UHPC premix spiral conveying mechanism

Abstract

The utility model provides a UHPC premix spiral conveying mechanism which comprises a conveying box, a plurality of conveying rods and a driving device, and a feeding hopper installed on the top face and a discharging opening formed in the bottom face are further arranged at the two ends of the conveying box respectively. The multiple conveying rods are rotationally connected into the conveying box in the length direction of the conveying box and are adjacent to one another. The driving device is used for driving the conveying rods to rotate; the conveying rod is further divided into a conveying area and a stirring area, and the outer side, located in the conveying area, of the conveying rod is continuously and circumferentially wound with a spiral piece; stirring rods are circumferentially arranged on the outer side, located in the stirring area, of the conveying rod; the plurality of spiral sheets and the stirring rod are mutually matched to rotate. When the premixed concrete is conveyed through the conveying box, the premixed concrete can be pushed by the spiral piece in the conveying area to pass through the stirring area, and the stirring rods in the stirring area stir and mix the premixed concrete again, so that the distribution of steel fibers is disrupted, the isotropy of the steel fibers is reduced, and the condition of homodromous segregation of the concrete is reduced.

Description

Technical Field

[0001] The utility model relates to the field of concrete pretreatment, in particular to a spiral conveying mechanism for UHPC premix. Background Art

[0002] Ultra-high performance concrete (referred to as UHPC) is a super-high strength cement-based material with high strength, high toughness and low porosity. Its basic preparation principle is: by improving the fineness and activity of the tissue components, without using coarse aggregate, to minimize the pores and microcracks inside the material, so as to obtain ultra-high strength and high durability. "Ultra-high performance concrete" has ultra-high durability and ultra-high mechanical properties. Due to its light weight and reliable performance, it has broad application prospects in construction engineering and national defense engineering.

[0003] Since a large amount of steel fibers are added during the mixing of UHPC, the fluidity of the material after mixing is relatively poor. In today's transportation process, whether it is transported by a spiral conveyor or a crawler conveyor, it is easy to cause the same-directionality of the steel fiber distribution and easy to cause concrete segregation in the same direction. Summary of the Utility Model

[0004] In order to reduce the situation of concrete segregation in the same direction, the present application provides a spiral conveying mechanism for UHPC premix.

[0005] The spiral conveying mechanism for UHPC premix provided by the present application adopts the following technical solutions:

[0006] A spiral conveying mechanism for UHPC premix includes a transportation box, a plurality of transportation rods and a driving device. Feed hoppers are respectively arranged at both ends of the transportation box on the top surface, and discharge ports are opened at the bottom surface; a plurality of the transportation rods are rotatably connected in the transportation box along the length direction of the transportation box and are arranged adjacent to each other; the driving device is used to drive the plurality of transportation rods to rotate; the transportation rods are also divided into a transportation area and a stirring area. Spiral blades are continuously wound around the outside of the transportation rods in the transportation area in a circumferential direction; stirring rods are arranged circumferentially on the outside of the transportation rods in the stirring area; the plurality of spiral blades and the stirring rods cooperate with each other to rotate.

[0007] Through the above technical solutions, when the premixed concrete is conveyed through the transportation box, it will pass through the stirring area under the push of the spiral blades in the transportation area, and the stirring rods in the stirring area will stir and mix the premixed concrete again, so as to disrupt the steel fiber distribution, reduce the same-directionality of the steel fibers, and thus reduce the situation of concrete segregation in the same direction.

[0008] Preferably, the stirring rods are in a C shape, and both ends of the C shape are fixed on the transportation rods.

[0009] Through the above technical solution, the C-shaped stirring rod has a through hole in the middle, allowing the mixed material to pass through, thereby forming a more complex flow direction in the stirring zone to increase the degree of disorder in the distribution of steel fibers, thereby better reducing the isotropy of the steel fibers.

[0010] Preferably, the driving device comprises a plurality of reduction motors, and output ends of the plurality of reduction motors are connected one by one to a plurality of transport rods.

[0011] Through the above technical scheme, the difference in transport speed of the transport rod caused by the different speeds of the reduction motor is utilized to squeeze and stagger the mixed materials in the transport area, further increase the degree of disorder in the distribution of steel fibers, and reduce the situation where the mixed materials adhere to each other and form lumps during transportation.

[0012] Preferably, a plurality of water injection pipes are installed on the top surface of the transport box along the length direction of the transport box, and the plurality of water injection pipes are connected to the internal space of the transport box and correspond to the inside and outside of the stirring zone one by one.

[0013] Through the above technical solution, in the actual use process, the mixed material is prone to sedimentation during transportation. However, by arranging a water injection pipe in the stirring area, the impact of the water flow and the stirring of the stirring rod are utilized to fully re-mix the mixed material and reduce sedimentation.

[0014] Preferably, the water injection amounts of the plurality of water injection pipes decrease successively from the feed hopper to the discharge port.

[0015] Through the above technical solution, by controlling the decrease of the water injection amount, the mixture is gradually and evenly mixed with water during the transportation process, avoiding local over-wetting or over-drying, thereby improving the uniformity and quality of the mixture.

[0016] Preferably, the transport box consists of a U-shaped groove, a top plate and two rotating cover plates, the top plate is fixed on the top surface of the U-shaped groove, a plurality of water injection pipes are installed on the top surface, one end of the two rotating cover plates are respectively hinged on the side walls of the U-shaped groove, and the other ends are respectively fitted with two sides of the top plate, and a sealing strip is also provided between the rotating cover plate and the top plate.

[0017] Through the above technical solution, the design of the rotating cover plate facilitates the operator to clean and repair the inside of the transport box, and the design of the sealing strip prevents the leakage of mixed materials during work.

[0018] Preferably, the transport box is arranged adjacent to a plurality of transport rods on four sides.

[0019] Through the above technical solution, the design of the transport box being close to the transport rods on all four sides reduces the conveying dead angles, thereby reducing the situation where mixed materials accumulate in the transport box.

[0020] The technical effects of this utility model are mainly reflected in the following aspects:

[0021] 1. The utility model disrupts the distribution of steel fibers and reduces the isotropic nature of steel fibers by designing a mixing zone, thereby reducing the isotropic segregation of concrete;

[0022] 2. The utility model designs the stirring rod into a C-shape. Since a through hole is opened in the middle of the C-shaped stirring rod, the mixed material is allowed to pass through, thereby forming a more complex flow direction in the stirring zone to increase the degree of disorder of the steel fiber distribution, thereby better reducing the isotropy of the steel fiber;

[0023] 3. The utility model designs a water injection pipe and utilizes the impact of water flow and the stirring of a stirring rod to fully remix the mixed materials and reduce sedimentation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0025] Figure 2 This is a schematic diagram of the structure of the transport rod according to an embodiment of the present application.

[0026] Figure numerals: 1. transport box; 11. feed hopper; 12. discharge port; 13. U-shaped groove; 14. top plate; 15. rotating cover plate; 2. transport rod; 21. transport area; 22. stirring area; 23. spiral blade; 24. stirring rod; 3. reduction motor; 4. water injection pipe. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1-2 , the specific implementation methods of the utility model are further described in detail to make the technical solution of the utility model easier to understand and grasp.

[0028] The present application embodiment discloses a UHPC premix screw conveying mechanism:

[0029] Reference Figure 1-2, a spiral conveying mechanism for UHPC premix, comprising a transport box 1, two transport rods 2 and a driving device. At both ends of the transport box 1, a feed hopper 11 installed on the top surface and a discharge port 12 opened on the bottom surface are respectively provided; the two transport rods 2 are rotatably connected in the transport box 1 along the length direction of the transport box 1 and are arranged adjacent to each other; the driving device is used to drive the two transport rods 2 to rotate; the transport rods 2 are also divided into a transport area 21 and a stirring area 22, and spiral blades 23 are continuously wound around the outer side of the transport rods 2 in the transport area 21; stirring rods 24 are circumferentially fixed on the outer side of the transport rods 2 in the stirring area 22; a number of spiral blades 23 and stirring rods 24 cooperate with each other to rotate. When the premixed concrete is conveyed through the transport box 1, it will pass through the stirring area 22 under the push of the spiral blades 23 in the transport area 21, and the stirring rods 24 in the stirring area 22 will stir the premixed concrete again to mix the material, thereby disrupting the distribution of steel fibers, reducing the isotropy of steel fibers, and thus reducing the situation of concrete segregation in the same direction.

[0030] Refer to Figure 2 , the stirring rod 24 is in a C shape, and both ends of the C shape are fixed on the transport rod 2. Due to the through hole provided in the middle of the C-shaped stirring rod 24, the mixed material is allowed to pass through, thereby forming a more complex flow direction in the stirring area 22 to provide the degree of disorder of the steel fiber distribution, and thus better reducing the isotropy of steel fibers.

[0031] Refer to Figure 1 , the driving device includes two reduction motors 3, and the output ends of the two reduction motors 3 are respectively connected to the two transport rods 2. By using the difference in the transport speed of the transport rods 2 brought about by the different rotation speeds of the reduction motors 3, the mixed materials are mutually extruded and staggered in the transport area 21, further improving the degree of disorder of the steel fiber distribution and reducing the situation of the mixed materials sticking together to form lumps during the transport process.

[0032] Refer to Figure 1 , three water injection pipes 4 are also installed on the top surface of the transport box 1 along the length direction of the transport box 1. The three water injection pipes 4 are communicated with the internal space of the transport box 1 and are correspondingly arranged inside and outside with the stirring area 22 one by one. In the specific use process, the mixed material is also prone to sedimentation during the transport process. By arranging the water injection pipes 4 in the stirring area 22, the impact of the water flow and the stirring of the stirring rods 24 are used to make the mixed material fully mixed again and reduce the sedimentation situation. At the same time, the C-shaped stirring plate allows part of the material to pass through during stirring, forming a more complex flow direction in the stirring area 22, and finally further improving the uniformity and fineness of stirring.

[0033] The water injection amounts of the three water injection pipes 4 decrease sequentially from the feed hopper 11 to the discharge port 12 direction. By controlling the decreasing water injection amount, the mixed material is gradually and evenly mixed with water during the conveying process, avoiding the situation of local over-wetting or over-drying, thereby improving the uniformity and quality of the mixed material.

[0034] Reference Figure 1 As shown in Figure 1 , the transport box 1 is composed of a U-shaped groove 13, a top plate 14 and two rotating cover plates 15. The top plate 14 is fixed on the top surface of the U-shaped groove 13. Three water injection pipes 4 are installed on the top surface. One end of each of the two rotating cover plates 15 is hinged to the side wall of the U-shaped groove 13, and the other end is respectively attached to both sides of the top plate 14. A sealing strip is also fixed between the rotating cover plate 15 and the top plate 14. The design of the rotating cover plate 15 facilitates the operator to clean and repair the inside of the transport box 1. At the same time, the design of the sealing strip avoids the situation of mixed materials leaking out during work. At the same time, the four sides of the transport box 1 are closely adjacent to two transport rods 2. The design that the four sides of the transport box 1 are closely adjacent to the transport rods 2 reduces the conveying dead angle, thereby reducing the situation of mixed materials accumulating in the transport box 1.

[0035] Of course, the above are only typical examples of the present invention. In addition, the present invention can also have many other specific implementation manners. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A UHPC premix screw conveying mechanism, characterized in that: The invention comprises a transport box (1), a plurality of transport rods (2) and a driving device, wherein the two ends of the transport box (1) are respectively provided with a feed hopper (11) installed on the top surface and a discharge port (12) opened on the bottom surface; the plurality of transport rods (2) are rotatably connected in the transport box (1) along the length direction of the transport box (1) and are arranged closely to each other; the driving device is used to drive the plurality of transport rods (2) to rotate; the transport rod (2) is further divided into a transport area (21) and a stirring area (22); the transport rod (2) is located outside the transport area (21) and is continuously circumferentially wound with a spiral sheet (23); the transport rod (2) is located outside the stirring area (22) and is circumferentially provided with a stirring rod (24); the plurality of spiral sheets (23) and the stirring rod (24) rotate in coordination with each other.

2. A UHPC premix screw conveying mechanism according to claim 1, characterized in that: The stirring rod (24) is C-shaped, and both ends of the C-shaped rod are fixed on the transport rod (2).

3. A UHPC premix screw conveying mechanism according to claim 1, characterized in that: The driving device comprises a plurality of reduction motors (3), the output ends of the plurality of reduction motors (3) are connected one by one to a plurality of transport rods (2), and the rotation speeds of the reduction motors (3) are different from each other.

4. A UHPC premix screw conveying mechanism according to claim 1, characterized in that: A plurality of water injection pipes (4) are also installed on the top surface of the transport box (1) along the length direction of the transport box (1); the plurality of water injection pipes (4) are connected to the internal space of the transport box (1) and correspond to the stirring zones (22) one by one inside and outside.

5. A UHPC premix screw conveying mechanism according to claim 4, characterized in that: The water injection amounts of the plurality of water injection pipes (4) decrease in sequence from the feed hopper (11) toward the discharge port (12).

6. A UHPC premix screw conveying mechanism according to claim 4, characterized in that: The transport box (1) is composed of a U-shaped groove (13), a top plate (14) and two rotating cover plates (15); the top plate (14) is fixed on the top surface of the U-shaped groove (13); a plurality of water injection pipes (4) are installed on the top surface; one end of the two rotating cover plates (15) is respectively hinged on the side wall of the U-shaped groove (13); the other end is respectively fitted with the two sides of the top plate (14); and a sealing strip is also provided between the rotating cover plate (15) and the top plate (14).

7. The UHPC premix screw conveying mechanism according to claim 1, characterized in that: The transport box (1) is arranged adjacent to a plurality of transport rods (2) on four sides.

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