Preparation device and preparation method of dry-mixed mortar

Abstract

The invention relates to a dry-mixed mortar preparation device and method.The device comprises a coarse crushing structure, a medium crushing structure, a fine crushing structure, a screening structure and a feeding and stirring structure which are sequentially arranged in the material conveying direction, and the coarse crushing structure comprises a box internally provided with a first cavity and a feeding opening formed in the top end of the box; a crushing part capable of rotating relative to the box body is arranged in the first cavity; the intermediate crushing structure comprises a pipe fitting and a crushing part for crushing materials, the pipe fitting is provided with a second cavity communicating with the first cavity and a discharging opening communicating with the second cavity, and the crushing part is arranged in the second cavity; the fine crushing structure comprises a crushing surface for crushing materials, and the crushing surface faces the discharge hole; the screening structure comprises screening holes for distributing machine-made sand from materials; the feeding and stirring structure comprises a shell internally provided with a third part and a stirring assembly arranged in the containing cavity, and the shell is provided with a feeding opening for selectively adding an additive into the machine-made sand in the containing cavity. The input materials are directly processed into the dry-mixed mortar, so that the production efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of recycling construction solid waste materials, and in particular to a preparation device and a preparation method of dry mortar. Background Art

[0002] Dry-mix mortar is mainly made by mixing sieved aggregates (such as quartz sand), cementitious materials (such as cement) and admixtures (such as polymers and water reducers). When used, dry-mix mortar can be made by mixing it with water. There is no need to mix various raw materials on site. It is convenient and environmentally friendly, so it is widely used in construction. However, the raw materials of traditional dry-mix mortar are mainly river sand and cement. Among them, river sand is a non-renewable resource, and excessive mining can easily damage the natural environment; while cement is a high-energy-consuming resource. Its high energy consumption and carbon emissions in the production process consume a large amount of non-renewable resources, which is not conducive to environmental protection and sustainable development. Therefore, using other materials, such as construction solid waste materials, to replace river sand and cement to prepare dry-mix mortar is an effective way to achieve environmental protection and resource conservation.

[0003] Construction solid waste materials, namely construction solid waste, refer to various solid wastes generated during the construction, demolition and decoration of buildings. This type of waste includes concrete blocks, bricks and tiles, mortar, ceramic fragments, metals, wood, plastics and other waste materials. At present, the traditional treatment method of construction solid waste is mainly landfill or stacking, but these treatment methods not only occupy a large amount of land resources, but also seriously damage the ecological environment due to problems such as heavy metal infiltration and dust diffusion in construction solid waste.

[0004] Therefore, the use of construction solid waste materials to prepare dry-mixed mortar not only provides a new type of material for the preparation of dry-mixed mortar, but also completes the recycling and reuse of construction solid waste materials, thereby realizing the recycling of resources and reducing the consumption of natural resources. However, the traditional method is to first use multiple devices and steps to crush and screen the construction solid waste materials to obtain machine-made sand that can be used as the main raw material of dry-mixed mortar, and then use multiple devices and steps to prepare the machine-made sand and other materials into dry-mixed mortar. The efficiency of preparing dry-mixed mortar by traditional methods and equipment is low, and the fluidity and mechanical properties of the cement mortar prepared by the dry-mixed mortar (prepared by the traditional method) cannot meet the use requirements. Summary of the invention

[0005] Based on this, it is necessary to provide a preparation device and a preparation method that can improve the preparation efficiency of dry mortar.

[0006] A preparation device for dry mortar, comprising:

[0007] A coarse crushing structure, the coarse crushing structure comprises a box body with a first cavity inside, a feeding port connected to the first cavity is provided at the top of the box body, a crushing member that can rotate relative to the box body is provided in the first cavity, and the crushing member is used to perform preliminary crushing of the material;

[0008] a secondary crushing structure, arranged downstream of the coarse crushing structure along the transport direction of the material, the secondary crushing structure comprising a pipe and a crushing member for crushing the material, the pipe having a second cavity connected to the first cavity and a discharge port connected to the second cavity, the crushing member being arranged in the second cavity;

[0009] A fine crushing structure is arranged downstream of the medium crushing structure along the transport direction of the material, the fine crushing structure comprises a crushing surface for crushing the material, the crushing surface faces the discharge port;

[0010] A screening structure is arranged downstream of the fine crushing structure along the transport direction of the material, the screening structure comprising screen holes, and the screen holes are used to separate machine-made sand from the material;

[0011] The feeding and stirring structure is arranged downstream of the screening structure. The feeding and stirring structure comprises a shell with a cavity inside and a stirring component arranged in the cavity. The shell is provided with a feeding port for selectively adding additives to the machine-made sand in the cavity.

[0012] In one embodiment, the coarse crushing structure is located above the medium crushing structure, and the preparation device also includes a funnel-shaped guide hopper and a shaking piece arranged on the outer peripheral side of the guide hopper, the guide hopper is located between the coarse crushing structure and the medium crushing structure, and the upper end of the guide hopper is connected to the box body of the coarse crushing structure through a flexible connecting frame, the lower end of the guide hopper is connected to the pipe fitting of the medium crushing structure, and the guide hopper has a guide channel connecting the first cavity and the second cavity; the shaking piece is used to shake the guide hopper.

[0013] In one embodiment, the flexible connection frame includes a flexible connection layer and a rigid frame arranged inside the connection layer. There are at least two rigid frames, which are arranged in sequence and spaced apart.

[0014] In one embodiment, the crushing member includes a spiral rod coaxially arranged with the tube and spiral blades arranged on the outer peripheral wall of the spiral rod. The spiral rod can rotate along its own axis and drive the spiral blades to rotate synchronously.

[0015] In one embodiment, the pipe fitting includes a guide pipe and an accelerating pipe connected end to end in sequence, and a feed pipe connected to the guide channel of the guide hopper is provided on the outer peripheral wall of the guide pipe; the intermediate crushing structure also includes an air delivery component for increasing the material transportation speed, and the air delivery component includes an air pump and a main air pipe and an auxiliary air pipe both connected to the air pump, the main air pipe is provided at the end of the guide pipe away from the accelerating pipe and connected to the guide pipe; the auxiliary air pipe is provided on the outer peripheral wall of the accelerating pipe and connected to the accelerating pipe;

[0016] The accelerating tube is a Venturi tube, and the inner wall of the expansion section of the accelerating tube has a tungsten carbide coating with a surface roughness Ra of 0.4 μm≤Ra≤1.6 μm.

[0017] In one embodiment, the open end of the pipe is the discharge port; the crushing structure includes a support plate arranged opposite to the discharge port, the crushing surface includes a first plate surface of the support plate facing the discharge port and a convex portion protruding from the first plate surface, the first plate surface is inclined, and the inclination direction of the first plate surface forms an angle α with the axial direction of the pipe, and the angle α satisfies: 25°≤α≤35°.

[0018] In one embodiment, the convex portion is a tungsten steel protrusion extending toward the pipe fitting, the tungsten steel protrusions are multiple and arranged at intervals, the spacing between any two adjacent tungsten steel protrusions is 40 mm to 60 mm, the length of the tungsten steel protrusion is 15 mm to 25 mm, and the angle between the extension direction of the tungsten steel protrusion and the axial direction of the pipe fitting is β, and the angle β satisfies: 55°≤β≤65°;

[0019] And / or, a top edge and / or a side edge of the support plate is provided with a protective plate extending toward the pipe fitting.

[0020] In one embodiment, the screening structure is a vibrating screen, the screen holes are arranged on the vibrating screen, and the aperture of the screen holes is 2 mm to 5 mm;

[0021] And / or, the preparation device further comprises a conveying structure located between the screening structure and the spraying and stirring structure, the conveying structure comprising a first conveying channel for conveying the machine-made sand to the spraying and stirring structure and a second conveying channel for conveying part of the material except the machine-made sand to the coarse crushing structure;

[0022] And / or, the preparation device also includes a dust removal structure, which includes a dust collecting part for collecting and storing dust and a driving part for allowing dust to enter the dust collecting part, the dust collecting part is provided with a first dust suction port and a second dust suction port, a gap is left between the discharge port of the medium crushing structure and the fine crushing structure, the first dust suction port is located above the gap and is connected to the gap, and the second dust suction port is located above the feed port and is connected to the feed port.

[0023] The present application also provides a method for preparing dry-mix mortar, which uses the preparation device described in any of the above embodiments to prepare dry-mix mortar, and the preparation method comprises:

[0024] Pre-treating the material so that the particle size of the material is less than or equal to 800 mm;

[0025] The material is fed into the coarse crushing structure, and the crushing elements of the coarse crushing structure preliminarily crush the material;

[0026] The intermediate crushing structure crushes the material again;

[0027] The material impacts the crushing surface of the fine crushing structure from the discharge port of the medium crushing structure at a certain speed to be crushed three times, and then falls into the screening structure;

[0028] The screening structure separates machine-made sand that meets the particle size requirements from the material that has been crushed three times;

[0029] The separated machine-made sand is transported to the feeding and stirring structure. Optionally, the feeding and stirring structure stirs the machine-made sand, and optionally, additives are added to the machine-made sand.

[0030] In one embodiment, the additive is a modified polycarboxylate water reducer, and the preparation method of the modified polycarboxylate water reducer is:

[0031] mixing a polyether macromonomer with hydrogen peroxide in deionized water to obtain a mixture I;

[0032] Add acrylic acid and ammonium persulfate to ionized water to obtain liquid A;

[0033] Add L-ascorbic acid and mercaptopropionic acid to deionized water to obtain solution B;

[0034] Mixing the organosilicon monomer and the ethanol solution to form liquid C;

[0035] Synchronously adding the liquid A and the liquid B dropwise into the mixture I to obtain a mixture II;

[0036] Add the liquid C into the mixture II, heat and stir;

[0037] After cooling, the modified polycarboxylic acid water-reducing agent is obtained.

[0038] Compared with the prior art, the preparation device of dry-mixed mortar provided by the present application can perform preliminary crushing, secondary crushing and tertiary crushing on the added materials in sequence. The screening structure in the preparation device can also divert the machine-made sand from the material after the tertiary crushing, and transport the diverted machine-made sand to the feeding and stirring structure. The feeding and stirring structure can selectively add additives to the machine-made sand while stirring the machine-made sand, so as to obtain the finished dry-mixed mortar. In this way, the preparation device can directly add the input materials to the finished dry-mixed mortar, thereby improving the production efficiency. In addition, the screening structure can only transport the machine-made sand that meets the particle size requirements to the downstream feeding and stirring structure, which improves the particle size uniformity of the finished dry-mixed mortar, thereby improving the quality of the finished dry-mixed mortar. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 A three-dimensional diagram of a preparation device according to an embodiment of the present application;

[0041] Figure 2 A schematic diagram of a guide structure according to an embodiment of the present application;

[0042] Figure 3 A schematic diagram of a medium crushing structure according to an embodiment of the present application;

[0043] Figure 4 A schematic diagram of a fragmented structure according to an embodiment of the present application;

[0044] Figure 5 It is a schematic diagram of a crushing surface and a pipe in one embodiment of the present application.

[0045] Figure numerals: 1. workbench; 2. support frame; 3. coarse crushing structure; 31. crushing part; 4. guide structure; 41. guide hopper; 42. shaking part; 43. flexible connecting frame; 44. output pipe; 45. flexible conducting pipe; 5. medium crushing structure; 51. guide pipe; 52. acceleration pipe; 53. main air pipe; 54. auxiliary air pipe; 55. feed pipe; 56. support table; 6. fine crushing structure; 61. crushing surface; 611. tungsten steel bump; 62. support plate; 63. protective plate; 64. docking plate; 65. finished product outlet; 7. screening structure; 71. sieve hole; 81. first conveying channel. DETAILED DESCRIPTION

[0046] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0047] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0048] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0049] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above”, or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0050] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0051] See also Figures 1 to 5 The present application provides a device for preparing dry mortar, comprising:

[0052] The coarse crushing structure 3 includes a box body with a first cavity inside, a feeding port connected to the first cavity is provided at the top of the box body, and a crushing member 31 that can rotate relative to the box body is provided in the first cavity, and the crushing member 31 is used for preliminary crushing of the material;

[0053] The intermediate crushing structure 5 for crushing the material again is arranged downstream of the coarse crushing structure 3 along the material transportation direction. The intermediate crushing structure 5 includes a pipe and a crushing member for crushing the material. The pipe has a second cavity connected to the first cavity and a discharge port connected to the second cavity. The crushing member is arranged in the second cavity.

[0054] The fine crushing structure 6 is arranged downstream of the medium crushing structure 5 along the material transport direction. The fine crushing structure 6 includes a crushing surface 61 for crushing the material. The crushing surface 61 faces the discharge port. When the material leaves the medium crushing structure 5 from the discharge port at a certain speed, it can hit the crushing surface 61 to be crushed three times.

[0055] The screening structure 7 is arranged downstream of the fine crushing structure 6 along the material transport direction. The screening structure 7 includes a screen hole 71. The screen hole 71 is used to separate the machine-made sand from the material.

[0056] The feeding and stirring structure is arranged downstream of the screening structure 7 along the material transportation direction. The feeding and stirring structure includes a shell with a cavity inside and a stirring component arranged in the cavity. The shell is provided with a feeding port for selectively adding additives to the machine-made sand in the cavity.

[0057] It can be understood that after the dry-mixed mortar preparation device provided in this embodiment performs preliminary crushing, secondary crushing and tertiary crushing on the added materials in sequence, the screening structure 7 in the preparation device can also separate the machine-made sand from the materials after the tertiary crushing, and transport the separated machine-made sand to the feeding and stirring structure. The feeding and stirring structure can selectively add additives to the machine-made sand while stirring the machine-made sand, so as to obtain the finished dry-mixed mortar. In this way, the preparation device can directly process the input materials into the finished dry-mixed mortar, thereby improving the production efficiency.

[0058] Schematically, after the diverted machine-made sand is transported to the feeding and mixing structure, the feeding and mixing structure can add additives to the machine-made sand in a certain proportion according to the pre-set settings, and obtain the finished dry mortar after mixing. Specifically, the additives can be cementitious materials such as water reducer, cement, fly ash, etc., and the additive addition ratio is 0.1%. In other embodiments, the additives can be selected in different types and proportions according to the requirements for the dry mortar.

[0059] In addition, since only materials that meet the particle size requirements can pass through the sieve holes 71 in the screening structure 7, that is, the screening structure 7 diverts the machine-made sand from the materials that have been crushed three times by the coarse crushing structure, the medium crushing structure, and the fine crushing structure, the remaining materials that do not meet the particle size requirements are retained in the screening structure 7 because they cannot pass through the sieve holes 71, and are then returned to the coarse crushing structure for secondary processing, and will not be transported to the downstream feeding and mixing structure. Only the machine-made sand that meets the particle size requirements will be transported to the downstream feeding and mixing structure, thereby improving the particle size uniformity of the finished dry mortar and improving the quality of the finished dry mortar.

[0060] Specifically, the crushing parts 31 in the coarse crushing structure 3 are two sets of independently driven rollers, and the two sets of rollers are arranged in parallel along the length direction or width direction of the box body, and rotate synchronously in opposite directions through the drive of the hydraulic power system. When construction solid waste enters the first cavity of the box body from the feed port as material, the material is forced to be squeezed and crushed by the meshing force of the two sets of rotating rollers. The material with a particle size smaller than the roller gap diameter can move downstream from the roller gap, and the material with an oversized particle size is subjected to secondary crushing after the roller pressure is briefly released until it is crushed into a particle size smaller than the roller gap diameter. In this embodiment, the two sets of rollers are arranged in parallel along the length direction of the box body to increase the working space of the two sets of rollers and improve the crushing efficiency. In other embodiments, the two sets of rollers can also be arranged in parallel along the width direction of the box body, and the present application does not limit this.

[0061] Schematically, by adjusting the spacing between the rollers, the material can be crushed into medium-sized particles with a particle size of 15 to 40 mm.

[0062] Schematically, the coarse crushing structure 3 is located above the medium crushing structure 5, that is, the material after preliminary crushing is transported downstream under the action of gravity, which can save the energy required for the preparation equipment, make full use of the height space, and reduce the volume of the preparation device.

[0063] Specifically, the feeding and mixing structure can add the required additives or not add the additives according to the requirements for the dry-mixed mortar to be produced, so as to improve the diversity of the dry-mixed mortar that can be produced by the preparation device and improve the universality of the preparation device.

[0064] In one embodiment, see Figure 2The preparation device also includes a guide structure 4 which is a funnel-shaped structure as a whole. The guide structure 4 includes a funnel-shaped guide hopper 41 and a shaking member 42 arranged on the outer peripheral side of the guide hopper 41 for shaking the guide hopper 41. The guide hopper 41 is located between the coarse crushing structure 3 and the medium crushing structure 5, and the upper end of the guide hopper 41 is connected to the box of the coarse crushing structure 3 through a flexible connection frame 43, and the lower end of the guide hopper 41 is connected to the pipe of the medium crushing structure 5, and the guide hopper 41 has a guide channel connecting the first cavity and the second cavity. In this way, the flexible sealing and vibration guide of the guide hopper 41 in the circumferential direction can avoid blockage caused by adhesion or accumulation of materials during transportation. This makes the preparation device in this embodiment more suitable for construction solid waste materials containing sticky impurities. In addition, the upper end of the guide hopper 41 is connected to the box of the coarse crushing structure 3 through a flexible connection frame 43, which can prevent the guide hopper 41 from driving the coarse crushing structure 3 when shaking, and can prevent the coarse crushing structure 3 from vibrating or collapsing, thereby improving the safety of the preparation device. Compared with the open guide hopper 41 and the coarse crushing structure 3 without the flexible connection frame 43, the flexible connection frame 43 can also directly prevent the dust in the material from spilling out, thereby improving the working environment.

[0065] Specifically, the bottom of the guide hopper 41 is provided with an inclined surface with an inclination angle of 40° to 50° to assist the initially crushed materials to move downstream. The guide hopper 41 is made of steel to improve the mechanical rigidity and wear resistance of the guide hopper 41 .

[0066] Specifically, the shaking structure includes a first motor and two sets of electric push rods with a stroke of 200 mm and a frequency of 10 Hz. The electric push rods can drive the guide hopper 41 to vibrate periodically under the driving force of the first motor. Furthermore, the preparation device also includes a support frame 2 arranged on the outer peripheral side of the guide structure 4, and the two ends of the electric push rod in the shaking structure are fixedly mounted on the outer peripheral sides of the support frame 2 and the guide hopper 41, respectively.

[0067] Furthermore, the flexible connection frame 43 includes a flexible connection layer and a rigid frame arranged inside the connection layer. There are at least two rigid frames, which are arranged in sequence. It can be understood that since the guide hopper 41 can shake, the coarse crushing structure 3 should reduce the probability of shaking to improve the safety of the preparation device. Semi-enclosed road Compared with the open guide hopper 41 and the coarse crushing structure 3 without the flexible connection frame 43, the flexible connection frame 43 can directly block the dust overflow path. When the guide hopper 41 shakes under the action of the shaking member 42, the connection layer is elastically deformed to compensate the displacement deviation between the guide hopper 41 and the coarse crushing structure 3 in real time, thus avoiding the coarse crushing structure 3 from shaking due to the shaking of the guide hopper 41, and reducing the diffusion of dust from the coarse crushing structure 3 and the guide hopper 41, thereby improving the working environment.

[0068] Specifically, the rigid frame includes a rectangular steel metal frame, and the steel metal frames are connected by steel wires to increase the stability and strength of the rigid frame. Schematically, multiple steel metal frames are arranged in sequence along the vertical direction. In other embodiments, multiple steel metal frames can also be arranged in sequence along the circumference of the guide hopper 41. This application does not limit this.

[0069] Specifically, the connecting layer may be a canvas layer, and the canvas layer is coated with a dust-repellent coating on the side facing the guide channel. This not only improves the wear resistance of the connecting layer and extends its service life, but also facilitates the dust removal effect of the dust removal structure.

[0070] Furthermore, the guide structure 4 also includes an output pipe 44 and a flexible conduction pipe 45 connected in sequence along the vertical direction, and the output pipe 44 and the flexible conduction pipe 45 are connected, and the output pipe 44 is fixedly connected to the bottom of the guide hopper 41, and is connected to the first cavity through the guide hopper 41. The flexible conduction port is fixedly connected to the bottom of the output pipe 44, and is connected to the feed pipe 55 of the intermediate crushing structure 5, and is connected to the second cavity. In this way, the first cavity and the second cavity are connected through the guide structure 4, so that the material is transported between the circumferentially closed guide structures 4, which prevents the dust in the material from escaping during the transportation process, and is more conducive to the subsequent collection of dust.

[0071] Specifically, the flexible conducting port adopts a circular steel frame wrapped with a canvas layer, and is sealed and connected to the feed pipe 55 of the intermediate crushing structure 5 through a flange, so that the intermediate crushing structure 5 can be prevented from shaking due to the shaking of the guide hopper 41.

[0072] In one embodiment, the crushing element in the intermediate crushing structure 5 includes a spiral rod coaxially arranged with the pipe and spiral blades arranged on the outer peripheral wall of the spiral rod, and the spiral rod can rotate along its own axis and drive the spiral blades to rotate synchronously. In this way, the crushing element can crush the material again while transporting the material.

[0073] It is understandable that the intermediate crushing structure 5 also includes a second motor, and the output shaft of the second motor is connected to the spiral rod, thereby driving the spiral rod to rotate along its own axis. The spiral blade is designed to be right-handed with a fixed pitch, and the spiral blade rotates from the feed pipe 55 to the discharge port. When the second motor drives the spiral rod to rotate, the spiral blade and the material contact surface generate an axial component force, which pushes the material to move toward the discharge port at a certain rate, forming a continuous conveying flow, so that the material can be transported from the feed pipe 55 to the discharge port. Due to the small gap between the edge of the rotating blade and the inner wall of the pipe, the material will be squeezed between the rotating blade and the inner wall of the pipe during the conveying process, generating shear force, resulting in the re-crushing of the material. When the material is conveyed by the crusher, the material will collide with the rotating blade, and the materials will also be squeezed and rubbed against each other, which can cause the material to be crushed into smaller particles again.

[0074] In one embodiment, see Figure 3 The pipe fittings include a guide pipe 51, and a feed pipe 55 connected to the guide channel of the guide hopper 41 is provided on the outer peripheral wall of the guide pipe 51. In this way, the arrangement of the guide pipe 51 is not limited by the site, the total height of the device is reduced, and the universality of the medium crushing structure 5 is improved. Specifically, the feed pipe 55 is connected to the guide channel of the guide hopper 41 through the flexible guide pipe 45, the output pipe 44, and the guide channel.

[0075] Furthermore, the pipe fittings also include an accelerating tube 52 connected to the guide tube 51 end to end. The intermediate crushing structure 5 also includes an air delivery assembly for increasing the material transportation speed, the air delivery assembly includes an air pump and a main air pipe 53 and an auxiliary air pipe 54 both connected to the air pump, the main air pipe 53 is arranged at the end of the guide tube 51 away from the accelerating tube 52, and is connected to the guide tube 51; the auxiliary air pipe 54 is arranged on the outer peripheral wall of the accelerating tube 52, and is connected to the accelerating tube 52. The air delivery assembly can provide auxiliary power for conveying the materials in the guide tube 51 and the accelerating tube 52, accelerate the materials, disturb the materials in the guide tube 51 and the accelerating tube 52, and make the materials collide with each other, collide with the rotating blades, and collide with the inner walls of the guide tube 51 and the accelerating tube 52 at a certain speed, so that it is more conducive to the re-crushing of the materials, so that the particle size of the materials after re-crushing can be between 5mm and 15mm. In addition, the gas delivery component can also make the material leave the discharge port at a certain speed, so that it can hit the crushing surface 61 of the fine crushing structure 6 at a certain speed, which is beneficial to the third crushing of the material.

[0076] Specifically, the working air pressure of the air pump is 0.8MPa to 1.2MPa, and the air flow velocity is 50m / s to 80m / s, so as to ensure the effect of re-crushing the material, so that the particle size of the material after re-crushing can be between 5mm and 15mm.

[0077] Furthermore, the portion of the auxiliary air pipe 54 close to the accelerating tube 52 is an inclined section, and the axial direction of the inclined section is arranged to intersect with the axial direction of the accelerating tube 52. That is to say, the auxiliary air pipe 54 obliquely supplements the air flow into the accelerating tube 52 through the inclined section. In this way, the movement trajectory of the material in the accelerating tube 52 can be optimized to ensure that the material is evenly impacted onto the crushing surface 61.

[0078] Furthermore, the preparation device also includes a pressure feedback module for real-time detection of the pressure of the air pump when it is working, and dynamically adjusting the working air pressure of the air pump according to the detected pressure to ensure that the device operates under an appropriate pressure state.

[0079] In one embodiment, the accelerating tube 52 is a Venturi tube, and the accelerating tube 52 includes an inlet section, a contraction section, a throat section, and an expansion section along the material transportation direction. It can be understood that the Venturi tube accelerates the flow of the gas supplemented by the air pump in the accelerating tube 52 by contracting the cross-sectional area of ​​the accelerating tube 52. The velocity of the fluid at the throat section is the highest and the pressure is the lowest, and a pressure difference is generated between the inside and outside of the material, causing the material to rupture due to the imbalance of the internal and external pressures. In addition, due to the Venturi effect in the accelerating tube 52, the rotating blades in the accelerating tube 52 can be assisted in crushing the material. When the gas carries or impacts the material, the impact force generated by the high-speed flow can directly crush the material, thereby helping to improve the effect of secondary crushing of the material.

[0080] It can be understood that, for the accelerating tube 52 connected to the guide tube 51, the inlet section of the accelerating tube 52 is connected to the guide tube 51. Specifically, the diameter of the throat of the accelerating tube 52 is 80 mm, and the expansion angle of the expansion section is 15°.

[0081] Furthermore, the inner wall of the expansion section of the accelerating tube 52 has a tungsten carbide coating with a surface roughness Ra of 0.4μm≤Ra≤1.6μm. In this way, the collision and friction between the tungsten carbide coating and the material increase the effect of re-crushing the material, refine the particle size of the material, and extend the life of the accelerating tube 52 and reduce maintenance costs. Schematically, the surface roughness Ra of the tungsten carbide coating is 0.4μm, 0.5μm, 0.6μm, 0.7μm, 0.8μm, 0.9μm, 1.0μm, 1.1μm, 1.2μm, 1.3μm, 1.4μm, 1.5μm, 1.6μm, or any other value within the range of 0.4μm≤Ra≤1.6μm.

[0082] Specifically, the thickness of the tungsten carbide coating is 0.3 mm to 0.5 mm. In this way, the tungsten carbide coating can effectively resist the impact caused by friction and materials, prolong the life of the components, and save the manufacturing cost and processing feasibility of the tungsten carbide coating.

[0083] Furthermore, there are multiple accelerating tubes 52, and the multiple accelerating tubes 52 are connected end to end in sequence to improve the flexibility and personalization of the preparation device. It is understood that in the opposite direction of the material transportation direction, for two adjacent accelerating tubes 52, the inlet pipe of the accelerating tube 52 is connected to the expansion section of the adjacent accelerating tube 52. It is also understood that the open end of the accelerating tube 52 in the pipe is the above-mentioned discharge port.

[0084] In one embodiment, see Figure 4 and Figure 5The fine crushing structure 6 includes a support plate 62 arranged opposite to the discharge port, and the crushing surface 61 includes a first plate surface of the support plate 62 facing the discharge port and a convex portion convexly arranged on the first plate surface. The first plate surface is inclined, and the inclination direction of the first plate surface forms an angle α with the axial direction of the pipe fitting, and the angle α satisfies: 25°≤α≤35°. In this way, the material leaving the discharge port of the pipe fitting at a certain speed can hit the crushing surface 61 at an angle α, and the material will not rebound in the direction of the discharge port of the pipe fitting after hitting the crushing surface 61, which is conducive to the material continuing to be transported downstream. And the angle α is between 25° and 35°, which can avoid the insufficient impact force of the material on the crushing surface 61 due to the angle α being too small, and can also avoid the material hitting the crushing surface 61 and then hitting the pipe fitting due to the angle α being too large, so that the material can hit the crushing surface 61 with a certain impact force, and after hitting the crushing surface 61, it can also be transported downstream from the finished product outlet 65.

[0085] Illustratively, the angle α between the inclined direction of the first plate surface and the axial direction of the tube is 25°, 27°, 29°, 31°, 33°, 35°, or any other value within the range of 25°≤α≤35°.

[0086] Furthermore, there is a gap between the support plate 62 and the pipe fitting, and the material after hitting the crushing surface 61 will rebound to the gap, thereby continuing to be transported downstream. Schematically, the preparation device also includes a workbench 1, and the pipe fitting is arranged on the workbench 1, that is, the axial direction of the pipe fitting is the same as the extension direction of the workbench 1. The fine crushing structure 6 also includes a docking plate 64 connected to the workbench 1, and the support plate 62 is connected to the end of the docking plate 64 away from the workbench 1, and a finished product outlet 65 is provided on the docking plate 64, that is, in the axial direction of the pipe fitting, the workbench 1 and the support plate 62 are respectively connected to the two sides of the finished product outlet 65. In the direction perpendicular to the axial direction of the pipe fitting, since the support plate 62 is inclined relative to the axial direction of the pipe fitting, after the material hits the crushing surface 61 from the outlet of the pipe fitting, it will pass through the finished product outlet 65 and continue to move downstream.

[0087] In this embodiment, a support platform 56 for supporting the pipe is further provided on the workbench 1 to fix the position of the pipe and prevent the pipe from moving.

[0088] In one embodiment, a protective plate 63 extending toward the pipe is provided at the top edge and / or the side edge of the support plate 62. In this way, the material can be prevented from splashing around from the crushing surface 61, ensuring that the material only moves toward the finished product outlet 65.

[0089] In one embodiment, see Figure 5The convex part is a tungsten steel bump 611 extending toward the pipe fitting. There are multiple tungsten steel bumps 611 arranged at intervals. The spacing between any two adjacent tungsten steel bumps 611 is 40mm to 60mm. The length of the tungsten steel bump 611 is 15mm to 25mm. The angle between the extension direction of the tungsten steel bump 611 and the axial direction of the pipe fitting is β, and the angle β satisfies: 55°≤β≤65°. In this way, the convex part can improve the crushing effect of the crushing surface 61 on the material. Specifically, the particle size of the material can be accurately controlled by adjusting the spacing and angle β between the tungsten steel bumps 611 on the crushing surface 61, thereby meeting the production needs of different particle size requirements.

[0090] Schematically, the spacing between any two adjacent tungsten steel bumps 611 is 40mm, 45mm, 50mm, 55mm, 60mm, or any other value in the range of 40mm to 60mm. Schematically, the length of the tungsten steel bump 611 is 15mm, 17mm, 19mm, 21mm, 23mm, 25mm, or any other value in the range of 15mm to 25mm. Schematically, the angle β between the extension direction of the tungsten steel bump 611 and the axial direction of the pipe is 55°, 57°, 59°, 61°, 63°, 65°, or any other value in the range of 55°≤β≤65°.

[0091] In one embodiment, the screening structure 7 is a vibrating screen, and the screen hole 71 is provided in the vibrating screen, and the aperture of the screen hole 71 is 2 mm to 5 mm. It can be understood that after the material after the three crushings enters the vibrating screen, the part of the material that can pass through the screen hole 71 of the vibrating screen is the machine-made sand that meets the particle size requirements, and the part of the material that cannot pass through the screen hole 71 of the screening structure is the part of the material other than the machine-made sand, which will be left in the screening structure 7, so that the vibrating screen can screen and divert the machine-made sand that meets the particle size requirements from the material after the three crushings.

[0092] Furthermore, along the material transportation direction, the preparation device also includes a conveying structure located between the screening structure 7 and the spray stirring structure, and the conveying structure includes a first conveying channel 81 for conveying the machine-made sand diverted from the screening structure to the spray stirring structure and a second conveying channel for conveying part of the material other than the machine-made sand to the coarse crushing structure 3. It can be understood that the first conveying channel 81 directly conveys the machine-made sand to the feeding and stirring structure located downstream, so that the construction solid waste materials put into the preparation device can be processed into dry mortar that meets the requirements in one step, thereby improving production efficiency. And the first conveying channel 81 can only convey the machine-made sand to the feeding and stirring structure downstream, thereby improving the particle size uniformity of the finished dry mortar, and thus improving the quality of the finished dry mortar. In addition, the second conveying channel returns part of the material other than the machine-made sand to the coarse crushing structure 3 for re-crushing, thereby avoiding the waste of construction solid waste materials and improving the utilization rate of construction solid waste materials.

[0093] Schematically, some of the materials other than the manufactured sand remaining on the screening structure can be transferred to the second conveying channel in the form of shaking and vibration, or some of the materials other than the manufactured sand remaining on the screening structure can be regularly turned over to the second conveying channel, and then sent back to the coarse crushing structure 3 by the second conveying channel.

[0094] In one embodiment, the preparation device further includes a dust removal structure, which includes a dust collecting member for collecting and storing dust and a driving member for allowing dust to enter the dust collecting member. The dust collecting member is provided with a first dust suction port and a second dust suction port. A gap is left between the discharge port of the medium crushing structure and the fine crushing structure. The first dust suction port is located above the gap and communicated with the gap. The second dust suction port is located above the feed port and communicated with the feed port. In this way, dust generated during the material crushing process can be collected, dust emission can be reduced, the construction environment can be improved, and environmental pollution can be avoided.

[0095] The present application also proposes a method for preparing dry-mix mortar, using the preparation device in any of the above embodiments to prepare dry-mix mortar, the preparation method comprising:

[0096] S1: Pre-treat the material so that the particle size of the material is less than or equal to 800mm.

[0097] Specifically, the pretreatment method is: sorting and removing impurities from construction solid waste materials (concrete blocks, bricks and tiles, etc.), and pre-crushing them with a jaw crusher to crush the particle size of the raw materials to below 800 mm, so as to improve the crushing efficiency of the preparation device for the materials and the production efficiency of the dry mortar.

[0098] S2: The material is put into the coarse crushing structure 3, and the crushing elements 31 in the coarse crushing structure 3 perform preliminary crushing on the material.

[0099] Specifically, the crushing element 31 in the coarse crushing structure 3 can initially crush the material into material with a particle size of 15 mm to 40 mm, and the dust removal structure is simultaneously activated to reduce dust emission.

[0100] S3: The secondary crushing structure 5 crushes the material after the primary crushing again.

[0101] Specifically, the crushing parts in the intermediate crushing structure 5 can crush the material into materials with a particle size of 5mm to 15mm. The dust removal structure is activated simultaneously to reduce dust emissions. At the same time, the air pump accelerates the material in the intermediate crushing structure 5 to accumulate power for the third crushing of the material.

[0102] S4: The material hits the crushing surface 61 of the fine crushing structure 6 from the discharge port of the medium crushing structure 5 at a certain speed to be crushed three times, and then falls into the screening structure.

[0103] Specifically, the material can be crushed into machine-made sand that meets the particle size requirements by adjusting the roughness on the crushing surface 61. Furthermore, the particle size of the material can be precisely adjusted by adjusting the spacing between the tungsten steel bumps 611 on the crushing surface 61 and the angle β between the extension direction of the tungsten steel bumps 611 and the axial direction of the pipe fitting, thereby meeting the production needs of different particle size requirements. The dust removal structure is also enabled simultaneously to reduce dust emissions.

[0104] S5: The screening structure separates the machine-made sand that meets the particle size requirements from the material that has undergone tertiary crushing.

[0105] Specifically, the sieve holes 71 on the screening structure 7 can separate the machine-made sand that meets the particle size requirements and some materials that do not meet the particle size requirements from the materials that have undergone the third crushing.

[0106] In other embodiments, the diverted machine-made sand can be transported to a sealed finished product storage bin via a conveyor belt, or can be directly packaged for sale or use.

[0107] S6: conveying the diverted machine-made sand to a feeding and stirring structure. Optionally, the feeding and stirring structure stirs the machine-made sand, and optionally, an additive is added to the machine-made sand.

[0108] It should be noted that, depending on the dry-mixed mortar produced, the feeding and stirring structure may be configured to feed additives into the machine-made sand therein or not. Furthermore, when additives need to be added to the machine-made sand, the feeding and stirring structure may be configured to feed the required additives depending on the dry-mixed mortar produced.

[0109] In one embodiment, the additive is a modified polycarboxylate water reducer, and the preparation method of the modified polycarboxylate water reducer is:

[0110] (1) Mixing a polyether macromonomer and hydrogen peroxide in deionized water to obtain a mixture I.

[0111] Preferably, 80 to 120 parts by weight of a polyether macromonomer and 40 to 60 parts by weight of hydrogen peroxide are mixed in 150 parts by weight of water, and reacted at 30 to 35° C. and 300 rpm for 30 minutes to obtain a mixture I.

[0112] (2) Add acrylic acid (carboxylic acid) and ammonium persulfate to ionized water to obtain liquid A.

[0113] Preferably, 10 to 20 parts by weight of acrylic acid and 12 to 30 parts by weight of ammonium persulfate are added to 50 parts by weight of deionized water, and the mixture is stirred at 150 rpm for 10 minutes to obtain solution A.

[0114] (3) Add L-ascorbic acid and mercaptopropionic acid to deionized water to obtain solution B.

[0115] Preferably, 10 to 13 parts by weight of L-ascorbic acid and 35 to 45 parts by weight of mercaptopropionic acid are added to 50 parts by weight of deionized water, and the mixture is mixed at 150 rpm for 10 minutes to obtain solution B.

[0116] (4) The organosilicon monomer and the ethanol solution are mixed to form liquid C.

[0117] Preferably, 90 to 110 parts by weight of the organosilicon monomer and 70 parts by weight of the ethanol solution are mixed to form liquid C.

[0118] (5) Liquid A and Liquid B are simultaneously added dropwise to mixture I to obtain mixture II.

[0119] Preferably, liquid A and liquid B are simultaneously added dropwise to mixture I at a rate of 0.1 to 0.5 mL / min, and reacted at 60±2° C. and 300 rpm for 4 to 6 hours. Stirring is stopped when the viscosity coefficient is 500 to 700 mPa·s using a rotational viscometer to obtain mixture II.

[0120] (6) Add liquid C to mixture II, heat and stir.

[0121] Preferably, liquid C is added to mixture II, and the mixture is stirred for 2 hours under heating conditions to complete the grafting modification process.

[0122] (7) After cooling, a modified polycarboxylic acid water-reducing agent is obtained.

[0123] Preferably, the reaction product in step (6) is dialyzed with deionized water for 72 hours, cooled to room temperature, filtered and dried in a vacuum drying oven for 24 hours to obtain a modified polycarboxylic acid water-reducing agent.

[0124] In one embodiment, the preparation method of the dry-mix mortar further comprises: performing quality inspection on the dry-mix mortar. Preferably, the dry-mix mortar is inspected for particle size, powder content, fluidity and other indicators to ensure that it meets relevant standards and requirements.

[0125] The modified polycarboxylate water reducer in this embodiment is prepared by a free radical grafting method, combining an organosilicon monomer with a polycarboxylic acid main chain to form a hydrophobic-hydrophilic bifunctional group to increase the grafting rate; in addition, the thiol propionic acid chain transfer agent is optimized and its molecular weight distribution is controlled to ensure the dispersion stability of the water reducer. Through the synergistic effect of the modified polycarboxylate water reducer, the dry-mixed mortar prepared by the preparation method in this embodiment can reduce the water-cement ratio of concrete and machine-made sand mortar to a certain extent, thereby reducing the amount of water used, and the water reduction rate is increased to 25% to 30%, and the water-cement ratio is reduced by 15% to 20%, so that the fluidity and plasticity of concrete and machine-made sand mortar are improved, and the construction performance is improved.

[0126] The modified polycarboxylate water-reducing agent in this embodiment can effectively disperse cement particles, reduce the aggregation and flocculation between particles, make the particle distribution more uniform, and facilitate the full progress of the hydration reaction. The lower water-cement ratio makes the concrete more compact, reduces the porosity, and thus improves the strength. The 28-day compressive strength of the dry-mixed mortar is ≥45MPa, and the chloride ion permeability resistance is increased by 30%, which means that the quality of the product is improved.

[0127] In addition, after adding modified polycarboxylic acid water-reducing agent, the fluidity and plasticity of concrete and machine-made sand mortar are improved, making it easier to construct, vibrate and fill, reducing the formation of voids and bubbles and improving surface smoothness and density.

[0128] In summary, compared with the prior art, the present application systematically solves the problems of low processing efficiency, heavy pollution, and poor performance of recycled materials in the one-step recycling of construction solid waste materials into dry mortar through the anti-blocking vibration of the guide hopper 41, the kinetic energy conversion of high-pressure air provided by the gas transmission component, the particle size control of the crushing surface 61, the optional addition of additives, and the coordinated control of modified polycarboxylic acid water-reducing agent.

[0129] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0130] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. A device for preparing dry mortar, characterized in that: include: A coarse crushing structure, the coarse crushing structure comprises a box body with a first cavity inside, a feeding port connected to the first cavity is provided at the top of the box body, a crushing member that can rotate relative to the box body is provided in the first cavity, and the crushing member is used to perform preliminary crushing of the material; a secondary crushing structure, arranged downstream of the coarse crushing structure along the transport direction of the material, the secondary crushing structure comprising a pipe and a crushing member for crushing the material, the pipe having a second cavity connected to the first cavity and a discharge port connected to the second cavity, the crushing member being arranged in the second cavity; A fine crushing structure is arranged downstream of the medium crushing structure along the transport direction of the material, the fine crushing structure comprises a crushing surface for crushing the material, the crushing surface faces the discharge port; A screening structure is arranged downstream of the fine crushing structure along the transport direction of the material, the screening structure comprising screen holes, and the screen holes are used to separate machine-made sand from the material; The feeding and stirring structure is arranged downstream of the screening structure. The feeding and stirring structure comprises a shell with a cavity inside and a stirring component arranged in the cavity. The shell is provided with a feeding port for selectively adding additives to the machine-made sand in the cavity.

2. The preparation device according to claim 1, characterized in that: The coarse crushing structure is located above the medium crushing structure. The preparation device further comprises a funnel-shaped guide hopper and a shaking piece arranged on the outer peripheral side of the guide hopper, the guide hopper is located between the coarse crushing structure and the medium crushing structure, and the upper end of the guide hopper is connected to the box body of the coarse crushing structure through a flexible connection frame, the lower end of the guide hopper is connected to the pipe fitting of the medium crushing structure, and the guide hopper has a guide channel connecting the first cavity and the second cavity; The shaking piece is used for shaking the guide hopper.

3. The preparation device according to claim 2, characterized in that: The flexible connection frame comprises a flexible connection layer and a rigid frame arranged inside the connection layer. There are at least two rigid frames which are arranged in sequence and spaced apart.

4. The preparation device according to claim 2, characterized in that: The crushing member comprises a spiral rod coaxially arranged with the pipe member and a spiral blade arranged on the outer peripheral wall of the spiral rod. The spiral rod can rotate along its own axis and drive the spiral blade to rotate synchronously.

5. The preparation device according to claim 4, characterized in that: The pipe fitting comprises a guide pipe and an accelerating pipe which are connected end to end in sequence, and a feed pipe which is connected to the guide channel of the guide hopper is provided on the outer peripheral wall of the guide pipe; The intermediate crushing structure further includes an air delivery assembly for increasing the material transportation speed, the air delivery assembly including an air pump and a main air pipe and an auxiliary air pipe both connected to the air pump, the main air pipe being arranged at the end of the guide pipe away from the accelerating pipe and being connected to the guide pipe; the auxiliary air pipe being arranged at the outer peripheral wall of the accelerating pipe and being connected to the accelerating pipe; The accelerating tube is a Venturi tube, and the inner wall of the expansion section of the accelerating tube has a tungsten carbide coating with a surface roughness Ra of 0.4 μm≤Ra≤1.6 μm.

6. The preparation device according to claim 1, characterized in that: The open end of the pipe is the discharge port; The fine crushing structure includes a support plate arranged opposite to the discharge port, the crushing surface includes a first plate surface of the support plate facing the discharge port and a convex portion protruding on the first plate surface, the first plate surface is inclined, and the inclination direction of the first plate surface forms an angle α with the axial direction of the pipe, and the angle α satisfies: 25°≤α≤35°.

7. The preparation device according to claim 6, characterized in that: The convex portion is a tungsten steel convex block extending toward the pipe fitting, the tungsten steel convex blocks are multiple and arranged at intervals, the spacing between any two adjacent tungsten steel convex blocks is 40 mm to 60 mm, the length of the tungsten steel convex block is 15 mm to 25 mm, and the angle between the extension direction of the tungsten steel convex block and the axial direction of the pipe fitting is β, and the angle β satisfies: 55°≤β≤65°; And / or, a top edge and / or a side edge of the support plate is provided with a protective plate extending toward the pipe fitting.

8. The preparation device according to claim 1, characterized in that: The screening structure is a vibrating screen, the screen holes are arranged on the vibrating screen, and the aperture of the screen holes is 2 mm to 5 mm; And / or, the preparation device further comprises a conveying structure located between the screening structure and the spraying and stirring structure, the conveying structure comprising a first conveying channel for conveying the machine-made sand to the spraying and stirring structure and a second conveying channel for conveying part of the material except the machine-made sand to the coarse crushing structure; And / or, the preparation device also includes a dust removal structure, which includes a dust collecting part for collecting and storing dust and a driving part for allowing dust to enter the dust collecting part, the dust collecting part is provided with a first dust suction port and a second dust suction port, a gap is left between the discharge port of the medium crushing structure and the fine crushing structure, the first dust suction port is located above the gap and is connected to the gap, and the second dust suction port is located above the feed port and is connected to the feed port.

9. A method for preparing dry-mix mortar, characterized in that: The dry mortar is prepared using the preparation device according to any one of claims 1 to 8, the preparation method comprising: Pre-treating the material so that the particle size of the material is less than or equal to 800 mm; The material is fed into the coarse crushing structure, and the crushing elements of the coarse crushing structure preliminarily crush the material; The intermediate crushing structure crushes the material again; The material impacts the crushing surface of the fine crushing structure from the discharge port of the medium crushing structure at a certain speed to be crushed three times, and then falls into the screening structure; The screening structure separates machine-made sand that meets the particle size requirements from the material that has been crushed three times; The separated machine-made sand is transported to the feeding and stirring structure. Optionally, the feeding and stirring structure stirs the machine-made sand, and optionally, additives are added to the machine-made sand.

10. The preparation method according to claim 9, characterized in that: The additive is a modified polycarboxylate water reducer, and the preparation method of the modified polycarboxylate water reducer is: mixing a polyether macromonomer with hydrogen peroxide in deionized water to obtain a mixture I; Add acrylic acid and ammonium persulfate to ionized water to obtain liquid A; Add L-ascorbic acid and mercaptopropionic acid to deionized water to obtain solution B; Mixing the organosilicon monomer and the ethanol solution to form liquid C; Synchronously adding the liquid A and the liquid B dropwise into the mixture I to obtain a mixture II; Add the liquid C into the mixture II, heat and stir; After cooling, the modified polycarboxylic acid water-reducing agent is obtained.

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