A precise grouting control system

Abstract

A precise grouting control system is used to reconfigure the original slurry according to the actual grouting slurry density requirements, and accurately inject the configured slurry into the formation at the system preset flow rate and pressure according to the grouting construction requirements, including a host computer, a display and a PLC logic controller connected to the host computer, and a collection unit and an execution unit connected to the PLC logic controller; the execution unit controls the slurry feeding unit, the slurry mixing unit, the grouting unit and the return slurry unit to coordinate the slurry mixing. The present application realizes slurry mixing and grouting in an automated manner throughout the entire grouting process, and can monitor and collect parameters of the entire grouting process to ensure that the grouting slurry density and pressure match the preset plan with high execution accuracy; at the same time, it can maximize the reuse of qualified slurry, greatly reducing the slurry investment cost.

Description

Technical Field

[0001] The present invention relates to the field of water conservancy and hydropower foundation treatment equipment systems, in particular to the field of infrastructure grouting and delivery systems, and specifically to a precise grouting control system. Background Art

[0002] Among the types of modern water conservancy and hydropower foundation treatment construction, foundation grouting projects account for a large proportion. The construction process of grouting projects can be roughly divided into two major processes: drilling and grouting. Specifically for grouting construction, its main process links are: slurry preparation, slurry storage, slurry transportation, secondary slurry preparation, slurry injection into the formation, and quality control in these processes.

[0003] There is a necessary grouting process before foundation treatment grouting, that is, the required slurry density is prepared by adding raw slurry to clean water. Traditional slurry preparation equipment is manual filling and mechanical stirring, which has low slurry preparation efficiency and high labor intensity.

[0004] The grouting station at the construction site of the foundation treatment grouting project is often far away from the grouting station and the grouting station. There is no special equipment to monitor the original slurry transported to the grouting station through pipelines over long distances. Because after each slurry delivery or pipeline cleaning, a small amount of slurry and flushing water mixture will be left in the pipeline. When the slurry is delivered for the second time, the remaining mixture in the pipeline will be sent out and enter the grouting station, which will cause pollution to the original slurry or instability in the data, which does not meet the precise slurrying goal proposed by the contemporary era.

[0005] Traditional slurry mixing stations have a double-layer mixing barrel structure or a single mixing barrel structure, but most designs install the mixing motor and reducer directly on the top of the mixing barrel. The structural parts and the mixing barrel are an integral whole. This structure will cause some vibrations in the mixing barrel when the motor is working, thereby affecting the sensor on the mixing barrel and increasing the error.

[0006] At present, the idea of ​​grouting system has been proposed in the market, but there is no system for grouting cement slurry used in foundation treatment construction. How to monitor the original slurry, how to monitor the slurry returned underground after grouting, and how to integrate these functions into one device? At present, there is no specific implementation method and existing equipment.

[0007] To sum up, after analyzing the shortcomings of existing equipment, we have studied the integrated slurry mixing system with monitoring function and its implementation method, with the aim of solving the above-mentioned problems, realizing the automation of slurry mixing and improving the monitoring function, ensuring the quality of slurry mixing, and promoting the degree of automation of foundation treatment construction equipment. Summary of the invention

[0008] In order to solve the technical problems of poor accuracy and low efficiency of traditional manual grouting in the prior art, and uneven density caused by slurry sedimentation during a long grouting process, the present application provides a precise grouting control system that can completely replace manual operations for grouting with higher efficiency; double dosage of slurry and clean water in each route is performed through weighing sensors and flow meters to ensure the accuracy of slurry delivery, so that the final grouting quality can be implemented according to the preset construction plan. Furthermore, the system is creatively provided with a return grouting unit and a stirring unit different from the prior art, so that the utilization rate and accuracy of the slurry in the whole process have substantial breakthroughs and significant improvements compared with the prior art.

[0009] In order to achieve the above purpose, the technical solution adopted in this application is:

[0010] Before explaining the working principle of this system, the applicant first briefly describes the use background of this system and the functions and complete processes of the upstream and downstream systems. Foundation grouting projects are very common in water conservancy and hydropower foundation treatment. Its main process links include: slurry preparation → slurry storage → slurry transportation → secondary slurry preparation → slurry injection into the formation. Among them,

[0011] Preparation of slurry: The preparation of slurry is completed by a slurry making station or slurry making system, in which solidified powders such as cement of a specific grade are mixed with water in a specific ratio to prepare a high-concentration slurry, commonly known as raw slurry.

[0012] Storage and transportation of slurry: In the prior art, slurry is mainly transported through slurry pipelines by coordination and manual operation of workers at upstream and downstream nodes where slurry needs to be transported; the technical solution provided in this embodiment replaces the existing manual slurry transportation process.

[0013] Secondary grouting and slurry injection: Grouting and grouting are generally completed by equipment in grouting stations and grouting stations. In the existing technology, the mainstream is still manual operation for grouting, and the control of grouting pressure and flow rate still relies on the experience and judgment of the operator; and grouting mainly relies on equipment to control the mixing ratio of original slurry and water to achieve control of the density of secondary grouting.

[0014] After explaining the above-mentioned foundation grouting engineering process flow, the following will further elaborate on how the automatic grouting system provided in this application can achieve precise and automatic grouting / delivery.

[0015] The grouting system described in this application is intended to replace the manual operation process of "secondary grouting and grouting" mentioned above, so as to achieve the purpose of reducing manpower and increasing efficiency, parameter collection and precision control. Specifically:

[0016] A precise grouting control system is used for reconfiguring the original slurry according to the actual grouting slurry density requirement, and accurately injecting the configured slurry into the formation at the system preset flow rate and pressure according to the grouting construction requirements, comprising a host computer, a display and a PLC logic controller connected to the host computer for communication, and an acquisition unit and an execution unit connected to the PLC logic controller for communication; the execution unit controls the slurry feeding unit, the slurry matching unit, the grouting unit and the return slurry unit to coordinate the slurry distribution; the density information, flow rate information and the like involved in the entire system are fed back to the PLC logic controller through the acquisition unit, and further sent to the host computer for processing and display; at the same time, after comparing the system preset parameters, the logic operation output result is output and an execution instruction is issued to the execution unit for execution according to the system preset. It is worth noting that the preset parameters of the system mentioned above specifically refer to the actual geological conditions of different construction sites during the entire grouting process, and are determined after the density of the grouting slurry is determined after exploration by the Institute of Geological Exploration and other units; the specific parameters are customized manually, and the specific parameters involved are not the content that the control system described in this application requires protection and disclosure. The above explanations are only used to provide conditions for a better understanding of the control system described in this application.

[0017] The acquisition unit includes a raw slurry density meter, a grouting flow meter, and a return slurry flow meter; they are respectively used to collect and obtain the density value of the raw slurry entering the system to determine whether the raw slurry entering the system meets the conditions for secondary slurry preparation and facilitate the subsequent receiving or abandoning operations; the grouting flow meter is used to count the cumulative volume of slurry for grouting, which is generally measured in liters, and the return slurry flow meter is used to count the cumulative volume of returned slurry, and the actual amount of slurry injected into the formation is obtained by calculating the difference between the grouting slurry volume and the return slurry volume.

[0018] The execution unit includes a second raw pulp three-way valve, a raw pulp barrel discharge valve, a pulp distribution barrel discharge valve, a return pulp distribution three-way valve, a pulp discharge valve and a clean water control valve;

[0019] The pulp feeding unit comprises a raw pulp inlet connected to the pulping station, and a raw pulp density meter and a second raw pulp three-way valve connected in sequence. The PLC logic controller controls the second raw pulp three-way valve to respectively introduce the raw pulp into the raw pulp barrel or into the abandoned pulp pipe according to whether the density value detected and sent by the raw pulp density meter belongs to the preset qualified raw pulp density value range;

[0020] The slurry preparation unit includes a slurry preparation barrel, a slurry feeding mechanism and a water inlet mechanism. The slurry feeding mechanism includes a slurry discharge port arranged at the bottom of the raw slurry barrel and connected through the raw slurry barrel slurry discharge valve. The water inlet mechanism includes a water supply pipe connected to a water source, and a clean water control valve arranged on the water supply pipe for controlling the clean water supply amount. The grouting unit includes a grouting barrel, a slurry preparation barrel slurry discharge valve arranged at the bottom of the slurry preparation barrel and used to connect the slurry preparation barrel and the grouting barrel; a grouting pipe is arranged at the bottom of the grouting barrel, and a slurry discharge valve, a grouting flowmeter and a grouting pump are arranged on the grouting pipe in sequence along the slurry conveying direction; when the raw slurry from the slurry making station enters the slurry feeding unit through the slurry feeding port, it first passes through the raw slurry density meter to detect the raw slurry density value, and the PLC logic controller reads the raw slurry density value detected by the raw slurry density meter in real time and compares it with the preset raw slurry density value range. If the raw pulp density value obtained by the detection is within the preset raw pulp density value range, the system determines that the raw pulp at this time meets the pulp feeding conditions, and the second raw pulp three-way valve will guide the raw pulp into the raw pulp barrel; if the raw pulp density value obtained by the detection is lower than or higher than the preset raw pulp density value range, the system determines that the raw pulp at this time does not meet the pulp feeding conditions, and the second raw pulp three-way valve will guide the raw pulp into the discarded pulp pipe, and the raw pulp feeding at this time will not be allowed. The beneficial technical effect of the pulp feeding unit is to distinguish and screen the incoming pulp, and only allow the slurry that meets the system preset to enter the raw pulp barrel, otherwise the slurry will be discarded, avoiding the uncontrollable or unqualified quality of the subsequent slurry preparation due to the entry of unqualified raw pulp into the system; thus realizing the reliability of slurry control from the source, and laying a solid foundation for subsequent accurate slurry preparation and grouting. Since the density of the slurry used in actual grouting will be much lower than the density of the raw pulp, after accurately controlling the density of the raw pulp, the slurry of the specified density can be calculated according to the slurry-water mixing ratio, and the preset slurry density can be obtained by sufficient stirring. The feeding of raw slurry and clean water is controlled by the instructions sent by the PLC logic controller to the slurry feeding mechanism and the water feeding mechanism respectively, so as to achieve the mixing of raw slurry and clean water in a preset proportion, and then fully stirred by the stirring unit to obtain the slurry after secondary slurry preparation, that is, the grouting slurry.

[0021] The slurry prepared by the slurry preparation unit enters the grouting barrel through the slurry discharge valve of the slurry preparation barrel. When grouting is required, the slurry discharge valve is opened and the slurry is pumped into the formation through the grouting pipe and the grouting pump through the grouting flow meter.

[0022] The return slurry unit includes a return slurry pipe for collecting return slurry from the formation, and a pressure controller and a return slurry flowmeter arranged on the return slurry pipe in sequence along the return slurry flow direction, and a return slurry distribution three-way valve that respectively connects the grouting bucket and the abandoned slurry pipe. The return slurry unit is a mechanism for collecting and redistributing return slurry from the formation. Its working principle is: it is connected with the formation return slurry port through the return slurry pipe, so that the formation return slurry enters the return slurry unit through the return slurry pipe. Since the return slurry unit is provided with a pressure controller, when the return slurry pressure is less than or equal to the pressure controller, the return slurry will not pass through; on the contrary, when the return slurry pressure is greater than the pressure controller, the return slurry will pass through the pressure controller and the return slurry flow rate is counted by the return slurry flowmeter, and finally the return slurry is introduced into the abandoned slurry pipe by the return slurry distribution three-way valve. The slurry can be abandoned or returned to the grouting barrel for recycling; the return slurry distribution three-way valve corresponding to the abandonment and recycling is controlled by the preset logic of the PLC logic controller. Generally, after the geological conditions of the previous project exploration, the front-stage return slurry flow value is preset as unqualified slurry. When the actual return slurry flow value is greater than the preset abandonment slurry flow value, the subsequent return slurry will be assumed to be qualified return slurry, which will no longer be mixed with other impurities or moisture; at this time, the PLC logic controller will send a reversing instruction to the return slurry distribution three-way valve, so that the return slurry distribution three-way valve will guide the return slurry into the grouting barrel for reuse. The setting of the return slurry unit takes into account the control of the grouting formation pressure and the reuse of the return slurry, thereby reducing the slurry input cost, and also takes into account the quality screening of the return slurry, ensuring the quality of the injection slurry.

[0023] The stirring unit is a stirring device that is independently or integrally arranged in the raw pulp barrel and the pulp preparation barrel for stirring the raw pulp and / or preparing the pulp. The stirring unit is used to maintain the uniformity of the pulp density in the raw pulp barrel and the pulp preparation barrel, and is also a commonly used homogenization method in the existing pulp preparation process, which will not be described in detail.

[0024] As the preferred technical solution of the present application, specifically, the grouting system further includes a circulation detection unit, which is composed of a circulation pump and a grouting density meter interconnected through a circulation pipeline, the inlet of the circulation pump is connected to the inlet of the grouting valve through a pipeline, and the outlet of the grouting density meter is connected to the grouting barrel through a pipeline; the grouting density meter is communicatively connected to the PLC logic controller. The functions of the circulation detection unit include the following two: first, the slurry in the grouting barrel is circulated by the circulation pump to achieve vibration-free homogenization; second, since the pipeline inlet of the circulation detection unit is connected to the grouting valve, that is, the slurry is taken out of the grouting valve, the density value information of the grouting slurry corresponding to any time period can be obtained through the density detection of the grouting density meter, which provides accurate and reliable data reference for the subsequent evaluation of the entire grouting project. It is worth mentioning that the grouting density meter must be installed on the grouting pipeline of the grouting valve. Since the slurry flow direction here is irreversible, the detected data conforms to the objective fact of the actual grouting slurry density, which is more accurate and reliable than the existing value taken in the barrel. For the subsequent grouting project evaluation, it provides a reliable data basis for the playback, analysis and prediction of the grouting data and the project effect evaluation.

[0025] Preferably, the slurry inlet unit further comprises a first raw slurry three-way valve arranged between the raw slurry inlet and the raw slurry density meter, and the first raw slurry three-way valve selectively conducts the raw slurry density meter or is used to connect the bypass branch of another slurry inlet unit. When the slurry preparation system has a slurry preparation task, the first raw slurry three-way valve conducts the raw slurry inlet and the raw slurry density meter, that is, the raw slurry is introduced into the slurry inlet unit for slurry preparation; when the slurry preparation system has no slurry preparation task, the first raw slurry three-way valve introduces the raw slurry into the bypass branch, and the bypass branch seems to have a simple structure, but it has outstanding substantial characteristics when combined with the slurry preparation system; specifically, when the slurry preparation system has no slurry preparation task, the bypass branch is connected to another slurry preparation system. Similarly, according to the actual project construction situation, multiple slurry preparation systems can be connected in theory without limit; this improvement does not bring changes to the slurry preparation task and process of the slurry preparation system itself, but it has a huge beneficial effect on the coordination between the slurry preparation, slurry delivery and slurry preparation between the slurry preparation station and the slurry preparation station. In the prior art, the pipelines between the pulping station / slurry delivery station and the pulping station are often connected by one-to-one connection or unified transmission branch connection. No matter which method is adopted, more pipelines will be generated between the pulping station and the pulping station, increasing the direct cost of pipeline installation and investment; and the more bends and branches in the main pipeline, the easier it will be to cause pipeline blockage, increase system stability risks or increase flushing costs. The above structure only requires one pipeline between the pulping station and the pulping station to realize the joint operation of multiple pulping systems, which can greatly save the transportation cost in the entire pulping, pulping and pulping process.

[0026] Preferably, the pulp preparation unit further comprises a raw pulp barrel weighing sensor disposed at the bottom of the raw pulp barrel for detecting the real-time weight of the raw pulp barrel and sending the information to the PLC logic controller, and a pulp preparation barrel weighing sensor disposed at the bottom of the preparation barrel for detecting the real-time weight of the preparation barrel and sending the information to the PLC logic controller. The function and working principle of the raw pulp barrel weighing sensor are the same as those of the preparation barrel weighing sensor, but the two are aimed at different objects, namely, the raw pulp slurry in the raw pulp barrel and the preparation slurry after secondary preparation in the preparation barrel. Taking the raw pulp barrel weighing sensor as an example, it has two functions: first, it sends the actual detected weight to the PLC logic controller in real time for comparison with the system preset empty weight and full load weight, and promptly issues an alarm for empty pulp or overflow; second, it accurately balances the weight. Since the secondary pulping requires a precise mass ratio between the raw pulp and clean water, the weight of the raw pulp entering the pulping barrel can be obtained by the raw pulp mass reduced by the raw pulp weighing sensor; similarly, when the raw pulp barrel is in the pulping state, the increase in the mass of the raw pulp or clean water can also be read by collecting the increased value of the pulping barrel weighing sensor, thereby achieving the technical effect of accurate pulping.

[0027] Preferably, a return slurry density meter is provided between the return slurry pipe and the pressure controller for detecting the density of the return slurry and sending the return slurry detection density value to the PLC logic controller in real time, and the return slurry distribution three-way valve sends a control instruction to the return slurry distribution three-way valve according to whether the return slurry detection density value falls within the grouting density value range according to the comparison between the PLC logic controller and the return slurry distribution three-way valve;

[0028] When the return grouting detection density value belongs to the preset range of grouting density value, the return grouting distribution three-way valve will guide the return grouting slurry into the grouting bucket; when the return grouting detection density value does not belong to the preset range of grouting density value, the return grouting distribution three-way valve will guide the return grouting slurry into the abandoned grouting pipe.

[0029] Preferably, the stirring unit includes a driving device and a stirring device which are vertically installed above the raw pulp barrel and fixed on the main frame of the pulp preparation system. The stirring device includes a first agitator which is drivingly connected to the driving device and placed in the raw pulp barrel, and a second agitator which penetrates the bottom of the raw pulp barrel and extends into the pulp preparation barrel and rotates coaxially with the first agitator. A sliding sealing mechanism is provided between the second agitator and the bottom of the raw pulp barrel.

[0030] Preferably, it also includes an air compressor, and the first raw slurry three-way valve, the second raw slurry three-way valve, the raw slurry barrel discharge valve, the mixing slurry barrel discharge valve, the pressure controller, the return slurry distribution three-way valve, the return slurry distribution three-way valve, the clean water control valve and the slurry discharge valve are all pneumatic valves and are connected to the air compressor, and perform opening and closing actions according to the on-off instructions issued by the PLC logic controller.

[0031] Preferably, a grouting bucket weighing sensor for real-time monitoring of the weight of the grouting bucket is also provided at the bottom of the grouting bucket.

[0032] To improve the accuracy of the data, preferably, there are three weighing sensors for the original pulp barrel, the preparation barrel and the grouting barrel, and they are all installed at equal intervals on the bottom of the original pulp barrel, the preparation barrel and the grouting barrel respectively.

[0033] Beneficial Effects

[0034] This system innovatively proposes to use density sensors to monitor the density of the original slurry, solving the defect that the existing device does not monitor the quality of the original slurry. At the same time, in view of the problem that when the circulating grouting method is adopted, the density of the slurry will change during the circulation process, so that the slurry density exceeds the allowable range of change; this system innovatively proposes to use density sensors to monitor the density of the slurry in the grouting bucket in real time, and at the same time, to distinguish the density of the returned slurry, so as to avoid unqualified returned slurry from re-entering the grouting bucket, and also avoid qualified returned slurry from being discarded and wasted, so that the utilization rate of grouting resources is high and the cost-effectiveness is good.

[0035] The mixing unit of this system innovatively proposes that the reducer and motor are fixed separately on the frame, which is different from the traditional reducer and motor directly fixed on the slurry barrel, so as to avoid the vibration of the motor when working and affect the sensor on the corresponding slurry barrel.

[0036] The system also provides a grouting flow meter and a return grouting flow meter. Through the calculation of the PLC program in the PLC logic controller, the total amount of slurry injected into the formation and the real-time injection rate (the slurry parameters injected into the formation = the grouting flow meter parameters - the return grouting flow meter parameters) can be accurately known, providing real technical data for the later analysis of grouting. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative labor.

[0038] Figure 1 It is the control structure block diagram of this application;

[0039] Figure 2 It is a three-dimensional structural diagram of the present application (part of the main frame is hidden);

[0040] Figure 3 yes Figure 1 Another visual orientation axonometric drawing;

[0041] Figure 4 It is a three-dimensional structural diagram after removing the main frame;

[0042] Figure 5 yes Figure 3 Another visual orientation axonometric drawing;

[0043] Figure 6 yes Figure 3 Another visual orientation stereogram of .

[0044] In the figure: 0-air compressor; 1-raw slurry inlet; 2-first raw slurry three-way valve; 3-raw slurry density meter; 4-second raw slurry three-way valve; 5-discard slurry pipe; 6-driving device; 7-stirring device; 8-raw slurry barrel; 9-raw slurry barrel discharge valve; 10-raw slurry barrel weighing sensor; 11-mixing slurry barrel; 12-mixing slurry barrel weighing sensor; 13-mixing slurry barrel discharge valve; 14-grouting barrel; 15-grouting barrel weighing sensor; 16-return slurry pipe; 17-return slurry density meter; 18-pressure controller; 19-return slurry flowmeter; 20-return slurry distribution three-way valve; 21-grouting density meter; 22-circulating pump; 23-discharge valve; 24-grouting flowmeter; 25-grouting pipe; 26-water supply pipe; 27-clean water control valve; 28-grouting pump. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0046] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0047] Embodiment 1:

[0048] Combination Figure 1-6 A precise grouting control system is shown, which is used to perform secondary configuration of the original grout according to the actual grouting slurry density requirement, and accurately inject the configured slurry into the formation at a system preset flow rate and pressure according to the grouting construction requirements, including a host computer, a display and a PLC logic controller connected to the host computer, and a collection unit and an execution unit connected to the PLC logic controller; the execution unit controls the slurry feeding unit, the slurry matching unit, the grouting unit and the return slurry unit to coordinately distribute the slurry;

[0049] The collection unit includes a raw slurry density meter 3, a grouting flow meter 24, and a return slurry flow meter 19;

[0050] The execution unit includes a second raw pulp three-way valve 4, a raw pulp barrel discharge valve 9, a pulp distribution barrel discharge valve 13, a return pulp distribution three-way valve 20, a pulp discharge valve 23 and a clean water control valve 27;

[0051] The pulp feeding unit includes a raw pulp inlet 1 connected to the pulping station, and a raw pulp density meter 3 and a second raw pulp three-way valve 4 connected in sequence. The PLC logic controller controls the second raw pulp three-way valve 4 to respectively introduce the raw pulp into the raw pulp barrel 8 or into the abandoned pulp pipe 5 according to whether the density value detected and sent by the raw pulp density meter 3 belongs to the preset qualified raw pulp density value range; the pulp preparation unit includes a pulp preparation barrel 11, a pulp feeding mechanism and a water inlet mechanism, the pulp feeding mechanism includes a pulp discharge port arranged at the bottom of the raw pulp barrel 8 and connected through the raw pulp barrel pulp discharge valve 9, the water inlet mechanism includes a water supply pipe 26 connected to the water source, and a clean water control valve 27 arranged on the water supply pipe 26 for controlling the clean water supply amount; the grouting unit includes a grouting barrel 14, which is arranged at The bottom of the slurry preparation barrel 11 is used to connect the slurry preparation barrel 11 and the grouting barrel 14 with a slurry preparation barrel slurry discharge valve 13; the bottom of the grouting barrel 14 is provided with a grouting pipe 25, and the grouting pipe 25 is provided with a slurry discharge valve 23, a grouting flowmeter 24 and a grouting pump 28 in sequence along the slurry conveying direction; the return slurry unit includes a return slurry pipe 16 for collecting slurry returned from the formation, and a return slurry pressure gauge, a pressure controller 18 and a return slurry flowmeter 19 arranged in sequence on the return slurry pipe 16 along the return slurry flow direction, and a return slurry distribution three-way valve 20 respectively conducting the grouting barrel 14 and the abandoned slurry pipe 5; and a stirring unit, including a stirring device 7 for stirring the original slurry and / or preparing the slurry, which is independently arranged or integrated in the original slurry barrel 8 and the slurry preparation barrel 11. The density information, flow information, etc. involved in the entire system are fed back to the PLC logic controller through the acquisition unit, and further sent to the host computer for processing and display. At the same time, after comparing the system preset parameters, the logic operation output result is output and the execution instruction is sent to the execution unit for execution according to the system preset. It is worth noting that the system preset parameters mentioned above specifically refer to the actual geological conditions of different construction sites during the entire grouting process, and are determined after the density of the grouting slurry is determined after exploration by the Institute of Geological Exploration and other units; the specific parameters are manually defined, and the specific parameters involved are not the content that the control system described in this application requires protection and needs to be disclosed. The above explanations are only used to provide conditions for a better understanding of the control system described in this application.

[0052] The raw slurry density meter 3 is used to collect the density value of the raw slurry entering the system to determine whether the raw slurry entering the system meets the conditions for secondary slurry preparation and facilitate the subsequent receiving or abandoning operations; the grouting flowmeter 24 is used to count the cumulative volume of slurry for grouting, generally measured in liters, and the return slurry flowmeter 19 is used to count the cumulative volume of returned slurry. By calculating the difference between the grouting slurry volume and the return slurry volume, the actual amount of slurry injected into the formation is obtained.

[0053] When the raw pulp from the pulping station enters the pulp feeding unit through the raw pulp inlet 1, it first passes through the raw pulp density meter 3 to detect the raw pulp density value. The PLC logic controller reads the raw pulp density value detected by the raw pulp density meter 3 in real time and compares it with the preset raw pulp density value range. If the raw pulp density value obtained by the detection belongs to the preset raw pulp density value range, the system determines that the raw pulp meets the pulp feeding conditions at this time, and the second raw pulp three-way valve 4 guides the raw pulp into the raw pulp barrel 8; if the raw pulp density value obtained by the detection is lower or higher than the preset raw pulp density value range, the system determines that the raw pulp does not meet the pulp feeding conditions at this time, and the second raw pulp three-way valve 4 guides the raw pulp into the discarded pulp pipe 5, and the raw pulp feeding at this time will not be allowed. The beneficial technical effect of the slurry feeding unit is to identify and screen the incoming slurry, and only allow the slurry that meets the system preset to enter the raw slurry barrel 8, otherwise the slurry will be discarded, avoiding the uncontrollable or unqualified quality of the subsequent slurry preparation due to the entry of unqualified raw slurry into the system; thus achieving the reliability of controlling the slurry from the source, laying a solid foundation for the subsequent precise slurry preparation and grouting. Since the density of the slurry used in actual grouting will be lower than the density of the raw slurry, after the raw slurry density is accurately controlled, the slurry of the specified density can be calculated according to the slurry-water mixing ratio, and then the preset slurry density can be obtained by sufficient stirring. The feeding of raw slurry and clean water is controlled by the instructions sent by the PLC logic controller to the slurry feeding mechanism and the water inlet mechanism, respectively, so as to achieve the mixing of raw slurry and clean water according to the preset ratio, and then the stirring unit is used to fully stir to obtain the slurry after secondary slurry preparation, that is, the grouting slurry.

[0054] The slurry prepared by the slurry preparation unit enters the grouting barrel 14 through the slurry discharge valve of the slurry preparation barrel 11. When grouting is required, the slurry discharge valve is opened and the slurry is finally injected into the formation through the grouting pipe and the grouting pump 28 through the grouting flow meter.

[0055] The return slurry unit is a mechanism for collecting and redistributing the return slurry from the formation. Its working principle is: the return slurry pipe 16 is connected to the formation return slurry port, so that the formation return slurry enters the return slurry unit through the return slurry pipe. Since the return slurry unit is provided with a pressure controller 18, when the return slurry pressure is less than or equal to the pressure controller 18, the return slurry will not pass; on the contrary, when the return slurry pressure is greater than the pressure controller 18, the return slurry will pass through the pressure controller 18 and the return slurry flow rate will be counted by the return slurry flowmeter 19, and finally the return slurry will be introduced into the abandonment slurry pipe by the return slurry distribution three-way valve 20 5 to abandon the slurry or return it to the grouting barrel 14 for recycling; the return slurry distribution three-way valve 20 corresponding to the abandonment and recycling is controlled by the preset logic of the PLC logic controller. Generally, after the geological conditions of the previous project exploration, the front-stage return slurry flow rate is preset as unqualified slurry. When the actual return slurry flow rate is greater than the preset abandonment slurry flow rate, the subsequent return slurry will be assumed to be qualified return slurry, which is no longer doped with other impurities or moisture; at this time, the PLC logic controller will send a reversing instruction to the return slurry distribution three-way valve 20, so that the return slurry distribution three-way valve 20 will guide the return slurry into the grouting barrel 14 for reuse. The setting of the return slurry unit takes into account the control of the grouting formation pressure and the reuse of the return slurry, thereby reducing the slurry input cost, and also takes into account the quality screening of the return slurry, ensuring the quality of the injection slurry.

[0056] The function of the stirring unit is to maintain the uniformity of the density of the slurry in the original slurry barrel 8 and the slurry mixing barrel 11, which is also a commonly used slurry homogenization method in the existing slurry mixing process and will not be described in detail.

[0057] Embodiment 2:

[0058] As a preferred embodiment of the present application, based on the mechanism and principle of embodiment 1, further combined with the attached Figure 4The structure shown in the figure, the grouting system also includes a circulation detection unit, which is composed of a circulation pump 22 and a grouting density meter 21 that are interconnected through a circulation pipeline. The inlet of the circulation pump 22 is connected to the inlet of the grouting valve 23 through a pipeline, and the outlet of the grouting density meter 21 is connected to the grouting bucket 14 through a pipeline; the grouting density meter 21 is connected to the PLC logic controller. The functions of the circulation detection unit include the following two: first, the slurry in the grouting bucket 14 is circulated by the circulation pump 22 to achieve vibration-free homogenization; second, since the pipeline inlet of the circulation detection unit is connected to the grouting valve 23, that is, the slurry is taken out of the grouting valve 23, the density value information of the grouting slurry corresponding to any time period can be obtained through the density detection of the grouting density meter 21, which provides accurate and reliable data reference for the subsequent evaluation of the entire grouting project. It is worth mentioning that the grouting density meter 21 must be installed on the grouting pipeline of the grouting valve 23. Since the slurry flow direction here is irreversible, the detected data conforms to the objective fact of the actual grouting slurry density, which is more accurate and reliable than the existing value taken in the barrel. It provides a reliable data basis for the subsequent grouting project evaluation, the whole grouting data playback, analysis, and project effect evaluation prediction.

[0059] Embodiment 3:

[0060] On the basis of Example 1 or Example 2, the structural design is further optimized, and the Figure 2-4 As shown, specifically, the pulp feeding unit also includes a first raw pulp three-way valve 2 arranged between the raw pulp inlet 1 and the raw pulp density meter 3, and the first raw pulp three-way valve 2 selectively conducts the raw pulp density meter 3 or is used to connect the bypass branch of another pulp feeding unit.

[0061] Working principle and beneficial effects:

[0062] When the slurry matching system has a slurry matching task, the first raw slurry three-way valve 2 connects the raw slurry inlet 1 and the raw slurry density meter 3, that is, the raw slurry is introduced into the slurry inlet unit for slurry matching; when the slurry matching system has no slurry matching task, the first raw slurry three-way valve 2 introduces the raw slurry into the bypass branch pipe. The bypass branch pipe seems to have a simple structure, but it has outstanding substantial characteristics when combined with the slurry matching system; specifically, when the slurry matching system has no slurry matching task, the bypass branch pipe is connected to another slurry matching system. Similarly, according to the actual project construction situation, multiple slurry matching systems can be connected in theory without limit; this improvement does not bring about any changes to the slurry matching tasks and processes of the slurry matching system itself, but it has a huge beneficial effect on the coordination between the slurry making station and the slurry matching station, slurry delivery and slurry matching. In the prior art, the pipelines between the pulping station / slurry delivery station and the pulping station are often connected by one-to-one connection or unified transmission branch connection. No matter which method is adopted, more pipelines will be generated between the pulping station and the pulping station, increasing the direct cost of pipeline installation and investment; and the more bends and branches in the main pipeline, the easier it will be to cause pipeline blockage, increase system stability risks or increase flushing costs. The above structure only requires one pipeline between the pulping station and the pulping station to realize the joint operation of multiple pulping systems, which can greatly save the transportation cost in the entire pulping, pulping and pulping process.

[0063] In this example, as an optimization solution for slurry mixing accuracy, the slurry mixing unit also includes a raw pulp barrel weighing sensor 10 disposed at the bottom of the raw pulp barrel 8 for detecting the real-time weight of the raw pulp barrel 8 and sending the information to the PLC logic controller, and a slurry mixing barrel weighing sensor 12 disposed at the bottom of the slurry mixing barrel 11 for detecting the real-time weight of the slurry mixing barrel 11 and sending the information to the PLC logic controller. The function and working principle of the raw pulp barrel weighing sensor 10 are the same as those of the slurry mixing barrel weighing sensor 12, but the two are targeted at different objects, namely, the raw pulp slurry in the raw pulp barrel 8 and the slurry mixing slurry after secondary slurry mixing in the slurry mixing barrel 11. Taking the raw pulp barrel weighing sensor 10 as an example, it has two functions: first, it sends the actual detected weight to the PLC logic controller in real time for comparison with the empty weight and full load weight preset by the system, and promptly issues an alarm for empty pulp or overflow; second, it accurately balances the weight. Since the secondary pulping requires an accurate mass ratio between the raw pulp and the clean water, the weight of the raw pulp entering the pulping barrel 11 can be obtained by the raw pulp mass reduced by the raw pulp weighing sensor 10; similarly, when the raw pulp barrel 8 is in the pulping state, the increase in the mass of the raw pulp or clean water can also be read by collecting the increased value of the pulping barrel weighing sensor 12, thereby achieving the technical effect of accurate pulping.

[0064] Since the density of the raw pulp entering the raw pulp barrel 8 is accurately collected by the raw pulp density meter 3, when it is necessary to follow the system preset ratio, for example, the ratio of the raw pulp volume to the clean water volume V pulp: V water = 5:2, then according to v = m / ρ, it can be known that M pulp / ρ pulp: M water / ρ water = 5:2, wherein ρ pulp and ρ water are both known, and the intake of raw pulp and water can be obtained in turn through the pulp mixing barrel weighing sensor 12, until the pulp-water ratio reaches the system preset conditions and the water or pulp intake is stopped; it is worth noting that since information is obtained by weighing, the water intake time periods of raw pulp and clean water must be divided, and only one of water or pulp can be selected to enter independently, and they cannot enter the pulp mixing barrel 11 at the same time, otherwise the accurate pulp-water ratio cannot be obtained.

[0065] Embodiment 4:

[0066] Further optimization is made based on the structural principle and drawings of Example 3. A return slurry density meter 17 is provided between the return slurry pipe 16 and the pressure controller 18. The return slurry density meter 17 is used to detect the return slurry density and send the return slurry detection density value to the PLC logic controller in real time. The return slurry distribution three-way valve 20 sends a control instruction to the return slurry distribution three-way valve 20 according to whether the return slurry detection density value belongs to the grouting density value range compared by the PLC logic controller.

[0067] When the return slurry detection density value belongs to the preset range of grouting density value, the return slurry distribution three-way valve 20 guides the return slurry into the grouting barrel 14; when the return slurry detection density value does not belong to the preset range of grouting density value, the return slurry distribution three-way valve 20 guides the return slurry into the abandoned slurry pipe 5. The stirring unit includes a driving device 6 and a stirring device 7 vertically installed above the original slurry barrel 8 and fixed on the main frame of the slurry preparation system. The stirring device 7 includes a first stirrer connected to the driving device 6 and placed in the original slurry barrel 8 and a second stirrer that penetrates the bottom of the original slurry barrel 8 and extends to the slurry preparation barrel 11 and rotates coaxially with the first stirrer. A sliding sealing mechanism is provided between the second stirrer and the bottom of the original slurry barrel 8. The stirring unit in this embodiment is arranged on the main frame, and has no physical contact with the original slurry barrel 8 and the slurry preparation barrel 11. Under the driving action of the driving device 6, the vibration will not be directly transmitted to the original slurry barrel 8 and the slurry preparation barrel 11, which will fundamentally avoid the problem of data distortion of the weighing sensor caused by the vibration generated by the operation of the driving device 6. The driving device 6 can be realized by using an existing combination of a reducer and a motor.

[0068] In this embodiment, an air compressor 0 is also included. The first raw slurry three-way valve 2, the second raw slurry three-way valve 4, the raw slurry bucket slurry discharge valve 9, the slurry mixing bucket slurry discharge valve 13, the pressure controller 18, the return slurry distribution three-way valve 20, the clean water control valve 27 and the slurry discharge valve 23 are all pneumatic valves and are connected to the air compressor 0, and perform opening and closing actions according to the on-off instructions issued by the PLC logic controller.

[0069] In this embodiment, a grouting bucket weighing sensor 15 for real-time monitoring of the weight of the grouting bucket 14 is also provided at the bottom of the grouting bucket 14 .

[0070] To improve the accuracy of the data, preferably, the raw pulp barrel weighing sensor 10, the slurry barrel weighing sensor 12 and the grouting barrel weighing sensor 15 are three in number, and are installed at equal intervals on the bottom of the raw pulp barrel 8, the slurry barrel 11 and the grouting barrel 14 respectively.

[0071] Embodiment 5:

[0072] This embodiment combines the attached Figure 1-6 As shown, the entire grouting process of the present application is explained. The structural part involved in the grouting described in this embodiment is assumed to be directly connected to the outlet of the pulping station that supplies the raw slurry upstream, and does not involve the process of the first raw slurry three-way valve 2 delivering slurry to other subsequent grouting systems.

[0073] First, when the upper computer detects an empty barrel or insufficient raw pulp through the raw pulp barrel weighing sensor 10, the raw pulp passes through the raw pulp inlet 1 and the raw pulp density meter 3 sends the raw pulp density to the PLC logic controller for comparison calculation, and selects one to output different instructions for whether the slurry is qualified / unqualified.

[0074] If the density of the raw pulp slurry is qualified, an opening signal is sent to the first solenoid valve, the second solenoid valve is closed, the first raw pulp three-way valve 2 is opened and introduced into the raw pulp barrel 8; if it is unqualified, it is introduced into the discarded pulp pipe 5 for discarding until the density is qualified; the first raw pulp three-way valve 2 feeds back the actual opening position to the PLC logic controller, and stops if it meets the preset opening position; if it does not meet the requirements, the instruction is reissued.

[0075] After the raw pulp enters the raw pulp barrel 8 and the liquid level meets the preset maximum value, the liquid level control can be determined by the raw pulp barrel weighing sensor through the total mass, or the liquid level sensor can be installed to directly collect data. When secondary slurry mixing is required, the PLC logic controller sends opening and closing instructions to the third solenoid valve and the fourth solenoid valve respectively, opens the raw pulp barrel slurry discharge valve 9, so that the raw pulp flows into the slurry mixing barrel 11 under the action of gravity and its own pressure until it reaches the system preset raw pulp value and then closes. The amount entering the slurry mixing barrel 11 is realized by weighing the slurry mixing barrel weighing sensor 12; then open the clean water control valve 27 and inject clean water under the control of the thirteenth and fourteenth solenoid valves until the ratio of raw pulp to clean water reaches the preset conditions, as described in Example 3 for details. After stirring evenly, open the slurry mixing barrel slurry discharge valve 13 controlled by the seventh and eighth solenoid valves, and put the slurry after secondary slurry mixing into the grouting barrel 14 for standby use.

[0076] When grouting is required, the slurry discharge valve 23 is opened and controlled by the eleventh and twelfth electromagnetic valves. Of course, the following can also be used: Figure 4The manual valve shown in the figure will reduce the overall automation level of the present application. And send a grouting instruction to the grouting pump 28 to perform grouting. It is worth noting that the present application combines Figure 1 The first solenoid valve to the fourteenth solenoid valve shown in the figure respectively control a two-way or three-way valve in pairs, and have the same working principle. They are existing valves with position feedback on the market. The electrical principle of the valve itself is not created by this application, so the internal working principle and structure are not described in detail. There are many kinds of existing technologies, such as rack pneumatic valves, diaphragm pneumatic valves, and piston pneumatic valves for replacement. The gas source is provided by the air compressor 0, and the on and off of the gas is realized by the PLC logic controller by controlling the first solenoid valve to the fourteenth solenoid valve.

[0077] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A precise grouting control system, which is used to reconfigure the original grout according to the actual grouting slurry density requirements, and accurately inject the configured slurry into the formation at the system preset flow rate and pressure according to the grouting construction requirements. Features: It includes a host computer, a display and a PLC logic controller connected to the host computer, and a collection unit and an execution unit connected to the PLC logic controller; the execution unit controls the slurry feeding unit, the slurry mixing unit, the grouting unit and the slurry return unit to coordinately distribute the slurry; The collection unit comprises a grouting flow meter (24), a return slurry flow meter (19), and an original slurry density meter (3); The execution unit comprises a second raw pulp three-way valve (4), a raw pulp bucket discharge valve (9), a slurry distribution bucket discharge valve (13), a return pulp distribution three-way valve (20), a slurry discharge valve (23) and a clean water control valve (27); The pulp feeding unit comprises a raw pulp inlet (1) connected to the pulping station, and a raw pulp density meter (3) and a second raw pulp three-way valve (4) connected in sequence. The PLC logic controller controls the second raw pulp three-way valve (4) to respectively guide the raw pulp into the raw pulp barrel (8) or into the discarded pulp pipe (5) according to whether the density value detected and sent by the raw pulp density meter (3) belongs to a preset qualified raw pulp density value range; the pulp preparation unit comprises a pulp preparation barrel (11), a pulp feeding mechanism and a water inlet mechanism, the pulp feeding mechanism comprises a pulp discharge port arranged at the bottom of the raw pulp barrel (8) and connected through a raw pulp barrel discharge valve (9), the water inlet mechanism comprises a water supply pipe (26) connected to a water source, and a clean water control valve (27) arranged on the water supply pipe (26) for controlling the clean water supply amount; the grouting unit comprises a grouting barrel (14) arranged at the pulp preparation barrel (11) ) at the bottom thereof, a grouting barrel discharge valve (13) for connecting the grouting barrel (11) and the grouting barrel (14); a grouting pipe (25) is arranged at the bottom of the grouting barrel (14), and a grouting valve (23), a grouting flowmeter (24) and a grouting pump (28) are arranged on the grouting pipe (25) in sequence along the grouting direction; the return grouting unit comprises a return grouting pipe (16) for collecting grouting returned from the formation, and a return grouting pressure gauge, a pressure controller (18) and a return grouting flowmeter (19) are arranged on the return grouting pipe (16) in sequence along the return grouting flow direction, and a return grouting distribution three-way valve (20) for respectively connecting the grouting barrel (14) and the abandoned grouting pipe (5); and a stirring unit, comprising a stirring device (7) for stirring the original slurry and / or preparing the slurry and being independently arranged or integrally arranged in the original slurry barrel (8) and the grouting barrel (11); If the raw pulp density value obtained by detection is within the preset raw pulp density value range, the system determines that the raw pulp meets the pulp feeding conditions at this time, and the second raw pulp three-way valve (4) guides the raw pulp into the raw pulp barrel (8); if the raw pulp density value obtained by detection is lower than or higher than the preset raw pulp density value range, the system determines that the raw pulp does not meet the pulp feeding conditions at this time, and the second raw pulp three-way valve (4) guides the raw pulp into the discarded pulp pipe (5), and the raw pulp feeding at this time will not be allowed; when the return slurry pressure is less than or equal to the pressure controller (18), the return slurry will not pass; on the contrary, when the return slurry pressure is greater than the pressure controller (18), the return slurry will pass through the pressure controller (18) and the return slurry flow rate will be counted by the return slurry flowmeter (19), and finally the return slurry distribution three-way valve (20) guides the return slurry into the discarded pulp pipe (5) for discarding or returns to the grouting barrel (14) for recycling.

2. A precise grouting control system according to claim 1, Features The invention also comprises a circulation detection unit, the circulation detection unit comprising a circulation pump (22) and a grouting density meter (21) which are interconnected through a circulation pipeline, the inlet of the circulation pump (22) is connected to the inlet of the slurry discharge valve (23) through a pipeline, and the outlet of the grouting density meter (21) is connected to the grouting bucket (14) through a pipeline; the grouting density meter (21) is communicatively connected to a PLC logic controller; the slurry feed unit also comprises a first raw slurry three-way valve (2) arranged between the raw slurry feed port (1) and the raw slurry density meter (3), the first raw slurry three-way valve (2) selectively conducting the raw slurry density meter (3) or being used to connect to a bypass branch pipe of another slurry feed unit.

3. A precise grouting control system according to claim 2, Features The pulp mixing unit further comprises a pulp bucket weighing sensor (10) arranged at the bottom of the pulp bucket (8) for detecting the real-time weight of the pulp bucket (8) and sending the information to the PLC logic controller, and a pulp mixing bucket weighing sensor (12) arranged at the bottom of the pulp mixing bucket (11) for detecting the real-time weight of the pulp mixing bucket (11) and sending the information to the PLC logic controller.

4. A precise grouting control system according to claim 3, Features A return slurry density meter (17) is also provided between the return slurry pipe (16) and the pressure controller (18) for detecting the density of the return slurry and sending the return slurry detection density value to the PLC logic controller in real time. The return slurry distribution three-way valve (20) sends a control instruction to the return slurry distribution three-way valve (20) according to whether the return slurry detection density value belongs to the grouting density value range according to the comparison of the PLC logic controller; when the return slurry detection density value belongs to the preset grouting density value range, the return slurry distribution three-way valve (20) guides the return slurry into the grouting bucket (14); when the return slurry detection density value does not belong to the preset grouting density value range, the return slurry distribution three-way valve (20) guides the return slurry into the waste slurry pipe (5).

5. A precise grouting control system according to claim 4, Features The stirring unit comprises a driving device (6) and a stirring device (7) which are vertically mounted above the raw pulp barrel (8) and fixed on the main frame of the pulp preparation system. The stirring device (7) comprises a first stirrer which is connected to the driving device (6) and is placed in the raw pulp barrel (8), and a second stirrer which passes through the bottom of the raw pulp barrel (8) and extends into the pulp preparation barrel (11) and rotates coaxially with the first stirrer. A sliding sealing mechanism is provided between the second stirrer and the bottom of the raw pulp barrel (8).

6. A precise grouting control system according to claim 5, Features: It also includes an air compressor (0), wherein the first raw pulp three-way valve (2), the second raw pulp three-way valve (4), the raw pulp barrel discharge valve (9), the slurry mixing barrel discharge valve (13), the pressure controller (18), the return pulp distribution three-way valve (20), the clean water control valve (27) and the pulp discharge valve (23) are all pneumatic valves and are connected to the air compressor (0), and perform opening and closing actions according to the on-off instructions issued by the PLC logic controller.

7. A precise grouting control system according to claim 6, Features: A grouting bucket weighing sensor (15) for real-time monitoring of the weight of the grouting bucket (14) is also provided at the bottom of the grouting bucket (14).

8. A precise grouting control system according to claim 7, Features: The raw pulp barrel weighing sensor (10), the preparation barrel weighing sensor (12) and the grouting barrel weighing sensor (15) are all three in number and are installed at equal intervals on the bottom of the raw pulp barrel (8), the preparation barrel (11) and the grouting barrel (14).

9. A precise grouting control system according to claim 8, Features: The second raw pulp three-way valve (4), the raw pulp barrel discharge valve (9), the slurry mixing barrel discharge valve (13), the return pulp distribution three-way valve (20), the slurry discharge valve (23) and the clean water control valve (27) are all controlled to open / close by two solenoid valves respectively, and the execution position status of opening / closing is fed back to the PLC logic controller.

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