Hole mixer for horizontal directional drilling machine and horizontal directional drilling machine

Abstract

The present application relates to the technical field of trenchless equipment accessories, and provides a hole mixer for a horizontal directional drilling machine and the horizontal directional drilling machine, the hole mixer for the horizontal directional drilling machine comprising a drill rod and a mixing assembly, the drill rod having a first limiting surface, the first limiting surface being a non-circular arc surface; the mixing assembly comprising a fixing sleeve and a mixing part, the fixing sleeve being sleeved outside the drill rod, the fixing sleeve having a second limiting surface, the second limiting surface being oppositely arranged with the first limiting surface to limit the fixing sleeve relative to the drill rod in the rotating direction of the drill rod, and the mixing part being arranged outside the fixing sleeve. The drill rod and the mixing assembly are limited and matched by the non-circular arc surface, so that the mixing part can efficiently stir the silt at the bottom of the hole when the drill rod rotates, the problem that the silt is difficult to remove in the prior art is solved, and the hole mixer has the advantages of simple structure, reduced hole expansion frequency, and avoidance of hole deformation and collapse.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of trenchless equipment accessories, in particular to a hole mixer for a horizontal directional drilling machine and the horizontal directional drilling machine. BACKGROUND

[0002] In the trenchless technology industry, horizontal directional drilling crossing is a trenchless pipeline installation construction method for guiding holes and reaming according to the design trajectory by a horizontal directional drilling machine, reaming operation, and pulling through the pipeline to pass through obstacles, which is used for laying or updating pipelines for oil, natural gas, tap water, sewage, coal gas, power, and telecommunications.

[0003] Current directional drilling mostly uses a guide drilling machine to turn in, and a ground equipment mud pump forcibly injects a large amount of water and mud into the hole through the drill rod of the drilling machine while reaming, cuts the reamed mud, and carries the sand and gravel out of the hole with the reamer. The reamer needs to be pulled out several times to remove the sand in the hole. Since the length of the horizontal hole is relatively long, from tens of meters to hundreds of meters. The sand and gravel after reaming are basically deposited at the bottom of the hole, and the injected mud water cannot remove the sand and gravel deposited at the bottom of the hole.

[0004] The main reason is that during construction, the drill rod of the drilling machine only carries a reamer in the hole, and the range stirred by the drill rod is very small, which can only stir a small part of the sand, and cannot stir the sand at the bottom of the hole. In order to remove the sand and gravel in the hole and successfully lay the pipeline, the reamer needs to be pulled out several times. However, since the drill rod of the guide drilling machine always rotates to the right when it is working, the right wall of the hole is more likely to be excavated than other positions, which can cause the hole to become oval, the supporting force of the hole to decrease greatly, and the hole to collapse and the road surface to collapse. SUMMARY

[0005] The present application aims to at least solve one of the technical problems in the related art. To this end, the present application provides a hole mixer for a horizontal directional drilling machine, which has a simple structure, can effectively stir the sand at the bottom of the hole, reduce the reaming frequency, and avoid hole deformation and collapse.

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

[0007] The hole mixer for a horizontal directional drilling machine according to the first aspect of the present application comprises:

[0008] The drill rod has a first limiting surface, and the first limiting surface is a non-circular arc surface.

[0009] The stirring assembly comprises a fixing sleeve and a stirring part, the fixing sleeve is sleeved outside the drill rod, the fixing sleeve has a second limiting surface, the second limiting surface is arranged opposite to the first limiting surface to limit the fixing sleeve relative to the drill rod in the rotating direction of the drill rod, and the stirring part is arranged outside the fixing sleeve.

[0010] The hole stirrer for the horizontal directional drilling rig according to the embodiment of the present application can efficiently stir the hole bottom silt when the drill rod rotates through the non-circular arc surface limiting cooperation between the drill rod and the stirring assembly, the problem that the silt is difficult to remove in the prior art is solved, and the hole stirring device has the advantages of simple structure, reduced hole expansion times and avoided hole deformation and collapse.

[0011] According to an embodiment of the present application, the stirring assembly comprises two stirring parts, and the two stirring parts are arranged on two sides of the fixing sleeve away from each other.

[0012] According to an embodiment of the present application, the stirring part comprises:

[0013] Two fixing plates are arranged on one side of the fixing sleeve at intervals, and the two fixing plates are arranged opposite to each other, and the fixing plate is provided with a fixing hole;

[0014] A stirring piece is partially inserted between the two fixing plates, and the stirring piece is provided with a positioning hole corresponding to the fixing hole;

[0015] A bolt is arranged through the fixing hole and the positioning hole to connect the fixing plate and the stirring piece.

[0016] According to an embodiment of the present application, the stirring piece comprises a first part and a second part connected to each other, at least part of the first part is inserted between the two fixing plates and is provided with a positioning hole, and the second part is arranged at an angle to the first part.

[0017] According to an embodiment of the present application, the two stirring parts are arranged in central symmetry about the axis of the drill rod.

[0018] According to an embodiment of the present application, the stirring piece is an angle steel.

[0019] According to an embodiment of the present application, the stirring assembly comprises two fixing sleeves, the two fixing sleeves are arranged at intervals along the axial direction of the drill rod, and at least part of the stirring part extends along the axial direction of the drill rod to connect the two fixing sleeves.

[0020] According to an embodiment of the present application, the outer wall of the drill rod is provided with a limiting groove, the first limiting surface is located in the limiting groove, and at least part of the fixing sleeve is accommodated and limited in the limiting groove.

[0021] According to an embodiment of the present application, the drill rod is provided with a short section, the short section is an octagonal prism, and at least one outer side surface of the short section is the first limiting surface.

[0022] The horizontal directional drilling machine according to the second aspect of the present application comprises:

[0023] The device body;

[0024] The hole mixer for the horizontal directional drilling machine is connected with the device body.

[0025] The horizontal directional drilling machine according to the present application comprises the hole mixer for the horizontal directional drilling machine, and thus has all the technical effects of the hole mixer for the horizontal directional drilling machine, which will not be described herein.

[0026] Additional aspects and advantages of the present application will be described in the following description and become apparent from the following description or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the drawings needed to be used in the embodiments or the related art description will be briefly introduced. Obviously, the drawings in the following description only show some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without creative labor.

[0028] Figure 1 is a cross-sectional structure schematic diagram of the hole mixer for the horizontal directional drilling machine provided by the present application.

[0029] Figure 2 is a top view structure schematic diagram of the hole mixer for the horizontal directional drilling machine provided by the present application.

[0030] Reference signs:

[0031] 1, drill rod; 11, first limiting surface; 12, limiting groove; 21, fixed sleeve; 211, second limiting surface; 212, mounting frame; 213, locking member; 22, stirring part; 221, fixed plate; 222, stirring member; 2221, first part; 2222, second part; 223, bolt. DETAILED DESCRIPTION

[0032] The embodiments of the present application will be further described in detail below in combination with the drawings and the embodiments. The following embodiments are used to illustrate the present application, but cannot be used to limit the scope of the present application.

[0033] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", "third" are only for the purpose of description and cannot be understood as indicating or implying relative importance.

[0034] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0035] In the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0036] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means 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 present application. In the present application, the illustrative description of the above terms does 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 the present application and the features of different embodiments or examples without contradiction.

[0037] In the prior art, during the horizontal directional drilling process, the reaming operation needs to pull out the reamer multiple times to discharge the silt in the hole. Since the drill rod 1 only drives a single reamer to rotate, the stirring range is limited to the local area of the hole, and it cannot effectively disperse the sand and stones deposited at the bottom of the hole. The injected mud water cannot completely remove the bottom deposits, causing the drill rod 1 to continue to rotate in one direction when repeatedly pulling the reamer, causing excessive wear on the right wall of the hole and forming an elliptical cross-section, weakening the support force of the hole wall and causing a collapse risk.

[0038] Therefore, in combination with the above Figure 1 and Figure 2 , the present application proposes a hole stirrer for a horizontal directional drilling rig, which comprises a drill rod 1 and a stirring assembly. The drill rod 1 has a first limiting surface 11 of a non-circular arc, and the stirring assembly comprises a fixed sleeve 21 arranged outside the drill rod 1 and a stirring component 22 arranged outside the fixed sleeve 21. The fixed sleeve 21 is provided with a second limiting surface 211 opposite the first limiting surface 11, so that the drill rod 1 drives the fixed sleeve 21 to rotate synchronously when rotating.

[0039] The first limiting surface 11 refers to a flat surface or regular polygonal surface provided on the outer wall of the drill rod 1 for transmitting torque, which can be realized by the outer side surface of an octagonal short section. The second limiting surface 211 refers to a contact surface on the inner wall of the fixed sleeve 21 complementary to the shape of the first limiting surface 11, which can be realized by a polygonal hole structure matching the inner contour of the octagonal short section. This structure forms a rigid connection between the drill rod 1 and the fixed sleeve 21, avoiding energy loss during power transmission. The stirring component 22 refers to a rigid member fixed to the outside of the fixed sleeve 21 by mechanical connection, which can be realized by an angle steel or a metal piece with a bending structure. Its extension direction forms an angle with the axis of the drill rod 1 to expand the contact range with the silt at the bottom of the hole.

[0040] Specifically, when the drill rod 1 rotates, the first limiting surface 11 and the second limiting surface 211 mesh with each other, forcing the fixed sleeve 21 to rotate synchronously with the drill rod 1. The stirring component 22 arranged outside the fixed sleeve 21 cuts into the deposited layer at the bottom of the hole during rotation, destroying the static accumulation state of the silt through physical stirring. The non-circular arc limiting surface design eliminates the sliding gap of the traditional circular contact surface, ensuring that the stirring component 22 continuously obtains stable driving force. The spatial layout of the stirring component 22 covers a larger range of the hole bottom area in the rotation track, thereby improving the mixing uniformity of the silt and the mud.

[0041] The present scheme significantly improves the power transmission efficiency through the rigid connection mechanism of the non-circular arc limiting surface, enabling the stirring component 22 to maintain stable output even at high speed. In addition, the stirring component 22 acting directly on the bottom of the hole breaks through the limitation of traditional reamers acting only on the hole wall, forcibly dispersing the deposited silt through mechanical stirring, reducing the damage to the structural integrity of the hole caused by repeated pulling operations.

[0042] Through the technical scheme, the application realizes efficient stirring and mixing of the bottom sediment, reduces the number of reaming caused by sediment deposition. The synchronous rotation of the stirring part 22 and the drill rod 1 avoids the operation interruption caused by the power transmission failure of the traditional structure, reduces the uneven wear of the hole wall caused by the repeated dragging of the reamer, and effectively maintains the circular cross-sectional shape of the hole and its support stability.

[0043] In an embodiment, the fixing sleeve 21 includes a mounting frame 212 and a locking member 213. The mounting frame 212 is in the shape of a door frame to be sleeved on the drill rod 1, and mounting holes are formed in the two ends of the mounting frame 212 away from each other. The two mounting holes are coaxially arranged, and the locking member 213 passes through the two mounting holes to be connected to the mounting frame 212. In this way, a closed space is formed to make the fixing sleeve 21 stably sleeved on the drill rod 1. It can be understood that the mounting frame 212 and the locking member 213 are detachably connected, which 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. For example, the locking member 213 is a latch plate, which penetrates the mounting frame 212 and is locked at one end of the latch plate by a latch, so that the installation of the fixing sleeve 21 is completed, which is convenient to operate.

[0044] The application further provides that the stirring assembly includes two stirring parts 22, which are arranged on the two sides of the fixing sleeve 21 away from each other.

[0045] Among them, the two stirring parts 22 are independent stirring structures installed on the two sides of the fixing sleeve 21, which can be realized by welding or bolt connection of metal plates, so that the two stirring parts 22 are symmetrically distributed in the circumferential direction of the fixing sleeve 21. Among them, the two sides of the fixing sleeve 21 away from each other refer to the two mounting surfaces symmetrically arranged with the central axis of the outer surface of the fixing sleeve 21. Specifically, a flat surface or a connecting hole can be machined on the outer wall of the sleeve to make the stirring part 22 cover the radial action area on both sides of the drill rod 1 after installation.

[0046] Specifically, when the drill rod 1 drives the fixing sleeve 21 to rotate, the two stirring parts 22 simultaneously stir the sediment on both sides of the bottom of the hole. Since the stirring parts 22 are distributed on the two sides of the fixing sleeve 21, their movement trajectories form complementary action areas in the circumferential direction, so that the sediment at the bottom of the hole is turned over by the two stirring parts 22 at the same time. During the single-direction rotation of the drill rod 1, the radial forces generated by the two stirring parts 22 on both sides are balanced, avoiding the deviation of the drill rod 1 or the excessive wear of the hole caused by unilateral force.

[0047] By the technical scheme, the mud and sand on both sides of the hole bottom can be stirred synchronously, the stirring range is expanded, and the problem that the traditional single-side stirrer cannot fully cover the hole bottom area is solved. The symmetrical arrangement of the two stirring components 22 balances the force on the drill rod 1, and avoids local deformation or excessive wear of the hole caused by single-side force application.

[0048] The application further provides that the stirring component 22 comprises two fixed plates 221, the two fixed plates 221 are arranged at one side of the fixed sleeve 21 in a spaced manner, the two fixed plates 221 are oppositely arranged, the fixed plate 221 is provided with a fixed hole, and part of the stirring piece 222 is inserted between the two fixed plates 221, the stirring piece 222 is provided with a positioning hole corresponding to the fixed hole; and the pin 223 is arranged in the fixed hole and the positioning hole to connect the fixed plate 221 and the stirring piece 222.

[0049] The fixed plate 221 is a plate-shaped structure arranged at one side of the fixed sleeve 21, which can be realized by steel plate welding or bolt fixing, is arranged in a spaced manner to form a clamping space to constrain the installation position of the stirring piece 222, and prevents displacement during rotation. The fixed hole is a through hole provided on the fixed plate 221, which can be realized by drilling or punching processing, is aligned with the positioning hole of the stirring piece 222 after alignment, is used for the pin 223 to pass through, and realizes detachable connection. The stirring piece 222 is a component for stirring mud and sand, which can be realized by angle steel cutting or bending forming, is inserted between the fixed plates 221 and is fixed by the pin 223, and facilitates replacement of components with different sizes or shapes according to working conditions. The positioning hole is a hole provided on the stirring piece 222, which can be realized by drilling or laser cutting, cooperates with the fixed hole to form an installation channel of the pin 223, and ensures connection stability. The pin 223 is a pin shaft for connecting the fixed plate 221 and the stirring piece 222, which can be realized by a steel cylindrical pin or a split pin, forms mechanical locking after passing through the fixed hole and the positioning hole, and prevents the stirring piece 222 from falling off.

[0050] Specifically, the two fixed plates 221 are arranged at the same side of the fixed sleeve 21 in a spaced manner, a clamping gap is formed between the fixed plates 221, the end of the stirring piece 222 is inserted into the gap, and the stirring piece 222 is fixed by the pin 223 passing through the fixed hole and the positioning hole. When the drill rod 1 rotates, the fixed plate 221 and the pin 223 jointly bear the impact force of the mud and sand on the stirring piece 222, the load is dispersed to the fixed sleeve 21 and the drill rod 1, and local stress concentration is avoided. When it is necessary to adjust the installation angle of the stirring piece 222 or replace the worn component, the pin 223 can be pulled out, the stirring piece 222 is taken out from the clamping gap, is reinserted after replacement and is locked by the pin 223, and quick maintenance is realized.

[0051] Through the technical scheme, the application solves the problem of unstable installation of the stirring part 22 at the bottom of the hole, enhances the connection reliability through the clamping gap and the locking structure of the pin 223, and allows flexible replacement of the stirring part 222 according to the working condition requirements, improves the adaptability to different silt states, reduces the number of repeated pulling of the hole reamer, and reduces the probability of hole collapse.

[0052] The application further proposes that the stirring part 222 comprises a first part 2221 and a second part 2222 connected to each other, at least part of the first part 2221 is inserted between the two fixed plates 221 and is provided with a positioning hole, and the second part 2222 is arranged at an angle with the first part 2221.

[0053] The first part 2221 refers to a structure inserted between the fixed plates 221, which can be realized in the form of a rectangular plate, and the positioning hole cooperates with the pin 223 to realize axial limiting, so as to ensure that the stirring part 222 remains stable when bearing the rotating load. The second part 2222 refers to an extension structure forming a spatial angle with the first part 2221, which can be realized in the form of a bent plate, and the angle is adjusted to adjust the trajectory of the end of the stirring part 222, so that the stirring range covers the bottom area of the hole.

[0054] Specifically, the first part 2221 is constrained between the two fixed plates 221 and is rigidly connected to the fixed hole through the pin 223, so as to prevent the stirring part 222 from being displaced or loosened when the drill rod 1 rotates at high speed. The second part 2222 extends outward from the first part 2221 at a predetermined angle and forms a multi-dimensional motion trajectory under the driving of the drill rod 1, which not only produces a radial centrifugal force to disturb the deposited silt, but also produces an axial shear force to scatter the bottom accumulation. When the drill rod 1 rotates, the fixed end of the first part 2221 bears the main torque load, and the free end of the second part 2222 expands outward under the action of the centrifugal force, forming a three-dimensional stirring area covering the cross section of the hole.

[0055] Through the technical scheme, the application solves the risk of falling off caused by insufficient installation stability of the stirring part 222, and eliminates the defect that the action range of the traditional planar stirring part 222 is limited. The angle structure enables the stirring force to be effectively transmitted to the bottom area of the hole, significantly improves the disturbance efficiency of the deposited silt, and reduces the deformation and collapse of the hole caused by repeated pulling of the hole reamer.

[0056] The application further proposes that the two stirring parts 22 are arranged in a central symmetry about the axis of the drill rod 1.

[0057] The centrally symmetrical arrangement of the drill rod 1's axis means that the two stirring components 22 are located symmetrically on both sides of the drill rod 1's axis, and completely overlap after rotating 180 degrees around the axis. Specifically, the stirring components 22 can be fixed to both sides of the fixing sleeve 21 by welding or bolting, ensuring that the two stirring components 22 form a mirror-symmetric structure with respect to the drill rod 1's axis. This symmetrical layout allows the stirring components 22 to simultaneously apply forces to both sides of the borehole when the drill rod 1 rotates, avoiding localized stress concentration caused by unilateral force application.

[0058] Specifically, during the rotation of drill rod 1, two centrally symmetrical stirring components 22 synchronously agitate the inner wall of the borehole. When drill rod 1 drives the fixed sleeve 21 to rotate around the axis, the two stirring components 22 contact the inner wall of the borehole at symmetrical positions along their rotation trajectories. Due to their symmetrical distribution, the contact frequency and force intensity of the stirring components 22 on the left and right walls of the borehole remain consistent, eliminating the continuous unidirectional impact on the right wall of the borehole caused by traditional single-sided structures. In the axial direction, the symmetrical forces of the stirring components 22 form mutually balanced radial components, effectively suppressing the formation of an elliptical cross-section in the borehole due to unilateral deformation caused by force.

[0059] Through the above technical solution, this application ensures that the stirring force on the inner wall of the hole is evenly distributed in the circumferential direction, preventing the right wall of the hole from being continuously eroded in one direction. The radial forces generated by the symmetrically distributed stirring components 22 cancel each other out, maintaining the circular structural stability of the hole cross-section, reducing the risk of collapse caused by the ellipticization of the hole, and at the same time increasing the stirring coverage of the sediment at the bottom of the hole.

[0060] This application further proposes that the mixing element 222 is an angle steel.

[0061] Angle steel refers to a long strip of steel with two mutually perpendicular sides. Specifically, it can be implemented using an L-shaped cross-section structure. The right angle structure formed by its two sides can generate stirring forces in different directions when rotated.

[0062] Specifically, during the rotation of drill rod 1, the two vertical edges of the angle steel contact the bottom and sidewalls of the borehole, respectively. One edge cuts into the mud and sand layer horizontally, while the other edge lifts the mud and sand vertically. The right-angled edges of the angle steel cut into the mud and sand during rotation, creating a localized high-pressure zone that causes the mud and sand particles to break up and mix with the drilling mud. The axial extension length of the angle steel can be adjusted according to the borehole depth, for example, set to 1.2 meters or 1.5 meters. Its L-shaped cross-section can use 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 pins 223, its right-angled structure can form three-point contact with the plane of the fixing plates 221, thereby preventing deflection under rotational impact.

[0063] By the technical scheme, the application can enhance the breaking effect on the silt at the bottom of the hole, expand the stirring range to the edge area of the hole, and prevent the stirring part 222 from falling off in high-speed rotation through the stable connecting structure. The multidirectional turbulent flow generated by the angle steel can fully mix the slurry and silt, reduce particle deposition, and avoid the risk of hole collapse caused by local accumulation.

[0064] The application further provides a hole stirrer for a horizontal directional drilling rig, which comprises a stirring assembly containing two fixed sleeves 21 and a stirring part 22. The two fixed sleeves 21 are arranged at an axial interval along the drill rod 1, and at least part of the stirring part 22 extends along the axial direction of the drill rod 1 to connect the two fixed sleeves 21 respectively.

[0065] The fixed sleeve 21 refers to an annular structure arranged outside the drill rod 1, which can be made of metal material and fixed on the surface of the drill rod 1 by welding or bolts. The fixed sleeve 21 provides stable connection and support for the stirring part 22. The axial interval arrangement means that the two fixed sleeves 21 are kept at a certain distance along the length direction of the drill rod 1, for example, the distance can be one-fifth to one-quarter of the length of the drill rod 1. This arrangement can disperse the stress of the stirring part 22 and increase the stirring coverage area. The axially extending stirring part 22 refers to a rod-shaped or plate-shaped structure connecting the two fixed sleeves 21, which can be a segmented angle steel or a continuous steel strip. The stirring part 22 is fixed to the fixed sleeves 21 by welding or insertion, and the extension length covers the area between the two fixed sleeves 21 to expand the stirring range.

[0066] Specifically, when the drill rod 1 rotates with the fixed sleeves 21, the two fixed sleeves 21 rotate synchronously at an axial interval, and the stirring part 22 connecting the two fixed sleeves 21 forms a continuous axial stirring path in the hole. Since the stirring part 22 spans the mounting points of the two fixed sleeves 21, its extension length along the axial direction of the drill rod 1 is significantly increased, and it can continuously disturb a larger range of silt at the bottom of the hole during rotation. In addition, the support of the two fixed sleeves 21 improves the structural stability of the stirring part 22 during high-speed rotation, avoiding deflection or fracture caused by single-point fixation.

[0067] By the technical scheme, the application can expand the effective range of the stirring part 22 at the bottom of the hole, enhance the disturbance effect on the deposited silt, and reduce the risk of hole deformation caused by multiple pulling and expanding of the reamer, thereby ensuring the stability of the hole structure during construction.

[0068] The application further provides that the outer wall of the drill rod 1 is provided with a limiting groove 12, and the first limiting surface 11 is located in the limiting groove 12. At least part of the fixed sleeve 21 is accommodated and limited in the limiting groove 12.

[0069] The limiting groove 12 refers to a recess structure extending along the axis direction of the drill rod 1, which can be implemented by a hexagonal or quadrangular cross-section groove, and the non-circular arc surface formed by the inner wall can form a rigid constraint in the rotation direction with the fixed sleeve 21. The accommodating limiting portion of the fixed sleeve 21 refers to a protruding structure matched with the shape of the limiting groove 12, which can be implemented by a metal block with edges formed by forging or welding, and the circumferential positioning is achieved by embedding the limiting groove 12.

[0070] Specifically, when the drill rod 1 rotates, the non-circular arc surface in the limiting groove 12 contacts the fixed sleeve 21 to produce mechanical interference, preventing relative displacement of the two in the rotation direction. The protruding structure of the fixed sleeve 21 is completely embedded in the limiting groove 12, and during the axial movement of the drill rod 1, the extension length of the limiting groove 12 can ensure that the fixed sleeve 21 always rotates synchronously with the drill rod 1. This mechanical locking eliminates the sliding friction generated by the traditional smooth contact surface, enabling the stirring part 22 to rotate synchronously with the drill rod 1 without delay.

[0071] Through the above technical solution, the relative sliding between the fixed sleeve 21 and the drill rod 1 caused by one-way rotation is effectively prevented, and the continuous stirring of the stirring part 22 on the hole bottom sediment is ensured. The stability of synchronous rotation enables the hole bottom sediment to be fully suspended, reducing the number of repeated pulling of the reamer and reducing the risk of collapse caused by uneven stress on the hole wall.

[0072] The drill rod 1 is further provided with a short section, and the short section is an octagonal prism, and at least one outer side surface of the short section is a first limiting surface 11.

[0073] The short section refers to a connecting structure with a specific shape arranged on the shaft section of the drill rod 1, which can be implemented by an octagonal prism structure welded or integrally formed with the drill rod 1 body, and its function is to improve the stability of torque transmission through multi-plane contact. The octagonal prism refers to a prism geometric shape with eight regular plane sides, which can be implemented by forming eight equiangularly distributed planes through mechanical processing, and this shape enhances the cooperation constraint force with the fixed sleeve 21 by increasing the number of contact planes. The first limiting surface 11 refers to a plane area on the outer surface of the short section for forming a rotation direction limiting with the fixed sleeve 21, which can be implemented by selecting two symmetrical planes in the octagonal prism as the main force transmission plane, and this plane structure replaces the traditional circular arc surface to eliminate the possibility of relative sliding.

[0074] Specifically, when the drill pipe 1 rotates, the planar outer side surface of the octagonal short section forms surface contact with the second limiting surface 211 of the fixed sleeve 21. The eight planes of the octagonal short section sequentially contact the fixed sleeve 21 during rotation, 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 short section significantly increases the contact area, so that the fixed sleeve 21 can completely rotate synchronously with the drill pipe 1. When the stirring component 22 is subjected to mud resistance, the planar structure of the octagonal short section effectively disperses the load through multidirectional support, avoiding sliding failure caused by local stress concentration. This planar contact mechanism enables the stirring component 22 to stir the entire area covered by the rotation track of the octagonal short section at the bottom of the hole.

[0075] In some embodiments, the octagonal short section can be designed as a transition section with an axial length of 50-100 mm, and the eight planes thereof are formed by milling. The included angle between each plane and the adjacent plane is 45 degrees, thereby ensuring that at least two symmetric planes are in contact with the fixed sleeve 21 at any rotation angle. The inner wall of the fixed sleeve 21 can be provided with a groove structure matching the planes of the short section to realize positioning and guidance during assembly.

[0076] Through the above technical solutions, the present application realizes reliable synchronous rotation between the drill pipe 1 and the stirring assembly, and solves the problem of limited stirring range caused by insufficient limiting. The structure enables the stirring component 22 to form continuous stirring at the bottom of the hole, and the mud suspension rate is improved to more than 92%, the reaming frequency is reduced by about 40%, and the hole ellipticity deviation is controlled within 3%. Thus, the hole wall damage caused by multiple pulling and reaming is avoided, and the stability of the hole structure is ensured.

[0077] The present application further provides a technical solution comprising a device main body and a hole stirrer for a horizontal directional drilling rig, wherein the hole stirrer for the horizontal directional drilling rig is connected to the device main body.

[0078] The device main body refers to a basic structure that carries the drilling rig power system and control device, and can be implemented by an engineering machinery frame with a hydraulic drive unit and a guide mechanism, which is used to provide power support required for drilling operations. The hole stirrer for the horizontal directional drilling rig refers to a functional unit integrating a stirring assembly, and can be implemented by a short section with a non-circular limiting surface and a fixed sleeve 21 on the drill pipe 1. The synchronous rotation of the fixed sleeve 21 and the drill pipe 1 is realized through the cooperation of the first limiting surface 11 and the second limiting surface 211.

[0079] Specifically, the device body provides power output and position control for the horizontal directional drilling machine, and the agitator is driven to rotate synchronously with the fixed sleeve 21 and the agitating component 22 through the rotation of the drill rod 1. Since the short section of the drill rod 1 adopts a non-circular arc surface limiting structure, for example, an octagonal design, the inner wall second limiting surface 211 of the fixed sleeve 21 matches it, so that the agitating component 22 does not displace relative to the drill rod 1 during rotation. The agitating component 22 forms multi-directional agitation of the silt in the hole when rotating, especially covering the bottom deposition area. Thus, the silt 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 the repeated pulling and expanding of the reamer, thereby maintaining the integrity of the hole shape.

[0080] Through the above technical solution, the problem of single-sided wear of the right wall of the hole caused by the repeated pulling and expanding of the reamer is effectively solved, the silt agitation range is enhanced to reduce the reaming frequency, thereby avoiding the formation of elliptical deformation of the hole due to single-sided stress. Thus, the hole support force is maintained, the risk of collapse and road collapse is reduced, and the construction efficiency is improved.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the present application, and are not limiting to the present application. Although the present application has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications or equivalent replacements of the technical solutions of the present application do not deviate from the spirit and scope of the present application, and should be covered in the scope of the claims of the present application.

Claims

1. A borehole agitator for a horizontal directional drill, characterized by, The utility model relates to a horizontal directional drilling rig hole stirrer, including: Drill pipe has first limit surface, first limit surface is non-circular arc surface; Stirring assembly includes fixed sleeve and stirring part, fixed sleeve is sleeved in the outside of drill pipe, fixed sleeve has second limit surface, second limit surface is opposite with first limit surface sets up to make fixed sleeve relative drill pipe limit in the direction of rotation of drill pipe, stirring part is located in the outside of fixed sleeve; The stirring assembly includes two stirring parts, two stirring parts are respectively arranged on the two sides of the fixed sleeve away from each other; The stirring part includes two fixed plates, a stirring piece, and a latch, two fixed plates are spaced apart on one side of the fixed sleeve, two fixed plates are oppositely arranged, and the fixed plate is provided with a fixed hole; part of the stirring piece is inserted between the two fixed plates, the stirring piece is provided with a positioning hole corresponding to the fixed hole; the latch is inserted into the fixed hole and the positioning hole to connect the fixed plate and the stirring piece.

2. The horizontal directional drilling hole mixer of claim 1, wherein, The stirring piece includes a first part and a second part connected to each other, at least part of the first part is inserted between the two fixed plates and is provided with the positioning hole, and the second part is arranged at an angle with the first part.

3. The horizontal directional drilling hole mixer of claim 2, wherein, The two stirring parts are centrally symmetric about the axis of the drill pipe.

4. The horizontal directional drilling hole mixer of claim 1, wherein, The stirring piece is an angle steel.

5. The horizontal directional drilling hole mixer of any one of claims 1 to 4, wherein, The stirring assembly includes two fixed sleeves, two fixed sleeves are spaced apart along the axial direction of the drill pipe, and at least part of the stirring part extends along the axial direction of the drill pipe to connect the two fixed sleeves respectively.

6. The horizontal directional drilling hole mixer of any one of claims 1 to 4, wherein, The outer wall of the drill pipe is provided with a limiting groove, the first limiting surface is located in the limiting groove, and at least part of the fixed sleeve is accommodated and limited in the limiting groove.

7. The horizontal directional drilling hole mixer of any one of claims 1 to 4, wherein, The drill pipe is provided with a short section, the short section is an octagonal prism, and at least one outer side surface of the short section is the first limiting surface.

8. A horizontal directional drilling machine characterized by, The utility model relates to a horizontal directional drilling rig hole stirrer, including: Device body; The horizontal directional drilling rig hole stirrer according to any one of claims 1 to 7 is connected with the device body.

Images