. The machine-made sand rises for a certain distance and then falls down, which can increase the kneading and separation effect. In addition, the inclined guide bars 621 can play a certain guiding effect on the machine-made sand.

[0138] In the above embodiment, it is necessary to ensure that the kneading cylinder 5 is in an inclined state, and one end of the kneading cylinder 5 close to the feed pipe 501 is higher than the other end.

[0139] Embodiment 7:

[0140] First, the theoretical analysis of the separation process of machine-made sand and mica is as follows:

[0141] When the machine-made sand particles with a mass of m1 rotate with the slurry, the centrifugal inertia force P1 is: P1 = m1ω 2 r;

[0142] When the mica particles with a mass of m2 rotate with the slurry, the centrifugal inertia force P2 is: P2 = m2ω 2 r;

[0143] Where ω is the cone angular velocity in the tank, and r is the radial displacement of the particle from the rotation axis to the current position;

[0144] Machine-made sand is mostly spherical particles;

[0145] The formula for calculating the volume of a sphere is:

[0146] The centrifugal inertia force is

[0147] R is the radius of machine-made sand particles, V1 is the volume of machine-made sand particles, and ρ1 is the density of machine-made sand;

[0148] Mica is a flake structure, and its thickness is calculated as 0.1R;

[0149] The formula for calculating the volume of a sheet is:

[0150] The centrifugal inertia force is

[0151] R is the radius of the mica particle, V2 is the volume of the mica particle, and ρ2 is the density of mica;

[0152] The centrifugal inertia force of machine-made sand is

[0153] Centrifugal inertia force of mica

[0154] The machine-made sand particles and mica particles of the same particle size have the same initial radius of gyration and the same angular velocity;

[0155] Available,

[0156] Calculation of backwash water pressure: F 冲 =ps 有效 ;

[0157] Effective inertial centrifugal force F 离 =V(ρ s -ρ l )ω 2 r;

[0158] s 有效 is the effective area of ​​backwash water, ρ s is the density of the particle, ρ l is the density of the liquid;

[0159] Newton's second law of motion for a single particle: ma = F 离 -F 冲 ;

[0160] For the same particle size of machine-made sand particles and flaky mica particles, the F 离 >F 冲 , the machine-made sand particle bed migrates to the inner wall of the groove, and the F of the flaky mica particles 离 <F 冲 , ensuring that the flaky mica particles are blocked outside the groove and overflow the inner cone along with the fluidized bed;

[0161] The analysis of the upward movement of the flaky mica particles along the cone wall is as follows:

[0162] Centrifugal force along the cone

[0163] α is the angle between the inner cone and the horizontal plane;

[0164] Gravity component along the cone

[0165] g is the gravitational constant;

[0166] The main force is the buoyancy force in the gravitational field

[0167] The component of the kinetic friction acting on the particle

[0168] Cp is related to the porosity between particles, particle density, and particle diameter, and vz is the velocity of particles moving along the cone surface;

[0169] In the direction of movement of the flaky mica particles along the cone surface, the resultant force of the mica particles moving in the direction of the cone surface is:

[0170] The centrifugal inertia force on the machine-made sand particles is dozens of times that of the mica. By controlling the pressure of the backwash water, the machine-made sand particles can be kept in the groove, and the flaky mica particles overflow with the fluidized bed, thus achieving the separation of the machine-made sand particles and the flaky mica particles.

[0171] The present invention provides a method for detecting mica content in machine-made sand, and the specific steps are as follows:

[0172] S1. Take 500.00g of dry limestone machine-made sand sample, accurate to 0.01g, and screen out machine-made sand particles larger than 4.75mm and less than 0.3mm according to the mica content detection method in GB / T14684-2022 "Construction Sand" and weigh this part of the machine-made sand to obtain =101.60g, and screen the remaining 4.75-0.3mm machine-made sand particles according to 4.75mm-2.36mm, 2.36mm-1.18mm, 1.18mm-0.6mm, 0.6mm-0.3mm4 particle sizes into 4 parts;

[0173] S2, turn on the backwash water and knead the 4 parts of machine-made sand separately;

[0174] S3, the kneaded machine-made sand is fed into four chambers, the separation tank 1 rotates, and the machine-made sand and water are mixed into mortar;

[0175] S4, the tank body keeps rotating at a high speed to generate a centrifugal force field. The slurry fed is thrown toward the inner wall of the separation tank 1 (specifically, the inner wall of the inner tank body 103) under the action of the centrifugal force, and fills the groove 105 from the bottom. When the amount of slurry in the groove 105 reaches the corresponding capacity, a fluidized bed begins to form;

[0176] S5. The machine-made sand particles and the flaky mica particles move in the radial direction under the action of the backwash water, and the fluidized bed is kept in a loose state. Under the combined action of the centrifugal force and the backwash water force, the machine-made sand particles can overcome the radial resistance of the backwash water and replace the position occupied by the mica particles in the fluidized bed through osmotic migration and remain in the groove 105. However, the flaky mica particles are difficult to overcome the backwash water force due to the small centrifugal force, and flow out upward under the combined action of the axial water flow force and the axial component of the centrifugal force, thereby achieving the purpose of separating the machine-made sand particles from the flaky mica particles.

[0177] S6, after all the flaky mica particles in the four chambers have flowed out, the tank body stops rotating while the backwash water is kept on, and then the machine-made sand particles in the groove 105 are discharged;

[0178] S7. Filter the overflowed mica and place it in a drying oven at 95±5°C to dry to a constant weight. After cooling to room temperature, weigh m2=7.88g, and calculate the mica content p in the sand:

[0179]

[0180] Selection of limestone machine-made sand samples according to the mica content test in GB / T 14684-2022 "Construction Sand":

[0181] Take a dry limestone machine-made sand sample and reduce it to about 150.00g, accurate to 0.01g, and sieve out particles larger than 4.75mm and smaller than 0.3mm for later use;

[0182] Weigh 15.00g of the sample, accurate to 0.01g, and record it as m0. Pour the sample into a shallow dish and spread it out. Use a steel needle to pick out all the mica under a magnifying glass, and weigh the mica mass m, accurate to 0.01g;

[0183] Mica content in limestone machine-made sand:

[0184] The entire detection process does not require a large amount of manpower, ensuring detection efficiency, and the equipment is simple and low-cost, making it suitable for industrial use.

[0185] Embodiment 8:

[0186] A method for detecting mica content in machine-made sand is provided, and the specific steps are as follows:

[0187] S1. Take 500.00g of dry limestone machine-made sand sample, accurate to 0.01g, and screen out machine-made sand particles larger than 4.75mm and less than 0.3mm according to the mica content detection method in GB / T14684-2022 "Construction Sand" and weigh this part of the machine-made sand to obtain = 95.82g, and screen the remaining 4.75-0.3mm machine-made sand particles according to 4.75mm-3.35mm, 3.35mm-2.35mm, 2.35mm-1.20mm, 1.20mm-0.6mm, 0.6mm-0.3mm5 particle sizes into 5 parts;

[0188] S2, start the backwash water, rotate the tank, mix 5 parts of machine-made sand with water and feed them into the corresponding 5 chambers of the tank through the feeding pipe;

[0189] S3, the tank body keeps rotating at high speed to generate a centrifugal force field. The slurry fed is thrown toward the cone wall under the action of centrifugal force and fills the groove from the bottom of the tank body. When the amount of slurry in the groove reaches the corresponding capacity, a fluidized bed begins to form;

[0190] S4. The machine-made sand particles and the flaky mica particles move in the radial direction under the action of the backwash water, keeping the fluidized bed loose; under the combined action of the centrifugal force and the backwash water force, the machine-made sand particles can overcome the radial resistance of the backwash water and replace the position occupied by the mica particles in the fluidized bed through infiltration migration and remain in the groove; while the flaky mica particles are difficult to overcome the backwash water force due to the small centrifugal force, and flow out upward under the combined action of the axial water flow force and the axial component of the centrifugal force, thereby achieving the purpose of separating the machine-made sand particles from the flaky mica particles;

[0191] S5. After all the flaky mica particles in the four chambers have flowed out, the tank body stops rotating while the backwash water is kept on, and the sand discharge port at the bottom of the tank body is opened to discharge the machine-made sand particles in the groove;

[0192] S6. Filter the overflowed mica and place it in a drying oven at 95±3°C to dry to a constant weight. After cooling to room temperature, weigh m2=9.21g, and calculate the mica content p in the sand:

[0193]

[0194] Selection of limestone machine-made sand samples according to the mica content test in GB / T 14684-2022 "Construction Sand":

[0195] Take a dry granite machine-made sand sample and reduce it to about 150.00g, accurate to 0.01g, and sieve out particles larger than 4.75mm and smaller than 0.3mm for later use;

[0196] Weigh 15.00g of the sample, accurate to 0.01g, and record it as m0. Pour the sample into a shallow dish and spread it out. Use a steel needle to pick out all the mica under a magnifying glass, and weigh the mica mass m, accurate to 0.01g;

[0197] Mica content in granite machine-made sand:

[0198] In S1, four portions of machine-made sand were kneaded to separate the mica, making it easier for subsequent screening and testing.

[0199] The backwash water pressure of different cavities is controlled by valve 307, and a sensor is provided to detect the water pressure. In embodiments 7 and 8, the backwash water pressure is controlled by the opening and closing size of valve 307 to meet different separation requirements.

[0200] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A device for detecting mica content in machine-made sand, characterized in that: The invention comprises a separation tank (1), wherein the separation tank (1) is connected to a support frame (2); the separation tank (1) is used to separate mica from machine-made sand, and the support frame (2) is used to support and drive the separation tank (1) to rotate; A water inlet mechanism (3) is provided at the bottom end of the separation tank (1); A plurality of cavities are arranged in the separation tank (1), a plurality of kneading cylinders (5) are arranged on the top of the separation tank (1), the kneading cylinders (5) are provided with a discharge pipe (502) and a feed pipe (501), the discharge pipe (502) is provided with a feed pipe (503), and the feed pipes (503) of different separation tanks (1) are aligned with different cavities; A kneading mechanism (6) is arranged inside the kneading cylinder (5).

2. The device for detecting mica content in machine-made sand according to claim 1 is characterized in that: The separation tank (1) comprises an outer tank body (101) connected to a support frame (2), wherein an inner tank body (103) is arranged inside the outer tank body (101); a plurality of partitions (104) are arranged inside the outer tank body (101) to form a plurality of cavities; The inner wall of the inner tank body (103) is provided with a plurality of grooves (105), and a plurality of groove pores (106) are provided in the grooves (105); A plurality of water inlet chambers (107) are formed between the outer tank body (101), the inner tank body (103) and the partition plate (104), and different water inlet chambers (107) are connected to different chambers through the groove pores (106) and the grooves (105); A connecting seat (102) is provided at the bottom of the outer tank body (101), and a water inlet mechanism (3) communicating with the water inlet chamber (107) is provided at the bottom of the connecting seat (102); A plurality of sand discharge pipes (110) are provided at the bottom of the connection seat (102), a plurality of sand discharge holes (111) are provided inside the connection seat (102), and the sand discharge holes (111) are communicated with the sand discharge pipes (110); a control valve is provided inside the sand discharge pipes (110); A top cover (108) is provided on the top of the outer tank body (101), and a plurality of feed holes (109) are provided on the top cover (108); the partition plate (104) extends into the top cover (108); The feed hole (109) is used to supply the machine-made sand discharged from the feed pipe (503) into the cavity; A plurality of discharge holes (112) are arranged in the top cover (108), and the discharge holes (112) are used to discharge the mica.

3. The device for detecting mica content in machine-made sand according to claim 2 is characterized in that: The support frame (2) comprises a first support ring (202) and a second support ring (203) which are sleeved on the outside of the separation tank (1); the first support ring (202) and the second support ring (203) are provided with a plurality of support rods (201); A bearing (207) is provided between the first support ring (202), the second support ring (203) and the separation tank (1); The second support ring (203) is provided with a first motor (204), and an output end of the first motor (204) is provided with a driving gear (205), and the driving gear (205) is located inside the second support ring (203); and a gear ring (206) is fixedly connected to the outer wall of the separation tank (1), and the gear ring (206) is meshed with the driving gear (205).

4. The device for detecting mica content in machine-made sand according to claim 3 is characterized in that: A collecting groove (4) is provided at the top of the outer tank body (101); the collecting groove (4) is annular and is located below the discharge hole (112); a plurality of discharge pipes (401) are provided at the bottom of the collecting groove (4); The collecting tank (4) is fixedly connected to the support rod (201) and rotatably connected to the outer tank body (101).

5. The device for detecting mica content in machine-made sand according to claim 2 is characterized in that: The water inlet mechanism (3) comprises a water inlet sleeve (301) connected to the connection seat (102), the water inlet sleeve (301) is provided with a connection pipe (302), the connection pipe (302) is provided with a liquid rotary joint (303), the liquid rotary joint (303) is provided with an external pipe (304), and the external pipe (304) is provided with an electric rotary joint (305); A plurality of intermediate tubes (306) connected to the water inlet chamber (107) are arranged in the connection seat (102); the intermediate tubes (306) are in communication with the water inlet sleeve (301); the intermediate tubes (306) are provided with valves (307) and sensors, and the sensors are used to detect the hydraulic pressure in the water inlet chamber (107).

6. The device for detecting mica content in machine-made sand according to claim 1 is characterized in that: The kneading mechanism (6) comprises a reducer (601) arranged on the side of the kneading cylinder (5), the reducer (601) is provided with a second motor (602), and the output shaft of the second motor is connected to the input end of the reducer (601); A kneading roller (603) is provided in the kneading cylinder (5), and elastic shafts (604) are provided at both ends of the kneading roller (603); One of the elastic shafts (604) is connected to the output end of the reducer (601); The surface of the kneading roller (603) is provided with a plurality of guide bars (621), and the guide bars (621) are arranged obliquely.

7. The device for detecting mica content in machine-made sand according to claim 6 is characterized in that: A fixed plate (611) is provided inside the kneading cylinder (5), and the kneading roller (603) is located on a side of the fixed plate (611) away from the feed pipe (501); The elastic shaft (604) is connected to the output end of the reducer (601) via a rotating shaft (612); The rotating shaft (612) is provided with a plurality of second kneading discs (614), and the kneading cylinder (5) is provided with a plurality of first kneading discs (613), and the first kneading discs (613) and the second kneading discs (614) are arranged alternately; The first kneading plate (613) and the second kneading plate (614) are located below the feed pipe (501); The first kneading disc (613) is rotatably connected to the rotating shaft (612) and is fixed to the kneading cylinder (5).

8. The device for detecting mica content in machine-made sand according to claim 6 is characterized in that: The kneading cylinder (5) comprises a connected round cylinder (511) and a square cylinder (512); The feed pipe (501) is connected to the cylinder (511), and the discharge pipe (502) is connected to the square cylinder (512); A support plate (631) is provided at the connection between the cylinder (511) and the square cylinder (512), and the kneading roller (603) is located inside the cylinder (511); One of the elastic shafts (604) is connected to the output end of the reducer (601), and the other elastic shaft (604) is connected to the support plate (631); The elastic shaft (604) is connected to a first bevel gear (632), a connecting shaft (633) is provided in the square tube (512), and the connecting shaft (633) is provided with a second bevel gear (634) meshing with the first bevel gear (632); A plurality of movable shafts (635) are arranged in the square tube (512), and the movable shafts (635) are connected to the connecting shaft (633) by a belt transmission mechanism (636); A third kneading disk (637) is provided at the bottom of the movable shaft (635); A plug-in rod (638) is provided on the top of the third kneading disk (637), and the plug-in rod (638) slides and extends to the inside of the movable shaft (635). A limit block is provided on the top of the plug-in rod (638), and a stabilizing spring (639) is provided on the top of the limit block.

9. A method for detecting mica content in machine-made sand, characterized in that: The following steps are involved: S1, take M grams of dry machine-made sand sample, sieve out the machine-made sand particles larger than 4.75 mm and smaller than 0.3 mm, and then weigh to obtain m1; The remaining 4.75-0.3 mm machine-made sand particles are sieved into 3-6 portions from large to small particle sizes; S2, water inlet, forming backwash water in the separation tank (1); Knead 3-6 portions of machine-made sand separately; S3, the kneaded machine-made sand is fed into different chambers, the separation tank (1) rotates, and the machine-made sand is mixed with water to form mortar; S4, the separation tank (1) keeps rotating at a high speed to generate a centrifugal force field. The mortar is thrown toward the inner wall of the separation tank (1) under the action of the centrifugal force and fills the groove (105) from the bottom. When the amount of slurry in the groove (105) reaches a corresponding capacity, a fluidized bed begins to form; S5, machine-made sand particles and flaky mica particles move radially under the action of backwash water, keeping the fluidized bed in a loose state; Under the combined effect of centrifugal force and backwash water force, the machine-made sand particles can overcome the radial resistance of the backwash water and replace the position occupied by the mica particles in the fluidized bed through osmotic migration and remain in the groove (105); while the flaky mica particles are difficult to overcome the backwash water force due to the smaller centrifugal force, and flow upward under the combined effect of the axial water flow force and the axial component of the centrifugal force, thereby achieving the purpose of separating the machine-made sand particles from the flaky mica particles. S5, after all the flaky mica particles in the chamber have flowed out, the separation tank (1) stops rotating while the backwash water is kept on, and then the machine-made sand particles in the groove (105) are discharged; S6. Filter and dry the flaky mica particles, weigh them to get m2, and calculate the mica content p in the sand:

10. The method for detecting mica content in machine-made sand according to claim 9, characterized in that: In step S1, the particles are sieved into four portions according to four particle sizes: 4.75 mm to 2.36 mm, 2.36 mm to 1.18 mm, 1.18 mm to 0.6 mm, and 0.6 mm to 0.3 mm; The backwash water of different cavities is controlled by a valve (307) to control the backwash water pressure, and a sensor is provided to detect the water pressure.

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