Hydraulic underreaming drill bit

Abstract

The utility model discloses a hydraulic underreaming drill bit, which belongs to the technical field of reaming equipment and comprises a barrel and at least one reaming wing, a vertical pressure oil cylinder is arranged at the top in the barrel and is connected with the reaming wing through a force transmission connecting rod, the two ends of the force transmission connecting rod are hinged to the pressure oil cylinder and the reaming wing respectively. The fixed supporting hinge points on the reaming wings are rotatably connected with the fixed hinge points on the cylinder body; and the cylinder body is provided with a bottom-expanding soil-holding window which is used for the hole-expanding wings to pass through and is used for the cut soil body to enter the cylinder body. According to the utility model, the connection points with fixed positions are arranged, so that the reaming wings are reliably ensured to be easily opened during reaming and effectively closed after containing soil, the working efficiency of bottom reaming is improved, and the failure rate and accident rate of bottom reaming construction are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a reaming device technical field, especially point to a kind of hydraulic bottom expander. BACKGROUND

[0002] Bottom expander is used for rotary drilling construction bored pile, generally by bottom expansion wing, pressurizing frame, connecting rod, base and pin shaft. Bottom expansion wing has two wings, three wings or four wings, etc., when the drilling machine rotates, bottom expansion wing gradually opens under the action of drilling tool weight or hydraulic pressure, and the hole wall is cut to expand bottom.

[0003] Bottom expansion wing opens and closes very frequently, and the bottom expansion wing opens when reaming, and closes after filling with soil. The structure of the existing bottom expander is prone to jamming during use, which makes it difficult to effectively open or close the bottom expansion wing, affecting the bottom expansion efficiency and causing hole accidents.

[0004] For example, Chinese patent document CN218509416U discloses a barrel type hydraulic cleaning and expanding integrated drill bit. The reaming wing does not have a fixed connection force point with the external barrel during opening and closing, resulting in a very small left and right component force formed during use, which reduces the feed amount. Due to the movement of the soil during the bottom expansion process and the overfilling of the soil, the reaming wing may not be effectively closed. UTILITY MODEL CONTENT

[0005] The utility model provides a kind of hydraulic bottom expander, which realizes the effective and reliable opening and closing of reaming wing.

[0006] The utility model provides the following technical solutions:

[0007] A hydraulic bottom expander includes a barrel and at least one reaming wing. A vertical pressure cylinder is provided at the top of the barrel. The pressure cylinder is connected to the reaming wing through a force transmission connecting rod. The two ends of the force transmission connecting rod are hingedly connected to the pressure cylinder and the reaming wing, respectively. A fixed support hinge point on the reaming wing is rotatably connected to a fixed hinge point on the barrel. A bottom expansion soil pocket window is provided on the barrel for the reaming wing to pass through and for the cut soil to enter the barrel.

[0008] Further, a corresponding reaming wing fixed hinge is fixedly provided on the fixed hinge point inside the barrel. The reaming wing fixed hinge is connected to the fixed support hinge point on the reaming wing. The reaming wing can rotate relative to the reaming wing fixed hinge.

[0009] Further, the reaming wing fixing hinge is arranged perpendicularly to the plane of the reaming wing, and the reaming wing fixing hinge passes through the reaming wing from a fixing support hinge point on the reaming wing, and two ends of the reaming wing fixing hinge are fixed in the cylinder side wall on both sides of the plane of the reaming wing.

[0010] Further, the axis of the pressure oil cylinder and the axis of the force transmission connecting rod have a set included angle.

[0011] Further, the cylinder is provided with an arc-shaped guide rail, and the reaming wing is provided with a guide roller, which is arranged in the guide rail and can move along the guide rail.

[0012] Further, the cylinder side wall has an inwardly recessed structure, forming a vertically arranged plane portion, and the guide rail is arranged on the plane portion, and the reaming wing is fixedly connected with a horizontal pin shaft, and the guide roller is rotatably sleeved on the pin shaft.

[0013] Further, the hinge point of the force transmission connecting rod and the reaming wing is located in the inner side of the upper portion of the reaming wing, the fixing support hinge point on the reaming wing is located in the outer side of the upper portion of the reaming wing, and the position of the guide roller arranged on the reaming wing is located below the hinge point of the force transmission connecting rod and the reaming wing and below the fixing support hinge point on the reaming wing.

[0014] Further, the reaming wing comprises a reaming wing panel and a cutting tool, and the ground-facing surface of the reaming wing panel and the ground-facing surface of the cutting tool have a set angle included angle, and the set angle is in the range of 120°-150°.

[0015] Further, the reaming wing further comprises a cutting tool plate, which is installed at the outer side and the bottom side edge of the reaming wing panel, and the ground-facing surface of the reaming wing panel and the ground-facing surface of the cutting tool plate have the set angle included angle, and the cutting tool is installed on the cutting tool plate.

[0016] Further, the cylinder bottom is provided with a hole cleaning bottom plate, the hole cleaning bottom plate is provided with a soil scraping window, and the soil scraping window is provided with an inclined scraper for scraping the soil below the hole cleaning bottom plate into the cylinder through the soil scraping window.

[0017] Further, the hole cleaning bottom plate is hinged to the side wall of the barrel, and a hanging part is arranged on the inner wall of the hole cleaning bottom plate; a vertical pressure rod mechanism is arranged on the top plate of the barrel, the pressure rod mechanism penetrates the top plate downward into the barrel, a hook matched with the hanging part is connected to the bottom end of the pressure rod mechanism, the hook is unhooked from the hanging part under the downward pressure of the pressure rod mechanism, and the hook is hung with the hanging part under the resetting action of a resetting spring arranged on the pressure rod mechanism.

[0018] Further, a connecting flange is fixedly arranged above the top plate of the barrel, and a vertical torque transmission baffle is fixedly arranged inside the barrel below the top plate of the barrel, the torque transmission baffle is arranged vertically to the plane of the hole expanding wing, a torque transmission groove is arranged on the torque transmission baffle, and the upper part of the hole expanding wing is located in the torque transmission groove.

[0019] Further, the torque transmission baffles are located on both sides of the pressure oil cylinder, the torque transmission baffles on both sides of the pressure oil cylinder form a guide space of the pressure oil cylinder, and a guide plate matched with the guide space is arranged on the piston rod of the pressure oil cylinder.

[0020] The utility model has the advantages of the following:

[0021] The utility model discloses a fixed connecting point is arranged, the hole expanding wing is rotated along the fixed connecting point by pressure oil cylinder, and the effective opening and closing of the hole expanding wing are realized. In the process that the hole expanding wing is rotated and opened and closed, the fixed connecting point is as the fixed stress point, the left and right component force of the hole expanding wing is increased in the use process, the hole expanding wing is reliably guaranteed to be easily opened and closed when expanding the hole, the defects, such as the difficulty of opening and closing of the hole expanding wing in the prior art are avoided, the effective closing caused by too much earth is avoided, the bottom expansion work efficiency is improved, and the failure rate and accident rate of bottom expansion construction are reduced. In the process of bottom expansion, the earth body is automatically entered into the material containing barrel, and the bottom expansion and hole cleaning are integrally carried out. DRAWINGS

[0022] Figure 1 It is the perspective view of the hole expanding wing closing of the hydraulic bottom expansion drill bit of the utility model;

[0023] Figure 2 It is the perspective view of the hole expanding wing opening of the hydraulic bottom expansion drill bit of the utility model;

[0024] Figure 3 It is the side view of the hydraulic bottom expansion drill bit of the utility model;

[0025] Figure 4 It is the A-A section view of the hole expanding wing closing; Figure 3

[0026] Figure 5 ​A-A sectional view of the embodiment of the present application for opening the hole; Figure 3 A-A sectional view of the embodiment of the present application for opening the hole;

[0027] Figure 6 A-A sectional view of the embodiment of the present application for opening the hole; Figure 3 A-A sectional view of the embodiment of the present application for opening the hole;

[0028] Figure 7 A-A sectional view of the embodiment of the present application for opening the hole; Figure 3 A-A sectional view of the embodiment of the present application for opening the hole;

[0029] Figure 8 A-A sectional view of the embodiment of the present application for opening the hole; A-A sectional view of the embodiment of the present application for opening the hole;

[0030] A-A sectional view of the embodiment of the present application for opening the hole; Figure 9 A-A sectional view of the embodiment of the present application for opening the hole; A-A sectional view of the embodiment of the present application for opening the hole;

[0031] A-A sectional view of the embodiment of the present application for opening the hole; Figure 10 A-A sectional view of the embodiment of the present application for opening the hole; A-A sectional view of the embodiment of the present application for opening the hole;

[0032] A-A sectional view of the embodiment of the present application for opening the hole; Figure 11 A-A sectional view of the embodiment of the present application for opening the hole. DETAILED DESCRIPTION A-A sectional view of the embodiment of the present application for opening the hole;

[0033] A-A sectional view of the embodiment of the present application for opening the hole; A-A sectional view of the embodiment of the present application for opening the hole;

[0034] The hydraulic bottom-expanding drill bit provided by the embodiment of the present application comprises a barrel body 1 and at least one hole-expanding wing 2, a vertical pressure oil cylinder 3 is arranged at the top of the barrel body 1, the upper end of the pressure oil cylinder 3 is fixed to the top plate 14 of the barrel body 1, and the lower end of the pressure oil cylinder 3 is connected to the hole-expanding wing 2 through a force transmission connecting rod 4. The two ends 5 and 6 of the force transmission connecting rod 4 are respectively hinged to the pressure oil cylinder 3 and the hole-expanding wing 4. Figures 1-11 The fixed support hinge point 7 on the hole-expanding wing 2 is rotatably connected (for example, hinged) to the fixed hinge point 8 on the barrel body 1, so that the hole-expanding wing 2 can rotate relative to the connecting point. A bottom-expanding soil pocket window 9 is arranged on the barrel body 1, through which the hole-expanding wing 2 passes and through which the soil under the cutting enters the barrel body 1.

[0035] The fixed support hinge point 7 on the hole-expanding wing 2 is rotatably connected (for example, hinged) to the fixed hinge point 8 on the barrel body 1, so that the hole-expanding wing 2 can rotate relative to the connecting point. A bottom-expanding soil pocket window 9 is arranged on the barrel body 1, through which the hole-expanding wing 2 passes and through which the soil under the cutting enters the barrel body 1.

[0036] When the pressure oil cylinder 3 drives the piston rod 10 to extend downward through oil pressure, the force transmission connecting rod 4, which is rotatable through the two ends, transmits the force to the hole-expanding wing 2, so that the hole-expanding wing 2 rotates outward along the fixed connecting point, and the hole-expanding wing extends out of the barrel body through the bottom-expanding soil pocket window 9. The barrel body rotates under the driving of the drilling machine, and in the rotating process, the hole-expanding wing 2 cuts the rock and soil in the hole through the rotary torque of the drilling machine, and the cut rock and soil is pocketed into the barrel body from the bottom-expanding soil pocket window 9 through the action of the hole-expanding wing 2.

[0037] When the earth in the barrel 1 reaches the requirement (full or close to full), the piston rod 10 of the pressure oil cylinder 3 is retracted upwards, the force is transmitted to the reaming wing 2 through the two-end hinged rotatable force transmission connecting rod 4, so that the reaming wing 2 rotates inward along the fixed connecting point, and the earth generated by the bottom expansion is closed in the barrel through the extrusion and lifting effect of the closing movement of the reaming wing on the earth.

[0038] Finally, the barrel is lifted to the outside of the borehole by the drilling machine, and the earth in the barrel is cleaned before the next rotary drilling.

[0039] The utility model discloses a position fixed connecting point is set, and the reaming wing is rotated along the position fixed connecting point through the pressure oil cylinder, effective opening and closing of the reaming wing are realized. In the process of rotating opening and closing of the reaming wing, the position fixed connecting point is as the fixed stress point, so that the left and right component forces of the reaming wing are increased in the use process, and the reaming wing is reliably ensured to be easily opened when reaming and effectively closed after containing earth, the defects, such as difficult opening and closing of the reaming wing in the prior art, are avoided, the bottom expansion work efficiency is improved, and the failure rate and accident rate of bottom expansion construction are reduced. The earth is automatically entered into the material containing barrel in the process of bottom expansion, and the bottom expansion and hole cleaning are integrally carried out.

[0040] In order to conveniently set the position fixed connecting point, the corresponding reaming wing fixed hinge 11 is fixedly arranged on the fixed hinge point 8 in the barrel 1, the reaming wing fixed hinge 11 is connected with the fixed support hinge point 7 on the reaming wing 2, and the reaming wing 2 can rotate relative to the reaming wing fixed hinge 11.

[0041] Specifically, the reaming wing fixed hinge 11 is vertically arranged with the plane of the reaming wing 2, the reaming wing fixed hinge 11 passes through the reaming wing 2 from the fixed support hinge point 7 on the reaming wing 2, and the two ends 12 and 13 of the reaming wing fixed hinge 11 are fixed in the side wall of the barrel 1 on the two sides of the plane of the reaming wing 2, and specifically, the two ends 12 and 13 are fixed at the fixed hinge point 8.

[0042] The pressure oil cylinder 3 drives the piston rod 10 to stretch and retract through oil pressure, so that the hinge of the force transmission connecting rod 4 rotates, and external force is applied to the reaming wing 2 to rotate along the reaming wing fixed hinge 11, so that the reaming wing 2 is opened and closed.

[0043] The number of the reaming wing 2 can be one, two, three, four or the like, the number of the pressure oil cylinder 3 is one, and the number of other components for opening and closing the reaming wing is adapted to the number of the reaming wing 2.

[0044] Further, the axis of the pressure oil cylinder 3 and the axis of the force transmission connecting rod 4 have a set angle. The angle is determined by the side wall cutting force required for reaming, rock breaking pressure, and the soil extrusion force of the reaming wing 2 after soil filling, so that the reaming wing 2 can efficiently cut rock and soil when opening and turning, and the soil can be reliably retracted into the barrel 1, so that the reaming wing 2 cannot be effectively retracted, and the bottom expander drill cannot be pulled out of the hole, and other in-hole accidents occur.

[0045] As an improvement of the embodiment of the utility model, the barrel 1 is provided with an arc-shaped guide rail 15, and the reaming wing 2 is provided with a guide roller 16, the guide roller 16 is arranged in the guide rail 15 and can move along the guide rail 15. Specifically, the arc shape of the guide rail 15 takes the connecting point formed by the fixed support hinge point 7 on the reaming wing 2 and the fixed hinge point 8 on the barrel 1 as the center.

[0046] In the prior art CN218509416U, the support point of the support rod and the guide groove on the outer barrel acts as both a force point and a trajectory guide structure during the opening and closing of the reaming wing. When the support point slides in the guide groove, it is easy to be stuck due to the action of the force point.

[0047] In the utility model, the guide roller 16 in the guide rail 15 only plays a guiding role and has no force bearing effect. The force is borne by the connecting point formed by the fixed support hinge point 7 on the reaming wing 2 and the fixed hinge point 8 on the barrel 1. The guide roller 16 moves in the guide rail 15 and is not easy to be stuck.

[0048] Specifically, to facilitate the arrangement of the guide rail 15, the barrel 1 has an inwardly recessed structure on the side wall, forming a vertically arranged planar portion 17. The guide rail 15 is arranged on the planar portion 17. The reaming wing 2 is fixedly connected with a horizontal pin shaft 18. The guide roller 16 is rotatably sleeved on the pin shaft 18.

[0049] To realize effective force transmission, the hinge point of the force transmission connecting rod 4 and the reaming wing 2 (i.e. the hinge point of the lower end 6 of the force transmission connecting rod 4) is located on the inner side of the upper part of the reaming wing 2. The fixed support hinge point 7 on the reaming wing 2 is located on the outer side of the upper part of the reaming wing 2. The position of the guide roller 16 arranged on the reaming wing 2 is located below the hinge point of the force transmission connecting rod 4 and the reaming wing 2, and below the fixed support hinge point 7 on the reaming wing 2, and specifically can be located at a middle position.

[0050] As another improvement of the embodiment of the utility model, the reaming wing 2 comprises a reaming wing panel 19 and a cutting tool 20. The soil-facing surface of the reaming wing panel 19 and the soil-facing surface of the cutting tool 20 have a set angle. The value of the set angle ranges from 120° to 150°.

[0051] When the drilling machine rotates, the vertical component force of the cutting tool 20 provided on the reaming wing 2 cuts into the rock and soil, and the horizontal component force slides the cut soil into the barrel, thereby removing the soil of the bottom expansion part. In the angle range of 120°-150°, the reaming wing 2 has good soil cutting effect and good soil holding effect when cutting the soil, that is, the cut soil can be effectively held into the barrel. The force of the bottom expansion cutting into the soil and the lifting force and extrusion force of the soil entering the drill bit during the closing process of the bottom expansion drill bit are effectively distributed. Preferably, the set angle is 135°.

[0052] The reaming wing 2 can further include a cutting tool plate 21 installed at the outer side and the bottom side edge of the reaming wing panel 19, the soil-facing surface of the reaming wing panel 19 and the soil-facing surface of the cutting tool plate 21 have the aforementioned set angle, the cutting tool 20 is installed on the cutting tool plate 21, and the two are parallel.

[0053] The cutting tool 20 can be a bucket tooth. When the reaming wing 2 is opened, the intersection of the outer side edge and the bottom side edge first contacts the rock and soil. In order to ensure the cutting effect, a pick 22 is provided at the intersection.

[0054] The bottom hole cleaning is ensured to be clean and comprehensive, and in particular, the technical problem of cleaning the sediment of the bottom expansion profile surface in the prior art is solved,

[0055] In the field of reaming, how to clean the cut soil and the bottom hole is a technical problem to be solved in the industry. In the prior art, the soil on the profile surface of the reaming wing is very difficult to clean, and sediment is easily formed at the bottom, which causes the formation of slag during the pouring of the cast-in-place concrete, thereby affecting the bearing capacity of the pile end.

[0056] To solve the problem, the utility model discloses a bottom hole cleaning plate 23 arranged at the bottom of the barrel 1, a soil scraping window 24 is formed on the bottom hole cleaning plate 23, and an inclined scraper 25 is arranged on the soil scraping window 24 and used to scrape the soil below the bottom hole cleaning plate 23 into the barrel through the soil scraping window 24.

[0057] The inclined scraper 25 is a rotating soil scraping mechanism used for removing the rock and soil sediment at the bottom. When the barrel 1 rotates, the rock and soil sediment below the bottom hole cleaning plate 23 is scraped by the inclined scraper 25, and the rock and soil sediment enters the barrel 1 from the soil scraping window 24 under the action of the inclined scraper 25, so that the reaming and hole cleaning of the bottom expansion drill bit are simultaneously performed.

[0058] In the process of the bottom expansion of the utility model, the soil at the bottom automatically enters the barrel, the bottom reaming and hole cleaning are simultaneously completed, the reliability of the bottom expansion and hole cleaning is ensured, the bottom hole cleaning is ensured to be clean and comprehensive, and in particular, the technical problem of cleaning the sediment of the bottom expansion profile surface in the prior art is solved, and the bearing capacity of the bottom expansion cast-in-place pile is greatly improved.

[0059] The hole cleaning bottom plate 23 is hinged to the side wall of the barrel 1, and the hinge is 26. A hanging part 27 is arranged on the inner wall of the hole cleaning bottom plate 23. A vertical pressure rod mechanism 28 is arranged on the top plate 14 of the barrel 1. The pressure rod mechanism 28 penetrates the top plate 14 downward into the barrel 1. A hook 29 is connected to the bottom end of the pressure rod mechanism 28 and cooperates with the hanging part 27. The hook 29 is unhooked from the hanging part 27 under the downward pressure of the pressure rod mechanism 28 and is hooked to the hanging part 27 under the resetting action of a resetting spring 30 arranged on the pressure rod mechanism 28.

[0060] When the pressure rod mechanism 28 exerts a downward force, the hook 29 is unhooked from the hanging part 27, and the hole cleaning bottom plate 23 is opened to unload the soil. Then, when the hole cleaning bottom plate 23 exerts an upward force, the hanging part 27 arranged on the hole cleaning bottom plate 23 is automatically connected to the hook 29, and the hole expansion and hole cleaning of the expanding bottom hole assembly are simultaneously completed.

[0061] Specifically, the pressure rod mechanism 28 includes an upper pressure rod 34 at the upper part and a lower pressure rod 35 at the lower part. The upper pressure rod 34 and the lower pressure rod 35 are connected by a connecting rib 39 plate to change the axial position of the lower pressure rod 35, so that the lower pressure rod 35 is located at the inner edge of the barrel to avoid interfering with the soil feeding and unloading of the barrel 1. The bottom end of the lower pressure rod 35 is hinged to the hook 29 through a hook connecting rod 36 to realize reliable connection and unhooking of the hook 29 and the hanging part 27.

[0062] The connection between the hole cleaning bottom plate 23 and the barrel 1 can be provided with a torque transmission block 37. The torque transmission block 37 is fixed to the hole cleaning bottom plate 23 and inserted into the notch of the side wall of the barrel 1 to transmit the torque of the barrel 1 to the hole cleaning bottom plate 23.

[0063] A connecting flange 31 is fixedly arranged above the top plate of the barrel 1 to link with the drilling machine and transmit the torque of the drilling machine. The connecting flange 31 is reliably connected or welded with the center of the barrel 1 to form an integral whole.

[0064] A vertical torque transmission baffle 32 is fixedly arranged inside the barrel 1 below the top plate 14 of the barrel 1. The torque transmission baffle 32 is arranged perpendicularly to the plane of the hole expanding wing 2. A torque transmission groove 33 is formed in the torque transmission baffle 32, and the upper part of the hole expanding wing 2 is located in the torque transmission groove 33. The torque generated during the hole expanding process of the hole expanding wing is transmitted to the torque transmission baffle 32 at the torque transmission groove 33, and the torque transmission baffle 32 offsets this part of the torque to prevent the torque from being transmitted to the force transmission connecting rod 4 and the pressure cylinder 3 to cause structural damage.

[0065] The torque transmission baffle 32 is located on both sides of the pressure cylinder 3. The torque transmission baffles 32 on both sides of the pressure cylinder 3 form a guide space for the pressure cylinder 3. A guide plate 38 is arranged on the piston rod 10 of the pressure cylinder 3 to cooperate with the guide space. Under the action of the guide plate 38 and the guide space, the piston rod 10 of the pressure cylinder 3 moves vertically.

[0066] The force transmission connecting rod 4 can be arranged on the guide plate 38, and the force transmission connecting rod 4 can be arranged on each side of the guide plate 38 to cooperate with the plurality of hole expanding wings 2.

[0067] The above is the preferred embodiment of the present application, it should be pointed out that, for those skilled in the art, without departing from the principles described in the present application, can make a number of improvements and refinements, these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A hydraulic underreamer, comprising: The device comprises a barrel and at least one reaming wing, a vertical pressure oil cylinder is arranged at the top of the barrel, the pressure oil cylinder is connected with the reaming wing through a force transmission link, the two ends of the force transmission link are respectively hinged with the pressure oil cylinder and the reaming wing, a fixed support hinge point on the reaming wing is rotatably connected with a fixed hinge point on the barrel, a bottom digging window is arranged on the barrel for the reaming wing to pass through and for the cut soil to enter the barrel.

2. The hydraulic underreamer of claim 1, wherein, A corresponding reaming wing fixed hinge is arranged on the inside of the barrel at the fixed hinge point, the reaming wing fixed hinge is connected with the fixed support hinge point on the reaming wing, and the reaming wing can rotate relative to the reaming wing fixed hinge.

3. The hydraulic underreamer of claim 2, wherein, The reaming wing fixed hinge is arranged vertically to the plane of the reaming wing, the reaming wing fixed hinge passes through the reaming wing from the fixed support hinge point on the reaming wing, and the two ends of the reaming wing fixed hinge are respectively fixed in the barrel side wall on both sides of the plane of the reaming wing.

4. The hydraulic underreamer of claim 1, wherein, The axis of the pressure oil cylinder and the axis of the force transmission link have a set included angle.

5. The hydraulic underreamer of any one of claims 1-4, wherein, An arc-shaped guide rail is arranged on the barrel, a guide roller is arranged on the reaming wing, and the guide roller is arranged in the guide rail and can move along the guide rail.

6. The hydraulic underreamer of claim 5, wherein, The barrel side wall has an inwardly recessed structure, forming a vertically arranged plane part, the guide rail is arranged on the plane part, a horizontal pin shaft is fixedly connected to the reaming wing, and the guide roller is rotatably sleeved on the pin shaft.

7. The hydraulic underreamer of claim 5, wherein, The hinge point of the force transmission link and the reaming wing is located in the inner side of the upper part of the reaming wing, the fixed support hinge point on the reaming wing is located in the outer side of the upper part of the reaming wing, the position of the guide roller arranged on the reaming wing is located below the hinge point of the force transmission link and the reaming wing and below the fixed support hinge point on the reaming wing.

8. The hydraulic underreamer of claim 1, wherein, The reaming wing comprises a reaming wing panel and a cutting tool, the earth-facing surface of the reaming wing panel and the earth-facing surface of the cutting tool have a set included angle, and the set included angle is in the range of 120°-150°.

9. The hydraulic underreamer of claim 8, wherein, The reaming wing further comprises a cutting tool plate, the cutting tool plate is installed at the outer side and the bottom side edge of the reaming wing panel, the earth-facing surface of the reaming wing panel and the earth-facing surface of the cutting tool plate have the set included angle, and the cutting tool is installed on the cutting tool plate.

10. The hydraulic underreamer of claim 1, wherein, A hole cleaning bottom plate is arranged at the bottom of the barrel, a soil scraping window is arranged on the hole cleaning bottom plate, and an inclined scraper for scraping the soil below the hole cleaning bottom plate into the barrel through the soil scraping window is arranged on the soil scraping window.

11. The hydraulic underreamer of claim 10, wherein, The hole cleaning bottom plate is hinged with the side wall of the barrel, a hanging part is arranged on the inner wall of the hole cleaning bottom plate, a vertical pressure rod mechanism is arranged on the top plate of the barrel, the pressure rod mechanism passes through the top plate downward into the barrel, a hook matched with the hanging part is connected to the bottom end of the pressure rod mechanism, the hook is unhooked from the hanging part under the downward pressure of the pressure rod mechanism, and the hook is hooked with the hanging part under the resetting action of a resetting spring arranged on the pressure rod mechanism.

12. The hydraulic underreamer of claim 1, wherein, The connecting flange is fixed above the top plate of the cylinder body, and the vertical torque transmission baffle is fixed below the top plate of the cylinder body in the cylinder body.

13. The hydraulic underreamer of claim 12, wherein, The torque transmission baffles are located on both sides of the pressure oil cylinder, and the torque transmission baffles on both sides of the pressure oil cylinder form a guide space of the pressure oil cylinder.

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