Self-cleaning cone reamer

Abstract

The utility model discloses a self-cleaning cone reamer which is characterized in that cone palm sheet groups are uniformly distributed along the circumferential direction along the central line of a core shaft and are positioned above a bottom plate, a baffle plate and a cover plate are respectively welded on the side surface and the upper part of the cone palm sheet groups, and a centralizing block and an annular rib are positioned in front of the cone palm sheet groups and are used for centralizing and supporting; the slag removal block is radially positioned below the cone of the cone palm piece group and axially positioned in front of the cover plate and on the rear side of the centralizing block; the mandrel is of a hollow structure and is provided with a central inner hole and a radial water hole communicated with the central inner hole, a lower water hole is formed in the lower portion of each slag removal block, side water holes are symmetrically formed in the two side faces of each slag removal block, the lower water holes are communicated with the radial water holes, the side water holes are communicated with the lower water holes, and the spraying direction of the side water holes of each slag removal block faces the meshing positions of the adjacent cones on the two sides and the slag removal blocks; slurry can enter through the central inner hole of the core shaft, is sprayed out from the side water holes through the radial water holes and the lower water holes, and faces the meshing positions of the cones on the two adjacent sides and the slag removing blocks to clean rock slag wrapping the cones. The self-cleaning function is achieved, and the alloy teeth make full contact with the rock.

Description

Technical Field

[0001] The utility model relates to a self-cleaning cone reamer and belongs to the technical field of rock drilling tools. Background Art

[0002] The roller reamer is the most common drilling tool used in trenchless horizontal directional drilling (HDD). Composed of a mandrel, a cone palm, and other steel components, the roller reamer represents an extension of the tricone drill bit's application in HDD. The palm is the rock-breaking component of the roller reamer. The palm structure is derived from that of a traditional tricone drill bit, which features three cones: primary, secondary, and tertiary. These three cones, when combined, form a complete cutting ring along the drill bit's or reamer's centerline, effectively breaking the rock.

[0003] The three meshing cones of a traditional three-cone drill bit, with each row of alloy teeth on each cone rotating in adjacent grooves without interfering with each other, allow the alloy teeth to remove rock debris from adjacent grooves as the cones rotate to break rock, achieving a self-cleaning effect and preventing mud packing. Therefore, the drill bit is also called a self-cleaning drill bit. However, when the cone palm is installed as a reamer, the meshing relationship between the adjacent cones is lost. During operation, the crushed rock debris is easily coated on the cones by the mud, causing mud packing. In severe cases, the entire cone is encapsulated, preventing the alloy teeth from effectively contacting the rock, which affects the reamer's rock breaking ability.

[0004] Therefore, it is necessary to design a roller reamer with a slag cleaning effect to solve the mud balling phenomenon during the working process of the roller reamer and improve the rock breaking effect of the reamer. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a self-cleaning cone reamer, which aims to effectively clean the mud bags produced by rock chips covering the surface of the cone during the operation of the reamer, avoid the problem that the alloy teeth cannot directly contact the rock to break the rock, and improve the rock breaking effect of the reamer.

[0006] The purpose of this utility model is achieved through the following technical solutions:

[0007] The self-cleaning cone reamer is characterized by comprising a mandrel and a cone palm assembly, wherein the cone palm assembly is evenly distributed along the circumference of the mandrel centerline and is located above the base plate; a baffle and a cover plate are welded to the side and top of the cone palm assembly, respectively; a centering block and annular rib are located in front of the cone palm assembly for centering support; a slag cleaning block is radially located below the cone of the cone palm assembly and axially located in front of the cover plate and behind the centering block;

[0008] The core shaft is a hollow structure with a central inner hole and radial water holes connected to it. There is a downhole hole under the slag cleaning block and side water holes symmetrically on both sides. The downhole hole is connected to the radial water holes, and the side water holes are connected to the downhole holes. The spray direction of the side water hole of each slag cleaning block is toward the meshing position of the adjacent gears and the slag cleaning blocks on both sides; the mud can enter through the central inner hole of the core shaft, and be sprayed out from the side water holes through the radial water holes and the downhole holes, toward the meshing position of the adjacent gears and the slag cleaning blocks on both sides to clean the rock debris wrapped on the gears.

[0009] Furthermore, in the above-mentioned self-cleaning gear reamer, the core shaft is processed with a drainage hole connected to the central inner hole, the drainage hole is connected to the flow channel chamber composed of the base plate, the gear palm group, the cover plate and the baffle, and the mud passes through the central inner hole of the core shaft and the drainage hole and is sprayed out from the nozzle of the gear palm to discharge slag.

[0010] Furthermore, in the above-mentioned self-cleaning roller reamer, the rear reinforcing rib is placed behind the base plate for support.

[0011] Furthermore, in the above-mentioned self-cleaning cone reamer, the cone palm group includes three cone palms, below cone palm one is slag cleaning block one, below cone palm two is slag cleaning block two, and below cone palm three is slag cleaning block three. The upper surface contour of each slag cleaning block corresponds to the cone palm, and the contour of each cone palm is engaged with the contour of the slag cleaning block below it, and a gap is maintained.

[0012] Furthermore, in the above-mentioned self-cleaning roller reamer, the gap is 3 to 6 mm.

[0013] Compared with the prior art, the present invention has significant advantages and beneficial effects, which are specifically reflected in the following aspects:

[0014] The utility model effectively avoids the formation of mud packing on the cone during the operation of the reamer, has a self-cleaning function, and ensures that the alloy teeth can fully contact the rock, ensuring a comprehensive rock breaking effect. By effectively cleaning the mud packing caused by rock debris covering the surface of the cone during the operation of the reamer, the problem of the alloy teeth being unable to directly contact the rock for rock breaking is eliminated, thereby improving the rock breaking effect of the reamer.

[0015] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the specific embodiments of the present invention. The purposes and other advantages of the present invention can be achieved and obtained by the structures particularly pointed out in the written description and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 : A schematic structural diagram of the utility model roller reamer;

[0018] Figure 2 : A schematic structural diagram of the cone reamer of the present invention without a cone palm set;

[0019] Figure 3 : Schematic diagram of the matching relationship between each cone palm and the slag cleaning block;

[0020] Figure 4 : Schematic diagram of slag block ejection. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the utility model for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0022] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. At the same time, in the description of this utility model, directional terms and order terms are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0023] like Figures 1 to 4 As shown, the self-cleaning cone reamer includes a core shaft 2 and a cone palm piece group 1. The cone palm piece group 1 is evenly distributed along the circumference of the center line of the core shaft 2 and is located above the base plate 4. The cone palm piece group 1 includes a cone palm and a cone located thereon. The cone palm is the base body at the bottom and the cone is the rotating body with teeth on the top.

[0024] The baffle 5 and cover plate 6 are welded to the side and top of the cone palm group respectively. The rear reinforcement rib 3 is placed behind the base plate 4 for support. The straightening block 7 and annular rib 8 are located in front of the cone palm group 1 for straightening and support. The slag cleaning block 9 is radially located below the cone of the cone palm group 1 and axially located in front of the cover plate 6 and behind the straightening block 7.

[0025] The core shaft 2 is a hollow structure with a central inner hole 201 and radial water holes 202 connected thereto. There is a drain hole 301 under the slag cleaning block and side water holes 302 symmetrically on both sides. The drain hole 301 is connected to the radial water holes 202, and the side water holes 302 are connected to the drain hole 301. The spray direction of each side water hole 302 of the slag cleaning block is toward the meshing position of the adjacent gears and the slag cleaning blocks on both sides; during operation, mud can enter through the central inner hole 201 of the core shaft and be sprayed out from the side water holes 302 through the radial water holes 202 and the drain hole 301. The mud spray direction C is toward the meshing position of the adjacent gears and the slag cleaning blocks on both sides to clean the rock debris wrapped on the gears.

[0026] The core shaft 2 is also processed with a drainage hole connected to the central inner hole 201, and the drainage hole leads to the flow channel bin. The flow channel bin is a space composed of the bottom plate 4, the gear palm group, the cover plate 6 and the baffle 5. During operation, the mud passes through the central inner hole of the core shaft and the drainage hole and is sprayed out from the nozzle of the gear palm to discharge slag.

[0027] The scraping of rock debris by the upper contour of the slag cleaning block and the cleaning by spraying mud through the side water holes ensure the cleanliness of the surface of the cone, and the alloy teeth can be in full contact with the rock without any mud bag, thereby improving the comprehensive damage effect of the cone on the rock.

[0028] The number of cone palms is determined by the specifications of the reamer and the formation conditions. The number should be no less than 3. A group of 3 cone palms forms a complete set of crushing rings. Specifically, Figure 3 The cone palm assembly 1 includes three cones. Below cone palm 1 101 is a slag cleaning block 1 901, below cone palm 2 102 is a slag cleaning block 2 902, and below cone palm 3 103 is a slag cleaning block 3 903. The top surface contour of each slag cleaning block corresponds to that of the cone. The contours of each cone mesh with the contours of the slag cleaning block below it without interfering with each other, maintaining a 3-6mm gap. As the reamer's working cone rotates, the slag cleaning blocks scrape away rock debris and mud bags wrapped around the cone.

[0029] In summary, the present invention effectively prevents the formation of mud packing on the cones during reaming operation, has a self-cleaning function, and ensures that the alloy teeth can fully contact the rock, ensuring a comprehensive rock breaking effect. By effectively cleaning the mud packing caused by rock debris coating the surface of the cones during reaming operation, the problem of the alloy teeth being unable to directly contact the rock for breaking is eliminated, thereby improving the rock breaking effect of the reamer.

[0030] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, improvements, and the like made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention. It should be noted that similar reference numerals and letters denote similar items in the following figures. Therefore, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.

[0031] The above is only a specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with this technical field can easily think of changes or replacements within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0032] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

Claims

1. Self-cleaning roller reamer, characterized by: The invention comprises a core shaft (2) and a cone palm piece group (1), wherein the cone palm piece group (1) is evenly distributed along the circumferential direction with the center line of the core shaft (2) and is located above the bottom plate (4); a baffle (5) and a cover plate (6) are respectively welded to the side and top of the cone palm piece group; a straightening block (7) and an annular rib (8) are located in front of the cone palm piece group (1) for straightening support; a slag cleaning block (9) is radially located below the cone of the cone palm piece group (1) and axially located in front of the cover plate (6) and behind the straightening block (7); The core shaft (2) is a hollow structure, and is processed with a central inner hole (201) and radial water holes (202) connected thereto. A lower water hole (301) is provided below the slag cleaning block, and side water holes (302) are symmetrically provided on both sides. The lower water hole (301) is communicated with the radial water holes (202), and the side water holes (302) are communicated with the lower water hole (301). The spray direction of each slag cleaning block side water hole (302) is toward the meshing position of the adjacent gears and the slag cleaning block on both sides; mud can enter through the central inner hole (201) of the core shaft, and be sprayed out from the side water holes (302) through the radial water holes (202) and the lower water hole (301), toward the meshing position of the adjacent gears and the slag cleaning block on both sides, so as to clean the rock debris wrapped on the gears.

2. The self-cleaning roller reamer according to claim 1, characterized in that: The core shaft (2) is processed with a drainage hole connected to the central inner hole (201), and the drainage hole is connected to the flow channel chamber composed of the bottom plate (4), the gear palm plate group (1), the cover plate (6) and the baffle (5).

3. The self-cleaning roller reamer according to claim 1, characterized in that: The rear reinforcing rib (3) is placed behind the bottom plate (4) for support.

4. The self-cleaning roller reamer according to claim 1, characterized in that: The gear palm piece group (1) comprises three gear palm pieces, wherein the lower portion of the gear palm piece 1 (101) is a slag cleaning block 1 (901), the lower portion of the gear palm piece 2 (102) is a slag cleaning block 2 (902), and the lower portion of the gear palm piece 3 (103) is a slag cleaning block 3 (903). The upper surface contour of each slag cleaning block corresponds to the gear palm piece, and the contour of each gear palm piece and the contour of the slag cleaning block below it are meshed with each other and a gap is maintained.

5. The self-cleaning roller reamer according to claim 4, characterized in that: The gap is 3 to 6 mm.

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