Device for stirring and pouring concrete under vacuum condition

Abstract

The invention relates to a device for stirring and pouring concrete under a vacuum condition, and belongs to the field of concrete testing devices. Comprising a stirrer body, pouring equipment and a vacuum pump system. The stirrer body comprises a stirring barrel and a sealing cover matched with the stirring barrel, a stirring assembly is arranged in the axis center of the sealing cover, the pouring equipment is connected to the lower portion of the stirrer body, and air entrainment is avoided through sealed conveying and pouring of concrete. The vacuum pump system comprises a vacuum pump and a vacuum hose, a vacuum valve is arranged on the vacuum pump, one end of the vacuum hose is connected with the vacuum valve, the other end of the vacuum hose is connected with the stirrer body and the pouring equipment, and the vacuum environment in the whole stirring, conveying and pouring process is maintained through continuous vacuumizing. Air can be effectively prevented from being mixed into concrete, bubble residues are remarkably reduced, the defect that large gaps are likely to be formed in the traditional concrete pouring process is overcome, the porosity is greatly reduced, the compactness of the concrete is improved, the mechanical property of the concrete is improved, and the building quality defect is reduced.

Description

Technical Field

[0001] The invention relates to a device for mixing and pouring concrete under vacuum conditions, belonging to the technical field of concrete testing devices. Background Art

[0002] In the traditional concrete mixing process, cement, water, coarse aggregate and fine aggregate are mixed in a mixer according to a predetermined ratio under atmospheric pressure, and then poured and cured in a natural environment. However, mixing and pouring in an atmospheric environment will inevitably introduce air, resulting in the formation of pores and bubbles inside the concrete, which will affect the molding quality, reduce the density of the concrete, and weaken its strength and durability. Existing research mainly focuses on the following two aspects: (1) Vacuuming during mixing: Vacuuming during mixing to reduce bubbles and improve the uniformity of concrete. (2) Vacuum curing after concrete pouring: Vacuum degassing technology is used to reduce bubbles in the poured concrete to improve the quality after curing.

[0003] However, existing technologies often overlook a key issue: air will still be entrained during the pouring process from the mixing barrel to the mold. Even if some bubbles have been removed during the mixing stage, during the pouring process, the fresh concrete will still be affected by gravity and flow characteristics, and will come into contact with air to produce secondary bubbles, resulting in the formation of microscopic pores in the concrete structure. These pores will not only weaken the mechanical properties of the concrete, but may also reduce the durability of the concrete due to long-term exposure to the external environment, and may even cause the building structure to be unable to withstand the load as originally designed, ultimately shortening the service life of the building. Therefore, simply relying on vacuuming during the mixing process or vacuum curing after pouring cannot completely solve the bubble problem. An optimized solution that can maintain a vacuum environment throughout the entire concrete production process (including mixing and pouring) is needed to minimize air entrainment and improve the quality of concrete molding. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a fully sealed and vacuumed concrete mixing and pouring device. According to the pouring requirements, it is equipped with specially designed pouring equipment. After sealing, the mixing barrel and the pouring equipment are connected to a vacuum pump through a vacuum hose to evacuate the inside of the mixing barrel and ensure that the mixing process and the transportation process from the mixing barrel to the pouring mold are completely sealed to avoid secondary air entrainment, so as to achieve the work of fully exhausting the air before mixing and pouring. It can quickly and effectively remove air from the concrete mixture, thereby solving the technical problem of concrete being loose after air is re-mixed during the pouring stage in the traditional process, and forming a vacuum concrete preparation process in which the "mixing-transporting-pouring" process of concrete is all carried out under vacuum conditions.

[0005] In order to achieve the above technical effects, the present invention is implemented through the following technical solutions: a device for mixing and pouring concrete under vacuum conditions, comprising: a mixer body, pouring equipment, and a vacuum pump system; the mixer body comprises a mixing barrel 1 and a sealing cover 2 matched therewith, a mixing assembly 3 is arranged at the axial center of the sealing cover 2, the pouring equipment is connected to the bottom of the mixer body, the vacuum pump system 6 comprises a vacuum pump 601, a vacuum hose 602 and a vacuum valve 603, one end of the vacuum hose 602 is connected to the vacuum valve 603, and the other end is respectively connected to the mixer body and the pouring equipment.

[0006] Specifically, the outer surface of the sealing cover 2 is penetrated by a first exhaust port 201 , a vacuum gauge 202 , and a water inlet 204 . The first exhaust port 201 is connected to a first exhaust valve 205 , and the first exhaust valve 205 is connected to a vacuum valve 603 via a vacuum hose 602 .

[0007] Preferably, an observation window 203 and a handle 206 are also provided through the outer surface of the sealing cover 2 .

[0008] Specifically, the casting equipment includes a discharge assembly 4 and a receiving assembly 5. The discharge assembly 4 includes a discharge pipe 401 and a discharge valve 402 installed thereon. The discharge pipe 401 is installed directly below the mixing barrel 1. The receiving assembly 5 is connected directly below the discharge assembly 4 and is connected to the vacuum pump system 6.

[0009] Preferably, a flange 101 is provided at the connection between the top edge of the mixing barrel 1 and the sealing cover 2, and a matching first bolt hole 102 is provided on the flange 101. The sealing cover 2 is fixed to the mixing barrel 1 by bolts 103. An annular sealing groove 104 is provided on the flange 101, and a mixing barrel sealing ring 105 is installed in the annular sealing groove 104. Four supporting legs 106 are fixedly connected to the lower surface of the mixing barrel 1.

[0010] Specifically, the stirring assembly 3 includes a stirring motor 301, a stirring shaft 302, and a stirring blade 303. The stirring motor 301 is sealed and fixed on the outer surface of the shaft center of the sealing cover 2. The stirring shaft 302 passes through the sealing cover 2 and is fixed to the output end of the motor 301. The outer surface of the stirring shaft 302 is fixed with a stirring blade 303.

[0011] Specifically, the material receiving assembly 5 includes an open cubic steel mold 501 and a detachable steel mold upper cover 502. The top of the steel mold upper cover 502 is provided with a first material receiving port 503 and a second exhaust port 504. The first material receiving port 503 is connected to the discharge pipe 401, and the second exhaust port 504 is connected to the second exhaust valve 506. The second exhaust valve 506 is connected to the vacuum valve 603 through a vacuum hose 602.

[0012] Preferably, the cubic steel mold 501 and the steel mold upper cover 502 are provided with a first flange 507 extending horizontally outward, and a matching second bolt hole 508 and a steel mold sealing ring 505 are provided at the corresponding position of the first flange 507, and the steel mold upper cover 502 is fixed to the cubic steel mold 501 by passing bolts through the steel mold sealing ring 505.

[0013] Specifically, the material receiving assembly 5 includes a vacuum container 7, a concrete mold 701, and an uncovered material baffle plate 702. The vacuum container 7 includes a container formed by welding a bottom plate, four side plates, and a sealing plate 703. The concrete mold 701 is placed inside the vacuum container 7. The uncovered material baffle plate 702 is provided with a horizontally extending convex plate, which is placed above the concrete mold 701. A second material receiving port 707 is provided in the middle of the sealing plate 703, and a third exhaust port 708 is provided at the corner. The material receiving port 708 is connected to the discharge pipe 401, and the third exhaust port 708 is connected to the vacuum hose 602.

[0014] Preferably, the vacuum container 7 is provided with a second flange 704, each side of the second flange 704 is provided with bolt holes, the sealing plate 703 is provided with bolt holes corresponding to the bolt holes of the second flange 704, the bolts are fastened through the corresponding bolt holes, the second flange 704 is provided with a sealing strip 705, four fixing parts 706 are provided on the bottom plate, and the second material receiving port 707 is connected to the discharge pipe 401 by threaded sealing.

[0015] The beneficial effects of the present invention are: 1. Concrete materials can be mixed under vacuum conditions, which greatly avoids the contact of concrete materials with air during the mixing process and effectively reduces the pores caused by air mixing during the concrete mixing process; 2. The device adds vacuum pouring equipment to complete the transportation and pouring of concrete under vacuum conditions, avoiding bubbles in the concrete due to exposure to air during the pouring process. High-density molding can be achieved during the pouring stage, thereby achieving vacuum sealing during the concrete mixing and pouring process, thereby greatly reducing the porosity of the concrete. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0017] Figure 1 It is the overall structural schematic diagram of the present invention: Figure 2 This is the front view of the mixer body; Figure 3 is a top view of the sealing cover; Figure 4 It is a schematic diagram of the mixing barrel structure; Figure 5 It is a schematic diagram of the cross section of the mixing tank; Figure 6 A schematic diagram of a structure of a material splicing component; Figure 7 This is a schematic diagram of a cubic steel mold; Figure 8 A schematic diagram of another structure of a material receiving component; Fig. 9 It is a schematic diagram of the structure of the vacuum container cavity; Fig.10 It is a schematic diagram of the connection structure between the concrete mold and the uncovered baffle plate.

[0018] The components represented by the reference numerals in the figure are: 1-mixing barrel, 2-sealing cover, 3-mixing assembly, 4-discharging assembly, 5-receiving assembly, 6-vacuum pump system, 7-vacuum container, 101-flange, 102-first bolt hole, 103-bolt, 104-annular sealing groove, 105-mixing barrel sealing ring, 106-support leg, 201-first exhaust port, 202-vacuum gauge, 203-observation window, 204-water inlet, 205-first exhaust valve, 206-handle, 301-mixing motor, 302-mixing shaft, 303-mixing blade, 40 1-discharge pipe, 402-discharge valve, 501-cubic steel mold, 502-steel mold upper cover, 503-first material receiving port, 504-second exhaust port, 505-steel mold sealing ring, 506-second exhaust valve, 507-first flange, 508-second bolt hole, 601-vacuum pump, 602-vacuum hose, 603-vacuum valve, 701-concrete mold, 702-uncovered material baffle plate, 703-sealing plate, 704-second flange, 705-sealing strip, 706-fixing part, 707-second material receiving port, 708-third exhaust port. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments.

[0020] Example 1: Figures 1 to 7 As shown, a device for mixing and pouring concrete under vacuum conditions includes a mixer body, pouring equipment, and a vacuum pump system; The mixer body comprises a mixing barrel 1 and a sealing cover 2 matched therewith, a mixing assembly 3 is arranged at the axis center of the sealing cover 2, a first exhaust port 201, a vacuum gauge 202, an observation window 203, a water inlet 204, and a handle 206 are arranged through the outer surface, and the first exhaust port 201 is provided with a first exhaust valve 205; The pouring equipment includes a discharge assembly 4 and a receiving assembly 5. The discharge assembly 4 includes a discharge pipe 401 and a discharge valve 402 for controlling the discharge of the mixing barrel 1. The receiving assembly 5 is placed directly below the mixing barrel and includes an open cubic steel mold 501 and a detachable steel mold upper cover 502. The steel mold upper cover 502 is provided with a first receiving port 503. The discharge pipe 401 is a corrugated pipe, which is connected to the first receiving port 503 through internal and external threads to discharge concrete into the receiving assembly 5. The pouring speed of concrete is adjusted by the discharge valve 402, which can prevent concrete from piling up and achieve better compaction. The discharge valve 402 is used to close and seal the passage between the discharge pipe 401 and the receiving assembly 5. The discharge valve 402 and the first receiving port 503 are both provided with corresponding sealing devices to ensure the sealing of the connection.

[0021] The vacuum pump system 6 includes a vacuum pump 601, a vacuum hose 602 and a vacuum valve 603. The vacuum hose 602 is respectively connected to the first exhaust valve 205 of the mixing barrel 1 and the second exhaust valve 506 of the material receiving assembly 5 to evacuate the interior thereof.

[0022] The top edge of the mixing barrel 1 and the sealing cover 2 are provided with a flange 101, and a first bolt hole 102 is provided on the flange 101. The sealing cover 2 is fixed to the mixing barrel 1 by bolts 103 to achieve a tight connection. An annular sealing groove 104 is provided on the flange 101, and a mixing barrel sealing ring 105 is built in. When fixing, the sealing ring is squeezed to improve the air tightness of the device.

[0023] The stirring assembly 3 includes a stirring motor 301, a stirring shaft 302, and stirring blades 303. The stirring motor 301 is sealed and fixed on the outer surface of the shaft center of the sealing cover 2. The stirring shaft 302 passes through the sealing cover 2 and is fixed to the output end of the stirring motor 301 and extends to the inside of the stirring barrel 1. The outer surface of the stirring shaft 302 is fixed with stirring blades 303 to stir the material.

[0024] The cubic steel mold 501 and the steel mold upper cover 502 are provided with a first flange 507 extending horizontally outward, and corresponding positions are provided with matching second bolt holes 508 and steel mold sealing rings 505. Bolts are used to pass through the steel mold sealing rings 505 to fix the steel mold upper cover 502 on the cubic steel mold 501, thereby achieving an airtight seal of the material receiving assembly.

[0025] The top of the steel mold upper cover 502 is provided with a first material receiving port 503 and a second exhaust port 504. The second exhaust port 504 is provided with a second exhaust valve 506 and is connected to the vacuum valve 603 through a vacuum hose 602. The discharge pipe 401 is connected to the first material receiving port 503 through a thread to ensure that the concrete can flow smoothly into the mold. The steel mold upper cover 502 has a certain height in order to pour more concrete to ensure that the cubic steel mold 501 can be filled with concrete after settling.

[0026] Example 2: Figures 8 to 10 As shown, the basic structure of this embodiment is the same as that of embodiment 1, except that the material receiving component 5 of this embodiment has a different structure from that of the material receiving component 5 of embodiment 1.

[0027] The material receiving assembly 5 of this embodiment adopts a vacuum container 7, in which a concrete mold 701 and an uncovered material blocking plate 702 are placed. The main body of the vacuum container 7 is welded by a bottom plate and four vertical side plates, and the top is sealed by a sealing plate 703 to form a highly sealed container. Four fixing members 706 are provided on the bottom plate to fix the concrete mold 701 to prevent displacement during the pouring and vibration process. The upper end of the vertical side plate extends horizontally outward to form a second flange 704, and bolt holes are evenly arranged on each side of the second flange 704. The sealing plate 703 is provided with bolt holes corresponding to the bolt holes of the second flange 704. A sealing strip 705 is arranged between the second flange 704 and the sealing plate 703, and the bolts fasten the sealing plate 703 to the second flange 704 to achieve a tight connection between the sealing plate 703 and the vacuum container 7. The second material receiving port 707 in the middle of the sealing plate 703 is connected to the discharge pipe 401 of the mixing barrel 1 through a thread, and a third exhaust port 708 is provided at the corner to connect with the vacuum pump system. The concrete mold 701 is placed inside the vacuum container 7 for forming the concrete to be poured. The uncovered material blocking plate 702 is placed above the concrete mold 701 and is provided with an extended convex plate that can contact the vacuum container 7 to keep the concrete mold 701 stable and prevent the concrete from overflowing, ensuring that the concrete can fill the concrete mold 701 after settling. After pouring is completed, the sealing plate 703 is removed and the concrete mold 701 is taken out of the vacuum container 7 for maintenance.

[0028] The construction method of the present invention is as follows: S1. Place the mixing barrel 1 on a flat surface, place the material receiving assembly 5 directly below the mixing barrel 1, thread the discharge pipe 401 of the mixing barrel 1 to the first material receiving port 503 of the steel mold upper cover 502, close the discharge valve 402, add concrete dry materials (including sand, stone, cement) into the mixing barrel 1 according to the mix ratio requirements, and then close the sealing cover 2; S2. Place a mixing barrel sealing ring 105 between the mixing barrel 1 and the sealing cover 2 to ensure that the two are in close contact. Use bolts 103 to firmly connect the mixing barrel 1 and the sealing cover 2. Use bolts and a steel mold sealing ring 505 to seal the docking material assembly 5. Connect the first exhaust port 201 located on the sealing cover 2 and the second exhaust port 504 of the steel mold upper cover 502 through a vacuum hose 602 and a vacuum pump 601. Close the first exhaust valve 205, the second exhaust valve 506, and the vacuum valve 603 to ensure that there is no air leakage at the connection to prevent air from entering and affecting the mixing effect. S3. Add a predetermined amount of water to the mixing barrel 1 from the water inlet 204, open the first exhaust valve 205, the second exhaust valve 506, and the vacuum valve 603, and start the vacuum pump 601 to evacuate the mixing barrel 1 and the material receiving assembly 5, and then start the stirring motor 301 to drive the stirring blade 303 to stir the material. Read the vacuum degree through the vacuum meter 202. When the vacuum degree reaches the requirement, ensure that the vacuum degree remains stable until the stirring is completed, then turn off the vacuum pump 601 to stop evacuating, and close the first exhaust valve 205, the second exhaust valve 506, and the vacuum valve 603 in sequence; S4. After the mixing is completed, the discharge valve 402 is opened to inject the degassed concrete into the vacuum-sealed cubic steel mold 501 or the concrete mold 701. The pouring speed of the concrete is adjusted by controlling the opening and closing of the discharge valve 402 to prevent the concrete from piling up. At this time, the air pressure in the cubic steel mold 501 or the concrete mold 701 is relatively low, which can effectively guide the concrete to fill the entire cubic steel mold 501 or the concrete mold 701. S5, after pouring is completed, the discharge valve 402 is closed, the mixing barrel 1 continues to be sealed, the discharge pipe 401 is released, and then the steel mold cover 502 is removed. In embodiment 2, the sealing plate 703 is removed, and then the concrete specimen is placed on a vibration table for vibration treatment to make the concrete specimen compact, and then placed under natural conditions for curing; S6. After the pouring of the first concrete specimen is completed, the discharge pipe 401 and the steel mold upper cover 502 are reconnected, and after the material receiving assembly 5 is sealed, the vacuum valve 603 and the second exhaust valve 506 are opened to evacuate the gas again, and then steps S4-S6 are repeated until the pouring of the concrete in the mixing barrel 1 is completed; S7, open the first exhaust valve 205 to release the vacuum state, and restore the normal pressure in the mixing barrel 1 to make it easy to separate the sealing cover 2. Then fill water to clean the mixing barrel 1, open the discharge valve 402 to discharge the residual concrete from the discharge pipe 401, so as to prevent the concrete from solidifying in the mixing barrel 1.

[0029] In summary, the present invention provides a fully sealed vacuum concrete mixing and pouring device, the working principle of which is to achieve air isolation in the entire process from mixing, conveying to pouring through a sealed structure and a vacuum environment. Concrete mixing is carried out in a fully enclosed mixing barrel, and air is extracted through a vacuum system. The concrete is transported to the pouring position through a sealed pipe. The vacuum environment is maintained during the entire conveying process. The pouring operation is carried out in a sealed material receiving assembly to ensure that the concrete fills the mold under a vacuum state, thereby solving the limitation that the current concrete preparation process only draws a vacuum during the mixing stage. According to the preparation method of the present invention, when preparing, in particular, precast concrete parts, the vacuum-mixed concrete is poured into a sealed material receiving assembly, and the air contained in the precast concrete parts to be produced is reduced to a large extent by effectively removing the bubbles in advance, thereby effectively solving the problem of deterioration of the strength of the concrete structure due to residual bubbles.

[0030] The above describes in detail the specific implementation modes of the present invention in conjunction with the accompanying drawings, but the present invention is not limited to these descriptions. Various modifications, substitutions and improvements can be made within the knowledge scope of ordinary technicians in this field without departing from the principle of the present invention.

Claims

1. A device for mixing and pouring concrete under vacuum conditions, characterized in that: include: A mixer body, a pouring device, and a vacuum pump system; the mixer body comprises a mixing barrel (1) and a sealing cover (2) matched therewith, a mixing assembly (3) is arranged at the axis center of the sealing cover (2), the pouring device is connected below the mixer body, and the vacuum pump system (6) comprises a vacuum pump (601), a vacuum hose (602), and a vacuum valve (603), one end of the vacuum hose (602) is connected to the vacuum valve (603), and the other end is respectively connected to the mixer body and the pouring device.

2. The device for mixing and pouring concrete under vacuum conditions according to claim 1, characterized in that: The outer surface of the sealing cover (2) is penetrated by a first exhaust port (201), a vacuum gauge (202), and a water inlet (204); the first exhaust port (201) is connected to a first exhaust valve (205); and the first exhaust valve (205) is connected to a vacuum valve (603) via a vacuum hose (602).

3. The device for mixing and pouring concrete under vacuum conditions according to claim 2, characterized in that: The outer surface of the sealing cover (2) is also provided with an observation window (203) and a handle (206).

4. The device for mixing and pouring concrete under vacuum conditions according to claim 1, characterized in that: The pouring equipment comprises a discharge assembly (4) and a material receiving assembly (5); the discharge assembly (4) comprises a discharge pipe (401) and a discharge valve (402) mounted thereon; the discharge pipe (401) is mounted directly below the mixing barrel (1); the material receiving assembly (5) is connected directly below the discharge assembly (4) and is connected to a vacuum pump system (6).

5. The device for mixing and pouring concrete under vacuum conditions according to claim 1, characterized in that: A flange (101) is provided at the connection between the top edge of the mixing barrel (1) and the sealing cover (2); a matching first bolt hole (102) is provided on the flange (101); the sealing cover (2) is fixed to the mixing barrel (1) by bolts (103); an annular sealing groove (104) is provided on the flange (101); a mixing barrel sealing ring (105) is installed in the annular sealing groove (104); and four supporting legs (106) are fixedly connected to the lower surface of the mixing barrel (1).

6. The device for mixing and pouring concrete under vacuum conditions according to claim 1, characterized in that: The stirring assembly (3) comprises a stirring motor (301), a stirring shaft (302), and a stirring blade (303); the stirring motor (301) is sealed and fixedly mounted on the outer surface of the shaft center of the sealing cover (2); the stirring shaft (302) passes through the sealing cover (2) and is fixedly connected to the output end of the motor (301); and the stirring blade (303) is fixedly connected to the outer surface of the stirring shaft (302).

7. The device for mixing and pouring concrete under vacuum conditions according to claim 4, characterized in that: The material receiving assembly (5) comprises an open cubic steel mold (501) and a detachable steel mold upper cover (502); a first material receiving port (503) and a second exhaust port (504) are provided on the top of the steel mold upper cover (502); the first material receiving port (503) is connected to the discharge pipe (401); the second exhaust port (504) is connected to a second exhaust valve (506); and the second exhaust valve (506) is connected to the vacuum valve (603) via a vacuum hose (602).

8. The device for mixing and pouring concrete under vacuum conditions according to claim 7, characterized in that: The cubic steel mold (501) and the steel mold upper cover (502) are provided with a first flange (507) extending horizontally outward, and a matching second bolt hole (508) and a steel mold sealing ring (505) are provided at a corresponding position of the first flange (507), and the steel mold upper cover 502 is fixed to the cubic steel mold 501 by passing bolts through the steel mold sealing ring 505.

9. The device for mixing and pouring concrete under vacuum conditions according to claim 4, characterized in that: The material receiving assembly (5) comprises a vacuum container (7), a concrete mold (701), and a coverless material baffle plate (702); the vacuum container (7) comprises a container formed by welding a bottom plate, four side plates, and a sealing plate (703); the concrete mold (701) is placed inside the vacuum container (7); the coverless material baffle plate (702) is provided with a horizontally extending convex plate, and is placed above the concrete mold (701); a second material receiving port (707) is provided in the middle of the sealing plate (703); a third exhaust port (708) is provided at a corner; the material receiving port (708) is connected to a discharge pipe (401); and the third exhaust port (708) is connected to a vacuum hose (602).

10. The device for mixing and pouring concrete under vacuum conditions according to claim 9, characterized in that: The vacuum container (7) is provided with a second flange (704), each side of the second flange (704) is provided with a bolt hole, the sealing plate (703) is provided with bolt holes corresponding to the bolt holes of the second flange (704), and the bolts are fastened by passing through the corresponding bolt holes, the second flange (704) is provided with a sealing strip (705), four fixing parts (706) are provided on the bottom plate, and the second material receiving port (707) is connected to the discharge pipe (401) by threaded sealing.

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