A self-falling stirring UHPC mixing production process and complete equipment

Abstract

The present invention provides a self-falling stirring UHPC stirring production equipment, including: a feeding system, a lifting mechanism powder feeding system, a water and additive adding system, a steel fiber feeding system and a self-falling stirring stirring system; wherein the feeding system includes at least one set of aggregate lifting system, a metering bucket, and a mixed material horizontal conveying device; the lifting mechanism powder feeding system includes a first feeding pipe, a first powder bin group, a weighing bucket, a second feeding pipe and a second powder bin group, and the water and additive adding system includes an admixture storage tank, a water supply device and an admixture mixing and dissolving device; the steel fiber feeding system includes a first steel fiber metering lifting device, a first steel fiber sieve distributor, a second steel fiber metering lifting device and a second steel fiber sieve distributor; the stirring system includes at least one self-falling stirring mixer. All performance parameters have been significantly improved, indicating that the optimization of production process and equipment structure has a significant effect on improving product quality.

Description

Technical Field

[0001] The invention relates to a self-falling stirring UHPC mixing production process and a complete set of equipment, and in particular to a process method and a complete set of equipment for UHPC (ultra-high performance concrete) batching, conveying and mixing production. Background Art

[0002] UHPC is the abbreviation of Ultra-High Performance Concrete. Internationally, it refers to a general term for cement-based composite materials with a compressive strength of more than 150MPa, ultra-high toughness and ultra-long durability. It is mainly composed of quartz sand, silica fume, cement, water reducer, steel fiber and other materials. It is constructed according to the principle of maximum density and has an ultra-low water-cement ratio and porosity, thereby minimizing the defects (pores and microcracks) inside the material.

[0003] UHPC materials do not contain coarse aggregates, and the particle size is generally less than 1mm. Due to its high density, it has ultra-high strength and excellent durability, and its service life can reach more than 200 years. In addition, the fine steel fibers dispersed in UHPC can greatly slow down the expansion of micro-cracks inside the material, so that the material exhibits ultra-high toughness and ductility. It is the most advanced cement-based civil engineering material in the world today. Due to its excellent mechanical and durability properties, in the context of bridge engineering requirements for light weight, high strength, rapid erection, and durability, UHPC will have broad application prospects in the field of bridges, tunnels, and national defense engineering.

[0004] However, since UHPC has a higher cement content and a lower water content than ordinary cement concrete, it has high hydration heat and large shrinkage during the preparation and pouring process, which easily forms cracks in the structure, limiting its application in large-scale concrete projects.

[0005] Through experimental research, it was found that the UHPC mixture undergoes hydration reaction from the moment it enters the mold, and the temperature gradually rises slowly. The hydration heat release increases rapidly about 10 hours after entering the mold, until the hydration heat release rate gradually slows down about 20 hours, and the hydration heat release is mainly concentrated in 10-20 hours. The use of crushed ice can significantly reduce the temperature of the UHPC mixture entering the mold, thereby reducing the temperature peak at the center point, but it takes time for the crushed ice to melt, which prolongs the mixing time of the UHPC material preparation, reduces production efficiency, and increases the consumption of stirring power. At the same time, when the thickness of UHPC exceeds 20mm, the temperature difference between the center and the outer edge of the section reaches 7.3℃, and the maximum tensile stress value caused by the temperature difference is 4.63MPa, which is very likely to cause cracks in the internal structure due to stress imbalance. Therefore, the temperature stress generated by the hydration heat in the UHPC production process cannot be ignored.

[0006] By adopting the production process and equipment of the present invention, various performance parameters of UHPC concrete structures are significantly improved, indicating that the optimization of production process and equipment structure has a significant effect on improving product quality. Summary of the invention

[0007] The purpose of the present invention is to provide a self-falling stirring UHPC mixing production process and a complete set of equipment, which can effectively solve the problems of the current UHPC mixing process being non-standard, large power required for equipment driving, low production efficiency, and casting cracks caused by heat generation during the mixing process of the mixture.

[0008] In order to solve the above problems, the present invention provides a self-falling stirring UHPC stirring production complete set of equipment, including: a feeding system, a lifting mechanism powder feeding system, a water and additive adding system, a steel fiber feeding system and a self-falling stirring stirring system; wherein the feeding system includes at least one set of aggregate lifting system, a metering bucket, and a mixed material horizontal conveying device; the lifting mechanism powder feeding system includes a first feeding pipe, a first powder silo group, a weighing bucket, a second feeding pipe and a second powder silo group, and the water and additive adding system includes an additive storage tank, a water supply device and an additive mixing and dissolving device; the steel fiber feeding system includes a first steel fiber metering and lifting device, a first steel fiber sieve distributor, a second steel fiber metering and lifting device and a second steel fiber sieve distributor; the stirring system includes at least one self-falling stirring mixer.

[0009] Furthermore, the aggregate lifting system in the above-mentioned self-falling mixing UHPC mixing production complete set of equipment includes an aggregate lifting bucket, an aggregate vertical lifting device, an aggregate horizontal moving device and four aggregate silos, which are the first aggregate silo, the second aggregate silo, the third aggregate silo and the fourth aggregate silo in order of the size of the stored aggregates from small to large.

[0010] Furthermore, the water and additive system in the self-falling stirring UHPC stirring production complete set of equipment also includes an air pump, which is used to inject gas into the water.

[0011] Furthermore, the gas injected by the air pump in the above-mentioned self-falling stirring UHPC stirring production complete set of equipment is carbon dioxide or nitrogen.

[0012] Furthermore, the first steel fiber metering and lifting device in the above-mentioned self-falling stirring UHPC stirring production complete set of equipment includes a first steel fiber metering device, a first steel fiber vertical lifting device, and a first steel fiber horizontal conveying device; the second steel fiber metering and lifting device includes a second steel fiber metering device, a second steel fiber vertical lifting device, and a second steel fiber horizontal conveying device.

[0013] Furthermore, the self-falling stirring mixer in the above-mentioned self-falling stirring UHPC stirring production complete set of equipment includes a stirring barrel shell, wherein the stirring barrel shell includes a stirring barrel outer cover and a stirring barrel inner cover, and there is a accommodating space between the stirring barrel outer cover and the stirring barrel inner cover for storing cooling circulating water; reinforcing ribs are also provided on the stirring barrel outer cover and the stirring barrel inner cover; the stirring barrel outer cover is provided with a cooling circulating water inlet and a cooling circulating water outlet, and the cooling circulating water flows in from the cooling circulating water inlet and flows out from the cooling circulating water outlet after cooling; a finished product discharge port is also provided at the bottom of the self-falling stirring mixer, and a discharge hopper can also be provided at the bottom of the finished product discharge port; it also includes a motor, a gear shifter, a belt transmission device, and a transmission, wherein the gear shifter has a high speed gear and a low speed gear, and a stirring main shaft is also provided in the stirring barrel shell, and the power of the motor is transmitted to the stirring main shaft through the gear shifter, the belt transmission device, and the transmission in turn, thereby driving the spiral stirring blades mounted on the stirring main shaft to rotate.

[0014] On the other hand, a self-falling stirring UHPC mixing production process is also provided, including: a quartz sand feeding step, a powder feeding step, a water and admixture feeding step, a steel fiber feeding step and a mixing step; wherein the quartz sand feeding step is to weigh the quartz sand aggregate according to the proportion and then transfer it to the self-falling stirring mixing system; the powder feeding step is to weigh the cement and silicon powder required for the mixing process according to the proportion and then transfer it to the self-falling stirring mixing system; the water and admixture feeding step is to first inject gas into the water required for the mixing process through an air pump and dissolve it, and then add the water required for the mixing process The steel fiber feeding step is to weigh the steel fiber required for the mixing process according to the ratio and then transfer it to the self-falling stirring system; the stirring step is to first start the cooling circulating water circulation step, so that ice water close to 0°C enters the cavity in the mixing barrel shell from the cooling circulating water inlet through the conveying pipeline, and after exchanging heat with the mixer through the inner cover of the mixing barrel, it flows out from the cooling circulating water outlet and refluxes through the pipeline, and then the motor is started for stirring. The mixing barrel shell can be kept in a low temperature state during the stirring process.

[0015] By adopting the production process and equipment of the present invention, various performance parameters of UHPC concrete structures are significantly improved, indicating that the optimization of production process and equipment structure has a significant effect on improving product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a schematic diagram of an implementation process.

[0017] Figure 2 This is the front view of the overall structure of the complete set of equipment of the present invention.

[0018] Figure 3 It is a top view of the overall structure of the complete set of equipment of the present invention.

[0019] Figure 4 It is a side view of the main building of the complete set of equipment mixing station of the present invention.

[0020] Figure 5 It is a schematic diagram of the front and side profile structure of the self-falling stirring UHPC mixer of the present invention.

[0021] Figure 6 It is a schematic diagram of the cross-sectional structure of the barrel of the self-falling stirring UHPC mixer of the present invention.

[0022] Figure 7 It is a schematic diagram of the transmission mechanism structure of the self-falling stirring UHPC mixer of the present invention.

[0023] Reference numerals:

[0024] 1: Feeding system

[0025] 11: Aggregate lifting system

[0026] 1101: Aggregate lifting bucket

[0027] 1102: Aggregate vertical lifting device

[0028] 1103: Aggregate horizontal moving device

[0029] 1104: Aggregate silo

[0030] 12: Weighing bucket

[0031] 13: Mixture horizontal conveying device

[0032] 2: Lifting mechanism powder feeding system

[0033] 21: First feed pipe

[0034] 22: The first powder silo group

[0035] 2201: First powder silo

[0036] 23: First weighing bucket

[0037] 24: Second feed pipe

[0038] 25: Second powder silo group

[0039] 2501: Second powder silo

[0040] 26: Second weighing bucket

[0041] 3: Water and additive adding system

[0042] 31: Additive storage tank

[0043] 32: Water supply device

[0044] 33: Additive mixing and dissolving device

[0045] 4: Steel fiber feeding system

[0046] 41: The first steel fiber metering and lifting device

[0047] 4101: The first steel fiber metering device

[0048] 4102: The first steel fiber vertical lifting device

[0049] 4103: The first steel fiber horizontal conveyor

[0050] 42: The first steel fiber screen distributor

[0051] 43: The second steel fiber metering and lifting device

[0052] 4301: Second steel fiber metering device

[0053] 4301: Second steel fiber vertical lifting device

[0054] 4303: Second steel fiber horizontal conveying device

[0055] 44: Second steel fiber screen distributor

[0056] 5: Single horizontal shaft mixing system:

[0057] 51: The first self-falling mixer

[0058] 511: Mixing drum shell

[0059] 511A: Mixing drum cover

[0060] 511B: Mixing drum inner cover

[0061] 511C: Reinforcement ribs

[0062] 512: Cooling circulating water inlet

[0063] 513: Cooling circulating water outlet

[0064] 514: Electric actuator

[0065] 515: Low speed stirring controller

[0066] 516: High and low speed control fork

[0067] 517: High speed stirring controller

[0068] 518: Motor

[0069] 519: Motor output shaft

[0070] 520: slide key

[0071] 521: Sliding gear

[0072] 522: High speed output gear

[0073] 523: Low speed output gear

[0074] 524: Dual gear

[0075] 525: Transmission key

[0076] 526: High and low speed control output shaft

[0077] 527: Pulley drive

[0078] 528: Transmission

[0079] 529: Transmission output gear

[0080] 530: Mixing input gear

[0081] 531: Spiral stirring blade

[0082] 532: Discharge hopper

[0083] 533: Feed hopper

[0084] 52: Second self-falling mixer DETAILED DESCRIPTION

[0085] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0086] In the description of the present invention, it should be noted that the terms “first”, “second” and “third” are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0087] Referring to the figure, the self-falling stirring UHPC mixing production equipment shown in this embodiment is shown below, including: a feeding system 1, a powder 2, a water and additive adding system 3, a steel fiber feeding system 4 and a self-falling stirring system 5.

[0088] The feeding system 1 is introduced below. The feeding system 1 includes 2 sets of aggregate lifting systems 11, a metering bucket 12, and a mixed material horizontal conveying device 13. The aggregate lifting system 11 includes an aggregate lifting bucket 1101, an aggregate vertical lifting device 1102, an aggregate horizontal moving device 1103, and 4 aggregate bins 1104. According to the size of the stored aggregates, they are the first aggregate bin, the second aggregate bin, the third aggregate bin, and the fourth aggregate bin. When the aggregate bin 1104 needs to be loaded, the aggregate first enters the aggregate vertical lifting device 1102 through the aggregate lifting bucket 1101 and is lifted to the top, and then is transported to the aggregate bin 1104 through the aggregate horizontal moving device 1103.

[0089] Next, the powder feeding system 2 is introduced. The powder feeding system 2 includes a first feeding pipe 21, a first powder bin group 22, a weighing bucket 23, a second feeding pipe 24 and a second powder bin group 25. Since the powder materials needed in the mixing process are cement and silica fume, there are two powder bin groups in total, wherein the first powder bin group 22 includes a first powder bin 2201, and the second powder bin group 25 includes a second powder bin 2501. When powder needs to be filled, the powder is blown into the first powder bin 2201 and the second powder bin 2501 respectively through the first feeding pipe 21 and the second feeding pipe 24 under the action of high-pressure gas. During production, the cement in the first powder bin group 2201 is transported to the first weighing bucket 23 through the screw conveyor 2502 for cumulative weighing and metering, and the silica fume in the second powder bin group 2501 is transported to the second weighing bucket 26 through the screw conveyor 2502 for cumulative weighing and metering.

[0090] Next, the water and additive adding system 3 is introduced. The water and additive system 3 includes an additive storage tank 31, a water supply device 32 and an additive mixing and dissolving device 33. After the additive and water are measured, they enter the additive mixing solvent device 33 to be fully mixed and dissolved.

[0091] Since the UHPC material is very viscous after mixing, the resistance during the mixing process is particularly large, and it will also encounter great resistance during the pumping process. Special concrete pumping equipment is required for pumping, and the pumping adaptability is poor. Therefore, the water and additive adding system 3 can also include an air pump (not shown in the figure), through which gas (such as carbon dioxide, nitrogen and other gases) is injected into the water and dissolved, so that the water with dissolved gas participates in the mixing process, and the added gas is released from the water. At the same time, it also absorbs heat, thereby reducing the temperature of the mixing process, and forming a large number of tiny bubbles inside the UHPC material, which effectively reduces the viscosity, reduces the mixing resistance, and can also effectively reduce the resistance of the pumping process.

[0092] Next, the steel fiber feeding system 4 is introduced. The steel fiber feeding system 4 includes a first steel fiber metering and lifting device 41, a first steel fiber sieve distribution feeder 42, a second steel fiber metering and lifting device 43 and a second steel fiber sieve distribution feeder 44, wherein the first steel fiber metering and lifting device 41 includes a first steel fiber metering device 4101, a first steel fiber vertical lifting device 4102, and a first steel fiber horizontal conveying device 4103. After unpacking, the steel fibers are first sent to the first steel fiber metering and lifting device 41, then weighed and measured by the first steel fiber metering device 4101, and then lifted to the top of the complete set of equipment by the first steel fiber vertical lifting device 4102, and then lifted to the top of the complete set of equipment by the first steel fiber vertical lifting device 4102, and then lifted to the top of the complete set of equipment by the first steel fiber metering device 4101. The steel fiber horizontal conveying device 4103 conveys the steel fiber to the first steel fiber screen distributor 42 to enter the screening process; similarly, the second steel fiber metering and lifting device 43 includes a second steel fiber metering device 4301, a second steel fiber vertical lifting device 4302, and a second steel fiber horizontal conveying device 4303. After the steel fiber is unpacked, it is first sent to the second steel fiber metering and lifting device 43, then weighed and measured by the second steel fiber metering device 4301, and then lifted to the top of the complete set of equipment by the second steel fiber vertical lifting device 4302, and then conveyed to the second steel fiber screen distributor 44 by the second steel fiber horizontal conveying device 4303 to enter the screening process.

[0093] Next, the self-falling mixing system 5 is introduced. The mixing system 5 includes a first self-falling mixer 51 and a second self-falling mixer 52. The two mixers cooperate in production. When one of the mixers is producing, the other mixer can mix ingredients. The first self-falling mixer 51 is taken as an example for introduction. The first self-falling mixer 51 includes a mixing barrel shell 511, wherein the mixing barrel shell 511 includes a mixing barrel outer cover 511A and a mixing barrel inner cover 511B. There is a accommodating space between the mixing barrel outer cover 511A and the mixing barrel inner cover 511B for storing cooling circulating water. At the same time, in order to enhance the strength, a space is provided between the mixing barrel outer cover 511A and the mixing barrel inner cover 511B. The inner cover 511B is also provided with reinforcing ribs 511C, and the outer cover 511A of the mixing barrel is provided with a cooling circulating water inlet 512 and a cooling circulating water outlet 513. The cooling circulating water flows in from the cooling circulating water inlet 512, and flows out from the cooling circulating water outlet 513 after cooling. The outer circle of the mixing drum shell 511 is welded with a mixing input gear 530, and the mixing input gear 530 is connected to the transmission output gear 529 installed on the output shaft of the transmission 528. Two pairs of spiral mixing blades 531 are welded in the inner cover 511B of the mixing drum, and each pair of spiral mixing blades 531 is composed of two mixing blades with different structural dimensions and installation dimensions. One end of the mixing drum shell 511 is closed, and the other end is open. The lower end of the opening is provided with a discharge hopper 532, and the upper end is provided with a feed hopper 533.

[0094] A plurality of ventilation pipes can be evenly arranged at the bottom of the mixing barrel shell 511, and a plurality of ventilation holes can be evenly arranged on the ventilation pipes. The ventilation pipes can inject gas into the mixing barrel shell 511 through an air pump, so that the gas can be injected into the mixing process during the mixing process, so that the viscosity of the concrete can be effectively reduced, thereby better reducing the temperature during the mixing process. Preferably, in order to better reduce the problem, the injected gas can be low-temperature gas (temperature below 10 degrees Celsius).

[0095] The power of the motor 518 is transmitted to the stirring main shaft 531 through the gear shifter and the gearbox 528 in turn, thereby driving the stirring blade 533 to rotate. The gear shifter has two gears, a high gear and a low gear, and the high gear and the low gear can be selected according to actual use. The specific driving structure is as follows: the motor has a motor output shaft 519, and the gear shifter includes a high-speed output gear 522, a sliding gear 521 and a low-speed output gear 523 which are sequentially sleeved on the motor output shaft 519, and the sliding gear 521 is radially fixed on the motor output shaft 519 by a sliding key 520, and the high-speed output gear 522 and the low-speed output gear 523 are both meshed with a double gear 524 sleeved on the high-speed and low-speed control output shaft 526, and the double gear 524 is radially fixed by a transmission key 525. In order to switch between the high-speed and low-speed states, a high-speed and low-speed control fork 516 is also provided. The high-speed and low-speed control fork 516 switches between the high-speed and low-speed states under the action of the electric push rod 514. Correspondingly, at the high-speed and low-speed control fork 516, A low-speed stirring controller 515 and a high-speed stirring controller 517 are provided at the two extreme positions. The electric push rod 514 drives the high-speed and low-speed control forks 516 along the motor output shaft 519, and drives the sliding gear 521 to slide along the motor output shaft 519 at the same time. When the high-speed and low-speed control forks 516 touch the low-speed stirring controller 515 or the high-speed stirring controller 517, the action stops. When the low-speed stirring controller 515 is touched, the outer teeth of the sliding gear 521 are completely inserted into the inner teeth of the low-speed output gear 523. Correspondingly, when the high-speed stirring controller 517 is touched, the outer teeth of the sliding gear 521 are completely inserted into the inner teeth of the high-speed output gear 522, so that the motor 518 can obtain two different speeds of high speed and low speed. Then the gear shifter transmits the power to the transmission 528 through the belt transmission device 527. After the transmission 528 has completed the deceleration, the power is transmitted to the mixing barrel housing 511. The power can also be transmitted to the mixing barrel housing 511 and the spiral stirring blade 531 installed thereon after another deceleration through the transmission output gear 529 and the stirring input gear 530. The structure of the second self-falling stirring mixer 52 is the same as that of the first self-falling stirring mixer 51, and will not be repeated here.

[0096] The mixing production process based on the above-mentioned complete set of equipment is shown below, which specifically includes a quartz sand feeding step, a powder feeding step, a water and admixture feeding step, a steel fiber feeding step and a mixing step, wherein the quartz sand feeding step is to weigh the quartz sand aggregate according to the ratio and then transfer it to the self-falling mixing system 5; the powder feeding step is to weigh the cement and silicon powder required for the mixing process according to the ratio and then transfer it to the self-falling mixing system 5; the water and admixture feeding step is to weigh the water and admixture required for the mixing process according to the ratio and then transfer it to the self-falling mixing system The steel fiber feeding step is to weigh the steel fibers required for the mixing process according to the proportion and then transfer them to the self-falling mixing system 5; the mixing step is to start the cooling circulating water circulation step first, so that ice water close to 0°C enters the cavity in the mixing barrel shell 511 from the cooling circulating water inlet 512 through the conveying pipeline, and after exchanging heat with the mixer through the mixing barrel inner cover 511B, it flows out from the cooling circulating water outlet 513 and flows back through the pipeline, and then the motor is started for mixing. The mixing barrel shell can be kept in a low temperature state during the mixing process. And the electric push rod 514 drives the high and low speed control fork 516 through the automatic control program to switch the low speed state and the high speed state. Since the self-falling mixing system 5 includes two sets of mixers, namely the first self-falling mixer 51 and the second self-falling mixer 52, when one set of mixers is mixing, the other set of mixers can prepare materials, so it can work continuously.

[0097] Taking the commonly used 1 cubic meter self-falling stirring UHPC mixer as an example, its motor power is 37Kw. After changing to the high-low speed drive conversion mode, its motor power is 30Kw, and the energy-saving effect is obvious.

[0098] In order to verify the superiority and effectiveness of this UHPC mixing production process, Table 1 shows the proportion of a single UHPC grade, Table 2 shows the change of temperature over time of UHPC mixture produced by traditional process and this process, and Table 3 shows the comparison of performance test results of UHPC mixture produced by traditional process and this process.

[0099] Table 1 shows the mix ratio of a single UHPC grade (unit: kg / m 3 )

[0100] Materials used UHPC dry powder water Steel Fiber proportion 2238 156 175

[0101] Table 2 Changes of UHPC mixture temperature over time in conventional and this process Ambient temperature 28°C

[0102]

[0103] Table 3 is a comparison of the performance test results of UHPC mixtures in the traditional process and this process

[0104]

[0105] It is obvious from the results in Table 2 that, by using the production process and equipment of the present invention, the temperature of the UHPC mixture is kept at a low temperature after 100 minutes, which is beneficial to offset the high temperature of the concrete structure caused by the concentrated release of hydration heat 10-20 hours after the UHPC mixture is poured into the mold, prevent the generation of casting cracks, and improve the quality of the structure.

[0106] It is obvious from the results in Table 3 that by adopting the production process and equipment of the present invention, various performance parameters of UHPC concrete structures are significantly improved, indicating that the optimization of production process and equipment structure has a significant effect on improving product quality.

[0107] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

Claims

1. A self-falling stirring UHPC stirring production equipment, characterized in that: include: A feeding system (1), a lifting mechanism powder feeding system (2), a water and additive adding system (3), a steel fiber feeding system (4) and a self-falling stirring stirring system (5); The feeding system (1) comprises at least one set of aggregate lifting system (11), a weighing bucket (12), and a mixed material horizontal conveying device (13); The lifting mechanism powder material feeding system (2) comprises a first material delivery pipe (21), a first powder material bin group (22), a weighing bucket (23), a second material delivery pipe (24) and a second powder material bin group (25). The water and additive adding system (3) comprises an additive storage tank (31), a water supply device (32), an additive mixing and dissolving device (33) and an air pump; The steel fiber feeding system (4) comprises a first steel fiber metering and lifting device (41), a first steel fiber screen distributor (42), a second steel fiber metering and lifting device (43) and a second steel fiber screen distributor (44); The stirring system (5) comprises at least one self-falling stirring mixer; The self-falling stirring mixer comprises a stirring barrel housing (511); A plurality of ventilation pipes are evenly arranged at the bottom of the mixing barrel shell (511), and a plurality of ventilation holes are evenly arranged on the ventilation pipes. The ventilation holes are used to inject gas into the mixing barrel shell (511) through the air pump; The gas is a low-temperature gas with a temperature lower than 10 degrees Celsius.

2. The self-falling stirring UHPC stirring production equipment according to claim 1 is characterized in that: The aggregate lifting system (11) comprises an aggregate lifting bucket (1101), an aggregate vertical lifting device (1102), an aggregate horizontal moving device (1103) and four aggregate bins (1104), which are respectively a first aggregate bin, a second aggregate bin, a third aggregate bin and a fourth aggregate bin in order of the size of the stored aggregates from small to large.

3. The self-falling stirring UHPC stirring production equipment according to claim 1 is characterized in that: The air pump is used to inject gas into water.

4. The self-falling stirring UHPC stirring production equipment according to claim 3 is characterized in that: The gas injected by the air pump is carbon dioxide or nitrogen.

5. The self-falling stirring UHPC stirring production equipment according to claim 4 is characterized in that: The first steel fiber metering and lifting device (41) comprises a first steel fiber metering device (4101), a first steel fiber vertical lifting device (4102), and a first steel fiber horizontal conveying device (4103); The second steel fiber metering and lifting device (43) comprises a second steel fiber metering device (4301), a second steel fiber vertical lifting device (4302), and a second steel fiber horizontal conveying device (4303).

6. The self-falling stirring UHPC stirring production equipment according to claim 5 is characterized in that: The mixing barrel shell (511) comprises a mixing barrel outer cover (511A) and a mixing barrel inner cover (511B), and a storage space is provided between the mixing barrel outer cover (511A) and the mixing barrel inner cover (511B) for storing cooling circulating water; The outer cover (511A) and the inner cover (511B) of the mixing barrel are also provided with reinforcing ribs (511C); The outer cover (511A) of the mixing barrel is provided with a cooling circulating water inlet (512) and a cooling circulating water outlet (513), and the cooling circulating water flows in from the cooling circulating water inlet (512) and flows out from the cooling circulating water outlet (513) after being cooled; The bottom of the self-falling stirring mixer is also provided with a finished product discharge port (534), and a discharge hopper (532) can also be provided at the bottom of the finished product discharge port (534); The mixing drum shell (511) further comprises a motor (518), a gear shifter, a belt transmission device (527), and a transmission (528), wherein the gear shifter has a high speed gear and a low speed gear, and a mixing main shaft (531) is also provided in the mixing drum shell (511), and the power of the motor (518) is sequentially transmitted to the mixing main shaft (531) through the gear shifter, the belt transmission device (527), and the transmission (528), thereby driving the spiral mixing blade (531) mounted on the mixing main shaft (531) to rotate.

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