CN117124467A - Ash mixture humidifying secondary mixing device and mixing method - Google Patents

Abstract

The application provides a humidifying secondary mixing device and a mixing method for a lime-soil mixture, and relates to the field of lime-soil mixing. The device comprises two mixing mechanisms and a conveyor belt arranged between the two mixing mechanisms, wherein the mixing mechanisms comprise a mixing tank, a mixing shaft provided with mixing blades and a plurality of atomizing nozzles are arranged in the mixing tank, and the variable-frequency water pump supplies water to the atomizing nozzles through a pipeline; one end of the conveyor belt is positioned below the discharge end of one mixing tank, and the other end of the conveyor belt is positioned above the feed end of the other mixing tank; the water-saving device is characterized in that a protective cover is arranged on the conveyor belt, a moisture meter is arranged in the protective cover, the moisture meter collects the numerical value of the water content of the mixture on the conveyor belt and conveys the numerical value to a controller through a signal wire, and the controller controls the output flow of the variable-frequency water pump. The application has the effect of accurately measuring and improving the water content of the mixture.

Description

Ash mixture humidifying secondary mixing device and mixing method

Technical Field

The application relates to the field of lime soil mixing, in particular to a lime soil mixture humidifying secondary mixing device and a lime soil mixture humidifying secondary mixing method.

Background

The filling construction of the lime soil roadbed is generally divided into a plant mixing method and a road mixing method, the road mixing method is generally used for sequentially spreading plain soil and lime soil, and then rotary tillage mixing is carried out by using a regenerator.

At present, the traditional plant mixing method generally utilizes a mixer to mix according to the mixing proportion of each admixture and then to be transported to the site for construction, but when the quantity of the mixture is more, the moisture content of the soil is uneven, if the mixture is completely mixed with water according to the test condition, the moisture content of the mixture is difficult to meet the design requirement, the compaction difficulty of the roadbed on the site is increased, even the problems of 'rubber soil', 'firm soil' and the like occur, secondary replacement and filling are needed after digging, and a large amount of construction cost is lost.

Disclosure of Invention

In order to solve the problem that the water content of the mixture in the traditional plant mixing method is difficult to meet the design requirement, the application provides a device and a method for humidifying and secondary mixing of a lime-soil mixture.

In a first aspect, the application provides a humidifying secondary mixing device for a lime-soil mixture, which adopts the following technical scheme:

the secondary mixing device comprises two mixing mechanisms and a conveyor belt arranged between the two mixing mechanisms, wherein the mixing mechanisms comprise a mixing tank, a mixing shaft provided with mixing blades and a plurality of atomizing nozzles are arranged in the mixing tank, and the variable-frequency water pump supplies water to the atomizing nozzles through a pipeline;

one end of the conveyor belt is positioned below the discharge end of one mixing tank, and the other end of the conveyor belt is positioned above the feed end of the other mixing tank;

the water-saving device is characterized in that a protective cover is arranged on the conveyor belt, a moisture meter is arranged in the protective cover, the moisture meter collects the numerical value of the water content of the mixture on the conveyor belt and conveys the numerical value to a controller through a signal wire, and the controller controls the output flow of the variable-frequency water pump.

Through adopting above-mentioned technical scheme, add the mix jar that is located the front end with multiple material earlier, mix motor drive mix axle and mix blade rotation, realize the mixture of multiple material, simultaneously, corresponding variable frequency water pump starts, with water pump to atomizer, atomizer blowout vaporific rivers, on the one hand is used for improving the moisture content of mixture, on the other hand can prevent that materials such as lime from continuously floating and can't mix with other materials in the mix jar, atomizer spun water yield reaches after the required water yield of design moisture content, variable frequency water pump stops pumping, mix motor continues to rotate.

After various materials in the mixing tank at the front end are completely mixed with water flow, the mixture is put on a conveyor belt below from the discharge end of the mixing tank, and is conveyed to the mixing tank at the rear end through the conveyor belt. The setting of protection casing can prevent that the mixture from consuming too much moisture on the in-process that the conveyer belt removed, simultaneously, the moisture meter at protection casing top can carry out the direct measurement to the moisture content of mixture on line, and pass through the signal line with the moisture content numerical value that gathers and transmit to the controller, after the numerical value analysis, carry out the adjustment to the output flow of the variable frequency water pump that the blending jar that is located the rear end corresponds, the conveyer belt carries the mixture to the blending jar that is located the rear end, and the output flow of the variable frequency water pump that this blending jar corresponds has been adjusted, in this way, can carry out the secondary mix to the mixture in the blending jar, after the mix finishes, carry out the measurement of moisture content again, if up to standard, carry the mixture after the secondary mix to the job site, if not up to standard, adjust the output flow of variable frequency water pump again, up to standard to the moisture content of mixture.

Optionally, a weighing sensor is further arranged on the conveyor belt, and the weighing sensor is used for weighing the mixture on the conveyor belt.

By adopting the technical scheme, the mixed material after primary mixing is weighed, the water content of the mixed material can be calculated, the water content is compared with the water content directly collected by the water content meter, the accuracy of measuring the water content of the mixed material can be improved, and a parameter basis is provided for the controller to adjust the output flow of the variable-frequency water pump; further, the electronic regulating valve can be arranged at the output end of the variable-frequency water pump, and the controller can control the electronic regulating valve and the variable-frequency water pump simultaneously, so that the water quantity sprayed to the mixture can be controlled more accurately.

Optionally, a mounting frame is arranged in the mixing tank, a plurality of atomizing nozzles are uniformly distributed on the mounting frame, the feeding end of the mixing tank is positioned below the mounting frame, an electric valve is arranged at the discharging end of the mixing tank, and after mixing is finished, the electric valve can be opened, so that the mixture in the mixing tank automatically falls onto a conveying belt;

the stirring blade comprises a spiral part and a horizontal part, the spiral part is arranged at the lower part of the stirring shaft, the horizontal part is arranged at the upper part of the stirring shaft, and the stirring shaft is driven by a stirring motor.

Through adopting above-mentioned technical scheme, evenly arranging a plurality of atomizer on the mounting bracket, can making a plurality of atomizer spun water smoke can form the water curtain, and then play the dust fall effect to the material that easily drifts such as lime, ensure that multiple material can mix evenly fast.

Further, because the mixing blade divide into screw portion and horizontal part, and screw portion is located mixing blade's lower part, like this, screw portion just can upwards carry the material that is located mixing tank bottom to horizontal part to reliably mix under the rotation of horizontal part, realize axial mix through screw portion, realize radial mix through horizontal part, can drive screw portion and horizontal part and rotate simultaneously through a mixing machine, effectively promoted the mixing effect, ensure that the hydrone can gather accurate moisture content numerical value.

Optionally, a feeding mechanism is arranged on the outer side of the mixing tank at the front end of the conveyor belt, the feeding mechanism comprises a square feeding pipe and a pushing block arranged in the feeding pipe, and a hopper communicated with the feeding pipe is arranged at the top of the feeding pipe;

the outer wall of the mixing tank is provided with a charging hole, the charging pipe is inserted into the charging hole, and the pushing block pushes materials added by the hopper to move towards the inside of the mixing tank.

Through adopting above-mentioned technical scheme, when the material is added to the mix in-process, insert the charge door with the filling tube in to remove the ejector pad to the rear side of hopper (namely the ejector pad is kept away from the charge door), then in adding the filling tube with the material through the hopper, then promote the ejector pad towards the direction of charge door again, just can push new material into the mix jar.

Optionally, a screw rod is arranged in the feeding pipe in a penetrating way, the screw rod is connected with the pushing block through threads, the screw rod is coaxially arranged with the pushing block, and the screw rod is driven by a feeding motor.

Through adopting above-mentioned technical scheme, under the drive of feeding motor and square filling tube's spacing effect, the ejector pad can follow the axis direction reciprocating motion of lead screw, realizes the promotion effect to newly added material, moreover, when not needing to add the material, the terminal surface of filling tube and the inner wall parallel and level of blending jar, simultaneously, the ejector pad removes to the state of also parallel and level with the terminal surface of filling tube, can prevent effectively that the mixture in the blending jar from outwards leaking through the charge door.

Optionally, the outside of charge door is equipped with the support frame, be equipped with the pneumatic cylinder on the support frame, the charging tube is located on the support frame, the pneumatic cylinder promotes the charging tube slides on the support frame.

Through adopting above-mentioned technical scheme, the pneumatic cylinder can promote the filling tube and produce the displacement in the horizontal direction, and then adjusts the degree of depth that the filling tube inserted into the blending jar, also just can mix fast between newly added material and the current mixture of being convenient for.

Optionally, the charging hole is located between the spiral part and the horizontal part, and one end of the charging pipe located in the mixing tank is not interfered with the mixing blade.

Through adopting above-mentioned technical scheme, when the material of new interpolation is powdered material such as lime, through the transport of filling tube, can send into the inside of mixture between the material, and after getting into the blending jar, just can contact and mix with the mixture that is upwards carried by screw portion, effectively prevented that powdered material from drifting in the blending jar, caused there is the deviation in the material measurement, lead to the degree of accuracy that the moisture content detected to descend.

Optionally, the outer wall of ejector pad with the laminating of the inner wall of charging tube, the ejector pad is equipped with the jet head towards one side of charge door, still wear to be equipped with the trachea in the ejector pad, tracheal one end with jet head intercommunication, tracheal other end and air supply intercommunication.

Through adopting above-mentioned technical scheme, after the hopper is fully added to newly added material, seal the hopper, the air supply is through the trachea to the air jet head air feed for the ejector pad is at the in-process that promotes the material, and high-speed air current also can play the effect of supplementary promotion, has also promoted the diffusion of material in the inside of mixture, has improved mixing efficiency.

Optionally, an exhaust port is arranged at the top of the mixing tank at the front end of the conveyor belt, the air source blows air to the air jet head through an air pipe, and the air is discharged outwards through the exhaust port after being blown out by the air jet head.

Through adopting above-mentioned technical scheme, the gas that the air supply blown out can reliably flow in the blending jar, just also ensures that gas can cooperate the ejector pad to promote newly added material.

In a second aspect, the application provides a method for humidifying and secondarily mixing a lime-soil mixture, which adopts the following technical scheme:

a humidifying and secondary mixing method for a lime-soil mixture comprises the following steps:

s1, putting a plurality of materials into a mixing tank at the front end of a conveyor belt through a feeding end, starting a variable-frequency water pump to supply water for an atomization nozzle in the mixing tank, and simultaneously driving a mixing blade to rotate by a mixing motor to mix the plurality of materials to obtain a mixture;

s2, delivering the mixture to a conveyor belt from a discharge end of a mixing tank at the front end, and conveying the mixture to a mixing tank at the rear end by the conveyor belt;

s3, measuring the water content of the mixture on the conveying belt by using a water content meter, and transmitting the acquired numerical value to a controller through a signal line;

s4, after the controller processes and judges the numerical information transmitted by the moisture meter, the output flow of the variable-frequency water pump positioned outside the mixing tank at the rear end is adjusted;

s5, the mixing tank at the rear end carries out secondary mixing on the mixture, and then the mixture is put into a conveyor belt for water content measurement;

s6, repeating the steps S2-S5 until the water content of the mixture reaches a specified value.

Through adopting above-mentioned technical scheme, can carry out the moisture content to the mixture that adds water mixing once through the blending jar that is located the front end and detect, if the moisture content does not reach standard, can carry out the secondary mixing at the blending jar that is located the rear end, and before the mixing, the controller can adjust variable frequency water pump's output flow, ensures that the moisture content of mixture reaches or is close to the standard value after the secondary mixing.

In summary, the application has the following beneficial effects:

1. the water content of the mixture on the conveying belt can be directly measured and indirectly calculated through the water content meter and the weighing sensor, the output flow of the variable-frequency water pump is reliably adjusted through the analysis of the water content data by the controller, so that the mixture can reach the standard after being mixed for the second time, and if the mixture does not reach the standard, the output flow of the variable-frequency water pump is adjusted again, and finally the water content of the mixture reaches the standard.

2. Through divide into helical portion and horizontal part with the stirring blade, can realize the axial promotion and the stirring effect to the blending jar lower part to and radial disturbance and the stirring effect to blending jar middle part and upper portion, effectively improved the mixing effect between mixture and the rivers, and then promoted the accuracy that the moisture meter detected the mixture moisture content.

3. Through the cooperation of ejector pad and jet-propelled air current, can carry the material of new interpolation to the inside of the mixture of blending jar fast, when preventing to produce the raise dust, effectively improve the mixing efficiency between material and the mixture of new interpolation.

Drawings

FIG. 1 is a schematic perspective view of the present application;

FIG. 2 is a cross-sectional view of the internal structure of the present application;

FIG. 3 is a reference view showing the assembled state of the atomizing nozzle and the mixing blade;

FIG. 4 is an enlarged schematic view of the structure of FIG. 2A;

FIG. 5 is a schematic perspective view of a charging mechanism;

in the figure: 1. a mixing mechanism; 11. a mixing tank; 111. an electric valve; 112. a feed inlet; 113. an exhaust port; 12. mixing the blades; 121. a spiral part; 122. a horizontal portion; 13. a mixing shaft; 14. an atomizing nozzle; 140. a mounting frame; 15. a mixing motor;

2. a conveyor belt; 20. a protective cover;

3. variable-frequency water pump; 30. a pipe;

4. a moisture meter; 5. a weighing sensor;

6. a charging mechanism; 61. a feeding tube; 62. a pushing block; 63. a hopper; 64. a screw rod; 65. a feed motor; 66. a support frame; 67. a hydraulic cylinder; 68. a jet head; 69. and an air pipe.

Detailed Description

The application is described in further detail below with reference to fig. 1-5.

Fig. 1 is a schematic perspective view of the present application. Referring to fig. 1, a secondary mixing device for humidifying a lime-soil mixture comprises two mixing mechanisms 1 and a conveyor belt 2 arranged between the two mixing mechanisms 1, wherein at least one conveyor belt 2 is used for conveying the mixture of the mixing mechanism 1 positioned at the front end into the mixing mechanism 1 positioned at the rear end, and when the number of the conveyor belt 2 is two or more, the mixture can be conveyed back and forth between the two mixing mechanisms 1.

Fig. 2 is a cross-sectional view of the internal structure of the present application. Referring to fig. 2 in combination with fig. 1, the mixing mechanism 1 comprises a mixing tank 11, a feeding end and an exhaust hole are arranged on the outer side of the upper portion of the mixing tank 11, a discharging end is arranged at the bottom of the mixing tank 11, an electric valve 111 is arranged on the discharging end, a mixing shaft 13 provided with mixing blades 12 and a plurality of atomizing nozzles 14 are arranged in the mixing tank 11, the mixing blades 12 comprise a spiral portion 121 and a horizontal portion 122, the spiral portion 121 is located at the lower portion of the mixing shaft 13 and used for stirring the mixture along the axial direction of the mixing shaft 13, the horizontal portion 122 is located at the upper portion of the mixing shaft 13 and used for stirring the mixture along the radial direction of the mixing shaft 13, and the mixing motor 15 can reliably stir the materials in the mixing tank 11 under the common driving action of the spiral portion 121 and the horizontal portion 122.

FIG. 3 is a reference view showing the assembled state of the atomizing nozzle and the mixing blade. Referring to fig. 3 in combination with fig. 2, a plurality of atomizing nozzles 14 are uniformly distributed on a mounting frame 140, a variable-frequency water pump 3 is arranged on the outer side of the mixing tank 11, the variable-frequency water pump 3 pumps water into the atomizing nozzles 14 through a pipeline 30, an electronic regulating valve is further arranged on the output end of the variable-frequency water pump 3, and a controller can control the variable-frequency water pump 3 and the electronic regulating valve so as to change the water quantity input into the atomizing nozzles 14. The plurality of atomizing nozzles 14 are uniformly distributed on the mounting frame 140, so that an atomized water curtain can be formed in the mixing tank 11, the dust fall effect can be achieved while the water content of the mixture is improved, and the powdery material is prevented from drifting or leaking to the outside of the mixing tank 11 in the mixing tank 11.

Referring to fig. 2, one end of the conveyor belt 2 is arranged below the discharge end of the mixing tank 11 at the front end, the other end of the conveyor belt 2 is arranged above the feed end of the mixing tank 11 at the rear end, a protective cover 20 is arranged on the conveyor belt 2, a moisture meter 4 is arranged in the protective cover 20, the two moisture meters 4 are respectively arranged at two ends of the protective cover 20, the moisture meter 4 can directly collect the water content value of the mixture on the conveyor belt 2 and convey the water content value to the controller through a signal wire, and the controller can analyze and judge the received signal and can control the output flow of the variable-frequency water pump 3. The conveyor belt 2 is also provided with a weighing sensor 5, and the weighing sensor 5 is used for weighing the mixture on the conveyor belt 2.

After the water adding and mixing of various materials are finished in the mixing tank 11 positioned at the front end, an electric valve 111 at the bottom of the mixing tank 11 is opened, the mixture is directly put on the conveyor belt 2, then the mixture is conveyed on the conveyor belt 2 and passes through a protective cover 20, in the process of passing through the protective cover 20, the protective cover 20 can reduce the evaporation of the water in the process of conveying the mixture on the conveyor belt 2, the accuracy of the water content detection of the mixture is improved, meanwhile, two water meters 4 are arranged at the top of the protective cover 20, the water content of the mixture at the front end of the conveyor belt 2, namely the water content of the mixture at the rear end of the conveyor belt 2, can be directly detected through the two water meters 4, the water content value is transmitted to a controller through a signal wire, the controller analyzes the water content value transmitted by the water meters 4, and a plurality of water content values are higher than the standard value, so that the displacement time of the mixture on the conveyor belt 2 is required to be prolonged, the controller is turned off a variable frequency water pump 3, the evaporated and the water content of the mixture is put into the mixing tank 11, and then the water content of the mixture is put on the conveyor belt 2 again for detection; if the water content is slightly lower than the standard value, the conveyor belt 2 conveys all the mixture into the mixing tank 11 at the rear end, and meanwhile, the controller reduces the output flow of the variable-frequency water pump 3, so that the water quantity sprayed by the atomizing nozzle 14 at the rear end is reduced, and the mixture in the mixing tank 11 at the rear end is subjected to secondary mixing; if the water content is far lower than the standard value, the controller increases the output flow of the variable-frequency water pump 3, so that the water content of the mixture can be ensured to be close to or reach the standard value (the standard value contains the water loss of the mixture during transportation) after secondary mixing, and the mixture can be transported to a construction site for use. Further, the weighing sensor 5 on the conveyor belt 2 can weigh the mixture on the conveyor belt 2, and the water content of the mixture can be obtained through calculation, so that the accuracy of water content detection of the mixture can be improved under two detection or calculation modes, and accurate data support is provided for the controller to adjust the output flow of the variable-frequency water pump 3.

Fig. 4 is an enlarged schematic view of the structure at a in fig. 2, and fig. 5 is a schematic perspective view of the charging mechanism. Referring to fig. 4 and 5 and referring to fig. 2, the secondary mixing device further comprises a feeding mechanism 6, the feeding mechanism 6 is arranged on the outer side of the mixing tank 11 at the front end, the feeding mechanism 6 comprises a square feeding pipe 61 and a pushing block 62 arranged in the feeding pipe 61, the outer wall of the pushing block 62 is attached to the inner wall of the feeding pipe 61, a screw rod 64 is coaxially arranged on the inner side of the feeding pipe 61, the pushing block 62 and the screw rod 64 are connected through threads, the screw rod 64 is driven by a feeding motor 65, a jet head 68 is further arranged on one side, facing the feeding port 112, of the pushing block 62, a hopper 63 communicated with the feeding pipe 61 is arranged on the outer wall of the mixing tank 11, the feeding pipe 61 is inserted in the feeding port 112, the feeding motor 65 drives the screw rod 64 to rotate, the pushing block 62 pushes materials fed by the hopper 63 to move towards the mixing tank 11, meanwhile, an air source supplies air to the jet head 68 through an air pipe 69, the jet head 68 jets air flow towards the newly added materials, and accordingly the newly added materials are pushed into the mixing tank 11, and the auxiliary pushing effect on the materials can be achieved.

The outside of charge door 112 is equipped with support frame 66, be equipped with pneumatic cylinder 67 on the support frame 66, charging tube 61 locates on the support frame 66, pneumatic cylinder 67 promotes charging tube 61 and slides on support frame 66, when newly added material is powdered such as lime, pneumatic cylinder 67 promotes charging tube 61 and moves towards the inside of blending jar 11, and make the tip of charging tube 61 be located between screw 121 and horizontal part 122, and can not touch blending blade 12, at this moment, under the effect of ejector pad 62 and air jet 68, newly added material is added to the inside of mixture reliably, and be located the middle part of mixture, in this way, can ensure that newly added material can evenly with the mixture fast, effectively improve the mixing efficiency to the material, when no new material needs to add, pneumatic cylinder 67 outwards pulls charging tube 61, make the tip of charging tube 61 and the inner wall of blending jar 11, simultaneously, ejector pad 62 is located the tip position of charging tube 61, the lateral wall of ejector pad 62 and the terminal surface of charging tube 61 also keep the state of parallel and level, realize the closure effect to the charge door 112 through ejector pad 62.

The embodiment also discloses a method for humidifying and secondary mixing of the lime-soil mixture.

A humidifying and secondary mixing method for a lime-soil mixture comprises the following steps:

s1, putting a plurality of materials into a mixing tank 11 positioned at the front end of a conveyor belt 2 through a feeding end, starting a variable-frequency water pump 3 to supply water to an atomizing nozzle 14 in the mixing tank 11, and simultaneously, driving a mixing blade 12 to rotate by a mixing motor 15 to mix the plurality of materials and obtain a mixture;

s2, delivering the mixture to a conveyor belt 2 from a discharge end of a mixing tank 11 positioned at the front end, and conveying the mixture to the mixing tank 11 positioned at the rear end by the conveyor belt 2;

s3, the moisture meter 4 measures the moisture content of the mixture on the conveyor belt 2, and transmits the acquired numerical value to the controller through a signal line;

s4, after the controller processes and judges the numerical information transmitted by the moisture meter 4, the output flow of the variable-frequency water pump 3 positioned outside the mixing tank 11 at the rear end is adjusted;

s5, after the mixture enters the mixing tank 11 through the feeding end of the mixing tank 11 positioned at the rear end, the mixture can be subjected to secondary mixing, and the mixture is put into the conveyor belt 2 for water content measurement after the secondary mixing is finished;

s6, repeating the steps S2-S5 until the water content of the mixture reaches a specified value.

When the application is primarily mixed by the steps, the water mist sprayed by the atomizing nozzle 14 and various materials can be rapidly disturbed and mixed, so that the water content of the mixed materials approaches to the standard value, the mixed materials are put on the conveyor belt 2 after the primary mixing is finished, the water content of the mixed materials is rapidly and accurately detected, the controller can control the output flow of the variable-frequency water pump 3 according to the alignment result with the standard value, so that the water content of the mixed materials can approach to or reach the standard value after the secondary mixing is carried out on the mixed materials, and the water content of the mixed materials can be rapidly and accurately detected while the mixing effect on various materials is effectively improved.

The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.

Claims (10)

1. The secondary mixing device for humidifying the lime-soil mixture is characterized by comprising two mixing mechanisms (1) and a conveyor belt (2) arranged between the two mixing mechanisms (1), wherein the mixing mechanisms (1) comprise a mixing tank (11), a mixing shaft (13) provided with mixing blades (12) and a plurality of atomizing nozzles (14) are arranged in the mixing tank (11), and a variable-frequency water pump (3) supplies water to the atomizing nozzles (14) through a pipeline (30);

one end of the conveyor belt (2) is positioned below the discharge end of one mixing tank (11), and the other end of the conveyor belt (2) is positioned above the feed end of the other mixing tank (11);

be equipped with protection casing (20) on conveyer belt (2), be equipped with moisture appearance (4) in protection casing (20), the numerical value of the moisture content of mixture on conveyer belt (2) is gathered to moisture appearance (4) to carry to the controller through the signal line, the controller control the output flow of variable frequency water pump (3).

2. The lime-soil mixture humidifying secondary mixing device according to claim 1, wherein a weighing sensor (5) is further arranged on the conveyor belt (2), and the weighing sensor (5) is used for weighing the mixture on the conveyor belt (2).

3. The secondary mixing device for humidifying the lime-soil mixture according to claim 1, wherein a mounting frame (140) is arranged in the mixing tank (11), a plurality of atomizing nozzles (14) are uniformly distributed on the mounting frame (140), a feeding end of the mixing tank (11) is positioned below the mounting frame (140), and an electric valve (111) is arranged at a discharging end of the mixing tank (11);

the stirring blade (12) comprises a spiral part (121) and a horizontal part (122), the spiral part (121) is arranged at the lower part of the stirring shaft (13), the horizontal part (122) is arranged at the upper part of the stirring shaft (13), and the stirring shaft (13) is driven by a stirring motor (15).

4. A secondary mixing device for humidifying a lime-soil mixture according to claim 3, characterized in that a feeding mechanism (6) is arranged on the outer side of a mixing tank (11) positioned at the front end of a conveyor belt (2), the feeding mechanism (6) comprises a square feeding pipe (61) and a pushing block (62) arranged in the feeding pipe (61), and a hopper (63) communicated with the feeding pipe (61) is arranged at the top of the feeding pipe (61);

the outer wall of the mixing tank (11) is provided with a charging hole (112), the charging pipe (61) is inserted into the charging hole (112), and the pushing block (62) pushes materials added by the hopper (63) to move towards the inside of the mixing tank (11).

5. The secondary mixing device for humidifying the lime-soil mixture according to claim 4, wherein a screw rod (64) is arranged in the feeding pipe (61) in a penetrating manner, the screw rod (64) is connected with the pushing block (62) through threads, the screw rod (64) and the pushing block (62) are coaxially arranged, and the screw rod (64) is driven by a feeding motor (65).

6. The secondary mixing device for humidifying the lime-soil mixture according to claim 4, wherein a supporting frame (66) is arranged on the outer side of the charging port (112), a hydraulic cylinder (67) is arranged on the supporting frame (66), the charging pipe (61) is arranged on the supporting frame (66), and the hydraulic cylinder (67) pushes the charging pipe (61) to slide on the supporting frame (66).

7. The secondary mixing device for humidifying the lime-soil mixture according to claim 6, wherein the feeding port (112) is positioned between the spiral part (121) and the horizontal part (122), and the feeding pipe (61) is positioned at one end in the mixing tank (11) and has no mutual interference with the mixing blades (12).

8. The secondary mixing device for humidifying the lime-soil mixture according to claim 6, wherein the outer wall of the pushing block (62) is attached to the inner wall of the feeding pipe (61), a jet head (68) is arranged on one side, facing the feeding port (112), of the pushing block (62), an air pipe (69) is further arranged in the pushing block (62) in a penetrating mode, one end of the air pipe (69) is communicated with the jet head (68), and the other end of the air pipe (69) is communicated with an air source.

9. The secondary mixing device for humidifying the lime-soil mixture according to claim 8, wherein an exhaust port (113) is arranged at the top of the mixing tank (11) positioned at the front end of the conveyor belt (2), the air source blows air to the air jet head (68) through the air pipe (69), and the air is discharged outwards through the exhaust port (113) after being blown out by the air jet head (68).

10. The humidifying and secondary mixing method for the lime-soil mixture is characterized by comprising the following steps of:

s1, putting a plurality of materials into a mixing tank (11) positioned at the front end of a conveyor belt (2) through a feeding end, starting a variable-frequency water pump (3) to supply water for an atomizing nozzle (14) in the mixing tank (11), and simultaneously, driving a mixing blade (12) to rotate by a mixing motor (15) to mix the plurality of materials and obtain a mixture;

s2, delivering the mixture to a conveyor belt (2) from a discharge end of a mixing tank (11) positioned at the front end, and conveying the mixture to the mixing tank (11) positioned at the rear end by the conveyor belt (2);

s3, the moisture meter (4) measures the moisture content of the mixture on the conveyor belt (2), and transmits the acquired numerical value to the controller through a signal line;

s4, after the controller processes and judges the numerical information transmitted by the moisture meter (4), the output flow of the variable-frequency water pump (3) positioned outside the mixing tank (11) at the rear end is adjusted;

s5, a mixing tank (11) positioned at the rear end carries out secondary mixing on the mixture, and then the mixture is put into a conveyor belt (2) for water content measurement;

s6, repeating the steps S2-S5 until the water content of the mixture reaches a specified value.