A compact concrete preparation mixing apparatus and a mixing method thereof

Abstract

The application relates to the technical field of cement mixing equipment, and discloses a mixing equipment for dense concrete preparation and a mixing method thereof, which comprises a mixing shaft, a vibration roller capable of rolling along the inner wall of the mixing shaft is arranged in the mixing shaft, a transmission assembly is connected to the vibration roller, the transmission assembly comprises two groups of eccentric shaft sleeves, the two groups of eccentric shaft sleeves are arranged at the two ends of the mixing shaft, the vibration roller is located in the middle of the two groups of eccentric shaft sleeves, the two groups of eccentric shaft sleeves are connected with the rotating shaft of the vibration roller through transmission rods, and the transmission rods can be bent. The application has the mixing equipment for dense concrete preparation and the mixing method thereof. The mixing equipment for dense concrete preparation and the mixing method thereof utilize the high-speed rolling of the vibration roller in the mixing shaft to generate vibration, the rotating shaft in the mixing shaft is subjected to smaller counterforce, meanwhile, the eccentric shaft sleeves are subjected to smaller counterforce from the vibration roller, and the service life of the vibration-related structure is improved as well as the bearing vibration intensity and vibration amplitude.

Description

Technical Field

[0001] This application relates to the field of cement mixing equipment technology, and in particular to a mixing device and mixing method for preparing dense concrete. Background Technology

[0002] Vibratory mixing disrupts the water film on the aggregate surface, breaking up agglomerated cement particles, allowing for more complete cement hydration, increasing the excess paste thickness on the aggregate surface, improving lubrication, reducing yield strength, and facilitating flow between aggregates. This increases the excess paste thickness, thereby lowering the yield strength and enhancing the workability of self-compacting concrete.

[0003] During vibration mixing, the mixing shaft of the mixer can vibrate at high frequency. This vibration is transmitted to the mixing arms and mixing blades through the mixing shaft, thereby achieving an effective combination of macroscopic convection and microscopic diffusion, making the concrete microscopically uniform. The vibration force of the mixing shaft can be generated in various ways, but ultimately it is transmitted to the mixing shaft through the vibration shaft. There is a bearing between the vibration shaft and the mixing shaft. During vibration mixing, the reaction force of the mixing shaft will act on the bearing, reducing the service life of the bearing. In order to ensure the service life of the bearing, it is necessary to limit the intensity and amplitude of vibration, which restricts the effectiveness of vibration mixing.

[0004] Secondly, when a vibration source is set only at one end of the mixing shaft, the vibration energy gradually weakens from the vibrating end to the fixed end, which will lead to uneven mixing of concrete. When vibration sources are set at both ends of the mixing shaft, the vibration at both ends may be asynchronous, resulting in a spiral vibration phenomenon. That is, the vibration directions at both ends are different, affecting each other, reducing the intensity of vibration, and reducing the service life of the bearing. Summary of the Invention

[0005] This application proposes a mixing device and mixing method for preparing dense concrete. It utilizes the high-speed rolling of a vibrating roller inside the mixing shaft to generate vibration, thereby avoiding the concentration of force on the bearing, improving the service life of vibration-related structures, and enabling it to withstand greater vibration force and amplitude, thus enhancing the efficiency of vibration mixing.

[0006] To achieve the above objectives, this application adopts the following technical solution: a mixing device for preparing dense concrete, comprising a vibrating platform, a mixing box on the vibrating platform, a mixing shaft inside the mixing box, a plurality of mixing blades on the mixing shaft, a mixing motor drivenly connected to one end of the mixing shaft, the mixing shaft being hollow, and a vibrating roller capable of rolling along the inner wall of the mixing shaft inside the mixing shaft, the vibrating roller being connected to a transmission assembly, the transmission assembly comprising two sets of eccentric bushings, the two sets of eccentric bushings being respectively disposed at both ends of the mixing shaft, the vibrating roller being located in the middle of the two sets of eccentric bushings, a rotating shaft being disposed at the axis of the vibrating roller, both sets of eccentric bushings being connected to the rotating shaft of the vibrating roller through a transmission rod, the transmission rod being bendable, the length of the transmission rod being longer than the distance from the eccentric bushing to the vibrating roller, ensuring that the vibrating roller can move along the inner wall of the mixing shaft, and at least one side of the eccentric bushing being drivenly connected to the vibrating motor through the transmission shaft.

[0007] Furthermore, both sides of the eccentric bushing are equipped with a vibration motor, and the vibration motors on both sides rotate at the same speed.

[0008] Furthermore, the vibrating roller includes a roller body, and a positioning structure is provided in the middle of the roller body. The positioning structure includes a positioning cone surface, and the diameter of the positioning cone surface gradually increases from the middle to both sides. The inner wall of the stirring shaft is provided with a limiting cone surface corresponding to the positioning cone surface, and a gap is left between the limiting cone surface and the positioning cone surface.

[0009] Furthermore, the outer diameter of the roller body is smaller than the minimum inner diameter of the stirring shaft.

[0010] Furthermore, the stirring shaft is configured as three sections, namely a first shaft cylinder, a connecting shaft cylinder, and a second shaft cylinder. Both the first and second shaft cylinders are connected to the connecting shaft cylinder via flanges. The limiting cone surface is located on the connecting shaft cylinder, which facilitates the maintenance and upkeep of the vibrating roller. The other ends of both the first and second shaft cylinders are connected to the mixing box via external bearings.

[0011] Furthermore, the eccentric bushing consists of two parts: a concentric bushing and an eccentric bushing. The concentric bushing is fixedly connected to the transmission shaft, and the transmission rod is fixedly connected to the eccentric bushing. The concentric bushing is connected to the stirring shaft through an inner bearing.

[0012] Furthermore, two sets of stirring shafts, vibrating rollers, and transmission components are arranged in parallel inside the mixing tank. The transmission shaft is fixedly connected to a driven gear, and the vibrating motor is driven by a driving gear. The two driven gears on the same side mesh with the same driving gear, so that the eccentric positions of the two sets of eccentric bushings are always consistent.

[0013] Furthermore, it also includes an equipment platform that is not in contact with the vibration platform. The equipment platform is used to install the stirring motor and the vibration motor, as well as the corresponding supporting components. The stirring motor and the stirring shaft are connected by a flexible coupling.

[0014] A mixing method for preparing dense concrete, wherein the dense concrete is mixed using the aforementioned mixing equipment for preparing dense concrete.

[0015] The beneficial effects of this invention are: This application provides a mixing device and method for preparing dense concrete. It utilizes the high-speed rolling of a vibrating roller inside a mixing shaft to generate vibration. On the one hand, the reaction force between the mixing shaft and the vibrating roller acts directly on the outer wall of the roller body, while the reaction force on the internal rotating shaft is relatively small. On the other hand, since the eccentric bushing drives the vibrating roller through a bendable transmission rod, the reaction force on the eccentric bushing from the vibrating roller is also relatively small. Therefore, the vibration-related structure in this application has a longer service life, is more reliable, and can withstand greater vibration force and amplitude, thus enhancing the effectiveness of vibration mixing.

[0016] Since the vibration is generated by the rolling of the vibrating roller in the middle of the stirring shaft, the vibration force on the vibrating stirring shaft is relatively uniform, which can achieve a better mixing effect. At the same time, the vibration sources will not affect each other, further ensuring the vibration intensity. Attached Figure Description

[0017] The accompanying drawings, which form part of this specification, illustrate embodiments disclosed in this application and, together with the specification, serve to explain the principles of the embodiments disclosed in this application.

[0018] Referring to the accompanying drawings and the following detailed description, the embodiments disclosed in this application can be understood more clearly, wherein: Figure 1 This is a three-dimensional schematic diagram of the present invention; Figure 2 This is a top view of the present invention; Figure 3 This is a cross-sectional view of the stirring shaft in this invention; Figure 4 This is a schematic diagram of the eccentric bushing in this invention.

[0019] In the diagram: 1. Equipment platform; 2. Vibrating platform; 3. Mixing tank; 4. Mixing shaft; 41. First shaft cylinder; 42. Connecting shaft cylinder; 43. Second shaft cylinder; 5. Mixing blade; 6. Mixing motor; 7. Vibrating roller; 71. Roller body; 72. Limiting cone surface; 73. Positioning cone surface; 8. Transmission assembly; 81. Driven gear; 82. Drive gear; 83. Transmission shaft; 84. Transmission rod; 85. Eccentric bushing; 851. Concentric sleeve; 852. Eccentric sleeve; 86. Inner bearing; 9. Vibrating motor; 10. Discharge port; 11. Outer bearing. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application. Example

[0021] Please see Figures 1-3A mixing device for preparing dense concrete is a twin-shaft vibrating mixer, comprising a vibrating platform 2, a mixing chamber 3 mounted on the vibrating platform 2, two sets of mixing shafts 4 arranged in parallel inside the mixing chamber 3, and multiple mixing blades 5 evenly distributed on the outer side wall of the mixing shafts 4. A mixing motor 6 is drivenly connected to one end of the mixing shafts 4, and a reducer is provided between the mixing motor 6 and the mixing shafts 4. The reducer is connected to the mixing shafts 4 via a flexible coupling to isolate the vibration of the mixing shafts 4. The machine 6 drives the mixing blades 5 to rotate, mixing the concrete in the mixing tank 3. The mixing shaft 4 is hollow, and a vibrating roller 7 that can roll along the inner wall of the mixing shaft 4 is installed inside the mixing shaft 4. The vibrating roller 7 is connected to a transmission assembly 8, which drives the vibrating roller 7 to roll along the inner wall of the mixing shaft 4. The transmission assembly 8 includes two sets of eccentric bushings 85, which are located at both ends of the mixing shaft 4. The vibrating roller 7 is located in the middle of the two sets of eccentric bushings 85. A rotating shaft is provided at the axis of the vibrating roller 7. Both are connected to the rotating shaft of the vibrating roller 7 via transmission rods 84. The transmission rods 84 are locked onto the eccentric bushings 85 by nuts. At least one side of the eccentric bushing 85 is connected to the vibrating motor 9 via a transmission shaft 83. The eccentric bushing 85 can be located inside or outside the stirring shaft 4. In this embodiment, the eccentric bushing 85 is located inside the stirring shaft 4 and is connected to the stirring shaft 4 via an inner bearing 86. Vibrating motors 9 are provided on both sides, and the vibration motors 9 on both sides rotate at the same speed, making the vibrating roller 7 move more smoothly. To ensure smooth operation, the transmission rod 84 can bend. The length of the transmission rod 84 is slightly longer than the distance from the eccentric bushing 85 to the vibrating roller 7, ensuring that the vibrating roller 7 can move along the inner wall of the stirring shaft 4. When the eccentric bushing 85 rotates, it drives the end of the transmission rod 84 to make a circular motion. The ends of both sets of transmission rods 84 make circular motions at the same time, like jumping rope. The middle of the two sets of transmission rods 84 begins to oscillate, that is, the vibrating roller 7 makes a circular motion. When the vibrating roller 7 makes a circular motion, it rolls on the inner wall of the stirring shaft 4, realizing the high-frequency vibration of the stirring shaft 4. During this process, the outer wall of the vibrating roller 7 is in direct contact with the mixing shaft 4. The reaction force of the vibrating roller 7 on the mixing shaft 4 is borne by the outer wall of the vibrating roller 7, while the reaction force on its internal rotating shaft is smaller. The vibrating roller 7 can bear a larger force. At the same time, since the contact position is located on the outer wall, the heat dissipation area is larger, which can achieve better heat dissipation. Therefore, it can achieve greater vibration intensity and longer service life. Secondly, the vibrating roller 7 vibrates in the middle of the mixing shaft 4, and the vibration force is more uniform. The side of the mixing tank 3 closest to the mixing motor 6 is the feed port, and the proportioned concrete is poured into the mixing tank 3 from here. The other side is equipped with an outer bearing 11, and the mixed concrete is discharged from here.

[0022] The vibrating roller 7 includes a roller body 71. A positioning structure is provided in the middle of the roller body 71. The positioning structure includes a positioning cone surface 73. The diameter of the positioning cone surface 73 gradually increases from the middle to both sides. The inner wall of the stirring shaft 4 is provided with a limiting cone surface 72 corresponding to the positioning cone surface 73. There is a gap between the limiting cone surface 72 and the positioning cone surface 73. When the vibrating roller 7 moves axially, the positioning cone surface 73 will roll on the limiting cone surface 72. The interaction force between the two will push the vibrating roller 7 back. The outer diameter of the roller body 71 is smaller than the minimum inner diameter of the stirring shaft 4, which facilitates the installation of the vibrating roller 7.

[0023] The stirring shaft 4 is divided into three sections: a first shaft cylinder 41, a connecting shaft cylinder 42, and a second shaft cylinder 43. Both the first shaft cylinder 41 and the second shaft cylinder 43 are connected to the connecting shaft cylinder 42 via flanges. The limiting cone surface 72 is located on the connecting shaft cylinder 42, which facilitates the maintenance and upkeep of the vibrating roller 7. The other end of the first shaft cylinder 41 and the second shaft cylinder 43 are connected to the mixing box 3 via an outer bearing 11.

[0024] Please see Figure 3 and Figure 4 The eccentric bushing 85 consists of two parts: a concentric bushing 851 and an eccentric bushing 852. The concentric bushing 851 is fixedly connected to the drive shaft 83, and the concentric bushing 851 and the drive shaft 83 are locked by a nut. The drive rod 84 is fixedly connected to the eccentric bushing 852, and the drive rod 84 and the concentric bushing 851 are locked by a nut. The concentric bushing 851 is connected to the stirring shaft 4 through an inner bearing 86. Under the action of the drive shaft 83, the concentric bushing 851 rotates, which at the same time drives the end of the drive rod 84 to make a circular motion.

[0025] Please see Figure 2 and Figure 3 The drive shaft 83 is fixedly connected to the driven gear 81, and the vibration motor 9 is driven by the drive gear 82. The two driven gears 81 on the same side mesh with the same drive gear 82, so that the eccentric position of the eccentric bushing 85 is always consistent. That is, the initial eccentric angle of the corresponding eccentric bushing 85 is the same, and the subsequent rotation angle is the same, thereby ensuring that the vibration of the two mixing shafts 4 is consistent, making the vibration of the concrete more uniform.

[0026] The vibrating platform 2 is equipped with an equipment platform 1 on its outer side. The equipment platform 1 does not contact the vibrating platform 2 and does not vibrate. The equipment platform 1 is used to install the stirring motor 6 and the vibrating motor 9, as well as the matching weighing components and dust removal components.

[0027] When mixing concrete, the mixing shaft 4 rotates to mix the concrete. At the same time, the vibrating motor 9 drives the eccentric bushing 85 to rotate. When the eccentric bushing 85 rotates, the end of the transmission rod 84 rotates in a circular motion. The transmission rod 84 transmits the revolution to the vibrating roller 7, causing the vibrating roller 7 to roll at high speed along the inside of the mixing shaft 4, forming high-frequency vibration. Conversely, due to the bending of the transmission rod 84, the reaction force transmitted from the vibrating roller 7 to the eccentric bushing 85 is small. At the same time, since the force between the vibrating roller 7 and the mixing shaft 4 is applied to the outer wall of the roller body 71, the reaction force on the rotating shaft is small.

Claims

1. A mixing device for preparing dense concrete, comprising a vibrating platform (2), a mixing box (3) provided on the vibrating platform (2), a mixing shaft (4) provided inside the mixing box (3), a plurality of mixing blades (5) provided on the mixing shaft (4), and a mixing motor (6) connected to one end of the mixing shaft (4), characterized in that, The stirring shaft (4) is hollow and a vibrating roller (7) that can roll along the inner wall of the stirring shaft (4) is provided inside the stirring shaft (4). The vibrating roller (7) is connected to a transmission assembly (8). The transmission assembly (8) includes two sets of eccentric bushings (85). The two sets of eccentric bushings (85) are respectively located at both ends of the stirring shaft (4). The vibrating roller (7) is located in the middle of the two sets of eccentric bushings (85). A rotating shaft is provided at the axis of the vibrating roller (7). Both sets of eccentric bushings (85) are connected to the rotating shaft of the vibrating roller (7) through a transmission rod (84). The transmission rod (84) can be bent. The length of the transmission rod (84) is longer than the distance from the eccentric bushing (85) to the vibrating roller (7) to ensure that the vibrating roller (7) can move along the inner wall of the stirring shaft (4). At least one side of the eccentric bushing (85) is connected to the vibration motor (9) through the transmission shaft (83). The vibrating roller (7) includes a roller body (71), and a positioning structure is provided in the middle of the roller body (71). The positioning structure includes a positioning cone surface (73). The diameter of the positioning cone surface (73) gradually increases from the middle to both sides. The inner wall of the stirring shaft (4) is provided with a limiting cone surface (72) corresponding to the positioning cone surface (73). There is a gap between the limiting cone surface (72) and the positioning cone surface (73).

2. The mixing equipment for preparing dense concrete according to claim 1, characterized in that, Both sides of the eccentric bushing (85) are equipped with a vibration motor (9), and the vibration motors (9) on both sides have the same speed.

3. The mixing equipment for preparing dense concrete according to claim 1, characterized in that, The outer diameter of the roller (71) is smaller than the minimum inner diameter of the stirring shaft (4).

4. The mixing equipment for preparing dense concrete according to claim 1, characterized in that, The stirring shaft (4) is provided with a detachable connecting shaft cylinder (42) in the middle, and the limiting cone surface (72) is located on the connecting shaft cylinder (42).

5. A mixing device for preparing dense concrete according to claim 2, characterized in that, The eccentric bushing (85) consists of two parts: a concentric bushing (851) and an eccentric bushing (852). The concentric bushing (851) is fixedly connected to the transmission shaft (83), and the transmission rod (84) is fixedly connected to the eccentric bushing (852). The concentric bushing (851) is connected to the stirring shaft (4) through an inner bearing (86).

6. The mixing equipment for preparing dense concrete according to claim 5, characterized in that, The mixing tank (3) is provided with two sets of mixing shafts (4), vibrating rollers (7) and transmission components (8) arranged in parallel. The transmission shaft (83) is fixedly connected to a driven gear (81), and the vibrating motor (9) is connected to a driving gear (82). The two driven gears (81) on the same side are meshed with the same driving gear (82), so that the eccentric position of the two sets of eccentric bushings (85) is always consistent.

7. A mixing device for preparing dense concrete according to claim 6, characterized in that, It also includes an equipment platform (1), which is not in contact with the vibration platform (2). The equipment platform (1) is used to install the stirring motor (6) and the vibration motor (9) and the corresponding supporting components. The stirring motor (6) and the stirring shaft (4) are connected by a flexible coupling.

8. A mixing method for preparing dense concrete, characterized in that, The dense concrete is mixed using a mixing device for preparing dense concrete as described in any one of claims 1-7.

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