Underground coal mine hydraulic fracturing anti-channeling rod device

Abstract

The invention discloses a hydraulic fracturing anti-channeling rod device for an underground coal mine, and belongs to the field of mining equipment. Comprising a packing part, one end of the packing part is rotationally connected with a connecting base, the other end of the packing part is fixedly connected with a deslagging assembly, an inner pipe column is rotationally connected into the packing part, and one end of the inner pipe column is fixedly connected with the connecting base; the deslagging assembly comprises a fixed seat fixedly connected to one end of the packing part, an annular pushing plate fixedly connected to the outer wall of the fixed seat, a damping coupling and a rotating part which are rotationally connected to the interior of the fixed seat, and a plurality of rotary scraping parts connected to one side of the rotating part, and one side of the rotating part is fixedly connected with one side of the damping coupling; mud cakes on the inner wall of the shaft can be cleaned through the rotary scraping part, the target sealing section shaft is purified before setting, a uniform and reliable contact face is provided for a rubber sealing ring, a rubber sleeve can make direct contact with metal, sealing stress distribution is uniform, and the sealing reliability of the packer is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of mining equipment, and more specifically, to a hydraulic fracturing anti-slip rod device for coal mines. Background Technology

[0002] Hydraulic fracturing in coal mines is an engineering technique implemented in coal seams or rock formations underground. Its core principle is to artificially create and expand a network of fractures in the target coal / rock formation using high-pressure water (or an aqueous solution containing additives).

[0003] In hydraulic fracturing, multiple fractures are typically fracturing in layers. During the fracturing of one layer, to prevent high-pressure fluid and proppant (sand) from seeping into the fractures of other layers (i.e., backflow or leakage), packers (also known as anti-flow rods) are used for mechanical isolation, ensuring that the high-pressure fluid acts precisely on the target area. It is the core device for achieving layered fracturing, directional fracture creation, and construction safety.

[0004] However, during drilling, completion, and cementing operations, mud cake may exist inside the wellbore (during drilling, drilling fluid is pumped into the wellbore under high pressure, and solid particles in the drilling fluid (such as bentonite and barite) are embedded in the micro-cracks of the well wall under pressure differential, forming a dense filter cake after dehydration). The packer relies on the rubber sleeve (rubber or composite material) to tightly fit against the well wall after radial expansion, forming a full-circumferential, gapless annular seal. When there are contaminants in the wellbore, the contaminants prevent the rubber sleeve from directly contacting the metal well wall surface, destroying the necessary condition for the formation of a continuous, uniform, and highly intact sealing interface between the packer rubber sleeve and the well wall / casing, leading to packer seal failure. Summary of the Invention

[0005] In view of the problem that the sealing of hydraulic fracturing packers in coal mines fails due to mud cake in the shaft, the purpose of this invention is to provide a hydraulic fracturing anti-channeling rod device for coal mines.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A hydraulic fracturing anti-channeling rod device for coal mines includes a sealing part, one end of which is rotatably connected to a connecting seat, and the other end of which is fixedly connected to a slag removal component. An inner tube is rotatably connected inside the sealing part, and one end of the inner tube is fixedly connected to the connecting seat.

[0008] The slag removal assembly includes a fixed seat fixed to one end of the sealing part, an annular pusher plate fixed to the outer wall of the fixed seat, a damping coupling and a rotating part rotatably connected inside the fixed seat, and multiple scraping parts connected to one side of the rotating part. One side of the rotating part is fixedly connected to one side of the damping coupling, and the other end of the inner tube column is fixedly connected to one side of the damping coupling.

[0009] The fixing base includes a connecting end one fixed to one end of the sealing part, a connecting end two fixed to the other side of the connecting end one, and a damping element connected between the connecting end one and the connecting end two.

[0010] Optionally, the rotating part includes a rotating disk rotatably connected inside the connecting end two and a plurality of connecting members fixed to one side of the rotating disk. The other end of the plurality of connecting members is fixed to one side of the damping coupling, and the plurality of scraping parts are rotatably connected to the other side of the rotating disk.

[0011] Optionally, the rotating disk is rotatably connected to a plurality of connecting columns, and a plurality of gears are rotatably connected to one side of the rotating disk. One end of each of the plurality of connecting columns is fixedly connected to a plurality of gears, and the other end is fixedly connected to a plurality of scraping parts. The connecting end two is provided with a tooth groove that meshes with the plurality of gears, and the plurality of gears are located inside the connecting end two.

[0012] Optionally, the outer surface of the scraping part includes a horizontal surface and an inclined surface, and multiple toothed flanges are integrally formed on both the horizontal surface and the inclined surface.

[0013] Optionally, multiple feed grooves are provided on the outer surfaces of the multiple scraping parts, and an inner cavity communicating with the multiple feed grooves is provided inside the multiple scraping parts. A discharge port communicating with the inner cavity is provided at one end of the multiple scraping parts.

[0014] Optionally, an auger is rotatably connected inside the cavity, and both ends of the auger are rotatably connected to the inner wall of the cavity. A drive unit is connected inside the damping coupling, and the drive unit passes through the damping coupling, gear one, and connecting column and is fixedly connected to one end of the auger.

[0015] Optionally, the drive unit includes multiple movable slots formed inside the damping coupling, multiple gears 2 respectively rotatably connected inside the multiple movable slots, and multiple connecting rods respectively rotatably connected inside the multiple gears 1 and the connecting column. One end of the multiple connecting rods passes through the damping coupling and is fixedly connected to the gear 2, and the other end of the connecting rod passes through the scraping part into the inner cavity and is fixedly connected to one end of the auger. The connecting end 2 is provided with tooth groove 2 that meshes with the multiple gears 2.

[0016] Optionally, a cleaning assembly is also connected to one side of the rotating disk, and the cleaning assembly includes multiple rotating columns rotatably connected to one side of the rotating disk and multiple cleaning flanges fixed to the outside of the multiple rotating columns. On the other side of the rotating disk, multiple gears three are rotatably connected to each of the multiple gears one, and the multiple gears three are fixed to the multiple rotating columns respectively.

[0017] Optionally, the inner tubular column, the connecting seat, and the damping coupling are all provided with infusion channels inside.

[0018] Optionally, a nozzle is fixedly connected to one side of the rotating disk, and a pipe is fixedly connected to the liquid delivery channel inside the damping coupling. One end of the pipe is connected to the input end of the nozzle, and the spraying end of the nozzle faces the swirl scraper.

[0019] Compared with the prior art, the technical solution provided by this invention has at least the following beneficial effects:

[0020] In the above scheme, by setting up a slag removal component, the damping coupling is driven to rotate inside the fixed seat through the inner tubing string. The rotation of the damping coupling drives the rotating part and the scraping part to rotate, so that the scraping part can rotate inside the wellbore. The scraping part can clean the mud cake on the inner wall of the wellbore, purify the target sealing section of the wellbore before setting, provide a uniform and reliable contact surface for the rubber sealing ring, so that the rubber sleeve can directly contact the metal, the sealing stress is evenly distributed, and the reliability of the packer seal is guaranteed.

[0021] By setting up gear one and connecting column, when the rotating disk rotates inside the connecting end two, the tooth groove one on the inner wall of the connecting end two can drive gear one to rotate. The rotation of gear one drives the connecting column and the swirl scraper to rotate, so that the swirl scraper can also rotate on its own axis while rotating with the rotating disk. The rotation of the swirl scraper, combined with its own rotation, can generate local high-frequency impact, so that the tip of the swirl scraper tooth can generate point load to break the mud / rock chips, improving the removal efficiency of hard objects. At the same time, the rotation generates a centrifugal throwing effect, which can throw off the cut mud cake debris, avoid secondary adhesion to the swirl scraper, remove chips faster, and also distribute the wear of the swirl scraper teeth, extending the overall service life.

[0022] By providing a feed chute and an inner cavity inside the swirl scraper, and installing an auger in the inner cavity, mud adhering to the swirl scraper can enter the inner cavity through the feed chute, avoiding material accumulation and jamming caused by low material discharge efficiency of the swirl scraper. When the rotating disk rotates, the toothed groove on the inner wall of the second connecting end drives the second gear to rotate. The second gear drives the auger to rotate in the inner cavity through the connecting rod. The auger can discharge the mud in the inner cavity, preventing it from getting stuck between the cutting teeth, ensuring that the cutting edge always has a sharp contact surface, reducing the eccentric vibration and sudden increase in cutting force caused by mud accumulation, and improving cutting stability. Attached Figure Description

[0023] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the invention and, together with the specification, further serve to explain the principles of the invention and enable those skilled in the art to practice and use the invention.

[0024] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of the sealing part and the infusion channel of the present invention;

[0026] Figure 3 This is a schematic diagram of the internal tubular column of the present invention;

[0027] Figure 4 This is a schematic diagram of the slag removal component of the present invention;

[0028] Figure 5 This is a cross-sectional view of the slag removal component of the present invention;

[0029] Figure 6 This is a schematic diagram of the structure of the rotating part and the driving part of the present invention;

[0030] Figure 7 This is a bottom view of the structure of gear one, connecting column, gear two, connecting rod and feed groove of the present invention;

[0031] Figure 8 This is a schematic diagram of the structure of tooth groove one and tooth groove two of the present invention;

[0032] Figure 9 This is a cross-sectional view of the scraping part of the present invention;

[0033] Figure 10 This is a schematic diagram of the structure of the connector, gear one, gear two, and gear three of the present invention;

[0034] Figure 11 This is a schematic diagram of the track structure of the present invention.

[0035] [Figure Labels]

[0036] 1. Sealing section; 11. Tube column; 12. Rubber sleeve section; 13. Slip section; 14. Pin section; 15. Track; 2. Slag removal assembly; 21. Fixing base; 211. Connection end one; 212. Connection end two; 213. Damping component; 214. Damping coupling; 22. Annular pusher plate; 23. Scraper section; 231. Feed chute; 232. Inner cavity; 233. Discharge port; 234. Screwdriver; 24. Rotating part; 241. Rotating disc; 242. Gear 1; 243. Connecting column; 244. Gear 1; 245. Connecting piece; 25. Drive unit; 251. Movable groove; 252. Gear 2; 253. Connecting rod; 254. Gear 2; 26. Scraping assembly; 261. Rotating column; 262. Scraping flange; 263. Gear 3; 27. Nozzle; 28. Pipeline; 3. Connecting seat; 4. Inner tube column; 5. Infusion channel.

[0037] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0038] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should also be noted that, to make the embodiments more comprehensive, the following embodiments are the best and preferred embodiments, and those skilled in the art can use other alternative methods to implement some well-known technologies; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0039] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.

[0040] Generally, terms can be understood at least partly from their use in context. For example, depending at least partly on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood not necessarily to convey an exclusive set of factors, but rather, alternatively, depending at least partly on the context, to allow for the presence of other factors that are not necessarily explicitly described.

[0041] It is understood that the meanings of “on”, “above”, and “above” in this invention should be interpreted in the broadest manner, such that “on” means not only “directly on” something, but also includes the meaning of being “on” something with an intervening feature or layer, and that “above” or “above” means not only “on” something, but also includes the meaning of being “on” something without an intervening feature or layer.

[0042] Furthermore, spatially related terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein for convenience to describe the relationship of one element or feature to one or more other elements or features, as illustrated in the accompanying drawings. Spatially related terms are intended to cover different orientations in the use or operation of the device other than those depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially related descriptive terms used herein can be interpreted similarly.

[0043] like Figures 1 to 11As shown in the figure, this embodiment of the invention provides a hydraulic fracturing anti-channeling rod device for coal mines, including a sealing part 1. The sealing part 1 is a mechanical sealing and setting device commonly used in the art, as illustrated in the accompanying drawings. Figure 1 and Figure 11 To explain, the main principle is that when the packer setter is lowered into the wellbore, the guide pin (a rotatable pin, a key component in a mechanical packer setter) is at the top dead center of the reversing mechanism (equivalent to...). Figure 11 In region A of the middle track 15, after the column 11 is lowered into position, an axial force is applied to the packer setter to lift the column 11. The track pin inside the pin part 14 moves along the track 15. When the track pin moves to region C of the track 15, an axial force is applied to the packer setter to lower the column 11. The track pin inside the pin part 14 moves to the left from region C and enters the long slide of the track 15. Figure 11 In the area at point D in the middle track 15, the conical surface of the tubing string 11 contacts the slip part 13, and opens the slip part 13 to clamp the inner wall of the wellbore. At the same time, the rubber sleeve part 12 is compressed, causing the rubber sleeve to deform and expand radially, and then it fits tightly against the inner wall of the wellbore. The mechanical packer setter is a mature existing technology, and its specific detailed structure and matching relationship will not be described in this application. One end of the packer part 1 is rotatably connected to the connecting seat 3, and the other end of the packer part 1 is fixedly connected to the slag removal component 2. The inner tubing string 4 is rotatably connected inside the packer part 1, and one end of the inner tubing string 4 is fixedly connected to the connecting seat 3.

[0044] The slag removal assembly 2 includes a fixed base 21 fixed to one end of the sealing part 1, an annular pusher plate 22 fixed to the outer wall of the fixed base 21, a damping coupling 214 and a rotating part 24 rotatably connected inside the fixed base 21, and a plurality of swirl scraping parts 23 connected to one side of the rotating part 24. One side of the rotating part 24 is fixedly connected to one side of the damping coupling 214. The other end of the inner tube column 4 passes through the sealing part 1 and is fixedly connected to one side of the damping coupling 214. The outer surface of the swirl scraping part 23 includes a horizontal surface and an inclined surface, and a plurality of toothed flanges are integrally formed on both the horizontal surface and the inclined surface.

[0045] The fixing base 21 includes a connecting end 211 fixed to one end of the sealing part 1, a connecting end 212 fixed to the other side of the connecting end 211, and a damping member 213 connected between the connecting end 211 and the connecting end 212.

[0046] By adopting the above technical solution, before the packer 1 is lowered into the wellbore, it is usually connected to the packer 1 by a mechanical structure using a running tool. The running tool is connected to the drive system (which safely and accurately sends the tubing string deep into the wellbore and drives it to rotate when needed, mainly relying on the core system of the oil drilling rig or workover rig; including rotary table drive and top drive system, which are existing technologies in this field and will not be described in detail here). In this application, one end of the running tool is fixedly connected to the connecting seat 3, and the connection between the running tool and the connecting seat 3 must be sealed. After the packer 1 is lowered into the wellbore, when the packer 1 is about to reach the sealing area, the drive system drives the connecting seat 3 to rotate. The rotating connecting seat 3 drives the damping coupling 214 to rotate inside the fixed seat 21. The rotation of the damping coupling 214 drives the rotating part 24 and multiple scraping parts 23 connected to one side of the rotating part 24 to rotate. The multiple scraping parts 23 rotate to remove the mud cake on the inner wall of the well. While the fixed seat 21 moves inside the well, the mud cake that has been removed and fallen into the well is pushed and moved by the annular pusher plate 22. The scraping parts 23 clean the mud cake on the inner wall of the well. Before setting, the well is purified to provide a uniform and reliable contact surface for the rubber sealing ring, so that the rubber sleeve can directly contact the metal, the sealing stress is evenly distributed, and the reliability of the packer seal is guaranteed.

[0047] like Figures 6-9 As shown, the rotating part 24 includes a rotating disk 241 rotatably connected inside the connecting end 212 and a plurality of connecting parts 245 fixed to one side of the rotating disk 241. The other end of the plurality of connecting parts 245 is fixed to one side of the damping coupling 214, and the plurality of scraping parts 23 are rotatably connected to the other side of the rotating disk 241.

[0048] The rotating disk 241 is rotatably connected to a plurality of connecting posts 243, and a plurality of gears 242 are rotatably connected to one side of the rotating disk 241. One end of each of the connecting posts 243 is fixedly connected to a plurality of gears 242, and the other end is fixedly connected to a plurality of scraping parts 23. The connecting end 212 is provided with a tooth groove 244 that meshes with the plurality of gears 242, and the plurality of gears 242 are located inside the connecting end 212.

[0049] By adopting the above technical solution, when the damping coupling 214 rotates and drives the rotating disk 241 to rotate, the rotating disk 241 rotates inside the connecting end 212. The tooth groove 244 on the inner wall of the connecting end 212 drives the gear 242 to rotate. The rotation of the gear 242 drives the swivel scraper 23 to rotate through the connecting column 243. The swivel scraper 23 can rotate on one side of the rotating disk 241 while rotating with the rotating disk 241. The rotation of the swivel scraper 23, combined with its rotation, can generate local high-frequency impact, so that the tooth tip of the swivel scraper 23 can generate point load crushing on mud / rock chips, improving the removal efficiency of hard objects. At the same time, the rotation generates a centrifugal throwing effect, which can throw off the cut mud cake debris, avoid secondary adhesion to the swivel scraper 23, remove chips faster, and also distribute the wear of the swivel scraper 23 teeth, extending the overall service life.

[0050] like Figures 6-9 As shown, multiple feed grooves 231 are provided on the outer surface of the multiple scraping parts 23, and an inner cavity 232 communicating with the multiple feed grooves 231 is provided inside the multiple scraping parts 23. A discharge port 233 communicating with the inner cavity 232 is provided at one end of the multiple scraping parts 23.

[0051] The inner cavity 232 is rotatably connected to the auger 234, and both ends of the auger 234 are rotatably connected to the inner wall of the inner cavity 232. The damping coupling 214 is internally connected to the drive unit 25, and the drive unit 25 passes through the damping coupling 214, the gear 242 and the connecting column 243 and is fixedly connected to one end of the auger 234.

[0052] The drive unit 25 includes multiple movable slots 251 formed inside the damping coupling 214, multiple gears 252 rotatably connected inside the multiple movable slots 251, and multiple connecting rods 253 rotatably connected inside the multiple gears 242 and the connecting column 243. One end of the multiple connecting rods 253 passes through the damping coupling 214 and is fixedly connected to the gears 252, and the other end of the connecting rods 253 passes through the scraping part 23, enters the inner cavity 232, and is fixedly connected to one end of the auger 234. The connecting end 212 has a toothed groove 254 that meshes with the multiple gears 252.

[0053] By adopting the above technical solution, when the scraper 23 rotates and removes the mud cake on the inner wall of the well, the mud may adhere to the scraper 23. In addition to the centrifugal force generated by the rotation of the scraper 23 to throw out some mud, some mud will enter the inner cavity 232 from the feed chute 231, avoiding the situation of material accumulation and jamming caused by the low discharge efficiency of the scraper 23. When the damping coupling 214 and the rotating disk 241 rotate, the toothed groove 254 on the inner wall of the connecting end 212 can drive the gear 252 to rotate. The rotation of 252 drives the auger 234 in the inner cavity 232 to rotate via the connecting rod 253. The auger 234 transports the soil in the inner cavity 232 toward the discharge port 233, and then discharges it from the discharge port 233. This design can continuously transport the crushed soil that enters the inner cavity 232 forward (in the direction of the advance of the slag removal component 2), preventing it from getting stuck between the cutting teeth, ensuring that the cutting edge always has a sharp contact surface, reducing the eccentric vibration and sudden increase in cutting force caused by the accumulation of mud, and improving cutting stability.

[0054] like Figure 4 and Figure 10 As shown, a cleaning assembly 26 is also connected to one side of the rotating disk 241, and the cleaning assembly 26 includes a plurality of rotating columns 261 rotatably connected to one side of the rotating disk 241 and a plurality of cleaning flanges 262 fixed to the outside of the plurality of rotating columns 261. A plurality of gears 263 that mesh with the plurality of gears 242 are also rotatably connected to the other side of the rotating disk 241, and the plurality of gears 263 are fixed to the plurality of rotating columns 261 respectively.

[0055] By adopting the above technical solution, when the rotating disk 241 rotates and drives the gear 1 242 to rotate, the gear 1 242 can also drive the gear 3 263 to rotate. The rotation of the gear 3 263 drives the rotating column 261 to rotate. Through the multiple cleaning flanges 262 on the outside of the rotating column 261, the mud or soil stuck between two adjacent toothed flanges on the outside of the scraping part 23 can be scraped, thereby improving the cleaning efficiency of the scraping part 23.

[0056] like Figure 2 , Figure 4 and Figure 5 As shown, the inner tube column 4, the connecting seat 3, and the damping coupling 214 all have infusion channels 5 inside.

[0057] A nozzle 27 is fixedly connected to one side of the rotating disk 241, and a pipe 28 is fixedly connected to the liquid delivery channel 5 inside the damping coupling 214. One end of the pipe 28 is connected to the input end of the nozzle 27, and the spray end of the nozzle 27 faces the swirl scraper 23.

[0058] By adopting the above technical solution, the liquid is pumped into the infusion channel 5, and then enters the pipe 28 from the infusion channel 5. The liquid then enters the nozzle 27 from the pipe 28 and is discharged from the nozzle 27. The liquid discharged from the nozzle 27 is used to rinse the swirl scraper 23 and the cleaning flange 262, which can remove the dirt attached to their surfaces and improve the overall cleaning efficiency and effect.

[0059] The working process provided by this invention is as follows:

[0060] First, the perforating device is lowered into the wellbore and moved to the area requiring fracturing for perforation. Then, the perforating device is withdrawn from the wellbore, and this device is lowered into the wellbore. When the packer 1 is about to reach the packer area, the drive system drives the connecting seat 3 to rotate. The rotation of the connecting seat 3 drives the damping coupling 214 to rotate inside the fixed seat 21. The rotation of the damping coupling 214 drives the rotating disk 241 and multiple scraping parts 23 connected to one side of the rotating disk 241 to rotate. The rotating disk 241 rotates inside the connecting end 212. The toothed groove 244 on the inner wall of the connecting end 212 drives the gear 242 to rotate. The rotation of the gear 242 drives the scraping parts 23 to rotate through the connecting column 243, so that the scraping parts 23 can rotate on one side of the rotating disk 241 while rotating with the rotating disk 241. At the same time, the toothed groove 254 on the inner wall of the connecting end 212 can drive the gear 252 to rotate. The rotation of gear 252 drives the auger 234 in the inner cavity 232 to rotate via connecting rod 253. The auger 234 transports the soil in the inner cavity 232 toward the discharge port 233, and then discharges it from the discharge port 233. When the rotating disk 241 rotates and drives gear 1 242 to rotate, gear 1 242 can also drive gear 3 263 to rotate. The rotation of gear 3 263 drives the rotating column 261 to rotate. Multiple cleaning flanges 262 on the outside of the rotating column 261 can clean the mud or soil stuck between two adjacent toothed flanges on the outside of the swirl scraper 23, improving the cleaning efficiency of the swirl scraper 23. After cleaning the inner wall of the wellbore in the setting area, the sealing part 1 is controlled to set the well, and then fracturing fluid is pumped into the wellbore for fracturing. After fracturing is completed, the device is removed from the wellbore, and the perforating device is lowered into the wellbore again and the above steps are repeated.

[0061] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0062] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A hydraulic fracturing anti-channeling rod device for coal mines, characterized in that, It includes a sealing part, one end of which is rotatably connected to a connecting seat, and the other end of which is fixedly connected to a slag removal component. An inner tube column is rotatably connected inside the sealing part, and one end of the inner tube column is fixedly connected to the connecting seat. The slag removal assembly includes a fixed seat fixed to one end of the sealing part, an annular pusher plate fixed to the outer wall of the fixed seat, a damping coupling and a rotating part rotatably connected inside the fixed seat, and multiple scraping parts connected to one side of the rotating part. One side of the rotating part is fixedly connected to one side of the damping coupling, and the other end of the inner tube column is fixedly connected to one side of the damping coupling. The fixing base includes a connecting end one fixed to one end of the sealing part, a connecting end two fixed to the other side of the connecting end one, and a damping element connected between the connecting end one and the connecting end two.

2. The anti-channeling rod device for hydraulic fracturing in coal mines according to claim 1, characterized in that, The rotating part includes a rotating disk rotatably connected inside the connecting end two and a plurality of connecting parts fixed to one side of the rotating disk. The other end of the plurality of connecting parts is fixed to one side of the damping coupling, and the plurality of scraping parts are rotatably connected to the other side of the rotating disk.

3. The anti-channeling rod device for hydraulic fracturing in coal mines according to claim 2, characterized in that, The rotating disk is rotatably connected to multiple connecting columns, and multiple gears are rotatably connected to one side of the rotating disk. One end of each of the multiple connecting columns is fixedly connected to multiple gears, and the other end is fixedly connected to multiple scraping parts. The connecting end two has a tooth groove that meshes with multiple gears, and the multiple gears are located inside the connecting end two.

4. The anti-channeling rod device for hydraulic fracturing in coal mines according to claim 3, characterized in that, The outer surface of the scraping part includes a horizontal surface and an inclined surface, and multiple toothed flanges are integrally formed on both the horizontal surface and the inclined surface.

5. The anti-channeling rod device for hydraulic fracturing in coal mines according to claim 1, characterized in that, Multiple feed grooves are provided on the outer surface of the multiple scraping parts, and an inner cavity is provided inside the multiple scraping parts that communicates with the multiple feed grooves. A discharge port is provided at one end of the multiple scraping parts that communicates with the inner cavity.

6. The anti-channeling rod device for hydraulic fracturing in coal mines according to claim 5, characterized in that, The inner cavity is rotatably connected to an auger, and both ends of the auger are rotatably connected to the inner wall of the cavity. The damping coupling is internally connected to a drive unit, and the drive unit passes through the damping coupling, gear one, and connecting column and is fixedly connected to one end of the auger.

7. The anti-channeling rod device for hydraulic fracturing in coal mines according to claim 6, characterized in that, The drive unit includes multiple movable slots opened inside the damping coupling, multiple gears 2 respectively rotatably connected inside the multiple movable slots, and multiple connecting rods respectively rotatably connected inside the multiple gears 1 and the connecting column. One end of the multiple connecting rods passes through the damping coupling and is fixedly connected to the gear 2, and the other end of the connecting rod passes through the scraping part into the inner cavity and is fixedly connected to one end of the auger. The connecting end 2 has a toothed groove 2 that meshes with the multiple gears 2 inside.

8. The anti-channeling rod device for hydraulic fracturing in coal mines according to claim 7, characterized in that, A cleaning assembly is also connected to one side of the rotating disk, and the cleaning assembly includes multiple rotating columns rotatably connected to one side of the rotating disk and multiple cleaning flanges fixed to the outside of the multiple rotating columns. A multiple gear three is rotatably connected to the other side of the rotating disk, and the multiple gear three are fixed to the multiple rotating columns respectively.

9. The anti-channeling rod device for hydraulic fracturing in coal mines according to claim 8, characterized in that, The inner tubular column, connecting seat, and damping coupling all have fluid delivery channels inside.

10. The anti-channeling rod device for hydraulic fracturing in coal mines according to claim 9, characterized in that, A nozzle is fixedly connected to one side of the rotating disk, and a pipe is fixedly connected to the liquid delivery channel inside the damping coupling. One end of the pipe is connected to the input end of the nozzle, and the spraying end of the nozzle faces the swirl scraper.

Images