CN113058847B

CN113058847B - Automatic screening and mixing system and method for anti-frost heaving filler of high-speed railway foundation

Info

Publication number: CN113058847B
Application number: CN202110441458.0A
Authority: CN
Inventors: 凌贤长; 王柯; 田爽; 唐亮; 闫穆涵; 李善珍
Original assignee: Harbin Institute of Technology
Current assignee: Harbin Institute of Technology
Priority date: 2021-04-23
Filing date: 2021-04-23
Publication date: 2022-02-22
Anticipated expiration: 2041-04-23
Also published as: CN113058847A

Abstract

The invention relates to an automatic screening and mixing system and method for frost heaving prevention filler of a high-speed railway foundation, which are provided with a particle screening module, a washing and drying module and a water injection mixing and discharging module; the particle screening module is formed by mutually coordinating a multifunctional particle screen with different particle sizes under the condition of meeting the design specification requirement of the roadbed in a cold region and a vibration control system; the washing and drying module comprises a multi-angle washing particle sieve aiming at large particle size, a multi-angle stirring device based on heat conduction material support and a mud water recycling and drying device which are mutually coordinated; the water injection mixing discharging module comprises a graded filler quality control device based on a miniature gravity sensor, an intelligent water spraying device and a multi-angle mixing device. The screening and configuration work of the roadbed filler in the cold region can be efficiently and scientifically finished, and the method has high practicability and accuracy.

Description

Automatic screening and mixing system and method for anti-frost heaving filler of high-speed railway foundation

Technical Field

The invention relates to the technical field of roadbed construction, in particular to an automatic screening and mixing system and method for frost heaving prevention filler of a high-speed railway foundation.

Background

The requirements for controlling the water content and the fine particle content of coarse-fine mixed fillers in the cold region rail transit roadbed engineering are extremely strict, and systematic research on the physical and mechanical properties of the anti-freezing and anti-swelling fillers of the cold region roadbed becomes an important subject which is paid more attention to by a plurality of scholars. The unit body test research of the anti-frost-heaving filler developed in a laboratory has a close relation between the reliability of the research result and the grain composition and the water content of the filler, so that how to scientifically and efficiently obtain the coarse-fine grain mixed filler under different soil water contents is particularly important for relevant research.

A unit body test aiming at roadbed fillers is developed in a laboratory, the prepared sample firstly needs to be screened to obtain soil bodies with preset particle grading, and the soil bodies with different grading are uniformly stirred according to certain water content. The currently used particle vibrating screen is simple in structural design, and soil in the particle vibrating screen is vertically vibrated and screened by the rotating spring in a single direction. Such screening devices have the following problems: 1, the surface of coarse particles contains a large amount of fine particles which cannot be screened out; 2 fine granular soil is not easy to sieve out; 3, the vibration frequency of the particle screening instrument can not be adjusted, the whole screening system is easy to generate resonance, and the service life of the instrument is shortened; 4, the fine granular soil is easy to be raised out of gaps of the granular sieve to cause filler waste; 5 the phenomena of uneven mixing of coarse-fine fillers and uneven mixing of soil and water are easily caused by manual stirring of the soil body.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides an automatic screening and mixing system and method for frost heaving prevention filler of a high-speed railway foundation, which can realize the rapid screening of coarse-fine particles of the road foundation filler, can accurately configure the water content and the fine particle content meeting the design requirements of the cold region road foundation filler by intelligent mixing, and can realize uniform mixing. Lays a foundation for scientifically and accurately researching the physical and mechanical properties of the roadbed filling in cold regions.

In order to achieve the aim, the invention provides an automatic screening and mixing system for anti-frost heaving filler of a high-speed railway foundation, which comprises a particle screening module, a washing and drying module and a water injection mixing and discharging module;

the particle screening module comprises a plurality of vibrating particle screens which are arranged from top to bottom according to the pore diameters from large to small, and the vibrating particle screens bear and screen the fillers in a vibrating manner;

the washing and drying module comprises a plurality of washing particle sieves which are arranged from top to bottom according to the pore diameters from large to small, and the washing and drying module bears, washes, stirs, dries and vibrates the fillers with the particle diameters larger than the threshold value after screening;

the water injection mixing discharging module injects filler according to the grading requirement; selecting fillers with set mass, calculating water injection amount according to configuration requirements, mixing the fillers with water according to the water injection amount, wherein the fillers injected by the water injection mixing discharging module are selected from the dried fillers, the fillers with the particle size not larger than a threshold value after vibration screening and/or the fillers obtained by other ways.

Further, the particle screening module comprises a mass analysis unit, a plurality of vibrating particle screens, a fine particle collection box, a plurality of vibrating loaders, a plurality of horizontal springs, a plurality of vertical springs and a vibration control unit;

the fine particle collecting box is positioned below the plurality of vibrating particle sieves;

each vibrating particle screen and the fine particle collecting box are connected to the side wall of the particle screening module, and each vibrating particle screen and the fine particle collecting box are connected with a corresponding vibrating loader through a horizontal spring; the fine particle collecting box is connected with the corresponding vibration loader through a plurality of vertical springs;

the vibration control unit controls each vibration loader to load vibration to the vibration particle screen and the fine particle collecting box according to a set vibration time sequence;

the mass analysis unit monitors the mass change of each vibrating particle screen and the fine particle collecting box, and finishes vibrating screening when the mass change rate is smaller than a set threshold value.

Further, the outer rings of the vibrating particle screen and the fine particle collecting box are provided with grooves and convex grooves to form threads which are matched and fixed with the threads on the side wall of the particle screening module; the vibrating particle sieve and the fine particle collecting box are embedded with conductive copper sheets, the size of the resistor changes along with the mass of the filler in the vibrating particle sieve, the mass of the filler in the vibrating particle sieve is detected, and when the mass change of the filler in the vibrating particle sieve in unit time is smaller than a set threshold value, the vibrating particle sieve is judged to be finished.

Furthermore, the washing and drying module comprises a multi-angle stirring device, a washing particle sieve, a high-temperature fan, a fine soil collecting bin, a fine particle filtering device and a purified water recycling bin;

the multi-angle stirring device is used for stirring the filler on each water washing particle sieve;

a plurality of washing nozzles with adjustable angles are arranged on the upper side of each washing particle sieve, and water is sprayed to wash the filler;

each washing particle sieve is provided with a plurality of air outlets, after stirring is completed, the high-temperature fan blows hot air to the filler through the air outlets, moisture evaporation is accelerated, and when the mass change of the filler in the washing particle sieve in unit time is smaller than a set threshold value, vibration screening is judged to be completed.

And the fine soil collecting bin is positioned at the lower part of the washing particle sieve, the muddy water containing the fine soil is collected, the filtered water flows into the purified water recovery bin to be recycled, and the fine soil of the mobile phone of the fine soil collecting bin is poured into the particle sieve with the corresponding particle size in the particle sieving module for continuous sieving.

Further, the multi-angle stirring device comprises a main stirring shaft, stirring blades, a stirring blade angle control wheel set, a soil cleaning blade and a multi-angle stirring device controller;

the main stirring shaft is horizontally arranged, the two driving ends of the main stirring shaft are connected with stirring blades to stir the filler, and each stirring blade is provided with a soil cleaning blade to remove the filler adhered to the surface; the multi-angle stirring device controller controls the adjustment of the inclination angle of the stirring blades and the setting of the stirring time.

Furthermore, the bottom of the fine-grained soil collection bin is provided with filter paper and permeable stones, the side wall of the fine-grained soil collection bin is provided with a high-temperature fan to blow out hot air, so that water evaporation is accelerated, the side wall of the fine-grained soil collection bin is provided with a suction unit to discharge water vapor, a temperature sensor monitors the temperature of the fine-grained soil collection bin, and the blowing rate of the high-temperature fan is adjusted based on the temperature. Furthermore, a miniature gravity sensor is arranged at the bottom of the fine-grained soil collection bin, and when the change rate of the detected gravity is smaller than a set threshold value, fine-grained soil drying is completed.

Further, the water injection mixing discharging module comprises an upper layer separation bin, a lower layer separation bin, a quality control unit, a multi-angle mixing bin, an intelligent water spraying device and a multi-angle mixing device;

the filler of the different particle diameters in the upper strata partition storehouse is discharged respectively to lower floor partition storehouse, and the ejection of compact quality that each particle diameter packed of quality control unit control reaches and sets for the quality after, and the upper strata partition storehouse stops the ejection of compact, and the storehouse is stirred to the multi-angle to the lower floor partition storehouse ejection of compact, and intelligence water jet equipment stirs the storehouse water spray to the multi-angle, and multi-angle stirring device stirs and packs, accomplishes and mixes.

The water injection mixing discharging module further comprises a discharging control device, the discharging control device controls discharging control switches of all particle size fillers at the bottom of the upper separation bin, and discharging angles theta and opening and closing states of parts, corresponding to all particle size filler discharging baffles, at the bottom of the upper separation bin are adjusted;

θ＝Δm/(nk)

wherein, the delta m is the difference value between the current mass and the preset mass of the filler with a certain grain diameter in the lower partition bin; n is an adjustment coefficient, when the grain size of the filler is larger than 5mm, n is 1.1, the grain size of the filler is smaller than 5mm, and n is 0.8; and k is a filler discharging speed parameter and is obtained based on the size of the filler particle size and the required filling speed calibration.

In another aspect, the method for screening and mixing the high-speed railway-based anti-frost heaving filler by using the automatic screening and mixing system for the high-speed railway-based anti-frost heaving filler comprises the following steps:

the filler is added from the upper part of the particle screening module, and the filler is screened in a vibrating way;

taking out the vibrating particle sieve layer by layer, pouring the filler with the particle size larger than a threshold value into the washing and drying module, and pouring the filler with the particle size not larger than the threshold value into the water injection mixing discharging module;

the washing and drying module washes and stirs the filler, and dries the filler after the stirring is finished;

and pouring the dried filler, the screened filler with the particle size not larger than the threshold and/or the filler obtained by other ways as raw materials into the water injection mixing discharging module, taking the raw materials with various particle sizes with set quality according to the grading requirement by the water injection mixing discharging module, calculating the water injection amount according to the grading requirement, and injecting water for mixing according to the water injection amount.

Further, the washing and drying module comprises a fine soil collecting bin, a fine particle filtering device and a purified water recycling bin;

and the fine soil collecting bin is positioned at the lower part of the washing particle sieve, and is used for collecting muddy water containing fine soil, and the filtered water flows into the purified water recovery bin for recycling.

The technical scheme of the invention has the following beneficial technical effects:

(1) according to the invention, the rapid screening of the coarse-fine particle filler is realized through the particle screening module, and the screening efficiency is improved by adopting a mode of vibrating the particle screen step by step according to the longitudinal cascade of the screened particle size;

(2) according to the washing and drying module, the filler is prevented from being wasted due to the lifting of fine-particle soil bodies in the screening process through water injection washing; residual fine particles on the surface of coarse-particle soil are eliminated, and the accuracy of research is greatly improved;

(3) according to the invention, the water injection mixing discharging module is used for realizing the rapid and uniform mixing of the coarse-fine particle mixed filler, so that a foundation is laid for the smooth development of an indoor test; the water spraying configuration soil sample is intelligently controlled based on a built-in computing module.

(4) According to the invention, the automation of screening and mixing is realized through the particle screening module, the washing and drying module and the water injection mixing and discharging module, the coarse-fine mixed filler suitable for the cold region rail transit roadbed is configured through a scientific flow, and the efficiency of researching the physical and mechanical properties of the cold region roadbed filler is greatly improved.

Drawings

FIG. 1 is a schematic diagram of a system and equipment principle for automatic screening and intelligent mixing of roadbed filling in cold regions;

FIG. 2 is a schematic view of a particle sorting module in one embodiment;

FIG. 3 is a schematic view of a rinsing and drying module in one embodiment;

FIG. 4 is a schematic diagram of a water injection blending discharge module in one embodiment;

FIG. 5 is a schematic illustration of a vibrating particle screen according to one embodiment;

FIG. 6 is a schematic view of a vibratory particle screen retaining groove in one embodiment;

FIG. 7 is a schematic diagram of the vibration control unit in one embodiment;

FIG. 8 is a diagram of a resistance pull control circuit;

FIG. 9 is a schematic diagram of an embodiment of a multi-angle water-washed particle screen;

FIG. 10 is a schematic view of a multi-angle mixing device;

FIG. 11 is a schematic structural view of a variable pressure water washing nozzle and a high temperature fan device;

FIG. 12 is a schematic view of the structure of the muddy water recovery bin;

FIG. 13 is a top view of a quality control unit in one embodiment;

wherein, 1 vibrating the particle sieve; 2 vibrating the top cover of the particle screen; 3, vibrating a particle sieve side wall interlayer, 3-1 vibrating a particle sieve outer wall, 3-2 interlayer inner and outer wall fixing screw holes and 3-3 connecting wire preformed holes; 4, connecting a wire with the particle screening system; 5, screening grooves by using particles; 6, screening convex grooves by using particles; 7 vibrating the particle screen; 8, a pull-sensitive resistor; the 9 micro gravity sensor sensing unit, the 9-1 micro gravity sensor, the 9-2 micro gravity sensor and the mass analysis module are connected with a lead; 10 mass analysis unit, 10-1 mass analysis module judgment screening continuing indicator light, 10-2 mass analysis module judgment screening termination indicator light, and 10-3 mass analysis module judgment program; the device comprises an 11Elite vibration control unit, an 11-1 horizontal vibration control system switch indicator lamp and an 11-2 horizontal vibration control system switch indicator lamp; 12 a fine particle collection box; 13 bidirectional vibration springs, 13-1 vibration springs and 13-2 rubber supports; 14 vibration loader, 14-1 vibrator connecting wire and 14-2 horizontal vibration loader; 15 washing the side wall of the particle sieve, 15-1 washing the outer wall of the particle sieve and 15-2 washing the inner wall of the particle sieve; 16 multi-angle stirring devices and 16-1 main stirring shafts; 16-2 stirring blade angle control wheel set, 16-3 stirring blade, 16-4 soil cleaning blade and 16-5 multi-angle stirring device controller; the 16-6 multi-angle stirring device is connected with a lead; 17 washing particle sieve, 17-1 variable pressure washing nozzle, 17-2 water replenishing port, 17-3 water delivery conduit and 17-4 variable pressure washing controller; 18 high-temperature fan, 18-1 air outlet, 18-2 air inlet pipeline and 18-3 drying high-temperature airflow pipe; 19 fine soil collection bins, 19-1 fine soil recovery layer side walls and 19-2 temperature sensors; 20. fine particle filtering device, 20-1 filter paper, 20-2 permeable stone; 21 a purified water recovery bin; 22 a catheter; 23. a suction unit; 24 upper-layer separation bins, 24-1 upper-layer separation bin interlayer outer walls, 24-2 upper-layer separation bin interlayer inner walls, 24-3 upper-layer separation bin discharge baffles, 24-4 type gravity sensors and mass analysis module connecting wires; 25 lower-layer separation bins, 25-1 lower-layer separation bin interlayer outer walls, 25-2 lower-layer separation bin interlayer inner walls and 25-3 lower-layer separation discharge baffles; 26 water injection nozzles; 27 intelligent water spraying device; 28 a quality control unit; 29 a partition plate; 30 multi-angle mixing bins; r1 constant resistance, R2 resistance.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

Fig. 1 shows a realization mode of a system suitable for automatic screening and intelligent mixing of cold region roadbed filler, mainly includes granule screening module, washes stoving module and water injection mix ejection of compact module. The three modules can work in parallel without mutual influence.

The particle screening module comprises a mass analysis unit 10, a number of vibrating particle screens 1, a fine particle collection box 12, a number of vibrating loaders 14, a number of bidirectional vibrating springs 13 and a vibration control unit 11.

Referring to fig. 2, first, vibrating particle sieves 1 with different particle sizes are sequentially connected from large to small according to the mesh size. As shown in fig. 5, the vibrating particle sieve 1 is provided with a groove 5 and a convex groove 6 which form a thread, the side wall 3 of the vibrating particle sieve is provided with a thread, each multifunctional particle sieve 1 is tightly connected by rotating the thread of the preset groove 5 and the convex groove 6, and the thread embedded conductive copper sheet 7 is in contact with the wire 4 of the side wall 3 of the vibrating particle sieve through the pull resistor 8, so that the circuit connection of a system is ensured. The tensile resistor 8 is annular and is connected with the outer ring of the conductive copper sheet 7. Referring to fig. 8, the resistance of.

The fine particle collecting box 12 is positioned below the plurality of vibrating particle sieves and collects fine particle soil bodies screened by the vibrating particle sieves, and the fine particle soil bodies are directly used for mixing.

Each vibrating particle screen 1 and the fine particle collecting box 12 are connected with a corresponding vibrating loader 14 through a horizontal spring 13-1; the fine particle collection box 12 is connected to a corresponding vibration loader 14 by a plurality of vertical springs. As shown in FIG. 7, the horizontal directional spring 13-1 is connected to the horizontal vibration loader at one end through a rubber mount 13-2 and connected to the vibrating particle screen outer wall 3-1 at the other end through a rubber mount 13-2 to transmit vibration. Similarly, the vertical directional spring has one end connected to the vertical vibration loader through a rubber mount and the other end connected to the fine particle collecting box 12 through a rubber mount, and drives each of the vibrating particle screen 1 and the fine particle collecting box 12 to vibrate longitudinally by transmitting longitudinal vibration to the fine particle collecting box. The fine particle collecting box 12 is used for collecting fine particle soil, and does not need vibration per se, but needs to transmit longitudinal vibration to the vibrating particle screen through the fine particle collecting box 12.

The vibration control unit 11 controls each vibration loader to load vibration to the vibrating particle sieve and the fine particle collecting box according to a set vibration timing.

Referring to fig. 2, roadbed filling is poured into a vibrating particle screen 1 through a feeding hole, and a top cover 2 is covered.

Referring to fig. 7, immediately starting the vibration control unit 11, firstly starting the horizontal vibration controller 11-1, starting the horizontal spring 13-1 to vibrate under the load action of the power loader 14-2, tightly connecting the rubber support 13-2 with the multifunctional granular sieve side wall 3-1 and the horizontal vibration spring 13-1, so that large granular soil bodies adhered together are initially separated, wherein the single vibration time is 2 minutes, then automatically starting the vertical vibration controller 11-2, and starting the vertical spring to work on fine screening of the filler under the same principle as the horizontal spring.

Referring to fig. 2, the micro gravity sensor sensing unit 9 includes a plurality of micro gravity sensors 9-1, as shown in fig. 7, disposed in the vibrating particle screen 1 and the fine particle collecting box 12, for detecting the weight of the collected soil mass. The micro gravity sensor sensing unit 9 collects the weight of soil in the multifunctional particle sieve 1 with each particle size during the vibration intermission period, the intermission time is 15 seconds, and the soil is fed back to the mass analysis unit 10 for judgment, when the change of the corresponding particle size mass is less than or equal to 2%, the mass analysis module indicator lamp 10-1 is on, the complete screening of the filler is considered to be completed, as shown in fig. 6, the vibration control unit 11 connected with the multifunctional particle sieve automatically controls the stop work, and the fine particle collecting box 12 collects fine particle soil with the particle size of less than 0.075 mm.

Referring to fig. 2 and 3, the top cover 2 is opened, soil bodies with the particle size larger than 5mm in the multifunctional particle sieve 1 are taken out layer by layer and poured into a multi-angle washing particle sieve (fig. 7) with the particle size corresponding to the washing and drying module fig. 3 for washing, and the top cover 25 of the multifunctional particle sieve is covered. Soil bodies with the particle size not larger than 5mm can be directly poured into the water injection mixing discharging module to be mixed.

The washing and drying module comprises a multi-angle stirring device 16, a washing particle sieve 17, a high-temperature fan 18, a fine soil collecting bin 19, a fine particle filtering device 30 and a purified water recycling bin 21.

The multi-angle stirring device 16 is used for stirring the filler on each water washing particle sieve 17. The multi-angle stirring device 16 comprises a main stirring shaft 16-1, stirring blades 16-3, a stirring blade angle control wheel set 16-2, a soil cleaning blade 16-4 and a multi-angle stirring device controller 16-5; the main stirring shaft 16-1 is horizontally arranged, the two driving ends are connected with stirring blades 16-3 for stirring the filler, and each stirring blade 16-3 is provided with a soil cleaning blade 16-4 for removing the filler adhered to the surface; the multi-angle stirring device controller 16-5 controls the adjustment of the inclination angle of the stirring blades and the setting of the stirring time, and the multi-angle stirring device controller is provided with an operation panel for setting the inclination angle and the stirring time.

A plurality of washing nozzles 17-1 with adjustable angles are arranged on the upper side of each washing particle sieve 17 to spray water to wash the filler. The water washing spray head 17-1 is connected with a water delivery conduit 17-3 through a water replenishing port 17-2, and the pressure and the angle of water outlet are adjusted by a variable pressure water washing controller.

Each water washing particle sieve 17 is provided with a plurality of air outlets 18-1, and the air outlets 18-1 are connected with an air inlet pipeline 18-2 and a drying high-temperature airflow pipe 18-3. After stirring, the high-temperature fan 18 blows hot air to the filler through the air outlet to accelerate water evaporation. Furthermore, the air outlets are arranged on the side wall of the particle sieve at intervals of 60 degrees. The angle of the air blowing can be adjusted, and the air is blown downwards from an oblique upper direction. The fine particle collecting bin is connected with the particle screen in a sealing way, so that fine soil can be prevented from being blown out. And judging that the drying is finished when the mass change of the soil in the sieve in unit time is less than 2%.

The fine soil collecting bin 19 is located below the water washing particle sieve 17 and is aligned vertically to collect muddy water containing fine soil, the filtered water flows into the clean water recovery bin to be recycled, and the fine soil is collected and poured into the particle sieve with the corresponding particle size (for example, 5mm) in the particle sieving module to be sieved continuously. The fine particle filter 20 attached with the filter paper 20-1 and the permeable stone 20-2 at the bottom of the fine particle recovery bin 19 can filter the muddy water in the fine particle recovery bin 19 through the filter paper 20-1 and the permeable stone 20-2, and the liquid water flows into the purified water recovery bin 21 through the conduit 22.

Referring to fig. 10, the multi-angle stirring device 16 is turned on, the stirring time is input on the multi-angle stirring device controller operation panel 16-5, the stirring time is 1.5 times of the washing time, when the filler is adhered to the stirring blade 16-3 of the multi-angle stirring device 16, the soil cleaning blade 16-4 automatically cleans the filler, and the soil cleaning blade 16-4 works according to the preset soil cleaning frequency without manual operation.

Referring to fig. 9 and 11, a variable pressure washing nozzle 17-1 of a multi-angle washing particle sieve 17 is opened while stirring to start water spraying and washing on the filler, the filler is stirred and washed according to the washing state of the soil particles, the variable pressure washing nozzle 17-1 can adjust the water outlet angle and the water outlet pressure through a variable pressure washing controller 17-4 according to the stirring state of the soil particles, the variable pressure washing nozzle 17-1 can rotate at 120 degrees, a water replenishing pipe 17-2 arranged in an interlayer 24-2 of a side wall of the multifunctional particle sieve continuously keeps the water supply state, the variable pressure washing nozzles 17-1 are connected through a water delivery pipe 17-3, the washing time of each time is determined according to the amount of the added filler, and the washing time is controlled by the variable pressure washing controller 17-4.

Referring to fig. 9, after the stirring is completed, the high temperature fan 18 is automatically turned on, and the high temperature fan 18 can continuously blow out hot air to accelerate the evaporation of the water on the surface of the coarse-grained soil.

Referring to fig. 12, while the above-mentioned washing process is performed, the fine-grained soil collection bin 19 of the mud-water recovery and drying device fig. 12 gradually collects mud water containing fine-grained soil, after the washing is finished, the high-temperature fan 23-1 designed on the side wall 19-1 of the fine-grained soil recovery layer is opened to continuously blow air to accelerate evaporation of liquid water in the mud water, and the temperature in the system is monitored by the temperature sensor 19-2 in real time, and data are collected and stored. Based on the measured temperature, the evaporation rate is scientifically adjusted. The temperature is low, the blowing rate is relatively increased, the temperature is high, and the blowing rate is relatively decreased. On the other hand, the temperature is prevented from being too high, and the safety effect of the device is protected.

Meanwhile, the quick suction unit 23 designed on the side wall 19-1 of the fine particle recovery bin in the muddy water recovery and drying device shown in figure 12 starts to work, aiming at discharging water vapor in the system, muddy water in the fine particle recovery bin 19 is filtered by the filter paper 20-1 and the permeable stone 20-2, liquid water flows into the clean water recovery bin 21 through the guide pipe 22, the miniature gravity sensor 9 is arranged on the bottom cloth of the fine particle recovery bin 19, and when the mass change of the bin is less than 5g in 20 minutes, the muddy water is judged to be completely dried into fine particle filler and is poured into the multifunctional particle sieve 1 with the particle size corresponding to the particle sieving module shown in figure 2.

The water injection mixing discharging module comprises an upper layer separation bin 24, a lower layer separation bin 25, a quality control unit 28, a multi-angle mixing bin 30, an intelligent water spraying device 27 and a multi-angle mixing device 16.

The filler ejection of compact to lower floor partition bin in the upper strata partition bin 24, quality control unit 28 control ejection of compact quality, reaches and sets for the quality after, and lower floor partition bin 25 ejection of compact is the storehouse 30 is stirred to the multi-angle, and intelligent water jet equipment 27 stirs the filler water spray in the storehouse 30 to the multi-angle, and multi-angle stirring device 16 stirs the filler, accomplishes and stirs.

And (3) opening the multi-angle washing particle sieve (figure 9) of the washing and drying module (figure 3), and pouring the washed and dried filler and the filler sieved by the particle sieving module (figure 2) into the separation bin 24 corresponding to each particle size of the quality control bin (figure 9) of the water injection stirring module (figure 3).

The designed quality control bin consists of separate bins with different particle size combinations; each separation bin is divided into an upper layer and a lower layer; the upper-layer separation chamber 24 forms a plurality of separation parts through separation plates 29, each separation part contains each grain diameter soil body, and a discharge control device is configured to control the quality of each grain diameter soil body in the upper-layer separation chamber; the bottom of the upper-layer separation bin 24 is provided with a discharge control switch, the discharge control switch controls the opening and closing state according to the soil mass quality fed back by the lower-layer separation bin 25, and the switch can control the opening angle of the discharge baffle 24-3 at the bottom of the upper-layer separation bin, namely the opening and closing state of the discharge baffle 24-3 at the bottom. The upper layer of the separation bin 24 can be separated into a plurality of parts through the discharge baffle 24-3, and each part can be controlled to be opened and closed independently and the discharge angle can be controlled.

In one embodiment, the discharging angle of each part of the discharging baffle 24-3 is adjusted according to the difference value Δ m between the instantaneous mass m1 of soil with a certain particle size in the lower partition chamber 25 and the preset mass m2, which is m2-m 1. When Δ m is equal to 0, the angle θ between the particle size fraction of the discharging baffle 24-3 and the horizontal direction is 0 ° and when Δ m is equal to m2, the angle θ between the particle size fraction of the discharging baffle 24-3 and the horizontal direction is 60 °, based on the previous experimental data, the functional relationship between Δ m and θ is established as follows:

Δm＝nkθ

and k is a filler discharging speed parameter, and is obtained by combining the particle size of the filler and calibrating according to the filling speed required by the filler with various particle sizes. And k is m 2/delta m, when the d is more than 5mm, n is 1.1, when the d is less than 5mm, n is 0.8, and the secondary function is input into the quality control unit to control the discharge.

When the device is used, the inclination angle theta is dynamically adjusted according to the difference delta m between the current mass and the preset mass of the filler with a certain particle size in the lower partition bin.

The lower-layer separation bin 25 is provided with a miniature gravity sensor 9 for testing the mass of soil bodies with different grain diameters entering the lower-layer separation bin 25, the quality control unit 28 for acquiring miniature gravity sensing data is connected with the discharge control switch of the upper-layer separation bin, when the mass of the soil body of the lower-layer storage bin reaches a preset value, the discharge baffle 24-3 of the upper-layer storage bin is rapidly closed, the discharge baffle 25-3 at the bottom of the lower-layer storage bin is opened after 2 seconds, and the soil body is poured into the multi-angle mixing bin 30. The stirring was started by the multi-angle stirring device 16. The discharging baffle plates 25-3 can be integrally arranged, and soil bodies in the separated bins are poured into the multi-angle mixing bins together.

Further, the layer separation bin 24 is provided with an upper layer separation bin interlayer outer wall 24-1 and an upper layer separation bin interlayer inner wall 24-2; the lower layer separation bin 25 is provided with a lower layer separation bin interlayer outer wall 25-1 and a lower layer separation bin interlayer inner wall 25-2; the design of the miniature gravity sensor 9 is consistent with that of the vibrating particle screen 1, and the soil mass quality is detected through the resistance value change of the resistance value of the resistance.

Furthermore, the upper and lower layer separation chambers are made of light metal materials. Each compartment holds soil bodies with different grain diameters.

The multi-angle mixing device 16 is started to uniformly mix the soil particles with different particle sizes, meanwhile, the water injection quality is calculated according to basic physical parameters such as preset water content, compaction degree and maximum dry density of the soil sample, the water is injected and mixed by the intelligent water injection device 27 in a fractional mode according to the total mass of the mixed soil body, the water injection nozzle 26 adopts an atomization treatment device to prevent water from being gathered on the surface of fine particles, and the water injection amount in the process is automatically controlled by an automatic spraying device.

(1) and adding the filler from the upper part of the particle screening module, and vibrating and screening the filler. Because the vibrating particle screen 1 is sequentially arranged according to the screen holes from large to small, the screening is carried out layer by layer, and each layer obtains the filler with different particle sizes.

(2) And taking out the vibrating particle sieve layer by layer, wherein the filler with the particle size larger than a threshold value (for example, 5mm) needs to be poured into the washing and drying module for further treatment, and the filler with the particle size not larger than the threshold value is poured into the water injection mixing discharging module. And (3) layering the filler in the vibrating particle sieve, and respectively pouring the filler into the water-washing particle sieves with corresponding particle sizes. Fillers smaller than a threshold particle size (e.g., less than 5mm) are not washed and are considered to have been screened. Rinsing is further processed primarily for cases where coarse particle surfaces having a particle size greater than a threshold value will have fine particles adhered to them.

(3) And the washing and drying module washes and stirs the filler, and dries the filler after the stirring is finished.

And further, collecting fine soil in a fine soil collecting bin, collecting muddy water containing the fine soil, and enabling the filtered water to flow into a purified water recovery bin for recycling.

(4) And pouring the dried filler, the screened filler with the particle size not larger than the threshold and/or the filler obtained by other ways as raw materials into the water injection mixing discharging module, taking the raw materials with various particle sizes with set quality according to the grading requirement by the water injection mixing discharging module, calculating the water injection amount according to the grading requirement, and injecting water for mixing according to the water injection amount.

And pouring fillers with various particle sizes into the corresponding partition parts of the upper-layer partition bin 24, wherein the quality required by grading is required to be met. And calculating the soil mass required by different particle sizes according to the required grading curve, and pouring the soil mass into the lower-layer separation bin 25. The lower-layer separation chamber 25 can weigh the mass of the added soil body, and after the grading quality requirement is met, the upper-layer separation chamber 24 is controlled to stop adding; and opening the lower-layer partition bin 24, adding all soil bodies of the lower-layer partition bin 24 into the multi-angle mixing bin, injecting water and mixing, wherein the quality of the injected water meets the grading requirement.

In conclusion, the invention relates to an automatic screening and mixing system and method for anti-frost heaving filler of a high-speed railway foundation, which is provided with a particle screening module, a washing and drying module and a water injection mixing and discharging module; the particle screening module is formed by mutually coordinating a multifunctional particle screen with different particle sizes under the condition of meeting the design specification requirement of the roadbed in a cold region and a vibration control system; the washing and drying module comprises a multi-angle washing particle sieve aiming at large particle size, a multi-angle stirring device based on heat conduction material support and a mud water recycling and drying device which are mutually coordinated; the water injection mixing discharging module comprises a graded filler quality control device based on a miniature gravity sensor, an intelligent water spraying device and a multi-angle mixing device. The screening and configuration work of the roadbed filler in the cold region can be efficiently and scientifically finished, and the method has high practicability and accuracy.

It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.

Claims

1. An automatic screening and mixing system for frost heaving prevention filler of a high-speed railway foundation is characterized by comprising a particle screening module, a washing and drying module and a water injection mixing and discharging module;

the water injection mixing discharging module injects filler according to the grading requirement; selecting fillers with set mass, calculating water injection amount according to configuration requirements, mixing the fillers with water according to the water injection amount, wherein the fillers injected by the water injection mixing discharging module are selected from the dried fillers, the fillers with the particle size not larger than a threshold value after vibration screening and/or the fillers obtained by other ways;

the particle screening module comprises a mass analysis unit, a plurality of vibrating particle screens, a fine particle collecting box, a plurality of vibrating loaders, a plurality of horizontal springs, a plurality of vertical springs and a vibration control unit;

the quality analysis unit monitors the quality change of each vibrating particle screen and the fine particle collecting box, and when the quality change rate is smaller than a set threshold value, the vibrating screen is finished;

the outer rings of the vibrating particle sieve and the fine particle collecting box are provided with grooves and convex grooves, and threads formed by the convex grooves are matched and fixed with threads on the side wall of the particle sieving module; the vibrating particle sieve and the fine particle collecting box are embedded with conductive copper sheets, the size of the resistor changes along with the mass of the filler in the vibrating particle sieve, the mass of the filler in the vibrating particle sieve is detected, and when the mass change of the filler in the vibrating particle sieve in unit time is smaller than a set threshold value, the vibrating particle sieve is judged to be finished.

2. The automatic screening and mixing system for the anti-frost heaving filler of the high-speed railway foundation is characterized in that the washing and drying module comprises a multi-angle stirring device, a washing particle sieve, a high-temperature fan, a fine soil collecting bin, a fine particle filtering device and a purified water recycling bin;

each washing particle sieve is provided with a plurality of air outlets, after stirring is completed, a high-temperature fan blows hot air to the filler through the air outlets, evaporation of water is accelerated, and when the mass change of the filler in the washing particle sieve in unit time is smaller than a set threshold value, vibration screening is judged to be completed;

3. The automatic screening and mixing system for the anti-frost heaving filler of the high-speed railway foundation as claimed in claim 2, wherein the multi-angle mixing device comprises a main mixing shaft, mixing blades, a mixing blade angle control wheel set, a soil cleaning blade and a multi-angle mixing device controller;

4. The automatic screening and mixing system for the anti-frost heaving filler of the high-speed railway foundation as claimed in claim 3, wherein the bottom of the fine soil collection bin is provided with filter paper and permeable stones, the side wall of the fine soil collection bin is provided with a high-temperature fan for blowing hot air to accelerate water evaporation, the side wall of the fine soil collection bin is provided with a suction unit for discharging water vapor, the temperature sensor monitors the temperature of the fine soil collection bin, and the blowing rate of the high-temperature fan is adjusted based on the temperature.

5. The automatic screening and mixing system for the anti-frost heaving filler of the high-speed railway foundation as claimed in claim 4, wherein a miniature gravity sensor is arranged at the bottom of the fine soil collection bin, and when the change rate of the detected gravity is smaller than a set threshold value, fine soil drying is completed.

6. The automatic screening and mixing system for the anti-frost heaving filler of the high-speed railway foundation according to claim 2, wherein the water injection mixing discharging module comprises an upper-layer separation bin, a lower-layer separation bin, a quality control unit, a multi-angle mixing bin, an intelligent water spraying device and a multi-angle mixing device;

7. The automatic screening and mixing system for the anti-frost heaving filler of the high-speed railway foundation as claimed in claim 6, wherein the water injection mixing discharging module further comprises a discharging control device, the discharging control device controls a discharging control switch of each particle size filler at the bottom of the upper separation bin, and adjusts a discharging angle theta and an opening and closing state of a corresponding part of each particle size filler discharging baffle at the bottom of the upper separation bin;

θ＝Δm/(nk)

8. A method for screening and mixing the high-speed railway-based anti-frost heaving filler automatic screening and mixing system according to any one of claims 1 to 7, wherein the method comprises the following steps:

9. The screening mixing method according to claim 8, wherein the washing and drying module comprises a fine soil collecting bin, a fine particle filtering device and a clean water recycling bin;