Drop hammer impact experiment device

Abstract

The utility model relates to the technical field of mine water hole blasting filling rock debris, in particular to a drop hammer impact experiment device. The loading cylinder and the dowel bar are fixed through the base, then the drop hammer slides down through the guide rail and hits the conical block, force is transmitted to rock debris of the loading cylinder through the dowel bar, and finally pressure at different positions on the wall of the loading cylinder is measured through the strain gauge on the loading cylinder. According to the utility model, the magnitude of pressure applied to different positions of the blast hole wall by filling rock debris with different particle size ratios can be effectively reflected, and then the optimal filling particle size ratio can be analyzed, so that the utilization rate of explosives is improved, and the blasting cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of mine water hole blasting and rock chip filling, in particular to a drop hammer impact test device. Background Art

[0002] Blasting holes are a common phenomenon in the process of blasting water holes in open-pit mines. The quality of filling in water hole blasting is the main reason affecting water hole blasting holes. When the pressure exerted on the blasthole wall by filling materials with different particle size ratios is greater, the more effectively the filling materials can be suppressed from rushing out of the blasthole quickly, thereby effectively reducing the occurrence of punching holes. It can also prevent the energy generated by the explosives from overflowing quickly, thereby improving the utilization rate of the explosive energy, so as to reduce the cost of blasting. Therefore, it is very necessary to explore the pressure exerted on different positions of the blasthole wall by different particle size ratios of water hole filling cuttings when they rush out of the blasthole. However, the working conditions at the blasting site are complex, and it is almost impossible to directly measure the pressure exerted on the blasthole wall by filling materials with different particle sizes. Summary of the invention

[0003] In order to solve the above problems, the utility model provides a drop hammer impact test device, which can effectively ensure the filling quality after obtaining the most suitable particle size ratio for filling, thereby effectively reducing the occurrence of punching phenomenon, improving the utilization rate of explosive energy, and reducing blasting costs.

[0004] The utility model is implemented by the following scheme:

[0005] A drop hammer impact test device comprises a charging barrel and a force transmission rod fixed on a base, and an impact part that forms an impact load on the material in the charging barrel;

[0006] The top of the charging barrel is connected to the bottom of the force transmission rod, the force transmission rod can slide up and down along the inner wall of the charging barrel, a strain gauge is provided on the barrel wall of the charging barrel, the strain gauge is connected to the ultra-dynamic strain gauge, the ultra-dynamic strain gauge is connected to the computer, and a laser switch cover plate structure is provided at the bottom of the charging barrel, which is wirelessly connected to the laser sensing probe;

[0007] The impact part includes a conical block, a connecting rod, a drop hammer guide rail, and a drop hammer. The top of the force transmission rod is in contact with the smaller end of the conical block, and the larger end of the conical block is connected to the bottom of the connecting rod. The top of the connecting rod is connected to the bottom of the drop hammer guide rail, and the top of the connecting rod can slide along the inside of the drop hammer guide rail. The drop hammer guide rail is provided with a drop hammer that can slide along it.

[0008] Furthermore, the base includes a base bracket, a base top plate, a fixed bracket, and a base bottom plate which are installed on the base bracket from top to bottom in sequence; the loading barrel is fixed by the base bottom plate and a fixed bracket, and the force transmission rod is fixed by the base top plate and another fixed bracket, and the force transmission rod can move freely between the fixed bracket and the base top plate, so that the force transmission rod slides up and down along the inner wall of the loading barrel.

[0009] Furthermore, a rubber layer is provided at the contact portion between the fixing bracket and the outer wall of the charging barrel.

[0010] Furthermore, a cushion block is installed at the contact position between the charging barrel and the force transmission rod.

[0011] Furthermore, the laser switch cover structure includes a cover and a laser sensor switch, both of which are arranged at the bottom of the charging barrel. The laser sensor probe is located at the contact surface between the drop hammer and the conical block. The laser sensor switch opens the cover after receiving the signal from the laser sensor probe.

[0012] Furthermore, the surface of the conical block is wrapped by a buffer gasket made of rubber.

[0013] Furthermore, the back of the drop hammer guide rail has a through protrusion from top to bottom, which is fixed to the wall. The drop hammer is in a circular ring shape, has a notch consistent with the protrusion of the drop hammer guide rail, and is sleeved on the drop hammer guide rail. Beneficial Effects

[0014] The utility model can effectively reflect the pressure exerted by the rock cuttings with different particle size ratios at different positions on the blasthole wall, and then analyze the best filling particle size ratio. The device fixes the charging barrel and the force transmission rod through the base, and then the drop hammer slides down through the guide rail, hits the conical block and transmits the force to the rock cuttings of the charging barrel through the force transmission rod, and finally measures the pressure at different positions on the charging barrel wall through the strain gauge on the charging barrel, and analyzes the energy dissipation through the pressure at different positions. The greater the pressure, the greater the friction between the filling material and the barrel wall, and the longer the time the filling material stays in the charging barrel, so the energy dissipation acting on the barrel wall is relatively less, and then analyzes the filling effect of the filling materials with different particle size ratios, and then obtains the most suitable filling material particle size and its ratio, so as to achieve the problem of improving the utilization rate of explosives and reducing blasting costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the drop weight impact test device;

[0016] Figure 2 This is a schematic diagram of the structure of the laser switch cover of the drop hammer impact test device;

[0017] Figure 3 It is a schematic diagram of the top view of the drop weight guide rail and the drop weight of the drop weight impact test device;

[0018] The parts in the attached drawings are: base bottom plate 1, base bracket 2, loading barrel 3, fixed bracket 4, base top plate 5, laser sensing probe 6, buffer gasket 7, drop hammer guide rail 8, drop hammer 9, connecting rod 10, conical block 11, force transmission rod 12, gasket 13, strain gauge 14, laser switch cover plate structure 15, ultra-dynamic strain gauge 16, computer 17, cover plate 18, laser sensing switch 19. DETAILED DESCRIPTION

[0019] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0020] like Figure 1 As shown, a drop hammer impact test device comprises a charging barrel 3 and a force transmission rod 12 fixed on a base, and an impact part that forms an impact load on the material in the charging barrel 3;

[0021] The top of the charging barrel 3 is connected to the bottom of the force transmission rod 12, and the force transmission rod 12 can slide up and down along the inner wall of the charging barrel 3. A strain gauge 14 is provided on the wall of the charging barrel 3, and the strain gauge 14 is connected to the ultra-dynamic strain gauge 16, and the ultra-dynamic strain gauge 16 is connected to the computer 17. The bottom of the charging barrel 3 is provided with a laser switch cover plate structure 15, which is wirelessly connected to the laser sensing probe 6;

[0022] The impact part includes a conical block 11, a connecting rod 10, a drop hammer guide rail 8, and a drop hammer 9. The top of the force transmission rod 12 is in contact with the smaller end of the conical block 11, and the larger end of the conical block 11 is connected to the bottom of the connecting rod 10. The top of the connecting rod 10 is connected to the bottom of the drop hammer guide rail 8. The top of the connecting rod 10 can slide along the inside of the drop hammer guide rail 8. The connecting rod 10 is thick at the top and thin at the bottom and is inserted into the hole at the bottom of the drop hammer guide rail 8, which can ensure that the conical block 11 splashes under the high-speed impact of the drop hammer 9. The drop hammer guide rail 8 is provided with a drop hammer 9 that can slide along it.

[0023] The base includes a base support 2, a base bottom plate 1, a fixed support 4, and a base top plate 5 which are sequentially installed on the base support 2 from top to bottom. In this embodiment, two fixed supports 4 are provided, such as Figure 1 As shown, the base support 2 includes four columns, and the fixed support 4 is fixed on two diagonal columns. The two fixed supports 4 are staggered in direction, making the entire base more stable. The charging barrel 3 is fixed by the base bottom plate 1 and a fixed support 4, and the force transmission rod 12 is fixed by the base top plate 5 and another fixed support 4. The force transmission rod 12 can move freely between the fixed support 4 and the base top plate 5, so that the force transmission rod 12 slides up and down along the inner wall of the charging barrel 3. During the test, lubricant must be applied to the contact part between the fixed support 4 and the base top plate 5 and the force transmission rod 12.

[0024] The contact part between the fixed bracket 4 and the outer wall of the charging barrel 3 is provided with a rubber layer to prevent the force on the barrel wall from being directly transmitted to the bracket and affecting the test results. A cushion block 13 is installed at the contact position between the charging barrel 3 and the force transmission rod 12.

[0025] like Figure 2 The figure shows a schematic diagram of the bottom structure of the charging barrel 3. The bottom of the charging barrel 3 extends out of the base bottom plate 1, and the extended part is surrounded by the laser switch cover plate structure 15. The laser switch cover plate structure 15 includes a cover plate 18 and a laser sensor switch 19, both of which are arranged at the bottom of the charging barrel 3. The laser sensor probe 6 is fixed on the base top plate 5 and is located at the contact surface between the drop hammer 9 and the conical block 11, ensuring that before the force impacts the rock cuttings, the laser sensor switch 19 opens the cover plate 18 after receiving the signal of the laser sensor probe 6, which does not affect the test results.

[0026] Specifically, the surface of the conical block 11 is wrapped by a rubber buffer pad 7 to prevent the conical block 11 from damaging the base top plate 5. The conical block 11 can prevent the drop weight 9 from directly contacting the force transmission rod 12. The uneven force on the rod will make it difficult for the device to maintain balance as a whole. It can also reduce the contact area with the force transmission rod 12, ensuring that a larger load reaches the charging barrel 3 when the impact speed of the drop weight 9 is the same.

[0027] like Figure 3 As shown, the back of the drop hammer guide rail 8 has a through protrusion from top to bottom, which can be well fixed on the wall without affecting the smooth sliding of the drop hammer 9. The drop hammer 9 is in a circular ring shape, has a notch consistent with the protrusion of the drop hammer guide rail 8, and is sleeved on the drop hammer guide rail 8.

[0028] In this embodiment, the wall of the charging barrel 3 is firstly polished with sandpaper and wiped with alcohol, three strain gauges 14 are sequentially attached to the wall of the charging barrel 3, and then the ultra-dynamic strain gauge 16 and the computer 17 are connected to start the test. The specific steps are as follows:

[0029] 1) Preliminary preparation: Place the base on a flat ground, fix the drop weight guide rail 8 on the wall, and ensure that the drop weight guide rail 8, the conical block 11, the force transmission rod 12, and the charging barrel 3 are in a straight line. After the strain gauge 14, the ultra-dynamic strain gauge 16, and the computer 17 are connected, perform simple debugging to ensure that data can be measured during the test.

[0030] 2) Cover and lock the cover plate 18 to ensure that the cuttings do not leak out from the bottom of the charging barrel 3, then take out the force transmission rod 12, load the cuttings into the charging barrel 3, place the cushion block 13 in the charging barrel 3, and finally put the force transmission rod 12 back to its original position.

[0031] 3) Debug the ultra-dynamic strain gauge 16 to the working state on the computer 17, then place the drop weight 9 at the designated position, ensure that all personnel around the device are within the safe range, slide the drop weight 9 off the drop weight guide rail 8, and then save the measured stress-strain data on the computer 17.

[0032] 4) When the drop hammer 9 falls, the laser sensing probe 6 is triggered. After receiving the signal, the laser switch 19 pops open, the cover plate 18 is opened, the rock chips that are flushed out are collected, the residue in the charging barrel 3 is cleaned, the pad 13 and the force transmission rod 12 are wiped clean and put back to their original positions, and the strain gauge 14 is checked for any impact to ensure that data can be collected normally.

[0033] It should be noted that those skilled in the art should be aware that the actions described and involved in the specification are not necessarily necessary for the present invention, and the contents described are only preferred implementation cases of the present invention and cannot be considered to limit the scope of implementation of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as a limitation on the present invention.

Claims

1. A drop weight impact test device, characterized in that: It comprises a charging barrel (3) and a force transmission rod (12) fixed on a base, and an impact part for applying an impact load to the material in the charging barrel (3); The top of the loading barrel (3) is connected to the bottom of the force transmission rod (12), the force transmission rod (12) can slide up and down along the inner wall of the loading barrel (3), a strain gauge (14) is provided on the barrel wall of the loading barrel (3), the strain gauge (14) is connected to the ultra-dynamic strain gauge (16), the ultra-dynamic strain gauge (16) is connected to the computer (17), and a laser switch cover structure (15) is provided at the bottom of the loading barrel (3), which is wirelessly connected to the laser sensing probe (6); The impact part comprises a conical block (11), a connecting rod (10), a drop hammer guide rail (8), and a drop hammer (9); the top of the force transmission rod (12) contacts the end of the conical block (11) with a smaller area, the end of the conical block (11) with a larger area is connected to the bottom of the connecting rod (10); the top of the connecting rod (10) is connected to the bottom of the drop hammer guide rail (8); the top of the connecting rod (10) can slide along the inside of the drop hammer guide rail (8), and the drop hammer (9) is provided on the drop hammer guide rail (8) and can slide along it.

2. A drop weight impact test device according to claim 1, characterized in that: The base comprises a base support (2), a base top plate (5), a fixed support (4), and a base bottom plate (1) which are sequentially mounted on the base support (2) from top to bottom; the loading barrel (3) is fixed by the base bottom plate (1) and a fixed support (4); the force transmission rod (12) is fixed by the base top plate (5) and another fixed support (4); the force transmission rod (12) can move freely between the fixed support (4) and the base top plate (5), so that the force transmission rod (12) slides up and down along the inner wall of the loading barrel (3).

3. A drop weight impact test device according to claim 2, characterized in that: The portion of the fixed bracket (4) in contact with the outer wall of the charging barrel (3) is provided with a circle of rubber layer.

4. A drop weight impact test device according to claim 1 or 2, characterized in that: A cushion block (13) is installed at the contact position between the charging barrel (3) and the force transmission rod (12).

5. A drop weight impact test device according to claim 1, characterized in that: The laser switch cover plate structure (15) comprises a cover plate (18) and a laser sensor switch (19), both of which are arranged at the bottom of the charging barrel (3), the laser sensor probe (6) is located at the contact surface between the drop weight (9) and the conical block (11), and the laser sensor switch (19) opens the cover plate (18) after receiving a signal from the laser sensor probe (6).

6. A drop weight impact test device according to claim 1, characterized in that: The surface of the conical block (11) is wrapped by a buffer gasket (7) made of rubber.

7. A drop weight impact test device according to claim 1, characterized in that: The back of the drop-hammer guide rail (8) has a through protrusion from the top to the bottom and is fixed to the wall. The drop-hammer (9) is in a circular ring shape and has a notch that is consistent with the protrusion of the drop-hammer guide rail (8) and is sleeved on the drop-hammer guide rail (8).

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