Chuck mechanism for a roller bit

Abstract

The utility model relates to the technical field of well drilling engineering provides a chuck mechanism for roller bit drilling rig, include: chuck main part, clamping block and limiting piece, chuck main part includes clamping assembly and guide frame, clamping assembly is worn in the center hole of the working platform of drill stand, clamping assembly has the through -hole for accommodating down drill rod, clamping assembly is connected with guide frame, clamping assembly can drive guide frame rotates around the central axis of center hole, and the sliding clearance is formed in guide frame, clamping block is movably arranged in the sliding clearance along the radial direction of center hole, and clamping block forms the clamping mouth for clamping down drill rod, limiting piece is arranged on the working platform of drill stand, and is spaced apart with chuck main part, and limiting piece is used for limiting guide frame to swing in particular swing angle. The utility model discloses the chuck mechanism for roller bit drilling rig, makes down drill rod can be loosened relative to upper drill rod, thereby assisting down drill rod and the unloading operation of upper drill rod, improves the effectiveness of down drill rod unloading.

Description

Technical Field

[0001] This utility model relates to the field of drilling engineering technology, and in particular to a chuck mechanism for a roller cone drilling rig. Background Technology

[0002] During drilling operations, rotary drills require frequent connection and disconnection of drill rods. New drill rods are connected to increase the drilling depth, or used drill rods are disassembled to complete the drilling or replace the drill bit.

[0003] When connecting and disconnecting drill rods, the lower drill rod is secured by an auxiliary fixing device, and the upper drill rod is rotated by the power head of the roller cone drill to loosen or tighten the threads between the upper and lower drill rods. When the threaded connection between the upper and lower drill rods is relatively secure, it is difficult to loosen the upper drill rod from the lower drill rod when the power head rotates the upper drill rod. Utility Model Content

[0004] This utility model provides a chuck mechanism for a roller cone drill to solve the problem in the prior art where, when the connection between the upper and lower drill rods is relatively firm, the power head is unable to loosen the upper drill rod relative to the lower drill rod.

[0005] This utility model provides a chuck mechanism for a roller cone drill, comprising:

[0006] The chuck body includes a clamping assembly and a guide frame. The clamping assembly passes through the center hole of the work platform of the drill frame. The clamping assembly has a through hole for accommodating the lower drill rod. The clamping assembly is connected to the guide frame. The clamping assembly can drive the guide frame to rotate around the central axis of the center hole. A sliding gap is formed in the guide frame.

[0007] A clamping block is movably disposed within the sliding gap along the radial direction of the central hole, and the clamping block is formed with a clamping opening for clamping the lower drill rod;

[0008] A limiting component is provided on the working platform of the drill frame and spaced apart from the chuck body. The limiting component is used to limit the swing of the guide frame within a specific swing angle.

[0009] According to the present invention, a chuck mechanism for a roller cone drill provides that the clamping assembly includes:

[0010] A base plate is provided on the upper side of the working platform of the drill frame. The base plate has mounting holes, and the guide frame is connected to the upper side of the base plate.

[0011] The positioning cylinder has its upper end inserted into the mounting hole and its lower end located on the lower side of the working platform of the drill frame. The inner wall of the positioning cylinder forms the through hole.

[0012] The chuck mechanism for a roller cone drill according to this utility model further includes: a clamp;

[0013] The positioning cylinder has a positioning groove along its circumference at one end away from the base plate, and the clamp is installed in the positioning groove;

[0014] The base plate and the clamp respectively constrain the axial displacement of the positioning cylinder from both ends of the positioning cylinder.

[0015] The chuck mechanism for a roller cone drill according to the present invention further includes: a positioning sleeve;

[0016] The positioning sleeve includes a positioning flange and a cylindrical body;

[0017] The positioning flange is connected to the cylinder body, the positioning flange is pressed onto the top surface of the positioning cylinder, and the cylinder body is inserted into the through hole;

[0018] The positioning sleeve comes in various sizes, and the inner diameter of the positioning sleeve varies with the size of the sleeve.

[0019] According to the present invention, a chuck mechanism for a roller cone drill provides a guide frame comprising:

[0020] A first guide plate is disposed on the upper side of the base plate;

[0021] The second guide plate is spaced apart from the first guide plate, and the sliding gap is formed between the first guide plate and the second guide plate.

[0022] The side plate is connected to the first guide plate and the second guide plate.

[0023] According to the present invention, a chuck mechanism for a roller cone drill is provided, wherein the limiting member includes a first limiting block and a second limiting block;

[0024] The first limiting block and the second limiting block are both located on the working platform of the drill frame and are located on both sides of the guide frame.

[0025] According to the present invention, a chuck mechanism for a roller cone drill provides that the chuck block includes:

[0026] ontology;

[0027] The clamping part has two clamping parts, which are respectively connected to the body. The clamping opening is formed between the two clamping parts, and the opposite sides of the clamping parts form parallel clamping surfaces to adapt to the flat opening of the lower drill rod.

[0028] According to the present invention, a chuck mechanism for a roller cone drill is provided, wherein the chuck block is provided in various specifications, and the diameter of the clamping opening of the chuck block of different specifications is different.

[0029] According to the present invention, a chuck mechanism for a roller cone drill rig is provided, wherein the chuck body further includes a hydraulic cylinder;

[0030] The hydraulic cylinder is installed on the inner wall of the guide frame, and the output end of the hydraulic cylinder is connected to the locking block.

[0031] According to the present invention, a chuck mechanism for a rotary drill rig is provided, wherein the chuck body further includes: a dust cover;

[0032] The dust cover is installed on the top of the guide frame.

[0033] The chuck mechanism for roller cone drills provided by this utility model consists of a chuck body, a chuck block, and a limiting component. The chuck body includes a clamping assembly and a guide frame. The clamping port of the chuck block is used to clamp the lower drill rod. The clamping assembly can drive the guide frame to rotate around the central axis of the central hole, so as to swing at a specific swing angle limited by the limiting component. The lower drill rod is then subjected to a collision force by colliding with the limiting component, which allows the lower drill rod to loosen relative to the upper drill rod, thereby assisting in the connection and disconnection operation of the lower drill rod and improving the effectiveness of the connection and disconnection of the lower drill rod. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0035] Figure 1 This is a three-dimensional structural diagram of the chuck mechanism for a roller cone drill provided by this utility model.

[0036] Figure 2 This is a three-dimensional structural diagram of the chuck mechanism provided by this utility model installed on the drill frame.

[0037] Figure 3 This is a top view of the chuck mechanism for a roller cone drill provided by this utility model.

[0038] Figure 4 This utility model provides Figure 3 AA sectional view.

[0039] Figure 5 This is a three-dimensional structural diagram of the chuck body provided by this utility model.

[0040] Figure 6 This is a three-dimensional structural diagram of the card block provided by this utility model.

[0041] Figure 7 This is a three-dimensional structural diagram of the clamp provided by this utility model.

[0042] Figure 8 This is a three-dimensional structural diagram of the positioning sleeve provided by this utility model.

[0043] Figure label:

[0044] 1. Chuck mechanism for roller cone drilling rigs;

[0045] 11. Chuck body; 12. Chuck block; 13. Limiting component; 14. Clamp; 15. Positioning sleeve; 16. Hydraulic cylinder; 111. Clamping assembly; 112. Guide frame; 113. Dust cover; 121. Body; 122. Clamping part; 131. First limiting block; 132. Second limiting block; 151. Positioning flange; 152. Cylinder; 1111. Base plate; 1112. Positioning cylinder; 1121. First guide plate; 1122. Second guide plate; 1123. Side plate; 11121. Positioning groove;

[0046] 2. Drill frame; 3. Upper drill pipe; 4. Lower drill pipe. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0048] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of clarifying the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0049] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model according to the specific circumstances.

[0050] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0051] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0052] The following is combined with Figures 1 to 8 The chuck mechanism for roller cone drills provided in this utility model will be described in detail through specific embodiments and application scenarios.

[0053] like Figure 1 and Figure 2 As shown, this embodiment provides a chuck mechanism 1 for a roller cone drill, including: a chuck body 11, a chuck block 12, and a limiting member 13.

[0054] The chuck body 11 includes a clamping assembly 111 and a guide frame 112. The clamping assembly 111 passes through the center hole of the working platform of the drill frame 2. The clamping assembly 111 has a through hole for accommodating the lower drill rod 4. The clamping assembly 111 is connected to the guide frame 112. The clamping assembly 111 can drive the guide frame 112 to rotate around the central axis of the center hole, and a sliding gap is formed in the guide frame 112.

[0055] The clamping block 12 is movably disposed within the sliding gap along the radial direction of the central hole, and the clamping block 12 is formed with a clamping opening for clamping the lower drill rod 4.

[0056] The limiting member 13 is located on the working platform of the drill frame 2 and is spaced apart from the chuck body 11. The limiting member 13 is used to limit the guide frame 112 to swing within a specific swing angle.

[0057] Understandably, during drilling operations, the drill frame 2 is first installed and anchored in the foundation. The working platform of the drill frame 2 has a central hole through which both the upper drill rod 3 and the lower drill rod 4 pass. Then, the lower drill rod 4 is fixed using the locking block 12. The power head of the roller cone drill drives the upper drill rod 3 to rotate, thereby loosening or tightening the upper drill rod 3 and the lower drill rod 4, and thus achieving the connection and disconnection of the upper drill rod 3 and the lower drill rod 4.

[0058] The through hole of the clamping assembly 111 is used for the lower drill rod 4 to pass through. The clamping assembly 111 can support the lower drill rod 4 and constrain the radial displacement of the lower drill rod 4. The clamping port of the chuck block 12 is used to clamp the lower drill rod 4 and limit the rotation of the lower drill rod 4. This restricts the circumferential movement of the lower drill rod 4 when the upper drill rod 3 and the lower drill rod 4 are connected or disconnected. The power head can drive the upper drill rod 3 to rotate relative to the lower drill rod 4, thereby loosening or tightening the upper drill rod 3 and the lower drill rod 4.

[0059] Since the locking block 12 can slide within the sliding gap, the movement of the locking block 12 enables the switching between the unloading and drilling phases of the lower drill rod 4. When the lower drill rod 4 is in the unloading phase, the locking block 12 moves towards the center hole of the working platform of the drill frame 2. The locking block 12 extends out of the guide frame 112 and reaches a position where the center of the clamping opening coincides with the center of the center hole. The locking block 12 forms a stable clamping force on the lower drill rod 4, clamping and fixing it. When the lower drill rod 4 is in the drilling phase, the locking block 12 moves away from the center hole of the working platform of the drill frame 2. The locking block 12 retracts into the guide frame 112, and the lower drill rod 4 is no longer clamped and its circumferential movement is limited. The lower drill rod 4 can move axially under the constraint of the center hole to perform drilling.

[0060] Meanwhile, since the clamping assembly 111 can drive the guide frame 112 to rotate around the central axis of the central hole, and the swing angle is within the angle range limited by the limiting member 13, when disassembling the lower drill rod 4, if the threaded connection between the upper drill rod 3 and the lower drill rod 4 is too strong and the threads cannot be loosened by rotating the power head alone, the clamping assembly 111 and the guide frame 112 can rotate simultaneously with the upper drill rod 3 and the lower drill rod 4, and are limited by the limiting member 13. Since the clamping assembly 111, the guide frame 112 and the lower drill rod 4 continue to rotate under inertia at this time, they will collide with the limiting member 13. The reaction force of the collision force is transmitted to the lower drill rod 4 through the guide frame 112. The lower drill rod 4 is subjected to the collision force, and the friction of the threaded connection between the upper drill rod 3 and the lower drill rod 4 decreases instantaneously. The lower drill rod 4 loosens relative to the upper drill rod 3, thus achieving the loosening of the lower drill rod 4 relative to the upper drill rod 3. Alternatively, during the connection operation of the lower drill rod 4, if the upper drill rod 3 and the lower drill rod 4 have been screwed into place, the collision between the clamping assembly 111, the guide frame 112, and the lower drill rod 4 and the limiting member 13 can make the threaded connection between the upper drill rod 3 and the lower drill rod 4 more secure, thus achieving the tightening of the lower drill rod 4 relative to the upper drill rod 3.

[0061] Specifically, the limiting member 13 can be a strip-shaped structure extending along the swing path of the guide frame 112, or it can be a plurality of stop structures set at the critical position of the guide frame 112.

[0062] The chuck mechanism 1 for a roller cone drill provided by this utility model includes a chuck body 11, a chuck block 12, and a limiting member 13. The chuck body 11 includes a clamping assembly 111 and a guide frame 112. The clamping port of the chuck block 12 is used to clamp the lower drill rod 4. The clamping assembly 111 can drive the guide frame 112 to rotate around the central axis of the central hole, so as to swing at a specific swing angle limited by the limiting member 13. The lower drill rod 4 is subjected to a collision force by colliding with the limiting member 13, so that the lower drill rod 4 can be loosened relative to the upper drill rod 3, thereby assisting the connection and disconnection operation of the lower drill rod 4 and the upper drill rod 3 and improving the effectiveness of the connection and disconnection of the lower drill rod 4.

[0063] like Figure 3 , Figure 4 and Figure 5 As shown, the clamping assembly 111 in this embodiment includes a base plate 1111 and a positioning cylinder 1112.

[0064] The base plate 1111 is located on the upper side of the working platform of the drill frame 2. The base plate 1111 has mounting holes, and the guide frame 112 is connected to the upper side of the base plate 1111.

[0065] The upper end of the positioning cylinder 1112 is inserted into the mounting hole, and the lower end of the positioning cylinder 1112 is located on the lower side of the working platform of the drill frame 2. The inner wall of the positioning cylinder 1112 forms a through hole.

[0066] Understandably, the base plate 1111 presses against the upper surface of the working platform of the drill frame 2, and the mounting holes of the base plate 1111 and the center hole of the working platform are both used for the insertion of the upper end of the positioning cylinder 1112.

[0067] The base plate 1111 is arc-shaped on one side near the positioning cylinder 1112, and the positioning cylinder 1112 is a cylindrical body 152. The end of the base plate 1111 near the guide frame 112 is strip-shaped, and the guide frame 112 is rectangular. The length direction of the guide frame 112 is consistent with the length direction of the strip-shaped base plate 1111.

[0068] The base plate 1111 can define the relative position of the working platform of the drill frame 2 and connect with the bottom surface of the guide frame 112, so that the connection area between the guide frame 112 and the base plate 1111 is large enough to drive the positioning cylinder 1112 and the guide frame 112 to rotate simultaneously when the lower drill rod 4 rotates.

[0069] In addition, the inner wall of the positioning cylinder 1112 in this embodiment has a through hole for accommodating the lower drill rod 4.

[0070] like Figure 1 and Figure 7 As shown, the chuck mechanism 1 for the rotary drill in this embodiment also includes a clamp 14.

[0071] The positioning cylinder 1112 has a positioning groove 11121 along the circumferential direction at one end away from the base plate 1111, and the clamp 14 is installed in the positioning groove 11121; the base plate 1111 and the clamp 14 respectively constrain the axial displacement of the positioning cylinder 1112 from both ends of the positioning cylinder 1112.

[0072] Understandably, the bottom of the positioning cylinder 1112 is provided with an annular positioning groove 11121, which is located beside the working platform of the drill frame 2. The clamp 14 is installed in the positioning groove 11121, and the side circumferential of the clamp 14 abuts against the lower side of the working platform. Since the base plate 1111 presses against the upper side of the working platform and the clamp 14 is installed on the lower side of the working platform, the axial displacement of the positioning cylinder 1112 along the central hole is limited from both ends by the base plate 1111 and the clamp 14, which avoids axial movement caused by the rotation of the positioning cylinder 1112 and ensures the reliability of the lower drill rod 4 during connection and disconnection.

[0073] like Figure 1 and Figure 8 As shown, the chuck mechanism 1 for the rotary drill in this embodiment further includes a positioning sleeve 15.

[0074] The positioning sleeve 15 includes a positioning flange 151 and a cylinder 152; the positioning flange 151 and the cylinder 152 are connected, the positioning flange 151 is pressed on the top surface of the positioning cylinder 1112, and the cylinder 152 is inserted into the through hole.

[0075] The positioning sleeve 15 comes in various specifications, and the inner diameter of the positioning sleeve 15 is different for different specifications.

[0076] Understandably, in order to accommodate different specifications of the lower drill rod 4 and to avoid the need for assembling and disassembling the positioning sleeve 1112, this embodiment provides a positioning sleeve 15 for accommodating the lower drill rod 4. Positioning sleeves 15 of different specifications have the same outer diameter for installation against the inner wall of the positioning sleeve 15. The inner diameters of the positioning sleeves 15 have different specifications, each matching the outer diameter of a different lower drill rod 4. During installation, the positioning flange 151 is connected to the positioning sleeve 15 using a fastener, and the cylinder 152 is inserted into the inner wall of the positioning sleeve 15.

[0077] Meanwhile, when the lower drill rod 4 is being connected and disconnected, the outer wall of the lower drill rod 4 will generate friction with the inner wall of the positioning sleeve 15, causing wear to the positioning sleeve 15. In this embodiment, the positioning sleeve 15 is detachable and replaceable, which avoids wear on the fixing structure of the positioning cylinder 1112 and allows for convenient replacement.

[0078] like Figure 5 As shown, the guide frame 112 in this embodiment includes: a first guide plate 1121, a second guide plate 1122, and a side plate 1123.

[0079] The first guide plate 1121 is disposed on the upper side of the base plate 1111; the second guide plate 1122 is disposed at a distance from the first guide plate 1121, and a sliding gap is formed between the first guide plate 1121 and the second guide plate 1122.

[0080] The side plate 1123 is connected to the first guide plate 1121 and the second guide plate 1122.

[0081] Understandably, the first guide plate 1121 is fixedly connected to the base plate 1111, and the sliding gap formed between the first guide plate 1121 and the second guide plate 1122 is used to constrain the movement path of the clamping block 12. The side plate 1123 encloses the sides of the first guide plate 1121 and the second guide plate 1122 to form a closed sliding gap. Since the first guide plate 1121 and the second guide plate 1122 limit the clamping block 12 from the upper and lower sides, and the side plate 1123 limits the clamping block 12 from the side, the clamping block 12 can only move within the sliding gap formed by the guide frame 112. This precisely limits the movement path of the clamping block 12, allowing it to move linearly only between the extended and retracted positions, thus avoiding the risk that the clamping block 12 might tilt and fail to clamp the lower drill rod 4.

[0082] like Figure 2 As shown, the limiting member 13 in this embodiment includes a first limiting block 131 and a second limiting block 132.

[0083] The first limiting block 131 and the second limiting block 132 are both located on the working platform of the drill frame 2 and are located on both sides of the guide frame 112.

[0084] Understandably, in order to save installation space for the chuck mechanism, the limiting member 13 in this embodiment includes a first limiting block 131 and a second limiting block 132. Both the first limiting block 131 and the second limiting block 132 are strip-shaped blocks, with two strip-shaped holes respectively disposed on both sides of the guide frame 112.

[0085] When the guide frame 112 swings around the central hole, when it swings to the first limiting block 131 and the second limiting block 132, it is stopped by the side of the guide frame 112 near the first limiting block 131 and the second limiting block 132, so the guide frame 112 can only swing within the first limiting block 131 and the second limiting block 132.

[0086] like Figure 6 As shown, the clamping block 12 in this embodiment includes a body 121 and a clamping part 122. There are two clamping parts 122, which are respectively connected to the body 121. A clamping opening is formed between the two clamping parts 122, and parallel clamping surfaces are formed on opposite sides of the clamping parts 122 to adapt to the flat opening of the lower drill rod 4.

[0087] Understandably, a flat opening is provided at the end of the lower drill rod 4 near the connector, and the flat opening forms a flat clamping groove. The clamping surfaces formed by the opposite sides of the two clamping parts 122 can tightly clamp the flat openings on opposite sides of the lower drill rod 4, and due to the surface contact between the clamping surfaces and the flat openings, the lower drill rod 4 can be stably clamped to prevent the lower drill rod 4 from rotating with the upper drill rod 3, thus preventing the upper drill rod 3 and the lower drill rod 4 from being unable to be screwed together.

[0088] Furthermore, since other parts of the lower drill rod 4 are still curved, the connection between the two clamping parts 122 and the body 121 is still set as an arc connection to achieve a good fit with the outer wall of the lower drill rod 4.

[0089] like Figure 6 As shown, the card block 12 in this embodiment has various specifications, and the diameter of the clamping opening of the card block 12 of different specifications is different.

[0090] Understandably, since the lower drill rod 4 comes in various specifications, the outer diameters of different specifications of lower drill rod 4 are different. In this embodiment, the clamping block 12 is also provided in different specifications to accommodate lower drill rod 4 of different specifications. The outer diameters of the clamping blocks 12 of different specifications are the same, and they are fitted and installed with the guide frame 112, differing only in the diameter of the clamping opening, to stably clamp lower drill rod 4 of different outer diameters. When connecting or disconnecting lower drill rod 4 of different specifications, only the corresponding clamping block 12 needs to be replaced, which is convenient and quick.

[0091] like Figure 1As shown, the chuck body 11 of this embodiment also includes a hydraulic cylinder 16; the hydraulic cylinder 16 is installed on the inner wall of the guide frame 112, and the output end of the hydraulic cylinder 16 is connected to the chuck block 12.

[0092] Understandably, in order to control the reciprocating movement of the chuck block 12, this embodiment also provides a hydraulic cylinder 16 on the chuck body 11. The hydraulic cylinder 16 can output a large thrust and pull force to achieve smooth and precise motion control, and has good dust resistance in the drilling operation environment, and can provide a stable and reliable reciprocating push and pull force for the chuck block 12.

[0093] like Figure 1 As shown, the chuck body 11 of this embodiment also includes a dust cover 113; the dust cover 113 is installed on the top of the guide frame 112.

[0094] Understandably, since dust is present during drilling and drill rod connection and disconnection, in order to ensure that the inside of the chuck body 11 is not contaminated, this embodiment provides a dust cover 113 on the top of the guide frame 112. The dust cover 113 can completely seal the top of the guide frame 112 and prevent dust from entering.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A chuck mechanism for a roller cone drill, characterized in that, include: The chuck body includes a clamping assembly and a guide frame. The clamping assembly passes through the center hole of the work platform of the drill frame. The clamping assembly has a through hole for accommodating the lower drill rod. The clamping assembly is connected to the guide frame. The clamping assembly can drive the guide frame to rotate around the central axis of the center hole. A sliding gap is formed in the guide frame. A clamping block is movably disposed within the sliding gap along the radial direction of the central hole, and the clamping block is formed with a clamping opening for clamping the lower drill rod; A limiting component is provided on the working platform of the drill frame and spaced apart from the chuck body. The limiting component includes a first limiting block and a second limiting block. The first limiting block and the second limiting block are both provided on the working platform of the drill frame and are respectively located on both sides of the guide frame. The limiting component is used to limit the guide frame to swing within the first limiting block and the second limiting block.

2. The chuck mechanism for a rotary drill rig according to claim 1, characterized in that, The clamping assembly includes: A base plate is provided on the upper side of the working platform of the drill frame. The base plate has mounting holes, and the guide frame is connected to the upper side of the base plate. The positioning cylinder has its upper end inserted into the mounting hole and its lower end located on the lower side of the working platform of the drill frame. The inner wall of the positioning cylinder forms the through hole.

3. The chuck mechanism for a rotary drill rig according to claim 2, characterized in that, Also includes: Hoop; The positioning cylinder has a positioning groove along its circumference at one end away from the base plate, and the clamp is installed in the positioning groove; The base plate and the clamp respectively constrain the axial displacement of the positioning cylinder from both ends of the positioning cylinder.

4. The chuck mechanism for a rotary drill rig according to claim 2, characterized in that, Also includes: Positioning sleeve; The positioning sleeve includes a positioning flange and a cylindrical body; The positioning flange is connected to the cylinder body, the positioning flange is pressed onto the top surface of the positioning cylinder, and the cylinder body is inserted into the through hole; The positioning sleeve comes in various sizes, and the inner diameter of the positioning sleeve varies with the size of the sleeve.

5. The chuck mechanism for a rotary drill rig according to claim 2, characterized in that, The guide frame includes: A first guide plate is disposed on the upper side of the base plate; The second guide plate is spaced apart from the first guide plate, and the sliding gap is formed between the first guide plate and the second guide plate. The side plate is connected to the first guide plate and the second guide plate.

6. The chuck mechanism for a rotary drill rig according to claim 1, characterized in that, The card block includes: ontology; The clamping part has two clamping parts, which are respectively connected to the body. The clamping opening is formed between the two clamping parts, and the opposite sides of the clamping parts form parallel clamping surfaces to adapt to the flat opening of the lower drill rod.

7. The chuck mechanism for a rotary drill rig according to claim 6, characterized in that, The card blocks are available in various sizes, and the clamping openings of the card blocks of different sizes have different diameters.

8. The chuck mechanism for a rotary drill rig according to claim 1, characterized in that, The chuck body also includes a hydraulic cylinder; The hydraulic cylinder is installed on the inner wall of the guide frame, and the output end of the hydraulic cylinder is connected to the locking block.

9. The chuck mechanism for a rotary drill rig according to claim 1, characterized in that, The chuck body also includes: a dust cover; The dust cover is installed on the top of the guide frame.

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