Drilling tool elevator

Abstract

The present invention provides a drilling tool elevator, which comprises an elevator body, two locking devices with the same structure and at least one driving device. The elevator body is provided with a drill rod hole for the drill rod to pass through and two lifting ear groups respectively located on both sides of the drill rod hole, each lifting ear group comprises a first lifting ear and a second lifting ear symmetrically arranged up and down, a lifting ear groove is formed between the first lifting ear and the second lifting ear, and the lifting ear groove is used to cooperate with a lifting ring; the locking device comprises a first hydraulic cylinder and a first hydraulic rod, the driving device is connected to the locking device, the driving device can drive the first hydraulic rod to move in a direction parallel to the axis of the drill rod hole to lock the lifting ring, when the lifting ring is hung in the lifting ear groove, the driving device drives the locking device to operate, the first hydraulic rod extends and can form a closed circle around the lifting ring with the lifting ear groove to lock the lifting ring, thereby avoiding slippage between the lifting ring and the drilling tool elevator during the lifting process and reducing safety hazards.

Description

Technical Field

[0001] The invention relates to the technical field of oil extraction, in particular to a drilling tool elevator. Background Art

[0002] Drilling equipment often includes a drive device, a drill pipe and a drill tool elevator. During operation, the drive device is connected to the drill pipe and can drive the drill pipe to rotate for drilling. The drill pipe is usually inserted into the drill tool elevator, which cooperates with the lifting ring to drive the drill pipe to drill or drill down.

[0003] The drill tool elevator is provided with a lifting ear slot that matches the lifting ring. The staff needs to hang the lifting ring in the lifting ear slot and then thread a protective pin on the lifting ear slot. The protective pin can prevent the lifting ring from slipping out of the lifting ear slot. After the protective pin is threaded, the staff lifts the lifting ring to make the drill tool elevator drive the drill pipe upward, thereby lifting the drill pipe and completing drilling.

[0004] However, the action of inserting the protection pin needs to be done manually by the staff, which is difficult to operate. In addition, manual insertion is prone to not being inserted properly, which can cause the lifting ring to slip off or even cause the drilling tool to fall into the well, so there is a great safety hazard. Summary of the invention

[0005] The embodiment of the present invention provides a drilling tool elevator, which is used to solve the problem of great potential safety hazards in the prior art when a lifting ring is matched with the drilling tool elevator.

[0006] In order to achieve the above-mentioned object, a drilling tool elevator provided in an embodiment of the present invention comprises an elevator body, two locking devices with the same structure and at least one driving device, wherein:

[0007] The elevator body is provided with a drill rod hole for the drill rod to pass through and two lifting lug groups respectively located on both sides of the drill rod hole, each of the lifting lug groups includes a first lifting lug and a second lifting lug symmetrically arranged up and down, a lifting lug groove is formed between the first lifting lug and the second lifting lug, and the lifting lug groove is used to cooperate with the lifting ring;

[0008] The locking device comprises a first hydraulic cylinder and a first hydraulic rod. The driving device is connected to the locking device. The driving device can drive the first hydraulic rod to move in a direction parallel to the axis of the drill rod hole to lock the lifting ring.

[0009] Compared with the prior art, the drill tool elevator provided by the embodiment of the present invention has the following advantages:

[0010] During use of the drilling tool elevator provided by the embodiment of the present invention, after the lifting ring is hung in the lifting ear groove of the elevator body, the driving device drives the locking device to operate, and the first hydraulic rod of the locking device extends out and can form a closed circle around the lifting ring with the lifting ear groove to lock the lifting ring, thereby avoiding slippage between the lifting ring and the drilling tool elevator during the lifting process, reducing the possibility of single lifting ring accidents and reducing safety hazards.

[0011] As described above for the drilling tool elevator, a locking groove is provided on the side of the second lifting ear facing the lifting ear groove, and the first hydraulic rod can extend into the locking groove to lock the lifting ring.

[0012] As described above, the first hydraulic cylinder comprises a first oil chamber, a second oil chamber and a first piston located between the first oil chamber and the second oil chamber, and the first hydraulic rod is located in the second oil chamber and connected to the first piston.

[0013] As described above, the number of the driving devices is two, the two driving devices have the same structure, and are symmetrically arranged about the axis of the drill rod hole.

[0014] As described above, the driving device of the drill tool elevator includes a second hydraulic cylinder and a second hydraulic rod, the oil chamber of the second hydraulic cylinder is connected to the first oil chamber, and the second hydraulic rod can move in a direction parallel to the axis of the drill rod hole so that the hydraulic oil in the second hydraulic cylinder enters the first oil chamber.

[0015] In the drilling tool elevator as described above, one end of the second hydraulic rod extends into the lifting ear groove and contacts the lifting ring.

[0016] As described above, the driving device of the drill tool elevator further includes a third hydraulic cylinder and a third hydraulic rod, the oil chamber of the third hydraulic cylinder is connected to the second oil chamber, and the third hydraulic rod can move in a direction parallel to the axis of the drill rod hole so that the hydraulic oil in the third hydraulic cylinder enters the second oil chamber.

[0017] As described above, the drilling tool elevator has a mounting groove on the elevator body extending upward from the bottom, the third hydraulic cylinder is installed in the mounting groove, and the third hydraulic rod extends out from the mounting groove.

[0018] In the drilling tool elevator as described above, dust plugs are respectively provided on the first hydraulic cylinder, the second hydraulic cylinder and the third hydraulic cylinder.

[0019] In the drilling tool elevator as described above, a connecting pipeline is provided between the third hydraulic cylinder and the second oil chamber, and a manual valve is provided on the connecting pipeline.

[0020] In addition to the technical problems solved by the embodiments of the present invention described above, the technical features that constitute the technical solutions, and the beneficial effects brought about by the technical features of the technical solutions, other technical problems that can be solved by the drill tool elevator provided by the embodiments of the present invention, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments of the present invention or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only part of the embodiments of the present invention. These drawings and text descriptions are not intended to limit the scope of the concept of the present disclosure in any way, but to illustrate the concepts of the present disclosure to those skilled in the art by referring to specific embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 The structure of the drilling tool elevator in the embodiment of the present invention is shown in FIG. Figure 1 ;

[0023] Figure 2 for Figure 1 Schematic diagram of the bottom structure;

[0024] Figure 3 for Figure 1 A top view of

[0025] Figure 4 for Figure 1 A cross-sectional view of

[0026] Figure 5 The structure of the drilling tool elevator in the embodiment of the present invention is shown in FIG. Figure 2 ;

[0027] Figure 6 for Figure 5 sectional view of .

[0028] Description of reference numerals:

[0029] 100- Elevator body; 110- Drill rod hole;

[0030] 121-first lifting lug; 122-second lifting lug;

[0031] 123-lifting ear slot; 124-locking slot;

[0032] 210-first hydraulic cylinder; 211-first oil chamber;

[0033] 212-second oil chamber; 213-first piston;

[0034] 220-first hydraulic rod; 310-second hydraulic cylinder;

[0035] 320 - second hydraulic rod; 410 - third hydraulic cylinder;

[0036] 420-third hydraulic rod; 500-dust plug;

[0037] 600-connecting pipe; 700-lifting ring. DETAILED DESCRIPTION

[0038] In order to solve the problem of great safety hazards in the prior art when the lifting ring and the drill tool elevator are matched, an embodiment of the present invention provides a drill tool elevator, which includes an elevator body, a locking device and a driving device. During use, the lifting ring is hung in the lifting ear groove of the elevator body, and the driving device drives the locking device to operate. The first hydraulic rod of the locking device extends out and can form a closed circle around the lifting ring with the lifting ear groove to lock the lifting ring, thereby avoiding slippage between the lifting ring and the drill tool elevator during the lifting process, reducing the possibility of single lifting ring accidents, and reducing safety hazards.

[0039] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0040] See also Figure 1-Figure 4 The drill tool elevator provided by the embodiment of the present invention comprises an elevator body 100, two locking devices with the same structure and at least one driving device, wherein the elevator body 100 is provided with a drill rod hole 110 for the drill rod to pass through and two lifting ear groups respectively located on both sides of the drill rod hole 110, each lifting ear group comprises a first lifting ear 121 and a second lifting ear 122 symmetrically arranged up and down, a lifting ear groove 123 is formed between the first lifting ear 121 and the second lifting ear 122, and the lifting ear groove 123 is used to cooperate with the lifting ring 700; the locking device comprises a first hydraulic cylinder 210 and a first hydraulic rod 220, and the driving device is connected to the locking device, and the driving device can drive the first hydraulic rod 220 to move in a direction parallel to the axis of the drill rod hole 110 to lock the lifting ring 700.

[0041] Specifically, Figure 1 , Figure 2 and Figure 3As shown, a drill rod hole 110 is provided at the center of the elevator body 100, and the drill rod hole 110 is used to pass the drill rod, so that the drill rod is clamped on the elevator body 100, so that it moves with the movement of the elevator body 100. Two lifting lug groups are provided on both sides of the elevator body 100, and the two lifting lug groups are symmetrically distributed about the axis of the drill rod hole 110. The lifting lug groups are used to connect with the lifting ring 700, so that the elevator body 100 can move with the movement of the lifting ring 700.

[0042] In this embodiment, Figure 1 and Figure 4 As shown, Figure 1 The two lifting ear groups are described in the direction shown in the figure. The structures of the two lifting ear groups are the same. Each lifting ear group includes a first lifting ear 121 and a second lifting ear 122. The first lifting ear 121 and the second lifting ear 122 are respectively fixedly connected to the lifting ear body, and the fixed connection method can be set to welding. Among them, the first lifting ear 121 is located above the second lifting ear 122, and the structure of the first lifting ear 121 is the same as that of the second lifting ear 122. For example, with the plane parallel to the top surface of the elevator body 100 as the cross-section, the cross-sectional shape of the first lifting ear 121 and the second lifting ear 122 can be rectangular, semicircular, or oblong. The first lifting ear 121 and the second lifting ear 122 are arranged opposite to each other, and a lifting ear slot 123 is formed between the first lifting ear 121 and the second lifting ear 122. The cross-sectional shape of the lifting ear slot 123 can be set to be an arc shape with a plane perpendicular to the top surface of the elevator body 100 as a cross section. The opening direction of the lifting ear slot 123 is away from the drill pipe hole 110. The lifting ear slot 123 is used to cooperate with the lifting ring 700. The lifting ring 700 can extend into the lifting ear slot 123 from the opening of the lifting ear slot 123 and be hung in the lifting ear slot 123.

[0043] When the lifting ring 700 is hooked in the lifting ear slot 123, the locking device is used to cooperate with the lifting ear slot 123 to surround the lifting ring 700, forming a closed circle around the lifting ring 700 to prevent the lifting ring 700 from slipping out of the lifting ear slot 123. Specifically, since a lifting ear slot 123 is formed on both sides of the drilling tool elevator, two locking devices are correspondingly provided in this embodiment, and one locking device corresponds to one lifting ear slot 123. The locking device in this embodiment includes a first hydraulic cylinder 210 and a first hydraulic rod 220. The first hydraulic cylinder 210 can be arranged inside the elevator body 100 or installed on the top of the elevator body 100; the first hydraulic rod 220 is located in the first hydraulic cylinder 210 and connected to the piston in the first hydraulic cylinder 210. The first hydraulic rod 220 can extend out of the first hydraulic cylinder 210 under the drive of the hydraulic oil in the first hydraulic cylinder 210.

[0044] In this embodiment, preferably, Figure 4As shown, the first hydraulic cylinder 210 is installed inside the first lifting ear 121. Specifically, the side of the first lifting ear 121 facing the lifting ear slot 123 is the bottom of the first lifting ear 121. The first lifting ear 121 is provided with a receiving slot from the bottom. The first hydraulic cylinder 210 is located in the receiving slot. The first hydraulic rod 220 can move in a direction parallel to the axis of the drill rod hole 110, thereby extending out of the bottom of the first lifting ear 121 and abutting against the top of the second lifting ear 122, thereby intercepting at the opening of the lifting ear slot 123, so that the lifting ring 700 located in the lifting ear slot 123 cannot slip from the opening of the lifting ear slot 123. In addition, a groove or a connecting portion can be provided at the top of the second lifting ear 122, and the groove or the connecting portion is used to cooperate with the first hydraulic rod 220, so as to further improve the locking effect.

[0045] The driving device is connected to the locking device and is used to drive the locking device to cooperate with the lifting lug groove 123. Specifically, based on the above embodiment, the driving device is used to drive the first hydraulic rod 220 to extend out of the bottom of the first lifting lug 121. In this embodiment, the driving device can be a hydraulic driving device, a pneumatic driving device or a motor driving device. The driving device can be installed inside the elevator body 100 or outside the elevator body 100.

[0046] In summary, when the drilling tool elevator provided in this embodiment is in use, after the lifting ring 700 extends into the lifting lug groove 123 and is hooked in the lifting lug groove 123, the driving device drives the locking device to operate, and the first hydraulic rod 220 in the locking device extends out, and can form a closed circle around the lifting ring 700 with the lifting lug groove 123, thereby locking the lifting ring 700. Therefore, the drilling tool elevator provided in this embodiment locks the lifting ring 700 after being hooked with the lifting lug groove 123 by arranging the driving device and the locking device on the drilling tool elevator, thereby avoiding slippage between the lifting ring 700 and the drilling tool elevator during the lifting process, reducing the possibility of accidents caused by a single lifting ring 700, and reducing safety hazards.

[0047] Furthermore, in a possible implementation, a locking groove 124 is provided on one side of the second lifting ear 122 facing the lifting ear groove 123, and the first hydraulic rod 220 can extend into the locking groove 124 to lock the lifting ring 700. Figure 4 and Figure 5As shown, the description is made with the side of the second lifting ear 122 facing the lifting ear slot 123 as the top of the second lifting ear 122. On the basis of the above embodiment, the first hydraulic rod 220 can surround the lifting ring 700 by abutting against the top of the second lifting ear 122. In this embodiment, a locking groove 124 is provided at the top of the second lifting ear 122. The locking groove 124 can be a blind hole or a through hole. The provision of the locking groove 124 in this embodiment enables the first hydraulic rod 220 to extend into the locking groove 124, further improving the reliability of the connection between the first hydraulic rod 220 and the lifting ear slot 123, thereby improving the locking ability of the lifting ring 700.

[0048] In a possible implementation, the first hydraulic cylinder 210 includes a first oil chamber 211, a second oil chamber 212, and a first piston 213 located between the first oil chamber 211 and the second oil chamber 212, and the first hydraulic rod 220 is located in the second oil chamber 212 and connected to the first piston 213. On the basis of the above embodiment, the first hydraulic rod 220 can move in a direction parallel to the axis of the drill rod hole 110 under the drive of the first piston 213 in the first hydraulic cylinder 210. In this embodiment, the first hydraulic cylinder 210 includes a first oil chamber 211, a second oil chamber 212, and a first piston 213. The first hydraulic rod 220 is connected to the first piston 213 and is located in the second oil chamber 212. Specifically, Figure 4 and Figure 6 As shown, Figure 4 The cross-sectional view of the drilling tool elevator when the first hydraulic rod 220 extends into the locking groove 124 is shown; Figure 6 The cross-sectional view of the drilling tool elevator when the first hydraulic rod 220 is retracted into the first hydraulic cylinder 210 is shown. Both the first oil chamber 211 and the second oil chamber 212 are provided with flowing hydraulic oil, and the amount of the hydraulic oil can be changed. When the hydraulic oil in the first oil chamber 211 increases, the hydraulic oil pushes the first piston 213 to move downward, thereby driving the first hydraulic rod 220 to move downward until it extends into the locking groove 124; when the hydraulic oil in the second oil chamber 212 increases, the hydraulic oil pushes the first piston 213 to move upward, thereby driving the first hydraulic rod 220 to move upward and retract into the first hydraulic cylinder 210.

[0049] On the basis of the above-mentioned embodiment, the first hydraulic cylinder 210 is connected to a driving device, and the driving device can drive the amount of hydraulic oil in the first oil chamber 211 and the second oil chamber 212 to change. Since there are two locking devices in this embodiment, the driving device can be one or two. In a possible implementation, there are two driving devices, the two driving devices have the same structure, and are symmetrically arranged about the axis of the drill rod hole 110, and each driving device is connected to one first hydraulic cylinder 210. In addition, when the driving device is set to one, the driving device is connected to two first hydraulic cylinders 210 respectively.

[0050] In a possible implementation, the driving device includes a second hydraulic cylinder 310 and a second hydraulic rod 320, the oil chamber of the second hydraulic cylinder 310 is connected to the first oil chamber 211, and the second hydraulic rod 320 can move in a direction parallel to the axis of the drill rod hole 110 so that the hydraulic oil in the second hydraulic cylinder 310 enters the first oil chamber 211. Specifically, Figure 4 and Figure 6 As shown, the second hydraulic cylinder 310 includes an oil chamber and a piston, and the second hydraulic rod 320 is connected to the bottom of the piston. In this embodiment, a connecting pipe 600 is provided between the oil chamber of the second hydraulic cylinder 310 and the first oil chamber 211, so that the hydraulic oil in the second hydraulic cylinder 310 and the hydraulic oil in the first oil chamber 211 can flow. Therefore, when an upward force is applied to the second hydraulic rod 320, the second hydraulic rod 320 moves upward, and the piston also moves upward, thereby squeezing the hydraulic oil in the oil chamber of the second hydraulic cylinder 310, so that it enters the first oil chamber 211 of the first hydraulic cylinder 210 through the connecting pipe 600, thereby pushing the first piston 213 and the first hydraulic rod 220 to move downward.

[0051] On the basis of the above embodiment, the upward force applied to the second hydraulic rod 320 can be driven manually or mechanically. Preferably, in a possible implementation, one end of the second hydraulic rod 320 extends into the lifting ear groove 123 and contacts the lifting ring 700, and the lifting ring 700 can apply an upward force to the second hydraulic rod 320. Figure 4 As shown, when the lifting ring 700 is hooked in the lifting lug slot 123, the lifting ring 700 drives the drilling tool elevator to lift upward as a whole, so the lifting ring 700 acts on the end of the second hydraulic rod 320, so that the second hydraulic rod 320 and the piston in the second hydraulic cylinder 310 move upward, and the hydraulic oil in the oil chamber of the second hydraulic cylinder 310 is squeezed into the first oil chamber 211 of the first hydraulic cylinder 210. Such a setting reduces the cumbersomeness of manual operation, and utilizes the action of the lifting ring 700 to drive the second hydraulic rod 320 and then drive the locking device, so as to realize automatic locking and improve the speed and convenience of locking the lifting ring 700.

[0052] Furthermore, in a possible implementation, the driving device further includes a third hydraulic cylinder 410 and a third hydraulic rod 420, the oil chamber of the third hydraulic cylinder 410 is connected to the second oil chamber 212, and the third hydraulic rod 420 can move in a direction parallel to the axis of the drill rod hole 110 so that the hydraulic oil in the third hydraulic cylinder 410 enters the second oil chamber 212. Figure 4 and Figure 6As shown, the third hydraulic cylinder 410 includes an oil chamber and a piston, and the third hydraulic rod 420 is connected to the bottom of the piston. In this embodiment, a connecting pipe 600 is provided between the oil chamber of the third hydraulic cylinder 410 and the second oil chamber 212. It should be noted that the connecting pipe 600 is connected to the side bottom of the second oil chamber 212. The hydraulic oil in the third hydraulic cylinder 410 and the hydraulic oil in the second oil chamber 212 can flow. Therefore, when an upward force is applied to the third hydraulic rod 420, the third hydraulic rod 420 moves upward, and the piston also moves upward, thereby squeezing the hydraulic oil in the oil chamber of the third hydraulic cylinder 410, so that it enters the second oil chamber 212 of the first hydraulic cylinder 210 through the connecting pipe 600, thereby pushing the first piston 213 and the first hydraulic rod 220 to move upward.

[0053] On the basis of the above-mentioned embodiment, the upward force applied to the third hydraulic rod 420 can be driven manually or mechanically. Preferably, in a possible implementation, a mounting groove is provided on the elevator body 100 from the bottom to the top, the third hydraulic cylinder 410 is installed in the mounting groove, and the third hydraulic rod 420 extends from the mounting groove. When the drilling tool elevator is finished working, the drilling tool elevator is lowered to the bottom of the elevator body 100 with the lifting ring 700 and contacts the mounting surface of the drilling platform. The mounting surface is a plane and can apply an upward force to the third hydraulic rod 420. Figure 6 As shown, when the bottom of the elevator body 100 contacts the mounting surface, the mounting surface acts on the end of the third hydraulic rod 420, so that the third hydraulic rod 420 and the piston in the third hydraulic cylinder 410 move upward, and the hydraulic oil in the oil chamber of the third hydraulic cylinder 410 is squeezed into the second oil chamber 212 of the first hydraulic cylinder 210. Such a setting reduces the cumbersomeness of manual operation, and utilizes the mutual force between the elevator body 100 and the mounting surface to drive the third hydraulic rod 420 and then drive the locking device, so as to realize automatic unlocking, improve convenience, and facilitate the removal of the lifting ring 700.

[0054] In a possible implementation, dust plugs 500 are respectively provided on the first hydraulic cylinder 210, the second hydraulic cylinder 310 and the third hydraulic cylinder 410. Specifically, Figure 4 and Figure 6 As shown, dust plugs 500 are respectively provided at the bottom of the first hydraulic cylinder 210, the second hydraulic cylinder 310 and the third hydraulic cylinder 410. The dust plugs 500 can be rubber retaining rings, rubber plugs or plastic retaining rings. This embodiment does not specifically limit the shape and material of the dust plugs 500, which can be selected according to actual conditions.

[0055] In a possible implementation, a connecting pipeline 600 is provided between the third hydraulic cylinder 410 and the second oil chamber 212, and a manual valve is provided on the connecting pipeline 600. In this embodiment, the manual valve may be a stop valve, a plug valve, a ball valve or a butterfly valve. Specifically, the manual valve is used to close the connecting pipeline 600. When the manual valve is locked, the hydraulic oil between the third hydraulic cylinder 410 and the first oil chamber 211 can be prevented from flowing. The hand wheel and handle of the manual valve can be extended and arranged at the top of the elevator body 100. In addition, the manual valve can also be arranged between the second hydraulic cylinder 310 and the first oil chamber 211. The setting of the manual valve can ensure the stability of the hydraulic oil in each hydraulic cylinder inside the drilling tool elevator when it is not working.

[0056] The various embodiments or implementation methods in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.

[0057] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A drilling tool elevator, characterized in that: It includes an elevator body, two locking devices with the same structure and at least one driving device, wherein: The elevator body is provided with a drill rod hole for the drill rod to pass through and two lifting lug groups respectively located on both sides of the drill rod hole, each of the lifting lug groups includes a first lifting lug and a second lifting lug symmetrically arranged up and down, a lifting lug groove is formed between the first lifting lug and the second lifting lug, and the lifting lug groove is used to cooperate with the lifting ring; The locking device comprises a first hydraulic cylinder and a first hydraulic rod, the driving device is connected to the locking device, and the driving device can drive the first hydraulic rod to move in a direction parallel to the axis of the drill rod hole to lock the lifting ring; The first hydraulic cylinder comprises a first oil chamber, a second oil chamber and a first piston located between the first oil chamber and the second oil chamber, and the first hydraulic rod is located in the second oil chamber and connected to the first piston; The number of the driving devices is two, the two driving devices have the same structure, and are symmetrically arranged about the axis of the drill rod hole; The driving device comprises a second hydraulic cylinder and a second hydraulic rod, the oil chamber of the second hydraulic cylinder is connected to the first oil chamber, and the second hydraulic rod can move in a direction parallel to the axis of the drill rod hole so that the hydraulic oil in the second hydraulic cylinder enters the first oil chamber; One end of the second hydraulic rod extends into the lifting ear groove and contacts the lifting ring; The driving device also includes a third hydraulic cylinder and a third hydraulic rod, the oil chamber of the third hydraulic cylinder is connected to the second oil chamber, and the third hydraulic rod can move in a direction parallel to the axis of the drill rod hole so that the hydraulic oil in the third hydraulic cylinder enters the second oil chamber.

2. The drilling tool elevator according to claim 1, characterized in that: A locking groove is provided on one side of the second lifting ear facing the lifting ear groove, and the first hydraulic rod can extend into the locking groove to lock the lifting ring.

3. The drilling tool elevator according to claim 1, characterized in that: The elevator body is provided with a mounting groove extending upward from the bottom, the third hydraulic cylinder is mounted in the mounting groove, and the third hydraulic rod extends out from the mounting groove.

4. The drilling tool elevator according to claim 3, characterized in that: The first hydraulic cylinder, the second hydraulic cylinder and the third hydraulic cylinder are respectively provided with dust plugs.

5. The drilling tool elevator according to claim 4, characterized in that: A communication pipeline is provided between the third hydraulic cylinder and the second oil chamber, and a manual valve is provided on the communication pipeline.

Images