Device with rock hopkinson impact test monitoring protection and fragment screening

Abstract

The utility model relates to deep rock and soil engineering anti-scouring support and rock dynamics test equipment technical field provides a kind of device with rock hopkinson impact test monitoring protection and fragment screening. The device includes, iron stand, high-strength bulletproof glass protection cover is equipped on the iron stand, high-strength bulletproof glass protection cover is equipped with circular hole on the opposite two side walls, to two root for separating type hopkinson bar rock sample clamping, located the just below of high-strength bulletproof glass protection cover, iron stand is connected by magnetic attraction flexible non-woven fabric connecting device and is connected particle size sieve, the particle size sieve includes multiple different aperture circular sieve, the particle size sieve is placed on vibration table. The utility model can prevent spatter, and high light transmittance bulletproof glass protection monitoring lens also does not affect monitoring effect.

Description

Technical Field

[0001] This utility model relates to the technical field of erosion control and support for deep geotechnical engineering and rock dynamics testing equipment, and in particular to a device that combines rock Hopkinson impact test monitoring and protection with fragment screening. Background Technology

[0002] The statements in this section are merely background information related to this utility model and do not necessarily constitute prior art.

[0003] For rock dynamic hazards such as rock bursts and rockbursts in geotechnical engineering, one of the most common research methods is the split Hopkinson bar impact test. The Hopkinson bar test primarily studies the dynamic mechanical properties and failure mechanisms of rocks under medium to high strain rates. Rock samples break down under impact, and the failure morphology varies under different impact conditions. When a rock sample is subjected to high-speed impact, it breaks into fragments. Protective devices are needed to prevent fragments from flying and injuring test personnel and monitoring equipment such as DIC digital speckle cameras. Furthermore, fragment fragmentation is difficult to collect, and there is a lack of automatic particle size sieving devices, making it inconvenient to collect data on fragment size and mass distribution. Utility Model Content

[0004] To address the technical problems mentioned above, this invention provides a device that supports safety protection, debris collection, and automatic sieving and weighing during Hopkinson bar impact tests on rock masses or anchored rock masses. It prevents debris from splashing, and the high-transmittance bulletproof glass protects the monitoring lens without affecting the monitoring effect. The device is enclosed and dust-free, enabling automatic debris collection, sieving, and weighing, facilitating the acquisition of data on the size and mass distribution of impact debris. It is convenient and efficient to operate. This provides an experimental basis for in-depth research into the dynamic failure process and mechanism of rock / anchored rock.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: This utility model provides a device that combines monitoring and protection for rock Hopkinson impact testing with fragment sieving, comprising: an iron frame, on which a high-strength bulletproof glass protective cover is provided, and circular holes are provided on two opposite side walls of the high-strength bulletproof glass protective cover, with two detachable Hopkinson rods clamping the rock sample, located directly below the high-strength bulletproof glass protective cover; the iron frame is connected to a particle size sieve via a magnetic flexible non-woven fabric connecting device, the particle size sieve comprising multiple circular sieves with different apertures, and the particle size sieve is placed on a vibrating table.

[0006] Furthermore, the high-strength bulletproof glass protective cover includes a left vertical glass, a right vertical glass, a front vertical glass, a rear vertical glass, and an upper glass. The left vertical glass, right vertical glass, front vertical glass, and rear vertical glass are connected by adhesive. The upper glass is connected to the rear vertical glass by a buckle at the top of the protective cover, and the upper glass is connected to the front vertical glass by a hinge.

[0007] Furthermore, the lower part of the high-strength bulletproof glass protective cover is provided with a fixing buckle for fixing the high-strength bulletproof glass protective cover onto the iron frame.

[0008] Furthermore, the iron frame includes four telescopic rods, adjusting bolts, a top angle iron of the iron frame, and an angle iron frame. The telescopic rods are equipped with adjusting bolts to control the height of the iron frame. The top angle iron of the iron frame is installed on the four telescopic rods by fixing bolts. The angle iron frame is placed in the middle of the top angle iron of the iron frame and is used to mount a high-strength bulletproof glass protective cover.

[0009] Furthermore, the top angle iron of the iron frame is provided with several circular holes, which are used to adjust the position of the iron frame and the high-strength bulletproof glass protective cover by cooperating with the fixing bolts.

[0010] Furthermore, the angle iron frame is provided with a protective cover buckle fixing piece for fixing the high-strength bulletproof glass protective cover.

[0011] Furthermore, the magnetic flexible nonwoven fabric connecting device includes a flexible nonwoven fabric tube, the upper edge of which is provided with an upper square magnetic strip, and the lower edge is provided with a lower circular magnetic strip. The upper square magnetic strip is magnetically connected to the angle iron frame, and the lower circular magnetic strip is magnetically connected to the particle size screen.

[0012] Furthermore, the particle size sieve includes multiple circular sieves with gradually decreasing apertures from top to bottom, and adjacent circular sieves are connected by circular sieve snap-fits.

[0013] Furthermore, the particle size sieve is placed on the circular sieve slot at the top of the vibrating table, and the particle size sieve is fixed by the bottom circular sieve fixing buckle and the bottom circular sieve fixing piece.

[0014] Furthermore, a test monitoring device is installed above the high-strength bulletproof glass protective cover.

[0015] Compared with the prior art, the beneficial effects of this utility model are: This invention features a fully transparent, high-transmittance bulletproof glass protective cover on the outside of the sample, improving the clarity of sample damage monitoring and preventing debris from flying and injuring test personnel and the test monitoring camera lens during impact testing. Sample debris can be effectively collected through the protective cover and automatically sieved and weighed by an automatic sieving device, facilitating debris morphology analysis and obtaining data on fragment size and mass distribution. A flexible layer is provided at the edge of the circular hole in the glass protective cover to prevent wear and damage to the Hopkinson rod. The iron stand is connected to angle iron with bolts, facilitating disassembly and position adjustment. Furthermore, this invention has a simple structure and is easy to operate, effectively improving the clarity of damage monitoring, test efficiency, and safety. Attached Figure Description

[0016] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0017] Figure 1 This is a schematic diagram of the structure of a device that combines rock Hopkinson impact test monitoring and protection with fragment screening, as shown in an embodiment of this utility model. Figure 2 This is a schematic diagram of the structure of the high-strength bulletproof glass protective cover shown in an embodiment of the present invention; Figure 3 This is a schematic diagram of the iron frame platform shown in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the magnetic flexible nonwoven fabric connecting device shown in the embodiment of this utility model; Figure 5 This is a schematic diagram of the structure of a single circular sieve shown in an embodiment of the present invention; Figure 6 This is a front view of the complete set of circular sieves shown in this embodiment of the utility model; Figure 7 This is a schematic diagram of the structure of the vibration table shown in an embodiment of the present invention; The components include: 1. High-strength bulletproof glass protective cover; 2. Iron stand; 3. Magnetic flexible non-woven fabric connecting device; 4. Particle size sieve; 5. Vibrating table; 6. Rock sample; 7. Split-type Hopkinson bar; 8. Test monitoring device (high-speed camera, DIC digital speckle camera, etc.); 9. Circular hole on the right side of the glass protective cover; 10. Circular hole on the left side of the glass protective cover; 11. Flexible protective layer on the edge of the circular hole; 12. Hinge; 13. Buckle on the top of the protective cover; 14. Fixing clip. 15. Buckle, 16. Telescopic rod, 17. Adjusting bolt, 18. Angle iron at the top of the iron frame, 19. Circular hole, 20. Fixing bolt, 21. Angle iron frame, 22. Protective cover buckle fixing piece, 23. Square magnetic strip at the top of the non-woven fabric, 24. Circular magnetic strip at the bottom of the non-woven fabric, 25. Flexible non-woven fabric tube, 26. Circular sieve, 27. Circular sieve buckle, 28. Bottom circular sieve fixing buckle, 30. Vibrating table power supply, 31. Circular sieve slot, 32. Bottom circular sieve buckle fixing piece. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0020] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0021] This invention provides a device that combines monitoring and protection for rock Hopkinson impact tests with fragment screening, such as... Figure 1 As shown, the device includes: a high-strength bulletproof glass protective cover 1, an iron frame 2, a magnetic flexible non-woven fabric connecting device 3, a particle size sieve 4, and a vibration table 5. The high-strength bulletproof glass protective cover 1 is placed on the iron frame 2, and it can be used in conjunction with a split Hopkinson bar test system and a monitoring system to conduct dynamic impact tests on rocks or anchored rocks.

[0022] The high-strength bulletproof glass protective cover 1 is made of high-strength bulletproof glass and consists of left vertical glass, right vertical glass, front vertical glass, and rear vertical glass connected by adhesive. The upper horizontal glass is connected to the rear vertical glass on one side by a hinge and to the front vertical glass on the other side by a buckle. The opening and closing of the upper glass can be controlled by the buckle. There is no glass at the bottom.

[0023] like Figure 2 As shown, the high-strength bulletproof glass protective cover 1 has a circular hole 10 on the left side of the left vertical glass for the detachable Hopkinson rod 7 to pass through, and a circular hole 9 on the right vertical glass for the detachable Hopkinson rod 7 to pass through. This prevents fragments from flying when the rock sample 6 is impacted, protecting the test personnel and test monitoring device 8, and enabling automatic collection of test debris, facilitating the analysis of the fragment size and mass distribution of the rock sample 6. Furthermore, the edges of the circular holes 9 on the right and 10 on the left are equipped with flexible protective layers 11 to prevent smaller fragments from flying out and to prevent wear and damage to the Hopkinson rod during the test.

[0024] The high-strength bulletproof glass protective cover 1 is equipped with a hinge 12 and a top buckle 13 on the upper part, which makes it convenient to open the protective cover to place the rock sample 6 during the experiment; the glass protective cover is equipped with a fixing buckle 14 at the lower part, which is used to fix the glass protective cover 1 to the iron stand 2.

[0025] like Figure 3 As shown, the iron frame 2 is formed by bolting a telescopic rod 15 to the top angle iron 17 of the iron frame. The telescopic rod 15 is equipped with an adjusting bolt 16, which can be used to control the height of the iron frame 2. The upper part of the iron frame 2 is composed of a U-shaped frame formed by angle irons connected by fixing bolts 19. The inner angle iron frame is sized to match the high-strength bulletproof glass protective cover 1, and the two side angle iron frames 20 are equipped with buckles for fixing the high-strength bulletproof glass protective cover 1.

[0026] The angle iron frame is provided with equidistant circular holes 18. The position of the iron frame 2 and the position of the high-strength bulletproof glass protective cover 1 can be reasonably adjusted through the circular holes 18 and fixing bolts 19 to avoid affecting the test.

[0027] like Figure 4 As shown, the magnetic flexible nonwoven fabric connecting device 3 includes a flexible nonwoven fabric cylinder 24 with a rounded top and a rounded bottom. The upper edge is provided with a square magnetic strip 22 on the upper part of the nonwoven fabric, and the lower edge is provided with a circular magnetic strip on the lower part of the nonwoven fabric. It is magnetically connected to the angle iron frame 20 supporting the glass cover at the top and to the particle size sieve 4 at the bottom. The flexible nonwoven fabric cylinder 24 can guide the rock debris collected by the high-strength bulletproof glass protective cover 1 into the sieving device, while also ensuring the sealing of the device and avoiding dust contamination during the experiment.

[0028] like Figure 5 , Figure 6 As shown, the particle size sieve 4 includes multiple circular sieves 25 with gradually decreasing apertures from top to bottom. According to relevant literature, the aperture of the particle size sieve 4 can be determined as 30mm (coarse debris), 5mm (medium debris), 0.075mm (fine debris), and the bottommost debris (micro-debris), etc. Alternatively, a matching particle size sieve with an appropriate aperture can be selected according to the specific research situation. Adjacent circular sieves 25 are connected by circular sieve clips 26.

[0029] The vibrating table 5 is provided with a circular sieve slot 30 on the upper part, which is connected to the circular sieve 25, and has a weighing function in a static state.

[0030] like Figure 7 As shown, the vibrating table 5 is placed in a suitable position below the iron frame 2. The circular screens 25 are installed in order of decreasing aperture from top to bottom, and adjacent circular screens 25 are connected and fixed by circular screen clips 26. The circular screens 25 are placed on the circular screen slots 30 at the top of the vibrating table 5, and fixed by the bottom circular screen fixing clips 27 and bottom circular screen fixing pieces 31 to prevent them from falling off during vibration.

[0031] In this embodiment, the operation process of the device that combines rock Hopkinson impact test monitoring and protection with fragment screening is as follows: (1) Based on the actual structure and position of the Hopkinson bar test system, the top angle iron 17 and telescopic rod 15 of the iron frame are assembled into the iron frame 2 through the circular hole 18 and the fixing bolt 19, and the iron frame 2 is adjusted to a suitable height by adjusting the adjusting bolt 16; (2) Place the high-strength bulletproof glass protective cover 1 on the square angle iron frame 20 that supports the glass protective cover on the iron frame 2, and fix the two fixing buckles 14 at the bottom of the glass protective cover to the protective cover buckle fixing piece 21 on the angle iron frame 20. (3) Insert the Hopkinson rod through the circular hole 9 on the right side of the glass cover and the circular hole 10 on the left side of the glass cover of the glass protective box respectively; (4) Open the top buckle 13 of the protective cover, place the rock sample 6 between the Hopkinson rods and align and clamp it, then close the top of the glass protective cover and fix the top buckle 13 of the protective cover. (5) Secure the square magnetic strip above the magnetic flexible nonwoven fabric connecting device 3 to the square angle iron frame 20 that carries the glass protective cover; secure the circular magnetic strip below the flexible nonwoven fabric tube 24 to the circular sieve 25 on the top layer. (6) Select a suitable circular sieve with appropriate aperture according to the specific research situation, install the circular sieve 25 in order of gradually decreasing aperture from top to bottom, and connect and fix adjacent circular sieves with circular sieve buckles 26 to form particle size sieve 4; (7) Place the particle size sieve 4 on the top circular sieve slot 30 of the vibrating table 5, and fix the circular sieve 25 by the bottom circular sieve fixing buckle 27 and the bottom circular sieve fixing piece 31.

[0032] (8) After turning on the power supply 28 of the vibration table, conduct the Hopkinson bar impact test on the rock; (9) After the impact test, turn off the power supply 28 of the vibration table, open the circular magnetic strip 23 at the bottom of the nonwoven fabric, and remove the circular screens 25 one by one from top to bottom. At the same time, the vibration table 5 will automatically weigh, tare and record the data.

[0033] (10) After all the tests are completed, dismantle, clean and properly store all parts of the device.

[0034] This invention provides safety protection, debris collection, and automatic sieving and weighing functions for Hopkinson bar impact tests on rock masses or anchored rock masses. It prevents the danger of flying fragments, and the high-transmittance bulletproof glass does not interfere with monitoring the specimen failure process. Simultaneously, it automatically sieves the debris according to particle size to collect the size and mass distribution of the impact debris. The device is enclosed and dustproof, simple to operate, and provides reliable data, significantly improving testing efficiency and accuracy.

[0035] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device that combines monitoring and protection for rock Hopkinson impact testing with fragment screening, characterized in that, include: The iron frame is equipped with a high-strength bulletproof glass protective cover. The high-strength bulletproof glass protective cover has circular holes on two opposite side walls. Two separate Hopkinson rods are used to clamp the rock sample, which is located directly below the high-strength bulletproof glass protective cover. The iron frame is connected to a particle size sieve through a magnetic flexible non-woven fabric connecting device. The particle size sieve includes multiple circular sieves with different aperture sizes. The particle size sieve is placed on a vibrating table.

2. The device for monitoring and protecting rocks during the Hopkinson impact test and for screening fragments as described in claim 1, characterized in that, The high-strength bulletproof glass protective cover includes a left vertical glass, a right vertical glass, a front vertical glass, a rear vertical glass, and an upper glass. The left vertical glass, right vertical glass, front vertical glass, and rear vertical glass are connected by adhesive. The upper glass is connected to the rear vertical glass by a buckle at the top of the protective cover, and the upper glass is connected to the front vertical glass by a hinge.

3. The device for monitoring and protecting rocks during the Hopkinson impact test and for screening fragments, as described in claim 2, is characterized in that... The high-strength bulletproof glass protective cover is equipped with a fixing buckle at the bottom, which is used to fix the high-strength bulletproof glass protective cover to the iron frame.

4. The device for monitoring and protecting rocks during the Hopkinson impact test and for screening fragments as described in claim 1, characterized in that, The iron frame includes four telescopic rods, adjusting bolts, a top angle iron of the iron frame, and an angle iron frame. The telescopic rods are equipped with adjusting bolts to control the height of the iron frame. The top angle iron of the iron frame is installed on the four telescopic rods by fixing bolts. The angle iron frame is placed in the middle of the top angle iron of the iron frame and is used to mount a high-strength bulletproof glass protective cover.

5. The device for monitoring and protecting rocks during the Hopkinson impact test and for screening fragments as described in claim 4, characterized in that, The iron frame is provided with several circular holes on the top angle iron. These circular holes are used to adjust the position of the iron frame and the high-strength bulletproof glass protective cover by engaging with fixing bolts.

6. The device for monitoring and protecting rocks during the Hopkinson impact test and for screening fragments as described in claim 4, characterized in that, The angle iron frame is equipped with a protective cover buckle fixing piece for fixing the high-strength bulletproof glass protective cover.

7. The device for monitoring and protecting rocks during the Hopkinson impact test and for screening fragments as described in claim 4, characterized in that, The magnetic flexible nonwoven fabric connecting device includes a flexible nonwoven fabric tube. The upper edge of the flexible nonwoven fabric tube is provided with an upper square magnetic strip, and the lower edge is provided with a lower circular magnetic strip. The upper square magnetic strip is magnetically connected to the angle iron frame, and the lower circular magnetic strip is magnetically connected to the particle size screen.

8. The device for monitoring and protecting rocks during the Hopkinson impact test and for screening fragments as described in claim 1, characterized in that, The particle size sieve includes multiple circular sieves with gradually decreasing apertures from top to bottom, and adjacent circular sieves are connected by circular sieve clips.

9. The device for monitoring and protecting rocks during the Hopkinson impact test and for screening fragments as described in claim 1, characterized in that, The particle size sieve is placed on the circular sieve slot at the top of the vibrating table, and the particle size sieve is fixed by the bottom circular sieve fixing buckle and the bottom circular sieve fixing piece.

10. The device for monitoring and protecting rocks during Hopkinson impact testing and for screening fragments according to claim 1, characterized in that, A test monitoring device is installed above the high-strength bulletproof glass protective cover.

Images