Corer for coal bed gas exploration

Abstract

The utility model discloses a coal bed gas exploration corer, and relates to the technical field of coal bed gas exploration. Comprising an outer pipe, a motor, a lead screw, a transmission frame, a coring pipe, cutting teeth and a positioner, the motor is fixedly arranged at the top of the inner side of the outer pipe, the output end of the motor faces downwards, and the lead screw is fixedly connected to the output end of the motor; the transmission frame is in a hollow cylinder shape and is slidably installed in the outer pipe, and the end of the lead screw penetrates through a top hole of the transmission frame in a threaded connection mode and extends into the transmission frame. The lower end of the transmission frame is connected to the top end of the coring pipe in a threaded connection mode. The coring pipe is cylindrical, and the outer side face of the coring pipe is attached to the inner wall of the outer pipe. Cutting teeth are respectively arranged at the lower end of the outer pipe and the lower end of the coring pipe; and a positioner is arranged at the top end in the coring pipe. According to the device, a sample and a coal seam can be broken, then the sample is shrunk into the device, the sample is prevented from colliding with the inner wall of an exploration hole in the taking-out process, and meanwhile the sample can be taken out of the device conveniently.

Description

Technical Field

[0001] The utility model relates to the technical field of coalbed methane exploration, in particular to a coalbed methane exploration coring device. Background Art

[0002] Coalbed methane is natural gas stored in coal seams. Its content, distribution and production are all related to the properties of the coal, geological conditions and burial depth. In order to accurately assess the reserves and mining potential of coalbed methane, exploration and coring analysis are required. A coalbed methane exploration coring device is a tool used to collect coal seam samples. It can take coal seam samples out underground. By analyzing the physical and chemical properties of the samples, information such as the occurrence, reservoir characteristics and gas composition of coalbed methane can be determined.

[0003] However, the existing coalbed methane exploration coring device needs to fracture the sample in advance when it is used. It cannot break the sample and the coal seam by itself. In addition, during the removal process, the sample will collide with the inner wall of the exploration hole, resulting in incomplete sample removal. At the same time, the sample is easily stuck inside the core tube, making it inconvenient to remove the sample inside the device.

[0004] Therefore, it is necessary to improve the existing core drill to solve the above problems. Summary of the Invention

[0005] The utility model provides an improved coalbed methane exploration coring device to solve the problem that the samples taken out by the existing coalbed methane exploration coring device are incomplete and easily stuck.

[0006] The utility model is realized through the following technical scheme: a coalbed methane exploration coring device, comprising an outer tube, an electric motor, a lead screw, a transmission frame, a coring tube, cutting teeth and a locator, wherein the electric motor is fixedly provided on the inner top of the outer tube, the output end of the motor faces downward, and the lead screw is fixedly connected to the output end of the motor; the transmission frame is hollow cylindrical and slidably installed inside the outer tube, the end of the lead screw passes through the top hole of the transmission frame by a threaded connection and extends to the interior of the transmission frame; the lower end of the transmission frame is connected to the top of the coring tube by a threaded connection, the coring tube is cylindrical and the outer side surface is arranged to fit the inner wall of the outer tube; the lower end of the outer tube and the lower end of the core tube are respectively provided with cutting teeth, and the inner top of the core tube is provided with a locator.

[0007] Furthermore, the transmission frame includes a frame body, a slide and a slider, the lead screw is threadedly connected through the threaded hole on the top of the frame body and extends into the interior of the frame body, and a slide is opened on each radial outer side of the frame body, and the slide is arranged axially; a slider is installed for sliding inside the slide, wherein the outer side of the slider is fixed to the inner wall of the outer tube; the lower end of the frame body is connected to the top of the core tube by a threaded connection. Such an arrangement can enable the frame body to drive the core tube to slide inside the outer tube under the action of the lead screw.

[0008] Furthermore, the core sampling tube includes a tube body, a fixing plate, a positioning hole and a material extraction hole. The upper end of the tube body is connected to the lower end of the frame body by threaded engagement, and a fixing plate is fixed inside the upper end of the tube body, wherein a plurality of positioning holes are opened on the fixing plate, and the positioning holes are evenly distributed on the plate surface along the circumference, and a locator is provided at the center position of the fixing plate; a plurality of material extraction holes are opened through the outer side surface of the tube body, and cutting teeth are provided at the lower end of the tube body. Such an arrangement facilitates the complete removal of the sample from the inside of the tube body. If it still cannot be taken out, the sample can be crushed through the material extraction hole.

[0009] Furthermore, the locator includes a mounting plate, a limiting column, a tapered column, a stud, and a nut. The mounting plate is mounted at the center of the bottom surface of the fixing plate via the stud and nut, and a plurality of limiting columns are fixed to the upper side of the mounting plate. The positions of the limiting columns match the positions of the positioning holes and the limiting columns are slidably arranged in the corresponding positioning holes. The tapered column is fixed at the center of the lower side of the mounting plate with the tip facing downward, and the outer side of the tapered column is provided with an external thread. This arrangement enables the lower end of the sample to be broken from the coal seam, and the locator can be removed from the core tube along with the sample.

[0010] Compared with the prior art, the present invention has the following beneficial effects: the present invention is a coalbed methane exploration coring device: ① The transmission frame is set up, after the sample is fixed inside the coring tube, the lead screw can be driven by the motor to drive the coring device to slide upward inside the outer tube, thereby retracting the coring tube into the inner part of the outer tube, thereby avoiding the sample from contacting the inner wall of the exploration hole during the removal process; ② The setting of the coring tube, after the device is taken out of the exploration hole, can push the sample through the extraction hole, so that the sample can be completely taken out from the inside of the tube body. If it still cannot be taken out, the sample can be crushed through the extraction hole; ③ The positioner The setting is that when it is used, the mounting plate can be first fixed to the lower side of the fixing plate by bolts. During the coring process, the limit column can make the locator rotate with the coring tube, so that the conical column is inserted into the upper end of the sample. When the upper end of the sample contacts the lower side of the mounting plate, as the coring tube rotates again, the conical column can increase the friction between the sample and the coring tube, so that the lower end of the sample is broken from the coal seam, and the conical column can prevent the sample from slipping inside the coring tube. When the sample needs to be taken out from the coring tube, the bolts between the mounting plate and the fixing plate can be removed, so that the locator can be taken out from the coring tube along with the sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural diagram of the present utility model.

[0012] Figure 2 It is a schematic structural diagram of the transmission frame of the present utility model.

[0013] Figure 3 It is a structural schematic diagram of the core tube of the present utility model.

[0014] Figure 4 It is a schematic diagram of the structure of the positioner of the utility model.

[0015] The markings in the figure are as follows: 1-outer tube, 2-motor, 3-screw, 4-transmission frame, 41-frame, 42-slide, 43-slider, 5-coring tube, 51-tube body, 52-fixing plate, 53-positioning hole, 54-feeding hole, 6-cutting tooth, 7-locator, 71-mounting plate, 72-limiting column, 73-tapered column, 74-stud. DETAILED DESCRIPTION

[0016] The specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0017] In the description of the present invention, it should be understood that the terms "upper", "middle", "outer", "inner", "all around" and the like indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0018] A coalbed methane exploration corer, such as Figure 1 As shown, it includes an outer tube 1, a motor 2, a screw 3, a transmission frame 4, a core tube 5, cutting teeth 6 and a locator 7. The motor 2 is fixedly provided on the inner top of the outer tube 1, the output end of the motor 2 is downward, and the screw 3 is fixedly connected to the output end of the motor 2; the transmission frame 4 is hollow cylindrical and slidably installed inside the outer tube 1, and the end of the screw 3 passes through the top hole of the transmission frame 4 by a threaded connection and extends to the interior of the transmission frame 4; the lower end of the transmission frame 4 is connected to the top of the core tube 5 by a threaded connection, and the core tube 5 is cylindrical and the outer side surface is arranged to fit the inner wall of the outer tube 1; the lower end of the outer tube 1 and the lower end of the core tube 5 are respectively provided with cutting teeth 6, and the inner top of the core tube 5 is provided with a locator 7.

[0019] This embodiment adopts the following preferred solutions:

[0020] 1) If Figure 2 As shown, the transmission frame 4 includes a frame body 41, a slide 42 and a slider 43. The lead screw 3 is threadedly connected and passes through the threaded hole at the top of the frame body 41 and extends into the interior of the frame body 41. A slide 42 is opened on each radial outer side surface of the frame body 41, and the slide 42 is arranged axially; a slider 43 is slidably installed inside the slide 42, wherein the outer side surface of the slider 43 is fixed to the inner wall of the outer tube 1; the lower end of the frame body 41 is connected to the top of the core tube 5 by a threaded connection; when the lead screw 3 is driven by the motor 2 and rotates, the frame body 41 drives the core tube 5 to slide up and down inside the outer tube 1 due to the cooperation of the slider 43 and the slide 42.

[0021] 2) If Figure 3As shown, the core tube 5 includes a tube body 51, a fixing plate 52, a positioning hole 53 and a material extraction hole 54. The upper end of the tube body 51 is connected to the lower end of the frame 41 by threaded engagement, and a fixing plate 52 is fixed inside the upper end of the tube body 51, wherein a plurality of positioning holes 53 are opened on the fixing plate 52, and the positioning holes 53 are evenly distributed on the plate surface along the circumference. A locator 7 is provided at the center position of the fixing plate 52; a plurality of material extraction holes 54 are opened through the outer side surface of the tube body 51, and a cutting tooth 6 is provided at the lower end of the tube body 51; after the device is taken out of the exploration hole, the sample can be pushed through the material extraction hole 54, so that the sample can be completely taken out from the inside of the tube body 51. If it still cannot be taken out, the sample can be crushed through the material extraction hole 54.

[0022] 3) If Figure 4 As shown, the positioner 7 includes a mounting plate 71, a limiting column 72, a conical column 73, a stud 74 and a nut. The mounting plate 71 is installed at the center position of the bottom surface of the fixing plate 52 through the stud 74 and the nut, and a number of limiting columns 72 are fixed on the upper side of the mounting plate 71. The position of the limiting column 72 matches the position of the positioning hole 53 and the limiting column 72 is slidably set in the corresponding positioning hole 53; the conical column 73 is fixedly set at the center position of the lower side of the mounting plate 71 with the tip facing downward, and the outer side of the conical column 73 is provided with an external thread. When in use, the mounting plate 71 can be first fixed to the lower side of the fixing plate 52 by bolts. During the coring process, the limiting column 72 can make the locator 7 rotate along with the coring tube 5, so that the conical column 73 is inserted into the upper end of the sample. When the upper end of the sample contacts the lower side of the mounting plate 71, as the coring tube 5 rotates again, the conical column 73 can increase the friction between the sample and the coring tube 5, so that the lower end of the sample is broken from the coal seam, and the conical column 73 can prevent the sample from slipping inside the coring tube 5. When the sample needs to be taken out from the coring tube 5, the bolts between the mounting plate 71 and the fixing plate 52 can be removed, so that the locator 7 can be taken out from the coring tube 5 along with the sample.

[0023] The specific operation of this embodiment is as follows: when in use, first, the device is moved to the position where sampling is required under the action of the drilling rig, so that the sample is inserted into the core tube 5, and then, under the action of the locator 7, the lower end of the sample is broken from the coal seam. After the sample is broken, the motor 2 can drive the lead screw 3 to rotate, thereby driving the core tube 5 to be retracted into the outer tube 1, and then the device is taken out of the exploration hole through the drilling rig, and then the core tube 5 is moved to the outside of the outer tube 1 through the cooperation of the motor 2, the lead screw 3 and the transmission frame 4, and then the core tube 5 is removed from the transmission frame 4, so that the sample and the locator 7 are taken out from the core tube 5.

[0024] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments do not describe all details in detail, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A coalbed methane exploration coring device, comprising an outer tube (1), a motor (2), a lead screw (3), a transmission frame (4), a coring tube (5), cutting teeth (6) and a positioner (7), characterized in that: The top inner side of the outer tube (1) is fixedly provided with a motor (2), the output end of the motor (2) is downward, and the lead screw (3) is fixedly connected to the output end of the motor (2); the transmission frame (4) is hollow cylindrical and slidably mounted inside the outer tube (1), the end of the lead screw (3) passes through the top hole of the transmission frame (4) by means of a threaded connection and extends into the interior of the transmission frame (4); the lower end of the transmission frame (4) is connected to the top end of the core tube (5) by means of a threaded connection, the core tube (5) is cylindrical and the outer side surface is arranged to fit the inner wall of the outer tube (1); the lower end of the outer tube (1) and the lower end of the core tube (5) are each provided with a cutting tooth (6), and the inner top end of the core tube (5) is provided with a positioner (7).

2. A coalbed methane exploration corer according to claim 1, characterized in that: The transmission frame (4) includes a frame body (41), a slideway (42) and a slider (43), the lead screw (3) is threadedly connected to pass through the threaded hole at the top of the frame body (41) and extends into the interior of the frame body (41), and a slideway (42) is opened on each radial outer side surface of the frame body (41), and the slideway (42) is arranged along the axial direction; a slider (43) is slidably installed inside the slideway (42), wherein the outer side surface of the slider (43) is fixed to the inner wall of the outer tube (1); the lower end of the frame body (41) is connected to the top of the core tube (5) by a threaded connection.

3. A coalbed methane exploration corer according to claim 2, characterized in that: The core tube (5) comprises a tube body (51), a fixing plate (52), a positioning hole (53) and a material extraction hole (54), wherein the upper end of the tube body (51) is connected to the lower end of the frame body (41) by threaded engagement, and a fixing plate (52) is fixed inside the upper end of the tube body (51), wherein a plurality of positioning holes (53) are opened on the fixing plate (52), and the positioning holes (53) are evenly distributed on the plate surface along the circumference, and a positioner (7) is provided at the center position of the fixing plate (52); a plurality of the material extraction holes (54) are opened through the outer side surface of the tube body (51), and a cutting tooth (6) is provided at the lower end of the tube body (51).

4. A coalbed methane exploration corer according to claim 3, characterized in that: The positioner (7) includes a mounting plate (71), a limiting column (72), a tapered column (73), a stud (74) and a nut. The mounting plate (71) is mounted at the center of the bottom surface of the fixing plate (52) through the stud (74) and the nut, and a plurality of limiting columns (72) are fixed on the upper side of the mounting plate (71). The positions of the limiting columns (72) match the positions of the positioning holes (53) and the limiting columns (72) are slidably arranged in the corresponding positioning holes (53); the tapered column (73) is fixedly arranged at the center of the lower side of the mounting plate (71) with the tip facing downward, and the outer side of the tapered column (73) is provided with an external thread.

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