CN214136647U - Forced vacuum mixer for preparing 3D printed ultra-high performance concrete - Google Patents

Abstract

The utility model relates to a 3D prints concrete technical field. A forced vacuum mixer for preparing 3D printed ultra-high performance concrete comprises a mixing cylinder, a mixing component, a vacuumizing component, a feeding component, a discharging component and a control system, wherein a discharging port is formed in the bottom of the mixing cylinder; the stirring assembly is arranged in the stirring cylinder body, and a sealing unit is arranged between the stirring assembly and the stirring cylinder body; the vacuumizing assembly is connected with the stirring cylinder; the feeding assembly is connected with the stirring barrel through a material conveying pipeline. This application structural design is reasonable, can realize the sealed stirring of vacuum of whole stirring subassembly, and intelligent control system can realize carrying out accurate regulation and control to the action of each subassembly and unit to reduce the bubble that exists in the mix material, improve homogeneity, compactness, intensity and the durability of concrete, the specially adapted mixes the system of mixing that fibrous ultra high performance concrete and 3D printed ultra high performance concrete mixture.

Description

Forced vacuum mixer for preparing 3D printed ultra-high performance concrete

Technical Field

The utility model relates to a 3D prints concrete technical field, especially relates to a forced vacuum mixer that preparation 3D printed ultra high performance concrete.

Background

The future development of traditional concrete is restricted by the defects of high consumption of resources and energy sources, high pollution to the environment and the like of the traditional concrete, the third industrial revolution taking additive manufacturing such as 3D printing and the like as a mark leads the concrete technology to advance to a higher level, the novel 3D concrete printing technology based on three-dimensional modeling, electromechanical control, information processing, material science and the like is developed, the building and the member are three-dimensionally modeled by means of a computer, and the prepared concrete mixture is printed to a preset position layer by layer according to a set program by an intelligently controlled 3D printing device, so that the concrete building or the member product is finally obtained. The 3D printing concrete technology can accurately calculate the consumption of raw materials before construction, can regulate and control the performance and the consumption of the mixture during printing, does not need template support and vibration, is convenient for construction of complex components, can furthest realize energy conservation and material conservation, and can realize optimization of a structure during printing. However, 3D printing concrete as an emerging technology has not yet matured either in materials or preparation equipment. 3D prints and has had higher requirement to the concrete performance, and traditional concrete has been difficult to satisfy, and the design and the construction of 3D printing concrete have not been guided well to current theory. For example, 3D printed concrete must have excellent thixotropy, that is, sufficient rheological property for extrusion from a nozzle during printing, and after printing, the concrete can be rapidly solidified and hardened in air, and has sufficient volume stability and appropriate early strength, and can bear the weight of the concrete and subsequent layers, and prevent excessive accumulated deformation and instability phenomena such as collapse and inclination. The front and rear printing layers should have good interface bonding performance and high reference strength to avoid strength attenuation caused by interface transition layers. The ultra-high performance concrete (UHPC) with better rheological property, higher strength and excellent durability becomes a more ideal choice for 3D printing concrete, but the UHPC adds high-activity micro powder such as silica fume and the like for obtaining a compact microstructure, adopts lower water-to-gel ratio for improving the strength, and adds more additives for meeting the rheological property requirement, so that the total amount of a cementing material and the additive consumption are far higher than those of the conventional concrete, the mixture is more viscous, and bubbles introduced in the stirring process are more difficult to eliminate. Generally, the air introduced has a significant influence on both the workability of fresh concrete and the quality of the hardened concrete, in particular on the strength.

Researches show that the content of bubbles in the mixture can be effectively eliminated and the pore size of the bubbles can be reduced by adopting the measure of reducing the atmospheric pressure in the stirring process, so that the performance of the hardened concrete is improved. To this end, researchers have 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 aims to improve the compactness, strength and durability of concrete. However, the forced concrete vacuum mixer has the structural characteristics 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. Meanwhile, the feeding and stirring procedures of the application also influence the performance of concrete, and are not 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 the rotation of the mixing drum during the mixing process also needs to complete vacuum pumping before mixing, and because the vacuum pumping cannot be continuously performed, the loss of vacuum degree during the water adding and mixing process still can be caused, so that the effect of eliminating bubbles in the mixture is still limited, especially the relatively low rotating speed of the mixing drum and the lack of the piercing effect of forced blades on bubbles determine that the mixer is not suitable for mixing UHPC mixture with larger viscosity, especially fibers.

Therefore, in order to promote the development and application of the 3D printing concrete technology, a new forced vacuum mixer which is reasonable in structure, environment-friendly, efficient and more suitable for preparing a 3D printing ultra-high performance concrete (UHPC) mixture is needed to be developed.

Disclosure of Invention

The utility model aims at the problem that above-mentioned exists and not enough, provide a forced vacuum mixer that preparation 3D printed ultra high performance concrete, its structural design is reasonable, can realize the vacuum seal stirring of whole stirring subassembly to reduce the bubble that exists in the mix material, improve homogeneity, closely knit nature, intensity and the durability of concrete.

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

a forced vacuum mixer for preparing 3D printed ultra-high performance concrete comprises:

the stirring cylinder is provided with a discharge hole at the bottom;

the stirring assembly is arranged in the stirring cylinder body, 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 discharging assembly is arranged at the discharging opening and used for sealing the discharging opening; and

and the control system is used for controlling each component.

According to the utility model discloses preparation 3D prints compulsory vacuum mixer of ultra-high performance concrete, preferably, the stirring subassembly includes:

the stirring shaft is connected with the stirring barrel through a bearing;

a stirring paddle arranged on the stirring shaft; and

and the stirring motor is arranged outside the stirring barrel body and is in transmission connection with the stirring shaft.

According to the utility model discloses prepare 3D and print forced vacuum mixer of ultra high performance concrete, preferably, the (mixing) shaft includes coaxial horizontal arrangement's first main shaft and second main shaft, be provided with the gear box through the connection of gear box vaulting pole in the churning barrel, first main shaft and second main shaft all with churning barrel and gear box all through the bearing connection, gear box with the churning barrel between connect fixedly through the gear box vaulting pole; a driving gear and a driven gear are respectively arranged on the first main shaft and the second main shaft, and a reversing gear which is matched and meshed with the driving gear and the driven gear is arranged in the gear box;

the first main shaft and the second main shaft are both provided with at least one group of stirring blades, the number of each group of stirring blades is at least two, and each stirring blade comprises a blade support rod and a material stirring plate;

the sealing unit is a sealing cover arranged on the stirring cylinder body outside the stirring motor, and each bearing is a sealing bearing.

According to the utility model discloses preparation 3D prints compulsory vacuum mixer of 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 forced vacuum mixer for preparing 3D printed ultra-high performance concrete of the utility model, preferably, the vacuum-pumping tube is connected with a dust-absorbing unit through a reversing valve, and an airflow control valve is arranged on a branch pipeline between the vacuum-pumping tube and the dust-absorbing unit; the vacuum pumping pipe is also connected with a vacuum degree instrument and an air 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 prepare forced vacuum mixer that 3D printed 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, sets 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 prepare 3D and print forced vacuum mixer of 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 the feed bin 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 preparation 3D prints compulsory vacuum mixer of ultra-high performance concrete, preferably, ejection of compact subassembly includes:

the bottom of the stirring barrel body on one side of the discharge port is provided with a rotating shaft support, a discharge door rotating shaft is arranged on the rotating shaft support through a bearing, and the discharge door is arranged on the discharge door rotating shaft;

the stirring cylinder body is provided with a stirring cylinder body, a locking pin is arranged at the lower part of the discharging door in a sliding manner, a discharging door stop block is arranged at the bottom of the stirring cylinder body, and a stop block groove corresponding to one end part of the locking pin is formed in the discharging door stop block;

a first driving part for driving the discharge door to rotate; and

and a second driving part for driving the lock pin to slide left and right.

According to the utility model discloses preparation 3D prints compulsory vacuum mixer of ultra-high performance concrete, preferably, first drive division includes:

the discharge door control motor is arranged at the bottom of the stirring barrel and is in transmission connection with the discharge door rotating shaft; and

the discharge door is connected with the discharge door rotating shaft through a ratchet wheel set;

the second driving part includes:

the outer teeth of the discharging door rotating shaft are arranged in the middle of the discharging door rotating shaft, the outer teeth of the discharging door rotating shaft are a section which is concentric with the discharging door rotating shaft, and a lock pin toothed belt matched with the outer teeth of the discharging door rotating shaft is arranged on the lock pin;

the lock pin limiting wheel is arranged at the lower part of the lock pin and corresponds to the rotating shaft of the discharging door; and

the lower part of the discharge door is provided with two lock pin limiting blocks, the lock pins are arranged in the lock pin limiting blocks in a sliding manner, the first compression spring is sleeved on the lock pins between the two lock pin limiting blocks, the end parts of the lock pins close to the discharge door limiting blocks are provided with limiting convex rings, and the first compression spring and the limiting convex rings are correspondingly attached for limiting;

the discharge hole is conical, a sealing frustum matched with the discharge hole is arranged on the upper side of the discharge door, an annular sealing groove is formed in the sealing frustum, and sealing filler or a sealing ring is arranged in the annular sealing groove; the lower part of the discharge door stop block is provided with an arc-shaped driving surface, and the upper part of the end part of the lock pin is provided with an arc-shaped leading-in surface corresponding to the arc-shaped driving part;

and a second compression spring is arranged between the end part of the discharge door close to the discharge door rotating shaft and the stirring cylinder body.

According to the utility model discloses preparation 3D prints compulsory vacuum mixer of ultra-high performance concrete, preferably, control system includes:

a microcomputer;

a controller; and

the system comprises a stirring assembly, a solid material supply unit, a liquid material supply unit and a vacuumizing assembly, wherein the stirring assembly is used for stirring the liquid material, the solid material supply unit is used for supplying the liquid material, the vacuumizing assembly is used for vacuumizing the liquid material, the stirring assembly is used for stirring the liquid material, the solid material supply unit is used for vacuumizing the liquid material, the liquid material supply unit is used for vacuumizing the liquid material, the vacuumizing assembly is used for vacuumizing the liquid material, the sensors are used for respectively transmitting acquired analog signals to a controller through cables, the controller is used for recording and storing data after digital-to-analog signal conversion, the data are displayed in real time through a display of a microcomputer, and meanwhile, the control system is used for regulating and controlling the functions of the assemblies according to feedback signals.

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

(1) the stirring assembly is reasonable in overall structural design, vacuum sealing stirring of the whole stirring assembly can be realized, and the constant vacuum degree in the stirring cylinder is guaranteed, so that bubbles in the mixed materials are reduced, and the homogeneity, compactness, strength and durability of concrete are improved; this application is through setting up bearing seal box and driving system seal box, can overcome the vacuum loss problem in the churn that leads to because of the bearing gas leakage among the prior art.

(2) The vacuum pump and the stirring cylinder are arranged integrally, so that continuous vacuum pumping can be realized in the stirring process, and the problem that the vacuum degree in the stirring cylinder cannot be maintained constant in the stirring process due to split arrangement is solved; the setting of digital vacuum degree instrument is adopted in this application, can show in real time and transmit the vacuum degree in the churn among the stirring process to make vacuum degree obtain control and keep invariable.

(3) The utility model discloses the paddle structure of stirring subassembly can make UHPC mixture form the multilayer circulation flow at the stirring in-process, and balanced shear resistance makes power consumption still less. The reverse rotation of the left paddle and the right paddle can also enable the UHPC mixture to form convection circulation and turbulent diffusion, thereby obtaining higher stirring efficiency and better stirring effect.

(4) The vacuum pump is also provided with the dust collection unit, so that dust in the mixing drum can be removed before vacuum pumping, the vacuum pump is prevented from being sucked and damaged, and a better vacuum pumping 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.

(5) This application has carried out new design to the structural style of stirring barrel for it more does benefit to and improves the stirring effect, and the ground paste of being convenient for flows smoothly and washes the churn clean, can carry out corresponding change to the structure of inside according to the size of stirring barrel, thereby makes to form between the power of mix material viscosity and power equipment balanced, optimizes the performance of equipment.

(6) The intelligent accurate of ejection of compact door-trip has been realized in setting up of this application ejection of compact subassembly, has also improved production efficiency, has ensured the stability of structural assembly for the sealing performance of discharge gate obtains the guarantee.

(7) The utility model discloses super high performance is forced vacuum mixer's each functional unit all through electromechanical control for the concrete, more is suitable for the UHPC industry of intelligent control production, and especially 3D prints UHPC industry.

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 one embodiment of the forced vacuum mixer for 3D printing of ultra-high performance concrete of the present invention;

FIG. 2 is an enlarged schematic view of the portion A of the gear box of FIG. 1;

FIG. 3 is an enlarged schematic view of the discharge assembly and discharge door of section B of FIG. 1;

FIG. 4 is a schematic structural view of section C-C of FIG. 1;

fig. 5 is an enlarged schematic view of a portion D in fig. 4.

Number in the figure:

1-air valve, 2-gas collecting hood, 3-reversing valve, 4-airflow control valve, 5-dust collection unit, 6-vacuum degree instrument, 7-vacuum valve, 8-vacuum pump, 9-exhaust muffler valve, 10-gear box support rod, 11-bearing seal box, 12-left main shaft bearing, 13-left main shaft, 14-gear box, 15-left paddle, 16-stirring cylinder, 17-discharging component, 18-solid material supply unit, 19-solid material seal valve, 20-liquid material supply device, 21-liquid material control valve, 22-liquid material storage tank, 23-liquid material seal valve, 24-liquid material spray head, 25-right paddle, 26-power unit seal box, 27-stirring motor, 28-right main shaft bearing, 29-right main shaft, 30-stirring barrel bracket, 31-discharging door, 32-microcomputer, 33-controller, 34-reversing gear bearing, 35-reversing gear, 36-driven gear bearing, 37-driven gear, 38-driving gear bearing, 39-driving gear, 40-second compression spring, 41-discharging component bracket, 42-ratchet group, 43-discharging door rotating shaft, 44-discharging door rotating shaft external tooth, 45-lock pin toothed belt, 46-lock pin limiting wheel, 47-lock pin, 48-discharging door sealing ring, 49-drip edge, 50-discharging door block, 51-discharging door block groove, 52-lock pin head, 53-lock pin limiting block, 54-first compression spring, 55-blade supporting rod, supporting rod, 56-material turning plate, 57-discharge door control motor bracket, 58-discharge door control motor, 59-discharge door rotating shaft bearing, 60-discharge door rotating shaft bracket and 61-lock pin limiting wheel bracket.

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 discloses a forced vacuum mixer for preparing 3D printed ultra-high performance concrete, which comprises a mixing cylinder 16, a mixing component, a vacuumizing component, a feeding component, a discharging component and a control system, wherein a discharging port is arranged at the bottom of the mixing cylinder; the stirring assembly is arranged in the stirring cylinder, and a sealing unit is arranged between the stirring assembly and the stirring cylinder; 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 through a material conveying pipeline, and a sealing valve is arranged on the material conveying pipeline; the discharging component is arranged at the discharging port and used for sealing the discharging port.

The control system in the embodiment comprises a microcomputer, a controller, various sensors and the like, wherein the sensors are respectively connected with the stirring assembly, the solid material supply unit, the liquid material supply unit and the vacuumizing assembly. The various sensors transmit acquired analog signals (motor rotating speed, material flow, 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 actions of functional components such as the motor rotating speed, the material flow, the vacuum degree and the like according to feedback signals.

Specifically, the stirring assembly in the embodiment comprises a stirring shaft, a stirring paddle and a stirring motor, wherein the stirring shaft is connected with the stirring cylinder through a bearing; the stirring paddle is arranged on the stirring shaft; the stirring motor is arranged outside the stirring barrel body and is in transmission connection with the stirring shaft. The structure of the stirring shaft and the stirring blades can adopt various different structural forms, such as a single stirring shaft, wherein platy blades or helical blades are arranged on the stirring shaft, and a double stirring shaft and double helical stirring blade structure which are arranged side by side can also be adopted; the arrangement direction of the stirring shafts can adopt horizontal arrangement or vertical arrangement.

Preferably, the stirring shaft in this embodiment includes a first main shaft and a second main shaft which are coaxially and horizontally arranged, a gear box is disposed in the stirring cylinder through a gear box support rod in a connecting manner, the first main shaft and the second main shaft are both connected with the stirring cylinder and the gear box through bearings, and the gear box is fixedly connected with the stirring cylinder through the gear box support rod; a driving gear and a driven gear are respectively arranged on the first main shaft and the second main shaft, and a reversing gear which is matched and meshed with the driving gear and the driven gear is arranged in the gear box. At least one group of stirring blades are arranged on the first main shaft and the second main shaft, the number of each group of stirring blades is at least two, and each stirring blade comprises a blade support rod and a material stirring plate; the sealing unit is a sealing cover which is arranged outside the stirring motor and connected to the stirring cylinder, and each bearing is a sealing bearing.

The following detailed description is made with respect to the specific structure of the stirring assembly:

the left and right ends of the lower part of the stirring cylinder 16 are spherical crown shaped, and the middle part is cylindrical. The structure is beneficial to the slurry to gather towards the middle part and be fully stirred, and is also beneficial to the outflow of the slurry. The upper part of the stirring cylinder body is in a rectangular barrel shape, so that the arrangement of systems such as material supply and the like is convenient. The stirring main shaft is arranged at the center of the lower semi-cylinder of the stirring cylinder body and comprises a left main shaft 13 and a right main shaft 29, the left main shaft and the right main shaft correspond to the first main shaft and the second main shaft, the right main shaft penetrates through a right main shaft bearing 28 arranged at the center of the spherical crown-shaped structure at the right lower part of the stirring cylinder body to be connected and fixed on the right outer wall of the stirring cylinder body and is in transmission connection with a stirring motor 27, and the stirring motor is a vacuum motor. The agitator motor is sealed in a power plant capsule 26. Set up the gear box in the churning barrel, the gear box passes through gear box vaulting pole 10 to be connected in churning barrel top center and be in the coplanar with left main shaft and right main shaft, plays support and positioning action to gear box 14, prevents that left main shaft and right main shaft are not on the same axis. The left end of the left main shaft penetrates through a left main shaft bearing 12 arranged in the center of a spherical crown structure at the left lower part of the stirring cylinder body, and a bearing sealing box 11 is arranged on the periphery of the left main shaft bearing to ensure air tightness. The gear box 14 is internally provided with a reversing gear bearing 34, a reversing gear 35, a driven gear bearing 36, a driven gear 37, a driving gear bearing 38 and a driving gear 39. The right main shaft penetrates into the gear box and penetrates through a driving gear bearing 38 to be connected with a driving gear 39, the driving gear is meshed with a reversing gear 35, a rotating shaft of the reversing gear penetrates through a reversing gear bearing 34, the reversing gear is meshed with a driven gear 37 and transmits rotation energy to the driven gear, and the left main shaft connected with the driven gear penetrates through a driven gear bearing 36. The reversing device composed of the gear box support rod 10, the gear box 14 and the like transmits the rotation energy of the right main shaft to the left main shaft, so that the left main shaft and the right main shaft realize coaxial reverse rotation. The left main shaft and the right main shaft are respectively provided with a left stirring blade 15 and a right stirring blade 25, the left stirring blade and the right stirring blade are not in a group, and the group number is determined by the size and the capacity of the stirring cylinder, the viscosity of the UHPC mixture, the power of the power device and the like. The left stirring paddle and the right stirring paddle are turbine six-branch type variable paddles, each branch is composed of a paddle support rod 55 and a material turning plate 56, the six paddles in the embodiment are divided into three groups according to the structural type, the lengths and the sizes of the paddle support rods and the material turning plates in the three groups are different, the lengths and the sizes of the paddle support rods and the material turning plates of the two paddles in each group are the same, and the blades are symmetrically arranged by taking the rotating shaft as the center. The length of the blade supporting rod forms gradient distribution in a plane vertical to the axial direction, and the size of the material turning plate forms gradient distribution in the circumferential direction around the shaft. The material turning plates are provided with sweepback angles and left and right inclination angles, the one-way discharge capacity of the mixture is improved, multi-layer circulating flow is formed, the size of the material turning plates is increased along with the shortening of the blade supporting rods, the shearing resistance can be balanced, and the power consumption is less. The relative reverse rotation of the left stirring blade and the right stirring blade can enable the UHPC mixture to form convection circulation and turbulent diffusion, and higher stirring efficiency and better stirring effect are obtained. The front flange of the stirring plate with the longest branch is tightly attached to the inner wall of the lower part of the stirring cylinder body, so that uneven stirring caused by bottom grabbing due to slurry adhesion is avoided.

The vacuumizing assembly in the embodiment comprises a vacuumizing pipe and a vacuum pump, wherein the vacuumizing pipe is fixedly arranged on the stirring cylinder body, and a vacuum valve is arranged on the vacuumizing pipe; the vacuum pump is arranged at the outer end part of the vacuumizing pipe.

Furthermore, the vacuum tube is connected with a dust collection unit through a reversing valve, and an airflow control valve is arranged on a branch pipeline between the vacuum tube and the dust collection unit; the vacuum pumping pipe is also connected with a vacuum degree instrument and an air valve through branch pipelines, and the air outlet end of the vacuum pump is provided with an exhaust silencing valve.

The structural connection form of the vacuum pumping assembly and the dust collection unit is further described, and specifically comprises an air valve 1, a gas collecting hood 2, a reversing valve 3, an airflow control valve 4, a dust collection unit 5, a vacuum degree instrument 6, a vacuum valve 7, a vacuum pump 8, an exhaust silencing valve 9 and the like. The gas collecting hood arranged in the mixing drum 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, a vacuum state can be formed in the mixing drum through a vacuum pump, so that the ultra-high performance concrete mixture can be conveniently mixed; 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 mixing drum, the air valve is closed, the reversing valve is connected with a pipeline connected with the dust collection unit, partial dust flows to the dust collection unit along with air flow, the spraying device arranged on the liquid material supply unit can be started before the powder materials are put into the mixing drum and vacuumized, the influence of suspended fine dust on the vacuum pump is eliminated, and the water consumption is strictly calculated in the mixing proportion of the ultra-high 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.

Further, the solid material supply device in this embodiment includes 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 end part of the liquid material conveying pipeline, which is positioned in the mixing drum body, is provided with a liquid material spray head, the liquid material feeding equipment comprises a raw material tank, a flow pump and a liquid material storage tank, and the raw material tank is communicated with the liquid material storage tank through the corresponding flow pump.

For the two structures of the feeding assembly, the following is further explained: the solid material supply unit in this embodiment is mainly composed of a solid material supply device 18, a solid material sealing valve 19, and the like. The solid material supply equipment comprises a storage bin, a conveyor, metering equipment, a solid material control valve and the like. The feed bin can be designed into a cylindrical structure, and can be used for independently setting granular aggregate, powdery cement, fly ash and the like respectively to play roles in storage, conveying and metering. The feed bin is internally provided with a material quantity measuring and controlling device and a solid material control valve, so that solid materials can be supplemented in time and supply can be cut off conveniently. The upper part of the powder silo can be provided with a dust removal device and a pressure protection device to prevent the dust pollution and the harm caused by overhigh air pressure in the silo. The discharge port of the storage bin is provided with a metering device, and the supply of various solid materials is controlled by a metering sensor and an automatically controlled butterfly valve. In order to realize continuous production, the materials in different bins can be supplied into the mixer for premixing according to the mixing ratio during the stirring of the previous pot, and of course, each solid material can also be supplied separately and sequentially. A solid material sealing valve 19 is connected below the mixer, the supply amount of each solid material can be accurately controlled by a metering sensor and a program set by a control system, and a vacuum state can be formed in the mixing drum by sealing a solid material supply channel.

The liquid supply unit in this embodiment mainly comprises a liquid supply device 20, a liquid control valve 21, a liquid storage tank 22, a liquid sealing valve 23, a liquid spray head 24, and a liquid delivery pipe. The liquid material supply equipment comprises a raw material tank, a fluid pump, a pressure regulating valve, an electromagnetic valve, a flow meter and the like. The raw material tanks are more than one, liquid raw materials comprising water and various liquid admixtures can be stored, metered and supplied, the various liquid raw materials can be conveyed to the mixer for premixing treatment through the control system according to the mixing proportion requirement, then the liquid raw materials are stored in the liquid storage tank for later use, and then the liquid raw materials are conveyed to the spray head 24 for use under the control of the liquid material sealing valve 23. 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 mixing the mixture, the shower nozzle not only makes solid material more even abundant with water contact when mixing the material with the mode of spraying, has improved the stirring quality and the efficiency of mixture, when unloading the completion back, washes the churn with the running water with the splash mode, has also improved the efficiency of washing the churn.

The discharging assembly in the embodiment comprises a discharging door, a lock pin, a first driving part and a second driving part, wherein a rotating shaft support is arranged at the bottom of the stirring cylinder body on one side of the discharging opening, a discharging door rotating shaft is arranged on the rotating shaft support through a bearing, and the discharging door is arranged on the discharging door rotating shaft; the lock pin is arranged at the lower part of the discharge door in a sliding manner, the bottom of the stirring barrel is provided with a discharge door stop block, and a stop block groove corresponding to one end part of the lock pin is formed in the discharge door stop block; the first driving part drives the discharging door to rotate; the second driving part drives the lock pin to slide left and right.

The first driving part comprises a discharge door control motor and a ratchet wheel group, the discharge door control motor is arranged at the bottom of the stirring barrel body, and the discharge door control motor is in transmission connection with a discharge door rotating shaft; the discharge door is connected with the discharge door rotating shaft through a ratchet wheel group.

The second driving part comprises outer teeth of a rotating shaft of the discharge door, a lock pin limiting wheel and a first compression spring, the outer teeth of the rotating shaft of the discharge door are arranged in the middle of the rotating shaft of the discharge door, the outer teeth of the rotating shaft of the discharge door are a section concentric with the rotating shaft of the discharge door, and a lock pin toothed belt matched with the outer teeth of the rotating shaft of the discharge door is arranged on the lock pin; the lock pin limiting wheel is arranged at the lower part of the lock pin and corresponds to the rotating shaft of the discharge door; the lower part of the discharge door is provided with two lock pin limiting blocks, the lock pin is arranged in the lock pin limiting blocks in a sliding manner, the first compression spring is sleeved on the lock pin between the two lock pin limiting blocks, a limiting convex ring is arranged at the end part of the lock pin close to the stop block of the discharge door, and the first compression spring is correspondingly attached to and limited by the limiting convex ring; the discharge port is conical, a sealing frustum matched with the discharge port is arranged on the upper side of the discharge door, an annular sealing groove is formed in the sealing frustum, and sealing filler or a sealing ring is arranged in the annular sealing groove; an arc driving surface is arranged on the lower portion of the discharging door stop block, an arc leading-in surface corresponding to the arc driving portion is arranged on the upper portion of the end portion of the lock pin, and a second compression spring is arranged between the end portion of the discharging door close to the discharging door rotating shaft and the stirring cylinder body.

The specific structure of the discharging assembly is explained in detail as follows: the center of the bottom of the stirring cylinder in the embodiment is provided with a discharging door 31 and a discharging component 17. The circumference of discharge door outside-in is the toper, and its level to radian is unanimous with the churn, and the churn discharge gate is size and configuration all around unanimous with the discharge door, for guaranteeing better leakproofness, the circumference of discharge door sets up the recess, establishes discharge door sealing washer 48 in. The periphery of the discharge port which faces downwards is provided with a convex water dripping edge with a flow guiding function. The discharging component 17 comprises a second compression spring 40, a discharging component support 41, a ratchet group 42, a discharging door rotating shaft 43, a discharging door rotating shaft external tooth 44, a lock pin toothed belt 45, a lock pin limiting wheel 46, a lock pin 47, a discharging door stop 50, a discharging door stop groove 51, a lock pin head 52, a lock pin limiting block 53, a first compression spring 54, a discharging door control motor support 57, a discharging door control motor 58, a discharging door rotating shaft bearing 59, a discharging door rotating shaft support 60 and a lock pin limiting wheel support 61. A discharge door rotating shaft support 60 (fig. 4 and 5) is respectively arranged at the front and the back of the left side (fig. 1 and 3) of the discharge port, a discharge door rotating shaft bearing 59 is correspondingly arranged in each discharge door rotating shaft support, a support 57 (fig. 5) for fixing a discharge door control motor 58 is arranged at the outer back of each discharge door rotating shaft support, and a discharge door rotating shaft 43 connected with a discharge door control motor spindle penetrates into the front and the back two discharge door rotating shaft bearings 59 respectively. The left side (figure 3) of discharge door sets up the discharge door pivot that can lay ratchet group 42, sets up two ratchet (figure 5) around in the pivot, and the inner ring of ratchet passes and is fixed in on the discharge door pivot, when discharge door control motor 58 anticlockwise (figure 3) drives discharge door pivot 43 and rotates, accessible ratchet group 42 drives discharge door 31 anticlockwise upset, makes the discharge gate seal, can not drive the discharge door at any time and open and the upset when nevertheless ratchet group clockwise turning. Set up a square opening in the middle of the discharge door pivot, set up discharge door pivot external tooth 44 in the discharge door pivot of corresponding position, the external tooth is only arranged locally to the circumference of discharge door pivot, otherwise can influence the opening and shutting of discharge door. Two sides (figures 3 and 5) of the opening of the rotating shaft hole of the discharge door are respectively provided with a lock pin limiting wheel bracket 61 which can fix the axle of the lock pin limiting wheel 46 downwards. The left and right directions of the center of the bottom of the discharging door are respectively provided with a lock pin limiting block 53 (figure 3), the corresponding positions of the left and right lock pin limiting blocks are provided with a slide way hole through which a lock pin 47 can conveniently pass, the cross section of the lock pin is square, the end part of the lock pin limiting block passing through the right side is provided with a lock pin head 52, and the upper right end of the lock pin head is of an arc structure. The right side of the discharge hole corresponding to the lock pin head is provided with a discharge door stop 50, the corresponding position of the discharge door stop and the lock pin head 52 is provided with a discharge door stop groove 51, the head of the lower end of the discharge door stop is provided with an arc structure towards one side of the lock pin head, and the lock pin head can slide into the discharge door stop groove conveniently. The periphery of the lock pin rod between the left lock pin limiting block and the right lock pin limiting block is sleeved with a first compression spring 54, the left end of the first compression spring tightly props against the left lock pin limiting block, the right end of the first compression spring tightly props against a limiting convex ring on the lock pin rod, and the first compression spring is always in a compression state. During the lockpin left end stretched into the gap between discharge door pivot external tooth 44 and the spacing wheel 46 of lockpin, lockpin left side up end corresponded with discharge door pivot external tooth and set up lockpin cingulum 45, when discharge door pivot drive discharge door pivot external tooth clockwise rotation to a certain extent, external tooth and lockpin cingulum contacted, continued clockwise rotation can make the lockpin produce the translation left with the help of gear structure, the lockpin head is deviate from in the discharge door dog recess, the discharge door is opened. Be provided with second compression spring 40 between the left end of discharge door and the stirring barrel outer wall, second compression spring can accelerate the speed that the discharge door was opened, reduces and makes the ground paste spatter partially because of blockking of discharge door.

This application still is provided with control system, can guarantee that feed, water supply, evacuation etc. can be implemented accurately, ensure to mix out the Ultra High Performance Concrete (UHPC) mixture that satisfies the designing requirement.

Specifically, the control system includes a microcomputer 32 and a controller 33, 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 regulates and controls the actions (the motor rotating speed, the material flow, the vacuum degree and the like) of the functional components according to feedback signals.

The main frame mainly comprises a mixing drum bracket 30 and the like, the size and the form of the main frame can be determined according to the specific conditions of production scale, discharging mode and the like, and the main frame mainly provides support and protection for a mixing assembly, a raw material supply assembly, a control system and the like.

The method for using the forced 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 the devices of the solid material supply unit and the liquid material supply unit.

(2) And closing a discharge door and an air valve of the mixing drum, 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 control of the vacuum degree is realized through a control system.

(7) Starting the stirring assembly, stirring at a low speed, adding the liquid raw materials in a spraying mode by controlling while stirring, sequentially stirring at a medium speed and a high speed according to a set program after the feeding is finished, and maintaining the vacuum degree in the stirring cylinder to be constant by the vacuumizing assembly during the stirring.

(8) And after stirring, closing a vacuum valve of the vacuumizing assembly, and opening an air valve to recover the normal pressure in the stirring cylinder.

(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 a water supply device and a spray head of the liquid material supply unit to wash the mixing drum to be clean.

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

Change the utility model discloses a concrete specification, size, form etc. of component structures such as Ultra High Performance Concrete (UHPC) is with forcing formula vacuum mixer, stirring subassembly, solid material supply unit, liquid material supply unit, evacuation subassembly and control system, if make cylindric structure with the churn, left main shaft and right main shaft are even as an organic whole, add clear glass and survey the mouth on the churn wall, or make the churn by a specific material like transparent toughened glass, or arrange pressure sensor and position sensor further control the change of mix volume etc. in the churn, be the utility model discloses a common change differs a detailed description 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. The forced vacuum mixer for preparing 3D printed ultra-high performance concrete is characterized by comprising the following components in parts by weight:

the stirring cylinder is provided with a discharge hole at the bottom;

the stirring assembly is arranged in the stirring cylinder body, 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 discharging assembly is arranged at the discharging opening and used for sealing the discharging opening; and

and the control system is used for controlling each component.

2. A forced vacuum mixer for preparing 3D printed ultra high performance concrete according to claim 1, wherein the mixing assembly comprises:

the stirring shaft is connected with the stirring barrel through a bearing;

a stirring paddle arranged on the stirring shaft; and

and the stirring motor is arranged outside the stirring barrel body and is in transmission connection with the stirring shaft.

3. The forced vacuum mixer for preparing 3D printed ultra-high performance concrete according to claim 2, wherein the mixing shaft comprises a first main shaft and a second main shaft which are coaxially and horizontally arranged, a gear box is arranged in the mixing cylinder through a gear box support rod in a connecting manner, the first main shaft and the second main shaft are connected with the mixing cylinder and the gear box through bearings, and the gear box and the mixing cylinder are fixedly connected through the gear box support rod; a driving gear and a driven gear are respectively arranged on the first main shaft and the second main shaft, and a reversing gear which is matched and meshed with the driving gear and the driven gear is arranged in the gear box;

the first main shaft and the second main shaft are both provided with at least one group of stirring blades, the number of each group of stirring blades is at least two, and each stirring blade comprises a blade support rod and a material stirring plate;

the sealing unit is a sealing cover arranged on the stirring cylinder body outside the stirring motor, and each bearing is a sealing bearing.

4. A forced vacuum mixer for preparing 3D printed 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 forced vacuum mixer for preparing 3D printed 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 arranged on a branch pipeline between the evacuation pipe and the dust suction unit; the vacuum pumping pipe is also connected with a vacuum degree instrument and an air valve through branch pipelines, and an exhaust silencing valve is arranged at the air outlet end of the vacuum pump.

6. The forced vacuum mixer for preparing 3D printed ultra-high performance concrete according to claim 1, wherein the feeding assembly comprises a solid material supply unit and a liquid material supply unit, the solid material supply unit comprises a solid material conveying pipeline, a solid material sealing valve arranged on the solid material conveying pipeline, and a solid material feeding device 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.

7. The forced vacuum mixer for preparing 3D printed ultra-high performance concrete according to claim 6, wherein the solid material supply equipment comprises bins, conveyors, metering equipment, solid material storage tanks and solid material control valves, and a plurality of the bins are communicated with the solid material storage tanks through the corresponding conveyors and metering equipment; 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. A forced vacuum mixer for preparing 3D printed ultra high performance concrete according to claim 1, wherein the discharging assembly comprises:

the bottom of the stirring barrel body on one side of the discharge port is provided with a rotating shaft support, a discharge door rotating shaft is arranged on the rotating shaft support through a bearing, and the discharge door is arranged on the discharge door rotating shaft;

the stirring cylinder body is provided with a stirring cylinder body, a locking pin is arranged at the lower part of the discharging door in a sliding manner, a discharging door stop block is arranged at the bottom of the stirring cylinder body, and a stop block groove corresponding to one end part of the locking pin is formed in the discharging door stop block;

a first driving part for driving the discharge door to rotate; and

and a second driving part for driving the lock pin to slide left and right.

9. The forced vacuum mixer for preparing 3D printed ultra-high performance concrete according to claim 8, wherein the first driving part comprises:

the discharge door control motor is arranged at the bottom of the stirring barrel and is in transmission connection with the discharge door rotating shaft; and

the discharge door is connected with the discharge door rotating shaft through a ratchet wheel set;

the second driving part includes:

the outer teeth of the discharging door rotating shaft are arranged in the middle of the discharging door rotating shaft, the outer teeth of the discharging door rotating shaft are a section which is concentric with the discharging door rotating shaft, and a lock pin toothed belt matched with the outer teeth of the discharging door rotating shaft is arranged on the lock pin;

the lock pin limiting wheel is arranged at the lower part of the lock pin and corresponds to the rotating shaft of the discharging door; and

the lower part of the discharge door is provided with two lock pin limiting blocks, the lock pins are arranged in the lock pin limiting blocks in a sliding manner, the first compression spring is sleeved on the lock pins between the two lock pin limiting blocks, the end parts of the lock pins close to the discharge door limiting blocks are provided with limiting convex rings, and the first compression spring and the limiting convex rings are correspondingly attached for limiting;

the discharge hole is conical, a sealing frustum matched with the discharge hole is arranged on the upper side of the discharge door, an annular sealing groove is formed in the sealing frustum, and sealing filler or a sealing ring is arranged in the annular sealing groove; the lower part of the discharge door stop block is provided with an arc-shaped driving surface, and the upper part of the end part of the lock pin is provided with an arc-shaped leading-in surface corresponding to the arc-shaped driving part;

and a second compression spring is arranged between the end part of the discharge door close to the discharge door rotating shaft and the stirring cylinder body.

10. A forced vacuum mixer for preparing 3D printed ultra high performance concrete according to claim 1, wherein the control system comprises:

a microcomputer;

a controller; and

the system comprises a stirring assembly, a solid material supply unit, a liquid material supply unit and a vacuumizing assembly, wherein the stirring assembly is used for stirring the liquid material, the solid material supply unit is used for supplying the liquid material, the vacuumizing assembly is used for vacuumizing the liquid material, the stirring assembly is used for stirring the liquid material, the solid material supply unit is used for vacuumizing the liquid material, the liquid material supply unit is used for vacuumizing the liquid material, the vacuumizing assembly is used for vacuumizing the liquid material, the sensors are used for respectively transmitting acquired analog signals to a controller through cables, the controller is used for recording and storing data after digital-to-analog signal conversion, the data are displayed in real time through a display of a microcomputer, and meanwhile, the control system is used for regulating and controlling the functions of the assemblies according to feedback signals.

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