Continuous discharge concrete vacuum kneader

Abstract

The utility model relates to a continuous discharging concrete vacuum kneading machine belonging to the technical field of concrete mixing, solves the problems of high equipment cost, difficult to guarantee the vacuum treatment effect, the equipment cannot work continuously and the discharging process is easy to mix air bubbles again in the prior art, and comprises a storage mixing tank provided with a vibrating screen at the top, a tank bottom outlet of the storage mixing tank is connected with a main vacuum tank feeding port through a tank bottom conveying pipeline, the main vacuum tank is connected with a vacuum pump station, two sides of the main vacuum tank are respectively provided with auxiliary storage tanks, a material distribution feeding port of the auxiliary storage tank is connected with a main vacuum tank discharging port through a material distribution screw conveyor, a material distribution discharging port of the auxiliary storage tank is connected with a mortar pump feeding port through a pipeline, and a mortar pump discharging port is connected with a conveying pipeline, which is reasonable in design, compact in structure, carries out the concrete vacuum treatment process in a closed space, avoids mixing air bubbles again, effectively prevents the air leakage of sealing elements from affecting the concrete performance, is low in equipment cost and suitable for batch production.

Description

Technical Field

[0001] This utility model belongs to the field of concrete mixing technology, specifically relating to a continuous discharge concrete vacuum kneading machine. Background Technology

[0002] Mixing concrete under vacuum (or negative pressure) effectively reduces the air bubble content, improves its density and homogeneity, and consequently enhances its surface quality, compressive strength, modulus of elasticity, and durability. The traditional process involves sealing the concrete mixing equipment, using a vacuum pump to create negative pressure, mixing the concrete under this pressure, and then discharging it for transport or pumping. However, this process has the following drawbacks: ① The equipment requires reinforcement to withstand air pressure, and the raw material feeding, transmission, and unloading devices all need to be sealed, leading to excessively high equipment costs; ② Wear and leakage in these seals significantly reduces the effectiveness of the vacuum process; ③ The equipment cannot operate continuously; ④ Air bubbles are reintroduced during the unloading process. Therefore, it is necessary to improve the existing concrete mixing methods and equipment. Utility Model Content

[0003] This invention addresses the aforementioned problems by providing a concrete vacuum kneading machine that allows the concrete vacuum treatment process to be carried out in a sealed space, avoiding secondary air bubbles, effectively preventing air leakage from the seals from affecting concrete performance, and offering low equipment cost and continuous discharge suitable for mass production.

[0004] The technical solution adopted by this utility model is as follows: the continuous discharge concrete vacuum kneading machine includes a storage mixing tank. The top of the storage mixing tank is equipped with a vibrating screen to prevent foreign matter from entering the tank. The bottom outlet of the storage mixing tank is connected to the inlet of the main vacuum tank through a bottom conveying pipeline. The vacuum port of the main vacuum tank is connected to a vacuum pump station through a vacuum pipeline. Auxiliary storage tanks are respectively arranged on both sides of the main vacuum tank. The feed inlets of the auxiliary storage tanks are respectively connected to the outlet of the main vacuum tank through a feed screw conveyor. The feed outlets of the auxiliary storage tanks are respectively connected to the inlets of corresponding mortar pumps through pipelines. The outlets of the mortar pumps are connected to the concrete conveying pipeline.

[0005] The main vacuum tank includes a main body with a rotating stirring mechanism inside. The driving end of the stirring mechanism is connected to the output end of a stirring drive motor. A top cover is provided on the top of the main body, and a feed inlet is located on the upper side wall of the main body. The feed inlet is connected to the upper port of the bottom conveying pipeline via a feed elbow, and a pneumatic butterfly valve is installed at the feed inlet. A discharge outlet is located on the lower side wall of the main body, connected to the upper port of a distribution screw conveyor. A vacuum pump station is used to create negative pressure inside the main vacuum tank. After concrete enters the main vacuum tank, the stirring drive motor drives the stirring mechanism to rotate and stir, effectively removing air bubbles under the combined action of stirring and negative pressure.

[0006] The mixing mechanism includes several sets of mixing blades arranged at the bottom inner side of the vacuum tank body. Each mixing blade is connected to a connecting rod rotating disk fixedly mounted on the upper end of the mixing shaft via an L-shaped blade connecting rod. The mixing shaft extends to its lower end on the outer side of the bottom of the vacuum tank body and is connected to the output end of a mixing drive motor. Furthermore, a mixing shaft sealing sleeve is provided on the outside of the mixing shaft. The mixing drive motor drives the mixing shaft to rotate, thereby continuously mixing the concrete inside the main vacuum tank under vacuum conditions through the mixing blades at the lower ends of the several sets of blade connecting rods connected to the connecting rod rotating disk.

[0007] The vacuum tank cover is rotatably connected to the side of the upper opening of the vacuum tank body via a cover opening and closing arm. One end of the cover opening and closing arm is hinged to an opening and closing arm hinge seat provided on the side of the upper opening, and the other end of the cover opening and closing arm is hinged to a hinge ear plate provided in the middle of the vacuum tank cover. The vacuum tank cover is also provided with a lifting ring. The cover opening and closing arm facilitates the quick and smooth opening and closing of the vacuum tank cover on the top of the main vacuum tank, making it easy to clean the main vacuum tank; at the same time, it also facilitates the inspection and maintenance of the stirring mechanism inside the vacuum tank body.

[0008] The auxiliary storage tank is equipped with a wall vibrator on its outer wall. The feed inlet of the auxiliary storage tank is connected to the lower outlet of the distribution screw conveyor via a flange elbow, and a rubber flexible connection is also provided between the feed inlet and the flange elbow. A distribution outlet is located at the bottom of the auxiliary storage tank, and this outlet is connected to the inlet of a corresponding mortar pump via a pipeline. The wall vibrator at the bottom of the auxiliary storage tank facilitates the removal of secondary mixed air bubbles. Furthermore, the distribution screw conveyor is located on the side of the main vacuum tank, and one main vacuum tank can be equipped with multiple distribution screw conveyors, auxiliary storage tanks, and mortar pumps.

[0009] The cooling water tank of the vacuum pump station is connected to the cooling system of the slurry pump via a centrifugal pump. This integrates the cooling systems of the vacuum pump station and the slurry pump, reducing the space occupied by the device and facilitating inspection and maintenance.

[0010] The beneficial effects of this utility model are as follows: Because this utility model uses a storage and mixing tank, with a vibrating screen at the top, and the bottom outlet of the storage and mixing tank connected to the inlet of the main vacuum tank via a bottom conveying pipeline, and the vacuum port of the main vacuum tank connected to a vacuum pump station via a vacuum pipeline, and auxiliary storage tanks are respectively set on both sides of the main vacuum tank, with the distribution inlet of the auxiliary storage tank connected to the outlet of the main vacuum tank via a distribution screw conveyor, and the distribution outlet of the auxiliary storage tank connected to the inlet of the mortar pump via a pipeline, and the outlet of the mortar pump connected to the concrete conveying pipeline, its design is reasonable, compact, and highly automated. The concrete vacuum treatment process is carried out in a sealed space, avoiding secondary mixing of air bubbles. Furthermore, the auxiliary storage tanks can effectively prevent air leakage from the seals from affecting the concrete performance. The equipment cost is low, and one set of vacuum kneading machine can be matched with multiple concrete conveying equipment, making it suitable for mass production. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model.

[0012] Figure 2 yes Figure 1 Top view.

[0013] Figure 3 yes Figure 1 Side view (with the storage mixing tank and vacuum pump station removed).

[0014] Figure 4 yes Figure 1 A schematic diagram of the main vacuum tank in the process.

[0015] Figure 5 yes Figure 4 Side view.

[0016] The numbers in the diagram are as follows: 1. Storage and mixing tank; 2. Vibrating screen; 3. Tank bottom conveying pipeline; 4. Main vacuum tank; 5. Working platform; 6. Auxiliary storage tank; 7. Mortar pump; 8. Vacuum pump station; 9. Distribution screw conveyor; 10. Flange elbow; 11. Rubber flexible connection; 12. Distribution feed inlet; 13. Bin wall vibrator; 14. Distribution discharge outlet; 15. Vacuum tank body; 16. Vacuum tank top cover; 17. Top cover opening and closing arm; 18. Opening and closing arm hinge seat; 19. Hinge ear plate; 20. Lifting ring; 21. Vacuum tank feed inlet; 22. Pneumatic butterfly valve; 23. Mixing blade; 24. Blade connecting rod; 25. Connecting rod rotating connecting plate; 26. Mixing shaft; 27. Mixing shaft sealing sleeve; 28. Mixing drive motor; 29. ​​Vacuum tank discharge outlet. Detailed Implementation

[0017] according to Figures 1-5The specific structure of this utility model is described in detail below. This continuous discharge concrete vacuum kneading machine includes a storage mixing tank 1. A vibrating screen 2 is installed on the top of the storage mixing tank 1 to prevent impurities from entering the tank. A low-speed mixing mechanism is installed inside the storage mixing tank 1 to prevent concrete segregation and adhesion to the walls. The transmission adopts a gear ring structure, suitable for normal operation of the device in harsh environments. The bottom outlet of the storage mixing tank 1 is connected to the inlet of the main vacuum tank 4, which is located on the working platform 5, via a bottom conveying pipeline 3 (or a screw conveyor). The vacuum port of the main vacuum tank 4 is connected to a vacuum pump station 8 via a vacuum pipeline. The cooling water tank of the vacuum pump station 8 is connected to the cooling system of the mortar pump 7 used for concrete conveying via a centrifugal pump, thus integrating the cooling systems of the vacuum pump station 8 and the mortar pump 7 together, reducing the space occupied by the device and facilitating inspection and maintenance.

[0018] The main vacuum tank 4 includes a vacuum tank body 15, within which a stirring mechanism is rotatably mounted. The drive end of the stirring mechanism is connected to the output end of a stirring drive motor 28. A vacuum tank cover 16 is mounted on the top of the vacuum tank body 15. The vacuum tank cover 16 is rotatably connected to the side of the upper opening of the vacuum tank body 15 via a cover opening and closing arm 17. One end of the cover opening and closing arm 17 is hinged to an opening and closing arm hinge seat 18 located on the side of the upper opening, while the other end is hinged to a hinge ear plate 19 located in the middle of the vacuum tank cover 16. This opening and closing arm 17 facilitates the quick and smooth opening and closing of the vacuum tank cover 16 on the top of the main vacuum tank 4, making cleaning of the main vacuum tank 4 easier. It also facilitates the inspection and maintenance of the stirring mechanism inside the vacuum tank body 15. Additionally, a lifting ring 20 is mounted on the vacuum tank cover 16, and a vacuum gauge and observation hole are also provided on the top of the vacuum tank cover 16 for checking the equipment's operating status.

[0019] A vacuum tank inlet 21 is provided on the upper side wall of the vacuum tank body 15. The vacuum tank inlet 21 is connected to the upper port of the conveying pipeline 3 at the bottom of the tank through a feed elbow, and a pneumatic butterfly valve 22 is provided at the vacuum tank inlet 21. Vacuum tank outlets 29 are respectively provided on the two side walls of the lower part of the vacuum tank body 15. The vacuum tank outlets 29 are connected to the upper port of the material distribution screw conveyor 9. The vacuum pump station 8 is used to generate a negative pressure (-0.075 to -0.09 MPa) in the main vacuum tank 4. After the concrete enters the main vacuum tank 4, the stirring drive motor 28 drives the stirring mechanism to rotate and stir. Under the combined action of stirring and negative pressure, air bubbles are fully removed, and the air content of the concrete is reduced to below 1%. Multiple load sensors are provided on the vacuum tank body 15 to automatically control the feeding. After the concrete enters the bottom of the main vacuum tank 4, it enters the auxiliary storage tank 6 or pressure conveying equipment through the screw extrusion action.

[0020] The mixing mechanism inside the vacuum tank body 15 includes several sets of mixing blades 23 arranged at the bottom inner side of the vacuum tank body 15. Each mixing blade 23 is connected to a connecting rod rotating disk 25 fixedly mounted on the upper end of a vertically arranged mixing shaft 26 via an L-shaped blade connecting rod 24. The mixing shaft 26 extends to the lower end of the outer side of the bottom of the vacuum tank body 15 and is connected to the output end of a mixing drive motor 28. Furthermore, a mixing shaft sealing sleeve 27 is provided on the outside of the mixing shaft 26. Thus, the mixing drive motor 28 drives the mixing shaft 26 to rotate, thereby continuously mixing the concrete inside the main vacuum tank 4 in a vacuum environment via the mixing blades 23 at the lower ends of the several sets of blade connecting rods 24 connected to the connecting rod rotating disk 25.

[0021] Auxiliary storage tanks 6 are respectively installed on both sides of the main vacuum tank 4. The feed inlets 12 of the auxiliary storage tanks 6 are connected to the vacuum tank outlets 29 of the main vacuum tank 4 via feed screw conveyors 9. The feed outlets 14 of the auxiliary storage tanks 6 are connected to the feed inlets of the corresponding mortar pumps 7 via pipelines. The outlet of the mortar pumps 7 is connected to the concrete conveying pipeline. After conventional mixing, the concrete enters the primary storage mixing tank 1 and then enters the main vacuum tank 4 for vacuum treatment to remove air bubbles. Then, it enters the secondary auxiliary storage tanks 6 via feed screw conveyors 9. The auxiliary storage tanks 6 are then connected to the concrete conveying equipment (e.g., mortar pumps 7) via sealed pipelines.

[0022] The auxiliary storage tank 6 is equipped with a wall vibrator 13 on its outer wall. The feed inlet 12 of the auxiliary storage tank 6 is connected to the lower outlet of the feed screw conveyor 9 via a flange elbow 10, and a rubber flexible connection 11 for buffering wall vibration is provided between the feed inlet 12 and the flange elbow 10. A feed outlet 14 is located at the bottom of the auxiliary storage tank 6, and is connected to the inlet of the corresponding mortar pump 7 via a pipeline. A material level control electrode is installed inside the auxiliary storage tank 6 to achieve automatic feeding. Furthermore, the wall vibrator 13 at the bottom of the auxiliary storage tank 6 facilitates the removal of secondary mixed air bubbles. Simultaneously, the feed screw conveyor 9 is located on the side of the main vacuum tank 4, allowing one main vacuum tank 4 to be equipped with multiple feed screw conveyors 9, auxiliary storage tanks 6, and mortar pumps 7.

[0023] When using this continuous discharge concrete vacuum kneading machine, firstly, a vacuum pump station 8 creates negative pressure inside the main vacuum tank 4. Then, the mixed concrete is poured into the atmospheric pressure mixing tank through the feed inlet with a vibrating screen 2 at the top of the storage mixing tank 1 (if the quantity is small, it can also be directly mixed in the atmospheric pressure storage mixing tank 1). Due to the negative pressure, the concrete is drawn into the main vacuum tank 4 through the gate valve at the bottom of the storage mixing tank 1 and the bottom conveying pipeline 3. The mixing drive motor 28 drives the mixing shaft 26 to rotate, and several sets of mixing blades 23 continuously mix the concrete in the main vacuum tank 4 under vacuum. After entering the main vacuum tank 4, the concrete, under the combined action of mixing and negative pressure, fully removes air bubbles, reducing the air content of the concrete to below 1%.

[0024] Afterwards, the thoroughly mixed concrete enters the auxiliary storage tank 6 via the distribution screw conveyor 9, and the vibrator 13 at the bottom of the auxiliary storage tank 6 is used to remove any air bubbles that have been mixed in during the secondary mixing process. The distribution outlet 14 of the auxiliary storage tank 6 is connected to the mortar pump 7 via a sealed pipeline. Subsequently, the mortar pump 7 is started to deliver concrete into the atmospheric pressure mixing equipment, and parameters such as the concrete's fluidity, air content, and pumping pressure are checked. Once everything is normal, pouring begins. A pressure-resistant hose is connected to the pressure conveying equipment and the pouring valve of the template or mold to pour concrete into the template or mold. After pouring is completed, the exhaust valve and pouring valve are closed in sequence. After curing at room temperature or with heat until the concrete reaches the demolding strength, demolding is performed. It is understandable that, if necessary, the mold can be sealed by connecting a vacuum system and an exhaust valve to create negative pressure inside the mold, assisting the concrete to flow within the mold and further improving the density and surface quality of the concrete.

Claims

1. A continuous discharge concrete vacuum kneading machine, comprising a storage and mixing tank (1), characterized in that: The top of the storage mixing tank (1) is equipped with a vibrating screen (2) to prevent debris from entering the tank. The bottom outlet of the storage mixing tank (1) is connected to the inlet of the main vacuum tank (4) through the bottom conveying pipeline (3). The vacuum port of the main vacuum tank (4) is connected to the vacuum pump station (8) through the vacuum pipeline. The main vacuum tank (4) is equipped with auxiliary storage tanks (6) on both sides. The feed inlet (12) of the auxiliary storage tank (6) is connected to the outlet of the main vacuum tank (4) through the feed screw conveyor (9). The discharge outlet (14) of the auxiliary storage tank (6) is connected to the inlet of the corresponding mortar pump (7) through the pipeline. The outlet of the mortar pump (7) is connected to the concrete conveying pipeline.

2. The continuous discharge concrete vacuum kneading machine according to claim 1, characterized in that: The main vacuum tank (4) includes a vacuum tank body (15), a stirring mechanism is rotatably installed inside the vacuum tank body (15), and the driving end of the stirring mechanism is connected to the output end of the stirring drive motor (28); a vacuum tank cover (16) is installed on the top of the vacuum tank body (15), a vacuum tank inlet (21) is installed on the upper side wall of the vacuum tank body (15), the vacuum tank inlet (21) is connected to the upper port of the bottom conveying pipeline (3) through the inlet elbow, and a pneumatic butterfly valve (22) is installed at the vacuum tank inlet (21); a vacuum tank outlet (29) is installed on the lower side wall of the vacuum tank body (15), and the vacuum tank outlet (29) is connected to the upper port of the material distribution screw conveyor (9).

3. The continuous discharge concrete vacuum kneading machine according to claim 2, characterized in that: The stirring mechanism includes several sets of stirring blades (23) arranged on the bottom inner side of the vacuum tank body (15). The stirring blades (23) are connected to the connecting rod rotating connecting disk (25) fixedly installed on the upper end of the stirring shaft (26) through L-shaped blade connecting rods (24). The stirring shaft (26) extends to the lower end of the bottom outer side of the vacuum tank body (15) and is connected to the output end of the stirring drive motor (28). Furthermore, a stirring shaft sealing sleeve (27) is also provided on the outside of the stirring shaft (26).

4. The continuous discharge concrete vacuum kneading machine according to claim 2, characterized in that: The vacuum tank cover (16) is rotatably connected to the side of the upper opening of the vacuum tank body (15) via the cover opening and closing arm (17). One end of the cover opening and closing arm (17) is hinged to the opening and closing arm hinge seat (18) provided on the side of the upper opening, and the other end of the cover opening and closing arm (17) is hinged to the hinge ear plate (19) provided in the middle of the vacuum tank cover (16). The vacuum tank cover (16) is also provided with a lifting ring (20).

5. The continuous discharge concrete vacuum kneading machine according to claim 1, characterized in that: The auxiliary storage tank (6) is equipped with a silo vibrator (13) on the outer wall of the tank body. The feed inlet (12) of the auxiliary storage tank (6) is connected to the lower outlet of the feed screw conveyor (9) through a flange elbow (10). A rubber flexible connection (11) is also provided between the feed inlet (12) and the flange elbow (10). The bottom of the auxiliary storage tank (6) is equipped with a feed outlet (14), which is connected to the feed inlet of the corresponding mortar pump (7) through a pipeline.

6. The continuous discharge concrete vacuum kneading machine according to claim 1, characterized in that: The cooling water tank of the vacuum pump station (8) is connected to the cooling system of the mortar pump (7) via a centrifugal pump.

Images