A self-balancing round hole wall friction and wear measuring platform

Abstract

The application discloses a self-balancing round hole wall friction and wear measuring platform, which comprises an outer support frame, a test block lifting mechanism, a rock rotating mechanism, a rock centering mechanism and a limiting mechanism; the outer support frame is used for supporting other mechanisms; the test block lifting mechanism is used for driving the test block to reciprocate; the rock rotating mechanism is used for driving the rock to rotate; the rock centering mechanism is used for centering the rock; and the limiting mechanism is used for limiting the rock rotating mechanism; the application can realize the curved surface-to-curved surface test mode between a test block and a rock with a large size through the cooperation between various mechanisms; the friction and wear performance between test blocks with different sizes or different surface structures and the rock can be measured by replacing test heads or changing the surface structure of test pieces; two test blocks can simultaneously contact the round hole wall of the rock for testing, so that the balance of the whole system can be ensured, the eccentric wear phenomenon can be prevented, and the test precision is ensured.

Description

Technical Field

[0001] This invention relates to the field of friction pair wear testing technology, and in particular to a self-balancing circular hole wall friction wear testing platform. Background Technology

[0002] Frictional wear failure between downhole drilling tools and rock is one of the main failure modes of drilling tools. Furthermore, the frictional wear contact surface between the drilling tool and the rock is often subjected to the combined effects of multiple media, including gases, liquids, and solids, leading to diverse and complex material wear behavior and damage mechanisms. Therefore, accurately detecting the frictional wear characteristics and performance parameters between the drilling tool and the borehole wall based on simulating actual working conditions is particularly important.

[0003] Currently, the evaluation of material friction and wear properties is mainly conducted using friction and wear testing machines. The principle of various friction and wear testing machines is as follows: a clamping mechanism holds and fixes the test piece, and then a moving platform drives the clamping mechanism to reciprocate, causing a standard grinding head to grind against the test piece. This method has several shortcomings: First, because the test piece is only subjected to unidirectional force, the clamping mechanism will inevitably deform under this force. To minimize deformation, other components of the testing machine are often reinforced, leading to increased size and weight, and generating significant vibration during testing. Second, the testing methods are mostly plane-to-plane or curved-to-plane, while the size of downhole drilling tools is generally much larger than the size of the test pieces used in friction and wear testing machines, and the contact between the drilling tool and the rock is generally curved-to-curved. Third, the test piece is subjected to a force arm that is parallel to the frictional force and clamping force, resulting in uneven force distribution at the clamping end, which is also a major reason for poor test data accuracy. These shortcomings mean that existing friction and wear testing machines cannot adequately meet the testing requirements for the friction and wear properties between downhole drilling tools and the wellbore. Summary of the Invention

[0004] To address the shortcomings in the aforementioned background technology, this invention aims to provide a self-balancing circular hole wall friction and wear testing platform. This platform can realize self-balancing friction and wear testing between curved surfaces of large-sized test blocks and rocks, and can also provide a variety of testing environments.

[0005] A self-balancing circular hole wall friction and wear testing platform includes an outer support frame, a test block lifting mechanism, a rock rotation mechanism, a rock centering mechanism, and a limiting mechanism;

[0006] The external support frame includes a support body with through holes, and a first connecting plate, a second connecting plate, and a third connecting plate are fixedly connected to the support body.

[0007] The test block lifting mechanism includes a back plate, guide rail, slider, slide plate, drag chain plate, drag chain, lifting drive assembly, and test assembly;

[0008] One side of the back plate is connected to the first connecting plate, and two fourth connecting plates and two guide rail grooves are fixedly connected to the other side of the back plate. Two guide rails are installed in the two guide rail grooves. Two sliders are arranged on each guide rail. The sliders are connected to the slide plate. The lifting drive assembly is arranged between the back plate and the slide plate. One side of the drag chain plate is connected to the slide plate by bolts, and the other side of the drag chain plate is connected to the drag chain by bolts. The other side of the drag chain is fixed to the bracket body.

[0009] The lifting drive assembly includes a lifting motor, a reducer, and an adapter plate connected in sequence and then fixed to a first angular contact bearing seat by bolts. A first coupling is arranged inside the first angular contact bearing seat, and both sides of the first coupling are connected to the reducer and the beginning of the lifting screw, respectively. The beginning of the lifting screw is rotatably connected to the first angular contact bearing seat through the first angular contact bearing. The first angular contact bearing seat and the second angular contact bearing seat are connected to a fourth connecting plate by bolts. The lifting screw passes through the lifting nut and the nut seat. The end of the lifting screw is fixedly connected to the second angular contact bearing set in the second angular contact bearing seat. The lifting nut and the nut seat are connected by bolts. The nut seat is fixedly connected to the slide plate. Therefore, when the lifting motor is started, it will drive the lifting screw to rotate forward or reverse. Through the threaded engagement, the lifting nut will drive the nut seat to move, thereby driving the slide plate to move.

[0010] The testing assembly includes a tension / compression / torsion sensor. The first end of the tension / compression / torsion sensor is connected to the fifth connecting plate on the slide plate. The second end of the tension / compression / torsion sensor is connected to the transition plate and the transmission rod in sequence. The support, outer protective sleeve, and copper sleeve are placed on the outside of the transmission rod and fixed on the slide plate. The transmission rod is a hollow structure with one side closed. A transverse guide hole is opened below the closed side of the transmission rod. The transmission rod is threaded to the test connector. The protective sleeve is concentric with the transmission rod and is connected to the support below. A T-shaped through hole is opened in the test connector. A piston and tower spring are symmetrically arranged in the through hole. A sealing ring is installed between the piston and the test connector. The sealing ring prevents the two sides of the piston from communicating with each other. The piston cover is connected to the test connector and keeps the tower spring in a compressed state. The part of the piston that extends out of the piston cover is fixed to the test block. When the compression medium is injected into the transverse guide hole of the transmission rod, the symmetrically arranged pistons will each push one test block to extend. The two test blocks will contact the rock hole wall at the same time and be tested. When the compression medium is removed, the tower spring will drive the piston and test block to retract.

[0011] The rock rotation mechanism includes a sealing disc, a rock cover, a rock, a gear cover, a support plate, a sealing gasket, a turntable bearing, a drive gear, a support plate, and a rotation motor.

[0012] The output shaft of the rotary motor is connected to the drive gear via a key. The drive gear meshes with the outer ring of the turntable bearing. The inner ring of the turntable bearing is connected to the support plate via bolts. The outer ring of the turntable bearing is coaxially fixed to the sealing gasket and the support plate. A round hole is opened in the middle of the support plate. The gear guard is fixed to the support plate and placed outside the turntable bearing and the drive gear. The rock guard is set on the support plate and placed outside the rock. The sealing plate is set on the top of the rock guard.

[0013] The rock centering mechanism includes a positioning block, a pad plate, and a clamping plate. There are four positioning blocks, which are evenly distributed around the rock. The positioning blocks are connected to the support plate. The positioning blocks have through holes on the side closest to the rock. There are four pad plates, which are arranged between the positioning blocks and the rock. The clamping plate is located above the rock and is connected to the positioning blocks.

[0014] The limiting mechanism includes limiting components and limiting frames. There are two limiting components, symmetrically arranged on both sides of the support body. Each limiting component consists of a first limiting plate, a second limiting plate, multiple third limiting plates, a limiting shaft, and a limiting sleeve. The bottom of the first limiting plate is connected to the third connecting plate through the limiting frame. The second limiting plate is square with a through hole in the middle. The limiting shaft passes through the through hole of the first and second limiting plates, and both ends of the limiting shaft are fixed by the limiting sleeve. Multiple third limiting plates form a square that surrounds the second limiting plate in the center and is connected to the second limiting plate. The third limiting plates are connected to the support plate.

[0015] The beneficial effects of this invention are:

[0016] 1. Through the cooperation between various mechanisms, it is possible to achieve a test method for curved surfaces between large-sized test blocks and rocks.

[0017] 2. The sealing disc, rock cover, support plate and sealing gasket form a closed cavity, which can meet the test conditions of different lubricating media.

[0018] 3. By changing the test connector or altering the surface structure of the test piece, the friction and wear performance between test blocks of different sizes or with different surface structures and rocks can be measured.

[0019] 4. By changing the test piece or the rock, the friction and wear performance between different test materials and different types of rocks can be measured.

[0020] 5. The simultaneous contact and testing of two test blocks with the well wall ensures the balance of the entire system, prevents uneven wear, and guarantees test accuracy. Attached Figure Description

[0021] Figure 1 This is a three-dimensional schematic diagram of the present invention.

[0022] Figure 2 This is a schematic diagram of the external support frame of the present invention.

[0023] Figure 3 for Figure 2 Enlarged diagram of point A in the middle.

[0024] Figure 4 This is a schematic diagram of the lifting mechanism of the present invention.

[0025] Figure 5 This is a schematic diagram showing the position of the lifting drive assembly and backplate of the present invention.

[0026] Figure 6 This is a schematic diagram showing the positions of the test components and slide plate of the present invention.

[0027] Figure 7 This is a schematic diagram of the internal cross-section of the test connector of the present invention.

[0028] Figure 8 This is a schematic cross-sectional view of the rock rotation mechanism of the present invention.

[0029] Figure 9 This is a three-dimensional schematic diagram of the rock translation drive mechanism of the present invention.

[0030] Figure 10 This is a schematic cross-sectional view of the centerer of the present invention.

[0031] Figure 11 This is a schematic diagram showing the position of the positioning block, pad, and clamping plate of the present invention relative to the rock.

[0032] Figure 12 This is a schematic diagram of the limiting mechanism of the present invention.

[0033] 1. Support body; 2. First connecting plate; 3. Second connecting plate; 4. Third connecting plate; 5. Back plate; 6. Guide rail; 7. Slider; 8. Slide plate; 9. Cable drag chain; 10. Lifting drive assembly; 11. Test assembly; 12. Sealing disc; 13. Rock cover; 14. Rock; 15. Gear cover; 16. Support plate; 17. Sealing gasket; 18. Turntable bearing; 19. Drive gear; 20. Support plate; 21. Rotary motor; 22. Translation frame; 23. First crank handle; 24. First bearing seat; 25. First bearing; 26. First drive shaft; 27. Second coupling; 28. Screw jack assembly; 29. ​​Third coupling; 30. Second drive shaft; 31. Fourth coupling; 32. Second bearing seat; 33. Second bearing; 34. Centerer; 35. Positioning block; 36. Pad; 37. Pressure plate; 38.

[0034] Fourth connecting plate 501; guide rail groove 502;

[0035] Fifth connecting plate 801;

[0036] 1101 Lifting motor; 1102 Reducer; 1103 Adapter plate; 1104 First angular contact bearing housing; 1105 First coupling; 1106 Lifting screw; 1107 First angular contact bearing; 1108 Lifting nut; 1109 Nut housing; 1110 Second angular contact bearing housing; 1111 Second angular contact bearing;

[0037] 1201; 1202; 1203; 1204; 1205; 1206; 1207; 1208; 1209; 1210; 1211; 1212; 1213; 1214; 1205; 1206; 1214; 1209; 1210; 1211; 1212; 1213; 1214;

[0038] Housing 2901; Input shaft 2902; Translation screw 2903; Translation nut 2904;

[0039] Second crank handle 3501; centering screw 3502; positioning cover 3503; housing 3504; centering nut 3505; first centering block 3506; second centering block 3507; shaft retaining ring 3508;

[0040] First limiting plate 3901; second limiting plate 3902; multiple third limiting plates 3903; limiting shaft 3904; limiting sleeve 3905. Detailed Implementation

[0041] Please see Figures 1 to 12 A self-balancing circular hole wall friction and wear measuring platform includes an outer support frame, a test block lifting mechanism, a rock rotation mechanism, a rock translation drive mechanism, a rock centering mechanism, and a limiting mechanism;

[0042] The external support frame includes a support body 1, a first connecting plate 2, a second connecting plate 3, and a third connecting plate 4. The support body 1 is composed of six square tubes perpendicular to the ground and multiple square tubes parallel to the ground, which serve to support various mechanisms. The third layer of horizontal square tubes of the support body 1 is provided with through holes 101. The first connecting plate 2, the second connecting plate 3, and the third connecting plate 4 are fixedly connected to the support body 1 for connection with other mechanisms.

[0043] The test block lifting mechanism includes a back plate 5, a guide rail 6, a slider 7, a slide plate 8, a drag chain plate 9, a drag chain 10, a lifting drive assembly 11, and a test assembly 12.

[0044] The lifting drive assembly 11 includes a lifting motor 1101, a reducer 1102, an adapter plate 1103, a first angular contact bearing housing 1104, a first coupling 1105, a lifting screw 1106, a first angular contact bearing 1107, a lifting nut 1108, a nut housing 1109, a second angular contact bearing housing 1110, and a second angular contact bearing 1111.

[0045] The test assembly 12 includes a tension / compression / torsion sensor 1201, a transition plate 1202, a transmission rod 1203, a support base 1204, an outer protective sleeve 1205, a copper sleeve 1206, a sheath 1207, a test connector 1208, a piston 1209, a piston cover 1210, a test block 1211, a tower spring 1212, a sealing ring 1213, and a pin 1214.

[0046] One side of the back plate 5 is bolted to the first connecting plate 2. The other side of the back plate 5 is fixedly connected to two fourth connecting plates 501 and two guide rail grooves 502. Two guide rails 6 are bolted into the two guide rail grooves 502. Two sliders 7 are arranged on each guide rail 6. The sliders 7 are bolted to the slide plate 8. The lifting drive assembly 11 is arranged between the back plate 5 and the slide plate 8. One side of the drag chain plate 9 is bolted to the slide plate 8. The other side of the drag chain plate 9 is bolted to the drag chain 10. The other side of the drag chain 10 is fixed to the bracket body 1. The drag chain 10 protects the signal lines and power supply lines of the lifting motor 1101 and the tension / compression / torsion sensor 1201, and ensures that the signal lines and power supply lines move accordingly when the test block lifting mechanism performs the lifting task.

[0047] The lifting motor 1101, reducer 1102, and adapter plate 1103 are sequentially connected and then fixed to the first angular contact bearing seat 1104 by bolts. The first coupling 1105 is arranged inside the first angular contact bearing seat 1104, and both sides of the first coupling 1105 are connected to the reducer 1102 and the beginning of the lifting screw 1106, respectively. The beginning of the lifting screw 1106 is rotatably connected to the first angular contact bearing seat 1104 through the first angular contact bearing 1107. The first angular contact bearing seat 1104 and the second angular contact bearing seat 1110 are connected to the fourth connecting plate 501. The lifting screw 1106 passes through the lifting nut 1108 and the nut seat 1109 via bolts. The end of the lifting screw 1106 is fixedly connected to the second angular contact bearing 1111 located in the second angular contact bearing seat 1110. The lifting nut 1108 and the nut seat 1109 are connected by bolts. The nut seat 1109 is fixedly connected to the slide plate 8. Therefore, when the lifting motor 1101 starts, it will drive the lifting screw 1106 to rotate forward or reverse. Through the threaded engagement, the lifting nut 1108 drives the nut seat 1109 to move, which in turn drives the slide plate 8 to move.

[0048] The first end of the tension / compression / torque sensor 1201 is connected to the fifth connecting plate 801 mounted on the slide plate 8. The second end of the tension / compression / torque sensor 1201 is sequentially connected to the transition plate 1202 and the transmission rod 1203 via bolts. The tension / compression / torque sensor 1201 is used to measure the changes in tension, compression, and torque during the test. The support base 1204, the outer protective sleeve 1205, and the copper sleeve 1206 are fitted onto the outside of the transmission rod 1203 and fixed to the slide plate 8. There are four support bases 1204. Concentric with the transmission rod 1203, an outer protective sleeve 1205 and a copper sleeve 1206 are arranged between every two support seats 1204 to keep the transmission rod 1203 vertical. The transmission rod 1203 is a hollow structure closed on one side, with a transverse guide hole at the bottom of the closed side. The transmission rod 1203 is threadedly connected to the test connector 1208. The protective sleeve 1207 is concentric with the transmission rod 1203 and is connected to the lower support seat 1204 by bolts. The transmission rod 1203 and the test connector 1208 are protected. The test connector 1208 has a T-shaped through hole, and the piston 1209 and the tower spring 1212 are symmetrically arranged in the through hole. A sealing ring 1213 is installed between the piston 1209 and the test connector 1208, which prevents the two sides of the piston from communicating with each other. The piston cover 1210 is connected to the test connector 1208 by bolts, which keeps the tower spring 1212 in a compressed state. The part of the piston 1209 that extends out of the piston cover 1210 is connected to the test block. 1211 is fixed by pin 1214. When the compressed medium is injected into the transverse guide hole of the transmission rod 1203, the symmetrically arranged pistons 1209 will each push one test block 1211 to extend. The two test blocks 1211 contact the well wall at the same time and perform the test. The test part forms a force self-balance, which ensures the balance and stability of the entire system, prevents uneven wear, and improves the test accuracy. When the compressed medium is removed, the tower spring 1212 drives the piston 1209 and the test block 1211 to retract.

[0049] The rock rotation mechanism includes a sealing disc 13, a rock cover 14, a rock 15, a gear cover 16, a support plate 17, a sealing gasket 18, a turntable bearing 19, a drive gear 20, a support plate 21, and a rotation motor 22.

[0050] The output shaft of the rotary motor 22 is connected to the drive gear 20 via a key. The drive gear 20 meshes with the outer ring of the turntable bearing 19. The inner ring of the turntable bearing 19 is connected to the support plate 21 via bolts. When the rotary motor 22 rotates, the turntable bearing 19 can achieve the effect of separating the dynamic and static parts. The outer ring of the turntable bearing 19 is coaxially fixed with the sealing gasket 18 and the support plate 17. The rock is placed on the support plate 17. Therefore, when the outer ring of the turntable bearing 19 rotates, it will drive the sealing gasket 18, the support plate 17 and the rock 15 to rotate together. The support plate 17 has a round hole in the middle for concentric mating with the outer shell 3504. The gear guard 16 is fixed to the support plate 21 and placed outside the turntable bearing 19 and the drive gear 20. The gear guard 16 protects the turntable bearing 19 and the drive gear 20. The rock guard 14 is placed on the support plate 17 and placed outside the rock 15 to protect the rock 15. The sealing disc 13 is placed on the top of the rock guard 14 to prevent the lubricating medium from splashing.

[0051] The rock translation drive mechanism includes a translation frame 23, a first crank handle 24, a first bearing seat 25, a first bearing 26, a first drive shaft 27, a second coupling 28, a screw jack 29, a third coupling 30, a second drive shaft 31, a fourth coupling 32, a second bearing seat 33, and a second bearing 34.

[0052] The translation frame 23 is connected to the first connecting plate 2 by bolts, serving to support the upper rock rotation mechanism and house the rock translation drive mechanism. The first bearing seat 25 and the second bearing seat 33 are fixedly connected to the second connecting plate 3. The first drive shaft 27 is rotatably connected to the first bearing seat 25 through the first bearing 26. The second drive shaft 31 is rotatably connected to the second bearing seat 33 through the second bearing 34. The first crank handle 24 is fixedly connected to the second coupling 28 through the first drive shaft 27. The third coupling 30 is fixedly connected to the fourth coupling 32 through the second drive shaft 31. The second coupling 28 and the third coupling 30 mesh with the screw jack assembly 29. The screw jack assembly 29 meshes with the support plate 21, thereby transmitting motion to the rock rotation mechanism.

[0053] Specifically, when the first crank handle 24 is rotated, the first drive shaft 27, the second coupling 28, the third coupling 30, the second drive shaft 31, and the fourth coupling 32 transmit motion to the two screw jack units 29. The translation screw 2903 rotates, and the translation nut 2904 moves horizontally. The translation nut 2904 is fixedly connected to the support plate 21, thereby transmitting motion to the rock rotation mechanism. The screw jack unit 29 is existing technology and includes a housing 2901, an input shaft 2902, a translation screw 2903, and a translation nut 2904.

[0054] The rock centering mechanism includes a centerer 35, a positioning block 36, a pad 37, and a clamping plate 38. The centerer 35 includes a second rocking handle 3501, a centering screw 3502, a positioning cover 3503, a housing 3504, a centering nut 3505, a first centering block 3506, a second centering block 3507, and a shaft retaining ring 3508.

[0055] The second crank handle 3501 is connected to the centering screw 3502 via a key. The centering screw 3502 has threads with opposite helical directions at both ends. The positioning cover 3503 is connected to the outer shell 3504 via bolts. The centering screw 3502 is rotatably connected to the positioning cover 3503 and the outer shell 3504. The centering screw 3502 is provided with two centering nuts 3505. The bottom of the centering screw 3502 is provided with a step and a groove. The step is stuck on the lower inner wall of the outer shell 3504, preventing the centering screw 3502 from moving downward. The groove is provided with a shaft retaining ring 3508, which is stuck on the lower outer wall of the outer shell 3504, preventing the centering screw 3502 from moving upward. Thus, when the second crank handle 3501 is rotated, the two centering nuts 3505 will move closer or further apart. The two centering nuts 3505 are respectively connected to the four first centering blocks 3506 and the four second centering blocks 3506. 507 is hinged, and each first centering block 3506 and each second centering block 3507 are also hinged. When the two centering nuts 3505 approach each other, the four first centering blocks 3506 and the four second centering blocks will extend from the outer shell 3504 and push against the inner wall of the center hole of the rock 15 for centering. There are four positioning blocks 36, which are evenly distributed around the rock 15. The positioning blocks 36 are connected to the support plate 17 by bolts. The side of the positioning block 36 near the rock 15 has a through hole. There are four pads 37, which are arranged between the positioning blocks 36 and the rock 15. The clamping plate 38 is located above the rock 15 and is connected to the positioning blocks 36 by bolts. When the centerer 35 has completed its work and the rock 15 is in the right position, the positioning blocks 36 and the pads 37 are installed around the rock 15 to fix the rock 15. The clamping plate 38 is connected to the positioning blocks 36 by bolts to fix the rock 15 from above.

[0056] The limiting mechanism includes limiting components and limiting frames. There are two limiting components, symmetrically arranged on both sides of the support body 1. Each limiting component consists of a first limiting plate 3901, a second limiting plate 3902, multiple third limiting plates 3903, a limiting shaft 3904, and a limiting sleeve 3905. The bottom of the first limiting plate 3901 is connected to the third connecting plate 4 via the limiting frame. The second limiting plate 3902 is square with a through hole in the middle. The limiting shaft 3904 passes through the first limiting plate 3901 and the third connecting plate 4. The second limiting plate 3902 has a through hole, and the two ends of the limiting shaft 3904 are fixed by the limiting sleeve 3905. Multiple third limiting plates 3903 form a square surrounding the second limiting plate 3902 and are connected to the second limiting plate 3902 by bolts. The third limiting plates 3903 are connected to the support plate 21 by bolts. When the rock rotation mechanism moves to the appropriate position, the support plate 21 is connected to the multiple third limiting plates 3903 by bolts to prevent the rock rotation mechanism from moving during the test.

[0057] Furthermore, the bottom horizontal square tube of the support body 1 is broken in the middle to allow the rotary motor to pass through.

[0058] Furthermore, different test connectors 1208 can be replaced according to the size and shape of the test block 1211.

[0059] Furthermore, the sealing disc 13, rock shield 14, support plate 17, and sealing gasket 18 form a sealed cavity, which can meet the test conditions of different lubricating media.

[0060] Furthermore, different types of rock 15 or other test materials can be used for testing.

[0061] Working principle and usage of this invention:

[0062] Testing process:

[0063] The lifting motor 1101 rotates forward, driving the lifting screw 1106 to rotate. The lifting screw 1106 and the lifting nut 1107 are connected by a threaded engagement, causing the lifting nut 1107 to move downward. Since the lifting nut 1107 is fixedly connected to the nut seat 1108, and the nut seat 1108 is fixedly connected to the slide plate 8, and the test assembly is installed on the slide plate 8, the test assembly 12 will move downward as a whole. When the test connector 1208 and the test block 1211 are inserted into the appropriate position in the through hole in the middle of the rock 15, the lifting motor 1101 stops running.

[0064] The compression medium is injected into the transmission rod 1203, so that the symmetrically arranged pistons 1209 will each push a test block 1211 to extend. The two test blocks 1211 simultaneously contact the wall of the circular hole in the middle of the rock 15 and perform the test. The changes in tension, pressure and torque during the test are measured by the tension, pressure and torque sensor 1201.

[0065] If the lifting motor 1101 alternates between forward and reverse rotation, a reciprocating motion test can be achieved; if the rotary motor 22 is started but the lifting motor 1101 is not started, a rotary motion test can be achieved; if the rotary motor 22 is started and the lifting motor 1101 is started at the same time, both reciprocating and rotary motion tests can be achieved.

[0066] After the test, the compression medium is removed, the tower spring 1212 resets and drives the piston 1209 and test block 1211 to retract, the lifting motor 1101 reverses, and the test assembly 12 moves upward as a whole, returning to the initial position.

[0067] Rock replacement and centering process

[0068] When the rock needs to be replaced, loosen the bolts between the multiple third limit plates 3903 and the support plate 21, and crank the first crank handle 24. The rock rotation mechanism is then moved to the other side via the screw jack assembly 29. Once the rock rotation mechanism is in the appropriate position, remove the rock guard 14, gear guard 16, clamping plate 38, positioning block 36, and pad 37 in sequence. Replace with a new rock 15. The centering device 35 is positioned at the center of the support plate 17 through the fit between the outer shell 3504 and the center hole of the support plate 17. Crank the second crank handle 3501. Due to the centering screw 3... 502 cannot move axially, causing the two centering nuts 3505 to move closer to each other. This causes the four first centering blocks 3506 and the four second centering blocks to extend from the periphery of the outer shell 3504 and push against the inner wall of the center hole of the rock 15, making the new center hole of the rock 15 concentric with the support plate 17. Then, the positioning block 36, pad 37, clamping plate 38, gear guard 16 and rock guard 14 are installed in sequence. The first rocking handle 24 is rocked in the opposite direction. After the rock rotation mechanism returns to the initial position, the bolts between the multiple third limit plates 3903 and the support plate 21 are installed.

Claims

1. A self-balancing circular hole wall friction and wear measuring platform, characterized in that: This includes an external support frame, a test block lifting mechanism, a rock rotation mechanism, a rock centering mechanism, and a limiting mechanism; The external support frame includes a support body (1), which has a through hole (101). A first connecting plate (2), a second connecting plate (3), and a third connecting plate (4) are fixedly connected to the support body (1). The test block lifting mechanism includes a back plate (5), a guide rail (6), a slider (7), a slide plate (8), a drag chain plate (9), a drag chain (10), a lifting drive assembly (11), and a test assembly (12). One side of the back plate (5) is connected to the first connecting plate (2), and the other side of the back plate (5) is fixedly connected to two fourth connecting plates (501) and two guide rail grooves (502). Two guide rails (6) are installed in the two guide rail grooves (502). Two sliders (7) are arranged on each guide rail (6). The sliders (7) are connected to the slide plate (8). The lifting drive assembly (11) is arranged between the back plate (5) and the slide plate (8). One side of the drag chain plate (9) is connected to the slide plate (8) by bolts. The other side of the drag chain plate (9) is connected to the drag chain (10) by bolts. The other side of the drag chain (10) is fixed on the bracket body (1). The lifting drive assembly (11) includes a lifting motor (1101). The lifting motor (1101), reducer (1102), and adapter plate (1103) are connected in sequence and then fixed to the first angular contact bearing seat (1104) by bolts. The first coupling (1105) is arranged inside the first angular contact bearing seat (1104), and the two sides of the first coupling (1105) are respectively connected to the reducer (1102) and the head end of the lifting screw (1106). The head end of the lifting screw (1106) is rotatably connected to the first angular contact bearing seat (1104) through the first angular contact bearing (1107). The first angular contact bearing seat (1104) and the second angular contact bearing seat (1110) are connected to each other. The lifting screw (1106) is bolted to the fourth connecting plate (501). The lifting screw (1106) passes through the lifting nut (1108) and the nut seat (1109). The end of the lifting screw (1106) is fixedly connected to the second angular contact bearing (1111) set in the second angular contact bearing seat (1110). The lifting nut (1108) and the nut seat (1109) are bolted together. The nut seat (1109) is fixedly connected to the slide plate (8). Therefore, when the lifting motor (1101) is started, it will drive the lifting screw (1106) to rotate forward or reverse. Through the threaded engagement, the lifting nut (1108) drives the nut seat (1109) to move, which in turn drives the slide plate (8) to move. The test assembly (12) includes a tension / compression / torsion sensor (1201). The first end of the tension / compression / torsion sensor (1201) is connected to the fifth connecting plate (801) set on the slide plate (8). The end of the tension / compression / torsion sensor (1201) is connected to the transition plate (1202) and the transmission rod (1203) in sequence. The support base (1204), the outer protective sleeve (1205), and the copper sleeve (1206) are fitted on the outside of the transmission rod (1203) and fixed on the slide plate (8). The transmission rod (1203) is a hollow structure with one side closed. A transverse guide hole is opened below the closed side of the transmission rod (1203). The transmission rod (1203) is threadedly connected to the test connector (1208). The protective sleeve (1207) is concentric with the transmission rod (1203). The protective sleeve (1207) is connected to the lower support base (1204). The test connector (1208) has an opening inside. A T-shaped through hole is provided, in which pistons (1209) and tower springs (1212) are symmetrically arranged. A sealing ring (1213) is installed between the piston (1209) and the test connector (1208). The sealing ring (1213) prevents the two sides of the piston from being connected. The piston cover (1210) is connected to the test connector (1208) and the tower spring (1212) is in a compressed state. The piston (1209) extends out of the piston cover (1210) and is fixed to the test block (1211). When the compression medium is injected into the transverse guide hole of the transmission rod (1203), the symmetrically arranged pistons (1209) will each push one test block (1211) to extend. The two test blocks (1211) simultaneously contact the circular hole wall of the rock (15) and are tested. When the compression medium is removed, the tower spring (1212) drives the piston (1209) and the test block (1211) to retract. The rock rotation mechanism includes a sealing disc (13), a rock cover (14), a rock (15), a gear cover (16), a support plate (17), a sealing gasket (18), a turntable bearing (19), a drive gear (20), a support plate (21), and a rotation motor (22). The output shaft of the rotary motor (22) is connected to the drive gear (20) via a key. The drive gear (20) meshes with the outer ring of the turntable bearing (19). The inner ring of the turntable bearing (19) is connected to the support plate (21) via bolts. The outer ring of the turntable bearing (19) is coaxially fixed with the sealing gasket (18) and the support plate (17). The support plate (17) has a round hole in the middle. The gear guard (16) is fixed to the support plate (21) and placed outside the turntable bearing (19) and the drive gear (20). The rock guard (14) is set on the support plate (17) and placed outside the rock (15). The sealing disc (13) is set on the top of the rock guard (14). The rock centering mechanism includes a positioning block (36), a pad (37), and a pressing plate (38). There are four positioning blocks (36), which are evenly arranged around the rock (15). The positioning blocks (36) are connected to the support plate (17). The positioning blocks (36) have through holes on the side of the rock (15). There are four pads (37), which are arranged between the positioning blocks (36) and the rock (15). The pressing plate (38) is located above the rock (15) and is connected to the positioning blocks (36). The limiting mechanism includes a limiting component and a limiting frame. There are two limiting components, symmetrically arranged on both sides of the support body (1). Each limiting component consists of a first limiting plate (3901), a second limiting plate (3902), multiple third limiting plates (3903), a limiting shaft (3904), and a limiting sleeve (3905). The bottom of the first limiting plate (3901) is connected to the third connecting plate (4) via the limiting frame. The second limiting plate (3902)... The first limiting plate (3904) is square with a through hole in the middle. The limiting shaft (3904) passes through the through holes of the first limiting plate (3901) and the second limiting plate (3902). The two ends of the limiting shaft (3904) are fixed by the limiting sleeve (3905). Multiple third limiting plates (3903) form a square to surround the second limiting plate (3902) in the center and are connected to the second limiting plate (3902). The third limiting plate (3903) is connected to the support plate (21). It also includes a rock translation drive mechanism, which includes a translation frame (23), a first crank handle (24), a first bearing seat (25), a first bearing (26), a first drive shaft (27), a second coupling (28), a screw jack assembly (29), a third coupling (30), a second drive shaft (31), a fourth coupling (32), a second bearing seat (33), and a second bearing (34). The translation frame (23) is connected to the first connecting plate (2), the first bearing seat (25) and the second bearing seat (33) are fixedly connected to the second connecting plate (3), the first drive shaft (27) is rotatably connected to the first bearing seat (25) through the first bearing (26), the second drive shaft (31) is rotatably connected to the second bearing seat (33) through the second bearing (34), the first crank handle (24) is fixedly connected to the second coupling (28) through the first drive shaft (27), the third coupling (30) is fixedly connected to the fourth coupling (32) through the second drive shaft (31), the second coupling (28) and the third coupling (30) mesh with the screw jack assembly (29), and the screw jack assembly (29) meshes with the support plate (21), thereby transmitting the motion to the rock rotation mechanism; The support body (1) has a horizontal square tube at the bottom center that is broken in the middle, which is used to allow the rotary motor to pass through.

2. The self-balancing circular hole wall friction and wear measuring platform according to claim 1, characterized in that: It also includes a centering device (35), which includes a second crank handle (3501), a centering screw (3502), a positioning cover (3503), a housing (3504), a centering nut (3505), a first centering block (3506), a second centering block (3507), and a shaft retaining ring (3508). The second crank handle (3501) is connected to the centering screw (3502) by a key. The centering screw (3502) is provided with threads with opposite helical directions at both ends. The positioning cover (3503) is connected to the housing (3504) by bolts. The centering screw (3502) is rotatably connected to the positioning cover (3503) and the housing (3504). The centering screw (3502) is provided with two... Two centering nuts (3505) are provided with a step and a groove at the bottom of the centering screw (3502). The step is stuck on the lower inner wall of the outer shell (3504). A shaft retaining ring (3508) is arranged on the groove. The shaft retaining ring (3508) is stuck on the lower outer wall of the outer shell (3504). The two centering nuts (3505) are respectively hinged to four first centering blocks (3506) and four second centering blocks (3507). Each first centering block (3506) and each second centering block (3507) are also hinged. When the two centering nuts (3505) approach each other, the four first centering blocks (3506) and the four second centering blocks will extend from the outer shell (3504) and push against the inner wall of the center hole of the rock (15) for centering.

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