Grouting filling system and grouting filling method for conveying slurry upward with large height difference

Abstract

The embodiment of the present invention discloses a grouting filling system and a grouting filling method for conveying slurry upward over a large height difference. The system relates to the technical field of mine paste filling equipment and is invented to reduce the adverse effects of slurry conveying on equipment and piping systems. The system includes a filling pump, which includes a piston cylinder, a hydraulic push rod, and a piston connected to the hydraulic push rod, and the piston can reciprocate in the piston cylinder under the action of the hydraulic push rod; a check valve, the inlet end of the check valve is connected to the outlet end of the filling pump; a first conveying pipeline, which is a flexible conveying pipeline, one end of the first conveying pipeline is connected to the outlet end of the check valve, and the other end is connected to a buffer tank; the buffer tank is provided with a safety valve; and a second conveying pipeline, one end of the second conveying pipeline is connected to the buffer tank, and is used to convey the filling slurry upward. The embodiment of the present invention is suitable for scenarios where slurry is conveyed upward over a large height difference.

Description

Technical Field

[0001] The present invention relates to the technical field of mine paste filling equipment, and in particular to a grouting filling system and a grouting filling method for conveying slurry upward with a large height difference. Background Art

[0002] With the advancement of human technology, the stability and safety of fluid transport are becoming increasingly important in daily operations and engineering environments. With an increasing number of mines adopting the backfill mining method, the operating conditions faced by these projects are becoming more complex and diverse, especially with the increasing number of upward transport conditions involving large elevation differences (over 500 meters).

[0003] Under the working condition of upward transportation with a large height difference, at the moment the filling industrial pump changes direction, the delivery flow will have periodic pulses and the slurry will have different degrees of backflow. When the filling industrial pump stops, the residual slurry in the delivery pipeline will flow back downward, causing a water hammer effect, which will cause serious impact on the filling industrial pump and pipeline system, and pose a huge safety hazard. Summary of the Invention

[0004] In view of this, an object of the present invention is to provide a grouting filling system and a grouting filling method for transporting slurry upward over a large height difference, which can reduce the adverse effects of slurry transportation on equipment and piping systems.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] In a first aspect, an embodiment of the present invention provides a grouting filling system for conveying slurry upward with a large height difference, the grouting filling system comprising:

[0007] A filling pump, the filling pump includes a piston cylinder, a hydraulic push rod and a piston connected to the hydraulic push rod, and the piston can reciprocate in the piston cylinder under the action of the hydraulic push rod; a check valve, the inlet end of the check valve is connected to the outlet end of the filling pump; a first conveying pipe, the first conveying pipe is a flexible conveying pipe, one end of the first conveying pipe is connected to the outlet end of the check valve, and the other end is connected to the buffer tank; a safety valve is provided on the buffer tank; a second conveying pipe, one end of the second conveying pipe is connected to the buffer tank, and is used to convey the filling slurry upward.

[0008] Optionally, the first delivery pipeline is a steel braided hose arranged in a curved state.

[0009] Optionally, the grouting filling system also includes: a controller; a strain gauge, which is pasted on the outer wall of the first conveying pipe and electrically connected to the controller, and is used to detect the reflux pressure generated in the conveying pipe by the shock wave generated by the slurry reflux when the filling pump is reversed; a pressure regulating bottle, which is connected to the buffer tank through an air pipe, and a proportional adjustment solenoid valve is installed on the air pipe, and the proportional adjustment solenoid valve is connected to the controller; the controller detects the reflux pressure generated in the conveying pipe through the strain gauge, and when the reflux pressure is greater than the preset reflux pressure threshold, the controller controls the proportional adjustment solenoid valve to open a predetermined opening, so that the high-pressure gas in the pressure regulator enters the buffer tank, and the buffer tank is replenished with air and pressurized to block the slurry reflux in the second conveying pipe.

[0010] Optionally, a pressure sensor is provided in the buffer tank and is electrically connected to the controller; an acceleration sensor is provided at the connecting bend between the first conveying pipeline and the check valve and / or on the second conveying pipeline and is electrically connected to the controller, for collecting vibration data of the first conveying pipeline and / or the second conveying pipeline.

[0011] Optionally, the buffer tank is provided with an exhaust valve, and an exhaust pressure threshold of the exhaust valve is lower than an exhaust pressure threshold of the safety valve.

[0012] Optionally, a slurry discharge valve is provided on the side of the buffer tank, and the slurry discharge valve is electrically connected to the controller; and a sewage valve is provided at the bottom of the buffer tank.

[0013] Optionally, the tube cavity inside the steel braided hose and the cavity inside the buffer tank form a composite buffer cavity.

[0014] In a second aspect, an embodiment of the present invention further provides a grouting filling method for conveying slurry upward with a large height difference, comprising:

[0015] The hydraulic push rod of the filling pump moves in a first direction, and the slurry that has entered the filling pump is pumped to the first delivery pipe after passing through a check valve; the first delivery pipe is a flexible delivery pipe; the first delivery pipe performs a primary buffering of the pressure of the slurry through the expansion of its own side wall; the slurry flows into the buffer tank after passing through the first delivery pipe; the air in the buffer tank is compressed to perform a secondary buffering of the pressure of the slurry; the slurry flows into the second delivery pipe after passing through the buffer tank; the second delivery pipe transports the slurry upward.

[0016] Optionally, after the hydraulic push rod of the filling pump moves in the first direction and the slurry that has entered the filling pump is pumped into the first delivery pipe after passing through the check valve, the method further includes: the filling pump is reversed, the check valve is closed, the hydraulic push rod of the filling pump moves in the second direction, the pressure and slurry flow in the first delivery pipe are reduced, and the slurry in the second delivery pipe begins to flow back; it is determined whether the reflux pressure of the slurry is greater than a preset reflux pressure threshold; if the reflux pressure is greater than the preset reflux pressure threshold, the buffer tank is supplemented with air and pressurized to block the slurry in the second delivery pipe from flowing back.

[0017] Optionally, when the slurry in the second conveying pipe begins to backflow, the shock wave generated by the backflow increases the strain of the first conveying pipe; wherein, the judgment of whether the backflow pressure of the slurry is greater than the preset backflow pressure threshold includes: detecting the strain of the first conveying pipe by a strain gauge pasted on the outside of the first conveying pipe, and converting the detected strain into an electrical signal and transmitting it to the controller; the controller judges whether the backflow pressure of the slurry is greater than the preset backflow pressure threshold based on the electrical signal transmitted by the strain gauge.

[0018] The present invention provides a grouting system and method for conveying slurry upward over a large height difference. A check valve is connected to the outlet of a filling pump. One end of a first delivery pipeline is connected to the outlet of the check valve, and the other end is connected to a buffer tank. The buffer tank is connected to a second delivery pipeline for conveying slurry upward. When the filling pump is operating, it pulses the slurry through the check valve, sequentially delivering it to the first delivery pipeline, the buffer tank, and the second delivery pipeline. Since the first conveying pipe is a flexible conveying pipe, when the filling pump conveys the pulsed high-pressure slurry to the first conveying pipe through the check valve, the kinetic energy of the high-pressure pulse slurry can be buffered at the first level through the first conveying pipe, and the high-pressure slurry after the first-level buffering enters the buffer tank, and is buffered at the second level by the air compression in the buffer tank; in this way, the first conveying pipe as a flexible conveying pipe can be coordinated with the buffer tank to achieve two-level buffering of the high-pressure pulse slurry, which is beneficial to reduce the impact of the high-pressure pulse slurry on the transmission pipe, thereby playing a role of buffering and stabilizing pressure, so that the filling slurry in the conveying pipe tends to flow stably, and reduces the vibration caused by the slurry transportation; and the check valve connected to the outlet end of the filling pump can prevent the slurry backflow from adversely affecting the filling pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 Schematic diagram of the overall structure of a grouting filling system in one embodiment of the present invention;

[0021] Figure 2 A top view of the overall structure of a grouting filling system in one embodiment of the present invention;

[0022] Figure 3 Schematic diagram of a grouting filling method according to an embodiment of the present invention;

[0023] Figure 4 Schematic diagram of the working process of the grouting filling system in one embodiment of the present invention;

[0024] Figure 5 FIG. A is a partial enlarged view of the upper structure of a buffer tank in a grouting filling system according to an embodiment of the present invention;

[0025] Figure 6 FIG. B is a partial enlarged view of the lower structure of a buffer tank in a grouting filling system according to an embodiment of the present invention;

[0026] Figure 7 FIG3 is a partial enlarged view C of a pressure-stabilizing bottle in a grouting and filling system in one embodiment of the present invention. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0028] It should be understood that the embodiments described are only a portion of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative work are within the scope of protection of the present invention.

[0029] The grouting filling system and grouting filling method for conveying slurry upward over a large height difference provided in the embodiments of the present invention can reduce adverse effects on equipment and piping systems.

[0030] The present invention will be further described in detail below with reference to the accompanying drawings.

[0031] See Figure 1 、 Figure 2 and Figure 4As shown, the grouting filling system for conveying slurry upward with a large height difference provided in this embodiment includes a filling pump 1, the filling pump includes a piston cylinder, a hydraulic push rod and a piston connected to the hydraulic push rod, and the piston can reciprocate in the piston cylinder under the action of the hydraulic push rod; a check valve 2, the inlet end of the check valve 2 is connected to the outlet end of the filling pump 1; a first conveying pipe 3, the first conveying pipe 3 is a flexible conveying pipe, one end of the first conveying pipe 3 is connected to the outlet end of the check valve 2, and the other end is connected to the buffer tank 4; a safety valve 41 is provided on the buffer tank; a second conveying pipe 5, one end of the second conveying pipe 5 is connected to the buffer tank 4, and is used for conveying the filling slurry upward.

[0032] Among them, conveying slurry with a large height difference upward refers to conveying slurry when the height difference between the slurry output end and the inlet is more than 500 meters. The power and specifications of the filling pump can be selected according to the actual situation on site. The check valve is suitable for conveying media containing solid particles and high viscosity, and can withstand pressure within 16Mpa. It can be opened by the pressure of the slurry to allow the slurry to enter the first conveying pipeline, the buffer tank and the second conveying pipeline for conveying.

[0033] In some embodiments, the check valve can be a cone-type automatic check valve. The buffer tank body is made of forgings, which can reduce contact fatigue damage caused by the filling pump and extend the service life of the buffer tank. Compared with the use of air bags, the use of a buffer tank can simplify the operation process, reduce equipment failure rate and lower maintenance costs.

[0034] The grouting filling system provided by the present invention, for conveying slurry upward over a large height difference, comprises a check valve connected to the outlet of a filling pump. One end of a first delivery pipeline is connected to the outlet of the check valve, and the other end is connected to a buffer tank. The buffer tank is connected to a second delivery pipeline for conveying slurry upward. When the filling pump is operating, it pulses the slurry through the check valve, sequentially delivering it to the first delivery pipeline, the buffer tank, and the second delivery pipeline. Since the first conveying pipeline is a flexible conveying pipeline, when the filling pump conveys the pulsed high-pressure slurry to the first conveying pipeline through the check valve, the kinetic energy of the high-pressure pulse slurry can be buffered in the first stage (also called the first stage vibration reduction) through the first conveying pipeline. The high-pressure slurry after the first stage buffering enters the buffer tank, and the air in the buffer tank is compressed to convert the kinetic energy of the medium in the pipeline into pressure energy for secondary buffering (also called the second stage vibration reduction). In this way, the first conveying pipeline as a flexible conveying pipeline can be coordinated with the buffer tank to achieve two-stage buffering of the high-pressure pulse slurry, which is beneficial to reducing the impact of the high-pressure pulse slurry on the transmission pipeline, thereby playing a role of buffering and stabilizing pressure, so that the filling slurry in the conveying pipeline tends to flow stably, and reduces the vibration caused by slurry transportation.

[0035] When the high-pressure pulse slurry enters the second delivery pipeline after passing through the secondary buffering of the compressed air in the buffer tank, the filling pump 1 reverses its direction, closing the check valve connected to the outlet of the filling pump. At the same time, the compressed air in the buffer tank changes from a compressed state to a dynamic expansion process. During this process, it has a certain degree of reverse flow check effect on the backflow of the slurry that has entered the second delivery pipeline, preventing the backflow of slurry from adversely affecting the delivery pipeline and the filling pump. In addition, the safety valve installed on the buffer tank can open when the pressure in the tank exceeds the preset pressure, timely releasing the pressure to ensure the safety of the equipment.

[0036] See Figure 1 、 Figure 2 and Figure 6 In some embodiments, the first conveying pipeline 3 is a steel braided rubber hose 31 arranged in a curved state; wherein the steel braided rubber hose is a flexible conveying pipeline, which is woven from steel wires and combined with rubber. It has good flexibility resistance, fatigue resistance and pressure bearing capacity. Through the expansion of its own pipe diameter, it can absorb the pressure of the slurry, thereby playing a primary buffering role of the slurry pressure.

[0037] In other embodiments, the steel braided hose 31 can be in a curved state to guide the slurry to flow forward along the curved path formed by the inner wall of the steel braided hose, which can further enhance the blocking effect of the inner wall of the steel braided hose on the slurry, thereby further increasing the buffering of the slurry pressure.

[0038] See Figure 1 、 Figure 2 and Figure 7 In some embodiments, the grouting filling system also includes: a controller 6; a strain gauge 7, the strain gauge 7 is pasted on the outer wall of the first conveying pipe 3 and is electrically connected to the controller 6, and is used to detect the reflux pressure generated in the conveying pipe by the shock wave generated by the slurry reflux when the filling pump 1 is reversed; a pressure regulating bottle 8, the pressure regulating bottle 8 is connected to the buffer tank 4 through the air pipe 9, and a proportional adjustment solenoid valve 91 is installed on the air pipe, and the proportional adjustment solenoid valve 91 is connected to the controller 6; the controller 6 detects the reflux pressure generated in the conveying pipe through the strain gauge 7. When the reflux pressure is greater than the preset reflux pressure threshold, the controller 6 controls the proportional adjustment solenoid valve 91 to open a predetermined opening to allow the high-pressure gas in the pressure regulating bottle to enter the buffer tank 4, and replenish air and pressurize the buffer tank 4 to block the slurry reflux in the second conveying pipe 5.

[0039] Among them, the controller 6 uses the strain gauge 7 to collect the detected data when the first conveying pipeline 3 is conveying and reflowing. The shock wave generated by the slurry during reflow causes the strain of the first conveying pipeline 3 to suddenly increase. The strain gauge 7 attached to the outer wall of the first conveying pipeline 3 converts the detected strain size into an electrical signal and transmits it to the controller 6.

[0040] In some embodiments, the controller may include a data acquisition and processing module and a signal output module. The data acquisition and processing module in the controller may perform median filtering sampling processing on the collected strain gauge data to eliminate on-site interference sampling data and sudden changes, so that the collected data is closer to the actual situation.

[0041] Since the first conveying pipeline 3 is a flexible conveying pipeline, the strain gauge 7 is pasted on the outer wall of the first conveying pipeline 3, so as to more accurately detect the reflux pressure formed in the first conveying pipeline 3 by the shock wave generated by the slurry during reflux through the strain changes of the side wall of the first conveying pipeline 3.

[0042] In some embodiments, a plurality of strain gauges are used, which are pasted on both ends and the middle of the first conveying pipe 3 and the circumference of the pipe; wherein the circumference is the circumferential direction of the pipe, and 3-5 strain gauges are pasted adjacent to each other in the circumference of the pipe, and the 3-5 adjacent strain gauges are arranged in a ring shape on the outer circumference of the pipe.

[0043] The pressure stabilizing bottle 8 is used to adjust the pressure when the internal pressure of the buffer tank 4 is unbalanced. A manual ball valve 92 is also installed at the air outlet of the pressure stabilizing bottle 8. When the pressure stabilizing bottle 8 needs to be used or stopped, the manual ball valve 92 can be opened or closed.

[0044] When the controller 6 detects through the strain gauge 7 that the reflux pressure in the first conveying pipe 3 is greater than the preset reflux pressure threshold, the controller 6 sends a control signal to the proportional adjustment solenoid valve 91, controlling the proportional adjustment solenoid valve 91 to open a certain angle, replenishing air and pressurizing the pressure regulating tank 8, and blocking the slurry from reflux. If the reflux pressure is not greater than the preset reflux threshold, the proportional adjustment solenoid valve does not operate.

[0045] In some embodiments, the proportional regulating solenoid valve 91 is provided with three levels of opening. When the strain gauge electrically connected to the controller detects that the pressure exceeds the first level threshold, the controller sends a control signal to control the proportional regulating solenoid valve 91 to open the first opening (such as 20% opening); when the strain gauge electrically connected to the controller detects that the pressure exceeds the second level threshold, the controller sends a control signal to control the proportional regulating solenoid valve 91 to open the second opening (such as 50% opening); when the strain gauge electrically connected to the controller detects that the pressure exceeds the third level threshold, the controller sends a control signal to control the proportional regulating solenoid valve 91 to open the third opening (such as 70% opening).

[0046] In addition, the pressure-stabilizing bottle supplies air to the buffer tank. When the pumping pressure is not reached, the pressure-stabilizing bottle continues to supply air to the buffer tank to replenish the pressure. When the pressure sensor detects that the pumping pressure is reached, the pressure data is transmitted to the controller. The controller sends a control signal to close the proportional adjustment solenoid valve, and the pressure-stabilizing bottle stops supplying air, so that the pressure and flow in the pipeline tend to be balanced, thereby making the slurry flow stably and realizing the secondary buffering effect. The speed at which the pressure-stabilizing bottle replenishes the pressure to the buffer tank can be adjusted according to the strain size of the steel braided rubber hose to adjust the opening of the proportional adjustment solenoid valve to achieve rapid response.

[0047] In other embodiments, the opening of the proportional control solenoid valve 91 can be adjusted steplessly according to the change of the reflux pressure in the first delivery pipe 3 detected by the strain gauge from small to large, or from large to small.

[0048] See Figure 1 In some embodiments, the grouting filling system further includes a pressure sensor 42 and an acceleration sensor 10; the pressure sensor 42 is provided in the buffer tank 4 and is electrically connected to the controller 6; the acceleration sensor 10 is provided at the connecting elbow between the first delivery pipeline 3 and the check valve and / or on the second delivery pipeline 5 and is electrically connected to the controller 6, and is used to collect vibration data of the first delivery pipeline 3 and / or the second delivery pipeline 5, so as to more accurately determine the pressure in the buffer tank and the transmission pipeline. The acceleration sensor is a sensor that uses the piezoelectric effect to measure acceleration. When the acceleration sensor is subjected to acceleration, the mass block will be displaced by the force. The change in displacement causes the piezoelectric effect of the piezoelectric crystal, thereby generating an electric charge on the crystal. The charge is transmitted from the output interface of the acceleration sensor to the controller for signal processing. Based on the magnitude of the charge, the value of the acceleration can be calculated, thereby detecting the vibration amplitude of the delivery pipeline. The magnitude of the reflux pressure can be indirectly determined based on the vibration amplitude of the delivery pipeline.

[0049] In this embodiment, the controller can more accurately determine the reflux pressure of the slurry in the pipeline based on the data detected by the strain gauge 7, the data detected by the pressure sensor 42 and the data detected by the acceleration sensor 10, and thus can more accurately control the opening of the proportional adjustment solenoid valve 91.

[0050] See Figure 1 、 Figure 5 In some embodiments, an exhaust valve 43 is installed on the buffer tank 4, and the exhaust pressure threshold of the exhaust valve 43 is lower than the exhaust pressure threshold of the safety valve 41; wherein, when the pressure-stabilizing bottle 8 replenishes the pressure to the buffer tank 4 to exceed the normal pumping working pressure, the exhaust valve 43 is opened to exhaust to prevent the safety valve from opening by mistake.

[0051] See Figure 1 、 Figure 6In some embodiments, a slurry discharge valve 44 is provided on the side of the buffer tank 4, and the slurry discharge valve 44 is electrically connected to the controller 6; a drain valve 45 is provided at the bottom of the buffer tank 4; wherein the slurry discharge valve is electrically connected to the controller and can be controlled by the controller. When the filling pump stops working, the controller can send a signal to open the discharge valve, and the slurry can be discharged from the discharge valve; a drain valve is also provided at the bottom of the buffer tank. After the slurry transportation is completed, the interior of the tank body is not easy to clean, and the drain valve can be opened to discharge the accumulated material at the bottom of the buffer tank, thereby making the equipment cleaning more convenient.

[0052] See Figure 1 、 Figure 2 and Figure 6 In some embodiments, the lumen within the braided hose 31 and the cavity within the buffer tank 4 form a composite buffer cavity. Compared to buffering solely through the braided hose or the buffer tank, the composite buffer cavity provides a larger buffering space, thereby enhancing the buffering effect. Furthermore, the braided hose is flexible and, when conveying slurry, is more susceptible to expansion as the flow rate increases, allowing for more accurate detection of strain gauges attached to its outer surface. Furthermore, because the hose is flexible, the pipe wall offers less resistance to the slurry, allowing the acceleration sensor to more accurately detect changes in the slurry conveying velocity within the braided hose. The resulting acceleration value, processed by the controller, is more precise, allowing for more accurate detection of the pipeline's vibration amplitude.

[0053] In other embodiments, in addition to installing the acceleration sensor at the connecting bend between the check valve and the steel braided hose, an acceleration sensor is also installed on the second conveying pipe connected to the buffer tank; wherein, the acceleration sensor installed at the connecting bend detects the vibration amplitude before vibration reduction, and the acceleration sensor installed on the second conveying pipe detects the vibration amplitude after vibration reduction, and the data is transmitted to the controller, and the two sets of data are compared to judge the vibration reduction effect.

[0054] In addition, see Figure 1 In order to facilitate the lifting of the tank body, the buffer tank is also welded with two lifting ears 11.

[0055] In other embodiments, after the filling pump stops operating, the residual slurry in the first delivery pipeline flows back downward due to inertia. The pre-stored compression energy of the coil compression spring of the cone-shaped automatic check valve pushes the cone valve to close the flow pipeline, thereby preventing backflow. After the cone-shaped automatic check valve closes the flow pipeline, the controller opens the discharge valve on the side of the buffer tank to drain the residual slurry in the delivery pipeline into the drain.

[0056] See Figure 3 This embodiment further provides a grouting filling method for conveying slurry upward with a large height difference, which can be implemented using the above-mentioned grouting filling device. The method of this embodiment can include the following steps:

[0057] S11, the hydraulic push rod of the filling pump moves in a first direction, and the slurry that has entered the filling pump is pumped into the first delivery pipe after passing through the check valve; the first delivery pipe is a flexible delivery pipe;

[0058] S12, the first conveying pipe performs primary buffering on the pressure of the slurry by expanding its side wall;

[0059] S13, the slurry flows into the buffer tank after passing through the first delivery pipeline;

[0060] S14, compressing the air in the buffer tank to perform secondary buffering on the pressure of the slurry;

[0061] S15, the slurry flows into the second delivery pipeline after passing through the buffer tank;

[0062] S16. The second conveying pipe transports the slurry upward.

[0063] The embodiment of the present invention provides a grouting filling method for conveying slurry upward with a large height difference. The hydraulic push rod of the filling pump moves in a first direction, and the slurry that has entered the filling pump is pumped to the first conveying pipe after passing through the check valve; the first conveying pipe is a flexible conveying pipe. The first conveying pipe performs a primary buffering on the pressure of the slurry through the expansion of its own side wall. After passing through the first conveying pipe, the slurry flows into the buffer tank, and the air in the buffer tank is compressed to perform a secondary buffering on the pressure of the slurry. After passing through the buffer tank, the slurry flows into the second conveying pipe, and the second conveying pipe transmits the slurry in an upward direction, thereby playing a role of buffering and stabilizing pressure, so that the filling slurry in the conveying pipe tends to flow stably, reducing the vibration caused by slurry transportation; and the check valve connected to the outlet end of the filling pump can prevent the slurry backflow from adversely affecting the filling pump.

[0064] In some embodiments, after the hydraulic push rod of the filling pump moves in the first direction and the slurry that has entered the filling pump is pumped into the first delivery pipe after passing through the check valve, the method also includes: the filling pump reverses, the check valve closes, the hydraulic push rod of the filling pump moves in the second direction, the pressure and slurry flow in the first delivery pipe decrease, and the slurry in the second delivery pipe begins to flow back; it is determined whether the reflux pressure of the slurry is greater than a preset reflux pressure threshold; if the reflux pressure is greater than the preset reflux pressure threshold, the buffer tank is supplemented with air and pressurized to block the slurry in the second delivery pipe from flowing back.

[0065] In some embodiments, when the slurry in the second conveying pipe begins to backflow, the shock wave generated by the backflow increases the strain of the first conveying pipe; wherein, judging whether the backflow pressure of the slurry is greater than a preset backflow pressure threshold includes: detecting the strain of the first conveying pipe by a strain gauge pasted on the outside of the first conveying pipe, and converting the detected strain into an electrical signal and transmitting it to the controller; the controller judges whether the backflow pressure of the slurry is greater than the preset backflow pressure threshold based on the electrical signal transmitted by the strain gauge.

[0066] The technical features in the technical solutions of the method embodiments of the present application are the same as or similar to the technical features and technical effects of the system embodiments, and they can be specifically referenced to each other. The system is the grouting filling system described in any of the above embodiments.

[0067] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0068] The above content has briefly described the embodiments of the present invention in detail. Those skilled in the art can design and modify the device and its usage within the scope of the present invention according to on-site construction conditions.

[0069] Each embodiment in this specification is described in a related manner. The same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0070] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention are intended to be covered by the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A grouting filling system for conveying slurry upward with a large height difference, characterized in that: include: A charging pump, comprising a piston cylinder, a hydraulic push rod, and a piston connected to the hydraulic push rod, wherein the piston can reciprocate in the piston cylinder under the action of the hydraulic push rod; a check valve, wherein an inlet end of the check valve is connected to an outlet end of the filling pump; a first delivery pipeline, wherein the first delivery pipeline is a flexible delivery pipeline, one end of the first delivery pipeline is connected to the outlet end of the check valve, and the other end is connected to the buffer tank; the buffer tank is provided with a safety valve; a second conveying pipe, one end of which is connected to the buffer tank and is used to convey the filling slurry upward; The first delivery pipeline is a steel braided hose arranged in a curved state, and the lumen inside the steel braided hose and the cavity inside the buffer tank form a composite buffer cavity; When the filling pump delivers the slurry to the first delivery pipeline through the check valve, the kinetic energy of the slurry is buffered in the first stage through the first delivery pipeline. The slurry after the first stage of buffering enters the buffer tank. The kinetic energy of the medium in the first delivery pipeline is converted into pressure energy for secondary buffering through the air compression in the buffer tank. When the slurry enters the second delivery pipeline after the secondary buffering of the compressed air in the buffer tank, the filling pump switches to work, the check valve connected to the outlet end of the filling pump is closed, and the compressed air in the buffer tank changes from a compressed state to a dynamic expansion process.

2. The grouting filling system according to claim 1, characterized in that: Also includes: Controller; a strain gauge, which is attached to the outer wall of the first conveying pipe and is electrically connected to the controller, and is used to detect the reflux pressure generated in the first conveying pipe by the shock wave generated by the slurry reflux when the filling pump is reversed; A pressure-regulating bottle, the pressure-regulating bottle is connected to the buffer tank through an air pipe, a proportional adjustment solenoid valve is installed on the air pipe, and the proportional adjustment solenoid valve is connected to the controller; The controller detects the reflux pressure generated in the first conveying pipeline through the strain gauge. When the reflux pressure is greater than the preset reflux pressure threshold, the controller controls the proportional adjustment solenoid valve to open a predetermined opening to allow the high-pressure gas in the pressure-stabilizing bottle to enter the buffer tank, replenishing air and pressurizing the buffer tank to block the slurry backflow in the second conveying pipeline.

3. The grouting filling system according to claim 2, characterized in that: Also includes: a pressure sensor, the pressure sensor being disposed in the buffer tank and electrically connected to the controller; An acceleration sensor is provided at the connecting elbow between the first delivery pipeline and the check valve and / or on the second delivery pipeline, and is electrically connected to the controller for collecting vibration data of the first delivery pipeline and / or the second delivery pipeline.

4. The grouting filling system according to claim 1, characterized in that: The buffer tank is provided with an exhaust valve, and an exhaust pressure threshold of the exhaust valve is lower than an exhaust pressure threshold of the safety valve.

5. The grouting filling system according to claim 2, characterized in that: A slurry discharge valve is provided on the side of the buffer tank, and the slurry discharge valve is electrically connected to the controller; A drain valve is provided at the bottom of the buffer tank.

6. A grouting filling method for a grouting filling system for conveying slurry upward with a large height difference as claimed in any one of claims 1 to 5, characterized in that: include: The hydraulic push rod of the filling pump moves in a first direction, and the slurry that has entered the filling pump is pumped to the first delivery pipe after passing through the check valve; the first delivery pipe is a flexible delivery pipe; The first conveying pipe performs primary buffering on the pressure of the slurry through the expansion of its side wall; The slurry flows into the buffer tank after passing through the first delivery pipeline; The air in the buffer tank is compressed to provide secondary buffering for the pressure of the slurry; The slurry flows into the second delivery pipeline after passing through the buffer tank; The second conveying pipe conveys the slurry upward.

7. The grouting filling method according to claim 6, characterized in that: After the hydraulic push rod of the filling pump moves in the first direction and the slurry that has entered the filling pump is pumped into the first delivery pipeline after passing through the check valve, the method further includes: The filling pump works in reverse direction, the check valve closes, the hydraulic push rod of the filling pump moves in the second direction, the pressure and slurry flow in the first delivery pipeline decrease, and the slurry in the second delivery pipeline starts to flow back; Determining whether the reflux pressure of the slurry is greater than a preset reflux pressure threshold; If the reflux pressure is greater than a preset reflux pressure threshold, the buffer tank is supplemented with air and pressurized to block the slurry backflow in the second conveying pipeline.

8. The grouting filling method according to claim 7, characterized in that: When the slurry in the second conveying pipeline begins to flow back, the shock wave generated by the backflow increases the strain of the first conveying pipeline; Wherein, the determining whether the reflux pressure of the slurry is greater than a preset reflux pressure threshold comprises: Detecting the strain of the first conveying pipe by means of a strain gauge attached to the outside of the first conveying pipe, and converting the detected strain into an electrical signal and transmitting it to a controller; The controller determines whether the slurry return pressure is greater than a preset return pressure threshold value based on the electrical signal transmitted by the strain gauge.

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