Concrete stirring device for water conservancy and hydropower construction

Abstract

The invention discloses a concrete mixing device for water conservancy and hydropower construction, which belongs to the technical field of assembly equipment and comprises a mixing drum, a rotating column, a mixing rod, a scraper blade, an air inlet device, a caking crushing device and the like. The rotating column is rotationally connected to the center of the interior of the mixing drum with the inverted-cone-shaped bottom, the air inlet device is arranged on the side wall of the rotating column, and the caking crushing device is arranged at the bottom of the rotating column, so that in the concrete mixing process, the caking crushing device can crush caked concrete and discharge the caked concrete from the top of the fixed drum again, and the concrete mixing efficiency is improved. The utilization rate and the stirring effect of the concrete are improved, the engineering cost is saved, the air inlet device can input a large number of tiny bubbles into the concrete, and the air inlet device can be matched with an air entraining agent to accelerate air introduction, so that the stirring efficiency of the concrete is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of assembly equipment, and in particular relates to a concrete mixing device for water conservancy and hydropower construction. Background Art

[0002] With the high efficiency, high quality and high benefit of water conservancy and hydropower project construction, higher requirements are put forward for concrete mixing technology. Concrete mixing device is a common machine that mixes cement, sand and gravel aggregates and water into concrete mixture.

[0003] Chinese patent document CN211389457U discloses a concrete mixing device that is convenient for cleaning the inner wall, including a barrel body, a mixing shaft arranged in the barrel body, a mixing paddle arranged on the mixing shaft, a motor for driving the mixing shaft to rotate arranged on the outer side of the bottom of the barrel body, and a detachable barrel cover arranged on the upper end of the barrel body; and also includes a scraper, which is staggered at the end of the mixing paddle and fits with the inner wall of the barrel body, and the scraper is an arc-shaped structure. The device can scrape the inner wall and bottom surface of the mixing barrel to prevent the adhesion of concrete, and can easily clean the mixing device and the inside of the barrel body.

[0004] However, in actual use, air-entraining agent needs to be added to concrete mixing to improve the working performance of the concrete mixture. However, the efficiency of the air-entraining agent's reaction and effectiveness determines the speed at which the concrete is mixed. The working efficiency of this device is average during mixing, and it is unable to cooperate with the air-entraining agent to accelerate the introduction of air and improve the mixing efficiency of the concrete. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that the existing concrete mixing device cannot cooperate with an air entraining agent to accelerate the introduction of air and improve the mixing efficiency of concrete. A concrete mixing device for water conservancy and hydropower construction is proposed. A rotating column is rotatably connected to the inner center of a mixing drum with an inverted cone at the bottom, and an air intake device is arranged on the side wall of the rotating column, and an agglomeration crushing device is arranged at the bottom of the rotating column. In the process of mixing concrete, not only can the agglomeration crushing device crush the agglomerated concrete and discharge it from the top of the fixed drum again, thereby improving the utilization rate and mixing effect of concrete and saving engineering costs, but the air intake device can also input a large number of tiny bubbles into the concrete, which can cooperate with the air entraining agent to accelerate the introduction of air and improve the mixing efficiency of concrete.

[0006] In order to solve the above technical problems, the present invention provides a concrete mixing device for water conservancy and hydropower construction, comprising: a mixing drum, a plurality of support plates are fixedly connected to the side walls of the mixing drum, and support legs are fixedly connected to the bottom side walls of the plurality of support plates, a sealing cover is threadedly connected to the bottom outlet of the mixing drum, the top of the mixing drum is open, a fixed box is fixedly connected to the top side wall of the mixing drum, a motor is fixedly connected to the inner top side wall of the fixed box, a rotating column is fixedly connected to the output shaft of the motor, the rotating column passes through the side wall of the fixed box, the rotating column is rotatably connected to the inner center of the mixing drum, a plurality of stirring rods are fixedly connected to the side wall of the rotating column, an air intake device is provided on the side wall of the rotating column, and a caking crushing device is provided at the bottom of the rotating column.

[0007] Preferably, the air intake device includes a second bevel gear, which is fixedly connected to the side wall of the rotating column, the second bevel gear is located in the fixed box, the side wall of the second bevel gear is meshed with the first bevel gear, the side wall of the first bevel gear is fixedly connected to the rotating rod, the side wall of the fixed box is fixedly connected to the air guide cylinder, one end of the rotating rod passes through the side wall of the fixed box and extends into the interior of the air guide cylinder, the end of the rotating rod located inside the air guide cylinder is fixedly connected to the fan blade, a cylindrical air guide cavity is opened in the side wall of the mixing drum, an air guide pipe is fixedly connected between the air guide cylinder and the mixing drum, two ends of the air guide pipe are respectively connected to the interior of the air guide cylinder and the air guide cavity, a plurality of air outlet holes are opened between the air guide cavity and the internal chamber of the mixing drum, and each of the air outlet holes is provided with a microporous membrane.

[0008] Preferably, the air guide cylinder is arranged in a cone shape.

[0009] Preferably, a Teflon coating is provided on one side surface of the microporous membrane close to the interior of the mixing drum.

[0010] Preferably, the microporous membrane is made of pressure-resistant polypropylene, and a plurality of 0.5 mm micropores are provided on the microporous membrane.

[0011] Preferably, the agglomeration crushing device includes a fixed cylinder, in which a spiral rod is rotatably connected, the upper end of the spiral rod is fixedly connected to the bottom end of the rotating column, and the side wall of the fixed cylinder is fixedly connected to the bottom of the mixing cylinder through two fixed rods, and the bottom end of the fixed cylinder is located at the bottom center of the mixing cylinder.

[0012] Preferably, the distance between the spiral leaves on the spiral rod gradually decreases from bottom to top.

[0013] Preferably, the plurality of stirring rods are arranged in two rows on both sides of the rotating column, one end of the plurality of stirring rods in each row is fixedly connected with a scraper, and the two scrapers are vertically pressed against the inner wall of the mixing drum.

[0014] Preferably, the scraper has a triangular cross-section, and one edge of the scraper rests against the inner wall of the mixing drum.

[0015] Preferably, the bottom of the mixing drum is in an inverted cone shape.

[0016] Beneficial effects of the present invention: 1. This scheme is reasonably designed. In the process of mixing concrete, it can not only crush the agglomerated concrete to improve the concrete mixing effect, but also input a large number of tiny bubbles into the concrete, which can be combined with air entraining agents to accelerate the introduction of air and improve the mixing efficiency of concrete.

[0017] 2. This solution provides a rotating screw rod, and the concrete mixing device can transport the agglomerated concrete at the bottom of the mixing drum upward through the rotating screw rod. Since the distance between the spiral leaves on the screw rod gradually decreases from bottom to top, the screw rod can crush the agglomerated concrete and then discharge it from the top of the fixed drum again. This not only solves the problem that the agglomerated concrete in the concrete mixing device is easily deposited at the bottom, but also improves the utilization rate of concrete and saves engineering costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings. The drawings are only for the purpose of illustrating preferred embodiments and are not to be considered as limiting the present invention. Also, the same reference symbols are used throughout the drawings to represent the same parts.

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a front cross-sectional structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of the top cross-sectional structure of the mixing drum in the present invention; Figure 4 It is a schematic diagram of the side cross-sectional structure of the microporous membrane in the present invention.

[0020] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Fixed box; 2. First bevel gear; 3. Motor; 4. Second bevel gear; 5. Rotating column; 6. Stirring rod; 7. Microporous membrane; 8. Air outlet; 9. Air guide cavity; 10. Fan blade; 11. Rotating rod; 12. Air guide cylinder; 13. Air guide tube; 14. Support plate; 15. Support leg; 16. Sealing cover; 17. Screw rod; 18. Fixed cylinder; 19. Fixed rod; 20. Stirring cylinder; 21. Scraper; 22. Teflon coating. DETAILED DESCRIPTION

[0021] 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 in conjunction with the accompanying drawings and embodiments. It should be understood that the specific implementation method described herein is only an optimal embodiment of the present invention, which is only used to explain the present invention and does not limit the scope of protection of the present invention. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] Example 1: Figure 1 As shown, a concrete mixing device for water conservancy and hydropower construction includes: a mixing drum 20, a plurality of support plates 14 are fixedly connected to the side walls of the mixing drum 20, support legs 15 are fixedly connected to the bottom side walls of the plurality of support plates 14, a blocking cover 16 is threadedly connected to the bottom outlet of the mixing drum 20, the top of the mixing drum 20 is open, a fixed box 1 is fixedly connected to the top side wall of the mixing drum 20, a motor 3 is fixedly connected to the inner top side wall of the fixed box 1, a rotating column 5 is fixedly connected to the output shaft of the motor 3, the rotating column 5 passes through the side wall of the fixed box 1, the rotating column 5 is rotatably connected to the inner center of the mixing drum 20, a plurality of stirring rods 6 are fixedly connected to the side wall of the rotating column 5, an air intake device is provided on the side wall of the rotating column 5, and a caking crushing device is provided at the bottom of the rotating column 5.

[0023] Specifically, the air intake device includes a second bevel gear 4, which is fixedly connected to the side wall of the rotating column 5. The second bevel gear 4 is located in the fixed box 1, and the first bevel gear 2 is meshed and connected to the side wall of the second bevel gear 4. The side wall of the first bevel gear 2 is fixedly connected to a rotating rod 11, and the side wall of the fixed box 1 is fixedly connected to an air guide cylinder 12. One end of the rotating rod 11 penetrates the side wall of the fixed box 1 and extends into the interior of the air guide cylinder 12. The end of the rotating rod 11 located inside the air guide cylinder 12 is fixedly connected to a fan blade 10. A cylindrical air guide cavity 9 is opened in the side wall of the mixing drum 20, and an air guide pipe 13 is fixedly connected between the air guide cylinder 12 and the mixing drum 20. Both ends of the air guide pipe 13 are respectively connected to the interior of the air guide cylinder 12 and the air guide cavity 9. A plurality of air outlet holes 8 are opened between the air guide cavity 9 and the internal chamber of the mixing drum 20, and each air outlet hole 8 is provided with a microporous membrane 7.

[0024] Specifically, the air guide cylinder 12 is arranged in a cone shape.

[0025] Specifically, a Teflon coating 22 is provided on one surface of the microporous membrane 7 close to the inside of the mixing drum 20 .

[0026] After the concrete is put into the mixing drum 20 from the top, the motor 3 can be started, and the motor 3 will drive the rotating column 5 to rotate. The rotation of the rotating column 5 can drive the multiple mixing rods 6 and the scraper 21 to rotate and mix the concrete. The concrete adhered to the inner wall of the mixing drum 20 can be scraped off during the rotation of the scraper 21. The rotating column 5 can drive the rotating rod 11 to rotate through the second bevel gear 4 and the first bevel gear 2. The rotation of the rotating rod 11 can drive the fan blade 10 to rotate. The rotation of the fan blade 10 can compress the external airflow into the air guide cylinder 12, and then the airflow enters the air guide cavity 9 along the air guide pipe 13. Finally, the compressed airflow passes through the micropores on the multiple microporous membranes 7 and enters the concrete in the mixing drum 20 in the form of tiny bubbles. The tiny bubbles can cooperate with the air entraining agent to accelerate the introduction of air and improve the mixing efficiency of the concrete.

[0027] Embodiment 2: A concrete mixing device for water conservancy and hydropower construction, comprising: a mixing drum 20, a plurality of support plates 14 are fixedly connected to the side walls of the mixing drum 20, support legs 15 are fixedly connected to the bottom side walls of the plurality of support plates 14, a sealing cover 16 is threadedly connected to the bottom outlet of the mixing drum 20, the top of the mixing drum 20 is open, a fixed box 1 is fixedly connected to the top side wall of the mixing drum 20, a motor 3 is fixedly connected to the inner top side wall of the fixed box 1, a rotating column 5 is fixedly connected to the output shaft of the motor 3, the rotating column 5 passes through the side wall of the fixed box 1, the rotating column 5 is rotatably connected to the inner center of the mixing drum 20, a plurality of stirring rods 6 are fixedly connected to the side wall of the rotating column 5, an air intake device is provided on the side wall of the rotating column 5, and a caking crushing device is provided at the bottom of the rotating column 5.

[0028] Specifically, the agglomeration crushing device includes a fixed cylinder 18, in which a spiral rod 17 is rotatably connected, the upper end of the spiral rod 17 is fixedly connected to the bottom end of the rotating column 5, and the side wall of the fixed cylinder 18 is fixedly connected to the bottom of the mixing cylinder 20 through two fixed rods 19, and the bottom end of the fixed cylinder 18 is located at the bottom center of the mixing cylinder 20.

[0029] Specifically, the distance between the spiral leaves on the spiral rod 17 gradually decreases from bottom to top.

[0030] Specifically, the plurality of stirring rods 6 are arranged in two rows on both sides of the rotating column 5 , and one end of the plurality of stirring rods 6 in each row is fixedly connected with a scraper 21 , and the two scrapers 21 are vertically pressed against the inner wall of the mixing drum 20 .

[0031] Specifically, the scraper 21 has a triangular cross section, and one edge of the scraper 21 abuts against the inner wall of the mixing drum 20 .

[0032] Specifically, the bottom of the mixing drum 20 is in an inverted cone shape.

[0033] After the concrete is put into the mixing drum 20 from the top of the mixing drum 20, the motor 3 can be started, and the motor 3 will drive the rotating column 5 to rotate. The rotation of the rotating column 5 can drive the multiple mixing rods 6 and the scraper 21 to rotate and mix the concrete. The scraper 21 can scrape off the concrete adhering to the inner wall of the mixing drum 20 during the rotation process. The rotation of the rotating column 5 can drive the spiral rod 17 at the bottom to rotate, wherein the agglomerated part of the concrete is easily deposited at the bottom, and the rotating spiral rod 17 can make the agglomerated concrete at the bottom of the mixing drum 20 spiral upward along the spiral rod 17. Since the distance between the spiral leaves on the spiral rod 17 gradually decreases from bottom to top, the spiral rod 17 can crush the agglomerated concrete and then discharge it from the top of the fixed drum 18 again. By setting the rotating spiral rod 17, the concrete mixing device can transport the agglomerated concrete at the bottom of the mixing drum 20 upward through the rotating spiral rod 17, and since the distance between the spiral leaves on the spiral rod 17 gradually decreases from bottom to top, the spiral rod 17 can crush the agglomerated concrete and then discharge it from the top of the fixed drum 18 again. This not only solves the problem that the agglomerated part of the concrete in the concrete mixing device is easily deposited at the bottom, but also improves the utilization rate of the concrete and saves engineering costs.

[0034] Example 3: Please refer to Figures 1 to 4 In an embodiment of the present invention, a concrete mixing device for water conservancy and hydropower construction includes a mixing drum 20, a plurality of support plates 14 are fixedly connected to the side wall of the mixing drum 20, support legs 15 are fixedly connected to the bottom side walls of the plurality of support plates 14, a blocking cover 16 is threadedly connected to the bottom outlet of the mixing drum 20, the top of the mixing drum 20 is open, a fixing box 1 is fixedly connected to the top side wall of the mixing drum 20, a motor 3 is fixedly connected to the inner top side wall of the fixing box 1, a rotating column 5 is fixedly connected to the output shaft of the motor 3, and the rotating column 5 passes through the side wall of the fixing box 1. The rotating column 5 is rotatably connected to the inner center of the mixing drum 20, and a plurality of stirring rods 6 are fixedly connected to the side wall of the rotating column 5. The plurality of stirring rods 6 are arranged in two rows on both sides of the rotating column 5, and a scraper 21 is fixedly connected to one end of the plurality of stirring rods 6 in each row. The two scrapers 21 are both vertically pressed against the inner wall of the mixing drum 20. The cross-section of the scraper 21 is triangular, and one edge of the scraper 21 is pressed against the inner wall of the mixing drum 20. The bottom of the mixing drum 20 is in an inverted cone shape. An air intake device is provided on the side wall of the rotating column 5, and a lump crushing device is provided at the bottom of the rotating column 5.

[0035] Specifically, the air intake device includes a second bevel gear 4, which is fixedly connected to the side wall of the rotating column 5. The second bevel gear 4 is located in the fixed box 1. The first bevel gear 2 is meshed and connected to the side wall of the second bevel gear 4. The rotating rod 11 is fixedly connected to the side wall of the first bevel gear 2. The air guide cylinder 12 is fixedly connected to the side wall of the fixed box 1. One end of the rotating rod 11 penetrates the side wall of the fixed box 1 and extends into the interior of the air guide cylinder 12. The end of the rotating rod 11 located inside the air guide cylinder 12 is fixedly connected to the fan blade 10. A cylindrical air guide cavity 9 is opened in the side wall of the mixing drum 20. An air guide pipe 13 is fixedly connected between the air guide cylinder 12 and the mixing drum 20. The two ends of the air guide pipe 13 are respectively connected to the interior of the air guide cylinder 12 and the air guide cavity 9. A plurality of air outlet holes 8 are provided between the air guide cavity 9 and the inner chamber of the mixing drum 20, each of which is provided with a microporous membrane 7. The air guide cylinder 12 is arranged in a conical shape, and a Teflon coating 22 is provided on the surface of the microporous membrane 7 on one side close to the inside of the mixing drum 20. The microporous membrane 7 is made of pressure-resistant polypropylene, and a plurality of 0.5 mm micropores are provided on the microporous membrane 7. The microporous membrane 7 has a waterproof and breathable effect. When the fan blades 10 rotate, the external airflow can be compressed into the air guide cylinder 12, and then the airflow enters the air guide cavity 9 along the air guide pipe 13. Finally, the compressed airflow passes through the micropores on the plurality of microporous membranes 7 and enters the concrete in the mixing drum 20 in the form of tiny bubbles. The tiny bubbles can cooperate with the air entraining agent to accelerate the introduction of air and improve the mixing efficiency of the concrete.

[0036] Specifically, the agglomerate crushing device includes a fixed barrel 18, in which a spiral rod 17 is rotatably connected, the upper end of the spiral rod 17 is fixedly connected to the bottom end of the rotating column 5, and the side wall of the fixed barrel 18 is fixedly connected to the bottom of the mixing barrel 20 through two fixed rods 19. The bottom end of the fixed barrel 18 is located at the central position of the bottom of the mixing barrel 20. The distance between the spiral leaves on the spiral rod 17 gradually decreases from bottom to top, and the agglomerated part of the concrete is easily deposited at the bottom of the mixing barrel 20. The rotating spiral rod 17 can make the concrete agglomerated at the bottom of the mixing barrel 20 spirally rise along the spiral rod 17. Since the distance between the spiral leaves on the spiral rod 17 gradually decreases from bottom to top, the spiral rod 17 can crush the agglomerated concrete and then discharge it from the top of the fixed barrel 18 again.

[0037] The working principle of the present invention is: After the concrete is put into the mixing drum 20 from the top, the motor 3 can be started, and the motor 3 will drive the rotating column 5 to rotate. The rotation of the rotating column 5 can drive the multiple mixing rods 6 and the scraper 21 to rotate and mix the concrete. The scraper 21 can scrape off the concrete adhering to the inner wall of the mixing drum 20 during the rotation. The rotation of the rotating column 5 can drive the spiral rod 17 at the bottom to rotate, wherein the agglomerated part of the concrete is easily deposited at the bottom. The rotating spiral rod 17 can make the concrete agglomerated at the bottom of the mixing drum 20 spirally rise along the spiral rod 17. Since the distance between the spiral leaves on the spiral rod 17 gradually decreases from bottom to top, the spiral rod 17 can crush the agglomerated concrete and then discharge it from the top of the fixed drum 18 again. While the rotating column 5 rotates, the rotating column 5 can drive the rotating rod 11 to rotate through the second bevel gear 4 and the first bevel gear 2. The rotation of the rotating rod 11 can drive the fan blades 10 to rotate. The rotation of the fan blades 10 can compress the external airflow into the air guide cylinder 12, and then the airflow enters the air guide cavity 9 along the air guide pipe 13. Finally, the compressed airflow passes through the micropores on the multiple microporous membranes 7 and enters the concrete in the mixing drum 20 in the form of tiny bubbles. The tiny bubbles can cooperate with the air entraining agent to accelerate the introduction of air and improve the mixing efficiency of the concrete.

[0038] The above specific embodiments are preferred embodiments of the present invention, and are not intended to limit the specific implementation scope of the present invention. The scope of the present invention includes but is not limited to the present specific embodiments. All equivalent changes made in accordance with the shape, structure, and method of the present invention are within the protection scope of the present invention.

Claims

1. A concrete mixing device for water conservancy and hydropower construction, characterized in that: The invention comprises a mixing drum (20), wherein a plurality of support plates (14) are fixedly connected to the side wall of the mixing drum (20), and support legs (15) are fixedly connected to the bottom side walls of the plurality of support plates (14). A blocking cover (16) is threadedly connected to the bottom outlet of the mixing drum (20). The top of the mixing drum (20) is arranged to be open, and a fixing box (1) is fixedly connected to the top side wall of the mixing drum (20). A motor (3) is fixedly connected to the inner top side wall of the fixing box (1), and an output shaft of the motor (3) is fixedly connected to a rotating column (5). The rotating column (5) passes through the side wall of the fixing box (1), and the rotating column (5) is rotatably connected to the inner center of the mixing drum (20). A plurality of mixing rods (6) are fixedly connected to the side wall of the rotating column (5), and an air intake device is provided on the side wall of the rotating column (5). A lump crushing device is provided at the bottom of the rotating column (5).

2. A concrete mixing device for water conservancy and hydropower construction according to claim 1, characterized in that: The air intake device comprises a second bevel gear (4), the second bevel gear (4) being fixedly connected to a side wall of a rotating column (5), the second bevel gear (4) being located in a fixed box (1), the side wall of the second bevel gear (4) being meshingly connected to a first bevel gear (2), the side wall of the first bevel gear (2) being fixedly connected to a rotating rod (11), the side wall of the fixed box (1) being fixedly connected to an air guide cylinder (12), one end of the rotating rod (11) passing through the side wall of the fixed box (1) and extending into the interior of the air guide cylinder (12), One end of the rotating rod (11) located inside the air guide cylinder (12) is fixedly connected to a fan blade (10); a cylindrical air guide cavity (9) is provided in the side wall of the mixing drum (20); an air guide pipe (13) is fixedly connected between the air guide cylinder (12) and the mixing drum (20); two ends of the air guide pipe (13) are respectively connected to the inside of the air guide cylinder (12) and the air guide cavity (9); a plurality of air outlet holes (8) are provided between the air guide cavity (9) and the internal chamber of the mixing drum (20); and each of the air outlet holes (8) is provided with a microporous membrane (7).

3. A concrete mixing device for water conservancy and hydropower construction according to claim 2, characterized in that: The air guide cylinder (12) is arranged in a conical shape.

4. A concrete mixing device for water conservancy and hydropower construction according to claim 2, characterized in that: A Teflon coating (22) is provided on the surface of one side of the microporous membrane (7) close to the interior of the mixing drum (20).

5. A concrete mixing device for water conservancy and hydropower construction according to claim 4, characterized in that: The microporous membrane (7) is made of pressure-resistant polypropylene, and a plurality of 0.5 mm micropores are provided on the microporous membrane (7).

6. A concrete mixing device for water conservancy and hydropower construction according to claim 1, characterized in that: The agglomeration crushing device comprises a fixed cylinder (18), a spiral rod (17) rotatably connected inside the fixed cylinder (18), the upper end of the spiral rod (17) being fixedly connected to the bottom end of a rotating column (5), the side wall of the fixed cylinder (18) being fixedly connected to the bottom of a mixing cylinder (20) via two fixed rods (19), the bottom end of the fixed cylinder (18) being located at the center of the bottom of the mixing cylinder (20).

7. A concrete mixing device for water conservancy and hydropower construction according to claim 6, characterized in that: The distance between the spiral leaves on the spiral rod (17) gradually decreases from bottom to top.

8. A concrete mixing device for water conservancy and hydropower construction according to claim 1, characterized in that: The plurality of stirring rods (6) are arranged in two rows on both sides of the rotating column (5), one end of the plurality of stirring rods (6) in each row is fixedly connected to a scraper (21), and the two scrapers (21) are vertically pressed against the inner wall of the stirring drum (20).

9. A concrete mixing device for water conservancy and hydropower construction according to claim 8, characterized in that: The scraper (21) has a triangular cross-section, and one edge of the scraper (21) abuts against the inner wall of the mixing drum (20).

10. A concrete mixing device for water conservancy and hydropower construction according to claim 9, characterized in that: The bottom of the mixing drum (20) is arranged in an inverted cone shape.

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