A device for optimizing fine aggregate mixing based on low temperature negative pressure water flooding, multi-size sorting and temperature control

Abstract

The invention relates to the technical field of building aggregate processing, and discloses a device for optimizing fine aggregate mixing based on low-temperature negative pressure water driving with multiple particle sizes and temperature control. The batching system is used for storing building sand, and under the control of a control module, the building sand is distributed to a low-temperature dehumidification module through a first transmission module; the low-temperature dehumidification module is used for low-temperature drying of the building sand under the control of the control module, the screening module vibrates the building sand under the control of the control module until the screening operation is completed, and the screened building sand is distributed to a constant temperature discharging module through a third transmission module, and the building sand is heated to a constant temperature by the constant temperature discharging module with nitrogen as a heat exchange medium for storage; the invention can control the weighing of multi-graded building sand according to engineering requirements, mitigate the influence of seasonal temperature changes on the preparation of high-strength concrete raw materials, ensure the temperature consistency during the construction process, and improve the flexibility of construction.

Description

Technical Field

[0001] The invention relates to the technical field of building aggregate processing, in particular to a device for optimizing fine aggregate mixing based on low-temperature negative pressure water driving, multi-particle size sorting and temperature control. Background Art

[0002] In the construction industry, aggregates are the core components of building materials such as concrete, and the optimization of their gradation and performance is directly related to the quality and safety of the final building products. With the development of social economy, the demand for some high-strength and durable concrete has increased year by year, especially some ultra-high performance concrete materials are in short supply and the price is very high. The price of ordinary concrete is 300 yuan / cubic meter, and the price of ultra-high performance concrete is 3,000 yuan to 6,000 yuan / cubic meter. However, at present, the aggregate technology for such concrete materials is still mainly based on ordinary concrete processing methods, especially in the screening of fine aggregates, moisture treatment, and heating of aggregates under low temperature environments. There are a series of defects such as single heating technology, insufficient rationality of sorting, and single variability, which to some extent cause a series of defects such as differences in aggregate physicochemical properties. These problems not only affect the construction efficiency, but also have an adverse effect on the composition and performance of building materials. Especially in the winter construction of high-performance concrete, these problems become particularly prominent.

[0003] Under normal circumstances, in terms of fine aggregate screening and grading adjustment, traditional methods mainly rely on simple screening equipment, which has obvious limitations in screening efficiency, screening accuracy and grading adjustment. Due to the small size and complex shape of fine aggregate, it is difficult for traditional screening equipment to accurately screen and grade it. The aggregate grading may meet the requirements of the specification, but the range is large and the control precision is low, which cannot bring out the full performance of the aggregate for high-performance concrete. Traditional aggregate sorting methods often use a single screening device, which has obvious limitations when dealing with multi-size aggregates. Due to the wide distribution of aggregate particle sizes, a single screening device is difficult to achieve effective separation and combination of aggregates of different particle sizes, resulting in low sorting efficiency, and the aggregate grading after sorting often does not meet construction requirements. In addition, traditional sorting methods are particularly difficult when dealing with fine aggregates, because fine aggregate particles are small and complex in shape, and they are easy to clog the screen, further reducing sorting efficiency and accuracy.

[0004] Especially in the low temperature environment in winter, the moisture in fine aggregate is easy to freeze, which not only increases the difficulty of screening, but also greatly reduces the screening efficiency and quality. The traditional heating method is not uniform enough, and the aggregate temperature is not uniform, which more or less changes the physicochemical properties of the aggregate. This change has a low impact on the strength and cost of ordinary concrete and can be appropriately ignored. However, for high-performance concrete, this defect will reduce the concrete strength guarantee rate; secondly, in summer, the conventional practice is not to treat the moisture and temperature of the aggregate.

[0005] In summary, excessive aggregate moisture content and low temperature environment in winter construction bring great inconvenience and difficulties to high-performance concrete construction. The existing technology has obvious shortcomings in dealing with these problems, such as low efficiency of screening equipment, high energy consumption and poor effect of drying methods, cumbersome heating methods and easy thermal damage to aggregates. To this end, we have introduced a low-temperature negative pressure water-driven multi-particle size sorting and temperature-controlled fine aggregate mixing optimization device. Summary of the invention

[0006] The object of the present invention is to provide a device for optimizing fine aggregate mixing by multi-particle size sorting and temperature control based on low-temperature negative pressure water driving, so as to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A device for optimizing fine aggregate mixing based on low-temperature negative pressure water-driven multi-particle-size sorting and temperature-controlled, comprising a control module and a batching system controlled by the control module, a first conveying module, a low-temperature dehumidification module, a second conveying module, a screening module, a third conveying module and a constant-temperature discharging module, wherein the batching system is used to store building sand, and under the control of the control module, the building sand is distributed to the low-temperature dehumidification module through the first conveying module;

[0009] The low-temperature dehumidification module is used to dry the building sand at low temperature under the control of the control module, and distribute the low-temperature dried building sand to the screening module through the second conveying module;

[0010] The screening module vibrates the building sand under the control of the control module until the screening operation is completed, and distributes the screened building sand to the constant temperature discharging module through the third conveying module, and the building sand is heated to a constant temperature by the constant temperature discharging module for storage;

[0011] The low-temperature dehumidification module includes a sealed warehouse that can be opened and closed, a low-temperature dehumidification box for receiving building sand arranged inside the sealed warehouse, and a refrigerator and a vacuum pump fixed to the outer wall of the sealed warehouse. The inside of the sealed warehouse is cooled by a refrigerant circulation pipe connected to the refrigerator. When the temperature drops below the freezing point, the vacuum pump is started to evacuate the inside of the sealed warehouse to achieve low-temperature drying of the building sand in the low-temperature dehumidification box.

[0012] The screening module includes a plurality of screening boxes stacked and fixed up and down and arranged on a vibration mechanism and a scraping mechanism in the screening box. The vibration mechanism is used to vibrate the construction sand in the screening box, and the construction sand is screened step by step through the screen in the upper screening box, and then the scraping mechanism is used to discharge the construction sand to the third conveying module;

[0013] The constant temperature discharging module includes an air pump, a gas cylinder, several groups of constant temperature storage tanks, two groups of air-conducting hollow shells symmetrically arranged on the inner wall of the constant temperature storage tank, and several groups of air-conducting groove seats connected between the two groups of air-conducting hollow shells. The feed port at the top of the constant temperature storage tank is connected to the discharge port at the lower end of the horizontal part of the third conveying module by an openable and closable connecting component. The air pump is used to introduce the nitrogen in the gas cylinder into the air-conducting hollow shell. A heating pipe for heating nitrogen is provided in the air-conducting hollow shell. The heated nitrogen is introduced into the constant temperature storage tank via the air-conducting groove seat.

[0014] Preferably, the first conveying module and the second conveying module have the same structure, and the first conveying module includes a Z-shaped conveying shell and a conveying belt arranged inside the Z-shaped conveying shell;

[0015] A feed hopper is provided at the upper end of the horizontal portion below the Z-shaped conveying shell, and a discharge hopper is provided at the lower end of the horizontal portion above the Z-shaped conveying shell;

[0016] The third conveying module includes an L-shaped conveying shell and receiving hoppers evenly spaced from top to bottom on the outer side wall of the vertical portion of the L-shaped conveying shell. A conveyor belt is also provided inside the L-shaped conveying shell, and conveyor plates evenly spaced and fixed on the outer side surface of the conveyor belt.

[0017] Preferably, the batching system comprises a batching hopper, a first discharging stepper motor fixed at the bottom of the side of the batching hopper, and a first discharging screw shaft connected to the output end of the first discharging stepper motor;

[0018] The first discharging screw shaft is located in the discharging port at the bottom of the batching hopper, and a first discharging hopper is also fixed at the discharging port at the bottom of the batching hopper. The bottom of the first discharging hopper is located above the feeding hopper on the first conveying module.

[0019] Preferably, the sealed chamber comprises a first sealed shell and a second sealed shell, the first sealed shell is fixed on the slide seat, and the second sealed shell is slidably connected to the slide seat;

[0020] A directional slide rail and a slider are fixed to the side walls of the first sealing shell and the second sealing shell respectively, and the slider is slidably connected in the corresponding directional slide rail;

[0021] The first opening and closing motor and the first screw seat are also fixed at the upper and lower ends of the first sealing shell side wall, and the second screw seat is fixed at the upper and lower ends of the second sealing shell side wall. The output end of the first opening and closing motor is connected to a screw shaft, and the screw shaft passes through the first screw seat and is inserted into the second screw seat;

[0022] The discharge hopper on the first conveying module is located above the low-temperature dehumidification box.

[0023] Preferably, the plurality of groups of connecting columns on the side of the low-temperature dehumidification box are fixed to the inner wall of the first sealed shell, and the refrigerator and the vacuum pump are fixed to the outer wall of the low-temperature dehumidification box;

[0024] The air intake elbow of the vacuum pump air intake port extends into the first sealed shell, and the refrigerant liquid circulation pipe is located on the inner wall of the first sealed shell.

[0025] Preferably, a discharge motor is fixed to the side of the bottom of the low-temperature dehumidification box, and an auger connected to the output end of the discharge motor extends into the discharge port at the bottom of the low-temperature dehumidification box;

[0026] A plurality of groups of ventilation tubes are evenly distributed inside the low-temperature dehumidification box, both ends of the ventilation tubes penetrate through the low-temperature dehumidification box, and ventilation holes are evenly opened on the surfaces of the ventilation tubes.

[0027] Preferably, a screen lining lifting motor is fixed to the outer side wall of the upper screening box, and the output end of the screen lining lifting motor extends into the interior of the screening box and is connected to a screen lining, and the screen lining is located below the corresponding screen;

[0028] A bottom plate is provided at the bottom of the screening box below;

[0029] The scraping mechanism includes two sets of pushing spiral shafts symmetrically arranged on the inner wall of the screening box body and rubber scrapers connected between the two sets of pushing spiral shafts, and the pushing spiral shafts are driven by a pushing drive motor fixed on the outer wall of the screening box body;

[0030] A second discharging screw shaft is provided at one end of the interior of the screening box, and the second discharging screw shaft is driven by a second discharging stepping motor fixed to the outer side wall of the screening box;

[0031] A second discharge hopper is provided at the corner of the outer side wall of the screening box body, and the lower end of the second discharge hopper is located above the corresponding receiving hopper.

[0032] Preferably, the vibration mechanism includes a top plate fixed to the lower end of the bottom plate, a base fixed by springs at four corners of the lower end of the top plate, and a vibration motor fixed to the middle of the lower end of the top plate.

[0033] Preferably, the air guide hollow shell is evenly distributed with air nozzles, one end of the air nozzle extends into the air guide hollow shell, and the other end of the air nozzle extends into the inverted V-shaped groove at the lower end of the air guide groove seat;

[0034] A V-shaped material receiving plate is fixed at the bottom of the two groups of air-conducting hollow shells, a third material discharging screw shaft is arranged in the middle of the V-shaped material receiving plate, and the third material discharging screw shaft is driven by a third material discharging stepping motor fixed on the outer wall of the constant temperature storage tank;

[0035] Two groups of support seats are symmetrically fixed to the bottom side wall of the constant temperature storage tank, a weighing bucket is arranged between the two groups of support seats, and the top side of the weighing bucket is seated on the weighing sensor on the support seat;

[0036] An opening and closing leakage plate is provided at the bottom of the weighing bucket, and the opening and closing leakage plate is driven to rotate by an opening and closing leakage motor fixed to the side of the bottom of the weighing bucket;

[0037] The air outlet of the air pump is connected to a first gas circulation pipe through a three-way pipe, the other end of the first gas circulation pipe extends into the bottom of the corresponding air-conducting hollow shell, and the air inlet of the air pump is connected to a second gas circulation pipe, the other end of the second gas circulation pipe extends into the top of the corresponding air-conducting hollow shell;

[0038] The gas outlet of the gas cylinder is connected to the three-way pipe through a connecting pipe, and an electric valve is arranged on the connecting pipe, and the output of nitrogen is controlled by the electric valve.

[0039] Preferably, the openable and closable connection assembly includes a closed door mechanism fixed at the discharge port at the lower end of the horizontal portion of the third conveying module and a rubber bellows connected to the bottom of the closed door mechanism;

[0040] The closed door mechanism includes a sliding seat fixed on both sides of the discharge port at the lower end of the horizontal portion of the third conveying module, a sliding sealing plate slidably connected to the inside of the sliding seat, and a second opening and closing motor fixed to the top of the side edge of the sliding seat;

[0041] A driving gear is fixed at the output end of the second opening and closing motor, and a driven gear movably connected to a bracket is adopted at one end inside the sliding seat. The driving gear is meshed with the driven gear, and a driving spiral shaft fixed in the middle of the driven gear penetrates the bracket and is connected to the sliding sealing plate.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] (1) Aggregate low temperature negative pressure dehydration:

[0044] According to the winter temperature characteristics in the north, the present invention adopts low temperature treatment for aggregates to reduce energy consumption, and uses negative pressure to drive out moisture in the aggregates by using a vacuum pump in conjunction with a refrigerator, thereby achieving the goal of efficient drying while keeping the aggregate structure intact. Secondly, a multi-porous breathable mold (i.e., a breathable tube) is used to increase the specific surface area of ​​aggregate accumulation, thereby improving refrigeration efficiency and dehydration effect.

[0045] (2) Modular screening and fine grading adjustment:

[0046] The present invention sets up a multi-stage modular automatic screen, realizes aggregate screening under high-frequency vibration, uses screen lining and rubber scraper to realize continuous screening, uses multi-port feeding conveyor belt (i.e. the third conveying module) to realize multi-bin distribution of screened materials, and uses the weighing module (i.e. weighing sensor and weighing bucket) under the constant temperature discharging module to output high-quality graded sand. It can realize the screening detection of large-size aggregates and the optimization of grading control of the whole range of particle sizes.

[0047] (3) Aggregate nitrogen circulation heating:

[0048] The construction sand is treated by heating with circulating nitrogen, and the specific surface area of ​​aggregate accumulation is increased by utilizing the air guide trough. The heat circulation path is artificially constructed, and high-efficiency heating of the aggregate in a confined space can be achieved through staggered distribution. Nitrogen is used as the heat exchange medium to avoid the loss of activity of aggregates with highly active components and the condensation of moisture on the surface of the aggregate.

[0049] (4) Module integrated digital control:

[0050] The present invention realizes the fully automatic integration of drying, screening, heating and weighing of construction sand for high-strength concrete (C60 and above), reduces the burden of manpower, and realizes the coordinated cooperation of CNC low-temperature dehumidification module, screening module and constant temperature discharging module. It solves the problem of water-containing frost heave and temperature difference of construction sand in winter construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is a schematic diagram of the first three-dimensional structure of the present invention as a whole;

[0052] Figure 2 It is a second three-dimensional structural schematic diagram of the present invention as a whole;

[0053] Figure 3 A third three-dimensional structural schematic diagram of the present invention as a whole;

[0054] Figure 4 It is a schematic diagram of the three-dimensional structure of the batching system of the present invention;

[0055] Figure 5 It is a schematic diagram of the overall three-dimensional structure of the low-temperature dehumidification module of the present invention;

[0056] Figure 6 For the present invention Figure 5 Schematic diagram of the three-dimensional structure from another perspective;

[0057] Figure 7 It is a structural schematic diagram of the relative positions of the vacuum pump, refrigerator, refrigerant circulation pipe and low-temperature dehumidification box of the present invention;

[0058] Figure 8 It is a partial cross-sectional structural schematic diagram of the first transmission module of the present invention;

[0059] Fig. 9 It is a schematic diagram of the three-dimensional structure of the screening module of the present invention;

[0060] Fig.10 For the present invention Fig. 9 Schematic diagram of the three-dimensional structure from another perspective;

[0061] Fig.11 It is a schematic diagram of the overall three-dimensional structure of the screening module of the present invention;

[0062] Fig.12 A schematic diagram of the three-dimensional structure of the third conveying module and the constant temperature discharging module of the present invention;

[0063] Fig.13 For the present invention Fig.12 Schematic diagram of the three-dimensional structure from another perspective;

[0064] Fig.14 It is a three-dimensional structural schematic diagram of the closed door mechanism of the present invention;

[0065] Fig.15 It is a schematic diagram of the structure of the air-guiding hollow shell, the air-guiding groove seat, the V-shaped material receiving plate and the weighing bucket of the present invention;

[0066] Fig.16 It is a schematic diagram of the overall three-dimensional structure of the constant temperature storage tank of the present invention;

[0067] Fig.17 It is a schematic diagram of the three-dimensional structure of the V-shaped material receiving plate and the third material discharging spiral shaft of the present invention;

[0068] Fig.18 It is a schematic diagram of the three-dimensional structure of the support base, weighing bucket and opening and closing leakage plate of the present invention;

[0069] Fig.19 For the present invention Fig.18 Schematic diagram of the three-dimensional structure from another perspective;

[0070] Fig. 20 This is a schematic diagram of the three-dimensional structure of the connection between the heating tube and the air-conducting hollow shell of the present invention;

[0071] Fig.21 It is a schematic diagram of the three-dimensional structure of the air guide groove seat and the air nozzle arrangement of the present invention.

[0072] In the figure: 1. batching system; 101. batching hopper; 102. first discharging stepper motor; 103. first discharging screw shaft; 104. first discharging hopper; 2. first conveying module; 201. Z-shaped conveying shell; 202. conveying plate; 203. conveyor belt; 204. feed hopper; 205. discharge hopper; 3. low-temperature dehumidification module; 301. vacuum pump; 3011. air inlet elbow; 302. refrigerator; 303. air vent; 304. first sealed shell; 305. second sealed shell; 306. first opening and closing motor; 3061. first wire Rod seat; 3062, screw shaft; 3063, second screw seat; 307, slider; 308, low temperature dehumidification box; 309, discharge motor; 310, directional slide rail; 311, refrigeration liquid circulation pipe; 312, connecting column; 313, slide seat; 4, second transmission module; 5, screening module; 501, push drive motor; 502, screening box; 503, rubber scraper; 504, push screw shaft; 505, screen; 506, screen lining; 507, second discharge screw shaft; 508, bottom plate; 509, vibration motor; 510, Spring; 5101, base; 5102, top plate; 511, second discharging stepper motor; 512, screen lining lifting motor; 513, second discharging hopper; 6, third conveying module; 601, L-shaped conveying shell; 602, receiving hopper; 7, constant temperature discharging module; 701, closing door mechanism; 7011, sliding sealing plate; 7012, sliding seat; 7013, driving screw shaft; 7014, driven gear; 7015, driving gear; 7016, second opening and closing motor; 7017, bracket; 7018, rubber bellows; 702, Constant temperature storage tank; 703, air pump; 704, gas cylinder; 7041, electric valve; 7042, connecting pipeline; 705, second gas circulation pipe; 706, first gas circulation pipe; 707, V-shaped receiving plate; 708, supporting seat; 709, opening and closing leakage motor; 710, third discharging spiral shaft; 711, air guide groove seat; 7111, inverted V-shaped groove; 7112, air nozzle; 712, weighing bucket; 713, third discharging stepping motor; 714, opening and closing leakage plate; 715, air guide hollow shell; 716, heating tube; 8, control module. DETAILED DESCRIPTION

[0073] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0074] Example:

[0075] See also Figure 1-21, the present invention provides a technical solution:

[0076] A device for optimizing fine aggregate mixing based on low-temperature negative pressure water driving, multi-particle size sorting and temperature control, includes a control module 8 and a batching system 1 controlled by the control module 8, a first conveying module 2, a low-temperature dehumidification module 3, a second conveying module 4, a screening module 5, a third conveying module 6 and a constant temperature discharging module 7. Some necessary fixings and device casings in the drawings of the specification have been omitted for the convenience of display.

[0077] The number of modules of the main module can be adjusted according to actual needs. The aggregate in the invention is not limited to construction sand. The material body can be replaced according to actual specific requirements, and the size of the screen 505, the number of screen 505 layers and the modification of the output gradation can be changed accordingly.

[0078] The control module 8 includes a touch screen and a PLC controller integrated in the touch screen.

[0079] The first conveying module 2 and the second conveying module 4 have the same structure, and the overall size of the second conveying module 4 is higher than that of the first conveying module 2; and the first conveying module 2 includes a Z-shaped conveying shell 201 and a conveying belt 203 disposed inside the Z-shaped conveying shell 201;

[0080] A feed hopper 204 is provided at the upper end of the horizontal portion below the Z-shaped conveying housing 201, and a discharge hopper 205 is provided at the lower end of the horizontal portion above the Z-shaped conveying housing 201;

[0081] The third conveying module 6 includes an L-shaped conveying shell 601 and receiving hoppers 602 evenly spaced from top to bottom on the outer side wall of the vertical portion of the L-shaped conveying shell 601 . A conveyor belt 203 is also provided inside the L-shaped conveying shell 601 , and conveyor plates 202 are evenly spaced and fixed on the outer side surface of the conveyor belt 203 .

[0082] The third conveying module 6 is provided with feed ports A, B, C, and D on the outer side wall of the vertical portion from top to bottom, and a receiving hopper 602 is provided at each feed port A, B, C, and D, and the third conveying module 6 is provided with discharge ports a, b, c, and d in the horizontal direction, and an openable and closable connection component is connected to each discharge port a, b, c, and d;

[0083] The number of the feed inlets on the vertical part of the third conveying module 6 and the discharge outlets on the horizontal part of the third conveying module 6 is adjusted according to the number of the corresponding constant temperature storage tanks 702. During operation, only a single feed inlet on the vertical part of the third conveying module 6 is fed and only a single discharge outlet on the horizontal part of the third conveying module 6 is opened to discharge, and the conveyor belt 203 inside the third conveying module 6 is made to idle for one circle to complete the complete output of the remaining construction sand.

[0084] The bottom sides of the Z-shaped conveying housing 201 and the L-shaped conveying housing 601 are both equipped with conveying belt drive motors. Active rollers and driven rollers are also provided inside the two ends of the Z-shaped conveying housing 201 and the L-shaped conveying housing 601. The conveying belt 203 is connected between the active roller and the driven roller, and the output end of the conveying belt drive motor is connected to the active roller.

[0085] The conveyor belt drive motor adopts YVP series variable frequency asynchronous motor, YLKK series three-phase asynchronous motor for high-voltage conveyor belt, DCZ type conveyor belt motor or other motors that meet the use requirements.

[0086] The PLC controller controls the conveyor belt drive motor to work, so that the conveyor belt drive motor drives the conveyor belt 203 to rotate between the active roller and the driven roller. When the construction sand enters the Z-shaped conveying shell 201 or the L-shaped conveying shell 601, the conveying plate 202 on the conveyor belt 203 can transport the construction sand.

[0087] The batching system 1 is used to store building sand and distribute the building sand to the low-temperature dehumidification module 3 through the first conveying module 2 under the control of the control module 8;

[0088] The batching system 1 comprises a batching hopper 101, a first discharging stepper motor 102 fixed at the bottom of the side of the batching hopper 101, and a first discharging screw shaft 103 connected to the output end of the first discharging stepper motor 102;

[0089] The first discharge screw shaft 103 is located in the discharge port at the bottom of the batching hopper 101 , and a first discharge hopper 104 is also fixed at the discharge port at the bottom of the batching hopper 101 . The bottom of the first discharge hopper 104 is located above the feed hopper 204 on the first conveying module 2 .

[0090] The model of the first discharging stepper motor 102 is a 57 series three-phase stepper motor, an 86 series three-phase stepper motor or other stepper motors that meet the use requirements. The PLC controller controls the first discharging stepper motor 102 to work, so that the first discharging stepper motor 102 drives the first discharging screw shaft 103 to rotate, so that the construction sand in the batching hopper 101 is discharged to the first discharging hopper 104, and finally enters the Z-shaped conveying shell 201 of the first conveying module 2 through the first discharging hopper 104 and the feeding hopper 204;

[0091] As the PLC controller controls the conveyor belt drive motor on the first conveying module 2 to work, the conveying plate 202 on the conveyor belt 203 transports the construction sand until the construction sand falls into the low-temperature dehumidification box 308 through the discharge hopper 205 on the first conveying module 2 (at this time, the first sealing shell 304 and the second sealing shell 305 of the sealed bin need to be in the open state).

[0092] The low-temperature dehumidification module 3 is used to dry the building sand at low temperature under the control of the control module 8, and distribute the low-temperature dried building sand to the screening module 5 through the second conveying module 4;

[0093] The low-temperature dehumidification module 3 includes a sealed warehouse that can be opened and closed, a low-temperature dehumidification box 308 for receiving building sand arranged inside the sealed warehouse, and a refrigerator 302 and a vacuum pump 301 fixed to the outer wall of the sealed warehouse. The inside of the sealed warehouse is cooled by a refrigerant circulation pipe 311 connected to the refrigerator 302. When the temperature drops below the freezing point, the vacuum pump 301 is started to evacuate the inside of the sealed warehouse to achieve low-temperature drying of the building sand in the low-temperature dehumidification box 308.

[0094] The sealed chamber includes a first sealed shell 304 and a second sealed shell 305. The first sealed shell 304 is fixed on the slide seat 313, and the second sealed shell 305 is slidably connected to the slide seat 313.

[0095] The first opening and closing motor 306 and the first screw seat 3061 are also fixed to the upper and lower ends of the side wall of the first sealing shell 304, and the second screw seat 3063 is fixed to the upper and lower ends of the side wall of the second sealing shell 305. The output end of the first opening and closing motor 306 is connected to the screw shaft 3062, and the screw shaft 3062 passes through the first screw seat 3061 and is inserted into the second screw seat 3063;

[0096] A screw nut threadedly mounted on the screw shaft 3062 is provided in the second screw seat 3063, and a bearing mounted on the screw shaft 3062 is provided in the first screw seat 3061. In this way, when the first opening and closing motor 306 controls the screw shaft 3062 to rotate, the screw nut moves relative to the screw shaft 3062, thereby driving the second sealing shell 305 to move along the sliding seat 313.

[0097] The first opening and closing motor 306 adopts a Siemens servo motor (model 1FL6062-1AC61-2LH1 or 1FL6061-1AC61-2LA1), a Mitsubishi servo motor (model Mitsubishi HC-SFS202 or Mitsubishi HG-SN302BJ-S100) or other models that meet the use requirements;

[0098] The first opening and closing motor 306 is controlled by the PLC controller, so that the first opening and closing motor 306 drives the screw shaft 3062 to rotate forward or reverse, so that the second sealing shell 305 slides along the slide seat 313 to form a sealed sealed chamber after the second sealing shell 305 and the first sealing shell 304 are closed, or the second sealing shell 305 and the first sealing shell 304 are opened.

[0099] A directional slide rail 310 and a slider 307 are fixed on the side walls of the first sealing shell 304 and the second sealing shell 305, respectively, and the slider 307 is slidably connected to the corresponding directional slide rail 310; such a setting can ensure that the second sealing shell 305 slides along the slide seat 313, so as to achieve accurate docking and sealing of the second sealing shell 305 with the first sealing shell 304.

[0100] The discharge hopper 205 on the first conveying module 2 is located above the low-temperature dehumidification box 308. With this arrangement, when the first sealed shell 304 and the second sealed shell 305 are in the open state, the construction sand in the first conveying module 2 can accurately fall into the low-temperature dehumidification box 308 through the discharge hopper 205 on the first conveying module 2.

[0101] A plurality of groups of connecting columns 312 on the side of the low-temperature dehumidification box 308 are fixed to the inner wall of the first sealed shell 304, and the refrigerator 302 and the vacuum pump 301 are fixed to the outer wall of the low-temperature dehumidification box 308;

[0102] A discharge motor 309 is fixed to the side of the bottom of the low-temperature dehumidification box 308, and an auger connected to the output end of the discharge motor 309 extends into the discharge port at the bottom of the low-temperature dehumidification box 308;

[0103] The model of the refrigerator 302 is NHZ350L (SKJ300 EA-300) or QREA series: including multiple models such as QREA-1500, QREA-1200, QREA-1000, QREA-600, or RuiTaiKe PLC cabinet cooler: such as RTK-VTJ15 or other models that meet the use requirements;

[0104] The model of vacuum pump 301 is Asno vacuum pump unit, model: RA0040F, RA0063F, RA0100F negative pressure system or Jidina vacuum pump, model: 2BE203-OBY4 or other models that meet the use requirements;

[0105] The model of the unloading motor 309 is a 57 series three-phase stepper motor, an 86 series three-phase stepper motor or other stepper motors that meet the use requirements;

[0106] The refrigerant circulation pipe 311 is located on the inner wall of the first sealed shell 304 , and the air inlet elbow 3011 of the air inlet of the vacuum pump 301 extends into the first sealed shell 304 .

[0107] After the first sealed shell 304 and the second sealed shell 305 are closed to form a sealed chamber, the refrigerator 302 is controlled by the PLC controller to cool the inside of the sealed chamber through the refrigerant circulation pipe 311. When the temperature is about to reach below the freezing point (a temperature probe electrically connected to the PLC controller is also provided inside the sealed chamber. The temperature probe is used to detect the temperature inside the sealed chamber. The temperature probe adopts a thermocouple temperature probe, common models: K type, T type, E type, etc. or a thermal resistance temperature probe, common models: PT100, PT1000, etc. or an integrated temperature sensor probe, common models: such as LM35, DS18B20, etc. or other models that meet the use requirements), the PLC controller starts the vacuum pump 301 to perform vacuum treatment on the inside of the sealed chamber through the air inlet elbow 3011, so that negative pressure is formed in the low-temperature dehumidification box 308, and the moisture inside the construction sand in the low-temperature dehumidification box 308 is quickly sublimated under extremely low pressure to complete the drying of the aggregate.

[0108] After drying is completed, the PLC controller controls the first sealed shell 304 and the second sealed shell 305 to open, and then the PLC controller controls the discharge motor 309 to work, and the discharge motor 309 drives the auger to rotate, so as to discharge the construction sand into the feed hopper 204 of the second conveying module 4, so as to put the construction sand into the Z-shaped conveying shell 201 of the second conveying module 4.

[0109] Several groups of ventilation tubes 303 are evenly distributed inside the low-temperature dehumidification box 308. Both ends of the ventilation tubes 303 extend through the low-temperature dehumidification box 308, and ventilation holes are evenly opened on the surface of the ventilation tubes 303. The ventilation tubes 303 can improve the air permeability of the building sand in the low-temperature dehumidification box 308. After the refrigerator 302 cools the sealed bin, the low temperature in the sealed bin can be transferred to the building sand in the low-temperature dehumidification box 308 through the ventilation tubes 303, thereby improving the temperature exchange efficiency, so as to quickly cool the building sand in the low-temperature dehumidification box 308.

[0110] When the vacuum pump 301 performs vacuum treatment on the inside of the sealed chamber, the building sand in the low-temperature dehumidification box 308 can also be vacuumed through the air permeable pipe 303, and the moisture in the building sand can be extracted. The air permeable pipe 303 increases the specific surface area of ​​the aggregate (building sand, etc.) accumulation, and improves the refrigeration efficiency and dehydration effect.

[0111] The screening module 5 vibrates the building sand under the control of the control module 8 until the screening operation is completed, and distributes the screened building sand to the constant temperature discharging module 7 through the third conveying module 6, and the building sand is heated to a constant temperature by the constant temperature discharging module 7 for storage;

[0112] The screening module 5 includes a plurality of screening boxes 502 stacked and fixed on the vibrating mechanism and a scraping mechanism in the screening box 502. The vibrating mechanism is used to vibrate the building sand in the screening box 502, and the building sand is screened step by step through the screen 505 in the upper screening box 502, and then the scraping mechanism is used to discharge the building sand to the third conveying module 6;

[0113] A screen lining lifting motor 512 is fixed to the outer side wall of the upper screening box 502, and the output end of the screen lining lifting motor 512 extends into the screening box 502 and is connected to a screen lining 506, which is located below the corresponding screen 505;

[0114] The sieve slots on the sieve 505 gradually decrease from top to bottom, that is, the size of the sieve slots on the upper sieve 505 is larger than the size of the sieve slots on the lower sieve 505;

[0115] A bottom plate 508 is provided at the bottom of the screening box 502 below;

[0116] The scraping mechanism includes two sets of pushing screw shafts 504 symmetrically arranged on the inner wall of the screening box 502 and a rubber scraper 503 connected between the two sets of pushing screw shafts 504, and the pushing screw shafts 504 are driven by a pushing drive motor 501 fixed on the outer wall of the screening box 502;

[0117] The models of the screen lining lifting motor 512 and the material pushing driving motor 501 are 57 series three-phase stepping motors, 86 series three-phase stepping motors or other stepping motors that meet the use requirements;

[0118] A second discharging screw shaft 507 is provided at one end of the screening box 502, and the second discharging screw shaft 507 is driven by a second discharging stepping motor 511 fixed to the outer wall of the screening box 502;

[0119] The model of the second discharging stepper motor 511 is a 57 series three-phase stepper motor, an 86 series three-phase stepper motor or other stepper motors that meet the use requirements;

[0120] A second discharge hopper 513 is provided at the corner of the outer side wall of the screening box 502 , and the lower end of the second discharge hopper 513 is located above the corresponding receiving hopper 602 .

[0121] The vibration mechanism includes a top plate 5102 fixed to the lower end of the bottom plate 508 , a base 5101 fixed to the four corners of the lower end of the top plate 5102 by springs 510 , and a vibration motor 509 fixed to the middle of the lower end of the top plate 5102 .

[0122] The model of the vibration motor 509 is an XVM / XVMA series vibration motor, a YZS series vibration motor or other models that meet the use requirements.

[0123] The PLC controller controls the conveyor belt drive motor on the second conveying module 4 to work, so that the conveying plate 202 on the conveyor belt 203 transports the building sand until the building sand falls into the uppermost screening box 502 through the discharge hopper 205 on the second conveying module 4;

[0124] Then, the PLC controller controls the vibration motor 509 to work, so that the vibration motor 509 drives the screening box 502 to vibrate the building sand at high frequency, so that the upper and lower screens 505 screen the building sand step by step, that is, the particle size of the building sand on the upper screen 505 is larger than the particle size of the building sand on the lower screen 505, and the particle size of the building sand on the bottom plate 508 is the smallest;

[0125] When building sand of different particle sizes is needed, the PLC controller controls the corresponding pushing drive motor 501 to drive the pushing screw shaft 504 to rotate, so that the rubber scraper 503 pushes the building sand to the corresponding second discharging screw shaft 507 (before the rubber scraper 503 pushes the material, the PLC controller controls the corresponding screen lining lifting motor 512 to work, so as to adjust the screen lining 506 to a horizontal state, so as to block the lower end of the corresponding screen 505, thereby preventing the screen 505 from falling and preventing the building sand from falling off the screen 505);

[0126] Then, the PLC controller controls the corresponding second discharging stepper motor 511 to work, so that the second discharging screw shaft 507 works, and the building sand falls to the corresponding receiving hopper 602 through the second discharging hopper 513;

[0127] Finally, the conveyor belt driving motor on the third conveying module 6 is controlled by the PLC controller to work, so that the conveyor belt 203 on the third conveying module 6 conveys the building sand to the horizontal part of the upper end of the L-shaped conveying shell 601.

[0128] The constant temperature discharging module 7 includes an air pump 703, a gas cylinder 704, several groups of constant temperature storage tanks 702, two groups of air-guiding hollow shells 715 symmetrically arranged on the inner wall of the constant temperature storage tank 702, and several groups of air-guiding slot seats 711 connected between the two groups of air-guiding hollow shells 715. The top feed port of the constant temperature storage tank 702 is connected to the discharge port at the lower end of the horizontal part of the third conveying module 6 by an openable and closable connection component. The air pump 703 is used to introduce the nitrogen in the gas cylinder 704 into the air-guiding hollow shell 715. The air-guiding hollow shell 715 is provided with a heating pipe 716 for heating nitrogen. The heated nitrogen is introduced into the constant temperature storage tank 702 via the air-guiding slot seat 711. The constant temperature discharging module 7 uses nitrogen as a heat exchange medium to heat the building sand to a constant temperature and then stores it.

[0129] The PLC controller uses a power switch to connect with the heating tube 716. The heating tube 716 is an electric heating tube. The model of the power switch is Siemens 6EP1436 series power switch, MEAN WELL NDR, SDR series, Delixi CDQ3H B type, CDQ1s or other models that meet the use requirements.

[0130] The air pump 703 adopts Atlas Copco 365XHS series air pump, Siemens series air pump, Schneider series air pump or other air pumps that meet the use requirements.

[0131] The openable and closable connection assembly includes a closed door mechanism 701 fixed at the discharge port at the lower end of the horizontal portion of the third conveying module 6 and a rubber bellows 7018 connected to the bottom of the closed door mechanism 701;

[0132] The closed door mechanism 701 includes a sliding seat 7012 fixed to both sides of the discharge port at the lower end of the horizontal portion of the third conveying module 6, a sliding sealing plate 7011 slidably connected to the inside of the sliding seat 7012, and a second opening and closing motor 7016 fixed to the top of the side of the sliding seat 7012;

[0133] The second opening and closing motor 7016 adopts Siemens servo motor (model 1FL6062-1AC61-2LH1 or 1FL6061-1AC61-2LA1), Mitsubishi servo motor (model Mitsubishi HC-SFS202 or Mitsubishi HG-SN302BJ-S100) or other models that meet the use requirements;

[0134] A driving gear 7015 is fixed at the output end of the second opening and closing motor 7016, and a driven gear 7014 is movably connected to the bracket 7017 at one end of the sliding seat 7012. The driving gear 7015 is meshed with the driven gear 7014, and a driving spiral shaft 7013 fixed in the middle of the driven gear 7014 penetrates the bracket 7017 and is connected to the sliding sealing plate 7011.

[0135] After the construction sand is transported to the horizontal part at the upper end of the L-shaped conveying shell 601, the PLC controller controls the corresponding second opening and closing motor 7016 to work, so that the second opening and closing motor 7016 drives the sliding sealing plate 7011 to slide and open along the sliding seat 7012 through the driving gear 7015, the driven gear 7014 and the driving screw shaft 7013, so that the construction sand in the horizontal part of the L-shaped conveying shell 601 falls into the corresponding constant temperature storage tank 702 through the rubber bellows 7018, until the construction sand of different particle sizes is stored in the corresponding constant temperature storage tank 702 in sequence.

[0136] The air guide hollow shell 715 is evenly distributed with air nozzles 7112, one end of the air nozzles 7112 extends into the air guide hollow shell 715, and the other end of the air nozzles 7112 extends into the inverted V-shaped slot 7111 at the lower end of the air guide slot seat 711;

[0137] The air outlet of the air pump 703 is connected to the first gas circulation pipe 706 through a three-way pipe, and the other end of the first gas circulation pipe 706 extends into the bottom of the corresponding air-conducting hollow shell 715. The air inlet of the air pump 703 is connected to the second gas circulation pipe 705, and the other end of the second gas circulation pipe 705 extends into the top of the corresponding air-conducting hollow shell 715.

[0138] The gas outlet of the gas cylinder 704 is connected to the three-way pipe through a connecting pipe 7042, and an electric valve 7041 is provided on the connecting pipe 7042, and the electric valve 7041 controls the output of nitrogen.

[0139] The electric valve 7041 adopts the electric gate valve Z941W-25P DN600 produced by Shanghai Huquan Valve Co., Ltd., the electric butterfly valve WSD94F-10C DN500 produced by Jiangsu Quankai Drive Device Co., Ltd., the explosion-proof electric butterfly valve WSD943F-16C DN700 produced by Shanghai Gongyi Automatic Valve Co., Ltd. or other models that meet the use requirements.

[0140] In order to prevent air from entering the constant temperature storage tank 702 and possibly causing adverse effects on humidification of the construction sand in the constant temperature storage tank 702, or carbon dioxide or other gases mixed in the air may reduce the activity of the aggregate in the constant temperature storage tank 702, nitrogen is used as a heat exchange medium to heat the construction sand.

[0141] The PLC controller opens the electric valve 7041, so that the nitrogen in the gas cylinder 704 enters the three-way pipe through the connecting pipe 7042. At the same time, the air pump 703 works under the control of the PLC controller, so that the air pump 703 introduces the nitrogen entering the three-way pipe into the gas guide hollow shell 715 through the first gas circulation pipe 706, and leads it out through the second gas circulation pipe 705, so as to realize the circulation of nitrogen;

[0142] At the same time, the control power switch of the PLC controller is turned on, so that the heating tube 716 is energized. The heating tube 716 is used to heat the nitrogen in the air-conducting hollow shell 715. The heated nitrogen will enter the inverted V-shaped groove 7111 at the lower end of the air-conducting groove seat 711 through the air nozzle 7112, and finally heat the construction sand in the constant temperature storage tank 702. In order to avoid the loss of activity of aggregates with high active components and the condensation of moisture on the surface of the aggregates, nitrogen is used as the heat exchange medium.

[0143] The gas guide slots 711 are used to increase the stacking specific surface area of ​​aggregate (such as building sand), artificially construct a heat circulation path, and the gas guide slots 711 can also be staggered to achieve high-efficiency heating in the closed space of the aggregate;

[0144] A temperature probe is also provided in the constant temperature storage tank 702, and the temperature probe is used to detect the temperature in the constant temperature storage tank 702. When the temperature in the constant temperature storage tank 702 reaches a preset temperature, the PLC controller stops the introduction of nitrogen into the air guide hollow shell 715, and simultaneously stops the operation of the heating tube 716;

[0145] When the temperature in the constant temperature storage tank 702 is lower than the preset temperature, the PLC controller is used to start the introduction of nitrogen into the air guide hollow shell 715, and the heating tube 716 is started at the same time, so that the constant temperature storage tank 702 is kept in a constant temperature state.

[0146] A V-shaped material receiving plate 707 is fixed at the bottom of the two groups of air-conducting hollow shells 715, and a third material discharging screw shaft 710 is provided in the middle of the V-shaped material receiving plate 707. The third material discharging screw shaft 710 is driven by a third material discharging stepping motor 713 fixed to the outer wall of the constant temperature storage tank 702;

[0147] The model of the third discharging stepper motor 713 is a 57 series three-phase stepper motor, an 86 series three-phase stepper motor or other stepper motors that meet the use requirements;

[0148] Two sets of support seats 708 are symmetrically fixed to the bottom side wall of the constant temperature storage tank 702, and a weighing bucket 712 is arranged between the two sets of support seats 708, and the top side of the weighing bucket 712 is seated on the weighing sensor on the support seat 708;

[0149] The weighing sensor adopts Shanghai Keli: Model DCS-KL-C8, Siemens: SIWAREX series weighing sensor, Toledo (Mettler-Toledo): Model SLB415 or other models that meet the use requirements;

[0150] An opening and closing leakage plate 714 is provided at the bottom of the weighing bucket 712, and the opening and closing leakage plate 714 is driven to rotate by an opening and closing leakage motor 709 fixed to the side of the bottom of the weighing bucket 712;

[0151] The opening and closing leakage motor 709 adopts Siemens servo motor (model 1FL6062-1AC61-2LH1 or 1FL6061-1AC61-2LA1), Mitsubishi servo motor (model Mitsubishi HC-SFS202 or Mitsubishi HG-SN302BJ-S100) or other models that meet the use requirements;

[0152] The PLC controller controls the third discharging stepper motor 713 to work, so that the third discharging stepper motor 713 drives the third discharging screw shaft 710 to rotate, thereby conveying the construction sand above the interior of the constant temperature storage tank 702 to the weighing hopper 712;

[0153] At this time, the weighing sensor is used to weigh the weight of the construction sand in the weighing bucket 712, and then the PLC controller controls the opening and closing leakage motor 709 to work, so that the opening and closing leakage motor 709 drives the opening and closing leakage plate 714 to rotate to the position as shown in the figure. Fig.19 The state shown is used to control the output of weighed building sand.

[0154] In summary, the present invention is an integrated device for high-efficiency and low-energy dehydration technology for aggregates, fine processing of screening and grading adjustment, and nitrogen heating to protect the active components of aggregates. The weighing of multi-graded construction sand can be controlled according to engineering requirements, which reduces the impact of seasonal temperature changes on the raw materials for preparing high-strength concrete, ensures temperature consistency during construction, and improves construction flexibility.

[0155] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for optimizing fine aggregate mixing based on low-temperature negative pressure water-driven multi-size sorting and temperature-controlled, comprising a control module and a batching system controlled by the control module, a first conveying module, a low-temperature dehumidification module, a second conveying module, a screening module, a third conveying module and a constant temperature discharging module, characterized in that: The batching system is used to store building sand and distribute the building sand to the low-temperature dehumidification module through the first conveying module under the control of the control module; The low-temperature dehumidification module is used to dry the building sand at low temperature under the control of the control module, and distribute the low-temperature dried building sand to the screening module through the second conveying module; The screening module vibrates the building sand under the control of the control module until the screening operation is completed, and distributes the screened building sand to the constant temperature discharging module through the third conveying module, and the building sand is heated to a constant temperature by the constant temperature discharging module for storage; The low-temperature dehumidification module includes a sealed warehouse that can be opened and closed, a low-temperature dehumidification box for receiving building sand arranged inside the sealed warehouse, and a refrigerator and a vacuum pump fixed to the outer wall of the sealed warehouse. The inside of the sealed warehouse is cooled by a refrigerant circulation pipe connected to the refrigerator. When the temperature drops below the freezing point, the vacuum pump is started to evacuate the inside of the sealed warehouse to achieve low-temperature drying of the building sand in the low-temperature dehumidification box. The screening module includes a plurality of screening boxes stacked and fixed up and down and arranged on a vibration mechanism and a scraping mechanism in the screening box. The vibration mechanism is used to vibrate the construction sand in the screening box, and the construction sand is screened step by step through the screen in the upper screening box, and then the scraping mechanism is used to discharge the construction sand to the third conveying module; The constant temperature discharging module includes an air pump, a gas cylinder, several groups of constant temperature storage tanks, two groups of air-guiding hollow shells symmetrically arranged on the inner wall of the constant temperature storage tank, and several groups of air-guiding groove seats connected between the two groups of air-guiding hollow shells. The feed port at the top of the constant temperature storage tank is connected to the discharge port at the lower end of the horizontal part of the third conveying module by an openable and closable connection component. The air pump is used to introduce the nitrogen in the gas cylinder into the air-guiding hollow shell. A heating pipe for heating nitrogen is provided in the air-guiding hollow shell. The heated nitrogen is introduced into the constant temperature storage tank via the air-guiding groove seat. The air guide hollow shell is evenly distributed with air nozzles, one end of the air nozzles extends into the air guide hollow shell, and the other end of the air nozzles extends into the inverted V-shaped groove at the lower end of the air guide groove seat; A V-shaped material receiving plate is fixed at the bottom of the two groups of air-conducting hollow shells, a third material discharging screw shaft is arranged in the middle of the V-shaped material receiving plate, and the third material discharging screw shaft is driven by a third material discharging stepping motor fixed on the outer wall of the constant temperature storage tank; Two groups of support seats are symmetrically fixed to the bottom side wall of the constant temperature storage tank, a weighing bucket is arranged between the two groups of support seats, and the top side of the weighing bucket is seated on the weighing sensor on the support seat; An opening and closing leakage plate is provided at the bottom of the weighing bucket, and the opening and closing leakage plate is driven to rotate by an opening and closing leakage motor fixed to the side of the bottom of the weighing bucket; The air outlet of the air pump is connected to a first gas circulation pipe through a three-way pipe, the other end of the first gas circulation pipe extends into the bottom of the corresponding air-conducting hollow shell, and the air inlet of the air pump is connected to a second gas circulation pipe, the other end of the second gas circulation pipe extends into the top of the corresponding air-conducting hollow shell; The gas outlet of the gas cylinder is connected to the three-way pipe through a connecting pipe, and an electric valve is arranged on the connecting pipe, and the output of nitrogen is controlled by the electric valve.

2. The device for optimizing fine aggregate mixing based on low temperature negative pressure water flooding with multiple particle sizes and temperature control according to claim 1 is characterized in that: The first conveying module and the second conveying module have the same structure, and the first conveying module includes a Z-shaped conveying shell and a conveying belt arranged inside the Z-shaped conveying shell; A feed hopper is provided at the upper end of the horizontal portion below the Z-shaped conveying shell, and a discharge hopper is provided at the lower end of the horizontal portion above the Z-shaped conveying shell; The third conveying module includes an L-shaped conveying shell and receiving hoppers evenly spaced from top to bottom on the outer side wall of the vertical portion of the L-shaped conveying shell. A conveyor belt is also provided inside the L-shaped conveying shell, and conveyor plates evenly spaced and fixed on the outer side surface of the conveyor belt.

3. The device for optimizing fine aggregate mixing based on low temperature negative pressure water flooding with multiple particle sizes and temperature control according to claim 2 is characterized in that: The batching system comprises a batching hopper, a first discharging stepper motor fixed at the bottom of the side of the batching hopper, and a first discharging screw shaft connected to the output end of the first discharging stepper motor; The first discharging screw shaft is located in the discharging port at the bottom of the batching hopper, and a first discharging hopper is also fixed at the discharging port at the bottom of the batching hopper. The bottom of the first discharging hopper is located above the feeding hopper on the first conveying module.

4. The device for optimizing fine aggregate mixing based on low temperature negative pressure water flooding with multiple particle sizes and temperature control according to claim 2 is characterized in that: The sealed chamber comprises a first sealed shell and a second sealed shell, the first sealed shell is fixed on the sliding seat, and the second sealed shell is slidably connected to the sliding seat; A directional slide rail and a slider are fixed to the side walls of the first sealing shell and the second sealing shell respectively, and the slider is slidably connected in the corresponding directional slide rail; The first opening and closing motor and the first screw seat are also fixed at the upper and lower ends of the first sealing shell side wall, and the second screw seat is fixed at the upper and lower ends of the second sealing shell side wall. The output end of the first opening and closing motor is connected to a screw shaft, and the screw shaft passes through the first screw seat and is inserted into the second screw seat; The discharge hopper on the first conveying module is located above the low-temperature dehumidification box.

5. The device for optimizing fine aggregate mixing based on low temperature negative pressure water flooding with multiple particle sizes and temperature control according to claim 4 is characterized in that: A plurality of groups of connecting columns on the side of the low-temperature dehumidification box are fixed to the inner wall of the first sealed shell, and the refrigerator and the vacuum pump are fixed to the outer wall of the low-temperature dehumidification box; The air intake elbow of the vacuum pump air intake port extends into the first sealed shell, and the refrigerant liquid circulation pipe is located on the inner wall of the first sealed shell.

6. The device for optimizing fine aggregate mixing based on low-temperature negative pressure water flooding with multiple particle sizes and temperature control according to claim 4 is characterized in that: A discharge motor is fixed to the side of the bottom of the low-temperature dehumidification box, and an auger connected to the output end of the discharge motor extends into the discharge port at the bottom of the low-temperature dehumidification box; A plurality of groups of ventilation tubes are evenly distributed inside the low-temperature dehumidification box, both ends of the ventilation tubes penetrate through the low-temperature dehumidification box, and ventilation holes are evenly opened on the surfaces of the ventilation tubes.

7. The device for optimizing fine aggregate mixing based on low temperature negative pressure water flooding with multiple particle sizes and temperature control according to claim 2, characterized in that: A screen lining lifting motor is fixed to the outer side wall of the upper screening box, and the output end of the screen lining lifting motor extends into the screening box and is connected to a screen lining, which is located below the corresponding screen; A bottom plate is provided at the bottom of the screening box below; The scraping mechanism includes two sets of pushing spiral shafts symmetrically arranged on the inner wall of the screening box body and rubber scrapers connected between the two sets of pushing spiral shafts, and the pushing spiral shafts are driven by a pushing drive motor fixed on the outer wall of the screening box body; A second discharging screw shaft is provided at one end of the interior of the screening box, and the second discharging screw shaft is driven by a second discharging stepping motor fixed to the outer side wall of the screening box; A second discharge hopper is provided at the corner of the outer side wall of the screening box body, and the lower end of the second discharge hopper is located above the corresponding receiving hopper.

8. The device for optimizing fine aggregate mixing based on low temperature negative pressure water flooding with multiple particle sizes and temperature control according to claim 7 is characterized in that: The vibration mechanism comprises a top plate fixed at the lower end of the bottom plate, a base fixed at four corners of the lower end of the top plate by springs, and a vibration motor fixed at the middle of the lower end of the top plate.

9. The device for optimizing fine aggregate mixing based on low temperature negative pressure water flooding with multiple particle sizes and temperature control according to claim 1, characterized in that: The openable and closable connection assembly includes a closed door mechanism fixed at the discharge port at the lower end of the horizontal portion of the third conveying module and a rubber bellows connected to the bottom of the closed door mechanism; The closed door mechanism includes a sliding seat fixed on both sides of the discharge port at the lower end of the horizontal portion of the third conveying module, a sliding sealing plate slidably connected to the inside of the sliding seat, and a second opening and closing motor fixed to the top of the side edge of the sliding seat; A driving gear is fixed at the output end of the second opening and closing motor, and a driven gear movably connected to a bracket is adopted at one end inside the sliding seat. The driving gear is meshed with the driven gear, and a driving spiral shaft fixed in the middle of the driven gear penetrates the bracket and is connected to the sliding sealing plate.

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