Hybrid power disaster simulation experiment device under cyclic dynamic load condition

Abstract

The invention provides a hybrid power disaster simulation experiment device under a cyclic dynamic load condition, which comprises a main body supporting mechanism, and is characterized in that the main body supporting mechanism comprises a top beam, a base and a stand column vertically supported between the top beam and the base, a driving mechanism is arranged at the lower end of the top beam, and the driving mechanism is connected with a lifting mechanism; the lifting mechanism is connected with the heavy hammer mechanism, an auxiliary testing mechanism and a monitoring mechanism are arranged on the base, and the monitoring mechanism is arranged above the auxiliary testing mechanism and connected with the auxiliary testing mechanism; a sample mechanism is arranged in the monitoring mechanism. According to the invention, a hybrid dynamic disaster simulation experiment under a cyclic dynamic load condition is realized, and data of absorption energy of samples including coal rock and other samples can be obtained under the condition of hybrid dynamic disasters through a drop hammer and a residual impact energy testing device; and the output of different impact energy is realized by changing the mass or height of the heavy hammer mechanism. The experimental device is simple in energy conversion and ensures the accuracy of an output energy value.

Description

Technical Field

[0001] The present invention relates to the field of composite dynamic disaster simulation experiments under cyclic dynamic load conditions, and specifically to a composite dynamic disaster simulation experiment device under cyclic dynamic load conditions; through a drop hammer and a residual impact energy testing device, the energy absorption data of the composite dynamic disaster including but not limited to coal and rock samples are tested under composite dynamic disaster conditions. Background Art

[0002] For the study of compound dynamic disasters under cyclic dynamic load conditions, the energy absorption characteristics of coal and rock are a very important factor. At present, the Split Hopkinson Pressure Bar (SHPB) device is generally used in the study of the mechanical characteristics of coal and rock under impact loads at home and abroad. The strain rate range of this device is 10s -1 ~10 4 s -1 This is the range in which the strain rate sensitivity of engineering material stress changes dramatically. However, the Hopkinson bar impact tester mainly performs high-speed impact tests on small specimens and cannot test larger specimens. In addition, the impact velocity of the bullet is high, but the energy level is low. At the same time, it is required that the object being tested cannot produce excessive fragmentation, and the conditions are relatively harsh. Summary of the invention

[0003] In view of the above problems, the present invention proposes a composite dynamic disaster simulation experimental device under cyclic dynamic load conditions, which achieves the output of different impact energies by changing the mass and / or height of the falling hammer, and its energy conversion is simple to ensure the accuracy of the output energy value.

[0004] In view of this, a composite dynamic disaster simulation experimental device under cyclic dynamic load conditions of the present invention includes a main support mechanism, the main support mechanism includes a top beam, a base and a column vertically supported between the top beam and the base, a driving mechanism is provided at the lower end of the top beam, the driving mechanism is connected to the lifting mechanism, the lifting mechanism is connected to the heavy hammer mechanism, an auxiliary testing mechanism and a monitoring mechanism are provided on the base, the monitoring mechanism is arranged above the auxiliary testing mechanism and connected to the auxiliary testing mechanism; a sample mechanism is provided in the monitoring mechanism.

[0005] Preferably, the main body support mechanism further comprises a screw positioning block and a rotating screw, and both ends of the rotating screw are respectively connected to the top beam and the base through the screw positioning block; the driving mechanism is rotationally connected to the lifting mechanism through the rotating screw.

[0006] Furthermore, the lifting mechanism includes a lifting device beam, both ends of which are rotatably connected to a rotating screw, a laser distance sensor is provided at the lower end of the lifting device beam, a laser receiver matching it is provided at the upper end of the monitoring mechanism, and the laser distance sensor is electrically connected to a computer.

[0007] Preferably, the weight mechanism comprises an electromagnet and a first weight, the electromagnet is arranged at the lower end of the lifting mechanism, and the lifting mechanism absorbs the first weight through the electromagnet.

[0008] Furthermore, a first weight positioning hole is provided at the center of the lower end of the electromagnet, and a protrusion matching the first weight positioning hole is provided at the upper end of the first weight; an accumulator is provided between the electromagnet and the first weight;

[0009] The lower end of the first weight is connected to an impact weight, a weight connecting hole is provided at the lower end of the first weight, a threaded protrusion is provided at the upper end of the impact weight, and the impact weight is screwed to the first weight through the threaded protrusion and the first weight positioning hole.

[0010] Furthermore, a plurality of increasing and decreasing weights are arranged between the first weight and the impact weight, a threaded protrusion is arranged at the upper end of each increasing and decreasing weight, and a weight connecting hole is arranged at the lower end of each increasing and decreasing weight.

[0011] Preferably, the system comprises a hydraulic spring, a second hydraulic cylinder and a second air cylinder; the second hydraulic cylinder is connected to the monitoring mechanism via a hydraulic spring, and the second air cylinder is connected to the second hydraulic cylinder via an oil pipe.

[0012] Furthermore, the monitoring mechanism includes a T-shaped column 51, an upper baffle and a lower baffle, the lower end of the T-shaped column 51 is fixed on the base, the upper baffle and the lower baffle are nested on the T-shaped column 51 through four baffle guide blocks, and a hydraulic cylinder 1 is placed between the top of the T-shaped column 51 and the upper baffle; the lower end of the lower baffle is respectively connected to a hydraulic cylinder 2 and a hydraulic spring; a laser distance sensor 2 is arranged on the upper end of the lower baffle, and a laser receiver 2 matching it is arranged on the auxiliary testing mechanism.

[0013] Furthermore, the sample mechanism includes a sample sealing box, in which the sample is arranged, and the sample is connected to the upper baffle through a loading pressure head; an inflation tube is arranged at the upper end of the sample loading box, and an observation port is opened on the side of the sample loading box.

[0014] Preferably, the lifting mechanism comprises a small automatic winch and a steel wire rope, wherein the small winch is fixed at the lower end of the top plate; one end of the steel wire rope is connected to the small winch, and the other end is connected to the upper end of the monitoring mechanism.

[0015] The beneficial effects of the present invention are:

[0016] 1. In the present invention, the composite dynamic disaster simulation experiment under cyclic dynamic load conditions is realized through the arrangement of the main support mechanism, the driving mechanism, the lifting mechanism, the heavy hammer mechanism, the auxiliary testing mechanism, the monitoring mechanism and the sample mechanism. The data of the absorbed energy of the samples including but not limited to coal and rock under the composite dynamic disaster can be tested through the drop hammer and the residual impact energy testing device; and the output of different impact energies can be realized by changing the mass and / or height of the heavy hammer mechanism. The energy conversion of this experimental device is simple, and the accuracy of the output energy value is guaranteed.

[0017] 2. In the present invention, by cooperating with the first meshing gear, the second meshing gear and the transmission shaft in the driving mechanism, the two rotating screws are operated synchronously and in the same direction, so that the lifting mechanism can remain horizontal when moving, and the lifting mechanism can be lifted stably, thereby adjusting the impact height of the experimental weight according to the experimental requirements.

[0018] 3. In the present invention, by arranging a laser distance sensor at the lower part of the lifting mechanism, it is possible to control the lifting device and calculate the energy value of the impact output.

[0019] 4. In the present invention, the weight of the weight can be adjusted according to the experimental needs through the setting of the weight mechanism; an initial acceleration is applied to the first weight through the accumulator to meet the requirements of different impact speeds.

[0020] 5. In the present invention, through the setting of the auxiliary testing mechanism, when the impact loading occurs, the sample is compressed, and the sum of the work done by the extrusion hydraulic spring and the compressed gas is calculated as the residual impact energy after the sample absorbs the energy, thereby ensuring the integrity and reliability of the experimental data.

[0021] 6. In the present invention, the automatic winch and the steel wire rope are arranged so that the impact caused by the secondary drop of the weight mechanism cannot act on the sample, thereby effectively avoiding the secondary impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The structure of the experimental device of the present invention is schematically shown in the case where no impact test is performed. Figure 1 ;

[0023] Figure 2 The structure of the experimental device of the present invention after impact loading Figure 1 ;

[0024] Figure 3 for Figure 2 A schematic diagram of the structure with a partial enlargement at the center;

[0025] Figure 4 for Figure 2 A schematic diagram of the structure with a partial enlargement at B in the middle;

[0026] Figure 5 for Figure 4 Schematic diagram of the structure where the upper baffle is lifted after impact loading at C in the middle.

[0027] In the figure: 1, main body support mechanism; 11, top beam; 12, column; 13, base; 14, screw positioning block; 15, rotating screw; 16, heavy hammer guide rail;

[0028] 2. driving mechanism; 21. driving motor; 22. motor output shaft; 23. first meshing gear; 24. transmission shaft; 25. second meshing gear;

[0029] 3. Lifting mechanism; 31. Lifting device crossbeam; 32. Nut sleeve; 33. Laser distance sensor 1; 34. Laser receiver 1; 35. Small automatic winch; 36. Steel wire rope; 37. Laser distance sensor 2; 38. Laser receiver 2;

[0030] 4. Heavy hammer mechanism; 41. Electromagnet; 42. First heavy hammer positioning hole; 43. First heavy hammer; 44. Heavy hammer connection hole; 45. Increase and decrease heavy hammer; 46. Impact end heavy hammer; 47. Accumulator;

[0031] 5. Monitoring mechanism; 51. T-shaped column; 52. Upper baffle; 53. Lower baffle; 54. Baffle guide block; 55. Guide wheel; 56. Hydraulic cylinder 1; 57. Laser distance sensor 3; 58. Laser receiver 3;

[0032] 6. Sample mechanism; 61. Sample sealing box; 62. Loading pressure head; 63. Inflating tube; 64. Observation port; 65. Sample;

[0033] 7. Adjustment mechanism; 71. Center positioning hole of base; 72. Lower end height adjustment plate; 73. Height adjustment plate connection hole; 74. Upper end height adjustment plate; 75. Hydraulic cylinder positioning hole;

[0034] 8. Auxiliary testing mechanism; 81. Hydraulic cylinder 2; 82. Hydraulic cylinder impact head; 83. Hydraulic spring; 84. Oil pipe; 85. Check valve; 86. Cylinder 2; 87. Piston in cylinder; 88. Pressure gauge. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned objectives, technical solutions and advantages of the present invention more clear, the specific implementation methods of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0036] See also Figure 1-5As shown, a composite dynamic disaster simulation experimental device under cyclic dynamic load conditions of the present invention includes a main support mechanism 1, the main support mechanism 1 includes a top beam 11, a base 13 and a column 12 vertically supported between the top beam 11 and the base 13, a driving mechanism 2 is provided at the lower end of the top beam 11, the driving mechanism 2 is connected to a lifting mechanism 3, the lifting mechanism 3 is connected to a heavy hammer mechanism 4, an auxiliary test mechanism 8 and a monitoring mechanism 5 are provided on the base 13, the monitoring mechanism 5 is arranged above the auxiliary test mechanism 8 and connected to the auxiliary test mechanism 8; a sample mechanism 6 is provided in the monitoring mechanism 5.

[0037] In this embodiment, see Figure 1 As shown, the main mechanism includes a top beam 11, a column 12 and a base 13. There are two columns 12, which are symmetrically arranged on both sides between the top beam 11 and the base 13 to form a frame structure for supporting the device. The driving mechanism 2 drives the lifting mechanism 3 to rise or fall, and the lifting mechanism 3 drives the heavy hammer mechanism 4 to impact the sample 65. The monitoring mechanism 5 is used to place the sample mechanism 6 and perform the test. The auxiliary testing mechanism 8 is used to measure the residual impact energy.

[0038] Preferably, the main support mechanism 1 further includes a screw positioning block 14 and a rotating screw 15 , and both ends of the rotating screw 15 are respectively connected to the top beam 11 and the base 13 through the screw positioning block 14 ; the driving mechanism 2 is rotationally connected to the lifting mechanism 3 through the rotating screw 15 .

[0039] In this embodiment, see Figure 1-3 As shown, two cylindrical rotating screws 15 are connected between the top beam 11 and the base 13 through the screw positioning block 14. The screw positioning block 14 has a hollow cylindrical structure. The upper and lower ends of the rotating screw 15 are embedded in the screw positioning block 14. Lubricating oil is applied inside the screw positioning block 14 to ensure smooth operation of the rotating screw 15. The driving mechanism 2 includes a driving motor 21, a first meshing gear 23, a transmission shaft 24 and a second meshing gear 25. The driving motor 21 controls the two first meshing gears 23 through the motor output shaft 22. The gear directions of the left and right first meshing gears 23 are opposite. The left and right first meshing gears 23 are respectively connected to a transmission shaft 24, so that the left and right transmission shafts 24 can rotate in the same direction. Each transmission shaft 24 is connected to a second meshing gear 25. The second meshing gear 25 is arranged on the rotating screw 15, and finally the two rotating screws 15 rotate in the same direction, thereby driving the lifting mechanism 3 to rise or fall. Through the cooperation of the first meshing gear 23 and the second meshing gear 25 , the two rotating screws 15 are operated simultaneously and in the same direction, so that the lifting mechanism 3 can remain horizontal when moving, and the lifting mechanism 3 can be lifted stably.

[0040] Furthermore, the lifting mechanism 3 includes a lifting device beam 31, both ends of which are rotatably connected to the rotating screw 15, a laser distance sensor 33 is provided at the lower end of the lifting device beam 31, and a laser receiver 34 matching it is provided at the upper end of the monitoring mechanism 5, and the laser distance sensor 34 is electrically connected to the computer.

[0041] In this embodiment, see Figure 2 and Figure 3 As shown, the two ends of the lifting device cross beam 31 are rotatably connected with the two rotating screws 15 through the nut sleeve 32. When the two rotating screws 15 rotate in the same direction, the nut sleeve 32 is driven to move up and down, thereby driving the lifting device cross beam 31 to move up and down. A laser distance sensor 33 is provided at the lower end of the lifting device cross beam 31, and a laser receiver 34 matched therewith is provided on the monitoring mechanism 5. The height of the lifting mechanism 3 is adjusted by the laser distance sensor 33 and the laser receiver 34, thereby determining the height of the weight mechanism 4. Specifically, the laser distance sensor 33 determines the height of the weight by measuring the distance with the laser receiver 34. The impact height required by the experiment is input into the computer control end. When the lifting device cross beam 31 reaches the required height, the computer sends a stop command to the drive motor 21, and the computer controls the drive motor 21 to stop running. By calculating the gravitational potential energy of the weight mechanism 4, the output energy value is obtained.

[0042] Preferably, the weight mechanism 4 includes an electromagnet 41 and a first weight 43 . The electromagnet 41 is disposed at the lower end of the lifting mechanism 3 . The lifting mechanism 3 absorbs the first weight 43 through the electromagnet 41 . The first weight 43 is sleeved on and vertically disposed on a weight guide rail 16 at the lower end of the top beam 11 .

[0043] In this embodiment, see Figure 1-3 As shown, the electromagnet 41 is arranged at the lower end of the lifting mechanism 3. The electromagnet 41 generates magnetic force when energized, and the lifting mechanism 3 absorbs the first weight 43 through the electromagnet 41. Specifically, the electromagnet 41 is installed at the center position of the lifting device beam 31. The electromagnet 41 generates magnetic force when energized, and releases the weight to perform an impact test after power is cut off.

[0044] Furthermore, a first weight positioning hole 42 is provided at the center position of the lower end of the electromagnet 41, and a protrusion matching the first weight positioning hole 42 is provided at the upper end of the first weight 43; an accumulator 47 is provided between the electromagnet 41 and the first weight 43; an impact weight is connected to the lower end of the first weight 43, a weight connecting hole 44 is provided at the lower end of the first weight 43, and a threaded protrusion is provided at the upper end of the impact weight, and the impact weight is screwed to the first weight 43 through the threaded protrusion and the first weight positioning hole 42.

[0045] In this embodiment, see Figure 1-4As shown, a first weight positioning hole 42 is designed at the center position of the bottom of the electromagnet 41, and a protrusion that matches the first weight positioning hole 42 is set on the upper part of the first weight 43 to ensure that after the electromagnet 41 absorbs the first weight 43, the first weight 43 is in the exact center position to prevent eccentric loading during impact. An accumulator 47 is set between the electromagnet 41 and the first weight 43, and the number of accumulators 47 is not limited to one. The first weight 43 is ejected downward by the energy of the accumulator 47, and the electromagnet 41 is powered off at the same time of ejection. An initial acceleration is applied to the first weight 43 by the accumulator 47 to meet the requirements of different impact speeds. A weight connection hole 44 is designed at the bottom of the first weight 43, and the impact test is realized by connecting with the threaded protrusion on the upper part of the impact weight. No weight connection hole 44 is set at the bottom of the impact end weight 46.

[0046] Furthermore, a plurality of increasing and decreasing weights 45 are provided between the first weight 43 and the impact weight, a threaded protrusion is provided at the upper end of each increasing and decreasing weight 45 , and a weight connecting hole 44 is provided at the lower end of each increasing and decreasing weight 45 .

[0047] In this embodiment, see Figure 1-2 As shown, according to the experimental requirements, a certain number of increasing and decreasing weights 45 are set; the upper and lower ends of the increasing and decreasing weights 45 are provided with threaded protrusions and weight connecting holes 44, which are convenient for the combination of the weights, so that several increasing and decreasing weights 45 are screwed together through the threaded protrusions and the weight connecting holes 44, and their upper ends are screwed to the lower end of the first weight 43, and their lower ends are screwed to the upper end of the impact weight, forming a complete weight to meet different impact energy requirements.

[0048] Preferably, the auxiliary testing mechanism 8 includes a hydraulic spring 83 , a hydraulic cylinder 81 and a gas cylinder 86 ; the hydraulic cylinder 81 is connected to the monitoring mechanism 5 via the hydraulic spring 83 , and the gas cylinder 86 is connected to the hydraulic cylinder 81 via an oil pipe 84 .

[0049] Furthermore, the composite dynamic disaster simulation experimental device under cyclic dynamic load conditions of the present invention also includes an adjustment mechanism 7, which includes a height adjustment plate and a hydraulic cylinder positioning hole 75, and the hydraulic cylinder 81 is fixed on the height adjustment plate through the hydraulic cylinder positioning hole 75.

[0050] In this embodiment, as shown in Figure 2, the hydraulic cylinder 81 is arranged on the base 13, the top of the hydraulic cylinder 81 is connected to the monitoring mechanism 5 through the hydraulic cylinder impact head 82, and hydraulic springs 83 are arranged at both ends of the top of the hydraulic cylinder 81. By replacing springs with different stiffness, different elastic requirements can be met. The upper end of the hydraulic spring 83 is connected to the lower end of the monitoring mechanism 5, and the lower end of the hydraulic spring 83 is arranged on the top of the hydraulic cylinder 81. The lower part of the hydraulic cylinder 81 is connected to the cylinder 86 through the oil pipe 84, and the cylinder 86 is provided with a cylinder piston 87, and the cylinder 86 is connected to the pressure gauge 88. A base center positioning hole 71 is designed at the center position of the base 13. The interior of the base center positioning hole 71 is a spiral structure. The height adjustment plate is fixedly connected to the base 13 by bolts. At the same time, a height adjustment plate connecting hole 73 is set at the corresponding position of the lower end surface of the height adjustment plate and the base 13 to increase or decrease the height adjustment plate to reach the required height. Specifically, the height adjustment plate includes an upper height adjustment plate 74 and a lower height adjustment plate 72. The upper height adjustment plate 74 is arranged below the lower height adjustment plate 72 and connected through the height adjustment plate connecting hole 73. According to the experimental requirements, the number of the upper height adjustment plates 74 is adjusted to achieve the height required for the experiment. Two hydraulic cylinder positioning holes 75 are symmetrically designed at the upper end of the upper height adjustment plate 74, and the hydraulic cylinder 81 is clamped in the center of the hydraulic cylinder positioning hole 75 to prevent unbalanced loading.

[0051] Furthermore, the monitoring mechanism 5 includes a T-shaped column 51, an upper baffle 52 and a lower baffle 53. The lower end of the T-shaped column 51 is fixed on the base 13. The upper baffle 52 and the lower baffle 53 are nested on the T-shaped column 51 through four baffle guide blocks 54. A hydraulic cylinder 1 56 is placed between the top of the T-shaped column 51 and the upper baffle 52; the lower end of the lower baffle 53 is respectively connected to the hydraulic cylinder 2 81 and the hydraulic spring 83; a laser distance sensor 3 57 is arranged at the upper end of the lower baffle 53, and a matching laser receiver 3 58 is arranged on the auxiliary testing mechanism 8.

[0052] In this embodiment, see Figure 2 and Figure 4As shown, four T-shaped columns 51 are installed on the base 13, arranged in a square surrounding manner, and the upper baffle 52 and the lower baffle 53 are nested and connected to the T-shaped column 51 through the baffle guide block 54. The guide block is a cubic structure, and eight guide wheels 55 are used inside. Two guide wheels 55 are arranged on each side, sliding on the T-shaped column 51 to ensure that the upper baffle 52 and the lower baffle 53 remain horizontal when moving up and down, so that no eccentric load occurs when the impact load is loaded. A hydraulic cylinder 1 56 is installed between the T-shaped column 51 and the upper end of the upper baffle 52. The upper baffle 52 moves downward through the loading of the hydraulic cylinder 1 56, squeezing the loading pressure head 62, and applying a static load to the sample 65; the number of hydraulic cylinders 1 56 is two, which are respectively arranged on both sides of the upper end of the upper baffle 52. The lower end of the lower baffle 53 is connected to the hydraulic cylinder 2 81 through the hydraulic cylinder impact head 82, and is fixedly connected to the upper end of the hydraulic spring 83. A laser distance sensor 3 57 is arranged at the upper end of the lower baffle 53, and a matching laser receiving sensor 3 is arranged at the upper end of the height adjustment plate. When the impact load is applied, the hydraulic spring 83 is squeezed, and the spring deformation is obtained through the data of the laser distance sensor 3 57 and the laser receiver 3 58. The work done by the lower baffle 53 on the hydraulic spring 83 can be calculated by Hooke's law. The hydraulic cylinder impact head 82 is impacted at the same time, and the hydraulic oil inside the hydraulic cylinder 2 81 is squeezed into the cylinder 2 86 through the oil pipe 84. The hydraulic oil pushes the piston 87 in the cylinder to squeeze out the gas in the cylinder 2 86. The value of the pressure gauge 88 is observed, that is, the work done by the compressed gas is obtained. The sum of the work done by squeezing the hydraulic spring 83 and the compressed gas is the residual impact energy after the sample 65 absorbs the energy. Among them, a check valve 85 is arranged in the middle of the oil pipe 84 to prevent the hydraulic oil from flowing back.

[0053] Preferably, the lifting mechanism 3 also includes a small automatic winch 35 and a steel wire rope 36 , and the small winch is fixed at the lower end of the top plate; one end of the steel wire rope 36 is connected to the small winch, and the other end is connected to the upper end of the monitoring mechanism 5 .

[0054] In this embodiment, see Figure 1 and Figure 2As shown, the small winch is fixed at the lower end of the top plate and deviates from the center of the top beam 11. A weight guide rail 16 is installed at the center of the top beam 11. The weight guide rail 16 adopts a hollow cylindrical rod. A wire rope 36 passes through the inside of the weight guide rail 16, and the two ends of the wire rope 36 are respectively connected to the small automatic winch 35 and the upper baffle 52 of the monitoring mechanism 5. A steel wire rope 36 is connected to the center position of the upper baffle 52, a laser distance sensor 37 is installed on the top of one of the T-shaped columns 51, and a laser receiver 38 is installed at the corresponding position on the upper baffle 52, and the laser distance sensor 37 is connected to the computer control end; during impact loading, the upper baffle 52 is displaced downward, and when the displacement change rate is zero, it indicates that the impact load has been applied. In order to prevent the heavy hammer mechanism 4 from bouncing upward and then falling down to produce a secondary impact on the sample 65, when the laser distance sensor 37 detects that the displacement data change rate of the upper baffle 52 is 0, the computer control end starts the small automatic winch 35 and pulls the steel wire rope 36 to drag the upper baffle 52 upward to create a certain distance from the loading pressure head 62 of the sample mechanism 6, to ensure that the impact caused by the secondary fall of the heavy hammer mechanism 4 cannot act on the sample 65, thereby effectively avoiding secondary impact.

[0055] See also Figure 2 As shown, the first weight 43, the weight 45 and the impact end weight 46 are all hollowed out with a cylindrical center, and the diameter of the cylindrical hollow is slightly larger than the outer diameter of the weight guide rail 16. The first weight 43, the weight 45 and the impact end weight 46 are all sleeved on the weight guide rail 16 and slide up and down along the weight guide rail 16 to prevent eccentric load during impact. Lubricating oil is applied between the first weight 43, the weight 45 and the impact end weight 46 and the guide rail to reduce friction resistance.

[0056] Preferably, the sample mechanism 6 includes a sample sealing box 61, in which a sample 65 is arranged, and the sample 65 is connected to the upper baffle 52 through a loading pressure head 62; an inflation tube 63 is arranged at the upper end of the sample 65 loading box, and an observation port 64 is opened on the side of the sample 65 loading box.

[0057] In this embodiment, see Figure 2 , Figure 4 and Figure 5As shown, the sample sealing box 61 is arranged between the upper baffle 52 and the lower baffle 53, and specifically, there is a gap between the top of the sample sealing box 61 and the lower end of the upper baffle 52. The sample 65 is placed in the sample sealing box 61, the upper end of the loading pressure head 62 contacts the lower end surface of the upper baffle 52, and the lower end of the loading pressure head 62 contacts the sample 65, and the force is transmitted to the sample 65 through the loading pressure head 62. An air-filling tube 63 is arranged on the sample sealing box 61 to simulate the composite disaster, and an observation port 64 is arranged on the side of the sample 65 loading box to observe the loading process of the sample 65. Hydraulic springs 83 of different stiffness are selected according to the experimental needs, and sufficient space is left between the upper baffle 52 and the lower baffle 53. According to the experimental needs, a clamping device for the sample 65 is added or the environment of the sample 65 is modified, such as adding gas or liquid around the sample 65, so as to meet different experimental needs.

Claims

1. A composite dynamic disaster simulation experimental device under cyclic dynamic load conditions, comprising a main support mechanism, characterized in that: The main body supporting mechanism includes a top beam, a base and a column vertically supported between the top beam and the base. A driving mechanism is provided at the lower end of the top beam, and the driving mechanism is connected to the lifting mechanism, and the lifting mechanism is connected to the heavy hammer mechanism. An auxiliary testing mechanism and a monitoring mechanism are provided on the base, and the monitoring mechanism is provided above the auxiliary testing mechanism and connected to the auxiliary testing mechanism; a sample mechanism is provided in the monitoring mechanism.

2. The composite dynamic disaster simulation experimental device under cyclic dynamic load conditions according to claim 1 is characterized in that: The main body support mechanism also includes a screw positioning block and a rotating screw, and the two ends of the rotating screw are respectively connected to the top beam and the base through the screw positioning block; the driving mechanism is rotationally connected to the lifting mechanism through the rotating screw.

3. The composite dynamic disaster simulation experimental device under cyclic dynamic load conditions according to claim 2 is characterized in that: The lifting mechanism includes a lifting device beam, both ends of which are rotatably connected to a rotating screw, a laser distance sensor is provided at the lower end of the lifting device beam, a laser receiver matching it is provided at the upper end of the monitoring mechanism, and the laser distance sensor is electrically connected to a computer.

4. The composite dynamic disaster simulation experimental device under cyclic dynamic load conditions according to claim 1 is characterized in that: The weight mechanism comprises an electromagnet and a first weight, wherein the electromagnet is arranged at the lower end of the lifting mechanism, and the lifting mechanism absorbs the first weight through the electromagnet.

5. The composite dynamic disaster simulation experimental device under cyclic dynamic load conditions according to claim 4 is characterized in that: A first weight positioning hole is provided at the center of the lower end of the electromagnet, and a protrusion matching the first weight positioning hole is provided at the upper end of the first weight; an accumulator is provided between the electromagnet and the first weight; The lower end of the first weight is connected to an impact weight, a weight connecting hole is provided at the lower end of the first weight, a threaded protrusion is provided at the upper end of the impact weight, and the impact weight is screwed to the first weight through the threaded protrusion and the first weight positioning hole.

6. The composite dynamic disaster simulation experimental device under cyclic dynamic load conditions according to claim 5 is characterized in that: A plurality of increasing and decreasing weights are arranged between the first weight and the impact weight, a threaded protrusion is arranged at the upper end of each increasing and decreasing weight, and a weight connecting hole is arranged at the lower end of each increasing and decreasing weight.

7. The composite dynamic disaster simulation experimental device under cyclic dynamic load conditions according to claim 1 is characterized in that: The system comprises a hydraulic spring, a second hydraulic cylinder and a second air cylinder; the second hydraulic cylinder is connected to the monitoring mechanism via the hydraulic spring, and the second air cylinder is connected to the second hydraulic cylinder via an oil pipe.

8. The composite dynamic disaster simulation experimental device under cyclic dynamic load conditions according to claim 7 is characterized in that: The monitoring mechanism includes a T-shaped column, an upper baffle and a lower baffle. The lower end of the T-shaped column is fixed on the base. The upper baffle and the lower baffle are nested on the T-shaped column through four baffle guide blocks. A hydraulic cylinder 1 is placed between the top of the T-shaped column and the upper baffle. The lower end of the lower baffle is respectively connected to a hydraulic cylinder 2 and a hydraulic spring. A laser distance sensor 2 is arranged on the upper end of the lower baffle, and a laser receiver 2 matched with it is arranged on the auxiliary testing mechanism.

9. The composite dynamic disaster simulation experimental device under cyclic dynamic load conditions according to claim 8 is characterized in that: The sample mechanism comprises a sample sealing box, in which the sample is arranged, and the sample is connected to the upper baffle through a loading pressure head; an air filling pipe is arranged at the upper end of the sample loading box, and an observation port is opened at the side of the sample loading box.

10. The composite dynamic disaster simulation experimental device under cyclic dynamic load conditions according to claim 1 is characterized in that: The lifting mechanism includes a small automatic winch and a steel wire rope, wherein the small winch is fixed at the lower end of the top plate; one end of the steel wire rope is connected to the small winch, and the other end is connected to the upper end of the monitoring mechanism.

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