High-concentration tailing filling back line extension pressure-relief-free automatic exhaust system

Abstract

According to the high-concentration tailing filling back line extension pressure-relief-free automatic exhaust system, the height of a filling pipeline is H, the length of the filling pipeline is L1, a pressure container and a dense slurry range extending pump are sequentially installed in series at the position where the back pressure coefficient H: L of the filling pipeline is 1: 6, and L1 is larger than L; when the pressure in the pressure container exceeds a design value, the rupture disk is ruptured; the two-way pressure controller displays the pressure of the container and controls the electromagnetic valve to open and close according to a set value; the electrodes comprise the high-level electrode and the low-level electrode, and the height of mortar in the pressure container is detected so as to provide a signal for the electromagnetic valve, so that automatic exhaust is realized. According to the utility model, safe, stable, reliable and automatic exhaust can be realized; the backpressure coefficient of the self-flow filling is increased, so that the filling range is expanded, the use range of the self-flow filling is expanded, and filling auxiliary facilities such as underground chambers and hydraulic pressure are omitted; and under the condition that least equipment is additionally arranged at the tail end of an original filling pipeline, the filling cost is reduced, the filling speed is increased, the enterprise burden is relieved, and the enterprise benefits are increased.

Description

Technical Field

[0001] The utility model belongs to the technical field of devices for filling filling materials in underground mining areas of fixed buildings, and in particular relates to an automatic exhaust system for high-concentration tailings filling backline extension without pressure relief. Background Art

[0002] Tailings filling technology refers to filling the tailings produced in the mineral processing process into the mine cavity, thereby effectively reducing the discharge of tailings and avoiding environmental pollution. At the same time, it can also fill the mine cavity and increase underground stability.

[0003] Tailings filling technology has gone through the following stages: Initial stage, the earliest mine filling technology began in the early 20th century, mainly using tailings or waste rock for filling. Development stage, in the middle of the 20th century, with the development of the mining industry, mine filling technology has gradually received attention, and some new filling processes and technical means have emerged. Innovation stage, from the late 20th century to the early 21st century, with the improvement of environmental protection awareness and the increasing depletion of mineral resources, the filling management of old goafs and the promotion of filling mining methods, mine filling technology has entered an innovation stage, and many new efficient and environmentally friendly filling technologies have emerged. Improvement stage, in recent years, with the continuous development of science and technology, mine filling technology has been further improved and perfected, which has improved mining efficiency and filling effects, while reducing equipment costs and environmental pollution.

[0004] At present, tailings filling is generally divided into two types, one is pressure filling and the other is gravity filling. Gravity filling is more widely used than pressure filling, although gravity filling has various restrictions, but it has the advantages of less equipment investment and low operating costs.

[0005] Under the existing technology, the concentration of high-concentration tailings in mines is 70% ± 2%, which is generally the concentration after adding cement, binder, aggregate, etc. According to the design specifications, during gravity filling, the back pressure coefficient is generally controlled at 6.5, that is, the gravity filling with a vertical height of 1m can flow a horizontal distance of 6.5m by itself; if it exceeds this range, it is necessary to change from gravity filling to pressure filling. However, if it is changed to pressure filling, it is inevitable to increase pressure filling facilities and build filling pump groups, and it is also necessary to equip underground chambers, silos, cleaning, hydraulic and other filling auxiliary facilities, which leads to a substantial increase in equipment investment and costs, and it is difficult to increase the filling speed, which greatly increases the burden on enterprises and reduces their benefits. In this regard, the following improved technical solutions are proposed. Utility Model Content

[0006] The utility model solves the technical problem of providing an automatic exhaust system for high-concentration tailings filling backline extension without pressure relief, thereby solving the technical problems of high investment cost and heavy burden on enterprises of high-concentration tailings filling equipment under the prior art.

[0007] The technical solution adopted by the utility model is: an automatic exhaust system for extending the back line of high-concentration tailings filling without depressurization, including a filling station at a high position and a goaf area at a low position, and also includes a filling pipeline; the filling pipeline connects the filling station and the goaf, and the filling pipeline consists of a vertical part and a horizontal part.

[0008] The first improvement of the utility model is that the starting end of the vertical part of the filling pipeline is connected to the filling station, and the height of the vertical part is H; the end of the horizontal part of the filling pipeline is connected to the goaf, and the length of the horizontal part is L1, and the pressure vessel and the thick slurry extender pump are installed in series first and then at the position of the aforementioned filling pipeline back pressure coefficient H:L=1:6, where L1>L.

[0009] The second improvement of the utility model is that the pressure vessel has a bursting disc, a two-way pressure controller, a solenoid valve, and electrodes; when the pressure in the pressure vessel exceeds the design value, the bursting disc ruptures; in addition to being used to display the pressure of the pressure vessel, the two-way pressure controller controls the opening and closing of the solenoid valve according to the set value; the electrodes include high-position electrodes and low-position electrodes arranged at different heights in the pressure vessel tank body, and the high-position electrodes and the low-position electrodes are used to detect the mortar height in the pressure vessel and provide control signals to the solenoid valve.

[0010] Among the above technical solutions, as the preferred technical solution of the utility model: the pressure vessel has a pressure resistance of 2.0MPa; the pressure vessel has a diameter of φ700mm and a height of 2300mm; wherein H:L1=1:9-10; and the output pressure of the thick slurry range extender pump is 0.4-0.8MPa.

[0011] In the above technical scheme, as a further improvement of the utility model: the electrode is not normally energized, and the electrode is energized only when and if the two-way pressure controller detects that the pressure in the pressure vessel reaches a set value; the set value is half of the pressure resistance design value of the pressure vessel during normal filling; when the low-position electrode detects a potential signal, the solenoid valve opens; when the high-position electrode detects a potential signal, the solenoid valve closes.

[0012] Among the above technical schemes, as the preferred technical scheme of the utility model: the bursting disc, the two-way pressure controller, and the solenoid valve are arranged on the top of the pressure vessel; the electrodes are arranged at different heights in the pressure vessel tank; the left and right sides of the bottom end of the pressure vessel are respectively provided with sealing pipe joints, and the pressure vessel is respectively connected to the filling pipe outlet and the thick slurry range extender pump inlet through the sealing pipe joints.

[0013] Among the above technical solutions, as the preferred technical solution of the utility model: the exhaust time of each exhaust after the solenoid valve is opened is 2 to 3 seconds.

[0014] In the above technical scheme, as a further improvement of the utility model: the thick slurry range extender pump includes a slurry inlet reducer pipe vertically arranged at the top of the pump body and a slurry outlet reducer pipe horizontally arranged at the side of the pump body; in addition, the thick slurry range extender pump also includes an electric lubricating grease pump; the electric lubricating grease pump and the thick slurry range extender pump are assembled together as a whole; and the electric lubricating grease pump works first, and the thick slurry range extender pump works later; and every time the thick slurry range extender pump works for a period of time, a certain amount of grease is injected into the thick slurry range extender pump through the electric lubricating grease pump.

[0015] In the above technical scheme, as a further improvement of the utility model: the thick slurry range extender pump also includes a frequency converter and a time control cabinet; the frequency converter is connected to the thick slurry range extender pump and controls the start and stop of the thick slurry range extender pump; the time control cabinet is connected to the thick slurry range extender pump and the electric lubricating grease pump and controls the operating time of the thick slurry range extender pump and the electric lubricating grease pump.

[0016] In the above technical scheme, as a further improvement of the utility model: the thick slurry range extender pump has a power sub-impeller, a packing sealing structure and a pressure reducing cover; the packing sealing structure includes a plurality of rotating shaft lip sealing rings; the pump shaft of the thick slurry range extender pump is coaxially adapted to install the shaft sleeve; the outer side of the shaft sleeve is provided with a first packing pad, a rotating shaft lip sealing ring, a water seal ring, a rotating shaft lip sealing ring, a second packing pad, a rotating shaft lip sealing ring, and a third packing pad in sequence along its axial direction; the longitudinal sections of the first packing pad and the third packing pad are both right-angled trapezoidal structures, and the first packing pad and the third packing pad are symmetrically arranged front and rear along the axial direction; the outer edge of the rotating shaft lip sealing ring is connected to the grease interface; the grease interface is arranged at an angle, and the grease interface is connected to the electric grease pump.

[0017] The advantages of this utility model compared with the prior art:

[0018] 1. The utility model can increase the back pressure coefficient of gravity filling to 1:9-10, that is, the filling range is expanded by 38.5-53.9%, which greatly expands the application scope of gravity filling and eliminates the filling auxiliary facilities such as underground chambers and hydraulics; and at the end of the original filling pipeline, with the least amount of equipment added, it reduces the filling cost, increases the filling speed, reduces the burden on the enterprise, and increases the enterprise's benefits.

[0019] 2. One side of the pressure vessel of the utility model is sealed and connected to the filling pipe, and the other side is sealed and connected to the inlet of the concentrated slurry range extender pump; when the mortar in the filling pipe flows through the pressure vessel, due to the sudden increase of air, the air originally dispersed in the mortar will gather upward in the pressure vessel, and under the push of the subsequent mortar, a part of the mortar also enters the pressure vessel at the beginning, forming a dynamic balance with the air in the upper part of the pressure vessel, and the rest enters the concentrated slurry range extender pump; when the pressure in the pressure vessel exceeds the design value, the air is exhausted through the bursting disc to ensure the safe operation of the pressure vessel.

[0020] 3. The two-way pressure controller of the utility model controls the opening and closing of the solenoid valve according to the set value, which is used to ensure that the pressure vessel works within the designed pressure range and effectively discharges gas, thereby realizing precise exhaust control; the two-way pressure controller has the function of two independent control channels, and can control two different pressure points at the same time, thereby realizing more flexible and efficient pressure control.

[0021] 4. In order to prevent the electrode from malfunctioning, the electrode is not normally energized. The electrode is energized only when the two-way pressure controller detects that the pressure in the pressure vessel reaches a set value; the set value is half of the pressure resistance design value of the pressure vessel during normal filling, that is, to ensure a sufficiently safe pressure range.

[0022] 5. In the utility model, when the low-position electrode detects a potential signal, it means that there is more air in the mortar and a larger space is formed in the container. At this time, the solenoid valve opens to release and exhaust the air in the pressure vessel. When the high-position electrode detects a potential signal, it means that there is very little air in the pressure vessel. At this time, the solenoid valve is controlled to close, and the cycle is carried out to achieve the purpose of clearing the air in the mortar. At the same time, it is ensured that the smooth self-flowing filling will not be affected by the "air blockage" caused by the accumulation of air.

[0023] 6. The exhaust time of each time after the electromagnetic valve of the utility model is opened is 2 to 3 seconds, the purpose of which is to prevent the outflow of mortar when excessive exhaust occurs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of self-flow filling under the prior art;

[0025] Figure 2 This is a schematic diagram of the structure of the online range extension system for high-concentration tailings filling backline extension without pressure relief;

[0026] Figure 3 This is a schematic diagram of the structure of the utility model of the automatic exhaust system for extending the back line of high-concentration tailings filling without pressure relief;

[0027] Figure 4 For this utility model Figure 2 A schematic diagram of the structure of the thick slurry range extender pump combined with the electric lubricating grease pump;

[0028] Figure 5 This is a schematic diagram of the sealing and lubrication structure of the thick slurry range extender pump of the utility model;

[0029] In the figure: 1-filling station, 2-filling pipeline, 2-1 vertical part, 2-2 horizontal part, 3-goaf, 4-pressure vessel, 401-bursting disc, 402-two-way pressure controller, 403-electrode, 404-sealing pipe joint; 5-thick slurry range extender pump, 5-1 slurry inlet reducer, 5-2 slurry outlet reducer; 501-shaft sleeve, 502-first packing pad, 503-rotating shaft lip seal, 504-water seal ring, 505-second packing pad, 506-third packing pad, 507-pressure cover, 508-grease interface, 509-pump shaft; 6-electric lubricating grease pump. DETAILED DESCRIPTION

[0030] The following will be combined with the attached embodiment of the utility model Figure 2-5 , clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] First of all, it is necessary to explain that the special terms of the utility model are explained as follows:

[0032] No pressure relief: before the high-concentration tailings slurry mixed at the filling station reaches the goaf to be filled, the filling pipeline is not opened and the filling slurry is not transferred, that is, the pressure in the pipeline is not leaked to the atmosphere.

[0033] Online: in the same filling line, i.e. filling pipe;

[0034] Back pressure: the pressure of the filling slurry flowing down by gravity due to the height difference;

[0035] Back pressure coefficient: During gravity filling, since the high-concentration tailings slurry flows into the filling pipe by gravity, a large amount of air also enters the filling pipe along with the inflow of mortar. After the mortar rushes into the horizontal pipe, i.e. the horizontal part, on the one hand, due to the friction resistance of the pipe, the flow rate will gradually decrease until the flow stops; at the same time, during horizontal gravity filling, the air originally dispersed in the mortar will gradually gather, and when it gathers to a certain extent, it will form pipe resistance, causing the mortar to stop flowing; at this time, the ratio of the vertical height of the filling pipe (the height of the vertical part of the filling pipe) to the horizontal pipeline length (the horizontal length of the filling pipe) is the back pressure coefficient.

[0036] Online range extender system: In order to expand the filling backline and extend the filling distance, it is necessary to increase the flow power of the high-concentration filling slurry. A special thick slurry range extender pump 5 is added at the end of the pipeline to extend the slurry transportation distance without pressure relief.

[0037] (like Figure 2 (As shown) a high-concentration tailings filling backline extension non-pressure relief automatic exhaust system, including a filling station 1 at a high position and a goaf 3 at a low position, and also includes a filling pipeline 2; the filling pipeline 2 connects the filling station 1 and the goaf 3, and the filling pipeline 2 is composed of a vertical part 2-1 and a horizontal part 2-2.

[0038] The improvement of the utility model lies in that: the starting end of the vertical part 2-1 of the filling pipeline 2 is connected to the filling station 1, and the height of the vertical part 2-1 is H; the end of the horizontal part 2-2 of the filling pipeline 2 is connected to the goaf 3, and the length of the horizontal part 2-2 is L1, and the pressure vessel 4 and the thick slurry extender pump 5 are installed in series first and then at the position of the aforementioned filling pipeline 2 where the back pressure coefficient H:L=1:6, where L1>L.

[0039] First of all, the utility model selects the thick slurry range extender pump 5. The thick slurry range extender pump 5 is also called the thick slurry pump. The thick slurry range extender pump 5 is usually made of special metal materials, so it has high wear resistance and corrosion resistance. The transmission part of the thick slurry range extender pump 5 adopts a rear-pull design, and the bearing seat design improves the bearing lubrication and heat dissipation conditions, thereby improving the stability of the pump. The thick slurry range extender pump 5 usually has high durability and reliability, and can maintain a long life under correct use and maintenance.

[0040] Secondly, in the above embodiments, as a preferred embodiment of the utility model: the pressure vessel 4 has a pressure resistance of 2.0 MPa; the pressure vessel 4 has a diameter of φ700 mm and a height of 2300 mm; the output pressure of the thick slurry range extender pump 5 is 0.4-0.8 MPa; wherein H:L1=1:9-10.

[0041] Therefore, the utility model can increase the back pressure coefficient of gravity filling to 1:9-10, that is, the filling range is expanded by 38.5-53.9%, the application scope of gravity filling is expanded, and multiple filling auxiliary facilities are eliminated; at the end of the original filling pipeline, with minimal equipment added, the filling cost is reduced, the filling speed is increased, the enterprise burden is reduced, and the enterprise benefits are increased.

[0042] (like Figure 3As shown) Not only that, the second core improvement of the utility model is that the pressure vessel 4 has a bursting disc 401, a two-way pressure controller 402, a solenoid valve, and an electrode 403. First of all, it should be noted that the advantage of the utility model in selecting a two-way pressure controller 402 is that the two-way pressure controller 402 is a device for controlling pressure, which has the function of two independent controls. The pressure can be monitored and adjusted to ensure the normal operation of the equipment or system. The two-way pressure controller 402 has two independent control outputs and can control two different pressure points at the same time, thereby achieving more flexible and efficient pressure control. Therefore, the two-way pressure controller 402 can set different pressure thresholds as needed. When the pressure exceeds or falls below the set value, the controller will send a signal or take corresponding measures to adjust the pressure and keep the pressure within an appropriate range, thereby meeting the use requirements of the utility model that require precise pressure control.

[0043] The principle of the height detection of the electrode 403 of the utility model is based on the conductivity of the liquid. In the liquid level electrode, the length and position of the electrode determine the accuracy and range of the measurement; by measuring the resistance between the electrode 403 and the measured medium, the water level of the measured medium liquid can be determined. When the measured medium liquid level is higher than the lower electrode, the liquid will contact the two electrodes to form an electrical conductivity path. At this time, the current can flow between the electrodes, thereby realizing the measurement of the medium liquid level.

[0044] (like Figure 3 As shown in the above embodiment, as the preferred technical solution of the utility model: the bursting disc 401, the two-way pressure controller 402, and the solenoid valve are arranged on the top of the pressure vessel 4; the property that air is easy to gather when it moves upward is utilized; the electrodes 403 are arranged at different heights in the tank body of the pressure vessel 4; the left and right sides of the bottom of the pressure vessel 4 are respectively provided with sealing pipe joints 404 to achieve a sealed connection. The pressure vessel 4 is connected to the outlet end of the filling pipe 2 and the inlet end of the thick slurry range-increasing pump 5 through the sealing pipe joints 404.

[0045] When in use: when the pressure in the pressure vessel 4 exceeds the design value, the bursting disc 401 ruptures to ensure the safe operation of the pressure vessel 4. In addition to being used to display the pressure of the pressure vessel 4 in real time, the two-way pressure controller 402 controls the opening and closing of the solenoid valve according to the set value to ensure that the pressure vessel 4 works within the designed pressure range and effectively discharges gas; the electrode 403 includes a high-position electrode and a low-position electrode arranged at different heights in the tank body of the pressure vessel 4, and the high-position electrode and the low-position electrode are used to detect the mortar height in the pressure vessel 4 and provide a control signal to the solenoid valve. That is, by controlling the solenoid valve, the air in the exhaust pipe is released in real time and accurately.

[0046] In the above-mentioned embodiment, as a further improved embodiment of the utility model: in order to prevent the electrode from malfunctioning, the utility model makes the following improvements: the electrode 403 is not normally energized, and the electrode 403 is energized only when and only when the two-way pressure controller 402 detects that the pressure in the pressure vessel 4 reaches a set value; the set value is half of the pressure resistance design value of the pressure vessel 4 during normal filling, that is, a sufficiently safe pressure range is guaranteed; when the low-level electrode detects a potential signal, it means that there is more air in the mortar and a larger space is formed in the container. At this time, the solenoid valve opens to release and discharge the air in the pressure vessel 4; when the high-level electrode detects a potential signal, it means that there is very little air in the pressure vessel 4. At this time, the solenoid valve is controlled to close, and this cycle is performed to achieve the purpose of clearing the air in the mortar; at the same time, it is ensured that the smooth self-flowing filling will not be affected by the accumulation of air to form "air blockage".

[0047] In the above embodiment, as the preferred technical solution of the utility model: the exhaust time of each time after the electromagnetic valve is opened is 2 to 3 seconds, so as to prevent the mortar from flowing out of the exhaust electromagnetic valve when the exhaust is too much.

[0048] (like Figure 4 On the basis of the above embodiment as shown: the thick slurry range extender pump 5 includes a slurry inlet reducer 5-1 vertically arranged at the top of the pump body and a slurry outlet reducer 5-2 horizontally arranged at the side of the pump body; in addition, the thick slurry range extender pump 5 also includes an electric lubricating grease pump 6; the electric lubricating grease pump 6 and the thick slurry range extender pump 5 are assembled together as a whole.

[0049] It should be noted that it is not a common practice to combine the thick slurry range extender pump 5 and the electric lubricating grease pump 6, because the thick slurry range extender pump 5 and the electric lubricating grease pump 6 are different in structure, function and usage scenarios. The thick slurry range extender pump 5 is mainly used to transport liquids and increase the pressure or flow of liquids, while the electric lubricating grease pump 6 is mainly used in the lubrication system to provide lubricating grease for mechanical equipment. The combination of the two can not only meet the needs of transporting liquids, but also provide lubricating grease, with a compact structure and complete functions.

[0050] During use: the electric lubricating grease pump 6 works first, and the thick slurry range extender pump 5 works later; and every time the thick slurry range extender pump 5 works for a period of time, a certain amount of grease is injected into the thick slurry range extender pump 5 through the electric lubricating grease pump 6 to ensure that the pump body works under the condition of sufficient grease.

[0051] The thick slurry range extender pump 5 also includes a frequency converter and a time control cabinet. The frequency converter is connected to the thick slurry range extender pump 5 and controls the start and stop of the thick slurry range extender pump 5; the time control cabinet is connected to the thick slurry range extender pump 5 and the electric lubricating grease pump 6 and controls the operation time of the thick slurry range extender pump 5 and the electric lubricating grease pump 6. That is, the operation of the thick slurry range extender pump 5 and the electric lubricating grease pump 6 is accurately controlled by the time control cabinet, so as to realize automatic control operation.

[0052] The thick slurry stroke increaser pump 5 has a power auxiliary impeller, a packing seal structure and a pressure reducing cover 507. That is, the stroke increaser effect is ensured and the capital cost is controlled.

[0053] What needs to be explained about the concentrated slurry range extender pump 5 having a powered auxiliary impeller and a packing seal structure is that the concentrated slurry range extender pump 5 generally used for conveying high-concentration tailings slurry has three main sealing forms: mechanical seal, packing seal, powered auxiliary impeller + packing seal.

[0054] Among them, the latter two sealing forms require the addition of water seal water when the pump is running. In this way, a special chamber must be opened in the tunnel, a clean water tank must be installed, a water seal pump must be added, and clean industrial water must be input from the outside. However, these are difficult to achieve in gravity filling.

[0055] Although mechanical seals do not require the addition of sealing water of a certain pressure, since adhesives such as cement are added to the high-concentration tailings mortar used for filling, part of the mortar will adhere to the outside of the working surface of the mechanical seal when it is transported by a pump. If it is not cleaned at any time, it will cause rapid damage to the mechanical seal after solidification. The cost of replacing a mechanical seal is relatively high, ranging from 2,000 to 4,000 yuan per set.

[0056] Therefore, the utility model adopts the lowest cost power auxiliary impeller + packing seal structure. To ensure the sealing effect, the packing seal structure includes a plurality of rotating shaft lip seals 503.

[0057] The advantages of the rotary shaft lip seal 5 adopted in the utility model are as follows: the double-lip design is adopted, and the inner and outer lips are tightly combined to form an effective sealing force, which can prevent leakage and ensure the normal operation of the pump body. It has good adaptability in a wide range of temperature and pressure. Generally, it only needs to be put on the shaft, and no special tools are required, which improves the installation efficiency of the equipment. It can maintain a good sealing effect for a long time, reducing the maintenance and replacement costs of the equipment. There is sufficient supply in the market, and the price is relatively moderate, which can meet the needs of most users. Generally, it only needs to be checked and replaced regularly, and no special maintenance tools and maintenance techniques are required, which reduces the downtime and maintenance costs of the equipment.

[0058] (like Figure 5As shown in the figure, in order to realize pump shaft sealing and lubrication: the pump shaft 509 of the thick slurry range-extending pump 5 is coaxially adapted to be installed with the shaft sleeve 501. The outer side of the shaft sleeve 501 is provided with a first packing pad 502, a rotating shaft lip seal ring 503, a water seal ring 504, a rotating shaft lip seal ring 503, a second packing pad 505, a rotating shaft lip seal ring 503, and a third packing pad 506 in sequence along its axial direction.

[0059] Wherein: the longitudinal sections of the first packing pad 502 and the third packing pad 506 are both right-angle trapezoidal structures, and the first packing pad 502 and the third packing pad 506 are symmetrically arranged in the front and rear directions along the axis. The outer edge of the rotating shaft lip seal 503 is connected to the grease interface 508; the grease interface 508 is inclined, and the grease interface 508 is connected to the electric lubricating grease pump 6. The electric lubricating grease pump 6 provides lubrication for the thick slurry range extender pump 5, so that the packing seal structure of the thick slurry range extender pump 5 and the power auxiliary impeller can be filled with grease, thereby extending the service life of the pump body.

[0060] The utility model relates to an online range-increasing method for extending a high-concentration tailings filling backline without pressure relief.

[0061] The method includes a pressure balance method: when the mortar in the filling pipe 2 flows through the pressure vessel 4, due to the sudden increase in space, the air originally dispersed in the mortar will gather upward in the pressure vessel 4, and under the push of subsequent mortar, a first part of the mortar enters the pressure vessel 4 and forms a dynamic balance with the air originally retained in the upper part of the pressure vessel 4, and the remaining mortar enters the thick slurry extender pump 5.

[0062] The method includes an exhaust method: the two-way pressure controller 402 of the pressure vessel 4 displays the pressure of the pressure vessel 4 in real time, and the two-way pressure controller 402 controls the opening and closing of the solenoid valve according to the set value; the two electrodes 403 of the pressure vessel 4 detect the mortar height in the pressure vessel 4, and the electrodes 403 provide a signal to the solenoid valve, and the air is released and exhausted through the solenoid valve; when the low-position electrode detects a potential signal, the solenoid valve opens to exhaust; when the high-position electrode detects a potential signal, the solenoid valve closes to stop exhausting.

[0063] The method includes a method for preventing the electrode from malfunctioning: the electrode 403 is not normally energized, and the electrode 403 is energized only when and if the two-way pressure controller 402 detects that the pressure in the pressure container 4 reaches a set value; the set value is half of the pressure resistance value of the pressure container 4 during normal filling.

[0064] The method includes a lubrication method: adjusting the program of the electric lubricating grease pump 6 through a frequency converter and a time control cabinet so as to adjust the electric lubricating grease pump 6 to fill the packing sealing structure of the thick slurry range extender pump 5 with grease, and the frequency converter controls the start and stop of the thick slurry range extender pump 5.

[0065] It should be noted that the purpose and effect of the frequency converter controlling the start and stop of the motor of the concentrated slurry extender pump 5 is that since the system of the utility model is arranged at the end of the filling pipe 2, the starting problem of the motor of the concentrated slurry extender pump 5 must be considered at this time. Therefore, the concentrated slurry extender pump 5 must use a frequency converter to control the start and stop of the pump, so as to prevent the occurrence of damage to the transmission line due to excessive starting current when the motor starts, and to prevent the occurrence of problems such as the motor failing to start due to excessive voltage drop.

[0066] The thick slurry range extender pump 5 can be started only after the electric grease pump 6 has worked for a period of time (for example, two time periods or several seconds); every time the thick slurry range extender pump 5 works for a period of time, the electric grease pump 6 pumps a certain amount of grease into the thick slurry range extender pump 5 to fill the packing sealing structure and the power auxiliary impeller with grease.

[0067] The method also includes: when the thick slurry range extender pump 5 transports high-concentration mortar, the mortar is blocked outside the working surface of the packing sealing structure to prevent the mortar from adhering to the working surface of the packing sealing structure; after the filling work is completed, the water used to clean the mortar mixing station and the filling pipeline 2 will simultaneously clean out the mortar in the thick slurry range extender pump 5; at the same time, the thick slurry range extender pump 5 and the electric lubricating grease pump 6 are always in working condition; after the system stops filling, the thick slurry range extender pump 5 is shut down first, and the electric lubricating grease pump 6 continues to work for a period of time (for example, two time periods or several seconds) and then shuts down later than the thick slurry range extender pump 5, that is, it is always fully prepared for the lubrication of the pump body.

[0068] The method also includes a control method of a time control cabinet: after the time control cabinet starts the thick slurry range extender pump 5, the thick slurry range extender pump 5 does not run first, and the thick slurry range extender pump 5 starts to work after the electric lubricating grease pump 6 works for a period of time (for example, two time periods or several seconds); ensure that the packing seal structure is first filled with grease to make full lubrication preparations for the subsequent work of the pump body of the thick slurry range extender pump 5. The time control cabinet controls the electric lubricating grease pump 6 to start working at a certain interval, and this cycle is repeated.

[0069] The working principle of the utility model is as follows: in order to expand the filling backline, extend the filling distance, and increase the flow power of the high-concentration filling slurry, a special thick slurry range extender pump 5 is added at the end of the pipeline to effectively extend the slurry delivery distance without pressure relief. At the same time, a specially designed pressure vessel 4 is added to release and discharge the air in the pipeline in real time and accurately, so that the filling back pressure coefficient after adding the thick slurry range extender pump can reach 1:9~10. When the mortar in the pipeline flows through the pressure vessel 4, the air originally dispersed in the mortar will gather upward in the pressure vessel 4 due to the sudden increase in space after entering the pressure vessel 4, and the mortar, under the push of the subsequent mortar, the first part also enters the pressure vessel 4, and until it forms a dynamic balance with the air on the upper part of the pressure vessel 4, the rest enters the thick slurry range extender pump 5. When the pressure in the pressure vessel 4 exceeds the design value, the bursting disc 401 of the pressure vessel 4 ruptures to ensure the safe operation of the pressure vessel 4. The two-way pressure controller 402 can display the pressure in the pressure vessel 4 in real time and control the opening and closing of the exhaust solenoid valve according to the set value to ensure that the pressure vessel 4 works within the designed pressure range. The height of the mortar in the pressure vessel 4 is detected by two electrodes 403 set at different heights in the pressure vessel 4 to provide a signal to the exhaust solenoid valve; the exhaust solenoid valve is controlled to release the air in the exhaust pipe in real time and accurately, and each exhaust is 2 to 3 seconds to prevent the mortar from flowing out when the exhaust is too much.

[0070] Moreover, through the foregoing description, the advantage of the present invention also lies in: one side of the pressure vessel 4 of the present invention is sealed and connected to the filling pipe 2, and the other side is sealed and connected to the inlet of the concentrated slurry range extender pump 5; when the mortar in the filling pipe 2 flows through the pressure vessel 4, due to the sudden increase of air, the air originally dispersed in the mortar will gather upward in the pressure vessel 4, and under the push of the subsequent mortar, the first part of the mortar also enters the pressure vessel 4, forming a dynamic balance with the air in the upper part of the pressure vessel 4, and the rest enters the concentrated slurry range extender pump 5; when the pressure in the pressure vessel 4 exceeds the design value, the air is exhausted through the bursting disc 401 to ensure the safe operation of the pressure vessel 4.

[0071] The two-way pressure controller 402 of the utility model controls the opening and closing of the solenoid valve according to the set value, so as to ensure that the pressure vessel 4 works within the designed pressure range and effectively discharges gas, thereby realizing precise exhaust control; the two-way pressure controller 402 has the function of two-way independent control, and can control two different pressure points at the same time, thereby realizing more flexible and efficient pressure control.

[0072] In order to prevent the electrode from malfunctioning, the utility model does not normally energize the electrode 403, and energizes the electrode 403 only when the two-way pressure controller 402 detects that the pressure in the pressure vessel 4 reaches a set value; the set value is half of the pressure resistance design value of the pressure vessel 4 during normal filling, that is, to ensure a sufficiently safe pressure range.

[0073] According to the utility model, when the low-position electrode detects a potential signal, it means that there is more air in the mortar and a larger space is formed in the container. At this time, the solenoid valve opens to release and discharge the air in the pressure vessel 4; when the high-position electrode detects a potential signal, it means that there is very little air in the pressure vessel 4. At this time, the solenoid valve is controlled to close, and the cycle is performed to achieve the purpose of clearing the air in the mortar; at the same time, it is ensured that the smooth self-flowing filling will not be affected by the "air blockage" formed by the accumulation of air.

[0074] The exhaust time of each time after the electromagnetic valve of the utility model is opened is 2 to 3 seconds, and the purpose is to prevent the mortar from flowing out when the exhaust is too much.

[0075] In addition, the utility model assembles the electric lubricating grease pump 6 and the thick slurry range extender pump 5 as a whole. The combination of the two can not only meet the demand of conveying liquid, but also provide lubricating grease. It has a compact structure and complete functions, ensuring the long-lasting and stable operation of the thick slurry range extender pump 5.

[0076] The utility model adopts the lowest-cost power auxiliary impeller + packing seal structure, and the packing seal structure includes multiple rotating shaft lip seals 503, which have the advantages of good sealing performance, strong adaptability, easy installation, high reliability, moderate price and convenient maintenance.

[0077] The utility model has the advantages of selecting the thick slurry range-extending pump 5 in that it has excellent wear resistance and corrosion resistance, is stable in use, has durability and reliability, and has a relatively long service life.

[0078] The purpose and effect of the frequency converter of the utility model controlling the start and stop of the motor of the concentrated slurry range extender pump 5 is: since the system of the utility model is arranged at the end of the filling pipe 2, the starting problem of the motor of the concentrated slurry range extender pump 5 must be considered at this time, so the concentrated slurry range extender pump 5 must use a frequency converter to control the start and stop of the pump, so as to prevent the occurrence of damage to the transmission line due to excessive starting current when the motor starts, and to prevent the occurrence of problems such as the motor failing to start due to excessive voltage drop.

[0079] After the electric lubricating grease pump 6 of the utility model has worked for a period of time, for example, two time periods or a number of seconds, the thick slurry range extender pump 5 can be turned on; every time the thick slurry range extender pump 5 has worked for a period of time, the electric lubricating grease pump 6 injects a certain amount of grease into the thick slurry range extender pump 5, so as to fill the packing sealing structure and the power auxiliary impeller with grease, thereby ensuring the stable operation of the pump body and relatively extending the service life of the pump body.

[0080] In summary, the utility model can realize safe, stable and reliable automatic exhaust; more than that, the utility model can increase the back pressure coefficient of gravity filling to 1:9-10, that is, the filling range is expanded by 38.5-53.9%, which greatly expands the application scope of gravity filling and eliminates underground chambers, hydraulic and other filling auxiliary facilities; and at the end of the original filling pipeline, with the least amount of equipment added, the filling cost is reduced, the filling speed is increased, the burden on the enterprise is reduced, and the enterprise benefit is increased.

[0081] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0082] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A high-concentration tailings filling backline extension non-pressure relief automatic exhaust system, comprising a filling station (1) at a high position and a goaf (3) at a low position, and also comprising a filling pipeline (2); the filling pipeline (2) connects the filling station (1) and the goaf (3), and the filling pipeline (2) consists of a vertical part (2-1) and a horizontal part (2-2); Features: The starting end of the vertical portion (2-1) of the filling pipeline (2) is connected to the filling station (1), and the height of the vertical portion (2-1) is H; the end of the horizontal portion (2-2) of the filling pipeline (2) is connected to the goaf (3), and the length of the horizontal portion (2-2) is L1. A pressure vessel (4) and a thick slurry extension pump (5) are installed in series first and then at a position where the back pressure coefficient of the filling pipeline (2) is H:L=1:6, wherein L1>L; The pressure vessel (4) comprises a bursting disc (401), a two-way pressure controller (402), an electromagnetic valve, and an electrode (403); when the pressure in the pressure vessel (4) exceeds a design value, the bursting disc (401) ruptures; in addition to being used to display the pressure of the pressure vessel (4), the two-way pressure controller (402) controls the opening and closing of the electromagnetic valve according to a set value; the electrode (403) comprises a high-position electrode and a low-position electrode arranged at different height positions in the tank body of the pressure vessel (4); the high-position electrode and the low-position electrode are used to detect the height of the mortar in the pressure vessel (4) and provide a control signal to the electromagnetic valve.

2. According to claim 1, the high-concentration tailings filling backline extension non-pressure relief automatic exhaust system is characterized by: The pressure vessel (4) has a pressure resistance of 2.0 MPa; the pressure vessel (4) has a diameter of φ700 mm and a height of 2300 mm; wherein H:L1=1:9-10; and the output pressure of the thick slurry range extender pump (5) is 0.4-0.8 MPa.

3. According to claim 1, the high-concentration tailings filling backline extension non-pressure relief automatic exhaust system is characterized by: The electrode (403) is not normally energized, and is energized only when and if the two-way pressure controller (402) detects that the pressure in the pressure container (4) reaches a set value; the set value is half of the pressure resistance design value of the pressure container (4) during normal filling; when the low-position electrode detects a potential signal, the solenoid valve opens; when the high-position electrode detects a potential signal, the solenoid valve closes.

4. According to claim 1, the high-concentration tailings filling backline extension non-pressure relief automatic exhaust system is characterized by: The bursting disc (401), the two-way pressure controller (402), and the solenoid valve are arranged on the top of the pressure vessel (4); the electrodes (403) are arranged at different heights in the tank body of the pressure vessel (4); and the left and right sides of the bottom end of the pressure vessel (4) are respectively provided with sealing pipe joints (404), and the pressure vessel (4) is respectively connected to the outlet end of the filling pipe (2) and the inlet end of the thick slurry range-increasing pump (5) through the sealing pipe joints (404).

5. The high-concentration tailings filling backline extension non-pressure relief automatic exhaust system according to claim 1, 3 or 4, characterized in that: The exhaust time for each time after the solenoid valve is opened is 2 to 3 seconds.

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