A mortise and tenon connection type active drill rod

Abstract

The present invention relates to a mortise and tenon connection type active drill rod, belonging to the technical field of coal mine drilling rigs. It includes a main shaft connection member and a drill rod connection member, the main shaft connection member includes a first rod body, the first rod body is provided with a main shaft connection mechanism connected to the main shaft, and the end surface of the first rod body away from the main shaft connection mechanism is provided with a first connection part; the drill rod connection member includes a second rod body, the end surface of the second rod body is provided with a second connection part mortise-matched with the first connection part, and the other end of the second rod body is provided with a threaded joint connected to the drill rod, and the main shaft connection member and the drill rod connection member are mortise-joined through the first connection part and the second connection part. It solves the technical problems of the existing active drill rod replacement steps being complicated, the replacement efficiency being low, and the maintenance cost being high.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mine drilling machines, and in particular relates to a mortise and tenon connection type active drill rod. Background Art

[0002] The active drill rod is the intermediate component that connects the main shaft of the power head and the drill rod. It transmits the torque and push-pull force of the power head to the drill rod during the drilling process. Due to the high frequency of use, the threaded joint connecting the active drill rod to the drill rod is prone to wear and breakage. It is a wearing part and needs to be replaced frequently. Existing active drill rods all adopt an integral structure, that is, the threaded joint end of the active drill rod to the main shaft connection end is an integral whole. When the threaded joint is damaged, the entire active drill rod must be replaced, resulting in complicated replacement steps, low replacement efficiency and high maintenance costs.

[0003] In some prior art, for example, Chinese patent application number 201410618071.8 discloses an underground gas extraction drilling rig, in which the main shaft of the power head transmits torque to the active joint (active drill rod) through a key or other connection method, and an end cover connected to the end face screw of the main shaft is used to limit the axial position of the active joint. The active drill rod of the patent is an integral part, and a large number of bolts need to be removed when replacing, which is time-consuming and labor-intensive.

[0004] Chinese patent application number 201010234399.1 discloses a remote-controlled underground gas extraction drilling rig; its active drill rod is an integral part, and when replacing it, it is necessary to remove multiple fastening screws and unscrew the threaded connection between the active drill rod and the main shaft, which is also very inconvenient.

[0005] The Chinese patent application number 202022404562.6 discloses a drilling rig power head with a floating drill pipe joint; it mainly improves the connection method between the active drill pipe and the main shaft, making it have a floating function, thereby extending the life of the threaded joint. However, the active drill pipe is still an integral part, and the workload of replacement and disassembly is still large. Summary of the invention

[0006] In view of this, the purpose of the present invention is to provide a mortise and tenon connected active drill rod to solve the technical problems of complex replacement steps, low replacement efficiency and high maintenance cost of the existing active drill rod.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A mortise and tenon connection type active drill rod, comprising a main shaft connection piece and a drill rod connection piece, wherein the main shaft connection piece comprises a first rod body, the first rod body is provided with a main shaft connection mechanism for connecting to the main shaft, and the end surface of the first rod body away from the main shaft connection mechanism is provided with a first connecting portion; the drill rod connection piece comprises a second rod body, the end surface of the second rod body is provided with a second connecting portion mortise-jointed with the first connecting portion, the other end of the second rod body is provided with a threaded joint for connecting to the drill rod, and the main shaft connection piece and the drill rod connection piece are mortise-jointed by the first connecting portion and the second connecting portion.

[0009] Further, the first connecting portion includes at least two first hooks fixedly mounted on the end surface of the first rod body, the first hooks are evenly distributed along the circumference of the end surface of the first rod body and arranged in the same direction; the first hooks are L-shaped, and the first hooks are fixedly connected to the end surface of the first rod body to form an L-shaped open hollow groove;

[0010] The second connecting portion includes a second hook fixedly mounted on the end surface of the second rod body and corresponding to the first hook one by one, the second hook is L-shaped, and the second hook is arranged opposite to the first hook; the second hook is screwed into the hollow mortise of the first rod body and is mortised with the first hook;

[0011] A wedge for limiting position is inserted into the slot formed by the mortise and tenon connection of the first hook head and the second hook head.

[0012] Furthermore, the wedge comprises a wedge body, which is a strip block with a fan-shaped cross section. A pulling hole is provided on the wedge body, the axis of the pulling hole is perpendicular to the axis of the first rod body, and a thread is provided in the pulling hole.

[0013] Furthermore, a countersunk hole is provided on the wedge body, and the axis of the countersunk hole is perpendicular to the axis of the pulling hole; a plug is detachably connected to the countersunk hole to close the countersunk hole, and the plug is provided with a through hole; a spring is provided in the countersunk hole, and a bayonet is inserted on the spring, and the middle radius of the bayonet is larger than the radius of both ends, and the end of the bayonet away from the spring is a hemispherical ball head, and the ball head passes through the through hole on the plug and extends out of the wedge body.

[0014] Furthermore, the plug is connected to the countersunk hole via threads.

[0015] Furthermore, a positioning groove matching with the ball head is axially provided on the end surfaces of the connecting ends of the first rod body and the second rod body.

[0016] The beneficial effects of the present invention are:

[0017] 1. The present invention has a simple structure, and the transmission of push-pull force and positive and negative torque is achieved through a simple combination of a mortise and tenon structure formed by a plurality of hooks and a wedge.

[0018] 2. The present invention divides the existing active drill rod into two parts. When one end with the threaded joint is damaged, only the drill rod connector with the threaded joint needs to be replaced, thereby reducing maintenance costs.

[0019] 3. The installation and disassembly method of the present invention is simple. It is only necessary to pull out the wedge first and then rotate the drill pipe connector. It is no longer necessary to disassemble the part connected to the main shaft, which improves the on-site maintenance efficiency and the comprehensive construction efficiency.

[0020] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0022] Figure 1 A schematic diagram of a mortise and tenon joint active drill rod;

[0023] Figure 2 This is a schematic diagram of the main shaft connection;

[0024] Figure 3 It is a schematic diagram of the drill pipe connection;

[0025] Figure 4 is the front view of the wedge;

[0026] Figure 5 for Figure 4 Schematic diagram of half section of AA section;

[0027] Figure 6 A schematic diagram of the installation of a mortise and tenon type active drill rod Figure 1 ;

[0028] Figure 7 A schematic diagram of the installation of a mortise and tenon type active drill rod Figure 2 ;

[0029] Figure 8 A schematic diagram of the installation of a mortise and tenon type active drill rod Figure 3 .

[0030] Figure numerals: spindle connecting piece 1, wedge 2, drill rod connecting piece 3, spindle connecting mechanism 101, first rod body 102, first hook head 103, positioning groove 104, threaded joint 301, second rod body 302, second hook head 303, positioning groove 304, wedge body 201, extraction hole 202, spring 203, bayonet 204, plug 205. DETAILED DESCRIPTION

[0031] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0032] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0033] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing 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 operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0034] A mortise and tenon connection type active drill rod, the main principle of which is to divide a traditional integral active drill rod into two parts, wherein a main shaft connecting piece 1 is connected to the main shaft, and a drill rod connecting piece 3 is connected to the drill rod, and the two parts are connected by a detachable mortise and tenon structure; when the threaded joint 301 of the drill rod connecting piece 3 connected to the drill rod is damaged, only the drill rod connecting piece 3 needs to be replaced, and there is no need to disassemble the entire drill rod and the main shaft for replacement, so that the replacement efficiency is improved and the cost can be greatly saved.

[0035] See also Figure 1-8The mortise and tenon connection type active drill pipe comprises a main shaft connection part 1, a drill pipe connection part 3 and a wedge 2.

[0036] like Figure 2 As shown, the spindle connecting member 1 includes a spindle connecting mechanism 101, a first rod body 102, a first hook 103, and a positioning groove 104. The spindle connecting mechanism 101 is sleeved on the first rod body 102 for connecting with the spindle. Three first hooks 103 are fixedly provided on the end face of the first rod body 102 away from the spindle connecting mechanism 101. The three first hooks 103 are evenly distributed along the end face of the first rod body 102. The first hooks 103 are L-shaped. The L-shaped first hooks 103 are fixedly connected to the end face of the first rod body 102 and form an L-shaped open hollow groove; the free ends of the three first hooks 103 point to the same circumferential direction in a clockwise or counterclockwise direction. A positioning groove 104 is also provided on the end face of the first rod body 102 along the axial direction for positioning the wedge 2; the projection of the positioning groove 104 and the first hook 103 on the end face of the first rod body 102 do not overlap.

[0037] like Figure 3 As shown, the drill rod connector 3 includes a threaded joint 301, a second rod body 302, a second hook 303, and a positioning groove 304; a threaded joint 301 is fixed at one end of the second rod body 302 for connecting with the drill rod. Three second hooks 303 corresponding to the first hooks 103 are arranged on the end face of the second rod body 302 away from the threaded joint 301, and the second hooks 303 are also L-shaped, and the free ends of the second hooks 303 point in opposite directions to the free ends of the first hooks 103, so that the second hooks 303 can be rotatably engaged with the first hooks 103; a positioning groove 304 corresponding to the positioning groove 104 is arranged on the end face of the second rod body 302 along the axial direction, which is used for positioning the wedge 2, and the projections of the positioning groove 304 and the second hooks 303 on the end face of the second rod body 302 do not overlap.

[0038] like Figure 4-5 As shown, the wedge 2 includes a wedge body 201, which is a strip block with a fan-shaped cross section. The size of the strip block matches the slot formed by the first hook head 103 and the second hook head 303. The wedge body 201 is provided with a pull-out hole 202, and the extended axis of the pull-out hole 202 passes through the two curved surfaces of the wedge body 201. When the wedge 2 is inserted into the slot formed by the first hook head 103 and the second hook head 303, the axis of the pull-out hole 202 is perpendicular to the axis of the entire active drill pipe. The pull-out hole 202 is provided with an internal thread, which can cooperate with the external thread on the puller to make the wedge 2 easier to pull out.

[0039] A corresponding countersunk hole is opened on a relative plane of the wedge 201, and the axes of the two countersunk holes are perpendicular to the axis of the extraction hole 202. The countersunk hole is provided with an internal thread, and a plug 205 for closing the countersunk hole is connected to the open end of the countersunk hole through a thread, and a through hole is provided in the center of the plug 205. A spring 203 is provided at the bottom of the countersunk hole, and a bayonet 204 is inserted on the spring 203. The bayonet 204 is divided into three sections. The section of the bayonet 204 away from the spring 203 is a hemispherical ball head, which passes through the plug 205 at the end of the countersunk hole and extends out of the wedge 201. The ball head can be embedded in the positioning grooves on the end faces of the first rod body 102 and the second rod body 302 to achieve radial limiting of the wedge 2; the middle of the bayonet 204 is a large cylindrical section, located between the spring 203 and the plug 205, which can axially squeeze the spring 203; the rear end is a small cylindrical section, which is inserted into the spring 203 to guide the installation of the spring 203.

[0040] Optionally, the number of the first hook 103 and the second hook 303 can be selected according to the actual situation, as long as it can meet the mutual mortise and tenon connection of the first hook 103 and the second hook 303, as well as the transmission of torque and tension. The specific mortise and tenon structure of the first connecting part and the second connecting part can also be designed into various detachable connection structures such as dovetail tenon and tie tenon according to the specific situation. The L-shaped hook in this embodiment can also be preferably a T-shaped hook and other shapes that can be mortised with each other.

[0041] Specific installation and removal steps:

[0042] like Figure 6-8 As shown, the free ends of the first hook 103 and the second hook 303 are used as tenons, and the L-shaped open hollow formed by the first hook 103 and the second hook 303 and their respective end faces is used as a tenon groove, and the tenon of the second rod body 302 is screwed into the tenon groove of the first rod body 102, so that the first hook 103 and the second hook 303 are mortised with each other; after the two hooks are mortised together, a slot is formed, and the wedge 2 is inserted into the slot formed by the mortise and tenon joint of the first hook 103 and the second hook 303, and the ball head of the wedge 2 is inserted into the positioning groove on the connecting end faces of the first rod body 102 and the second rod body 302, so that the wedge 2 is positioned and fixed. The limited fixed connection of the main shaft connector 1 and the drill rod connector 3 is completed.

[0043] When the threaded joint 301 of the drill pipe connector 3 is damaged and needs to be replaced, it is only necessary to screw the threaded puller into the pull-out hole 202 of the wedge 2, pull out the wedge 2, and then rotate the second rod body 302 to replace the drill pipe connector 3, thereby improving on-site maintenance efficiency and reducing maintenance costs.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A mortise and tenon connection type active drill pipe, characterized in that: It includes a main shaft connecting piece and a drill pipe connecting piece. The main shaft connecting piece includes a first rod body. A main shaft connecting mechanism for connecting with the main shaft is provided on the first rod body. A first connecting part is provided on the end face of the first rod body far away from the main shaft connecting mechanism. The drill pipe connecting piece includes a second rod body. A second connecting part that is mortise-connected with the first connecting part is provided on the end face of the second rod body. A threaded joint for connecting with the drill pipe is provided at the other end of the second rod body. The main shaft connecting piece and the drill pipe connecting piece are mortise and tenon connected through the first connecting part and the second connecting part; The first connecting part includes at least two first hooks fixed on the end face of the first rod body. The first hooks are evenly distributed along the circumference of the end face of the first rod body and are arranged in the same direction. The first hook is L-shaped, and the first hook is fixedly connected with the end face of the first rod body to form an L-shaped open hollow mortise; The second connecting part includes second hooks fixed on the end face of the second rod body and corresponding to the first hooks one by one. The second hook is L-shaped, and the second hook is arranged in the opposite direction to the first hook. The second hook is screwed into the hollow mortise of the first rod body and is mortise-connected with the first hook; A wedge for limiting is also inserted into the card slot formed after the first hook and the second hook are mortise-connected; The wedge includes a wedge body. The wedge body is a strip-shaped block with a fan-shaped cross section. A pulling hole is provided on the wedge body. The axis of the pulling hole is perpendicular to the axis of the first rod body, and a thread is provided in the pulling hole.

2. A mortise and tenon connection type active drill pipe according to claim 1, characterized in that: A counterbore is opened on the wedge body. The axis of the counterbore is perpendicular to the axis of the pulling hole. A plug for closing the counterbore is detachably connected to the counterbore. A through hole is provided on the plug. A spring is provided in the counterbore. A pin is inserted on the spring. The middle radius of the pin is larger than the radii of both ends. One end of the pin away from the spring is a hemispherical ball head, and the ball head passes through the through hole on the plug and extends out of the wedge body.

3. A mortise and tenon connection type active drill pipe according to claim 2, characterized in that: The plug is threadedly connected with the counterbore.

4. A mortise and tenon connection type active drill pipe according to claim 2, characterized in that: A positioning groove for cooperating with the ball head is axially provided on the end face of the connecting end of the first rod body and the second rod body.

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