阅读说明：本技术 一种高稳定性的混凝土膨胀剂及其制备方法 (High-stability concrete expanding agent and preparation method thereof ) 是由 许丽娟 于 2021-01-15 设计创作，主要内容包括：本发明公开了一种高稳定性的混凝土膨胀剂及其制备方法,旨在提供一种膨胀效果好且长期稳定的高稳定性的混凝土膨胀剂及其制备方法。按质量百分比计,它包括膨胀剂专用熟料18～22％、过烧石灰18～22％、硬石膏38～42％、矿石5%～8%,炭渣5%～8%、轻烧氧化镁4～6％、煤渣14～16％、塑性膨胀剂0.2～0.3％和柠檬酸0.2～0.3％。本发明的有益效果是：膨胀效果好且长期稳定。(The invention discloses a high-stability concrete expanding agent and a preparation method thereof, and aims to provide a long-term stable high-stability concrete expanding agent with a good expansion effect and a preparation method thereof. The composite material comprises, by mass, 18-22% of special clinker for an expanding agent, 18-22% of burnt lime, 38-42% of anhydrite, 5-8% of ore, 5-8% of carbon residue, 4-6% of light-burned magnesium oxide, 14-16% of coal slag, 0.2-0.3% of a plastic expanding agent and 0.2-0.3% of citric acid. The invention has the beneficial effects that: the expansion effect is good and stable for a long time.)

1. The high-stability concrete expanding agent is characterized by comprising, by mass, 18-22% of special clinker for the expanding agent, 18-22% of burnt lime, 38-42% of anhydrite, 5-8% of ore, 5-8% of carbon residue, 4-6% of light-burned magnesium oxide, 14-16% of coal residue, 0.2-0.3% of plastic expanding agent and 0.2-0.3% of citric acid.

2. A preparation method of a high-stability concrete expanding agent is characterized by comprising the following steps:

firstly, putting blocky clinker into a crusher (22) for crushing;

secondly, collecting the crushed clinker in a material collecting bin (24) through a discharging pipe (23);

conveying the clinker in the aggregate bin (24) to a ball mill (26) by a screw conveyor (25) for grinding;

conveying the ground clinker into a vibrating screen (27) for screening, conveying the clinker with the qualified fineness into a preparation device (28), returning the clinker with the unqualified fineness into a ball mill (26) for re-grinding, and conveying the clinker into the vibrating screen (27) again for screening until the fineness reaches the standard;

step five, repeating the operation of the rest raw materials according to the step one to the step four in sequence until all the raw materials are ground into powder with the fineness reaching the standard, and conveying the powder into a preparation device (28);

step six, starting a preparation device (28) to stir and mix to finally prepare the concrete expanding agent;

and seventhly, conveying the concrete expanding agent into the automatic material injection device (29), and quantitatively mixing the concrete expanding agent into the concrete through the automatic material injection device (29).

3. The preparation method of the concrete expanding agent with high stability according to claim 2, wherein the preparation device (28) comprises a box body (1), a stirring barrel (2) is arranged in the box body (1), two ends of the stirring barrel (2) are respectively provided with a torsion device (3), the stirring barrel (2) is connected with the box body (1) through the torsion devices (3), the top of the stirring barrel (2) is provided with a feeding hole (4), the feeding hole (4) is internally provided with a first electric valve (5), the bottom of the stirring barrel (2) is provided with a discharging hole (6), the discharging hole (6) is internally provided with a second electric valve (7), the box body (1) is provided with a feeding pipe (8) corresponding to the feeding hole (4) and a discharging pipe (9) corresponding to the discharging hole (6), the box body (1) is connected with a vibrating screen (27) through the feeding pipe (8), the box body (1) is connected with an automatic material injection device (29) through a discharge pipe (9).

4. The preparation method of the concrete expanding agent with high stability according to claim 3, wherein the torsion device (3) comprises a universal joint (10) and an eccentric wheel (11), one end of the universal joint (10) is fixedly connected with the end part of the stirring barrel (2), the other end of the universal joint (10) is fixedly connected with the eccentric wheel (11), one end of the box body (1) is provided with a first servo motor (12), the first servo motor (12) is arranged on the outer side of the box body (1), the first servo motor (12) is provided with an output shaft (13), one end of the output shaft (13) is fixedly connected with the first servo motor (12), the other end of the output shaft (13) penetrates through the side wall of the box body (1) and is positioned in the box body (1), one universal joint (10) is connected with the output shaft (13) through the corresponding eccentric wheel (11) and is positioned at the bottom part of the stirring barrel (2), the other end of box (1) is equipped with axis of rotation (14), the one end of axis of rotation (14) is equipped with bearing (15), axis of rotation (14) are connected with the inside wall rotation of box (1) through bearing (15), and another universal joint (10) just are located the top of agitator (2) through corresponding eccentric wheel (11) and the other end fixed connection of axis of rotation (14).

5. The preparation method of the concrete expanding agent with high stability according to claim 4, wherein a plurality of chains (16) are arranged in the box body (1), one end of each chain (16) is fixedly connected with the top of the box body (1), the other end of each chain (16) is provided with an impact ball (17), each impact ball (17) is fixedly connected with each chain (16), and the length of each chain (16) is greater than the minimum distance from the stirring barrel (2) to the inner side wall of the top of the box body (1) and less than the maximum distance from the stirring barrel (2) to the inner side wall of the top of the box body (1).

6. The preparation method of the concrete expanding agent with high stability as claimed in claim 4, wherein the feeding port (4) and the discharging port (6) are both fixedly connected with a soft connecting piece, the feeding port (4) and the discharging port (6) are respectively connected with the inner side wall of the box body (1) in a sliding manner through the soft connecting pieces corresponding to the feeding port (4), the feeding port (4) is communicated with the interior of the feeding pipe (8) through the soft connecting piece, and the discharging port (6) is communicated with the interior of the discharging pipe (9) through the soft connecting piece.

7. The preparation method of the concrete expanding agent with high stability according to claim 6, wherein the soft connecting piece comprises a T-shaped sliding block (18) and a soft connecting pipe (19), a through hole (20) communicated with the interior of the soft connecting pipe (19) is arranged in the T-shaped sliding block (18), the feeding port (4) is fixedly connected with the T-shaped sliding block (18) through the soft connecting pipe (19) corresponding to the feeding port, the discharging port (6) is fixedly connected with the T-shaped sliding block (18) through the soft connecting pipe (19) corresponding to the discharging port, the box body (1) is cylindrical, a sound insulation layer is arranged in the side wall of the box body (1), two annular sliding chutes (21) respectively matched with the T-shaped sliding block (18) on the feeding port (4) and the T-shaped sliding block (18) on the discharging port (6) are arranged on the inner side wall of the box body (1), the feeding pipe (8) is communicated with the interior of one of the annular sliding chutes (21, the discharge pipe (9) is communicated with the inside of the other annular chute (21).

8. The preparation method of the concrete expanding agent with high stability according to claim 3, wherein the automatic material injection device (29) comprises an outer box (30) and an inner box (31), the inner box (31) is arranged in the outer box (30), a gravity sensor (32) is arranged in the outer box (30), the gravity sensor (32) is arranged at the bottom of the outer box (30) and is in contact with the bottom of the inner box (31), the discharge pipe (9) is provided with a delivery pump (33), one end of the discharge pipe (9) is connected with the box body (1), the other end of the discharge pipe (9) sequentially penetrates through the top of the outer box (30) and the top of the inner box (31) and is positioned in the inner box (31), the discharge pipe (9) is in sealed connection with the outer box (30), the bottom of the inner box (31) is provided with a discharge opening (34), and an electric valve III (35) is arranged in the discharge opening (34), the bottom of outer container (30) is equipped with the feed inlet (36) corresponding with discharge opening (34), be equipped with flow control device in feed inlet (36).

9. The preparation method of the concrete expansive agent with high stability as claimed in claim 8, wherein the flow control device comprises an adjusting plate (37) and a second servo motor (38), the adjusting plate (37) is circular, an adjusting hole (39) is provided on the adjusting plate (37), the adjusting hole (39) is located at one side of the adjusting plate (37), the other side of the adjusting plate (37) completely covers the injection port (36), a ring-shaped limiting plate (40) is provided at the side edge of the adjusting plate (37), the height of the ring-shaped limiting plate (40) is greater than the thickness of the adjusting plate (37), the ring-shaped limiting plate (40) is perpendicular to the adjusting plate (37), the inner side of the ring-shaped limiting plate (40) is fixedly connected with the adjusting plate (37), a plurality of uniformly distributed transmission teeth (41) are provided at the outer side of the ring-shaped limiting plate (40), be equipped with on the lateral wall of sprue (36) and rotate groove (42), the open end and regulating plate (37) phase-match in rotation groove (42), the bottom of rotating groove (42) respectively with ring limiting plate (40) and driving gear (41) phase-match, the bottom of outer container (30) is equipped with rotates chamber (43), it is linked together with rotation groove (42) to rotate chamber (43), be equipped with in rotation chamber (43) with driving gear (41) engaged with gear (44), install in the bottom of outer container (30) servo motor two (38), the output and gear (44) of servo motor two (38) are connected.

10. The method for preparing a high-stability concrete expansive agent according to claim 8, wherein the thickness of the bottom of the inner box (31) is gradually reduced from the edge to the discharge opening (34).

Technical Field

The invention relates to the technical field of expansive agents, in particular to a high-stability concrete expansive agent and a preparation method thereof.

Background

The expansion agent material is a common concrete expansion agent in the main production, the concrete is cracked due to dry shrinkage and cold shrinkage and different degrees of shrinkage of the concrete at different ages in the hardening process, the expansion performance of the expansion agent is introduced to introduce quantitative volume expansion, compensate the shrinkage value of the concrete and prevent the concrete from shrinkage cracking and influencing the structural durability, function and appearance of the concrete. In recent years, with the wide use of high-performance concrete and the wide application of ultra-long seamless construction technology, the self-waterproofing of the structure of the concrete is highly emphasized, and the concrete expanding agent is an important material for preparing the anti-cracking waterproof concrete, is also emphasized by various industries, and is widely applied.

The main components of the early expanding agent are gypsum and calcium sulfate (including monocalcium sulfate, dicalcium sulfate and tricalcium sulfate), and the problems of low expansion rate and low expansion energy exist when the early expanding agent is prepared by calcined kaolin, high-alumina coal gangue, alunite, anhydrous calcium sulphoaluminate or calcium aluminate clinker and gypsum in a later period of time. After the cement is matched with concrete for use, the expansion effect is gradually weakened or even disappears along with the time especially in arid areas, and the long-term stability of the cement strength is not facilitated.

Disclosure of Invention

The invention provides a concrete expanding agent with good expansion effect, long-term stability and high stability and a preparation method thereof, aiming at overcoming the defect that the expansion effect is gradually weakened along with the time in the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme:

the high-stability concrete expanding agent comprises, by mass, 18-22% of special clinker for the expanding agent, 18-22% of burnt lime, 38-42% of anhydrite, 5-8% of ore, 5-8% of carbon residue, 4-6% of light-burned magnesium oxide, 14-16% of coal residue, 0.2-0.3% of plastic expanding agent and 0.2-0.3% of citric acid.

18-22% of special clinker for expanding agent, 18-22% of over-burnt lime, 38-42% of anhydrite, 5-8% of ore, 5-8% of carbon residue, 4-6% of light-burnt magnesia, 14-16% of coal residue, 0.2-0.3% of plastic expanding agent and 0.2-0.3% of citric acid. The clinker special for the expanding agent is preferably calcium sulphoaluminate and calcium oxide clinker, and the plastic expanding agent is preferably a foaming agent DC; the expansion performance index is higher than that of the existing expanding agent, the requirement of material production is met, and the purposes of good expansion effect and long-term stability are achieved.

The invention also provides a preparation method of the high-stability concrete expanding agent, which comprises the following steps:

firstly, putting blocky clinker into a crusher to be crushed;

secondly, collecting the crushed clinker in a material collecting bin through a discharging pipe;

conveying the clinker in the aggregate bin to a ball mill by a screw conveyor for grinding;

conveying the ground clinker into a vibrating screen for screening, conveying the clinker with the qualified fineness into a preparation device, returning the clinker with the unqualified fineness into a ball mill for re-grinding, and conveying the clinker into the vibrating screen again for screening until the fineness reaches the standard; the vibrating screen is the prior art and can screen materials in a grading way, the top of the vibrating screen is provided with a feeding port, screens with different mesh numbers are sequentially arranged in the vibrating screen from top to bottom, and the mesh numbers are gradually increased from top to bottom so as to meet the grading screening of different raw materials on different thickness precision requirements, thereby being beneficial to improving the stability of the expanding agent; and returning the raw materials which do not meet the fineness into the ball mill again for grinding so as to improve the utilization rate of the raw materials and ensure that the mixture ratio is more accurate.

Step five, respectively repeating the operation of the rest raw materials according to the step one to the step four in sequence until all the raw materials are ground into powder with the fineness reaching the standard, and conveying the powder into a preparation device; according to different performance characteristics of different raw materials, the raw materials are respectively ground into required standard fineness and then mixed and stirred, which is beneficial to improving the stability of the expanding agent.

Step six, starting the preparation device to stir and mix to finally prepare the concrete expanding agent;

and step seven, conveying the concrete expanding agent into the automatic material injection device, and quantitatively mixing the concrete expanding agent into the concrete through the automatic material injection device. Thereby being beneficial to accurately controlling the proportion of the expanding agent and the cement during mixing and achieving the purposes of good expanding effect and long-term stability.

Preferably, the preparation facilities include the box, be equipped with the agitator in the box, the both ends of agitator all are equipped with torsion device, the agitator passes through torsion device and is connected with the box, the top of agitator is equipped with the feed inlet, be equipped with motorised valve one in the feed inlet, the bottom of agitator is equipped with the discharge gate, be equipped with motorised valve two in the discharge gate, be equipped with respectively with the corresponding inlet pipe of feed inlet and with the corresponding discharging pipe of discharge gate on the box, the box is connected with the shale shaker through the inlet pipe, the box is connected with automatic notes material device through the discharging pipe. In the initial state, the electric valve I and the electric valve II are both in a closed state; opening the electric valve I, and conveying the ground raw materials into a stirring barrel through a feeding pipe for mixing and stirring; the stirring barrel does uniform-speed twisting motion in the box body through the twisting devices at the two ends to replace the traditional built-in stirring device to uniformly mix the raw materials in the stirring barrel, the processing technology is simple, the equipment cost is reduced, meanwhile, the problems that the built-in stirring device is easy to adhere to the raw materials and is not easy to clean are avoided, the utilization rate of the raw materials is improved, the proportioning of the raw materials is more accurate, and the improvement of the stability of the expanding agent is facilitated; the raw materials that the ratio is good are carried to automatic annotating in the material device through the discharging pipe, reasonable in design.

Preferably, the torsion device comprises a universal joint and an eccentric wheel, one end of the universal joint is fixedly connected with the end part of the stirring barrel, the other end of the universal joint is fixedly connected with the eccentric wheel, one end of the box body is provided with a first servo motor, the first servo motor is arranged on the outer side of the box body, an output shaft is arranged on the first servo motor, one end of the output shaft is fixedly connected with the first servo motor, the other end of the output shaft penetrates through the side wall of the box body and is positioned in the box body, one universal joint is connected with the output shaft through a corresponding eccentric wheel and is positioned at the bottom of the stirring barrel, the other end of box is equipped with the axis of rotation, the one end of axis of rotation is equipped with the bearing, the axis of rotation passes through the bearing and is connected with the inside wall rotation of box, and another universal joint passes through the other end fixed connection of corresponding eccentric wheel and axis of rotation and is located the top of agitator. Setting a relevant parameter of a servo motor I, and closing an electric valve I after the ground raw material is conveyed into the stirring barrel through a feeding pipe; starting the first servo motor, wherein the first servo motor drives one end of the stirring barrel to rotate, so that the stirring barrel does uniform torsional motion under the action of the eccentric wheel and the universal joint to uniformly mix the raw materials in the stirring barrel, and the design is reasonable and simple; after the agitator work finishes, servo motor drives the agitator and gets back to the home position for the position of feed inlet is corresponding with the position of inlet pipe, and the position of discharge gate is corresponding with the discharging pipe, and the expanding agent that makes in the agitator of being convenient for is followed the discharging pipe ejection of compact, does benefit to simultaneously next time through the inlet pipe feeding.

Preferably, a plurality of chains are arranged in the box body, one end of each chain is fixedly connected with the top of the box body, an impact ball is arranged at the other end of each chain, the impact balls are fixedly connected with the chains, and the raw materials in the stirring barrel are dry powder, so that the powder is easily adsorbed on the inner side wall of the stirring barrel when the stirring barrel works, the impact balls generate inertia under the action of the chains and continuously impact the outer side wall of the stirring barrel when the stirring barrel does uniform torsional motion, the outer side wall of the stirring barrel generates oscillation, the powder adsorbed on the inner side wall of the stirring barrel is favorably stripped, the utilization rate of the raw materials is improved, and the stability of the expanding agent is favorably improved; the length of chain is greater than the minimum distance of agitator to box top inside wall, and is less than the maximum distance of agitator to box top inside wall, helps the striking ball can strike with the lateral wall of agitator, reasonable in design mutually.

Preferably, equal fixedly connected with soft union piece on feed inlet and the discharge gate, feed inlet and discharge gate are respectively through the inside wall sliding connection of rather than corresponding soft union piece and box, the feed inlet is linked together through the inside of soft union piece and inlet pipe, the discharge gate is linked together through the inside of soft union piece and discharging pipe. The design of soft connector helps improving the rate of utilization of raw materials, prevents that the raw materials after grinding from scattering outside the device, does benefit to the agitator simultaneously and does the torsional motion.

Preferably, the soft connecting piece comprises a T-shaped sliding block and a soft connecting pipe, a through hole communicated with the inside of the soft connecting pipe is formed in the T-shaped sliding block, the feeding hole is fixedly connected with the T-shaped sliding block through the soft connecting pipe corresponding to the feeding hole, the discharging hole is fixedly connected with the T-shaped sliding block through the soft connecting pipe corresponding to the discharging hole, the box body is cylindrical, a sound insulation layer is arranged in the side wall of the box body, two annular sliding grooves respectively matched with the T-shaped sliding block on the feeding hole and the T-shaped sliding block on the discharging hole are formed in the inner side wall of the box body, the feeding pipe is communicated with the inside of one of the annular sliding grooves, and the discharging pipe. The T-shaped sliding block on the flexible connecting pipe is matched with the annular chute, so that the stirring barrel can do torsional motion conveniently; the box body is cylindrical, so that the T-shaped sliding block can slide along the annular sliding groove conveniently; because the striking ball can produce the noise when striking the agitator lateral wall, so the puigging helps isolated box internal noise, does benefit to the environmental protection.

As preferred, automatic annotate material device includes outer container and inner box, the inner box is arranged in the outer container, be equipped with gravity sensor in the outer container, gravity sensor installs in the bottom of outer container and contacts with the bottom of inner box, be equipped with the delivery pump on the discharging pipe, the one end and the box of discharging pipe are connected, the other end of discharging pipe runs through the top of outer container and the top of inner box in proper order is located the inner box, discharging pipe and outer container sealing connection, the bottom of inner box is equipped with the discharge opening, be equipped with motorised valve three in the discharge opening, the bottom of outer container is equipped with the sprue corresponding with the discharge opening, be equipped with flow control device in the sprue. The discharge pipe is hermetically connected with the outer box, so that the utilization rate of raw materials is improved, the ground raw materials are prevented from flying outside the device, and the environment is protected; when the configured expanding agent is conveyed into the inner box through the discharge pipe, the gravity sensor senses the weight of the expanding agent in the inner box, when the weight reaches a set value, the gravity sensor transmits a signal to the control system, the control system controls and closes the conveying pump, so that the total amount of the required expanding agent is accurately controlled, and then the powder discharging rate of the expanding agent is controlled through the flow control device, so that on one hand, the situation that the powder is blown up and sucked into a human body due to the fact that the powder discharging rate is too high, the human body health is harmed, and raw materials are wasted at the same time can be prevented; on the other hand, the amount of the expanding agent mixed each time can be controlled in the process of mixing with the concrete, so that the expanding agent is favorably and uniformly mixed with the concrete.

Preferably, the flow control device comprises an adjusting plate and a servo motor II, the adjusting plate is circular, an adjusting hole is formed in the adjusting plate and located on one side of the adjusting plate, the other side of the adjusting plate completely covers the injection port, an annular limiting plate is arranged on the side edge of the adjusting plate, the height of the annular limiting plate is larger than the thickness of the adjusting plate, the annular limiting plate is perpendicular to the adjusting plate, the inner side of the annular limiting plate is fixedly connected with the adjusting plate, a plurality of transmission teeth are uniformly distributed on the outer side of the annular limiting plate, a rotating groove is formed in the side wall of the injection port, the opening end of the rotating groove is matched with the adjusting plate, the bottom of the rotating groove is respectively matched with the annular limiting plate and the transmission teeth, a rotating cavity is formed in the bottom of the outer box and is communicated with, the rotating cavity is internally provided with a gear meshed with the transmission gear, the second servo motor is installed at the bottom of the outer box, and the output end of the second servo motor is connected with the gear. In an initial state, the other side of the adjusting plate completely covers the injection port; the control system controls to start the servo motor II to realize automatic material injection; when the opening size of the injection port needs to be adjusted to control the powder discharging rate or the powder discharging amount of the expanding agent, setting relevant parameters of a servo motor II and starting the servo motor II, wherein the servo motor II drives an adjusting plate to rotate through a gear so as to adjust the contact ratio of an adjusting hole and the injection port; the annular limiting plate is favorable for the regulating plate to rotate in the rotating groove all the time, and the stability of the structure is improved.

Preferably, the thickness of the bottom of the inner box is gradually reduced from the edge to the discharge opening. The design is favorable for improving the discharging rate and the utilization rate of the expanding agent and has reasonable design.

The invention has the beneficial effects that: the expansion effect is good and stable for a long time; the utilization rate of raw materials is improved; the raw material proportion is more accurate; the preparation device has simple processing technology, reduces the cost, and simultaneously avoids the problems that the built-in stirring device is easy to adhere raw materials and is difficult to clean; is beneficial to environmental protection; accurately controlling the mixing amount and flow rate of the expanding agent and the concrete; the design is reasonable.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the structure of a production apparatus;

FIG. 3 is a schematic structural view of an automatic injection device;

fig. 4 is an enlarged view at a in fig. 3.

In the figure: 1. the automatic material injection device comprises a box body, 2, a stirring barrel, 3, a torsion device, 4, a material inlet, 5, an electric valve I, 6, a material outlet, 7, an electric valve II, 8, a material inlet pipe, 9, a material outlet pipe, 10, a universal joint, 11, an eccentric wheel, 12, a servo motor I, 13, an output shaft, 14, a rotating shaft, 15, a bearing, 16, a chain, 17, a striking ball, 18, a T-shaped sliding block, 19, a soft connecting pipe, 20, a through hole, 21, an annular sliding chute, 22, a crusher, 23, a material discharging pipe, 24, a material collecting bin, 25, a spiral conveyor, 26, a ball mill, 27, a vibrating screen, 28, a preparation device, 29, an automatic material injection device, 30, an outer box, 31, an inner box, 32, a gravity sensor, 33, a conveying pump, 34, a material discharging port, 35, 37. the adjusting plate 38, the servo motor II, 39, the adjusting hole 40, the annular limiting plate 41, the transmission gear 42, the rotating groove 43, the rotating cavity 44 and the gear.

Detailed Description

The invention is further described with reference to the following figures and detailed description.

A high-stability concrete expanding agent comprises 18-22% of special clinker for the expanding agent, 18-22% of burnt lime, 38-42% of anhydrite, 5-8% of ore, 5-8% of carbon residue, 4-6% of light-burned magnesia, 14-16% of coal residue, 0.2-0.3% of plastic expanding agent and 0.2-0.3% of citric acid.

As shown in fig. 1, the invention also provides a preparation method of the concrete expanding agent with high stability, which comprises the following steps:

firstly, putting the blocky clinker into a crusher 22 for crushing;

secondly, collecting the crushed clinker in a material collecting bin 24 through a discharging pipe 23;

step three, conveying the clinker in the aggregate bin 24 to a ball mill 26 by a screw conveyor 25 for grinding;

step four, conveying the ground clinker into a vibrating screen 27 for screening, conveying the clinker with the qualified fineness into a preparation device 28, returning the clinker with the unqualified fineness into a ball mill 26 for re-grinding, and conveying the clinker into the vibrating screen 27 again for screening until the fineness reaches the standard; the vibrating screen 27 is in the prior art and can screen materials in a grading way, the top of the vibrating screen 27 is provided with a feeding port, screens with different mesh numbers are sequentially arranged in the vibrating screen 27 from top to bottom, and the mesh numbers are gradually increased from top to bottom so as to meet the grading screening requirements of different raw materials on different thickness precision, thereby being beneficial to improving the stability of the expanding agent; the raw materials which do not meet the fineness are returned to the ball mill 26 for grinding again, so that the utilization rate of the raw materials is improved, and the proportioning is more accurate.

Step five, repeating the operation of the rest raw materials according to the step one to the step four in sequence until all the raw materials are ground into powder with the fineness reaching the standard, and conveying the powder into a preparation device 28; according to different performance characteristics of different raw materials, the raw materials are respectively ground into required standard fineness and then mixed and stirred, which is beneficial to improving the stability of the expanding agent.

Step six, starting the preparation device 28 to stir and mix to finally prepare the concrete expanding agent;

and step seven, conveying the concrete expanding agent into the automatic material injection device 29, and quantitatively mixing the concrete expanding agent into the concrete through the automatic material injection device 29. Thereby being beneficial to accurately controlling the proportion of the expanding agent and the cement during mixing and achieving the purposes of good expanding effect and long-term stability.

As shown in fig. 2, the preparation apparatus 28 includes a box 1, an agitator 2 is provided in the box 1, both ends of the agitator 2 are provided with torsion devices 3, the agitator 2 is connected with the box 1 through the torsion devices 3, the top of the agitator 2 is provided with a feed inlet 4, a first electric valve 5 is provided in the feed inlet 4, the bottom of the agitator 2 is provided with a discharge outlet 6, a second electric valve 7 is provided in the discharge outlet 6, the box 1 is provided with a feed pipe 8 corresponding to the feed inlet 4 and a discharge pipe 9 corresponding to the discharge outlet 6, the box 1 is connected with a vibrating screen 27 through the feed pipe 8, and the box 1 is connected with an automatic injection apparatus 29 through the discharge pipe 9.

As shown in fig. 2, the torsion device 3 comprises a universal joint 10 and an eccentric wheel 11, one end of the universal joint 10 is fixedly connected with the end of the stirring barrel 2, the other end of the universal joint 10 is fixedly connected with the eccentric wheel 11, one end of the box body 1 is provided with a servo motor one 12, the servo motor one 12 is installed on the outer side of the box body 1, the servo motor one 12 is provided with an output shaft 13, one end of the output shaft 13 is fixedly connected with the servo motor one 12, the other end of the output shaft 13 penetrates through the side wall of the box body 1 and is positioned in the box body, one of the universal joints 10 is connected with an output shaft 13 through a corresponding eccentric wheel 11 and is located at the bottom of the stirring barrel 2, the other end of the box body 1 is provided with a rotating shaft 14, one end of the rotating shaft 14 is provided with a bearing 15, the rotating shaft 14 is rotatably connected with the inner side wall of the box body 1 through the bearing 15, and the other universal joint 10 is fixedly connected with the other end of the rotating shaft 14 through a corresponding eccentric wheel 11 and is located at the top of the stirring barrel 2.

As shown in fig. 2, a plurality of chains 16 are arranged in the box body 1, one end of each chain 16 is fixedly connected with the top of the box body 1, the other end of each chain 16 is provided with an impact ball 17, the impact balls 17 are fixedly connected with the chains 16, and the length of each chain 16 is greater than the minimum distance from the stirring barrel 2 to the inner side wall of the top of the box body 1 and is smaller than the maximum distance from the stirring barrel 2 to the inner side wall of the top of the box body 1.

As shown in fig. 2, the material inlet 4 and the material outlet 6 are fixedly connected with a soft connecting piece, the material inlet 4 and the material outlet 6 are respectively connected with the inner side wall of the box body 1 in a sliding manner through the corresponding soft connecting pieces, the material inlet 4 is communicated with the inside of the material inlet pipe 8 through the soft connecting pieces, and the material outlet 6 is communicated with the inside of the material outlet pipe 9 through the soft connecting pieces.

As shown in fig. 2, the flexible connecting piece includes a T-shaped sliding block 18 and a flexible connecting pipe 19, a through hole 20 communicated with the interior of the flexible connecting pipe 19 is arranged in the T-shaped sliding block 18, the feed port 4 is fixedly connected with the T-shaped sliding block 18 through the flexible connecting pipe 19 corresponding thereto, the discharge port 6 is fixedly connected with the T-shaped sliding block 18 through the flexible connecting pipe 19 corresponding thereto, the box body 1 is cylindrical, a sound insulation layer is arranged in the side wall of the box body 1, two annular sliding grooves 21 respectively matched with the T-shaped sliding block 18 on the feed port 4 and the T-shaped sliding block 18 on the discharge port 6 are arranged on the inner side wall of the box body 1, the feed pipe 8 is communicated with the interior of one of the annular sliding grooves 21, and.

As shown in fig. 3 and 4, the automatic material injection device 29 includes an outer box 30 and an inner box 31, the inner box 31 is disposed in the outer box 30, a gravity sensor 32 is disposed in the outer box 30, the gravity sensor 32 is mounted at the bottom of the outer box 30 and contacts with the bottom of the inner box 31, a delivery pump 33 is disposed on the discharge pipe 9, one end of the discharge pipe 9 is connected with the box body 1, the other end of the discharge pipe 9 sequentially penetrates through the top of the outer box 30 and the top of the inner box 31 to be disposed in the inner box 31, the discharge pipe 9 is hermetically connected with the outer box 30, a discharge port 34 is disposed at the bottom of the inner box 31, a third electric valve 35 is disposed in the discharge port 34, a material injection port 36 corresponding to the discharge port 34 is disposed at the bottom of the outer box.

As shown in fig. 3 and 4, the flow control device includes an adjusting plate 37 and a second servo motor 38, the adjusting plate 37 is circular, an adjusting hole 39 is formed in the adjusting plate 37, the adjusting hole 39 is located on one side of the adjusting plate 37, the other side of the adjusting plate 37 completely covers the injection port 36, a ring-shaped limiting plate 40 is arranged on the side edge of the adjusting plate 37, the height of the ring-shaped limiting plate 40 is larger than the thickness of the adjusting plate 37, the ring-shaped limiting plate 40 is perpendicular to the adjusting plate 37, the inner side of the ring-shaped limiting plate 40 is fixedly connected with the adjusting plate 37, a plurality of uniformly distributed transmission teeth 41 are arranged on the outer side of the ring-shaped limiting plate 40, a rotation groove 42 is formed in the side wall of the injection port 36, the open end of the rotation groove 42 is matched with the adjusting plate 37, the bottom of the rotation groove 42 is respectively, the rotating cavity 43 is internally provided with a second servo motor 38 which is meshed with the transmission gear 41 and is arranged at the bottom of the outer box 30, and the output end of the second servo motor 38 is connected with the output end of the outer box 30. The bottom thickness of the inner box 31 gradually decreases from the edge to the discharge opening 34.

Principle of operation of the preparation apparatus 28: setting relevant parameters of the servo motor I12; in the initial state, the electric valve I5 and the electric valve II 7 are both in a closed state; opening the electric valve I5, conveying the ground raw materials into the stirring barrel 2 through the feeding pipe 8 for mixing, and closing the electric valve I5; starting a servo motor I12, wherein the servo motor I12 drives one end of the stirring barrel 2 to rotate, so that the stirring barrel 2 makes uniform-speed torsional motion under the action of the eccentric wheels 11 at two ends and the universal joint 10 to uniformly mix the raw materials in the stirring barrel 2, and at the moment, the stirring barrel 2 drives the T-shaped sliding block 18 to slide along the annular sliding chute 21 through the flexible connecting pipe 19; because the raw materials in the stirring barrel 2 are in a dry powder shape, when the stirring barrel 2 works, the powder is easily adsorbed on the inner side wall of the stirring barrel 2, so that when the stirring barrel 2 does uniform-speed torsional motion, the impact ball 17 generates inertia under the action of the chain 16 and continuously impacts the outer side wall of the stirring barrel 2, the outer side wall of the stirring barrel 2 generates oscillation, and the inner side wall of the stirring barrel 2 is favorable for stripping the powder adsorbed on the inner side wall, so that the utilization rate of the raw materials is improved, and the stability of the expanding agent is improved; after the stirring barrel 2 finishes working, the servo motor I12 drives the stirring barrel 2 to return to the original position, so that the position of the feeding hole 4 corresponds to the position of the feeding pipe 8, the position of the discharging hole 6 corresponds to the discharging pipe 9, the expanding agent prepared in the stirring barrel 2 is conveniently discharged from the discharging pipe 9, and meanwhile, the next feeding through the feeding pipe 8 is facilitated; and opening the electric valve II 7, and conveying the configured expanding agent into the automatic material injection device 29 through the discharge pipe 9.

Operating principle of the automatic feeding device 29: when the configured expanding agent is conveyed into the inner box 31 through the discharge pipe 9, the gravity sensor 32 senses the weight of the expanding agent in the inner box, when the weight reaches a set value, the gravity sensor 32 transmits a signal to the control system, and the control system controls and closes the conveying pump 33, so that the total amount of the required expanding agent is accurately controlled; in an initial state, the other side of the adjusting plate 37 completely covers the injection port 36, relevant parameters of the second servo motor 38 are set, and the control system controls the second servo motor 38 to be started, so that automatic injection is realized; when the powder discharging rate or the powder discharging amount of the expanding agent needs to be controlled, the second servo motor 38 drives the adjusting plate 37 to rotate through the gear 44, and the opening size of the injection port 36 is adjusted by adjusting the overlapping degree of the adjusting hole 39 and the injection port 36. The powder discharging rate of the expanding agent is controlled by the flow control device, so that on one hand, the situation that the powder is blown up and sucked into a human body due to the excessively high powder discharging rate, the human health is harmed, and meanwhile, raw materials are wasted is prevented; on the other hand, the amount of the expanding agent mixed in each time can be controlled during the mixing with the concrete.