Simulation experiment device for dynamic cyclic shear failure of NPR anchor cable

Abstract

The invention relates to the field of anchor cable performance testing, in particular to an NPR anchor cable dynamic cyclic shear failure simulation experiment device, and provides the following scheme aiming at the problems that a simulation experiment device in the prior art is inconvenient in force application direction change and inconvenient in test piece separation and closure: the simulation experiment device comprises a test board and a force application mechanism, the test board comprises a base, a mounting plate fixed on the top surface of the base, two material fixing mechanisms mounted on the top surface of the mounting plate and a test piece fixing mechanism, the two fixing mechanisms are respectively positioned on two sides of the test piece fixing mechanism, and one of the material fixing mechanisms is fixed on the top surface of the mounting plate; and the other material fixing mechanism is movably mounted on the top surface of the mounting plate through a sliding connection piece, and a first telescopic piece used for driving the material fixing mechanism to move is mounted on the top surface of the mounting plate. The force application direction can be conveniently adjusted, the two second test pieces and the first test piece can be conveniently folded or separated before testing, and operation of testers is facilitated.

Description

Technical Field

[0001] The invention relates to the field of anchor cable performance testing, in particular to a NPR anchor cable dynamic cyclic shear failure simulation experimental device. Background Art

[0002] At present, NPR anchor cables are widely used in coal mine tunnel support. In order to cope with the complex and changeable geological changes underground, extremely high requirements are placed on the performance of NPR anchor cables. Therefore, in the process of studying NPR anchor cables, it is necessary to conduct rigorous tests on their various performances.

[0003] At present, the super tensile performance of NPR anchor cables has been verified in actual support processes and indoor static tensile tests, but their shear resistance has not yet been scientifically verified. When measuring their shear resistance, the most effective method is to apply non-aligned forces to the anchor cables and then observe their deformation and fracture. However, this method also has some defects. During measurement, the direction of force cannot be changed conveniently and quickly, resulting in single measurement data. In addition, the separation and closing of concrete specimens require manual operation, which is not convenient and prone to errors. For this reason, this scheme proposes a dynamic cyclic shear failure simulation experimental device for NPR anchor cables. Summary of the invention

[0004] The NPR anchor cable dynamic cyclic shear failure simulation experimental device proposed by the present invention solves the problems of inconvenient force direction change and inconvenient separation and closing of test pieces in the simulation experimental device in the prior art.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] The NPR anchor cable dynamic cyclic shear failure simulation experimental device comprises a test bench and a force-applying mechanism, wherein the test bench comprises a base, a mounting plate fixed on the top surface of the base, two material fixing mechanisms and a specimen fixing mechanism installed on the top surface of the mounting plate, wherein the two fixing mechanisms are respectively located on both sides of the specimen fixing mechanism, and one of the material fixing mechanisms is fixed on the top surface of the mounting plate, and the other material fixing mechanism is movably installed on the top surface of the mounting plate through a sliding member, wherein the top surface of the mounting plate is provided with a first telescopic member for driving the material fixing mechanism to move;

[0007] The specimen fixing mechanism comprises a specimen placement assembly and two specimen fixing assemblies respectively located on both sides of the specimen placement assembly, wherein the specimen placement assembly comprises a screw rod rotatably connected to the top surface of the mounting plate, a screw sleeve threadedly sleeved on the outside of the top end of the screw rod, a support plate fixed to the top surface of the screw sleeve, and a stopper installed between the screw sleeve and the mounting plate;

[0008] The specimen fixing assembly comprises a fixing rod mounted on the top surface of the mounting plate through an elastic member, a fixing tube fixed on the top of the fixing rod, a plurality of locking bolts mounted on the outer periphery of the fixing tube, and an abutting rod fixed on a side of the fixing rod close to the specimen placing assembly, and a through hole is formed on a side of the fixing tube away from the specimen placing assembly;

[0009] The top surface of the mounting plate is also provided with a driving mechanism for driving the screw rod to rotate, and the driving mechanism cooperates with the abutment rod to drive the abutment rod to move when the driving screw rod rotates;

[0010] The force applying mechanism comprises an outer ring fixed on the top of the base and a force applying member movably mounted on the inner ring of the outer ring and rotatable along the inner ring of the outer ring, and the test bench is arranged through the inner ring of the outer ring.

[0011] Through the above technical scheme, not only can the direction of force application be easily adjusted, so that the anchor cable specimen can be cyclically forced from different directions, but also the two second specimens can be conveniently closed at both ends of the first specimen before the test, and the two second specimens can be conveniently separated from the first specimen after the test, which facilitates the operation of the tester.

[0012] As a further improvement of the above scheme, the force-applying member includes an inner ring rotatably sleeved on the inner ring of the outer ring, a hydraulic cylinder installed on the inner ring of the inner ring, and an adjusting member installed on the outer ring for driving the inner ring to rotate, and the inner ring is arranged opposite to the specimen placement assembly, and a pressure plate is fixed to the output end of the hydraulic cylinder.

[0013] Through the above technical solution, the direction of force application can be adjusted by rotating the inner ring.

[0014] As a further improvement of the above solution, the inner ring of the outer ring is provided with a slide groove coaxially arranged therewith, the outer ring of the inner ring is sleeved with a connecting ring coaxially arranged therewith, and the outer ring of the connecting ring is engaged in the slide groove and slidably connected therewith.

[0015] Through the above technical solution, the connecting ring can stably rotate inside the outer ring.

[0016] As a further improvement of the above scheme, a plurality of tooth grooves are evenly opened on the side of the inner ring, and the adjusting member includes a transmission motor installed on the side wall of the outer ring and a transmission gear sleeved on the outside of the output shaft of the transmission motor, and the transmission gear is meshed with the tooth grooves on the side of the inner ring.

[0017] Through the above technical solution, the inner ring can be driven to rotate by the rotation of the motor.

[0018] As a further improvement of the above-mentioned scheme, the driving mechanism includes a fixed frame arranged on the top surface of the mounting plate, a rack fixed on the inner wall of the long side of one side of the fixed frame, and a second telescopic member installed on the top surface of the mounting plate, the fixed frame is a rectangular structure with a notch on one short side, the output end of the second telescopic member is fixedly connected to the short side of the fixed frame, and the outer periphery of the screw is sleeved with a fixed gear meshing with the rack.

[0019] Through the above technical solution, the support plate can be driven to move up and down by driving the fixed frame to move.

[0020] As a further improvement of the above scheme, a mounting groove for installing an elastic member is provided on the top surface of the mounting plate, and the elastic member includes a sleeve rod fixed inside the mounting groove along the length direction of the mounting groove and a spring movably sleeved on the outer periphery of the sleeve rod, the bottom of the fixed rod extends into the mounting groove and is movably sleeved on the outer periphery of the sleeve rod, one end of the spring is fixedly connected to the fixed rod, and the other end of the spring is fixedly connected to the inner wall of the mounting groove, one end of the long sides of both sides of the fixed frame are right-angled triangle structures, and the inclined surfaces face outward, and the abutment rod abuts against the outer side wall of the long side of the fixed frame.

[0021] Through the above technical solution, the specimen fixing part can be moved closer to or farther away from the specimen placing part under the action of the fixing frame.

[0022] As a further improvement of the above scheme, the material fixing mechanism includes a fixed block, a fixed shaft rotatably connected to the top surface of the fixed block, a wire taking-up drum fixed to the top surface of the fixed shaft, a locking member installed on the top surface of the wire taking-up drum and a transmission member installed on the top surface of the fixed block for driving the fixed shaft to rotate, the outer ring of the wire taking-up drum is provided with a fixing hole arranged along its radial direction, and the fixing hole is aligned with the through hole, a fixed block in one of the material fixing mechanisms is fixed to the top surface of the mounting plate, and a fixed block in another material fixing mechanism is fixedly connected to the output end of the first telescopic member, the locking member includes a fixing bolt rotatably connected to the top surface of the wire taking-up drum and a disc fixed to the top of the fixing bolt, the bottom of the fixing bolt extends into the fixing hole, and a toggle column is fixed to the outer periphery of the disc.

[0023] Through the above technical solution, one end of the anchor cable can be fixed in the fixing hole to complete the fixation of the anchor cable. Then, when the anchor cable is pulled out from the first specimen or the second specimen, the anchor cable can be reeled in by rotating the take-up reel, thereby achieving the purpose of facilitating the extraction of the anchor cable.

[0024] As a further improvement of the above scheme, the transmission member includes a fixed plate fixed on the top surface of the fixed block, a rotating shaft rotatably connected to the fixed plate, and an adjusting disk fixed at one end of the rotating shaft. The other end of the rotating shaft is transmission-connected to the fixed shaft, and the adjusting disk is rotatably connected to a handle at a position deviating from the center of a circular surface on one side away from the rotating shaft.

[0025] Through the above technical solution, the fixed shaft can be driven to rotate conveniently and labor-savingly.

[0026] As a further improvement of the above scheme, a guide groove for installing a sliding member is provided on the top surface of the mounting plate, and the sliding member includes a guide rod fixed inside the guide groove along the length direction and a slider movably mounted on the outer periphery of the guide rod, and the top of the slider is fixed to the bottom surface of the fixed block fixed to the output end of the first telescopic member.

[0027] Through the above technical solution, the fixed block connected to the sliding block can be stably moved on the top surface of the mounting plate under the drive of the first telescopic member.

[0028] As a further improvement of the above scheme, the limiting member includes a limiting column fixed on the top surface of the mounting plate and a limiting block movably mounted on the outer periphery of the limiting column. The limiting column is arranged along the axial direction of the screw, and one end of the limiting block is fixedly connected to the outer periphery of the screw sleeve.

[0029] Through the above technical solution, the screw sleeve can be prevented from rotating with the screw sleeve, so that the screw sleeve can only move along the axial direction of the screw.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. Through the cooperation between the specimen placement component, the two specimen fixing components and the driving mechanism, the two second specimens can be automatically closed at the two ends of the first specimen while the support plate is driven to descend, thereby preventing the support plate from blocking the movement of the first specimen when the first specimen is subjected to shear force. After the test, the two second specimens can be separated from the first specimen while the support plate is driven up, so that the first specimen can be supported to prevent the first specimen from falling on the mounting plate after the anchor cable is pulled out of the first specimen. At the same time, the setting of the support plate can also support the first specimen before the anchor cable is tightened, so that the first specimen and the second specimen can be closed more accurately.

[0032] 2. Through the setting of the material fixing mechanism, not only can the two ends of the anchor cable be fixed conveniently, but also the anchor cable can be easily and labor-savingly pulled out from the first test piece and the second test piece after the test.

[0033] 3. Through the setting of the force-applying mechanism, the direction of the force can be easily adjusted, so that pressure can be applied to the anchor cable cycle from different directions according to the needs of the test, thereby obtaining more accurate performance data. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a perspective view of the left side of the present invention;

[0035] Figure 2 It is a stereogram of the right side of the present invention;

[0036] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0037] Figure 4 is a structural schematic diagram of a force-applying mechanism;

[0038] Figure 5 This is a schematic diagram of the structure from the front of the test bench;

[0039] Figure 6 It is a structural schematic diagram of the back side of the test bench;

[0040] Figure 7 This is a schematic diagram of the structure of the test bench after the anchor cable is fixed;

[0041] Figure 8 It is a schematic diagram of the structure of the test bench when the two first test pieces and the second test piece are closed.

[0042] Description of main symbols:

[0043] 1. Base; 2. Outer ring; 3. Mounting plate; 4. Inner ring; 5. Fixed cylinder; 6. Fixed frame; 7. Material fixing mechanism; 701. Adjusting plate; 702. Rotating shaft; 703. Fixed shaft; 704. Wire take-up reel; 705. Locking piece; 706. Handle; 707. Fixed hole; 708. Fixed plate; 8. Through hole; 9. Fixed block; 10. Transmission motor; 11. First telescopic piece; 12. Hydraulic cylinder; 13. Press plate; 14 , support plate; 15, limit block; 16, rack; 17, limit column; 18, screw; 19, fixed gear; 20, abutment rod; 21, fixed rod; 22, second telescopic member; 23, screw sleeve; 24, connecting ring; 25, slide groove; 26, transmission gear; 27, locking bolt; 28, sleeve rod; 29, guide groove; 30, guide rod; 31, installation groove; 32, first test piece; 33, second test piece; 34, anchor cable. DETAILED DESCRIPTION

[0044] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0045] Embodiment 1:

[0046] Please combine Figure 1 - Figure 8The NPR anchor cable dynamic cyclic shear failure simulation experimental device of this embodiment includes a test bench and a force-applying mechanism. The test bench includes a base 1, a mounting plate 3 fixed on the top surface of the base 1, two solid material mechanisms 7 installed on the top surface of the mounting plate 3, and a specimen fixing mechanism. The two fixing mechanisms 7 are respectively located on both sides of the specimen fixing mechanism, and one of the solid material mechanisms 7 is fixed on the top surface of the mounting plate 3, and the other solid material mechanism 7 is movably installed on the top surface of the mounting plate 3 through a sliding member. A first telescopic member 11 for driving the solid material mechanism to move is installed on the top surface of the mounting plate 3. The first telescopic member 11 is an oil cylinder. The two ends of the anchor cable to be tested are respectively fixed in the two solid material mechanisms 7, and then the first telescopic member 11 is started to extend, so that the anchor cable can be straightened and tightened.

[0047] The specimen fixing mechanism includes a specimen placement component and two specimen fixing components respectively located on both sides of the specimen placement component. The specimen placement component includes a screw 18 rotatably connected to the top surface of the mounting plate 3, a screw sleeve 23 threadedly sleeved on the outside of the top end of the screw 18, a support plate 14 fixed to the top surface of the screw sleeve 23, and a limiter installed between the screw sleeve 23 and the mounting plate 3. The limiter includes a limit column 17 fixed to the top surface of the mounting plate 3 and a limit block 15 movably sleeved on the outer periphery of the limit column 17. The limit column 17 is arranged along the axial direction of the screw 18, one end of the limit block 15 is fixedly connected to the outer periphery of the screw sleeve 23, and the limiter The arrangement ensures that the screw sleeve 23 does not rotate when the screw rod 18 rotates, but can only move along the axial direction of the screw rod 18, so that the support plate 14 can be driven to rise and fall by driving the screw rod 18 to rotate. Before testing, the first test piece 32 can be placed on the support plate 14 to prevent the first test piece 32 from sagging due to its own gravity. After the anchor cable is tightened, the height of the support plate 14 can be lowered to prevent it from affecting the movement of the first test piece 32. After the test, the support plate 14 can be raised again so that it can support the first test piece 32 during the process of pulling out the anchor cable to prevent it from falling.

[0048] The specimen fixing assembly includes a fixing rod 21 installed on the top surface of the mounting plate 3 through an elastic member, a fixing tube 5 fixed on the top of the fixing rod 21, a plurality of locking bolts 27 installed on the outer periphery of the fixing tube 5, and an abutment rod 20 fixed on the fixing rod 21 on the side close to the specimen placing assembly. A through hole 8 is provided on the side of the fixing tube 5 away from the specimen placing assembly. The through hole 8 is provided for the passage of the anchor cable, and the inner side of the fixing tube 5 is used to fix the second specimen 33. After the second specimen 33 is placed into the fixing tube 5, the locking bolt 27 is tightened, and the second specimen 33 is pressed tightly inside the fixing tube 5 by the locking bolt 27.

[0049] The top surface of the mounting plate 3 is also provided with a driving mechanism for driving the screw 18 to rotate, and the driving mechanism cooperates with the abutment rod 20 to drive the abutment rod 20 to move when the driving screw 18 rotates. The driving mechanism includes a fixed frame 6 arranged on the top surface of the mounting plate 3, a rack 16 fixed on the inner wall of the long side of one side of the fixed frame 6, and a second telescopic member 22 installed on the top surface of the mounting plate 3. The fixed frame 6 is a rectangular structure with a notch on one short side. The output end of the second telescopic member 22 is fixedly connected to the short side of the fixed frame 6. The outer periphery of the screw 18 is sleeved with a fixed gear 19 meshing with the rack 16. The second telescopic member 22 is an electric telescopic rod. When the second telescopic member 22 is extended, the fixed frame 6 is driven to move forward. At this time, the rack 16 drives the fixed gear 19 to rotate forward, and the screw 18 also rotates forward. At this time, the screw sleeve 23 descends, thereby driving the support plate 14 to descend. On the contrary, when the second telescopic member 22 contracts, the screw sleeve 23 can be driven to rise, thereby driving the support plate 14 to also rise.

[0050] The top surface of the mounting plate 3 is provided with a mounting groove 31 for installing an elastic member. The elastic member includes a sleeve rod 28 fixed inside the mounting groove 31 along the length direction of the mounting groove 31 and a spring movably sleeved on the outer periphery of the sleeve rod 28. The bottom of the fixing rod 21 extends into the mounting groove 31 and is movably sleeved on the outer periphery of the sleeve rod 28. One end of the spring is fixedly connected to the fixing rod 21, and the other end of the spring is fixedly connected to the inner wall of the mounting groove 31. One end of the long sides of both sides of the fixing frame 6 is a right-angled triangle structure, and the inclined surface faces outward, and the abutting rod 20 abuts against the outer side wall of the long side of the fixing frame 6. When the two second test pieces 33 are closed at the two ends of the first test piece 32, the spring is in a stretched state, and the support plate 14 is located below the fixing tube 5. When not tested, the two test piece fixing components will be close to the test piece placement component under the action of the spring. The fixing tube 5 is in a close state, at which time the top surface height of the support plate 14 is also flush with the bottom surface height of the inner ring of the fixing tube 5. The setting of the elastic member allows the fixing rod 21 to move along the length direction of the mounting groove, and makes one end of the abutting rod 20 always abut against the outer wall of the long side of the fixing frame 6. When the abutting rod 20 contacts the non-inclined area of ​​the long side of the fixing frame 6, the position of the fixing rod 21 remains unchanged when the fixing frame 6 moves, and when the abutting rod 20 contacts the inclined area of ​​the fixing frame 6, the fixing rod 21 and the fixing tube 5 will move away from the specimen placement assembly when the fixing frame 6 moves forward, and when the fixing frame 6 moves backward, the fixing tube 5 will move closer to the specimen placement assembly, thereby achieving the purpose of automatically driving the specimen fixing assembly to move closer to or farther from the specimen placement assembly, and then the closing and separation of the first specimen 32 and the second specimen 33 can be easily completed.

[0051] The force-applying mechanism includes an outer ring 2 fixed on the top of the base 1 and a force-applying member movably installed on the inner ring of the outer ring 2 and rotatable along the inner ring of the outer ring 2. The test bench is arranged through the inner ring of the outer ring 2. The force-applying member includes an inner ring 4 rotatably sleeved on the inner ring of the outer ring 2, a hydraulic cylinder 12 installed on the inner ring of the inner ring 4, and an adjusting member installed on the outer ring 2 for driving the inner ring 4 to rotate, and the inner ring 4 is arranged opposite to the test piece placement assembly. A pressure plate 13 is fixed to the output end of the hydraulic cylinder 12. A slide groove 25 coaxially arranged therewith is provided on the inner ring of the outer ring 2. A connecting ring 24 coaxially arranged therewith is sleeved on the outer ring 4. The outer ring of the connecting ring 24 is clamped in the slide groove 25 and slidably connected thereto. A plurality of tooth grooves are evenly arranged on the side of the inner ring 4. The adjusting member includes a transmission motor 10 installed on the side wall of the outer ring 2 and a transmission motor sleeved on the transmission motor The transmission gear 26 on the outside of the output shaft of the machine 10 is meshed with the tooth groove on the side of the inner ring 4. When the hydraulic cylinder 12 is extended, it will drive the pressure plate 13 to approach the first test piece 32. When the pressure plate 13 contacts the first test piece, a shear force can be formed between the first test piece 32 and the second test piece 33. The shear force acts on the anchor cable, and then the pressure applied to the first test piece 32 and the displacement of the first test piece 32 are observed. Then, the deformation data of the NPR anchor cable caused by the shear force is calculated according to the pressure size and displacement changes. When the transmission motor 10 rotates, it can drive the inner ring 4 to rotate, so that the position of the hydraulic cylinder 12 can be adjusted, and then the first test piece 32 can be applied from different directions, so that the anchor cable can be cyclically applied from different directions.

[0052] The implementation principle of this embodiment is: during the test, the first test piece 32 and the two second test pieces 33 are passed through the outer periphery of the anchor cable 34, and the two second test pieces 34 are located on both sides of the first test piece 32, and then the two second test pieces 33 are respectively placed in the fixing tubes of the two test piece fixing assemblies, and then the locking bolts 27 are tightened to clamp the second test pieces 33, and then the first test piece 32 is placed on the support plate 14, and then the two ends of the anchor cable are respectively fixed on the two fixing mechanisms, and then the anchor cable is tightened;

[0053] Next, the two second test pieces 33 are closed at both ends of the first test piece 32. During the operation, the second telescopic member 22 is first started to contract, thereby driving the fixed frame 6 to move backward. At this time, the rack 16 drives the screw 18 to rotate forward, the screw sleeve 23 and the support plate 14 descend, and the support plate moves away from the first test piece 32. When the abutment rod 20 contacts the inclined area of ​​the fixed frame 6, it will gradually approach between the test pieces during the process of the fixed frame 6 continuing to move backward, until the second test piece 33 abuts against one end of the first test piece 32, thereby completing the closing of the first test piece 32 and the second test piece 33. When the first test piece 32 and the second test piece 33 are closed, The force-applying mechanism can be started to apply pressure to the first test piece 32. At this time, the hydraulic cylinder 12 extends, driving the pressure plate 13 to approach the first test piece 32. When the pressure plate 13 contacts the first test piece, a shear force can be formed between the first test piece 32 and the second test piece 33. The shear force acts on the anchor cable. Then, the pressure applied to the first test piece 32 and the displacement of the first test piece 32 are observed. Then, the deformation data of the NPR anchor cable caused by the shear force is calculated according to the pressure and displacement changes. When the force-applying direction needs to be adjusted, the transmission motor 10 can be started to drive the inner ring 4 to rotate.

[0054] After the test is completed, the second telescopic member 22 is started to extend, thereby driving the fixed frame 6 and the rack 16 to move forward, the screw rod 18 is reversed, and the screw sleeve 23 and the support plate 14 move up until the support plate 14 contacts the first test piece 32, so that the first test piece 32 can be supported. In the process of the fixed frame 6 moving forward, the abutment rod 20 will move to the side away from the test piece placement assembly under the pressure of the inclined surface of the fixed frame 6, so that the second test piece 33 is separated from the first test piece 32, until the abutment column 20 moves to the non-inclined area of ​​the fixed frame 6, the abutment rod 20 and the fixed tube will no longer move, and then the first test piece 32 and the second test piece 33 can be removed from the anchor cable.

[0055] Embodiment 2:

[0056] Combination Figure 1 - Figure 2 and Figure 5 - Figure 8, based on the embodiment 1, the present embodiment is further improved in that: the material fixing mechanism 7 includes a fixed block 9, a fixed shaft 703 rotatably connected to the top surface of the fixed block 9, a take-up drum 704 fixed to the top surface of the fixed shaft 703, a locking member 705 installed on the top surface of the take-up drum 704 and a transmission member installed on the top surface of the fixed block 9 for driving the fixed shaft 703 to rotate, the outer ring of the take-up drum 704 is provided with a fixing hole 707 arranged along its radial direction, and the fixing hole 707 is aligned with the through hole 8, the fixed block 9 in one of the material fixing mechanisms 7 is fixed to the top surface of the mounting plate 3, and the fixed block 9 in the other material fixing mechanism 7 is fixedly connected to the output end of the first telescopic member 11, the locking member 705 includes a fixing bolt rotatably connected to the top surface of the take-up drum 704 and a fixing bolt fixed to the top surface of the take-up drum 704. The disc on the top of the fixing bolt, the bottom of the fixing bolt extends into the fixing hole 707, the outer periphery of the disc is fixed with a toggle column, the top surface of the mounting plate 3 is provided with a guide groove 29 for installing a sliding member, the sliding member includes a guide rod 30 fixed inside the guide groove 29 along the length direction and a slider movably sleeved on the outer periphery of the guide rod 30, the top of the slider is fixed to the bottom surface of the fixing block 9 fixed to the output end of the first telescopic member 11, when fixing the anchor cable, one end of the anchor cable is inserted into the fixing hole 707, and then the fixing bolt is tightened, and the fixing bolt is used to press on the anchor cable, so that the anchor cable is stuck in the fixing hole 707, so that the anchor cable can be fixed, and the setting of the sliding member enables the fixing block 9 connected to the slider to stably slide on the top surface of the mounting plate 3.

[0057] The transmission member includes a fixed plate 708 fixed to the top surface of the fixed block 9, a rotating shaft 702 rotatably connected to the fixed plate 708, and an adjusting disk 701 fixed to one end of the rotating shaft 702. A driving bevel gear is fixed to the other end of the rotating shaft 702. A driven bevel gear meshing with the driving bevel gear is sleeved on the outer periphery of the fixed shaft 703. A handle 706 is rotatably connected to the adjusting disk 701 at a position deviating from the center of a circular surface on one side away from the rotating shaft 702. The setting of the handle 706 makes the rotation of the adjusting disk 701 more convenient and labor-saving. After the test is completed, the fixed shaft 703 can be driven to rotate by rotating the rotating shaft 702. After the fixed shaft 703 rotates, the anchor cable can be gradually wound on the take-up drum 704, so that the anchor cable can be conveniently and labor-savingly pulled out of the first test piece 32 or the second test piece 3.

[0058] The implementation principle of this embodiment is: when the anchor cable breaks, the test is completed, and the first test piece 32 and the second test piece 33 need to be removed from the anchor cable. Since the anchor cable may be deformed, it will be more difficult to remove the first test piece 32 and the second test piece 33. At this time, you only need to hold the handle 706 and rotate it, thereby driving the rotating shaft 702 to rotate. After the rotating shaft 702 rotates, it drives the take-up drum 704 to rotate, and then the anchor cable can be rolled up on the take-up drum 704, so that the anchor cable can be easily and labor-savingly pulled out from the first test piece 32 or the second test piece 3.

[0059] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. The NPR anchor cable dynamic cyclic shear failure simulation experimental device includes a test bench and a force-applying mechanism, and is characterized in that: The test bench comprises a base, a mounting plate fixed on the top surface of the base, two material fixing mechanisms and a specimen fixing mechanism installed on the top surface of the mounting plate, the two fixing mechanisms are respectively located on both sides of the specimen fixing mechanism, and one of the material fixing mechanisms is fixed on the top surface of the mounting plate, and the other material fixing mechanism is movably installed on the top surface of the mounting plate through a sliding member, and a first telescopic member for driving the material fixing mechanism to move is installed on the top surface of the mounting plate; The specimen fixing mechanism comprises a specimen placement assembly and two specimen fixing assemblies respectively located on both sides of the specimen placement assembly, wherein the specimen placement assembly comprises a screw rod rotatably connected to the top surface of the mounting plate, a screw sleeve threadedly sleeved on the outside of the top end of the screw rod, a support plate fixed to the top surface of the screw sleeve, and a stopper installed between the screw sleeve and the mounting plate; The specimen fixing assembly comprises a fixing rod mounted on the top surface of the mounting plate through an elastic member, a fixing tube fixed on the top of the fixing rod, a plurality of locking bolts mounted on the outer periphery of the fixing tube, and an abutting rod fixed on a side of the fixing rod close to the specimen placing assembly, and a through hole is formed on a side of the fixing tube away from the specimen placing assembly; The top surface of the mounting plate is also provided with a driving mechanism for driving the screw rod to rotate, and the driving mechanism cooperates with the abutment rod to drive the abutment rod to move when the driving screw rod rotates; The force applying mechanism comprises an outer ring fixed on the top of the base and a force applying member movably mounted on the inner ring of the outer ring and rotatable along the inner ring of the outer ring, and the test bench is arranged through the inner ring of the outer ring.

2. The NPR anchor cable dynamic cyclic shear failure simulation experimental device according to claim 1 is characterized in that: The force-applying member includes an inner ring rotatably sleeved on the inner ring of the outer ring, a hydraulic cylinder installed on the inner ring of the inner ring, and an adjusting member installed on the outer ring for driving the inner ring to rotate, and the inner ring is arranged opposite to the specimen placement assembly, and a pressure plate is fixed to the output end of the hydraulic cylinder.

3. The NPR anchor cable dynamic cyclic shear failure simulation experimental device according to claim 2 is characterized in that: The inner ring of the outer ring is provided with a sliding groove coaxially arranged therewith, the outer ring of the inner ring is sleeved with a connecting ring coaxially arranged therewith, and the outer ring of the connecting ring is engaged in the sliding groove and slidably connected therewith.

4. The NPR anchor cable dynamic cyclic shear failure simulation experimental device according to claim 2 is characterized in that: The side surface of the inner ring is evenly provided with a plurality of tooth grooves. The adjusting member comprises a transmission motor mounted on the side wall of the outer ring and a transmission gear sleeved on the outside of the output shaft of the transmission motor. The transmission gear meshes with the tooth grooves on the side surface of the inner ring.

5. The NPR anchor cable dynamic cyclic shear failure simulation experimental device according to claim 1 is characterized in that: The driving mechanism includes a fixed frame arranged on the top surface of the mounting plate, a rack fixed on the inner wall of the long side of one side of the fixed frame, and a second telescopic member installed on the top surface of the mounting plate. The fixed frame is a rectangular structure with a notch on one short side. The output end of the second telescopic member is fixedly connected to the short side of the fixed frame, and the outer periphery of the screw is sleeved with a fixed gear meshing with the rack.

6. The NPR anchor cable dynamic cyclic shear failure simulation experimental device according to claim 1 is characterized in that: The top surface of the mounting plate is provided with a mounting groove for installing an elastic member, and the elastic member includes a sleeve rod fixed inside the mounting groove along the length direction of the mounting groove and a spring movably sleeved on the outer periphery of the sleeve rod, the bottom of the fixed rod extends into the mounting groove and is movably sleeved on the outer periphery of the sleeve rod, one end of the spring is fixedly connected to the fixed rod, and the other end of the spring is fixedly connected to the inner wall of the mounting groove, one end of the long sides of both sides of the fixed frame are right-angled triangle structures, and the inclined surface faces outward, and the abutment rod abuts against the outer side wall of the long side of the fixed frame.

7. The NPR anchor cable dynamic cyclic shear failure simulation experimental device according to claim 1 is characterized in that: The material fixing mechanism includes a fixed block, a fixed shaft rotatably connected to the top surface of the fixed block, a wire take-up drum fixed to the top surface of the fixed shaft, a locking member installed on the top surface of the wire take-up drum, and a transmission member installed on the top surface of the fixed block for driving the fixed shaft to rotate. The outer ring of the wire take-up drum is provided with a fixing hole arranged along its radial direction, and the fixing hole is aligned with the through hole. A fixed block in one of the material fixing mechanisms is fixed to the top surface of the mounting plate, and a fixed block in another material fixing mechanism is fixedly connected to the output end of the first telescopic member. The locking member includes a fixing bolt rotatably connected to the top surface of the wire take-up drum and a disc fixed on the top of the fixing bolt. The bottom of the fixing bolt extends into the fixing hole, and a toggle column is fixed to the outer periphery of the disc.

8. The NPR anchor cable dynamic cyclic shear failure simulation experimental device according to claim 7 is characterized in that: The transmission member includes a fixed plate fixed on the top surface of the fixed block, a rotating shaft rotatably connected to the fixed plate, and an adjusting disk fixed at one end of the rotating shaft. The other end of the rotating shaft is transmission-connected to the fixed shaft. A handle is rotatably connected to a circular surface on one side of the adjusting disk away from the rotating shaft at a position deviating from the center of the circle.

9. The NPR anchor cable dynamic cyclic shear failure simulation experimental device according to claim 7, characterized in that: The top surface of the mounting plate is provided with a guide groove for installing a sliding member, and the sliding member includes a guide rod fixed inside the guide groove along the length direction and a slider movably mounted on the outer circumference of the guide rod, and the top of the slider is fixed to the bottom surface of the fixed block fixed to the output end of the first telescopic member.

10. The NPR anchor cable dynamic cyclic shear failure simulation experimental device according to claim 1, characterized in that: The limiting member comprises a limiting column fixed on the top surface of the mounting plate and a limiting block movably sleeved on the outer periphery of the limiting column. The limiting column is arranged along the axial direction of the screw rod, and one end of the limiting block is fixedly connected to the outer periphery of the screw sleeve.

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