Reducing reamer 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 variable-diameter reamer for a horizontal directional drilling machine and the horizontal directional drilling machine. The variable-diameter reamer for the horizontal directional drilling machine comprises a main shaft, a first positioning block, a second positioning block and a plurality of supporting rods, and the main shaft is detachably sleeved with the first positioning block; the second positioning block detachably sleeves the main shaft, the second positioning block and the first positioning block are arranged at an interval, and the diameter of the second positioning block is smaller than that of the first positioning block; the multiple supporting rods are arranged in the circumferential direction of the main shaft at intervals, one end of each supporting rod is detachably connected with the first positioning block, the other end of each supporting rod is detachably connected with the second positioning block, and teeth are arranged on the sides, away from the main shaft, of the supporting rods. And through the detachable first positioning block, the second positioning block and the supporting rod structure, the reaming diameter is flexibly adjusted, so that the construction efficiency is improved, and the construction cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of accessories for trenchless equipment, and particularly to a variable-diameter reamer 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 that uses a horizontal directional drill to conduct pilot hole and reaming operations according to a designed trajectory, and drags and crosses a pipeline through an obstacle, which is used for the laying or renewal of pipelines such as oil, natural gas, tap water, sewage, gas, electricity, and telecommunications.

[0003] After the current guiding drill construction operation is reamed, in order to smoothly lay the pipeline, it is necessary to drag the reamer multiple times to remove some sediment in the hole. In the related art, when reaming, it is usually necessary to gradually increase the size of the reamer and perform multiple reaming operations. In this way, the reamer needs to be replaced multiple times, and the reamer is heavy and not easy to replace. Summary of the Invention

[0004] The purpose of the present application is to provide a horizontal directional drill and a variable-diameter reamer for a horizontal directional drill, which have the advantages of conveniently replacing the diameter of the reamer to improve construction efficiency.

[0005] The present application provides a variable-diameter reamer for a horizontal directional drill, and the technical solution is as follows: A variable-diameter reamer for a horizontal directional drill, comprising: A main shaft; A first positioning block, which is detachably sleeved on the main shaft; A second positioning block, which is detachably sleeved on the main shaft and is spaced apart from the first positioning block, and the diameter of the second positioning block is smaller than that of the first positioning block; A plurality of support rods, which are arranged at intervals along the circumferential direction of the main shaft. One end of each support rod is detachably connected to the first positioning block, and the other end is detachably connected to the second positioning block. Teeth are provided on the side of the support rod facing away from the main shaft.

[0006] According to an embodiment of the present invention, there is an active interval between the support rod and the first positioning block.

[0007] According to an embodiment of the present invention, the main shaft includes a first shaft section and a second shaft section, the first shaft section is detachably connected to the second shaft section, the first positioning block is sleeved on the first shaft section, the second positioning block is sleeved on the second shaft section, and an octagonal sleeve is sleeved between the first shaft section and the second shaft section.

[0008] According to an embodiment of the present invention, the first shaft section is provided with a mounting hole, the octagonal sleeve is provided with a positioning hole, and a connecting member sequentially passes through the positioning hole and the mounting hole to connect the octagonal sleeve and the first shaft section.

[0009] According to an embodiment of the present invention, the outer surface of the octagonal sleeve is provided with anti-slip patterns. According to an embodiment of the present invention, one end of the support rod is hinged to the first positioning block, and the other end is hinged to the second positioning block.

[0010] According to an embodiment of the present invention, the extending direction of the support rod is arranged at an angle with the axial direction of the main shaft.

[0011] According to an embodiment of the present invention, the first positioning block is provided with a water storage space and a water spraying hole communicating with the water storage space, and the water spraying hole is located on the side of the first positioning block facing the second positioning block.

[0012] According to an embodiment of the present invention, the first positioning block is provided with a plurality of water spraying holes, and the plurality of water spraying holes are arranged at intervals around the main shaft.

[0013] The horizontal directional drill according to the second aspect embodiment of the present invention includes: The equipment main body; The drill pipe, one end of the drill pipe is connected to the equipment main body; The variable-diameter reamer for the above horizontal directional drill, the main shaft is connected to the drill pipe.

[0014] The horizontal directional drill according to the embodiment of the present invention includes the variable-diameter reamer for the horizontal directional drill as described above, and thus has all the technical effects of the variable-diameter reamer for the horizontal directional drill as described above, which will not be elaborated herein.

[0015] The additional aspects and advantages of the present invention will be partly given in the following description, partly will become obvious from the following description, or be understood through the practice of the present invention.

[0016] As can be seen from the above, a horizontal directional drill and a variable-diameter reamer for a horizontal directional drill provided by the present application realize flexible adjustment of the reaming diameter through the detachable first positioning block, second positioning block and support rod structure, thereby improving the construction efficiency and reducing the construction cost. BRIEF DESCRIPTION OF THE DRAWINGS [[ID=Z31]]

[0017] 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.

[0018] Figure 1 It is a schematic structural diagram of a variable-diameter reamer for a horizontal directional drill provided by an embodiment of the present invention.

[0019] Figure 2It is an axial structure schematic diagram of a variable-diameter reamer for a horizontal directional drill provided by an embodiment of the present invention.

[0020] Figure 3 It is a connection structure schematic diagram at the eight-sided sleeve provided by an embodiment of the present invention.

[0021] Reference numerals: 1, main shaft; 11, first shaft section; 12, second shaft section; 13, eight-sided sleeve; 31, first positioning block; 311, water spray hole; 32, second positioning block; 33, support rod; 331, tooth. Detailed implementation manners

[0022] The following further describes the implementation manners of the present invention in detail with reference to 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.

[0023] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is 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", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0024] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly defined 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.

[0025] In the embodiments of the present invention, unless otherwise clearly defined and limited, the first feature being "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 indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature has a lower horizontal height than the second feature.

[0026] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc., mean 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 expressions 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.

[0027] In the prior art, trenchless pipeline construction requires multiple operations of changing reamers of different sizes to complete multi-stage reaming operations. Due to the fixed overall structure and large weight of the reamer, the frequent disassembly and assembly of equipment during construction reduces the operation efficiency, and at the same time increases the labor intensity of operators and equipment wear. Especially in complex geological conditions, when it is necessary to dynamically adjust the hole diameter according to the actual working conditions, the traditional reamer is difficult to meet the flexible adjustment requirements, resulting in an extended construction period and increased costs.

[0028] Therefore, as Figure 1 shown, the present application proposes a variable-diameter reamer for a horizontal directional drill, which includes a main shaft 1, a first positioning block 31, a second positioning block 32, and a plurality of support rods 33. The first positioning block 31 is detachably sleeved on the main shaft 1, the second positioning block 32 is detachably sleeved on the main shaft 1 and is arranged at an interval from the first positioning block 31, and the diameter of the second positioning block 32 is smaller than that of the first positioning block 31. The plurality of support rods 33 are arranged at intervals along the circumferential direction of the main shaft 1. One end of each support rod 33 is detachably connected to the first positioning block 31, and the other end is detachably connected to the second positioning block 32. A tooth 331 is provided on the side of the support rod 33 away from the main shaft 1.

[0029] Among them, the main shaft 1 refers to the axial support component that bears the positioning block and the support rod 33 assembly. Specifically, it can be realized by using a high-strength alloy steel shaft body, providing structural rigidity and torque transmission function for the entire reamer. The first positioning block 31 refers to an annular member installed at the front section of the main shaft 1. Specifically, it can be realized by using a split clamp structure, and the expansion angle of the support rod 33 is changed by adjusting its axial position. The second positioning block 32 refers to an annular member with a diameter smaller than that of the first positioning block 31. Specifically, it can be realized by using an adjustable sliding sleeve structure, and the inclination of the support rod 33 is controlled by the change in the distance between it and the first positioning block 31. The support rod 33 refers to a rigid connecting rod connecting the two positioning blocks. Specifically, it can be realized by using a hinged connection structure, and the tooth 331 provided on its outer side can be replaced with cutting heads of different shapes.

[0030] Specifically, the overall diameter of the reamer can be changed by replacing the first positioning block 31 with a larger size, without replacing the entire reamer, which is convenient for installation and disassembly. Through the above technical solution, the present application successfully solves the problem of frequent equipment replacement caused by the fixed size of the traditional reamer, and significantly improves the efficiency of the reaming operation. By simply adjusting the mechanical structure, multi-stage aperture coverage can be achieved, reducing the equipment transportation and storage costs, and at the same time reducing the labor intensity of the operator, providing reliable technical support for trenchless construction under complex working conditions.

[0031] The present application further proposes that there is an active interval between the support rod 33 and the first positioning block 31.

[0032] Among them, the active interval refers to an adjustable gap or elastic connection structure reserved between the support rod 33 and the first positioning block 31, and specifically, it can be achieved by setting an annular gasket or a spring assembly at the connection end of the support rod 33. This gap or elastic structure allows the support rod 33 to produce a small displacement in the axial or radial direction, thereby dispersing the concentrated load of the formation resistance on the support rod 33 during the reaming operation. Among them, the design of the active interval enables the support rod 33 to more flexibly disengage from the first positioning block 31 during disassembly or replacement, avoiding the jamming problem caused by interference fit.

[0033] Specifically, the active interval enables the connection between the support rod 33 and the first positioning block 31 to have an adaptive adjustment ability by setting a gap or an elastic element. When the reamer is working and the formation resistance is applied to the support rod 33, the support rod 33 can make a small offset by means of the allowance of the active interval, reducing the stress peak value at the connection part. When it is necessary to replace the first positioning block 31 with a larger diameter, the installation position of the support rod 33 does not need to be readjusted, and the allowance of the active interval can compensate for the installation tolerance of different size positioning blocks. Thus, the disassembly and assembly efficiency between the support rod 33 and the positioning block is improved, and the main shaft 1 does not need to be disassembled as a whole during the maintenance process.

[0034] Through the above technical solution, the present application solves the problem of difficult disassembly and assembly caused by the fixed connection between the support rod 33 and the positioning block in the traditional reamer. The introduction of the active interval enables the support rod 33 to adaptively deform during the operation, avoiding the fracture of the connection part due to stress concentration, and at the same time simplifies the replacement process of different size positioning blocks, reducing the maintenance downtime.

[0035] Please refer to Figure 1 and Figure 3 Combined, the present application further proposes that the main shaft 1 includes a first shaft section 11 and a second shaft section 12, the first shaft section 11 and the second shaft section 12 are detachably connected, the first positioning block 31 is sleeved on the first shaft section 11, the second positioning block 32 is sleeved on the second shaft section 12, and an octagonal sleeve 13 is sleeved between the first shaft section 11 and the second shaft section 12.

[0036] Among them, the first shaft section 11 refers to the part of the main shaft 1 close to the drill pipe driving end. Specifically, it can be forged from high-strength alloy steel, and its surface is heat-treated to enhance wear resistance. Its length can be set to different sizes according to the reaming requirements, such as 200 mm to 500 mm. By adjusting the shaft section length, the distance between the positioning blocks can be changed. The second shaft section 12 refers to the extended part of the main shaft 1 away from the driving end. Its diameter is the same as that of the first shaft section 11 to ensure coaxiality. A coolant channel can be provided inside, and a keyway is machined on the outer surface for cooperation with the octagonal sleeve 13. The detachable connection means that a flange and bolt combination structure is used to fix the two shaft sections. A positioning pin hole is provided on the end face of the flange to ensure quick alignment with the central axis during assembly. The octagonal sleeve 13 refers to an annular sleeve with a regular octagonal cross-section on the inner circle. It is made of quenched steel, and the inner hole has an interference fit with the outer diameters of the first shaft section 11 and the second shaft section 12.

[0037] Specifically, the first shaft section 11 and the second shaft section 12 are connected by flange bolts to form a split main shaft 1 structure. The operator can remove the bolts and separate the two shaft sections to replace the worn first positioning block 31 or the second positioning block 32 separately. The octagonal sleeve 13 is sleeved at the connection of the two shaft sections. By using the tight fit between its octagonal inner hole and the outer wall of the shaft section, it ensures that the two shaft sections remain coaxial during rotation and avoids vibration caused by eccentricity. When the distance between the positioning blocks needs to be adjusted, only the first shaft section 11 or the second shaft section 12 with different lengths needs to be replaced. For example, replacing the original shaft section with a version that is 300 mm longer can expand the reaming diameter range after the support rod 33 is deployed. During maintenance, by applying a rotational force to the outer surface of the octagonal sleeve 13, the first shaft section 11 and the second shaft section 12 can be quickly disassembled.

[0038] Through the above technical solutions, the present application realizes the modular transformation of the reamer main shaft 1, solves the problems of complex replacement and difficult maintenance of the traditional structure, makes the adjustment of the distance between the positioning blocks more flexible, and reduces the time cost of equipment replacement and maintenance. The split shaft section design allows damaged parts to be replaced separately, avoiding the scrapping of the entire main shaft 1 due to local wear and extending the service life of the equipment. The application of the octagonal sleeve 13 further improves the connection stability and disassembly and assembly efficiency of the shaft sections, ensuring the reliability of power transmission during the reaming operation.

[0039] The present application further proposes that the first shaft section 11 is provided with a mounting hole, and the octagonal sleeve 13 is provided with a positioning hole. The connecting piece sequentially passes through the positioning hole and the mounting hole to connect the octagonal sleeve 13 and the first shaft section 11.

[0040] Among them, the installation hole refers to a through-hole structure that radially penetrates along the first shaft section 11. Specifically, it can be realized by drilling. Its aperture matches the size of the connecting piece and is used to provide a penetration channel for the connecting piece. The positioning hole refers to a through-hole opened on the side wall of the octagonal sleeve 13. Specifically, it can be processed by milling. Its position corresponds to that of the installation hole and is used to ensure accurate positioning when the connecting piece passes through. The connecting piece refers to a fastening element that can be inserted into the installation hole and the positioning hole. Specifically, it can be realized by a bolt or a pin, and axial fixation is completed through threaded connection or interference fit.

[0041] Specifically, during the assembly process, first, the octagonal sleeve 13 is sleeved between the first shaft section 11 and the second shaft section 12. The position of the octagonal sleeve 13 is adjusted so that the positioning hole is coaxially aligned with the installation hole. Subsequently, the connecting piece is inserted to complete the mechanical locking of the two. This connection method forms a rigid constraint through hole position matching, preventing circumferential or axial displacement of the octagonal sleeve 13 and the shaft section during operation. At the same time, the detachable characteristic of the connecting piece facilitates the rapid disassembly of the components during subsequent maintenance.

[0042] Through the above technical solution, the present application realizes the reliable connection and convenient disassembly of the octagonal sleeve 13 and the first shaft section 11, effectively preventing the component deflection problem caused by connection loosening during the reaming operation. At the same time, it improves the component maintenance efficiency and reduces the equipment downtime caused by frequent replacement.

[0043] The present application further proposes to provide anti-slip patterns on the outer surface of the octagonal sleeve 13.

[0044] Among them, the anti-slip pattern refers to a regular or irregular surface concavo-convex structure formed by mechanical processing. Specifically, it can be realized by knurling or laser engraving processes. The groove depth can be 0.1 - 0.5 millimeters, and micro friction resistance is generated by changing the surface topography.

[0045] Specifically, when the operator assembles or disassembles the octagonal sleeve 13, this pattern structure generates resistance in both the axial and radial dimensions. Even if there is oil or water stain on the surface, local gripping points can still be formed through the pattern gaps to maintain stable operation. The processing depth of the anti-slip pattern needs to meet the surface strength requirements to avoid stress concentration caused by too deep patterns.

[0046] Through the above technical solution, the present application solves the problem of slipping caused by the smooth surface when grasping the octagonal sleeve 13, enabling the operator to stably control the sleeve when applying a rotational torque and ensuring that the detachable connection function between the octagonal sleeve 13 and the main shaft 1 is not affected.

[0047] Please refer to Figure 1 and Figure 2 , the present application further proposes that one end of the support rod 33 is hinged to the first positioning block 31, and the other end is hinged to the second positioning block 32.

[0048] Among them, hinged connection means that the rotating connection between the support rod 33 and the positioning block is realized through a pin shaft or a bearing. Specifically, it can be achieved by setting an ear plate on the side of the positioning block and opening a through hole at the end of the support rod 33. The hinged structure enables the support rod 33 to freely rotate around the connection point, forming a variable-angle support structure.

[0049] Specifically, when the reaming diameter needs to be adjusted, the support rod 33 rotates synchronously around the hinged points at both ends, driving the whole support rod 33 to expand outward or contract inward. The extension angle of the support rod 33 is automatically adjusted with the rotation angle of the hinged point, and the diameter-changing operation can be completed without disassembling any connecting components. During the reaming operation, the hinged structure not only maintains the rigid connection state between the support rod 33 and the positioning block, but also allows the support rod 33 to make adaptive fine adjustments according to the changes in geological conditions.

[0050] Through the above technical solution, the present application realizes the rapid on-line adjustment of the angle of the support rod 33 of the reamer, eliminates the operation steps of disassembling the fixing bolts, and reduces the number of tool replacements. The hinged structure of the support rod 33 enables the diameter-changing process to be completed without interrupting the construction, effectively shortening the downtime of the reaming operation and reducing the labor intensity of the operators.

[0051] Please refer to Figure 1 and Figure 2 , the present application further proposes that the support rod 33 extends obliquely along the circumferential direction relative to the main shaft 1, that is to say, the extension direction of the support rod 33 forms an angle with the axis direction of the main shaft 1, and the axis of the support rod 33 and the axis of the main shaft 1 are not in the same plane.

[0052] Among them, the extension direction forming an angle with the axis direction means that the support rod 33 forms a non-vertical inclination angle relative to the axis of the main shaft 1. Specifically, it can be achieved by misaligning the hinged points at both ends of the support rod 33 with the first positioning block 31 and the second positioning block 32, and a predetermined angle is formed by adjusting the circumferential position of the hinged point. Among them, the axis of the support rod 33 and the axis of the main shaft 1 not being in the same plane means that the support rod 33 forms a three-dimensional inclination relationship relative to the axis of the main shaft 1 in space. Specifically, it can be achieved by staggering the circumferential distribution of the hinged points of adjacent support rods 33 along the main shaft 1, forming a spiral distribution structure around the main shaft 1.

[0053] Specifically, when the main shaft 1 drives the variable-diameter reamer to rotate, the obliquely arranged support rod 33 unfolds outward under the action of centrifugal force, and its teeth 331 contact the hole wall at an inclined angle. Since the extension direction of the support rod 33 forms a dynamic angle with the rotation direction, the radial component force generated by the support rod 33 during rotation can continuously abut against the hole wall, forming a constraint on the lateral movement of the reamer.

[0054] The present application further proposes that the first positioning block 31 is provided with a water storage space and a water spraying hole 311 communicating with the water storage space, and the water spraying hole 311 is located on the side of the first positioning block 31 facing the second positioning block 32.

[0055] Among them, the water storage space refers to an internal cavity structure for storing water flow, which can be specifically realized by arranging a cylindrical cavity with a sealing cover inside the first positioning block 31. This cavity is configured to achieve continuous water replenishment through an external water supply pipeline. The function of the water storage space is to provide a stable water source for the water spraying hole 311 to avoid the failure of silt cleaning caused by the interruption of water flow. Among them, the water spraying hole 311 refers to a through-hole structure for directional water spraying, which can be specifically realized by a conical hole with a diameter of 2-5 mm. The axis of the hole forms an angle of 30-60 degrees with the axis of the main shaft 1. The position of the water spraying hole 311 is set in the edge area of the end face of the first positioning block 31 facing the second positioning block 32, so that the water flow is sprayed along the combined direction of the axial and radial directions of the reamer to achieve scouring of the sediment accumulated at the gap of the positioning blocks.

[0056] Specifically, during the reaming operation, the water flow in the water storage space continuously sprays out from the water spraying hole 311 under the drive of pressure. Since the water spraying hole 311 is arranged on the side of the first positioning block 31 facing the second positioning block 32, the sprayed water flow forms a scouring zone distributed along the axial direction of the reamer, covering the working surface of the connection area between the support rod 33 and the positioning block. For example, when the reamer rotates, the water flow forms a fan-shaped spraying surface under the action of centrifugal force, and the sediment particles generated by cutting are washed away from the gaps of the teeth 331 of the support rod 33. This water flow path design avoids the risk of hole collapse caused by directly impacting the hole wall, and at the same time transports the sediment particles to the area behind the drill pipe through hydraulic action and finally discharges them out of the hole with the mud circulation system.

[0057] Through the above technical solution, the present application realizes the real-time removal of sediment during the operation of the reamer, solves the problem of equipment jamming caused by sediment accumulation in the connection area between the positioning block and the support rod 33, reduces the number of disassembly and replacement times of the reamer during the construction process, and improves the laying efficiency of the trenchless pipeline.

[0058] The present application further proposes that the first positioning block 31 is provided with a plurality of water spraying holes 311, and the plurality of water spraying holes 311 are arranged at intervals around the main shaft 1.

[0059] Among them, the multiple water spray holes 311 refer to the hole structure formed by annular array on the side of the first positioning block 31 facing the second positioning block 32, which can be directly formed by drilling process or casting process specifically. Its quantity and aperture can be adjusted according to the actual working conditions. This feature expands the flushing range by increasing the density of water outlet points. Among them, being arranged at intervals around the main shaft 1 means that the water spray holes 311 are evenly distributed at equal angles along the circumferential direction of the main shaft 1. Specifically, a uniform interval central angle arrangement method can be adopted. For example, the adjacent water spray holes 311 are spaced 30 degrees to 60 degrees apart. This feature eliminates the flushing blind area through symmetric layout.

[0060] Specifically, during the rotation of the reamer, the water flow in the water storage space is ejected outward through the multiple water spray holes 311 evenly distributed at equal angles. Since the water spray holes 311 are evenly arranged along the circumferential direction, the water flow forms a continuous annular flushing belt under the action of centrifugal force, scouring and covering the entire circumference of the inner wall of the drill hole. When the reamer advances forward, the multiple water flows generated by the water spray holes 311 continuously impact the sediment adhering to the hole wall, and at the same time, the water flow diffuses along the axial direction to form a laminar flow scouring effect. Compared with single-sided or local water spraying, this annular uniform water flow pattern can break up the sediment accumulation at different positions and avoid sediment caking caused by insufficient flushing in local areas.

[0061] Through the above technical solution, the present application realizes the full-circumference uniform flushing of the inner wall of the drill hole, effectively breaks up the sediment adhering at different angles, and avoids the problem of sediment caking caused by insufficient local flushing. Thereby, the number of rework times caused by incomplete hole cleaning during the reaming process is reduced, the continuity of the reaming operation is improved, and at the same time, the operation requirement of frequently replacing the reamer is reduced.

[0062] The present application further proposes a horizontal directional drill, including an equipment main body, a drill pipe, and a variable-diameter reamer for horizontal directional drill. One end of the drill pipe is connected to the equipment main body, and the main shaft 1 of the variable-diameter reamer is connected to the other end of the drill pipe.

[0063] Among them, the equipment main body refers to the mechanical device that provides power output. Specifically, a hydraulic motor or an electric motor can be used as the power source. Its function is to provide driving force for the rotation of the drill pipe and the reaming operation. Among them, the drill pipe refers to the hollow rod that transmits torque. Specifically, a steel pipe body with segmented threaded connection can be used. Its function is to transmit the rotational power of the equipment main body to the reamer. Among them, the main shaft 1 of the variable-diameter reamer refers to the core shaft body that bears the positioning block and the support rod 33. Specifically, an alloy steel shaft with key grooves on the surface can be used. Its function is to realize power transmission through rigid connection with the drill pipe and support the radial adjustment of the reaming structure.

[0064] Specifically, when the device main body drives the drill pipe to rotate, the torque is transmitted through the drill pipe to the main shaft 1 of the variable-diameter reamer, driving the main shaft 1 and the positioning block and the support rod 33 mounted thereon to rotate synchronously. The teeth 331 on the support rod 33 cut the hole wall during rotation, and by adjusting the distance between the first positioning block 31 and the second positioning block 32 or the inclination angle of the support rod 33, the working diameter of the reamer can be changed. Since the variable-diameter function of the reamer is integrated at the end of the drill pipe, the hole diameter adjustment can be completed without disassembling the drill pipe during construction, thus avoiding the shutdown operation caused by replacing the reamer with a fixed size in traditional operations. The connection mode between the main shaft 1 and the drill pipe can adopt a flange or a threaded interface to ensure the stability of power transmission.

[0065] Through the above technical solution, the present application solves the problem of frequent replacement caused by the fixed size of the reamer in the construction of horizontal directional drilling rigs. By integrating the direct connection of the adjustable reaming structure and the drill pipe, the dynamic adjustment of the hole diameter during the reaming operation is realized, reducing the number of equipment replacements and downtime, and improving the continuity and efficiency of the variable-diameter reaming operation.

[0066] 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 within the scope of the claims of the present invention.

Claims

1. A variable-diameter reamer for a horizontal directional drill, characterized in that Comprising: Main shaft; First positioning block, which is detachably sleeved on the main shaft; Second positioning block, which is detachably sleeved on the main shaft and is arranged at an interval from the first positioning block, and the diameter of the second positioning block is smaller than that of the first positioning block; Multiple support rods, which are arranged at intervals along the circumferential direction of the main shaft. One end of each support rod is detachably connected to the first positioning block, and the other end is detachably connected to the second positioning block. Teeth are provided on the side of the support rod facing away from the main shaft.

2. The variable-diameter reamer for a horizontal directional drill according to claim 1, characterized in that, There is an active interval between the support rod and the first positioning block.

3. The variable-diameter reamer for a horizontal directional drill according to claim 1, characterized in that, The main shaft includes a first shaft section and a second shaft section, the first shaft section and the second shaft section are detachably connected, the first positioning block is sleeved on the first shaft section, the second positioning block is sleeved on the second shaft section, and an octagonal sleeve is sleeved between the first shaft section and the second shaft section.

4. The variable-diameter reamer for horizontal directional drilling rig according to claim 3, characterized in that, The first shaft section is provided with a mounting hole, the octagonal sleeve is provided with a positioning hole, and a connecting piece sequentially passes through the positioning hole and the mounting hole to connect the octagonal sleeve and the first shaft section.

5. The variable diameter reamer for a horizontal directional drill according to claim 3, characterized in that The outer surface of the octagonal sleeve is provided with anti-slip lines.

6. The variable-diameter reamer for a horizontal directional drill according to claim 1, characterized in that One end of the support rod is hinged to the first positioning block, and the other end is hinged to the second positioning block.

7. The variable-diameter reamer for a horizontal directional drill according to claim 6, characterized in that, The support rod extends obliquely along the circumferential direction of the main shaft.

8. The variable-diameter reamer for a horizontal directional drill according to any one of claims 1 to 7, characterized in that, The first positioning block is provided with a water storage space and a water spraying hole communicating with the water storage space, and the water spraying hole is located on the side of the first positioning block facing the second positioning block.

9. The variable-diameter reamer for a horizontal directional drill according to claim 8, wherein, The first positioning block is provided with a plurality of the water spraying holes, and the plurality of water spraying holes are arranged at intervals around the main shaft.

10. A horizontal directional drill, comprising: Equipment main body; Drill pipe, one end of which is connected to the equipment main body; The variable-diameter reamer for horizontal directional drill according to any one of claims 1 to 9, wherein the main shaft is connected to the drill pipe.

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