Hydraulic push type mechanical double-blade reamer

Abstract

The utility model discloses a hydraulic propulsion type mechanical double-blade reamer which comprises a hydraulic propulsion assembly, a rod body assembly and a reaming assembly. According to the utility model, the reaming assembly is driven to perform corresponding opening action under the action of the hydraulic propelling assembly, so that reaming operation can be realized after drilling; the hydraulic propulsion assembly comprises a hollow piston rod core and a piston, the piston is fixedly arranged on a rod body of the hollow piston rod core in a sleeving mode, two liquid inlet cavities are formed in the rod wall of the hollow piston rod core, and the push rod is pushed to move synchronously through movement of the hollow piston rod core; the broaching core rod can be driven to move along with movement of the push rod, the cutter wings can be driven to rotate relative to the cutter wing shell under the meshing action of the gear and the tooth grooves, then unfolding or folding of the cutter wings is achieved, and when the cutter wings are in the unfolding state, the broaching operation of a drill hole can be achieved by rotating the broaching device. A hydraulic mechanical core rod is used for pushing the reaming blades to open and close, an external high-pressure pump station is not needed, and operation and use are convenient.

Description

Technical Field

[0001] The utility model relates to a double - blade reamer, in particular to a hydraulic - propulsion mechanical double - blade reamer, belonging to the technical field of coal seam drilling. Background Technique

[0002] Currently, during the deep - hole drilling of coal seams, due to the soft coal quality, the hole wall is prone to collapse. Single - hole drilling requires multiple drilling operations, consuming manpower and material resources, affecting work efficiency. In addition, the collapse of the hole wall seriously affects the gas drainage efficiency, which is a common problem faced by high - gas soft coal mines. By using the method of mechanical cavity formation, special reamers are used to create cavities or holes in the coal seam to improve the gas permeability of the coal seam, increase the gas extraction efficiency, reduce the gas concentration, thereby reducing the risk of gas explosion and ensuring the safety of the mine.

[0003] In the prior art, as disclosed in a double - blade reamer for coal mines with the publication number CN216406705U, it includes an outer tube. The two ends of the outer tube are respectively connected with a first connecting tube and a second connecting tube. A first sleeve is sleeved at the connection between the outer tube and the first connecting tube. A pressure - receiving block is slidably connected inside the first sleeve. A second sleeve is sleeved at the connection between the outer tube and the second connecting tube. A valve block is slidably connected inside the second sleeve. A slide rod is slidably connected inside the outer tube. A reaming cutter is rotatably connected to the side wall of the outer tube. A push rod is arranged inside the second connecting tube. A first spring is sleeved on the push rod. When high - pressure water is introduced, the slide rod will drive the reaming cutter to rotate outward and expand, enabling the device to perform reaming operations. After the reaming operation is completed, when the water pressure is reduced, through the elastic force of the first spring, the slider is prompted to drive the reaming cutter to rotate reversely and retract into the inside of the outer tube, improving the efficiency of drilling and reaming. However, in actual use, the existing reamer needs high - pressure water to realize the expansion of the reaming cutter. Therefore, a special high - pressure water pump station needs to be equipped during use, that is, high - pressure water needs to be provided by a high - pressure water pump each time to cooperate to realize the expansion of the reaming cutter, which is inconvenient to operate. And continuous high - pressure water supply is required to keep the reaming cutter in the expanded state all the time. Once the pressure value of the supplied high - pressure water changes, it will directly affect the expansion amplitude of the reaming cutter, and then affect the actual reaming effect, which is not conducive to the smooth progress of reaming construction. Summary of the Invention

[0004] The purpose of the utility model is to provide a hydraulic - propulsion mechanical double - blade reamer to solve at least one of the above - mentioned technical problems.

[0005] The utility model realizes the above - mentioned purpose through the following technical solutions: A hydraulic - propulsion mechanical double - blade reamer includes a hydraulic propulsion component, a rod body component, and a reaming component. The hydraulic propulsion component, the rod body component, and the reaming component are sequentially connected in a straight line;

[0006] The hydraulic propulsion assembly includes a hollow piston rod core and a piston. The piston is fixedly sleeved on the rod body of the hollow piston rod core. A large housing is arranged outside the piston. Two liquid inlet cavities are formed in the rod wall of the hollow piston rod core, and the liquid inlet cavities communicate with the cavity inside the large housing. The positions where the two liquid inlet cavities communicate with the cavity of the large housing are respectively located on the front and rear sides of the piston.

[0007] The rod body assembly includes a drill pipe and a push rod. A drill pipe cavity is formed inside the drill pipe. The push rod is movably inserted into the drill pipe cavity, and the push rod is coaxially connected with the hollow piston rod core.

[0008] The hole expanding assembly includes a hole expanding core rod, a cutter wing housing and cutter wings. The hole expanding core rod is coaxially connected with the push rod. The hole expanding core rod is movably inserted into the cutter wing housing. Cutter wings are movably connected to the cutter wing housing, and the cutter wings are respectively located on both sides of the hole expanding core rod. A gear is arranged at the inner end of the cutter wing. Tooth grooves are formed on both sides of the rod body of the hole expanding core rod, and the gears at the inner ends of the cutter wings are meshed with the tooth grooves.

[0009] As a further scheme of the present utility model: A small housing is sleeved outside the rod body of the hollow piston rod core. A front small end cover is arranged at the front end of the small housing, and a rear small end cover is arranged at the rear end of the small housing. A front large end cover is arranged at the front end of the large housing, and a rear large end cover is arranged at the rear end of the large housing. A plurality of screws are connected between the small housing and the end covers at both ends, and a plurality of screws are connected between the large housing and the end covers at both ends.

[0010] As a further scheme of the present utility model: Two liquid injection joints are communicated with the outer wall of the shell body of the small housing. Two liquid guiding annular grooves are formed on the inner wall of the shell body of the small housing. The liquid injection joints and the liquid guiding annular grooves are arranged in one-to-one correspondence, and the liquid guiding annular grooves are respectively arranged in a ring shape at the liquid inlet openings of the two liquid inlet cavities formed in the rod wall of the hollow piston rod core. A deep groove ball bearing and a rotary shaft seal are arranged between the inner wall of the small housing and the rod body of the hollow piston rod core. The deep groove ball bearings are respectively located at both ends of the inner wall of the small housing, and the rotary shaft seals are respectively located on both sides of the positions where the liquid guiding annular grooves are formed. Sealing rings are sleeved at the connecting parts of the front large end cover and the rear large end cover on the rod body of the hollow piston rod core, and a sealing ring is arranged between the large housing and the piston.

[0011] As a further scheme of the present utility model: A water passing device is arranged between the hollow piston rod core and the push rod. A connecting cone is sleeved outside the water passing device. One end of the connecting cone is connected with the rear large end cover, and the other end of the connecting cone is inserted and connected with the drill pipe.

[0012] As a further solution of the present utility model: The rod body assembly further includes a limit ring, a pushing spring and a guiding ring. The guiding ring is movably sleeved on the rod body of the push rod on the side close to the hydraulic propulsion assembly, and the guiding ring is clamped in the drill pipe cavity. A limit ring is fixedly arranged on the rod body of the drill pipe on the side close to the reaming assembly, and a pushing spring is sleeved on the rod body of the drill pipe close to one end of the reaming assembly. The pushing spring abuts against the step surface of the drill pipe cavity.

[0013] As a further solution of the present utility model: The reaming assembly further includes a gland, a connecting shell and a conical head. The gland, the cutter wing shell, the connecting shell and the conical head are connected in sequence along a straight line, and the gland, the reaming core rod, the connecting shell and the conical head form the external shell structure of the reaming assembly. A core rod seat is integrally connected to the rod body of the reaming core rod, and the core rod seat is movably clamped in the cutter wing shell.

[0014] As a further solution of the present utility model: A through cutter wing moving cavity is opened on the shell body of the cutter wing shell. A pin shaft is arranged in the cutter wing moving cavity. The cutter wing is movably connected in the cutter wing moving cavity through the pin shaft. A plurality of reaming bits are embedded and connected to the wing body of the cutter wing.

[0015] As a further solution of the present utility model: A reaming spring is arranged in the connecting shell. One end of the reaming spring is sleeved on the front end of the reaming core rod, and the other end of the reaming spring is clamped at the stepped surface of the connecting shell.

[0016] As a further solution of the present utility model: A water guiding cavity is penetrated and opened in the reaming core rod, and a water outlet cavity is opened in the conical head. The water guiding cavity is communicated with the water outlet cavity.

[0017] The beneficial effects of the present utility model are as follows: By providing a hydraulic propulsion assembly, a rod body assembly and a reaming assembly, the reaming assembly can be driven to perform corresponding opening actions through the action of the hydraulic propulsion assembly, so that the reaming operation can be realized after drilling. The hydraulic propulsion assembly includes a hollow piston rod core and a piston. The piston is fixedly sleeved on the rod body of the hollow piston rod core. Two liquid inlet cavities are opened on the rod wall of the hollow piston rod core. The piston can be moved back and forth in the cavity of the large shell by injecting hydraulic liquid into one of the liquid inlet cavities and outputting hydraulic liquid from the other liquid inlet cavity, so as to drive the hollow piston rod core to move. Through the movement of the hollow piston rod core, the push rod is driven to move synchronously. Through the movement of the push rod, the reaming core rod can be driven to move accordingly. Then, under the meshing action of the gear and the tooth groove, the cutter wing can be driven to rotate relative to the cutter wing shell, so as to realize the unfolding or retraction of the cutter wing. And when the cutter wing is in the unfolded state, rotating the reamer can realize the reaming operation of the drill hole. The hydraulic mechanical core rod is used to push the reaming cutter wing to open and close, without an external high-pressure pumping station, which is convenient for operation and use. Description of the Drawings

[0018] Figure 1Schematic diagram of the overall structure of the present utility model;

[0019] Figure 2 Schematic diagram of the overall sectional structure of the present utility model;

[0020] Figure 3 Schematic diagram of the external structure of the hydraulic propulsion component of the present utility model;

[0021] Figure 4 Schematic diagram of the sectional structure of the hydraulic propulsion component of the present utility model;

[0022] Figure 5 Schematic diagram of the sectional structure of the rod assembly of the present utility model;

[0023] Figure 6 Schematic diagram of the push rod structure of the present utility model;

[0024] Figure 7 Schematic diagram of the external structure of the hole expanding component of the present utility model;

[0025] Figure 8 Schematic diagram of the sectional structure of the hole expanding component of the present utility model;

[0026] Figure 9 Schematic diagram of the hole expanding core rod of the present utility model.

[0027] In the figure: 1. Hydraulic propulsion component, 11. Hollow piston rod core, 12. Front small end cover, 13. Small housing, 14. Rear small end cover, 15. Front large end cover, 16. Large housing, 17. Rear large end cover, 18. Piston, 19. Liquid injection joint, 110. Connecting cone, 111. Water passage device, 112. Deep groove ball bearing, 113. Screw, 114. Rotary shaft seal, 115. Liquid inlet cavity, 116. Sealing ring, 117. Liquid guiding annular groove, 2. Rod assembly, 21. Drill pipe, 22. Push rod, 23. Drill pipe cavity, 24. Limit ring, 25. Push spring, 26. Guide ring, 3. Hole expanding component, 31. Gland, 32. Hole expanding core rod, 33. Blade housing, 34. Blade, 35. Hole expanding spring, 36. Connecting housing, 37. Cone head, 38. Blade moving cavity, 39. Pin shaft, 310. Hole expanding drill bit, 311. Water guiding cavity, 312. Water outlet cavity, 313. Core rod seat, 314. Tooth groove. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0029] Example 1, as Figures 1 to 9 shown, a hydraulic propulsion type mechanical double - blade reamer, comprising a hydraulic propulsion assembly 1, a rod body assembly 2 and a reaming assembly 3. The hydraulic propulsion assembly 1, the rod body assembly 2 and the reaming assembly 3 are connected in a straight line in sequence. The action of the hydraulic propulsion assembly 1 can drive the reaming assembly 3 to perform corresponding opening actions, and thus the reaming operation can be realized after drilling;

[0030] The hydraulic propulsion assembly 1 includes a hollow piston rod core 11 and a piston 18. The piston 18 is fixedly sleeved on the rod body of the hollow piston rod core 11. A large housing 16 is arranged outside the piston 18. Two liquid inlet cavities 115 are formed in the rod wall of the hollow piston rod core 11. The liquid inlet cavities 115 communicate with the cavity in the large housing 16, and the positions where the two liquid inlet cavities 115 communicate with the cavity of the large housing 16 are respectively located on the front and rear sides of the piston 18. By injecting hydraulic liquid into one of the liquid inlet cavities 115 and outputting hydraulic liquid from the other liquid inlet cavity 115, the piston 18 can move back and forth in the cavity of the large housing 16, and then the hollow piston rod core 11 can be driven to move;

[0031] The rod body assembly 2 includes a drill rod 21 and a push rod 22. A drill rod cavity 23 is formed inside the drill rod 21. The push rod 22 is movably inserted into the drill rod cavity 23, and the push rod 22 is coaxially connected with the hollow piston rod core 11, so that the movement of the hollow piston rod core 11 can push the push rod 22 to move synchronously;

[0032] The reaming assembly 3 includes a reaming core rod 32, a cutter wing housing 33 and cutter wings 34. The reaming core rod 32 is coaxially connected with the push rod 22. The reaming core rod 32 is movably inserted into the cutter wing housing 33. The cutter wings 34 are movably connected to the cutter wing housing 33, and the cutter wings 34 are respectively located on both sides of the reaming core rod 32. Gears are arranged at the inner ends of the cutter wings 34. Tooth grooves 314 are formed on both sides of the rod body of the reaming core rod 32, and the gears at the inner ends of the cutter wings 34 are meshed with the tooth grooves 314. The movement of the push rod 22 can drive the reaming core rod 32 to move accordingly, and then the cutter wings 34 can be driven to rotate relative to the cutter wing housing 33 under the meshing action of the gears and the tooth grooves 314, and thus the expansion or retraction of the cutter wings 34 can be realized. When the cutter wings 34 are in the expanded state, rotating the reamer can realize the reaming operation of the drill hole.

[0033] Embodiment 2. In addition to all the technical features of Embodiment 1, this embodiment also includes: a small shell 13 is sleeved on the outer side of the rod body of the hollow piston rod core 11, a front small end cover 12 is provided at the front end of the small shell 13, a rear small end cover 14 is provided at the rear end of the small shell 13, a front large end cover 15 is provided at the front end of the large shell 16, a rear large end cover 17 is provided at the rear end of the large shell 16, a plurality of screws 113 are connected between the small shell 13 and the front and rear end end covers, and a plurality of screws 113 are connected between the large shell 16 and the front and rear end end covers, so that the small shell 13 can be assembled and connected to the rod body of the hollow piston rod core 11, and the large shell 16 can be assembled and connected to the outer side of the piston 18, so as to form the outer shell structure of the hydraulic propulsion component 1.

[0034] Furthermore, the outer wall of the shell body of the small shell body 13 is connected to two liquid injection joints 19, and the inner wall of the shell body of the small shell body 13 is provided with two liquid guide annular grooves 117. The liquid injection joints 19 and the liquid guide annular grooves 117 are arranged one by one, and the liquid guide annular grooves 117 are respectively arranged in a ring shape at the liquid inlet of the two liquid inlet cavities 115 opened on the rod wall of the hollow piston rod core 11. A deep groove ball bearing 112 and a rotating step seal 114 are arranged between the inner wall of the small shell body 13 and the rod body of the hollow piston rod core 11, and the deep groove ball bearings 112 are respectively located at the two ends of the inner wall of the small shell body 13, and the rotating step seal 114 is respectively located on both sides of the position where the liquid guide annular groove 117 is opened. The front large end cover 15 and the rear large end cover 17 are provided with sealing rings 116 at the rod body connection position of the hollow piston rod core 11, and the large shell body 16 and the piston A sealing ring 116 is arranged between 18, so that the small housing 13 can rotate relative to the hollow piston rod core 11 through the deep groove ball bearing 112, and when the hydraulic liquid is injected, the hydraulic liquid can be injected into the liquid guide annular groove 117 through the liquid injection joint 19, and the hydraulic liquid in the liquid guide annular groove 117 can enter the corresponding liquid inlet cavity 115, and when the hydraulic liquid is output, the path is exactly the opposite, so that when it is in a rotating state, it can also ensure that the hydraulic liquid is smoothly injected or output, so as to realize the hydraulic propulsion type hole expansion operation, and the sealing ring 116 arranged can ensure the sealing of the connection between the rod body of the hollow piston rod core 11 and the front large end cover 15 and the rear large end cover 17, and can ensure the sealing of the connection between the large housing 16 and the piston 18, so as to ensure smooth hydraulic propulsion.

[0035] Furthermore, a water filter 111 is provided between the hollow piston rod core 11 and the push rod 22, and a connecting cone 110 is sleeved on the outer side of the water filter 111. One end of the connecting cone 110 is connected to the rear large end cover 17, and the other end of the connecting cone 110 is inserted and connected to the drill rod 21. The water injected into the hollow inner cavity of the hollow piston rod core 11 can enter the drill rod cavity 23 of the drill rod 21 through the water filter 111, and the hydraulic propulsion assembly 1 and the rod body assembly 2 are aligned and connected through the connecting cone 110.

[0036] Example 3. In addition to all the technical features included in Example 1, this example further includes: The rod body assembly 2 further includes a limit ring 24, a pushing spring 25, and a guiding ring 26. The guiding ring 26 is movably sleeved on the rod body of the push rod 22 close to the hydraulic propulsion assembly 1, and the guiding ring 26 is clamped in the drill pipe cavity 23. A limit ring 24 is fixedly arranged on the rod body of the drill pipe 21 close to the reaming assembly 3, and a pushing spring 25 is sleeved on the rod body of the drill pipe 21 close to one end of the reaming assembly 3. The pushing spring 25 abuts against the step surface of the drill pipe cavity 23. The arranged guiding ring 26 can ensure that the push rod 22 can move along a straight line, and the arranged pushing spring 25 can be compressed to generate elastic force when the push rod 22 is pushed forward. Furthermore, when the hydraulic propulsion force is removed, the push rod 22 can return to its original state under the action of the elastic force.

[0037] The reaming assembly 3 further includes a gland 31, a connecting housing 36, and a cone head 37. The gland 31, the blade housing 33, the connecting housing 36, and the cone head 37 are connected in sequence along a straight line, and the gland 31, the reaming core rod 32, the connecting housing 36, and the cone head 37 constitute the outer housing structure of the reaming assembly 3. An integral core rod seat 313 is connected to the rod body of the reaming core rod 32, and the core rod seat 313 is movably clamped in the blade housing 33 to ensure that the reaming core rod 32 can move along a straight line.

[0038] Furthermore, a through blade moving cavity 38 is formed in the housing of the blade housing 33. A pin shaft 39 is arranged in the blade moving cavity 38. The blade 34 is movably connected in the blade moving cavity 38 through the pin shaft 39. A plurality of reaming bits 310 are embedded and connected to the blade body of the blade 34. The arranged blade moving cavity 38 can realize the hidden connection of the blade 34, thus facilitating the drilling operation. At the same time, when the blade 34 is unfolded for reaming operation, the arranged reaming bits 310 can improve the reaming efficiency.

[0039] Further, a reaming spring 35 is arranged in the connecting housing 36. One end of the reaming spring 35 is sleeved on the front end of the reaming core rod 32, and the other end of the reaming spring 35 is clamped at the stepped surface of the connecting housing 36. When the reaming core rod 32 moves forward under the action of hydraulic propulsion, the reaming spring 35 can be compressed while the blade 34 is unfolded. Furthermore, when the hydraulic propulsion force is removed, the reaming core rod 32 can return to its original state under the action of the elastic force, that is, the blade 34 can be retracted.

[0040] Furthermore, a water guiding chamber 311 is formed through the reaming core rod 32, and a water outlet chamber 312 is formed in the cone head 37. The water guiding chamber 311 is communicated with the water outlet chamber 312 so as to cooperate with the hollow piston rod core 11, the water passer 111 and the drill rod chamber 23 to realize the transport of water from the tail end of the reamer to the front. Thus, while the reaming operation is being performed, the reamer can also spray water, that is, can spray pressurized water to act on the hole position of the reaming hole to further improve the reaming efficiency.

[0041] The rod wall of the hollow piston rod core 11 is provided with two liquid inlet chambers 115, which are connected with the cavity in the large shell 16, and the two liquid inlet chambers 115 are connected with the cavity of the large shell 16 at the front and rear sides of the piston 18, respectively. By injecting hydraulic liquid into one of the liquid inlet chambers 115 and outputting hydraulic liquid from the other liquid inlet chamber 115, the piston 18 can be moved forward and backward in the cavity of the large shell 16, thereby driving the hollow piston rod core 11 to move; the push rod 22 is coaxially connected to the hollow piston rod core 11 so that the push rod 22 can be pushed to move synchronously through the movement of the hollow piston rod core 11; the movement of the push rod 22 can drive the reaming core rod 32 to move accordingly, and then the blade wing 34 can be driven to rotate relative to the blade wing shell 33 under the meshing action of the gear and the tooth groove 314, thereby realizing the expansion or retraction of the blade wing 34, and when the blade wing 34 is in the expanded state, the reamer can be rotated to realize the reaming operation of the drilled hole.

[0042] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0043] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A hydraulic propulsion type mechanical double - cutter reamer, comprising a hydraulic propulsion assembly (1), a rod body assembly (2) and a reaming assembly (3), characterized in that: The hydraulic propulsion assembly (1), the rod body assembly (2) and the reaming assembly (3) are sequentially connected in a straight line; The hydraulic propulsion assembly (1) includes a hollow piston rod core (11) and a piston (18). The piston (18) is fixedly sleeved on the rod body of the hollow piston rod core (11). A large housing (16) is arranged outside the piston (18). Two liquid inlet cavities (115) are formed in the rod wall of the hollow piston rod core (11). The liquid inlet cavities (115) communicate with the cavity in the large housing (16). The positions where the two liquid inlet cavities (115) communicate with the cavity of the large housing (16) are respectively located on the front and rear sides of the piston (18); The rod body assembly (2) includes a drill pipe (21) and a push rod (22). A drill pipe cavity (23) is formed in the rod of the drill pipe (21). The push rod (22) is movably inserted into the drill pipe cavity (23), and the push rod (22) is coaxially connected with the hollow piston rod core (11); The reaming assembly (3) includes a reaming core rod (32), a cutter wing housing (33) and cutter wings (34). The reaming core rod (32) is coaxially connected with the push rod (22). The reaming core rod (32) is movably inserted into the cutter wing housing (33). The cutter wing housing (33) is movably connected with the cutter wings (34), and the cutter wings (34) are respectively located on both sides of the reaming core rod (32). Gears are arranged at the inner ends of the cutter wings (34). Tooth grooves (314) are formed on both sides of the rod body of the reaming core rod (32), and the gears at the inner ends of the cutter wings (34) are meshed with the tooth grooves (314).

2. The hydraulic propulsion mechanical double - blade reamer according to claim 1, characterized in that: A small housing (13) is sleeved outside the rod body of the hollow piston rod core (11). A front small end cover (12) is arranged at the front end of the small housing (13), and a rear small end cover (14) is arranged at the rear end of the small housing (13). A front large end cover (15) is arranged at the front end of the large housing (16), and a rear large end cover (17) is arranged at the rear end of the large housing (16). A plurality of screws (113) are connected between the small housing (13) and the end covers at the front and rear ends, and a plurality of screws (113) are connected between the large housing (16) and the end covers at the front and rear ends.

3. The hydraulic propulsion mechanical double-edge reamer according to claim 2, characterized in that: Two liquid injection joints (19) are communicated with the outer wall of the shell body of the small shell (13). Two liquid guiding annular grooves (117) are formed in the inner wall of the shell body of the small shell (13). The liquid injection joints (19) and the liquid guiding annular grooves (117) are arranged in one-to-one correspondence. The liquid guiding annular grooves (117) are respectively arranged in a ring shape at the liquid inlet ports of two liquid inlet cavities (115) formed in the rod wall of the hollow piston rod core (11). A deep groove ball bearing (112) and a rotary shaft seal (114) are arranged between the inner wall of the small shell (13) and the rod body of the hollow piston rod core (11). The deep groove ball bearings (112) are respectively located at both ends of the inner wall of the small shell (13). The rotary shaft seals (114) are respectively located on both sides of the positions where the liquid guiding annular grooves (117) are formed. Sealing rings (116) are sleeved at the connecting parts of the front large end cover (15) and the rear large end cover (17) on the rod body of the hollow piston rod core (11). A sealing ring (116) is arranged between the large shell (16) and the piston (18).

4. The hydraulic propulsion mechanical double-edge reamer according to claim 3, wherein: A water passing device (111) is arranged between the hollow piston rod core (11) and the push rod (22). A connecting cone (110) is sleeved outside the water passing device (111). One end of the connecting cone (110) is connected with the rear large end cover (17). The other end of the connecting cone (110) is inserted and connected with the drill pipe (21).

5. The hydraulic propulsion type mechanical double cutter reamer according to claim 1, characterized in that: The rod body assembly (2) further includes a limit ring (24), a pushing spring (25) and a guiding ring (26). The guiding ring (26) is movably sleeved on the rod body of the push rod (22) on the side close to the hydraulic propulsion assembly (1). The guiding ring (26) is clamped in the drill pipe cavity (23). A limit ring (24) is fixedly arranged on the rod body of the drill pipe (21) on the side close to the reaming assembly (3). A pushing spring (25) is sleeved on the rod body of the drill pipe (21) close to one end of the reaming assembly (3). The pushing spring (25) abuts against the step surface of the drill pipe cavity (23).

6. The hydraulic propulsion mechanical double - cutter reamer according to claim 1, characterized in that: The reaming assembly (3) further includes a gland (31), a connecting shell (36) and a cone head (37). The gland (31), the cutter wing shell (33), the connecting shell (36) and the cone head (37) are connected in sequence along a straight line. The gland (31), the reaming core rod (32), the connecting shell (36) and the cone head (37) form the external shell structure of the reaming assembly (3). A core rod seat (313) is integrally connected to the rod body of the reaming core rod (32). The core rod seat (313) is movably clamped in the cutter wing shell (33).

7. The hydraulic propulsion type mechanical double cutter reamer according to claim 1, characterized in that: A through cutter wing moving cavity (38) is formed in the shell body of the cutter wing shell (33). A pin shaft (39) is arranged in the cutter wing moving cavity (38). The cutter wing (34) is movably connected in the cutter wing moving cavity (38) through the pin shaft (39). A plurality of reaming bits (310) are embedded and connected to the wing body of the cutter wing (34).

8. The hydraulic propulsion mechanical double-edge reamer according to claim 7, wherein: A reaming spring (35) is arranged inside the connecting housing (36). One end of the reaming spring (35) is sleeved on the front end of the reaming mandrel (32), and the other end of the reaming spring (35) is placed at the stepped surface of the connecting housing (36).

9. The hydraulic propulsion type mechanical double cutter reamer according to claim 1, characterized in that: A water guiding cavity (311) is penetrated and formed inside the reaming mandrel (32), and a water outlet cavity (312) is formed inside the conical head (37). The water guiding cavity (311) is communicated with the water outlet cavity (312).

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