Simulation experiment device for dynamic cyclic shearing failure of npr anchor cable

Abstract

The present application relates to the field of anchor cable performance testing, especially to a NPR anchor cable dynamic cyclic shear failure simulation experiment device, and aims at the problems of inconvenient force direction transformation, separate test pieces and inconvenient folding of the prior art simulation experiment device, and proposes the following scheme, which comprises a test table and a force applying mechanism, the test table comprises a base, a mounting plate fixed on the top surface of the base, two fixed material mechanisms and a test piece fixing mechanism mounted on the top surface of the mounting plate, the two fixed mechanisms are respectively located on the two sides of the test piece fixing mechanism, one of the fixed material mechanisms is fixed on the top surface of the mounting plate, and the other fixed material mechanism is movably mounted on the top surface of the mounting plate through a sliding piece, and the top surface of the mounting plate is provided with a first telescopic piece for driving the fixed material mechanism to move. The present application can not only conveniently adjust the direction of the force, but also conveniently fold or separate the two second test pieces from the first test piece before testing, which facilitates the operation of the tester.

Description

TECHNICAL FIELD

[0001] The application relates to the field of anchor cable performance testing, in particular to an NPR anchor cable dynamic cyclic shearing failure simulation experiment device. BACKGROUND

[0002] At present, the NPR anchor cable is widely used in coal mine roadway support, and the performance of the NPR anchor cable is highly required for coping with complex and changeable underground geological changes, so that the performance of the NPR anchor cable needs to be strictly tested in the research process.

[0003] At present, the super tensile performance of the NPR anchor cable is verified in the actual supporting process and the indoor static tensile test, but the shearing capacity has not been scientifically verified, and the most effective way for measuring the shearing capacity is to apply a misaligned force to the anchor cable and then observe the deformation and fracture, but the method has some defects, that is, the force direction cannot be conveniently and quickly changed during measurement, so that the measurement data is single, and in addition, the separation and closing of the concrete test piece need to be manually operated, which is not convenient and is prone to errors. SUMMARY

[0004] The NPR anchor cable dynamic cyclic shearing failure simulation experiment device provided by the application solves the problems of inconvenient force direction change of the simulation experiment device in the prior art and inconvenient separation and closing of the test piece.

[0005] In order to achieve the above purpose, the application adopts the following technical scheme:

[0006] The NPR anchor cable dynamic cyclic shearing failure simulation experiment device comprises a test table and a force applying mechanism, the test table comprises a base, a mounting plate fixed on the top surface of the base, two fixed material mechanisms and a test piece fixing mechanism mounted on the top surface of the mounting plate, the two fixed mechanisms are respectively located on the two sides of the test piece fixing mechanism, one of the fixed material mechanisms is fixed on the top surface of the mounting plate, and the other fixed material mechanism is movably mounted on the top surface of the mounting plate through a sliding piece, and the top surface of the mounting plate is provided with a first telescopic piece for driving the fixed material mechanism to move;

[0007] The test piece fixing mechanism comprises a test piece placing assembly and two test piece fixing assemblies respectively located on the two sides of the test piece placing assembly, the test piece placing assembly comprises a screw rod rotatably connected to the top surface of the mounting plate, a screw sleeve screwed on the outer top end of the screw rod, a supporting plate fixed on the top surface of the screw sleeve and a limiting piece mounted between the screw sleeve and the mounting plate;

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

[0009] The top surface of the mounting plate is further provided with a driving mechanism for driving the screw rod to rotate, and the driving mechanism cooperates with the abutting rod to drive the abutting rod to move when the 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 in the inner ring of the outer ring and rotatable along the inner ring of the outer ring, and the test bench passes through the inner ring of the outer ring.

[0011] Through the above technical scheme, the direction of the force can be conveniently adjusted, so that the anchor cable test piece can be conveniently subjected to cyclic force from different directions, and the two second test pieces can be conveniently folded at the two ends of the first test piece before testing, and the two second test pieces can be conveniently separated from the first test piece after testing, which facilitates the operation of the test personnel.

[0012] As a further improvement of the above scheme, the force applying member comprises an inner ring rotatably sleeving the inner ring of the outer ring, a hydraulic cylinder mounted in the inner ring of the inner ring, and an adjusting member mounted on the outer ring for driving the inner ring to rotate, and the inner ring is arranged opposite to the test piece placing assembly, and a pressing plate is fixed to the output end of the hydraulic cylinder.

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

[0014] As a further improvement of the above scheme, the inner ring of the outer ring is provided with a sliding groove coaxially arranged therein, the outer ring of the inner ring is sleeved with a connecting ring coaxially arranged therein, and the outer ring of the connecting ring is clamped in the sliding groove and is in sliding connection with the sliding groove.

[0015] Through the above technical scheme, the connecting ring can stably rotate in the outer ring.

[0016] As a further improvement of the above scheme, the side surface of the inner ring is uniformly 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 outer part of the output shaft of the transmission motor, and the transmission gear is in meshing connection with the tooth grooves on the side surface of the inner ring.

[0017] Through the above technical scheme, the rotation of the motor can drive the rotation of the inner ring.

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

[0019] Through the above technical scheme, the fixed frame can be driven to move to drive the lifting of the supporting plate.

[0020] As a further improvement of the above scheme, the top surface of the mounting plate is provided with a mounting groove for mounting an elastic member, the elastic member comprises a sleeve rod fixed inside the mounting groove along the length direction of the mounting groove and a spring movably sleeved outside the sleeve rod, the bottom of the fixed rod extends into the mounting groove and movably sleeved outside the sleeve rod, one end of the spring is fixedly connected with the fixed rod, and the other end of the spring is fixedly connected with the inner wall of the mounting groove, one end of the long side of the fixed frame is a right triangle structure, and the inclined surface faces outward, and the abutting rod abuts against the outer side wall of the long side of the fixed frame.

[0021] Through the above technical scheme, the test piece fixing member can be close to or away from the test piece placing member under the action of the fixed frame.

[0022] As a further improvement of the above scheme, the fixed material mechanism comprises a fixed block, a fixed shaft rotatably connected to the top surface of the fixed block, a take-up reel fixed on the top surface of the fixed shaft, a locking member arranged on the top surface of the take-up reel, and a transmission member arranged on the top surface of the fixed block for driving the fixed shaft to rotate, the outer periphery of the take-up reel is provided with a fixed hole arranged along the radial direction thereof, and the fixed hole is aligned with the through hole, the fixed block in one of the fixed material mechanisms is fixed on the top surface of the mounting plate, and the fixed block in the other fixed material mechanism is fixedly connected with the output end of the first telescopic member, the locking member comprises a fixed bolt rotatably connected to the top surface of the take-up reel and a disc fixed on the top of the fixed bolt, the bottom of the fixed bolt extends into the fixed hole, and the outer periphery of the disc is fixed with a knob.

[0023] Through the above technical scheme, one end of the anchor cable can be fixed in the fixed hole, thereby completing the fixation of the anchor cable, and when the anchor cable is pulled out from the first test piece or the second test piece, the anchor cable can be wound by rotating the take-up reel, thereby achieving the purpose of conveniently pulling out the anchor cable.

[0024] As a further improvement of the above scheme, the transmission member comprises a fixed plate fixed on the top surface of the fixed block, a rotating shaft rotatably connected to the fixed plate, and an adjusting disc fixed on one end of the rotating shaft, the other end of the rotating shaft is in transmission connection with the fixed shaft, and the side of the adjusting disc away from the rotating shaft is rotatably connected with a knob at a position deviated from the center of the circular surface.

[0025] Through the technical scheme, the fixed shaft can be conveniently and labor-saving driven to rotate.

[0026] As a further improvement of the above scheme, the top surface of the mounting plate is provided with a guide groove for mounting a sliding piece, the sliding piece comprises a guide rod fixed inside the guide groove along the length direction of the guide groove and a sliding block movably sleeved outside the guide rod, and the top of the sliding block is fixedly connected with the bottom surface of a fixed block fixedly connected with the output end of the first telescopic piece.

[0027] Through the technical scheme, the fixed block connected with the sliding block can be stably moved on the top surface of the mounting plate under the driving of the first telescopic piece.

[0028] As a further improvement of the above scheme, the limiting piece comprises a limiting column fixed on the top surface of the mounting plate and a limiting block movably sleeved outside 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 with the outer periphery of the screw sleeve.

[0029] Through the technical scheme, the screw sleeve can only move along the axial direction of the screw rod, and the screw sleeve cannot follow the screw sleeve to rotate.

[0030] Compared with the prior art, the beneficial effects of the present application are that:

[0031] 1. Through the cooperation between the test piece placing assembly, the two test piece fixing assemblies and the driving mechanism, the two second test pieces can be automatically folded at the two ends of the first test piece at the same time, and the supporting plate can be driven to descend, thereby avoiding that the supporting plate blocks the movement of the first test piece when the first test piece is subjected to a shearing force, and after the test is completed, the two second test pieces can be separated from the first test piece at the same time, and the supporting plate can be driven to move upwards, thereby the first test piece can be supported, the first test piece can be prevented from falling on the mounting plate after the anchor cable is pulled out of the first test piece, and the supporting plate can also support the first test piece before the anchor cable is pulled tight, so that the first test piece and the second test piece are folded more accurately.

[0032] 2. Through the arrangement of the fixing mechanism, the two ends of the anchor cable can be conveniently fixed, and the anchor cable can be conveniently and labor-saving pulled out of the first test piece and the second test piece after the test is completed.

[0033] 3. Through the arrangement of the force applying mechanism, the direction of the force can be conveniently adjusted, so that the anchor cable can be cyclically subjected to pressure from different directions according to the needs of the test, and more accurate performance data can be obtained. BRIEF DESCRIPTION OF DRAWINGS

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

[0035] Figure 2 is a perspective view of the right side of the present application;

[0036] Figure 3 Fig. 2 is a structural schematic view of the force applying mechanism; Figure 2 Fig. 3 is an enlarged view of the middle A of Fig. 2;

[0037] Figure 4 Fig. 4 is a structural schematic view of the force applying mechanism;

[0038] Figure 5 Fig. 5 is a structural schematic view of the front of the test bench;

[0039] Figure 6 Fig. 6 is a structural schematic view of the back of the test bench;

[0040] Figure 7 Fig. 7 is a structural schematic view of the test bench after the anchor cable is fixed;

[0041] Figure 8 Fig. 8 is a structural schematic view of the test bench when the two first test pieces and the second test piece are closed.

[0042] Main symbol explanation:

[0043] 1, base; 2, outer ring; 3, mounting plate; 4, inner ring; 5, fixing cylinder; 6, fixing frame; 7, force applying mechanism; 701, adjusting disc; 702, rotating shaft; 703, fixing shaft; 704, take-up disc; 705, locking piece; 706, handle; 707, fixing hole; 708, fixing plate; 8, through hole; 9, fixing block; 10, transmission motor; 11, first telescopic piece; 12, hydraulic cylinder; 13, pressing plate; 14, supporting plate; 15, limiting block; 16, rack; 17, limiting column; 18, screw rod; 19, fixing gear; 20, abutting rod; 21, fixing rod; 22, second telescopic piece; 23, screw sleeve; 24, connecting ring; 25, sliding groove; 26, transmission gear; 27, locking bolt; 28, sleeve rod; 29, guide groove; 30, guide rod; 31, mounting groove; 32, first test piece; 33, second test piece; 34, anchor cable. DETAILED DESCRIPTION

[0044] Hereinafter, the present application will be further described in conjunction with the drawings and the specific embodiments. It should be noted that, under the premise of no conflict, the following described embodiments or technical features can be combined in any manner to form new embodiments.

[0045] Embodiment 1:

[0046] Please combine Figure 1 - Figure 8The NPR anchor cable dynamic cycle shearing failure simulation experiment device of the embodiment comprises a test table and a force applying mechanism, the test table comprises a base 1, a mounting plate 3 fixed on the top surface of the base 1, two fixed material mechanisms 7 and a test piece fixing mechanism mounted on the top surface of the mounting plate 3, the two fixed material mechanisms 7 are respectively located on the two sides of the test piece fixing mechanism, and one of the two fixed material mechanisms 7 is fixed on the top surface of the mounting plate 3, and the other fixed material mechanism 7 is movably mounted on the top surface of the mounting plate 3 through a sliding piece, a first telescopic piece 11 for driving the fixed material mechanism to move is mounted on the top surface of the mounting plate 3, the first telescopic piece 11 is an oil cylinder, and then the first telescopic piece 11 is started to be elongated after the two ends of the anchor cable to be tested are respectively fixed in the two fixed material mechanisms 7, so that the anchor cable can be straightened and tightened.

[0047] The test piece fixing mechanism comprises a test piece placing assembly and two test piece fixing assemblies respectively located on the two sides of the test piece placing assembly, the test piece placing assembly comprises a screw rod 18 rotationally connected to the top surface of the mounting plate 3, a screw sleeve 23 threadedly sleeved on the outer part of the top end of the screw rod 18, a supporting plate 14 fixed on the top surface of the screw sleeve 23 and a limiting piece mounted between the screw sleeve 23 and the mounting plate 3, the limiting piece comprises a limiting column 17 fixed on the top surface of the mounting plate 3 and a limiting block 15 movably sleeved on the outer periphery of the limiting column 17, the limiting column 17 is arranged along the axial direction of the screw rod 18, one end of the limiting block 15 is fixedly connected with the outer periphery of the screw sleeve 23, and the limiting piece is arranged so that the screw sleeve 23 cannot rotate when the screw rod 18 rotates, but can only move along the axial direction of the screw rod 18, so that the screw rod 18 is driven to rotate to drive the supporting plate 14 to ascend and descend, the first test piece 32 can be placed on the supporting plate 14 before testing, so that the gravity of the first test piece 32 does not cause the anchor cable to sag, the height of the supporting plate 14 can be lowered after the anchor cable is tightened, so that the movement of the first test piece 32 is not affected, and the supporting plate 14 can be raised again after the test is completed, so that the first test piece 32 can be supported during the process of withdrawing the anchor cable, and the first test piece 32 is prevented from falling.

[0048] The test piece fixing assembly comprises a fixing rod 21 mounted on the top surface of the mounting plate 3 through an elastic piece, a fixing cylinder 5 fixed on the top of the fixing rod 21, a plurality of locking bolts 27 mounted on the outer periphery of the fixing cylinder 5 and an abutting rod 20 fixed on the side of the fixing rod 21 close to the test piece placing assembly, a through hole 8 is formed in the side of the fixing cylinder 5 away from the test piece placing assembly, the through hole 8 is arranged for the anchor cable to pass through, and the inner side of the fixing cylinder 5 is arranged for fixing the second test piece 33, the second test piece 33 is placed into the fixing cylinder 5, and then the locking bolts 27 are tightened to press the second test piece 33 in the inner part of the fixing cylinder 5.

[0049] The top surface of the mounting plate 3 is further provided with a driving mechanism for driving the screw rod 18 to rotate, and the driving mechanism cooperates with the abutting rod 20 to drive the abutting rod 20 to move when the screw rod 18 rotates. The driving mechanism comprises a fixed frame 6 provided 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 mounted 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 with the short side of the fixed frame 6. The outer periphery of the screw rod 18 is sleeved with a fixed gear 19 engaged 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 rod 18 also rotates forward. At this time, the screw sleeve 23 descends, thereby driving the supporting plate 14 to descend. Conversely, when the second telescopic member 22 is retracted, the screw sleeve 23 can be driven to ascend, thereby driving the supporting plate 14 to also ascend.

[0050] The top surface of the mounting plate 3 is provided with a mounting groove 31 for mounting an elastic member. The elastic member comprises a sleeve rod 28 fixed in 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 fixed 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 with the fixed rod 21, and the other end of the spring is fixedly connected with the inner wall of the mounting groove 31. One end of each of the long sides of the fixed frame 6 is in a right triangle structure, and the inclined surface faces outward. The abutting rod 20 abuts against the outer side wall of the long side of the fixed frame 6. When the two second test pieces 33 are folded at the two ends of the first test piece 32, the spring is in a stretched state, and the supporting plate 14 is located below the fixed cylinder 5. In the case of not being tested, the two test piece fixing assemblies are in a close state with the test piece placing assembly under the action of the spring. At this time, the top surface of the supporting plate 14 is flush with the bottom surface of the inner ring of the fixed cylinder 5. The arrangement of the elastic member enables the fixed rod 21 to move along the length direction of the mounting groove, and enables one end of the abutting rod 20 to always abut against the outer wall of the long side of the fixed frame 6. When the abutting rod 20 contacts the non-inclined surface region of the long side of the fixed frame 6, the position of the fixed rod 21 does not change when the fixed frame 6 moves. When the abutting rod 20 contacts the inclined surface region of the fixed frame 6, the fixed rod 21 and the fixed cylinder 5 will move away from the test piece placing assembly when the fixed frame 6 moves forward. When the fixed frame 6 moves backward, the fixed cylinder 5 will move close to the test piece placing assembly, thereby achieving the purpose of automatically driving the test piece fixing assembly to move close to or away from the test piece placing assembly, and further facilitating the folding and separation of the first test piece 32 and the second test piece 33.

[0051] The force applying mechanism comprises an outer ring 2 fixed on the top of the base 1 and a force applying member movably mounted in the inner circle of the outer ring 2 and rotatable along the inner circle of the outer ring 2, the test bench is arranged through the inner circle of the outer ring 2, the force applying member comprises an inner ring 4 rotatably sleeved with the inner circle of the outer ring 2, a hydraulic cylinder 12 mounted in the inner circle of the inner ring 4 and an adjusting member mounted on the outer ring 2 and used for driving the inner ring 4 to rotate, and the inner ring 4 is arranged opposite to the test piece placing assembly, the output end of the hydraulic cylinder 12 is fixed with a pressing plate 13, the inner circle of the outer ring 2 is provided with a sliding groove 25 coaxially arranged therewith, the outer circle of the inner ring 4 is sleeved with a connecting ring 24 coaxially arranged therewith, the outer circle of the connecting ring 24 is clamped in the sliding groove 25 and is in sliding connection with the sliding groove 25, the side surface of the inner ring 4 is uniformly provided with a plurality of tooth grooves, the adjusting member comprises a transmission motor 10 mounted on the side wall of the outer ring 2 and a transmission gear 26 sleeved with the outer part of the output shaft of the transmission motor 10, the transmission gear 26 is in meshing connection with the tooth grooves in the side surface of the inner ring 4, when the hydraulic cylinder 12 is elongated, the pressing plate 13 is driven to move towards the first test piece 32, when the pressing plate 13 is in contact with the first test piece, a shearing force can be formed between the first test piece 32 and the second test piece 33, the shearing force acts on the anchor cable, then the pressure applied on the first test piece 32 and the displacement of the first test piece 32 are observed, then the deformation amount data of the NPR anchor cable subjected to the shearing force is calculated according to the pressure and the displacement change, and when the transmission motor 10 rotates, the inner ring 4 can be driven to rotate, so that the position of the hydraulic cylinder 12 can be adjusted, and then the first test piece 32 can be stressed from different directions, so that the anchor cable can be stressed from different directions.

[0052] The implementation principle of the embodiment is that, during the test, the first test piece 32 and the two second test pieces 33 are arranged on the outer periphery of the anchor cable 34, and the two second test pieces 34 are located on the two sides of the first test piece 32, then the two second test pieces 33 are respectively arranged in the fixing barrels of the two test piece fixing assemblies, the locking bolts 27 are tightened to clamp the second test pieces 33, the first test piece 32 is placed on the supporting plate 14, then the two ends of the anchor cable are respectively fixed on the two material fixing mechanisms, and the anchor cable is tightened.

[0053] Next, the two second test pieces 33 are folded at the two ends of the first test piece 32. When operating, the second telescopic part 22 is first retracted, thereby driving the fixed frame 6 to move backward. At this time, the rack 16 drives the screw rod 18 to rotate forward, the screw sleeve 23 and the supporting plate 14 are lowered, the supporting plate is away from the first test piece 32, and when the abutting rod 20 contacts the inclined surface area of the fixed frame 6, it gradually approaches the test piece during the continuous backward movement of the fixed frame 6 until the second test piece 33 abuts at one end of the first test piece 32, thereby completing the folding 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 folded, the force applying mechanism can be started to press the first test piece 32. At this time, the hydraulic cylinder 12 is elongated, thereby driving the pressing plate 13 to approach the first test piece 32. When the pressing plate 13 contacts the first test piece, a shearing force can be formed between the first test piece 32 and the second test piece 33, which acts on the anchor cable. Then, the pressure applied on the first test piece 32 and the displacement of the first test piece 32 are observed, and then the deformation data of the NPR anchor cable caused by the shearing force is calculated according to the pressure and displacement change. When the force 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 part 22 is elongated, thereby driving the fixed frame 6 and the rack 16 to move forward. The screw rod 18 is reversed, the screw sleeve 23 and the supporting plate 14 are moved upward, and the first test piece 32 can be supported after the supporting plate 14 contacts the first test piece 32. During the forward movement of the fixed frame 6, the abutting rod 20 moves away from the test piece placing assembly under the extrusion of the inclined surface of the fixed frame 6, thereby separating the second test piece 33 from the first test piece 32. Until the abutting rod 20 moves to the non-inclined surface area of the fixed frame 6, the abutting rod 20 and the fixed cylinder will not move any more. Then, the first test piece 32 and the second test piece 33 can be removed from the anchor cable.

[0055] Example 2:

[0056] In combination Figure 1 - Figure 2 and Figure 5 - Figure 8The embodiment is further improved on the basis of embodiment 1, and the improvement lies in that the solid material mechanism 7 comprises a fixed block 9, a fixed shaft 703 rotatably connected to the top surface of the fixed block 9, a take-up reel 704 fixed to the top surface of the fixed shaft 703, a locking piece 705 installed on the top surface of the take-up reel 704, and a transmission piece installed on the top surface of the fixed block 9 and used for driving the fixed shaft 703 to rotate, the outer ring of the take-up reel 704 is provided with a fixed hole 707 arranged along the radial direction of the take-up reel 704, and the fixed hole 707 is aligned with the through hole 8, the fixed block 9 in one of the solid material mechanisms 7 is fixed to the top surface of the mounting plate 3, and the fixed block 9 in the other solid material mechanism 7 is fixed to the output end of the first telescopic piece 11, the locking piece 705 comprises a fixed bolt rotatably connected to the top surface of the take-up reel 704 and a disc fixed to the top of the fixed bolt, the bottom of the fixed bolt extends into the fixed hole 707, and the outer periphery of the disc is fixed with a poking column, the top surface of the mounting plate 3 is provided with a guide groove 29 used for installing a sliding piece, the sliding piece comprises a guide rod 30 fixed to the inside along the length direction of the guide groove 29 and a sliding block movably sleeved on the outer periphery of the guide rod 30, the top of the sliding block is fixed to the bottom surface of the fixed block 9 fixed to the output end of the first telescopic piece 11, and when the anchor cable is fixed, one end of the anchor cable is inserted into the fixed hole 707, and then the fixed bolt is tightened, the anchor cable is pressed by the fixed bolt, and thus the anchor cable is locked in the fixed hole 707, so that the fixing of the anchor cable is completed, and the setting of the sliding piece enables the fixed block 9 connected with the sliding block to stably slide on the top surface of the mounting plate 3.

[0057] The transmission piece comprises 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 disc 701 fixed to one end of the rotating shaft 702, the other end of the rotating shaft 702 is fixed with a driving bevel gear, the outer periphery of the fixed shaft 703 is sleeved with a driven bevel gear meshing with the driving bevel gear, and the side of the adjusting disc 701 away from the rotating shaft 702 is rotatably connected with a handle 706 at a position deviating from the center of the circular surface, the setting of the handle 706 enables the rotating of the adjusting disc 701 to be more convenient and labor-saving, and after the test is completed, the rotating of the fixed shaft 703 can be driven by rotating the rotating shaft 702, and the anchor cable can be gradually wound on the take-up reel 704 after the rotating of the fixed shaft 703, 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 the embodiment is that when the anchor cable is broken and the test is completed, the first test piece 32 and the second test piece 33 need to be taken off from the anchor cable, since the anchor cable may be deformed, the first test piece 32 and the second test piece 33 are difficult to take off, at this time, the handle 706 is only needed to be held and rotated, so as to drive the rotating shaft 702 to rotate, the take-up reel 704 is driven to rotate after the rotating of the rotating shaft 702, and thus the anchor cable can be wound on the take-up reel 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.

[0059] The above embodiments are only the preferred embodiments of the present application, and cannot be used to limit the scope of protection of the present application. Any non-essential changes and substitutions made by those skilled in the art based on the present application shall fall within the scope of protection of the present application.

Claims

1. An experimental apparatus for simulating dynamic cyclic shear failure of NPR anchor cables, comprising a test stand and a force application mechanism, characterized in that, The test bench includes a base, a mounting plate fixed to the top surface of the base, two material fixing mechanisms and a specimen fixing mechanism mounted on the top surface of the mounting plate. The two material fixing mechanisms are located on both sides of the specimen fixing mechanism, and one of the material fixing mechanisms is fixed to the top surface of the mounting plate, while the other material fixing mechanism is movably mounted on the top surface of the mounting plate through a sliding joint. 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 includes a specimen placement assembly and two specimen fixing assemblies located on both sides of the specimen placement assembly. The specimen placement assembly includes a screw rotatably connected to the top surface of the mounting plate, a screw sleeve threaded onto the outside of the top of the screw, a support plate fixed to the top surface of the screw sleeve, and a limiting member installed between the screw sleeve and the mounting plate. The specimen fixing assembly includes a fixing rod mounted on the top surface of the mounting plate by an elastic element, a fixing cylinder fixed to the top of the fixing rod, multiple locking bolts mounted on the outer periphery of the fixing cylinder, and an abutment rod fixed to the side of the fixing rod near the specimen placement assembly. The fixing cylinder has a through hole on the side away from the specimen placement assembly. The top surface of the mounting plate is also equipped with a drive mechanism for driving the screw to rotate, and the drive mechanism cooperates with the abutment rod to drive the abutment rod to move when the screw rotates. The force-applying mechanism includes an outer ring fixed to the top of the base and a force-applying component movably installed on the inner ring of the outer ring and rotatable along the inner ring of the outer ring. The test bench is set through the inner ring of the outer ring.

2. The NPR anchor cable dynamic cyclic shear failure simulation experimental device according to claim 1, characterized in that, The force-applying component includes an inner ring that rotatably connects to the inner ring of the outer ring, a hydraulic cylinder installed on the inner ring, and an adjusting component installed on the outer ring for driving the inner ring to rotate. The inner ring is positioned directly opposite 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, characterized in that, The inner ring of the outer ring has a sliding groove coaxially arranged therewith, and the outer ring of the inner ring is fitted with a connecting ring coaxially arranged therewith. 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, characterized in that, The inner ring has multiple toothed grooves evenly spaced on its side. The adjusting component includes a drive motor mounted on the outer ring sidewall and a drive gear sleeved outside the output shaft of the drive motor. The drive gear meshes with the toothed grooves on the side of the inner ring.

5. The NPR anchor cable dynamic cyclic shear failure simulation experimental device according to claim 1, characterized in that, The driving mechanism includes a fixed frame 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. A fixed gear that meshes with the rack is sleeved on the outer periphery of the screw.

6. The NPR anchor cable dynamic cyclic shear failure simulation experimental device according to claim 1, characterized in that, The top surface of the mounting plate is provided with a mounting groove for mounting an elastic element. The elastic element includes a sleeve rod fixed inside the mounting groove along its length 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 each of the two long sides of the fixed frame is a right-angled triangle structure with the inclined surface facing outward. The abutment rod abuts against the outer 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, characterized in that, The material securing mechanism includes a fixed block, a fixed shaft rotatably connected to the top surface of the fixed block, a take-up reel fixed to the top surface of the fixed shaft, a locking component installed on the top surface of the take-up reel, and a transmission component installed on the top surface of the fixed block for driving the fixed shaft to rotate. The outer ring of the take-up reel has a fixing hole arranged in its radial direction, and the fixing hole is aligned with the through hole. The fixed block in one of the material securing mechanisms is fixed to the top surface of the mounting plate, and the fixed block in the other material securing mechanism is fixed to the output end of the first telescopic component. The locking component includes a fixing bolt rotatably connected to the top surface of the take-up reel and a disc fixed to the top of the fixing bolt. The bottom of the fixing bolt extends into the fixing hole, and an actuating post 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, characterized in that, The transmission component includes a fixed plate fixed to the top surface of the fixed block, a rotating shaft rotatably connected to the fixed plate, and an adjusting disc fixed to one end of the rotating shaft. The other end of the rotating shaft is connected to the fixed shaft. A handle is rotatably connected to the side of the adjusting disc away from the rotating shaft at a position off-center.

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 the sliding member. The sliding member includes a guide rod fixed inside the guide groove along its length and a slider movably sleeved on the outer periphery of the guide rod. The top of the slider is fixedly connected to the bottom surface of the fixing block fixedly connected 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 component includes a limiting post fixed to the top surface of the mounting plate and a limiting block movably sleeved on the outer periphery of the limiting post. The limiting post 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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