CN214981794U

CN214981794U - 3D prints ultra-high performance feeding system for concrete

Info

Publication number: CN214981794U
Application number: CN202120492136.4U
Authority: CN
Inventors: 汤寄予; 高丹盈; 郭亚江; 庞育阳; 杨林; 房栋; 程站起; 吕铭艳
Original assignee: Zhengzhou University
Current assignee: Zhengzhou University
Priority date: 2021-03-09
Filing date: 2021-03-09
Publication date: 2021-12-03
Anticipated expiration: 2031-03-09

Abstract

The utility model belongs to the technical field of 3D prints ultra high performance concrete. A feeding system for 3D printing of ultrahigh-performance concrete comprises a stirring tank, a vacuumizing unit, a main stirring unit, a feeding unit, a conveying pump and a 3D printer nozzle, wherein the stirring tank is of a sealing structure and is supported by a main body rack; the vacuumizing unit is connected with the top of the stirring tank and is used for vacuumizing the stirring tank; the main stirring unit is used for stirring the materials in the stirring tank; the feeding unit is arranged at the top of the stirring tank and used for feeding materials into the stirring tank; the feed end of the conveying pump is connected with the bottom of the stirring tank through a material receiving pipe; the discharge end of delivery pump with 3D print head is connected. This application structural design is reasonable, the environmental protection is high-efficient, intelligent and the greenization degree is high, and more is suitable for Ultra High Performance Concrete (UHPC) 3D to print.

Description

3D prints ultra-high performance feeding system for concrete

Technical Field

The utility model belongs to the technical field of 3D prints ultra high performance concrete, especially relate to a 3D prints feeding system for ultra high performance concrete.

Background

With the rise of the fourth industrial revolution taking artificial intelligence, new material technology, virtual reality and the like as technical breakthrough, intellectualization and greenization become targets for pursuing and developing modern industry, and the characteristics of improving the utilization rate of resources and energy, reducing pollution emission, changing life style, being flexible and easy to change and the like are substantial characteristics. However, in the building industry, the 3D printing concrete technology which is expected to be developed in compliance with the fourth industrial revolution is not mature, and no matter the 3D printing concrete material or complete equipment which can meet the requirements of intelligent and green printing construction is available. 3D printing has higher requirements on the performance of concrete, the traditional concrete is difficult to adapt, and the design and construction of the 3D printed concrete cannot be well guided by the existing theory. For example, 3D printed concrete must have excellent thixotropy, ensure sufficient rheological properties for smooth extrusion from a nozzle during printing, be rapidly solidified and hardened in air after printing, have sufficient volume stability and appropriate early strength to 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 back printing layers should have good interface bonding performance and high reference strength to avoid strength attenuation caused by interface transition layers. This makes Ultra High Performance Concrete (UHPC) with higher benchmark strength and excellent durability an ideal choice for 3D printed concrete, however, UHPC adds high-activity micropowder such as silica fume and the like to obtain a compact microstructure, adopts a lower water-to-gel ratio to improve strength, removes coarse aggregate to improve homogeneity, especially, a plurality of additives such as thickening agent, water reducing agent and the like are added for improving rheological property, the total amount of the cementing material and the total amount of the additives are far higher than that of the conventional concrete, so that the mixture is more viscous and has poorer pumpability, the existing 3D printing concrete mixture supply system comprises the links of raw material storage, classification, feeding, mixing and conveying, has low intelligent and green degree, is difficult to meet the supply demand of the ultra-high performance concrete mixture, therefore, there is a need to develop a mix supply system that meets the requirements for 3D printing of ultra high performance concrete.

Disclosure of Invention

The utility model discloses the purpose is to the problem that the aforesaid exists and not enough, provides a 3D prints feed system for ultra high performance concrete, and its structural design is reasonable, the environmental protection is high-efficient, intelligent and the greening degree is high and more be suitable for Ultra High Performance Concrete (UHPC) 3D to print.

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

A3D prints feed system for ultra-high performance concrete, includes:

the stirring tank is of a sealing structure and is supported by the main body frame;

the vacuumizing unit is connected with the top of the stirring tank and is used for vacuumizing the stirring tank;

the main stirring unit is used for stirring the materials in the stirring tank;

the feeding unit is arranged at the top of the stirring tank and is used for feeding materials into the stirring tank;

the feeding end of the conveying pump is connected with the bottom of the stirring tank through a material receiving pipe; and

3D print head, the discharge end of delivery pump with 3D print head connects.

According to the utility model discloses 3D prints feed system for ultra high performance concrete, preferably, the delivery pump includes:

a pump body;

the rotary support of the disc valve is arranged in the pump body, the upper part of the disc valve is provided with a material receiving port, the circumferential direction of the disc valve is provided with a material sucking port, a first reversing port and a second reversing port at intervals of 120 degrees, the material sucking port is communicated with the material receiving port through a material sucking pipe, and the first reversing port is communicated with the second reversing port through a reversing pipe;

a rotation driving unit for driving the disc valve to rotate;

the first cylinder body and the second cylinder body are arranged in the pump body side by side, a material conveying pipe is arranged on the pump body, and the material conveying pipe, the first cylinder body and the second cylinder body respectively correspond to the first reversing port, the second reversing port and the material suction port;

pump cylinder pistons, which are arranged in the first cylinder body and the second cylinder body; and

a pumping drive unit for driving the pump cylinder piston to move in the first cylinder and the second cylinder;

an arc-shaped groove with an included angle of 120 degrees is formed in the disc valve, the arc-shaped groove and the disc valve are concentrically arranged, and a damping limiting pin corresponding to the arc-shaped groove is arranged on the pump body; the material receiving opening is connected with a material receiving pipe, and a sealing bearing is arranged between the material receiving pipe and the material receiving opening.

According to the utility model discloses feeding system for 3D printing ultra high performance concrete, preferably, the pump sending drive division includes power shell, pump sending driving motor and two sets of crank link units, the drive end of two sets of crank link units all with pump sending driving motor connects, the pump cylinder piston in first cylinder body and the second cylinder body all is connected with the action end of corresponding crank link unit through the piston rod; the crank link unit includes:

the crank is fixedly connected with an output shaft of the pumping driving motor;

a dowel bar, wherein the first end of the dowel bar is hinged with the crank;

the connecting rod and the swing rod are hinged with the second end part of the dowel bar, and the connecting rod is hinged with the piston rod; and

and the swing rod positioning frame is fixedly arranged on the power shell, and the swing rod is hinged with the swing rod positioning frame.

According to the utility model discloses 3D prints ultra high performance concrete and uses feeding system, preferably, the external diameter of first cylinder body and second cylinder body is the same with the external diameter of inhaling the material pipe, the external diameter of first cylinder body and second cylinder body is greater than the external diameter of switching-over pipe; the front ends of the first cylinder body and the second cylinder body are both provided with arc segment elbows, the front part of the pump cylinder piston is provided with a material pushing plate connecting rod and a material pushing plate, the material pushing plate connecting rod is hinged with the material pushing plate, the front end of the material pushing plate is an arc surface matched with the circumferential direction of the disc valve, the side wall of the material pushing plate is provided with an arc side wall matched with the arc segment elbows, a linear bearing sliding hole is formed in the pump cylinder piston, the rear end of the material pushing plate connecting rod is T-shaped, and the rear end of the material pushing plate connecting rod is matched and arranged in the linear bearing sliding hole;

the rear end of the piston rod is connected with the crank connecting rod unit through a guide sliding rod and a guide cylinder, and a linear bearing is arranged between the guide sliding rod and the guide cylinder; a damping limiting ring is arranged between the guide cylinder body and the corresponding first cylinder body or second cylinder body, the piston rod is arranged in the damping limiting ring in a sliding and penetrating mode, and the damping limiting ring is used for limiting and buffering the guide slide rod.

According to the utility model discloses feeding system for 3D printing ultra high performance concrete preferably, still includes lubrication unit and temperature control unit, lubrication unit includes lubricating oil storage tank and many lubricating oil pipes, is provided with the solenoid valve on the lubricating oil pipe; the temperature control unit comprises a compressor, a condenser, a pump body cooler, a power cooler, a temperature sensor and a controller.

According to the utility model discloses 3D prints feed system for ultra high performance concrete, preferably, 3D print head includes:

the upper part of the nozzle charging barrel is provided with a nozzle feeding pipe and a mechanical arm;

the nozzle is arranged at the bottom of the spray head charging barrel, and a discharging cavity of the nozzle is rectangular;

the nozzle stirring unit is arranged in the nozzle charging barrel and is used for continuously stirring materials in the nozzle charging barrel;

the thick liquid strip thickness adjusting unit is arranged in the nozzle and is used for adjusting the thickness of the thick liquid strips sprayed out by the nozzle; and

and the width adjusting unit is arranged at the lower part of the nozzle and is used for adjusting the width of the pulp strips sprayed out by the nozzle.

The thick liquid strip thickness adjusting unit comprises a valve plate and a valve plate driving part, and the upper part of the valve plate is hinged to one side wall of the discharging cavity of the nozzle; the valve plate driving part drives the valve plate to rotate, and two side walls of the valve plate are in sliding fit with the side walls of the discharging cavity;

the width adjusting unit comprises a width adjusting substrate, a troweling plate and a width driving part, and the width adjusting substrate is arranged on the outer side wall of the nozzle; the two troweling plates are oppositely arranged at the lower parts of the nozzles from left to right; the width driving part is arranged between the width adjusting substrate and the troweling plates and adjusts the distance between the two troweling plates;

the lifting adjusting unit drives the pulp strip width adjusting unit to do lifting motion relative to the nozzle; the lifting adjusting unit comprises a lifting seat and a lifting driving part, the lifting seat is fixedly arranged on the side wall of the nozzle, and the width adjusting substrate is arranged on the lifting seat in a sliding manner; the lifting driving part drives the width adjusting substrate to lift;

the width driving part comprises an adjusting screw, a nut and a sliding driving motor, and the adjusting screw is arranged on the width adjusting substrate; the troweling plate is arranged on the adjusting screw through a nut, and the upper end of the troweling plate is attached to the width adjusting substrate in a sliding mode or is in matched sliding connection through a transverse sliding rail; the sliding driving motor drives the adjusting screw rod to rotate;

the sprayer charging barrel is U-shaped and is integrally sealed, and a plurality of detection sensors are arranged on the side wall of the sprayer charging barrel; the nozzle stirring unit comprises a nozzle stirring motor, a nozzle stirring shaft and a nozzle stirring blade, and the nozzle stirring motor is arranged at the top of the nozzle charging barrel; the spray head stirring shaft is connected and arranged at the top of the spray head charging barrel through a sealing bearing, and the spray head stirring motor is in transmission connection with the spray head stirring shaft; the nozzle stirring blade is arranged on the nozzle stirring shaft.

According to the utility model discloses feeding system for 3D printing ultra high performance concrete, preferably, two troweling plates are respectively provided with a width adjusting base plate and a width driving part correspondingly, and the two troweling plates respectively act independently; the single troweling plate comprises a first troweling plate, a curing agent spraying roller and a second troweling plate which are fixedly arranged in sequence, the first troweling plate and the second troweling plate respectively comprise a zigzag troweling surface, and the width between the two first troweling plates is wider than the width between the two second troweling plates;

the curing agent spray roller comprises:

the upper part of the inner pipe is fixed with the first troweling plate and the second troweling plate, the inner pipe is connected with a curing agent feeding pipe, and an orifice with an opening facing the grout strip is formed in the inner pipe; and

the lantern ring, its cover is established on the inner tube, and can the free rotation action, the lantern ring with form the clearance layer between the inner tube, the equipartition has been seted up on the lantern ring paints the hole the outside of curing agent spray roller is provided with the protection casing.

According to the utility model discloses feeding system for 3D printing ultra high performance concrete, preferably, be provided with the material conveying machine between delivery pump and the 3D print head, the material conveying machine includes conveying pipeline, conveying spiral and conveying driving motor; the material conveying pipe is a straight pipe or/and a flexible bent pipe, a rigid material conveying spiral is distributed in the straight pipe, and a flexible material conveying spiral is arranged in the flexible bent pipe;

work as the conveying pipeline is flexible return bend, or when the conveying pipeline forms for straight tube and flexible return bend concatenation, still be provided with the pressure boost unit, the pressure boost unit includes:

the device comprises a pressurizing shell, a connecting flange and a connecting flange, wherein the connecting flange is arranged at two ends of the pressurizing shell;

the gearbox is arranged on the side part of the supercharging shell, and a plurality of transmission gears which are meshed in a matching mode are distributed in the gearbox;

the force transmission shaft is arranged in the supercharging shell, two ends of the force transmission shaft are connected with the corresponding rigid material conveying screws or flexible material conveying screws in a key mode, an assembly cavity is formed in the supercharging shell, the assembled force transmission shaft is arranged in the assembly cavity through a force transmission bearing, and a force transmission gear meshed with a transmission gear at the output end of the gear box is arranged on the force transmission shaft; and

and the boosting motor is arranged on the gear box and meshed with a transmission gear at the input end of the gear box.

According to the utility model discloses 3D prints feed system for ultra high performance concrete, preferably, main stirring unit includes:

the first rotating shaft and the second rotating shaft are horizontally arranged in the stirring tank;

the fixing rods are vertically arranged in the stirring tank;

the gear box is fixedly connected with the fixed rod, the first rotating shaft and the second rotating shaft are both connected with the gear box through bearings, and a first bevel gear and a second bevel gear are respectively arranged at the end parts of the first rotating shaft and the second rotating shaft;

the third bevel gear is arranged in the gear box through a bearing, and the first bevel gear and the second bevel gear are matched and meshed with the third bevel gear;

a main stirring driving part which drives the first rotating shaft or the second rotating shaft to move; and

and the first rotating shaft and the second rotating shaft are fixedly provided with stirring blades.

According to the utility model discloses feeding system for 3D printing ultra high performance concrete, preferably, agitator tank bottom is the U type, agitator paddle blade tip is provided with the material turning plate, be provided with sweepback angle and side dip angle on the material turning plate, at least part the material turning plate with the bottom laminating of agitator tank;

the first rotating shaft and the second rotating shaft are both connected with the stirring tank through bearings, and sealing covers corresponding to the first rotating shaft and the second rotating shaft are arranged on the stirring tank;

the vacuumizing unit comprises a gas collecting hood, an air exhaust pipeline, a vacuumizing pump and a silencer which are sequentially arranged, a three-way pipe, a reversing valve and a vacuumizing valve are sequentially arranged on the air exhaust pipeline between the gas collecting hood and the vacuumizing pump, a third port of the three-way pipe is connected with an air valve, a third port of the reversing valve is connected with a dust removal device, and a vacuum meter is further arranged on the air exhaust pipeline between the reversing valve and the vacuumizing pump;

the top of the stirring tank is also provided with a pressurizing pipe, and the pressurizing pipe is sequentially provided with a barometer, a pressure control valve, an air compressor and an air inlet valve;

the feeding unit comprises solid material feeding equipment and liquid material feeding equipment.

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

(1) the application discloses adopt vacuum mixer to mix the mix in the feed system of ultra high performance concrete 3D printer, can furthest improve ultra high performance concrete's homogeneity, compactness, intensity and durability, guarantee the long-term service performance of hardened concrete.

(2) This application can guarantee the even non-delayed supply and the extrusion of concrete thick liquids through reasonable design's printing shower nozzle, realize printing in succession, the cross-section is printed out to the nozzle can guarantee good interlaminar bonding strength for the ground paste strip of rectangle, can also improve homogeneity, the surface finishing function that the shower nozzle has can make the finished product show more pleasing to the eye external profile, curing agent spraying function can effectively prevent scattering and disappearing of surface moisture, make inside and outside water-to-glue ratio unanimous, prevent the surface shrinkage crack, reduce the interlaminar performance difference of sclerosis concrete to the at utmost.

(3) The utility model provides a defeated material machine's setting can guarantee the stability and the continuity of feed, and then guarantees UHPC's printing quality.

(4) Further, this application can offset defeated material in-process because of the flexible return bend with flexible defeated material spiral and the torsion that the flexible pivot brought, the atress at balanced flexible pivot both ends, the propelling movement pressure of UHPC mixture in the stable flexible defeated material pipe improves transport efficiency to the torsion that the flexible pivot was brought to the frictional resistance between flexible pivot, the steady flexible defeated material pipe through setting up of booster in the defeated material machine.

(5) The setting of flexible return bend in this application conveying machine can make the printer have better environmental suitability, is convenient for print the shower nozzle nimble operation in the space.

(6) The disc valve in the concrete pump replaces a gate valve or an S-shaped pipe valve, and the defects that the gate valve is low in pumping height of concrete mixture, conveying pressure is insufficient, power consumption is large, service life is short and the like due to abnormal swinging when the S-shaped pipe valve pumps ultrahigh-performance concrete can be overcome. The arrangement of a dowel bar and a swing bar in the power system avoids the interruption or unsmooth conveying caused by dead points.

(7) The control system can enable the vacuum mixer to prepare the ultra-high performance concrete mixture meeting the design requirements, enable the concrete pump to be in the best working state and high efficiency all the time, is high in energy utilization rate and long in service life, is accurate in material conveying amount control, and is particularly suitable for conveying the 3D printed ultra-high performance concrete mixture meeting the intelligent construction requirements.

(8) This application can intelligently control each link of throwing the material, mixing and carrying through controlling means, can realize continuous feed, mix promptly, stably carry, and the reduction raw and other materials of maximum are extravagant.

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 according to the utility model discloses a 3D prints super high performance concrete and uses feeding system's schematic structure.

Fig. 2 is a schematic structural diagram of a delivery pump according to an embodiment of the present invention.

Fig. 3 is a schematic view of the structure in the direction of a-a in fig. 2.

Fig. 4 is according to the utility model discloses 3D print head's structural schematic.

Fig. 5 is a side view of the structure of fig. 4.

Fig. 6 is a schematic view of the structure in the direction B-B in fig. 4.

Fig. 7 is a schematic structural diagram of a 3D printer nozzle operating condition according to the embodiment of the present invention.

Fig. 8 is a schematic structural diagram of a pressurizing unit according to an embodiment of the present invention.

Fig. 9 is a schematic view of the structure in the direction of C-C in fig. 8.

Number in the figure:

100 is a stirring tank, 101 is a first rotating shaft, 102 is a second rotating shaft, 103 is a fixed rod, 104 is a gear box, 105 is a first bevel gear, 106 is a second bevel gear, 107 is a third bevel gear, 108 is a main stirring driving part, 109 is a sealing cover, 110 is a stirring blade, 111 is a material turning plate, 112 is a gas collecting cover, 113 is an air exhaust pipeline, 114 is a vacuum pump, 115 is a silencer, 116 is a three-way pipe, 117 is a reversing valve, 118 is a vacuum pumping valve, 119 is an air valve, 120 is a dust removing device, 121 is a vacuum gauge, 122 is a pressure pipe, 123 is an air pressure gauge, 124 is a pressure control valve, 125 is an air compressor, 126 is an air inlet valve, 127 is a solid material supply device, and 128 is a liquid material supply device;

210 is a nozzle charging barrel, 211 is a mechanical arm, 212 is a nozzle feeding pipe, 213 is a nozzle stirring motor, 214 is a nozzle stirring shaft, 215 is a nozzle stirring blade, and 216 is a connecting plate;

220 is a nozzle, 221 is a valve plate, 222 is a valve plate driving part, and 223 is a valve plate rotating shaft;

231 is a width adjusting substrate, 2321 is a first troweling plate, 2322 is a curing agent spraying roller, 2323 is a second troweling plate, 2324 is an inner tube, 2325 is a collar, 2326 is a gap layer, 2327 is a spray hole, 2328 is a coating hole, 233 is an adjusting screw, 234 is a sliding driving motor, 235 is a lifting seat, 236 is a lifting driving part, 237 is a lifting screw, 238 is a lifting slide rail, and 239 is a transverse slide rail;

240 is a detection sensor;

310 is a pump body, 311 is a material receiving pipe, 312 is a sealing bearing, 313 is a material conveying pipe;

320 is a disc valve, 321 is a material receiving port, 322 is a first reversing port, 323 is a second reversing port, 324 is a material sucking port, 325 is a material sucking pipe, 326 is a reversing pipe, 327 is a rotary driving part, 328 is an arc-shaped groove, and 329 is a damping limit pin;

330 is a first cylinder body, 331 is a pump cylinder piston, 332 is an arc segment elbow, 333 is a pushing plate connecting rod, 334 is a pushing plate, 335 is a linear bearing slide hole, 336 is a guide slide rod, 337 is a guide cylinder body, 338 is a linear bearing, 339 is a damping limit ring;

340 is a second cylinder body, 341 is a crank, 342 is a dowel bar, 343 is a swing rod positioning frame, 344 is a connecting rod, 345 is a swing rod, 346 is a piston rod, 347 is a crank positioning shaft, 348 is a motor bracket and 349 is a swing rod positioning shaft;

350 is a lubricating oil storage tank, 351 is a lubricating oil pipe and 352 is an electromagnetic valve;

360 is a compressor, 361 is a pump body cooler, 362 is a power cooler, 363 is a temperature sensor;

370 is a power shell, 371 is a pumping driving motor, 372 is a pressure sensor;

401 is a straight pipe, 402 is a flexible bent pipe, 403 is a rigid material conveying screw, 404 is a flexible material conveying screw, 405 is a material conveying driving motor, 406 is a pressurizing shell, 407 is a gear box, 408 is a force transmission shaft, 409 is a pressurizing motor, 410 is a connecting flange, 411 is a transmission gear, 412 is a force transmission gear, 413 is a coupler, 414 is a material conveying screw rotating shaft, 415 is a sealing ring, and 416 is a fastening bolt.

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 to 9, a feeding system for 3D printing of ultra-high performance concrete comprises a stirring tank 100, a vacuumizing unit, a main stirring unit, a feeding unit, a delivery pump and a 3D printer nozzle, wherein the stirring tank 100 is in a sealed structure, and the stirring tank 100 is supported by a main frame; the vacuumizing unit is connected with the top of the stirring tank 100 and is used for vacuumizing the stirring tank; the main stirring unit is used for stirring the materials in the stirring tank; the feeding unit is arranged at the top of the stirring tank and used for feeding materials into the stirring tank; the feeding end of the conveying pump is connected with the bottom of the stirring tank through a material receiving pipe 311; the discharge end of delivery pump with 3D print head is connected.

The main stirring unit comprises a first rotating shaft 101, a second rotating shaft 102, a fixing rod 103, a gear box 104, a third bevel gear 107, a main stirring driving part 108 and a stirring blade 110 which are horizontally arranged in the stirring tank, and the fixing rod 103 is vertically arranged in the stirring tank 100; a gear box 104 is fixedly connected with the fixing rod 103, the first rotating shaft 101 and the second rotating shaft 102 are both connected with the gear box 104 through bearings, and a first bevel gear 105 and a second bevel gear 106 are respectively arranged at the end parts of the first rotating shaft 101 and the second rotating shaft 102; a third bevel gear 107 is arranged in the gear box through a bearing, and the first bevel gear 105 and the second bevel gear 106 are both in matched meshing with the third bevel gear; the main stirring driving part 108 drives the first rotating shaft 101 or the second rotating shaft 102 to move; the first rotating shaft 101 and the second rotating shaft 102 are both fixedly provided with stirring blades 110.

The bottom of the stirring tank 100 is U-shaped, the end part of the stirring paddle 110 is provided with a material turning plate 111, the material turning plate 111 is provided with a sweepback angle and a side inclination angle, and at least part of the material turning plate 111 is attached to the bottom of the stirring tank 100; the first rotating shaft 101 and the second rotating shaft 102 are connected with the stirring tank through bearings, and the stirring tank is provided with a sealing cover 109 corresponding to the first rotating shaft and the second rotating shaft.

Stirring paddle leaf sets up along first pivot and second pivot subtend, and stirring paddle leaf's size and length have greatly little to form the balanced stirring paddle leaf group of size, every stirring paddle leaf all sets up the stirring board that has sweepback angle and control inclination, in order to improve the one-way discharge ability of mixture, and form the multilayer circulation flow, the size of stirring board increases along with shortening of paddle branch, but the balanced shear resistance, make power consumption still less. The relative reverse rotation of the stirring paddle on the first rotating shaft and the stirring paddle on the second rotating shaft can enable the UHPC mixture to form convection circulation and turbulent diffusion, and higher stirring efficiency and 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, so that uneven stirring caused by bottom grabbing due to slurry adhesion is avoided.

The vacuumizing unit comprises a gas collecting hood 112, an air extracting pipeline 113, a vacuumizing pump 114 and a silencer 115 which are sequentially arranged, a three-way pipe 116, a reversing valve 117 and a vacuumizing valve 118 are sequentially arranged on the air extracting pipeline between the gas collecting hood 112 and the vacuumizing pump 114, a third port of the three-way pipe is connected with an air valve 119, a third port of the reversing valve is connected with a dust removing device 120, and a vacuum meter 121 is further arranged on the air extracting pipeline between the reversing valve and the vacuumizing pump; the top of the stirring tank is also provided with a pressurizing pipe 122, and the pressurizing pipe is sequentially provided with a barometer 123, a pressure control valve 124, an air compressor 125 and an air inlet valve 126; the feed unit includes a solids feed 127 and a liquid feed 128.

Specifically, the gas collecting hood arranged in the stirring tank is respectively connected with the gas valve and the reversing valve through a three-way pipe. The air valve is a digital control type air valve, and when the air 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 device 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 a dust removal device through an airflow control valve, and the other path of the reversing valve is connected with a vacuum pumping pump through a vacuum valve. A vacuum meter with vacuum pressure sensing and digital display functions is connected between the vacuum valve and the reversing valve, and a valve or a silencer with exhaust silencing functions is arranged at an exhaust port of the vacuum pump. When the dust solid materials are put into the mixing drum, the air valve is closed, the reversing valve is connected with a pipeline connected with the dust removal device, part of dust flows to the dust removal device along with air flow, and before the powder is put into the mixing drum and vacuumized, the spray nozzle starts a spraying function to eliminate the influence of suspended fine dust on the vacuum pumping pump. The solid material supply device in the embodiment comprises a raw material conveyor, a storage bin, a mixer, metering equipment, a control valve and the like. Various raw materials are stored in the storage bins through the raw material conveyor, and the raw materials in different storage bins are conveyed into the mixer through the metering device and the control valve respectively according to the requirement of the mixing proportion of the ultra-high performance concrete mixture for premixing so as to realize continuous production, and meanwhile, each solid material can also be independently and sequentially fed into the mixer. The solid material sealing valve and the metering sensor are connected below the mixer, the supply amount of the solid material can be accurately controlled by means of programs set by the metering sensor and the control system, a vacuum state can be formed in the mixing drum by sealing the solid material supply channel, and the mixture is subjected to vacuum mixing. The liquid material supply device mainly comprises a liquid material processing device, a liquid material control valve, a liquid material storage tank, a liquid material sealing valve, a liquid material spray head, a liquid conveying pipeline and the like. The liquid material treatment device comprises a raw material tank, a fluid pump, a pressure regulating valve, an electromagnetic valve, a flow meter and the like. The group number of the raw material tanks is set according to the requirement, the liquid raw materials comprising water and various liquid admixtures can be stored, metered and supplied, various liquid raw materials can be conveyed to the mixer for premixing treatment through the control system according to the mixing proportion requirement, and then are stored in the liquid storage tank for later use, and then are conveyed to the spray head for use through the control of the liquid material sealing valve, and simultaneously, different liquid raw materials can also be conveyed into the mixing drum in sequence to directly participate in the mixing of the mixtures. The liquid material control valve and the liquid material sealing valve are intelligent sensing and control devices comprising sensors such as a flowmeter and the like, and guarantee is provided for accurate control of supply amount of various liquid raw materials. The spray head is an intelligent control spray head and has functional modes of splashing, spraying, atomizing and the like. The top of the stirring tank is also provided with a pressure device consisting of a barometer, a pressure control valve, an air compressor and an air inlet valve. The pipeline that draws forth from the agitator tank passes through the three-way pipe and connects barometer and pressure control valve respectively, and pressure control valve connects the air compressor machine, and the air compressor machine front end is connected the admission valve. The control system of this application can accurate control pressure equipment through the pressure signal of pressure sensor feedback provide in the size of agitator tank air pressure, supplementary concrete pump and defeated material machine are carried ultra high performance concrete mixture for printing the shower nozzle, improve and print efficiency. The main machine frame is connected with a stirring tank of the vacuum stirrer, a disc valve of the concrete delivery pump, a power shell and the like, and is mainly used for supporting and protecting the vacuum stirrer, a raw material supply system, the concrete delivery pump, a control system and the like.

Specifically, the delivery pump in this embodiment includes a pump body 310, a disc valve 320, a rotation driving portion 327, a first cylinder 330 and a second cylinder 340 arranged in the pump body 310 side by side, a pump cylinder piston 331, and a pumping driving portion, the disc valve 320 is rotatably supported and arranged in the pump body 310, a material receiving port 321 is arranged at the upper portion of the disc valve 320, a material suction port 324, a first reversing port 322, and a second reversing port 323 are arranged at an interval of 120 ° in the circumferential direction of the disc valve 320, the material suction port 324 is communicated with the material receiving port 321 through a material suction pipe 325, and the first reversing port 322 is communicated with the second reversing port 323 through a reversing pipe 326; the rotation driving unit 327 drives the disc valve 320 to rotate, and in this embodiment, the rotation driving unit is a servo motor; the pump body 310 is provided with a material conveying pipe 313, and the material conveying pipe 313, the first cylinder 330 and the second cylinder 340 respectively correspond to the first reversing port 322, the second reversing port 323 and the material suction port 324; a pump cylinder piston 331 is provided in each of the first cylinder 330 and the second cylinder 340; the pumping driving part drives the pump cylinder piston to act in the first cylinder 330 and the second cylinder 340.

An arc-shaped groove 328 with an included angle of 120 degrees is formed in the disc valve 320, the arc-shaped groove 328 and the disc valve 320 are concentrically arranged, and a damping limit pin 329 corresponding to the arc-shaped groove 328 is arranged on the pump body 310; connect material receiving pipe 311 in the connection of material receiving port 321 department, material receiving pipe 311 with be provided with sealed bearing 312 between the material receiving port. The rotary driving part is a servo motor and can drive the disc valve to perform 120-degree swinging rotation around the axis, when one end position is reached, the reversing pipe is communicated with the second cylinder body at the rear side and the conveying pipe, so that concrete mixture sucked into the second cylinder body in the previous suction and discharge cycle is discharged into the conveying pipe through the reversing pipe, and meanwhile, the suction pipe is communicated with the first cylinder body, so that the first cylinder body sucks the concrete mixture; similarly, when the disc valve is driven by the servo motor to rotate by 120 degrees, the material suction pipe is communicated with the second cylinder body, so that concrete mixture is sucked into the rear side concrete cylinder, meanwhile, the first cylinder body is communicated with the material conveying pipe through the reversing pipe, so that the mixture in the first cylinder body can be discharged into the material conveying pipe, and the alternate rotation of the disc valve can complete a suction and discharge cycle on the concrete mixture.

In order to increase the efficiency of sucking and delivering concrete mixture, the outer diameters of the first cylinder 330 and the second cylinder 340 are the same as the outer diameter of the suction pipe 325, and the outer diameters of the first cylinder 330 and the second cylinder 340 are larger than the outer diameter of the reversing pipe 326. Further, in order to ensure that the materials in the first cylinder body and the second cylinder body are completely discharged and tightly matched in the material sucking and discharging process, and the material sucking and discharging efficiency is improved, the front ends of the first cylinder body 330 and the second cylinder body 340 of the present application are both provided with arc segment elbows 332 and correspondingly attached to the outer walls of the disc valves, the front part of the pump cylinder piston 331 is provided with a pushing plate connecting rod 333 and a pushing plate 334, the pushing plate connecting rod 333 is hinged with the pushing plate 334, the front end of the pushing plate 334 is an arc surface matched with the circumferential direction of the disc valves 320, the side wall of the pushing plate is provided with an arc side wall matched with the arc segment elbows, when discharging, the pushing plate can be attached to the outer walls of the disc valves, so that the materials in the first cylinder body and the second cylinder body are completely discharged, the pump cylinder piston 331 is internally provided with linear bearing slide holes 335, and the rear end of the pushing plate connecting rod 333 is in a T shape, the rear end of the ejector plate connecting rod 333 is arranged in the linear bearing sliding hole 335 in a matching way.

The material pushing plate is connected with the T-shaped material pushing plate connecting rod through a bearing, the material pushing plate can horizontally rotate at a certain angle around a shaft, the opening of the horizontal direction of the center of a piston of the pump cylinder faces to a linear bearing sliding hole of the disc valve, the T-shaped material pushing plate connecting rod can horizontally slide in the linear bearing sliding hole, the T-shaped material pushing plate connecting rod and the material pushing plate can adjust the horizontal position along with the cross section shape of the concrete cylinder, two contact surfaces can be tightly attached when the material pushing plate is close to the disc valve, and slurry leakage and incomplete mixture discharge are avoided.

The rear end of the piston rod 346 is connected with the crank link unit through a guide sliding rod 336 and a guide cylinder 337, and a linear bearing 338 is arranged between the guide sliding rod 336 and the guide cylinder 337. A damping limiting ring 339 is arranged between the guide cylinder 337 and the corresponding first cylinder 330 or second cylinder 340, the piston rod 346 is slidably inserted into the damping limiting ring 339, and the damping limiting ring 339 limits and buffers the guide slide rod 337. During operation, a piston rod connected with a pump cylinder piston penetrates through the damping limiting ring to be connected with a guide sliding rod, and the guide sliding rod is in contact with the linear bearing to form a sliding pair. The arrangement of the damping limiting ring can reduce the noise generated when the material pushing plate collides with the disk valve.

The pumping driving part comprises a power shell 370, a pumping driving motor 371 and two groups of crank connecting rod units, the driving ends of the two groups of crank connecting rod units are connected with the pumping driving motor, and the pump cylinder pistons 331 in the first cylinder 330 and the second cylinder 340 are connected with the action ends of the corresponding crank connecting rod units through piston rods 346. The crank connecting rod unit comprises a crank 341, a dowel bar 342 and a swing rod positioning frame 343, and the crank 341 is fixedly connected with an output shaft of the pumping driving motor 371; a first end of the dowel 342 is hinged with the crank 341; a connecting rod 344 and a swinging rod 345 which are hinged with the second end part of the dowel bar 342, wherein the connecting rod 344 is hinged with the piston rod 346; the swing link positioning rack 343 is fixedly arranged on the power housing 370, and the swing link 345 is hinged with the swing link positioning rack 343. Further, the crank 341 in this embodiment is U-shaped, a first rod of the crank 341 is fixed to the output shaft of the pumping driving motor 371, a second rod of the crank 341 is hinged to the power housing 370 through a crank positioning shaft 347, and the force transmission rod 342 is hinged to the middle of the crank 341.

In order to avoid the dead point phenomenon generated when a slide block in a crank connecting rod unit reaches a limit position, if a material pushing plate is contacted with a disc valve and a piston of a pump cylinder is contacted with a damping limiting ring at the same time, the load is overlarge due to collinear of three hinge pairs and the pumping operation is stopped due to drive failure, a force transmission rod and a swing rod are added in the crank connecting rod unit to form a crank connecting rod mechanism without the dead point, each crank connecting rod mechanism is driven by the same main pumping driving motor to form two independent and cooperatively operated crank connecting rod driving devices, a guide slide rod and a connecting rod in each crank connecting rod unit are connected through a bearing to form a hinge pair, the connecting rod, the force transmission rod and the swing rod are connected through a bearing to form a hinge pair, the force transmission rod and a crank are connected through a bearing to form a hinge pair, and the swing rod is connected with a swing rod positioning shaft through a bearing to form a swing pair. In order to ensure that the first cylinder body and the second cylinder body can synchronously suck and discharge concrete mixtures, two groups of cranks matched with the two cylinder bodies are symmetrically arranged on two sides of the pumping driving motor and are always coplanar by taking the common axle center of the pumping driving motor and the crank positioning shaft as a symmetry axis. The pumping driving motor is fixed on a motor support which is respectively connected with the power shell and the pump body, the swing rod positioning shaft is fixed on a swing rod positioning frame which is respectively connected with the power shell and the pump body, the other crank limb fixedly connected with the pumping driving motor is connected on the crank positioning shaft through a bearing, the crank positioning shaft is fixed on the power shell, and the power shell can be fixedly connected on a host support. When a crank fixedly connected with a rotating shaft of a pumping driving motor rotates around the shaft, one end of a force transfer rod hinged with the crank is driven to rotate around the rotating shaft of the pumping driving motor, the force transfer rod, a connecting rod and a swing rod are driven to move, the swing rod can only swing around a swing rod positioning shaft and further can drive the connecting rod to swing, the connecting rod drives a guide slide rod to horizontally reciprocate through a hinge, so that the concrete cylinders complete suction and discharge actions, and two groups of crank-connecting rod driving devices can drive two groups of concrete cylinders to simultaneously complete a suction and discharge cycle under the cooperative driving of a main motor.

The lubricating device further comprises a lubricating unit and a temperature control unit, wherein the lubricating unit comprises a lubricating oil storage tank 350 and a plurality of lubricating oil pipes 351, and electromagnetic valves 352 are arranged on the lubricating oil pipes; the temperature control unit comprises a compressor 360, a condenser, a pump body cooler 361, a power cooler 362, a temperature sensor 363 and a controller.

The lubricating unit in this embodiment is composed of a lubricating oil reservoir, a lubricating oil pipe, and the like. The lubricating oil storage tank is arranged above the outside of the pump body and is connected with a lubricating oil pipe through an electromagnetic valve, the lubricating oil pipe is respectively connected with sliding assemblies such as a valve gap, a first cylinder body, a second cylinder body and a guide cylinder body through a plurality of pipelines, and the electromagnetic valve is arranged at the end of each pipeline to control the time and the quantity of oil supply. The arrangement of the lubricating system can enable the pump body to be in the best working state all the time, save energy and prolong the service life of the pump body.

The temperature control unit is composed of a cooling device, a temperature sensor, a pump body cooler, a power cooler and the like. The cooling device is arranged above the pump body, the refrigeration device integrated with components such as a compressor, a condenser and the like is respectively connected with the pump body cooler and the power cooler through pipelines, the pump body cooler is arranged in the pump body, the power cooler is arranged in the power shell and is an evaporator consisting of capillary tubes, but the pump body cooler is immersed in a water bath box arranged in the pump body and exchanges heat through the water bath box, and the power cooler exchanges heat by a fan arranged in the power shell. The temperature sensors are arranged at different positions in the pump body and the power shell, and the temperature in the valve device, the concrete pump and the power system can be accurately regulated and controlled by the temperature controller integrated in the controller, so that the valve device, the concrete pump and the power system are always in a safe state and keep higher working efficiency.

The 3D printer nozzle comprises a nozzle cylinder 210, a nozzle 220, a nozzle stirring unit, a thick liquid bar thickness adjusting unit and a thick liquid bar width adjusting unit, wherein a nozzle feeding pipe 212 and a mechanical arm 211 are arranged at the upper part of the nozzle cylinder 210; the nozzle 220 is arranged at the bottom of the sprayer charging barrel 210, and a discharging cavity of the nozzle 220 is rectangular; the spray head stirring unit is arranged in the spray head charging barrel 210 and is used for continuously stirring materials in the spray head charging barrel 210; the thick liquid strip thickness adjusting unit is arranged in the nozzle 220 and is used for adjusting the thickness of the thick liquid strip sprayed out from the nozzle 220; the sliver width adjusting unit is disposed at a lower portion of the nozzle 220, and is used for adjusting the width of the sliver ejected from the nozzle 220.

The nozzle stirring unit in this embodiment includes a nozzle stirring motor 213, a nozzle stirring shaft 214, and a nozzle stirring blade 215, and the nozzle stirring motor 213 is disposed at the top of the nozzle cartridge 210; the nozzle stirring shaft 214 is connected and arranged at the top of the nozzle charging barrel 210 through a sealing bearing, and the nozzle stirring motor 213 is in transmission connection with the nozzle stirring shaft 214; a shower head stirring blade 215 is provided on the shower head stirring shaft 214. The concrete slurry is continuously stirred in the printing process, so that the early setting and hardening of the slurry can be prevented, and the stable working performance of the slurry in the printing process is ensured.

Further, shower nozzle feed cylinder 210 in this embodiment is the U type, just shower nozzle feed cylinder 210 overall seal, specifically, can be through setting up the connecting plate at shower nozzle feed cylinder body top, the shower nozzle feed cylinder top that the cross-section is the U-shaped is whole with connecting plate bottom circumference fixed connection, forms the airtight cavity that can bear positive negative pressure, and the concrete slurry of being convenient for is extruded from the nozzle of bottom smoothly, and the U-shaped cross-section of shower nozzle feed cylinder bottom also is convenient for the whole flows of ground paste.

Connecting plate 216 is used for fixed shower nozzle agitator motor 213, shower nozzle (mixing) shaft 214 and shower nozzle inlet pipe 212, is sealing connection between connecting plate 216 and the shower nozzle feed cylinder body simultaneously, be provided with a plurality of detection sensor 240 on the lateral wall of shower nozzle feed cylinder 210, detection sensor 240 can be pressure sensor or level sensor for detect the spraying volume of concrete 3D printer shower nozzle, the feeding volume of the control shower nozzle inlet pipe of also being convenient for realizes entire system's effective regulation and control. Namely, a plurality of pressure sensors are arranged at different heights and are used together with a control system for regulating and monitoring the conveying amount of concrete slurry.

The width of the front and rear side walls parallel to the printing direction is shorter than that of the left and right side walls perpendicular to the printing direction, preferably, the thick liquid strip thickness adjusting unit in the embodiment comprises a valve plate 221 and a valve plate driving part 222, and the upper part of the valve plate 221 is hinged on one side wall of the discharging cavity of the nozzle 220; the valve plate driving portion 222 drives the valve plate 221 to rotate, two side walls of the valve plate 221 are in sliding fit with the side walls of the discharging cavity, the valve plate is hinged to the side walls of the discharging cavity through a valve plate rotating shaft, and the valve plate driving portion is driven by a valve plate driving motor. The valve plate is driven by the valve plate driving motor and drives the valve plate to rotate together, the opening of the nozzle can be adjusted by the rotation of the valve plate, and then the thickness of a printing layer is adjusted to adapt to concrete slurries with different flowability and different setting and hardening performances.

The width adjusting unit comprises a width adjusting base plate 231, a troweling plate and a width driving part, wherein the width adjusting base plate 231 is arranged on the outer side wall of the nozzle 220; the two troweling plates are oppositely arranged at the lower part of the nozzle 220 from left to right; the width driving part is disposed between the width adjusting substrate 231 and the troweling plate, and the width driving part adjusts a distance between the two troweling plates.

Specifically, the width driving part includes an adjusting screw 233, a nut, and a slip driving motor 234, the adjusting screw 233 being disposed on the width adjusting base 231, specifically, the adjusting screw is disposed on the width adjusting base through a bearing; the troweling plate is arranged on the adjusting screw 233 through a nut, and the upper end of the troweling plate is in fit sliding arrangement with the width adjusting base plate 231 or in matched sliding connection through a transverse sliding rail, so that a limiting effect is achieved, and the troweling plate is prevented from rotating; the adjusting screw 233 is driven to rotate by the slip driving motor 234. Further, in order to realize independent operation of the two troweling plates, the two troweling plates are respectively provided with a width adjustment substrate 231 and a width driving portion in correspondence thereto.

The device also comprises a lifting adjusting unit which drives the pulp strip width adjusting unit to move up and down relative to the nozzle 220; the lifting adjusting unit comprises a lifting seat 235 and a lifting driving part 236, the lifting seat 235 is fixedly arranged on the side wall of the nozzle 220, and the width adjusting substrate 231 is slidably arranged on the lifting seat 235; the elevation driving unit 236 drives the elevation of the width adjustment substrate 231. The lifting driving part in the embodiment is a lifting driving motor and a lifting screw, the lower end of the lifting screw is hinged to the corresponding width adjusting base plate, the width adjusting base plate is in sliding fit with the lifting seat through a lifting sliding rail or a lifting sliding groove, the width adjusting base plate is prevented from rotating in the lifting process, and therefore the width adjusting base plate can move up and down relative to the lifting seat in the rotating process of the lifting screw.

According to the structure, the two sets of the thick liquid strip thickness adjusting units and the lifting adjusting units which can move independently can be arranged, when only one side is required to be trimmed or a corner is met, the two sets of thick liquid strip thickness adjusting units can be adjusted to different heights, the higher requirement of the nozzle on the direction is met, and the thick liquid strip distortion and the generation of interlayer gaps are avoided.

Further, the single troweling plate in this embodiment includes a first troweling plate 2321, a curing agent spraying roller 2322, and a second troweling plate 2323 that are fixedly disposed in sequence, both the first troweling plate 2321 and the second troweling plate 2323 include a zigzag troweling surface, and a width between the two first troweling plates 2321 is wider than a width between the two second troweling plates 2323. The first troweling plate 2321 and the second troweling plate 2323 are arranged to eliminate a gap formed between the upper and lower castable layers through a transverse extrusion effect, and to smooth the vertical surface of the member through a transverse extrusion effect, so that accurate printing is realized, strength increase of the concrete member is promoted, and a more attractive external profile is created.

The curing agent spraying roller comprises an inner pipe 2324 and a sleeve 2325, the upper part of the inner pipe 2324 is fixed with the first troweling plate and the second troweling plate, connecting frames can be arranged at the tops of the first troweling plate, the second troweling plate and the inner sleeve, the connecting frames are used for realizing the connection and fixation of the first troweling plate, the second troweling plate and the inner sleeve, the connecting frames are connected onto an adjusting screw rod through nuts to realize transverse movement, the inner pipe is connected with a curing agent feeding pipe, and the inner pipe is provided with spraying holes 2327 with openings facing the pulp strips; the lantern ring cover is established on the inner tube, and can freely rotate the action, the lantern ring with form clearance layer 2326 between the inner tube, the equipartition has been seted up on the lantern ring and has been paintd the hole 2328 the outside that the roller was spouted to the curing agent is provided with the protection casing, can avoid the curing agent to flow to the outside.

First troweling board and second troweling board have the same structure cross section of buckling, and the rear portion is parallel with the printing direction of concrete ground paste strip, and the front portion is buckled to the outside that the direction was printed to the ground paste strip, and the left and right sides corresponds a set of first troweling board that sets up and forms loudspeaker form opening, and the adjustment width makes the opening width be greater than the width of ground paste strip during printing, buckles through first troweling board and is the shrink extrusion of loudspeaker form structure, makes ground paste strip lateral surface obtain preliminary trimming. The thick liquids strip lateral surface after preliminary trimming spouts the roller contact along with going on of printing with the curing agent, the curing agent spouts the roller and is double-deck cylindric structure, and the center layer is the inner tube, and its upper end is fixed, and the inboard of orientation concrete thick liquids strip is supreme down to set up the several orifice, and the inner tube sets up the lantern ring outward, and the two adopts clearance fit, forms the clearance layer, and the inner tube bottom sets up the evagination ring structure that can the bearing lantern ring, prevents the lantern ring landing. More spray holes with small apertures are regularly arranged in the circumferential direction of the lantern ring, the inner tube sprays the conveyed maintenance agent into the gap layer through the spray holes to form a thin film, and then the maintenance agent is coated on the outer side face of the slurry strip through the coating holes in the lantern ring. The setting of clearance layer is convenient for the cover and is encircleed the inner tube rotation, makes the lantern ring only exert transverse pressure to the lateral surface of ground paste strip to through the tearing crack of transverse extrusion effect restoration because of first floating plate to the slant extrusion production of ground paste strip, evenly paint the lateral surface at the ground paste strip with the curing agent simultaneously. Along with the printing, the outer side face of the slurry strip sprayed with the curing agent is in contact with a second troweling plate, and the width between a pair of second troweling plates consisting of the left side and the right side is smaller than the width between the first troweling plates so as to further extrude the slurry strip and perform plastering, finishing and shaping. The curing agent spraying roller is connected with the raw material tank through a liquid conveying pipe, and the supply amount is controlled through an electromagnetic valve, a flowmeter and a control system.

The printing trace control is controlled by the mechanical arm, the mechanical arm can move along an X-Y-Z axis according to a set program, the rotation of the printing nozzle is controlled, the extrusion of the material by the adjusting nozzle is adjusted, and the like, so that the multi-coordinate linkage control is realized.

A material conveying machine is arranged between the conveying pump and the 3D printer nozzle, and comprises a material conveying pipe, a material conveying screw and a material conveying driving motor 405; the material conveying pipe is a straight pipe 401 or/and a flexible bent pipe 402, a rigid material conveying spiral 403 is distributed in the straight pipe, and a flexible material conveying spiral 404 is arranged in the flexible bent pipe; when the conveying pipe is a flexible bent pipe 402 or the conveying pipe is formed by splicing a straight pipe 401 and the flexible bent pipe 402, a pressurizing unit is further arranged, the pressurizing unit comprises a pressurizing shell 406, a gear box 407, a force transmission shaft 408 and a pressurizing motor 409, and connecting flanges 410 are arranged at two ends of the pressurizing shell; the gear box is arranged at the side part of the supercharging shell, and a plurality of transmission gears 411 which are meshed in a matching way are distributed in the gear box; the force transmission shaft 408 is arranged in the supercharging shell, two ends of the force transmission shaft 408 are connected with corresponding rigid conveying screws or flexible conveying screws, an assembly cavity is arranged in the supercharging shell, the assembled force transmission shaft is arranged in the assembly cavity through a force transmission bearing, and a force transmission gear 412 meshed with a transmission gear at the output end of the gear box is arranged on the force transmission shaft; the booster motor 409 is arranged on the gear box 407, and the booster motor 409 is meshed with a transmission gear 411 at the input end of the gear box 407.

The method comprises the following steps that the mixture discharged from a concrete pump enters a rigid conveying pipe (namely a straight pipe) at the head end of a conveying machine, a rigid conveying screw is arranged in the rigid conveying pipe to push the mixture to be conveyed, a head end conveying driving motor with a main shaft connected with a rigid conveying screw rotating shaft is arranged at the front end of the rigid conveying pipe, and the rigid conveying screw rotating shaft is connected with the front end of the rigid conveying pipe through a coupler and a bearing. When the conveying distance is longer, a plurality of sections of rigid conveying pipes can be connected through connecting pieces, and each connecting piece comprises a flange plate arranged at the end part of each rigid conveying pipe, a sealing ring matched with the flange plate in size and a fastening bolt. When the direction needs to be changed, a flexible material conveying pipe (namely a flexible bent pipe) is adopted, a material conveying spiral of the flexible material conveying pipe is a flexible material conveying spiral, and a corresponding rotating shaft is a flexible rotating shaft. The tail end of the flexible conveying pipe is connected with the supercharger and then connected with the rigid conveying pipe, and the two ends of the flexible conveying pipe can be connected with the supercharger and then connected with the rigid conveying pipe. The setting of booster can offset the torsion that the frictional resistance brought the flexible pivot because of between flexible conveying pipeline, flexible conveying spiral, the flexible pivot of defeated material in-process, the atress at balanced flexible pivot both ends stabilizes the propelling movement pressure of UHPC mixture in the flexible conveying pipeline, improves transport efficiency. The tail end of a tail end rigid material conveying pipe connected with the printing nozzle is provided with a tail end material conveying driving motor, a rotating shaft of a corresponding material conveying screw penetrates through a bearing and is connected with a main shaft of the tail end material conveying driving motor through a coupler, the tail end material conveying driving motor can balance stress of the rotating shaft of the corresponding material conveying screw, stable conveying pressure is provided for UHPC mixture, and the mixture is pushed into the printing nozzle. The main parts of the rigid conveying pipeline, the flexible conveying pipeline, the supercharger, the connecting piece and the like are more than one. The preferred rigidity conveying pipeline when the defeated material in-process need not the redirecting, can set up flexible conveying pipeline between rigidity conveying pipeline when needs redirecting, also can all use flexible conveying pipeline, when choosing two kinds of conveying pipelines, flexible conveying pipeline is connected with the preferred booster of rigidity conveying pipeline. The head end and the tail end of the material conveying machine are respectively connected with the concrete delivery pump and the 3D printing nozzle through connecting pipes, and sealing bearings are arranged among the connecting pipes, the concrete delivery pump and the 3D printing nozzle, so that the material conveying machine can rotate conveniently and torsion is eliminated. A pressure sensor is arranged in a connecting pipe between the material conveyor and the concrete delivery pump, and can provide initial thrust of UHPC (ultra high Performance concrete) mixtures in the material conveyor for a control system.

The control system comprises a microcomputer, a controller, a stirring system, a solid material supply device, a liquid material supply device and a pressurizing device, wherein the stirring system, the solid material supply device, the liquid material supply device and the pressurizing device are respectively connected with a vacuum stirrer, and various sensors are respectively connected with a concrete delivery pump, a material conveyor and a 3D printing nozzle. The various sensors respectively transmit analog signals such as the collected motor rotating speed, material flow, vacuum degree, temperature in a concrete pump, pressures in a material conveyer and a printing spray head, rotating speeds of various motors and the like to the controller through cables, and the controller records and stores data after converting digital-to-analog signals and displays the data in real time through a display of a microcomputer. The control system also comprises a printing trace control and drive system, and the mechanical arm and a control device for controlling the movement of the mechanical arm can enable the mechanical arm to move along an X-Y-Z axis according to a set program, control the rotation of a printing nozzle, adjust the extrusion of a nozzle to a material and the like, and realize multi-coordinate linkage control.

Change the utility model discloses a concrete specification, size, form etc. of agitator tank, printing shower nozzle, defeated material machine, concrete pump and controlling means if change traditional hydraulic drive concrete pump with the concrete pump, or change traditional S pendulum valve etc. into the disc valve, are 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

1. The utility model provides a 3D prints feed system for ultra-high performance concrete which characterized in that includes:

the main stirring unit is used for stirring the materials in the stirring tank;

3D print head, the discharge end of delivery pump with 3D print head connects.

2. The 3D printing feeding system for ultra-high performance concrete according to claim 1, wherein the delivery pump comprises:

a pump body;

a rotation driving unit for driving the disc valve to rotate;

3. The feeding system for 3D printing of ultrahigh-performance concrete according to claim 2, wherein the pumping driving part comprises a power housing, a pumping driving motor and two groups of crank connecting rod units, the driving ends of the two groups of crank connecting rod units are connected with the pumping driving motor, and the pump cylinder pistons in the first cylinder body and the second cylinder body are connected with the action ends of the corresponding crank connecting rod units through piston rods; the crank link unit includes:

a dowel bar, wherein the first end of the dowel bar is hinged with the crank;

4. The feeding system for 3D printing of ultra-high performance concrete according to claim 3, wherein the outer diameters of the first cylinder and the second cylinder are the same as the outer diameter of the material suction pipe, and the outer diameters of the first cylinder and the second cylinder are larger than the outer diameter of the reversing pipe; the front ends of the first cylinder body and the second cylinder body are both provided with arc segment elbows, the front part of the pump cylinder piston is provided with a material pushing plate connecting rod and a material pushing plate, the material pushing plate connecting rod is hinged with the material pushing plate, the front end of the material pushing plate is an arc surface matched with the circumferential direction of the disc valve, the side wall of the material pushing plate is provided with an arc side wall matched with the arc segment elbows, a linear bearing sliding hole is formed in the pump cylinder piston, the rear end of the material pushing plate connecting rod is T-shaped, and the rear end of the material pushing plate connecting rod is matched and arranged in the linear bearing sliding hole;

5. The feeding system for 3D printing of ultra-high performance concrete according to claim 2, further comprising a lubricating unit and a temperature control unit, wherein the lubricating unit comprises a lubricating oil storage tank and a plurality of lubricating oil pipes, and electromagnetic valves are arranged on the lubricating oil pipes; the temperature control unit comprises a compressor, a condenser, a pump body cooler, a power cooler, a temperature sensor and a controller.

6. The feeding system for 3D printing of ultra-high performance concrete according to any one of claims 1 to 5, wherein the 3D printer head comprises:

7. The feeding system for 3D printing of ultrahigh-performance concrete according to claim 6, wherein the stuff strip thickness adjusting unit comprises a valve plate and a valve plate driving part, wherein the upper part of the valve plate is hinged to one side wall of the discharging cavity of the nozzle; the valve plate driving part drives the valve plate to rotate, and two side walls of the valve plate are in sliding fit with the side walls of the discharging cavity;

the sprayer charging barrel is U-shaped and is integrally sealed, and a plurality of detection sensors are arranged on the side wall of the sprayer charging barrel; the nozzle stirring unit comprises a nozzle stirring motor, a nozzle stirring shaft and a nozzle stirring blade, and the nozzle stirring motor is arranged at the top of the nozzle charging barrel; the spray head stirring shaft is connected and arranged at the top of the spray head charging barrel through a sealing bearing, and the spray head stirring motor is in transmission connection with the spray head stirring shaft; the nozzle stirring blade is arranged on the nozzle stirring shaft;

the two troweling plates are respectively and correspondingly provided with a width adjusting substrate and a width driving part, and the two troweling plates respectively and independently act; the single troweling plate comprises a first troweling plate, a curing agent spraying roller and a second troweling plate which are fixedly arranged in sequence, the first troweling plate and the second troweling plate respectively comprise a zigzag troweling surface, and the width between the two first troweling plates is wider than the width between the two second troweling plates;

the curing agent spray roller comprises:

8. The feeding system for 3D printing of ultra-high performance concrete according to claim 1, wherein a feeding machine is provided between the feeding pump and the 3D printer head, the feeding machine comprising a feeding pipe, a feeding screw, and a feeding driving motor; the material conveying pipe is a straight pipe or/and a flexible bent pipe, a rigid material conveying spiral is distributed in the straight pipe, and a flexible material conveying spiral is arranged in the flexible bent pipe;

9. The 3D printing feeding system for ultra-high performance concrete according to claim 1, wherein the main stirring unit comprises:

the fixing rods are vertically arranged in the stirring tank;

10. The feeding system for 3D printing of ultra-high performance concrete according to claim 9, wherein the bottom of the stirring tank is U-shaped, the end of the stirring paddle is provided with a material turning plate, the material turning plate is provided with a sweepback angle and a side inclination angle, and at least part of the material turning plate is attached to the bottom of the stirring tank;