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

Abstract

The embodiment of the invention discloses a grouting and filling system and a grouting and filling method for conveying slurry upwards at a large height difference, relates to the technical field of mine paste filling equipment, and aims to reduce the adverse effect of slurry conveying on equipment and a pipeline system. The filling pump comprises a piston cylinder, a hydraulic push rod and a piston connected with the hydraulic push rod; the inlet end of the check valve is communicated with the outlet end of the filling pump; the first conveying pipeline is a flexible conveying pipeline, one end of the first conveying pipeline is communicated with the outlet end of the check valve, and the other end of the first conveying pipeline is communicated with the buffer tank, so that when slurry enters the buffer tank through the first conveying pipeline, kinetic energy of the slurry is buffered through compression of reserved air in the buffer tank; a safety valve is arranged on the buffer tank; and one end of the second conveying pipeline is communicated with the buffer tank and is used for conveying the filling slurry upwards. The embodiment of the invention is suitable for the scene of upward large-height-difference slurry conveying.

Description

Technical Field

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

[0002] With the increasing development of human science and technology, the stability and safety of fluid transportation are becoming increasingly important in daily operations and engineering environments. More and more mines adopt filling mining methods, and the operating conditions faced by the projects have become complex and diverse. In particular, the working conditions of upward conveying with a large height difference (more than 500 meters) are increasing.

[0003] Under the working condition of upward conveying with a large height difference, at the moment of the filling industrial pump reversing, there are periodic pulses in the conveying flow rate and the slurry will have varying degrees of backflow. When the filling industrial pump stops pumping, the residual slurry in the conveying pipeline flows downward and backflows, generating a water hammer effect, which causes serious impacts on the filling industrial pump and the pipeline system, and there are great potential safety hazards. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a grouting filling system and a grouting filling method for upward conveying of slurry with a large height difference, which can reduce the adverse effects of slurry conveying on equipment and pipeline systems.

[0005] To achieve the above purpose, the present invention provides the following technical solutions: In the first aspect, an embodiment of the present invention provides a grouting filling system for upward conveying of slurry with a large height difference. The grouting filling system includes: A filling pump, the filling pump includes a piston cylinder, a hydraulic push rod and a piston connected to the hydraulic push rod. 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, the first conveying pipeline 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, so that when the slurry enters the buffer tank through the first conveying pipeline, the kinetic energy of the slurry is buffered by the compression of the reserved air in the buffer tank; a safety valve is provided on the buffer tank; a second conveying pipeline, one end of the second conveying pipeline is connected to the buffer tank and is used for upward conveying of the filling slurry.

[0006] Optionally, the first conveying pipeline is a steel braided rubber hose arranged in a bent state.

[0007] Optionally, the grouting filling system further includes: a controller; a strain gauge, which is pasted on the outer wall of the first conveying pipeline and electrically connected to the controller, and is used to detect the backflow pressure generated by the shock wave caused by the backflow of the slurry in the conveying pipeline when the filling pump changes its direction of operation; a pressure stabilizing bottle, which is connected to the buffer tank through an air pipe, and a proportional regulating solenoid valve is installed on the air pipe, and the proportional regulating solenoid valve is connected to the controller; the controller detects the backflow pressure generated in the conveying pipeline through the strain gauge, and when the backflow pressure is greater than a preset backflow pressure threshold, the controller controls the proportional regulating solenoid valve to open a predetermined opening degree, so that the high-pressure gas in the pressure stabilizing bottle enters the buffer tank to supplement air and increase the pressure of the buffer tank, so as to block the backflow of the slurry in the second conveying pipeline.

[0008] Optionally, a pressure sensor, which is arranged in the buffer tank and electrically connected to the controller; an acceleration sensor, which is arranged at the connecting elbow of the first conveying pipeline and the check valve and / or on the second conveying pipeline and electrically connected to the controller, and is used to collect the vibration data of the first conveying pipeline and / or the second conveying pipeline.

[0009] Optionally, an exhaust valve is installed on the buffer tank, and the exhaust pressure threshold of the exhaust valve is less than the exhaust pressure threshold of the safety valve.

[0010] Optionally, a slurry discharge valve is arranged on the side of the buffer tank, and the slurry discharge valve is electrically connected to the controller; a sewage discharge valve is arranged at the bottom of the buffer tank.

[0011] Optionally, the lumen inside the steel braided rubber hose and the cavity inside the buffer tank form a composite buffer cavity.

[0012] In a second aspect, an embodiment of the present invention further provides a grouting filling method for transporting slurry with a large upward height difference, including: The hydraulic push rod of the filling pump moves in a first direction to pump the slurry that has entered the filling pump through the check valve into the first conveying pipeline; the first conveying pipeline is a flexible conveying pipeline; the first conveying pipeline buffers 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 conveying pipeline; the air in the buffer tank is compressed to buffer the pressure of the slurry at a secondary level; the slurry flows into the second conveying pipeline after passing through the buffer tank; the second conveying pipeline transports the slurry in an upward direction.

[0013] Optionally, after the hydraulic push rod of the filling pump moves in the first direction to pump the slurry that has entered the filling pump through the check valve to the first conveying pipeline, the method further includes: the filling pump changes its working direction, the check valve closes, the hydraulic push rod of the filling pump moves in the second direction, the pressure and slurry flow rate in the first conveying pipeline decrease, and the slurry in the second conveying pipeline begins to flow back; determining whether the backflow pressure of the slurry is greater than a preset backflow pressure threshold; if the backflow pressure is greater than the preset backflow pressure threshold, air is supplemented and pressurized to the buffer tank to block the backflow of the slurry in the second conveying pipeline.

[0014] Optionally, 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 backflow pressure of the slurry is greater than a preset backflow pressure threshold includes: detecting the strain of the first conveying pipeline through a strain gauge pasted on the outside of the first conveying pipeline, and converting the detected strain into an electrical signal and transmitting it to the controller; the controller determines whether the backflow pressure of the slurry is greater than the preset backflow pressure threshold according to the electrical signal transmitted by the strain gauge.

[0015] The grouting and filling system and grouting and filling method for upward large-height difference slurry transportation provided by the present invention are connected with a check valve at the outlet end of the filling pump. One end of the first conveying pipeline is communicated with the outlet end of the check valve, and the other end is communicated with the buffer tank. The buffer tank is communicated with the second conveying pipeline for upwardly transporting the filling slurry. When the filling pump works, the filling pump sequentially transports the slurry to the first conveying pipeline, the buffer tank and the second conveying pipeline through the check valve in a pulsed manner. Since the first conveying pipeline is a flexible conveying pipeline, when the filling pump transports the pulsed high-pressure slurry to the first conveying pipeline through the check valve, the kinetic energy of the high-pressure pulsed slurry can be buffered at the first level through the first conveying pipeline. The high-pressure slurry after the first-level buffer enters the buffer tank and is buffered at the second level through the air compression in the buffer tank; in this way, the first conveying pipeline as a flexible conveying pipeline and the buffer tank can be cooperated to realize two-level buffering of the high-pressure pulsed slurry, which is beneficial to reducing the impact of the high-pressure pulsed slurry on the conveying pipeline, thereby playing a role in buffering and stabilizing the pressure, making the filling slurry in the conveying pipeline tend to flow stably, and reducing the vibration generated by the slurry transportation; and the check valve connected to the outlet end of the filling pump can prevent the backflow of the slurry from having an adverse impact on the filling pump. Description of the Drawings

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0017] Figure 1 Schematic diagram of the overall structure of the grouting filling system in an embodiment of the present invention; Figure 2 Top view of the overall structure of the grouting filling system in an embodiment of the present invention; Figure 3 Schematic flow chart of the grouting filling method in an embodiment of the present invention; Figure 4 Schematic diagram of the working process of the grouting filling system in an embodiment of the present invention; Figure 5 Partial enlarged view A of the upper structure of the buffer tank in the grouting filling system in an embodiment of the present invention; Figure 6 Partial enlarged view B of the lower structure of the buffer tank in the grouting filling system in an embodiment of the present invention; Figure 7 Partial enlarged view C of the pressure stabilizing bottle in the grouting filling system in an embodiment of the present invention. Detailed implementation manners

[0018] The following will describe the embodiments of the present invention in detail with reference to the accompanying drawings.

[0019] It should be clear that the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0020] The grouting filling system and grouting filling method provided by the embodiments of the present invention for transporting slurry with a large upward height difference can reduce the adverse effects on the equipment and pipeline system.

[0021] The following will further describe the present invention in detail with reference to the accompanying drawings.

[0022] See Figure 1 、 Figure 2 and Figure 4As shown in the figure, the grouting filling system provided in this embodiment for upward slurry transportation with a large height difference 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. 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 pipeline 3, the first conveying pipeline 3 is a flexible conveying pipeline, one end of the first conveying pipeline 3 is connected to the outlet end of the check valve 2, and the other end is connected to a buffer tank 4, so that when the slurry enters the buffer tank 4 through the first conveying pipeline 3, the kinetic energy of the slurry is buffered by the compression of the reserved air in the buffer tank 4; a safety valve 41 is provided on the buffer tank 4; a second conveying pipeline 5, one end of the second conveying pipeline 5 is connected to the buffer tank 4 and is used for transporting the filling slurry in the upward direction.

[0023] Among them, upward slurry transportation with a large height difference refers to slurry transportation in the case where 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 transporting media containing solid particles and having a relatively high viscosity, and can withstand a pressure within 16 Mpa. It can be opened by the pressure of the slurry to enable the slurry to enter the first conveying pipeline, the buffer tank, and the second conveying pipeline for transportation.

[0024] In some embodiments, a cone valve type automatic check valve can be selected as the check valve. The tank body material of the buffer tank is a forging, which can reduce contact fatigue damage caused by the filling pump, extend the service life of the buffer tank, and compared with using an air bag, using a buffer tank can reduce the operation process, reduce the failure rate of the equipment, and lower the maintenance cost.

[0025] The grouting and filling system provided by the present invention for upward conveying of slurry with a large height difference is connected with a check valve at the outlet end of the filling pump. One end of the first conveying pipeline is communicated with the outlet end of the check valve, and the other end is communicated with a buffer tank. The buffer tank is communicated with a second conveying pipeline for upward conveying of filling slurry. When the filling pump works, the filling pump conveys the slurry to the first conveying pipeline, the buffer tank and the second conveying pipeline in sequence through the check valve in a pulsed manner. 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 pulsed slurry can be buffered at the first level (also known as the first-level vibration reduction) through the first conveying pipeline. The high-pressure slurry after the first-level buffer enters the buffer tank, and through the air compression in the buffer tank, the kinetic energy of the medium in the pipeline is converted into pressure energy for the second-level buffer (also known as the second-level vibration reduction). In this way, through the cooperation of the first conveying pipeline as a flexible conveying pipeline and the buffer tank, two-level buffering of the high-pressure pulsed slurry can be realized, which is beneficial to reducing the impact of the high-pressure pulsed slurry on the transmission pipeline, thus playing a role in buffering and stabilizing the pressure, making the filling slurry in the conveying pipeline tend to flow stably, and reducing the vibration generated by the slurry conveying.

[0026] After the high-pressure pulsed slurry enters the second conveying pipeline after the second-level buffer of the compressed air in the buffer tank, the filling pump 1 reverses its operation, and the check valve connected to the outlet end of the filling pump is closed. At the same time, the compressed air in the buffer tank changes from the compressed state to the dynamic expansion process. During this process, it plays a certain role in preventing the backflow of the slurry that has entered the second conveying pipeline, and can prevent the adverse effects of the slurry backflow on the conveying pipeline and the filling pump. In addition, the safety valve provided on the buffer tank can be opened when the pressure in the tank body is greater than the preset pressure to release the pressure in time, ensuring the safety of the equipment.

[0027] 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 bent state. Among them, the steel braided rubber hose is a flexible conveying pipeline, which is woven by steel wires and combined with rubber, and has good flexural resistance, fatigue resistance and pressure-bearing capacity. Through the expansion of its own pipe diameter, it can absorb the pressure of the slurry, thus playing a role in the first-level buffer of the slurry pressure.

[0028] In other embodiments, the steel braided rubber hose 31 can be in a bent state to guide the slurry to flow forward along the curved path formed by the inner wall of the steel braided rubber hose, which can further enhance the blocking effect of the inner wall of the steel braided rubber hose on the slurry, and thus can further increase the buffer of the slurry pressure.

[0029] See Figure 1 、 Figure 2 and Figure 7, in some embodiments, the grouting filling system further includes: a controller 6; a strain gauge 7, which is pasted on the outer wall of the first conveying pipeline 3 and electrically connected to the controller 6, and is used to detect the backflow pressure generated by the shock wave caused by the backflow of the slurry in the conveying pipeline when the filling pump 1 changes its working direction; a pressure stabilizing bottle 8, which is connected to the buffer tank 4 through an air pipe 9, and a proportional regulating solenoid valve 91 is installed on the air pipe, and the proportional regulating solenoid valve 91 is connected to the controller 6; the controller 6 detects the backflow pressure generated in the conveying pipeline through the strain gauge 7, and when the backflow pressure is greater than the preset backflow pressure threshold, the controller 6 controls the proportional regulating solenoid valve 91 to open a predetermined opening degree, so that the high-pressure gas in the pressure stabilizing bottle enters the buffer tank 4 to supplement air and increase the pressure of the buffer tank 4, so as to block the backflow of the slurry in the second conveying pipeline 5.

[0030] Among them, the controller 6 uses the strain gauge 7 to collect the detected data when the first conveying pipeline 3 is conveying and backflowing. The shock wave generated when the slurry backflows causes the strain of the first conveying pipeline 3 to increase suddenly. The strain gauge 7 pasted on the outer wall of the first conveying pipeline 3 converts the detected strain magnitude into an electrical signal and transmits it to the controller 6.

[0031] 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 can perform median filtering sampling processing on the data collected by the strain gauge, exclude the on-site interference sampling data and mutation effects, and make the collected data closer to the actual situation.

[0032] Since the first conveying pipeline 3 is a flexible conveying pipeline and the strain gauge 7 is pasted on the outer wall of the first conveying pipeline 3, it is convenient to more accurately detect the backflow pressure formed by the shock wave generated by the slurry backflow in the first conveying pipeline 3 through the strain change on the side wall of the first conveying pipeline 3.

[0033] In some embodiments, the number of strain gauges used is multiple, and they are pasted at both ends, the middle part and the circumferential direction of the first conveying pipeline 3; among them, the circumferential direction is the circumferential direction of the pipeline, and 3-5 strain gauges are pasted adjacent to each other in the circumferential direction of the pipeline. The 3-5 adjacent strain gauges are arranged in a ring on the outer peripheral surface of the pipeline.

[0034] The pressure stabilizing bottle 8 is adjusted 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 it is necessary to use or stop using the pressure stabilizing bottle 8, just open or close the manual ball valve 92.

[0035] When the controller 6 detects that the backflow pressure in the first conveying pipeline 3 is greater than the preset backflow pressure threshold through the strain gauge 7, the controller 6 sends a control signal to the proportional regulating solenoid valve 91 to control the proportional regulating solenoid valve 91 to open at a certain angle, replenish air and increase pressure in the pressure stabilizing tank 8, and block the slurry from flowing back. If the backflow pressure is not greater than the preset backflow threshold, the proportional regulating solenoid valve does not act.

[0036] In some embodiments, the proportional regulating solenoid valve 91 has three levels of opening degrees. 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 degree (such as 20% opening degree); 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 degree (such as 50% opening degree); 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 degree (such as 70% opening degree).

[0037] In addition, the pressure stabilizing bottle supplies air to the inside of the buffer tank. When the pumping pressure is not reached, the pressure stabilizing bottle continues to supply air to the buffer tank to replenish pressure. When the pressure sensor detects that the pumping pressure is reached, it transmits the pressure data to the controller, and the controller sends a control signal to close the proportional regulating solenoid valve, and the pressure stabilizing bottle stops supplying air, so that the pressure and flow rate in the pipeline tend to be balanced, so that the slurry flows stably, realizing the secondary buffering function. The speed at which the pressure stabilizing bottle replenishes pressure to the buffer tank can adjust the opening degree of the proportional regulating solenoid valve according to the strain size of the steel braided rubber hose to achieve rapid response.

[0038] In some other embodiments, the opening degree of the proportional regulating solenoid valve 91 can be steplessly adjusted according to the change of the backflow pressure in the first conveying pipeline 3 detected by the strain gauge from small to large or from large to small.

[0039] 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 disposed in the buffer tank 4 and electrically connected to the controller 6; the acceleration sensor 10 is disposed at the connecting elbow of the first conveying pipeline 3 and the check valve and / or on the second conveying pipeline 5 and electrically connected to the controller 6, and is used to collect the vibration data of the first conveying pipeline 3 and / or the second conveying pipeline 5, so as to more accurately determine the pressure in the buffer tank and the conveying pipeline. The acceleration sensor is a sensor that measures acceleration using the piezoelectric effect. When the acceleration sensor is subjected to acceleration, the mass block will be subjected to a force and displace, and the change in displacement causes the piezoelectric effect of the piezoelectric crystal, thereby generating charge on the crystal. The charge is transmitted from the output interface of the acceleration sensor to the controller for signal processing. According to the magnitude of the charge, the value of the acceleration can be calculated, so that the vibration amplitude of the conveying pipeline can be detected, and the magnitude of the reflux pressure can be indirectly determined according to the vibration amplitude of the conveying pipeline.

[0040] In this embodiment, the controller can more accurately determine the magnitude of the reflux pressure of the slurry in the pipeline according to 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 further can more accurately control the opening degree of the proportional regulating solenoid valve 91.

[0041] 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 less than the exhaust pressure threshold of the safety valve 41; wherein, when the pressure stabilizing bottle 8 replenishes the pressure of the buffer tank 4 to exceed the normal pumping working pressure, the exhaust valve 43 is opened for exhaust to prevent the safety valve from being accidentally opened.

[0042] See Figure 1 , Figure 6 , in 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 sewage discharge 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 through the controller. When the filling pump stops working, a signal can be sent through the controller to open the discharge valve, and the slurry can be discharged from the discharge valve; a sewage discharge valve is also provided at the bottom of the buffer tank. After the slurry conveying is completed, it is not easy to clean the inside of the tank body, and the sewage discharge valve can be opened to discharge the accumulated material at the bottom of the buffer tank, thereby making the equipment cleaning more convenient.

[0043] See Figure 1 , Figure 2 and Figure 6, in some embodiments, the lumen inside the steel braided rubber hose 31 and the cavity inside the buffer tank 4 form a composite buffer cavity; compared with buffering only through the space of the steel braided rubber hose or only through the buffer tank, the composite buffer cavity has a larger buffer space, which is beneficial to enhancing the buffering effect. And the steel braided rubber hose is a flexible hose. When conveying the slurry, it is easier to expand when the flow rate increases, so that the strain gauge pasted on its outer surface can be detected more accurately. In addition, because it is a flexible hose, the resistance of the pipe wall to the slurry is smaller, and the acceleration sensor can more accurately detect the change in the conveying speed of the slurry in the steel braided rubber hose. The acceleration value obtained after being processed by the controller is more accurate, so as to more accurately detect the vibration amplitude of the conveying pipeline.

[0044] In some other embodiments, in addition to installing the acceleration sensor at the connecting elbow of the check valve and the steel braided rubber hose, an acceleration sensor is also installed on the second conveying pipeline connected to the buffer tank; among them, the acceleration sensor installed at the connecting elbow detects the vibration amplitude before vibration reduction, and the acceleration sensor installed on the second conveying pipeline detects the vibration amplitude after vibration reduction, and transmits the data to the controller, and compares the two sets of data to judge the vibration reduction effect.

[0045] In addition, referring to Figure 1 , in order to facilitate the hoisting of the tank body, two lifting lugs 11 are also welded on the buffer tank.

[0046] In some other embodiments, after the filling pump stops working, the residual slurry material in the first conveying pipeline flows downward due to inertia. The pre-stored compression amount of the spiral compression spring of the cone valve type automatic check valve can push the cone valve to close the material flow pipeline, so as to achieve the check purpose. After the cone valve type automatic check valve closes the material flow pipeline, the controller opens the discharge valve on the side of the buffer tank to discharge the residual slurry material in the conveying pipeline into the drainage ditch.

[0047] Referring to Figure 3 , this embodiment also provides a grouting and filling method for upward large height difference conveying of slurry, which can be realized by using the above-mentioned grouting and filling device. The method of this embodiment may include the following steps: S11. The hydraulic push rod of the filling pump moves in the first direction, and pumps the slurry that has entered the filling pump through the check valve to the first conveying pipeline; the first conveying pipeline is a flexible conveying pipeline; S12. The first conveying pipeline performs a primary buffer on the pressure of the slurry through the expansion of its own side wall; S13. The slurry flows into the buffer tank after passing through the first conveying pipeline; S14. The air in the buffer tank is compressed to perform a secondary buffer on the pressure of the slurry; S15. The slurry flows into the second conveying pipeline after passing through the buffer tank; S16. The second conveying pipeline conveys the slurry in an upward direction.

[0048] In the grouting filling method for upward high - elevation difference conveying of slurry provided by the embodiment of the present invention, the hydraulic push rod of the filling pump moves in a first direction, and the slurry that has entered the filling pump is pumped through a check valve into the first conveying pipeline; the first conveying pipeline is a flexible conveying pipeline, and through the expansion of its own side wall, the pressure of the slurry is buffered at the first level. After passing through the first conveying pipeline, the slurry flows into a buffer tank, and the air in the buffer tank is compressed to buffer the pressure of the slurry at the second level. After passing through the buffer tank, the slurry flows into the second conveying pipeline, and the second conveying pipeline conveys the slurry in an upward direction, thus playing a role in buffering and stabilizing the pressure, making the filling slurry in the conveying pipeline tend to flow stably and reducing the vibration generated by slurry conveying; and the check valve connected to the outlet end of the filling pump can prevent the backflow of the slurry from having an adverse impact on the filling pump.

[0049] In some embodiments, after the hydraulic push rod of the filling pump moves in a first direction and pumps the slurry that has entered the filling pump through a check valve into the first conveying pipeline, the method further includes: the filling pump changes its working direction, the check valve closes, the hydraulic push rod of the filling pump moves in a second direction, the pressure and slurry flow rate in the first conveying pipeline decrease, and the slurry in the second conveying pipeline starts to flow back; it is judged whether the backflow pressure of the slurry is greater than a preset backflow pressure threshold; if the backflow pressure is greater than the preset backflow pressure threshold, air is supplemented and pressurized to the buffer tank to block the backflow of the slurry in the second conveying pipeline.

[0050] In some embodiments, when the slurry in the second conveying pipeline starts to flow back, the shock wave generated by the backflow increases the strain of the first conveying pipeline; among them, judging whether the backflow pressure of the slurry is greater than a preset backflow pressure threshold includes: detecting the strain of the first conveying pipeline through a strain gauge pasted on the outside of the first conveying pipeline, and converting the detected strain into an electrical signal and transmitting it to a controller; the controller judges whether the backflow pressure of the slurry is greater than the preset backflow pressure threshold according to the electrical signal transmitted by the strain gauge.

[0051] The technical features in the technical solution of the method embodiment of the present application are the same as or similar to the technical features and technical effects of the system embodiment, and can be specifically referred to each other. The system is the grouting filling system described in any of the above embodiments.

[0052] It should be noted that in this text, relational terms such as first and second are only used 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 "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0053] The above has described in detail the embodiments of the present invention. Those skilled in the art can design and modify the device and its usage mode within the scope of the present invention according to the on-site construction situation.

[0054] Each embodiment in this specification is described in a related manner. For the same and similar parts between the embodiments, reference can be made to each other. Each embodiment focuses on the differences from other embodiments.

[0055] The above is only the specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A grouting filling system for conveying slurry upward with a large height difference, characterized in that: include: A filling pump, the filling pump comprising a piston cylinder, a hydraulic push rod and a piston connected to the hydraulic push rod, the piston being able to reciprocate in the piston cylinder under the action of the hydraulic push rod; a check valve, wherein the inlet end of the check valve is connected to the 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, so that when the slurry enters the buffer tank through the first delivery pipeline, the kinetic energy of the slurry is buffered by compressing the reserved air in the buffer tank; a safety valve is provided on the buffer tank; A second conveying pipeline, one end of which is connected to the buffer tank, is used to convey the filling slurry upward.

2. The grouting filling system according to claim 1, characterized in that: The first delivery pipeline is a steel braided rubber hose arranged in a curved state.

3. 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 pipeline and is electrically connected to the controller, and is used to detect the reflux pressure generated in the conveying pipeline by the shock wave generated by the slurry reflux when the filling pump is switched; A pressure-stabilizing bottle, the pressure-stabilizing bottle is connected to the buffer tank through an air pipe, a proportional regulating solenoid valve is installed on the air pipe, and the proportional regulating solenoid valve is connected to the controller; The controller detects the reflux pressure generated in the conveying pipeline through the strain gauge. When the reflux pressure is greater than a preset reflux pressure threshold, the controller controls the proportional regulating solenoid valve to open a predetermined opening to allow the high-pressure gas in the pressure regulating bottle to enter the buffer tank, replenishing gas and pressurizing the buffer tank to block the reflux of slurry in the second conveying pipeline.

4. The grouting filling system according to claim 3, 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 arranged at the connecting elbow 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.

5. 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.

6. The grouting filling system according to claim 3, 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.

7. The grouting filling system according to claim 2, characterized in that: The tube cavity inside the steel braided rubber hose and the cavity inside the buffer tank form a composite buffer cavity.

8. A grouting filling method for conveying slurry upward with a large height difference, 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 pipeline after passing through the check valve; the first delivery pipeline is a flexible delivery pipeline; The first conveying pipeline 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 perform secondary buffering on 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.

9. The grouting filling method according to claim 8, 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 to the first delivery pipeline after passing through the check valve, the method further includes: The filling pump works in reverse direction, 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 pipeline are reduced, 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 reflux in the second conveying pipeline.

10. The grouting filling method according to claim 9, characterized in that: When the slurry in the second conveying pipeline starts 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 pipeline by means of a strain gauge attached to the outside of the first conveying pipeline, 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 according to the electrical signal transmitted by the strain gauge.

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