Cement stabilized base material premixing device and method

Abstract

The application discloses a cement stabilized base material premixing device, which comprises a cement paste stirrer and a cement mortar stirrer; the cement paste stirrer comprises a cement paste stirring bin, a stirring paddle and an ultrasonic wave generating device; the ultrasonic wave generating device is arranged at the bottom of the cement paste stirring bin; the stirring paddle comprises a driving shaft and a stirring paddle blade; the stirring paddle blade is arranged at the bottom of the driving shaft; a filter screen for dispersing materials is arranged at the upper portion of the stirring paddle blade; a cement neat paste outlet is arranged on the bottom surface of the cement paste stirring bin; and a water inlet is arranged on the top surface of the cement paste stirring bin. The application further discloses a cement stabilized base material premixing method using the cement stabilized base material premixing device. In the mixing process of the cement stabilized base material, the cement paste stirrer and the cement mortar stirrer are added, the cement particle agglomeration phenomenon is improved through multiple mixing steps, and the uniformity of the cement stabilized base material is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of road base construction, and particularly relates to a cement stabilized base material premixing device and method. BACKGROUND

[0002] In the process of road base construction, the mixing of cement stabilized materials plays a crucial role in the construction quality. The conventional mixing method is to put the weighed cement, fly ash, admixture and aggregates into a mixing bin, and the material is discharged after mixing for about 15 seconds. In this mixing method, the cement dispersion may not be uniform, and there may be agglomeration of cement particles, which causes the performance of the cement hydration interface transition zone in the mixture to differ significantly, and further leads to uneven strength of the cement stabilized materials. In addition, it may also exacerbate the dry shrinkage of the cement stabilized materials, thereby causing cracking. At the same time, the uneven dispersion of cement may also reduce the uniformity of the cement stabilized mixture as a whole, so it is necessary to improve the uniformity of the cement dispersion in the cement stabilized materials. The existing process for improving the uniformity of the cement stabilized base material mainly includes secondary mixing and vibration mixing. Although the mixing time is increased to improve the uniformity of the mixture, it may not fundamentally solve the agglomeration of cement particles. SUMMARY

[0003] The present application aims to overcome the deficiencies in the prior art, and provides a cement stabilized base material premixing device and method. In the mixing process of the cement stabilized base material, a cement slurry mixer and a cement mortar mixer are added to improve the agglomeration of cement particles and improve the uniformity of the cement stabilized base material.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present application is to provide a cement stabilized base material premixing device, which comprises: a cement slurry mixer and a cement mortar mixer, the cement slurry mixer and the cement mortar mixer are connected, and the cement slurry mixer is used to transport the mixed cement slurry to the cement mortar mixer; the cement slurry mixer comprises a cement slurry mixing bin, a stirring paddle and an ultrasonic generating device for providing ultrasonic vibration, the ultrasonic generating device is arranged at the bottom of the cement slurry mixing bin, the stirring paddle comprises a driving shaft and a stirring paddle blade, the bottom end of the driving shaft is arranged vertically at the center position of the bottom surface of the cement slurry mixing bin, the top end of the driving shaft penetrates through the top surface of the cement slurry mixing bin, the stirring paddle blade is arranged at the bottom of the driving shaft, the upper part of the stirring paddle blade is provided with a filter screen for dispersing materials, the bottom surface of the cement slurry mixing bin is provided with a cement neat slurry outlet, and the top surface of the cement slurry mixing bin is provided with a water inlet.

[0005] Furthermore, the cement mortar mixer includes a cement mortar mixing chamber, a cement slurry spraying device, and a mixing shaft. The cement slurry spraying device is located at the top of the cement mortar mixing chamber, and a cement mortar outlet is located at the bottom of the cement mortar mixing chamber. The mixing shaft includes a rotating shaft and a mixing rod. The upper part of the rotating shaft is located at the center of the cement slurry spraying device, and the mixing rod is located at the lower part of the rotating shaft. The rotating shaft can drive the mixing rod to rotate around the center of the cement mortar mixing chamber. Multiple mixing blades are arranged along the axial direction of the mixing rod, and all of the multiple mixing blades can rotate around the axial direction of the mixing rod.

[0006] Furthermore, the cement slurry spraying device is an annular cylindrical cavity, the upper part of which is connected to the cement slurry outlet via a cement slurry conveying pipe, and the bottom of which is provided with multiple cement slurry injection ports.

[0007] Furthermore, the stirring rod is a vibrating stirring rod, and there are multiple stirring rods. All of the multiple stirring rods are vertically arranged in the cement mortar mixing chamber, and the top of each of the multiple stirring rods is connected to the lower part of the rotating shaft. The multiple stirring blades on two adjacent stirring rods are arranged in an alternating vertical arrangement.

[0008] Furthermore, the lower part of the rotating shaft includes four support shafts, which are arranged in a cross shape around the rotating shaft, and each support shaft is provided with at least one stirring rod.

[0009] Furthermore, each of the plurality of stirring blades includes two rectangular blades arranged in a cross configuration, and the blade surfaces of the two rectangular blades are perpendicular to the rotation direction of the plurality of stirring blades.

[0010] Furthermore, the top surface of the cement slurry mixing chamber is provided with a cement feeding port and other material feeding ports, and the upper part of the cement mortar mixing chamber is provided with a fine aggregate feeding port.

[0011] Furthermore, there are multiple water inlets, which are evenly distributed along the edge of the top surface inside the cement slurry mixing chamber.

[0012] A method for premixing cement-stabilized base course materials using a cement-stabilized base course material premixing device includes the following steps:

[0013] Step 1: Weigh the coarse aggregate, fine aggregate, water, cement and other materials required for premixing into their respective weighing hoppers.

[0014] Step two, preparing cement slurry: adding the cement, water and other materials weighed in step one into the cement slurry mixer, and starting the ultrasonic generator to stir to form the cement slurry;

[0015] Step three, preparing cement mortar: sending the cement slurry obtained in step two into the cement mortar mixer, and stirring together with the fine aggregate weighed in step one to form the cement mortar;

[0016] Step four, sending the cement mortar obtained in step three into the cement stabilized base material mixer to stir with the coarse aggregate to prepare the cement stabilized base material.

[0017] Further, the step two, the step three and the step four are synchronously stirred.

[0018] Compared with the prior art, the present application has the following advantages:

[0019] 1. By increasing the mixing times of the cement, the present application reduces the agglomeration of the cement particles, so that the cement slurry, the cement mortar and the cement stabilized base material can be synchronously formed, the continuity and efficiency of the operation are ensured, and the uniformity of the mixing of the cement stabilized base material in the mixing station is significantly improved.

[0020] 2. The present application can play a vibration role while stirring, so that the cement particles are fully dispersed under the action of the mechanical vibration and the ultrasonic vibration, the mixing quality of the cement is improved, and the road performance of the cement stabilized base material is significantly improved.

[0021] 3. The cement slurry mixer and the cement mortar mixer provided by the present application are simple in structure and convenient to operate, the obtained cement slurry and cement mortar are mixed with the aggregate by the pressurized spraying mode, the contact area is increased, and the mixing of the mixture is more uniform.

[0022] 4. The oblong mixing blade and the stirring blade are used in the present application, which can play a strong stirring and shearing role in the cement stirring process, fully mix and stir the cement and the aggregate, and the material is not easy to be left on the blade surface.

[0023] The present application will be further described in detail by the accompanying drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 Fig. 1 is a structural schematic view of the cement slurry mixer in the present application.

[0025] Figure 2 Fig. 2 is a structural schematic view of another perspective of the cement slurry mixer in the present application.

[0026] Figure 3The figure is a structural schematic diagram of the cement mortar mixer in the application.

[0027] Figure 4 The figure is a connecting schematic diagram of the cement stabilized base material premixing device used in the cement stabilized base material premixing method in the application.

[0028] Explanation of reference numerals:

[0029] 1 - cement slurry mixer; 2 - cement mortar mixer; 3 - double-shaft forced vibration mixer;

[0030]

[0031] 4 - cement slurry conveying pipeline; 10 - cement slurry mixing bin; 11 - driving shaft;

[0032] 12 - mixing paddle; 13 - filter screen; 14 - cement neat paste outlet;

[0033] 15 - cement feeding port; 16 - ultrasonic wave generating device; 17 - water injection port;

[0034] 18 - other material feeding port; 20 - cement mortar mixing bin; 21 - cement mortar sprinkling device;

[0035] 22 - rotating shaft; 23 - supporting shaft; 24 - mixing rod;

[0036] 25 - mixing blade; 26 - fine aggregate feeding port; 27 - cement mortar outlet;

[0037] 28 - cement slurry injection port; 5 - weighing and pressurizing device. DETAILED DESCRIPTION

[0038] Embodiments of the present application will be described in more detail by referring to the attached drawings. Although certain embodiments of the present application are shown in the drawings, it is understood that the present application can be implemented in various forms and should not be interpreted as being limited to the embodiments set forth herein, but rather these embodiments are provided so as to make the present application more thorough and complete. It is understood that the drawings and embodiments of the present application are for exemplary purposes only and should not be construed as limiting the scope of protection of the present application.

[0039] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with embodiments.

[0040] As Figures 1-4 ​As shown, the cement stabilized base material premixing device is used for premixing cement stabilized base material, and the cement stabilized base material includes cement stabilized macadam, cement emulsified asphalt stabilized macadam and the like, and comprises a cement paste mixer 1 and a cement mortar mixer 2, wherein the cement paste mixer 1 and the cement mortar mixer 2 are connected, the cement paste mixer 1 is used for mixing cement, fly ash, cement paste additive and water to form cement paste and conveying the mixed cement paste to the cement mortar mixer 2;

[0041] The cement paste mixer 1 comprises a cement paste mixing bin 10, a stirring paddle and an ultrasonic generating device 16 for providing ultrasonic vibration, the ultrasonic generating device 16 is arranged at the bottom of the cement paste mixing bin 10, the ultrasonic generating device comprises an ultrasonic generator and an ultrasonic transducer, the ultrasonic transducer generates ultrasonic mechanical vibration under the control of the ultrasonic generator to crush cement agglomerated particles in the cement paste. The stirring paddle comprises a driving shaft 11 and a stirring paddle blade 12, the bottom end of the driving shaft 11 is arranged vertically at the center position of the bottom surface of the cement paste mixing bin 10, the top end of the driving shaft 11 penetrates through the top surface of the cement paste mixing bin 10, a driving motor is arranged in the driving shaft 11, the driving motor can drive the stirring paddle blade 12 to rotate, the stirring paddle blade 12 is arranged at the bottom of the driving shaft 11, the stirring paddle blade 12 is an inclined paddle blade, which can push the cement paste to surge during the stirring process, and the stirring paddle blade 12 can continue to rotate to push the cement paste out after the stirring of the cement paste reaches the premixing time, and the uniformity of the cement mixing can be improved under the stirring action of the ultrasonic vibration and the stirring paddle blade 12. A filter screen 13 for dispersing materials is arranged at the upper portion of the stirring paddle blade 12, the filter screen 13 is fixedly arranged on the driving shaft 11 and can rotate with the driving shaft 11, under the action of the ultrasonic vibration, the cement and other materials can be dispersed without caking and can smoothly pass through the screen when the cement and other materials are put in, and the filter screen can still play a role in dispersing materials when the cement paste is stirred, and the filter screen is immersed in the cement paste. A cement neat paste outlet 14 is arranged on the bottom surface of the cement paste mixing bin 10, the cement neat paste outlet 14 is in a closed state when the cement paste is stirred, and a water inlet 17 is arranged on the top surface of the cement paste mixing bin 10.

[0042] The cement mortar mixer 2 is used for mixing fine aggregate and the cement paste to make cement mortar, and comprises a cement mortar mixing bin 20, a cement paste spraying device 21 and a stirring shaft. The cement paste spraying device 21 is arranged at the top of the cement mortar mixing bin 20, the bottom of the cement mortar mixing bin 20 is provided with a cement mortar discharge port 27, the cement mortar discharge port 27 is in a closed state during cement mortar mixing, the stirring shaft comprises a rotating shaft 22 and a stirring rod 24, the upper part of the rotating shaft 22 is arranged at the center position of the cement paste spraying device 21, the stirring rod 24 is arranged at the lower part of the rotating shaft 22 and the rotating shaft 22 can drive the stirring rod 24 to rotate around the center of the cement mortar mixing bin 20, a plurality of stirring blades 25 are arranged along the axis direction of the stirring rod 24 and can rotate around the axis of the stirring rod 24, in the embodiment, the number of stirring blades 22 on the stirring rod 24 is three, and the three stirring blades 22 are uniformly distributed at equal intervals. A driving motor is arranged in the rotating shaft 22, and the driving motor can drive the rotating shaft 22 and the stirring blades 25 to rotate.

[0043] The cement paste spraying device 21 is an annular cylindrical cavity, the upper part of the annular cylindrical cavity is connected with the cement neat paste outlet 14 through a cement paste conveying pipeline 4, the cement paste conveying pipeline 4 is provided with a cement paste weighing and pressurizing device 5, the weighing and pressurizing device comprises a weighing device and a pressurizing device, the pressurizing device can be a booster pump, and the weighing device can be a gravity sensor, the bottom of the annular cylindrical cavity is provided with a plurality of cement paste injection ports 28, the prepared cement paste of the cement paste mixer 1 enters the cement paste conveying pipeline 4 through the cement neat paste outlet 14, enters the cement paste spraying device 21 after being weighed and pressurized, and is sprayed into the cement mortar mixing bin 20 through the plurality of cement paste injection ports 28, so that the contact area between the cement paste and the fine aggregate is increased and the stirring efficiency is improved.

[0044] The stirring rod 24 is a vibrating stirring rod. The vibrating stirring rod is added with the action of vibration in the process of stirring. The cement particles are uniformly dispersed under the action of vibration. The vibration can purify the surface of fine aggregate, improve the adhesion of cement and fine aggregate, and improve the compressive performance of the cement mortar formed by stirring. The number of the stirring rod 24 is multiple. The multiple stirring rods 24 are vertically arranged in the cement mortar stirring bin 20. The top ends of the multiple stirring rods 24 are connected with the lower part of the rotating shaft 22. The multiple stirring blades 25 on the adjacent two stirring rods 24 are staggered in the vertical direction. In the process of rotating the rotating shaft 22, the multiple stirring rods 24 at the lower part of the rotating shaft 22 rotate in the circular direction in the cement mortar stirring bin 20. At the same time, the stirring blades 25 on the stirring rod 24 rotate in the horizontal direction around the axis of the stirring rod 24, forming a small circulating liquid vortex, and the stirring is more uniform, so that the cement slurry and the fine aggregate can be fully mixed to form the cement mortar.

[0045] The lower part of the rotating shaft 22 includes four support shafts 23. The four support shafts 23 are arranged in a cross shape with the rotating shaft 22 as the center. At least one stirring rod 24 is arranged on each support shaft 23. The stirring rod 24 is arranged in the cement mortar stirring bin 20 through the support shaft 23. The distribution is more uniform, and the stirring area is larger. In this embodiment, two stirring rods 24 are arranged on each support shaft 23.

[0046] In the process of preparing the cement mortar, the fine aggregate needs to be put in. To ensure the uniformity of the mixing of the cement particles and the fine aggregate, the multiple stirring blades 25 each include two cross-shaped rectangular blades. The length of the rectangular blade is 20 cm. The blade surfaces of the two rectangular blades are perpendicular to the rotating direction of the multiple stirring blades 25. The stirring blades 25 can produce strong stirring, shearing and cutting effects in the stirring process, so that the cement particles and the fine aggregate can be fully mixed and stirred uniformly. At the same time, the blade surface is not easy to have material residues.

[0047] The top surface of the cement slurry stirring bin 10 is provided with a cement feeding port 15 and other material feeding ports 18. The cement feeding port 15 is used for feeding cement. The other material feeding ports 18 are used for feeding fly ash and additives required for preparing the cement mortar. The upper part of the cement mortar stirring bin 20 is provided with a fine aggregate feeding port 26. The fine aggregate feeding port 26 is arranged at the edge of the upper part of the cement mortar stirring bin 20 to avoid affecting the spraying of the cement slurry.

[0048] To increase the contact area of water, cement and fly ash, the number of the water injection ports 17 is multiple. The multiple water injection ports 17 are uniformly distributed along the edge of the top surface of the cement slurry stirring bin 10. The water is pressurized and injected into the cement slurry stirring bin 10 in the form of spraying, so that the cement slurry formed by stirring is more uniform.

[0049] A cement stabilized base material premixing method using a cement stabilized base material premixing device, comprising the following steps:

[0050] Step one, the coarse aggregate, fine aggregate, water, cement and other materials required for premixing are respectively sent into the respective measuring hopper for weighing, the other materials include fly ash, additives, emulsified asphalt and the like;

[0051] Step two, preparing cement slurry: the cement, water and other materials weighed in step one are added into the cement slurry mixer 1, and the ultrasonic wave generating device 16 is turned on to stir to form cement slurry;

[0052] In this step, the water refers to part of the water used for preparing the cement stabilized base material, in the process of preparing the cement stabilized base material by the premixing method of the present application, the water used for the cement stabilized base material is divided into two parts, one part is the water required for premixing, and the other part is the water required for formal stirring, considering that if the water used for the cement stabilized base material is put into the cement slurry preparation process at one time, the water-cement ratio is about 1, the cement slurry body is relatively dilute, and separation may occur during the cement slurry conveying process, therefore, the amount of water with a water-cement ratio of 0.6-0.7 is selected to be added during the preparation of the cement slurry; if emulsified asphalt is required to be added, the amount of water should be controlled to be 0.6-0.7 of the mass of cement / (water+emulsified asphalt).

[0053] Step three, preparing cement mortar: the cement slurry obtained in step two is weighed and pressurized, and then is sent into the cement mortar mixer 2 in a pressurized spraying manner, and is stirred with the fine aggregate weighed in step one to form cement mortar;

[0054] Step four, the cement mortar obtained in step three is sent into the cement stabilized base material mixer in a spraying manner to stir and prepare the cement stabilized base material with the coarse aggregate. The cement stabilized base material mixer refers to the double-shaft forced vibration mixer 3. Before the cement mortar is added into the double-shaft forced vibration mixer 3 in this step, the coarse aggregate required for preparing the cement stabilized base material and the water required for formal stirring are sequentially put into the double-shaft forced vibration mixer 3, and the coarse aggregate is conveyed into the double-shaft forced vibration mixer 3 by a belt.

[0055] Specifically, step two, step three and step four are simultaneously stirred, and the stirring time is 20 seconds. The cement slurry mixer 1, the cement mortar mixer 2 and the double-shaft forced vibration mixer 3 can be controlled and driven by an external console, so that the cement slurry, the cement mortar and the cement stabilized base material can be simultaneously formed, the continuity and efficiency of the operation are ensured, and the quality of the finished cement stabilized base material is ensured.

[0056] The above is only the preferred embodiment of the present application, and does not limit the present application, and any simple modification, change and equivalent structure change of the above embodiment according to the technical essence of the present application are still within the protection scope of the technical scheme of the present application.

Claims

1. A cement stabilized base material premixing device, characterized by, The utility model relates to a cement slurry mixer (1) and cement mortar mixer (2) are connected, the cement slurry mixer (1) is used for delivering mixed cement slurry for the cement mortar mixer (2). The cement slurry mixer (1) comprises a cement slurry mixing bin (10), a stirring paddle and an ultrasonic generating device (16) for providing ultrasonic vibration, the ultrasonic generating device (16) is arranged at the bottom of the cement slurry mixing bin (10), the stirring paddle comprises a driving shaft (11) and a stirring paddle blade (12), the bottom end of the driving shaft (11) is vertically arranged at the center position of the bottom surface of the cement slurry mixing bin (10), the top end of the driving shaft (11) penetrates through the top surface of the cement slurry mixing bin (10), the stirring paddle blade (12) is arranged at the bottom of the driving shaft (11), the upper part of the stirring paddle blade (12) is provided with a filter screen (13) for dispersing materials, the bottom surface of the cement slurry mixing bin (10) is provided with a cement neat slurry outlet (14), and the top surface of the cement slurry mixing bin (10) is provided with a water inlet (17). The cement mortar mixer (2) comprises a cement mortar mixing bin (20), a cement slurry spraying device (21) and a stirring shaft, the cement slurry spraying device (21) is arranged at the top of the cement mortar mixing bin (20), the bottom of the cement mortar mixing bin (20) is provided with a cement mortar discharge port (27), the stirring shaft comprises a rotating shaft (22) and a stirring rod (24), the upper part of the rotating shaft (22) is arranged at the center position of the cement slurry spraying device (21), the stirring rod (24) is arranged at the lower part of the rotating shaft (22), the rotating shaft (22) can drive the stirring rod (24) to rotate around the center of the cement mortar mixing bin (20), a plurality of stirring blades (25) are arranged along the axis direction of the stirring rod (24), and the plurality of stirring blades (25) can rotate around the axis of the stirring rod (24). The stirring rod (24) is a vibrating stirring rod, the number of the stirring rods (24) is multiple, the plurality of stirring rods (24) are vertically arranged in the cement mortar mixing bin (20), the top ends of the plurality of stirring rods (24) are connected with the lower part of the rotating shaft (22), and the plurality of stirring blades (25) on adjacent two stirring rods (24) are distributed in an up-and-down staggered mode. The cement slurry spraying device (21) is an annular cylindrical cavity, the upper part of the annular cylindrical cavity is connected with the cement neat slurry outlet (14) through a cement slurry conveying pipeline (4), and the bottom of the annular cylindrical cavity is provided with a plurality of cement slurry inlets (28).

2. A cement stabilized base material premixing device according to claim 1, characterized in that, The lower part of the rotating shaft (22) comprises four supporting shafts (23), the four supporting shafts (23) are arranged in a cross mode with the rotating shaft (22) as the center, and at least one stirring rod (24) is arranged on each supporting shaft (23).

3. A cement stabilized base material premixing device according to claim 2, characterized in that, ​ 4. A cement stabilized base material premixing device according to claim 2, wherein The plurality of stirring blades (25) each comprises two rectangular blades arranged in cross, and the blade surfaces of the two rectangular blades are perpendicular to the rotation direction of the plurality of stirring blades (25).

5. The cement stabilized base material premixing device according to claim 1, characterized in that, The top surface of the cement slurry mixing bin (10) is provided with a cement feeding port (15) and other material feeding ports (18), and the upper portion of the cement mortar mixing bin (20) is provided with a fine aggregate feeding port (26).

6. A cement stabilized base material premixing device according to claim 1, characterized in that, The number of the water injection ports (17) is multiple, and the multiple water injection ports (17) are uniformly distributed along the edge of the inner top surface of the cement slurry mixing bin (10).

7. A cement stabilized base material premixing method using the cement stabilized base material premixing device according to claim 1, characterized by, The method comprises the following steps: Step one, the required coarse aggregate, fine aggregate, water, cement and other materials are respectively sent into the respective weighing hoppers for weighing; Step two, preparing cement slurry: the cement, water and other materials weighed in step one are added into the cement slurry mixer (1), and the ultrasonic generating device (16) is turned on to stir to form cement slurry; Step three, preparing cement mortar: the cement slurry obtained in step two is sent into the cement mortar mixer (2), and the fine aggregate weighed in step one is stirred together to form cement mortar; Step four, the cement mortar obtained in step three is sent into the cement stabilized base material mixer to stir with the coarse aggregate to prepare cement stabilized base material.

8. A method of pre-mixing a cement-stabilised base material according to claim 7, characterised in that, The step two, the step three and the step four are simultaneously stirred.

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