Segmented pressure relief conveying system for underground large-height-difference filling

Abstract

The utility model belongs to the technical field of underground mining, and particularly discloses a segmented pressure relief conveying system for underground large-height-difference filling. A filling preparation station of the conveying system is arranged on the ground surface or the upper portion of a mine. A self-flowing type filling pipe obliquely extends underground, and the top end of the self-flowing type filling pipe communicates with a discharging port of the filling preparation station. The buffer pressure relief barrel is connected with the self-flowing filling pipe in series or in parallel, a feeding pipe of the buffer pressure relief barrel is fixed at the top end or the upper part of the barrel body, an inlet end is communicated with the self-flowing filling pipe, a discharging pipe is fixed at the bottom end of the conical barrel, and an outlet end is communicated with the self-flowing filling pipe. According to the utility model, the buffer pressure relief barrels are connected in series or in parallel on the self-flowing type filling pipe, so that the pressure of tailing slurry acting on the filling pipe can be obviously reduced, and the flow and flow velocity of the tailing slurry can be stabilized, thereby reducing the abrasion of the inner wall of the pipeline to prolong the service life, weakening and even avoiding the vibration of the pipeline, and improving the production efficiency. Production cost and safety risks of a filling process are effectively reduced, and the pressure relief device has the advantages of simple structure, remarkable pressure relief effect, low cost, safety and reliability.

Description

Technical Field

[0001] This utility model belongs to the field of underground mining technology, specifically relating to a segmented pressure relief and conveying system for underground filling with large elevation differences. It is simple in structure, has a significant pressure relief effect, low cost, and is safe and reliable. Background Technology

[0002] Mine backfilling generally refers to the process of preparing qualified backfill slurry on the surface and transporting it underground through pipelines to fill mined-out areas. It is a crucial measure to prevent surface subsidence, control mine pressure, reduce gas leakage, and improve mine stability. Depending on the power source for backfilling, the pipeline transportation method for backfill slurry can be divided into two types: gravity flow and pumping. Gravity flow backfill slurry transportation is widely used in mine backfilling because it does not consume additional energy, is low-cost, and simple to maintain.

[0003] As underground mining extends deeper, the filling pipelines used to transport slurry in the goaf become longer and the elevation differences become greater, causing a sharp increase in the fluid pressure and velocity at the end of the gravity-flow filling pipe. For example... Figure 1 The mine shown has a filling pipeline that mostly descends steep slopes via inclined shafts. From the surface filling preparation station to the junction of the B104 line at the 60 filling level in the western mining section, the length of the gravity-flow continuous pipeline at the second preparation station is approximately 3363 meters, with an elevation difference of 782 meters (842-60), and the pressure at the end of the pipeline is approximately 14.1 MPa. The length of the gravity-flow continuous pipeline at the first preparation station is approximately 2919 meters, with an elevation difference of 873 meters (933-60), and the pressure at the end of the pipeline is approximately 15.7 MPa. As a result, not only does the slurry cause a sharp increase in the abrasion of the inner wall of the filling pipe and the control valve, severely affecting the service life of the filling pipe and the control valve, but the maintenance workload is also increased due to the greater difficulty of maintenance in the inclined shaft. Moreover, with the increase in flow velocity, phenomena such as liquid cavitation, negative pressure, voids and cavitation occur in the filling pipe, which will further accelerate the abrasion of the filling pipe. It will also cause problems such as vacuum sealing water hammer and strong pipeline vibration, leading to the risk of frequent leakage of filling slurry due to easy wear and rupture of the pipeline, endangering the safety and stability of the entire filling and transportation system, and also increasing the production cost of the filling process.

[0004] Therefore, reducing the pressure of the slurry transported within the filling pipe is key to solving the existing problems of mine filling pipelines. To this end, existing technologies include installing pressure-reducing valves at intervals on the filling pipe to alleviate the excessively high pressure of the slurry transported within the pipe. While these solutions are simple in structure and have low installation costs, the presence of a large amount of gravel and sand in the slurry leads to rapid wear of the pressure-reducing valves, increasing maintenance workload and replacement costs. Furthermore, the failure of a single pressure-reducing valve can easily cause the entire filling and conveying system to shut down, severely impacting filling efficiency. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a segmented pressure relief and delivery system for downhole filling with large elevation differences. This system is simple in structure, has a significant pressure relief effect, is low in cost, and is safe and reliable.

[0006] This utility model is implemented as follows: it includes a filling preparation station and a self-flowing filling pipe. The filling preparation station is set on the ground surface or above the mine, and the self-flowing filling pipe extends inclinedly downward into the mine and its top end is connected to the discharge port of the filling preparation station.

[0007] It also includes at least one buffer pressure relief tank installed underground. The buffer pressure relief tank is connected in series or in parallel with the gravity filling pipe. The buffer pressure relief tank includes a cylinder, a cone connected to the lower end of the cylinder, a feed pipe, and a discharge pipe. The feed pipe is fixedly installed at the top or upper part of the cylinder and its inlet end is connected to the gravity filling pipe. The discharge pipe is fixedly connected to the bottom end of the cone and its outlet end is connected to the gravity filling pipe.

[0008] Furthermore, a base is provided below the buffer pressure relief tank, and a support frame is vertically provided on the base. The support frame is fixedly connected to the base through anchor piles penetrating the base. The cylinder is fixedly provided at the top of the support frame, and the cone is suspended downwards inside the support frame.

[0009] Furthermore, an overflow pipe is fixedly installed on the side wall of the cylinder near the top, and an exhaust pipe extending vertically upward is connected to the discharge pipe, with the exhaust port facing the top of the cylinder.

[0010] Furthermore, a tailings discharge pool is provided below one side of the buffer pressure relief tank, and the lower end of the overflow pipe extends into the tailings discharge pool.

[0011] Furthermore, a filter screen is provided at the bottom end of the cylinder, and a slag removal port is provided on the bottom side wall of the cylinder.

[0012] Furthermore, the buffer pressure relief tank is connected in parallel with the gravity filling pipe, and valve I is connected in series between the gravity filling pipe and the connection port of the feed pipe and the discharge pipe, and valve II is connected in series on the feed pipe.

[0013] Furthermore, the connection section between the feed pipe and the gravity-flow filling pipe is inclined upwards and connected to the gravity-flow filling pipe, while the connection section between the discharge pipe and the gravity-flow filling pipe is inclined downwards and connected to the gravity-flow filling pipe; or an inverted "Y"-shaped tee is provided at the connection between the feed pipe and the gravity-flow filling pipe, with the top of the "Y"-shaped tee connected to the previous gravity-flow filling pipe, and the lower two ends of the "Y"-shaped tee connected to the feed pipe and the next gravity-flow filling pipe, respectively.

[0014] Furthermore, valve I and valve II are electric valves, and a level switch is fixedly installed on the side wall of the cylinder at the upper part of the overflow pipe. Valve I, valve II and the level switch are electrically connected to the controller.

[0015] Furthermore, flow meters are respectively installed on the feed pipe and the discharge pipe, and a concentration meter is also installed on the discharge pipe. The flow meters and the concentration meter are electrically connected to the controller.

[0016] The beneficial effects of this utility model are:

[0017] 1. This utility model forms segmented conveying by connecting buffer pressure relief tanks in series or parallel on the self-flowing filling pipe. This not only reduces the height difference of each segment of the self-flowing filling pipe to reduce the pressure and velocity of the slurry, but also allows the tailings slurry in the self-flowing filling pipe to have a short-term residence time. This can significantly reduce the pressure of the tailings slurry in the next segment of the self-flowing filling pipe and stabilize the flow rate and velocity of the tailings slurry. This can reduce the wear of the inner wall of the pipe to improve its service life, and also reduce cavitation, negative pressure, voids and cavitation phenomena in the liquid flow in the filling pipe. It can effectively reduce or even avoid pipeline vibration and effectively reduce the production cost and safety risks of the filling process.

[0018] 2. This utility model uses a buffer pressure relief tank to segment the slurry delivery through a gravity-flow filling pipe with a large elevation difference. The pressure-reducing valve, due to its lack of complex operating mechanisms, significantly reduces the failure rate when delivering slurry containing large amounts of gravel and sand, thereby reducing maintenance workload and replacement costs. In particular, by setting the buffer pressure relief tank and the gravity-flow filling pipe side-by-side and installing valves on each, the slurry can be directly fed into the gravity-flow filling pipe in case of a buffer pressure relief tank failure. This avoids shutting down the entire filling and conveying system, improves filling efficiency, and facilitates the maintenance of the buffer pressure relief tank.

[0019] In summary, this utility model has the characteristics of simple structure, significant pressure relief effect, low cost, and safety and reliability. Attached Figure Description

[0020] Figure 1 Schematic diagram of the existing goaf filling and conveying slurry pipeline;

[0021] Figure 2 This is a schematic diagram of the structure of this utility model;

[0022] Figure 3 This is one of the schematic diagrams of the buffer pressure relief tank structure of this utility model;

[0023] Figure 4 This is the second schematic diagram of the buffer pressure relief tank structure of this utility model;

[0024] In the diagram: 1-filling preparation station, 2-self-flowing filling pipe, 3-buffer pressure relief tank, 31-cylinder body, 32-cone, 33-feed pipe, 34-discharge pipe, 35-support frame, 36-overflow pipe, 37-vent pipe, 38-valve II, 39-flow meter, 3A-concentration meter, 4-base, 5-anchor pile, 6-tailings discharge pool, 7-valve I. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this does not limit the present invention in any way. Any changes or improvements made based on the teachings of the present invention shall fall within the protection scope of the present invention.

[0026] like Figure 2 , 3 As shown in Figure 4, this utility model includes a filling preparation station 1 and a gravity-flow filling pipe 2. The filling preparation station 1 is located on the surface or above the mine, and the gravity-flow filling pipe 2 extends inclinedly downward into the mine and its top end is connected to the discharge port of the filling preparation station 1.

[0027] It also includes at least one buffer pressure relief tank 3 installed underground. The buffer pressure relief tank 3 is connected in series or in parallel with the gravity filling pipe 2. The buffer pressure relief tank 3 includes a cylinder 31, a cone 32 connected to the lower end of the cylinder 31, a feed pipe 33, and a discharge pipe 34. The feed pipe 33 is fixedly installed at the top or upper part of the cylinder 31 and its inlet end is connected to the gravity filling pipe 2. The discharge pipe 34 is fixedly connected to the bottom end of the cone 32 and its outlet end is connected to the gravity filling pipe 2.

[0028] A base 4 is provided below the buffer pressure relief tank 3, and a support frame 35 is vertically provided on the base 4. The support frame 35 is fixedly connected to the base 4 by an anchor pile 5 that passes through the base 4. The cylinder 31 is fixedly provided at the top of the support frame 35, and the cone 32 is suspended downward inside the support frame 35.

[0029] An overflow pipe 36 is fixedly installed on the side wall of the cylinder 31 near the top, and an exhaust pipe 37 extending vertically upward is connected to the discharge pipe 34, with the exhaust port of the exhaust pipe 37 facing the top of the cylinder 31.

[0030] A tailings discharge pool 6 is provided below one side of the buffer pressure relief tank 3, and the lower end of the overflow pipe 36 extends into the tailings discharge pool 6.

[0031] A filter screen is provided at the bottom end of the cylinder 31, and a slag removal port is provided on the bottom side wall of the cylinder 31.

[0032] The buffer pressure relief tank 3 is connected in parallel with the gravity filling pipe 2. The gravity filling pipe 2 is connected in series with valve I 7 between the connection port of the feed pipe 33 and the discharge pipe 34. The feed pipe 33 is connected in series with valve II 38.

[0033] The feed pipe 33 is connected to the gravity-flow filling pipe 2 at an upward angle, and the discharge pipe 34 is connected to the gravity-flow filling pipe 2 at a downward angle; or an inverted "Y"-shaped tee is provided at the connection between the feed pipe 33 and the gravity-flow filling pipe 2, the top of the "Y"-shaped tee is connected to the upper-level gravity-flow filling pipe 2, and the lower two ends of the "Y"-shaped tee are connected to the feed pipe 33 and the lower-level gravity-flow filling pipe 2, respectively.

[0034] Valve I7 and valve II38 are electric valves. A level switch is fixedly installed on the side wall of the cylinder 31 above the overflow pipe 36. Valve I7, valve II38 and the level switch are electrically connected to the controller.

[0035] The controller is a common relay control circuit or PLC controller.

[0036] A flow meter 39 is installed on the feed pipe 33 and the discharge pipe 34 respectively. A concentration meter 3A is also installed on the discharge pipe 34. The flow meter 39 and the concentration meter 3A are electrically connected to the controller respectively.

[0037] The working principle and process of this utility model:

[0038] like Figure 2 As shown, according to Figure 1 The pipeline design and installation route includes an emergency tailings discharge pond 6 within the B106 pipeline filling and connecting channel at level 460. A buffer pressure relief tank 3 is installed to allow for a brief residence of the slurry, achieving segmented reduction of flow velocity and pressure relief, while also preventing overflow caused by pipe blockage at the bottom of the buffer pressure relief tank 3. An installation space with a height of 6 meters and a perimeter width of approximately 8.7–11.5 meters is developed at the selected location within the buffer pressure relief tank 3. The buffer pressure relief tank 3 has a total height of 3.5 meters, a cylindrical body 31 with a height of 2 meters and a diameter of 2.5 meters, and a conical bottom 32 with a height of 1.5 meters and a cone angle of 50 degrees. Within the installation space, the process involves: excavating the foundation of base 4 → constructing anchor pile holes and installing anchor piles 5 on the bedrock (the support frame 35 has 4 base plates at its bottom, each base plate containing 4 grouting anchor piles 5) → pouring concrete base 4 → welding support frame 35 onto concrete base 4 → constructing 4 hoisting hooks at appropriate positions at the top of the installation space above support frame 35 → hoisting the buffer pressure relief tank 3; (e.g.) Figure 3 and 4As shown, finally install the tailings slurry inlet pipe 33, outlet pipe 34, overflow pipe 36 and exhaust pipe 37 of the overlapping buffer pressure relief tank 3, and install valve II 38 and valve I 7 on the inlet pipe 33 and the parallel gravity filling pipe 2 respectively. Connect the inlet pipe 33 and outlet pipe 34 to the parallel gravity filling pipe 2 to complete the installation of the segmented pressure relief conveying system.

[0039] During filling, the filling preparation station 1 is started to input slurry into the gravity-flow filling pipe 2. Under the action of gravity, the slurry flows downward along the inclined gravity-flow filling pipe 2, gradually increasing the flow velocity and the pressure on the side wall of the gravity-flow filling pipe 2. When it reaches the buffer pressure relief tank 3 in the measure tunnel of the B106 pipeline at level 460, the pipeline length of the second preparation station is 2362 meters, the elevation difference is 382 meters (842-460), and the end pressure is about 6.88 MPa; the pipeline length of the first preparation station is about 1918 meters, the elevation difference is 473 meters (933-460), and the end pressure is about 8.5 MPa; from the buffer pressure relief tank 3 to the B104 line branch at level 60, the pipeline length is about 1061 meters, the elevation difference is 400 meters (460-60), and the end pressure is about 7.2 MPa. It can be seen that after the segmented pressure relief by the buffer pressure relief tank 3, the pressure of the filling slurry transported along the entire filling pipeline is reduced by a factor of two, with a significant effect. During the filling process, the controller receives a signal from the level switch. When the liquid level in the cylinder 31 is normal, it controls valve I7 to close and valve II 38 to open, allowing the slurry to briefly stay in the buffer pressure relief tank 3 to relieve pressure, and then continue to flow downward through the lower gravity filling pipe 2. When the controller receives a trigger signal from the level switch, it indicates that the liquid level in the cylinder 31 has exceeded the overflow pipe 36. It controls valve I7 to open and valve II 38 to close, allowing the slurry to flow directly downward through the gravity filling pipe 2. At this time, abnormal factors in the buffer pressure relief tank 3 can be eliminated.

[0040] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A segmented pressure relief conveying system for filling large height difference underground, comprising a filling preparation station (1) arranged on the ground surface or upper part of a mine, and a self-flowing filling pipe (2) extending obliquely downward and having a top end communicating with a discharge port of the filling preparation station (1); further comprising at least one buffer pressure relief barrel (3) arranged underground, which is connected in series or parallel with the self-flowing filling pipe (2), the buffer pressure relief barrel (3) comprising a barrel body (31), a tapered cylinder (32) connected to a lower end of the barrel body (31), a feeding pipe (33) fixedly arranged at a top end or upper part of the barrel body (31) and having an inlet end communicating with the self-flowing filling pipe (2), and a discharge pipe (34) fixedly connected to a bottom end of the tapered cylinder (32) and having an outlet end communicating with the self-flowing filling pipe (2). characterized in that A base (4) is arranged below the buffer pressure relief barrel (3), a support frame (35) is vertically arranged on the base (4), the support frame (35) is fixedly connected with the base (4) through an anchor pile (5) penetrating the base (4), the barrel body (31) is fixedly arranged at a top end of the support frame (35), and the tapered cylinder (32) is arranged in the support frame (35) in a downwardly suspended manner.

2. The segmented pressure relief delivery system for high relief filling downhole of claim 1, wherein: An overflow pipe (36) is fixedly arranged on a side wall of the barrel body (31) near the top end, the discharge pipe (34) is provided with a vertically upwardly extending exhaust pipe (37) communicating therewith, and an exhaust port of the exhaust pipe (37) faces the top end of the barrel body (31).

3. The segmented pressure-relief delivery system for high-relief filling downhole of claim 1 or 2, wherein: A tailings discharge pool (6) is arranged below one side of the buffer pressure relief barrel (3), and a lower end of the overflow pipe (36) extends into the tailings discharge pool (6).

4. The segmented pressure relief delivery system for high relief filling downhole of claim 3, wherein: A filter screen is arranged at a bottom end of the barrel body (31), and a slag removal opening is formed in a side wall of a bottom part of the barrel body (31).

5. The segmented pressure relief delivery system for high relief filling downhole of claim 3, wherein: The buffer pressure relief barrel (3) is connected in parallel with the self-flowing filling pipe (2), a valve I (7) is connected in series between the self-flowing filling pipe (2) and a connecting port of the feeding pipe (33) and the discharge pipe (34), and a valve II (38) is connected in series on the feeding pipe (33).

6. The segmented pressure relief delivery system for high relief filling downhole of claim 3, wherein: A connecting section of the feeding pipe (33) and the self-flowing filling pipe (2) is connected with the self-flowing filling pipe (2) in an upwardly inclined manner, a connecting section of the discharge pipe (34) and the self-flowing filling pipe (2) is connected with the self-flowing filling pipe (2) in a downwardly inclined manner, or an inverted "Y" shaped tee pipe is arranged at a connecting position of the feeding pipe (33) and the self-flowing filling pipe (2), a top end of the "Y" shaped tee pipe communicates with an upper self-flowing filling pipe (2), and lower ends of a lower part of the "Y" shaped tee pipe respectively communicate with the feeding pipe (33) and a lower self-flowing filling pipe (2).

7. The segmented pressure-relief delivery system for high-relief filling downhole of claim 6, wherein: The valve I (7) and the valve II (38) are electric valves, a liquid level switch is fixedly arranged on a side wall of the barrel body (31) at an upper part of the overflow pipe (36), and the valve I (7), the valve II (38) and the liquid level switch are electrically connected with a controller, respectively.

8. The segmented pressure relief delivery system for high relief filling downhole of claim 6, wherein: ​ 9. The segmented pressure relief delivery system for high relief filling downhole of claim 8, wherein: The feed pipe (33) and the discharge pipe (34) are respectively provided with a flow meter (39), and the discharge pipe (34) is further provided with a concentration meter (3A), and the flow meter (39) and the concentration meter (3A) are respectively electrically connected with the controller.

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