A fatigue impact damage testing machine

Abstract

The present invention belongs to the technical field of testing machines, and relates to a fatigue impact damage testing machine. The testing machine also includes a base, a slide slidably arranged on the base; a mounting tube fixedly arranged on the slide; the mounting tube is rotatably connected to a casing; the casing is axially slidably connected to a drill bit assembly; an impact assembly is arranged in the mounting tube; the impact assembly applies an impact force to the drill bit assembly. The slide also includes an impact adjustment mechanism and a torque adjustment mechanism. By adjusting the speed of the variable speed motor, the impact frequency of the impact hammer can be adjusted. By matching the first incomplete gear with the first rack or matching the second incomplete gear with the second rack, the impact force of the impact hammer can be adjusted. By matching the first driving gear with the first driven gear or matching the second driving gear with the second driven gear, the torque of the PDC drill bit can be adjusted. The electric telescopic rod adjusts the degree of extension according to the pressure value of the pressure sensor to keep the PDC drill bit at a specific pressure.

Description

Technical Field

[0001] The invention belongs to the technical field of testing machines and relates to a fatigue impact damage testing machine. Background Art

[0002] PDC drill bits are made of polycrystalline diamond and small cutting blocks are inlaid or sintered onto the drill bit body. They are suitable for soft to medium hard formations.

[0003] Because PDC drill bits often operate in heterogeneous formations, the impact forces and frequencies experienced by PDC drill bits in heterogeneous formations vary. Different torques, impact forces, and impact frequencies result in different fatigue damage to PDC drill bits. Therefore, a test device with controllable output energy and frequency is required to test PDC drill bits and simulate the service life of PDC drill bit samples under actual drilling conditions in heterogeneous formations.

[0004] In order to solve the above problems, the present invention proposes a fatigue impact damage testing machine. Summary of the Invention

[0005] In order to solve the problems existing in the background technology, the present invention proposes a fatigue impact damage testing machine.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: comprising a base, a slide being slidably provided on the base; a mounting tube being fixedly provided on the slide; a sleeve being rotatably connected to the mounting tube; a drill bit assembly being axially slidably connected to the sleeve; an impact assembly being provided in the mounting tube; the impact assembly applying an impact force to the drill bit assembly;

[0007] An electric telescopic rod, the electric telescopic rod is fixedly mounted on the base and is drivingly connected to the slide;

[0008] An impact adjustment mechanism, the impact adjustment mechanism being drivingly connected to the impact assembly; the impact adjustment mechanism comprising a variable speed motor fixed to the carriage, a plurality of incomplete gears of different diameters, a plurality of racks slidably disposed on the carriage, and a spring; the plurality of incomplete gears correspondingly matching the plurality of racks; only one incomplete gear being in meshing engagement with the corresponding rack at any one time; the incomplete gears being drivingly connected to the variable speed motor; and the spring abutting between an end of the carriage away from the drill assembly and the rack.

[0009] The torque adjustment mechanism includes a servo motor and a transmission member fixed on the base; the servo motor is connected to the sleeve through the transmission member.

[0010] Furthermore, a first sleeve is fixedly mounted on the output shaft of the variable speed motor, a first rotating shaft is slidably fitted in the first sleeve, and a plurality of first positioning holes are provided on the first rotating shaft; a first through hole is provided on the first sleeve to cooperate with the first positioning hole, and a first positioning pin is fitted in the first through hole.

[0011] Furthermore, a support block is fixed at one end of the base, and a top block is fixed at one end of the slide close to the support block;

[0012] The electric telescopic rod is fixedly mounted on the support block, and the output end of the electric telescopic rod is fixedly connected to the top block; a pressure sensor is provided between the output end of the electric telescopic rod and the top block.

[0013] Furthermore, the drill bit assembly includes a PDC drill bit and a connecting shaft; the connecting shaft includes a large diameter section and a small diameter end, and the large diameter section and the small diameter section are fixedly connected;

[0014] The PDC drill bit is threadedly connected to the large diameter section of the connecting shaft;

[0015] A connecting groove is provided in the axial direction of the small-diameter end of the connecting shaft, a fixing key is fixed on the sleeve, and the connecting groove and the fixing key are slidably matched.

[0016] Furthermore, the impact assembly includes an impact hammer and a hydraulic cylinder;

[0017] The hydraulic cylinder is fixedly arranged in the mounting tube, and a baffle is fixed in the hydraulic cylinder, and a connecting hole is opened on the baffle; the baffle divides the hydraulic cylinder into a first hydraulic chamber and a second hydraulic chamber;

[0018] A first piston plate is sealingly and slidingly fitted in the first hydraulic cavity, a first piston rod is fixedly mounted on the first piston plate, and one end of the first piston rod away from the first piston plate passes through the hydraulic cylinder and is fixedly connected to the impact adjustment mechanism;

[0019] A second piston plate is sealingly and slidingly fitted in the second hydraulic cavity, a second piston rod is fixedly provided on the second piston plate, and one end of the second piston rod away from the second piston plate passes through the hydraulic cylinder and is fixedly connected to the impact hammer.

[0020] Furthermore, two fixing rings are fixedly provided in the mounting tube; the fixing rings include a first ring segment and a second ring segment, the first ring segment and the second ring segment are fixedly connected; the inner diameter of the first ring segment is smaller than the inner diameter of the second ring segment; the second ring segment is located inside the two fixing rings;

[0021] A clamping groove is provided on the first ring segment, and clamping blocks matching the clamping groove are fixedly provided at both ends of the hydraulic cylinder.

[0022] Furthermore, a bearing is installed at one end of the mounting cylinder close to the PDC drill bit, and the casing is rotatably connected to the mounting cylinder through the bearing.

[0023] Furthermore, the transmission member includes a plurality of driving gears and a plurality of passive gears; the plurality of driving gears are matched with the plurality of passive gears in a one-to-one correspondence;

[0024] The driving gear is drivingly connected to the output shaft of the servo motor; the driven gear is fixedly mounted on the sleeve;

[0025] At the same time, only one driving gear and the corresponding driven gear are in meshing state.

[0026] Furthermore, a second sleeve is fixedly mounted on the output shaft of the servo motor, and a second rotating shaft is slidably fitted in the second sleeve; a plurality of second positioning holes are provided on the second rotating shaft, a second through hole is provided on the second sleeve, and a second positioning pin is fitted in the second through hole.

[0027] Furthermore, it also includes a controller; a control panel is installed on the support block; the control panel, pressure sensor, servo motor, and variable speed motor are all electrically connected to the controller.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. By adjusting the speed of the variable speed motor, the impact frequency of the impact hammer can be adjusted.

[0030] 2. The impact force of the impact hammer can be adjusted by matching the first incomplete gear with the first rack or matching the second incomplete gear with the second rack.

[0031] 3. The torque of the PDC drill bit can be adjusted by the cooperation between the first driving gear and the first driven gear or the cooperation between the second driving gear and the second driven gear.

[0032] 4. The electric telescopic rod adjusts the degree of extension according to the pressure value of the pressure sensor to keep the PDC drill bit at a specific pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the external structure of the present invention;

[0034] Figure 2 In the present invention Figure 1 A magnified view of part A;

[0035] Figure 3 This is a schematic diagram of the cooperation between the first rotating shaft and the first sleeve in the present invention;

[0036] Figure 4 It is a structural schematic diagram of the slide in the present invention;

[0037] Figure 5 It is a structural diagram of the limiting chute in the present invention;

[0038] Figure 6 This is a schematic diagram of the connection between the incomplete gear and the rack of the present invention;

[0039] Figure 7 In the present invention Figure 6 A magnified view of part B;

[0040] Figure 8 is a partial cross-sectional view of the present invention;

[0041] Figure 9 In the present invention Figure 8 Magnified view of part C;

[0042] Figure 10 In the present invention Figure 8 Magnified view of the D part;

[0043] Figure 11 Schematic diagram of the hydraulic cylinder in the present invention

[0044] Figure 12 It is a structural schematic diagram of the fixing ring in the present invention;

[0045] Figure 13 It is a structural schematic diagram of the sleeve in the present invention;

[0046] Figure 14 It is a structural schematic diagram of the drill bit assembly of the present invention;

[0047] Figure 15 It is a structural schematic diagram of the PDC drill bit of the present invention.

[0048] In the figure: 1. Base; 101. Support block; 102. Fixed block; 103. Control panel; 104. Limiting slide; 105. Electric telescopic rod; 2. Slide; 201. Limiting slider; 202. Top block; 3. Speed-changing motor; 301. First bushing; 302. First rotating shaft; 303. First positioning pin; 304. First positioning hole; 305. First incomplete gear; 306. Second incomplete gear; 307. First rack; 308. Second rack; 309. Connecting bar; 310. Spring; 4. Mounting cylinder; 401. Fixing ring; 402. Hydraulic cylinder; 403. Slot; 404. Block; 405, first hydraulic chamber; 406, second hydraulic chamber; 407, baffle; 408, communicating hole; 409, first piston plate; 410, first piston rod; 411, second piston plate; 412, second piston rod; 413, impact hammer; 414, bearing; 5, sleeve; 501, fixing key; 502, first driven gear; 503, second driven gear; 504, first driving gear; 505, second driving gear; 506, second rotating shaft; 507, second bushing; 508, second locating pin; 509, servo motor; 6, connecting shaft; 601, connecting groove; 7, PDC drill bit. DETAILED DESCRIPTION

[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0050] like Figures 1-15 As shown, the technical solution adopted by the present invention is as follows: a fatigue impact damage testing machine includes a base 1, a slide 2, a drill assembly, an impact assembly, an impact adjustment mechanism, and a torque adjustment mechanism.

[0051] A plurality of fixed blocks 102 are fixedly provided on both sides of the base 1. A limited slot 104 is provided along the length of the base 1. A support block 101 is fixedly provided at one end of the base 1. A control panel 103 is provided on the support block 101. An electric telescopic rod 105 is mounted on the support block 101.

[0052] A stop block 201 is fixedly mounted on the bottom of the carriage 2, slidably engaging the stop slot 104. The carriage 2 is slidably mounted on the base 1, via the stop slot 104 and the stop block 201. A top block 202 is fixedly mounted on one end of the carriage 2. The output end of the electric telescopic rod 105 is fixedly connected to the top block 202, with a pressure sensor positioned between the output end and the top block 202.

[0053] Two parallel chutes are provided on the slide 2 along the length direction of the slide 2, and a connecting bar 309 is slidably fitted in the chutes. Specifically, two sliders are fixed at the bottom of the connecting bar 309, and the two sliders correspond to the two chutes one by one, and each slider slidably fits with the corresponding chutes.

[0054] The impact adjustment assembly includes a variable speed motor 3 , a plurality of incomplete gears, a plurality of racks, and a spring 310 .

[0055] Multiple racks are arranged parallel to each other, and multiple incomplete gears are mated to the racks in a one-to-one correspondence, with only one incomplete gear mated to the corresponding rack at any one time. In this embodiment, there are two incomplete gears and two racks. For ease of description, the two incomplete gears are designated as the first incomplete gear 305 and the second incomplete gear 306. The two racks are designated as the first rack 307 and the second rack 308. The first rack 307 and the second rack 308 are parallel to each other. The first incomplete gear 305 is mated to the first rack 307, and the second incomplete gear 306 is mated to the second rack 308. The pitch circle diameter of the first incomplete gear 305 is larger than the pitch circle diameter of the second incomplete gear 306. Therefore, under the same angular velocity, the first incomplete gear 305 has a greater linear velocity. The variable speed motor 3 drives the first and second incomplete gears 305, 306 to rotate synchronously. Thus, when the first incomplete gear 305 is meshed with the first rack 307. The linear velocity of the connecting bar 309 is greater, so that the impact force of the impact assembly on the drill bit assembly is greater.

[0056] Specifically, a first sleeve 301 is fixedly mounted on the output shaft of the variable speed motor 3. A first rotating shaft 302 is slidingly engaged in the first sleeve 301, and a plurality of first positioning holes 304 are provided on the first rotating shaft 302. A first through hole that cooperates with the first positioning hole 304 is provided on the first sleeve 301, and a first positioning pin 303 is engaged in the first through hole. In this embodiment, the number of the first positioning holes 304 is two. The first positioning pin 303 is inserted into the first through hole and one of the first positioning holes 304 to fix the first rotating shaft 302 on the first sleeve 301. The first through hole cooperates with different first positioning holes 304 to enable the first incomplete gear 305 to cooperate with the first rack 307, or to enable the second incomplete gear 306 to cooperate with the second rack 308.

[0057] Preferably, a first keyway is provided in the axial direction of the first rotating shaft 302, and a first key that is slidably engaged with the first keyway is fixedly provided on the first sleeve 301. This allows for a more stable connection between the first rotating shaft 302 and the first sleeve 301.

[0058] The spring 310 abuts between the top block 202 and the connecting bar 309. One end of the spring 310 is fixedly connected to the top block 202, and the other end of the spring 310 is fixedly connected to the connecting bar 309. The spring 310 has the function of resetting the connecting bar 309. When the incomplete gear drives the corresponding rack to engage, the connecting bar 309 moves away from the top block 202, and the spring 310 is stretched and has elastic potential energy. When the incomplete gear is disengaged from the rack, the spring 310 drives the connecting bar 309 to move toward the top block 202. When the incomplete gear and the rack are intermittently engaged, the connecting bar 309 reciprocates.

[0059] The frequency of the reciprocating motion of the connecting bar 309 is adjusted by adjusting the rotation speed of the variable speed motor 3, thereby adjusting the impact frequency of the impact assembly.

[0060] A mounting tube 4 is fixedly mounted on the base 1. The impact assembly is arranged in the mounting tube 4. The impact assembly is drivingly connected to the impact adjustment mechanism.

[0061] The impact assembly includes an impact hammer 413 and a hydraulic cylinder 402 .

[0062] The hydraulic cylinder 402 is fixedly arranged in the mounting tube 4. Specifically, two fixing rings 401 are fixedly arranged in the mounting tube 4. The fixing ring 401 includes a first ring segment and a second ring segment, and the first ring segment and the second ring segment are fixedly connected. The inner diameter of the first ring segment is smaller than the inner diameter of the second ring segment. The second ring segment is located on the inner side of the two fixing rings 401. A clamping groove 403 is provided on each of the two first ring segments, and a clamping block 404 that cooperates with the clamping groove 403 is fixedly arranged at both ends of the hydraulic cylinder 402. In this embodiment, each first ring segment has two clamping grooves 403, and the two clamping grooves 403 are symmetrically distributed. Two clamping blocks 404 are fixedly arranged at each end of the hydraulic cylinder 402, and the two clamping grooves 403 correspond one-to-one to the two clamping blocks 404. The hydraulic cylinder 402 is fixed in the mounting tube 4 by clamping the clamping block 404 into the corresponding clamping groove 403.

[0063] A baffle 407 is fixedly mounted in the hydraulic cylinder 402. A connecting hole 408 is formed in the baffle 407. The baffle 407 divides the hydraulic cylinder 402 into a first hydraulic chamber 405 and a second hydraulic chamber 406. The first hydraulic chamber 405 and the second hydraulic chamber 406 are connected via the connecting hole 408.

[0064] A first piston plate 409 is sealingly and slidably engaged within the first hydraulic chamber 405. A first piston rod 410 is fixedly mounted to the first piston plate 409. The end of the first piston rod 410, distal from the first piston plate 409, extends out of the hydraulic cylinder 402 and is fixedly connected to the connecting bar 309. As the first piston plate 409 slides, the volume of the first hydraulic chamber 405 changes.

[0065] A second piston plate 411 is sealingly and slidably engaged within the second hydraulic chamber 406. A second piston rod 412 is fixedly mounted on the second piston plate 411. The end of the second piston rod 412, which is away from the second piston plate 411, extends out of the hydraulic cylinder 402 and is fixedly connected to the impact hammer 413. When the second piston plate 411 moves, the volume of the second hydraulic chamber 406 changes.

[0066] The connecting bar 309 pushes the first piston plate 409 toward the baffle 407 via the first piston rod 410, causing the liquid in the first hydraulic chamber 405 to enter the second hydraulic chamber 406 through the connecting hole 408, and pushing the second piston plate 411 toward the drill bit assembly, thereby causing the impact hammer 413 to impact the drill bit assembly. When the connecting bar 309 moves toward the top block 202, the connecting bar 309 pulls the first piston plate 409 away from the baffle 407 via the first piston rod 410, reducing the pressure in the first hydraulic chamber 405. The liquid in the second hydraulic chamber 406 enters the first hydraulic chamber 405 through the connecting hole 408, causing the second piston plate 411 to move toward the baffle 407, thereby moving the impact hammer 413 away from the drill bit assembly, preparing for the next impact.

[0067] The impact frequency of the impact hammer 413 can be adjusted by adjusting the rotation speed of the variable speed motor 3, and the impact force of the impact hammer 413 can be adjusted by matching different incomplete gears with corresponding racks.

[0068] A bearing 414 is installed at one end of the mounting cylinder 4 away from the connecting strip 309, and the mounting cylinder 4 is rotatably connected to the sleeve 5 via the bearing 414. The drill bit assembly is slidably arranged in the sleeve 5.

[0069] The drill bit assembly includes a PDC drill bit 7 and a connecting shaft 6.

[0070] The connecting shaft 6 comprises a large-diameter section and a small-diameter section, which are fixedly connected. The PDC drill bit 7 is threadedly connected to the large-diameter section of the connecting shaft 6. A connecting groove 601 is axially defined in the small-diameter section of the connecting shaft 6. A fixing key 501 is fixedly mounted on the casing 5, and the connecting groove 601 and the fixing key 501 are slidably engaged.

[0071] Preferably, one end of the PDC drill bit 7 is tapered and provided with a thread. The large diameter section of the connecting shaft 6 is provided with a threaded hole that cooperates with the thread. This connection method can make the connection more secure and prevent the PDC drill bit 7 from falling off when subjected to a large impact force.

[0072] The torque adjustment mechanism includes a servo motor 509 and a transmission member. The servo motor 509 is connected to the casing 5 via the transmission member. The servo motor 509 drives the casing 5 to rotate through the transmission member, and then drives the PDC drill bit 7 to rotate through the connecting shaft 6.

[0073] The servo motor 509 is fixedly mounted on the carriage 2. By adjusting the rotation speed of the output end of the servo motor 509, the rotation speed of the sleeve 5 can be adjusted.

[0074] The transmission member includes a plurality of driving gears and a plurality of passive gears. The plurality of driving gears are matched with the plurality of passive gears in a one-to-one correspondence. The pitch circle diameters of the plurality of driving gears are not equal.

[0075] The driving gear is connected to the output shaft of the servo motor 509. The driven gear is coaxially fixedly mounted on the sleeve 5. At the same time, only one driving gear and the corresponding driven gear are in meshing state.

[0076] In this embodiment, there are two driving gears and two driven gears. For ease of description, the two driving gears are named the first driving gear 504 and the second driving gear 505, respectively. The two driven gears are named the second driven gear 503 of the first driven gear 502. The first driving gear 504 cooperates with the first driven gear 502. The second driving gear 505 cooperates with the second driven gear 503. When the first driving gear 504 is engaged with the first driven gear 502, the second driving gear 505 is disengaged from the second driven gear 503. Alternatively, when the second driving gear 505 is engaged with the second driven gear 503, the first driving gear 504 is disengaged from the first driven gear 502.

[0077] Specifically, a second sleeve 507 is fixedly mounted on the output shaft of the servo motor 509, and a second rotating shaft 506 is slidably fitted in the second sleeve 507. A plurality of second positioning holes are provided on the second rotating shaft 506, and a second through hole that cooperates with the second positioning holes is provided on the second sleeve 507. A second positioning pin 508 is provided in the second through hole. In this embodiment, there are two second positioning holes. The second rotating shaft 506 can be fixed to the second sleeve 507 by inserting the second positioning pin 508 into the second through hole and one of the second positioning holes in sequence. By matching the second through hole with different second positioning holes, the first driving gear 504 is meshed with the first driven gear 503 or the second driving gear 505 is meshed with the second driven gear 503. Different driving gears are meshed with corresponding driven gears to adjust the rotation speed of the casing 5. The torque of the casing 5 is then adjusted to achieve the purpose of adjusting the torque of the PDC drill bit 7.

[0078] The test machine further comprises a controller to which the control panel 103, the pressure sensor, the servo motor 509 and the variable speed motor 3 are all electrically connected.

[0079] Working principle:

[0080] First, install and debug the tester. Use the fixing block 102 to securely mount the tester in place. Install the PDC drill bit 7 to be tested onto the connecting shaft 6 via a threaded connection. Set the required output power and impact frequency via the control panel 103. (Adjust the drill bit's output power by adjusting the output power of the servo motor 509, and adjust the impact frequency of the impact hammer 413 by adjusting the speed of the variable speed motor 3.) By matching the first through hole with different first positioning holes 304, the first incomplete gear 305 matches the first rack 307, or the second incomplete gear 306 matches the second rack 308, thereby adjusting the impact force. By matching the second through hole with different second positioning holes, the first driving gear 504 matches the first driven gear 502, or the second driving gear 505 matches the second driven gear 503, thereby adjusting the speed and torque of the PDC drill bit 7. Set the predetermined value of the pressure sensor, and the electric telescopic rod 105 will adjust the telescopic length according to the predetermined pressure value. In this embodiment, for ease of description, it is assumed that the first incomplete gear 305 is engaged with the first rack 307, and the second incomplete gear 306 is disengaged from the second rack 308. The first driving gear 504 is engaged with the first driven gear 502, and the second driving gear 505 is disengaged from the second driven gear 503.

[0081] Then the servo motor 509 , the speed-changing motor 3 , and the electric telescopic rod 105 are started.

[0082] The servo motor 509 drives the second driving gear 505 to rotate by transmitting power to the first driving gear 504 , thereby driving the casing 5 to rotate, and further driving the PDC drill bit 7 to rotate.

[0083] At the same time, the electric telescopic rod 105 extends and pushes the carriage 2 toward the test rock, allowing the PDC drill bit 7 to drill the test rock. When the pressure sensor reaches a predetermined value, the electric telescopic rod 105 stops extending. The electric telescopic rod 105 adjusts its extension according to the pressure value of the pressure sensor to maintain a specific pressure on the PDC drill bit 7.

[0084] The variable speed motor 3 drives the first incomplete gear 305 and the second incomplete gear 306 to rotate via the first sleeve 301 and the first rotating shaft 302. When the first incomplete gear 305 is meshed with the first rack 307, the first incomplete gear 305 drives the first rack 307 toward the mounting cylinder 4, thereby causing the connecting bar 309 to move toward the mounting cylinder 4. The connecting bar 309 drives the first piston plate 409 toward the baffle 407 via the first piston rod 410, pushing the liquid in the first hydraulic chamber 405 into the second hydraulic chamber 406 through the connecting hole 408 and pushing the second piston plate 411 toward the drill bit assembly. The second piston plate 411 drives the impact hammer 413 via the second piston rod 412 to impact the connecting shaft 6, thereby impacting the PDC drill bit 7.

[0085] During this process, spring 310 is stretched, acquiring elastic potential energy. When first incomplete gear 305 disengages from first rack 307, spring 310 drives connecting bar 309 toward top block 202. Connecting bar 309, via first piston rod 410, pulls first piston plate 409 away from baffle 407. Liquid in second hydraulic chamber 406 enters first hydraulic chamber 405 through connecting hole 408. Second piston plate 411 moves toward baffle 407, moving hammer 413 away from the drill bit assembly, preparing for the next impact.

[0086] When the first incomplete gear 305 meshes with the first rack 307 again, the first incomplete gear 305 drives the first rack 307 to move toward the mounting barrel 4. The intermittent meshing of the first incomplete gear 305 and the first rack 307 causes the connecting bar 309 to perform reciprocating linear motion, thereby causing the impact hammer 413 to continuously impact the drill bit assembly.

[0087] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A fatigue impact damage testing machine, characterized in that: include: A base (1), a slide (2) is slidably provided on the base (1); a mounting tube (4) is fixedly provided on the slide (2); the mounting tube (4) is rotatably connected to a sleeve (5); the sleeve (5) is axially slidably connected to a drill assembly; an impact assembly is provided in the mounting tube (4); the impact assembly applies an impact force to the drill assembly; An electric telescopic rod (105), the electric telescopic rod (105) being fixedly mounted on the base (1), and the electric telescopic rod (105) being drivingly connected to the slide (2); An impact adjustment mechanism, the impact adjustment mechanism is drivingly connected to the impact assembly; the impact adjustment mechanism comprises a variable speed motor (3) fixed on the slide (2), a plurality of incomplete gears of different diameters, a plurality of racks slidably arranged on the slide, and a spring (310); the plurality of incomplete gears are matched with the plurality of racks in a one-to-one correspondence; at the same time, only one incomplete gear is in a meshing state with the corresponding rack; the incomplete gear is drivingly connected to the variable speed motor (3); the spring (310) abuts between an end of the slide (2) away from the drill assembly and the rack; A torque adjustment mechanism, the torque adjustment mechanism comprising a servo motor (509) fixed on a base and a transmission member; the servo motor (509) is in transmission connection with the sleeve (5) via the transmission member; A first sleeve (301) is fixedly mounted on the output shaft of the variable speed motor (3); a first rotating shaft (302) is slidably fitted in the first sleeve (301); a plurality of first positioning holes (304) are provided on the first rotating shaft (302); a first through hole is provided on the first sleeve (301) to fit with the first positioning hole (304); a first positioning pin (303) is fitted in the first through hole; The impact assembly includes an impact hammer (413) and a hydraulic cylinder (402); The hydraulic cylinder (402) is fixedly arranged in the mounting tube (4), a baffle (407) is fixedly arranged in the hydraulic cylinder (402), and a connecting hole (408) is opened on the baffle (407); the baffle (407) divides the hydraulic cylinder (402) into a first hydraulic chamber (405) and a second hydraulic chamber (406); A first piston plate (409) is sealingly and slidingly fitted in the first hydraulic chamber (405), a first piston rod (410) is fixedly mounted on the first piston plate (409), and an end of the first piston rod (410) away from the first piston plate (409) passes through the hydraulic cylinder (402) and is fixedly connected to the impact adjustment mechanism; A second piston plate (411) is sealingly and slidingly fitted in the second hydraulic chamber (406), a second piston rod (412) is fixedly provided on the second piston plate (411), and an end of the second piston rod (412) away from the second piston plate (411) passes through the hydraulic cylinder (402) and is fixedly connected to the impact hammer (413).

2. A fatigue impact damage testing machine according to claim 1, characterized in that: A support block (101) is fixed to one end of the base (1), and a top block (202) is fixed to one end of the slide (2) close to the support block (101); The electric telescopic rod (105) is fixedly mounted on the support block (101), and the output end of the electric telescopic rod (105) is fixedly connected to the top block (202); a pressure sensor is provided between the output end of the electric telescopic rod (105) and the top block (202).

3. The fatigue impact damage testing machine according to claim 1, characterized in that: The drill bit assembly comprises a PDC drill bit and a connecting shaft (6); the connecting shaft (6) comprises a large diameter section and a small diameter end, and the large diameter section and the small diameter section are fixedly connected; The PDC drill bit (7) is threadedly connected to the large diameter section of the connecting shaft (6); A connecting groove (601) is provided in the axial direction of the small-diameter end of the connecting shaft (6), a fixing key (501) is fixed on the sleeve (5), and the connecting groove (601) is in sliding engagement with the fixing key (501).

4. The fatigue impact damage testing machine according to claim 1, characterized in that: Two fixing rings (401) are fixedly provided in the installation cylinder (4); the fixing rings (401) include a first ring segment and a second ring segment, the first ring segment and the second ring segment being fixedly connected; the inner diameter of the first ring segment is smaller than the inner diameter of the second ring segment; the second ring segment is located inside the two fixing rings (401); A clamping groove (403) is provided on the first ring segment, and clamping blocks (404) that cooperate with the clamping groove (403) are fixedly provided at both ends of the hydraulic cylinder (402).

5. The fatigue impact damage testing machine according to claim 1, characterized in that: A bearing (414) is installed at one end of the mounting cylinder (4) close to the PDC drill bit (7), and the casing (5) is rotatably connected to the mounting cylinder (4) via the bearing (414).

6. The fatigue impact damage testing machine according to claim 1, characterized in that: The transmission member includes a plurality of driving gears and a plurality of passive gears; the plurality of driving gears are matched with the plurality of passive gears in a one-to-one correspondence; The driving gear is drivingly connected to the output shaft of the servo motor (509); the driven gear is fixedly mounted on the sleeve (5); At the same time, only one driving gear and the corresponding driven gear are in meshing state.

7. The fatigue impact damage testing machine according to claim 6, characterized in that: A second shaft sleeve (507) is fixedly mounted on the output shaft of the servo motor (509), and a second rotating shaft (506) is slidably fitted in the second shaft sleeve (507); a plurality of second positioning holes are provided on the second rotating shaft (506), a second through hole is provided on the second shaft sleeve (507), and a second positioning pin is fitted in the second through hole.

8. The fatigue impact damage testing machine according to claim 2, characterized in that: It also includes a controller; a control panel (103) is mounted on the support block (101); the control panel (103), the pressure sensor, the servo motor (509), and the variable speed motor (3) are all electrically connected to the controller.

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