Drill rod hoisting connecting piece

Abstract

The utility model discloses a drill rod hoisting connecting piece, which belongs to the field of drill rod hoisting connecting pieces, and comprises a drill rod connecting part, a steel wire rope connecting part and a middle connecting piece, and the middle connecting piece comprises a first bolt, a main shaft, a second bolt, a thrust nut, a fastening circular ring, a dust cover and a bearing. The dustproof cover of the middle connecting piece and the main shaft can rotate relatively, so that when the equipment is used for disassembling and assembling the drill rod by rotating the drill rod connecting part, the steel wire rope connecting part cannot be driven to rotate together, the drill rod can be disassembled and assembled conveniently, and meanwhile, due to the fact that the main shaft and the drill rod connecting part are detachable, when drill rods of different models and styles are used, the drill rod can be disassembled and assembled conveniently. The drill rod connecting part can be replaced by independently detaching the drill rod connecting part, inconvenience caused by unfastening and binding a steel wire rope again is avoided, due to the split type connecting piece structure, when part of the connecting piece is damaged, the part needing to be replaced can be independently detached for independent replacement, rapid maintenance is facilitated, and meanwhile the use cost can be saved.

Description

Technical Field

[0001] The utility model belongs to the field of drill pipe lifting connectors, and particularly relates to a drill pipe lifting connector. Background Art

[0002] A drill pipe is a steel pipe with threads at the tail, which is used to connect the surface equipment of a drilling rig and the drilling and grinding equipment or downhole device at the bottom of the well. The purpose of the drill pipe is to transport drilling mud to the drill bit and, together with the drill bit, raise, lower or rotate the downhole device. When the drill pipe is lifted, since its tail end cannot be directly connected to the steel wire rope, a lifting connector is mostly used to connect with the steel wire rope. However, in the prior art, when in use, the current drill pipe lifting connection device adopts an integral design, with a threaded female head for connecting the drill pipe at its lower end and a hole for the steel wire rope to pass through at its upper end. Due to the depth requirement of drilling operations, the number of drill pipes of a raise borer needs to be increased or decreased according to the actual situation. However, considering that the existing connection device is an integral structure, after each drill pipe lifting is completed and transferred to the designated position, the steel wire rope must be untied first, and then the female head of the lifting device is rotated to the next drill pipe and the steel wire rope is fixed again. The repetition of this process results in a large amount of time being consumed in the disassembly of the steel wire rope, thereby reducing the efficiency of on-site drill pipe lifting operations. Moreover, since the traditional connector adopts an integral form, and drill pipes have different diameters or different threaded joints due to different models and styles, different connectors are required for lifting different drill pipes, so the steel wire rope needs to be untied and replaced, which is time-consuming and laborious, and rather cumbersome and inconvenient. At the same time, when the connector is damaged, the entire connector also needs to be replaced, which is costly and also rather inconvenient. Summary of the Utility Model

[0003] (1) Technical Problems to be Solved

[0004] In order to overcome the deficiencies of the prior art, a drill pipe lifting connector is proposed to solve the situation that in the prior art, when in use, the current drill pipe lifting connection device adopts an integral design, with a threaded female head for connecting the drill pipe at its lower end and a hole for the steel wire rope to pass through at its upper end. Due to the depth requirement of drilling operations, the number of drill pipes of a raise borer needs to be increased or decreased according to the actual situation. However, considering that the existing connection device is an integral structure, after each drill pipe lifting is completed and transferred to the designated position, the steel wire rope must be untied first, and then the female head of the lifting device is rotated to the next drill pipe and the steel wire rope is fixed again. The repetition of this process results in a large amount of time being consumed in the disassembly of the steel wire rope, thereby reducing the efficiency of on-site drill pipe lifting operations.

[0005] Secondly, in order to solve the problem that the traditional connecting parts adopt an integrated form, and the drill rods have different diameters or different threaded joints due to different models and styles, different connecting parts will be used when lifting different drill rods, so it is necessary to untie the wire rope for replacement, which is time-consuming, labor-intensive, cumbersome and inconvenient. At the same time, when the connecting part is damaged, it is also necessary to replace the entire connecting part, which is costly and inconvenient.

[0006] (II) Technical solution

[0007] The utility model is implemented through the following technical solutions: The utility model proposes a drill rod lifting connector, the structure of which includes a drill rod connecting part and a wire rope connecting part, the drill rod connecting part is used to connect the drill rod of the drilling rig, and the wire rope connecting part is used to connect with the lifting equipment through the wire rope;

[0008] It also includes an intermediate connecting piece, which is used to connect the drill rod connecting part and the wire rope connecting part;

[0009] The intermediate connecting part is composed of a first bolt, a main shaft, a second bolt, a thrust nut, a fastening ring, a dust cover and a bearing. The main shaft is in the shape of a Chinese character "中". The dust cover is covered and sleeved on the upper side of the main shaft. The top of the dust cover is covered by a wire rope connecting part and locked by a first bolt. The upper part of the main shaft located inside the dust cover is also sleeved with a bearing. The main shaft can rotate relative to the dust cover. The bottom of the main shaft passes through the bottom of the dust cover and the top of the drill rod connecting part, and is locked with a fastening ring and a thrust nut. The thrust nut is located on the side of the fastening ring away from the dust cover. The second bolt is used to lock the fastening ring and the drill rod connecting part.

[0010] Furthermore, the main shaft is composed of a rod body, a convex ring and a first threaded groove. A circle of convex rings is integrated on the upper side of the rod body. The rod body and the convex ring form a Chinese character "中" (center). The first threaded groove is arranged on the lower side of the side end of the rod body. The rod body is locked with a thrust nut and a fastening ring through the first threaded groove. The rod body and the convex ring are arranged in a dust cover.

[0011] Furthermore, the rod body is provided with bearings on both upper and lower sides of the convex ring, and the bearings are arranged in a dust cover to prevent environmental pollutants from contaminating the rod body, the convex ring and the bearings, so as to ensure smooth rotation of the rod body.

[0012] Furthermore, the fastening ring is composed of a ring body, a first locking hole and a second thread groove. The second thread groove is provided at the inner ring end of the ring body, and the ring body is meshed with the first thread groove through the second thread groove. More than one of the first locking holes is penetrated through the ring body, and the second bolt passes through the drill rod connecting part and is locked with the first locking hole to achieve the stability of the connecting part between the rod body and the drill rod. At the same time, since the locking direction of the rod body and the ring body is opposite to the locking direction of the ring body and the second bolt, better stability can be obtained when subjected to force.

[0013] Furthermore, the dust cover is composed of a first inner groove, a first through hole, a cover body and a second locking hole. The first inner groove is provided in the middle of the top end of the cover body, and the top of the first inner groove passes through the cover body. The second locking hole is also provided on the side of the top end of the cover body. The first through hole is passed through the middle of the bottom end of the cover body. The first inner groove is communicated with the first through hole. The diameter of the first inner groove is smaller than the diameter of the first through hole. The rod body, the convex ring and the bearing are all arranged in the first inner groove. The wire rope connecting part is locked with the second locking hole by a first bolt, and the rod body passes through the first through hole and cooperates with the gap of the first through hole.

[0014] Furthermore, the rod body is a cylinder, the convex ring is a circular ring, and the top height of the rod body when it is located in the first inner groove is equal to or lower than the top of the first inner groove. It is optimal when the top height of the rod body when it is located in the first inner groove is equal to the top of the first inner groove, thereby reducing the shaking of the rod body after the connection with the dust cover and ensuring stability when subjected to force.

[0015] Furthermore, the drill rod connecting part is composed of a third thread groove, a drill rod connecting piece, a second inner groove, a first connecting hole and a second through hole, the bottom end of the drill rod connecting piece is provided with a second inner groove, the second inner groove passes through the bottom of the drill rod connecting piece, the top of the drill rod connecting piece is penetrated by a first connecting hole and a second through hole, the first connecting hole and the second through hole are both communicated with the second inner groove, the second through hole is located in the middle of the drill rod connecting piece, the bottom of the rod body passes through the second through hole and is locked with the second thread groove and the thrust nut through the first thread groove, the rod body and the second through hole are clearance-matched, more than one first connecting hole is provided, and more than one first connecting hole is evenly arranged around the second through hole, the second bolt passes through the first connecting hole and is locked with the first locking hole, the second bolt and the first connecting hole are clearance-matched, and a third thread groove is also provided on the lower side of the drill rod connecting piece, the third thread groove is used to lock with the drill rod of the drilling rig, so that the drill rod can also be against the bottom of the rod body when assembled, further ensuring the stability of the rod body assembly.

[0016] Furthermore, the third thread groove can be an external thread or an internal thread. When the third thread groove is an external thread, the third thread groove is arranged on the lower side of the side end of the drill rod connecting part. When the third thread groove is an internal thread, the third thread groove is arranged on the lower side of the side end of the second inner groove to adapt to different drilling rig drill rods.

[0017] Furthermore, the wire rope connecting part is composed of a hanging ear, a hanging hole, a pressure cover and a second connecting hole. At least one hanging ear is fixed on the top of the pressure cover. The hanging ear is penetrated by a hanging hole. The hanging hole is used for assembling the wire rope. The pressure cover is sealed on the top of the cover body. The area of ​​the pressure cover is larger than the area of ​​the first inner groove. The pressure cover is provided with an equal number of second connecting holes corresponding to the second lock hole position.

[0018] Further, a convex block which is in clearance fit with the first inner groove may be provided at the bottom of the gland, and a sealing ring may be additionally arranged between the convex block and the first inner groove for sealing, which can ensure the sealing performance and better prevent the lateral deviation of the gland, thus strengthening the stability.

[0019] (III) Beneficial effects

[0020] One of the above technical solutions has the following advantages or beneficial effects:

[0021] To solve the problem that in the prior art during use, the current drill pipe hoisting connection device adopts an integral design, with a threaded female head for connecting the drill pipe at its lower end and a hole for the steel wire rope to pass through at its upper end. Due to the depth requirement of the drilling operation, the number of drill pipes of the raise borer needs to be increased or decreased according to the actual situation. However, considering that the existing connection device is an integrated structure, after each drill pipe hoisting and transfer to the designated position, the steel wire rope must be untied first, and then the female head of the hoisting device is rotated to the next drill pipe and the steel wire rope is fixed again. The repetition of this process results in a large amount of time being consumed in the disassembly of the steel wire rope, thus reducing the efficiency of the on-site drill pipe hoisting operation. Moreover, because the traditional connector is in an integral form, and the drill pipes have different diameters or different threaded joints due to different models and styles, different connectors are required for hoisting different drill pipes, so the steel wire rope needs to be untied and replaced, which is time-consuming and laborious and rather cumbersome and inconvenient. At the same time, when the connector is damaged, the entire connector also needs to be replaced, with high costs and inconvenience. By providing a split connector, the connector is divided into three parts: a drill pipe connection part, a steel wire rope connection part, and an intermediate connector. The intermediate connector adopts a combination of a dust cover and a main shaft and can rotate relatively, so that when the drill pipe connection part is rotated for drill pipe disassembly and assembly, the steel wire rope connection part will not be driven to rotate together, realizing convenient drill pipe disassembly and assembly. At the same time, since the main shaft is detachable from the drill pipe connection part, when different models and styles of drill pipes are used, the drill pipe connection part can be separately disassembled and replaced, avoiding the inconvenience of re-untieing and tying the steel wire rope. And due to the split connector structure, when part of the connector is damaged, the part to be replaced can be separately disassembled and replaced separately, which is convenient for quick repair and can save the use cost. At the same time, when hoisting and bearing force, the force above the main shaft acts on the bearing, which can reduce the influence of rotation. At the same time, the bottom of the main shaft adopts a structure of a fastening ring combined with a thrust nut for locking, with more stable locking and preventing loosening. The fastening ring is locked by a second bolt and the locking direction is opposite to the direction in which the fastening ring locks the main shaft, further strengthening the stability of the fastening ring assembly and better preventing loosening. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] By reading the following detailed description of the non-restrictive embodiments with reference to the accompanying drawings, other features, objects, and advantages of the present invention will become more apparent:

[0023] Figure 1 This is a schematic structural view of a drill pipe lifting connector of the present utility model;

[0024] Figure 2 This is a schematic sectional view of the side view of the present utility model;

[0025] Figure 3 This is a schematic structural view of the front view of the main shaft of the present utility model;

[0026] Figure 4 This is a schematic structural view of the fastening ring of the present utility model;

[0027] Figure 5 This is a schematic sectional view of the front view of the dust cover of the present utility model;

[0028] Figure 6 This is a schematic structural view of the top view of the dust cover of the present utility model;

[0029] Figure 7 This is a schematic sectional view of the front view of the drill pipe connection part of the present utility model;

[0030] Figure 8 This is a schematic sectional view of the front view of the wire rope connection part of the present utility model;

[0031] Figure 9 This is a schematic sectional view of the side view of the wire rope connection part of the present utility model;

[0032] In the figure: drill pipe connection part - 1, wire rope connection part - 2, intermediate connector - 3, third thread groove - 1a, drill pipe connector - 1b, second inner groove - 1c, first connection hole - 1d, second through hole - 1e, hanging ear - 2a, hanging hole - 2b, gland - 2c, convex block - 2d, second connection hole - 2e, first bolt - 3a, main shaft - 3b, second bolt - 3c, thrust nut - 3d, fastening ring - 3e, dust cover - 3f, bearing - 3g, rod body - 3b1, convex ring - 3b2, first thread groove - 3b3, ring body - 3e1, first locking hole - 3e2, second thread groove - 3e3, first inner groove - 3f1, first through hole - 3f2, cover body - 3f3, second locking hole - 3f4. Detailed implementation manners

[0033] The present utility model will be further described in detail below in conjunction with embodiments, but the implementation manners of the present utility model are not limited thereto.

[0034] The present utility model provides a drill pipe lifting connector: its structure includes a drill pipe connection part 1 and a wire rope connection part 2. The drill pipe connection part 1 is used to connect the drill pipe of the drilling rig, and the wire rope connection part 2 is used to connect with the lifting equipment through a wire rope;

[0035] It further includes an intermediate connector 3, and the intermediate connector 3 is used to connect the drill pipe connection part 1 and the wire rope connection part 2;

[0036] The intermediate connector 3 is composed of a first bolt 3a, a main shaft 3b, a second bolt 3c, a thrust nut 3d, a fastening ring 3e, a dust cover 3f and a bearing 3g. The main shaft 3b is in the shape of a Chinese character 'zhong'. The dust cover 3f is sleeved on the upper side of the main shaft 3b. The top of the dust cover 3f is covered by the wire rope connection part 2 and locked by the first bolt 3a. A bearing 3g is also sleeved on the upper part of the main shaft 3b inside the dust cover 3f. The main shaft 3b can rotate relative to the dust cover 3f. The bottom of the main shaft 3b penetrates through the bottom of the dust cover 3f and the top of the drill pipe connection part 1 and then is locked with a fastening ring 3e and a thrust nut 3d. The thrust nut 3d is located on the side of the fastening ring 3e away from the dust cover 3f. The second bolt 3c is used to lock the fastening ring 3e and the drill pipe connection part 1.

[0037] Wherein, the main shaft 3b is composed of a rod body 3b1, a convex ring 3b2 and a first thread groove 3b3. A circle of convex rings 3b2 is integrally arranged on the upper side of the rod body 3b1. The rod body 3b1 and the convex ring 3b2 form the shape of a Chinese character 'zhong'. The first thread groove 3b3 is arranged on the lower side of the side end of the rod body 3b1. The rod body 3b1 is locked with the thrust nut 3d and the fastening ring 3e through the first thread groove 3b3. The rod body 3b1 and the convex ring 3b2 are arranged inside the dust cover 3f.

[0038] Wherein, bearings 3g are sleeved on both the upper and lower sides of the rod body 3b1 where the convex ring 3b2 is provided. The bearings 3g are arranged inside the dust cover 3f to prevent environmental pollutants from contaminating the rod body 3b1, the convex ring 3b2 and the bearings 3g, so as to ensure the smooth rotation of the rod body 3b1.

[0039] Wherein, the fastening ring 3e is composed of a ring body 3e1, a first locking hole 3e2 and a second thread groove 3e3. A second thread groove 3e3 is arranged at the inner ring end of the ring body 3e1. The ring body 3e1 is meshed with the first thread groove 3b3 through the second thread groove 3e3. More than 1 first locking hole 3e2 is penetrated through the ring body 3e1. The second bolt 3c passes through the drill pipe connection part 1 and is locked with the first locking hole 3e2, realizing the firmness between the rod body 3b1 and the drill pipe connection part 1. At the same time, since the locking direction between the rod body 3b1 and the ring body 3e1 is opposite to the locking direction between the ring body 3e1 and the second bolt 3c, better firmness can be obtained when stressed.

[0040] Among them, the dust cover 3f is composed of a first inner groove 3f1, a first through hole 3f2, a cover body 3f3 and a second locking hole 3f4. The first inner groove 3f1 is provided in the middle of the top of the cover body 3f3, and the top of the first inner groove 3f1 passes through the cover body 3f3. The second locking hole 3f4 is also provided on the side of the top of the cover body 3f3. The first through hole 3f2 is penetrated in the middle of the bottom end of the cover body 3f3. The first inner groove 3f1 is communicated with the first through hole 3f2. The diameter of the first inner groove 3f1 is smaller than that of the first through hole 3f2. The rod body 3b1, the convex ring 3b2 and the bearing 3g are all arranged in the first inner groove 3f1. The wire rope connecting part 2 is locked with the second locking hole 3f4 by the first bolt 3a. The rod body 3b1 passes through the first through hole 3f2 and is gap-matched with the first through hole 3f2.

[0041] Among them, the rod body 3b1 is a cylinder, the convex ring 3b2 is a circular ring, and when the rod body 3b1 is located in the first inner groove 3f1, the top height is equal to or lower than the top of the first inner groove 3f1. It is optimal when the top height of the rod body 3b1 is equal to the top of the first inner groove 3f1 when the rod body 3b1 is located in the first inner groove 3f1, so as to reduce the shaking of the rod body 3b1 after being connected to the dust cover 3f and ensure stability when subjected to force.

[0042] The drill rod connecting part 1 is composed of a third thread groove 1a, a drill rod connecting piece 1b, a second inner groove 1c, a first connecting hole 1d and a second through hole 1e. The bottom end of the drill rod connecting piece 1b is provided with a second inner groove 1c, and the second inner groove 1c passes through the bottom of the drill rod connecting piece 1b. The top of the drill rod connecting piece 1b is provided with a first connecting hole 1d and a second through hole 1e. The first connecting hole 1d and the second through hole 1e are both connected to the second inner groove 1c. The second through hole 1e is located in the middle of the drill rod connecting piece 1b. The bottom of the rod body 3b1 passes through the second through hole 1e and is connected to the second thread groove 3b3 through the first thread groove 3b3. The groove 3e3 and the thrust nut 3d are locked, the rod body 3b1 is clearance-matched with the second through hole 1e, more than one first connecting hole 1d is provided, and more than one first connecting hole 1d is evenly arranged around the second through hole 1e, the second bolt 3c passes through the first connecting hole 1d and is locked with the first locking hole 3e2, and the second bolt 3c is clearance-matched with the first connecting hole 1d, and a third thread groove 1a is further provided on the lower side of the drill rod connector 1b, and the third thread groove 1a is used to lock with the drill rod of the drilling rig, so that the drill rod can also be against the bottom of the rod body 3b1 when assembled, further ensuring the stability of the assembly of the rod body 3b1.

[0043] Among them, the third thread groove 1a can be an external thread or an internal thread. When the third thread groove 1a is an external thread, the third thread groove 1a is arranged on the lower side of the side end of the drill rod connecting part 1b. When the third thread groove 1a is an internal thread, the third thread groove 1a is arranged on the lower side of the side end of the second inner groove 1c to adapt to different drilling rig drill rods.

[0044] Among them, the wire rope connecting part 2 is composed of a hanging ear 2a, a hanging hole 2b, a gland 2c and a second connecting hole 2e. One or more of the hanging ears 2a are fixed on the top of the gland 2c. The hanging hole 2b is penetrated through the hanging ear 2a and is used for the assembly of the wire rope. The gland 2c covers the top of the cover body 3f3. The area of the gland 2c is larger than the area of the first inner groove 3f1. The gland 2c is provided with the same number of second connecting holes 2e corresponding to the positions of the second locking holes 3f4.

[0045] Among them, a convex block 2d that is in clearance fit with the first inner groove 3f1 can also be provided at the bottom of the gland 2c. A sealing ring can also be added between the convex block 2d and the first inner groove 3f1 for sealing, which can ensure the sealing performance and can better prevent the lateral offset of the gland 2c, strengthening the stability.

[0046] Embodiment: During the use of the equipment, when it is necessary to disassemble and assemble the connecting piece on the drill pipe, the main shaft 3b of the intermediate connecting piece 3 can be rotated. Since the bottom of the main shaft 3b is locked with the drill pipe connecting part 1 through the second bolt 3c and the fastening ring 3e, when the main shaft 3b rotates, the drill pipe connecting part 1 will also rotate accordingly. Since a dust-proof cover 3f is provided on the upper part of the main shaft 3b and the main shaft 3b is a cylinder, the upper part of the main shaft 3b is rotatable relative to the dust-proof cover 3f. Since the dust-proof cover 3f is locked with the wire rope connecting part 2, the rotation of the dust-proof cover 3f will be interfered by the wire rope connecting part 2. Therefore, the rotation of the main shaft 3b will not drive the rotation of the dust-proof cover 3f, realizing that the drill pipe can be quickly disassembled and assembled without disassembling the wire rope, which is convenient for the back-and-forth hoisting and use of multiple drill pipes. When hoisting and bearing force, the force above the main shaft 3b acts on the bearing 3g, which can reduce the influence of rotation.

[0047] At the same time, when encountering different models or specifications of drill pipes, etc., and it is necessary to adapt different drill pipe connecting parts 1 for use, such as when the connection of the drill pipe changes from internal thread connection to external thread connection, after the equipment rotates the connection between the drill pipe connecting part 1 and the drill pipe through the main shaft 3b, the connection between the drill pipe connecting part 1 and the fastening ring can be achieved by rotating the second bolt 3c. Then, after rotating the thrust nut 3d and then rotating the fastening ring 3e, the main shaft 3b can be separated from the drill pipe connecting part 1. Then, the drill pipe connecting part 1 corresponding to the drill pipe model or specification can be replaced and assembled, avoiding the inconvenience of disassembling the wire rope, replacing the entire connecting piece and then assembling the wire rope, realizing quick and convenient replacement. Relatively speaking, the volume of the carried items can also be reduced during the whole replacement, which is more convenient. The structure of the bottom of the main shaft 3b is locked by the fastening ring 3e and then locked by the thrust nut 3d, and the locking is more stable, which can better prevent loosening. The fastening ring 3e is also locked with the drill pipe connecting part 1 through the second bolt 3c and the locking direction is opposite to the direction in which the fastening ring 3c locks the main shaft 3b, further strengthening the stability of the assembly of the fastening ring 3e and the main shaft 3b with the drill pipe connecting part 1 and better preventing loosening;

[0048] Moreover, since the device adopts a split structure, when components such as the drill pipe connection part 1, wire rope connection part 2, main shaft 3b, thrust nut 3d, fastening ring 3e, dust cover 3f and bearing 3g of the device are damaged, they can be selectively replaced individually, eliminating the need for replacing the whole unit, facilitating quick repair and saving usage costs at the same time.

[0049] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings. It 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 operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0050] The foregoing has shown and described the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic features of the present invention, the present invention can be implemented in other specific forms. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0051] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A drill pipe lifting connector, the structure of which includes a drill pipe connection part (1) and a wire rope connection part (2). The drill pipe connection part (1) is used to connect the drill pipe of the drilling rig, and the wire rope connection part (2) is used to connect with the lifting equipment through the wire rope. Features: It further includes an intermediate connector (3), and the intermediate connector (3) is used to connect the drill pipe connection part (1) and the wire rope connection part (2). The intermediate connector (3) consists of a first bolt (3a), a main shaft (3b), a second bolt (3c), a thrust nut (3d), a fastening ring (3e), a dust cover (3f) and a bearing (3g). The main shaft (3b) is in a Chinese character 'zhong' shape. The dust cover (3f) is sleeved on the upper side of the main shaft (3b). The top of the dust cover (3f) is covered by the wire rope connection part (2) and locked by the first bolt (3a). A bearing (3g) is also sleeved on the part of the upper side of the main shaft (3b) inside the dust cover (3f). The main shaft (3b) can rotate relative to the dust cover (3f). The bottom of the main shaft (3b) penetrates through the bottom of the dust cover (3f) and the top of the drill pipe connection part (1), and then a fastening ring (3e) and a thrust nut (3d) are locked. The thrust nut (3d) is located on the side of the fastening ring (3e) away from the dust cover (3f). The second bolt (3c) is used to lock the fastening ring (3e) and the drill pipe connection part (1).

2. A drill pipe lifting connector according to claim 1, characterized in that: The main shaft (3b) consists of a rod body (3b1), a convex ring (3b2) and a first thread groove (3b3). A circle of convex rings (3b2) is integrally arranged on the upper side of the rod body (3b1). The rod body (3b1) and the convex ring (3b2) form a Chinese character 'zhong' shape. The first thread groove (3b3) is arranged on the lower side of the side end of the rod body (3b1). The rod body (3b1) is locked with the thrust nut (3d) and the fastening ring (3e) through the first thread groove (3b3). The rod body (3b1) and the convex ring (3b2) are arranged inside the dust cover (3f).

3. A drill pipe lifting connector according to claim 2, characterized in that: Bearings (3g) are sleeved on both the upper and lower sides of the rod body (3b1) where the convex ring (3b2) is provided, and the bearings (3g) are arranged inside the dust cover (3f).

4. A drill pipe lifting connector according to claim 2, characterized in that: The fastening ring (3e) consists of a ring body (3e1), a first locking hole (3e2) and a second thread groove (3e3). The inner ring end of the ring body (3e1) is provided with a second thread groove (3e3). The ring body (3e1) is meshed with the first thread groove (3b3) through the second thread groove (3e3). More than 1 first locking hole (3e2) is penetrated through the ring body (3e1). The second bolt (3c) passes through the drill pipe connection part (1) and is locked with the first locking hole (3e2).

5. The drill pipe lifting connector according to claim 2, characterized in that: The dust cover (3f) is composed of a first inner groove (3f1), a first through hole (3f2), a cover body (3f3) and a second lock hole (3f4); the first inner groove (3f1) is provided in the middle of the top end of the cover body (3f3); the top of the first inner groove (3f1) passes through the cover body (3f3); the second lock hole (3f4) is also provided on the side of the top end of the cover body (3f3); the first through hole (3f2) is passed through in the middle of the bottom end of the cover body (3f3); The inner groove (3f1) is communicated with the first through hole (3f2); the diameter of the first inner groove (3f1) is smaller than the diameter of the first through hole (3f2); the rod body (3b1), the convex ring (3b2) and the bearing (3g) are all arranged in the first inner groove (3f1); the wire rope connecting part (2) is locked with the second locking hole (3f4) through the first bolt (3a); the rod body (3b1) passes through the first through hole (3f2) and is loosely matched with the first through hole (3f2).

6. A drill pipe lifting connector according to claim 5, characterized in that: The rod body (3b1) is a cylinder, the convex ring (3b2) is a circular ring, and when the rod body (3b1) is located in the first inner groove (3f1), the top height is equal to or lower than the top of the first inner groove (3f1).

7. A drill pipe lifting connector according to claim 4, characterized in that: The drill rod connecting part (1) is composed of a third thread groove (1a), a drill rod connecting piece (1b), a second inner groove (1c), a first connecting hole (1d) and a second through hole (1e); the second inner groove (1c) is provided at the bottom end of the drill rod connecting piece (1b); the second inner groove (1c) passes through the bottom of the drill rod connecting piece (1b); the first connecting hole (1d) and the second through hole (1e) are passed through the top of the drill rod connecting piece (1b); the first connecting hole (1d) and the second through hole (1e) are both communicated with the second inner groove (1c); the second through hole (1e) is located in the middle of the drill rod connecting piece (1b); the bottom of the rod body (3b1) passes through the second through hole (1e); The rod body (3b1) and the second through hole (1e) are locked through the first thread groove (3b3) and the second thread groove (3e3) and the thrust nut (3d); the rod body (3b1) and the second through hole (1e) are loosely matched; more than one first connecting hole (1d) is provided, and more than one first connecting hole (1d) is evenly arranged around the second through hole (1e); the second bolt (3c) passes through the first connecting hole (1d) and is locked with the first locking hole (3e2); the second bolt (3c) and the first connecting hole (1d) are loosely matched; a third thread groove (1a) is also provided on the lower side of the drill rod connecting piece (1b); the third thread groove (1a) is used to be locked with the drill rod of the drilling rig.

8. The drill pipe lifting connector according to claim 7, characterized in that: The third thread groove (1a) may be an external thread or an internal thread. When the third thread groove (1a) is an external thread, the third thread groove (1a) is arranged at the lower side of the side end of the drill rod connecting piece (1b). When the third thread groove (1a) is an internal thread, the third thread groove (1a) is arranged at the lower side of the side end of the second internal groove (1c).

9. The drill pipe lifting connector according to claim 5, characterized in that: The wire rope connecting part (2) is composed of a hanging ear (2a), a hanging hole (2b), a pressure cover (2c) and a second connecting hole (2e); one or more hanging ears (2a) are fixed on the top of the pressure cover (2c); the hanging ear (2a) is penetrated by a hanging hole (2b); the hanging hole (2b) is used for assembling the wire rope; the pressure cover (2c) is sealed on the top of the cover body (3f3); the area of ​​the pressure cover (2c) is larger than the area of ​​the first inner groove (3f1); and the pressure cover (2c) is provided with an equal number of second connecting holes (2e) at positions corresponding to the second locking holes (3f4).

10. A drill pipe lifting connector according to claim 9, characterized in that: The bottom of the gland (2c) may also be provided with a convex block (2d) that is clearance-matched with the first inner groove (3f1), and a sealing ring may also be provided between the convex block (2d) and the first inner groove (3f1) for sealing.

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