A mixer and method for producing UHPC premix

Abstract

This invention relates to the field of UHPC premix production technology, specifically to a mixer and method for producing UHPC premixes. The mixer includes a mixing cylinder, a feeding cylinder with a rotating rod and spiral feeding blades inside, a rotating gear fixed to the outer wall of the rotating rod, and a first drive gear at the top of the mixing cylinder. The invention uses the spiral feeding blades to convey materials upwards and discharge them through a first outlet to the bottom, then conveys them again, repeating this process for mixing. During the mixing process, the spiral feeding blades effectively disperse the materials, preventing clumping. After mixing for a period of time, an electric cylinder can pull the blocking cylinder upwards, causing the fourth outlet to coincide with the second outlet and the first and third outlets to be misaligned. Furthermore, by driving the spiral feeding blades upwards, samples can be fed into a sampling tube via the spiral feeding blades, enabling rapid determination of whether the internal materials are uniformly mixed.

Description

Technical Field

[0001] The invention relates to the technical field of UHPC premixes, in particular to a mixer and a method for producing UHPC premixes. Background Art

[0002] When preparing ultra-high performance concrete (UHPC) premix, the raw materials are first weighed and proportioned, and then mixed using a dry mixing method.

[0003] Existing UHPC mixers generally use a stirring shaft to stir the premix, but this stirring and mixing method is inefficient, and there are agglomerates of micro-nano particles of different particle sizes and types in the premix, which cannot be completely broken up by stirring using the above stirring structure, which also leads to unsatisfactory mixing effects. To this end, the present invention develops a mixer for producing UHPC premix and a method thereof to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide a mixer and a method for producing UHPC premix, which can efficiently mix the UHPC premix and break up agglomerates during the mixing process.

[0005] To achieve the above object, the first technical solution provided by the present invention is:

[0006] A mixer for producing UHPC premix, comprising a mixing barrel with a conical bottom, and the bottom of the mixing barrel is connected to a discharge pipe, a feeding barrel with two ends passing through is installed on the top of the inner cavity of the mixing barrel, the top of the feeding barrel passes through the top of the mixing barrel, and a distance is provided between the bottom of the feeding barrel and the bottom of the inner cavity of the mixing barrel, a first discharge port and a second discharge port are opened on the side wall of the feeding barrel, the first discharge port is located inside the mixing barrel and close to the top of the inner cavity of the mixing barrel, the second discharge port is located outside the mixing barrel and is connected to a sampling tube, an electric cylinder is installed on the top of the mixing barrel through a support frame, and the electric cylinder The output end of the cylinder is rotatably connected to a rotating rod, and a spiral feeding blade is provided on the outer wall of the rotating rod, and the spiral feeding blade is located inside the feeding barrel and the discharge pipe. The rotating rod is rotatably connected to a blocking barrel with an opening at the bottom, and a third discharge port and a fourth discharge port that cooperate with the first discharge port and the second discharge port are provided on the side wall of the blocking barrel. A rotating gear column is fixedly connected to the outer wall of the rotating rod, and a driving motor is fixedly connected to the top of the mixing barrel. The output end of the driving motor is fixedly connected to a first driving gear that meshes with the rotating gear column, and an openable cover plate assembly is rotatably connected to the bottom of the rotating rod.

[0007] Preferably, the cover plate assembly includes an internally hollow fixing ring, two internally hollow sliding blocks are symmetrically arranged on the side walls of the fixing ring, a sliding groove cooperating with the sliding block is opened on the side walls of the inner cavity of the discharge pipe, a cover plate is rotatably connected between the inner walls of the fixing ring, both ends of the rotating shaft of the cover plate are inserted into the inner cavities of the two sliding blocks and fixedly connected with a rotating gear, an extrusion rod is slidably connected to the bottom of the sliding block, and one end of the extrusion rod is inserted into the inner cavity of the sliding block and is provided with a rack meshing with the rotating gear, when the sliding block slides to the bottom of the sliding groove, it pushes the rack to slide and drives the rotating gear to rotate, and two obliquely arranged mounting rods are fixedly connected to the top of the fixing ring, and the mounting rods are rotatably connected to the rotating rod.

[0008] Preferably, a spring connected to the rack is provided at the top of the inner cavity of the slider.

[0009] Preferably, the feeding barrel comprises a first barrel, a second barrel and a third barrel that are rotatably connected in sequence, and the third barrel is fixedly connected to the bottom of the inner cavity of the mixing barrel through a support rod, the first discharge port is opened on the outer wall of the second barrel, the second discharge port is opened on the outer wall of the first barrel, a driven gear is fixedly connected to the outer wall of the second barrel, the driving motor is a double-headed motor, one output end of the driving motor is connected to the first driving gear, the other output end of the driving motor passes through the top of the mixing barrel and is equipped with a second driving gear meshing with the driven gear, the blocking barrel comprises a lower connecting part and an upper connecting part that are rotatably connected, the third discharge port is opened on the side wall of the lower connecting part, the fourth discharge port is opened on the side wall of the upper connecting part, and the lower connecting part is slidably connected to the inner wall of the second barrel.

[0010] Preferably, the inner wall of the second cylinder is provided with limit strips at equal angles, and the outer wall of the lower connecting part is provided with limit grooves which cooperate with the limit strips.

[0011] Preferably, a conical material guide plate is provided on the outer wall of the second cylinder, and the conical material guide plate is located below the first material outlet.

[0012] Preferably, a slide bar with a T-shaped cross section is provided at the top of the lower connecting portion, and an annular groove matched with the slide bar is provided at the bottom of the upper connecting portion.

[0013] Preferably, an inner gear ring meshing with the second driving gear is rotatably connected to the top of the inner cavity of the mixing cylinder, a plurality of fixing rods are fixedly connected at equal angles to the bottom of the inner gear ring, and a stirring rod is installed on one side of the fixing rod.

[0014] Preferably, the stirring rod and the fixed rod are hingedly connected to each other, the outer wall of the third cylinder is threadedly connected to a reciprocating threaded sleeve, the stirring rod and the reciprocating threaded sleeve are hinged to each other, the stirring rod is composed of four connecting rods hinged in sequence, and the free ends of the first and last connecting rods are respectively hinged to the fixed rod and the reciprocating threaded sleeve.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. When mixing UHPC premixes, the present invention can convey materials upward through spiral feeding blades and discharge them from the first discharge port to the bottom, and then convey them again, and mix them reciprocatingly. In the mixing process, the materials can be fully dispersed to avoid agglomeration through the conveying of the spiral feeding blades. At the same time, after the materials are mixed for a period of time, the blocking barrel can be pulled up by the electric cylinder, so that the fourth discharge port coincides with the second discharge port, and the first discharge port and the third discharge port are misaligned. The spiral feeding blades can be driven to rise, so that the spiral feeding blades can be used to feed materials into the sampling tube to achieve sampling, so that it can quickly determine whether the internal materials are mixed evenly, and sampling in the dynamic process makes the samples obtained more random and the subsequent judgment more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of the mixer of the present invention;

[0019] Figure 2 It is a schematic diagram of the front cross-section structure of the mixer of the present invention;

[0020] Figure 3 for Figure 2 A schematic diagram of the structure enlargement at the center A;

[0021] Figure 4 It is a schematic diagram of the exploded structure of the screw feeder and its connecting parts in the mixer of the present invention;

[0022] Figure 5 for Figure 4 Schematic diagram of the cross-section structure;

[0023] Figure 6 for Figure 5 A magnified schematic diagram of the structure at point B in the middle.

[0024] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0025] 1. Mixing barrel; 2. Discharge pipe; 201. Slide; 3. Feeding barrel; 31. First barrel; 32. Second barrel; 33. Third barrel; 34. Driven gear; 35. Limiting strip; 36. Conical guide plate; 4. First discharge port; 5. Second discharge port; 6. Sampling tube; 7. Electric cylinder; 8. Rotating rod; 9. Spiral feeding blade; 10. Blocking barrel; 101. Lower connecting part; 1011. Limiting slot; 102. Upper connecting part; 103. Slide ; 104, annular groove; 11, third discharge port; 12, fourth discharge port; 13, rotating gear column; 14, driving motor; 15, first driving gear; 16, cover assembly; 161, fixing ring; 162, slider; 163, cover; 164, rotating gear; 165, extrusion rod; 166, mounting rod; 167, spring; 17, second driving gear; 18, inner gear ring; 19, fixing rod; 20, stirring rod; 21, reciprocating threaded sleeve. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] like Figure 1-6 As shown: One embodiment of the present invention is:

[0028] A mixer for producing UHPC premix, comprising a mixing barrel 1 with a conical bottom, and a discharge pipe 2 is connected to the bottom of the mixing barrel 1, a feeding barrel 3 with two ends passing through is installed on the top of the inner cavity of the mixing barrel 1, the top of the feeding barrel 3 passes through the top of the mixing barrel 1, and a distance is arranged between the bottom of the feeding barrel 3 and the bottom of the inner cavity of the mixing barrel 1, a first discharge port 4 and a second discharge port 5 are opened on the side wall of the feeding barrel 3, the first discharge port 4 is located inside the mixing barrel 1 and close to the top of the inner cavity of the mixing barrel 1, the second discharge port 5 is located outside the mixing barrel 1 and is connected to a sampling tube 6, an electric cylinder 7 is installed on the top of the mixing barrel 1 through a support frame, and the output end of the electric cylinder 7 rotates It is rotatably connected with a rotating rod 8, and a spiral feeding blade 9 is arranged on the outer wall of the rotating rod 8, and the spiral feeding blade 9 is located inside the feeding cylinder 3 and the discharge pipe 2. The rotating rod 8 is rotatably connected with a blocking cylinder 10 with an opening at the bottom, and a third discharge port 11 and a fourth discharge port 12 which cooperate with the first discharge port 4 and the second discharge port 5 are arranged on the side wall of the blocking cylinder 10. A rotating gear column 13 is fixedly connected to the outer wall of the rotating rod 8, and a driving motor 14 is fixedly connected to the top of the mixing cylinder 1, and a first driving gear 15 which meshes with the rotating gear column 13 is fixedly connected to the output end of the driving motor 14, and an openable cover assembly 16 is rotatably connected to the bottom of the rotating rod 8.

[0029] In this embodiment, in order to realize that the cover assembly can be opened automatically, the cover assembly 16 includes an internally hollow fixed ring 161, and two internally hollow sliders 162 are symmetrically arranged on the side wall of the fixed ring 161. A slide groove 201 that cooperates with the slider 162 is opened on the side wall of the inner cavity of the discharge pipe 2. A cover plate 163 is rotatably connected between the inner walls of the fixed ring 161. Both ends of the rotating shaft of the cover plate 163 are inserted into the inner cavities of the two sliders 162 and fixedly connected with a rotating gear 164. An extrusion rod 165 is slidably connected to the bottom of the slider 162, and one end of the extrusion rod 165 is inserted into the inner cavity of the slider 162 and is provided with a rack meshing with the rotating gear 164. The slider 162 slides into the slide groove. When the mixing is completed, the cover assembly can be pushed to slide downward along the slide groove by the electric cylinder, so that the extrusion rod gradually contacts the bottom of the slide groove and slides upward, thereby driving the rotating gear and the cover plate to rotate through the rack, and finally realizing the automatic opening of the cover assembly for discharging. In order to avoid the accumulation of materials on the top of the fixed ring, the top of the fixed ring is provided with a downward inclined shape.

[0030] In this embodiment, in order to make the material evenly fall to the bottom of the mixing barrel when discharged from the first discharge port, the feeding barrel 3 includes a first barrel 31, a second barrel 32 and a third barrel 33 which are rotatably connected in sequence, and the third barrel 33 is fixedly connected to the bottom of the inner cavity of the mixing barrel 1 through a support rod, the first discharge port 4 is opened on the outer wall of the second barrel 32, the second discharge port 5 is opened on the outer wall of the first barrel 31, the outer wall of the second barrel 32 is fixedly connected with a driven gear 34, the driving motor 14 is a double-headed motor, one output end of the driving motor 14 is connected with a first driving gear 15, and the other output end of the driving motor 14 passes through the top of the mixing barrel 1 and is installed with a second driving gear 17 meshing with the driven gear 34;

[0031] The blocking barrel 10 includes a lower connecting part 101 and an upper connecting part 102 which are rotatably connected. The third discharge port 11 is opened on the side wall of the lower connecting part 101, and the fourth discharge port 12 is opened on the side wall of the upper connecting part 102. The lower connecting part 101 is slidably connected to the inner wall of the second cylinder 32. The inner wall of the second cylinder 32 is provided with limit strips 35 at equal angles. The outer wall of the lower connecting part 101 is provided with limit grooves 1011 which cooperate with the limit strips 35. A slide bar 103 with a T-shaped cross-section is arranged on the top of the lower connecting part 101, and an annular groove 104 matched with the slide bar 103 is arranged on the bottom of the upper connecting part 102. The rotation of the double-headed motor can drive the second cylinder to rotate, so that the first discharge port can discharge the material 360 degrees when discharging the material, making the discharge more uniform, and the first cylinder and the second cylinder are arranged as a relatively rotating structure, so that the angle of the first cylinder can be kept fixed when the second cylinder rotates, so that the position of the sampling tube will not rotate.

[0032] In this embodiment, in order to make the material discharged from the first discharge port more dispersed, a conical material guide plate 36 is provided on the outer wall of the second cylinder 32, and the conical material guide plate 36 is located below the first discharge port 4, wherein the material first falls on the conical material guide plate when being discharged, and then the conical gear guide plate rotates to cause the material to produce a centrifugal effect, making the material discharge more dispersed.

[0033] In this embodiment, in order to further stir the falling materials, an internal gear ring 18 meshing with the second driving gear 17 is rotatably connected to the top of the inner cavity of the mixing barrel 1, and a plurality of fixed rods 19 are fixedly connected at equal angles to the bottom of the internal gear ring 18. A stirring rod 20 is installed on one side of the fixed rod 19, and the stirring rod 20 and the fixed rod 19 are hingedly connected to each other. A reciprocating threaded sleeve 21 is threadedly connected to the outer wall of the third barrel 33, and the stirring rod 20 and the reciprocating threaded sleeve 21 are hinged to each other. The stirring rod 20 is composed of four connecting rods hinged in sequence, and the free ends of the first and last connecting rods are hinged to the fixed rod 19 and the reciprocating threaded sleeve 21 respectively. The second driving gear can drive the fixed rod and the stirring rod to rotate, thereby driving the reciprocating threaded sleeve to slide back and forth up and down on the outer wall of the third barrel. Since the stirring rod is hingedly composed of four connecting rods, the stirring rod can be deformed in real time during the up and down sliding process of the reciprocating threaded sleeve, so that the stirring rod can stir the raw materials at different positions, so that the mixing of the raw materials is more uniform.

[0034] In this embodiment, in order to adapt to the diameter of the blocking barrel and make the transportation of raw materials smoother, a chamfer is provided at the bottom of the blocking barrel, and the diameter of the part of the bolt feeder located in the blocking barrel is smaller than the diameter of the second barrel part.

[0035] In this embodiment, a feed hopper (not shown in the figure) is arranged on the top of the mixing cylinder 1.

[0036] The specific working process of this embodiment is as follows:

[0037] When the UHPC premix is ​​mixed, the raw materials of the premix are added into the mixing drum 1 through the feed hopper, and then the driving motor 14 (double-headed motor) is started to drive the first driving gear 15 and the second driving gear 17 to rotate, and respectively drive the rotating gear column 13 and the driven gear 34 to rotate, thereby driving the spiral feeding blade 9 and the second barrel 32 to rotate, wherein the spiral feeding blade 9 rotates to transport the raw materials at the bottom of the mixing drum 1 upward, and mixes while transporting, and then discharged from the connected third discharge port 11 and the first discharge port 4 and falls on the conical guide plate 36, and the conical guide plate 36 rotates to throw the materials out and fall again on the bottom of the mixing drum 1, and the materials are mixed reciprocatingly;

[0038] At the same time, during the mixing process, the second driving gear 17 can synchronously drive the inner gear ring 18 to rotate, thereby driving the fixed rod 19 to rotate around the outside of the second cylinder 32 and the third cylinder 33, and driving the reciprocating threaded sleeve 21 to rotate through the stirring rod 20, so that the reciprocating threaded sleeve 21 can slide back and forth up and down along the outer wall of the third cylinder 33, so that the four connecting rods driving the stirring rod 20 are deformed, so that the stirring rod 20 can stir the raw materials at different positions during the rotation process, further improving the mixing effect.

[0039] After mixing for a period of time, the electric cylinder 7 is started, and the electric cylinder 7 pulls the rotating rod 8, the spiral feeding blade 9 and the blocking barrel 10 to slide upward synchronously, so that the side wall below the blocking barrel 10 blocks the first discharge port 4, and the fourth discharge port 12 is connected with the second discharge port 5, so that the raw materials can flow out from the sampling tube 6 after being transported upward (the sampling tube is L-shaped, and the horizontal end of the sampling tube 6 is obliquely connected to the first barrel 31 and extends out of the side of the mixing barrel 1, and the bent end of the sampling tube 6 is set downward) for random dynamic sampling, and the staff determines whether the mixing effect meets the requirements. After the sampling is completed, the spiral feeding blade 9 and the blocking barrel 10 are slid downward again through the electric cylinder 7, so that the third discharge port 11 is connected with the first discharge port 4 again, and mixing is carried out again.

[0040] When the electric cylinder 7 drives the blocking barrel 10 to slide upward for sampling, the rotating rod 8 can also synchronously drive the cover plate assembly 16 to slide upward, so that part of the material that falls into the discharge pipe 2 can be pushed upward and cover the top of the discharge pipe 2, avoiding accumulation in the discharge pipe 2 and affecting subsequent mixing;

[0041] After the materials are mixed, the electric cylinder 7 is started, and the electric cylinder 7 lowers the rotating rod 8, the spiral feeding blade 8 and the cover assembly 16, so that the extrusion rod 165 of the cover assembly 16 contacts the bottom of the chute 201 and slides, and drives the rotating gear 164 and the cover 163 to rotate through the rack, so that the cover 163 flips 90 degrees to open the cover assembly 16, and then the double-headed motor is started in reverse to make the spiral feeding blade 9 rotate in the reverse direction, so that the material in the mixing barrel 1 is transported in the reverse direction to the discharge pipe 2 to realize discharging.

[0042] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0043] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mixer for producing UHPC premix, characterized in that: The invention comprises a mixing barrel (1) having a conical bottom, wherein the bottom of the mixing barrel (1) is connected to a discharge pipe (2), a feeding barrel (3) with two ends passing through is installed at the top of the inner cavity of the mixing barrel (1), the top of the feeding barrel (3) passes through the top of the mixing barrel (1), and a distance is provided between the bottom of the feeding barrel (3) and the bottom of the inner cavity of the mixing barrel (1), a first discharge port (4) and a second discharge port (5) are opened on the side wall of the feeding barrel (3), the first discharge port (4) is located inside the mixing barrel (1) and close to the top of the inner cavity of the mixing barrel (1), the second discharge port (5) is located outside the mixing barrel (1) and is connected to a sampling pipe (6), an electric cylinder (7) is installed at the top of the mixing barrel (1) through a support frame, and the output end of the electric cylinder (7) is rotatably connected to a rotating rod (8) The outer wall of the rotating rod (8) is provided with a spiral feeding blade (9), and the spiral feeding blade (9) is located inside the feeding cylinder (3) and the discharge pipe (2). The rotating rod (8) is rotatably connected to a blocking cylinder (10) with an opening at the bottom. The side wall of the blocking cylinder (10) is provided with a third discharge port (11) and a fourth discharge port (12) that cooperate with the first discharge port (4) and the second discharge port (5). The outer wall of the rotating rod (8) is fixedly connected to a rotating gear column (13). The top of the mixing cylinder (1) is fixedly connected to a driving motor (14). The output end of the driving motor (14) is fixedly connected to a first driving gear (15) that meshes with the rotating gear column (13). The bottom of the rotating rod (8) is rotatably connected to an openable cover plate assembly (16).

2. A mixer for producing UHPC premix according to claim 1, characterized in that: The cover plate assembly (16) comprises an internally hollow fixed ring (161), the side wall of the fixed ring (161) is symmetrically provided with two internally hollow sliders (162), the inner cavity side wall of the discharge pipe (2) is provided with a slide groove (201) that cooperates with the sliders (162), the inner wall of the fixed ring (161) is rotatably connected with a cover plate (163), and the two ends of the rotating shaft of the cover plate (163) are inserted into the inner cavities of the two sliders (162) and fixedly connected with a rotating gear (164), The bottom of the slider (162) is slidably connected to an extrusion rod (165), and one end of the extrusion rod (165) is inserted into the inner cavity of the slider (162) and is provided with a rack meshing with the rotating gear (164). When the slider (162) slides to the bottom of the slide groove (201), it pushes the rack to slide and drives the rotating gear (164) to rotate. Two obliquely arranged installation rods (166) are fixedly connected to the top of the fixed ring (161), and the installation rods (166) are rotatably connected to the rotating rod (8).

3. A mixer for producing UHPC premix according to claim 2, characterized in that: A spring (167) connected to the rack is provided at the top of the inner cavity of the slider (162).

4. A mixer for producing UHPC premix according to claim 1, characterized in that: The feeding cylinder (3) comprises a first cylinder (31), a second cylinder (32) and a third cylinder (33) which are connected to rotate relative to each other in sequence, and the third cylinder (33) is fixedly connected to the bottom of the inner cavity of the mixing cylinder (1) via a support rod, the first discharge port (4) is opened on the outer wall of the second cylinder (32), the second discharge port (5) is opened on the outer wall of the first cylinder (31), a driven gear (34) is fixedly connected to the outer wall of the second cylinder (32), the driving motor (14) is a double-headed motor, and one output end of the driving motor (14) is connected to A first driving gear (15); the other output end of the driving motor (14) passes through the top of the mixing barrel (1) and is provided with a second driving gear (17) meshingly connected to the driven gear (34); the blocking barrel (10) comprises a rotatably connected lower connecting portion (101) and an upper connecting portion (102); the third discharge port (11) is provided on a side wall of the lower connecting portion (101); the fourth discharge port (12) is provided on a side wall of the upper connecting portion (102); and the lower connecting portion (101) is slidably connected to the inner wall of the second barrel (32).

5. A mixer for producing UHPC premix according to claim 4, characterized in that: The inner wall of the second cylinder (32) is provided with limit strips (35) at equal angles, and the outer wall of the lower connecting portion (101) is provided with limit grooves (1011) that cooperate with the limit strips (35).

6. A mixer for producing UHPC premix according to claim 4, characterized in that: The outer wall of the second cylinder (32) is provided with a conical material guide plate (36), and the conical material guide plate (36) is located below the first material outlet (4).

7. A mixer for producing UHPC premix according to claim 4, characterized in that: A slide bar (103) having a T-shaped cross section is provided at the top of the lower connecting portion (101), and an annular groove (104) adapted to the slide bar (103) is provided at the bottom of the upper connecting portion (102).

8. A mixer for producing UHPC premix according to claim 4, characterized in that: An inner gear ring (18) is rotatably connected to the top of the inner cavity of the mixing cylinder (1) and meshes with the second driving gear (17). A plurality of fixing rods (19) are fixedly connected at equal angles to the bottom of the inner gear ring (18). A stirring rod (20) is mounted on one side of the fixing rod (19).

9. A mixer for producing UHPC premix according to claim 8, characterized in that: The stirring rod (20) and the fixed rod (19) are hingedly connected to each other, the outer wall of the third cylinder (33) is threadedly connected to a reciprocating threaded sleeve (21), the stirring rod (20) and the reciprocating threaded sleeve (21) are hingedly connected to each other, and the stirring rod (20) is composed of four connecting rods hingedly connected in sequence, and the free ends of the first and last connecting rods are hingedly connected to the fixed rod (19) and the reciprocating threaded sleeve (21), respectively.

10. A method for mixing a UHPC premix, characterized in that: The mixing is carried out using the mixer described in any one of claims 1 to 9.

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