Grouting material and grouting material preparation device

Abstract

The invention provides a grouting material and a grouting material preparation device. The grouting material comprises dead burned magnesium oxide, phosphate, borax, superfine fly ash and mixing water. Wherein the mass ratio of magnesium to phosphorus in the grouting material is 3; the water-binder ratio of the grouting material is 0.18; the sand-cement ratio of the grouting material is 0.8; the doping amount of the borax is 4% of the mass of the dead burned magnesium oxide; the doping amount of the superfine fly ash is 5% of the total mass of the dead burned magnesium oxide, the phosphate and the borax. According to the grouting material provided by the invention, the borax and the superfine fly ash are added, and the M / P of the grouting material, the doping amount of the borax, the doping amount of the superfine fly ash and the temperature of the mixing water are further limited, so that the setting time, the early strength performance and the fluidity of the grouting material are effectively improved; therefore, a reliable implementation scheme is provided for preparing the grouting material with quick setting, early strength performance and good fluidity.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunnel repair, in particular to a grouting material and a grouting material preparation device. BACKGROUND

[0002] The content of this part only provides background information related to the present application, which may not constitute prior art.

[0003] With the continuous development of China's infrastructure, the repair technology of the tunnel is constantly improving. Magnesium phosphate cement (MPC) has the characteristics of short setting time and high early strength. Using MPC to prepare grouting material can meet the requirements of early strength of repair engineering and expand the application range of cement-based grouting material.

[0004] However, the quality of cement-based grouting materials on the market is uneven. The setting time of many grouting materials is uncontrollable, and the early strength does not meet the engineering requirements, which delays the progress of the project and causes economic losses. In addition, the low flowability of the grouting material also increases the difficulty and time of construction, affecting the efficiency. Therefore, it is of great significance and practical value to develop a grouting material with fast setting, early strength and good flowability. SUMMARY

[0005] Therefore, the first object of the present application is to provide a grouting material to at least overcome the uncontrollable setting time, poor early performance and flowability of known cement-based grouting materials.

[0006] The second object of the present application is to provide a grouting material preparation device for preparing the above-mentioned grouting material.

[0007] The object of the present application is achieved by the following technical solutions: On the one hand, the present application provides a grouting material, comprising: dead burned magnesium oxide, phosphate, borax, ultra-fine fly ash and mixed water; The mass ratio of magnesium to phosphorus of the grouting material is 3; the water-binder ratio of the grouting material is 0.18; the sand-binder ratio of the grouting material is 0.8; the dosage of the borax is 4% of the mass of the dead burned magnesium oxide; the dosage of the ultra-fine fly ash is 5% of the total mass of the dead burned magnesium oxide, the phosphate and the borax.

[0008] Optionally, the temperature of the mixed water is 40℃.

[0009] Optionally, the phosphate is ammonium dihydrogen phosphate.

[0010] On the other hand, the present application provides a grouting material preparation device for preparing the above-mentioned grouting material, comprising: a machine body defining a receiving space with a taking and placing opening; A fixed component is disposed in the accommodating space and can reciprocate along the height direction; a stirring component, disposed in the accommodating space and located above the fixing component; A stirring container is positioned on the fixed assembly; the opening of the stirring container faces the stirring component; an opening and closing door configured to move along a predetermined movement path between a closed position for closing the access opening and an open position for opening the access opening; The drive assembly is configured to simultaneously provide the power required for movement to the fixed assembly and the opening and closing door, so that: when the fixed assembly moves upward, the opening and closing door moves from the open position to the closed position; when the fixed assembly moves downward, the opening and closing door moves from the closed position to the open position.

[0011] Optionally, when the opening and closing door is in the closed position, the accommodating space is in a sealed state.

[0012] Optionally, the motion path is an arc path, and the center of the arc path is located on the axis of the stirring component.

[0013] Optionally, the opening and closing door includes two arc-shaped door bodies; the two door bodies can move between the closed position and the open position in opposite directions along the movement path.

[0014] Optionally, the driving component includes: The screw is rotatably arranged along the height direction; the fixing assembly is driven and cooperated with the screw to convert the rotational motion of the screw into its own linear motion along the axial direction of the screw; The first gear ring and the second gear ring are both coaxially arranged with the stirring component; the first gear ring, the second gear ring and the screw are connected by a gear transmission structure, so that the first gear ring and the second gear ring rotate synchronously with the screw, and the rotation directions of the first gear ring and the second gear ring are opposite; the two door bodies are respectively connected to the first gear ring and the second gear ring; A driving motor is connected to the screw rod to drive the screw rod to rotate.

[0015] Optionally, a receiving cavity is provided inside the body, and the receiving cavity is provided with an escape opening which is communicated with the receiving space and for the opening and closing door to pass through; Wherein, when the opening and closing door is in the open position, the opening and closing door is hidden in the accommodating cavity.

[0016] Optionally, a limiting groove is provided on the machine body, and the limiting groove extends along the motion path; the bottom of the opening and closing door is movably arranged in the limiting groove. The technical scheme of the embodiment of the present application has at least the following advantages and beneficial effects: The grouting material provided by the present application effectively improves the setting time, early strength performance and fluidity of the grouting material by adding borax and superfine fly ash and further limiting the M / P, borax content, superfine fly ash content and mixing water temperature of the grouting material, thereby providing a reliable implementation scheme for preparing a grouting material with fast setting, early strength performance and good fluidity. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The comparative diagram of the compressive strength of the grouting material test piece at 15 min and 30 min under different borax contents of the embodiment 1 of the present application is provided; Figure 2 The comparative diagram of the influence of M / P on the working performance of the grouting material of the embodiment 1 of the present application is provided; Figure 3 The comparative diagram of the compressive strength of the grouting material test piece at different curing ages under different M / P of the embodiment 1 of the present application is provided; Figure 4 The comparative diagram of the influence of the superfine fly ash content on the working performance of the grouting material of the embodiment 1 of the present application is provided; Figure 5 The comparative diagram of the compressive strength of the grouting material test piece at different curing ages under different superfine fly ash contents of the embodiment 1 of the present application is provided; Figure 6 The SEM diagram of the grouting material test piece when the superfine fly ash content is 2.5% of the embodiment 1 of the present application is provided; Figure 7 The SEM diagram of the grouting material test piece when the superfine fly ash content is 5% of the embodiment 1 of the present application is provided; Figure 8 The SEM diagram of the grouting material test piece when the superfine fly ash content is 7.5% of the embodiment 1 of the present application is provided; Figure 9 The comparative diagram of the influence of different temperature mixing water on the working performance of the grouting material of the embodiment 1 of the present application is provided; Figure 10 The comparative diagram of the compressive strength of the grouting material test piece at 15 min and 30 min under different mixing water temperatures of the embodiment 1 of the present application is provided; Figure 11 The SEM diagram of the grouting material test piece when the mixing water temperature is 20℃ of the embodiment 1 of the present application is provided; Figure 12 The SEM diagram of the grouting material test piece when the mixing water temperature is 30℃ of the embodiment 1 of the present application is provided; Figure 13The SEM image of the grouting material test piece provided by the embodiment 1 of the present application is shown in the following figure when the mixing water temperature is 40℃ Figure 14 The curve graph of the influence of the super-fine fly ash content provided by the embodiment 1 of the present application on the hydration reaction heat release of the grouting material is shown in the following figure Figure 15 The structural schematic diagram of the grouting material preparation device provided by the embodiment 2 of the present application in one state is shown in the following figure, which shows the case when the opening and closing door is in the open position Figure 16 The structural schematic diagram of the grouting material preparation device provided by the embodiment 2 of the present application in another state is shown in the following figure, which shows the case when the opening and closing door is in the closed position Figure 17 The structural schematic diagram of the machine body provided by the embodiment 2 of the present application is shown in the following figure Figure 18 The structural schematic diagram of the fixing assembly, the driving assembly and the opening and closing door provided by the embodiment 2 of the present application in one state is shown in the following figure, which shows the case when the two door bodies of the opening and closing door are both in the open position Figure 19 The structural schematic diagram of the fixing assembly, the driving assembly and the opening and closing door provided by the embodiment 2 of the present application in another state is shown in the following figure, which shows the case when the two door bodies of the opening and closing door are both in the closed position

[0018] Figure: 10-machine body, 12-accommodation space, 13-avoidance port, 14-limiting groove, 20-fixing assembly, 21-connection part, 22-fixing part, 30-stirring part, 40-stirring container, 50-driving assembly, 51-screw rod, 52-first ring gear, 53-second ring gear, 54-driving motor, 55-gear transmission structure, 551-center gear, 552-first transmission gear, 553-second transmission gear, 554-third transmission gear, 60-opening and closing door, 61-door body DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the present application more clear, the technical scheme of the present application will be described clearly and completely in combination with the specific embodiments. The same reference signs in the drawings represent the same parts. It should be noted that the described embodiments are part of the embodiments of the present application, not all the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0020] Feasible implementations within the scope of the present application can have fewer components, other components not shown in the drawings, different components, differently arranged components, differently connected components, etc. compared to the embodiments shown in the drawings. Moreover, two or more components in the drawings can be implemented in a single component, or a single component shown in the drawings can be implemented as multiple separate components.

[0021] Embodiment 1 The embodiment 1 of the present application provides a grouting material, which comprises dead-burned magnesium oxide, phosphate, borax, ultra-fine fly ash and mixing water. Wherein, the grouting material is prepared from dead-burned magnesium oxide, phosphate, borax, ultra-fine fly ash, mixing water and quartz sand.

[0022] Wherein, the dead-burned magnesium oxide (MgO, referred to as M for short) is selected from Daqiao City Juge Platinum High-temperature Refractory Material Company, which is calcined from magnesite at 1800℃ and is in yellow-brown powder form. The phosphate can be ammonium dihydrogen phosphate, which is selected from Wujiang City Jinjin Light Chemical Co., Ltd. and is in white crystal form with a purity greater than 98%. The borax (Na2B4O7·10H2O, referred to as B for short) is selected from Tianjin Huasheng Scientific Reagent Co., Ltd. and is in white powder form with a content of ≥99.5%. The ultra-fine fly ash (referred to as UFA for short) can be selected from Grade I fly ash produced by Chengdu Bolai Resource Recycling Development Co., Ltd. The mixing water can be tap water.

[0023] According to the grouting material provided by the embodiment 1 of the present application, the magnesium-phosphorus mass ratio (M / P) of the grouting material is 3; the water-binder ratio (W / C) of the grouting material is 0.18; the sand-binder ratio (S / C) of the grouting material is 0.8; the borax content is 4% of the mass of the dead-burned magnesium oxide; and the ultra-fine fly ash content is 5% of the total mass of the dead-burned magnesium oxide, the phosphate and the borax. Moreover, the temperature of the mixing water is 40℃ when the grouting material is actually prepared.

[0024] Wherein, the grouting material provided by the embodiment 1 of the present application can be prepared according to the following method. Specifically, the preparation method comprises: Step 10. After determining the ratio of each component of the grouting material, the dead-burned magnesium oxide, the phosphate, the borax and the ultra-fine fly ash with the predetermined mass are weighed by using an electronic scale.

[0025] Step 20. The dead-burned magnesium oxide, the phosphate, the borax and the ultra-fine fly ash with the predetermined mass are added into a grouting material preparation device such as a cement mortar mixer for dry mixing for 30s to obtain mixed dry materials.

[0026] Step 30. According to the water-binder ratio of the grouting material, a predetermined amount of mixing water is added to the mixed dry materials, and slow stirring is performed for 30s to obtain mixed slurry.

[0027] Step 40. According to the mortar ratio of the grouting material, a predetermined amount of quartz sand is added to the mixed grouting material, and rapid stirring is performed for 180 s, so that the grouting material provided in Example 1 of the present application is obtained.

[0028] In order to verify the key performance indicators such as the fluidity, setting time, mechanical properties, hydration temperature rise, and micro morphology of the grouting material, after the grouting material is obtained in step S40, the grouting material can be poured into a standard mold and placed on a vibration table to make the grouting material dense and reduce the internal bubbles of the grouting material. After the grouting material is cured and formed, demolding treatment is performed, so that the grouting material test piece corresponding to the grouting material is obtained. For example, the size of the grouting material test piece can be 25 mm x 25 mm x 280 mm.

[0029] In the grouting material, the fluidity of the grouting material can be tested according to the method specified in GB / T 2419-2005 "Cement Mortar Fluidity Test Method". The setting time of the grouting material can be tested according to the Vicat method in the GB / T 1346-2011 "Cement Standard Consistency Water Consumption, Setting Time, and Stability Test Method" standard. The mechanical properties of the grouting material can be tested according to the specifications in GB / T 17671-1999 "Cement Mortar Strength Test Method". The hydration temperature rise of the grouting material can be recorded in real time by using the RC-4 repeatability temperature (humidity) recorder of Jiangsu Jingchuang Electrical Co., Ltd. The micro morphology of the grouting material can be obtained by SEM testing.

[0030] In the grouting material provided in Example 1 of the present application, borax as a retarder mainly functions to prolong the setting time of the grouting material to achieve the purpose of human control, and will not cause the pipe blocking phenomenon. Specifically, according to the reaction mechanism of borax, the physical effect of borax is to wrap a layer of borax magnesium on the surface of MgO, thereby achieving the effect of retarding the setting, and avoiding the pipe blocking problem caused by the too fast setting speed of magnesium phosphate cement.

[0031] In order to verify the influence of the borax content on the performance of the grouting material, the inventors of the present application first fixed the M / P=3, W / C=0.18, and S / C=0.8 of the grouting material, and performed the test of the influence of the borax content on the performance of the grouting material. The mix proportion used in the test of the influence of the borax content on the performance of the grouting material is shown in Table 1.

[0032] Table 1 Mix proportion of grouting material in test of influence of borax content on performance of grouting material

[0033] After completing the test of the influence of the borax content on the performance of the grouting material, the fluidity and setting time table of the grouting material under different borax contents shown in Table 2 is obtained.

[0034] Table 2 Fluidity and setting time of grouting material under different borax contents

[0035] Table 2 shows that the initial setting time of the grout decreases with decreasing borax content. When the borax content drops from 6% to 4%, the initial setting time decreases from over ten minutes to 5.5 minutes, a decrease of over 50%. At 4.5% borax, the initial setting time is 6 minutes and 3 seconds, exceeding the initial setting time at 4%. When the borax content is low, the grout hydrates rapidly, setting and hardening within minutes, resulting in insufficient fluidity. As the borax content increases, the borax inhibits the hydration reaction to a certain extent, allowing the grout to flow more quickly, thereby increasing initial fluidity. Experimental studies have shown that at a 6% borax content, the setting time is too slow, failing to meet the fast-setting requirements of tunnel anchor grouting. At 4% and 4.5% borax contents, the grout meets both initial setting time and fluidity requirements.

[0036] Secondly, Figure 1 The compressive strength of the grouting material specimens at different borax dosages at 15 minutes and 30 minutes is shown. It is worth noting that due to the long initial setting time of the grouting material specimens corresponding to the addition of 6% borax, the mechanical strength data of the grouting material specimens at 15 minutes were not collected.

[0037] Depend on Figure 1 As can be seen, for 4% and 6% borax additions, the compressive strength of the grouting specimens at 30 minutes increased by 24.4%. At 30 minutes, the grouting specimen with 4% borax addition reached a maximum compressive strength of 59.6 MPa, slightly higher than that with 4.5% borax addition. The grouting specimen with 6% borax addition had the lowest strength, at 47.9 MPa. This is because borax hinders the hydration reaction, inhibiting the formation of struvite (a hydration product of magnesium phosphate cement) and altering the struvite crystal structure, resulting in reduced strength in the grouting specimens.

[0038] It can be seen that the mechanical properties of the grouting material are not significantly different when the borax content is 4% and 4.5%. Considering the effect of the borax content on the flow properties and initial setting time of the grouting material, the borax content is determined to be 4% in Example 1 of the present invention.

[0039] To verify the effect of the M / P ratio on grouting material performance, the inventors conducted a test on the effect of the M / P ratio on grouting material performance, fixing the W / C ratio of the grouting material to 0.18, the S / C ratio to 0.8, and the borax content to 4%. The mix ratios used in the test on the effect of the M / P ratio on grouting material performance are shown in Table 3.

[0040] Table 3 Mix ratio of grouting materials in the test of the influence of M / P on the performance of grouting materials

[0041] After completing the test on the effect of M / P on the performance of grouting materials, we obtained Figure 2 The comparison chart of the influence of M / P on the working performance of grouting materials is shown in the figure. Figure 2 As shown in the figure, as the M / P ratio increases from 2:1 to 5:1, the fluidity of the grouting material first increases and then decreases. When M / P = 3, the fluidity reaches a maximum of 255 mm. When M / P = 5, the fluidity reaches a minimum of 177 mm. At this point, the fluidity of the grouting material is low, making grouting difficult. As the M / P ratio increases from 2:1 to 5:1, the setting time of the grouting material decreases. When M / P = 5, the setting time is as short as 6 minutes and 12 seconds. When M / P = 2, the setting time is as long as 12 minutes. This is because as the MgO content increases, more water is used to wet the surface of the magnesium oxide, resulting in a decrease in the mixing water content. At the same time, a large amount of phosphate, unable to fully dissolve in water, remains in the slurry as solid particles, increasing the slurry's flow resistance and reducing the fluidity of the grouting material.

[0042] Secondly, Figure 3 The following figure shows the compressive strength comparison of grouting material specimens at different curing ages under different M / P conditions. Figure 3 As shown, the grouting material exhibits high early strength. The compressive strength of the grouting materials at different M / P ratios reached over 30 MPa at both 15 and 30 minutes. Initially, the compressive strength of the grouting material increases with increasing curing age. This is due to the high stability of struvite, a hydration product generated by the hydration of the grouting material. With increasing curing age, the amount of struvite generated gradually increases, and the struvite crystals can overlap to form a network structure, enhancing the compressive strength of the grouting material.

[0043] After a curing age of 28 days, the compressive strength of the MPC grout decreased. This is likely due to the decomposition of struvite. In a humid environment, struvite gradually hydrolyzes into Mg(OH)2 and phosphate, causing the crystal structure to deteriorate. The resulting Mg(OH)2 product has a loose structure, increasing porosity and leading to a decrease in mechanical properties.

[0044] In addition, the rapid heat release from hydration of the grouting material at an early stage causes a sudden rise in local temperature, resulting in thermal stress microcracks. Over time, these microcracks expand under load or environmental influences, weakening the overall structure.

[0045] When M / P increases from 2:1 to 3:1, the compressive strength of the grouting material specimen at each time point shows an upward trend. At 15 min, 30 min, 3d, 7d and 28d, the maximum compressive strength of the grouting material specimen is 51.9MPa, 59.8MPa, 64.4MPa, 57.8MPa and 54.4MPa respectively. When the amount of phosphate is large, there are a large number of undissolved phosphate particles in the grouting material specimen. Because the strength of the phosphate particles is low, they cannot play a skeleton supporting role, thereby leading to a decrease in the mechanical properties of the specimen. On the other hand, with the increase of the content of MgO, the generation of struvite is promoted, and the mechanical properties of the specimen are increased. When M / P increases from 3:1 to 5:1, the compressive strength of the grouting material specimen at each curing age shows a downward trend. When M / P = 5:1, the compressive strength of the grouting material specimen is at the lowest value. With the decrease of the content of phosphate, the number of struvite crystals generated by hydration is reduced, which affects the development of the strength of the grouting material.

[0046] When M / P = 3:1, the compressive strength of the grouting material specimen can reach the maximum, and the late compressive strength damage is low. Considering the liquidity, initial setting time and compressive strength of the grouting material, the M / P of the grouting material in Example 1 of the present application is determined to be 3.

[0047] In the grouting material provided in Example 1 of the present application, the ultra-fine fly ash is a fine powder particle collected from the flue gas generated by burning coal powder in a coal-fired power plant, and has high adsorption activity. The role of ultra-fine fly ash in the grouting material is mainly reflected in the morphological effect, activity effect and micro-aggregate effect.

[0048] Among them, the micro-aggregate effect and low porosity of the ultra-fine fly ash can improve the compactness of the grouting material, but at the same time, it may also lead to a decrease in the mechanical properties of the grouting material, and the main reasons are as follows: 1. Because the ultra-fine fly ash has a large specific surface area and a porous structure, it shows strong adsorption capacity. When the ultra-fine fly ash is added to the grouting material, the ultra-fine fly ash will adsorb part of the phosphate, thereby reducing the amount of struvite. In addition, the ultra-fine fly ash, as a non-homogeneous material, contains impurities and carbon components, which will adsorb on the surface of the hydration product to form loose and porous hydration products. Since struvite is the main source of the strength of the grouting material, its reduction will significantly affect the late strength development of the material.

[0049] 2. The addition of ultra-fine fly ash will reduce the early pH value of the grouting material, delay the dissolution of MgO and the generation of struvite, and lead to slow development of the early strength of the grouting material. In addition, the change of pH value may also affect the ionization balance of phosphate, and then affect the reaction rate and product formation.

[0050] 3. When the content of superfine fly ash increases, the effective water-binder ratio of the grouting material decreases, and part of the calcined magnesium oxide and phosphate is replaced, resulting in a decrease in the hydration product, thereby reducing the compressive strength of the grouting material.

[0051] Therefore, it is necessary to further study the content of superfine fly ash.

[0052] In order to verify the influence of the content of superfine fly ash on the performance of the grouting material, the inventors of the present application fixed M / P=3, W / C=0.18, S / C=0.8 of the grouting material, and the content of borax was 4%, and the influence of the content of superfine fly ash on the performance of the grouting material was tested. The mixing proportion used in the test of the influence of the content of superfine fly ash on the performance of the grouting material is shown in Table 4.

[0053] Table 4 Mixing proportion of grouting material in the test of the influence of the content of superfine fly ash on the performance of the grouting material

[0054] After completing the test of the influence of the content of superfine fly ash on the performance of the grouting material, the comparative graph of the influence of the content of superfine fly ash on the working performance of the grouting material is shown in Figure 4

[0055] As shown in Figure 4 In terms of the fluidity of the grouting material, with the increase of the content of superfine fly ash, the fluidity increases from 250mm to 260mm. This shows that superfine fly ash reduces the friction between cement particles, plays the role of lubricant, and makes the grouting material flow more easily. When the content of superfine fly ash increases from 5% to 7.5%, the fluidity increases more.

[0056] When the content of superfine fly ash is 5%, the setting time of the grouting material is the shortest, which is 7min46s. When the content of superfine fly ash is 7.5%, the setting time of the grouting material is the longest, which is 8min46s. This is because when the proportion of superfine fly ash increases, the hydration process of the grouting material slows down due to the decrease of cementitious materials, resulting in a significant decrease in heat release during hydration, and thus increasing the setting time of the grouting material.

[0057] Figure 5 The comparative graph of the compressive strength of the grouting material test piece under different curing ages under different contents of superfine fly ash is shown. According to Figure 5 ​It can be seen that the early compressive strength of the grouting material increases with the increase of the curing age, but decreases with the increase of the content of the superfine fly ash. Therefore, the incorporation of the superfine fly ash will damage the mechanical properties of the grouting material to some extent, and the greater the content of the superfine fly ash, the greater the damage to the mechanical properties. Moreover, compared with the grouting material without the incorporation of the superfine fly ash, the mechanical loss of the grouting material is the largest at 15 min, about 80%. When the content of the superfine fly ash is 7.5%, the compressive performance of the grouting material is the lowest, and the compressive strength decreases to 47.1 MPa when the curing age reaches 3 d, which is reduced by 27.2% compared with the control group (i.e. the group with the content of the superfine fly ash being 0%). Although the fluidity of the grouting material is the largest when the content of the superfine fly ash is 7.5%, the mechanical performance is poor, so the grouting material prepared by the ratio of the content of the superfine fly ash being 7.5% is not considered. When the content of the superfine fly ash is 2.5%, the compressive performance loss of the grouting material is the smallest, and the compressive strength is 59.8 MPa when the curing age is 3 d, which is very small compared with 64.4 MPa of the control group.

[0058] Figures 6 to 8 The SEM images of the grouting material specimens under different contents of superfine fly ash are respectively shown. Figures 6 to 8 It can be seen that part of the superfine fly ash particles fill in the voids of the grouting material matrix, improving the compactness of the matrix, and a small amount of superfine fly ash particles are embedded around the struvite to form a more dense network structure. With the increase of the content of the superfine fly ash, the coal ash makes the structure of the grouting material matrix loose, resulting in lower compressive strength of the grouting material.

[0059] In summary, when preparing the grouting material in practice, the content of the superfine fly ash needs to be strictly controlled to balance the plasticizing effect and the reduction of mechanical performance loss. Therefore, in Example 1 of the present application, the content of the superfine fly ash is determined to be 5%.

[0060] In addition, in addition to the above factors that may affect the performance of the grouting material, the inventors of the present application further found that the temperature of the mixing water is also one of the factors affecting the performance of the grouting material.

[0061] In order to verify the influence of the mixing water temperature on the performance of the grouting material, the inventors of the present application fixed the M / P of the grouting material to be 3, W / C to be 0.18, S / C to be 0.8, the content of borax to be 4%, and the content of the superfine fly ash to be 5%, and conducted a test on the influence of the mixing water temperature on the performance of the grouting material. The mixing ratio used in the test of the influence of the mixing water temperature on the performance of the grouting material is shown in Table 5.

[0062] Table 5 Mixing ratio of grouting material in test of influence of mixing water temperature on performance of grouting material

[0063] Figure 9The comparative chart showing the influence of mixing water at different temperatures on the workability of the grouting material is shown. Figure 9 It can be seen that with the increase of the temperature of mixing water, both the fluidity and the setting time of the grouting material decrease. When the temperature of mixing water is 20℃, the fluidity of the grouting material is the highest, 255mm. When the temperature of mixing water is increased to 30℃ and 40℃, the fluidity of the grouting material is 242mm and 230mm respectively. As to the setting time, when the temperature of mixing water is 20℃, the setting time of the grouting material is the longest, 7min 46s; when the temperature of mixing water is 40℃, the setting time is the shortest, only 4min 12s. This shows that higher temperature of mixing water accelerates the hydration reaction, leading to the faster formation of the paste structure of the grouting material, thus reducing the fluidity and the setting time.

[0064] Figure 10 The compressive strength of the grouting material specimen at 15min and 30min under different temperatures of mixing water is shown. Figure 10 It can be seen that with the increase of the temperature of mixing water, the early strength of the grouting material specimen at 15min increases obviously. When the temperature of mixing water is increased from 20℃ to 30℃, the compressive strength of the grouting material specimen is increased by 115.7%. When the temperature of mixing water is increased from 30℃ to 40℃, the compressive strength of the grouting material specimen is increased by 64.9%. This is because with the increase of the temperature of mixing water, the hydration reaction speed of magnesium phosphate is accelerated, which promotes more hydration products to form in a short time, thus improving the early strength.

[0065] As to the compressive strength at 30min, the compressive strength of the grouting material specimen at the temperature of 20℃ is the largest, 48.4MPa. As to the grouting material specimens at the temperatures of 30℃ and 40℃, the compressive strength at 30min is similar, 42.1MPa and 43.9MPa respectively. It can be seen that the strength of the grouting material specimen at 30min under different temperatures of mixing water is not much different, which shows that high temperature may accelerate the hydration reaction.

[0066] Figures 11 to 13 The SEM images of the grouting material specimen under different temperatures of mixing water are shown respectively. Figures 11 to 13 It can be seen that under different temperatures of mixing water, the crystal morphology of struvite is not the same. According to the SEM images, it can be found that the struvite crystal has long columnar, flaky and reticular morphologies. Under the temperature of 20℃ of mixing water, the hydration reaction rate is slow, the crystal growth time is sufficient, the struvite is mainly in long columnar crystal, and the size is small. With the increase of the temperature of mixing water, the crystal size becomes larger and larger, the amount of hydration product increases, the system density increases, and the porosity decreases. It can be seen comprehensively that under the temperature of 40℃ of mixing water, the mechanical property of the MPC grouting material is the best. Therefore, the temperature of mixing water in the embodiment 1 of the present application is determined to be 40℃.

[0067] On this basis, the inventors of the present application also carried out a test on the influence of the super-fine fly ash content on the hydration reaction heat release of the grouting material, to explore the influence of the super-fine fly ash on the hydration reaction heat release of the grouting material. In the test, the mixing proportion of the grouting material used in the test on the influence of the super-fine fly ash content on the performance of the grouting material is shown in Table 6.

[0068] Table 6 Mixing proportion of the grouting material in the test on the influence of the super-fine fly ash content on the performance of the grouting material

[0069] Figure 14 The influence curve of the super-fine fly ash content on the hydration reaction heat release of the grouting material is shown in FIG. 2. As shown in FIG. 2, Figure 14 As can be seen from FIG. 2, when the super-fine fly ash content is 2.5%, the initial temperature of the grouting material is 13.8℃, and when the hydration reaction starts, the grouting material rapidly heats up, and the temperature reaches a peak value of 39.3℃ at about 12 min. Then, the hydration reaction heat release temperature gradually decreases, and the temperature of the grouting material specimen cools down to 27.4℃ at about 30 min. Compared with the super-fine fly ash content of 2.5%, when the super-fine fly ash content is 5%, the temperature of the grouting material reaches a maximum value of 46.9℃ at about 10 min. By comparing the super-fine fly ash contents of 2.5% and 5%, it is found that the appropriate increase of the super-fine fly ash content can increase the heat peak temperature and accelerate the time of the temperature peak value, which is consistent with the test results of the setting time.

[0070] For the super-fine fly ash content of 7.5%, after the hydration reaction starts, the heating speed of the grouting material is slow, and the temperature reaches a peak value of 36.0℃ at about 15 min. The overall reaction heat release temperature fluctuates slightly. By comparing the hydration reaction heat release of the grouting material under different super-fine fly ash contents, it is found that the time of the temperature peak value and the peak value size are related to the super-fine fly ash content. When the super-fine fly ash content is 5%, the temperature peak value of the grouting material is the highest and appears the earliest. This proves that with the increase of the super-fine fly ash content, the temperature peak value will first increase and then decrease.

[0071] As can be seen from the above, the grouting material provided by the embodiment 1 of the present application, by adding borax and super-fine fly ash, and further limiting the M / P of the grouting material, the borax content, the super-fine fly ash content and the temperature of the mixed water, effectively improves the setting time, the early strength performance and the fluidity of the grouting material, thereby providing a reliable implementation scheme for preparing the grouting material with fast setting, early strength performance and good fluidity.

[0072] Embodiment 2 As can be seen from the above embodiment 1, in the research and development stage of the grouting material, the grouting material required for the test is usually prepared by means of a cement mortar mixer. However, the inventors of the present application have found that the known cement mortar mixer is in operation, the mixing container 40 containing the material is always exposed to the external environment. Since the raw materials for preparing the grouting material, such as heavy-burned magnesium oxide, phosphate, borax, etc., are in powder form, when the mixture of multiple materials is stirred, the dust or slurry is easily scattered and diffused into the external environment, thereby affecting the health of the relevant personnel and polluting the environment.

[0073] Therefore, the embodiment 2 of the present application provides a grouting material preparation device, in particular a cement mortar mixer capable of preventing dust or slurry from being scattered when preparing the grouting material. The grouting material preparation device provided by the embodiment 2 of the present application is at least applicable to the preparation of the grouting material described in the above embodiment 1.

[0074] Figure 15 and Figure 16 are respectively structural schematic diagrams of the exemplary grouting material preparation device provided by the embodiment 2 of the present application in two different states. First, as shown in Figure 15 , according to the embodiment 2 of the present application, the grouting material preparation device can include a machine body 10, a fixing assembly 20, a stirring component 30, a stirring container 40, and a driving assembly 50.

[0075] Referring to Figure 15 or Figure 17 , the machine body 10 defines an accommodation space 12 with a taking and placing opening, so as to place the stirring container 40 into the accommodation space 12 through the taking and placing opening. Exemplarily, the accommodation space 12 can be a U-shaped notch formed on the machine body 10, the front side, left side and right side of the notch can be in an open structure, and the top side, bottom side and rear side are in a closed structure. Among them, the part of the notch in the open structure can be regarded as the taking and placing opening.

[0076] The fixing assembly 20 is arranged in the accommodation space 12 and can reciprocate along the height direction. Among them, the fixing assembly 20 is mainly used to provide a carrier for the installation of the stirring container 40 and drive the stirring container 40 to reciprocate along the height direction.

[0077] The stirring component 30 is arranged in the accommodation space 12 and above the fixing assembly 20. Among them, the stirring component 30 is adapted to rotate under the drive of an independent driving component (not shown in the figure), so as to stir the material in the stirring container 40 through the rotation of the stirring component 30 when the stirring container 40 moves upward to the stirring component 30 extending into the inside of the stirring container 40.

[0078] The stirring container 40 is positioned on the fixing assembly 20. And the opening of the stirring container 40 is opposite to the stirring component 30.

[0079] The driving assembly 50 is configured to provide the power required for the movement of the fixed assembly 20. That is, the fixed assembly 20 is capable of reciprocating in the height direction under the driving of the driving assembly 50.

[0080] It can be understood that the configuration of the grouting material preparation device described above is actually the configuration of the cement mortar mixer known in the prior art. In such a device, since the mixing container 40 is exposed through the access opening of the accommodation space 12 throughout the entire operation process, it is easy for dust or slurry to fly around and spread to the external environment when mixing the mixture composed of multiple raw materials.

[0081] For this purpose, with continued reference to Figure 15 and Figure 16 , the grouting material preparation device provided by the embodiment 2 of the present application can further include an opening and closing door 60. The opening and closing door 60 is configured to move along a predetermined movement path between a closed position closing the access opening and an open position opening the access opening. The movement path of the opening and closing door 60 can be an arc-shaped path, in which case the opening and closing manner of the opening and closing door 60 is similar to that of a rotating door. Of course, in other embodiments of the present application, the movement path of the opening and closing door 60 can also be a straight path, in which case the opening and closing manner of the opening and closing door 60 is similar to that of a translating door.

[0082] It can be understood that, by providing the opening and closing door 60, the access opening of the accommodation space 12 can be selectively opened and closed as needed, so that the access opening of the accommodation space 12 can be closed during the mixing operation (see Figure 16 ). Moreover, in the case of the aforementioned U-shaped notch of the accommodation space 12, when the opening and closing door 60 is in the closed position, the accommodation space 12 can be in a closed state. Such a design can effectively prevent dust or slurry from flying around and spreading to the external environment during the mixing operation.

[0083] On this basis, the embodiment 2 of the present application further limits that the driving assembly 50 can also provide the power required for the movement of the opening and closing door 60. That is, the driving assembly 50 is configured to provide power to both the fixed assembly 20 and the opening and closing door 60, so that when the fixed assembly 20 moves upward, the opening and closing door 60 moves from the open position to the closed position, and when the fixed assembly 20 moves downward, the opening and closing door 60 moves from the closed position to the open position.

[0084] Based on the above settings, when preparing the grouting material described in the above embodiment 1 using the grouting material preparation device provided by the embodiment 2 of the present application, the following preparation method can be used.

[0085] Specifically, the preparation method includes: Step 100. After the ratio of each component of the grouting material is determined, the predetermined mass of the dead-burned magnesium oxide, phosphate, borax and ultra-fine fly ash are weighed by using the electronic scale.

[0086] Step 200. The predetermined mass of the dead-burned magnesium oxide, phosphate, borax and ultra-fine fly ash are added into the stirring container 40. Then the stirring container 40 is positioned on the fixing assembly 20. After that, the driving assembly 50 drives the fixing assembly 20 to move upwardly, so as to drive the stirring container 40 to move upwardly synchronously. In the process, the opening and closing door 60 moves along the predetermined movement path from the opening position to the closing position under the power provided by the driving assembly 50. When the stirring container 40 moves to the position where the stirring part 30 extends into the stirring container 40 and reaches the appropriate position, the opening and closing door 60 just moves to the closing position, so as to close the access of the accommodating space 12. Then, the stirring part 30 rotates to stir the materials in the stirring container 40 for 30s, so as to obtain the mixed dry materials.

[0087] Step 300. The driving assembly 50 drives the fixing assembly 20 to move downwardly, so as to drive the stirring container 40 to move downwardly synchronously. In the process, the opening and closing door 60 moves along the predetermined movement path from the closing position to the opening position under the power provided by the driving assembly 50. When the stirring container 40 moves to the initial position, the opening and closing door 60 just moves to the opening position, so as to open the access of the accommodating space 12. Then, the predetermined amount of mixing water is added into the mixed dry materials in the stirring container 40 through the access according to the water-binder ratio of the grouting material.

[0088] On this basis, the fixing assembly 20 drives the stirring container 40 to move upwardly again in the manner described in step 200, until the stirring part 30 extends into the stirring container 40 and reaches the appropriate position, and the opening and closing door 60 is in the closing position again. Then, the stirring part 30 rotates to stir the materials in the stirring container 40 slowly for 30s, so as to obtain the mixed slurry.

[0089] Step 400. The fixing assembly 20 drives the stirring part 30 to move downwardly in the manner described in step S300, until the opening and closing door 60 is in the opening position. Then, the predetermined amount of quartz sand is added into the mixed slurry in the stirring container 40 through the access according to the sand-binder ratio of the grouting material.

[0090] On this basis, the fixing assembly 20 drives the stirring container 40 to move upwardly again in the manner described in step 200, until the stirring part 30 extends into the stirring container 40 and reaches the appropriate position, and the opening and closing door 60 is in the closing position again. Then, the stirring part 30 rotates to stir the materials in the stirring container 40 quickly for 180s, so as to obtain the grouting material described in example 1.

[0091] It can be seen that the grouting material preparation device provided by the embodiment 2 of the present application adds the opening and closing door 60 on the basis of the known cement mortar mixer, and can effectively prevent dust or slurry from flying around and spreading to the external environment through the opening and closing door 60 in the closed position during the mixing operation. At the same time, by using one driving assembly 50 to provide the power required for the movement of the fixed assembly 20 and the opening and closing door 60, the device structure is simplified, the manufacturing and use costs are reduced, the linkage of the fixed assembly 20 and the opening and closing door 60 is realized, and the operation efficiency is significantly improved. The linkage design further reduces the manual intervention link, and makes the whole mixing process more automated.

[0092] In some possible embodiments, the opening and closing door 60 is made of transparent material, such as tempered glass, so as to facilitate real-time viewing of the inside of the accommodation space 12 when the opening and closing door 60 is in the closed position.

[0093] In some possible embodiments, the movement path of the opening and closing door 60 can be an arc path, and the center of the arc path is located on the axis of the stirring component 30. That is, the opening and closing door 60 can rotate around the axis of the stirring component 30 to open or close the taking and placing opening.

[0094] Compared with the straight path, the use of the arc path can reduce the volume of the whole grouting material preparation device in the transverse direction as much as possible, especially the volume of the grouting material preparation device in the transverse direction when the opening and closing door 60 is in the open position, thereby facilitating the compact design of the device.

[0095] In some possible embodiments, the inside of the machine body 10 is provided with an accommodation cavity (not shown in the figure), and the accommodation cavity is provided with a avoiding opening 13 which is in communication with the accommodation space 12 and through which the opening and closing door 60 passes, as shown in Figure 17 Exemplarily, the machine body 10 can be a hollow shell, and the inside of the shell is taken as the accommodation cavity, and the avoiding opening 13 can be opened on the rear side wall of the accommodation space 12.

[0096] In this way, the opening and closing door 60 can move along the predetermined movement path through the avoiding opening 13 between the open position in the accommodation cavity and the closed position outside the accommodation cavity. When the opening and closing door 60 is in the open position, the opening and closing door 60 is hidden in the accommodation cavity.

[0097] Through the design of the accommodation cavity and the avoiding opening 13, on the basis of enabling the opening and closing door 60 to move between the open position and the closed position, the accommodation cavity can provide protection for the opening and closing door 60 in the open position, and facilitate to improve the aesthetics of the whole grouting material preparation device in the unused state, and further optimize the structure design of the whole device.

[0098] In some possible embodiments, continuing to refer to Figure 17The body 10 is provided with a limiting groove 14, which extends along the movement path of the opening and closing door 60. The bottom of the opening and closing door 60 is movably arranged in the limiting groove 14. For example, the bottom of the opening and closing door 60 can be slidably matched or rolled with the limiting groove 14.

[0099] When the opening and closing door 60 moves along a predetermined movement path between the open position and the closed position, the bottom of the opening and closing door 60 is always in the limiting groove 14, thereby improving the stability of the opening and closing door 60 during the movement through the limiting of the limiting groove 14.

[0100] In some possible embodiments, combined with Figure 18 As shown in the figure, when the movement path of the opening and closing door 60 is an arc path, the opening and closing door 60 can further include two arc-shaped door bodies 61. For example, the two door bodies 61 can each adopt a quarter-circular arc structure, and when the two door bodies 61 are both in the open position or the closed position, they just form a semicircular opening and closing door 60.

[0101] The two doors 61 can move between the closed position and the open position in opposite directions along the movement path. In other words, the access opening of the accommodating space 12 is opened or closed by the two doors 61 moving in opposite directions.

[0102] Specifically, assuming that both doors 61 are in the following state in the initial state: Figure 18 On this basis, when the fixing assembly 20 moves upward, one of the door bodies 61 rotates clockwise from the open position to the closed position along the movement path, and the other door body 61 rotates counterclockwise from the open position to the closed position along the movement path; when the fixing assembly 20 moves upward to the target position, the two door bodies 61 just arrive at the same time. Figure 19 The closed position shown is to close the access opening together by the cooperation of the two door bodies 61. When the fixing assembly 20 moves downward, the two door bodies 61 can move in opposite directions to open the access opening at the same time.

[0103] It can be understood that the design of the two door bodies 61, on the one hand, is conducive to reducing the time required to fully open or close the access port, and on the other hand, it can divide the total movement stroke required for the opening and closing door 60 into the two door bodies 61, so that the two door bodies 61 can realize the opening or closing of the access port with a smaller movement stroke, thereby helping to reduce the movement stroke of the fixing component 20, so as to reduce the volume of the entire grouting material device in the height direction.

[0104] Furthermore, the driving assembly 50 may be constructed in the following manner to simultaneously provide the power required for the movement of the fixing assembly 20 and the two door bodies 61 of the opening and closing door 60 .

[0105] Combine Figure 18 As shown, the drive assembly 50 may include a screw 51, a first ring gear 52, a second ring gear 53, and a drive motor 54. The screw 51 is rotatably disposed in a height direction, for example, within a receiving cavity of the housing 10. The fixing assembly 20 engages with the screw 51 in a driving manner, specifically through a threaded drive, to convert the rotational motion of the screw 51 into linear motion along the axis of the screw 51.

[0106] Exemplarily, the fixing assembly 20 may further include a connecting portion 21 and a fixing portion 22. The connecting portion 21 may be threadedly connected to the screw 51, and the connecting portion 21 may be slidably engaged with the body 10 so that the connecting portion 21 can slide in the height direction. The fixing portion 22 is disposed on the connecting portion 21, specifically at the end of the connecting portion 21 facing away from the screw 51, and the mixing container 40 is positioned on the fixing portion 22. With this design, when the screw 51 rotates, the connecting portion 21 can drive the fixing portion 22 and the mixing container 40 to move in the height direction based on the principle of threaded transmission.

[0107] The first gear ring 52 and the second gear ring 53 are both coaxially disposed with the stirring member 30. In other words, the centers of the first gear ring 52 and the second gear ring 53 coincide with the center of the arc-shaped path of the opening and closing door 60. Furthermore, the first gear ring 52 and the second gear ring 53 are both rotatably disposed on the housing 10, for example, within the housing cavity of the housing 10.

[0108] The first gear ring 52, the second gear ring 53, and the screw rod 51 are connected by a gear transmission structure 55, so that the first gear ring 52 and the second gear ring 53 can rotate synchronously with the screw rod 51, and the first gear ring 52 and the second gear ring 53 rotate in opposite directions. The two door bodies 61 are respectively connected to the first gear ring 52 and the second gear ring 53.

[0109] The drive motor 54 is connected to the screw rod 51 to drive the screw rod 51 to rotate. For example, the drawings of the present invention show a situation where the output end of the drive motor 54 is directly connected to the screw rod 51. Of course, the drive motor 54 can also have other ways of connecting to the screw rod 51, as long as it can drive the screw rod 51 to rotate.

[0110] Based on the above setting, when the driving motor 54 drives the screw rod 51 to rotate forward, the fixed assembly 20 will move upward along the height direction based on the screw transmission principle, and in the process, the first gear ring 52 and the second gear ring 53 will rotate reversely with the center of the arc path as the center, so as to drive the two door bodies 61 to move from the open position to the closed position in opposite directions through the first gear ring 52 and the second gear ring 53 respectively. Correspondingly, when the driving motor 54 drives the screw rod 51 to rotate reversely, the fixed assembly 20 will move downward along the height direction, and in the process, the first gear ring 52 and the second gear ring 53 will drive the two door bodies 61 to move from the closed position to the open position in opposite directions respectively.

[0111] It is worth noting that with the above setting, only the tooth number ratio between each gear in the gear transmission structure 55 and between the gear and each gear ring needs to be reasonably set, so that each gear ring can only rotate a small angle under the condition that the screw rod 51 rotates multiple turns, so that the fixed assembly 20 can smoothly reciprocate along the height direction by a predetermined distance, and each door body 61 can smoothly move between the open position and the closed position.

[0112] Moreover, the driving assembly 50 with the above structure can further improve the stability of each door body 61 in the movement process through gear transmission, and the fixed assembly 20 is driven to move by the screw transmission mechanism, which is conducive to more accurate control of the position of the fixed assembly 20 in the height direction.

[0113] Further, as shown in Figure 19 The gear transmission structure 55 can include a rotatable central gear 551, a first transmission gear 552, a second transmission gear 553, and a third transmission gear 554. The central gear 551 is coaxially arranged with the two gear rings, that is, the axis of the central gear 551 coincides with the center of the arc path of the opening and closing door 60. The first transmission gear 552 is coaxially arranged with the screw rod 51 and is engaged with the central gear 551. The second transmission gear 553 is engaged with the second gear ring 53 and the central gear 551 respectively, and the third transmission gear 554 is engaged with the second transmission gear 553 and the first gear ring 52 respectively.

[0114] In this way, when the screw rod 51 rotates, the first transmission gear 552 rotates the central gear 551, the central gear 551 rotates the second transmission gear 553, so that the second ring gear 53 rotates synchronously and in the same direction with the second transmission gear 553. Correspondingly, the second transmission gear 553 also rotates the third transmission gear 554, so that the first ring gear 52 rotates synchronously and in the same direction with the third transmission gear 554, and the rotation direction of the second ring gear 53 is opposite to that of the first ring gear 52. This design can realize the transmission among the screw rod 51, the first ring gear 52 and the second ring gear 53 with less gears, and realize the rotation of the first ring gear 52 and the second ring gear 53 in opposite directions.

[0115] In some possible embodiments, the fixing portion 22 for positioning the stirring container 40 can further be an electromagnet. The stirring container 40 can be made of a magnetic material. When the electromagnet is powered, the stirring container 40 is magnetically attracted and fixed on the electromagnet. Exemplarily, the magnetic material can be ferritic stainless steel or martensitic stainless steel, so that the stirring container 40 can be attracted by the electromagnet, and the strength and corrosion resistance of the stirring container 40 are also considered.

[0116] By using the electromagnet as the fixing portion 22, the stability of the stirring container 40 after being fixed and the convenience of disassembling the stirring container 40 are improved.

[0117] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A grouting material, characterized in that: include: Dead-burned magnesia, phosphate, borax, ultrafine fly ash and mixing water; Among them, the magnesium-phosphorus mass ratio of the grouting material is 3; the water-binder ratio of the grouting material is 0.18; the sand-binder ratio of the grouting material is 0.8; the borax content is 4% of the mass of the dead-burned magnesium oxide; and the ultrafine fly ash content is 5% of the total mass of the dead-burned magnesium oxide, the phosphate and the borax.

2. The grouting material according to claim 1, characterized in that The temperature of the mixing water is 40°C.

3. The grouting material according to claim 1, characterized in that The phosphate is ammonium dihydrogen phosphate.

4. A grouting material preparation device for preparing the grouting material according to any one of claims 1 to 3, characterized in that: include: The body defines a receiving space having a take-in and put-out opening; A fixed component is disposed in the accommodating space and can reciprocate along the height direction; a stirring component, disposed in the accommodating space and located above the fixing component; A stirring container is positioned on the fixed assembly; the opening of the stirring container faces the stirring component; an opening and closing door configured to move along a predetermined movement path between a closed position for closing the access opening and an open position for opening the access opening; The drive assembly is configured to simultaneously provide the power required for movement to the fixed assembly and the opening and closing door, so that: when the fixed assembly moves upward, the opening and closing door moves from the open position to the closed position; when the fixed assembly moves downward, the opening and closing door moves from the closed position to the open position.

5. The grouting material preparation device according to claim 4, characterized in that: When the opening and closing door is in the closed position, the accommodating space is in a sealed state.

6. The grouting material preparation device according to claim 4, characterized in that: The motion path is an arc path, and the center of the arc path is located on the axis of the stirring component.

7. The grouting material preparation device according to claim 6, characterized in that: The opening and closing door includes two arc-shaped door bodies; the two door bodies can move between the closing position and the opening position in opposite directions along the movement path.

8. The grouting material preparation device according to claim 7, characterized in that: The drive assembly includes: The screw is rotatably arranged along the height direction; the fixing assembly is driven and cooperated with the screw to convert the rotational motion of the screw into its own linear motion along the axial direction of the screw; The first gear ring and the second gear ring are both coaxially arranged with the stirring component; the first gear ring, the second gear ring and the screw are connected by a gear transmission structure, so that the first gear ring and the second gear ring rotate synchronously with the screw, and the rotation directions of the first gear ring and the second gear ring are opposite; the two door bodies are respectively connected to the first gear ring and the second gear ring; A driving motor is connected to the screw rod to drive the screw rod to rotate.

9. The grouting material preparation device according to claim 4, characterized in that: The interior of the machine body is provided with a housing cavity, and the housing cavity is provided with an escape opening which is communicated with the housing space and for the opening and closing door to pass through; Wherein, when the opening and closing door is in the open position, the opening and closing door is hidden in the accommodating cavity.

10. The grouting material preparation device according to claim 4, characterized in that: The machine body is provided with a limiting groove, which extends along the movement path; the bottom of the opening and closing door is movably arranged in the limiting groove.

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