Drilling pipe joint

Abstract

The application relates to the field of drilling equipment and discloses a drilling pipe string joint, which comprises a connecting head connected with a drilling machine, a connecting device arranged at the lower end of the connecting head and used for fixing the connecting head with a drill rod, the connecting device comprising a connecting rod connected with the connecting head, an adjusting connecting piece arranged in the connecting rod, a fixing piece detachably fixed on the drill rod and connected with the connecting head and used for connecting the drill rod with the connecting head, and a limiting piece arranged at the lower end of the connecting piece and abutting against the inner wall of the drill rod and used for fixing the inner part of the drill rod. The application can tightly abut against the inner wall of the drill rod, effectively reduces the loosening and falling of the joint during the drilling process, ensures the safety and stability of the drilling operation, improves the efficiency and safety of the drilling operation, has a wide market application prospect and remarkable economic benefits.

Description

Technical Field

[0001] This invention relates to the field of drilling equipment technology, specifically to drilling string connectors. Background Technology

[0002] Drilling is a crucial part of the exploration and development of resources such as oil and natural gas. As a core component in drilling operations, the design and performance of the drilling string's joints directly affect the efficiency and safety of the drilling process. Current methods for installing drill bits in piling machines involve inserting one end of the drill bit into the mounting hole of the drilling rig, and then rotating it to clamp the drill bit using a mechanism within the mounting head, thus fixing the drill bit in the mounting hole.

[0003] The existing equipment has the following disadvantages: However, when drilling into relatively firm ground, the drill bit is subjected to greater torsional stress, which causes greater stress at the connection between the drill bit and the connector, increasing the risk of the drill bit and connector falling off.

[0004] Therefore, this application proposes a drilling string connector to solve the aforementioned problems. Summary of the Invention

[0005] The purpose of this invention is to provide a drilling string connector to solve the problem of increased risk of drill bit and connector detachment.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a drilling string connector, comprising a connector for connection to a drilling rig, and a connecting device disposed at the lower end of the connector for fixing the connector to the drill pipe.

[0007] The connecting device includes:

[0008] The connecting rod is connected to the connector.

[0009] The connector is adjustablely disposed inside the connecting rod;

[0010] A fastener, detachably fixed to the drill rod and connected to the connector, is used to connect the drill rod and the connector;

[0011] A limiting component is disposed at the lower end of the connector and abuts against the inner wall of the drill rod. During the rotation of the connector driven by the connector head, it moves towards the inside of the drill rod to fix the inside of the drill rod.

[0012] The connector includes a fixed base that is fixedly connected to the drilling rig, an installation ring fixed at the lower end of the fixed base, and a connecting post fixed inside the installation ring. Fixing blocks are provided at equal angles on the outer circular end face of the installation ring, and the fixing component is connected to the fixing blocks.

[0013] The connecting rod has an arc-shaped moving groove at the position corresponding to the fixed block, and a placement groove for placing the fixed block is provided at the lower end of the connecting rod located in the moving groove. A fixing rod is fixed to the lower end of the connecting rod, and a connecting bearing is provided inside the fixing rod.

[0014] The connector includes a rotating rod sleeved on the connecting bearing, a top plate fixed to the upper end of the rotating rod, and a first insert rod fixed to the upper end of the top plate. The first insert rod is inserted and fixed to the connecting post, and the connecting post has a first insertion hole for placing the first insert rod.

[0015] The lower end of the rotating rod is connected to the limiting member through a transmission component. The transmission component includes a lead screw sleeve disposed at the lower end of the rotating rod and a connecting ring fixed at the lower end of the lead screw sleeve. The connecting ring is connected to the limiting member. A second insert rod is fixed at the lower end of the rotating rod. A second insertion hole for placing the second insert rod is opened at the position corresponding to the second insert rod on the lead screw sleeve.

[0016] The limiting component includes an abutment post placed inside the drill rod, a screw rod fixed to the upper end of the abutment post, a push ring sleeved on the abutment post, and a fixing unit disposed on the abutment post and connected to the push ring. The lead screw sleeve is threadedly connected to the screw rod, the connecting ring is inserted into the push ring, and a limiting plate is provided on one side of the connecting ring located inside the push ring. The push ring has a sliding groove for the limiting plate to move.

[0017] The fixing unit includes a mounting base fixed at equal angles to the outer circular end face of the abutment column, a mounting bracket fixed to the push ring, an adjusting rod rotatably mounted on the mounting bracket, a limiting plate disposed on the side of the adjusting rod away from the mounting bracket, and a stabilizing rod disposed between the limiting plate and the mounting base.

[0018] The lower end of the rotating rod is provided with a connecting groove for placing the screw.

[0019] The fixing component includes a fixing ring sleeved on the drill rod and a fixing plate fixed to the upper end of the fixing ring. The fixing ring is fixedly connected to the drill rod by connecting bolts, and the upper end of the fixing plate is fixedly connected to the fixing block by fixing bolts. The connecting rod has a fixing groove for placing the fixing plate at the position corresponding to the fixing plate.

[0020] The drill rod has a ring fixed at its upper end, which is inserted into the inside of the fixing rod. The drill rod has a threaded hole for fixing the connecting bolt, and the inner wall of the ring has a limiting groove for limiting the limiting plate at the position corresponding to the limiting plate.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. This invention, by setting up this device, can simultaneously fix the inner and outer walls of the drill pipe, achieving a firm connection between the connector and the drill pipe. In particular, the design of the limiting component can tightly abut against the inner wall of the drill pipe, effectively reducing the loosening and detachment of the joint during the drilling process, ensuring the safety and stability of drilling operations, improving the efficiency and safety of drilling operations, and has broad market application prospects and significant economic benefits.

[0023] 2. This invention uses a mounting bracket to push the ring up and down on the abutment post, which in turn causes the adjusting rod to drive the limiting plate to expand outward. The limiting plate then abuts and is fixed in the inner wall of the drill rod and is fixed at an equal angle to the mounting seat on the outer circular end face of the abutment post. This ensures the stability and uniform distribution of the entire structure on the abutment post, avoiding structural tilting or loosening caused by uneven fixing. The setting of the stabilizing rod further enhances the connection stability between the limiting plate and the mounting seat, making the entire structure more stable under stress and improving the overall reliability and durability. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the main structure in one embodiment of the present invention;

[0025] Figure 2 This is a frontal structural schematic diagram of an embodiment of the present invention;

[0026] Figure 3 This is a cross-sectional structural schematic diagram of one embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of an explosion in one embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the structure of the bottom of the explosion in one embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of the structure of the fixing base in one embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram of the connecting rod in one embodiment of the present invention;

[0031] Figure 8 This is a schematic diagram of the connector structure in one embodiment of the present invention;

[0032] Figure 9 This is a schematic diagram of the transmission component in one embodiment of the present invention;

[0033] Figure 10 This is a schematic diagram of the structure of the limiting member in one embodiment of the present invention;

[0034] Figure 11 This is a schematic diagram of the drill pipe structure in one embodiment of the present invention;

[0035] Figure 12 This is a schematic diagram of the connection between the connector and the limiting member in one embodiment of the present invention;

[0036] Figure 13 This is a schematic diagram of the connection between the transmission component and the push ring in one embodiment of the present invention;

[0037] Figure 14 This is a schematic diagram of the connection between the connector and the fixed base in one embodiment of the present invention;

[0038] Figure 15 This is a schematic diagram of the connection between the limiting member and the insertion ring in one embodiment of the present invention.

[0039] In the diagram: 1. Connector; 11. Fixing seat; 12. Mounting ring; 121. Fixing block; 13. Fixing bolt; 14. Connecting column; 1401. First insertion hole; 2. Connecting device; 21. Connecting rod; 2101. Moving groove; 2102. Placement groove; 2103. Fixing groove; 22. Fixing rod; 23. Connecting bearing; 24. Connecting piece; 241. Rotating rod; 24101. Connecting groove; 242. Top plate; 243. First insertion rod; 244. Second insertion rod; 25. Transmission component; 251 1. Screw sleeve; 25101. Second insertion hole; 252. Connecting ring; 2521. Limiting plate; 26. Limiting component; 261. Abutment post; 262. Screw; 263. Push ring; 26301. Slide groove; 264. Mounting bracket; 265. Adjusting rod; 266. Limiting plate; 267. Stabilizing rod; 268. Mounting seat; 27. Fixing component; 271. Fixing ring; 272. Fixing plate; 273. Connecting bolt; 3. Drill rod; 301. Threaded hole; 31. Insertion ring; 3101. Limiting groove. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Please see Figure 1-15The present invention provides a technical solution: a drilling string connector, including a connector 1 connected to a drilling rig, and a connecting device 2 disposed at the lower end of the connector 1 for fixing the connector 1 to the drill pipe 3.

[0042] The connecting device 2 includes:

[0043] Connecting rod 21 is connected to connector 1;

[0044] Connector 24 is adjustablely disposed inside connecting rod 21;

[0045] The fastener 27 is detachably fixed to the drill rod 3 and connected to the connector 1, and is used to connect the drill rod 3 and the connector 1.

[0046] The limiting member 26 is located at the lower end of the connector 24 and abuts against the inner wall of the drill rod 3. During the rotation of the connector 24 driven by the connector 1, it moves towards the inside of the drill rod 3 to fix the inside of the drill rod 3.

[0047] It should be noted that during operation, the connecting rod 21 is first inserted into the upper end of the drill rod 3, then the limiting member 26 is installed in the set position of the drill rod 3, and then the fixing member 27 is fixed to the drill rod 3. The connector 1 is then inserted into the upper end of the connecting rod 21, and then the connector 1 is rotated, causing the connector 1 to rotate inside the connecting rod 21 while moving downwards. During the rotation of the connector 1, the connecting member 24 is driven to rotate, which in turn causes the limiting member 26 connected to the lower end of the connecting member 24 to expand outwards, and then abut against and fix to the inner wall of the drill rod 3. When connector 1 moves down to its lowest point, fixing member 27 connects to connector 1 and then fixes connector 27 to connector 1. By setting this device, the inner and outer walls of drill pipe 3 can be fixed at the same time, realizing a firm connection between connector 1 and drill pipe 3. In particular, the design of limiting member 26 can tightly abut against the inner wall of drill pipe 3, effectively reducing the loosening and falling off of the joint during the drilling process, ensuring the safety and stability of drilling operations, improving the efficiency and safety of drilling operations, and having broad market application prospects and significant economic benefits.

[0048] In one embodiment, the connector 1 includes a fixed base 11 fixedly connected to the drilling machine, a mounting ring 12 fixed at the lower end of the fixed base 11, and a connecting post 14 fixed inside the mounting ring 12. A fixing block 121 is provided at equal angles on the outer circular end face of the mounting ring 12, and the fixing member 27 is connected to the fixing block 121.

[0049] This design is for reference. Figure 6The fixed base 11 is fixedly connected to the drilling rig, ensuring the stability and reliability of the entire connector 1 and the drilling rig, preventing loosening or detachment during operation. The mounting ring 12 is inserted into the interior of the connecting rod 21 and rotates during downward movement, causing the connecting column 14 to drive the connecting piece 24 connected to its lower end to rotate. Then, when the fixing block 121 on the mounting ring 12 is moved down to the set position, it is connected to the fixing piece 27. Then, the fixing piece 27 is fixedly connected to the fixing block 121. The fixing blocks 121, which are set at equal angles on the outer circular end face of the mounting ring 12, provide clear connection points for the fixing piece 27, making the installation and disassembly process simpler and faster. This design helps to reduce installation time, improve work efficiency, and is also more convenient when maintenance or replacement of parts is required.

[0050] In one embodiment, an arc-shaped moving groove 2101 is provided at the position of the corresponding fixing block 121 on the connecting rod 21, and a placement groove 2102 for placing the fixing block 121 is provided at the lower end of the moving groove 2101 on the connecting rod 21. A fixing rod 22 is fixed at the lower end of the connecting rod 21, and a connecting bearing 23 is provided inside the fixing rod 22.

[0051] This design is for reference. Figure 7 The arc-shaped moving groove 2101 on the connecting rod 21 allows the fixed block 121 to move along the arc-shaped path within it, so that the mounting ring 12 can rotate along the moving groove 2101 during the downward movement and then move into the placement groove 2102. The connecting member 24 is rotatably connected to the inside of the fixed rod 22 through the connecting bearing 23. When the connecting column 14 rotates, it can drive the connecting member 24 to rotate inside the fixed rod 22. This design not only enhances the load-bearing capacity of the entire mechanical system, but also effectively disperses and transmits the load, reducing damage or deformation caused by uneven force.

[0052] In one embodiment, the connector 24 includes a rotating rod 241 sleeved on the connecting bearing 23, a top plate 242 fixed to the upper end of the rotating rod 241, and a first insert rod 243 fixed to the upper end of the top plate 242. The first insert rod 243 is inserted and fixed to the connecting post 14. The connecting post 14 has a first insertion hole 1401 for placing the first insert rod 243.

[0053] This design is for reference. Figure 8When connecting the connector 1 to the connecting device 2, align the first insertion hole 1401 on the connecting post 14 with the first insertion rod 243 on the top plate 242. Then rotate the fixing seat 11 so that the fixing block 121 at the outer end of the mounting ring 12 aligns with the moving groove 2101. Then rotate the fixing seat 11 so that the fixing block 121 moves down along the moving groove 2101 and rotates along the moving groove 2101. The first insertion rod 243 is gradually inserted into the first insertion hole 1401. The connecting post 14 drives the top plate 242 to rotate, which in turn drives the rotating rod 241 to drive the transmission component 25 to rotate. The insertion and fixing design of the first insertion rod 243 and the connecting post 14 ensures a firm connection between the connector 24 and the connector 1. This connection method is not only simple and convenient, but also easy to disassemble, which greatly simplifies the installation and disassembly process, improves work efficiency, and reduces maintenance costs.

[0054] In one embodiment, the lower end of the rotating rod 241 is connected to the limiting member 26 via a transmission member 25. The transmission member 25 includes a lead screw sleeve 251 disposed at the lower end of the rotating rod 241 and a connecting ring 252 fixed at the lower end of the lead screw sleeve 251. The connecting ring 252 is connected to the limiting member 26. A second insertion rod 244 is fixed at the lower end of the rotating rod 241. A second insertion hole 25101 for placing the second insertion rod 244 is provided at the position corresponding to the second insertion rod 244 on the lead screw sleeve 251.

[0055] This design is for reference. Figure 8 ,as well as Figure 9 When assembling the connecting device 2, the second insertion rod 244 at the lower end of the rotating rod 241 is inserted into the second insertion hole 25101 at the upper end of the lead screw sleeve 251, so that the rotating rod 241 is connected to the lead screw sleeve 251. The lead screw sleeve 251 rotates with the rotating rod 241, thereby causing the lead screw sleeve 251 to move on the limiting member 26, and fixing the limiting member 26 inside the drill rod 3.

[0056] In one embodiment, the limiting member 26 includes an abutment post 261 placed inside the drill rod 3, a screw 262 fixed to the upper end of the abutment post 261, a push ring 263 sleeved on the abutment post 261, and a fixing unit disposed on the abutment post 261 and connected to the push ring 263. The lead screw sleeve 251 is threadedly connected to the screw 262. The connecting ring 252 is inserted into the push ring 263. A limiting plate 2521 is provided on the side of the connecting ring 252 located inside the push ring 263. A sliding groove 26301 for the limiting plate 2521 to move is provided on the push ring 263.

[0057] This design is for reference. Figure 4-5 , Figure 10 ,as well as Figure 12The limiting plate 2521 at the lower end of the connecting ring 252 is slidably connected in the groove 26301 in the pushing ring 263. During the rotation of the rotating rod 241, the lead screw sleeve 251 is threadedly connected to the screw 262, allowing the lead screw sleeve 251 to move up and down. This threaded connection between the lead screw sleeve 251 and the screw 262 restricts the longitudinal direction of the lead screw sleeve 251, reducing its slippage on the screw 262 and improving its stability. 1. The stability of the connection between the screw 262 and the fixed unit is improved, thereby improving the stability of the connection between the fixed unit and the inner wall of the drill pipe 3. During the rotation of the screw sleeve 251, the connecting ring 252 can drive the push ring 263 to move up and down on the abutment post 261, thereby causing the fixed unit connected to the push ring 263 to expand outward and abut against and fix in the inner wall of the drill pipe 3. Under the restriction of the limiting plate 2521, the connecting ring 252 can drive the push ring 263 to move up and down with the screw sleeve 251.

[0058] In one embodiment, the fixing unit includes a mounting base 268 fixed at an equal angle to the outer circular end face of the abutment post 261, a mounting bracket 264 fixed to the push ring 263, an adjusting rod 265 rotatably disposed on the mounting bracket 264, a limiting plate 266 disposed on the side of the adjusting rod 265 away from the mounting bracket 264, and a stabilizing rod 267 disposed between the limiting plate 266 and the mounting base 268.

[0059] This design is for reference. Figure 10 ,as well as Figure 12 The mounting bracket 264 pushes the ring 263 up and down on the abutment post 261, which causes the adjusting rod 265 to drive the limiting plate 266 to expand outward. Then the limiting plate 266 abuts and is fixed in the inner wall of the drill rod 3. The mounting seat 268 is fixed at an equal angle to the outer end face of the abutment post 261, which can ensure the stability and uniform distribution of the entire structure on the abutment post 261, and avoid structural tilting or loosening caused by uneven fixing. The setting of the stabilizing rod 267 further enhances the connection stability between the limiting plate 266 and the mounting seat 268, making the entire structure more stable when under force, and improving the overall reliability and durability.

[0060] In one embodiment, the lower end of the rotating rod 241 is provided with a connecting groove 24101 for placing the screw 262.

[0061] This design is for reference. Figure 13 The connecting groove 24101 provides a precise placement position for the screw 262 and provides space for the screw 262 to move, which greatly simplifies the assembly process and improves work efficiency.

[0062] In one embodiment, the fixing member 27 includes a fixing ring 271 sleeved on the drill rod 3 and a fixing plate 272 fixed to the upper end of the fixing ring 271. The fixing ring 271 is fixedly connected to the drill rod 3 by a connecting bolt 273. The upper end of the fixing plate 272 is fixedly connected to the fixing block 121 by a fixing bolt 13. A fixing groove 2103 for placing the fixing plate 272 is provided at the position of the connecting rod 21 corresponding to the fixing plate 272.

[0063] This design is for reference. Figure 5 The fixing ring 271 is tightly fitted onto the drill rod 3 and fixedly connected to the drill rod 3 by the connecting bolt 273, ensuring the stability of the fixing part 27 on the drill rod 3 and preventing loosening or falling off due to vibration or external force during use. After the fixing block 121 at the upper end of the mounting ring 12 moves down to the lowest point, it is connected to the fixing plate 272. Then, the fixing block 121 and the fixing plate 272 are fixed by the fixing bolt 13, realizing the fixing work between the outside of the drill rod 3 and the connector 1. When the fixing block 121 and the fixing plate 272 are aligned, the rotating rod 241 drives the limiting plate 266 to abut and fix in the inner wall of the drill rod 3, realizing the fixing work inside the drill rod 3, enhancing the strength and stability of the entire structure. This design enables the drill rod 3 to maintain stable performance when subjected to large torque or pressure.

[0064] In one embodiment, a ring 31 is fixed to the upper end of the drill rod 3. The ring 31 is inserted into the inside of the fixed rod 22. The drill rod 3 has a threaded hole 301 for fixing the connecting bolt 273. A limiting groove 3101 for limiting the limiting plate 266 is provided at the corresponding position of the limiting plate 266 on the inner wall of the ring 31.

[0065] This design is for reference. Figure 11 The insert ring 31 is inserted into the inside of the fixed rod 22. This insertion connection method is not only simple and easy to implement, but also provides stable support and positioning, avoiding shaking or falling off due to unstable connection. The limiting groove 3101 opened on the inner wall of the insert ring 31 matches the limiting plate 266, effectively limiting the limiting plate 266. This not only prevents the limiting plate 266 from moving randomly during the operation of the drill rod 3, but also ensures the stability and safety of the entire mechanical system. At the same time, the limiting groove 3101 also plays a guiding role for the limiting plate 266, enabling the limiting plate 266 to move along a predetermined trajectory.

[0066] Furthermore, if the embodiments involve descriptions such as "first," "second," etc., these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relation to the specification. The significance or implied number of the indicated technical features is not specified. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

Claims

1. A drilling string connector, comprising a connector (1) for connection to a drilling rig, and a connecting device (2) disposed at the lower end of the connector (1) for fixing the connector (1) to a drill pipe (3), characterized in that: The connecting device (2) includes: The connecting rod (21) is connected to the connecting head (1); The connector (24) is adjustablely disposed inside the connecting rod (21); The fastener (27) is detachably fixed to the drill rod (3) and connected to the connector (1) for connecting the drill rod (3) and the connector (1); The limiting member (26) is located at the lower end of the connector (24) and abuts against the inner wall of the drill rod (3). During the rotation of the connector (1) and the connector (24), it moves towards the inside of the drill rod (3) to fix the inside of the drill rod (3). The connector (1) includes a fixed base (11) fixedly connected to the drilling machine, an installation ring (12) fixed at the lower end of the fixed base (11) and a connecting column (14) fixed inside the installation ring (12). The outer circular end face of the installation ring (12) is provided with a fixing block (121) at equal angles. The fixing member (27) is connected to the fixing block (121). An arc-shaped moving groove (2101) is provided on the connecting rod (21) at the position corresponding to the fixed block (121). A placement groove (2102) for placing the fixed block (121) is provided on the lower end of the connecting rod (2101). A fixing rod (22) is fixed to the lower end of the connecting rod (21). A connecting bearing (23) is provided inside the fixing rod (22). The connector (24) includes a rotating rod (241) sleeved on the connecting bearing (23), a top plate (242) fixed to the upper end of the rotating rod (241), and a first insert rod (243) fixed to the upper end of the top plate (242). The first insert rod (243) is inserted and fixed to the connecting post (14). The connecting post (14) has a first insertion hole (1401) for placing the first insert rod (243).

2. The drilling string connector according to claim 1, characterized in that: The lower end of the rotating rod (241) is connected to the limiting member (26) through the transmission member (25). The transmission member (25) includes a lead screw sleeve (251) disposed at the lower end of the rotating rod (241) and a connecting ring (252) fixed at the lower end of the lead screw sleeve (251). The connecting ring (252) is connected to the limiting member (26). A second insert rod (244) is fixed at the lower end of the rotating rod (241). A second insertion hole (25101) for placing the second insert rod (244) is opened on the lead screw sleeve (251) at the position corresponding to the second insert rod (244).

3. The drilling string connector according to claim 2, characterized in that: The limiting component (26) includes an abutment post (261) placed inside the drill rod (3), a screw (262) fixed to the upper end of the abutment post (261), a push ring (263) sleeved on the abutment post (261), and a fixing unit set on the abutment post (261) and connected to the push ring (263). The screw sleeve (251) is threadedly connected to the screw (262). The connecting ring (252) is inserted into the push ring (263). A limiting plate (2521) is provided on one side of the connecting ring (252) located inside the push ring (263). A sliding groove (26301) is provided on the push ring (263) for the limiting plate (2521) to move.

4. The drilling string connector according to claim 3, characterized in that: The fixing unit includes a mounting base (268) fixed at equal angles to the outer circular end face of the abutment post (261), a mounting bracket (264) fixed to the push ring (263), an adjusting rod (265) rotatably mounted on the mounting bracket (264), a limiting plate (266) disposed on the side of the adjusting rod (265) away from the mounting bracket (264), and a stabilizing rod (267) disposed between the limiting plate (266) and the mounting base (268).

5. The drilling string connector according to claim 4, characterized in that: The lower end of the rotating rod (241) is provided with a connecting groove (24101) for placing the screw (262).

6. The drilling string connector according to claim 5, characterized in that: The fixing component (27) includes a fixing ring (271) sleeved on the drill rod (3) and a fixing plate (272) fixed to the upper end of the fixing ring (271). The fixing ring (271) is fixedly connected to the drill rod (3) by connecting bolts (273). The upper end of the fixing plate (272) is fixedly connected to the fixing block (121) by fixing bolts (13). The connecting rod (21) has a fixing groove (2103) for placing the fixing plate (272) at the position corresponding to the fixing plate (272).

7. The drilling string connector according to claim 6, characterized in that: The upper end of the drill rod (3) is fixed with a plug ring (31), which is inserted into the inside of the fixing rod (22). The drill rod (3) has a threaded hole (301) for fixing the connecting bolt (273), and a limiting groove (3101) for limiting the limiting plate (266) is provided on the inner wall of the plug ring (31) at the position corresponding to the limiting plate (266).

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