CN111851501A - Accurate grout control system that joins in marriage - Google Patents

Abstract

A precise grouting allocation control system is used for carrying out secondary allocation on primary slurry according to the actual grouting slurry density requirement and accurately injecting the allocated slurry into a stratum according to the grouting construction requirement at the flow and pressure preset by the system, and comprises an upper computer, a display and a PLC (programmable logic controller) which are in communication connection with the upper computer, and an acquisition unit and an execution unit which are in communication connection with the PLC; the execution unit controls the slurry feeding unit, the slurry distribution unit, the grouting unit and the slurry returning unit to cooperatively distribute slurry. The slurry preparation and grouting can be automatically realized in the whole process, the parameters of the whole process of the slurry preparation and grouting can be monitored and collected, the density and the pressure of grouting slurry are matched with a preset scheme, and the execution precision is high; meanwhile, the recycling of qualified slurry can be realized to the greatest extent, and the slurry investment cost is greatly reduced.

Description

Accurate grout control system that joins in marriage

Technical Field

The invention relates to the field of water conservancy and hydropower foundation treatment instrument systems, in particular to the field of infrastructure grouting and slurry conveying systems, and particularly relates to a precise distribution grouting control system.

Background

In the foundation treatment construction type of modern water conservancy and hydropower, foundation grouting engineering occupies a large proportion. The grouting engineering construction process can be roughly divided into two processes of drilling and grouting. Specifically, the grouting construction comprises the following main process steps: preparation of slurry, slurry storage, slurry transportation, secondary slurry preparation, slurry injection into the stratum and quality control in the processes.

The basic treatment and grouting are preceded by a necessary slurry preparation procedure, i.e. the required slurry density is prepared by the way of adding fresh water into the primary slurry. The traditional slurry preparation equipment is used for manual filling and mechanical stirring, and has low slurry preparation efficiency and high labor intensity.

The slurry distribution station of the foundation treatment grouting project construction site is often far away from the slurry feeding station and the slurry preparing station by a certain distance. The primary pulp is conveyed to the pulp distribution station in a long distance through the pipeline without special equipment for monitoring, because a little mixture of the pulp and washing water is left in the pipeline after the pulp is sent or the pipeline is washed each time, the remaining mixture in the pipeline is sent out together when the pulp is sent for the second time and enters the pulp distribution station, and therefore pollution or instability of data on the original pulp is caused, and the accurate pulp distribution target proposed at present is not met.

Traditional joining in marriage thick liquid station has double-deck agitator structure or single agitator structure, but most designs are with agitator motor and speed reducer direct mount at the agitator top, and the structure is a whole with the agitator, and this kind of structure can arouse some vibrations of agitator when the motor during operation to lead to the fact the influence to the sensor on the agitator, increased the error.

The idea of a slurry preparation system has been proposed in the market at present, but the system for preparing cement slurry used in basic treatment construction does not have a device which can monitor the original slurry, monitor the slurry returned from underground after grouting, and integrate the functions into a whole? At present, no specific implementation method or existing equipment exists.

In summary, under the condition of analyzing the defects of the existing equipment, research is carried out on an integrated slurry mixing system with a monitoring function and an implementation method thereof, and the purpose is to solve the problems, realize slurry mixing automation, perfect the monitoring function, ensure slurry mixing quality and promote the automation degree of basic processing construction equipment.

Disclosure of Invention

In order to solve the technical problems that the traditional manual slurry preparation method adopted in the prior art is poor in precision and low in efficiency, and meanwhile, the density unevenness caused by slurry settlement can be caused in a long-time grouting process, the application provides a precise slurry preparation control system which can completely replace manual operation to prepare slurry and is higher in efficiency; carry out dual dosage to each way thick liquid and clear water through weighing sensor and flowmeter, ensure the precision of sending thick liquid of joining in marriage thick liquid for final grout quality can be implemented according to predetermineeing the construction plan. Moreover, the system is creatively provided with a slurry returning unit and a stirring unit different from the prior art, so that the utilization rate and the accuracy of the slurry in the whole process are substantially breakthrough and remarkably improved compared with the prior art.

In order to achieve the purpose, the technical scheme adopted by the application is as follows:

before explaining the working principle of the present system, the applicant first briefly describes the use context of the present system and the functions and complete flow of the upstream and downstream systems. Foundation grouting engineering is very common in water conservancy and hydropower foundation treatment, and its main process links include in proper order: preparation of grout → storage of grout → transportation of grout → secondary preparation of grout → grouting into the formation. Wherein the content of the first and second substances,

preparation of slurry: the preparation of the slurry is finished by a pulping station or a pulping system, and the high-concentration slurry is prepared by mixing the solidified powder of cement and the like with a specific label with water in a specific ratio, and is commonly called as primary slurry.

Storage and transport of the slurry: in the prior art, slurry is conveyed by a slurry conveying pipeline through coordination and manual operation by workers of upstream and downstream nodes needing to convey slurry; the technical scheme provided by the embodiment is the process for replacing the existing manual slurry conveying process.

Secondary slurry preparation and slurry filling: the slurry preparation and grouting are generally completed by equipment of a slurry preparation station and a grouting station, in the prior art, the mainstream adopts manual operation for grouting, and the control of grouting pressure and flow still depends on the experience and judgment of operators; the slurry preparation is mainly characterized in that the secondary slurry preparation density is controlled by controlling the mixing ratio of the primary slurry and the water by means of equipment.

After explaining the basic grouting engineering process flow, how to realize accurate and automatic slurry preparation/delivery by the automatic slurry preparation system provided by the application will be further described in detail below.

The slurry preparation system aims at replacing the manual operation process of 'secondary slurry preparation and slurry filling' so as to achieve the purposes of reducing personnel and improving efficiency, collecting parameters and controlling precision. Specifically, the method comprises the following steps:

a precise grouting allocation control system is used for carrying out secondary allocation on primary slurry according to the actual grouting slurry density requirement and accurately injecting the allocated slurry into a stratum according to the grouting construction requirement at the flow and pressure preset by the system, and comprises an upper computer, a display and a PLC (programmable logic controller) which are in communication connection with the upper computer, and an acquisition unit and an execution unit which are in communication connection with the PLC; the execution unit controls the slurry feeding unit, the slurry distribution unit, the grouting unit and the slurry returning unit to cooperatively distribute slurry; the density information, the flow information and the like related in the whole system are fed back to the PLC through the acquisition unit and further sent to the upper computer for processing and displaying, and meanwhile, after parameter comparison preset by the system, a logic operation output result is output and an execution instruction is sent to the execution unit for execution according to the system preset. It should be noted that the parameters preset by the above-mentioned system are specifically determined after determining the density of grouting slurry after exploration by units such as geological exploration research institute and the like aiming at the geological actual conditions of different construction sites in the whole grouting preparation process; the specific parameters are manually customized and reference to specific parameters is not intended to be a claim and a disclosure of the control system described herein, and the above explanation is merely provided for a better understanding of the control system described herein.

The acquisition unit comprises a raw stock densimeter, a grouting flowmeter and a slurry return flowmeter; the device is respectively used for acquiring and obtaining the density value of the primary pulp entering the system so as to judge whether the primary pulp entering the system meets the secondary pulp mixing use condition or not and facilitate the subsequent execution of pulp receiving or pulp discarding operation; the grouting flowmeter is used for counting the volume of accumulated grout, generally measured by taking the volume of the accumulated grout to be grouted as a unit, the grout return flowmeter is used for counting the accumulated volume of the returned grout, and the amount of the grout actually grouted into the stratum is obtained by calculating the difference between the volume of the grouting grout and the volume of the grout return.

The execution unit comprises a second raw pulp three-way valve, a raw pulp barrel pulp discharging valve, a pulp mixing barrel pulp discharging valve, a pulp returning and distributing three-way valve, a pulp discharging valve and a clear water control valve;

the pulp inlet unit comprises a raw pulp inlet communicated with the pulping station, a raw pulp densimeter and a second raw pulp three-way valve which are sequentially communicated, and the PLC controls the second raw pulp three-way valve to respectively guide raw pulp into the raw pulp barrel or into the pulp discharge pipe according to whether the density value detected and sent by the raw pulp densimeter belongs to the preset qualified raw pulp density value range;

join in marriage thick liquid unit including joining in marriage thick liquid bucket, advance thick liquid mechanism and mechanism of intaking, advance thick liquid mechanism including set up in former thick liquid barrel head portion through the thick liquid mouth of blowing that thick liquid bucket put thick liquid valve intercommunication, intake mechanism includes the moisturizing pipe that communicates with the water source to and set up the clear water control valve that is used for controlling clear water supply volume on the moisturizing pipe. The grouting unit comprises a grouting barrel and a slurry distribution barrel slurry discharge valve which is arranged at the bottom of the slurry distribution barrel and used for communicating the slurry distribution barrel with the grouting barrel; the bottom of the grouting barrel is provided with a grouting pipe, and a grout discharging valve, a grouting flow meter and a grouting pump are sequentially arranged on the grouting pipe along the grout conveying direction; when the raw stock from the pulping station enters the stock inlet unit through the stock inlet, the raw stock density value is detected through the raw stock densimeter, and the PLC reads the raw stock density value detected by the raw stock densimeter in real time and compares the raw stock density value with a preset raw stock density value range. If the obtained raw pulp density value is detected to be within the preset raw pulp density value range, the system judges that the raw pulp at the moment meets the pulp inlet condition, and the second raw pulp three-way valve guides the raw pulp into the raw pulp barrel; if the obtained raw pulp density value is lower than or higher than the preset raw pulp density value range, the system judges that the raw pulp at the moment does not accord with the pulp inlet condition, the second raw pulp three-way valve guides the raw pulp into the pulp discharge pipe, and the raw pulp inlet at the moment is not allowed. The pulp inlet unit has the beneficial technical effects that the pulp is distinguished and screened, only the pulp meeting the preset condition of the system is allowed to enter the primary pulp barrel, otherwise, the pulp is uniformly discarded, and the subsequent uncontrollable or unqualified pulp preparation quality caused by the unqualified primary pulp entering the system is avoided; therefore, the reliability of the grout is controlled from the source, and a solid foundation is laid for subsequent accurate grout preparation and grouting. Because the density of the slurry used in actual grouting is greatly lower than that of the primary slurry, after the primary slurry density is accurately controlled, the slurry with the specified density can be obtained by calculation according to the slurry-water mixing proportion, and the preset slurry density can be obtained by fully stirring. The feeding of the raw stock and the clear water is controlled by instructions sent to the stock inlet mechanism and the water inlet mechanism by the PLC logic controller respectively so as to realize the mixing of the raw stock and the clear water according to a preset proportion, and then the slurry after secondary slurry preparation, namely the grouting slurry, is obtained by fully stirring the raw stock and the clear water by the stirring unit.

The grout after the configuration of the grout distribution unit enters the grouting barrel through the grout discharge valve of the grout distribution barrel, when grouting is needed, the grout discharge valve is opened and passes through the grouting flow meter, and finally the grout is grouted into the stratum through the grouting pump through the grouting pipe.

The slurry return unit comprises a slurry return pipe for collecting slurry returned from the stratum, a pressure controller and a slurry return flowmeter which are sequentially arranged on the slurry return pipe along the slurry return flow direction, and a slurry return distribution three-way valve for respectively communicating the grouting barrel and the slurry abandoning pipe. The slurry returning unit is a mechanism for collecting and redistributing the returned slurry from the stratum, and the working principle is as follows: the slurry returning pipe is communicated with the stratum slurry returning port, so that stratum slurry returning enters the slurry returning unit through the slurry returning pipe, and the slurry returning unit is provided with the pressure controller, so that the slurry returning cannot pass through when the pressure of the slurry returning slurry is less than or equal to that of the pressure controller; on the contrary, when the pressure of the slurry returning is larger than that of the pressure controller, the slurry returning passes through the pressure controller and counts the slurry returning flow through the slurry returning flow meter, and finally the slurry returning distribution three-way valve leads the slurry returning into the slurry discarding pipe for slurry discarding or returns to the grouting barrel again for recovery; the pulp discarding and recovery corresponding pulp returning distribution three-way valves are controlled by preset logics of a PLC logic controller, generally, through exploration geological conditions of earlier projects, the preset front-stage pulp returning flow value is unqualified pulp, and when the actual pulp returning flow value is larger than the preset pulp discarding flow value, the default subsequent pulp returning is qualified pulp returning and no other impurities or moisture are doped; at the moment, the PLC sends a reversing instruction to the slurry return distribution three-way valve, so that the slurry return distribution three-way valve guides the slurry return into the grouting barrel for recycling. The setting of the slurry returning unit is also considered, the control of the pressure of the grouting stratum and the recycling of the slurry returning are also considered, so that the slurry investment cost is reduced, the quality screening of the slurry returning is also considered, and the quality of the grouting slurry is ensured.

The stirring units are respectively and independently arranged or integrally arranged in the original slurry barrel and the slurry preparation barrel in a penetrating way to stir the primary slurry and/or prepare the slurry. The stirring unit is used for keeping the uniformity of the density of the slurry in the original slurry barrel and the slurry mixing barrel, is also a commonly used slurry homogenizing means in the existing slurry mixing process, and is not detailed.

As a preferred technical solution of the present application, specifically, the slurry preparation system further includes a circulation detection unit, the circulation detection unit is composed of a circulation pump and a grouting densimeter which are mutually communicated through a circulation pipeline, an inlet of the circulation pump is communicated with an inlet of the slurry discharge valve through a pipeline, and an outlet of the grouting densimeter is communicated with the grouting barrel through a pipeline; and the grouting density meter is in communication connection with the PLC. The circulating detection unit has the following two functions that firstly, the circulating pump is used for circularly flowing the slurry in the grouting barrel to realize the vibration-free homogenate; and secondly, as the pipeline inlet of the circulation detection unit is communicated with the slurry discharge valve, namely slurry is taken out of the slurry discharge valve, the density detection of the grouting densimeter can obtain the density value information of the grouting slurry corresponding to any time period, and accurate and reliable data reference is provided for the evaluation of the subsequent whole grouting project. It is worth to say that the grouting densimeter must be arranged on a grouting pipeline of the slurry discharge valve, and as the flowing direction of the slurry is irreversible, the detected data accords with the objective fact of actual grouting slurry density, and compared with the existing value taking in a barrel, the grouting densimeter is more accurate and reliable; and for subsequent grouting project evaluation, reliable data basis is provided for whole grouting data playback, analysis and project effect evaluation prejudgment.

Preferably, advance the thick liquid unit still including setting up be in advance the thick liquid mouth and the magma densimeter between the first magma three-way valve, first magma three-way valve alternative switches on the magma densimeter or is used for communicateing another bypass branch pipe who advances the thick liquid unit. When the pulp mixing system has a pulp mixing task, the first raw pulp three-way valve is communicated with the raw pulp inlet and the raw pulp densimeter, namely, the raw pulp is guided into the pulp inlet unit to be mixed; when the pulp mixing system does not have a pulp mixing task, the first raw pulp three-way valve leads the raw pulp into the bypass branch pipe, the bypass branch pipe is seemingly simple in structure, but has prominent substantive characteristics after being combined with the pulp mixing system; specifically, when the slurry mixing system does not have a slurry mixing task, the bypass branch pipe is connected with another slurry mixing system, and similarly, the connection of a plurality of slurry mixing systems can be realized without limit theoretically according to the construction condition of an actual project; the improvement does not change the pulp mixing task and flow of the pulp mixing system, but has great beneficial effect on the synergy between the pulping station and the pulp mixing station in pulping, pulp feeding and pulp mixing. In the prior art, pipelines between a pulping station/a pulp conveying station and a pulp distribution station are usually communicated in a one-to-one butt joint mode or communicated in a unified conveying branch mode, no matter which mode is adopted, more pipelines are generated between the pulping station and the pulp distribution station, and the direct cost of pipeline installation and investment is increased; and the more elbows and branches in the main pipeline, the easier the pipeline blockage is caused, and the hidden danger of system stability or the flushing cost is increased. By adopting the structure, the combined work of the multiple pulp distribution systems can be realized only by one pipeline between the pulp making station and the pulp distribution station, and the conveying cost in the whole pulp making, pulp conveying and pulp distribution process can be greatly saved.

Preferably, the slurry preparation unit further comprises a raw slurry barrel weighing sensor arranged at the bottom of the raw slurry barrel and used for detecting the real-time weight of the raw slurry barrel and sending information to the PLC logic controller, and a slurry preparation barrel weighing sensor arranged at the bottom of the slurry preparation barrel and used for detecting the real-time weight of the slurry preparation barrel and sending information to the PLC logic controller. The function and the working principle of the original slurry barrel weighing sensor are the same as those of the slurry mixing barrel weighing sensor, but the two weighing sensors are different in target, namely the original slurry in the original slurry barrel and the slurry mixing slurry in the slurry mixing barrel after secondary slurry mixing. Taking a raw pulp barrel weighing sensor as an example, the two functions are realized, one function is that the actually detected weight is sent to a PLC logic controller in real time to be compared with the no-load weight and the full-load weight preset by the system, so as to give an alarm of the empty pulp or the overflow in time; secondly, accurate counterweight is carried out, and because secondary pulp preparation requires accurate mass ratio between the raw pulp and clear water, the weight of the raw pulp entering the pulp preparation barrel can be obtained through the mass of the raw pulp reduced by the weighing sensor of the raw pulp barrel; similarly, when the raw pulp barrel is in a pulp feeding state, the increased numerical value of the weighing sensor of the pulp mixing barrel can be acquired to read the increased amount of the raw pulp or the clear water, so that the technical effect of accurately mixing the pulp is achieved.

Preferably, a slurry return densimeter for detecting the density of slurry returned and sending the detected density value of the slurry returned to the PLC in real time is further arranged between the slurry return pipe and the pressure controller, and the slurry return distribution three-way valve sends a control instruction to the slurry return distribution three-way valve according to whether the detected density value of the slurry returned by the PLC belongs to the range of the grouting density value or not;

when the density value detected by the slurry return belongs to the preset range of the grouting density value, the slurry return distribution three-way valve guides the slurry return into the grouting barrel; and when the detected density value of the returned slurry does not belong to the preset range of the grouting density value, the slurry returning distribution three-way valve guides the slurry returning to the slurry discarding pipe.

Preferably, the stirring unit comprises a driving device and a stirring device which are vertically installed above the original slurry barrel and fixed on a main body frame of the slurry preparation system, the stirring device comprises a first stirrer which is in driving connection with the driving device and is arranged in the original slurry barrel and a second stirrer which penetrates through the bottom of the original slurry barrel and extends into the slurry preparation barrel to coaxially rotate with the first stirrer, and a sliding sealing mechanism is arranged between the second stirrer and the bottom of the original slurry barrel.

Preferably, the automatic slurry distribution system further comprises an air compressor, wherein the first raw slurry three-way valve, the second raw slurry three-way valve, the raw slurry barrel slurry discharging valve, the slurry distribution barrel slurry discharging valve, the pressure controller, the slurry return distribution three-way valve, the clear water control valve and the slurry discharging valve are all pneumatic valves and are connected with the air compressor, and opening and closing actions are executed according to on-off instructions sent by the PLC.

Preferably, the bottom of the grouting barrel is also provided with a grouting barrel weighing sensor for monitoring the weight of the grouting barrel in real time.

In order to improve the accuracy of data, preferably, the raw slurry bucket weighing sensor, the slurry distribution bucket weighing sensor and the grouting bucket weighing sensor are all three and are respectively installed at the bottom of the raw slurry bucket, the slurry distribution bucket and the grouting bucket at equal intervals.

Advantageous effects

The system innovatively provides the method for monitoring the slurry density of the original slurry by using the density sensor, and the defect that the quality of the original slurry is not monitored by the conventional device is overcome. Meanwhile, when a circulating grouting method is adopted, the density of the slurry is changed in the circulating process, so that the density of the slurry exceeds the allowable change range; the system innovatively provides a method for monitoring the density of the grout in the grouting barrel in real time by using the density sensor, and simultaneously, the density of the returned grout is judged, so that the unqualified returned grout is prevented from entering the grouting barrel again, the qualified returned grout is prevented from being wasted by the abandoned grout, the utilization rate of grouting resources is high, and the cost benefit is good.

The stirring unit of the system innovatively provides that the speed reducer and the motor are independently fixed on the frame, and is different from the traditional speed reducer and motor which are directly fixed on the pulp barrel, so that the influence of the vibration of the motor during working on a sensor on the corresponding pulp barrel is avoided.

The system also provides a grouting flowmeter and a slurry return flowmeter, the total amount of the slurry poured into the stratum and the real-time pouring rate (the parameter of the slurry poured into the stratum is the parameter of the grouting flowmeter-the parameter of the slurry return flowmeter) can be accurately known through the calculation of a PLC program in the PLC logic controller, and real technical data are provided for the later analysis of grouting.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise.

FIG. 1 is a block diagram of the control architecture of the present application;

FIG. 2 is a perspective view of the present application (hiding part of the body frame);

FIG. 3 is another visual orientation isometric view of FIG. 1;

FIG. 4 is a perspective view of the main body frame removed;

FIG. 5 is another visual orientation isometric view of FIG. 3;

fig. 6 is another perspective view of the visual orientation of fig. 3.

In the figure: 0-air compressor; 1-a raw pulp inlet; 2-a first virgin stock three-way valve; 3-measuring the density of the primary pulp; 4-a second virgin stock three-way valve; 5-slurry discarding pipe; 6-a drive device; 7-a stirring device; 8-raw pulp barrel; 9-a pulp discharging valve of the primary pulp barrel; 10-a raw pulp barrel weighing sensor; 11-a pulp mixing barrel; 12-a weighing sensor of a pulp mixing barrel; 13-slurry discharging valve of slurry preparation barrel; 14-grouting barrel; 15-grouting bucket weighing sensor; 16-a slurry return pipe; 17-returning the pulp densimeter; 18-a pressure controller; 19-a slurry return flowmeter; 20-slurry return distribution three-way valve; 21-grouting densitometer; 22-a circulation pump; 23-a slurry discharge valve; 24-grouting flow meter; 25-grouting pipes; 26-water replenishing pipe; 27-a clear water control valve; 28-grouting pump.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Example 1:

the precise grouting allocation control system shown in fig. 1-6 is used for performing secondary allocation on primary slurry according to the actual grouting slurry density requirement, and precisely injecting the allocated slurry into a stratum at a flow rate and a pressure preset by the system according to the grouting construction requirement, and comprises an upper computer, a display and a PLC logic controller which are in communication connection with the upper computer, and an acquisition unit and an execution unit which are in communication connection with the PLC logic controller; the execution unit controls the slurry feeding unit, the slurry distribution unit, the grouting unit and the slurry returning unit to cooperatively distribute slurry;

the acquisition unit comprises a raw stock densimeter 3, a grouting flowmeter 24 and a slurry return flowmeter 19;

the execution unit comprises a second raw pulp three-way valve 4, a raw pulp barrel pulp discharging valve 9, a pulp distribution barrel pulp discharging valve 13, a pulp return distribution three-way valve 20, a pulp discharging valve 23 and a clear water control valve 27;

the pulp inlet unit comprises a raw pulp inlet 1 communicated with the pulping station, a raw pulp densimeter 3 and a second raw pulp three-way valve 4 which are sequentially communicated, and the PLC controls the second raw pulp three-way valve 4 to respectively guide raw pulp into a raw pulp barrel 8 or a pulp discharge pipe 5 according to whether the density value detected and sent by the raw pulp densimeter 3 belongs to a preset qualified raw pulp density value range; the slurry preparation unit comprises a slurry preparation barrel 11, a slurry inlet mechanism and a water inlet mechanism, wherein the slurry inlet mechanism comprises a slurry discharge port which is arranged at the bottom of a raw slurry barrel 8 and is communicated with the bottom of the raw slurry barrel through a slurry discharge valve 9, the water inlet mechanism comprises a water replenishing pipe 26 communicated with a water source, and a clean water control valve 27 which is arranged on the water replenishing pipe 26 and is used for controlling the supply amount of clean water; the grouting unit comprises a grouting barrel 14 and a slurry distribution barrel slurry discharging valve 13 which is arranged at the bottom of the slurry distribution barrel 11 and is used for communicating the slurry distribution barrel 11 with the grouting barrel 14; a grouting pipe 25 is arranged at the bottom of the grouting barrel 14, and a grout discharge valve 23, a grouting flow meter 24 and a grouting pump 28 are sequentially arranged on the grouting pipe 25 along the grout conveying direction; the slurry return unit comprises a slurry return pipe 16 for collecting slurry returned from the stratum, a slurry return pressure gauge, a pressure controller 18 and a slurry return flow meter 19 which are sequentially arranged on the slurry return pipe 16 along the slurry return flow direction, and a slurry return distribution three-way valve 20 for respectively communicating the grouting barrel 14 and the slurry abandoning pipe 5; and the stirring unit comprises stirring devices 7 which are respectively and independently arranged or integrally arranged in the original slurry barrel 8 and the slurry preparation barrel 11 in a penetrating way and are used for stirring the primary slurry and/or preparing the slurry. The density information, the flow information and the like related in the whole system are fed back to the PLC through the acquisition unit and further sent to the upper computer for processing and displaying, and meanwhile, after parameter comparison preset by the system, a logic operation output result is output and an execution instruction is sent to the execution unit for execution according to the system preset. It should be noted that the parameters preset by the above-mentioned system are specifically determined after determining the density of grouting slurry after exploration by units such as geological exploration research institute and the like aiming at the geological actual conditions of different construction sites in the whole grouting preparation process; the specific parameters are manually customized and reference to specific parameters is not intended to be a claim and a disclosure of the control system described herein, and the above explanation is merely provided for a better understanding of the control system described herein.

The primary pulp density meter 3 is used for acquiring and obtaining the density value of the primary pulp entering the system so as to judge whether the primary pulp entering the system meets the secondary pulp mixing use condition or not and facilitate the subsequent execution of receiving or discarding pulp; the grouting flow meter 24 is used for counting the volume of the accumulated grouting slurry, generally measured in units of liters, and the slurry return flow meter 19 is used for counting the accumulated volume of the returned slurry, and calculating the difference between the volume of the grouting slurry and the volume of the slurry return to obtain the amount of the slurry actually poured into the stratum.

When the raw stock from the pulping station enters the stock inlet unit through the raw stock inlet 1, the raw stock density value is detected through the raw stock densimeter 3, and the PLC reads the raw stock density value detected by the raw stock densimeter 3 in real time and compares the raw stock density value with a preset raw stock density value range. If the obtained raw pulp density value is detected to be within the preset raw pulp density value range, the system judges that the raw pulp at the moment meets the pulp inlet condition, and the second raw pulp three-way valve 4 guides the raw pulp into the raw pulp barrel 8; if the obtained raw pulp density value is lower than or higher than the preset raw pulp density value range, the system judges that the raw pulp at the moment does not accord with the pulp inlet condition, the second raw pulp three-way valve 4 leads the raw pulp into the pulp discharge pipe 5, and the raw pulp inlet at the moment is not allowed. The pulp inlet unit has the beneficial technical effects that the pulp is distinguished and screened, only the pulp meeting the preset condition of the system is allowed to enter the primary pulp barrel 8, otherwise, the pulp is uniformly discarded, and the subsequent uncontrollable or unqualified pulp preparation quality caused by the unqualified primary pulp entering the system is avoided; therefore, the reliability of the grout is controlled from the source, and a solid foundation is laid for subsequent accurate grout preparation and grouting. Because the density of the slurry used in actual grouting is lower than that of the primary slurry, after the primary slurry density is accurately controlled, the slurry with the specified density can be obtained by calculation according to the slurry-water mixing proportion, and the preset slurry density can be obtained by fully stirring. The feeding of the raw stock and the clear water is controlled by instructions sent to the stock inlet mechanism and the water inlet mechanism by the PLC logic controller respectively so as to realize the mixing of the raw stock and the clear water according to a preset proportion, and then the slurry after secondary slurry preparation, namely the grouting slurry, is obtained by fully stirring the raw stock and the clear water by the stirring unit.

The slurry after the configuration of the slurry preparation unit enters the grouting barrel 14 through a slurry discharge valve of the slurry preparation barrel 11, when grouting is needed, a slurry discharge valve is opened and passes through a grouting flow meter, and finally the slurry is grouted into the stratum through a grouting pump 28 through a grouting pipe.

The slurry returning unit is a mechanism for collecting and redistributing the returned slurry from the stratum, and the working principle is as follows: the slurry returning pipe 16 is communicated with the stratum slurry returning port, so that stratum slurry returning enters the slurry returning unit through the slurry returning pipe, and the slurry returning unit is provided with the pressure controller 18, so that the slurry returning cannot pass through when the pressure of the slurry returning is less than or equal to that of the pressure controller 18; on the contrary, when the pressure of the slurry returning is greater than that of the pressure controller 18, the slurry returning passes through the pressure controller 18 and counts the slurry returning flow through the slurry returning flow meter 19, and finally the slurry returning distribution three-way valve 20 guides the slurry returning to the slurry abandoning pipe 5 for slurry abandoning or returns to the grouting barrel 14 again for recovery; the pulp-returning distribution three-way valve 20 corresponding to pulp-discarding and recovery is controlled by the preset logic of the PLC logic controller, generally, through the geological condition of the early-stage project exploration, the preset front-stage pulp-returning flow value is unqualified pulp, and when the actual pulp-returning flow value is larger than the preset pulp-discarding flow value, the default subsequent pulp-returning is qualified pulp-returning and no other impurities or moisture are doped; at this time, the PLC logic controller will send a reversing instruction to the slurry return distribution three-way valve 20, so that the slurry return distribution three-way valve 20 guides the slurry return into the grouting barrel 14 for reuse. The setting of the slurry returning unit is also considered, the control of the pressure of the grouting stratum and the recycling of the slurry returning are also considered, so that the slurry investment cost is reduced, the quality screening of the slurry returning is also considered, and the quality of the grouting slurry is ensured.

The stirring unit is used for keeping the uniformity of the density of the slurry in the original slurry barrel 8 and the slurry mixing barrel 11, and is also a commonly used slurry homogenizing means in the existing slurry mixing process, and details are not described.

Example 2:

as a preferred embodiment of the present application, on the basis of the mechanism and principle of embodiment 1, further with reference to the structure shown in fig. 4, the slurry preparation system further includes a circulation detection unit, the circulation detection unit is composed of a circulation pump 22 and a grouting densimeter 21 which are mutually communicated through a circulation pipeline, an inlet of the circulation pump 22 is communicated with an inlet of the slurry discharge valve 23 through a pipeline, and an outlet of the grouting densimeter 21 is communicated with the grouting barrel 14 through a pipeline; the grouting density meter 21 is in communication connection with the PLC. The circulating detection unit has the following two functions that firstly, the circulating pump 22 is utilized to circularly flow the slurry in the grouting barrel 14 to realize the vibration-free homogenate; secondly, because the pipeline inlet of the circulation detection unit is communicated with the grout discharging valve 23, namely, grout is taken out from the grout discharging valve 23, the density detection of the grouting density meter 21 can obtain the density value information of the grouting grout corresponding to any time period, and accurate and reliable data reference is provided for the evaluation of the subsequent whole grouting project. It is worth to be noted that the grouting density meter 21 must be arranged on the grouting pipeline of the grout outlet valve 23, and since the flowing direction of the grout is not reversible, the detected data conforms to the objective fact of the actual grouting grout density, and compared with the existing barrel value, the grouting density meter is more accurate and reliable; and for subsequent grouting project evaluation, reliable data basis is provided for whole grouting data playback, analysis and project effect evaluation prejudgment.

Example 3:

on the basis of embodiment 1 or embodiment 2, further optimize the structural design, as shown in fig. 2-4 with reference to the accompanying drawings, specifically, the pulp inlet unit further includes a first raw pulp three-way valve 2 disposed between the raw pulp inlet 1 and the raw pulp density meter 3, and the first raw pulp three-way valve 2 alternatively conducts the raw pulp density meter 3 or a bypass branch pipe for communicating with another pulp inlet unit.

The working principle and the beneficial effects are explained as follows:

when the pulp mixing system has a pulp mixing task, the first raw pulp three-way valve 2 conducts the raw pulp inlet 1 and the raw pulp densimeter 3, namely, the raw pulp is guided into the pulp inlet unit to be mixed; when the pulp mixing system does not have a pulp mixing task, the first raw pulp three-way valve 2 leads the raw pulp into a bypass branch pipe, the bypass branch pipe is seemingly simple in structure, but has prominent substantive characteristics after being combined with the pulp mixing system; specifically, when the slurry mixing system does not have a slurry mixing task, the bypass branch pipe is connected with another slurry mixing system, and similarly, the connection of a plurality of slurry mixing systems can be realized without limit theoretically according to the construction condition of an actual project; the improvement does not change the pulp mixing task and flow of the pulp mixing system, but has great beneficial effect on the synergy between the pulping station and the pulp mixing station in pulping, pulp feeding and pulp mixing. In the prior art, pipelines between a pulping station/a pulp conveying station and a pulp distribution station are usually communicated in a one-to-one butt joint mode or communicated in a unified conveying branch mode, no matter which mode is adopted, more pipelines are generated between the pulping station and the pulp distribution station, and the direct cost of pipeline installation and investment is increased; and the more elbows and branches in the main pipeline, the easier the pipeline blockage is caused, and the hidden danger of system stability or the flushing cost is increased. By adopting the structure, the combined work of the multiple pulp distribution systems can be realized only by one pipeline between the pulp making station and the pulp distribution station, and the conveying cost in the whole pulp making, pulp conveying and pulp distribution process can be greatly saved.

In this example, as the optimization scheme of the slurry preparation precision, the slurry preparation unit further includes a raw slurry barrel weighing sensor 10 disposed at the bottom of the raw slurry barrel 8 and used for detecting the real-time weight of the raw slurry barrel 8 and sending information to the PLC logic controller, and a slurry preparation barrel weighing sensor 12 disposed at the bottom of the slurry preparation barrel 11 and used for detecting the real-time weight of the slurry preparation barrel 11 and sending information to the PLC logic controller. The action and the working principle of the raw pulp bucket weighing sensor 10 are the same as those of the pulp distribution bucket weighing sensor 12, but the two are different in target, namely raw pulp slurry in the raw pulp bucket 8 and pulp distribution slurry in the pulp distribution bucket 11 after secondary pulp distribution. Taking a raw pulp barrel weighing sensor 10 as an example, the two functions are realized, one function is that the actually detected weight is sent to a PLC logic controller in real time to be compared with the no-load weight and the full-load weight preset by the system, so as to give an alarm of the empty pulp or the overflow in time; secondly, accurate counterweight is carried out, and because secondary pulp preparation requires accurate mass ratio between the raw pulp and clear water, the weight of the raw pulp entering the pulp preparation barrel 11 can be obtained through the mass of the raw pulp reduced by the raw pulp barrel weighing sensor 10; similarly, when the original pulp barrel 8 is in a pulp feeding state, the increased value of the weighing sensor 12 of the pulp mixing barrel can be acquired to read the increased amount of the raw pulp or the clear water, so that the technical effect of accurately mixing the pulp is achieved.

Because the magma density that enters into in the magma bucket 8 gathers through the accurate collection of magma densimeter 3, according to the preset proportion of system, for example the ratio V thick liquid of magma volume and clear water volume as required: when V water is 5:2, M pulp/ρ pulp is: m water/rho water is 5:2, wherein rho pulp and rho water are known, the entering amount of raw pulp and water can be sequentially obtained through a weighing sensor 12 of a pulp mixing barrel, and water inlet or pulp inlet is stopped until the pulp-water ratio reaches the preset condition of the system; it should be noted that, because the information is obtained by weighing, the water inlet time interval of the primary pulp and the clear water must be divided, only water or pulp can be independently selected and can not enter the pulp mixing barrel 11 at the same time, otherwise, accurate pulp-water mixing ratio cannot be obtained.

Example 4:

the structure principle and the attached drawings of the embodiment 3 are further optimized, a slurry return densimeter 17 for detecting the density of slurry returning and sending the detected density value of the slurry returning to the PLC in real time is further arranged between the slurry returning pipe 16 and the pressure controller 18, and the slurry return distribution three-way valve 20 sends a control instruction to the slurry return distribution three-way valve 20 according to the comparison of the density value of the slurry returning and detected by the PLC whether the density value belongs to the range of the grouting density value;

when the density value detected by the slurry return belongs to the preset range of the grouting density value, the slurry return distribution three-way valve 20 guides the slurry return into the grouting barrel 14; and when the density value detected by the slurry return does not belong to the preset range of the grouting density value, the slurry return distribution three-way valve 20 guides the slurry return into the slurry discharge pipe 5. The stirring unit comprises a driving device 6 and a stirring device 7 which are vertically arranged above the original slurry barrel 8 and fixed on a main body frame of the slurry preparation system, the stirring device 7 comprises a first stirrer which is in driving connection with the driving device 6 and is arranged in the original slurry barrel 8 and a second stirrer which penetrates through the bottom of the original slurry barrel 8 and extends into the slurry preparation barrel 11 to coaxially rotate with the first stirrer, and a sliding sealing mechanism is arranged between the second stirrer and the bottom of the original slurry barrel 8. The stirring unit in this embodiment sets up on main body frame, with former thick liquid bucket 8 and join in marriage thick liquid bucket 11 all not physical contact, under drive arrangement 6's drive effect, can not directly transmit the vibration to the magma bucket 8 with join in marriage on the thick liquid bucket 11, this will fundamentally avoid leading to weighing sensor's data distortion problem because of the vibration that drive arrangement 6 work produced. The driving device 6 can be realized by adopting the existing speed reducer and motor combination.

In this embodiment, still include air compressor machine 0, first magma three-way valve 2, second magma three-way valve 4, magma bucket grout outlet valve 9, join in marriage the magma bucket grout outlet valve 13, pressure controller 18, return thick liquid distribution three-way valve 20, clear water control valve 27 and arrange thick liquid valve 23 and all adopt pneumatic valve and be connected with air compressor machine 0, according to the on-off instruction that PLC logical control sent carries out the switching action.

In this embodiment, a grouting barrel weighing sensor 15 for monitoring the weight of the grouting barrel 14 in real time is further arranged at the bottom of the grouting barrel 14.

In order to improve the accuracy of data, preferably, the raw pulp bucket weighing sensor 10, the pulp distribution bucket weighing sensor 12 and the grouting bucket weighing sensor 15 are all three and are respectively installed at the bottom of the raw pulp bucket 8, the bottom of the pulp distribution bucket 11 and the bottom of the grouting bucket 14 at equal intervals.

Example 5:

in this embodiment, the whole grout distribution and injection flow of the present application is explained with reference to fig. 1 to 6, and the structural part involved in grout distribution and injection in this embodiment is defaulted to be directly communicated with the outlet of the upstream grout making station for supplying the grout, so that the flow of delivering the grout to other subsequent grout distribution and injection systems by the first grout three-way valve 2 is not involved.

Firstly, when the host computer gathered empty bucket or magma surplus not enough through magma bucket weighing sensor 10, the magma entered the mouth 1 through the magma densimeter 3 through the magma, and magma densimeter 3 sends the magma density to PLC logic controller and carries out the contrast operation, and the different instruction of the qualified/unqualified of alternative output thick liquid.

If the density of the raw pulp slurry is qualified, an opening signal is sent to the first electromagnetic valve, the second electromagnetic valve is closed, and the first raw pulp three-way valve 2 is opened and led into the raw pulp barrel 8; if not, leading in a pulp discarding pipe 5 for pulp discarding until the density is qualified; the first raw stock three-way valve 2 feeds back the actual opening position to the PLC logic controller, and stops if the actual opening position meets the preset opening position; if the command is not matched, the command is reissued.

After the raw stock enters the raw stock bucket 8 and the liquid level meets the highest value of the preset condition, the liquid level control can be determined by the total mass through a weighing sensor of the raw stock bucket, and the direct collection of the liquid level sensor can be realized. When secondary pulp distribution is needed, the PLC logic controller respectively sends opening and closing instructions to the third electromagnetic valve and the fourth electromagnetic valve, opens the pulp discharging valve 9 of the pulp mixing barrel, so that the pulp flows into the pulp mixing barrel 11 under the action of gravity and self pressure until the pulp reaches a preset pulp value of the system and is closed, and the amount of the pulp entering the pulp mixing barrel 11 is weighed by the pulp mixing barrel weighing sensor 12; and then, the clear water control valve 27 is opened, and clear water is injected under the control of the thirteenth electromagnetic valve and the fourteenth electromagnetic valve until the proportion of the primary pulp to the clear water reaches the preset condition, and the details are described in the embodiment 3. After the slurry is uniformly stirred, the slurry discharge valve 13 of the slurry preparation barrel is opened and controlled by a seventh electromagnetic valve and an eighth electromagnetic valve, and the slurry after the secondary slurry preparation is placed into the grouting barrel 14 for standby.

When grouting is needed, the slurry discharge valve 23 is opened and controlled by the eleventh and twelfth electromagnetic valves, and a manual valve as shown in fig. 4 may be used, which reduces the automation degree of the whole grouting machine. And issues grouting instructions to the grouting pump 28 for grouting. It should be noted that, in the present application, the working principle of the two-way or three-way valve controlled by the first solenoid valve to the fourteenth solenoid valve shown in fig. 1 is the same, and the valve is a commercially available existing valve with position feedback. In the prior art, a plurality of types such as a rack pneumatic valve, a diaphragm pneumatic valve and a piston pneumatic valve are used for replacing the prior art, a gas source is provided by the air compressor 0, and the on-off of the gas is realized by controlling the first solenoid valve, the fourteenth solenoid valve by a PLC (programmable logic controller).

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (9)

1. The utility model provides an accurate grout control system that joins in marriage for carry out the secondary configuration with magma according to actual grout slurry density demand, and according to the grout construction requirement with the thick liquid after the configuration with the accurate stratum of pouring into of flow and pressure that the system presetted, its characterized in that:

the system comprises an upper computer, a display and a PLC (programmable logic controller) which are in communication connection with the upper computer, and an acquisition unit and an execution unit which are in communication connection with the PLC; the execution unit controls the slurry feeding unit, the slurry distribution unit, the grouting unit and the slurry returning unit to cooperatively distribute slurry;

the acquisition unit comprises a grouting flowmeter (24), a slurry return flowmeter (19) and a raw slurry densimeter (3);

the execution unit comprises a second raw pulp three-way valve (4), a raw pulp barrel pulp discharging valve (9), a pulp mixing barrel pulp discharging valve (13), a pulp returning and distributing three-way valve (20), a pulp discharging valve (23) and a clear water control valve (27);

the pulp inlet unit comprises a raw pulp inlet (1) communicated with the pulping station, a raw pulp densimeter (3) and a second raw pulp three-way valve (4) which are sequentially communicated, and the PLC controls the second raw pulp three-way valve (4) to respectively guide raw pulp into a raw pulp barrel (8) or into a pulp discharge pipe (5) according to whether a density value detected and sent by the raw pulp densimeter (3) belongs to a preset qualified raw pulp density value range; the slurry distribution unit comprises a slurry distribution barrel (11), a slurry inlet mechanism and a water inlet mechanism, wherein the slurry inlet mechanism comprises a slurry discharge port which is arranged at the bottom of a raw slurry barrel (8) and is communicated with the raw slurry barrel through a slurry discharge valve (9), the water inlet mechanism comprises a water replenishing pipe (26) communicated with a water source, and a clear water control valve (27) which is arranged on the water replenishing pipe (26) and is used for controlling clear water replenishing quantity; the grouting unit comprises a grouting barrel (14) and a slurry distribution barrel slurry discharging valve (13) arranged at the bottom of the slurry distribution barrel (11) and used for communicating the slurry distribution barrel (11) with the grouting barrel (14); a grouting pipe (25) is arranged at the bottom of the grouting barrel (14), and a grout discharge valve (23), a grouting flow meter (24) and a grouting pump (28) are sequentially arranged on the grouting pipe (25) along the grout conveying direction; the slurry return unit comprises a slurry return pipe (16) for collecting slurry returned from the stratum, a slurry return pressure gauge, a pressure controller (18), a slurry return flow meter (19) and a slurry return distribution three-way valve (20), wherein the slurry return pressure gauge, the pressure controller (18) and the slurry return flow meter (19) are sequentially arranged on the slurry return pipe (16) along the slurry return flow direction, and the slurry return distribution three-way valve (20) is respectively communicated with the grouting barrel (14) and the slurry abandoning pipe (5); and the stirring unit comprises stirring devices (7) which are respectively and independently arranged or integrally arranged in the original slurry barrel (8) and the slurry preparation barrel (11) in a penetrating way and are used for stirring the primary slurry and/or the prepared slurry.

2. The precise-matching grouting control system according to claim 1, characterized by further comprising a circulation detection unit, wherein the circulation detection unit is composed of a circulation pump (22) and a grouting densimeter (21) which are mutually communicated through a circulation pipeline, an inlet of the circulation pump (22) is communicated with an inlet of the grout discharging valve (23) through a pipeline, and an outlet of the grouting densimeter (21) is communicated with the grouting barrel (14) through a pipeline; the grouting density meter (21) is in communication connection with the PLC; advance thick liquid unit still including setting up first magma three-way valve (2) between magma advance thick liquid mouth (1) and magma densimeter (3), first magma three-way valve (2) a selection switches on magma densimeter (3) or is used for the intercommunication another bypass branch pipe that advances thick liquid unit.

3. The accurate distribution grouting control system according to claim 2, wherein the distribution unit further comprises a raw slurry barrel weighing sensor (10) arranged at the bottom of the raw slurry barrel (8) and used for detecting the real-time weight of the raw slurry barrel (8) and sending information to the PLC, and a distribution barrel weighing sensor (12) arranged at the bottom of the distribution barrel (11) and used for detecting the real-time weight of the distribution barrel (11) and sending information to the PLC.

4. The precise distribution grouting control system according to claim 3, characterized in that a slurry return densimeter (17) for detecting the density of slurry returned from the slurry return pipe (16) and sending the detected density value of the slurry returned to the PLC in real time is further arranged between the slurry return pipe and the pressure controller (18), and the slurry return distribution three-way valve (20) sends a control instruction to the slurry return distribution three-way valve (20) according to the comparison of the detected density value of the slurry returned by the PLC and whether the detected density value belongs to the grouting density value range; when the density value detected by the slurry return belongs to the preset range of the grouting density value, the slurry return distribution three-way valve (20) guides the slurry return into the grouting barrel (14); and when the detected density value of the returned slurry does not belong to the preset range of the grouting density value, the three-way valve (20) for distributing the returned slurry guides the returned slurry into the slurry discharge pipe (5).

5. The accurate grouting matching control system according to claim 4, wherein the stirring unit comprises a driving device (6) and a stirring device (7) which are vertically arranged above the original slurry barrel (8) and fixed on a main body frame of the grouting matching system, the stirring device (7) comprises a first stirrer which is in driving connection with the driving device (6) and is arranged in the original slurry barrel (8) and a second stirrer which penetrates through the bottom of the original slurry barrel (8), extends into the grouting matching barrel (11) and coaxially rotates with the first stirrer, and a sliding sealing mechanism is arranged between the second stirrer and the bottom of the original slurry barrel (8).

6. The precise-matching grouting control system according to claim 5, wherein: still include air compressor machine (0), first magma three-way valve (2), second magma three-way valve (4), magma bucket grout discharging valve (9), join in marriage magma bucket grout discharging valve (13), pressure controller (18), return thick liquid distribution three-way valve (20), clear water control valve (27) and arrange thick liquid valve (23) and all adopt pneumatic valve and be connected with air compressor machine (0), according to the on-off instruction that PLC logical control ware sent carries out the switching action.

7. The precise grout control system of claim 6, wherein: the bottom of the grouting barrel (14) is also provided with a grouting barrel weighing sensor (15) for monitoring the weight of the grouting barrel (14) in real time.

8. The precision-matched grouting control system according to claim 7, wherein: former thick liquid bucket weighing sensor (10), join in marriage thick liquid bucket weighing sensor (12) and grout bucket weighing sensor (15) are three, and all adopt equidistant install respectively in former thick liquid bucket (8), join in marriage thick liquid bucket (11) and grout bucket (14) bottom.

9. The precision-matched grouting control system according to claim 8, wherein: and the second primary pulp three-way valve (4), the primary pulp barrel pulp discharging valve (9), the pulp distribution barrel pulp discharging valve (13), the pulp return distribution three-way valve (20), the pulp discharge valve (23) and the clear water control valve (27) are respectively controlled to be opened/closed through two electromagnetic valves and feed back the opening/closing execution position state to the PLC.

Images