A small multifunctional concrete mixing plant

Abstract

This invention discloses a small, multi-functional concrete mixing plant, belonging to the field of concrete engineering construction technology. It includes a main frame, a mixing chamber, and an inclined belt conveyor. A rotating column is installed inside the mixing chamber, with a lead screw rotatably connected inside. A slider is fitted onto the lead screw, and the top of the lead screw is fixed to an L-shaped frame. A power unit is installed on the top of the mixing chamber. The rotating column is fitted with two annular outer shells. Connector 1 and connector 2 are fixed to the slider. Connector 1 is fixedly connected to annular outer shell 1, and connector 2 is rotatably connected to the inner ring of a cross-shaped structure. The protruding part of the cross-shaped structure is slidably connected to the inner wall of the mixing chamber. An annular outer shell 1 has a mixing structure on its outer ring, and an annular outer shell 2 has a rotating guide groove that allows the mixing structure to rotate. An automatically opening and closing circular baffle is located above annular outer shell 2. This invention allows the mixing structure to mix concrete of different heights. The rotating guide groove allows the mixing structure to rotate, avoiding dead zones, and the circular baffle accelerates concrete discharge.

Description

Technical Field

[0001] This invention relates to the field of concrete engineering construction technology, and in particular to a small-scale multifunctional concrete mixing plant. Background Technology

[0002] Concrete mixing equipment plays a vital role in concrete engineering construction, effectively mixing raw materials such as cement, sand, gravel, and water into uniform concrete to ensure the quality and strength of building structures. Traditional concrete mixing equipment mainly includes mixers and batching plants. Although these devices can meet the basic concrete mixing needs, there are still some technical limitations and challenges in their use.

[0003] First, traditional concrete mixing equipment typically uses a fixed or semi-fixed mixing structure, which can only perform mixing operations within a certain range. It is difficult to effectively mix concrete at different heights within the mixing tank, resulting in uneven mixing and affecting the quality of the concrete. In addition, the mixing structure is prone to creating dead zones during the mixing process, causing some concrete to fail to be fully mixed, further reducing the mixing effect.

[0004] Secondly, traditional mixing equipment often relies on gravity for material discharge, resulting in slow discharge speed and a tendency to cause concrete blockage, affecting construction progress and efficiency. This is especially true in large-scale construction projects, where timely and rapid delivery of concrete is crucial. Therefore, improving the efficiency of concrete mixing and discharge has become an urgent problem to be solved. Summary of the Invention

[0005] The purpose of this invention is to solve the problems of mixing uniformity and discharge efficiency of traditional mixing equipment through innovative design.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a small multi-functional concrete mixing plant, comprising a main frame and a mixing tank and an inclined belt conveyor installed on the main frame, wherein a conveyor vehicle is provided on one side of the mixing tank and an aggregate storage bin is provided on the other side of the inclined belt conveyor.

[0007] The mixing tank is equipped with a rotating column inside, and a lead screw is rotatably connected inside the rotating column. A slider is threaded on the outer ring of the lead screw. The top of the lead screw is fixedly connected to an L-shaped frame at the top of the mixing tank. A power device for driving the rotating column to rotate is installed at the top of the mixing tank.

[0008] The rotating column is fitted with an annular outer shell 1 and an annular outer shell 2. Connector 1 and connector 2 are fixed on the slider and pass through the rotating column. Connector 1 is fixedly connected to the inner ring of annular outer shell 1, and connector 2 is rotatably connected to the inner ring of cross. The protruding part of cross passes through annular outer shell 2 and is slidably connected to the inner wall of the mixing tank.

[0009] The outer ring of the first annular shell is provided with several stirring structures. The part of the second annular shell that penetrates the inner cavity of the first annular shell is provided with a rotating guide groove that allows the stirring structures to rotate. A circular baffle that can open and close automatically is arranged on the top of the second annular shell.

[0010] As a further description of the above technical solution: the bottom of the mixing tank is provided with a discharge pipe that penetrates the main frame, the top of the mixing tank is provided with a feed pipe that works in conjunction with the inclined belt conveyor, the top of the rotating column penetrates the mixing tank, the bottom of the rotating column is rotatably connected to the four corner frames, and the four corner frames are fixedly connected to the bottom wall of the inner cavity of the mixing tank.

[0011] As a further description of the above technical solution: the power device includes a motor and a pulley 1 fixedly sleeved on the output end of the motor, a pulley 2 sleeved on the outer ring of the rotating column, and a transmission belt sleeved on the outer ring of pulley 1 and pulley 2, and the output end of the motor is rotatably connected to the top of the mixing tank.

[0012] As a further description of the above technical solution: both the upper and lower sides of the slider are fixed with telescopic hoses sleeved on the outer ring of the lead screw, and the ends of the two telescopic hoses away from the slider are fixedly connected to the inner cavity of the rotating column. The second annular outer shell is set on the top of the first annular outer shell.

[0013] As a further description of the above technical solution: the stirring structure includes a rectangular plate disposed in the inner cavity of the annular outer shell, a slide rod that is slidably connected to the rotating guide groove is fixed on the side of the rectangular plate near the annular outer shell, and a stirring rod that penetrates the annular outer shell is fixed on the side of the rectangular plate away from the slide rod.

[0014] As a further description of the above technical solution: the circular baffle includes a baffle one and a baffle two with an opening. The bottom of the baffle one is fixedly connected to the top of the cross, the baffle two is rotatably connected to the annular outer shell two, and an automatic opening and closing device is fixed to the top of the baffle two.

[0015] As a further description of the above technical solution: the automatic opening and closing device includes a protective shell, which is sleeved on the outer ring of the rotating column and fixedly connected to the baffle plate 2. A plurality of inclined blocks 1 are provided on the side of the inner cavity of the protective shell away from the rotating column. The bottom of the inclined block 1 is provided with a limiting post that penetrates the protective shell. The limiting post extends to the opening of the baffle plate 1 and the baffle plate 2. The outer ring of the limiting post is sleeved with springs at both ends that are fixed to the protective shell and the inclined block 1 respectively.

[0016] As a further description of the above technical solution: The top of the inclined block one is provided with an inclined block two that cooperates with the inclined block one, and an electric telescopic rod one that is fixed to the inner wall of the protective shell is fixed on the side of the inclined block two near the rotating column.

[0017] For a further description of the above technical solution: an electric telescopic rod two is fixed on the side of the protective shell away from the rotating column, and a limit rod is fixed at the output end of the electric telescopic rod two. The limit rod passes through the protective shell and is engaged with the rotating column.

[0018] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows: a lead screw is rotatably connected inside the rotating column, and the other end of the lead screw is fixedly connected to an L-shaped frame. A slider is threaded on the outer ring of the lead screw, and a connecting piece 1 and a connecting piece 2 are provided on the slider that penetrate the rotating column. This design allows the slider to move up and down along the lead screw through the synergistic action of the above components when the rotating column rotates. This allows several stirring structures on the outer ring of the annular shell to move up and down inside the mixing chamber, so as to stir concrete at different heights inside the mixing chamber.

[0019] The rotating column is enclosed by two annular shells, a first and a second. The slider is connected to the first annular shell via a connector, and the slider is fitted with a second connector, which is rotatably connected to the inner ring of the cross. The protruding part of the cross penetrates the second annular shell and is slidably connected to the inner wall of the mixing tank. The rotation of the slider can drive the first annular shell to rotate and move up and down, while the second annular shell can only move up and down and cannot rotate. Furthermore, the part of the second annular shell located inside the cavity of the first annular shell is also equipped with a rotating guide groove. The rotating guide groove works in conjunction with the mixing structure. When the first annular shell drives the mixing structure to rotate, the rotating guide groove can cause the mixing structure to rotate, which can more effectively mix concrete and avoid dead corners. The connection between the rotating guide groove and the mixing structure is located inside the cavity of the first annular shell, which can effectively prevent concrete from clogging the rotating guide groove.

[0020] An automatically opening and closing circular baffle is installed above the second annular shell. After the concrete is mixed, the circular baffle is closed, and the second annular shell is driven by a slider, which in turn drives the circular baffle to descend. The circular baffle can squeeze the concrete in the mixing tank toward the discharge pipe, which can accelerate the discharge of concrete and improve work efficiency. Attached Figure Description

[0021] Figure 1 A perspective view of the present invention is shown;

[0022] Figure 2 A perspective view showing the connection relationship between the mixing tank body and the power unit of the present invention is shown;

[0023] Figure 3 A cross-sectional perspective view of the mixing tank body of the present invention is shown;

[0024] Figure 4 The present invention is shown. Figure 3 Enlarged view of point A in the middle;

[0025] Figure 5A perspective view showing the connection relationship between the rotating column of the present invention and the annular outer shell one and the annular outer shell two is shown;

[0026] Figure 6 A perspective view and a perspective sectional view of the rotating column of the present invention are shown;

[0027] Figure 7 The present invention is shown. Figure 6 Enlarged view of point B in the middle;

[0028] Figure 8 A perspective view showing the connection relationship between connector one and annular outer shell one and connector two and cross-shaped part of the present invention is shown;

[0029] Figure 9 A perspective view of the second annular outer shell of the present invention is shown;

[0030] Figure 10 A perspective view showing the connection relationship between the stirring structure and the annular outer shell of the present invention is shown;

[0031] Figure 11 The present invention is shown. Figure 10 Enlarged view of point C in the middle;

[0032] Figure 12 A perspective view of the cross of the present invention is shown;

[0033] Figure 13 A perspective view showing the connection relationship between the slider of the present invention and connector one and connector two is shown;

[0034] Figure 14 A partial perspective view of the automatic opening and closing device of the present invention is shown;

[0035] Figure 15 The present invention is shown. Figure 14 Enlarged view at point D;

[0036] Figure 16 A perspective view of the limiting post of the present invention extending to the openings of baffle one and baffle two is shown;

[0037] Figure 17 A top plan view of the automatic opening and closing device of the present invention is shown;

[0038] Figure 18 A perspective view of the first baffle and the second baffle of the present invention is shown;

[0039] Figure 19 A perspective view of the present invention showing that the second baffle of the present invention blocks the opening of the first baffle.

[0040] Legend:

[0041] 10. Main frame; 11. Mixing tank body; 111. Discharge pipe; 112. Feed pipe; 12. Inclined belt conveyor; 13. Conveyor vehicle; 14. Aggregate storage bin; 15. L-shaped frame; 16. Four-corner frame;

[0042] 20. Rotating column; 21. Lead screw; 22. Slider; 221. Connector 1; 222. Connector 2; 223. Cross; 24. Telescopic hose;

[0043] 30. Power unit; 31. Electric motor; 32. Pulley 1; 33. Pulley 2; 34. Drive belt;

[0044] 40. Annular outer shell one; 41. Annular outer shell two; 411. Rotary guide groove;

[0045] 50. Stirring structure; 51. Rectangular plate; 52. Slide bar; 53. Stirring rod;

[0046] 60. Circular baffle; 61. Baffle one; 62. Baffle two;

[0047] 70. Automatic opening and closing device; 71. Protective housing; 72. Inclined block one; 73. Limiting post; 74. Spring; 75. Inclined block two; 76. Electric telescopic rod one; 77. Electric telescopic rod two; 78. Limiting rod. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] Please see Figures 1-19 A small, multi-functional concrete mixing plant includes a main frame 10, a mixing tank 11, and an inclined belt conveyor 12 installed on top of the main frame 10. The main frame 10 provides a stable support structure to ensure the stability of the entire concrete mixing plant and facilitates the installation of other components. The mixing tank 11, as the main container for concrete mixing, ensures that the concrete raw materials are uniformly mixed in a closed environment to prevent external contamination. A conveyor 13 is equipped on one side of the mixing tank 11, while an aggregate storage bin 14 is equipped on the other side of the inclined belt conveyor 12. The inclined belt conveyor 12 is used to transport raw materials from the aggregate storage bin 14 to the mixing tank 11, reducing the labor intensity of manual handling and improving work efficiency. The conveyor 13 is used to transport the mixed concrete, facilitating the transport of concrete from the mixing plant to the construction site. The aggregate storage bin 14 is used to store and pre-process aggregates to ensure continuous material supply and improve production efficiency.

[0050] The power unit 30 provides driving force to control the rotation of the rotating column 20, realizing the functions of mixing and accelerating concrete discharge, and improving the working efficiency of the equipment. The rotating column 20 is rotatably connected to a lead screw 21, and the other end of the lead screw 21 is fixedly connected to the L-shaped frame 15. The outer ring of the lead screw 21 is threaded with a slider 22, and the slider 22 is provided with a connecting part 1 221 and a connecting part 222 that pass through the rotating column 20. When the rotating column 20 rotates, the slider 22 can be driven to rotate along the outer ring of the lead screw 21 through the connecting part 1 221 and the connecting part 222, thereby realizing the up and down movement of the slider 22 on the outer ring of the lead screw 21.

[0051] The outer ring of the rotating column 20 is fitted with an annular outer shell 40 and an annular outer shell 41. The connecting piece 221 is fixedly connected to the annular outer shell 40. When the slider 22 rotates, it can drive the annular outer shell 40 to rotate. And because the slider 22 moves up and down when it rotates, the annular outer shell 40 will also move up and down with the slider 22.

[0052] Connector 222 is rotatably connected to the inner ring of cross 223. The protruding part of cross 223 passes through the annular outer shell 41 and is slidably connected to the inner wall of the mixing tank 11. When slider 22 drives connector 222 to rotate, connector 222 slides in the inner ring of cross 223 and does not drive the annular outer shell 41 to rotate. Since the protruding part of cross 223 passes through the annular outer shell 41 and is slidably connected to the inner wall of the mixing tank 11, connector 222 can drive the annular outer shell 41 to move up and down through cross 223.

[0053] The outer ring of the annular shell 40 is provided with several mixing structures 50. When the power device 30 drives the rotating column 20 to rotate, the rotating column 20 drives the slider 22 to rotate, and the slider 22 in turn drives the annular shell 40 to rotate, thereby driving the mixing structure 50 on the annular shell 40 to rotate. The slider 22 can also drive the mixing structure 50 to move up and down, thus enabling the mixing of concrete at different heights.

[0054] The portion of the second annular shell 41 located within the inner cavity of the first annular shell 40 is also provided with a rotating guide groove 411. This rotating guide groove 411 works in conjunction with the mixing structure 50. The rotating guide groove 411 allows the mixing structure 50 to rotate on its own when the first annular shell 40 drives the mixing structure 50 to rotate. A circular baffle 60 that can open and close automatically is arranged above the second annular shell 41. When the circular baffle 60 is located at the top of the mixing tank 11 and is in a closed state, the second annular shell 41 drives the circular baffle 60 to descend, accelerating the discharge of concrete.

[0055] Continue to observe Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As can be seen, the mixing tank 11 is located above the main frame 10. The bottom of the mixing tank 11 is provided with a discharge pipe 111, which is used to transport the mixed concrete out of the station. The top of the mixing tank 11 is provided with a feed pipe 112, which is used in conjunction with the inclined belt conveyor 12 to transport raw materials into the mixing tank 11. The top of the rotating column 20 penetrates the mixing tank 11 and is located in the inner cavity of the mixing tank 11. The bottom of the rotating column 20 is rotatably connected to the four-corner frame 16. The four-corner frame 16 is fixedly connected to the bottom wall of the inner cavity of the mixing tank 11. The four-corner frame 16 ensures that the rotating column 20 maintains stable operation during the mixing process, preventing shaking or deviation, and improving the stability and safety of the mixing process.

[0056] Continue to observe Figure 2 As can be seen, the power unit 30 includes a motor 31, which is the core component of the power unit 30. The motor 31 is a servo motor, which can control speed and position accuracy very accurately. The output end of the motor 31 is fixedly equipped with a pulley 32, while the pulley 33 is sleeved on the outer ring of the rotating column 20. The two pulleys are connected by a transmission belt 34. Through the cooperation of the pulley 32, the pulley 33 and the transmission belt 34, the motor 31 can efficiently transmit the power output by the motor 31 to the rotating column 20, ensuring the operation of the rotating column 20. The pulley system is simple in design and easy to install and maintain.

[0057] Continue to observe Figure 3 , Figure 4 , Figure 5 , Figure 6 ,and Figure 7 As can be seen, the telescopic hose 24 is fixed on the upper and lower sides of the slider 22 and sleeved on the outer ring of the lead screw 21. The ends of the two telescopic hoses 24 away from the slider 22 are fixedly connected to the inner cavity of the rotating column 20. The design of the telescopic hose 24 allows it to extend and retract as the slider 22 moves.

[0058] The presence of the telescopic hose 24 effectively prevents the concrete in the inner cavity of the mixing tank 11 from contacting the screw 21, preventing the concrete from damaging the threads of the screw 21 and affecting the movement of the slider 22.

[0059] Continue to observe Figure 3 , Figure 5 , Figure 9 , Figure 10 and Figure 11As can be seen, the stirring structure 50 includes a rectangular plate 51, which is disposed in the inner cavity of the annular outer shell 40. The rectangular plate 51 serves as the structural foundation for connecting and supporting the stirring rod 53 and the sliding rod 52. The side of the rectangular plate 51 closest to the annular outer shell 41 is fixedly connected to the sliding rod 52. The annular outer shell 41 is provided with a rotating guide groove 411, in which the sliding rod 52 slides. The side of the rectangular plate 51 away from the sliding rod 52 is provided with a stirring rod 53 that penetrates the annular outer shell 40.

[0060] The mixing rod 53 passes through the annular outer shell 40. When the annular outer shell 40 rotates, the mixing rod 53 will also rotate with the annular outer shell 40. At this time, the mixing rod 53 will drive the slide rod 52 to move in the rotating guide groove 411 through the rectangular plate 51. The rotating guide groove 411 allows the mixing rod 53 to rotate, which can more effectively mix the concrete and avoid dead corners. The connection between the rotating guide groove 411 and the slide rod 52 is located in the inner cavity of the annular outer shell 40, which can effectively prevent concrete from clogging the rotating guide groove 411.

[0061] Continue to observe Figure 4 , Figure 5 and Figure 18 As can be seen, the circular baffle 60 includes a first baffle 61 and a second baffle 62 with openings. The bottom of the first baffle 61 is fixedly connected to the top of the cross 223, and the second baffle 62 is rotatably connected to the second annular shell 41. The top of the second baffle 62 is provided with an automatic opening and closing device 70. This design allows the second baffle 62 to be rotated by the automatic opening and closing device 70 during mixing, so that the opening of the second baffle 62 is connected to the opening of the first baffle 61, thus not blocking the passage of concrete.

[0062] The automatic opening and closing device 70 is located on top of the second baffle 62 and can control the rotation of the second baffle 62. During material discharge, the automatic opening and closing device 70 can make the openings of the first baffle 61 and the second baffle 62 misaligned, so that the second baffle 62 blocks the opening of the first baffle 61. As the second annular shell 41 descends, the concrete is squeezed out through the discharge pipe 111. This mechanism accelerates the discharge of concrete.

[0063] Through observation Figure 4 , Figure 14 , Figure 15 , Figure 16 , Figure 17 and Figure 19As can be seen, the automatic opening and closing device 70 includes a protective shell 71, which is sleeved on the outer ring of the rotating column 20. A plurality of inclined blocks 72 are provided on the side of the inner cavity of the protective shell 71 away from the rotating column 20. The bottom of the inclined blocks 72 is provided with a limiting post 73 that penetrates the protective shell 71. The limiting post 73 extends to the opening of the baffle 61 and the baffle 62. The outer ring of the limiting post 73 is sleeved with a spring 74 whose two ends are fixed to the protective shell 71 and the inclined block 72 respectively.

[0064] The top of the inclined block 72 is provided with an inclined block 75 that works in conjunction with the inclined block 72. An electric telescopic rod 76 that is fixed to the inner wall of the protective shell 71 is fixed to the side of the inclined block 75 near the rotating column 20.

[0065] An electric telescopic rod 77 is fixed on the side of the protective housing 71 away from the rotating column 20. A limit rod 78 is fixed at the output end of the electric telescopic rod 77. The limit rod 78 passes through the protective housing 71 and is engaged with the rotating column 20. The protective housing 71 has space for installing a rechargeable battery. The rechargeable battery can provide power to the electric telescopic rod 76 and the electric telescopic rod 77.

[0066] By operating the electric telescopic rod 77, the limiting rod 78 can be driven to move towards the rotating column 20, so that the limiting rod 78 engages or disengages from the rotating column 20. When the limiting rod 78 engages with the rotating column 20, the rotating column 20 can drive the protective shell 71 to rotate through the limiting rod 78. In addition, the protective shell 71 is also equipped with an electric telescopic rod 76, which can push the inclined block 75 towards the inclined block 72. By controlling the inclined block 75 to move closer to or further away from the inclined block 72, the distance that the limiting column 73 extends into the opening of the baffle 61 and the baffle 62 can be adjusted, thereby adjusting or fixing the position of the baffle 62.

[0067] When the limiting post 73 extends to the opening of the second baffle 62, the protective shell 71 can drive the second baffle 62 to rotate, adjusting the position of the openings of the first baffle 61 and the second baffle 62; when the limiting post 73 passes through the opening of the second baffle 62 and extends to the opening of the first baffle 61, it can fix the position of the second baffle 62, preventing the second baffle 62 from rotating.

[0068] The usage process of this invention:

[0069] 1. The motor 31 transmits power to the rotating column 20 through the first pulley 32, the second pulley 33 and the transmission belt 34. The rotating column 20 drives the internal slider 22 to rotate. While rotating, the slider 22 moves up and down on the outer ring of the lead screw 21.

[0070] 2. The rotation of slider 22 drives annular shell 40 and annular shell 41 respectively through connector 1 221 and connector 222. Annular shell 40 can rotate and move up and down, while annular shell 41 can only move up and down.

[0071] 3. The annular outer shell 40 drives multiple stirring structures 50 to move up and down inside the mixing chamber 11. At the same time, the annular outer shell 40 drives these stirring structures 50 to rotate around the annular outer shell 41. At this time, the slide rod 52 closest to the rotating guide groove 411 is guided to the rotating guide groove 411. The rotating guide groove 411 is similar to a triangular chute. When the slide rod 52 moves towards the center of the rotating guide groove 411, the rectangular plate 51 connecting the slide rod 52 and the slide rod 52 away from the rotating guide groove 411 will rotate in the rotation direction of the annular outer shell 40.

[0072] 4. At the top center of the rotating guide groove 411, there is a square groove. When the slide rod 52 enters the square groove, the rectangular plate 51 will continue to rotate with the slide rod 52 as the center, and drive the slide rod 52 away from the rotating guide groove 411 to continue to rotate along the rotation direction of the annular shell 40. After rotating a certain angle, the annular shell 40 will drive the slide rod 52 located in the square groove to move along the other half of the rotating guide groove 411.

[0073] 5. At this time, the slide rod 52 that is away from the rotating guide groove 411 will move to the front of the slide rod 52 that was originally moving in the rotating guide groove 411. During the process of the slide rod 52 entering and leaving the rotating guide groove 411, the stirring rod 53 completes one rotation.

[0074] 6. After mixing is complete, activate the automatic opening and closing device 70, so that the electric telescopic rod 77 drives the limiting rod 78 to engage with the rotating column 20. The rotating column 20 drives the baffle 62 fixed to the protective shell 71 to rotate. When the baffle 62 can block the opening of the baffle 61, stop rotating. The electric telescopic rod 77 drives the limiting rod 78 to disengage from the rotating column 20.

[0075] 7. The electric telescopic rod 76 drives the inclined block 75 to move. The inclined block 75 presses against the inclined block 72 and the limiting post 73 fixed to the inclined block 72. The limiting post 73 passes through the opening of the baffle 61 and the baffle 62, restricting the rotation of the baffle 62.

[0076] 8. At this time, the first baffle 61 and the second baffle 62, through the downward movement of the second annular shell 41, squeeze the concrete toward the discharge pipe 111, accelerating the discharge of the concrete.

[0077] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A small multi-functional concrete mixing plant, comprising a main frame (10) and a mixing box (11) and an inclined belt conveyor (12) installed on the main frame (10), wherein a conveyor (13) is provided on one side of the mixing box (11) and an aggregate storage bin (14) is provided on one side of the inclined belt conveyor (12). Its features are: The mixing tank (11) is equipped with a rotating column (20), and a lead screw (21) is rotatably connected inside the rotating column (20). A slider (22) is threaded on the outer ring of the lead screw (21). The top of the lead screw (21) is fixedly connected to the L-shaped frame (15) at the top of the mixing tank (11). A power device (30) for driving the rotating column (20) to rotate is installed on the top of the mixing tank (11). The rotating column (20) is fitted with an annular outer shell 1 (40) and an annular outer shell 2 (41). The slider (22) is fixed with a connector 1 (221) and a connector 2 (222) that pass through the rotating column (20). The connector 1 (221) is fixedly connected to the inner ring of the annular outer shell 1 (40), and the connector 2 (222) is rotatably connected to the inner ring of the cross (223). The protruding part of the cross (223) passes through the annular outer shell 2 (41) and is slidably connected to the inner wall of the mixing tank body (11). The outer ring of the first annular shell (40) is provided with a number of stirring structures (50), and the part of the second annular shell (41) that penetrates the inner cavity of the first annular shell (40) is provided with a rotating guide groove (411) that allows the stirring structures (50) to rotate. A circular baffle (60) that can open and close automatically is arranged above the second annular shell (41). The circular baffle (60) includes a baffle one (61) and a baffle two (62) with an opening. The bottom of the baffle one (61) is fixedly connected to the top of the cross (223), and the baffle two (62) is rotatably connected to the annular outer shell two (41). An automatic opening and closing device (70) is fixed on the top of the baffle two (62). The automatic opening and closing device (70) includes a protective shell (71), which is fitted around the outer ring of the rotating column (20) and fixedly connected to the second baffle (62). A number of inclined blocks (72) are provided on the side of the inner cavity of the protective shell (71) away from the rotating column (20). The bottom of the inclined block (72) is provided with a limiting post (73) that penetrates the protective shell (71). The limiting post (73) extends to the opening of the first baffle (61) and the second baffle (62). The outer ring of the limiting post (73) is fitted with a spring (74) whose two ends are fixed to the protective shell (71) and the inclined block (72) respectively. The top of the first inclined block (72) is provided with a second inclined block (75) that works in conjunction with the first inclined block (72). The side of the second inclined block (75) near the rotating column (20) is fixed with an electric telescopic rod (76) that is fixed to the inner wall of the protective shell (71). The protective shell (71) is fixed with an electric telescopic rod two (77) on the side away from the rotating column (20). The output end of the electric telescopic rod two (77) is fixed with a limit rod (78). The limit rod (78) passes through the protective shell (71) and is engaged with the rotating column (20).

2. The small-scale multi-functional concrete mixing plant according to claim 1, characterized in that: The bottom of the mixing tank (11) is provided with a discharge pipe (111) that passes through the main frame (10), and the top of the mixing tank (11) is provided with a feed pipe (112) that works with the inclined belt conveyor (12). The top of the rotating column (20) passes through the mixing tank (11), and the bottom of the rotating column (20) is rotatably connected to the four corner frame (16). The four corner frame (16) is fixedly connected to the bottom wall of the inner cavity of the mixing tank (11).

3. The small-scale multi-functional concrete mixing plant according to claim 1, characterized in that: The power unit (30) includes a motor (31) and a pulley (32) fixedly mounted on the output end of the motor (31). A pulley (33) is mounted on the outer ring of the rotating column (20). A transmission belt (34) is mounted on the outer ring of the pulley (32) and the pulley (33). The output end of the motor (31) is rotatably connected to the top of the mixing tank (11).

4. A small-scale multi-functional concrete mixing plant according to claim 1, characterized in that: Both sides of the slider (22) are fixed with telescopic hoses (24) sleeved on the outer ring of the lead screw (21). The ends of the two telescopic hoses (24) away from the slider (22) are fixedly connected to the inner cavity of the rotating column (20). The second annular shell (41) is set on the top of the first annular shell (40).

5. A small-scale multi-functional concrete mixing plant according to claim 1, characterized in that: The stirring structure (50) includes a rectangular plate (51) disposed in the inner cavity of the first annular shell (40). A slide rod (52) that is slidably connected to the rotating guide groove (411) is fixed on the side of the rectangular plate (51) near the second annular shell (41). A stirring rod (53) that penetrates the first annular shell (40) is fixed on the side of the rectangular plate (51) away from the slide rod (52).

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