Device for fishing broken drill bit and drill rod in coal field drilling hole

Abstract

The invention relates to a device for salvaging a drill bit and a drill rod broken in a coalfield drilling hole. The device comprises a salvaging main body, a rope and a winch. The rope corresponds to the winch one by one. The rope is connected to the top of the salvaging main body, and the salvaging main body is lowered or pulled up by the winch. A plurality of infrared distance detectors are arranged at the bottom of the salvaging main body, which are used to detect the position and shape of the drill bit and the drill rod dropped into the well. A plurality of movable clamping bodies are arranged on the lower surface of the salvaging main body, which can move back and forth between the edge and the center of the salvaging main body. The clamping bodies strike the broken end of the drill rod from all directions, which can change the inclination angle of the drill rod and make the drill bit sunk in the formation loose by using the principle of lever. A driving motor is arranged at the top of the salvaging main body, which is connected to a rotating groove. The clamping body entering the rotating groove can clamp the broken end of the drill rod. The driving motor drives the drill rod to rotate through the rotating groove and the clamping body, so that the drill rod is separated from the drill bit, and the drill rod is taken out first, and then the drill bit is taken out.

Description

Technical Field

[0001] The invention belongs to the technical field of coalfield drilling equipment, and in particular relates to a device for fishing a broken drill bit and drill rod in a coalfield drilling hole. Background Art

[0002] During the coalfield drilling process, due to improper operation or other reasons, the drill pipe is twisted off, causing the drill bit and drill pipe to fall off in the borehole. When this happens, the drill bit is generally lost at a depth of tens to hundreds of meters underground, and it is impossible to bring the drill bit and drill pipe to the surface using simple operating tools such as hands. Moreover, the state of the drill bit before it breaks is: rotating at a certain speed, drilling into the stratum below, and the bottom of the drill bit directly contacts the bottom of the borehole. After the drill bit breaks, under the action of inertia, it continues to rotate and drill into the stratum below, causing part of the drill bit to be inserted into the stratum and difficult to pull out. On the other hand, due to the continued short-term rotation of the drill bit, the broken drill pipe may be tilted, causing the drill bit and drill pipe to present an unknown tilt or non-tilt state. Ordinary salvage devices do not have a good response method for the above situation, and cannot quickly and effectively salvage the drill bit and drill pipe. Summary of the invention

[0003] In view of the above problems, the present invention provides a device for salvaging a drill bit and drill rod broken in a coalfield drilling hole, comprising a salvage main body, a plurality of ropes and a winch, wherein the ropes correspond to the winch one by one, the plurality of ropes are connected to the top of the salvage main body, and the salvage main body is lowered or pulled up by the winch;

[0004] The bottom of the salvage main body is equipped with several infrared distance detectors to detect the position and shape of the drill bit and drill pipe dropped into the well; the lower surface of the salvage main body is also equipped with several movable clamping bodies, which can move back and forth between the edge and center of the salvage main body. The clamping bodies hit the broken end of the drill pipe from all directions, which can not only change the inclination angle of the drill pipe, but also use the principle of leverage to loosen the drill bit stuck in the formation;

[0005] A driving motor is provided on the top of the salvage main body, which is connected to the rotating groove. The clamping body entering the rotating groove can clamp the broken end of the drill pipe. The driving motor drives the drill pipe to rotate through the rotating groove and the clamping body, so that the drill pipe is separated from the drill bit. The drill pipe is taken out first, and then the drill bit is taken out.

[0006] Optionally, the salvage main body is a flat cylinder with a hollow interior, and a control mechanism for controlling the movement of the clamping body is provided inside; a driving motor is installed on the upper surface of the salvage main body, and a rotating shaft of the driving motor penetrates into the interior of the salvage main body and is then connected to a rotating plate at the bottom of the salvage main body;

[0007] The clamping body is arc-shaped. When the clamping body stays at the edge of the salvage main body, several clamping bodies can form a circle, and the circle is concentrically arranged with the salvage main body;

[0008] A balancing and fixing device is provided above the driving motor. The balancing and fixing device includes a plurality of telescopic rods. When the position of the salvaging main body needs to be fixed, the telescopic rods are extended so that the ends thereof are against the inner wall of the borehole.

[0009] Further optionally, a plurality of connecting rings are provided on the top of the salvage main body for connecting ropes; the angles formed by any two adjacent connecting rings and the center of the circle on the upper surface of the salvage main body are equal; the ropes are connected to corresponding winches on the ground, and the winches are evenly arranged around the circumference of the drilling wellhead.

[0010] Further optionally, the plurality of infrared distance detectors are arranged in a circle and are disposed inside the salvage main body, and the probes of the infrared distance detectors are exposed on the lower surface of the salvage main body, so as to detect the borehole below the salvage main body.

[0011] Further optionally, the balancing fixing device includes a telescopic controller in the middle and a plurality of telescopic rods around the telescopic controller, the telescopic controller is arranged on the top of the driving motor, and the plurality of telescopic rods are evenly arranged around the telescopic controller;

[0012] When the salvage body moves up and down, the telescopic controller controls each telescopic rod to shorten so as not to touch the inner wall of the borehole; when the position of the salvage body needs to be fixed, the telescopic controller controls each telescopic rod to extend so that the end portion contacts the inner wall of the borehole.

[0013] Further optionally, the control mechanism includes a plurality of movable plates and a plurality of springs, the top surface inside the salvage main body is provided with a plurality of upwardly concave movable grooves, the top of the movable plate is slidably connected to the corresponding movable grooves through a slider, and an electromagnetic device is provided inside the slider for controlling the bottom of the slider to bulge downward or reset upward;

[0014] A number of springs are provided on the bottom surface inside the salvage main body, and the springs correspond to the moving grooves one by one. Both the single spring and the moving rod are arranged along the radial direction of the salvage main body (in a radial shape). A fixing block is provided at one end of the spring close to the center of the salvage main body for fixing the position of the spring. The fixing block is arranged on the bottom surface inside the salvage main body, and a horizontal connecting rod is provided at the other end. One end of the connecting rod is connected to the top of the clamping body through the connecting block. A hollow strip is provided under each spring, and the connecting block passes through the hollow strip to connect to the clamping body. When the spring is extended or retracted, the connecting block moves along the corresponding hollow strip.

[0015] Further optionally, the movable plate is in the shape of a vertical downward plate, and has a notch at its lower portion, the notch penetrates the movable plate in the thickness direction of the movable plate, and the bottom of the notch penetrates the bottom edge of the movable plate; the width of the notch is greater than the outer diameter of the connecting rod and smaller than the width of the connecting block, so that the movable plate is clamped to the connecting block through the notch.

[0016] Further optionally, when all the clamping bodies are at the edge of the salvage main body, the two side surfaces of the clamping bodies respectively contact the side surfaces of the adjacent clamping bodies on both sides, but the side surfaces of the adjacent clamping bodies do not squeeze each other, and the broken end of the drill pipe can be surrounded, so as to facilitate the application of striking force to the drill pipe from all directions;

[0017] The side of the clamping body facing the center of the salvage main body is the striking surface, and the striking surface is an arc-shaped surface, which is convenient for better contacting the side of the cylindrical drill pipe and applying striking force to the drill pipe.

[0018] Further optionally, a miniature force detector is provided inside the clamping body for detecting the force condition when the clamping body strikes the drill rod.

[0019] Optionally, a movable circular rotating plate is provided at the center of the lower surface of the salvage main body, the rotating plate and other parts of the lower surface of the salvage main body are on the same plane, a circular hollow gap is left between the edge of the rotating plate and the main plate of the lower surface of the salvage main body, all spring fixing blocks are provided on the rotating plate, the center of the rotating plate is connected to the bottom end of the rotating shaft of the driving motor, and can drive the rotating plate to rotate;

[0020] One end of the connecting rod connected to the spring is provided with an openable and closable switch ring, and when the switch ring is opened, the connecting rod is disconnected from the spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of the salvage main body;

[0022] Figure 2 It is a schematic diagram of the lower surface of the salvaged main body;

[0023] Figure 3 It is a side view of the salvage main body.

[0024] In the accompanying drawings, 1-drill rod, 2-hollow bar, 3-rotating plate, 4-salvage main body, 5-connecting ring, 6-driving motor, 7-telescopic rod, 8-rotating shaft, 9-clamping body, 10-connecting block, 11-connecting rod, 12-strike surface, 13-spring, 14-fixed block, 15-moving plate, 16-slider, 17-moving groove. DETAILED DESCRIPTION

[0025] This embodiment provides a device for fishing a broken drill bit and drill rod in a coal field drilling hole, such as Figure 1-Figure 3 As shown, it includes a salvage main body 4, a plurality of ropes and a winch, the ropes correspond to the winch one by one, a plurality of ropes are connected to the top of the salvage main body 4, and the salvage main body 4 is lowered or pulled up by the winch;

[0026] The bottom of the salvage main body 4 is provided with a plurality of infrared distance detectors for detecting the position and shape of the drill bit and drill pipe dropped into the well; the lower surface of the salvage main body 4 is also provided with a plurality of movable clamping bodies 9, which can move back and forth between the edge and the center of the salvage main body 4. The clamping bodies 9 strike the broken end of the drill pipe 1 from all directions, which can change the inclination angle of the drill pipe 1 and use the lever principle to loosen the drill bit stuck in the formation;

[0027] A driving motor 6 is provided on the top of the salvage main body 4, and the driving motor 6 is connected to the rotating groove. The clamping body 9 entering the rotating groove can clamp the broken end of the drill rod 1. The driving motor 6 drives the drill rod 1 to rotate through the rotating groove and the clamping body 9, so that the drill rod 1 is separated from the drill bit. The drill rod 1 is taken out first, and then the drill bit is taken out.

[0028] The device provided by the present invention fully considers the complex situation that the drill bit is stuck in the formation and the drill rod 1 may be tilted, and solves it in a targeted manner. The salvage main body 4 is lowered to a position close to the drill rod 1, and the infrared distance detector is first used to detect the position and state of the drill bit of the drill rod 1 below, whether the drill bit and the drill rod are tilted, and the specific tilt angle. Then the position of the salvage main body 4 is adjusted in a targeted manner, and the clamping body 9 that can move the lower surface of the salvage main body 4 is used to strike the broken end of the top of the drill rod 1 in all directions, which can not only loosen the drill bit and reduce the force required to pull out the drill bit, but also correct the tilt angle of the drill bit and the drill rod, and restore the vertical state of the drill bit and the drill rod to facilitate salvage. At present, most of the connection forms between the drill bit and the drill rod 1 are threaded connections. The drive motor 6 and the rotating groove of the present invention can clamp the top of the drill rod 1. By rotating the drill rod 1, the drill bit and the drill rod are separated, and then taken out separately, which reduces the difficulty of salvage.

[0029] Optionally, the salvage main body 4 is a flat cylinder with a hollow interior, and a control mechanism for controlling the movement of the clamping body 9 is provided inside; a driving motor 6 is installed on the upper surface of the salvage main body 4, and a rotating shaft 8 of the driving motor 6 penetrates into the salvage main body 4 and is then connected to a rotating plate 3 at the bottom of the salvage main body 4;

[0030] The clamping body 9 is arc-shaped. When the clamping body 9 stays at the edge of the salvage main body 4, a plurality of clamping bodies 9 can form a circle, and the circle is concentrically arranged with the salvage main body 4;

[0031] A balancing and fixing device is provided above the driving motor 6, and the balancing and fixing device includes a plurality of telescopic rods 7. When the position of the salvaging body 4 needs to be fixed, the telescopic rods 7 are extended so that the ends thereof are against the inner wall of the borehole.

[0032] Further optionally, a plurality of connecting rings 5 ​​are provided on the top of the salvage main body 4 for connecting ropes; the angles formed by any two adjacent connecting rings 5 ​​and the center of the upper surface of the salvage main body 4 are equal;

[0033] The rope is connected to the corresponding winch on the ground, and the winch is evenly arranged around the circumference of the borehole. During the descent of the salvage body 4 in the borehole, the corresponding set of connecting rings 5, ropes and winches are in the same orientation and correspond to each other up and down, so that the salvage body 4 can descend smoothly without the ropes getting entangled with each other.

[0034] Further optionally, the plurality of infrared distance detectors are arranged in a circle and are arranged inside the salvage main body 4, and the probe of the infrared distance detector is exposed on the lower surface of the salvage main body 4, so as to detect the borehole below the salvage main body 4; the circle formed by the plurality of infrared distance detectors is arranged concentrically with the salvage main body 4, and the plurality of infrared distance detectors are evenly arranged along the circumference of the circle. The lower surface of the salvage main body 4 is provided with a plurality of through holes, so that the probe of the infrared distance detector can emit infrared rays outward through the corresponding through holes.

[0035] The salvage device of the present invention first detects the drill bit and drill rod in the borehole to grasp their position and status information. Specifically, all winches lower the salvage main body 4 into the borehole at the same speed, and the salvage main body 4 descends in a horizontal posture. When the lower surface of the salvage main body 4 touches the broken end of the drill rod 1, the force on the rope changes, and the control device connected to the winch can detect the force change, so the lowering operation of the winch starts to lift the salvage main body 4 upward for a short distance, so that the salvage main body 4 is restored to a horizontal state (each rope is under the same force).

[0036] The infrared distance detector is connected to the control device on the ground through communication. The control device turns on all infrared distance detectors. The infrared distance detector emits infrared rays vertically downward. When the infrared rays encounter an obstruction, they return to the probe along the original path. The control device calculates the position of the drill bit or drill rod 1 directly below the infrared distance detector by the time of transmitting the signal and receiving the return signal. The data measured by all infrared distance detectors are collected together to obtain the morphological information of the drill bit and drill rod below the salvage main body 4, including but not limited to whether the drill rod 1 is tilted and the tilt angle, whether the drill bit is tilted and the tilt angle, the depth of the drill bit sunk into the formation, and the specific position of the drill rod 1 and the drill bit.

[0037] Further optionally, the balancing fixing device includes a telescopic controller in the middle and a plurality of telescopic rods 7 around the telescopic controller, the telescopic controller is arranged on the top of the driving motor 6, and the plurality of telescopic rods 7 are evenly arranged around the telescopic controller;

[0038] When the salvage body 4 moves up and down, the telescopic controller controls each telescopic rod 7 to shorten and not contact the inner wall of the borehole; when the position of the salvage body 4 needs to be fixed, the telescopic controller controls each telescopic rod 7 to extend so that the end portion contacts the inner wall of the borehole.

[0039] Preferably, when the salvage main body 4 moves up and down, the end of each telescopic rod 7 does not exceed the edge of the salvage main body 4, and can also play a role in balancing the salvage main body 4. The telescopic rod 7 and the connecting ring 5 are staggered.

[0040] Further optionally, the control mechanism includes a plurality of movable plates 15 and a plurality of springs 13, the top surface inside the salvage main body 4 is provided with a plurality of upwardly concave movable grooves 17, the top of the movable plate 15 is slidably connected to the corresponding movable grooves 17 through a slider 16, and an electromagnetic device is provided inside the slider 16 for controlling the bottom of the slider 16 to bulge downward or reset upward;

[0041] A plurality of springs 13 are provided on the bottom surface of the salvage main body 4. The springs 13 correspond to the moving grooves 17 one by one. Both the single spring 13 and the moving rod are arranged along the radial direction of the salvage main body 4 (in a radial shape). A fixing block 14 is provided at one end of the spring 13 close to the center of the salvage main body 4 to fix the position of the spring 13. The fixing block 14 is arranged on the bottom surface of the salvage main body 4. A horizontal connecting rod 11 is provided at the other end. One end of the connecting rod 11 is connected to the top of the clamping body 9 through the connecting block 10. A hollow bar 2 is provided under each spring 13. The connecting block 10 passes through the hollow bar 2 to connect the clamping body 9. When the spring 13 is extended or retracted, the connecting block 10 moves along the corresponding hollow bar 2. The width of the hollow bar is preferably greater than the width of the spring.

[0042] Further optionally, the movable plate 15 is in the shape of a vertically downward plate, and has a notch at its lower portion, the notch penetrates the movable plate 15 in the thickness direction of the movable plate 15, and the bottom of the notch penetrates the bottom edge of the movable plate 15; the width of the notch is greater than the outer diameter of the connecting rod 11 and smaller than the width of the connecting block 10, so that the movable plate 15 is clamped to the connecting block 10 through the notch.

[0043] The movement mode of the plurality of clamping bodies 9 of the present invention is as follows: when the spring 13 is not subjected to force and is in a natural state, the clamping body 9 connected by the connecting rod 11 and the connecting block 10 is pulled back by the spring 13 to a position close to the center of the salvage main body 4 and can stay at this position; the moving plate 15 moves along the moving groove 17 to above the connecting rod 11, the bottom of the slider 16 protrudes downward, pushing the moving plate 15 to move downward, and the connecting rod 11 enters the notch, so that the connecting rod 11 further moves along the notch and enters the inside of the notch, and one side of the moving plate 15 faces the connecting block 10; the moving groove 17 is parallel to the corresponding hollow The slider 16 drives the moving plate 15 to move along the moving groove 17 toward the edge of the salvage main body 4, and then drives the clamping body 9 to move along the hollow bar 2 toward the edge of the salvage main body 4 through the connecting block 10, and the spring 13 is stretched by the tension; when the clamping body 9 needs to return to the position close to the center of the salvage main body 4, the bottom of the slider 16 resets upward, pulling the moving plate 15 up, so that the connecting rod 11 is separated from the moving plate 15 from the bottom of the notch, and the spring 13 loses the tension and immediately rebounds and resets, pulling the clamping body 9 to move quickly toward the center of the salvage main body 4, and can hit the top of the drill pipe 1. Each slider 16 can be controlled separately, that is, the movement of each clamping body 9 can be controlled separately.

[0044] Further optionally, when all the clamping bodies 9 are at the edge of the salvage main body 4, the two side surfaces of the clamping body 9 respectively contact the side surfaces of the adjacent clamping bodies 9 on both sides, but the side surfaces of the adjacent clamping bodies 9 do not squeeze each other, and the broken end of the drill pipe 1 can be surrounded, so that it is convenient to apply striking force to the drill pipe 1 from all directions;

[0045] The side of the clamping body 9 facing the center of the salvage main body 4 is the striking surface 12, which is an arc-shaped surface for better contacting the side of the cylindrical drill pipe 1 and applying striking force to the drill pipe 1. Preferably, a rubber gasket is laid on the striking surface 12.

[0046] Further optionally, a miniature force detector is provided inside the clamping body 9 for detecting the force condition when the clamping body 9 strikes the drill rod 1 .

[0047] After the infrared distance detector detects the position and shape information of the drill bit and the drill rod, the infrared distance detector is turned off. According to the information after detection and analysis, the position of the top of the drill rod 1 is determined, and the position of the salvage main body 4 is adjusted by adjusting the length of each telescopic rod 7, so that the center of the salvage main body 4 is opposite to the center of the top of the drill rod 1. According to the inclination angle of the drill bit and the rotation direction of the drill bit during the previous drilling, the clamping body 9 is released in sequence in the opposite direction of the drill bit rotation, so that the drill rod 1 drives the drill bit to loosen in the opposite direction of the drilling. At the same time, during the striking process, the inclination of the drill rod 1 and the drill bit is gradually corrected to restore their vertical state, which is convenient for subsequent salvage. The force detector of each clamping body 9 detects the force of each impact on the drill rod 1. At the beginning, the drill bit is stuck in the formation and is not easy to shake. The clamping body 9 hits the drill rod 1, and the drill rod 1 basically does not move. The impact force is relatively large. Later, the drill bit gradually loosens, and the drill rod 1 will also shift slightly after being hit. The impact force gradually decreases. When the impact force decreases to a certain extent, it means that the drill bit is completely loose. At this time, it is only necessary to overcome the gravity of the drill bit when salvaging the drill bit.

[0048] Optionally, a movable circular rotating plate 3 is provided at the center of the lower surface of the salvage main body 4, the rotating plate 3 and other parts of the lower surface of the salvage main body 4 are on the same plane, a circular hollow gap is left between the edge of the rotating plate 3 and the main plate of the lower surface of the salvage main body 4, all the fixing blocks 14 of the springs 13 are provided on the rotating plate 3, the center of the rotating plate 3 is connected to the bottom end of the rotating shaft 8 of the driving motor 6, and can drive the rotating plate 3 to rotate;

[0049] One end of the connecting rod 11 connected to the spring 13 is provided with an openable and closable switch ring. When the switch ring is opened, the connecting rod 11 is disconnected from the spring 13.

[0050] When each clamping body 9 hits the drill rod 1, it hits individually, that is, only one clamping body 9 hits the drill rod 1 at a time. Under the pulling force of the spring 13 to reset, the connecting block 10 pulls the clamping body 9 to move along the corresponding hollow strip 2. The outer diameter of the drill rod 1 is almost the same as the diameter of the rotating plate 3. The clamping body 9 hits the drill rod 1 and is blocked by the drill rod 1. At the same time, the connecting block 10 is in the gap between the edge of the rotating plate 3 and the main plate on the lower surface of the salvage main body 4, and then resets to the edge of the salvage main body 4 under the push of the moving plate 15.

[0051] After the drill bit is completely loosened, the clamping body 9 is used to push the drill rod 1 to a vertical state (the drill bit is also vertical). Several preset clamping bodies 9 move toward the drill rod 1 at the same time, and the striking surface 12 is close to the outer side of the drill rod 1. The clamping body 9 surrounds the drill rod 1 for a circle, which is equivalent to clamping the top of the drill rod 1. The connecting blocks 10 of these clamping bodies 9 are in the gap between the edge of the rotating plate 3 and the main plate on the lower surface of the salvage main body 4. At this time, other clamping bodies 9 stay at the edge of the salvage main body 4, and the switch rings of the connecting rods 11 of other clamping bodies 9 are opened and disengaged from the corresponding springs 13. The rotating shaft 8 of the driving motor 6 drives the rotating plate 3 and the clamping body 9 clamping the drill rod 1 to rotate, thereby driving the drill rod 1 to rotate, while the drill bit is fixed, and the drill rod 1 and the drill bit component are separated. Then the salvage main body 4 drives the drill rod 1 to rise to the ground.

[0052] On the ground, the drill rod 1, rotating plate 3, clamping body 9, spring 13, connecting rod 11, and connecting block 10 are removed, and a hollow cylindrical rod body is connected to the bottom of the rotating shaft 8 to replace the threaded part of the drill rod 1 connected to the top of the drill bit. The salvage main body 4 is lowered to the top of the drill bit with the rod body, so that the rod body is sleeved on the top of the drill bit, and the position of the salvage main body 4 is stabilized by the telescopic rod 7. The driving motor 6 rotates the rod body so that the rod body is tightened on the top of the drill bit (in this process, the telescopic rod 7 is intermittently extended and retracted, so that the salvage main body 4 can cooperate with the gradual descent, but it is not driven by the driving motor 6 to rotate). Then the salvage main body 4 drives the drill bit to rise to the ground to complete the salvage.

Claims

1. A device for fishing a broken drill bit or drill rod in a coalfield drilling hole, characterized in that: It includes a salvage main body, a plurality of ropes and a winch, wherein the ropes correspond to the winches one by one, and the plurality of ropes are connected to the top of the salvage main body, and the salvage main body is lowered or pulled up by the winch; The bottom of the salvage main body is equipped with several infrared distance detectors to detect the position and shape of the drill bit and drill pipe dropped into the well; the lower surface of the salvage main body is also equipped with several movable clamping bodies, which can move back and forth between the edge and center of the salvage main body. The clamping bodies hit the broken end of the drill pipe from all directions, which can not only change the inclination angle of the drill pipe, but also use the principle of leverage to loosen the drill bit stuck in the formation; A driving motor is provided on the top of the salvage main body, and the driving motor is connected to the rotating groove. The clamping body entering the rotating groove can clamp the broken end of the drill pipe. The driving motor drives the drill pipe to rotate through the rotating groove and the clamping body, so that the drill pipe is separated from the drill bit, and the drill pipe is taken out first, and then the drill bit is taken out; The salvage main body is a flat cylinder with a hollow interior, and a control mechanism for controlling the movement of the clamping body is arranged inside; the control mechanism includes a plurality of moving plates and a plurality of springs, and a plurality of upwardly concave moving grooves are arranged on the top surface inside the salvage main body, and the top of the moving plate is slidably connected to the corresponding moving grooves through a slider, and an electromagnetic device is arranged inside the slider for controlling the bottom of the slider to bulge downward or reset upward; A number of springs are provided on the bottom surface of the inner part of the salvage main body, and the springs correspond to the movable grooves one by one. The springs and the movable rods are arranged along the radial direction of the salvage main body. A fixing block is provided at one end of the spring close to the center of the salvage main body to fix the position of the spring, and a connecting rod is provided at the other end. One end of the connecting rod is connected to the top of the clamping body through the connecting block. A hollow strip is provided under each spring, and the connecting block passes through the hollow strip to connect to the clamping body. When the spring is expanded or contracted, the connecting block moves along the corresponding hollow strip.

2. The device for fishing a broken drill bit and drill rod in a coalfield drilling hole according to claim 1, characterized in that: A driving motor is installed on the upper surface of the salvage main body, and the rotating shaft of the driving motor penetrates into the interior of the salvage main body and is then connected to a rotating plate at the bottom of the salvage main body; The clamping body is arc-shaped. When the clamping body stays at the edge of the salvage main body, several clamping bodies can form a circle, and the circle is concentrically arranged with the salvage main body; A balancing and fixing device is provided above the driving motor. The balancing and fixing device includes a plurality of telescopic rods. When the position of the salvaging main body needs to be fixed, the telescopic rods are extended so that the ends thereof are against the inner wall of the borehole.

3. The device for fishing a broken drill bit and drill rod in a coalfield drilling hole according to claim 2, characterized in that: The plurality of infrared distance detectors are arranged in a circle inside the salvage main body, and the probes of the infrared distance detectors are exposed on the lower surface of the salvage main body, so as to detect the borehole below the salvage main body.

4. The device for fishing a broken drill bit and drill rod in a coalfield drilling hole according to claim 2, characterized in that: The balancing and fixing device comprises a telescopic controller in the middle and a plurality of telescopic rods around the telescopic controller, wherein the telescopic controller is arranged on the top of the driving motor, and the plurality of telescopic rods are evenly arranged around the telescopic controller; When the salvage body moves up and down, the telescopic controller controls each telescopic rod to shorten so as not to touch the inner wall of the borehole; when the position of the salvage body needs to be fixed, the telescopic controller controls each telescopic rod to extend so that the end portion contacts the inner wall of the borehole.

5. The device for fishing a broken drill bit and drill rod in a coalfield drilling hole according to claim 2, characterized in that: The connecting rod is horizontal.

6. The device for fishing a broken drill bit and drill rod in a coalfield drilling hole according to claim 5, characterized in that: The movable plate is in the shape of a plate pointing vertically downward, and has a notch at its lower part. The notch penetrates the movable plate in the thickness direction of the movable plate, and the bottom of the notch penetrates the bottom edge of the movable plate; the width of the notch is greater than the outer diameter of the connecting rod and smaller than the width of the connecting block, so that the movable plate is clamped with the connecting block through the notch.

7. The device for fishing a broken drill bit and drill rod in a coalfield drilling hole according to claim 6, characterized in that: When all the clamping bodies are at the edge of the salvage main body, the two side surfaces of the clamping bodies contact the side surfaces of the adjacent clamping bodies on both sides respectively, but the side surfaces of the adjacent clamping bodies do not squeeze each other, and the broken end of the drill pipe can be surrounded, making it easy to apply striking force to the drill pipe from all directions; The side of the clamping body facing the center of the salvage main body is the striking surface, and the striking surface is an arc-shaped surface, which is convenient for better contacting the side of the cylindrical drill pipe and applying striking force to the drill pipe.

8. The device for fishing a broken drill bit and drill rod in a coalfield drilling hole according to claim 7, characterized in that: A miniature force detector is arranged inside the clamping body, which is used to detect the force condition when the clamping body strikes the drill rod.

9. The device for fishing a broken drill bit and drill rod in a coalfield drilling hole according to claim 1, characterized in that: The top of the salvage body is provided with a plurality of connection rings for connecting ropes; the angles formed by any two adjacent connection rings and the center of the circle on the upper surface of the salvage body are equal; the ropes are connected to the corresponding winches on the ground, and the winches are evenly arranged around the circumference of the drilling wellhead.

10. The device for fishing a broken drill bit and drill rod in a coalfield drilling hole according to claim 2, characterized in that: A movable circular rotating plate is provided at the center of the lower surface of the salvage main body, the rotating plate and other parts of the lower surface of the salvage main body are on the same plane, a circular hollow gap is left between the edge of the rotating plate and the main plate of the lower surface of the salvage main body, all the spring fixing blocks are arranged on the rotating plate, the center of the rotating plate is connected to the bottom end of the rotating shaft of the driving motor, and can drive the rotating plate to rotate; One end of the connecting rod connected to the spring is provided with an openable and closable switch ring, and when the switch ring is opened, the connecting rod is disconnected from the spring.

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