Concrete mixing device

Abstract

The application provides a concrete mixing device, which comprises an upper tank body, a plurality of lower tank bodies and a variable speed transmission structure; the upper tank body is internally provided with a stirring shaft, and the stirring shaft is drivingly connected with a rotating driving member; the bottom surface of the upper tank body is provided with a plurality of discharge ports, and each discharge port is connected with a gate assembly; the plurality of lower tank bodies are one-to-one correspondingly arranged directly below the plurality of discharge ports, and are all of an open-top structure, so as to communicate the corresponding lower tank bodies and the discharge ports; the inside of each lower tank body is provided with a disturbing shaft, and the variable speed transmission structure can drivingly connect each disturbing shaft with the stirring shaft, so that each disturbing shaft rotates synchronously at a lower speed than the stirring shaft when the stirring shaft rotates. The concrete mixing device provided by the application can simultaneously stir concrete and disturb the stirred concrete, thereby ensuring the supply of concrete on the basis of alleviating the segregation phenomenon of concrete, so as to avoid adversely affecting the construction efficiency.

Description

Technical Field

[0001] This application belongs to the field of concrete mixing technology, specifically relating to a concrete mixing device. Background Technology

[0002] The main raw materials for concrete include cement, sand, gravel, water, and admixtures and mineral admixtures added as needed. In actual production, these materials are mixed to form a homogeneous mixture, which is usually generated and stored in the same chamber.

[0003] Segregation can occur during the storage of concrete. Specifically, due to the differences in density, particle size, and flowability of the components in the mixture, the components will be unevenly distributed under the action of gravity or external force, eventually resulting in two situations: aggregate segregation (aggregate settling) and water bleeding (water rising), which affect the normal use of concrete.

[0004] In existing technologies, to prevent concrete segregation, the output power of the concrete mixing equipment is usually adjusted to slow down the mixing speed, thereby providing gentle disturbance to the concrete and counteracting aggregate settling. At the same time, it can also maintain the activity of the interface between the aggregate and the cement paste, preventing the local aggregation of water and fine particles, thus counteracting water rising.

[0005] The inventors discovered that when using the methods proposed in the prior art to prevent concrete segregation, the concrete mixing equipment cannot be used to mix another batch of concrete. Under certain construction requirements (such as using two types of concrete in a single construction), this will affect the setting of relevant process steps and reduce the overall construction efficiency. Utility Model Content

[0006] This application provides a concrete mixing device designed to simultaneously mix concrete and disturb the mixed concrete, thereby reducing concrete segregation and ensuring concrete supply to avoid adverse effects on construction efficiency.

[0007] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0008] A concrete mixing apparatus is provided, comprising:

[0009] The upper tank has a stirring shaft rotatably mounted inside it, and the stirring shaft is driven by a rotation drive component; the bottom surface of the upper tank has multiple discharge ports arranged circumferentially thereon, and each discharge port is connected to a gate assembly.

[0010] Multiple lower tanks are positioned directly below the multiple discharge ports, each with an open top to ensure one-to-one communication between the lower tanks and the discharge ports; each lower tank has a rotatable agitator shaft inside; and

[0011] A variable speed transmission structure is disposed on the stirring shaft and is connected to each of the stirring shafts so that when the stirring shaft rotates, the variable speed transmission structure can drive the disturbance shaft to rotate, and the rotational speed of the disturbance shaft is less than the rotational speed of the stirring shaft.

[0012] In one possible implementation, the lower end of the stirring shaft passes through the upper tank and extends out, and each of the disturbance shafts passes through the corresponding lower tank and extends out.

[0013] The speed transmission structure includes:

[0014] The drive gear is coaxially disposed on the extended portion of the stirring shaft;

[0015] Multiple transmission rods are arranged around the driving gear and correspond one-to-one with multiple disturbance shafts; the axial direction of each transmission rod is parallel to the vertical direction, and a driven gear meshing with the driving gear is coaxially connected to it; and

[0016] Multiple transmission belts are fitted one-to-one on multiple transmission rods, and each transmission belt is also fitted on the outer periphery of the corresponding stirring shaft so that when the transmission rod rotates, the corresponding disturbance shaft rotates synchronously.

[0017] In each group, the transmission ratio between the driving gear and the driven gear is greater than one, and / or the corresponding transmission ratio between the transmission rod and the stirring shaft is greater than one.

[0018] In one possible implementation, the upper tank further includes:

[0019] A bracket, mounted on the upper tank, is used to support the tank on the ground; and

[0020] A support plate is mounted on the bracket and located on the lower side of the upper tank.

[0021] Each of the lower tanks is mounted on the support plate, and each of the disturbance shafts passes through the support plate and extends to the underside of the support plate.

[0022] Each of the transmission rods is rotatably connected to the support plate, and its lower end passes through the support plate and extends to the underside of the support plate;

[0023] Each of the transmission belts is disposed on the underside of the support plate and is fitted onto the protruding portion of the corresponding disturbance shaft and transmission rod.

[0024] In one possible implementation, the transmission rod is disposed between the corresponding disturbance shaft and the stirring shaft; the bottom of the lower tank has a protrusion extending radially outward therefrom, and the extension direction of the protrusion is all opposite to the corresponding transmission rod;

[0025] The interior of the protrusion is connected to the interior of the lower tank. The protrusion has a downwardly extending discharge pipe, and a valve body is connected to the discharge pipe.

[0026] In one possible implementation, the discharge port extends radially along the upper tank body, and the outer surface of the upper tank body has multiple guide grooves that correspond one-to-one with the multiple discharge ports; the gate assembly includes:

[0027] A baffle is slidably inserted into the guide groove for moving to close the discharge port to restrict material from passing through the discharge port; the baffle is also used to move to avoid the discharge port so that material in the upper tank can be discharged through the discharge port.

[0028] In one possible implementation, a portion of the baffle is located outside the guide groove, and a swing arm is hinged to the baffle located outside the guide groove; the hinge axis of the swing arm is parallel to the horizontal plane and perpendicular to the direction of movement of the baffle.

[0029] The swing arm has a sliding arm, which is slidably disposed along the length direction of the swing arm and has an elastic reset member between it and the swing arm;

[0030] When the swing arm swings to avoid the discharge port, the elastic reset member is in a deformed state to drive the sliding arm to move relative to the swing arm, so that the swing arm swings and drives the baffle to move to the position of closing the discharge port.

[0031] In one possible implementation, the swing end face of the swing arm has a guide shaft extending outward along its length direction, and the sliding arm is disposed on the side facing the swing end of the swing arm and has a mating groove suitable for insertion of the guide shaft.

[0032] The elastic reset component is a spring sleeved on the guide shaft, and the two ends of the spring are respectively connected to the insertion end of the guide shaft and the opening of the mating groove.

[0033] In one possible implementation, the stirring shaft has multiple sets of straight rods arranged spirally at intervals along its axial direction. Each set of straight rods includes two straight rods spaced apart along the axial direction of the stirring shaft, and a side scraper connecting the two straight rods for fitting against the inner circumferential surface of the upper tank.

[0034] In one possible implementation, the inner bottom surface of the upper tank has an upwardly convex structure, and each of the discharge ports is opened on the convex surface of the inner bottom surface of the upper tank.

[0035] The stirring shaft has a lower scraper extending radially outward, the bottom of which is in contact with the inner bottom surface of the upper tank.

[0036] In one possible implementation, the disturbance shaft has multiple sets of protrusions spaced apart along its axial direction, each set of protrusions including multiple protrusions spaced apart circumferentially along the disturbance shaft;

[0037] Each of the protruding rods is connected to the outer peripheral surface of the disturbance shaft and extends away from the disturbance shaft, so that when the disturbance shaft rotates, the protruding rod provides a force to the material in the lower tank.

[0038] In this embodiment, the upper tank is used to stir the materials; specifically, by adding the materials to the upper tank in the original proportion, and by driving the stirring shaft to rotate through the rotating drive component, the materials are uniformly mixed under the shear force generated by the high-speed rotation of the stirring shaft to form concrete.

[0039] In addition, the lower tank is used to agitate the concrete. Specifically, after the concrete is formed, the material can be discharged into the corresponding lower tank through the corresponding outlet by opening the gate assembly. Subsequently, the agitation shaft can agitate the concrete in the lower tank, so that the material remains active under the action of the force generated by the low-speed rotation of the agitation shaft. Specifically, it maintains a three-dimensional spatial distribution and avoids static stratification under the synergistic action of shear force, diffusion force and normal force, so as to suppress segregation.

[0040] The low-speed rotation of the disturbance shaft and the high-speed rotation of the stirring shaft are powered by a speed-changing transmission structure, which eliminates the need for drive components and reduces the manufacturing cost of the device.

[0041] The concrete mixing device provided in this embodiment, compared with the prior art, can simultaneously mix concrete and disturb the mixed concrete, thereby reducing concrete segregation and ensuring concrete supply to avoid adverse effects on construction efficiency. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 This is a three-dimensional structural diagram of the concrete mixing device provided in the embodiments of this application;

[0044] Figure 2 for Figure 1 Front view;

[0045] Figure 3 For along Figure 2 Cross-sectional view of line AA in the middle;

[0046] Figure 4 This is a partial schematic diagram of the upper tank used in the embodiments of this application from an explosion perspective;

[0047] Figure 5 This is a partially enlarged schematic diagram of the upper tank, lower tank, and baffle used in the embodiments of this application from a cross-sectional perspective;

[0048] Figure 6 This is a cross-sectional view of the swing arm and sliding arm used in the embodiments of this application in a combined state.

[0049] Figure 7 This is a three-dimensional structural diagram of the bracket and support plate used in the embodiments of this application in a combined state;

[0050] Figure 8 This is a three-dimensional structural diagram of the stirring shaft used in the embodiments of this application;

[0051] Figure 9 This is a three-dimensional structural diagram of the disturbance shaft used in the embodiments of this application;

[0052] Figure 10 This is a three-dimensional structural diagram of the speed transmission structure used in the embodiments of this application;

[0053] Explanation of reference numerals in the attached drawings: 1. Upper tank; 11. Discharge port; 12. Guide groove; 2. Lower tank; 21. Protrusion; 22. Discharge pipe; 221. Valve body; 3. Variable speed transmission structure; 31. Drive gear; 32. Transmission rod; 321. Driven gear; 33. Transmission belt; 4. Baffle; 41. Swing arm; 411. Guide shaft; 42. Sliding arm; 421. Connecting groove; 5. Bracket; 51. Support plate; 6. Elastic reset component; 10. Stirring shaft; 101. Straight rod; 102. Side scraper; 103. Lower scraper; 20. Disturbance shaft; 201. Protruding rod; 30. Rotation drive component. Detailed Implementation

[0054] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0055] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0056] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0057] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0058] Please refer to the following: Figures 1 to 10 The concrete mixing device provided in this application will now be described. The concrete mixing device proposed in this application includes an upper tank 1, multiple lower tanks 2, and a speed-changing transmission structure 3.

[0059] The upper tank 1 has a hollow internal structure, with its upper end serving as the feeding end. Specifically, the top surface of the upper tank 1 has an inlet communicating with its interior, and this inlet is equipped with a funnel-shaped guide platform to allow materials to enter the upper tank 1 in batches and quickly. An agitator shaft 10 is rotatably mounted inside the upper tank 1. The axial direction and rotational direction of this agitator shaft 10 are parallel to the axial direction (i.e., vertical direction) of the upper tank 1, and this agitator shaft 10 is driven by a rotational drive component 30 for rapidly rotating it. Furthermore, the bottom surface of the upper tank 1 has multiple discharge ports 11 arranged circumferentially, each of which communicates with the interior of the upper tank 1, and each discharge port 11 is connected to a gate assembly for controlling its open or closed state.

[0060] Multiple lower tanks 2 are positioned directly below multiple discharge ports 11, each with an open top, ensuring one-to-one communication between them. This allows material discharged from the discharge ports 11 to directly enter the corresponding lower tank 2. It should be noted that the upper surface of the lower tank 2 coincides with the lower surface of the upper tank 1 to prevent material from being discharged through the gap between them. Each lower tank 2 has a rotating agitator shaft 20 inside. By slowly rotating the agitator shaft 20, the material inside the lower tank 2 is disturbed, thus slowing down the segregation rate of the concrete.

[0061] The speed transmission structure 3 is mounted on the stirring shaft 10 and is connected to each stirring shaft 10 in a transmission manner, so that when the stirring shaft 10 rotates, the speed transmission structure 3 can drive the disturbance shaft 20 to rotate, and the speed of the disturbance shaft 20 is less than the speed of the stirring shaft 10.

[0062] In this embodiment, the upper tank 1 is used to stir the material; specifically, by adding the material to the upper tank 1 according to the original ratio, and by rotating the driving component 30 to drive the stirring shaft 10 to rotate, the material is uniformly mixed under the shear force generated by the high-speed rotation of the stirring shaft 10 to form concrete.

[0063] In addition, the lower tank 2 is used to agitate the concrete. Specifically, after the concrete is formed, the material can be discharged into the corresponding lower tank 2 through the corresponding discharge port 11 by opening the gate assembly. Subsequently, the agitation shaft 20 can agitate the concrete in the lower tank 2, so that the material remains active under the action of the force generated by the low-speed rotation of the agitation shaft 20. Specifically, it maintains the three-dimensional spatial distribution and avoids static stratification under the synergistic action of shear force, diffusion force and normal force, so as to suppress segregation.

[0064] The low-speed rotation of the disturbance shaft 20 and the high-speed rotation of the stirring shaft 10 are transmitted through the speed change transmission structure 3, so as to eliminate the need for drive components and reduce the production cost of the device.

[0065] The concrete mixing device provided in this embodiment, compared with the prior art, can simultaneously mix concrete and disturb the mixed concrete, thereby reducing concrete segregation and ensuring concrete supply to avoid adverse effects on construction efficiency.

[0066] In some embodiments, such as Figure 3 and Figure 10 As shown, the lower end of the stirring shaft 10 passes through the upper tank 1 and extends out, and each disturbance shaft 20 passes through the corresponding lower tank 2 and extends out.

[0067] Based on the foregoing, the transmission structure 3 includes a drive gear 31, multiple transmission rods 32, and multiple transmission belts 33.

[0068] The drive gear 31 is coaxially mounted on the extended portion of the stirring shaft 10.

[0069] Multiple transmission rods 32 are arranged around the driving gear 31 and correspond one-to-one with multiple disturbance shafts 20; the axial direction of each transmission rod 32 is parallel to the vertical direction, and a driven gear 321 that meshes with the driving gear 31 is coaxially connected to it.

[0070] Multiple transmission belts 33 are fitted one-to-one on multiple transmission rods 32, and each transmission belt 33 is also fitted around the outer periphery of the corresponding stirring shaft 10 so that when the transmission rod 32 rotates, the corresponding disturbance shaft 20 rotates synchronously.

[0071] In this embodiment, the transmission ratio between each set of driving gears 31 and driven gears 321 is greater than one, and / or the transmission ratio between the corresponding transmission rod 32 and stirring shaft 10 is greater than one; that is, it includes the following embodiments:

[0072] (a) The transmission ratio between the driving gear 31 and the driven gear 321 is greater than one, and the transmission ratio between the transmission rod 32 and the stirring shaft 10 is equal to one;

[0073] (ii) The transmission ratio between the driving gear 31 and the driven gear 321 is equal to one, and the transmission ratio between the transmission rod 32 and the stirring shaft 10 is greater than one;

[0074] (iii) The transmission ratio between the driving gear 31 and the driven gear 321 is greater than one, and the transmission ratio between the transmission rod 32 and the stirring shaft 10 is greater than one;

[0075] (iv) The transmission ratio between the driving gear 31 and the driven gear 321 is less than one, and the transmission ratio between the transmission rod 32 and the stirring shaft 10 is greater than one;

[0076] (v) The transmission ratio between the driving gear 31 and the driven gear 321 is greater than one, and the transmission ratio between the transmission rod 32 and the stirring shaft 10 is less than one;

[0077] It should be noted that, for embodiments (iv) and (v), the rotational speed of the disturbance shaft 20 is still less than that of the stirring shaft 10. This is achieved by reasonably designing the transmission ratio. Its beneficial effect is to give full play to the advantages of gear transmission or belt transmission and achieve a more stable transmission combination structure.

[0078] In some embodiments, such as Figure 3 and Figure 7 As shown, the upper tank 1 also includes a bracket 5 and a support plate 51.

[0079] The bracket 5 is installed on the upper tank 1 and is used to support it on the ground.

[0080] The support plate 51 is mounted on the bracket 5 and is located on the lower side of the upper tank 1.

[0081] Each lower tank 2 is mounted on a support plate 51, and each agitator shaft 20 passes through the support plate 51 and extends to the underside of the support plate 51. Each transmission rod 32 is rotatably connected to the support plate 51, and its lower end passes through the support plate 51 and extends to the underside of the support plate 51. Based on this, each transmission belt 33 is located on the underside of the support plate 51 and is fitted onto the extended portions of the corresponding agitator shaft 20 and transmission rod 32.

[0082] In some embodiments, such as Figure 3 As shown, each transmission rod 32 is disposed between the corresponding disturbance shaft 20 and stirring shaft 10; the bottom of the lower tank 2 has a protrusion 21 extending radially outward, and the extension direction of the protrusion 21 is all opposite to the corresponding transmission rod 32.

[0083] The interior of the protrusion 21 is connected to the interior of the lower tank 2. The protrusion 21 has a downwardly extending discharge pipe 22, and the discharge pipe 22 is connected to a valve body 221 for controlling the opening and closing of the pipe cavity.

[0084] In some embodiments, such as Figure 3 and Figure 5 As shown, the aforementioned discharge port 11 extends in a long strip along the radial direction of the upper tank 1, and the outer side of the upper tank 1 is provided with a plurality of guide grooves 12 that correspond one-to-one with the plurality of discharge ports 11.

[0085] Based on this, the gate assembly includes a baffle 4, which is slidably inserted into the guide groove 12 for moving to close the discharge port 11 to restrict the material from passing through the discharge port 11; the baffle 4 is also used to move to avoid the discharge port 11 so that the material in the upper tank 1 can be discharged through the discharge port 11.

[0086] In some embodiments, such as Figure 2 , Figure 5 and Figure 6 As shown, part of the baffle 4 is located outside the guide groove 12, and a swing arm 41 is hinged to the baffle 4 located outside the guide groove 12; the hinge axis of the swing arm 41 is parallel to the horizontal plane and perpendicular to the moving direction of the baffle 4.

[0087] The swing arm 41 has a sliding arm 42, which is slidably disposed along the length direction of the swing arm 41, and has an elastic reset member 6 between it and the swing arm 41.

[0088] By adopting the above technical solution, when the swing arm 41 swings to avoid the discharge port 11, the elastic reset member 6 is in a deformed state, so as to drive the sliding arm 42 to move relative to the swing arm 41, so that the swing arm 41 swings and drives the baffle 4 to move to the position of closing the discharge port 11.

[0089] In some embodiments, such as Figure 6 As shown, the swing end face of the swing arm 41 has a guide shaft 411 extending outward along its length direction, and the sliding arm 42 is disposed on the side facing the swing end of the swing arm 41, and has a mating groove 421 suitable for the guide shaft 411 to be inserted.

[0090] Based on the foregoing, the elastic reset member 6 is a spring sleeved on the guide shaft 411, and the two ends of the spring are respectively connected to the insertion end of the guide shaft 411 and the opening of the mating groove 421.

[0091] In some embodiments, such as Figure 3 and Figure 8 As shown, the stirring shaft 10 has multiple sets of straight rods 101 arranged in a spiral pattern along its axial direction. Each set of straight rods 101 includes two straight rods 101 spaced apart along the axial direction of the stirring shaft 10, and a side scraper 102 connecting the two straight rods 101 and used to fit against the inner circumferential surface of the upper tank 1.

[0092] By adopting the above technical solution, when the stirring shaft 10 rotates, the straight rod 101 can stir the material inside the upper tank 1, and the side scraper 102 can scrape the material on the inner side of the upper tank 1, thereby effectively stirring and mixing the materials evenly.

[0093] In some embodiments, such as Figure 3 and Figure 8 As shown, the inner bottom surface of the upper tank 1 has an upward convex structure, and each discharge port 11 is opened on the convex surface of the inner bottom surface of the upper tank 1 so that the material moves toward the outer edge of the upper tank 1.

[0094] The stirring shaft 10 has a lower scraper 103 extending radially outward. The bottom of the lower scraper 103 is in contact with the inner bottom surface of the upper tank 1. So when the stirring shaft 10 rotates, the lower scraper 103 can scrape the material on the inner bottom surface of the upper tank 1, avoiding the situation where the material accumulates and adheres to the inner bottom surface of the upper tank 1 and cannot enter the discharge port 11.

[0095] In some embodiments, such as Figure 3 and Figure 9 As shown, the disturbance shaft 20 has multiple sets of protruding rods 201 arranged at intervals along its axial direction. Each set of protruding rods 201 includes multiple protruding rods 201 arranged at intervals along the circumference of the disturbance shaft 20. In this embodiment, each set of protruding rods 201 includes four protruding rods 201, and the four protruding rods 201 are distributed at equal intervals, with the included angle between two adjacent protruding rods 201 being ninety degrees.

[0096] Each protruding rod 201 is connected to the outer peripheral surface of the disturbance shaft 20 and extends away from the disturbance shaft 20, so that when the disturbance shaft 20 rotates, the protruding rod 201 provides a force to the material in the lower tank 2.

[0097] The above content is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A concrete mixing device, characterized in that, include: The upper tank has a stirring shaft rotatably mounted inside it, and the stirring shaft is driven by a rotation drive component; the bottom surface of the upper tank has multiple discharge ports arranged circumferentially thereon, and each discharge port is connected to a gate assembly. Multiple lower tanks are arranged directly below the multiple discharge ports in a one-to-one correspondence. Each lower tank has an open top structure so that the multiple lower tanks are connected to the multiple discharge ports in a one-to-one correspondence. Each lower tank has a rotatable disturbance shaft inside. as well as A variable speed transmission structure is disposed on the stirring shaft and is connected to each of the stirring shafts so that when the stirring shaft rotates, the variable speed transmission structure can drive the disturbance shaft to rotate, and the rotational speed of the disturbance shaft is less than the rotational speed of the stirring shaft.

2. The concrete mixing device as described in claim 1, characterized in that, The lower end of the stirring shaft passes through the upper tank and extends out, and each of the disturbance shafts passes through the corresponding lower tank and extends out. The speed transmission structure includes: The drive gear is coaxially disposed on the extended portion of the stirring shaft; Multiple transmission rods are arranged around the driving gear and correspond one-to-one with multiple disturbance shafts; the axial direction of each transmission rod is parallel to the vertical direction, and a driven gear meshing with the driving gear is coaxially connected to it; and Multiple transmission belts are fitted one-to-one on multiple transmission rods, and each transmission belt is also fitted on the outer periphery of the corresponding stirring shaft so that when the transmission rod rotates, the corresponding disturbance shaft rotates synchronously. In each group, the transmission ratio between the driving gear and the driven gear is greater than one, and / or the corresponding transmission ratio between the transmission rod and the stirring shaft is greater than one.

3. The concrete mixing device as described in claim 2, characterized in that, The upper tank also includes: A bracket, mounted on the upper tank, is used to support the tank on the ground; and A support plate is mounted on the bracket and located on the lower side of the upper tank. Each of the lower tanks is mounted on the support plate, and each of the disturbance shafts passes through the support plate and extends to the underside of the support plate. Each of the transmission rods is rotatably connected to the support plate, and its lower end passes through the support plate and extends to the underside of the support plate; Each of the transmission belts is disposed on the underside of the support plate and is fitted onto the protruding portion of the corresponding disturbance shaft and transmission rod.

4. The concrete mixing device as described in claim 2, characterized in that, The transmission rod is disposed between the corresponding disturbance shaft and the stirring shaft; the bottom of the lower tank has a protrusion extending radially outward, and the extension direction of the protrusion is opposite to the corresponding transmission rod. The interior of the protrusion is connected to the interior of the lower tank. The protrusion has a downwardly extending discharge pipe, and a valve body is connected to the discharge pipe.

5. The concrete mixing device as described in claim 1, characterized in that, The discharge port extends radially along the upper tank body, and the outer surface of the upper tank body has multiple guide grooves that correspond one-to-one with the multiple discharge ports; the gate assembly includes: A baffle is slidably inserted into the guide groove for moving to close the discharge port to restrict material from passing through the discharge port; the baffle is also used to move to avoid the discharge port so that material in the upper tank can be discharged through the discharge port.

6. The concrete mixing device as described in claim 5, characterized in that, Part of the baffle is located outside the guide groove, and a swing arm is hinged to the baffle located outside the guide groove; the hinge axis of the swing arm is parallel to the horizontal plane and perpendicular to the moving direction of the baffle. The swing arm has a sliding arm, which is slidably disposed along the length direction of the swing arm and has an elastic reset member between it and the swing arm; When the swing arm swings to avoid the discharge port, the elastic reset member is in a deformed state to drive the sliding arm to move relative to the swing arm, so that the swing arm swings and drives the baffle to move to the position of closing the discharge port.

7. The concrete mixing device as described in claim 6, characterized in that, The swing end face of the swing arm has a guide shaft extending outward along its length direction, and the sliding arm is disposed on the side facing the swing end of the swing arm, and has a mating groove suitable for the insertion of the guide shaft. The elastic reset component is a spring sleeved on the guide shaft, and the two ends of the spring are respectively connected to the insertion end of the guide shaft and the opening of the mating groove.

8. The concrete mixing device as described in claim 1, characterized in that, The stirring shaft has multiple sets of straight rods arranged spirally at intervals along its axial direction. Each set of straight rods includes two straight rods spaced apart along the axial direction of the stirring shaft, and a side scraper connecting the two straight rods for fitting against the inner circumferential surface of the upper tank.

9. The concrete mixing device as described in claim 1 or 8, characterized in that, The inner bottom surface of the upper tank has an upward convex structure, and each of the discharge ports is opened on the convex surface of the inner bottom surface of the upper tank. The stirring shaft has a lower scraper extending radially outward, the bottom of which is in contact with the inner bottom surface of the upper tank.

10. The concrete mixing device as described in claim 1, characterized in that, The disturbance shaft has multiple sets of protrusions arranged at intervals along its axial direction, and each set of protrusions includes multiple protrusions arranged at intervals along the circumference of the disturbance shaft; Each of the protruding rods is connected to the outer peripheral surface of the disturbance shaft and extends away from the disturbance shaft, so that when the disturbance shaft rotates, the protruding rod provides a force to the material in the lower tank.

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