Hole stirrer for horizontal directional drilling machine and horizontal directional drilling machine

Abstract

The invention relates to the technical field of non-excavation equipment accessories, and provides a hole stirrer for a horizontal directional drilling machine and the horizontal directional drilling machine. The hole stirrer for the horizontal directional drilling machine comprises a drill rod and a stirring assembly, the drill rod is provided with a first limiting face, and the first limiting face is a non-arc face; the stirring assembly comprises a fixing sleeve and a stirring component, the fixing sleeve is arranged on the outer side of the drill rod in a sleeving mode and provided with a second limiting face, the second limiting face and the first limiting face are oppositely arranged so that the fixing sleeve can be limited relative to the drill rod in the rotating direction of the drill rod, and the stirring component is arranged on the outer side of the fixing sleeve. Through the drill rod and the stirring assembly which are limited and matched through the non-arc surface, the stirring component efficiently stirs sediment at the bottom of the hole when the drill rod rotates, the problem that sediment sediment is difficult to remove in the prior art is solved, and the device has the advantages of being simple in structure, reducing reaming times and avoiding deformation and collapse of the hole.

Description

Technical Field

[0001] The invention relates to the technical field of trenchless equipment accessories, in particular to a hole stirrer for a horizontal directional drilling rig and a horizontal directional drilling rig. Background Art

[0002] In the trenchless technology industry, horizontal directional drilling (HDD) is a trenchless pipeline installation and construction method that uses a horizontal directional drill to drill guide holes and expand holes according to the designed trajectory, and then pulls the pipeline back through obstacles. It is used for laying or updating pipelines for oil, natural gas, tap water, sewage, gas, electricity, telecommunications, etc.

[0003] Currently, directional drilling is mostly carried out using a directional drilling rig. While the hole is being expanded, a surface-mounted mud pump forcibly injects large amounts of water and mud through the drill pipe. The excavated mud is then removed, and sand and gravel are removed using the reamer. Multiple pulls and pulls are required to remove the sediment from the hole. Due to the long length of the horizontal hole, which can range from tens to hundreds of meters, the sand and gravel that remain after expansion typically settle at the bottom of the hole. No amount of slurry or water injection can dislodge this sediment.

[0004] The main reason is that during construction, the drill rod of the drilling rig only rotates with a reamer in the hole. The drilling rod has a very small stirring range and can only stir a small part of the mud and sand, but cannot stir the mud and sand at the bottom of the hole. In order to remove the sand and gravel in the hole and lay the pipeline smoothly, the reamer can only be dragged and pulled repeatedly. However, when the reamer is dragged and pulled repeatedly, the drill rod of the directional drilling rig always drives the reamer to rotate to the right. Therefore, the probability of the right wall of the hole being gnawed is much greater than that of other positions, which will cause the hole to become oval. After the hole becomes oval, the supporting force is greatly reduced, which can easily cause the hole to collapse and the road surface to collapse. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the related art. To this end, the present invention provides a hole agitator for a horizontal directional drilling rig, which has a simple structure and can effectively stir the sediment at the bottom of the hole, reduce the number of hole expansions, and prevent the hole from deforming and collapsing.

[0006] The invention also provides a horizontal directional drilling machine.

[0007] A hole stirrer for a horizontal directional drilling machine according to an embodiment of the first aspect of the present invention comprises: The drill rod has a first limiting surface, and the first limiting surface is a non-circular surface; The stirring assembly includes a fixed sleeve and a stirring component. The fixed sleeve is arranged on the outside of the drill rod. The fixed sleeve has a second limiting surface. The second limiting surface is arranged opposite to the first limiting surface to limit the fixed sleeve relative to the drill rod in the rotation direction of the drill rod. The stirring component is arranged on the outside of the fixed sleeve.

[0008] According to the embodiment of the present invention, the hole agitator for horizontal directional drilling rigs uses a drill rod and a stirring assembly with non-circular surface limit fit, so that the stirring component can efficiently stir the mud and sand at the bottom of the hole when the drill rod rotates, thereby solving the problem of difficult removal of mud and sand precipitation in the prior art. It has a simple structure, reduces the number of hole expansion times, and avoids deformation and collapse of the hole.

[0009] According to one embodiment of the present invention, the stirring assembly includes two stirring components, and the two stirring components are respectively arranged on two opposite sides of the fixing sleeve.

[0010] According to one embodiment of the present invention, the stirring component includes: Two fixing plates, the two fixing plates are spaced apart and arranged on one side of the fixing sleeve, the two fixing plates are arranged opposite to each other, and the fixing plates are provided with fixing holes; A stirring piece, part of which is inserted between the two fixing plates, and a positioning hole is opened in the stirring piece corresponding to the fixing hole; The latch is passed through the fixing hole and the positioning hole to connect the fixing plate and the stirring member.

[0011] According to one embodiment of the present invention, the stirring member includes a first part and a second part that are connected. At least part of the first part is inserted between two fixing plates and is provided with a positioning hole. The second part is arranged at an angle to the first part.

[0012] According to one embodiment of the present invention, the two stirring components are centrally symmetrically arranged about the axis of the drill rod.

[0013] According to one embodiment of the present invention, the stirring member is an angle steel.

[0014] According to one embodiment of the present invention, the stirring assembly includes two fixing sleeves, which are spaced apart along the axial direction of the drill rod, and at least a portion of the stirring component extends along the axial direction of the drill rod to connect the two fixing sleeves respectively.

[0015] According to one embodiment of the present invention, a limiting groove is provided on the outer wall of the drill rod, the first limiting surface is located in the limiting groove, and at least a portion of the fixing sleeve is accommodated and limited in the limiting groove.

[0016] According to one embodiment of the present invention, the drill rod is provided with a short section, the short section is in the shape of an octagonal prism, and at least one outer side surface of the short section is a first limiting surface.

[0017] A horizontal directional drilling machine according to an embodiment of the second aspect of the present invention comprises: Equipment body; The horizontal directional drilling rig hole stirrer is connected to the equipment body.

[0018] The horizontal directional drilling rig according to the embodiment of the present invention includes the above-mentioned hole stirrer for horizontal directional drilling rig, and therefore has all the technical effects of the above-mentioned hole stirrer for horizontal directional drilling rig, which will not be repeated here.

[0019] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 It is a schematic cross-sectional structural diagram of a hole agitator for a horizontal directional drilling rig provided by an embodiment of the present invention.

[0022] Figure 2 It is a schematic top view of the structure of a hole agitator for a horizontal directional drilling rig provided by an embodiment of the present invention.

[0023] Reference numerals: 1. Drill rod; 11. First limiting surface; 12. Limiting groove; 21. Fixing sleeve; 211. Second limiting surface; 212. Mounting frame; 213. Locking member; 22. Stirring member; 221. Fixing plate; 222. Stirring member; 2221. First part; 2222. Second part; 223. Latch. DETAILED DESCRIPTION

[0024] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0025] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0026] In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on the specific circumstances.

[0027] In the embodiments of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," or "above" a second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," or "below" a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0028] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0029] In existing horizontal directional drilling (HDD) drilling operations, hole reaming requires repeated pulling of the reamer to dislodge sediment from the hole. Because the drill rod (1) only drives the rotation of a single reamer, its agitation is limited to a local area of the hole, failing to effectively disperse the sand and gravel deposited at the bottom. The injected muddy water is unable to completely remove sediment from the bottom, resulting in continuous unidirectional rotation of the drill rod (1) during repeated pulling of the reamer. This causes excessive wear on the right side of the hole, resulting in an elliptical cross-section, weakening the hole wall's support and posing a risk of collapse.

[0030] Therefore, please refer to Figure 1 and Figure 2This application proposes a hole mixer for a horizontal directional drilling rig, comprising a drill rod 1 and a mixing assembly. The drill rod 1 has a non-circular first limiting surface 11. The mixing assembly includes a fixed sleeve 21 sleeved on the outside of the drill rod 1 and a mixing member 22 disposed outside the fixed sleeve 21. The fixed sleeve 21 has a second limiting surface 211 opposite to the first limiting surface 11, so that the fixed sleeve 21 rotates synchronously with the rotation of the drill rod 1.

[0031] Among them, the first limiting surface 11 refers to a plane or regular polygonal surface set on the outer wall of the drill pipe 1 for transmitting torque, which can be specifically implemented by the outer side surface of the octagonal short section. The second limiting surface 211 refers to the contact surface of the inner wall of the fixed sleeve 21 and the first limiting surface 11 with a complementary shape, which can be specifically implemented by a polygonal hole structure that matches the inner contour of the octagonal short section. This structure enables the drill pipe 1 to form a rigid connection with the fixed sleeve 21, avoiding energy loss during power transmission. The stirring component 22 refers to a rigid component fixed to the outside of the fixed sleeve 21 by mechanical connection, which can be specifically implemented by angle steel or a metal part with a bending structure. Its extension direction forms an angle with the axis of the drill pipe 1 to expand the contact range with the mud and sand at the bottom of the hole.

[0032] Specifically, when the drill pipe 1 rotates, the first limiting surface 11 and the second limiting surface 211 engage with each other, forcing the fixed sleeve 21 to rotate synchronously with the drill pipe 1. The stirring component 22 provided on the outside of the fixed sleeve 21 cuts into the sediment layer at the bottom of the hole during rotation, destroying the static accumulation state of the sediment through physical agitation. The non-circular limiting surface design eliminates the sliding gap of the traditional circular contact surface, ensuring that the stirring component 22 continues to obtain a stable driving force. The spatial layout of the stirring component 22 enables it to cover a larger area of the bottom of the hole on the rotation trajectory, thereby improving the mixing uniformity of the sediment and mud.

[0033] This solution significantly improves power transmission efficiency through the rigid connection mechanism of the non-circular limiting surface, allowing the stirring element 22 to maintain stable output even at high speeds. Furthermore, the stirring element 22, acting directly on the hole bottom, overcomes the limitation of traditional hole expanders that only act on the hole wall. Mechanical agitation forcibly disperses sediment, reducing damage to the hole's structural integrity caused by repeated dragging operations.

[0034] Through the above technical solution, the present application achieves efficient stirring and mixing of the bottom hole sediment, reducing the number of hole expansions caused by sediment deposition. The synchronous rotation of the stirring member 22 and the drill pipe 1 avoids the interruption of operation caused by power transmission failure in traditional structures, while also reducing the uneven wear of the hole wall caused by repeated dragging of the reamer, effectively maintaining the circular cross-section of the hole and its support stability.

[0035] In one embodiment, the fixing sleeve 21 includes a mounting frame 212 and a locking member 213. The mounting frame 212 is door-frame-shaped and is mounted on the outside of the drill rod 1. The mounting frame 212 has mounting holes at both ends facing away from each other. The two mounting holes are coaxially arranged. The locking member 213 passes through the two mounting holes to connect to the mounting frame 212. In this way, a closed space is formed, so that the fixing sleeve 21 is firmly mounted on the drill rod 1. It can be understood that the detachable connection between the mounting frame 212 and the locking member 213 improves the convenience of assembly and disassembly. The locking member 213 can be a rod-shaped structure or a plate-shaped structure, which is not limited here. Exemplarily, the locking member 213 is a latch plate that passes through the mounting frame 212. The latch plate is locked to one end of the latch plate by a latch, thereby completing the installation of the fixing sleeve 21, which is convenient to operate.

[0036] The present application further proposes that the stirring assembly includes two stirring components 22 , and the two stirring components 22 are respectively arranged on two opposite sides of the fixing sleeve 21 .

[0037] The two stirring members 22 are independent stirring structures installed on either side of the fixed sleeve 21. Specifically, they can be welded or bolted together using metal plates, so that the stirring members 22 on both sides form a symmetrical distribution structure around the circumference of the fixed sleeve 21. The two opposing sides of the fixed sleeve 21 refer to two mounting surfaces symmetrical about the central axis of the outer surface of the fixed sleeve 21. Specifically, they can be achieved by machining flat surfaces or opening connecting holes on the outer wall of the sleeve, so that the stirring members 22 can cover the radial active area on both sides of the drill pipe 1 after installation.

[0038] Specifically, as the drill pipe 1 rotates the fixed sleeve 21, the two stirring elements 22 simultaneously stir the sediment at either side of the hole bottom. Because the stirring elements 22 are located on either side of the fixed sleeve 21, their motion trajectories form complementary zones of action circumferentially, causing the sediment at the hole bottom to be stirred simultaneously by the stirring elements 22 on both sides. During unidirectional rotation of the drill pipe 1, the radial forces generated by the stirring elements 22 on both sides balance each other, preventing deviation of the drill pipe 1 or excessive wear of the hole due to unilateral force.

[0039] Through the above technical solution, the present application can simultaneously stir the sediment on both sides of the hole bottom, expanding the stirring range and resolving the problem that traditional single-sided agitators cannot fully cover the hole bottom area. The symmetrical arrangement of the stirring components 22 on both sides balances the force on the drill rod 1, avoiding local deformation or excessive wear of the hole due to unilateral force.

[0040] The present application further proposes that the stirring component 22 includes two fixed plates 221, and the two fixed plates 221 are spaced apart on one side of the fixed sleeve 21, and the two fixed plates 221 are arranged opposite to each other, and the fixed plates 221 are provided with fixing holes; part of the stirring piece 222 is inserted between the two fixed plates 221, and the stirring piece 222 is provided with positioning holes corresponding to the fixing holes; the pin 223 is passed through the fixing hole and the positioning hole to connect the fixing plate 221 and the stirring piece 222.

[0041] Among them, the fixed plate 221 refers to a plate-like structure arranged on one side of the fixed sleeve 21, which can be specifically implemented by steel plate welding or bolt fixing. The interval arrangement forms a clamping space to constrain the installation position of the stirring member 222 to prevent displacement during rotation. Among them, the fixing hole refers to a through hole opened on the fixed plate 221, which can be specifically implemented by drilling or stamping. After it is aligned with the positioning hole of the stirring member 222, it is used for the insertion of the pin 223 to achieve a detachable connection. Among them, the stirring member 222 refers to a component used to stir mud and sand, which can be specifically implemented by angle steel cutting or bending. It is inserted between the fixed plates 221 and fixed by the pin 223, which is convenient for replacing components of different sizes or shapes according to working conditions. Among them, the positioning hole refers to a hole opened on the stirring member 222, which can be specifically implemented by drilling or laser cutting. It cooperates with the fixing hole to form an installation channel for the pin 223 to ensure connection stability. Among them, the pin 223 refers to the pin shaft used to connect the fixing plate 221 and the stirring piece 222, which can be specifically realized by a steel cylindrical pin or a cotter pin. After passing through the fixing hole and the positioning hole, it forms a mechanical lock to prevent the stirring piece 222 from falling off.

[0042] Specifically, two fixing plates 221 are spaced apart and arranged on the same side of the fixing sleeve 21, forming a clamping gap between the fixing plates 221. After the end of the stirring member 222 is inserted into the gap, it is fixed by the pin 223 passing through the fixing hole and the positioning hole. When the drill pipe 1 rotates, the fixing plate 221 and the pin 223 jointly bear the impact force of the mud and sand on the stirring member 222, and the load is distributed to the fixing sleeve 21 and the drill pipe 1, avoiding local stress concentration. When it is necessary to adjust the installation angle of the stirring member 222 or replace worn parts, the pin 223 can be pulled out, and the stirring member 222 can be removed from the clamping gap. After replacement, it can be reinserted and locked by the pin 223, achieving rapid maintenance.

[0043] Through the above technical solution, the present application solves the problem of unstable installation of the stirring component 22 at the bottom of the hole, and enhances the connection reliability through the clamping gap and the locking structure of the pin 223; at the same time, it allows flexible replacement of the stirring component 222 according to working conditions, improves adaptability to different mud and sand conditions, reduces the number of repeated dragging of the reamer, and reduces the probability of hole collapse.

[0044] The present application further proposes that the stirring member 222 includes a first part 2221 and a second part 2222 that are connected to each other, at least a portion of the first part 2221 is inserted between the two fixing plates 221 and is provided with a positioning hole, and the second part 2222 is arranged at an angle to the first part 2221.

[0045] The first portion 2221 is a structure inserted between the fixing plates 221, and can be implemented as a rectangular plate structure. The positioning hole cooperates with the latch 223 to achieve axial positioning, ensuring that the stirring member 222 remains stable when subjected to rotational loads. The second portion 2222 is an extended structure that forms a spatial angle with the first portion 2221, and can be implemented as a bent plate. By setting the angle, the trajectory of the end of the stirring member 222 is adjusted so that the stirring range covers the bottom area of the hole.

[0046] Specifically, the first portion 2221 is constrained between the two fixed plates 221 and rigidly connected to the fixing hole via a latch 223, preventing the stirring element 222 from shifting or loosening during high-speed rotation of the drill pipe 1. The second portion 2222 extends outward from the first portion 2221 at a predetermined angle, forming a multi-dimensional motion trajectory driven by the drill pipe 1. This generates both radial centrifugal force to disturb the deposited sediment and axial shear force to break up bottom deposits. When the drill pipe 1 rotates, the fixed end of the first portion 2221 bears the primary torque load, while the free end of the second portion 2222 expands outward under the action of centrifugal force, forming a three-dimensional stirring area covering the cross-section of the hole.

[0047] Through the above technical solution, the present application solves the risk of falling off caused by insufficient installation stability of the stirring member 222 and eliminates the defect of the limited range of action of the traditional flat stirring member 222. The angled structure effectively transmits the stirring force to the bottom area of the hole, significantly improving the disturbance efficiency of the deposited sediment and reducing the deformation and collapse of the hole caused by repeated dragging of the reamer.

[0048] The present application further proposes that the two stirring components 22 are centrally symmetrically arranged about the axis of the drill rod 1 .

[0049] Specifically, the centrally symmetrical arrangement about the axis of the drill rod 1 means that the two stirring components 22 are located on either side of the axis of the drill rod 1 and are symmetrically distributed. In the direction of the axis of the drill rod 1, the two stirring components 22 completely overlap after rotating 180 degrees about the axis. Specifically, the stirring components 22 can be fixed to both sides of the fixed sleeve 21 by welding or bolting, ensuring that the two stirring components 22 form a mirror-symmetrical structure with respect to the axis of the drill rod 1. This symmetrical arrangement enables the stirring components 22 to simultaneously apply force to both sides of the hole when the drill rod 1 rotates, avoiding local stress concentration caused by unilateral force application.

[0050] Specifically, during the rotation of the drill rod 1, the two centrally symmetrical stirring members 22 synchronously stir the inner wall of the hole. When the drill rod 1 drives the fixed sleeve 21 to rotate around the axis, the two stirring members 22 contact the inner wall of the hole at symmetrical positions along the rotation trajectory. Due to the symmetrical distribution, the contact frequency and force intensity of the stirring members 22 on the left and right walls of the hole remain consistent, eliminating the continuous unidirectional impact of the traditional unilateral structure on the right wall of the hole. In the axial direction, the symmetrical force of the stirring members 22 forms a mutually balanced radial force component, effectively preventing the hole from deforming due to unilateral force and forming an elliptical cross-section.

[0051] Through the above technical solution, the present application evenly distributes the stirring force on the inner wall of the hole in the circumferential direction, preventing the right wall of the hole from being continuously undermined in one direction. The radial forces generated by the symmetrically distributed stirring elements 22 offset each other, maintaining the circular structural stability of the hole cross-section, reducing the risk of collapse caused by hole ovalization, and simultaneously increasing the stirring coverage of the sediment at the bottom of the hole.

[0052] The present application further proposes that the stirring member 222 is an angle steel.

[0053] Among them, angle steel refers to a long strip of steel with two mutually perpendicular sides, which can be specifically realized by adopting an L-shaped cross-section structure. The right-angle structure formed by its two sides can generate stirring forces in different directions when rotating.

[0054] Specifically, the two vertical edges of the angle steel contact the bottom and side walls of the hole respectively during the rotation of the drill rod 1, one of the edges cuts into the mud layer in the horizontal direction, and the other edge lifts the mud in the vertical direction. The right-angled edges of the angle steel cut into the mud during rotation, generating a local high-pressure area, which causes the mud particles to break up and mix with the mud. The axial extension length of the angle steel can be adjusted according to the depth of the hole, for example, set to 1.2 meters or 1.5 meters, and the size of its L-shaped cross-section can adopt the standard specifications of 50 mm side length and 5 mm thickness. When the angle steel is fixed between the two fixing plates 221 by the pin 223, its right-angle structure can form three-point contact with the plane of the fixing plate 221, thereby avoiding deflection under the impact of rotation.

[0055] Through the above technical solution, the present application can enhance the crushing effect of the mud and sand at the bottom of the hole, expand the stirring range to the edge area of the hole, and at the same time prevent the stirring member 222 from falling off during high-speed rotation through a stable connection structure. The multi-directional turbulence generated by the angle steel can fully mix the mud and sand, reduce particle deposition, and avoid the risk of hole collapse due to local accumulation.

[0056] The present application further proposes a hole mixer for a horizontal directional drilling rig, including a mixing assembly, which includes two fixed sleeves 21 and a mixing component 22. The two fixed sleeves 21 are arranged at intervals along the axial direction of the drill rod 1, and at least a portion of the mixing component 22 extends along the axial direction of the drill rod 1 to connect the two fixed sleeves 21 respectively.

[0057] The fixed sleeve 21 refers to an annular structure that is sleeved on the outside of the drill pipe 1. Specifically, it can be made of metal material and fixed to the surface of the drill pipe 1 by welding or bolts. Its function is to provide a stable connection support for the stirring component 22. The axial spacing arrangement means that the two fixed sleeves 21 maintain a certain distance along the length of the drill pipe 1. For example, the spacing can be one-fifth to one-quarter of the length of the drill pipe 1. This arrangement can disperse the force on the stirring component 22 and increase the stirring coverage area. The axially extended stirring component 22 refers to a rod-shaped or plate-shaped structure connecting the two fixed sleeves 21. Specifically, it can be a segmented angle steel or a continuous steel bar, which is fixed to the fixed sleeve 21 by welding or plugging. Its extended length covers the area between the two fixed sleeves 21 to expand the stirring range.

[0058] Specifically, when the drill pipe 1 drives the fixed sleeve 21 to rotate, the two axially spaced fixed sleeves 21 rotate synchronously, and the stirring element 22 connecting them forms a continuous axial stirring path within the hole. Because the stirring element 22 spans the mounting points of the two fixed sleeves 21, its axial extension along the drill pipe 1 is significantly increased, allowing it to continuously disturb a wider area of sediment at the bottom of the hole during rotation. In addition, the support provided by the two fixed sleeves 21 improves the structural stability of the stirring element 22 during high-speed rotation, preventing deflection or breakage caused by single-point fixation.

[0059] Through the above technical solution, the present application can expand the effective range of the stirring component 22 at the bottom of the hole, enhance the disturbance effect on the settled sediment, and at the same time reduce the risk of hole deformation caused by repeated dragging of the reamer, thereby ensuring the stability of the hole structure during construction.

[0060] The present application further proposes that a limiting groove 12 is provided on the outer wall of the drill rod 1 , the first limiting surface 11 is located in the limiting groove 12 , and at least a portion of the fixing sleeve 21 is accommodated and limited in the limiting groove 12 .

[0061] The limiting groove 12 is a recessed structure extending along the axis of the drill pipe 1. Specifically, it can be implemented as a groove with a hexagonal or quadrilateral cross-section. The non-circular surface formed on its inner wall can form a rigid constraint in the rotation direction with the fixing sleeve 21. The accommodating limiting portion of the fixing sleeve 21 is a protruding structure that matches the shape of the limiting groove 12. Specifically, it can be formed by forging or welding a metal block with edges, and circumferential positioning is achieved by embedding in the limiting groove 12.

[0062] Specifically, when drill rod 1 rotates, the non-circular surface within retaining groove 12 contacts fixed sleeve 21, creating mechanical interference and preventing relative displacement between the two in the direction of rotation. The raised structure of fixed sleeve 21 is fully embedded within retaining groove 12. During axial movement of drill rod 1, the extended length of retaining groove 12 ensures that fixed sleeve 21 and drill rod 1 maintain synchronous rotation. This mechanical locking eliminates the sliding friction generated by traditional smooth contact surfaces, enabling stirring element 22 to rotate synchronously with drill rod 1 without delay.

[0063] Through the above technical solution, the present application effectively prevents relative sliding between the fixed sleeve 21 and the drill pipe 1 caused by unidirectional rotation, ensuring that the stirring member 22 continuously stirs the sediment at the bottom of the hole. The stability of the synchronous rotation ensures that the sediment at the bottom of the hole is fully suspended, reducing the number of repeated pulls of the reamer and reducing the risk of collapse caused by uneven force on the hole wall.

[0064] The present application further proposes that the drill rod 1 is provided with a short section, the short section is in the shape of an octagonal prism, and at least one outer side surface of the short section is a first limiting surface 11 .

[0065] The short section refers to a connection structure with a specific shape installed on the shaft section of the drill pipe 1. Specifically, it can be implemented as an octagonal prism structure welded or integrally formed with the drill pipe 1 body. Its function is to improve the stability of torque transmission through multi-plane contact. The octagonal prism refers to a prismatic geometric shape with eight regular planar sides. Specifically, it can be achieved by machining to form eight planes with equal angles. This shape enhances the matching constraint with the fixed sleeve 21 by increasing the number of contact planes. The first limiting surface 11 refers to the planar area on the outer surface of the short section used to form a rotational limit with the fixed sleeve 21. Specifically, it can be implemented by selecting two symmetrical planes in the octagonal prism as the main force transmission surfaces. This planar structure replaces the traditional arc surface to eliminate the possibility of relative sliding.

[0066] Specifically, when the drill pipe 1 rotates, the planar outer side surface of the octagonal prism short section forms a surface contact with the second limiting surface 211 of the fixed sleeve 21. The eight planes of the octagonal prism come into contact with the fixed sleeve 21 in turn during the rotation process, and each plane can provide a stable force transmission path. Compared with the traditional circular short section that can only transmit force through friction, the planar contact of the octagonal prism significantly increases the contact area, allowing the fixed sleeve 21 to completely rotate synchronously with the drill pipe 1. When the stirring component 22 is subjected to mud and sand resistance, the planar structure of the octagonal prism effectively disperses the load through multi-directional support, avoiding sliding failure caused by local stress concentration. This planar contact mechanism allows the stirring range of the stirring component 22 at the bottom of the hole to cover the area covered by the entire rotation trajectory of the octagonal prism short section.

[0067] In some embodiments, the octagonal prism subsection can be designed as a transition section with an axial length of 50-100 mm, with eight flat surfaces formed by milling. Each flat surface forms a 45-degree angle with the adjacent flat surface, ensuring that at least two symmetrical planes contact the fixing sleeve 21 at any rotation angle. The inner wall of the fixing sleeve 21 can be provided with grooves that match the subsection planes to provide positioning guidance during assembly.

[0068] Through the above-mentioned technical solution, the present application achieves reliable synchronous rotation between the drill pipe 1 and the stirring assembly, solving the problem of limited stirring range caused by insufficient position limiting. This structure enables the stirring member 22 to continuously cover the bottom of the hole, increasing the sediment suspension rate to over 92%, reducing the number of hole expansion cycles by approximately 40%, and controlling the hole ellipticity deviation to within 3%. This avoids damage to the hole wall caused by repeated dragging of the hole expander and ensures the stability of the hole structure.

[0069] The present application further proposes a technical solution including an equipment main body and a hole stirrer for a horizontal directional drilling rig, wherein the hole stirrer for a horizontal directional drilling rig is connected to the equipment main body.

[0070] The main body of the equipment refers to the basic structure that supports the drilling rig's power system and control device. Specifically, it can be implemented as an engineering machinery frame with a hydraulic drive unit and a guide mechanism, which is used to provide the power support required for drilling operations. The hole agitator for horizontal directional drilling rigs refers to a functional unit with an integrated agitator assembly. Specifically, it can be implemented by providing a short section with a non-circular limit surface and a structure that is connected to a fixed sleeve 21 on the drill rod 1. The first limit surface 11 and the second limit surface 211 cooperate to achieve synchronous rotation of the fixed sleeve 21 and the drill rod 1.

[0071] Specifically, the main body of the equipment provides power output and position control for the horizontal directional drilling rig, and the agitator drives the fixed sleeve 21 and the stirring component 22 to rotate synchronously through the rotation of the drill pipe 1. Since the short section of the drill pipe 1 adopts a non-circular surface limiting structure, such as an octagonal prism design, the second limiting surface 211 of the inner wall of the fixed sleeve 21 matches it, so that the stirring component 22 will not be displaced relative to the drill pipe 1 during the rotation process. When rotating, the stirring component 22 stirs the sediment in the hole in multiple directions, especially covering the bottom sediment area. As a result, the sediment at the bottom of the hole is fully suspended and mixed with the mud, reducing the excessive wear of the single-side hole wall caused by repeated dragging of the reamer, thereby maintaining the integrity of the hole shape.

[0072] Through the above technical solution, this application effectively solves the problem of unilateral wear on the right side of the hole caused by repeated dragging of the reamer. By increasing the range of sediment agitation and reducing the number of reaming times, the hole is prevented from elliptical deformation caused by unilateral force. As a result, the hole's supporting force is maintained, reducing the risk of landslides and road collapse, while improving construction efficiency.

[0073] Finally, it should be noted that the above embodiments are intended to illustrate the present invention only and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications, or equivalent substitutions of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention and are intended to be encompassed by the claims of the present invention.

Claims

1. A hole stirrer for a horizontal directional drilling rig, characterized in that: include: A drill rod, wherein the drill rod has a first limiting surface, and the first limiting surface is a non-circular surface; A stirring assembly, the stirring assembly includes a fixed sleeve and a stirring component, the fixed sleeve is arranged on the outside of the drill rod, the fixed sleeve has a second limiting surface, the second limiting surface is arranged opposite to the first limiting surface, so as to limit the fixed sleeve relative to the drill rod in the rotation direction of the drill rod, and the stirring component is arranged on the outside of the fixed sleeve.

2. The hole agitator for horizontal directional drilling according to claim 1, characterized in that: The stirring assembly includes two stirring components, and the two stirring components are respectively arranged on two opposite sides of the fixing sleeve.

3. The hole agitator for horizontal directional drilling according to claim 2, characterized in that: The stirring member comprises: Two fixing plates, the two fixing plates are spaced apart and arranged on one side of the fixing sleeve, the two fixing plates are arranged opposite to each other, and the fixing plates are provided with fixing holes; A stirring member, wherein a portion of the stirring member is inserted between the two fixing plates, and the stirring member is provided with a positioning hole corresponding to the fixing hole; A latch is inserted into the fixing hole and the positioning hole to connect the fixing plate and the stirring member.

4. The hole agitator for horizontal directional drilling according to claim 3, characterized in that: The stirring member includes a first part and a second part that are connected to each other. At least a portion of the first part is inserted between the two fixing plates and is provided with the positioning hole. The second part is arranged at an angle to the first part.

5. The hole agitator for horizontal directional drilling according to claim 4, characterized in that: The two stirring components are centrally symmetrically arranged about the axis of the drill rod.

6. The hole agitator for horizontal directional drilling according to claim 3, characterized in that: The stirring piece is an angle steel.

7. The hole agitator for horizontal directional drilling according to any one of claims 1 to 6, characterized in that: The stirring assembly includes two fixing sleeves, which are spaced apart along the axial direction of the drill rod. At least a portion of the stirring component extends along the axial direction of the drill rod to connect the two fixing sleeves respectively.

8. The hole agitator for a horizontal directional drilling machine according to any one of claims 1 to 6, characterized in that: A limiting groove is provided on the outer wall of the drill rod, the first limiting surface is located in the limiting groove, and at least a portion of the fixing sleeve is accommodated and limited in the limiting groove.

9. The hole agitator for a horizontal directional drilling machine according to any one of claims 1 to 6, characterized in that: The drill rod is provided with a short section, the short section is in the shape of an octagonal prism, and at least one outer side surface of the short section is the first limiting surface.

10. A horizontal directional drilling rig, characterized in that: include: Equipment body; The hole stirrer for a horizontal directional drill according to any one of claims 1 to 9, wherein the hole stirrer for a horizontal directional drill is connected to the equipment body.

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