Automatic preparation device for grouting slurry

Abstract

The utility model discloses an automatic preparation device for grouting slurry. The device comprises a control system (10), stirring equipment (20), a stirring barrel (30), a weighing device (40), a fixing device (50), an automatic water injection device (60), an automatic ash feeding device (70) and a liquid level sensor (80), under the control of the control system, the stirring equipment stirs materials in the stirring drum; the automatic water injection device and the automatic ash feeding device respectively inject water and ash into the mixing drum under the control of the control system; the weighing device is arranged below the stirring barrel and is used for weighing the stirring barrel and materials in the stirring barrel; the liquid level sensor is arranged on the inner wall of the mixing drum or the lower surface of the upper cover and is used for measuring the liquid level height of materials in the mixing drum. The device can detect and utilize residual slurry in the mixing drum, a plurality of slurry storage tanks do not need to be configured, waste is avoided, and meanwhile, accurate and automatic configuration of the slurry is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of grouting, in particular to an automatic preparation device for grouting slurry. Background Art

[0002] As a common and important engineering measure in the foundation treatment of hydraulic structures, grouting technology has been widely used in the anti-seepage and reinforcement treatment of dam foundations. According to the "Technical Specifications for Cement Grouting Construction of Hydraulic Structures" (SL / T62-2020), when multi-level water-cement ratio slurry is used for grouting, the slurry change should comply with the following principles: ① When the injection volume of a certain level of slurry has reached more than 300L, or the grouting time has reached 30min, and the grouting pressure and injection rate have not changed or the changes are not significant, the water-cement ratio should be changed to a higher level. ② When the injection rate is greater than 30L / min, it can be thickened by leaps and bounds according to the specific situation. In addition to the above-mentioned changes in the water-cement ratio, when sealing the hole, it is also necessary to reduce the water-cement ratio and change the water-cement ratio.

[0003] When the water-binder ratio needs to be changed, there is often an unknown volume or weight of cement slurry with the previous water-binder ratio left in the mixing drum. In order to obtain the next level of cement slurry with an accurate water-binder ratio, the cement slurry with the previous water-binder ratio in the mixing drum needs to be discarded and the cement slurry with the next level of water-binder ratio needs to be reconfigured. This not only causes a lot of waste, but also pollutes the environment. In reality, in order to save costs, the construction party directly adds water or cement to the mixing drum containing the slurry with the previous water-binder ratio based on experience. The water-binder ratio of the obtained cement slurry is inaccurate and very random. In order to change this situation, some construction units have set up multiple slurry storage tanks, each of which is filled with cement slurry with a water-cement ratio. When the slurry water-cement ratio needs to be changed, it is sufficient to switch to the corresponding slurry storage tank. The advantage of this is that the slurry water-cement ratio is accurate, but the setting of multiple slurry storage tanks occupies a large area, which is not suitable for some working environments with narrow construction space. Moreover, when multiple slurry storage tanks are set up, the cement slurry in some slurry storage tanks cannot be used for a long time, and the cement particles in the cement slurry undergo a relatively sufficient hydration reaction. The quality of the anti-seepage body formed by grouting with this cement slurry is poor. Utility Model Content

[0004] In order to overcome the deficiencies in the prior art, the utility model aims to provide an automated preparation device and method for grouting slurry, which can detect the unknown volume or weight of the previous level water-cement ratio slurry remaining in the mixing drum, and make full use of the slurry to configure the slurry with the required water-cement ratio concentration for the next level, without the need to configure multiple slurry storage tanks, thereby avoiding the waste of cement slurry and realizing the accurate and automated configuration of slurry / slurry.

[0005] More specifically, one aspect of the utility model provides an automated preparation device for grouting slurry, comprising: a control system (10), a stirring device (20), a stirring drum (30), a weighing device (40), a fixing device (50), an automatic water injection device (60), an automatic ash feeding device (70), and a liquid level sensor (80);

[0006] The control system (10) is electrically connected to the stirring device (20), the weighing device (40), the automatic water injection device (60) and the automatic ash feeding device (70) respectively;

[0007] The stirring device (20) comprises a motor (21), a driving rod (22) and a blade (23); one end of the driving rod is connected to the motor, and the other end passes through a through hole in an upper cover (31) of the stirring drum and is inserted into the stirring drum (30); the blade is fixedly arranged on the driving rod; the motor (21) is fixed above the stirring drum (30) by a fixing device (50); under the control of a control system (10), the motor drives the driving rod, thereby driving the blade to stir the material in the stirring drum;

[0008] The mixing drum (30) is provided with a water inlet (32) and an ash inlet (33), and an automatic water injection device (60) and an automatic ash injection device (70) respectively inject water and ash into the mixing drum (30) through the water inlet and the ash inlet under the control of a control system;

[0009] The weighing device (40) is arranged below the mixing drum (30) and is used to weigh the mixing drum and the material therein; the liquid level sensor (80) is arranged on the inner wall of the mixing drum or the lower surface of the upper cover (31) and is used to measure the liquid level height of the material in the mixing drum.

[0010] According to the implementation scheme of the utility model, the control system (10) can calculate the water and ash contained in the residual material according to the weight of the residual material in the mixing drum, and control the feed amount of the automatic water injection device (60) and the automatic ash feeding device (70) based on this.

[0011] According to an embodiment of the utility model, a stirring paddle (34) is formed on the inner wall of the stirring drum (30).

[0012] According to an embodiment of the present utility model, the control system (10) is a PLC control system.

[0013] According to an embodiment of the present invention, a discharge port (35) is formed at the bottom of the mixing drum (30).

[0014] According to an embodiment of the present invention, a discharge port (35) is formed at the bottom of the mixing drum (30).

[0015] According to an embodiment of the utility model, the automatic ash feeding device (70) is a spiral ash feeding device, and the weighing device (40) is an electronic scale.

[0016] According to another aspect of the utility model, there is provided an automated preparation method for grouting slurry, comprising:

[0017] 1) After grouting, the weight of the remaining first slurry in the mixing drum of the slurry making device is accurately weighed using a weighing device;

[0018] 2) transmitting the weight data of the remaining slurry to the control system, and the control system calculates the weight of ash and water contained in the remaining first slurry according to the weight of the remaining first slurry and the density of the remaining first slurry;

[0019] 3) inject a certain amount of ash into the mixing drum, and use a weighing device to accurately weigh the weight of the material contained in the mixing drum;

[0020] 4) transmitting the weight data of the material to the control system, the control system calculates the weight of the ash contained in the material according to the weight of the material and the weight of the water contained in the remaining first slurry, and then calculates the weight of the water required to be added to prepare the second slurry according to the second water-binder ratio and the weight of the water contained in the remaining first slurry;

[0021] 5) The control system sends an instruction to the automatic water injection device, and the automatic water injection device accurately injects the amount of water required for preparing the second slurry into the mixing drum according to the instruction; and

[0022] 6) Stirring and slurrying to obtain a second slurry.

[0023] According to an embodiment of the utility model, the automated grouting method for grouting further comprises a step of preparing a first slurry before step 1), and the step of preparing the first slurry comprises:

[0024] A certain amount of ash is injected into the mixing drum of the pulping device, and the weight of the injected ash is accurately weighed using a weighing device;

[0025] The weight data of the ash is transmitted to the control system, and the control system calculates the weight of water required to prepare the first slurry according to the first water-binder ratio;

[0026] The control system sends a command to the automatic water injection device, and the automatic water injection device accurately injects the amount of water required for preparing the first slurry into the mixing drum according to the command; and

[0027] The first slurry is obtained by stirring and slurrying.

[0028] According to an embodiment of the present utility model, in step 2), the volume of the remaining first slurry is measured by a level meter arranged in the mixing drum, and then the density of the remaining first slurry is calculated based on the weight and volume of the remaining first slurry.

[0029] According to an embodiment of the utility model, the automated preparation method for grouting slurry further comprises a step of reviewing the concentration of the obtained first slurry or the second slurry.

[0030] According to an embodiment of the present invention, in step 2), the density of the remaining first slurry is determined according to the first water-binder ratio.

[0031] According to an embodiment of the present invention, in step 2), a densitometer is used to measure the density of the remaining first slurry.

[0032] According to the implementation scheme of the present utility model, in step 3), the control system controls the automatic ash feeding device to inject a certain amount of ash into the mixing drum.

[0033] Compared with the prior art, the implementation scheme of the utility model can achieve beneficial technical effects:

[0034] 1) The utility model adopts the method of adding ash roughly first and then adding water accurately, combined with the weight method, thereby achieving a more accurate water-cement ratio;

[0035] 2) The utility model can detect the unknown volume or weight of the previous level water-cement ratio slurry remaining in the mixing drum, and make full use of the slurry to configure the slurry with the water-cement ratio concentration required for the next level. Therefore, on the basis of achieving accurate quantification of the water-cement ratio, the material is fully utilized and material waste and environmental pollution are avoided;

[0036] 3) The utility model does not need to configure multiple slurry storage tanks, which solves the problem that multiple slurry storage tanks are not suitable for some working environments with narrow construction work spaces, avoids the negative impact on the quality of cement slurry caused by long-term storage of cement slurry in the slurry storage tanks, and also saves costs;

[0037] 4) The utility model adopts a stirring paddle to achieve sufficient stirring, and at the same time can also reduce the situation where only one-way stirring blades are set to cause large fluctuations in the liquid level and even cause slurry overflow;

[0038] 5) The utility model can realize automatic slurry configuration, thereby reducing the interference of human operation to the greatest extent, saving labor costs and improving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of a process of an automated grouting method for grouting according to an embodiment of the utility model;

[0040] Figure 2 A schematic diagram of the structure of an automated preparation device for grouting slurry according to an embodiment of the utility model; and

[0041] Figure 3 The present invention is a control system block diagram of an automatic preparation device for grouting slurry according to an embodiment of the present invention. DETAILED DESCRIPTION

[0042] The present invention will be described more clearly and completely below in conjunction with the accompanying drawings and specific implementation schemes, but it should be understood that the scope of the present invention is not limited thereto, but is intended to facilitate understanding by those of ordinary skill in the art.

[0043] Figure 1 The figure is a schematic diagram of a process of an automated grouting method for grouting according to an embodiment of the present utility model. Figure 2 It is a schematic structural diagram of an automated preparation device for grouting slurry according to an embodiment of the utility model. Figure 3 The present invention is a control system block diagram of an automatic preparation device for grouting slurry according to an embodiment of the present invention.

[0044] refer to Figure 2 and Figure 3 The automated preparation device for grouting slurry of the embodiment may include a control system (10), a stirring device (20), a stirring drum (30), a weighing device (40), a fixing device (50), an automatic water injection device (60) and an automatic ash feeding device (70).

[0045] As shown in the figure, the control system (10) can be electrically connected to the mixing device (20), the weighing device (40), the automatic water injection device (60) and the automatic ash feeding device (70), for example, by wired or wireless connection, to control the operation of these components respectively. The control system (10) can be, for example, a PLC control system. PLC is a digital operation electronic system designed for use in an industrial environment. It uses a programmable memory to store instructions for performing operations such as logical operations, sequential control, timing, counting and arithmetic operations, and controls various types of mechanical equipment or production processes through digital or analog input and output. The system is well known to those skilled in the art and will not be described in detail here.

[0046] The stirring device (20) may include a motor (21), a driving rod (22) and a blade (23). One end of the driving rod is connected to the motor, and the blade (23) is arranged at the lower part of the driving rod. As shown in the figure, multiple sets of blades can be arranged on the driving rod (22) as needed to achieve sufficient stirring. The fixing device (50) is used to fix the motor (21) of the stirring device (20). For example, the fixing device (50) can be a frame structure, which accommodates the entire stirring drum (30), and the other end of the driving rod (22) passes through the through hole in the upper cover (31) of the stirring drum and is inserted into the stirring drum (30); the motor (21) can be fixed on the top of the fixing device (50) frame structure by bolts, and thus suspended above the stirring drum (30). Under the control of the control system (10), the motor (21) drives the driving rod, thereby driving the blades to stir the materials in the stirring drum.

[0047] Referring to the accompanying drawings, a water inlet (32) and an ash inlet (33) may be provided on the side wall of the mixing drum (30), which are used to input water and ash into the mixing drum, respectively. One or more stirring paddles (34) (one is shown in the figure) may be fixedly provided on the lower side wall of the mixing drum (30), and the stirring paddles (34) may be staggered with the blades so as not to hinder the normal operation of the blades. This arrangement can achieve sufficient stirring, and at the same time can also reduce the situation where only one-way stirring blades are provided to cause large fluctuations in the liquid level, or even cause slurry overflow. In addition, a discharge port (35) may be formed at the bottom of the mixing drum (30), and the discharge port may be provided with an electromagnetic valve of an electric control switch, which is electrically connected to the control system (10), thereby realizing automatic control of the switch and the discharge.

[0048] The automatic water injection device (60) and the automatic ash feeding device (70) may be conventional feeding devices, respectively used to inject water and ash into the mixing drum (30). For example, the automatic water injection device may include a water pump, a flow meter, an electromagnetic switch valve, a single chip microcomputer, etc., and is electrically connected to the control system (10), and can accurately inject a required amount of water into the mixing drum (30) through the water inlet (32) under the control of the control system and the single chip microcomputer; the amount of water added may also be accurately controlled by a liquid level control method, that is, the amount of water is controlled by monitoring the liquid level of the water, for example, by measuring the liquid level with a laser level meter; when the liquid level reaches a preset value, the corresponding valve or pump may be closed to accurately control the amount of water added. The feeding accuracy of the automatic ash feeding device (70) may not be very high, for example, it may be a spiral conveying ash feeding device, which may include components such as spiral blades, a drive motor, a single chip microcomputer, and is electrically connected to the control system (10), and can inject a certain amount of ash into the mixing drum (30) through the ash inlet (33) under the control of the control system and the single chip microcomputer.

[0049] The weighing device (40) is arranged below the mixing drum (30) and is used to weigh the mixing drum and the materials therein and transmit the weighing data to the control system (10). The weighing device (40) may be a conventional electronic scale, and its accuracy may be selected as required. The weighing device (40) may be arranged on a fixing device (50) to provide support for the mixing drum (30).

[0050] In addition, a liquid level sensor (80) may be provided on the inner wall of the mixing drum or the lower surface of the upper cover (31) to sense the liquid level of the slurry in the mixing drum, and the volume of the slurry in the mixing drum may be calculated in combination with the shape and size of the mixing drum, such as the height and the bottom area. The liquid level sensor (80) may be, for example, a non-contact laser liquid level sensor, and is provided on the lower surface of the upper cover (31), and the position of the liquid level sensor may be such that it is not affected by other components, such as blades and stirring paddles. For example, when the mixing drum is cylindrical, the liquid level of the slurry may be measured by a laser liquid level sensor, and the volume of the slurry in the mixing drum may be calculated in combination with the height and the bottom area of ​​the cylinder, and the density of the slurry may be calculated. The liquid level sensor (80) may be electrically connected to the control system (10) in a wired or wireless manner.

[0051] In the device of the embodiment of the utility model, the control system (10) can calculate the water and ash contained in the residual material according to the weight of the residual material in the mixing drum, and control the feeding amount of the automatic water injection device (60) and the automatic ash feeding device (70) based on this, so that the material can be fully utilized to avoid waste and the slurry can be accurately and automatically configured. The device of the embodiment of the utility model can also include a display device, which can be connected to the control system (10) for displaying various detection and analysis results of the slurry.

[0052] The following is combined with Figure 1 The automated grouting method for grouting according to the embodiment of the utility model is further described in detail. Referring to the accompanying drawings, the grouting method according to the embodiment may include the following steps:

[0053] First, prepare the first slurry, use the automatic ash feeding device (70) to inject a certain amount of ash into the mixing drum of the slurry making device, and use the weighing device (40) to accurately weigh the weight of the injected ash. Here, the ash can be selected from ordinary silicate cement, composite silicate cement, etc. The approximate amount of ash to be injected can be determined according to the volume of the mixing drum, the required amount of slurry, and the first water-cement ratio, and then the control system (10) controls the automatic ash feeding device (70) to inject the approximate amount of ash into the mixing drum. Since ash is a solid material, it is difficult for general ash feeding devices such as spiral ash feeding devices to achieve accurate feeding. In the utility model, it is not necessary to use the automatic ash feeding device (70) for accurate feeding, but to use the weighing device (40) for accurate weighing.

[0054] After weighing, the weight data of the ash is transmitted to the control system (via wireless or wired transmission), and the control system calculates the weight of water required to prepare the first slurry according to the first water-binder ratio (water-cement ratio). The control system sends a command to the automatic water injection device, and the automatic water injection device accurately injects the amount of water required to prepare the first slurry into the mixing drum according to the command. Afterwards, the control system sends a command, and the motor (21) stirs and slurries. The stirring speed and time can be preset according to experience or experiments, thereby preparing the first slurry.

[0055] Afterwards, the slurry concentration can be reviewed as needed. That is, the control system can open the discharge port (35) to take out a certain sample, and then use a densitometer to measure it, or the mass and volume of the sample can be measured, and then the density of the sample can be calculated. In general, due to the precise quantification of water and ash in the method of the utility model, the density of the first slurry prepared by the method according to the implementation scheme of the utility model is equivalent to the density corresponding to the first water-binder ratio, and the density obtained by the review step will also be basically equivalent to the density corresponding to the first water-binder ratio. A certain error range, such as 0.5%, is acceptable in engineering. If the error between the density of the detected sample and the density corresponding to the predetermined first water-binder ratio exceeds the predetermined range, it can be adjusted. For example, when the water-binder ratio (water-cement ratio) is too large, the control system can control the automatic ash feeding device to add ash for rough adjustment first and then add water for fine adjustment; if the water-cement ratio is too small, the automatic water feeding device is controlled to directly add water for fine adjustment.

[0056] Finally, according to the need, the control system controls the discharge port (35) to open for grouting.

[0057] Second, after grouting, the weighing device (40) accurately weighs the weight of the first slurry remaining in the mixing drum of the slurry making device. In practice, many projects will use multi-level water-cement ratio (water-cement ratio) slurry for grouting. For example, according to the relevant standard "Technical Specifications for Cement Grouting Construction of Hydraulic Structures" (SL / T62-2020), when multi-level water-cement ratio slurry is used for grouting, the slurry change should comply with the following principles: ① When the injection volume of a certain level of slurry has reached more than 300L, or the grouting time has reached 30min, and the grouting pressure and injection rate have not changed or the changes are not significant, the first-level water-cement ratio should be changed to a thicker level. ② When the injection rate is greater than 30L / min, it can be thickened by leaps and bounds according to the specific situation. When changing the water-cement ratio, in most cases a certain amount of slurry (slurry) will remain in the mixing drum. In the method of the utility model, a weighing device (40) can be used to accurately weigh the remaining slurry to achieve subsequent full utilization and avoid waste.

[0058] Third, after weighing, the weight data of the remaining slurry is transmitted to the control system (10), and the control system calculates the weight of the ash and water contained in the remaining first slurry according to the weight of the remaining first slurry and the density of the first slurry. In this process, the density of the first slurry can be determined according to a variety of methods.

[0059] For example, the volume of the remaining first slurry can be measured by a level meter (80) disposed in the mixing drum, and then the density of the remaining first slurry can be calculated based on the weight and volume of the remaining first slurry. A relationship chart between the liquid level and the volume of the mixing drum can be prepared in advance, so that after the liquid level is measured by the level meter (80), it is transmitted to the control system (10), and the control system (10) can calculate the volume of the slurry.

[0060] For example, the density of the first slurry can also be determined based on the first water-cement ratio (water-cement ratio). During the preparation of the first slurry, the first water-cement ratio is known, and the first slurry is prepared precisely according to the first water-cement ratio. It should be understood that the density of the first slurry / remaining first slurry can be determined by comparing the water-cement ratio (water-cement ratio) and the slurry density in a pre-made / calculated chart. For example, the relationship between various water-cement ratios (ordinary Portland cement ash) and density is listed in the following table:

[0061] Cement slurry density comparison table for various water-cement ratios

[0062] Water-cement ratio 10∶1 8∶1 6∶1 5∶1 4∶1 3∶1 2∶1 Slurry density 1.065 1.082 1.107 1.127 1.156 1.204 1.292 Water-cement ratio 1.5∶1 1∶1 0.8∶1 0.7∶1 0.6∶1 0.5∶1 0.4∶1 Slurry density 1.372 1.513 1.605 1.663 1.735 1.825 1.939

[0063] The PLC controller can use linear interpolation to calculate the values ​​between the above values, thereby obtaining the density values ​​corresponding to various water-cement ratios.

[0064] For example, the density of the remaining first slurry can also be measured using a densitometer. The densitometer has no particular requirements and can be, for example, a slurry densitometer.

[0065] Fourth, a certain amount of ash is injected into the mixing drum, and the weight of the material contained in the mixing drum is accurately weighed using a weighing device. More specifically, the approximate amount of ash to be injected can be determined based on the volume of the mixing drum, the required amount of slurry (second slurry), the next level water-binder ratio, such as the second water-binder ratio, and the amount of ash in the remaining first slurry, and then the control system (10) controls the automatic ash feeding device (70) to inject the approximate amount of ash into the mixing drum. Here, it is not necessary to use the automatic ash feeding device (70) to accurately feed the material.

[0066] Fifth, the weight data of the material is transmitted to the control system, and the control system (10) accurately calculates the weight of the ash contained in the material according to the weight of the material and the weight of the water contained in the remaining first slurry, that is, the total weight of the material minus the weight of water; then, according to the second water-binder ratio and the weight of the water contained in the remaining first slurry, the weight of the water required to be added to prepare the second slurry is calculated, that is, according to the second water-binder ratio and the weight of the ash contained in the material, the required total amount of water is calculated; then, the total amount of water is subtracted from the water contained in the remaining first slurry to obtain the required water.

[0067] Sixth, the control system (10) sends a command to the automatic water injection device (60), and the automatic water injection device accurately injects the amount of water required for preparing the second slurry into the mixing drum according to the command.

[0068] Seventh, after water injection, the control system issues a command, and the motor (21) performs stirring and slurrying, and the stirring speed and time can be preset according to experience or experiment, thereby obtaining a second slurry. Afterwards, the slurry concentration can be reviewed in a similar manner to the first slurry.

[0069] In addition, according to specific needs, the above steps can be repeated to prepare a third slurry, a fourth slurry, etc.

[0070] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An automated preparation device for grouting slurry, characterized in that: include: A control system (10), a stirring device (20), a stirring drum (30), a weighing device (40), a fixing device (50), an automatic water injection device (60), an automatic ash feeding device (70), and a liquid level sensor (80); The control system (10) is electrically connected to the stirring device (20), the weighing device (40), the automatic water injection device (60) and the automatic ash feeding device (70) respectively; The stirring device (20) comprises a motor (21), a driving rod (22) and a blade (23); one end of the driving rod is connected to the motor, and the other end passes through a through hole in an upper cover (31) of the stirring drum and is inserted into the stirring drum (30); the blade is fixedly arranged on the driving rod; the motor (21) is fixed above the stirring drum (30) by a fixing device (50); under the control of a control system (10), the motor drives the driving rod, thereby driving the blade to stir the material in the stirring drum; The mixing drum (30) is provided with a water inlet (32) and an ash inlet (33), and an automatic water injection device (60) and an automatic ash injection device (70) respectively inject water and ash into the mixing drum (30) through the water inlet and the ash inlet under the control of a control system; The weighing device (40) is arranged below the mixing drum (30) and is used to weigh the mixing drum and the material therein; the liquid level sensor (80) is arranged on the inner wall of the mixing drum or the lower surface of the upper cover (31) and is used to measure the liquid level height of the material in the mixing drum.

2. The automatic preparation device for grouting slurry according to claim 1, characterized in that: A stirring paddle (34) is formed on the inner wall of the stirring drum (30).

3. The automatic preparation device for grouting slurry according to claim 1, characterized in that: The control system (10) is a PLC control system.

4. The automatic preparation device for grouting slurry according to claim 1, characterized in that: The bottom of the mixing drum (30) is formed with a discharge port (35).

5. The automatic preparation device for grouting slurry according to claim 1, characterized in that: It also includes a display device electrically connected to the control system (10).

6. The automatic preparation device for grouting slurry according to claim 1, characterized in that: The automatic ash feeding device (70) is a spiral ash feeding device, and the weighing device (40) is an electronic scale.

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