Hole cleaner 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 cleaning device for a horizontal directional drilling machine and the horizontal directional drilling machine, and the hole cleaning device for the horizontal directional drilling machine comprises a main shaft and a plurality of hole cleaning assemblies. The multiple hole cleaning assemblies are arranged at intervals in the axial direction of the main shaft, and each hole cleaning assembly comprises a sleeve, two fixing plates and a circular rubber ring. The sleeve is sleeved on the main shaft, the circular rubber ring and the two fixing plates are sleeved outside the sleeve, and the circular rubber ring is clamped between the two fixing plates. Through the main shaft and the multiple hole cleaning assemblies arranged at intervals, silt in holes can be effectively stirred and removed in one-time operation after reaming, hole wall damage caused by repeated dragging of the reamer is reduced, meanwhile, the round rubber ring and the fixing plate are matched to maintain the shape stability of the holes, and the hole cleaning device has the advantages that the hole cleaning efficiency is improved, and the hole deformation risk is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of accessories for trenchless equipment, and particularly to a hole cleaning device for a horizontal directional drill and a horizontal directional drill. Background Art

[0002] In the trenchless technology industry, horizontal directional drilling is a trenchless pipeline installation construction method in which a horizontal directional drill is used to conduct pilot hole and reaming operations according to a designed trajectory, and a pipeline is dragged back through an obstacle, and is used for the laying or renewal of pipelines such as oil, natural gas, tap water, sewage, gas, electricity, and telecommunications.

[0003] Currently, most directional drillings are carried out using a guided drill. In the construction, the traditional method of taking sand and mud out by drilling a vertical shaft is still used. However, due to the difference in the angle between the vertical shaft and the horizontal shaft, using the method of taking sand out by drilling a vertical shaft for taking sand and mud out of a horizontal shaft has very poor effects. The reason is that during drilling and reaming, the sand and stones drilled out always sink under the action of gravity. When drilling a vertical shaft, the drill pipe drives the drill bit to constantly stir the bentonite slurry and sediment at the bottom of the wellbore, and continue to forcibly inject water and slurry into the wellbore, so that most of the sand and stones can be taken out of the wellbore. The sand in the horizontal wellbore also sinks to the bottom of the hole as a whole. When dragging back the reamer, the reamer can only stir a small part of the slurry in the hole, and most of the slurry in the hole cannot be stirred. Moreover, the enlarged hole is larger than the diameter of the reamer, so most of the sediment overflows from the gap between the reamer and the hole behind the reamer, and a large amount of sediment still remains in the hole.

[0004] After the current guided drill construction operation is reamed, in order to smoothly lay the pipeline, the reamer needs to be dragged multiple times to remove some sediment in the hole. However, when the reamer is dragged multiple times, since the drill pipe of the guided drill always drives the reamer to rotate to the right during operation, the probability of the right wall of the hole being dug is much greater than other positions, which will cause the hole to become oval. After the hole becomes oval, the supporting force drops greatly, which will cause the hole to collapse and the road surface to subside.

[0005] When a guided drilling rig reams a hole, due to the different hardness of the underground soil layer structure, it may encounter sandy soil or cohesive soil layer at any time. When reaming the hole, when the reamer encounters a relatively hard cohesive soil layer, the reaming speed slows down, and the reamed hole is basically circular. However, when it encounters a sandy soil layer, the reaming speed increases. At this time, the diameter of the reamed hole is much larger than the diameter of the reamer. In addition, since there is no component to control the swing of the reamer in the hole, the reamer will randomly excavate the soft hole wall in the hole, resulting in the hole not being a straight line and presenting a very curved hole, causing the failure of laying pipelines. Moreover, when the existing guided drilling rig drills a horizontal well, since the sediment in the well is not easy to discharge, the success rate is not high when drilling a large hole to lay a pipeline with a larger diameter. Summary of the Invention

[0006] The purpose of the present application is to provide a hole cleaning device for a horizontal directional drilling rig and a horizontal directional drilling rig, which have the advantages of improving the hole cleaning efficiency and reducing the risk of hole deformation.

[0007] The present application provides a hole cleaning device for a horizontal directional drilling rig, and the technical solution is as follows: including: Main shaft; A plurality of hole cleaning components, the plurality of hole cleaning components are arranged at intervals along the axial direction of the main shaft. The hole cleaning component includes a sleeve, two fixing plates and a circular rubber ring. The sleeve is sleeved on the main shaft, the circular rubber ring and the two fixing plates are both sleeved outside the sleeve, and the circular rubber ring is clamped between the two fixing plates.

[0008] According to an embodiment of the present invention, the fixing plate is a circular fixing plate, and the diameter of the fixing plate is smaller than the diameter of the circular rubber ring.

[0009] According to an embodiment of the present invention, the circular rubber ring is bolted to the fixing plate. According to an embodiment of the present invention, the main shaft includes: Main body section, a plurality of hole cleaning components are installed on the main body section; Installation section, the installation section is arranged at one end of the main body section, and the installation section is an octagonal prism; Threaded section, the threaded section is arranged at the end of the installation section away from the main body section, the threaded section is provided with an external thread, and the threaded section is used to connect with external components; Octagonal sleeve, the octagonal sleeve is sleeved on the installation section and is adapted to move along the axial direction of the installation section, and the octagonal sleeve is adapted to move to cover part of the threaded section, and the octagonal sleeve is used to sleeve at least part of the external component.

[0010] According to an embodiment of the present invention, a plurality of positioning grooves are arranged at intervals along the axial direction of the main body section, and at least part of each sleeve is accommodated and limited in the positioning groove.

[0011] According to an embodiment of the present invention, the installation section is provided with an installation hole, the octagonal sleeve is provided with a positioning hole, and the connecting piece sequentially passes through the positioning hole and the installation hole to connect the octagonal sleeve and the installation section.

[0012] According to an embodiment of the present invention, a connecting portion is provided at one end of the main body section away from the mounting section. A pin hole is formed in the connecting portion, and the connecting portion is used to connect an external component.

[0013] The horizontal directional drill according to the second aspect embodiment of the present invention includes: An equipment main body; A drill pipe, one end of which is connected to the equipment main body; A reamer, one end of which is connected to the end of the drill pipe away from the equipment main body; For the hole cleaning device for the above horizontal directional drill, the main shaft is connected to the end of the reamer away from the drill pipe.

[0014] According to an embodiment of the present invention, the horizontal directional drill includes a power divider, and the main shaft is connected to the reamer through the power divider. According to an embodiment of the present invention, the outer diameter of the circular rubber ring is greater than or equal to the maximum outer diameter of the reamer.

[0015] The horizontal directional drill according to the embodiment of the present invention includes the hole cleaning device for the horizontal directional drill, and thus has all the technical effects of the hole cleaning device for the horizontal directional drill, which will not be elaborated here.

[0016] The additional aspects and advantages of the present invention will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present invention.

[0017] As can be seen from the above, a hole cleaning device and a horizontal directional drill provided by the present application, through the structure of the main shaft and multiple spaced hole cleaning components, can effectively stir and remove the sediment in the hole in one operation after reaming, reduce the damage to the hole wall caused by repeatedly dragging the reamer, and at the same time, the circular rubber ring and the fixing plate cooperate to maintain the stability of the hole shape, having the advantages of improving the hole cleaning efficiency and reducing the risk of hole deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments or related technologies. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a schematic structural diagram of the hole cleaning device for the horizontal directional drill provided by the embodiment of the present invention.

[0020] Figure 2 It is a schematic structural diagram of the fixing plate provided by the embodiment of the present invention.

[0021] Figure 3It is a schematic structural diagram of the circular rubber ring provided by an embodiment of the present invention.

[0022] Figure 4 It is a schematic structural diagram of a hole cleaning device and a hole expanding device for a horizontal directional drill provided by an embodiment of the present invention.

[0023] Figure 5 It is a schematic structural diagram of the connection structure at the connection between the hole cleaning device and the hole expanding device for a horizontal directional drill provided by an embodiment of the present invention.

[0024] Figure 6 It is an axial schematic diagram of the hole cleaning device for a horizontal directional drill provided by an embodiment of the present invention.

[0025] Reference numerals: 100, hole cleaning device for horizontal directional drill; 1, main shaft; 11, main body section; 111, connecting part; 12, installation section; 121, installation hole; 13, threaded section; 14, octagonal sleeve; 141, positioning hole; 2, hole cleaning assembly; 21, sleeve; 22, fixing plate; 23, circular rubber ring; 200, hole expanding device; 300, power divider. Detailed implementation manners

[0026] The following further describes in detail the implementation manners of the present invention in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0027] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the embodiments of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0028] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

[0029] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0030] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments 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 a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0031] In the prior art, the horizontal directional drilling method faces the problem that it is difficult to effectively remove sediment deposition during the lateral reaming operation. Since the sediment in the hole deposits at the bottom under the action of gravity, the traditional hole cleaning method cannot form an effective mud circulation, resulting in a large amount of sediment accumulating behind the reamer 200. Repeatedly dragging the reamer 200 easily causes excessive wear on the right wall of the hole to form an elliptical cross-section, reducing the hole support force and triggering the risk of collapse. At the same time, when reaming in a sandy soil layer, the hole diameter abnormally expands, and the reamer 200 swings out of control, causing the hole to bend and deviate from the designed trajectory, seriously affecting the success rate of pipeline laying.

[0032] It can be understood that using multiple sets of sealing units arranged at intervals can not only expand the hole cleaning coverage area, but also prevent local sediment accumulation through a stepped effect. Finally, it is determined that the synchronous movement of the sealing unit and the main shaft 1 is realized through the sleeve 21 installation structure, and the working stability of the elastic element is ensured by cooperating with the clamping and fixing method.

[0033] Therefore, as Figures 1 to 3 shown, the present application proposes a hole cleaner 100 for a horizontal directional drilling rig, which includes a main shaft 1 and a plurality of hole cleaning components 2. The plurality of hole cleaning components 2 are arranged at intervals along the axial direction of the main shaft 1, and each hole cleaning component 2 includes a sleeve 21, two fixing plates 22 and a circular rubber ring 23. The sleeve 21 is sleeved on the main shaft 1, the circular rubber ring 23 and the two fixing plates 22 are sleeved outside the sleeve 21, and the circular rubber ring 23 is clamped between the two fixing plates 22.

[0034] Among them, the sleeve 21 refers to an annular mounting base for carrying the fixing plate 22 and the circular rubber ring 23. Specifically, it can be sleeved on the surface of the main shaft 1 by an interference fit method and achieve synchronous rotation with the main shaft 1 through a keyway structure. This structure enables the hole cleaning assembly 2 to have axial adjustability to adapt to the hole cleaning requirements of different hole diameters. The fixing plate 22 refers to a rigid support for fixing the circular rubber ring 23. Specifically, a flange structure can be adopted, and a clamping effect is formed through bolt connection. This design can prevent the rubber ring from undergoing axial displacement or radial deformation during rotation. The circular rubber ring 23 refers to an elastic sealing element that directly contacts the hole wall. Specifically, it can be made of nitrile rubber material, and its outer edge extends beyond the edge of the fixing plate 22. This feature enables the rubber ring to produce a continuous scraping effect during rotation, pushing the sediment adhering to the hole wall in a specific direction.

[0035] Specifically, the feature that the outer diameter of the circular rubber ring 23 is larger than that of the fixing plate 22 enables its edge to always be in contact with the hole wall. Multiple hole cleaning assemblies 2 are arranged at intervals along the axial direction to form a stepped hole cleaning structure. After the front assembly removes large particle sediment, the rear assembly can perform secondary cleaning on the remaining sediment. The circular rubber ring 23 is held by the fixing plate 22 to maintain radial stability and produces elastic deformation when contacting the hole wall to compensate for the diameter fluctuation of the hole. When the main shaft 1 does not rotate, during the forward movement of the hole cleaner along with the reamer 200, the sealing effect between the circular rubber ring 23 and the hole wall can push the mud forward to form a directional sand discharge effect.

[0036] Through the above technical solutions, the present application solves the problem of hole deformation caused by sediment deposition during the horizontal reaming operation. The coordinated action of multiple hole cleaning assemblies 2 forms a continuous hole cleaning barrier, effectively preventing sediment from accumulating behind the reamer 200. The elastic contact characteristic of the circular rubber ring 23 can adapt to the hole diameter changes of different soil layers and prevent the hole from bending caused by the swing of the reamer 200. The stepped hole cleaning structure reduces the risk of single-point wear and extends the service life of the hole cleaner. While ensuring the hole cleaning effect, this design avoids the damage to the hole wall caused by dragging the reamer 200 multiple times, significantly improving the success rate of pipeline laying.

[0037] It should be noted that when the reamer 200 performs the pipe-following operation after the reaming is completed, a hole cleaner for a horizontal directional drill can be installed behind the reamer 200. At this time, the reamer 200 no longer continues to ream. In this way, no new reaming sediment is generated in the hole, and the sediment in the hole is removed by the hole cleaner for a horizontal directional drill, effectively preventing sediment from accumulating behind the reamer 200.

[0038] The present application further proposes that the fixing plate 22 is a circular fixing plate 22, and the diameter of the fixing plate 22 is smaller than the diameter of the circular rubber ring 23.

[0039] Among them, the circular fixing plate 22 refers to a circular plate-like structure arranged coaxially with the main shaft 1. Specifically, it can be realized by turning a steel plate to form an outer circular contour to ensure uniform circumferential force during rotation. Among them, the diameter of the fixing plate 22 being smaller than the diameter of the circular rubber ring 23 means that the outer diameter of the rubber ring exceeds the outer edge of the fixing plate 22. Specifically, it can be realized by selecting rubber rings with different diameter specifications and fitting them with the metal fixing plate 22, so that the rubber ring can expand and deform outward when being extruded.

[0040] Specifically, the outer contour of the circular fixing plate 22 is coaxially arranged with the rubber ring. During the movement of the hole cleaning device, the outer edge of the rubber ring always maintains flexible contact with the hole wall. When the hole cleaning assembly 2 is subjected to axial pressure, the rubber ring expands radially under the clamping action of the fixing plate 22. At this time, the part of the rubber ring exceeding the outer edge of the fixing plate 22 forms an elastic scraping band. Since the diameter of the fixing plate 22 is smaller than that of the rubber ring, the rubber ring will not be rigidly restricted by the outer edge of the fixing plate 22 during the deformation process and can adaptively adjust the contact area according to the shape of the hole wall. This structure continuously scrapes the sediment deposits attached to the hole wall through the elastic deformation of the rubber ring on the premise of avoiding rotating and gnawing the hole wall.

[0041] Through the above technical solution, the present application can effectively expand the contact area between the hole cleaning assembly 2 and the hole wall, continuously scrape the hole wall through the elastic deformation of the rubber ring under non-rotating working conditions, and significantly improve the sediment removal efficiency. This structure also avoids the local stress concentration caused by the direct contact between the rigid components and the hole wall, prevents the distortion of the hole shape, and ensures that the hole after the reaming operation maintains a stable cylindrical shape.

[0042] The present application further proposes that the circular rubber ring 23 is bolted to the fixing plate 22.

[0043] Among them, bolt connection refers to mechanically locking the circular rubber ring 23 and the fixing plate 22 with threaded fasteners. Specifically, it can be realized by adopting a structure of multiple groups of bolts and nuts evenly distributed along the circumferential direction, so as to form a detachable rigid connection between the circular rubber ring 23 and the fixing plate 22. This connection method restricts the relative movement between the rubber ring and the fixing plate 22 through the axial pressing force generated by the bolts, and resists the displacement caused by centrifugal force and vibration during the rotating operation.

[0044] Specifically, during the working process of the hole cleaning device, the circular rubber ring 23 undergoes radial compression deformation due to the reaction force of the hole wall. The bolt connection forms multiple-point rigid constraints between the fixing plate 22 and the circular rubber ring 23, preventing the rubber ring from circumferentially slipping due to centrifugal force. The axial pre-tightening force of the bolts can be adjusted according to the elastic modulus of the rubber ring material to ensure that the compression deformation amount of the rubber ring is maintained within a preset range. When encountering hard strata or foreign object impacts, the bolt connection structure disperses the local stress through thread engagement, avoiding plastic deformation or disconnection between the rubber ring and the fixing plate 22.

[0045] Through the above technical solutions, the present application effectively prevents the connection failure between the rubber ring and the fixed plate 22 caused by vibration during dynamic operation, maintains the stability of the rubber ring compression amount, and ensures the continuous and effective contact between the rubber ring and the hole wall during the hole cleaning operation. The bolt connection structure also allows the pre-tightening force to be adjusted according to the working conditions, adapts to the elastic deformation requirements of rubber ring materials with different hardnesses, and extends the service life of the hole cleaning assembly 2.

[0046] As Figure 5 and Figure 6 shown, the present application further proposes that the main shaft 1 includes a main body section 11, a mounting section 12, a threaded section 13 and an octagonal sleeve 14. The main body section 11 is used to install a plurality of hole cleaning assemblies 2; the mounting section 12 is provided at one end of the main body section 11 and is configured as an octagonal prism; the threaded section 13 is provided at the end of the mounting section 12 away from the main body section 11 and is provided with an external thread for connecting to an external component; the octagonal sleeve 14 is sleeved on the mounting section 12 and can move axially, and can partially cover the threaded section 13 to sleeve an external component.

[0047] Among them, the octagonal prism structure of the mounting section 12 refers to a column with an octagonal cross-section, which can be specifically formed by forging or cutting. The torque is transmitted through the contact between the prism surface and the inner wall of the octagonal sleeve 14 to avoid slipping. The external thread of the threaded section 13 refers to a spiral protrusion structure, which can be specifically processed by turning or rolling processes and is used to form a threaded fit with an external component. The octagonal sleeve 14 refers to a sleeve 21 whose inner wall shape matches the octagonal prism of the mounting section 12, and can be manufactured by split casting or machining. The covering area is adjusted by axial movement to wrap the external component interface.

[0048] Specifically, the main body section 11 serves as the installation base of the hole cleaning assembly 2 to achieve modular layout; the octagonal prism structure of the mounting section 12 enhances the anti-torsion ability through prism surface contact and prevents relative sliding during connection. After the threaded section 13 is threadedly connected to an external component, the octagonal sleeve 14 is moved so that it partially covers the threaded section 13 to form axial limitation on the connection part and inhibit thread loosening. The octagonal sleeve 14 also wraps the external component interface at the same time, adapts to connection ends with different sizes or shapes, and ensures connection stability. The octagonal fit between the mounting section 12 and the octagonal sleeve 14 allows the mounting section 12 to be rotated by driving the octagonal sleeve 14 with a tool or by hand, which facilitates the installation and disassembly operations of the threaded section 13.

[0049] Through the above technical solutions, the present application can effectively prevent the loosening of the threaded connection caused by vibration, improve the torque transmission efficiency between the mounting section 12 and the external component, adapt to external interfaces with different sizes or shapes, and ensure the stable connection and reliable operation of the hole cleaner during the reaming operation.

[0050] The present application further proposes that a plurality of positioning grooves are provided at intervals along the axial direction of the main body section 11, and at least a part of each sleeve 21 is received and limited in the positioning grooves.

[0051] Among them, the main body section 11 refers to the part of the main shaft 1 for installing the hole cleaning component 2, which can be specifically implemented by a cylindrical metal shaft body, and a plurality of groove structures are machined on its surface along the length direction. Among them, the positioning grooves refer to the groove structures spaced along the axial direction of the main shaft 1, which can be specifically implemented by U-shaped or rectangular cross-section grooves, and their depth and width are determined according to the size of the sleeve 21. Among them, the sleeve 21 refers to an annular component sleeved outside the main shaft 1, which can be specifically implemented by a metal sleeve 21 with a radial protrusion, and the protruding part matches the shape of the positioning groove.

[0052] Specifically, positioning grooves arranged at intervals are machined on the axial surface of the main body section 11 of the main shaft 1, and a protruding structure that matches the cross-sectional size of the positioning groove is arranged on the inner wall of each sleeve 21. When the sleeve 21 is installed on the main body section 11, the protruding structure is embedded in the corresponding positioning groove to form double limits in the axial and circumferential directions. During the rotation of the main shaft 1, the mechanical engagement between the positioning groove and the protrusion of the sleeve 21 prevents the sleeve 21 from sliding or rotating relative to the main shaft 1, ensuring that the hole cleaning component 2 always maintains a preset distance. This rigid connection method avoids the loosening problem that may occur in traditional bolt fixing, and at the same time realizes the uniform transmission of the hole cleaning force through the interval distribution of the grooves.

[0053] Through the above technical solutions, it is ensured that all components always maintain axial alignment at the preset distance during the hole cleaning operation. The mechanical limit structure between the sleeve 21 and the positioning groove effectively suppresses the circumferential offset and axial sliding, improving the uniformity and stability of the hole cleaning action. In addition, this structure reduces the probability of hole cleaning blind areas caused by component displacement, and at the same time reduces the operation steps of disassembling fasteners during maintenance.

[0054] The present application further proposes to provide an installation hole 121 in the installation section 12, a positioning hole 141 is provided in the octagonal sleeve 14, and a connecting piece sequentially passes through the positioning hole 141 and the installation hole 121 to connect the octagonal sleeve 14 and the installation section 12.

[0055] Among them, the installation hole 121 refers to a through hole distributed along the axial direction of the installation section 12, which can be specifically implemented by mechanical drilling or milling, and its function is to provide a through channel for the connecting piece. The positioning hole 141 refers to a through hole provided on the wall surface of the octagonal sleeve 14, which can be specifically implemented by a hole position layout corresponding to the installation hole 121, and its function is to form an alignment relationship with the installation hole 121. The connecting piece refers to a component with a mechanical connection function, which can be specifically implemented by bolts, pins or plugging rods, and its function is to form a rigid constraint by passing through the installation hole 121 and the positioning hole 141.

[0056] Specifically, when the octagonal sleeve 14 needs to be axially adjusted along the installation section 12, the constraint of the connecting piece can be released to enable the octagonal sleeve 14 to freely move to the target position. At this time, a plurality of mounting holes 121 distributed on the installation section 12 form a corresponding relationship with the positioning holes 141 of the octagonal sleeve 14. By inserting the connecting piece into the selected combination of the mounting hole 121 and the positioning hole 141, the octagonal sleeve 14 and the installation section 12 are mechanically locked. The insertion of the connecting piece not only prevents the axial sliding of the octagonal sleeve 14, but also transmits the torque load through the contact surface of the hole wall, avoiding the circumferential offset of the octagonal sleeve 14 during the connection of external components. Thus, the cooperation between the mounting hole 121 and the positioning hole 141 forms discrete positioning nodes, which not only retains the adjustability of the axial position but also ensures the connection stability after locking.

[0057] Through the above technical solution, the present application realizes the multi-level precise positioning of the octagonal sleeve 14 on the installation section 12, effectively preventing the loosening problem caused by axial displacement during the connection of external components. Among them, the mechanical constraint effect of the connecting piece significantly improves the anti-torsion ability of the octagonal sleeve 14 and the installation section 12, ensuring a stable connection between the external component and the threaded section 13. The discrete positioning hole 141 design further reduces the complexity of equipment maintenance and improves the construction efficiency.

[0058] The present application further proposes that one end of the main body section 11 away from the installation section 12 is provided with a connecting portion 111, the connecting portion 111 is provided with a pin hole, and the connecting portion 111 is used to connect an external component.

[0059] Among them, the connecting portion 111 refers to a structural component located at the end of the main body section 11, which can be specifically formed by forging or machining. Its function is to provide an interface for external components and transmit axial force, and avoid movement interference with the octagonal sleeve 14 of the installation section 12 through spatial isolation. Among them, the pin hole refers to a through hole penetrating the connecting portion 111, which can be specifically formed by drilling or milling. Its function is to achieve mechanical locking by inserting a pin shaft. Compared with threaded connection, it can prevent loosening failure under rotating conditions and at the same time limit the radial displacement.

[0060] Specifically, the connecting portion 111 is arranged at the end of the main body section 11, and its axial position is separated from the installation section 12, so that the movement of the octagonal sleeve 14 along the installation section 12 will not affect the positioning function of the connecting portion 111. The pin hole penetrates both sides of the connecting portion 111. When connecting an external component, locking is completed by inserting a pin shaft into the pin hole. This mechanical locking method does not rely on thread pre-tightening force and will not cause connection loosening due to vibration during rotary operation. As an independent structural component, the machining accuracy of the connecting portion 111 can be controlled separately. For example, the perpendicularity error between the center line of the pin hole and the axis of the main body section 11 can be controlled within 0.05 mm, so as to ensure the coaxiality between the external component and the hole cleaner after installation.

[0061] Through the above technical solution, the present application realizes the rigid connection between the hole cleaner and external components, effectively suppressing the unexpected swing of the equipment in the hole, ensuring the consistency between the axis of the equipment and the center line of the hole during the hole cleaning operation, and avoiding the bending deformation of the hole caused by loose connection. The mechanical lock formed by the pin hole and the pin shaft can withstand high-frequency vibration conditions, preventing sediment from accumulating in the connection gap, thereby improving the hole cleaning efficiency and the success rate of pipeline laying.

[0062] As Figure 4 shown, the present application further proposes a horizontal directional drill, including an equipment main body, a drill pipe, a reamer 2 ** 00**, and a hole cleaner. One end of the drill pipe is connected to the equipment main body, the reamer 2 ** 00** is connected to the other end of the drill pipe, and the main shaft 1 of the hole cleaner is connected to the end of the reamer 2 ** 00**. The drill is configured with a power divider 3 ** 00** to connect the main shaft 1 and the reamer 2 ** 00**, and the outer diameter of the circular rubber ring 23 is set to be not less than the maximum outer diameter of the reamer 2 ** 00**.

[0063] Among them, the power divider 3 ** 00** refers to a transmission separation device connecting the main shaft 1 and the reamer 2 ** 00**, which can be specifically implemented by a gearbox or a clutch structure, and is used to isolate the transmission of the torque generated during the rotation of the reamer 2 ** 00** to the hole cleaner. Among them, the outer diameter of the circular rubber ring 23 not being less than the maximum outer diameter of the reamer 2 ** 00** refers to the matching standard of the radial dimension of the rubber ring, which can be specifically made of elastic rubber material to ensure that the rubber ring forms a surface contact with the hole wall in the hole. Among them, the hole cleaner being connected to the end of the reamer 2 ** 00** means that the two form a series structure along the drilling direction, which can be specifically fixed by a flange or a threaded interface, so that the hole cleaner can follow the reamer 2 ** 00** into the operation area in real time.

[0064] Specifically, after the reamer 2 ** 00** completes reaming, the hole cleaner enters the hole along the main shaft 1 through the transmission isolation of the power divider 3 ** 00**. The circular rubber ring 23 comes into contact and friction with the hole wall, and its elastic deformation ability allows it to adapt to local dimensional changes of the hole, while scraping the sediment attached to the hole wall. The power divider 3 ** 00** enables the hole cleaner and the reamer 2 ** 00** to form a relatively independent motion state, avoiding the vibration generated by the rotation of the reamer 2 ** 00** from directly acting on the hole cleaner. The size setting of the outer diameter of the rubber ring forms an annular sealing band in the hole, preventing sediment from overflowing from behind the hole cleaner and at the same time restricting the excessive expansion of the inner diameter of the hole.

[0065] Through the above technical solution, the present application realizes synchronous removal of the residual sediment in the hole during reaming, preventing the hole from collapsing or deforming into an ellipse due to sediment accumulation. The independent motion mode of the hole cleaner and the reamer 2 ** 00** reduces the damage to the hole wall structure caused by equipment vibration, and the sealing effect of the rubber ring effectively maintains the stability of the inner diameter of the hole. This technical solution is particularly applicable to operations in sandy soil layers, avoiding excessive expansion of the hole caused by sudden changes in reaming speed and improving the success rate of pipeline laying.

[0066] The present application further provides a horizontal directional drill, which includes a power divider 300. The main shaft 1 is connected to the reamer 200 through the power divider 300.

[0067] Among them, the power divider 300 refers to a power distribution device, which can specifically be implemented by a combination of a gear set, a hydraulic system or a clutch, and is used to separate the rotational power of the main shaft 1 and the reamer 200. Since the reamer 200 is connected to the drill pipe, the function of the power divider 300 is to allow the hole cleaning assembly 2 to receive power independently of the reamer 200, avoiding the synchronous rotation of the hole cleaning assembly 2 with the drill pipe, thereby reducing the lateral gouging of the hole wall by the hole cleaning assembly 2.

[0068] Specifically, when the drill pipe drives the reamer 200 to rotate and ream the hole, for example, when the reamer 200 encounters a geological layer with uneven hardness, the power divider 300 can automatically adjust the power output ratio to offset the lateral swing of the reamer 200 caused by the change in geological resistance, ensuring that the reamer 200 advances along the predetermined axis. During this process, the rotational power of the reamer 200 and the propulsion power of the main shaft 1 are decoupled by the power divider 300, avoiding the continuous unilateral gouging of the hole wall by the hole cleaning assembly 2 synchronously rotating with the drill pipe. The power divider 300 enables the hole cleaner and the reamer 200 to form a relatively independent motion state, avoiding the direct action of the vibration generated by the rotation of the reamer 200 on the hole cleaner.

[0069] Through the above technical solutions, the present application solves the problem that the reamer 200 deviates from the straight track due to the lack of a power coordination device. The power distribution function of the power divider 300 enables the reamer 200 to maintain a stable propulsion direction in a geological layer with uneven hardness, avoiding the generation of an oval hole due to the swing of the reamer 200 caused by unilateral force. The power separation design of the reamer 200 and the main shaft 1 further reduces the risk of continuous gouging of the hole wall, thereby reducing the possibility of hole collapse.

[0070] The present application further provides that the outer diameter of the circular rubber ring 23 is greater than or equal to the maximum outer diameter of the reamer 200.

[0071] Among them, the outer diameter of the circular rubber ring 23 refers to the circumferential diameter formed by the connection line of the outermost radial endpoints of the rubber ring, which can specifically be formed by molding with rubber materials. The outer diameter size is designed to match the maximum outer diameter of the reamer 200. This outer diameter size constraint enables the rubber ring to completely cover the gap between the reamer 200 and the hole wall when moving in the hole. Among them, the maximum outer diameter of the reamer 200 refers to the maximum lateral dimension formed after the cutter is deployed in the working state of the reamer 200, which can specifically be implemented by an adjustable cutter head structure. This size serves as the benchmark for the outer diameter of the rubber ring to ensure the coordinated action of the rubber ring and the reamer 200 in the hole.

[0072] Specifically, during the reaming operation in the sandy soil layer, the circular rubber ring 23 moves along with the main shaft 1 and forms a surface contact with the inner wall of the hole. Since the outer diameter of the rubber ring is not less than the maximum outer diameter of the reamer 200, the outer surface of the rubber ring can completely fill the annular gap between the reamer 200 and the hole wall, forcing the sediment to be pushed out by the rubber ring along the flow direction of the mud, thus preventing the sediment from depositing at the bottom of the hole. At the same time, the rubber ring forms a continuous support for the hole wall, restricting the lateral swing of the reamer 200 caused by uneven stress in the soft soil layer, thereby constraining the reamer 200 to move along the predetermined trajectory and avoiding the bending of the hole. In addition, the matching relationship between the outer diameter of the rubber ring and the size of the reamer 200 limits the diameter of the hole formed by reaming within a range close to the maximum outer diameter of the reamer 200, preventing the abnormal expansion of the hole diameter and the resulting decrease in the supporting force of the hole wall.

[0073] Through the above technical solution, the present application solves the problem of abnormal expansion of the hole diameter caused by sediment retention during reaming in the sandy soil layer, avoids the bending of the hole caused by the lateral swing of the reamer 200, and at the same time enhances the supporting force of the hole wall by maintaining the regularity of the hole diameter, preventing the collapse of the hole.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those of ordinary skill in the art should understand that various combinations, modifications or equivalent replacements 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 should all be covered by the scope of the claims of the present invention.

Claims

1. A hole cleaning device for a horizontal directional drill, characterized in that, Comprising: Spindle; A plurality of hole cleaning components, the plurality of hole cleaning components are arranged at intervals along the axial direction of the spindle. The hole cleaning component includes a sleeve, two fixing plates and a circular rubber ring. The sleeve is sleeved on the spindle, the circular rubber ring and the two fixing plates are both sleeved outside the sleeve, and the circular rubber ring is clamped between the two fixing plates.

2. The hole cleaning device for a horizontal directional drill according to claim 1, characterized in that, The fixing plate is a circular fixing plate, and the diameter of the fixing plate is smaller than the diameter of the circular rubber ring.

3. The hole cleaning device for a horizontal directional drill according to claim 1, wherein, The circular rubber ring is bolted to the fixing plate.

4. The hole cleaning device for a horizontal directional drill according to any one of claims 1 to 3, characterized in that, The spindle includes: A main body section, on which the plurality of hole cleaning components are installed; An installation section, which is arranged at one end of the main body section. The installation section is octagonal prism-shaped; A threaded section, which is arranged at one end of the installation section far from the main body section. The threaded section is provided with an external thread, and the threaded section is used for connecting with an external component; An octagonal sleeve, which is sleeved on the installation section and is adapted to move along the axial direction of the installation section, and the octagonal sleeve is adapted to move to cover part of the threaded section. The octagonal sleeve is used for sleeving at least part of the external component.

5. The hole cleaning device for a horizontal directional drill according to claim 4, characterized in that, A plurality of positioning grooves are arranged at intervals along the axial direction of the main body section, and at least part of each sleeve is received and limited in the positioning groove.

6. The hole cleaning device for a horizontal directional drill according to claim 4, characterized in that, The installation section is provided with an installation hole, and the octagonal sleeve is provided with a positioning hole. A connecting piece passes through the positioning hole and the installation hole in sequence to connect the octagonal sleeve and the installation section.

7. The hole cleaning device for a horizontal directional drill according to claim 4, characterized in that, One end of the main body section far from the installation section is provided with a connecting portion, and the connecting portion is provided with a pin hole. The connecting portion is used for connecting an external component.

8. A horizontal directional drill, characterized in that, Comprising: Equipment main body; A drill pipe, one end of which is connected to the equipment main body; A reamer, one end of which is connected to the end of the drill pipe far from the equipment main body; The hole cleaner for a horizontal directional drill as described in any one of claims 1 to 7, the spindle is connected to the end of the reamer far from the drill pipe.

9. The horizontal directional drill according to claim 8, wherein, The horizontal directional drill includes a power divider, and the spindle is connected to the reamer through the power divider.

10. The horizontal directional drill according to claim 8, characterized in that, The outer diameter of the circular rubber ring is greater than or equal to the maximum outer diameter of the reamer.

Images