Ultrasonic imaging logging device for coal bed gas detection

Abstract

The invention discloses an ultrasonic imaging logging device for coal bed gas detection, which belongs to the technical field of coal bed gas detection equipment and comprises a support frame, a controller, a fixing mechanism and a detection mechanism. The fixing mechanism comprises a fixing plate, a double-shaft motor, a first gear and a plurality of second gears. The output end of the top end of the double-shaft motor is connected with the first gear through a rotating shaft. A rotating rod is fixedly connected to the center of the bottom face of the second gear, and a partition plate is slidably connected into the rotating rod and divides an inner cavity of the rotating rod into an upper cavity body and a lower cavity body. A self-tapping cone rod is fixed to one side of the partition plate, a limiting sliding groove is formed in the inner wall of the rotating rod, and a limiting sliding block is slidably connected to the inner wall of the limiting sliding groove and fixedly connected with the outer wall of the partition plate. A pressure assembly is connected to the rotating rod and used for providing self-tapping pressure for the self-tapping cone rod. The well logging device can be quickly fixed to and detached from the ground, operation is convenient, the structural stability is good in the measuring process, and then the accuracy of the measuring result is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of coalbed methane detection equipment, and in particular to an ultrasonic imaging logging device for coalbed methane detection. Background Art

[0002] Coalbed methane, commonly known as gas, is a hydrocarbon gas stored in coal seams. It is an unconventional natural gas and a new potential energy source with huge reserves. It is usually self-generated and self-stored and adsorbed on the surface of coal molecules. During the mining process of coalbed methane, it is necessary to detect the coalbed methane through ultrasonic logging technology to understand the coalbed methane situation and facilitate the subsequent mining plan.

[0003] An existing ultrasonic imaging logging device mainly includes a base, a controller, an ultrasonic detector, a drive motor, a rotating screw and a connecting rod. The base is installed and fixed at the wellhead by bolts. The controller is operated to start the drive motor to drive the connecting rod to move downward, so that the ultrasonic detector penetrates into the logging wellbore, which is convenient for adjustment according to the depth of the logging wellbore. The ultrasonic detector detects the coalbed methane in the logging wellbore during the movement and displays the data at the detection point on a display screen.

[0004] When the above-mentioned existing logging device is used, the corners of the base need to be tightened and fixed one by one by bolts, which not only requires the configuration of corresponding tightening tools, but also the operation during the fixing work is relatively cumbersome, which increases the labor intensity of the staff. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides an ultrasonic imaging logging device for coalbed methane detection, which can quickly fix and detach the logging device from the ground, is easy to operate, and has good structural stability during the measurement process, thereby ensuring the accuracy of the measurement results.

[0006] In order to achieve the above-mentioned object, the present invention provides an ultrasonic imaging logging device for coalbed methane detection, comprising a support frame, a controller, a fixing mechanism and a detection mechanism; the controller is fixedly installed on the top of the support frame; the fixing mechanism is located in the support frame, and the detection mechanism is located at the bottom of the fixing mechanism;

[0007] The fixing mechanism includes a fixing plate, a dual-axis motor, a first gear and a plurality of second gears, wherein the fixing plate is fixed in the support frame, the dual-axis motor is vertically mounted on the fixing plate, the output end at the top of the dual-axis motor is fixedly connected to a rotating shaft, and one end of the rotating shaft away from the dual-axis motor is fixedly connected to the center of the first gear; each of the second gears is meshed with the first gear;

[0008] A rotating rod is fixedly connected to the center of the bottom surface of the second gear, and the rotating rod is rotatably inserted into the fixed plate, and the axial position of the rotating rod on the fixed plate is relatively fixed; the interior of the rotating rod is hollow, and a partition is slidably connected to the rotating rod, and the partition seals and divides the inner cavity of the rotating rod into an upper cavity and a lower cavity; a self-tapping cone rod is fixed to the side of the partition away from the second gear, and the end of the self-tapping cone rod away from the partition can slide out of the bottom surface of the rotating rod, and a limiting groove is provided on the inner wall of the rotating rod, and the inner wall of the limiting groove is slidably connected to a limiting slider, and the limiting slider is fixedly connected to the outer wall of the partition; a pressure assembly is connected to the rotating rod, and the pressure assembly is used to provide self-tapping pressure to the self-tapping cone rod.

[0009] Furthermore, the pressure assembly includes an air supply ring, an air pipe and an electromagnetic control valve. The air supply ring is sleeved on the outer circumference of the rotating rod. The side of the air supply ring close to the outer circumference of the rotating rod is opened and sealed to the outer circumference of the rotating rod. The air supply ring is located on the top wall of the fixed plate and is rotatably connected to the fixed plate. An air inlet hole is opened on the outer wall of the rotating rod corresponding to the position of the air supply ring. The air supply ring is connected to the upper cavity of the rotating rod through the air inlet hole. The electromagnetic control valve is installed on the air pipe. One end of the air pipe is connected to the air supply ring, and the other end is connected to the air supply device.

[0010] Furthermore, a wire withdrawal spring is provided in the lower cavity of the rotating rod, and the wire withdrawal spring is sleeved on the self-tapping cone rod. One end of the wire withdrawal spring abuts against the partition plate, and the other end abuts against the bottom surface of the lower cavity.

[0011] Furthermore, the detection mechanism includes a limit sleeve, a connecting plate and a screw rod, the limit sleeve is fixedly connected to the bottom surface of the fixed plate, the connecting plate is fixed to the end surface of the limit sleeve away from the fixed plate, the top of the connecting plate is rotatably connected to the screw rod through a bearing, the outer wall of the screw rod is threadedly connected with a threaded sleeve, the outer wall of the limit sleeve is provided with a limit groove, the outer wall of the threaded sleeve is fixedly connected to the limit plate, the limit plate is adapted to the limit groove, and the limit plate is slidably connected to the inner wall of the limit groove; the bottom end of the threaded sleeve is fixedly connected with a detection head, the output end of the bottom end of the dual-axis motor is connected with a telescopic docking assembly, and the dual-axis motor is connected or disconnected with the screw rod through the telescopic docking assembly.

[0012] Furthermore, the telescopic docking assembly includes a telescopic rod, a second connecting rod and a connecting slide rod; a slot is provided at the top of the screw rod, the telescopic rod is fixed to the output end of the bottom end of the dual-axis motor, an insert block adapted to the slot is fixed on the outer wall of the telescopic rod, one end of the second connecting rod is rotatably connected to the outer wall of the extension section of the telescopic rod, and the axial positions of the two are relatively fixed; the top of one end of the second connecting rod away from the telescopic rod is fixedly connected to the connecting slide rod, the outer wall of one end of the connecting slide rod away from the second connecting rod is rotatably connected to a limiting rotating rod, the top wall of the fixed plate is fixedly connected to a limiting block, a limiting groove is provided on the top of the limiting block, one end of the limiting rotating rod is clamped in the limiting groove, and the limiting rotating rod can produce elastic deformation.

[0013] The cam is connected with the support member by the spring, and the spring is connected with the support member to form a circle, and the circle is connected with the outer wall of the cam, and the circle is connected with the outer wall of the cam.

[0014] Furthermore, an elastic pad is bonded and fixed to the end surface of the pressing block away from the sliding rod, and the pressing block is pressed tightly against the inner wall of the well through the elastic pad.

[0015] Beneficial effects of the present invention:

[0016] The ultrasonic imaging logging device for coalbed methane detection of the present invention is provided with a fixing device, which uses a dual-axis motor to synchronously drive multiple self-tapping cone rods to rotate, and cooperates with a pressure component to achieve rapid fixing and detachment of the logging device from the ground, and is easy to operate; and a supporting mechanism is provided to improve the structural stability during the measurement process, thereby ensuring the accuracy of the measurement results. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 It is a partial exploded view used to embody the fixing mechanism in the present invention.

[0019] Figure 3 It is a partial structural diagram used to embody the fixing mechanism in the present invention.

[0020] Figure 4 It is a cross-sectional view used to embody the fixing mechanism in the present invention.

[0021] Figure 5 It is a partial cross-sectional view used to reflect the internal structure of the rotating rod in the present invention.

[0022] Figure 6 It is a partial structural diagram used to embody the detection mechanism in the present invention.

[0023] Figure 7 It is a partial structural diagram used to embody the telescopic docking assembly in the present invention.

[0024] Figure 8 It is a local structure used to embody the supporting mechanism in the present invention. Figure 1 .

[0025] Fig. 9 It is a local structure used to reflect the supporting structure in the present invention. Figure 2 .

[0026] In the figure: 1, support frame; 2, controller; 3, fixing mechanism; 31, fixing plate; 311, connecting hole; 32, dual-axis motor; 33, rotating shaft; 34, first gear; 35, second gear; 36, rotating rod; 361, limiting slide groove; 362, upper cavity; 363, lower cavity; 37, partition; 371, limiting slide block; 38, self-tapping cone rod; 381, wire withdrawal spring; 39, air supply ring; 4, detection mechanism; 41, limiting sleeve; 42 , connecting plate; 43, screw rod; 431, slot; 44, threaded sleeve; 45, detection head; 46, telescopic docking assembly; 461, telescopic rod; 462, plug block; 463, second connecting rod; 464, connecting slide rod; 465, limit rotating rod; 466, limit block; 47, limit plate; 5, supporting mechanism; 51, sliding sleeve; 52, fixed sleeve; 53, sliding rod; 54, pressure block; 55, reset spring; 56, elastic pad; 57, pressure strip. DETAILED DESCRIPTION

[0027] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0028] The invention discloses an ultrasonic imaging logging device for coal-bed methane detection.

[0029] Reference Figure 1 and Figure 2An ultrasonic imaging logging device for coalbed methane detection includes a support frame 1, a controller 2, a fixing mechanism 3 and a detection mechanism 4; wherein the controller 2 is fixedly mounted on the top of the support frame 1; the fixing mechanism 3 is located in the support frame 1, the detection mechanism 4 is located at the bottom of the fixing mechanism 3, and support mechanisms 5 are provided on both sides of the detection mechanism 4. The ultrasonic imaging logging device can be quickly and conveniently fixed to the wellhead through the fixing mechanism 3, the detection mechanism 4 is used to realize the detection of the coal gas layer, and the support mechanism 5 is used to enhance the structural stability of the detection mechanism 4.

[0030] Reference Figure 2 and Figure 3 The fixing mechanism 3 includes a fixing plate 31, a dual-axis motor 32, a first gear 34 and a plurality of second gears 35. The fixing plate 31 is welded and fixed to the inner wall of the support frame 1. A through hole is provided on the fixing plate 31. The dual-axis motor 32 is vertically fixedly connected to the inner wall of the through hole. The output end at the top of the dual-axis motor 32 is fixedly connected to a rotating shaft 33. One end of the rotating shaft 33 away from the dual-axis motor 32 is fixedly connected to the center of the first gear 34. The second gear 35 meshes with the first gear 34. In this embodiment, the number of the second gears 35 is set to four, and two second gears 35 form a pair and are symmetrically distributed on both sides of the fixing plate 31.

[0031] Reference Figures 3 to 5 The center of the bottom surface of the second gear 35 is fixedly connected with a rotating rod 36. The fixed plate 31 is provided with a connecting hole 311 for the rotating rod 36 to pass through. The rotating rod 36 is rotatably passed through the connecting hole 311. The axial position of the rotating rod 36 on the fixed plate 31 is relatively fixed. The rotating rod 36 is hollow inside, and a partition 37 is slidably connected inside the rotating rod 36. The partition 37 seals and separates the inner cavity of the rotating rod 36 into an upper cavity 362 and a lower cavity 363. A self-tapping cone rod 38 is fixed at the center of the side wall of the partition 37 away from the second gear 35. One end of the self-tapping cone rod 38 away from the partition 37 can slide out of the bottom surface of the rotating rod 36. A limited sliding groove 361 is provided on the inner wall of the rotating rod 36. A limited sliding block 371 is slidably connected to the inner wall of the limited sliding groove 361. The limited sliding block 371 is fixedly connected to the outer wall of the partition 37. A pressure assembly is connected to the rotating rod 36. The pressure assembly is used to provide self-tapping pressure to the self-tapping cone rod 38.

[0032] When the ultrasonic imaging logging device is in use, the support frame 1 is placed above the wellhead, and then the fixed plate 31 is erected above the wellhead; the dual-axis motor 32 is started, and the top output end of the dual-axis motor 32 drives the rotating shaft 33 to rotate, and then the rotating shaft 33 drives the first gear 34 to rotate; and the second gear 35 is engaged with the first gear 34, which drives the second gear 35 to rotate, and the second gear 35 drives the corresponding rotating rod 36 to rotate, and the rotating rod 36 drives the partition 37 to rotate synchronously through the limiting action of the limiting slider 371 and the limiting groove 361, and then the partition 37 drives the self-tapping cone rod 38 to rotate. While the self-tapping cone rod 38 is rotating, the pressure component provides downward pressure on the self-tapping cone rod 38, so that the self-tapping cone rod 38 is screwed into the ground, thereby completing the fixation of the logging device at the wellhead.

[0033] Reference Figures 3 to 5 The pressure assembly includes an air supply ring 39, an air pipe and an electromagnetic control valve. The air supply ring 39 is sleeved on the outer circumference of the rotating rod 36. The air supply ring 39 is opened on one side close to the outer circumference of the rotating rod 36 and is sealed with the outer circumference of the rotating rod 36. The air supply ring 39 is located on the top wall of the fixed plate 31 and is rotatably connected to the fixed plate 31. An air inlet hole is opened on the outer wall of the rotating rod 36 corresponding to the position of the air supply ring 39. The air supply ring 39 is connected to the upper cavity 362 of the rotating rod 36 through the air inlet hole. The electromagnetic control valve is installed on the air pipe. One end of the air pipe is connected to the air supply ring 39, and the other end is connected to the air supply device. In this embodiment, the air supply device is an air compressor. When the dual-axis motor 32 drives the automatic cone rod to rotate through a series of transmissions, the electromagnetic control valve opens, and the air supply device introduces high-pressure gas into the air supply ring 39 through the air pipe. The high-pressure gas enters the upper cavity 362 of the rotating rod 36 through the air inlet hole, so that the air pressure applies self-tapping pressure to the self-tapping cone rod 38 through the partition 37.

[0034] A wire withdrawal spring 381 is provided in the lower cavity 363 of the rotating rod 36. The wire withdrawal spring 381 is sleeved on the self-tapping cone rod 38. One end of the wire withdrawal spring 381 abuts against the partition 37, and the other end abuts against the bottom surface of the lower cavity 363 of the rotating rod 36. When disassembly is required, it is only necessary to open the electromagnetic control valve to relieve the high-pressure gas in the upper cavity 362, and then start the dual-axis motor 32 to reverse it. Then, the self-tapping cone rod 38 can be smoothly detached from the bottom surface under the action of the spiral guide and the tension of the wire withdrawal spring 381. Compared with the existing bolt fixing method, there is no need to disassemble and assemble the bolts one by one, which reduces the labor intensity of the staff and improves the convenience of disassembly and assembly.

[0035] Reference Figure 6 and Figure 7The detection mechanism 4 includes a limit sleeve 41, a connecting plate 42 and a screw 43. The limit sleeve 41 is fixedly connected to the bottom surface of the fixed plate 31, the connecting plate 42 is fixed to the end surface of the limit sleeve 41 away from the fixed plate 31, the top of the connecting plate 42 is rotatably connected to the screw 43 through a bearing, the outer wall of the screw 43 is threadedly connected with a threaded sleeve 44, the outer wall of the limit sleeve 41 is provided with a limit slot, the outer wall of the threaded sleeve 44 is fixedly connected with a limit plate 47, the limit plate 47 is adapted to the limit slot, and the limit plate 47 is slidably connected to the inner wall of the limit slot. The limit slot plays a role in limiting the movement of the threaded sleeve 44, and the limit slot fits the outer wall of the limit plate 47 to ensure the stability of the threaded sleeve 44 during movement. The bottom end of the threaded sleeve 44 is fixedly connected with a detection head 45, and the output end of the bottom end of the dual-axis motor 32 is connected with a telescopic docking assembly 46, and the dual-axis motor 32 is connected or disconnected with the screw 43 through the telescopic docking assembly 46.

[0036] Reference Figure 7 The telescopic docking assembly 46 includes a telescopic rod 461, a second connecting rod 463 and a connecting slide rod 464; a slot 431 is provided at the top of the screw rod 43, and the output end at the bottom of the dual-axis motor 32 is fixedly connected to the telescopic rod 461. An insert block 462 is fixedly connected to the outer wall of the telescopic rod 461. The insert block 462 is adapted to the slot 431 on the screw rod 43, and the insert block 462 can be snapped into the slot 431. One end of the second connecting rod 463 is rotatably connected to the outer wall of the extension section of the telescopic rod 461, and the axial positions of the two are relatively fixed; the top of the end of the second connecting rod 463 away from the telescopic rod 461 is fixedly connected to the connecting slide rod 464, and the outer wall of the end of the connecting slide rod 464 away from the second connecting rod 463 is rotatably connected to a limited rotation rod 465, and the top wall of the fixed plate 31 is fixedly connected to a limited block 466. The material of the limited rotation rod 465 is plastic and can produce elastic deformation. The top of the limit block 466 is provided with a limit groove adapted to the limit rotating rod 465, and the outer wall of the limit rotating rod 465 is clamped on the inner wall of the limit groove. Since the limit rotating rod 465 is made of plastic, the limit rotating rod 465 can be deformed by moving it upward, so that the limit rotating rod 465 is separated from the limit groove at the top of the limit block 466, thereby releasing the limit relationship.

[0037] Reference Figure 8 and Fig. 9The support mechanism 5 includes a sliding sleeve 51, a fixed sleeve 52, a sliding rod 53 and a pressing block 54; the sliding sleeve 51 is fixed to the outer wall of the bottom end of the limiting sleeve 41 and is in communication with the limiting sleeve 41; the fixed sleeve 52 is fixed to the inner wall of the sliding sleeve 51; the sliding rod 53 is inserted into the fixing sleeve 52 and is slidably connected to the fixing sleeve 52; and the end of the sliding rod 53 away from the limiting sleeve 41 is fixedly connected to the pressing block 54. A return spring 55 is sleeved on the sliding rod 53, one end of the return spring 55 is fixedly connected to the pressing block 54, and the other end of the return spring 55 is fixedly connected to the end surface of the fixing sleeve 52 away from the sliding sleeve 51. A pressure strip 57 is provided at one end of the sliding rod 53 away from the pressing block 54, and the pressure strip 57 is fixedly connected to the outer wall of the threaded sleeve 44. In this embodiment, two groups of support mechanisms 5 are provided, and the two groups of support mechanisms 5 are symmetrically arranged on both sides of the bottom end of the limiting sleeve 41, and then can simultaneously support, abut and stabilize both sides of the threaded sleeve 44, thereby ensuring the stability of the detection head 45 during the downward detection process.

[0038] Reference Figure 8 and Fig. 9 , the top side edge of one end of the slide bar 53 away from the pressure block 54 is provided with an inclined surface, and the outer wall of the slide bar 53 fits in with the inner wall of the fixed sleeve 52. During the downward movement of the threaded sleeve 44, the pressure strip 57 is driven to contact the inclined surface of the slide bar 53, thereby pushing the pressure block 54 to contact the inner wall of the well, achieving a stabilizing effect on the limiting sleeve 41. In order to ensure the tight and fixed effect of the pressure block 54, an elastic pad 56 made of rubber material is bonded and fixed to the end surface of the pressure block 54 away from the slide bar 53. The pressure block 54 is pressed against the inner wall of the well through the elastic pad 56. The elastic tight force effect is more stable and reliable, avoiding the error influence of rigid contact, and ensuring the stabilizing effect of the support mechanism 5. In some embodiments, the pressure block 54 can also be made into a retractable rod body, so that it can be suitable for wells with different inner diameters.

[0039] The working principle of an ultrasonic imaging logging device for coalbed methane detection of the present invention is as follows: a support frame 1 is placed above a wellhead, and then a fixed plate 31 is erected above the wellhead; a dual-axis motor 32 is started, and the top output end of the dual-axis motor 32 drives the rotating shaft 33 to rotate, and then the rotating shaft 33 drives the first gear 34 to rotate; and the second gear 35 is meshed with the first gear 34, which drives the second gear 35 to rotate, and the second gear 35 drives the corresponding rotating rod 36 to rotate, and the rotating rod 36 drives the partition 37 to rotate through the limiting slider 371 and the limiting slide groove 361, and then the partition 37 drives the self-tapping cone rod 38 to rotate, and while the self-tapping cone rod 38 is rotating, the air supply device introduces high-pressure gas into the air supply ring 39 through the air pipe, and the high-pressure gas enters the upper cavity 362 of the rotating rod 36 through the air inlet hole, so that the air pressure applies self-tapping pressure to the self-tapping cone rod 38 through the partition 37, so that the self-tapping cone rod 38 is screwed into the ground, thereby completing the fixing of the logging device at the wellhead. When disassembly is required, the dual-axis motor 32 only needs to be started to reverse and the upper cavity 362 is depressurized, and the self-tapping cone rod 38 can be smoothly separated from the bottom surface under the action of the spiral guide and the elastic force of the wire withdrawal spring 381. Compared with the existing bolt fixing method, there is no need to disassemble and install the bolts one by one, which reduces the labor intensity of the staff and improves the convenience of fixed installation.

[0040] When it is necessary to drive the detection head 45 to move downward, push the limit rotating rod 465 upward to deform it and disengage it from the limit groove on the limit block 466, then rotate the limit rotating rod to disengage it from the top of the limit block 466, and then move the connecting slide rod 464 downward, and drive the telescopic rod 461 to extend downward through the second connecting rod 463, so that the insert block 462 is inserted into the slot 431 at the top of the screw rod 43, thereby realizing the connection between the dual-axis motor 32 and the screw rod 43.

[0041] Then the dual-axis motor 32 is started, and the output end at the bottom thereof drives the screw rod 43 to rotate through the telescopic rod 461. The rotation of the screw rod 43 drives the threaded sleeve 44 to move downward, and then drives the detection head 45 at the bottom of the threaded sleeve 44 to move downward, and the well can be detected through the detection head 45.

[0042] When the threaded sleeve 44 moves downward, the threaded sleeve 44 drives the pressure strip 57 to move downward. The pressure strip 57 abuts against the slide bar 53 during the downward movement, and squeezes and drives the slide bar 53 to move away from the threaded sleeve 44. Then the slide bar 53 drives the pressure block 54 to move outward and abuts against the inner wall of the wellbore, thereby achieving the supporting and fixing effect on the limit sleeve 41.

[0043] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An ultrasonic imaging logging device for coalbed methane detection, characterized in that: The device comprises a support frame (1), a controller (2), a fixing mechanism (3) and a detection mechanism (4); the controller (2) is fixedly mounted on the top of the support frame (1); the fixing mechanism (3) is located inside the support frame (1), and the detection mechanism (4) is located at the bottom of the fixing mechanism (3); The fixing mechanism (3) comprises a fixing plate (31), a dual-axis motor (32), a first gear (34) and a plurality of second gears (35); the fixing plate (31) is fixed in the support frame (1); the dual-axis motor (32) is vertically mounted on the fixing plate (31); the output end at the top of the dual-axis motor (32) is fixedly connected to a rotating shaft (33); an end of the rotating shaft (33) away from the dual-axis motor (32) is fixedly connected to the center of the first gear (34); each of the second gears (35) is meshed with the first gear (34); A rotating rod (36) is fixedly connected to the center of the bottom surface of the second gear (35), and the rotating rod (36) is rotatably inserted into the fixed plate (31), and the axial position of the rotating rod (36) on the fixed plate (31) is relatively fixed; the rotating rod (36) is hollow inside, and a partition (37) is slidably connected inside the rotating rod (36), and the partition (37) seals and separates the inner cavity of the rotating rod (36) into an upper cavity (362) and a lower cavity (363); the partition (37) is away from the second gear (3 5) A self-tapping cone rod (38) is fixed on one side, and the end of the self-tapping cone rod (38) away from the partition (37) can slide out of the bottom surface of the rotating rod (36), and the inner wall of the rotating rod (36) is provided with a limiting slide groove (361), and the inner wall of the limiting slide groove (361) is slidably connected to a limiting slider (371), and the limiting slider (371) is fixedly connected to the outer wall of the partition (37); a pressure component is connected to the rotating rod (36), and the pressure component is used to provide self-tapping pressure to the self-tapping cone rod (38).

2. The ultrasonic imaging logging device for coalbed methane detection according to claim 1, characterized in that: The pressure assembly comprises an air supply ring (39), an air pipe and an electromagnetic control valve. The air supply ring (39) is sleeved on the outer peripheral surface of the rotating rod (36). The air supply ring (39) is opened on one side close to the outer peripheral surface of the rotating rod (36) and is sealed with the outer peripheral surface of the rotating rod (36). The air supply ring (39) is located on the top wall of the fixed plate (31) and is rotatably connected to the fixed plate (31). An air inlet hole is opened on the outer wall of the rotating rod (36) at a position corresponding to the air supply ring (39). The air supply ring (39) is connected to the upper cavity (362) of the rotating rod (36) through the air inlet hole. The electromagnetic control valve is installed on the air pipe. One end of the air pipe is connected to the air supply ring (39), and the other end is connected to the air supply device.

3. The ultrasonic imaging logging device for coalbed methane detection according to claim 2, characterized in that: A wire withdrawal spring (381) is provided in the lower cavity (363) of the rotating rod (36). The wire withdrawal spring (381) is sleeved on the self-tapping cone rod (38). One end of the wire withdrawal spring (381) abuts against the partition plate (37), and the other end abuts against the bottom surface of the lower cavity (363).

4. The ultrasonic imaging logging device for coalbed methane detection according to claim 2 or 3, characterized in that: The detection mechanism (4) comprises a limiting sleeve (41), a connecting plate (42) and a screw rod (43); the limiting sleeve (41) is fixedly connected to the bottom surface of the fixing plate (31); the connecting plate (42) is fixed to the end surface of the limiting sleeve (41) away from the fixing plate (31); the top end of the connecting plate (42) is rotatably connected to the screw rod (43) via a bearing; the outer wall of the screw rod (43) is threadedly connected with a threaded sleeve (44); the outer wall of the limiting sleeve (41) is opened A limit slot is provided, the outer wall of the threaded sleeve (44) is fixedly connected to a limit plate (47), the limit plate (47) is adapted to the limit slot, and the limit plate (47) is slidably connected to the inner wall of the limit slot; the bottom end of the threaded sleeve (44) is fixedly connected to a detection head (45), the output end of the bottom end of the dual-axis motor (32) is connected to a telescopic docking assembly (46), and the dual-axis motor (32) is connected to or disconnected from the screw rod (43) through the telescopic docking assembly (46).

5. The ultrasonic imaging logging device for coalbed methane detection according to claim 4, characterized in that: The telescopic docking assembly (46) comprises a telescopic rod (461), a second connecting rod (463) and a connecting sliding rod (464); a slot (431) is provided at the top of the screw rod (43); the telescopic rod (461) is fixed to the output end of the bottom end of the dual-axis motor (32); an insert (462) adapted to the slot (431) is fixed to the outer wall of the telescopic rod (461); one end of the second connecting rod (463) is rotatably connected to the outer wall of the extension section of the telescopic rod (461), and the axial positions of the two are relatively fixed. The top of one end of the second connecting rod (463) away from the telescopic rod (461) is fixedly connected to the connecting slide rod (464), and the outer wall of one end of the connecting slide rod (464) away from the second connecting rod (463) is rotatably connected to the limiting rotating rod (465), and the top wall of the fixed plate (31) is fixedly connected to the limiting block (466), and a limiting groove is provided at the top of the limiting block (466), and one end of the limiting rotating rod (465) is clamped in the limiting groove, and the limiting rotating rod (465) can produce elastic deformation.

6. The ultrasonic imaging logging device for coalbed methane detection according to claim 4, characterized in that: The support mechanism (5) is provided with two groups, and the two groups of support mechanisms (5) are symmetrically arranged on both sides of the bottom end of the limiting sleeve (41). The support mechanism (5) comprises a sliding sleeve (51), a fixing sleeve (52), a sliding rod (53) and a pressing block (54); the sliding sleeve (51) is fixed to the outer wall of the bottom end of the limiting sleeve (41) and is communicated with the limiting sleeve (41); the fixing sleeve (52) is fixed to the inner wall of the sliding sleeve (51); the sliding rod (53) is inserted into the fixing sleeve (52) and is slidably connected to the fixing sleeve (52); the end of the sliding rod (53) away from the limiting sleeve (41) is connected to the pressing block (54). fixedly connected; a return spring (55) is sleeved on the slide rod (53), one end of the return spring (55) is fixedly connected to the pressure block (54), and the other end of the return spring (55) is fixedly connected to the end surface of the fixed sleeve (52) away from the slide sleeve (51); a pressure strip (57) is provided at one end of the slide rod (53) away from the pressure block (54), and the pressure strip (57) is fixedly connected to the outer wall of the threaded sleeve (44); an inclined surface is provided on the top side edge of one end of the slide rod (53) away from the pressure block (54), and the outer wall of the slide rod (53) fits closely with the inner wall of the fixed sleeve (52).

7. The ultrasonic imaging logging device for coalbed methane detection according to claim 6, characterized in that: An elastic pad (56) is bonded and fixed to the end surface of the pressing block (54) away from the sliding rod (53), and the pressing block (54) is pressed tightly against the inner wall of the well via the elastic pad (56).

Images