Blast hole sealing device for coal mine underground top cutting blasting

Abstract

The utility model relates to the technical field of coal mines, in particular to a blast hole sealing device for coal mine underground top cutting blasting, which is characterized in that the top of a top frame is fixedly connected with a top plate, the top of the top plate is fixedly connected with a hydraulic oil cylinder through a bolt, and an output shaft of the hydraulic oil cylinder penetrates through the top plate and is fixedly connected with the top of a fixed plate; a plurality of supporting rods are fixedly connected to the bottom of the fixing plate, the extending ends of all the supporting rods sequentially penetrate through the top of the top frame and the side wall of the bearing cylinder, and an annular plate is fixedly connected to the bottom of the fixing plate. Through the design of the supporting rod and the inserting rod, connection between the hole sealing device and the inner wall of the blast hole is firmer, the problem that traditional hole sealing materials such as yellow mud fail to be sprayed out due to axial impact force generated by explosive explosion is solved, and therefore the overall stability and sealing performance of blast hole sealing are improved; the whole device can be tightly attached to the inner wall of the blast hole, and stability is achieved through a mechanical structure instead of a loose hole sealing agent.

Description

Technical Field

[0001] This utility model relates to the field of coal mining technology, and in particular to a sealing device for blasting holes used in underground roof cutting blasting in coal mines. Background Technology

[0002] Sealing the blasting holes is a crucial step in underground roof-cutting blasting operations in coal mines. Its function is to effectively seal the blasting holes after the explosive charge is applied, ensuring sufficient blasting pressure upon detonation to achieve directional fracturing and shearing of the roof rock. Good sealing not only improves blasting efficiency but also reduces the diffusion of harmful gases and dust generated during blasting, ensuring a safe underground working environment. As a core component of the blasting process, the structural design of the blasting hole sealing device and the performance of the sealing materials have a decisive impact on the overall blasting effect, safety, and construction efficiency.

[0003] Especially in the core step of sealing blasting holes, existing sealing equipment and methods have gradually revealed a series of obvious limitations and technical problems when dealing with complex conditions such as deep holes and large charges. For example, utility model patent CN212458150U discloses a deep hole blasting sealing device and structure, belonging to the field of deep hole blasting technology. Currently, deep hole blasting sealing mostly uses yellow mud or traditional sealing agents. In field construction, it has been found that due to the long charge length and large charge volume, the explosive detonation generates a large axial impact force, causing loose sealing materials such as yellow mud to easily fail and be ejected, resulting in blowouts, which seriously affect the blasting effect and bring significant safety hazards. In addition, existing sealing agents are loose in material and do not easily solidify, making it difficult to accurately deliver them to the designated position in the deep hole during transportation. Moreover, after delivery, they are difficult to fully contact with water to achieve expansion and solidification, resulting in insufficient sealing strength and unstable sealing effect.

[0004] The connection between the existing blast hole sealing device and the inner wall of the blast hole is not firm, making the entire sealing structure prone to displacement or even detachment under blasting impact, further reducing the overall stability and sealing performance of the blast hole. These problems not only significantly increase construction difficulty and rework rate, but also pose potential threats to mine production safety, failing to meet the demands of efficient, safe, and environmentally friendly blasting operations in modern underground coal mines. Therefore, to address the numerous shortcomings of existing technologies, there is an urgent need for a blast hole sealing device for underground roof-cutting blasting in coal mines to solve the aforementioned problems. Utility Model Content

[0005] The purpose of this utility model is to provide a sealing device for blasting holes used in underground roof cutting blasting in coal mines. This device solves the problem that the connection between the sealing device and the inner wall of the blasting hole in the prior art is not firm, which makes the entire sealing structure prone to displacement or even detachment when subjected to blasting impact, thus reducing the overall stability and sealing performance of the blasting hole sealing.

[0006] To achieve the above objectives, this utility model provides a sealing device for blasting holes in underground coal mine roof cutting blasting, including a top frame, a bearing cylinder fixedly connected to the bottom of the top frame, and a fixing plate slidably connected to the inner side of the top frame;

[0007] A top plate is fixedly connected to the top of the top frame, and a hydraulic cylinder is fixedly connected to the top of the top plate by bolts. The output shaft of the hydraulic cylinder passes through the top of the top plate and is fixedly connected to the top of the fixed plate. Several support rods are fixedly connected to the bottom of the fixed plate, and the extension ends of all the support rods pass through the top of the top frame and the side wall of the bearing cylinder in sequence. An annular plate is fixedly connected to the bottom of the fixed plate, and several vertical rods are fixedly connected to the bottom of the annular plate. A bottom plate is provided at the bottom of the bearing cylinder, and the bottom ends of all the vertical rods are fixedly connected to the top of the bottom plate. Several insert rods are fixedly connected to the bottom of the bottom plate.

[0008] The outer side of the bearing cylinder is fitted with an annular airbag, and several support rods are fixedly connected to the outer side of the annular airbag. An air pump is fixedly connected to one side of the outer wall of the top frame by bolts, and the outlet of the air pump is connected to the top side of the annular airbag.

[0009] The fixed plate has sliders fixedly connected to both sides, and both sliders are slidably connected to the side wall of the top frame through a sliding groove.

[0010] The air pump outlet is connected to an air pipe, and one end of the air pipe passes through the top of the top frame and connects with the top side of the annular airbag.

[0011] The connection between the output shaft of the hydraulic cylinder and the top plate is a sliding connection.

[0012] All the support rods are connected to the bearing cylinder by sliding connection, and the lower part of all the support rods is arc-shaped.

[0013] This utility model discloses a sealing device for blasting holes in underground coal mine roof cutting blasting. Through the design of support rods and insertion rods, the connection between the sealing device and the inner wall of the blasting hole is more secure, avoiding the problem of traditional sealing materials such as mud failing and spraying out due to the axial impact force generated by the explosive explosion. This improves the overall stability and sealing performance of the blasting hole sealing. Secondly, because the entire device can tightly fit the inner wall of the blasting hole and achieve stability through mechanical structure rather than loose sealing agent, it not only solves the problems of traditional sealing agents being difficult to accurately deliver to the designated position in deep holes and having poor expansion and solidification effects, but also ensures the stability and reliability of the sealing quality. Furthermore, this new sealing device is easy to operate, reducing construction difficulty and rework rate, helping to improve blasting operation efficiency and reduce safety hazards. Compared with existing technical solutions, this device, while ensuring blasting effect, also significantly improves the safety and environmental performance of mine production, meeting the needs of modern coal mine underground blasting operations for high efficiency, safety, and environmental protection. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0015] Figure 1 This is a schematic diagram of the overall main view structure of an embodiment of this utility model.

[0016] Figure 2 This is a bottom view of the structure of an embodiment of the present invention.

[0017] Figure 3 This is a side view structural diagram of an embodiment of the present utility model.

[0018] Figure 4 This is a schematic diagram of the bottom structure of the bearing cylinder according to an embodiment of the present utility model.

[0019] Figure 5 This is a schematic diagram of the support rod structure according to an embodiment of the present utility model.

[0020] 1. Top frame; 2. Bearing cylinder; 3. Annular airbag; 4. Support rod; 5. Support rod; 6. Base plate; 7. Insert rod; 8. Vertical rod; 9. Annular plate; 10. Top plate; 11. Fixing plate; 12. Hydraulic cylinder; 13. Slider; 14. Slide groove; 15. Air pump; 16. Air pipe. Detailed Implementation

[0021] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0022] Please see Figure 1-5 ,

[0023] A sealing device for blasting holes in underground coal mine roof cutting blasting includes a top frame 1, a bearing cylinder 2 fixedly connected to the bottom of the top frame 1, and a fixing plate 11 slidably connected to the inner side of the top frame 1.

[0024] A top plate 10 is fixedly connected to the top of the top frame 1, and a hydraulic cylinder 12 is fixedly connected to the top of the top plate 10 by bolts. The output shaft of the hydraulic cylinder 12 passes through the top of the top plate 10 and is fixedly connected to the top of the fixed plate 11. Several support rods 5 are fixedly connected to the bottom of the fixed plate 11, and the extension ends of all the support rods 5 pass through the top of the top frame 1 and the side wall of the bearing cylinder 2 in sequence. An annular plate 9 is fixedly connected to the bottom of the fixed plate 11, and several vertical rods 8 are fixedly connected to the bottom of the annular plate 9. A bottom plate 6 is provided at the bottom of the bearing cylinder 2, and the bottom ends of all the vertical rods 8 are fixedly connected to the top of the bottom plate 6. Several insertion rods 7 are fixedly connected to the bottom of the bottom plate 6.

[0025] First, the support cylinder 2 is inserted into the blast hole, and the bottom of the top frame 1 covers the top of the blast hole. Next, the hydraulic cylinder 12 is activated, and its output shaft drives the fixed plate 11 downwards. As the fixed plate 11 moves downwards, several support rods 5 fixed to its bottom also extend. These support rods 5 are designed to insert into the inner wall of the blast hole to enhance the stability of the connection between the entire device and the blast hole. Simultaneously, an annular plate 9 is fixedly connected to the bottom of the fixed plate 11. Several vertical rods 8 are located at the bottom of the annular plate 9, and the bottom ends of these vertical rods 8 are fixedly connected to the top of the base plate 6. As the fixed plate 11 moves downwards, the base plate 6 and its bottom insert rods 7 also move downwards accordingly until the insert rods 7 are inserted into the bottom of the blast hole, further stabilizing the position of the support cylinder 2. In this way, the combined action of the support rods 5 and the insert rods 7 greatly enhances the stability of the device within the blast hole.

[0026] Furthermore, an annular airbag 3 is fitted onto the outer side of the bearing cylinder 2, and several support rods 4 are fixedly connected to the outer side of the annular airbag 3. An air pump 15 is bolted to one side of the outer wall of the top frame 1, with the outlet of the air pump 15 connected to the top side of the annular airbag 3. First, the bearing cylinder 2 is inserted into the blast hole, and then the air pump 15 is activated, inflating the annular airbag 3 through the air pipe 16. As the annular airbag 3 expands, the support rods 4 fixed to its outer side extend outwards, tightly fitting against the inner wall of the blast hole, thereby further enhancing the sealing and stability between the device and the blast hole. This design significantly improves the sealing effect of the sealing device within the blast hole and enhances the overall structural stability.

[0027] Furthermore, sliders 13 are fixedly connected to both sides of the fixed plate 11, and both sliders 13 are slidably connected to the side wall of the top frame 1 through a sliding groove 14. When the hydraulic cylinder 12 drives the fixed plate 11 to move up and down, the sliders 13 slide along the sliding groove 14, ensuring the smooth movement of the fixed plate 11. This design achieves the effect of enabling the fixed plate 11 and its connecting parts to move up and down smoothly and accurately, improving the operational stability and reliability of the entire device, and reducing the operational difficulty and potential risks caused by offset or jamming.

[0028] Furthermore, an air pipe 16 is connected to the outlet of the air pump 15, and one end of the air pipe 16 passes through the top of the top frame 1 and connects with one side of the top of the annular airbag 3. This means that the gas output from the air pump 15 is directly delivered to the annular airbag 3 through the air pipe 16. This configuration allows the annular airbag 3 to be inflated quickly and effectively to meet the needs of rupture holes of different diameters. This design achieves rapid and accurate adjustment of the pressure and size of the annular airbag 3, ensuring that it can fit tightly against the inner wall of the rupture hole, providing good sealing performance, while also facilitating disassembly and reuse.

[0029] Furthermore, the connection between the output shaft of the hydraulic cylinder 12 and the top plate 10 is a sliding connection.

[0030] Furthermore, all the connections between the support rods 5 and the bearing cylinder 2 are sliding connections, and the lower parts of all the support rods 5 are arc-shaped. When the support rods 5 are inserted into the inner wall of the blast hole, this sliding connection allows the support rods 5 to flexibly adjust their angles according to actual needs, while the arc-shaped distribution helps to evenly distribute pressure and increase the contact area with the inner wall of the blast hole. This design improves the stability and firmness of the contact between the support rods 5 and the inner wall of the blast hole, effectively preventing the failure of the support rods 5 due to local stress concentration, and improving the overall safety and reliability of the sealing device.

[0031] In summary:

[0032] First, the bearing cylinder 2 is inserted into the blast hole, and the bottom of the top frame 1 covers the top of the blast hole, providing initial positioning and protection. Then, the hydraulic cylinder 12 is activated, driving the fixed plate 11 downwards along the sliding path inside the top frame 1 via its output shaft. During this process, the sliding connection between the fixed plate 11 and the top frame 1 is achieved by the slider 13 and the groove 14, ensuring the smooth movement of the fixed plate 11 and preventing jamming or displacement. As the fixed plate 11 moves downwards, several support rods 5 fixed at its bottom pass through the top of the top frame 1 and the side wall of the bearing cylinder 2, extending to the inner wall of the blast hole. The support rods 5 are slidably connected to the bearing cylinder 2, and their lower parts are arc-shaped, allowing the support rods 5 to flexibly adjust their angle according to the actual hole wall shape, thus contacting the hole wall surface more evenly and enhancing the anchoring force. Meanwhile, a ring plate 9 is fixed to the bottom of the fixed plate 11, and multiple vertical rods 8 are provided below the ring plate 9. The ends of these vertical rods 8 are connected to the top of the base plate 6, and several insertion rods 7 are fixed to the bottom of the base plate 6. As the fixed plate 11 continues to move downward, the base plate 6 and the insertion rods 7 below it descend accordingly and eventually insert into the bottom of the blast hole, further enhancing the longitudinal stability of the entire device. In addition, in order to improve the sealing and fit between the sealing device and the blast hole, an annular airbag 3 is sleeved on the outside of the bearing cylinder 2. Multiple support rods 4 are fixed to the outside of the annular airbag 3 to apply uniform pressure to the inner wall of the blast hole after expansion. At the same time, an air pump 15 is bolted to one side of the top frame 1 and connected to the top of the annular airbag 3 through an air pipe 16. After the mechanical support structure is deployed, the air pump 15 is started, and gas is delivered to the inside of the annular airbag 3 through the air pipe 16, causing it to expand rapidly, driving the support rods 4 to expand outward and fit tightly against the inner wall of the blast hole, forming a good sealing effect and preventing the sealing material from being ejected or the blast gas from leaking during blasting. First, the hydraulic cylinder 12 drives the fixed plate 11, which in turn drives the support rod 5 and the insertion rod 7 to insert into the inner wall and bottom of the blast hole. This solves the problem of weak connection between the sealing device and the inner wall of the blast hole in the prior art, effectively improving the overall stability of the sealing structure and reducing the risk of sealing failure due to displacement or detachment during blasting. Second, the cooperative design of the slider 13 and the groove 14 ensures the stability and accuracy of the fixed plate 11 during its up-and-down movement, improving the safety and reliability of operation and reducing unstable factors during construction. Furthermore, the sliding connection between the support rod 5 and the bearing cylinder 2, as well as the arc-shaped distribution design at its lower part, gives the support rod 5 stronger adaptability and fit when inserted into the inner wall of the blast hole, effectively dispersing local stress and preventing the support rod 5 from breaking or falling out due to stress concentration, further improving the impact resistance and service life of the sealing device. Meanwhile, the setting of the annular airbag 3 and the support rod 4, combined with the inflation system of the air pump 15 and the air pipe 16, realizes the dynamic adjustment of the sealing performance between the sealing device and the burst hole, making up for the problems of traditional yellow mud sealing materials being difficult to deliver accurately and having poor expansion and solidification effects, thus improving sealing efficiency and quality.

[0033] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A sealing device for blasting holes used in underground roof cutting blasting in coal mines, comprising a top frame, characterized in that, It also includes a bearing cylinder fixedly connected to the bottom of the top frame, and a fixing plate slidably connected to the inner side of the top frame; A top plate is fixedly connected to the top of the top frame, and a hydraulic cylinder is fixedly connected to the top of the top plate by bolts. The output shaft of the hydraulic cylinder passes through the top of the top plate and is fixedly connected to the top of the fixed plate. Several support rods are fixedly connected to the bottom of the fixed plate, and the extension ends of all the support rods pass through the top of the top frame and the side wall of the bearing cylinder in sequence. An annular plate is fixedly connected to the bottom of the fixed plate, and several vertical rods are fixedly connected to the bottom of the annular plate. A bottom plate is provided at the bottom of the bearing cylinder, wherein the bottom ends of all the vertical rods are fixedly connected to the top of the bottom plate. Several insertion rods are fixedly connected to the bottom of the bottom plate.

2. The blasting hole sealing device for underground roof cutting blasting in coal mines as described in claim 1, characterized in that, An annular airbag is sleeved on the outside of the bearing cylinder, and several support rods are fixedly connected to the outside of the annular airbag. An air pump is fixedly connected to one side of the outer wall of the top frame by bolts, and the outlet of the air pump is connected to the top side of the annular airbag.

3. The blasting hole sealing device for underground roof cutting blasting in coal mines as described in claim 1, characterized in that, Both sides of the fixed plate are fixedly connected to sliders, and both sliders are slidably connected to the side wall of the top frame through a sliding groove.

4. A sealing device for blasting holes in underground coal mine roof cutting blasting as described in claim 2, characterized in that, The outlet of the air pump is connected to an air pipe, and one end of the air pipe passes through the top of the top frame and is connected to the top side of the annular airbag.

5. A sealing device for blasting holes in underground coal mine roof cutting blasting as described in claim 1, characterized in that, The connection between the output shaft of the hydraulic cylinder and the top plate is a sliding connection.

6. The blasting hole sealing device for underground roof cutting blasting in coal mines as described in claim 1, characterized in that, All of the support rods are slidably connected to the bearing cylinder, and the lower part of all the support rods is arc-shaped.

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