Cement clay slurry stirring device and method for goaf

Abstract

The invention discloses a cement clay slurry stirring device and method for a goaf, and the device comprises a multi-stage shear type stirring system, a dynamic ratio control system and a composite anti-sedimentation system. The dynamic proportioning control system comprises a weightlessness measuring bin, an immersion type online densimeter, a pneumatic butterfly valve, an electromagnetic flowmeter, a mass flowmeter, a tank body liquid level sensor and a PLC (Programmable Logic Controller) control system; the composite anti-sedimentation system comprises a pneumatic rotary spraying device, an ultrasonic vibrator and a mechanical scraper; the multi-stage shearing type stirring system comprises a first-stage stirring tank and a second-stage stirring tank which are connected in a sleeved mode, a first-stage stirring tank body and spiral first-stage stirring tank stirring blades of the first-stage stirring tank are driven by a motor to reversely rotate to rapidly crush clay blocks, and second-stage stirring tank stirring blades of the second-stage stirring tank are welded to the first-stage stirring tank body and driven to rotate; a composite anti-sedimentation system is matched to break particle aggregation and cement deposition, so that the uniformity of cement clay slurry is improved; and meanwhile, accurate proportioning of the materials is realized through a dynamic proportioning control system.

Description

Technical Field

[0001] The present invention belongs to the technical field of cement-clay mixing, and more particularly, relates to a cement-clay slurry mixing device and method for goaf areas. Background Art

[0002] While mineral mining provides strong support for national economic development, it also creates numerous goafs, which are potential sources of disasters. Surface collapses are common, posing a serious threat to the lives and property of residents in and around mining areas. This is particularly true for older iron ore mines, where data on their excavation is often missing due to differences in mining technology and management practices. Furthermore, goafs can also deform and damage over time, blurring their distribution and significantly increasing the difficulty of preventing and controlling surface collapses in these areas.

[0003] In the process of goaf treatment after mineral mining, grouting filling method (such as cement-based materials, paste filling, etc.) is usually adopted to form a stable structure by injecting mixed slurry into the goaf. The mixing tank is the core equipment for slurry preparation, and its mixing efficiency, slurry uniformity, and energy consumption control directly determine the treatment effect and project cost. In the prior art, such as the patent document with application number CN202021645758.8, the utility model provides a clay mud stirring device for mines, including a stirring cover, the upper end of the stirring cover is fixedly sleeved with a support floating ring, the support floating ring is provided with a stirring motor at the upper end, the power output shaft of the stirring motor passes through the support floating ring and is fixedly connected to the stirring shaft, a stirring auxiliary water pump is provided on the left side of the stirring motor, and an air pump is provided on the right side of the stirring motor. According to the clay mud stirring device for mines of the present invention, the viscosity of the mud can be reduced and the stirring resistance can be reduced by spraying water through the stirring auxiliary water pump; the stirring rod can break up the mud blocks to avoid blocking the mud pump; the air is injected into the mud by the air pump, which can further improve the stirring ability and reduce the stirring resistance; for example, the patent document with application number CN202321288815.5 provides a composite grouting device for combined cement-clay grouting, which includes a pipe body, and a parallel cement grouting channel and a clay grouting channel are provided inside the pipe body. The cement grouting The top of the channel and the top of the clay grouting channel are slurry inlets, and the top of the tube body is flush. The bottom of the cement grouting channel and the bottom of the clay grouting channel are both connected to a stirring device. The stirring device includes a stirring shaft, the lower end of which is welded to a stirring rod, the upper end of which passes through a fixed rod and is rotatably connected to the fixed rod, the top of the stirring shaft is connected to the output shaft of a motor, the motor is welded to the middle of the top of the fixed rod, and the motor is connected to a power supply device through a line pipe at the top. A slurry outlet is provided in the middle of the bottom of the stirring device, and the bottom of the slurry outlet is flush with the bottom of the tube body. The utility model has a simple structure, reduces the space occupied by the equipment, realizes a continuous production mode of slurry preparation and grouting, and has high grouting efficiency.

[0004] However, the devices in the prior art have problems such as low efficiency in crushing clay blocks, uneven mixing due to particle sedimentation, inaccurate raw material ratios, and inability to perform continuous production operations. Summary of the Invention

[0005] In response to the above defects or improvement needs of the prior art, the present invention provides a cement-clay slurry stirring device and method for goaf areas. Through a multi-stage shear stirring system, a dynamic proportioning control system and a composite anti-settling system, the clay block crushing efficiency, the cement-clay slurry stirring uniformity and the material proportioning accuracy are improved, thereby improving the engineering applicability of cement-clay filling slurry for goaf areas.

[0006] To achieve the above-mentioned purpose, according to one aspect of the present invention, a cement-clay slurry mixing device for goaf is provided, comprising: a multi-stage shearing mixing system, a dynamic proportioning control system and a composite anti-settling system, wherein:

[0007] The multi-stage shear mixing system includes a first-stage mixing tank, a second-stage mixing tank sleeved on the periphery of the first-stage mixing tank, and a slurry pump installed on the top of the tank body;

[0008] The first-stage stirring tank comprises a coaxial first-stage stirring tank body rotating shaft and a first-stage stirring tank stirring blade rotating shaft, one end of each of which is connected to the output shaft of the motor through a planetary gear, and the other end of the first-stage stirring tank body rotating shaft is welded with a tank top cover, and the tank top cover is clamped with the first-stage stirring tank body through a keyway;

[0009] The first-stage stirring tank has a stirring blade rotating shaft vertically welded with rods at equal intervals, and the ends of the rods are welded with spiral first-stage stirring blades; the second-stage stirring tank includes a second-stage stirring blade welded to the first-stage stirring tank body and a second-stage stirring tank body fixed to the ground;

[0010] The dynamic proportioning control system includes a weight loss metering bin installed on the top of the mixing tank, an immersed online density meter fixed to the inner wall of the first-stage mixing tank, a pneumatic butterfly valve and an electromagnetic flowmeter installed in series on the discharge pipeline of the first-stage mixing tank, a mass flowmeter installed on the feed pipeline of the second-stage mixing tank, a tank liquid level sensor installed on the side wall of the second-stage mixing tank, and a PLC control system;

[0011] The composite anti-sedimentation system includes a pneumatic rotary spraying device arranged at the bottom of the secondary stirring tank body and an ultrasonic vibrator symmetrically installed on the side wall of the secondary stirring tank body.

[0012] Furthermore, the rotating shaft of the first-stage stirring tank body is connected to the outer gear ring of the planetary gear, and the rotating shaft of the stirring blade of the first-stage stirring tank is connected to the planetary carrier of the planetary gear.

[0013] Furthermore, the inner side of the tank top cover is provided with an annularly distributed keyway, and the top edge of the first-stage mixing tank body is designed with key teeth matching the keyway of the tank top cover.

[0014] Furthermore, the tank top cover is also provided with holes for adding clay blocks and water.

[0015] Furthermore, the first-stage mixing tank also includes a tank top steel plate arranged on the tank top cover, on which the slurry pump and the motor are fixedly mounted.

[0016] Furthermore, the slurry pump is connected to the stirring tank of the first-stage stirring tank and the stirring tank of the second-stage stirring tank through pipelines.

[0017] Furthermore, the secondary mixing tank body is closed with a cover plate, and two holes are provided on the cover plate, one for feeding cement material, and the other is connected to the bottom end of the tank body through a pipe to install the pneumatic rotary spraying device.

[0018] Furthermore, a distance of 5 to 15 mm is maintained between the end of the stirring blade of the secondary stirring tank and the side wall and bottom of the tank body of the secondary stirring tank.

[0019] Furthermore, the composite anti-sedimentation system also includes a mechanical scraper installed at the end of the stirring blade of the secondary stirring tank.

[0020] According to another aspect of the present invention, a method for stirring cement-clay slurry for a goaf is provided, which is implemented using the above-mentioned cement-clay slurry stirring device for a goaf, and comprises the following steps:

[0021] S100: starting the motor to drive the rotating shaft of the stirring blade of the first stirring tank and the rotating shaft of the first stirring tank body to rotate in the opposite direction, adding clay and water from the tank top cover through the weightlessness metering chamber, and starting stirring. The forward rotation of the stirring blade of the first stirring tank and the reverse rotation of the first stirring tank body make the clay blocks contact the stirring blade of the first stirring tank more frequently, thereby making it easier to dissolve in water;

[0022] S200: During the clay slurry mixing process, the specific gravity of the clay slurry is monitored in real time by an immersed online density meter. When the detection value reaches a preset threshold, the PLC control system triggers the automatic operation, and the pneumatic butterfly valve and the slurry pump are automatically opened according to the control signal. The slurry is measured by the electromagnetic flow meter and then pumped into the secondary mixing tank by the slurry pump. The discharge volume is double-checked by the mass flow meter and the tank liquid level sensor. When the cumulative flow reaches the value required by the process or the liquid level rises to the preset safety height, the pneumatic butterfly valve executes the closing procedure, and the cement addition amount is controlled by the weight loss metering bin;

[0023] S300: The stirring blades of the secondary mixing tank are connected to the primary mixing tank body and are driven to rotate, breaking up the added cement ash and allowing it to fully dissolve in the clay slurry. At the same time, the ultrasonic vibrator vibrates at high frequency to prevent particle agglomeration. The pneumatic rotary spray device at the bottom blows the cement ash that has settled to the bottom, causing it to be pushed to other parts by the stirring blades of the secondary mixing tank and dissolved in the clay slurry again. After detecting that the specific gravity of the cement-clay slurry reaches a certain threshold, the slurry is pumped out;

[0024] S400: After the pumping is completed, steps S100 to S300 are repeated, and the clay slurry in the primary mixing tank is discharged into the secondary mixing tank again to form an automated circulation operation.

[0025] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0026] 1. The present invention relates to a cement-clay slurry mixing device for goaf areas. Driven by a motor, a multi-stage shearing mixing system drives the rotating shaft of the first-stage mixing tank's mixing blades and the rotating shaft of the first-stage mixing tank body to rotate via planetary gears. This causes the first-stage mixing tank body and the spiral first-stage mixing tank blades to move in opposite directions at differential speeds, forming a high-intensity turbulent shear field. This rapidly crushes clay particles under the multiple effects of collision, friction, and fluid shear, shortening the clay crushing time by 30%. Simultaneously, the second-stage mixing tank's mixing blades are driven to rotate by being connected to the first-stage mixing tank body. This, combined with the high-frequency vibration of an ultrasonic vibrator, a pneumatic rotary spraying device, and a mechanical scraper, eliminates particle agglomeration and cement deposition, achieving sufficient mixing and improving the uniformity of the cement-clay filling slurry.

[0027] 2. The cement-clay slurry mixing device for goaf areas of the present invention collects the feeding data of raw materials such as cement, clay, water, and admixtures in real time through a dynamic proportioning control system, and dynamically compensates for proportioning deviations through a PLC control system, thereby constructing a dynamic proportioning compensation system, solving the problem of slurry performance fluctuations caused by inaccurate manual weighing, and realizing precise control of the amount of raw materials such as cement, aggregate, water, and admixtures.

[0028] 3. The cement-clay slurry stirring device for goaf areas of the present invention uses an immersed online density meter to monitor the slurry specific gravity in real time. The PLC automatically adjusts the slurry pump speed and valve opening according to the detection values, so that the slurry concentration error is controlled to ≤0.5%. Combined with the dual calibration mechanism of the two-stage flow meter and the liquid level sensor, the measurement error of a single sensor is eliminated, ensuring a feeding accuracy of more than 98%. Compared with traditional manual experience adjustment, production efficiency is improved by 40% and raw material utilization rate is increased by 15%.

[0029] 4. The cement-clay slurry stirring device for goaf areas of the present invention uses multiple sheet-shaped secondary stirring tanks with mechanical scrapers at the ends of the stirring blades, and cooperates with the pneumatic rotary spraying device at the bottom of the tank to disturb the bottom sediment layer. At the same time, the ultrasonic vibrator is used to prevent particle agglomeration, thereby improving the suspension uniformity of solid particles by 90%, solving the problem of insufficient stirring during the solid particle stirring process and improving the stirring uniformity.

[0030] 5. The cement-clay slurry stirring device for goaf areas of the present invention adds clay, cement, water, etc. through the holes in the tank top cover and the sealing plate after precise weighing in the weightlessness metering bin. The clay is crushed and stirred in the first-stage stirring tank to form clay slurry. After the dynamic proportioning control system monitors and meets the requirements, the PLC control system triggers the automatic operation. The clay slurry is pumped from the first-stage stirring tank into the second-stage stirring tank by the slurry pump, and continuously stirred to form cement-clay slurry. After passing the test, the slurry is pumped out, forming an automated cycle operation, realizing continuous production operation, and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the three-dimensional structure of a cement-clay slurry stirring device for goaf according to an embodiment of the present invention;

[0032] Figure 2 This is a perspective structural diagram of a cement-clay slurry stirring device for goaf according to an embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of the main structure of a cement-clay slurry stirring device for goaf according to an embodiment of the present invention;

[0034] Figure 4 This is a left-side structural schematic diagram of a cement-clay slurry stirring device for goaf according to an embodiment of the present invention;

[0035] Figure 5 This is a schematic top view of a cement-clay slurry stirring device for use in goaf areas according to an embodiment of the present invention;

[0036] Figure 6 This is a flow chart of a method for mixing cement-clay slurry for goaf areas according to an embodiment of the present invention.

[0037] In all the drawings, the same figure marks represent the same technical features, specifically: 1-first-stage mixing tank, 101-first-stage mixing tank body, 102-first-stage mixing tank stirring blade, 103-first-stage mixing tank body rotating shaft, 104-first-stage mixing tank stirring blade rotating shaft, 105-motor, 106-tank top steel plate, 2-second-stage mixing tank, 201-second-stage mixing tank body, 202-second-stage mixing tank stirring blade, 3-slurry pump. DETAILED DESCRIPTION

[0038] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to illustrate the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0039] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0040] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0041] In the present invention, the terms "comprises," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0042] Example 1

[0043] like Figure 1-5 As shown, an embodiment of the present invention provides a cement-clay slurry mixing device for goaf areas, including a multi-stage shear mixing system, a dynamic proportioning control system and a composite anti-settling system. The multi-stage shear mixing system adopts a gradient crushing structure and a differential stirring design to fully stir the slurry. During the process, precise proportioning is achieved through weight loss measurement of the dynamic proportioning control system, online density monitoring and dual flow metering, and particle settlement is prevented through the composite anti-settling system, which significantly improves the uniformity, stability and engineering applicability of the filling slurry.

[0044] The multi-stage shearing mixing system includes a first-stage mixing tank 1, a second-stage mixing tank 2 and a slurry pump 3. The first-stage mixing tank 1 is truncated and sleeved in the second-stage mixing tank 2. The slurry pump 3 is installed on the top of the tank body. The first-stage mixing tank 1 includes a first-stage mixing tank body 101, a first-stage mixing tank stirring blade 102, a first-stage mixing tank body rotating shaft 103, a first-stage mixing tank stirring blade rotating shaft 104, a motor 105, a tank top steel plate 106 and a tank top cover. The first-stage mixing tank body rotating shaft 103 is coaxial with the first-stage mixing tank stirring blade rotating shaft 104, and the first-stage mixing tank body rotating shaft 103 is located on the periphery. The two are connected to the output shaft of the motor 105 through a planetary gear to achieve reverse rotation of the two; one end of the first-stage mixing tank body rotating shaft 103 is connected to the outer gear ring of the planetary gear, and the other end is welded to the tank top cover; one end of the first-stage mixing tank stirring blade rotating shaft 104 is connected to the planetary carrier of the planetary gear, and the other end extends to near the bottom of the first-stage mixing tank body 101;

[0045] The inner side of the tank top cover is provided with an annular keyway, and the top edge of the first-stage mixing tank body 101 is designed with key teeth that match the keyway of the tank top cover. The key teeth are embedded in the keyway for easy disassembly. The tank top cover is also provided with holes for adding clay blocks and water. The first-stage mixing tank body rotating shaft 103 is welded to the tank top cover, and the first-stage mixing tank body 101 is driven to rotate by the locking conduction force under the rotation of the motor 105;

[0046] Rods are welded vertically and evenly spaced along the shaft of the primary stirring tank stirring blade rotating shaft 104. The primary stirring tank body 101 is in the shape of a truncated cone. The length of the rod gradually becomes shorter from the bottom of the primary stirring tank body 101 upward, and the end connection line is parallel to the truncated cone generatrix; the primary stirring tank stirring blade 102 is welded to the end of the rod and is spirally distributed in the primary stirring tank body 101. The primary stirring tank stirring blade rotating shaft 104 rotates under the rotation of the motor 105, driving the rod and the primary stirring tank stirring blade 102 to rotate.

[0047] The motor 101 drives the primary agitator blade rotating shaft 104 and the primary agitator body rotating shaft 103 via planetary gears, causing the primary agitator body 102 and the spiral primary agitator blades 105 to rotate in reverse, breaking up the added clay lumps and allowing them to dissolve better in water, forming a clay slurry that meets the requirements. The tank top steel plate 106 is provided on the tank top cover and is used to house the motor 105 and the slurry pump 3.

[0048] The secondary mixing tank 2 includes a secondary mixing tank body 201 and secondary mixing tank stirring blades 202. The secondary mixing tank body 201 is fixed to the ground and closed with a cover plate. Two holes are provided on the cover plate, one for feeding cement material and the other for pressure ventilation through a pipe to the bottom of the tank body to prevent cement from sinking to the bottom. A plurality of secondary mixing tank stirring blades 202 are welded to the primary mixing tank body 101 through rods. The primary mixing tank body 101 is driven to rotate by a motor 105. The primary mixing tank body 101 itself rotates and drives the secondary mixing tank stirring blades 202 to rotate to stir the cement-clay slurry in the mixing tank of the secondary mixing tank body 201. The ends of the secondary mixing tank stirring blades 202 are kept 5 to 15 mm away from the side walls and bottom of the secondary mixing tank body 201 to facilitate the removal of sediment on the tank wall and bottom during rotation.

[0049] The slurry pump 3 is placed on the tank top steel plate 106 and is connected to the stirring tank of the first-level stirring tank 1 and the stirring tank of the second-level stirring tank 2 through a pipeline. The clay slurry is extracted from the stirring tank of the first-level stirring tank 1 and discharged into the stirring tank of the second-level stirring tank 2. The cement and clay slurry are evenly mixed under the rotation of the stirring blade 202 of the second-level stirring tank.

[0050] The dynamic proportioning control system includes a weight-loss metering bin, an immersed online density meter, an electromagnetic flowmeter, a pneumatic butterfly valve, an electromagnetic flowmeter, a mass flowmeter, a tank liquid level sensor, and a PLC control system. The weight-loss metering bin is installed on the top of the mixing tank to measure and add cement / clay dry materials in real time; the immersed online density meter is fixed to the upper middle part of the inner wall of the first-stage mixing tank body 102 to monitor the slurry specific gravity and feed it back to the PLC control system; the pneumatic butterfly valve and the electromagnetic flowmeter are installed in series on the mixing tank discharge pipeline of the first-stage mixing tank 1 to control the start and stop of the clay slurry transportation and the metering flow rate respectively; the mass flowmeter is installed on the mixing tank feed pipeline of the second-stage mixing tank 2, and a tank liquid level sensor is also installed on the side wall of the second-stage mixing tank body 201 to monitor the liquid level and prevent overflow. The PLC control system integrates and processes density, flow, and liquid level data, collects real-time feeding data of raw materials such as cement, clay, water, and admixtures, and dynamically adjusts the amount of clay and cement dry materials added and valve action. When the density meets the standard, the PLC control system triggers the pneumatic butterfly valve to open, and the slurry enters the secondary mixing tank after verification by the flow meter. When the liquid level or flow reaches the threshold, the pneumatic butterfly valve is closed.

[0051] The composite anti-sedimentation system includes a pneumatic rotary spraying device, an ultrasonic vibrator and a mechanical scraper. The pneumatic rotary spraying device is connected to the end of the pipe in one of the cover holes of the secondary mixing tank 2. The ultrasonic vibrator is symmetrically installed on the side wall of the secondary mixing tank body 201. The mechanical scraper is installed at the end of the mixing blade 202 of the secondary mixing tank, which is a polyurethane scraper.

[0052] Example 2

[0053] like Figure 6 As shown, based on the above device, an embodiment of the present invention provides a method for using a cement-clay slurry stirring device for goaf, comprising the following steps:

[0054] S100: starting the motor 105, driving the first-stage stirring tank stirring blade rotating shaft 104 and the first-stage stirring tank body rotating shaft 103 to rotate in opposite directions, adding clay and water from the tank top cover through the weightlessness metering chamber, and starting stirring. The forward rotation of the first-stage stirring tank stirring blade 102 and the reverse rotation of the first-stage stirring tank body 101 make the clay blocks contact the first-stage stirring tank stirring blade 102 more frequently, thereby making it easier to dissolve in water;

[0055] S200: During the clay slurry mixing process, the specific gravity of the clay slurry is monitored in real time by an immersed online density meter. When the detection value reaches a preset threshold, the PLC control system triggers the automatic operation, and the pneumatic butterfly valve and the slurry pump 3 are automatically opened according to the control signal. The slurry is measured by the electromagnetic flowmeter and then pumped into the secondary mixing tank 2 by the slurry pump 3. The discharge volume is double-checked by the mass flowmeter and the tank liquid level sensor. When the cumulative flow reaches the value required by the process or the liquid level rises to the preset safety height, the valve executes the closing procedure, and the cement addition amount is controlled by the weight loss metering bin;

[0056] S300: The stirring blade 202 of the secondary stirring tank is connected to the primary stirring tank body 101 and is driven to rotate, breaking up the added cement dust so that it is fully dissolved in the clay slurry. At the same time, the ultrasonic vibrator vibrates at high frequency to prevent the particles from agglomerating. The pneumatic rotary spraying device at the bottom can blow the cement dust that has settled to the bottom, so that it is pushed to other parts by the stirring blade 202 of the secondary stirring tank again to dissolve in the clay slurry. After detecting that the specific gravity of the cement-clay slurry reaches a certain threshold, the slurry is pumped out.

[0057] S400: After the pumping is completed, steps S100 to S300 are repeated, and the clay slurry in the primary mixing tank 1 is discharged into the secondary mixing tank 2 again to form an automatic circulation operation.

[0058] In the above embodiments, through the deep integration of the multi-stage shear mixing system structure device and intelligent control technology, the overall improvement of cement clay slurry preparation efficiency, proportioning accuracy and stability is achieved, and the applicability of slurry engineering is improved, especially for working conditions with strict requirements on material performance in goaf grouting engineering.

[0059] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A cement clay slurry stirring device for goaf, characterized in that: include: Multi-stage shear mixing system, dynamic proportioning control system and composite anti-sedimentation system, among which, The multi-stage shearing stirring system comprises a primary stirring tank (1), a secondary stirring tank (2) sleeved on the periphery of the primary stirring tank (1), and a slurry pump (3) installed on the top of the tank body; The first-stage stirring tank (1) comprises a coaxial first-stage stirring tank body rotating shaft (103) and a first-stage stirring tank stirring blade rotating shaft (104), one end of each of which is connected to the output shaft of a motor (105) via a planetary gear, and a tank top cover is welded to the other end of the first-stage stirring tank body rotating shaft (103), and the tank top cover is clamped to the first-stage stirring tank body (101) via a keyway; The primary stirring tank stirring blade rotating shaft (104) is vertically welded with rods at equal intervals, and the ends of the rods are welded with spiral primary stirring tank stirring blades (102); the secondary stirring tank (2) comprises secondary stirring tank stirring blades (202) welded to the primary stirring tank body (101) and a secondary stirring tank body (201) fixed to the ground; The dynamic proportioning control system comprises a weight loss metering bin installed on the top of the mixing tank, an immersed online density meter fixed on the inner wall of the first-stage mixing tank body (102), a pneumatic butterfly valve and an electromagnetic flowmeter installed in series on the discharge pipeline of the first-stage mixing tank (1), a mass flowmeter installed on the feed pipeline of the second-stage mixing tank (2), a tank body liquid level sensor installed on the side wall of the second-stage mixing tank body (201), and a PLC control system; The composite anti-sedimentation system comprises a pneumatic rotary spraying device arranged at the bottom of the secondary stirring tank body (201) and an ultrasonic vibrator symmetrically installed on the side wall of the secondary stirring tank body (201).

2. The cement-clay slurry stirring device for goaf according to claim 1, characterized in that: The first-stage stirring tank body rotation shaft (103) is connected to the outer gear ring of the planetary gear, and the first-stage stirring tank stirring blade rotation shaft (104) is connected to the planetary frame of the planetary gear.

3. The cement-clay slurry stirring device for goaf according to claim 2, characterized in that: The inner side of the tank top cover is provided with an annularly distributed keyway, and the top edge of the first-stage stirring tank body (101) is designed with key teeth matching the keyway of the tank top cover.

4. The cement-clay slurry stirring device for goaf according to claim 3, characterized in that: The top cover of the jar is also provided with holes for adding clay blocks and water.

5. The cement-clay slurry stirring device for goaf according to claim 4, characterized in that: The first-stage stirring tank (1) further comprises a tank top steel plate (106) arranged on the tank top cover, on which the slurry pump (3) and the motor (105) are fixedly mounted.

6. The cement-clay slurry stirring device for goaf according to claim 5, characterized in that: The slurry pump (3) is connected to the stirring tank of the first-stage stirring tank 1 and the stirring tank of the second-stage stirring tank 2 through pipelines.

7. A cement-clay slurry stirring device for goaf according to any one of claims 1 to 6, characterized in that: The secondary mixing tank body (201) is closed with a cover plate, and two holes are provided on the cover plate, one for feeding cement material, and the other is connected to the bottom end of the tank body through a pipe to install the pneumatic rotary spraying device.

8. The cement-clay slurry stirring device for goaf according to claim 7, characterized in that: A distance of 5 to 15 mm is maintained between the end of the stirring blade (202) of the secondary stirring tank and the side wall and bottom of the tank body (201) of the secondary stirring tank.

9. The cement-clay slurry stirring device for goaf according to claim 8, characterized in that: The composite anti-sedimentation system further comprises a mechanical scraper installed at the end of the stirring blade (202) of the secondary stirring tank.

10. A method for stirring cement-clay slurry for goaf, implemented by using a cement-clay slurry stirring device for goaf according to any one of claims 1 to 9, characterized in that: The steps include: S100: starting the motor to drive the rotating shaft of the stirring blade of the first stirring tank and the rotating shaft of the first stirring tank body to rotate in the opposite direction, adding clay and water from the tank top cover through the weightlessness metering chamber, and starting stirring. The forward rotation of the stirring blade of the first stirring tank and the reverse rotation of the first stirring tank body make the clay blocks contact the stirring blade of the first stirring tank more frequently, thereby making it easier to dissolve in water; S200: During the clay slurry mixing process, the specific gravity of the clay slurry is monitored in real time by an immersed online density meter. When the detection value reaches a preset threshold, the PLC control system triggers the automatic operation, and the pneumatic butterfly valve and the slurry pump are automatically opened according to the control signal. The slurry is measured by the electromagnetic flow meter and then pumped into the secondary mixing tank by the slurry pump. The discharge volume is double-checked by the mass flow meter and the tank liquid level sensor. When the cumulative flow reaches the value required by the process or the liquid level rises to the preset safety height, the pneumatic butterfly valve executes the closing procedure, and the cement addition amount is controlled by the weight loss metering bin; S300: The stirring blades of the secondary mixing tank are connected to the primary mixing tank body and are driven to rotate, breaking up the added cement ash and allowing it to fully dissolve in the clay slurry. At the same time, the ultrasonic vibrator vibrates at high frequency to prevent particle agglomeration. The pneumatic rotary spray device at the bottom blows the cement ash that has settled to the bottom, causing it to be pushed to other parts by the stirring blades of the secondary mixing tank and dissolved in the clay slurry again. After detecting that the specific gravity of the cement-clay slurry reaches a certain threshold, the slurry is pumped out; S400: After the pumping is completed, steps S100 to S300 are repeated, and the clay slurry in the primary mixing tank is discharged into the secondary mixing tank again to form an automated circulation operation.

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