Throwing type cable cutting device and method in polar region ice well

Abstract

The invention discloses a throwing type cable cutting device and method in a polar region ice well, and belongs to the technical field of cable cutting in the well, the cable cutting device comprises an upper clamping module, a protective cylinder, a cutting module and a lower clamping module, all the modules are sequentially arranged in the axial direction of an armored cable, and structural connection and positioning are achieved through the protective cylinder. According to the method, the throwing type cable cutting device in the polar region ice well is used for cable cutting. According to the device, the armored cable is thrown into the well along the ground surface to reach the position above the drill clamping tool in the well, then the armored cable is cut off above the drill clamping tool, the armored cable in the well can be recycled, no extra cable or rope is needed for laying, application and recycling of the device can be achieved through the existing armored cable in the well, and the device is convenient to use. The structure is simple; meanwhile, the risk that two cables are wound and knotted in a well can be effectively avoided without using extra cables, and the accident rate in a hole is low.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of cable cutting in well, and particularly relates to a polar ice well in-pit throwing type cable cutting device and method. BACKGROUND

[0002] In the deep drilling operation of the polar ice layer and the underlying bedrock, the technical scheme of suspending the downhole power drill by the armored cable is widely used for core drilling. Although this method has certain operation flexibility and high drilling efficiency, in the actual construction process, the drill is faced with a series of sticking risks in the ice hole. For example, the ice chip discharge is not smooth, the hole wall melt water is refrozen, the ice layer creepage leads to the hole shrinkage, and the like, which can cause the serious failure that the cable and the drill are stuck in the hole.

[0003] Once the sticking accident occurs and cannot be effectively released, the emergency treatment method of cutting the armored cable on the ground is usually adopted. This means that the whole drill and the connected cable will be permanently left in the hole, and significant economic losses and technical obstacles will be caused. Since the armored cable itself is expensive, the length of the abandoned cable in the thousands of meters deep hole can reach thousands of meters, and the direct cost loss is extremely huge.

[0004] In addition, the cable segment after cutting often accumulates at the position of several hundred meters above the hole bottom, forms a physical obstacle, makes the drill hole difficult to enter or continue to use again, seriously restricts the subsequent scientific research or engineering operation of the same drill hole, and reduces the utilization value and engineering benefit of the drill hole. Therefore, it is urgent to develop a new drilling technology and device which can realize the safe recovery of the cable after the sticking occurs. SUMMARY

[0005] The present application aims at solving the problem that the armored cable in the well cannot be recovered after the sticking accident occurs in the polar ice well, and proposes a polar ice well in-pit throwing type cable cutting device and method, which is lowered into the well by the surface throwing method, and cuts the armored cable in the well above the sticking drill, so that the armored cable in the well is released and recovered.

[0006] The technical scheme adopted by the present application to achieve the above-mentioned purpose is:

[0007] According to the first aspect of the present application, a polar ice well in-pit throwing type cable cutting device is provided, which comprises an upper clamping module, a casing, a cutting module and a lower clamping module.

[0008] The upper clamping module comprises an upper clamping seat, an upper clamping block, a moving disc and a first spring, the upper clamping seat is coaxially fixedly connected with the casing, the moving disc and the first spring are arranged in the casing and can slide along the inner wall of the casing; the upper part of the central hole of the upper clamping seat is a cylindrical hole, the lower part is a conical hole, a plurality of T-shaped grooves are arranged on the hole wall of the conical hole, and the number of the T-shaped grooves on the upper clamping seat is consistent with the number of the upper clamping blocks, and each upper clamping block is slidingly arranged in the corresponding T-shaped groove.

[0009] The cutting module comprises a cutter holder fixing disc, a pin shaft, a cutter and a cutter holder body; the cutter holder fixing disc is coaxially fixedly connected with the casing, the cutter holder body is fixed in the rectangular groove at the center of the cutter holder fixing disc, the center of the cutter holder body is provided with a rectangular hole for the armored cable to pass through, one side of the rectangular hole is provided with a rotatable cutter through the pin shaft, and the other side of the inner wall is provided with a V-shaped groove.

[0010] The lower clamping module comprises a rack fixing disc, a rack, a lower clamping block, a lower clamping seat, a pad, a second spring, a clamping adjusting rod, a connecting rod and a transverse adjusting rod; the rack fixing disc is slidingly arranged in the casing and is limited in position in cooperation with the cutter holder fixing disc; the upper end of the rack and the connecting rod is fixed to the rack fixing disc, the rack and the connecting rod pass through the lower end of the cutter holder fixing disc and are connected with the lower clamping seat; the upper part of the central hole of the lower clamping seat is a conical hole, a plurality of T-shaped grooves are arranged on the hole wall of the conical hole, and the number of the T-shaped grooves on the lower clamping seat is consistent with the number of the lower clamping blocks, and each lower clamping block is slidingly arranged in the corresponding T-shaped groove; the pad is coaxially slidingly connected with the lower clamping seat and is connected with the clamping adjusting rod arranged in the connecting rod through the transverse adjusting rod; the upper part of the clamping adjusting rod is provided with a second spring, and the second spring is used to provide a downward thrust to the clamping adjusting rod.

[0011] Further, the upper part of the rack is a rectangular section, and the middle part is a helical tooth structure; the cutter is always close to the surface of the rack under the action of the torsional spring.

[0012] Further, when the rack moves upward, the cutter contacts the rectangular section or the helical tooth slope of the rack, so that the cutter moves away from the armored cable; when the rack moves downward, the cutter contacts the bottom plane of the helical tooth, and pushes the cutter to cut into the armored cable.

[0013] Further, the moving disc and the first spring are arranged between the rack fixing disc and the upper clamping seat; when the rack fixing disc is located at the lower limit position, a gap is left between the moving disc and the upper clamping seat, and the upper clamping blocks fall under the action of gravity, so that the accommodation space defined and surrounded by all the upper clamping blocks is larger than the diameter of the armored cable.

[0014] Further, the upper end of the clamping adjusting rod is provided with an elbow, and the rack fixing disc is provided with a rectangular groove for the elbow to move up and down.

[0015] Further, the protecting cylinder is a cylindrical structure, used for accommodating and guiding the relative movement of the upper clamping module, the cutting module and the lower clamping module.

[0016] Further, the upper clamping seat and the protecting cylinder and the cutter holder fixing disc and the protecting cylinder are connected through threads.

[0017] Further, after the armored cable is cut, the upper clamping block is self-locked under the cooperation of the upper clamping seat conical surface and the armored cable, and the armored cable is recovered to the ground.

[0018] Further, the cable cutting device is suitable for armored cables with different diameters by replacing cutter holder bodies and cutters with different specifications.

[0019] According to the second aspect of the present application, a method for cutting a cable by using the polar ice well inner throwing type cable cutting device is provided, comprising the following steps:

[0020] The armored cable is sequentially threaded through the center hole of the lower clamping seat, the cushion block, the cutter holder body, the rack fixing disc, the first spring, the moving disc and the upper clamping seat;

[0021] The cable cutting device is hung above the borehole orifice, and the lower clamping module falls under the action of gravity, so that the rack fixing disc is in contact with the cutter holder fixing disc, and at this time, the upper clamping module and the lower clamping module do not clamp the armored cable;

[0022] The cable cutting device is released, and is slid downward along the armored cable to a stuck drill position;

[0023] The lower clamping seat is in contact with the stuck drill tool and stops moving, and the upper clamping module and the cutting module continue to move downward under the action of inertia, so that the upper clamping module and the lower clamping module clamp the armored cable;

[0024] The armored cable on the ground is lifted upward, so that the cutting module moves upward relative to the rack, and the cutter is cut into and cut off the armored cable under the pushing of the rack;

[0025] After being cut off, the armored cable is continuously lifted upward, so that the cable cutting device is recovered to the ground.

[0026] Through the above design scheme, the present application can bring the following beneficial effects:

[0027] 1. The present application reaches above the stuck drill tool along the armored cable in the mode of being thrown from the ground to the well, and then cuts off the armored cable above the drill tool, so that the armored cable in the well can be recovered, and the cost is greatly saved.

[0028] 2. The polar ice well in-pitching type cable cutting device provided by the present application does not need additional cables or ropes for laying, and can realize the application and recovery of the cable cutting device through the existing armored cable in the well, and has simple structure; meanwhile, the use of additional cables can effectively avoid the risk of entanglement and knotting of two cables in the well, and the accident rate in the hole is low.

[0029] 3. The polar ice well in-pitching type cable cutting device provided by the present application can be recycled to the ground together with the armored cable after cutting, and can be reused, and after replacing different cutter bodies and cutters, it can be applied to armored cables of different diameters, has low cost, and has wide applicability. BRIEF DESCRIPTION OF DRAWINGS

[0030] The drawings described herein are used to provide further understanding of the present application, constitute a part of the present application, and the schematic embodiments of the present application and the description thereof are used to understand the present application, and do not constitute improper limitation of the present application, and in the drawings:

[0031] Figure 1 The polar ice well in-pitching type cable cutting device provided by the present application is provided with a whole view;

[0032] Figure 2 The polar ice well in-pitching type cable cutting device provided by the present application is provided with a sectional view;

[0033] Figure 3 The polar ice well in-pitching type cable cutting device provided by the present application is provided with a partial view;

[0034] Figure 4 The polar ice well in-pitching type cable cutting device provided by the present application is provided with a partial enlarged view of a cutter part;

[0035] Figure 5 The polar ice well in-pitching type cable cutting device provided by the present application is provided with a working principle schematic view.

[0036] In the drawings, various reference signs are as follows: 1, upper clamping module; 2, casing; 3, cutting module; 4, lower clamping module; 5, armored cable; 6, drill pipe; 11, upper clamping seat; 12, upper clamping block; 13, moving disc; 14, first spring; 31, cutter holder fixed disc; 32, pin shaft; 33, torsional spring; 34, cutter; 35, cutter body; 41, rack fixed disc; 42, rack; 43, lower clamping block; 44, lower clamping seat; 45, pad; 46, second spring; 47, clamping adjusting rod; 48, connecting rod; 49, transverse adjusting rod. DETAILED DESCRIPTION

[0037] For a clearer explanation of the present application, the present application will be further described below in conjunction with the preferred embodiments and the accompanying drawings. It should be understood by those skilled in the art that the specific description below is illustrative rather than limiting and is not intended to limit the scope of the present application. Unless otherwise defined, the technical terms or scientific terms used herein should be understood by those skilled in the art as having their usual meanings. In order to avoid obscuring the essence of the present application, well-known methods, processes, procedures, elements and circuits are not described in detail.

[0038] As shown in the embodiment, the polar ice well inner throwing type cable cutting device comprises an upper clamping module 1, a casing 2, a cutting module 3 and a lower clamping module 4. The upper clamping module 1, the cutting module 3 and the lower clamping module 4 are arranged in sequence along the armored cable 5 in the axial direction and are connected and positioned by the casing 2. Figures 1 to 4 The upper clamping module 1 comprises an upper clamping seat 11, an upper clamping block 12, a moving disc 13 and a first spring 14. The upper clamping seat 11 is connected with the upper end of the casing 2 by screw thread. The upper clamping seat 11 has a cylindrical hole in the upper part and a conical hole in the lower part. Three T-shaped grooves are formed on the hole wall of the conical hole. The upper clamping block 12 is located in the conical hole of the upper clamping seat 11. The upper clamping block 12 is in contact with the upper surface of the moving disc 13. The number of the upper clamping block 12 is three. The three upper clamping blocks 12 are respectively embedded in the three T-shaped grooves of the upper clamping seat 11 through the T-shaped tenon at the back of the upper clamping block 12, so that each upper clamping block 12 can slide up and down along the generatrix direction of the conical surface in the corresponding T-shaped groove. The moving disc 13 has a disc structure. The moving disc 13 is arranged between the upper clamping seat 11 and the first spring 14 and can slide up and down along the inner wall of the casing 2. The first spring 14 is sleeved inside the casing 2 and located between the moving disc 13 and the rack fixing disc 41. The first spring 14 and the moving disc 13 cooperate to achieve the upper limiting action of the rack fixing disc 41.

[0039] The casing 2 has a cylindrical structure and serves as the main support of the cable cutting device. The upper end of the casing 2 is coaxially connected with the upper clamping seat 11 by screw thread, and the lower end is coaxially connected with the cutter holder fixing disc 31 by screw thread.

[0040] The casing 2 has a cylindrical structure and serves as the main support of the cable cutting device. The upper end of the casing 2 is coaxially connected with the upper clamping seat 11 by screw thread, and the lower end is coaxially connected with the cutter holder fixing disc 31 by screw thread.

[0041] The cutting module 3 comprises a cutter fixing disc 31, a pin shaft 32, a torsion spring 33, a cutter 34 and a cutter body 35; the cutter fixing disc 31 is coaxially and threadedly connected with the casing 2, a rectangular groove is formed in the center of the cutter fixing disc 31, the cutter fixing disc 31 is used for mounting and fixing the cutter body 35, and simultaneously plays a lower limiting role for the rack fixing disc 41; the cutter body 35 is fixed in the center of the rectangular groove of the cutter fixing disc 31 by means of screws, the center of the cutter body 35 is a rectangular hole for the armored cable 5 to pass through, the cutter 34, the pin shaft 32 and the torsion spring 33 are mounted on one side of the rectangular hole, a V-shaped groove is formed in the inner wall of the other side of the rectangular hole and opposite to the cutter 34, so as to avoid interference between the cutter 34 and the cutter body 35 during rotation; the pin shaft 32 is fixed to the cutter body 35, the torsion spring 33 is sleeved on the pin shaft 32, one end of the torsion spring 33 is fixed to the cutter body 35, and the other end of the torsion spring 33 acts on the cutter 34; the cutter 34 is a blade capable of rotating around the pin shaft 32, the cutter 34 is mounted on the cutter body 35 through the pin shaft 32, and the torsion spring 33 always has a rotating tendency of the cutter 34 towards the armored cable 5.

[0042] The lower clamping module 4 comprises a rack fixing disc 41, a rack 42, a lower clamping block 43, a lower clamping seat 44, a pad 45, a second spring 46, a clamping adjusting rod 47, a connecting rod 48 and a transverse adjusting rod 49; the rack fixing disc 41 is disc-shaped, has a rectangular slot in the center for the clamping adjusting rod 47 to pass through, is located above the tool holder fixing disc 31 and can slide coaxially along the casing 2; the rack 42 and the connecting rod 48 are arranged in parallel to each other and both are rectangular in cross section, the width of which matches the rectangular slot of the tool holder fixing disc 31, the rack 42 and the connecting rod 48 can slide up and down along the rectangular slot of the tool holder fixing disc 31, one end of the rack 42 and the connecting rod 48 passes through the rectangular slot of the tool holder fixing disc 31 and is fixed below the rack fixing disc 41 by a bolt, and the other end is fixedly connected with the lower clamping seat 44 by a bolt; the lower clamping seat 44 has a cylindrical hole in the lower part of the center hole and a conical hole in the upper part, and three T-shaped grooves are formed in the hole wall of the conical hole; the number of the lower clamping blocks 43 is three, the three lower clamping blocks 43 are respectively embedded in the three T-shaped grooves of the lower clamping seat 44 through the T-shaped tenon at the back of each lower clamping block 43, so that each lower clamping block 43 can slide up and down along the generatrix direction of the conical surface in the corresponding T-shaped groove; the pad 45 is disc-shaped, is coaxially arranged with the lower clamping seat 44 and can slide up and down along the lower cylindrical hole of the lower clamping seat 44, the upper surface of the pad 45 is in contact with the lower clamping block 43 and the pad 45 moves up and down to push the lower clamping block 43 to move up and down synchronously; the clamping adjusting rod 47 is installed in the inner hole of the connecting rod 48 and can slide coaxially along the hole, the lower side of the clamping adjusting rod 47 is fixedly connected with the pad 45 through the transverse connecting rod 49, the upper side is provided with the second spring 46 in the compressed state, one side of the second spring 46 is in contact with the rack fixing disc 41 and the other side continuously provides a downward pushing force to the clamping adjusting rod 47.

[0043] A bend is formed at the upper end of the clamping adjusting rod 47 and a rectangular slot is formed in the rack fixing seat 41 for the bend of the clamping adjusting rod 47 to move up and down freely.

[0044] The upper part of the rack 42 is rectangular and the middle part is a helical tooth structure; the cutter 34 is always close to the surface of one side of the rack 42 under the action of the torsional spring 33.

[0045] When the rack 42 moves upward, the cutter 34 first contacts the upper rectangular surface of the rack 42, at this time, the cutter 34 will move away from the armored cable 5, the gap between the cutter 34 and the cutter holder 35 is greater than the diameter of the armored cable 5; when the rack 42 continues to move upward to the position where the inclined tooth structure reaches the cutter 34, the cutter 34 will contact the inclined surface of the inclined tooth, at this time, the cutter 34 is still rotated away from the armored cable 5 due to the pushing action of the inclined surface, at this time, the rack 42 still continues to move upward; when the rack 42 reaches the upper limit and starts to move downward, at this time, the cutter 34 will contact the bottom plane of the inclined tooth, when the rack 42 continues to move downward, it will push the cutter 34 to rotate towards the armored cable 5, and then make the cutter 34 cut into the armored cable 5.

[0046] The movable disc 13 and the first spring 14 are both installed between the rack fixing disc 41 and the upper clamping seat 11, when the rack fixing disc 41 is at the lower limit, the free length of the first spring 14 is not enough to make the movable disc 13 and the upper clamping seat 11 contact, there will be a gap between the movable disc 13 and the upper clamping seat 11, at this time, the upper clamping block 12 will fall under the action of gravity and contact the upper surface of the movable disc 13, and then make the accommodation space defined and surrounded by the three upper clamping blocks 12 greater than the diameter of the armored cable 5.

[0047] Specific working principle:

[0048] Figure 5 The working principle of the throwing type cable cutting device in the polar ice well is shown. A is the throwing and falling stage, B is the position where the drill is stuck, C is the cutting stage of lifting up, and D is the recovery stage.

[0049] When the armored cable drilling tool is stuck in the polar ice hole, first, the end of the armored cable 5 on the ground is successively threaded through the center holes of the lower clamping seat 44, the pad 45, the cutter holder 35, the rack fixing disc 41, the first spring 14, the movable disc 13 and the upper clamping seat 11, the armored cable 5 is pulled tight on the ground, and the upper clamping seat 11 is suspended directly above the drilling hole, the lower clamping module 4 falls under the action of gravity, the rack fixing disc 41 contacts the cutter fixing disc 31, and the clamping connecting rod 47 is forced to retract into the rectangular groove of the rack fixing disc 41, at this time, the clamping adjusting rod 47 moves upward relative to the connecting rod 48, and the pad 45 is driven to move upward through the transverse adjusting rod 49, and then the lower clamping block 43 is kept at a high position, at this time, the accommodation space defined and surrounded by all the lower clamping blocks 43 will be greater than the diameter of the armored cable 5. At the same time, since the rack fixing disc 41 is at the lower limit, the accommodation space defined and surrounded by all the upper clamping blocks 12 is also greater than the diameter of the armored cable 5. At the same time, since the upper rectangular surface of the rack 42 contacts the cutter 34 at this time, the gap between the cutter 34 and the cutter holder 35 is greater than the diameter of the armored cable 5.

[0050] Therefore, when the throwing type cable cutting device is suspended above the borehole, the diameters of the upper clamping block 1, the cutting module 3 and the inner hole of the lower clamping module 4 are all greater than the diameter of the armored cable 5, as shown in Figure 5 A, at this time, the cable cutting device is released, and the cable cutting device will slide along the armored cable 5 into the well.

[0051] When the cable cutting device reaches the stuck position, the lower clamping seat 44 will be in contact with the stuck drilling tool 6 and stop moving, and the rack 42, the connecting rod 48 and the rack fixing seat 41 rigidly connected with the lower clamping seat 44 will also stop moving synchronously, while the upper clamping module 1 and the cutting module 3 will continue to move downward under the action of inertia, thereby compressing the first spring 14 and pushing the moving disc 13 and the upper clamping block 12 to move upward relative to the upper clamping seat 11, the spacing between the three upper clamping blocks 12 is reduced and the armored cable 5 is clamped. At the same time, since the rack fixing seat 41 and the cutter holder fixing seat 31 are out of contact, the clamping adjusting rod 47 moves downward relative to the connecting rod 48 under the action of the second spring 46, and drives the pad 45 and the lower clamping block 43 to move downward relative to the lower clamping seat 44, so that the spacing between the three lower clamping blocks 43 is reduced and the armored cable 5 is clamped.

[0052] After the upper clamping module 1 completes clamping, under the action of falling inertia, the upper clamping module 1 will drive the armored cable 5 to continue to move downward, and since the armored cable 5 near the lower clamping module 4 cannot move downward, the armored cable 5 will bend in the free space between the cutting module 3 and the lower clamping module 4 until the first spring 14 reaches the maximum compression amount, the upper clamping module 1 and the cutting module 3 stop moving downward, as shown in Figure 5 B. During this process, the cutter 34 also moves downward relative to the rack 42 and is in contact with the inclined tooth structure of the rack 42, and due to the pushing action of the inclined surface of the inclined tooth of the rack 42, the cutter 34 still rotates away from the armored cable 5, so it will not produce resistance to the falling of the upper clamping module 1 and the cutting module 3.

[0053] When the upper clamping module 1 stops falling, at this time, the armored cable 5 is pulled upward from the ground, and since the upper clamping module 1 is in a clamped state at this time, the armored cable 5 drives the upper clamping module 1 and the cutting module 3 to move upward, while the armored cable 5 connected to the lower stuck drilling tool 6 is fixed, so the lower clamping module 5 cannot move. During this process, the armored cable 5 bent between the cutting module 3 and the lower clamping seat 44 will be gradually straightened until the cutter 34 of the cutting module 3 moves to contact the bottom surface of the inclined tooth of the rack 42, the cutter 34 rotates to the armored cable 5 under the pushing action of the rack 42, and then the cutter 34 cuts into the armored cable 5 until the armored cable 5 is cut off, as shown in Figure 5 C.

[0054] After the armored cable 5 is cut off, the upper clamping block 12 will be self-locked under the joint action of the conical surface of the upper clamping seat 11 and the armored cable 5, and then continue to be in the clamping state, so that the armored cable 5 on the ground will continue to drive the upper clamping module 1 upward until the rack fixing disc 41 and the tool holder fixing disc 31 are in contact again, forcing the clamping connecting rod 47 to retract into the rectangular groove of the rack fixing disc 41, and then driving the pad 45 and the lower clamping block 43 to move upward, so that the lower clamping block 43 is separated from the contact with the armored cable 5. Continue to lift the armored cable 5 on the ground, and the cable cutting device will be recycled to the ground together with the armored cable 5, as shown in Figure 5 D.

[0055] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A drop-type cable cutting device for use in polar ice wells, characterized in that, include: Upper clamping module (1), protective sleeve (2), cutting module (3) and lower clamping module (4); The upper clamping module (1) includes an upper clamping seat (11), an upper clamping block (12), a moving plate (13), and a first spring (14). The upper clamping seat (11) is coaxially and fixedly connected to the protective cylinder (2). The moving plate (13) and the first spring (14) are located inside the protective cylinder (2) and can slide along the inner wall. The upper part of the center hole of the upper clamping seat (11) is a cylindrical hole, and the lower part is a conical hole. The conical hole has multiple T-shaped grooves on its wall. The upper clamping block (12) is slidably located in the T-shaped groove of the upper clamping seat (11). The cutting module (3) includes a tool holder fixing plate (31), a pin (32), a cutter (33), and a tool holder body (35); the tool holder fixing plate (31) is coaxially fixedly connected to the protective sleeve (2), and the tool holder body (35) is fixed in the rectangular groove in the center of the tool holder fixing plate (31). The center of the tool holder body (35) is provided with a rectangular hole for the armored cable (5) to pass through. The cutter (34) is rotatably installed on one side of the rectangular hole through the pin (32), and a V-shaped groove is provided on the inner wall of the other side. The lower clamping module (4) includes a rack fixing plate (41), a rack (42), a lower clamping block (43), a lower clamping seat (44), a pad (45), a second spring (46), a clamping adjustment rod (47), a connecting rod (48), and a transverse adjustment rod (49); the rack fixing plate (41) is slidably disposed inside the protective sleeve (2) and cooperates with the tool holder fixing plate (31) for limiting; the upper ends of the rack (42) and the connecting rod (48) are fixed to the rack fixing plate (41), and the rack (42) and the connecting rod (48) are... After passing through the lower end of the tool holder fixing plate (31), it is connected to the lower clamping seat (44); the upper part of the central hole of the lower clamping seat (44) is a conical hole, and multiple T-shaped grooves are provided on its hole wall. The lower clamping block (43) is slidably disposed in the T-shaped groove of the lower clamping seat (44); the pad (45) is slidably connected to the lower clamping seat (44) on the same axis, and is connected to the clamping adjustment rod (47) provided in the connecting rod (48) through the transverse adjustment rod (49); a second spring (46) is provided above the clamping adjustment rod (47).

2. The polar ice well-throwing cable cutting device according to claim 1, characterized in that, The upper part of the rack (42) has a rectangular cross section and the middle part has a helical tooth structure; the cutter (34) is always in close contact with the surface of the rack (42) under the action of the torsion spring (33).

3. The polar ice well-throwing cable cutting device according to claim 2, characterized in that, When the rack (42) moves upward, the cutter (34) contacts the rectangular cross section or the inclined surface of the rack (42), causing the cutter (34) to move away from the armored cable (5); when the rack (42) moves downward, the cutter (34) contacts the bottom plane of the inclined tooth, pushing the cutter (34) to cut into the armored cable (5).

4. The polar ice well-throwing cable cutting device according to claim 1, characterized in that, The movable disk (13) and the first spring (14) are located between the rack fixing disk (41) and the upper clamping seat (11); when the rack fixing disk (41) is in the lower limit position, there is a gap between the movable disk (13) and the upper clamping seat (11), and the upper clamping block (12) falls under the action of gravity, so that the accommodating space defined and surrounded by all the upper clamping blocks (12) is larger than the diameter of the armored cable (5).

5. The polar ice well-throwing cable cutting device according to claim 1, characterized in that, The clamping adjustment rod (47) has an elbow at its upper end, and the rack fixing plate (41) has a rectangular groove for the elbow to move up and down.

6. The polar ice well-throwing cable cutting device according to claim 1, characterized in that, The protective sleeve (2) is a cylindrical structure used to accommodate and guide the relative movement of the upper clamping module (1), the cutting module (3) and the lower clamping module (4).

7. The polar ice well-throwing cable cutting device according to claim 1, characterized in that, The upper clamping seat (11) and the protective sleeve (2) are connected by threads, as are the tool holder fixing plate (31) and the protective sleeve (2).

8. The polar ice well-throwing cable cutting device according to claim 1, characterized in that, After the cable cutting device completes the cutting of the armored cable (5), the upper clamping block (12) achieves self-locking under the combined action of the conical surface of the upper clamping seat (11) and the armored cable (5), and is recovered to the ground along with the armored cable (5).

9. The polar ice well-throwing cable cutting device according to claim 1, characterized in that, The cable cutting device is suitable for armored cables (5) of different diameters by changing the blade holder (35) and the cutting blade (34) of different specifications.

10. A method for cutting cables using a polar ice well-throwing cable cutting device as described in any one of claims 1-9, characterized in that, Includes the following steps: The armored cable (5) is passed through the center holes of the lower clamping seat (44), the pad (45), the tool holder body (35), the rack fixing plate (41), the first spring (14), the moving plate (13), and the upper clamping seat (11) in sequence; The cable cutting device is suspended above the borehole opening. The lower clamping module (4) falls under the action of gravity, so that the rack fixing plate (41) contacts the tool holder fixing plate (31). At this time, neither the upper clamping module (1) nor the lower clamping module (4) clamps the armored cable (5). Release the cable cutting device so that it slides down the armored cable (5) to the jamming position; The lower clamping seat (44) contacts the stuck drill bit (6) and stops moving. The upper clamping module (1) and the cutting module (3) continue to move downward under the action of inertia, so that the upper clamping module (1) and the lower clamping module (4) can clamp the armored cable (5). The armored cable (5) is lifted up, causing the cutting module (3) to move upward relative to the rack (42), and the cutter (34) cuts into and cuts the armored cable (5) under the push of the rack (42); After cutting, continue to lift the armored cable (5) to drive the cable cutting device back to the ground.

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