Device for testing traction capability of underground crawler on ground

Abstract

The invention provides a device for testing the traction capability of an underground crawler on the ground. The device comprises a test frame, a transmission case assembly, a magnetic powder brake and a tension controller, the testing frame comprises a main frame and two holding mechanisms, and the two holding mechanisms are connected to the two ends of the main frame in the length direction respectively and used for holding the underground crawler; the transmission box assembly comprises a gear box, two first connecting plates, two second connecting plates, a fixing plate, a driving load shaft, two driven output shafts, two measuring wheels and a gear assembly. The magnetic powder brake is connected with the driving load shaft; the tension controller is in electric signal connection with the magnetic powder brake. The first connecting plate and the second connecting plate can be fixedly connected with the gearbox at a plurality of different mounting positions, so that the distance between the two driven output shafts is adjusted, casing pipes with different diameters are simulated, the traction capacity of the underground crawler in the casing pipes with different specifications can be visually tested, time and labor are saved, and meanwhile the testing cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of downhole crawler testing devices, and in particular to a testing device for the ground traction capability of a downhole crawler. Background Art

[0002] During the oil drilling process, some logging instruments need to be sent to the measuring section. Since the measuring section is mostly horizontal wells, the logging instruments are lowered by cables and there is no deadweight to send the logging instruments to the measuring section, so a downhole crawler is needed. The traction capacity of the crawler needs to be tested on the ground to see if it meets the traction requirements of the logging instruments.

[0003] In the prior art, a device for testing the traction ability of a downhole crawler on the ground places the downhole crawler inside a casing to detect the crawling effect. This process requires matching casings of different specifications. At the same time, the downhole crawler needs to be taken out and re-installed into the casing after each test, which is time-consuming, labor-intensive and costly. The crawling effect of the downhole crawler cannot be seen inside the casing, and the measurement effect of the traction ability cannot be visually detected. Summary of the invention

[0004] In view of this, the present invention proposes a testing device for the traction ability of a downhole crawler on the ground to solve the problem proposed in the above-mentioned background technology that casings of different specifications need to be matched, and the crawler needs to be taken out and re-installed into the casing after each test, which is time-consuming, labor-intensive and costly. In addition, the crawling effect of the downhole crawler cannot be seen inside the casing, and the crawling ability cannot be visually observed.

[0005] The technical solution of the present invention is achieved in this way:

[0006] The present invention provides a testing device for the traction ability of a downhole crawler on the ground, comprising a testing frame, a transmission box assembly, a magnetic powder brake and a tension controller, wherein:

[0007] The test frame includes a main frame and two clamping mechanisms, wherein the two clamping mechanisms are respectively connected to both ends of the main frame in the length direction and are used to clamp the downhole crawler;

[0008] The transmission box assembly includes a gear box, two first connecting plates, two second connecting plates, a fixed plate, an active load shaft, two driven output shafts, two measuring wheels and a gear assembly; the two first connecting plates and the two second connecting plates are rotatably mounted on the gear box; the fixed plate is respectively connected to the gear box and the main frame; the active load shaft is rotatably mounted on the fixed plate; the two driven output shafts are respectively rotatably mounted on the first connecting plate and the second connecting plate, and the first connecting plate and the second connecting plate can be connected and fixed to the gear box at multiple different mounting positions to adjust the spacing between the two driven output shafts; the two measuring wheels are respectively mounted on the two driven output shafts for contacting the crawler wheels of the downhole crawler; so the gear assembly is respectively connected to the active load shaft and the two driven output shafts;

[0009] The magnetic powder brake is connected to the active load shaft;

[0010] The tension controller is connected to the magnetic powder brake by electrical signals and is used to control the current value of the exciting current of the magnetic powder brake.

[0011] On the basis of the above technical solution, preferably, the transmission box assembly also includes a first rotating shaft and a second rotating shaft, and the first rotating shaft and the second rotating shaft are symmetrically fixed on the gear box with the length direction of the main frame as the symmetry axis; two first connecting plates are rotatably installed on the first rotating shaft; and two second connecting plates are rotatably installed on the second rotating shaft.

[0012] On the basis of the above technical solution, preferably, the gear box is symmetrically provided with a plurality of first mounting holes and a plurality of second mounting holes; the first connecting plate is provided with a first connecting hole matching the first mounting hole, and the second connecting plate is provided with a second connecting hole matching the second mounting hole;

[0013] The transmission box assembly also includes a first connecting pin and a second connecting pin, wherein the first connecting pin is used to connect the first mounting hole and the first connecting hole, and the second connecting pin is used to connect the second mounting hole and the second connecting hole.

[0014] On the basis of the above technical solution, preferably, the plurality of first mounting holes are distributed on a circle with the first rotating axis as the center, and the plurality of second mounting holes are distributed on a circle with the second rotating axis as the center.

[0015] On the basis of the above technical scheme, preferably, the clamping mechanism includes a static valve, a dynamic valve, a hinge pin, a mounting pin, a pull rod screw and a connecting nut; the static valve is fixedly installed at one end of the main frame in the length direction, and the static valve is provided with an ear seat; the dynamic valve and the static valve are hingedly connected by the hinge pin to embrace the downhole crawler; both ends of the mounting pin are installed in the ear seat, the pull rod screw is sleeved on the mounting pin, and the connecting nut is threadedly connected to the pull rod screw and can abut against the outer surface of the dynamic valve.

[0016] On the basis of the above technical solution, preferably, the clamping mechanism also includes a retaining ring, a limiting boss is provided at one end of the hinge pin, and an annular groove is provided at the other end, the limiting boss is used to interfere with the end face of the static valve, the annular groove is located outside the static valve, and the retaining ring is installed in the annular groove.

[0017] On the basis of the above technical solution, preferably, the inner side wall of the dynamic valve and the inner side wall of the static valve are provided with a buffer pad.

[0018] On the basis of the above technical solution, preferably, the gear box comprises a box body and a box cover, the box cover is detachably connected to the box body, and the gear assembly is arranged in the box body.

[0019] On the basis of the above technical solution, preferably, the gear assembly includes a driving gear, a driven gear and a plurality of transmission gears, the driving gear is mounted on the active load shaft, the driven gear is mounted on the driven output shaft, and the plurality of transmission gears are rotatably mounted on the housing, and are in transmission engagement between the driving gear and the driven gear.

[0020] On the basis of the above technical solution, preferably, when the measuring wheel contacts the crawler wheel of the downhole crawler, the radial direction of the measuring wheel is parallel to the crawler wheel.

[0021] Compared with the prior art, the testing device for the traction ability of the underground crawler on the ground of the present invention has the following advantages:

[0022] Beneficial effects:

[0023] (1) The two measuring wheels are respectively installed on the two driven output shafts to contact the crawler wheels of the downhole crawler. The first connecting plate and the second connecting plate can be connected and fixed to the gear box at multiple different installation positions to adjust the spacing between the two driven output shafts to simulate casings of different diameters. The traction capacity of the downhole crawler in casings of different specifications can be visually tested, which saves time and effort while reducing the testing cost. The load of the magnetic powder brake is transmitted to the measuring wheel through the gear assembly, and the current value of the exciting current of the magnetic powder brake is controlled by the tension controller to achieve adjustable load size, thereby measuring the traction capacity of the downhole crawler. The measuring method is simple, reliable and efficient.

[0024] (2) The first connecting plates are rotatably mounted on the first rotating shaft through two first connecting plates; the second connecting plates are rotatably mounted on the second rotating shaft, so that the first connecting plates and the second connecting plates can be rotatably mounted on the gear box. The first rotating shaft and the second rotating shaft are symmetrically fixed on the gear box with the length direction of the main frame as the symmetry axis. When switching to different installation positions, it is only necessary for the first connecting plate and the second connecting plate to rotate at the same angle to ensure that the two test wheels are always symmetrical about the crawler wheel. There is no need to repeatedly align the downhole crawler, and the position of the downhole crawler will not change, which can also improve the accuracy of the test;

[0025] (3) The first connecting pin is used to connect the first mounting hole and the first connecting hole to realize the detachable connection between the first connecting plate and the gear box, and the second connecting pin is used to connect the second mounting hole and the second connecting hole to realize the detachable connection between the second connecting plate and the gear box, thereby facilitating the adjustment of the mounting positions of the first connecting plate and the second connecting plate and the gear box, making the test device more convenient and quick to assemble, thereby improving the test efficiency;

[0026] (4) The movable valve and the static valve are hingedly connected through the hinge pin to embrace the downhole crawler; both ends of the mounting pin are mounted in the ear seat, the pull rod screw is sleeved on the mounting pin, the connecting nut is threadedly connected with the pull rod screw and can abut against the outer surface of the movable valve, after the movable valve and the static valve are embraced on the downhole crawler, the movable valve and the static valve are locked by tightening the connecting nut and the pull rod screw, thereby embracing the downhole crawler;

[0027] (5) A limiting boss is provided at one end of the hinge pin, and an annular groove is provided at the other end. The limiting boss abuts against the end face of the static valve, and the annular groove is located outside the static valve. The retaining ring is installed in the annular groove. The two ends of the hinge pin are limited by the limiting boss and the retaining ring to prevent the hinge pin from slipping out of the static valve and the dynamic valve, thereby improving the reliability and stability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a schematic structural diagram of a device for testing the traction ability of a downhole crawler on the ground in an embodiment of the present invention;

[0030] Figure 2 It is a principle schematic diagram of a transmission box assembly in an embodiment of the present invention;

[0031] Figure 3 is a schematic structural diagram of a test stand in an embodiment of the present invention;

[0032] Figure 4 is a side view of a transmission box assembly in an embodiment of the present invention;

[0033] Figure 5 It is a front view of a transmission box assembly in an embodiment of the present invention;

[0034] Figure 6 It is a rear view of the transmission box assembly in the embodiment of the present invention.

[0035] Description of reference numerals: 1-test frame, 2-transmission box assembly, 3-magnetic powder brake, 4-tension controller;

[0036] 100- Downhole crawler;

[0037] 11-main frame, 12-clamping mechanism, 121-static valve, 1211-ear seat, 122-dynamic valve, 123-hinge pin, 1231-limiting boss, 1232-annular groove, 124-mounting pin, 125-pull rod screw, 126-connecting nut, 127-retaining ring;

[0038] 21-gear box, 2101-box body, 2102-box cover, 211-first mounting hole, 212-second mounting hole, 22-first connecting plate, 221-first connecting hole, 23-second connecting plate, 231-second connecting hole, 24-fixing plate, 25-active load shaft, 26-driven output shaft, 27-measuring wheel, 28-gear assembly, 281-active gear, 282-driven gear, 283-transmission gear, 29-first rotating shaft, 210-second rotating shaft, 220-first connecting pin, 230-second connecting pin, 240-first driven shaft, 250-second driven shaft. DETAILED DESCRIPTION

[0039] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Reference Figure 1-6 As shown, an embodiment of the present invention provides a test device for the traction ability of a downhole crawler on the ground, comprising a test frame 1, a transmission box assembly 2, a magnetic powder brake 3 and a tension controller 4, wherein:

[0041] The test frame 1 includes a main frame 11 and two clamping mechanisms 12, and the two clamping mechanisms 12 are respectively connected to the two ends of the main frame 11 in the length direction, and are used to clamp the downhole crawler 100;

[0042] The transmission box assembly 2 includes a gear box 21, two first connecting plates 22, two second connecting plates 23, a fixed plate 24, an active load shaft 25, two driven output shafts 26, two measuring wheels 27 and a gear assembly 28; the two first connecting plates 22 and the two second connecting plates 23 are rotatably mounted on the gear box 21; the fixed plate 24 is connected to the gear box 21 and the main frame 11 respectively; the active load shaft 25 is rotatably mounted on the fixed plate 24; the two driven output shafts 26 are rotatably mounted on the first connecting plate 22 and the second connecting plate 23 respectively, and the first connecting plate 22 and the second connecting plate 23 can be connected and fixed to the gear box 21 at multiple different mounting positions to adjust the spacing between the two driven output shafts 26; the two measuring wheels 27 are respectively mounted on the two driven output shafts 26 for contacting the crawling wheels of the downhole crawler 100; so the gear assembly 28 is respectively connected to the active load shaft 25 and the two driven output shafts 26;

[0043] The magnetic powder brake 3 is connected to the active load shaft 25;

[0044] The tension controller 4 is connected to the magnetic powder brake 3 by electrical signals, and is used to control the current value of the exciting current of the magnetic powder brake 3. The tension controller 4 can adjust the braking force of the magnetic powder brake 3 by controlling the current value of the exciting current of the magnetic powder brake 3, thereby adjusting the load applied to the test wheel.

[0045] The test device for the traction capacity of the downhole crawler on the ground proposed in this embodiment is respectively installed on the two driven output shafts 26 through the two measuring wheels 27, which are used to contact the crawler wheels of the downhole crawler 100. The first connecting plate 22 and the second connecting plate 23 can be connected and fixed to the gear box 21 at multiple different installation positions to adjust the spacing between the two driven output shafts 26 to simulate casings of different diameters. The traction capacity of the downhole crawler 100 in casings of different specifications can be visually tested, which saves time and effort while reducing the testing cost; the load of the magnetic powder brake 3 is transmitted to the measuring wheel 27 through the gear assembly 28, and the current value of the excitation current of the magnetic powder brake 3 is controlled by the tension controller 4 to achieve adjustable load size, thereby measuring the traction capacity of the downhole crawler 100. The measuring method is simple, reliable and efficient.

[0046] In some embodiments, the transmission box assembly 2 further includes a first rotating shaft 29 and a second rotating shaft 210, the first rotating shaft 29 and the second rotating shaft 210 are symmetrically fixed to the gear box 21 with the length direction of the main frame 11 as the symmetry axis; two first connecting plates 22 are rotatably mounted on the first rotating shaft 29 and are respectively located on both sides of the gear box 21; two second connecting plates 23 are rotatably mounted on the second rotating shaft 210 and are respectively located on both sides of the gear box 21, and the second connecting plates 23 and the first connecting plates 22 do not interfere with each other during rotation. By symmetrically fixing the first rotating shaft 29 and the second rotating shaft 210 to the gear box 21 with the length direction of the main frame 11 as the symmetry axis, when switching different installation positions, it is only necessary for the first connecting plate 22 and the second connecting plate 23 to rotate at the same angle, so that the two test wheels are always symmetrical about the crawler wheel, and there is no need to repeatedly align the downhole crawler 100, the position of the downhole crawler 100 will not change, and the accuracy of the test can also be improved.

[0047] In some embodiments, the gear box 21 is symmetrically provided with a plurality of first mounting holes 211 and a plurality of second mounting holes 212; the first connecting plate 22 is provided with a first connecting hole 221 matching the first mounting hole 211, and the second connecting plate 23 is provided with a second connecting hole 231 matching the second mounting hole 212; the transmission box assembly 2 further includes a first connecting pin 220 and a second connecting pin 230, the first connecting pin 220 is used to connect the first mounting hole 211 and the first connecting hole 221, and the second connecting pin 230 is used to connect the second mounting hole 212 and the second connecting hole 231. Figure 5As shown, there are four first mounting holes 211 and four second mounting holes 212, corresponding to four different specifications of sleeves (4.5", 5.5", 7" and 8 5 / 8", in total). The actual number of first mounting holes 211 and second mounting holes 212 can be set accordingly according to the type of specifications of the sleeves to be simulated. The first connecting pin 220 connects the first mounting hole 211 and the first connecting hole 221 to achieve a detachable connection between the first connecting plate 22 and the gear box 21. The second connecting pin 230 connects the second mounting hole 212 and the second connecting hole 231 to achieve a detachable connection between the second connecting plate 23 and the gear box 21, thereby facilitating the adjustment of the mounting positions of the first connecting plate 22 and the second connecting plate 23 and the gear box 21, making it more convenient and quick to assemble the test device, thereby improving the test efficiency.

[0048] In some embodiments, a plurality of the first mounting holes 211 are distributed on a circle with the first rotating shaft 29 as the center, and a plurality of the second mounting holes 212 are distributed on a circle with the second rotating shaft 210 as the center. By arranging a plurality of the first mounting holes 211 around the first rotating shaft 29 as the center, and arranging a plurality of the second mounting holes 212 around the second rotating shaft 210 as the center, when the first connecting plate 22 and the second connecting plate 23 rotate, the first connecting hole 221 will always be aligned with one of the first mounting holes 211, and the second connecting hole 231 will always be aligned with one of the second mounting holes 212, thereby improving the reliability of the device, and by setting the spacing between two adjacent first mounting holes 211 and the spacing between two adjacent second mounting holes 212, it can correspond to round tubes of different specifications.

[0049] In some embodiments, the clamping mechanism 12 includes a static valve 121, a dynamic valve 122, a hinge pin 123, a mounting pin 124, a pull rod screw 125 and a connecting nut 126; the static valve 121 is fixedly installed at one end of the main frame 11 in the length direction, and an ear seat 1211 is provided on the static valve 121; the dynamic valve 122 and the static valve 121 are hingedly connected to the hinge pin 123 to embrace the downhole crawler 100; both ends of the mounting pin 124 are installed in the ear seat, the pull rod screw 125 is sleeved on the mounting pin 124, and the connecting nut 126 is threadedly connected to the pull rod screw 125, and can abut against the outer surface of the dynamic valve 122. After the movable valve 122 and the static valve 121 are encircled on the downhole crawler 100, the movable valve 122 and the static valve 121 are locked by fastening the connecting nut 126 and the pull rod screw 125, thereby tightly holding the downhole crawler 100. The holding structure is easy to assemble and has good holding ability. The connecting nut 126 can be a butterfly nut, which is convenient for applying torque. The connecting nut 126 can be rotated manually without tools, which is more convenient to operate.

[0050] In some embodiments, the clamping mechanism 12 further includes a retaining ring 127, a limiting boss 1231 is provided at one end of the hinge pin 123, and an annular groove 1232 is provided at the other end, the limiting boss 1231 is used to abut against the end surface of the static valve 121, the annular groove 1232 is located outside the static valve 121, and the retaining ring 127 is installed in the annular groove 1232. The limiting boss 1231 and the retaining ring 127 are used to limit the two ends of the hinge pin 123, so as to prevent the hinge pin 123 from slipping out of the static valve 121 and the dynamic valve 122, thereby improving the reliability and stability of the device.

[0051] In some embodiments, a buffer pad is provided on the inner wall of the movable valve 122 and the inner wall of the static valve 121. By providing the buffer pad, the downhole crawler 100 can be held more firmly, radial rotation and axial movement can be prevented, and reliability and stability can be improved. The buffer pad can be made of rubber.

[0052] In some embodiments, the gear box 21 includes a box body 2101 and a box cover 2102, the box cover 2102 is detachably connected to the box body 2101, and the gear assembly 28 is arranged in the box body 2101. The gear assembly 28 is arranged in the box body 2101 to facilitate lubrication of the gear assembly 28. At the same time, the box cover 2102 is detachably connected to the box body 2101 to achieve sealing of the box body 2101, avoid any misoperation and get involved in the gear assembly 28, and improve the safety of the device. The first mounting hole 211 and the second mounting hole 212 penetrate the box body 2101 and the box cover 2102.

[0053] In some embodiments, the gear assembly 28 includes a driving gear 281, a driven gear 282 and a plurality of transmission gears 283, wherein the driving gear 281 is mounted on the active load shaft 25, and the two driven gears 282 are respectively mounted on the two driven output shafts 26, and the plurality of transmission gears 283 are rotatably mounted on the housing 2101, and are transmission-engaged between the driving gear 281 and the driven gears 282. The transmission box assembly 2 also includes two first driven shafts 240 and two second driven shafts 250. Four transmission gears 283 are provided. The first driven shaft 240 is equipped with a transmission gear 283, and the second driven shaft 250 is equipped with a transmission gear 283. The driving gear 281 on the active load shaft 25 is meshed with the transmission gear 283 on the first driven shaft 240, the transmission gear 283 on the first driven shaft 240 is meshed with the transmission gear 283 on the second driven shaft 250, and the transmission gear 283 on the second driven shaft 250 is meshed with the driven gear 282 on the driven output shaft 26, thereby transmitting the load of the magnetic powder brake 3 to the two measuring wheels 27 in two ways.

[0054] In some embodiments, when the measuring wheel 27 contacts the crawling wheel of the downhole crawler 100, the measuring wheel 27 is parallel to the radial direction of the crawling wheel. Since the measuring wheel 27 is parallel to the radial direction of the crawling wheel, the friction between the measuring wheel 27 and the crawling wheel is greater, and the two measuring wheels 27 contact the two sides of the crawling wheel respectively, which reduces the possibility of slipping, making the traction capacity test result of the crawling wheel more accurate.

[0055] The working principle of the testing device for the traction ability of the underground crawler on the ground in the present invention is: the underground crawler 100 is clamped by the clamping mechanism 12, so that the crawler wheel of the underground crawler 100 is in contact with the measuring wheel 27 and aligned in the vertical direction; the crawler wheel of the underground crawler 100 is powered on and driven, and at this time, the crawler wheel rotates with the measuring wheel 27; if the magnetic powder brake 3 is not loaded through the tension controller 4, the crawler wheel will easily rotate with the measuring wheel 27, and then the torque is transmitted to the magnetic powder brake 3 through the gear assembly 28; if the magnetic powder brake 3 is loaded through the tension controller 4, it is more difficult to rotate the rotating shaft of the magnetic powder brake 3. At this time, the load torque is transmitted to the measuring wheel 27 through the gear system in the gear box 21, and it is more difficult for the crawler wheel to drive the measuring wheel 27 to rotate. The braking torque of the magnetic powder brake 3 can be controlled by adjusting the current through the tension controller 4, and then the load to rotate the measuring wheel 27 can be changed through the gear train in the gear box 21. This load is adjustable, and the traction capacity of the creeping wheel can be tested by adjusting the load. The first connecting plate 22 and the second connecting plate 23 can be connected and fixed to the gear box 21 at multiple different installation positions to adjust the spacing between the two driven output shafts 26 to simulate casings of different diameters.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for testing the traction ability of a downhole crawler on the ground, characterized in that: It includes a test stand, a transmission box assembly, a magnetic powder brake and a tension controller, wherein: The test frame includes a main frame and two clamping mechanisms, wherein the two clamping mechanisms are respectively connected to both ends of the main frame in the length direction and are used to clamp the downhole crawler; The transmission box assembly includes a gear box, two first connecting plates, two second connecting plates, a fixed plate, an active load shaft, two driven output shafts, two measuring wheels and a gear assembly; the two first connecting plates and the two second connecting plates are rotatably mounted on the gear box; the fixed plate is respectively connected to the gear box and the main frame; the active load shaft is rotatably mounted on the fixed plate; the two driven output shafts are respectively rotatably mounted on the first connecting plate and the second connecting plate, and the first connecting plate and the second connecting plate can be connected and fixed to the gear box at multiple different mounting positions to adjust the spacing between the two driven output shafts; the two measuring wheels are respectively mounted on the two driven output shafts for contacting the crawler wheels of the downhole crawler; so the gear assembly is respectively connected to the active load shaft and the two driven output shafts; The magnetic powder brake is connected to the active load shaft; The tension controller is connected to the magnetic powder brake by electrical signals and is used to control the current value of the exciting current of the magnetic powder brake.

2. The device for testing the traction ability of a downhole crawler on the ground according to claim 1, characterized in that: The transmission box assembly also includes a first rotating shaft and a second rotating shaft, and the first rotating shaft and the second rotating shaft are symmetrically fixed on the gear box with the length direction of the main frame as the symmetry axis; two first connecting plates are rotatably installed on the first rotating shaft; and two second connecting plates are rotatably installed on the second rotating shaft.

3. The device for testing the traction ability of a downhole crawler on the ground as claimed in claim 2, characterized in that: The gear box is symmetrically provided with a plurality of first mounting holes and a plurality of second mounting holes; the first connecting plate is provided with a first connecting hole matching the first mounting hole, and the second connecting plate is provided with a second connecting hole matching the second mounting hole; The transmission box assembly also includes a first connecting pin and a second connecting pin, wherein the first connecting pin is used to connect the first mounting hole and the first connecting hole, and the second connecting pin is used to connect the second mounting hole and the second connecting hole.

4. The device for testing the traction ability of a downhole crawler on the ground as claimed in claim 3, characterized in that: The plurality of first mounting holes are distributed on a circle with the first rotating axis as the center, and the plurality of second mounting holes are distributed on a circle with the second rotating axis as the center.

5. The device for testing the traction ability of a downhole crawler on the ground according to claim 1, characterized in that: The clamping mechanism includes a static valve, a dynamic valve, a hinge pin, a mounting pin, a pull rod screw and a connecting nut; the static valve is fixedly mounted at one end of the main frame in the length direction, and an ear seat is provided on the static valve; the dynamic valve and the static valve are hingedly connected by the hinge pin to embrace the downhole crawler; both ends of the mounting pin are mounted in the ear seat, the pull rod screw is sleeved on the mounting pin, and the connecting nut is threadedly connected to the pull rod screw and can abut against the outer surface of the dynamic valve.

6. The device for testing the traction ability of a downhole crawler on the ground as claimed in claim 5, characterized in that: The clamping mechanism also includes a retaining ring, a limiting boss is provided at one end of the hinge pin, and an annular groove is provided at the other end, the limiting boss is used to abut against the end face of the static valve, the annular groove is located outside the static valve, and the retaining ring is installed in the annular groove.

7. The device for testing the traction ability of a downhole crawler on the ground as claimed in claim 6, characterized in that: The inner side wall of the movable valve and the inner side wall of the static valve are provided with a buffer pad.

8. The device for testing the traction ability of a downhole crawler on the ground as claimed in claim 1, characterized in that: The gear box comprises a box body and a box cover, the box cover is detachably connected to the box body, and the gear assembly is arranged in the box body.

9. The device for testing the traction ability of a downhole crawler on the ground as claimed in claim 8, characterized in that: The gear assembly includes a driving gear, a driven gear and a plurality of transmission gears, wherein the driving gear is mounted on the driving load shaft, the driven gear is mounted on the driven output shaft, and the plurality of transmission gears are rotatably mounted on the housing and are transmission-engaged between the driving gear and the driven gear.

10. The device for testing the traction ability of a downhole crawler on the ground according to any one of claims 1 to 9, characterized in that: When the measuring wheel contacts the crawling wheel of the downhole crawler, the radial direction of the measuring wheel is parallel to the crawling wheel.

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