CN213829703U - Vacuum mixer for ultra-high performance concrete - Google Patents

Abstract

The utility model relates to a concrete mixer technical field. A vacuum mixer for ultra-high performance concrete comprises a mixing cylinder, a mixing component, a vacuumizing component and a feeding component, wherein a cover body is arranged at the top of the mixing cylinder; the stirring assembly is arranged in the stirring cylinder body and used for stirring and mixing the mixture, and a sealing unit is arranged between the stirring assembly and the stirring cylinder body; the vacuumizing assembly is connected with the stirring cylinder and is used for vacuumizing the stirring cylinder; the feeding assembly is connected with the stirring cylinder body through a material conveying pipeline, and a sealing valve is arranged on the material conveying pipeline. This application structural design is reasonable, can ensure the vacuum in the churn invariable, improves the mixture quality after the stirring, optimizes the structure of product, improves life and the convenience of use.

Description

Vacuum mixer for ultra-high performance concrete

Technical Field

The utility model relates to a concrete mixer technical field especially relates to a vacuum mixer for ultra high performance concrete.

Background

Ultra-High Performance Concrete (UHPC) is a new development in modern Concrete technology, promoted by good particle packing, appropriate mixing procedures, scientific curing regimes, and appropriate amounts of cementitious and admixtures. UHPC is receiving increasing attention for its excellent properties and its range of applications is also increasing. The UHPC is used as the outer-layer protective panel of the building, so that impact damage caused by external force of airplanes and the like to important facilities such as a nuclear power station, a high-rise building, a power plant and the like can be reduced, and an ideal aesthetic effect can be obtained; the high flow state self-compaction performance makes the template more suitable for a complex template and a structure with high reinforcement rate; excellent durability is also an ideal choice for serving buildings in severe environments. However, UHPC eliminates coarse aggregate for improving homogeneity, high-activity micropowder such as silica fume and the like is required to be added for obtaining a compact microstructure, a lower water-to-gel ratio is required to be adopted for improving strength, more additives are required to be added for meeting the working requirement, so that the use amounts of a cementing material and the additives are far higher than those of the traditional concrete, the mixture is more viscous, and air introduced in the stirring process is more difficult to eliminate. Generally, the introduced air has an important influence on the workability of fresh concrete and the quality of hardened concrete, the accumulation of air bubbles below the fibers or reinforcing steel reduces the bonding strength between the fibers and reinforcing steel and the surrounding cement matrix, and the higher air content is also the main reason why the compressive strength of UHPC prepared by the conventional method hardly exceeds 200 MPa. Researches show that the measure of reducing the atmospheric pressure in the mixture can effectively eliminate the content of bubbles and reduce the pore size of the bubbles in the stirring process, thereby improving the performance of the hardened concrete. For this reason, researchers developed vacuum mixers that can reduce the content of air bubbles in concrete mixtures, for example, chinese patent (CN 201620604914.3) discloses a concrete vacuum mixer, which makes a breakthrough contribution to improving the compactness, strength and durability of concrete. However, the application is only directed at the forced concrete vacuum mixer, and the structure of the forced concrete vacuum mixer is characterized in that the motor is arranged outside the mixing drum, the rotating shaft connected with the motor penetrates through the mixing drum, and the air tightness and the vacuum degree of the mixing drum are difficult to ensure at the joint of the rotating shaft and the mixing drum. At the same time, the addition and mixing procedures of this application also affect the concrete properties and are less suitable for mixing UHPC mixtures. In order to solve the problems of the application, another chinese patent (CN 201721108634.4) attempts to solve the problem, and the application proposes a conical reverse discharging concrete vacuum mixer, which is characterized in that a motor drives a mixing drum to rotate during the mixing process, but because of the rotation of the mixing drum, vacuum pumping needs to be completed before mixing, but the loss of vacuum degree in the mixing drum can be caused during the water adding and mixing processes, because continuous vacuum pumping cannot be performed, the effect of eliminating bubbles in the mixture is limited, especially the puncture effect of forced blades on bubbles is lacked, and the relatively low rotating speed of the mixing drum determines that the mixer is not suitable for mixing UHPC mixture with larger viscosity, especially fibers. Accordingly, there is a need for a new vacuum mixer that is structurally sound, environmentally friendly, efficient and more suitable for Ultra High Performance Concrete (UHPC) mix preparation.

Disclosure of Invention

The utility model aims at the problem that above-mentioned exists with not enough, provide a vacuum mixer for ultra high performance concrete, its structural design is reasonable, can ensure the vacuum constancy in the churn, improves the mixture quality after the stirring, optimizes the structure of product, improves life and the convenience of use.

In order to realize the purpose, the adopted technical scheme is as follows:

a vacuum mixer for ultra-high performance concrete, comprising:

the stirring cylinder is provided with a cover body at the top;

the stirring assembly is arranged in the stirring cylinder body and used for stirring and mixing a mixture, and a sealing unit is arranged between the stirring assembly and the stirring cylinder body;

the vacuumizing assembly is connected with the stirring cylinder and is used for vacuumizing the stirring cylinder; and

and the feeding assembly is connected with the stirring cylinder body through a material conveying pipeline, and a sealing valve is arranged on the material conveying pipeline.

According to the utility model discloses vacuum mixer for ultra-high performance concrete, preferably, the stirring subassembly includes:

the stirring shaft is arranged on the cover body through a bearing;

the stirring motor is arranged on the cover body and is in transmission connection with the stirring shaft; and

and the stirring paddle is arranged on the stirring shaft.

According to the vacuum mixer for ultra-high performance concrete of the present invention, preferably, the mixing paddle comprises a helical blade, the helical blade is disposed on the mixing shaft, and a plurality of sets of support rods are further disposed between the helical blade and the mixing shaft;

the sealing unit is a sealing box arranged on the cover body outside the stirring motor, or/and the sealing unit is an airtight bearing arranged between the stirring shaft and the cover body.

According to the utility model discloses vacuum mixer for ultra-high performance concrete, preferably, the evacuation subassembly includes:

the vacuumizing pipe is fixedly arranged on the stirring cylinder body and is provided with a vacuum valve; and

and the vacuum pump is arranged at the outer end part of the vacuumizing pipe.

According to the utility model discloses vacuum mixer for ultra high performance concrete, preferably, connect with the dust absorption unit through the switching-over valve on the evacuation pipe, be provided with the air current control valve on the lateral line between evacuation pipe and the dust absorption unit; the vacuum pumping pipe is also connected with a vacuum degree instrument and a vacuum valve through branch pipelines, and an exhaust silencing valve is arranged at the air outlet end of the vacuum pump.

According to the utility model discloses vacuum mixer for ultra-high performance concrete, preferably, the feeding subassembly includes solid material supply unit and liquid material supply unit, solid material supply unit includes solid material conveying pipeline, set up solid material seal valve on solid material conveying pipeline, and with solid material feeding equipment that solid material conveying pipeline is connected;

the liquid material supply unit comprises a liquid material conveying pipeline, a liquid material sealing valve arranged on the liquid material conveying pipeline, and liquid material supply equipment connected with the liquid material conveying pipeline.

According to the utility model discloses vacuum mixer for ultra high performance concrete, preferably, the solid material supply equipment includes feed bin, conveyer, metering equipment, solid material storage tank and solid material control valve, a plurality of feed bins through corresponding conveyer and metering equipment with solid material storage tank intercommunication; the inner end part of the liquid material conveying pipeline is provided with a liquid material nozzle, the liquid material feeding device comprises a stock tank, a flow pump and a liquid material storage tank, and the stock tanks are communicated with the liquid material storage tank through the corresponding flow pumps.

According to the utility model discloses vacuum mixer for ultra high performance concrete, preferably, the stirring barrel bottom is provided with discharge gate and ejection of compact subassembly, ejection of compact subassembly includes:

the discharge door is hinged with the stirring barrel;

the limiting table is arranged at the bottom of the stirring barrel and corresponds to the movable end of the discharge door;

the anti-falling lock pin is arranged on the limiting table in a sliding mode, a first compression spring is arranged between the anti-falling lock pin and the limiting table, the first compression spring drives the anti-falling lock pin to keep an extending state, and the anti-falling lock pin is limited and supported on the lower portion of the discharging door in a closed state of the discharging door; and

the ejection unit is arranged at the hinged end part of the discharge door and is a torsion spring or a second compression spring;

the discharge gate is the toper, discharge gate upper portion is provided with sealed frustum, be provided with annular seal groove on the sealed frustum be provided with sealing filler or sealing washer in the annular seal groove.

According to the utility model discloses vacuum mixer for ultra high performance concrete, preferably, the lid with stirring barrel structure as an organic whole, stirring barrel or be provided with the base on the lid.

According to the utility model discloses vacuum mixer for ultra-high performance concrete, preferably, the lid with the stirring barrel is the components of a whole that can function independently structure, the lid bottom is provided with the hoop, the hoop bottom is provided with the assembly heavy groove, one of them side of assembly heavy groove is provided with first screw thread section, inlay at the bottom of assembly heavy groove and be equipped with the sealing strip, the upper portion of stirring barrel is provided with the second screw thread section that matches with the first screw thread section, and the stirring barrel top with the sealing strip laminating is sealed; the cover body is provided with a base, and the stirring barrel body is provided with a base or/and a handle.

By adopting the technical scheme, the beneficial effects are as follows:

(1) this application structural design is reasonable, can ensure the vacuum in the churn invariable, improves the mixture quality after the stirring, optimizes the structure of product, improves life and the convenience of use. Through the setting of gas tightness bearing, can overcome the loss problem of the vacuum in the churn that leads to because of bearing gas leakage among the prior art, can also set up the seal box and make the structure obtain further sealedly.

(2) The utility model provides a vacuum pump and the integrative connected mode of stirring barrel can overcome the loss of the stirring in-process vacuum degree that split type connection leads to realize continuous evacuation, maintain the invariant of the internal vacuum degree of stirring barrel, this application is through the setting of digital vacuum meter (vacuometer), can show in real time and transmit the internal vacuum degree of stirring barrel among the stirring process, thereby makes vacuum obtain control and keep invariable.

(3) By arranging the dust collection unit, dust in the stirring cylinder can be removed before vacuumizing, the vacuum pump is prevented from being sucked and damaged, and a better vacuumizing effect is achieved; the arrangement of the exhaust silencing valve on the vacuum pump can eliminate the noise generated during vacuum pumping as much as possible, and obtain better environmental effect.

(4) The arrangement of the solid material supply unit and the liquid material supply unit which can accurately control the material quantity and the water supply quantity can ensure that the mixing proportion of the ultra-high performance concrete (UHPC) is consistent with the designed mixing proportion, and a high-quality mixture is obtained; the liquid material supply unit with the function of controlling the water pressure and the flow is convenient for not only feeding water and mixing materials, but also washing the stirring cylinder body clean.

(5) This application has realized the application of different scenes to the structural design of the difference of stirring barrel and lid, and the ground paste of being convenient for flows smoothly to the bottom spherical crown shape structure of stirring barrel, also does benefit to and washes the stirring barrel clean.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments of the present invention will be briefly described below. The drawings are intended to depict only some embodiments of the invention, and not all embodiments of the invention are limited thereto.

FIG. 1 is a schematic structural view of a vacuum mixer for ultra-high performance concrete according to an embodiment of the present invention;

FIG. 2 is an enlarged schematic view of part A in FIG. 1

FIG. 3 is a cross-sectional view of section B-B of FIG. 1;

FIG. 4 is a second schematic structural view of a vacuum mixer for ultra-high performance concrete according to an embodiment of the present invention;

fig. 5 is a third schematic structural view of a vacuum mixer for ultra-high performance concrete according to an embodiment of the present invention.

In the figure: 1-solid material supply equipment; 2-air-tight material valve; 3-a stirring motor; 4-liquid material feeding equipment; 5-gas tight bearing; 6-cover body; 7-stirring shaft; 8-a spray head; 9-stirring blades; 10-a strut; 11-stirring the cylinder; 12-a discharge door; 13-sealing ring; 14-a rotating shaft; 15-pop-open unit; 16-a limit table; 17-anti-falling lockpin; 18-a first compression spring; 19-gas valve; 20-a reversing valve; 21-an airflow control valve; 22-vacuum degree instrument; 23-a vacuum valve; 24-a dust extraction unit; 25-a gas-collecting hood; 26-a vacuum pump; 27-exhaust silencing valve; 28-a base; 29-a controller; 30-a microcomputer; 31-a hoop; 32-stirring cylinder sealing tape; 33-a threaded connection; 34-fixing the lock catch; 35-a handle; 36-base, 37-evacuation tube, 38-spacing pin.

Detailed Description

The embodiments of the present invention will be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the invention are shown. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art.

In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for describing various elements of the present invention, and do not denote any order, quantity, or importance, but rather are used to distinguish one element from another.

It should be noted that when an element is referred to as being "connected," "coupled," or "connected" to another element, it can be directly connected, coupled, or connected, but it is understood that intervening elements may be present therebetween; i.e., positional relationships encompassing both direct and indirect connections.

It should be noted that the use of the terms "a" or "an" and the like do not necessarily denote a limitation of quantity. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items.

It should be noted that terms indicating orientation or positional relationship such as "upper", "lower", "left", "right", and the like, are used only for indicating relative positional relationship, which is for convenience of describing the present invention, and not that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation; when the absolute position of the object to be described is changed, the relative positional relationship may also be changed accordingly.

Referring to fig. 1-5, the application relates to a vacuum mixer for ultra-high performance concrete, which comprises a mixing cylinder 11, a mixing component, a vacuumizing component and a feeding component, wherein a cover body 6 is arranged at the top of the mixing cylinder; the stirring assembly is arranged in the stirring cylinder body and used for stirring and mixing the mixture, and a sealing unit is arranged between the stirring assembly and the stirring cylinder body; the vacuumizing assembly is connected with the stirring cylinder and is used for vacuumizing the stirring cylinder; the feeding assembly is connected with the stirring cylinder body through a material conveying pipeline, and a sealing valve is arranged on the material conveying pipeline.

The stirring assembly in the embodiment comprises a stirring shaft, a stirring motor and stirring blades, wherein the stirring shaft is arranged on the cover body through a bearing; the stirring motor is arranged on the cover body and is in transmission connection with the stirring shaft; the stirring paddle is arranged on the stirring shaft. The stirring motor in the application is preferably a servo motor, and a stepping motor can also be adopted. Wherein, the stirring paddle 9 comprises a helical blade, the helical blade is arranged on the stirring shaft 7, and a plurality of groups of supporting rods 10 are also arranged between the helical blade and the stirring shaft; the sealing unit is a sealing box arranged on the cover body outside the stirring motor, or/and the sealing unit is an airtight bearing 5 arranged between the stirring shaft and the cover body.

Specifically, the structure and function of the stirring assembly will be described in detail: the stirring assembly comprises a power device (namely a stirring motor 3), an airtight bearing 5, a stirring shaft 7, a stirring blade 9 and a support rod 10. Power device fixed connection just lies in stirring barrel top center on the upper portion of lid 6, the stirring main shaft who is connected as an organic whole with power device passes the gas tightness bearing and goes deep into the stirring barrel and lie in the axis of stirring barrel, banded stirring paddle leaf uses the stirring main shaft to receive the stirring main shaft end of stirring barrel bottom center top from last down heliciform as the center, stirring paddle leaf is branch and stirring main shaft fixed connection that the cross was arranged through the level, but every branch is not on a plane to the vertical, and is the spiral arrangement along with the paddle around the main shaft together, as figure 3. The horizontal direction of the strip-shaped blade has a certain inclination angle with the horizontal plane, and the outer edge of the strip-shaped blade is contacted with the inner wall of the stirring cylinder body. The power device mainly comprises a servo motor, can realize the regulation and control of the rotating speed and the steering by means of a control system, can enable different mixtures to obtain ideal mixing effects by reasonably designing and regulating the slow-speed, medium-speed and high-speed stirring processes, and can improve the mixing and discharging efficiency by timely switching the blade steering.

The vacuum-pumping assembly in this embodiment comprises a vacuum-pumping tube and a vacuum pump 26, the vacuum-pumping tube 37 is fixedly arranged on the cover body 6, and the vacuum valve 23 is arranged on the vacuum-pumping tube; a vacuum pump 26 is provided at the outer end of the evacuation tube.

The vacuumizing tube is connected with a dust absorption unit through a reversing valve, and an airflow control valve 21 is arranged on a branch pipeline between the vacuumizing tube and the dust absorption unit; the vacuum-pumping pipe is also connected with a vacuum degree instrument 22 and a vacuum valve 23 through a branch pipeline, and the air outlet end of the vacuum pump is provided with an exhaust silencing valve 27.

The structure of the evacuation assembly and the function of the various components are described in detail below: the device specifically comprises an air valve 19, a reversing valve 20, an airflow control valve 21, a vacuum degree meter 22, a vacuum valve 23, a dust collection unit 24, a gas collecting hood 25, a vacuum pump 26, an exhaust silencing valve 27 and the like. The gas collecting hood arranged in the mixing cylinder is respectively connected with the gas valve and the reversing valve through a pipeline tee joint, the gas valve is a digital control type air valve, and when the gas valve is closed, the gas valve can enable the inside of the mixing cylinder to form a vacuum state through a vacuum pump, so that the mixing of the ultra-high performance concrete mixture is facilitated; when the mixing drum is opened, the normal pressure in the mixing drum is recovered, so that the mixed ultra-high performance concrete mixture can flow out from the discharge hole conveniently. One path of the reversing valve is connected with the dust collection unit through the airflow control valve, and the other path of the reversing valve is connected with the vacuum pump through the vacuum valve. A vacuum degree instrument with vacuum pressure sensing and digital display functions is connected between the vacuum valve and the reversing valve, and a valve with exhaust and noise reduction functions is arranged at an exhaust port of the vacuum pump. When powder materials are put into the stirrer, the air valve is closed, the reversing valve is connected with a pipeline connected with the dust collection unit, part of dust flows to the dust collection unit along with air flow, the spray head starts a spraying function before the powder is put into the stirrer and vacuumized, the influence of suspended fine dust on the vacuum pump is eliminated, and the water consumption is strictly calculated within the mixing ratio of the ultrahigh-performance concrete.

The feeding assembly in the embodiment comprises a solid material supply unit and a liquid material supply unit, wherein the solid material supply unit comprises a solid material conveying pipeline, a solid material sealing valve arranged on the solid material conveying pipeline, and solid material feeding equipment connected with the solid material conveying pipeline; the liquid material supply unit comprises a liquid material conveying pipeline, a liquid material sealing valve arranged on the liquid material conveying pipeline and liquid material supply equipment connected with the liquid material conveying pipeline.

The solid material supply equipment comprises material bins, a conveyor, metering equipment, solid material storage tanks and solid material control valves, wherein the material bins are communicated with the solid material storage tanks through the corresponding conveyor and the metering equipment; the inner end part of the liquid material conveying pipeline is provided with a liquid material spray head, the liquid material feeding device comprises stock tanks, flow pumps and liquid material storage tanks, and the stock tanks are communicated with the liquid material storage tanks through the corresponding flow pumps.

The structure and function of the feeding assembly is explained in detail as follows: the solid material supply unit mainly comprises solid material supply equipment 1, an air tightness material valve 2, a material pipe and the like. The lower part of the solid material supply equipment is connected with an air tightness material valve, and then the material valve penetrates into the stirring cylinder body through a material pipe. The solid material supply equipment is connected with a storage bin for storing different types of solid materials (granules and powder), and can be used for supplying materials after premixing according to different ultra-high performance concrete particle compositions and also can be used for independently and sequentially supplying materials. The supply quantity of each solid material can be accurately controlled by a metering sensor, an air-tight material valve and a program set by a control system which are configured on the solid material supply equipment, the material quantity requirement of the mix proportion design is met, the proportioned materials can be stored in a solid material storage tank, and the blanking is controlled by a solid material control valve.

The liquid material supply unit mainly comprises a liquid material supply device 4, a liquid conveying pipeline, a control valve, a spray head 8 and the like. The liquid material feeder can be by the water tank, the water pump (the two can be replaced by the running water pipeline), store the head tank of various admixtures, liquid material storage tank, pressure mediation valve, the solenoid valve, flow meter etc. and accessible control system carries out the preliminary mixing treatment with various liquid materials according to the requirement of mix proportion after sending the shower nozzle to use through oil pipeline, also can carry the stirring of participation mixture in the churn to different liquid materials in proper order, the accurate control of various liquid material supply volumes provides the guarantee for stirring out the ultra high performance concrete mixture that the performance satisfies the design requirement. The spray head is an intelligent control spray head and has functional modes of splashing, spraying, atomizing and the like so as to realize different purposes. When the mixture is mixed, the spray head is used for enabling the solid material to be contacted with water more uniformly and fully during mixing in a spraying mode, so that the mixing quality and efficiency of the mixture are improved, and after the discharging is finished, the mixing cylinder is flushed by tap water in a splashing mode, so that the flushing efficiency of the mixing cylinder is also improved; different raw materials can be matched and then stored in the liquid material discharging pipe, and then the liquid material sealing valve controls feeding.

The bottom of the stirring cylinder body in the embodiment is provided with a discharge hole and a discharge assembly, the discharge assembly comprises a discharge door 12, a limiting table 16, an anti-falling lock pin 17 and an ejecting unit, and the discharge door 12 is hinged with the stirring cylinder body 11; the limiting table 16 is arranged at the bottom of the stirring barrel and corresponds to the movable end of the discharge door; the anti-falling lock pin 17 is arranged on the limiting table in a sliding mode, a first compression spring 18 is arranged between the anti-falling lock pin and the limiting table, the first compression spring 18 drives the anti-falling lock pin to keep an extending state, and the anti-falling lock pin is supported on the lower portion of the discharge door in a limiting mode when the discharge door is in a closed state; the bouncing unit is arranged at the hinged end part of the discharging door, and the bouncing unit 15 is a torsion spring or a second compression spring. The discharge port is conical, a sealing frustum is arranged at the upper part of the discharge door, an annular sealing groove is arranged on the sealing frustum, and sealing filler or a sealing ring 13 is arranged in the annular sealing groove.

As to the structure and function of the discharging assembly, as shown in FIG. 2, the discharging door is movably connected with the mixing drum through the rotating shaft 14 and can be smoothly pressed into the discharging hole of the mixing drum. For forming closely cooperating, the vertical direction design of discharge gate and discharge gate is coniform or square cone column structure, and the circumference that discharge gate and discharge gate contacted sets up the recess, sets up sealing washer 13 in the recess to guarantee sufficient gas tightness. In order to ensure that the discharge door has enough opening degree and can be opened at high speed during discharging, an ejection unit 15 is arranged between the discharge hole and the discharge door around the rotating shaft, and the ejection unit is an elastic element. In order to prevent the discharge door from being flicked or falling off in the stirring process, the outer edge of the discharge hole at the side opposite to the rotating shaft is provided with an anti-dropping lock pin 17. Set up spacer pin 38 at the discharge door expansion end corresponding position, be convenient for impress the discharge gate smoothly with the discharge door, the one side of spacer pin and anticreep lockpin contact all designs for the cambered surface, and the anticreep lockpin is controlled with external force in the first compression spring of accessible in the guide slide, and when the discharge door was impressed in the discharge gate, the locking discharge door of anticreep lockpin under first compression spring's drive makes the churn body form inclosed material cavity of mixing.

Different structures are provided for the fixing mode of the cover body and the stirring cylinder body, the structure can adopt an integral structure design or a split structure design, and when the integral structure design is adopted, a base 28 can be arranged on the stirring cylinder body or the cover body; when the split structure design is adopted, the bottom of the cover body is provided with a hoop 31, the bottom of the hoop is provided with an assembly sinking groove, one side of the assembly sinking groove is provided with a first thread section, the bottom of the assembly sinking groove is embedded with a sealing belt 32, the upper part of the stirring cylinder body is provided with a second thread section matched with the first thread section, and the top of the stirring cylinder body is attached and sealed with the sealing belt; the cover body is provided with a base 28, and the stirring cylinder body is provided with a base 36 or a handle 35.

To above-mentioned components of a whole that can function independently, the feeding subassembly of this application can not set up to when reinforced or the ejection of compact, direct separation lid and stirring barrel.

The structure of the different forms described above is explained in detail below:

referring to fig. 4, the present embodiment is substantially the same as fig. 1 except that: the stirring cylinder body and the cover body adopt a split design. The stirring cylinder body is connected with the cover body through a threaded connection structure 33, in order to avoid pollution of slurry to a contact part, the bottom of the cover body is provided with a hoop, the hoop is provided with an assembly sinking groove corresponding to the stirring cylinder body, and in order to guarantee the vacuum degree, the bottom of the assembly sinking groove is provided with an annular stirring cylinder body sealing belt 32. In order to facilitate the disassembly and assembly of the stirring cylinder body, 1-2 pairs of handles can be respectively arranged on the outer side wall of the stirring cylinder body according to the capacity. In order to avoid the dropping of the stirring cylinder during stirring, one side of the hoop is provided with a fixed lock catch 34, and meanwhile, the rotating direction of the propeller blade can be set to be consistent with the screwing direction of the stirring cylinder during stirring.

See fig. 5. Basically the same as in fig. 4, except that: in order to meet the requirement of mixing smaller-capacity ultra-high-performance concrete mixtures, the bottom of the stirring cylinder body is not provided with a discharge door, and a base 36 convenient for stably placing the stirring cylinder body is arranged.

The setting of this application control system can guarantee that feed, water supply, evacuation etc. can be implemented accurately, ensures to mix out the Ultra High Performance Concrete (UHPC) mixture that satisfies the designing requirement.

Specifically, the control system includes a controller 29 and a microcomputer 30, and various sensors and the like connected to the stirring assembly, the solid material supply unit, the liquid material supply unit, and the vacuum pumping assembly, respectively. The various sensors transmit the acquired analog signals of the motor rotating speed, the material flow, the vacuum degree and the like to the controller through cables, the controller records and stores data after digital-to-analog signal conversion and displays the data in real time through a display of a microcomputer, and meanwhile, the control system accurately regulates and controls the actions of functional components of the motor rotating speed, the material flow, the vacuum degree and the like according to feedback signals.

The method for using the vacuum mixer for the ultra-high performance concrete (UHPC) of the utility model comprises the following steps:

(1) preparing enough raw materials according to the mixing ratio requirement, and respectively placing the raw materials into a solid material supply unit and a liquid material supply unit.

(2) And closing a discharge door and an air valve of the stirring cylinder, opening a pipeline connected with the dust collection unit by a reversing valve, and opening an airflow control valve.

(3) And controlling a solid material supply unit to feed solid raw materials according to the characteristics of the prepared ultra-high performance concrete.

(4) And opening the dust collection unit for dust removal.

(5) The spray head of the liquid material supply unit starts a tap water spray mode to eliminate extremely fine floating dust particles.

(6) The reversing valve is communicated with a vacuum pump for vacuumizing, and the vacuum valve is closed after the design requirement is met.

(7) Starting the stirring component, adding the liquid raw materials in a spraying mode while stirring, and sequentially stirring at a low speed, a medium speed and a high speed according to a set program, wherein a vacuum pump can be continuously started to maintain the vacuum degree constant if the vacuum degree is insufficient in the period.

(8) And after stirring, closing the vacuumizing assembly and opening the air valve.

(9) The discharge door is opened to discharge, and the stirring component can be opened to enable the paddle to be reversed to assist in discharging.

(10) And after the discharging is finished, opening the spray head to wash the stirring cylinder body till the stirring cylinder body is clean.

The above operation steps can be automatically completed by the control of a microcomputer through a designed program.

To other embodiments, change the utility model discloses a concrete specification, size, form etc. of constitutions such as vacuum mixer for ultra high performance concrete's lid, stirring subassembly, solid material supply unit, liquid material supply unit, evacuation subassembly and control system, if with the base setting under the stirring barrel, or add clear glass on the stirring barrel wall and survey the mouth, or will stir the barrel by a specific material like the preparation of transparent toughened glass, be the utility model discloses a common change, a detailed description differs here.

While the above description has described in detail the preferred embodiments for carrying out the invention, it should be understood that these embodiments are presented by way of example only, and are not intended to limit the scope, applicability, or configuration of the invention in any way. The scope of the invention is defined by the appended claims and equivalents thereof. Many modifications may be made to the foregoing embodiments by those skilled in the art in light of the teachings of the present disclosure, and such modifications are intended to be within the scope of the present disclosure.

Claims (10)

1. A vacuum mixer for ultra-high performance concrete, comprising:

the stirring cylinder is provided with a cover body at the top;

the stirring assembly is arranged in the stirring cylinder body and used for stirring and mixing a mixture, and a sealing unit is arranged between the stirring assembly and the stirring cylinder body;

the vacuumizing assembly is connected with the stirring cylinder and is used for vacuumizing the stirring cylinder; and

and the feeding assembly is connected with the stirring cylinder body through a material conveying pipeline, and a sealing valve is arranged on the material conveying pipeline.

2. The vacuum mixer for ultra-high performance concrete according to claim 1, wherein the mixing assembly comprises:

the stirring shaft is arranged on the cover body through a bearing;

the stirring motor is arranged on the cover body and is in transmission connection with the stirring shaft; and

and the stirring paddle is arranged on the stirring shaft.

3. The vacuum mixer for ultra-high performance concrete according to claim 2, wherein the mixing blade comprises a helical blade, the helical blade is disposed on the mixing shaft, and a plurality of sets of struts are further disposed between the helical blade and the mixing shaft;

the sealing unit is a sealing box arranged on the cover body outside the stirring motor, or/and the sealing unit is an airtight bearing arranged between the stirring shaft and the cover body.

4. The vacuum mixer for ultra-high performance concrete according to claim 1, wherein the evacuation assembly comprises:

the vacuumizing pipe is fixedly arranged on the stirring cylinder body and is provided with a vacuum valve; and

and the vacuum pump is arranged at the outer end part of the vacuumizing pipe.

5. The vacuum mixer for ultra-high performance concrete according to claim 4, wherein a dust suction unit is connected to the evacuation pipe through a reversing valve, and an airflow control valve is provided on a branch pipe between the evacuation pipe and the dust suction unit; the vacuum pumping pipe is also connected with a vacuum degree instrument and a vacuum valve through branch pipelines, and an exhaust silencing valve is arranged at the air outlet end of the vacuum pump.

6. The vacuum mixer for ultra-high performance concrete according to claim 1, wherein the feed assembly includes a solid feed unit and a liquid feed unit, the solid feed unit includes a solid feed pipeline, a solid seal valve disposed on the solid feed pipeline, and a solid feed device connected to the solid feed pipeline;

the liquid material supply unit comprises a liquid material conveying pipeline, a liquid material sealing valve arranged on the liquid material conveying pipeline, and liquid material supply equipment connected with the liquid material conveying pipeline.

7. The vacuum mixer for ultra-high performance concrete according to claim 6, wherein the solid material feeding device comprises bins, conveyors, metering devices, solid material storage tanks and solid material control valves, and the bins are communicated with the solid material storage tanks through the corresponding conveyors and metering devices; the inner end part of the liquid material conveying pipeline is provided with a liquid material nozzle, the liquid material feeding device comprises a stock tank, a flow pump and a liquid material storage tank, and the stock tanks are communicated with the liquid material storage tank through the corresponding flow pumps.

8. The vacuum mixer for ultra-high performance concrete according to claim 1, wherein a discharge port and a discharge assembly are provided at the bottom of the mixing drum, the discharge assembly comprising:

the discharge door is hinged with the stirring barrel;

the limiting table is arranged at the bottom of the stirring barrel and corresponds to the movable end of the discharge door;

the anti-falling lock pin is arranged on the limiting table in a sliding mode, a first compression spring is arranged between the anti-falling lock pin and the limiting table, the first compression spring drives the anti-falling lock pin to keep an extending state, and the anti-falling lock pin is limited and supported on the lower portion of the discharging door in a closed state of the discharging door; and

the ejection unit is arranged at the hinged end part of the discharge door and is a torsion spring or a second compression spring;

the discharge gate is the toper, discharge gate upper portion is provided with sealed frustum, be provided with annular seal groove on the sealed frustum be provided with sealing filler or sealing washer in the annular seal groove.

9. The vacuum mixer for ultra-high performance concrete according to claim 8, wherein the cover and the mixing cylinder are integrally constructed, and a base is provided on the mixing cylinder or the cover.

10. The vacuum mixer for ultra-high performance concrete according to claim 1 or 8, wherein the cover body and the mixing cylinder body are of a split structure, a hoop is arranged at the bottom of the cover body, an assembly sinking groove is arranged at the bottom of the hoop, a first thread section is arranged on one side of the assembly sinking groove, a sealing strip is embedded at the bottom of the assembly sinking groove, a second thread section matched with the first thread section is arranged at the upper part of the mixing cylinder body, and the top of the mixing cylinder body is in fit sealing with the sealing strip; the cover body is provided with a base, and the stirring barrel body is provided with a base or/and a handle.

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