Open pit coal mine sampling drill hole plugging device

Abstract

The utility model discloses an opencast coal mine sampling drill hole plugging device which comprises a supporting rod piece of a hollow structure, one end of the supporting rod piece is connected with a medium source, the other end of the supporting rod piece is closed, and at least one through hole communicated with the hollow structure is formed in the peripheral side of the supporting rod piece. The first protection frame body and the second protection frame body are axially connected with the supporting rod piece in a spaced mode, the distance between the outline of the first protection frame body and the axis and the distance between the outline of the second protection frame body and the axis are smaller than the diameter of a drill hole, and therefore the first protection frame body and the second protection frame body can move in the drill hole; the expansion bag body is arranged on the supporting rod piece in a sleeving manner and is connected between the first protection frame body and the second protection frame body; the interior of the expansion bag communicates with the through hole. The sealing device is simple and compact in structure, the sealing position is adjusted according to the depth of a drill hole, the expansion bag body is effectively limited in the axial direction, the expansion bag body is expanded in the radial direction, the drill hole blocking effect is improved, spontaneous combustion of a coal seam in the drill hole is prevented, and the problems of high cost and serious pollution are solved.

Description

Technical Field

[0001] The utility model relates to the field of borehole plugging, in particular to an open-pit coal mine sampling borehole plugging device. Background Art

[0002] Open-pit coal mines refer to coal seams deposited on the surface or shallow layers due to geographical changes. They have the advantages of low mining cost, high output, high recovery rate, production safety, and good working conditions. They are one of the coal production methods in my country. However, open-pit coal mines also have some problems, such as environmental pollution and land destruction. Among them, one of the most serious problems is spontaneous combustion of coal seams.

[0003] Spontaneous combustion of coal seams refers to the phenomenon that under certain conditions, coal seams undergo oxidation reactions with air, generating a large amount of heat, causing the temperature of the coal seams to rise, reaching or exceeding their own auto-ignition point, thus causing their own spontaneous combustion. Spontaneous combustion of coal seams poses safety hazards such as fire and explosion, causing huge economic losses and safety accidents. Therefore, it is particularly important to prevent and control spontaneous combustion of coal seams in open-pit coal mines;

[0004] At present, for sampling drilling in open-pit coal mines, two methods are usually used: hole cleaning and grouting. Hole cleaning refers to the use of water or other liquids to clean the mud in the borehole after the drilling is completed, and then the borehole is sealed with a plastic bag or other material; grouting refers to the use of cement or other materials to fill the voids in the borehole tightly after the drilling is completed. Although these two methods can prevent air from entering the borehole to a certain extent and prevent spontaneous combustion of coal seams, they also have some disadvantages and shortcomings. For example, hole cleaning requires the consumption of a large amount of water or other liquids, which increases costs and pollution; grouting requires the consumption of a large amount of cement or other materials, which increases costs and solid waste;

[0005] Coal seam sampling drilling can usually reach tens of meters, while open-pit coal mining is layered mining. At present, the borehole plugging device can only seal the end of the borehole, so it is easy to expose the coal seam below the borehole during mining, increasing the wind direction of coal seam spontaneous combustion. Therefore, it is necessary to develop a new type of plugging device for open-pit coal mine sampling drilling to improve the plugging effect and prevention effect, and reduce costs and pollution. Summary of the invention

[0006] The utility model aims to provide an open-pit coal mine sampling borehole sealing device with a simple and compact structure. The sealing position is adjusted according to the borehole depth, and the expansion bladder is effectively limited axially to expand radially, thereby improving the borehole blocking effect, preventing the coal seam in the borehole from spontaneous combustion, and avoiding the problems of high cost and large pollution.

[0007] In order to achieve the above purpose, the present open-pit coal mine sampling borehole plugging device is pushed into the borehole, and comprises:

[0008] The support rod is a hollow structure, one end of which is connected to the medium source, the other end is closed, and the peripheral side is provided with at least one through hole connected to the hollow structure;

[0009] The first protection frame and the second protection frame are connected to the support rod at an axial interval, and the distance between the outer contour of the first protection frame and the second protection frame and the axis is smaller than the diameter of the drilled hole, so that the first protection frame and the second protection frame can move in the drilled hole;

[0010] The expansion bladder is sleeved on the supporting rod and connected between the first protection frame and the second protection frame; the interior of the expansion bladder is communicated with the through hole.

[0011] In some examples of the present invention, the first protection frame is close to the drilling hole, and includes:

[0012] Multiple support frames are evenly arranged around the circumference, each support frame is connected to the expansion bladder and is rotatably mounted on the support rod inside;

[0013] A support body, connected to a plurality of support frames, connected to the support rods on the inner side, and having a circumference larger than the outer contour of the support frames;

[0014] Wherein, under the effect of the volume change of the expansion bladder, the outer end of the support frame can drive the support body to expand or contract in the direction away from or close to the expansion bladder.

[0015] Furthermore, the support frame is provided with a slot along its length direction;

[0016] A connecting block movably connected to the sliding member is fixed on the expansion bladder;

[0017] Wherein, the sliding member is slidably connected to the slot body.

[0018] Furthermore, a ball joint is adopted between the sliding member and the connecting block.

[0019] Furthermore, the inner side of the support frame has a bending section, and is connected to the support rod through an ear seat;

[0020] When the support frame is unfolded to a certain angle, the bending section contacts the ear seat to limit the angle.

[0021] In some examples of the present invention, the second protection frame includes a middle sleeve and at least one pair of support rods;

[0022] The sleeve is slidably mounted on the supporting rod and fixed by a locking rod;

[0023] At least one pair of supporting rods are evenly connected to the circumference of the sleeve and extend outwards.

[0024] In some examples of the present invention, the medium in the medium source is a phase change material.

[0025] In some examples of the present invention, the support rod is provided with a connection nozzle at one end facing the drilling hole;

[0026] The pipe fitting that pushes the plugging device into the drilled hole is connected to the connecting nozzle for medium input or output.

[0027] In some examples of the present invention, a pressure sensor is provided on the pipe, and a pump body is provided on the medium source;

[0028] The controller receives the signal from the pressure sensor and controls the opening and closing of the pump body.

[0029] In some examples of the present invention, the blocking device is multiple;

[0030] Multiple plugging devices are arranged in layers along the depth of the borehole.

[0031] Compared with the prior art, the present open-pit coal mine sampling borehole plugging device has an expansion sac disposed between the first protection frame and the second protection frame, and the interior of the expansion sac is connected to the through hole of the support rod. Therefore, the plugging device can reasonably adjust the closed position according to the depth of the borehole, and effectively limit the expansion range of the expansion sac through the first protection frame and the second protection frame, so that it can expand radially, thereby improving the plugging effect of the borehole, preventing the coal seam in the borehole from spontaneous combustion, and avoiding the high cost and large pollution problems of traditional hole cleaning or grouting.

[0032] Since the first protection frame includes a support body and a plurality of support frames, when the expansion bladder is filled with a medium, the volume of the expansion bladder increases and squeezes the support frame, so that the support frame drives the support body to expand, forming an open "umbrella" shape. At this time, not only the surrounding side of the support body can initially block the inner wall of the borehole, but also the support body can block the borehole after expansion, effectively protecting the expansion bladder; in addition, the connecting block on the expansion bladder is movably connected with the sliding member, and when the expansion bladder seals the borehole well, it is convenient for the expansion bladder to adaptively drive the sliding member to slide when deforming, so that the support frame is linked to expand, avoiding the situation where uneven force will occur at the connection between the expansion bladder and the support frame;

[0033] Since the medium in the medium source is made of phase change material, when a large amount of heat accumulates inside the coal seam, under the influence of a certain temperature, the phase change material in the expansion bladder absorbs heat and changes, thereby appropriately reducing the temperature of the coal seam and effectively regulating the ground temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a front view of the expansion bladder in the utility model in an expanded state;

[0035] Figure 2 This is a front view of the expansion bladder in the utility model in a contracted state;

[0036] Figure 3 It is a schematic diagram of the support frame of the utility model in the unfolded state;

[0037] Figure 4 This is a front view of the first protection frame and the second protection frame in the utility model, both of which are "umbrella-shaped" structures;

[0038] Figure 5 It is a schematic diagram of the support frame of the utility model in the unfolded state (the support body is not drawn);

[0039] Figure 6 It is a schematic diagram of the supporting skeleton structure in the utility model;

[0040] In the figure: 100, blocking device;

[0041] 10. support rod, 11. through hole;

[0042] 20. first protection frame, 21. support frame, 22. support body, 23. ear seat 23, 24. sliding member, 25. slot body, 26. support shaft, 27. bending section;

[0043] 30. expansion bladder, 31. connection block;

[0044] 40. A second protective frame;

[0045] 51. Connect the mouth. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the technical solution of the utility model clearer, the technical solution of the embodiment of the utility model will be clearly and completely described in combination with the drawings of the specific embodiments of the utility model. The same figure marks in the drawings represent the same parts. It should be noted that the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the described 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.

[0047] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by persons with ordinary skills in the field to which the utility model belongs. The words "first", "second" and similar words used in the specification and claims of the utility model patent application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not necessarily indicate quantity restrictions. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0048] As explained, the part close to the axis of the support rod 10 is the inner side, and the part away from the axis of the support rod 10 is the outer side. The axis and axial direction are based on the center of the support rod body.

[0049] like Figure 1 , Figure 2 As shown, the plugging device for sampling boreholes in open-pit coal mines, the plugging device 100 is pushed into the borehole, and comprises:

[0050] The support rod 10 is a hollow structure, one end of which is connected to the medium source, the other end is closed, and the peripheral side is provided with at least one through hole 11 connected to the hollow structure;

[0051] The first protection frame 20 and the second protection frame 40 are connected to the support rod 10 at axial intervals, and the outer contours of the first protection frame 20 and the second protection frame 40 are smaller than the diameter of the drilled hole so that they can move in the drilled hole;

[0052] The expansion bladder 30 is sleeved on the support rod 10 and connected between the first protection frame 20 and the second protection frame 40; the interior of the expansion bladder 30 is communicated with the through hole 11;

[0053] Specifically, the support rod 10 is used to transport the medium and support the expansion bladder 30, the first protection frame 20, and the second frame. The support rod 10 has a plurality of through holes 11 for passing the medium into the expansion bladder 30. Preferably, the plurality of through holes 11 are first evenly arranged in the circumferential direction of the support rod 10 and then spaced in the axial direction of the support rod 10.

[0054] The first protection frame 20 and the second protection frame 40 are installed on both sides of the support rod 10. On the one hand, they can be used to limit the expansion range of the expansion bladder 30, especially in the axial direction, and on the other hand, they are used to protect the expansion bladder 30 to avoid damage during coal mining; the distance between the outer contour of the first protection frame 20 and the second protection frame 40 and the axis of the support rod 10 is less than the diameter of the borehole, so as to ensure that the plugging device 100 can be smoothly moved in the borehole, that is, put in and removed;

[0055] The expansion bladder 30 is made of high-strength elastic material and can withstand a certain internal pressure. The expansion bladder 30 is connected to the through hole 11 for passing a medium; the medium can be gas or liquid, such as high-pressure gas or water;

[0056] When the open-pit coal mine sampling borehole plugging device is used, a borehole is firstly drilled in the open-pit coal mine to obtain a core. After the core is obtained, the plugging device 100 which is not filled with a medium is placed in the borehole, and the hole opening can be sealed. Figure 2 As shown, at this time, the expansion bladder 30 is in a contracted state;

[0057] When the plugging device 100 is lowered to a suitable position, the medium is filled into the expansion bladder 30, that is, the medium enters the hollow structure of the support rod 10 from the medium source, and then enters the expansion bladder 30 from the through hole 11. As the medium is filled, the volume of the expansion bladder 30 gradually increases. Figure 1 As shown, until it fits tightly with the borehole wall, it plays the role of supporting and sealing the borehole and preventing the coal seam in the borehole from spontaneous combustion;

[0058] After mining, the plugging device 100 can be recovered and reused by relieving the pressure on the expansion bag.

[0059] Therefore, the plugging device 100 can reasonably adjust the closing position according to the drilling depth, and effectively limit the expansion bladder 30 through the first protective frame 20 and the second protective frame 40 to make it expand radially, thereby improving the plugging effect of the borehole, preventing the coal seam in the borehole from spontaneous combustion, and avoiding the high cost and pollution problems of traditional hole cleaning or grouting.

[0060] In some examples of the present invention, Figure 3 , Figure 4 , Figure 5 As shown, the first protection frame 20 is close to the drilling hole and includes:

[0061] A plurality of support frames 21 are evenly arranged around the circumference, each support frame 21 is connected to the expansion bladder 30 and is rotatably mounted on the support rod 10;

[0062] The support body 22 is connected to the plurality of support frames 21, connected to the support rods 10 on the inner side, and larger than the outer contour of the support frames 21 on the circumference side;

[0063] Wherein, under the effect of the volume change of the expansion bladder 30, the outer end of the support frame 21 can drive the support body 22 to expand or contract in the direction away from or close to the expansion bladder 30;

[0064] Specifically, the support frame 21 is made of hard material, and its length is determined according to the drilling diameter.

[0065] The support frame 21 is connected to the expansion bladder 30, so that when the volume of the expansion bladder 30 changes, it can drive the support frame 21 in a linked manner, so that the support frame 21 performs corresponding actions; the inner side of the support frame 21 rotates on the support rod 10 to ensure that the support frame 21 can be expanded or contracted, and the outer side faces the expansion bladder 30, thus forming an "umbrella" structure;

[0066] The support body 22 is foldable or has a certain elastic material to ensure that the drilled holes can be closed or folded and gathered accordingly when the support frame 21 is expanded or contracted;

[0067] In this example, when the expansion bladder 30 is not filled with a medium, the support frame 21 and the support body 22 are in a contracted state. When the expansion bladder 30 is filled with a medium, the volume of the expansion bladder 30 increases and squeezes the support frame 21, so that the support frame 21 drives the support body 22 to unfold, forming an open "umbrella" shape. At this time, not only can the surrounding side of the support body 22 preliminarily block the inner wall of the borehole, but the support body 22 can also block the borehole after unfolding, effectively protecting the expansion bladder 30 and preventing the expansion bladder 30 from being damaged by excessive pressure due to falling rocks or the like.

[0068] Further, such as Figure 6 As shown, the support frame 21 is provided with a slot 25 along its length direction;

[0069] A connection block 31 movably connected to the sliding member 24 is fixed on the expansion bladder 30;

[0070] The sliding member 24 is slidably connected to the slot body 25;

[0071] Specifically, the groove body 25 may be an inverted T-shaped structure, and the sliding member 24 matches the T-shaped structure and is slidably located in the groove body 25;

[0072] In this example, the connecting block 31 on the expansion bladder 30 is movably connected to the sliding member 24. When the expansion bladder 30 seals the drill hole well, the expansion bladder 30 can adaptively drive the sliding member 24 to slide when deformed, so that the support frame 21 can be linked to expand. That is, when the expansion bladder 30 is fixedly connected to the support frame 21, the volume of the expansion bladder 30 changes differently due to the different inner diameters of the drill hole. At this time, uneven force will occur at the connection between the expansion bladder 30 and the support frame 21. For example, when the inner diameter of the drill hole is large, if the distance from the connection to the axis is small, when the expansion bladder 30 drives the support frame 21 to expand, in order to ensure that the expansion bladder 30 seals the drill hole, "tearing" will occur at the connection, thereby reducing the service life of the expansion bladder 30.

[0073] Furthermore, the sliding member 24 and the connecting block 31 are connected by a ball hinge;

[0074] That is, when the sliding member 24 and the connecting block 31 are ball-jointed, the ball joint can be adjusted in any direction within a certain angle, thereby avoiding the situation where the expansion direction of the expansion bladder 30 is uncertain after the expansion bladder 30 is filled with the medium;

[0075] Further, such as Figure 6 As shown, the inner side of the support frame 21 has a bending section 27, and is connected to the support rod 10 through the ear seat 23;

[0076] When the support frame 21 is unfolded to a certain angle, the bending section 27 contacts the ear seat 23 to limit the angle;

[0077] Specifically, the bending part of the support frame 21 is connected to the ear seat 23 through the support shaft 26, and the ear seat 23 is fixed on the support rod 10; the bending section 27 of the support frame 21 is used to limit the expansion angle of the support frame 21. Preferably, the maximum expansion angle is 90°, so as to avoid the support frame 21 being unable to limit the axial expansion of the expansion bladder 30.

[0078] In some examples of the present invention, Figure 3 As shown, the second protection frame 40 includes a middle sleeve and at least one pair of support rods;

[0079] The sleeve is slidably mounted on the support rod 10 and fixed by a locking rod;

[0080] At least one pair of supporting rods are evenly connected to the circumference of the sleeve and extend outwards;

[0081] Specifically, the first protection frame 20 and the second protection frame 40 may be of the same structure, for example, both include a support frame 21 and a support body 22, and as the expansion bladder 30 is expanded or contracted, at this time, the expanded end of the support frame 21 is directed toward the expansion bladder 30. In this state, when the expansion bladder 30 is filled with a medium, the first protection frame 20 and the second protection frame 40 can both act on the inner wall of the drill hole to form a preliminary blockage, thereby enhancing the overall effect;

[0082] Alternatively, the first protection frame 20 and the second protection frame 40 both include a sleeve and a support rod, the sleeve slides on the support rod 10 to limit the expansion bladder 30 in the axial direction, and at least one pair of support rods is used to limit the axial end side of the expansion bladder 30 to enhance the effect of the circumferential side of the expansion bladder 30 on the inner wall of the borehole; Figure 3 As shown, for example, two pairs of struts form a cross-shaped structure;

[0083] Alternatively, the first protective frame 20 includes a supporting skeleton 21 and a supporting body 22, and the second protective frame 40 includes a sleeve and a support rod. The two are used in combination. On the one hand, the first protective frame 20 can close the side of the sealing device 100 close to the orifice, and on the other hand, the second protective frame 40 can adjust the size of the expansion bladder 30 in the axial direction to enable its radial expansion to be better closed.

[0084] In some examples of the present invention, the medium in the medium source is a phase change material;

[0085] Specifically, the medium filled in the expansion bladder 30 can be a phase change material such as water. When a large amount of heat accumulates inside the coal seam, the phase change material in the expansion bladder 30 absorbs heat and changes under the influence of a certain temperature, thereby appropriately reducing the temperature of the coal seam.

[0086] In addition, since the sampling interval for coal quality analysis in open-pit coal mines is short and the drill holes are evenly distributed throughout the entire coal seam mining surface, the ground temperature can be well regulated, reducing high temperature disasters and coal seam spontaneous combustion disasters.

[0087] In some examples of the present utility model, the support rod 10 is provided with a connection nozzle 51 at one end facing the drilling hole;

[0088] The pipe fitting of the plugging device 100 is pushed into the drilled hole and connected to the connecting nozzle 51 for medium input or output;

[0089] Specifically, the pipe fitting is used to push the plugging device 100 into the borehole and reach a suitable position. For example, the pipe fitting can be a liquid injection pipe or a gas injection pipe, and the end is provided with a nozzle that is quickly connected to the connecting nozzle 51. When connected to each other, the pipe fitting is connected to the support rod 10, and the medium can enter the hollow structure of the support rod 10 through the pressure difference to communicate, and the medium smoothly enters the expansion bladder 30 to expand it. When the expansion bladder 30 completes the plugging of the borehole, the pipe fitting is separated from the support rod 10, and the connecting nozzle 51 is in a closed state. When the expansion bladder 30 is depressurized, it is also connected and the pressure difference is used to return the gas / liquid in the expansion bladder 30, thereby realizing the recycling and reuse of the plugging device 100;

[0090] Furthermore, a pressure sensor is provided on the pipe fitting, and a pump body is provided on the medium source;

[0091] The controller receives the signal from the pressure sensor and controls the opening and closing of the pump body;

[0092] Specifically, the pressure sensor is used to detect the medium pressure in the pipe. When the expansion bladder 30 expands and contacts the inner wall of the borehole, the pressure sensor transmits a signal to the controller, and the controller stops the pump body from working.

[0093] In some examples of the present invention, the blocking device 100 is multiple;

[0094] Multiple plugging devices 100 are arranged in layers along the depth of the borehole;

[0095] Specifically, according to the drilling depth and coal seam mining process (single-layer mining thickness), multiple plugging devices 100 can be selected to plug the drill holes in layers to ensure that each layer of the drill holes is always in a closed state during the layered mining process. When multiple plugging devices 100 are used, in order to ensure the accuracy of the layered plugging position, the position of the plugging device 100 can be measured by a grouting pipe (pipe fitting), and gas / phase change material injection can be performed after it is lowered to the target position.

[0096] When the open-pit coal mine sampling borehole plugging device is used, a borehole is firstly drilled in the open-pit coal mine for coring. After the coring is completed, the plugging device 100 which is not filled with a medium is placed in the borehole, and the hole opening can be closed. At this time, the expansion bladder 30 is in a contracted state.

[0097] When the plugging device 100 is lowered to a suitable position, a medium is filled into the expansion capsule 30, preferably a phase change material is used, the phase change material enters the hollow structure of the support rod 10 from the medium source, and then enters the expansion capsule 30 from the through hole 11, and can absorb heat and change, thereby appropriately reducing the temperature of the coal seam;

[0098] As the phase change material is filled, the volume of the expansion bladder 30 gradually increases, and the first protection frame 20 and the second protection frame 40 can limit the expansion range of the expansion bladder 30 in the axial direction and can perform preliminary blocking, that is:

[0099] When the volume of the expansion bladder 30 increases, the position of the sliding member 24 on the support frame 21 is adjusted by the connecting block 31 to adapt to the expansion effect of the expansion bladder 30, so that the support frame 21 drives the support body 22 to expand, forming an open "umbrella" shape. At this time, not only the surrounding side of the support body 22 can initially block the inner wall of the borehole, but also the support body 22 can block the borehole after it is expanded, effectively protecting the expansion bladder 30 and preventing the expansion bladder 30 from being damaged by excessive pressure due to falling rocks or the like;

[0100] The volume of the expansion bladder 30 increases until it fits tightly against the borehole wall, thereby supporting and sealing the borehole and preventing the coal seam in the borehole from spontaneously igniting.

[0101] After mining, the plugging device 100 can be recovered and reused by relieving the pressure on the expansion bag.

[0102] The above text describes in detail the exemplary implementation of the open-pit coal mine sampling drilling hole plugging device proposed by the utility model with reference to the preferred embodiments. However, those skilled in the art will appreciate that, without departing from the concept of the utility model, various modifications and variations can be made to the above-mentioned specific embodiments, and various technical features and structures proposed in the utility model can be combined in various ways without exceeding the protection scope of the utility model. The protection scope of the utility model is determined by the attached claims.

Claims

1. A plugging device for sampling a borehole in an open-pit coal mine, wherein the plugging device (100) is pushed into the borehole, and is characterized in that: include: The support rod (10) is a hollow structure, one end of which is connected to a medium source, the other end of which is closed, and the peripheral side of which is provided with at least one through hole (11) communicating with the hollow structure; The first protection frame (20) and the second protection frame (40) are connected to the support rod (10) at an axial interval, and the distance between the outer contour of the first protection frame (20) and the second protection frame (40) and the axis is smaller than the diameter of the drilled hole, so that the first protection frame (20) and the second protection frame (40) can move in the drilled hole; The expansion bladder (30) is sleeved on the support rod (10) and connected between the first protection frame (20) and the second protection frame (40); the interior of the expansion bladder (30) is communicated with the through hole (11).

2. The open-pit coal mine sampling borehole plugging device according to claim 1, characterized in that: The first protection frame (20) is located close to the drilling hole and comprises: A plurality of support frames (21) are evenly arranged around a circle, each support frame (21) is connected to an expansion bladder (30) and is rotatably mounted on the support rod (10) on its inner side; A support body (22) connected to the plurality of support frames (21), connected to the support rods (10) on the inner side, and having a circumference larger than the outer contour of the support frames (21); Wherein, under the effect of the volume change of the expansion bladder (30), the outer end of the support frame (21) can drive the support body (22) to expand or contract in a direction away from or close to the expansion bladder (30).

3. The open-pit coal mine sampling borehole plugging device according to claim 2, characterized in that: The support frame (21) is provided with a groove body (25) along its length direction; A connecting block (31) movably connected to the sliding member (24) is fixed on the expansion bladder (30); Wherein, the sliding member (24) is slidably connected to the groove body (25).

4. The open-pit coal mine sampling borehole plugging device according to claim 3, characterized in that: The sliding member (24) and the connecting block (31) are connected by a ball joint.

5. The open-pit coal mine sampling borehole plugging device according to claim 2, characterized in that: The inner side of the support frame (21) has a bending section (27) and is connected to the support rod (10) via an ear seat (23); when the support frame (21) is unfolded to a certain angle, the bending section (27) contacts the ear seat (23) to limit the angle.

6. The open-pit coal mine sampling borehole plugging device according to any one of claims 2 to 5, characterized in that: The second protection frame (40) comprises a middle sleeve and at least one pair of supporting rods; The sleeve is slidably mounted on the support rod (10) and is fixed by a locking rod; At least one pair of supporting rods are evenly connected to the circumference of the sleeve and extend outwards.

7. The open-pit coal mine sampling borehole plugging device according to any one of claims 1 to 5, characterized in that: The medium in the medium source is a phase change material.

8. The open-pit coal mine sampling borehole plugging device according to any one of claims 1 to 5, characterized in that: The support rod (10) is provided with a connecting nozzle (51) at one end facing the drilling hole; The plugging device (100) is pushed into the pipe of the drilled hole and connected to the connecting nozzle (51) for medium input or output.

9. The open-pit coal mine sampling borehole plugging device according to claim 8, characterized in that: The pipe is provided with a pressure sensor, and the medium source is provided with a pump body; The controller receives the signal from the pressure sensor and controls the opening and closing of the pump body.

10. The open-pit coal mine sampling borehole plugging device according to any one of claims 1 to 5, characterized in that: There are multiple blocking devices (100); A plurality of plugging devices (100) are arranged in layers along the depth of the borehole.

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