A method for preparing concrete for construction engineering

Abstract

The present invention discloses a method for preparing concrete for engineering construction, which relates to the technical field of concrete preparation and comprises the following steps: Step 1: material preparation, according to a preset ratio, cement, aggregate, sand, water and additives are prepared, wherein cement is selected from high-strength and low-hydration heat cement varieties; aggregate and sand are screened and washed to ensure their cleanliness and particle size distribution; additives include reinforcing agent, water reducing agent and retarder, which are used to improve the strength and construction performance of concrete; Step 2: pre-mixing, cement, aggregate and sand are put into a preparation device according to a certain ratio, and pre-mixing is performed, the purpose of pre-mixing is to preliminarily mix various materials and lay the foundation for the subsequent mixing process. The present invention realizes the efficient preparation of concrete by improving the mixing process, improves production efficiency and reduces production costs.

Description

Technical Field

[0001] The invention relates to the technical field of concrete preparation, in particular to a method for preparing concrete for engineering construction. Background Art

[0002] Concrete mixing is a method of mixing cement, lime, water and other materials and stirring them evenly. Concrete mixing is divided into manual mixing and mechanical mixing. At present, the most widely used mechanical mixing is concrete mixer and concrete mixing drum. Concrete mixer is suitable for large-scale construction, while concrete mixing drum is suitable for small-scale construction.

[0003] The existing mixing barrel includes a barrel body, a mixing shaft arranged along its axial direction, blades integrally connected to the mixing shaft, and a motor arranged on the top of the barrel and connected to the mixing shaft. When the motor rotates, it drives the blades to rotate through the mixing shaft to mix the concrete in the mixing barrel.

[0004] This method can effectively disperse the concrete in the initial stage of concrete mixing. However, as the mixing process proceeds, due to the friction and adhesion between the concrete particles, the concrete is prone to agglomeration or stratification in the mixing container, resulting in uneven mixing. If the concrete is mixed evenly only through mechanical stirring, it will take a long time to stir, which will lead to high energy consumption generated by the mixing.

[0005] In view of this, this application is hereby filed. Summary of the invention

[0006] The object of the present invention is to provide a method for preparing concrete for engineering construction to solve the problems raised in the above-mentioned background technology.

[0007] In order to solve the above technical problems, the present invention provides a method for preparing concrete for engineering construction, comprising the following steps:

[0008] Step 1: Material preparation: prepare cement, aggregate, sand, water and additives according to the preset ratio. Cement with high strength and low hydration heat is selected. Aggregates and sand are sieved and washed to ensure their cleanliness and particle size distribution. Additives include reinforcing agent, water reducing agent and retarder to improve the strength and construction performance of concrete.

[0009] Step 2: Pre-mixing: put cement, aggregate and sand into the preparation equipment in a certain proportion for pre-mixing. The purpose of pre-mixing is to make the various materials preliminarily mixed and lay the foundation for the subsequent mixing process;

[0010] Step 3: Add water and additives, add appropriate amount of water and additives to the preparation equipment and mix with the pre-mixed materials, and stir again; during the stirring process, control the stirring speed and time to fully mix the materials to form a uniform concrete slurry;

[0011] Step 4: Secondary mixing: The mixed concrete slurry is mixed for the second time through the preparation equipment to further improve the uniformity and density of the concrete.

[0012] Furthermore, the preparation equipment used in step 2, step 3 and step 4 includes a preparation tank and a stirring assembly arranged on the preparation tank;

[0013] The stirring assembly includes a sealing cover fixedly installed on the top surface of the preparation tank, an upper turntable is slidably installed inside the sealing cover, a hollow stirring shaft with an open upper end and a closed lower end is rotatably installed on the upper turntable, the hollow stirring shaft, and a plurality of spoiler tubes are connected to the bottom end of the hollow stirring shaft, an air pump for supplying air to the inside of the hollow stirring shaft is fixedly installed on the top of the sealing cover, and a driving mechanism for providing rotational force to the upper turntable is arranged inside the sealing cover.

[0014] Furthermore, the driving mechanism includes a driving motor, a center column is fixedly installed on the inner top wall of the sealing cover, the driving motor is fixedly installed on the bottom end of the driving motor, a connecting disk is fixedly installed on the driving end of the driving motor, a sliding column is slidably installed on the connecting disk, a plurality of sliding columns are provided, and a plurality of the sliding columns are arranged in a circular array on the connecting disk, the bottom end of the connecting disk is fixedly connected to the top surface of the upper turntable, the top ends of the plurality of connecting disks are commonly connected to a ring body, a resistance rod is fixedly installed on the top surface of the ring body, a hollow cylindrical cam is installed on the inner top wall of the sealing cover, the top end of the resistance rod is abutted against the bottom curved surface of the hollow cylindrical cam, and the axis centerline of the hollow cylindrical cam and the axis centerline of the connecting disk are vertically distributed in space.

[0015] Furthermore, it also includes a transmission assembly, which includes a gear ring fixedly mounted on the inner wall of the sealing cover, and a gear meshing with the gear ring is fixedly mounted on the outer wall of the hollow stirring shaft.

[0016] Furthermore, the transmission assembly also includes a fixed frame fixedly mounted on the top surface of the upper turntable, a fixed rod fixedly mounted on the fixed frame, the fixed rod is inserted into the interior of the hollow stirring shaft, and the fixed rod is coaxial with the hollow stirring shaft, a ramp plate is fixedly mounted on the inner wall of the hollow stirring shaft along its length direction, and a plurality of telescopic parts are equidistantly mounted on the outer wall of the fixed rod, and the telescopic parts are telescopically deformed when the hollow stirring shaft rotates.

[0017] Furthermore, the telescopic part includes a connecting ring fixedly mounted on the outer wall of the fixed rod, a sleeve fixedly mounted on the outer wall of the connecting ring, an impact rod slidably mounted inside the sleeve, one end of the impact rod extending into the interior of the sleeve is fixedly connected to a slide plate, and a return spring is fixedly mounted on one end of the slide plate away from the impact rod, and the other end of the return spring is fixedly connected to the inner wall of the sleeve.

[0018] Furthermore, a lower turntable is rotatably mounted on the top wall of the preparation tank, a through hole is opened on the lower turntable for sliding of the hollow stirring shaft, a support spring is sleeved on the outside of the hollow stirring shaft, and the support spring is arranged between the bottom surface of the gear ring and the top surface of the lower turntable.

[0019] Furthermore, there are multiple hollow stirring shafts, which are arranged in a circular array on the upper turntable, and a spiral impeller is connected to the outer wall of each hollow stirring shaft, and the spiral impeller is made of stainless steel.

[0020] Furthermore, the preparation tank comprises a tank body with a hollow structure inside, a discharge port is arranged at the bottom end of the tank body, a feeding port is arranged on the side wall of the upper part of the tank body, and a gate is connected to the bottom end of the discharge port.

[0021] Furthermore, a jacket is fixedly mounted on the outer wall of the tank body, and a liquid inlet pipe and a liquid discharge pipe are fixedly mounted on the side wall of the jacket.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention drives the upper turntable to rotate through a driving mechanism, and the upper turntable drives the hollow stirring shaft installed thereon to stir the concrete material inside the preparation tank, and then supplies air to the inside of the sealing cover through an air pump. The gas enters the inside of the spoiler tube through the hollow stirring shaft and is then ejected from the spoiler tube. Mechanical stirring can effectively mix the materials in the concrete evenly, and pneumatic stirring can further promote the uniform mixing of the concrete and eliminate bubbles by introducing air flow. The combination of these two stirring methods can significantly improve the density of the concrete.

[0024] 2. In the present invention, when the hollow stirring shaft rotates counterclockwise, the ramp plate will follow the rotation of the hollow stirring shaft to undergo circumferential displacement. When the ramp plate is displaced, it will resist the impact rod, causing the impact rod to shrink toward the inside of the sleeve. At this time, the reset spring is in a compressed state. Since the ramp plate has a certain height difference, when the impact rod is separated from the ramp plate, the instantaneous change causes the elastic force of the reset spring to be released, which then drives the impact rod to impact the inner wall of the hollow stirring shaft, so that the impact force of the impact rod can be completely released on the inner wall of the hollow stirring shaft, causing the outer wall of the hollow stirring shaft to generate metal impact vibration. The vibration effect can be used to reduce the viscosity and friction between concrete particles, reduce the agglomeration of cement particles, improve the fluidity of concrete, and further promote the uniform mixing of concrete. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a front view structural schematic diagram of the present invention;

[0026] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention;

[0027] Figure 3 It is a structural schematic diagram of the stirring assembly in the present invention;

[0028] Figure 4 It is a structural schematic diagram of the stirring rod in the present invention;

[0029] Figure 5 It is a schematic diagram of the front cross-sectional structure of the stirring rod in the present invention;

[0030] Figure 6 is a schematic diagram of a side cross-sectional structure of a stirring rod in the present invention;

[0031] Figure 7 It is a schematic diagram of the cross-sectional structure of the telescopic member in the present invention;

[0032] Figure 8 It is a schematic diagram of the connection structure between the gear and the gear ring in the present invention;

[0033] Fig. 9 for Figure 8 Schematic diagram of the cross-sectional structure.

[0034] In the figure:

[0035] 1. Preparation tank; 11. Tank body; 12. Discharge port; 13. Feed port; 14. Gate; 15. Jacket; 16. Liquid inlet pipe; 17. Liquid discharge pipe;

[0036] 2. stirring assembly; 21. lower turntable; 22. hollow stirring shaft; 23. spiral impeller; 24. spoiler tube; 25. sealing cover; 26. upper turntable; 27. center column; 28. driving mechanism; 281. driving motor; 282. connecting plate; 283. sliding column; 284. ring body; 285. abutment rod; 286. hollow cylindrical cam; 29. ​​air pump;

[0037] 3. Transmission assembly; 31. Fixed frame; 32. Fixed rod; 33. Telescopic member; 331. Connecting ring; 332. Sleeve; 333. Impact rod; 334. Slide plate; 335. Return spring; 34. Ramp plate; 35. Gear ring; 36. Gear; 37. Support spring. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] The present invention realizes efficient preparation of concrete by improving the mixing process, improves production efficiency and reduces production cost.

[0040] See also Figure 1-9 , the present invention provides a technical solution:

[0041] A method for preparing concrete for engineering construction comprises the following steps:

[0042] Step 1: Material preparation: prepare cement, aggregate, sand, water and additives according to the preset ratio. Cement with high strength and low hydration heat is selected. Aggregates and sand are sieved and washed to ensure their cleanliness and particle size distribution. Additives include reinforcing agent, water reducing agent and retarder to improve the strength and construction performance of concrete.

[0043] Step 2: Pre-mixing: put cement, aggregate and sand into the preparation equipment in a certain proportion for pre-mixing. The purpose of pre-mixing is to make the various materials preliminarily mixed and lay the foundation for the subsequent mixing process;

[0044] Step 3: Add water and additives, add appropriate amount of water and additives to the preparation equipment and mix with the pre-mixed materials, and stir again; during the stirring process, control the stirring speed and time to fully mix the materials to form a uniform concrete slurry;

[0045] Step 4: Secondary mixing: The mixed concrete slurry is mixed for the second time through the preparation equipment to further improve the uniformity and density of the concrete.

[0046] See also Figure 1 The preparation equipment used in step 2, step 3 and step 4 includes a preparation tank 1 and a stirring assembly 2 arranged on the preparation tank 1; the stirring assembly 2 includes a sealing cover 25 fixedly installed on the top surface of the preparation tank 1, an upper turntable 26 is slidably installed inside the sealing cover 25, a hollow stirring shaft 22 with an open upper end and a closed lower end is rotatably installed on the upper turntable 26, the hollow stirring shaft 22, a plurality of spoiler tubes 24 are connected to the bottom end of the hollow stirring shaft 22, an air pump 29 for supplying air to the inside of the hollow stirring shaft 22 is fixedly installed on the top of the sealing cover 25, and a driving mechanism 28 for providing a rotational force to the upper turntable 26 is arranged inside the sealing cover 25;

[0047] The upper turntable 26 is driven to rotate by the driving mechanism 28, and the upper turntable 26 drives the hollow stirring shaft 22 installed thereon to stir the concrete material inside the preparation tank 1, and then the air pump 29 supplies air to the inside of the sealing cover 25, and the gas enters the inside of the spoiler tube 24 through the hollow stirring shaft 22, and is then ejected from the spoiler tube 24. Mechanical stirring can effectively mix the materials in the concrete evenly, while pneumatic stirring can further promote the uniform mixing of the concrete and eliminate bubbles by introducing air flow. The combination of these two stirring methods can significantly improve the density of the concrete.

[0048] See also Figure 2 and Figure 3 The driving mechanism 28 includes a driving motor 281, a central column 27 is fixedly installed on the inner top wall of the sealing cover 25, the driving motor 281 is fixedly installed on the bottom end of the driving motor 281, a connecting disk 282 is fixedly installed on the driving end of the driving motor 281, a sliding column 283 is slidably installed on the connecting disk 282, a plurality of sliding columns 283 are provided, and a plurality of sliding columns 283 are arranged on the connecting disk 282 in a circular array, the bottom end of the connecting disk 282 is fixedly connected to the top surface of the upper rotating disk 26, the top ends of the plurality of connecting disks 282 are commonly connected to a ring body 284, a resisting rod 285 is fixedly installed on the top surface of the ring body 284, a hollow cylindrical cam 286 is installed on the inner top wall of the sealing cover 25, the top end of the resisting rod 285 is against the bottom curved surface of the hollow cylindrical cam 286, and the axis of the hollow cylindrical cam 286 is vertically distributed in space with the axis of the connecting disk 282;

[0049] When the driving motor 281 is powered on and started, the rotation torque is transmitted to the connecting disk 282, so that the connecting disk 282 is rotated under the drive of the driving motor 281, and the driving motor 281 transmits the torque to the sliding column 283 to rotate the sliding column 283, and the sliding column 283 drives the upper turntable 26 to rotate, and the upper turntable 26 drives the hollow stirring shaft 22 to rotate, so as to achieve the effect of stirring the concrete material inside the preparation tank 1;

[0050] In addition, the sliding column 283 can drive the ring body 284 and the resistance rod 285 to rotate while rotating. The resistance rod 285 will move along the bottom curved surface of the hollow cylindrical cam 286 during the rotation process, and generate a vertical thrust, causing the sliding column 283 to produce a vertical displacement, thereby driving the upper turntable 26 to move back and forth up and down. The reciprocating movement of the upper turntable 26 will drive the hollow stirring shaft 22 to move back and forth vertically inside the preparation tank 1, further improving the stirring efficiency.

[0051] See also Figure 2 , Figure 3 , Figure 8 and Fig. 9 , further comprising a transmission assembly 3, the transmission assembly 3 comprising a gear ring 35 fixedly mounted on the inner wall of the sealing cover 25, and a gear 36 meshing with the gear ring 35 fixedly mounted on the outer wall of the hollow stirring shaft 22;

[0052] When the hollow stirring shaft 22 revolves driven by the upper turntable 26, the gear 36 fixedly mounted on the hollow stirring shaft 22 will mesh with the gear ring 35 for transmission, so that the hollow stirring shaft 22 rotates while revolving, thereby further improving the mixing efficiency and the efficiency of preparing concrete.

[0053] See also Figure 2-Figure 7 The transmission assembly 3 also includes a fixing frame 31 fixedly mounted on the top surface of the upper turntable 26, a fixing rod 32 is fixedly mounted on the fixing frame 31, the fixing rod 32 is inserted into the inside of the hollow stirring shaft 22, and the fixing rod 32 and the hollow stirring shaft 22 are coaxial, and a ramp plate 34 is fixedly mounted on the inner wall of the hollow stirring shaft 22 along its length direction, and a plurality of telescopic members 33 are equidistantly mounted on the outer wall of the fixing rod 32, and the telescopic members 33 are telescopically deformed when the hollow stirring shaft 22 rotates;

[0054] The telescopic member 33 includes a connecting ring 331 fixedly mounted on the outer wall of the fixing rod 32, a sleeve 332 fixedly mounted on the outer wall of the connecting ring 331, a striking rod 333 slidably mounted inside the sleeve 332, a sliding plate 334 fixedly connected to one end of the striking rod 333 extending inside the sleeve 332, a return spring 335 fixedly mounted on one end of the sliding plate 334 away from the return rod 333, and the other end of the return spring 335 fixedly connected to the inner wall of the sleeve 332;

[0055] During the rotation of the hollow stirring shaft 22, the telescopic member 33 will contact the ramp plate 34. When the telescopic member 33 contacts the ramp plate 34, it will contract. When the telescopic member 33 separates from the ramp plate 34, the telescopic member 33 will elastically return to its original position.

[0056] Specific reference Figure 6 and Figure 7 When the hollow stirring shaft 22 rotates counterclockwise, the ramp plate 34 will follow the rotation of the hollow stirring shaft 22 to cause circumferential displacement. When the ramp plate 34 is displaced, it will resist the impact rod 333, causing the impact rod 333 to shrink toward the inside of the sleeve 332. At this time, the return spring 335 is in a compressed state. Since the ramp plate 34 has a certain height difference, when the impact rod 333 is separated from the ramp plate 34, the instantaneous change causes the elastic force of the return spring 335 to be released, and at this time, the impact rod 333 is driven to impact the inner wall of the hollow stirring shaft 22, so that the impact force of the impact rod 333 can be completely released on the inner wall of the hollow stirring shaft 22, causing the outer wall of the hollow stirring shaft 22 to generate metal impact vibration. The vibration effect can reduce the viscosity and friction between concrete particles, reduce the agglomeration of cement particles, improve the fluidity of concrete, and further promote the uniform mixing of concrete.

[0057] See also Figure 4 and Fig. 9 A lower turntable 21 is rotatably mounted on the top wall of the preparation tank 1, and a through hole is provided on the lower turntable 21 for the hollow stirring shaft 22 to slide. A support spring 37 is sleeved on the outer surface of the hollow stirring shaft 22, and the support spring 37 is arranged between the bottom surface of the gear ring 35 and the top surface of the lower turntable 21;

[0058] The support spring 37 is provided to provide an upward thrust for the gear 36 , the hollow stirring shaft 22 and the upper turntable 26 , so that the abutment rod 285 can always abut against the bottom surface of the hollow cylindrical cam 286 .

[0059] See also Figure 3 There are multiple hollow stirring shafts 22, and the multiple hollow stirring shafts 22 are arranged in a circular array on the upper turntable 26. The outer wall of each hollow stirring shaft 22 is connected to a spiral impeller 23, and the spiral impeller 23 is made of stainless steel;

[0060] The concrete material is stirred by cooperating with the multiple hollow stirring shafts 22 and the spiral impellers 23, which greatly improves the stirring efficiency of the concrete.

[0061] See also Figure 1 and Figure 2 The preparation tank 1 includes a tank body 11 with a hollow structure inside, a discharge port 12 is arranged at the bottom of the tank body 11, a feeding port 13 is arranged on the side wall of the upper part of the tank body 11, and a gate plate 14 is connected to the bottom of the discharge port 12.

[0062] A jacket 15 is fixedly mounted on the outer wall of the tank body 11 , and a liquid inlet pipe 16 and a liquid outlet pipe 17 are fixedly mounted on the side wall of the jacket 15 .

[0063] The liquid inlet pipe 16 is provided to facilitate the injection of the medium into the interior of the jacket 15, and the liquid discharge pipe 17 is used to facilitate the discharge of the injected liquid. When the temperature of the concrete needs to be increased to meet specific process requirements, the jacket 15 can inject heating medium to make the concrete in the preparation tank 1 reach the required processing temperature to achieve heating treatment of the concrete. During the concrete mixing process, a large amount of heat will be generated in the mixing tank due to chemical reactions or physical friction. If the temperature is not reduced in time, it may affect the quality of the concrete and even the normal operation of the equipment. At this time, the jacket 15 can inject cooling medium to effectively cool the concrete in the preparation tank 1 to maintain the stability of the production process. The jacket 15 can also play a role in heat preservation, ensuring that the concrete maintains a constant temperature during mixing and transportation, and preventing the performance and quality of the concrete from being affected by temperature changes. By controlling the flow of different media in the jacket 15, the temperature of the concrete can be effectively controlled, thereby strengthening the control of product quality and helping to improve production efficiency.

[0064] Working principle: Cement, aggregate and sand are put into the tank body 11 from the feeding port 13 in a certain proportion, and the driving motor 281 is started. The driving motor 281 transmits the rotation torque to the connecting disk 282, and then the connecting disk 282 is rotated under the drive of the driving motor 281. The driving motor 281 transmits the torque to the sliding column 283 to rotate the sliding column 283, and the sliding column 283 drives the upper turntable 26 to rotate, and the upper turntable 26 drives the hollow stirring shaft 22 to rotate, so as to achieve the effect of stirring the concrete material inside the preparation tank 1;

[0065] In addition, the sliding column 283 can drive the ring body 284 and the resistance rod 285 to rotate while rotating. The resistance rod 285 will move along the bottom curved surface of the hollow cylindrical cam 286 during the rotation process, and generate a vertical thrust, so that the sliding column 283 produces a vertical displacement, thereby driving the upper turntable 26 to move up and down. The reciprocating movement of the upper turntable 26 will drive the hollow stirring shaft 22 to move vertically back and forth inside the preparation tank 1, further improving the stirring efficiency and making various materials preliminarily mixed; turn off the drive motor 281 and then add water and additives to the inside of the tank body 11 from the feeding port 13, and start the drive motor 281 again for stirring; during the stirring process, by controlling the stirring speed and time, the materials are fully mixed to form a uniform concrete slurry; during the stirring process, air is supplied to the inside of the sealing cover 25 through the air pump 29, and the gas enters the inside of the spoiler tube 24 through the hollow stirring shaft 22, and then is ejected from the spoiler tube 24. Mechanical stirring can effectively mix the materials in the concrete evenly, while pneumatic stirring can be By introducing air flow to further promote uniform mixing of concrete and eliminate bubbles, the combination of these two mixing methods can significantly improve the density of concrete; when the hollow stirring shaft 22 rotates counterclockwise, the ramp plate 34 will follow the rotation of the hollow stirring shaft 22 to undergo circumferential displacement, and the ramp plate 34 will resist the impact rod 333 when it is displaced, causing the impact rod 333 to shrink toward the inside of the sleeve 332, at which time the return spring 335 is in a compressed state, and since the ramp plate 34 has a certain height difference, when the impact rod 333 is separated from the ramp plate 34, the instantaneous change causes the elastic force of the return spring 335 to be released, and at this time, the impact rod 333 is driven to impact the inner wall of the hollow stirring shaft 22, so that the impact force of the impact rod 333 can be completely released on the inner wall of the hollow stirring shaft 22, causing the outer wall of the hollow stirring shaft 22 to generate metal impact vibration, and the vibration effect can reduce the viscosity and friction between concrete particles, reduce the agglomeration of cement particles, improve the fluidity of concrete, and further promote uniform mixing of concrete.

Claims

1. A method for preparing concrete for engineering construction, characterized in that: The following steps are involved: Step 1: Material preparation: prepare cement, aggregate, sand, water and additives according to the preset ratio. Cement with high strength and low hydration heat is selected. Aggregates and sand are sieved and washed to ensure their cleanliness and particle size distribution. Additives include reinforcing agent, water reducing agent and retarder to improve the strength and construction performance of concrete. Step 2: Pre-mixing: put cement, aggregate and sand into the preparation equipment in a certain proportion for pre-mixing. The purpose of pre-mixing is to make the various materials preliminarily mixed and lay the foundation for the subsequent mixing process; Step 3: Add water and additives, add appropriate amount of water and additives to the preparation equipment and mix with the pre-mixed materials, and stir again; during the stirring process, control the stirring speed and time to fully mix the materials to form a uniform concrete slurry; Step 4: Secondary mixing: the mixed concrete slurry is mixed for the second time through the preparation equipment to further improve the uniformity and density of the concrete; The preparation equipment used in step 2, step 3 and step 4 comprises a preparation tank (1) and a stirring assembly (2) arranged on the preparation tank (1); The stirring assembly (2) comprises a sealing cover (25) fixedly mounted on the top surface of the preparation tank (1), an upper turntable (26) being slidably mounted inside the sealing cover (25), a hollow stirring shaft (22) with an open upper end and a closed lower end being rotatably mounted on the upper turntable (26), the bottom end of the hollow stirring shaft (22) being connected to a plurality of spoiler tubes (24), an air pump (29) for supplying air to the inside of the hollow stirring shaft (22) being fixedly mounted on the top of the sealing cover (25), and a driving mechanism (28) for providing a rotational force to the upper turntable (26) being arranged inside the sealing cover (25); The driving mechanism (28) comprises a driving motor (281); a central column (27) is fixedly mounted on the inner top wall of the sealing cover (25); the driving motor (281) is fixedly mounted on the bottom end of the driving motor (281); a connecting disk (282) is fixedly mounted on the driving end of the driving motor (281); a sliding column (283) is slidably mounted on the connecting disk (282); a plurality of sliding columns (283) are provided, and the plurality of sliding columns (283) are arranged on the connecting disk (282) in a circular array. The bottom end of the connecting disk (282) is fixedly connected to the top surface of the upper rotating disk (26); the top ends of the multiple connecting disks (282) are commonly connected to a ring body (284); a resisting rod (285) is fixedly mounted on the top surface of the ring body (284); a hollow cylindrical cam (286) is mounted on the inner top wall of the sealing cover (25); the top end of the resisting rod (285) is abutted against the bottom curved surface of the hollow cylindrical cam (286); and the axis of the hollow cylindrical cam (286) is spatially vertically distributed with the axis of the connecting disk (282).

2. A method for preparing concrete for construction engineering as claimed in claim 1, characterized in that: It also comprises a transmission assembly (3), the transmission assembly (3) comprising a toothed ring (35) fixedly mounted on the inner wall of the sealing cover (25), and a gear (36) meshing with the toothed ring (35) fixedly mounted on the outer wall of the hollow stirring shaft (22).

3. A method for preparing concrete for construction engineering as claimed in claim 2, characterized in that: The transmission assembly (3) further comprises a fixing frame (31) fixedly mounted on the top surface of the upper turntable (26); a fixing rod (32) is fixedly mounted on the fixing frame (31); the fixing rod (32) is inserted into the interior of the hollow stirring shaft (22); the fixing rod (32) and the hollow stirring shaft (22) are coaxial; a ramp plate (34) is fixedly mounted on the inner wall of the hollow stirring shaft (22) along its length direction; a plurality of telescopic members (33) are equidistantly mounted on the outer wall of the fixing rod (32); the telescopic members (33) are telescopically deformed when the hollow stirring shaft (22) rotates.

4. A method for preparing concrete for construction engineering as claimed in claim 3, characterized in that: The telescopic member (33) comprises a connecting ring (331) fixedly mounted on the outer wall of the fixing rod (32); a sleeve (332) is fixedly mounted on the outer wall of the connecting ring (331); a striking rod (333) is slidably mounted inside the sleeve (332); one end of the striking rod (333) extending into the interior of the sleeve (332) is fixedly connected to a slide plate (334); one end of the slide plate (334) away from the striking rod (333) is fixedly mounted to a return spring (335); the other end of the return spring (335) is fixedly connected to the inner wall of the sleeve (332).

5. A method for preparing concrete for construction engineering as claimed in claim 4, characterized in that: A lower turntable (21) is rotatably mounted on the top wall of the preparation tank (1), and a through hole is provided on the lower turntable (21) for sliding a hollow stirring shaft (22). A support spring (37) is sleeved on the outside of the hollow stirring shaft (22), and the support spring (37) is arranged between the bottom surface of the gear ring (35) and the top surface of the lower turntable (21).

6. A method for preparing concrete for construction engineering as claimed in claim 1, characterized in that: A plurality of the hollow stirring shafts (22) are provided, and the plurality of the hollow stirring shafts (22) are arranged in a circular array on the upper turntable (26), and a spiral impeller (23) is connected to the outer wall of each of the hollow stirring shafts (22), and the spiral impeller (23) is made of stainless steel.

7. A method for preparing concrete for engineering construction as claimed in claim 1, characterized in that: The preparation tank (1) comprises a tank body (11) with a hollow structure inside, a discharge port (12) is arranged at the bottom end of the tank body (11), a feeding port (13) is arranged on the side wall of the upper part of the tank body (11), and a gate plate (14) is connected to the bottom end of the discharge port (12).

8. A method for preparing concrete for construction engineering as claimed in claim 7, characterized in that: A jacket (15) is fixedly mounted on the outer wall of the tank body (11), and a liquid inlet pipe (16) and a liquid discharge pipe (17) are fixedly mounted on the side wall of the jacket (15).

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