Multifunctional draw shaft experiment platform capable of applying confining pressure and experiment method

Abstract

According to the multifunctional draw shaft experiment platform capable of applying confining pressure and the experiment method, a cuttable draw shaft model is movably installed below an inclined chute, the draw shaft model is of a tubular structure and extends vertically, the top end of the draw shaft model is provided with an opening and is located below the discharging end of the inclined chute, and the draw shaft model is matched with a well wall model of a tubular structure; after the draw shaft model is cut, the well wall model is coaxially installed between two cut sections of the draw shaft model, the well wall model is matched with a confining pressure loading mechanism, the confining pressure loading mechanism comprises a plurality of force applying units which apply acting force to the well wall model in the horizontal direction, and all the force applying units surround the peripheral side of the well wall model; the inclined chute is provided with a feeding mechanism in a matched mode, the feeding mechanism is communicated with the feeding end of the inclined chute so as to provide surrounding rock pre-adding and ore rock impact experiment conditions at the ore rock impact position, and therefore experiment research can be conducted on the damage forms and the damage mechanisms of different draw shaft wall structures under the comprehensive action of surrounding rock pressure and ore rock impact.

Description

Technical Field

[0001] The present invention relates to the technical field of mine chute safety prevention and control, and in particular to a multifunctional chute experimental platform and an experimental method capable of applying confining pressure. Background Art

[0002] The chute test platform plays a vital role in the research of mining engineering, geotechnical engineering and material conveying systems. The chute test platform can not only help researchers to deeply understand the flow characteristics of materials in the chute, but also provide valuable data support for actual engineering design and optimization. With the advancement of technology, modern chute test platforms have been significantly improved in functionality and safety.

[0003] The current chute test platform has demonstrated a high degree of professionalism and advancement in suspension system, initial velocity control, chute model design, bottom ore discharge, hydraulic control, lifting system configuration, material level measurement and safety protection. However, the existing chute test platform is often built around the observation of chute ore rock migration trajectory and the study of chute wall damage under ore rock impact, and most of them ignore the factors affecting the surrounding rock pressure that affect the chute wall damage. Summary of the invention

[0004] The purpose of the present invention is to provide a multifunctional chute experimental platform and experimental method capable of applying confining pressure, so as to solve the problems existing in the above-mentioned prior art, and to provide pre-applied surrounding rock and ore-rock impact experimental conditions at the ore-rock impact position, thereby experimentally studying the destruction forms and destruction mechanisms of different chute wall structures under the combined action of surrounding rock pressure and ore-rock impact.

[0005] To achieve the above-mentioned object, the present invention provides the following solution: The present invention provides a multifunctional chute test platform capable of applying confining pressure, comprising a main frame and an inclined chute installed on the main frame;

[0006] A cuttable chute model is movably installed below the inclined chute. The chute model is a tubular structure and extends vertically. An opening is provided at the top of the chute and is located below the discharge end of the inclined chute. The chute model is equipped with a well wall model in a tubular structure. After the chute model is cut, the well wall model is coaxially installed between the two sections of the cut chute model. The well wall model is equipped with a confining pressure loading mechanism for applying confining pressure thereto. The confining pressure loading mechanism includes a plurality of force applying units that apply force to the well wall model in a horizontal direction, and each of the force applying units surrounds the outer peripheral side of the well wall model.

[0007] The inclined chute is equipped with a feeding mechanism for feeding materials thereto, and the feeding mechanism is connected with the feeding end of the inclined chute.

[0008] Preferably, the confining pressure loading mechanism further includes a reaction frame, which is in the shape of an annular frame structure with a vertically extending axis. The shaft wall model is installed on the inner circumferential side of the reaction frame, and the two cut ore pass models are respectively located at the upper and lower positions of the reaction frame.

[0009] There is a gap for installing the force application unit between the shaft wall model and the inner circumferential wall of the reaction frame. One end of the force application unit is installed on the inner circumferential wall of the reaction frame, and the other end abuts against the outer circumferential wall of the shaft wall model.

[0010] Preferably, the confining pressure loading mechanism further includes a plurality of vertically telescopic support rods. Each support rod is evenly distributed at equal intervals along the circumference of the reaction frame, and the bottom end of the support rod is movably installed on the main frame, and the top end of the support rod is connected to the reaction frame.

[0011] Preferably, the main frame includes a bottom frame and a top frame that is movably installed on the bottom frame in the vertical direction; the confining pressure loading mechanism is movably installed on the bottom frame, and the inclined chute is installed on the top frame.

[0012] Preferably, an angle adjustment bracket and an angle adjustment rod are provided on the top frame. The angle adjustment bracket extends horizontally in a direction perpendicular to the width of the inclined chute. The angle adjustment rod is movably supported at the bottom position of the feeding end of the inclined chute and is movably installed on the angle adjustment bracket along the extension direction of the angle adjustment bracket. The discharging end of the inclined chute is rotatably installed on the main frame;

[0013] An angle positioning mechanism for positioning the angle adjustment rod is provided on the angle adjustment bracket.

[0014] Preferably, a position adjustment bracket and a position adjustment rod are provided on the top frame. The position adjustment bracket is located below the angle adjustment bracket and extends parallel to the angle adjustment bracket. The position adjustment rod is movably installed on the position adjustment bracket along the extension direction of the position adjustment bracket and is rotationally matched with the position adjustment bracket. The discharging end of the inclined chute is installed on the position adjustment rod;

[0015] A position positioning mechanism for fixing the position adjustment rod is provided on the position adjustment bracket.

[0016] Preferably, a top bracket is provided on the top frame. The feeding mechanism includes an ore unloading bin located above the inclined chute. The ore unloading bin is movably installed on the top bracket in a direction perpendicular to the width of the inclined chute.

[0017] Preferably, a bottom support located below the confining pressure loading mechanism is provided on the bottom frame. A support frame is provided on the bottom support. A support plate that is movable in the horizontal direction is provided on the support frame. A through hole for the ore pass model to extend downward is formed in the support plate. The confining pressure loading mechanism is movably installed on the support plate. The support frame is in an annular frame structure surrounding the outer peripheral side of the through hole.

[0018] Preferably, a positioning support located between the inclined chute and the confining pressure loading mechanism is provided on the bottom frame. The positioning support surrounds the outer peripheral side of the part of the ore pass model located above the reaction frame and is movably abutted against the outer peripheral wall surface of the ore pass model.

[0019] An experimental method is also provided, including the following steps:

[0020] Adjust the ore discharge bin: The ore discharge bin moves along the top support, or the ore pass model moves on the bottom support;

[0021] Adjust the inclination angle and position of the inclined chute: The position adjustment rod moves along the position adjustment support for adjusting the position of the inclined chute; after the position of the inclined chute is determined, the inclination angle of the inclined chute is adjusted by moving the angle adjustment rod along the angle adjustment support;

[0022] Adjust the size of the ore pass model: By moving the top frame along the bottom frame, the height of the top frame is changed to provide spatial conditions for raising and lowering the ore pass model; by adjusting the positioning support and replacing the support plate with different through holes, the diameter of the ore pass model is adjusted;

[0023] Install a high-speed camera: After the adjustment is completed, install a high-speed camera so that the shooting range of the high-speed camera covers the ore pass model. During the process of ore and rock dropping, the high-speed camera is used to record videos and take pictures throughout the process, and then the migration trajectory of the ore and rock in the ore pass model is obtained by comparing the pictures to clarify the impact position of the ore and rock in the ore pass model;

[0024] Install the shaft wall model: After determining the ore and rock impact range, manufacture the shaft wall model. The height of the shaft wall model is consistent with the height of the ore and rock impact range. Cut the position of the ore pass model corresponding to the ore and rock impact, coaxially install the shaft wall model at the cutting position of the ore pass model, sleeved the reaction frame on the shaft wall model, and install the force application unit, and then adjust the height of the reaction frame through the support rod;

[0025] Start the experiment: Apply confining pressure to the shaft wall model through the force application unit according to the experimental design parameters. After the loading is completed, lower the ore and rock through the ore unloading bin. After lowering the required number of times of ore and rock according to the experimental plan, remove the shaft wall model, and measure and analyze the damage condition of the shaft wall model through equipment such as a borehole camera, so as to realize the experimental study on the damage of the raise shaft wall under the combined action of surrounding rock pressure and ore and rock impact.

[0026] The present invention has achieved the following technical effects compared with the prior art:

[0027] After obtaining the ore and rock impact position in the raise model, the present invention cuts the raise model and replaces its ore and rock impact section with a shaft wall model. Specifically, the shaft wall model is coaxially connected between the two cut raise models, and confining pressure is applied to the shaft wall model through each force application unit to provide pre-applied surrounding rock and ore and rock impact experimental conditions at the ore and rock impact position. Accordingly, the failure forms and failure mechanisms of different raise shaft wall structures under the combined action of surrounding rock pressure and ore and rock impact can be experimentally studied, which increases the basic functions of the traditional raise experimental platform and expands the application range of the traditional raise experimental platform. Description of the Drawings

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0029] Figure 1 It is a schematic diagram of the overall structure in an embodiment of the multi-functional raise experimental platform capable of applying confining pressure disclosed by the present invention;

[0030] Figure 2 It is a top view of the overall structure in an embodiment of the multi-functional raise experimental platform capable of applying confining pressure disclosed by the present invention;

[0031] Figure 3 It is a schematic diagram of the structure in an embodiment of the bottom bracket and the support plate disclosed by the present invention;

[0032] Among them, 1 - ore unloading bin, 2 - top bracket, 3 - inclined chute, 4 - angle adjustment rod, 5 - angle adjustment bracket, 6 - position adjustment rod, 7 - position adjustment bracket, 8 - upper positioning rod, 9 - upper positioning track, 10 - lower positioning track, 11 - lower positioning rod, 12 - reaction frame, 13 - support rod, 14 - support plate, 15 - bottom bracket, 16 - raise model, 17 - shaft wall model, 18 - hydraulic jack, 19 - loading pressing plate, 20 - main frame. Detailed Embodiments

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the scope of protection of the present invention.

[0034] The purpose of the present invention is to provide a multi-functional ore pass experimental platform capable of applying confining pressure and an experimental method to solve the problems existing in the above-mentioned prior art, to provide pre-added surrounding rock and ore-rock impact experimental conditions at the ore-rock impact position, and accordingly, experimental studies can be carried out on the failure forms and failure mechanisms of different ore pass shaft wall structures under the combined action of surrounding rock pressure and ore-rock impact.

[0035] In order to make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] As Figures 1 to 3As shown in the figure, this embodiment provides a multifunctional ore pass experimental platform capable of applying confining pressure, including a main frame 20 and an inclined chute 3 installed on the main frame 20. An adjustable ore pass model 16 is movably installed below the inclined chute 3. Preferably, the ore pass model 16 is made of transparent or semi-transparent materials to facilitate observing the internal ore and rock flow conditions from the outside. During actual production, by optimizing various parameters of the main structure, its structural strength is improved, its wear resistance is ensured, and a friction coefficient similar to that of an actual ore pass is obtained to ensure the reliability of experimental results. It is preferably made of glass or acrylic plate, etc. And the ore pass model 16 can be replaced and adjusted according to the experimental requirements of ore pass materials and dimensions. Through the ore pass model 16, ore discharging experiments are first carried out, and the whole process is recorded and photographed by a high-speed camera. Finally, the ore and rock migration trajectories in the main structure are obtained by comparing the photos, and the ore and rock impact positions in the ore pass model 16 are determined. The ore pass model 16 has a tubular structure and extends vertically. Its top is provided with an opening and is located below the discharge end of the inclined chute 3. The ore pass model 16 is equipped with a tubular shaft wall model 17. After the ore pass model 16 is cut, the shaft wall model 17 is coaxially installed between the two cut sections of the ore pass model 16. The shaft wall model 17 is equipped with a confining pressure loading mechanism for applying confining pressure to it. The confining pressure loading mechanism includes a plurality of force application units that all apply forces to the shaft wall model 17 in the horizontal direction, and each force application unit surrounds the outer peripheral side of the shaft wall model 17. The inclined chute 3 is equipped with a feeding mechanism for feeding it, and the feeding mechanism is connected to the feeding end of the inclined chute 3. In the prior art, for experimental studies on the failure evolution process, forms, and mechanisms of rocks under combined static and dynamic loading, common experimental equipment generally includes one-dimensional Hopkinson bars, two-dimensional Hopkinson bars, and three-dimensional Hopkinson bars, etc. However, such equipment can only conduct experimental studies on the failure of rocks under pre-applied static pressure and axial dynamic impact conditions. In actual ore pass engineering, in addition to being under static confining pressure loading conditions, the ore pass shaft wall structure is also subjected to impact loads, friction loads, and shear loads brought about by ore and rock impacts. At the same time, compared with the flat loading surface of the rock specimen in the Hopkinson experiment, the surface of the ore pass shaft wall has curvature, and the impact load applied in the Hopkinson experiment is quite different from the load applied by ore and rock impacts in actual ore pass engineering. Therefore, the present invention constructs a multifunctional ore pass experimental platform capable of applying confining pressure to provide a shaft wall service environment more in line with the actual situation of ore pass engineering and conduct experimental studies on the failure of ore pass shaft walls under confining pressure and dynamic impact conditions.After obtaining the ore-rock impact position in the ore pass model 16, the present invention cuts the ore pass model 16 and replaces its ore-rock impact section with the shaft wall model 17. Specifically, the shaft wall model 17 is coaxially connected between the two cut ore pass models 16, and confining pressure is applied to the shaft wall model 17 by each force application unit to provide pre-added surrounding rock and ore-rock impact experimental conditions at the ore-rock impact position. Accordingly, experimental studies can be carried out on the failure modes and failure mechanisms of different ore pass shaft wall structures under the combined action of surrounding rock pressure and ore-rock impact, increasing the basic functions of the traditional ore pass experimental platform and expanding the scope of use of the traditional ore pass experimental platform.

[0037] In a specific embodiment, the confining pressure loading mechanism further includes a reaction frame 12. The reaction frame 12 has an annular frame structure with a vertically extending axis. The shaft wall model 17 is installed on the inner peripheral side of the reaction frame 12. The two cut ore pass models 16 are respectively located at the upper and lower positions of the reaction frame 12. There is a gap for installing the force application unit between the shaft wall model 17 and the inner peripheral wall of the reaction frame 12. One end of the force application unit is installed on the inner peripheral wall of the reaction frame 12, and the other end abuts against the outer peripheral wall of the shaft wall model 17.

[0038] Preferably, the reaction frame 12 includes a pressing part with a right-angled structure. The radial cross-section of the shaft wall model 17 is a rectangular structure, and its two adjacent outer wall surfaces respectively abut against the two inner wall surfaces of the pressing part. The confining pressure loading mechanism includes two force application units. The two force application units both extend horizontally and are distributed at right angles, and respectively abut against the other two outer wall surfaces of the shaft wall model 17 that are away from the pressing part. The two inner wall surfaces of the pressing part form reaction forces on the shaft wall model 17 to form a bidirectional confining pressure on the shaft wall model 17. Further preferably, the reaction frame 12 as a whole has a rectangular frame structure to facilitate manufacturing, and the shaft wall model 17 can be installed at any inner right angle of the reaction frame 12.

[0039] Among them, the force application unit includes a hydraulic jack 18 and a loading pressing plate 19. One end of the hydraulic jack 18 is installed on the reaction frame 12, and the other end is installed with a loading pressing plate 19. The loading pressing plate 19 abuts against the two outer wall surfaces of the bearing section.

[0040] In a specific embodiment, the confining pressure loading mechanism further includes a plurality of vertically telescopic support rods 13. Each support rod 13 is evenly distributed at equal intervals along the circumference of the reaction frame 12. The bottom end of the support rod 13 is movably installed on the main frame 20, and the top end of the support rod 13 is connected to the reaction frame 12. The height of the reaction frame 12 is adjusted by the support rod 13, so as to adjust the confining pressure loading position on the shaft wall model 17 and realize the experimental study on the failure of the shaft wall structure of the ore pass under the combined action of the surrounding rock pressure and ore-rock impact in different depth ore pass sections.

[0041] Generally speaking, the confining pressure loading mechanism composed of the reaction frame 12, the support rod 13, the hydraulic jack 18, the loading plate and other structures can be movably installed on the main frame 20, and then, through the position movement and rotation adjustment of the entire confining pressure loading mechanism, the loading direction of the impact position in the ore-rock impact section of the raise model 16 can be changed. Moreover, the confining pressure loading mechanism composed of the reaction frame 12, the support rod 13, the hydraulic jack 18, the loading plate and other structures is independent and detachable relative to the traditional experimental platform, and the basic functions of the entire multifunctional raise experimental platform capable of applying confining pressure are not affected after disassembly. And it is for sectional loading and the loading position is adjustable, rather than loading the entire height of the raise model 16.

[0042] In a specific embodiment, the main frame 20 includes a bottom frame and a top frame movably installed on the bottom frame in the vertical direction; the confining pressure loading mechanism is movably installed on the bottom frame, and the inclined chute 3 is installed on the top frame. By adjusting the top frame, the relative height of the discharge end of the inclined chute 3 can be adjusted; specifically, the bottom frame includes a plurality of bottom columns evenly distributed at equal intervals in the circumferential direction, and each bottom column surrounds the outer peripheral side of the confining pressure loading mechanism. The top frame includes a plurality of top columns corresponding to each bottom column one by one, and each top column is slidably installed on each bottom column to realize the adjustment of the height of the entire top frame. Preferably, the bottom column is a straight pipe structure with an open top end, and the top column can be movably inserted into the bottom column. Further, there is no limitation on the way to drive the top frame. A suspension device can be used to move the top frame, or an electric lifting platform mechanism or a screw lifter can be used to precisely adjust the top frame.

[0043] In a specific embodiment, an angle adjustment bracket 5 and an angle adjustment rod 4 are provided on the top frame. The angle adjustment bracket 5 extends horizontally in a direction perpendicular to the width of the inclined chute 3. The angle adjustment rod 4 is movably supported at the bottom position of the feeding end of the inclined chute 3 and is movably installed on the angle adjustment bracket 5 along the extending direction of the angle adjustment bracket 5. The discharge end of the inclined chute 3 is rotatably installed on the main frame 20. By driving the angle adjustment rod 4 to move along the angle adjustment bracket 5, the angle adjustment rod 4 abuts against different positions at the bottom of the discharge end of the inclined chute 3, and since the discharge end of the inclined chute 3 is rotationally matched with the main frame 20, the overall inclination angle of the inclined chute 3 is changed; an angle positioning mechanism for positioning the angle adjustment rod 4 is provided on the angle adjustment bracket 5 to realize the positioning of the angle adjustment rod 4 through the angle positioning mechanism. Preferably, the angle positioning mechanism can adopt a set screw or a positioning bolt, etc., to be connected between the angle adjustment rod 4 and the angle adjustment bracket 5.

[0044] Further preferably, the angle adjustment bracket 5 includes two angle adjustment tracks both horizontally extending along a direction perpendicular to the width of the inclined chute 3, the two angle adjustment tracks are arranged at intervals, and both ends of the angle adjustment rod 4 are movably installed on the two angle adjustment tracks respectively.

[0045] In a specific embodiment, a position adjustment bracket 7 and a position adjustment rod 6 are provided on the top frame. The position adjustment bracket 7 is located below the angle adjustment bracket 5 and extends in parallel with the angle adjustment bracket 5. The position adjustment rod 6 is movably installed on the position adjustment bracket 7 along the extending direction of the position adjustment bracket 7 and is rotationally matched with the position adjustment bracket 7. The discharge end of the inclined chute 3 is installed on the position adjustment rod 6. On the premise that the angle adjustment rod 4 moves synchronously, by driving the position adjustment rod 6 to move along the position adjustment bracket 7, the whole inclined chute 3 can be driven to move horizontally, so as to change the position of the inclined chute 3; a position positioning mechanism for fixing the position adjustment rod 6 is provided on the position adjustment bracket 7, so as to realize the positioning of the position adjustment rod 6 through the position positioning mechanism. Preferably, the position positioning mechanism can adopt a set screw or a positioning bolt, etc., to be connected between the position adjustment bracket 7 and the position adjustment rod 6.

[0046] Further preferably, the position adjustment bracket 7 includes two position adjustment tracks both extending in parallel with the angle adjustment bracket 5, the two position adjustment tracks are arranged at intervals, and both ends of the position adjustment rod 6 are movably installed on the two position adjustment tracks respectively.

[0047] In a specific embodiment, a top bracket 2 is provided on the top frame. The feeding mechanism includes an ore unloading bin 1 located above the inclined chute 3. The ore unloading bin 1 is movably installed on the top bracket 2 along a direction perpendicular to the width of the inclined chute 3. By horizontally moving the ore unloading bin 1 along the top bracket 2, the horizontal relative distance between it and the shaft model 16 can be adjusted.

[0048] In a specific embodiment, a bottom bracket 15 is provided on the bottom frame below the confining pressure loading mechanism. A support frame is provided on the bottom bracket 15. A support plate 14 that can move horizontally is provided on the support frame. Since the confining pressure loading mechanism is arranged on the support plate 14, by moving the support plate 14, the confining pressure loading mechanism and the shaft model 16 can be driven to move, so as to realize the adjustment of the horizontal relative distance between the shaft model 16 and the inclined chute 3. A through hole for the shaft model 16 to extend out from below is provided on the support plate 14. The confining pressure loading mechanism is movably installed on the support plate 14. The support frame is in a ring frame structure surrounding the outer peripheral side of the through hole, so as to support the support plate 14 through the support frame, ensure the stability of the support for the confining pressure loading mechanism, and realize the horizontal movement of the support plate 14 along the support frame through the support frame.

[0049] Among them, the bottom end of the ore pass model 16 extends downward from the through hole on the support plate 14, and a ore discharging mechanism is provided at the bottom of the ore pass model 16. The ore discharging mechanism is responsible for controlling the discharge of ore from the bottom of the ore pass model 16 at the end of the experiment or at a specific time point. This is usually achieved through structures such as gates, chutes or rotary valves, and can be operated manually or automatically. The design of the ore discharging mechanism needs to ensure the uniformity and controllability of material discharge, so as to accurately measure and analyze the flow efficiency of materials.

[0050] In a specific embodiment, a positioning bracket is provided on the bottom frame between the inclined chute 3 and the confining pressure loading mechanism. The positioning bracket surrounds the outer periphery of the part of the ore pass model 16 above the reaction frame 12 and is movably abutted against the outer peripheral wall surface of the ore pass model 16 to be able to position and straighten the ore pass model 16. Among them, the positioning bracket includes an upper positioning bracket installed on the bottom frame and a lower positioning bracket located below it. The upper positioning bracket includes two upper positioning tracks 9 that both extend horizontally along the width direction of the inclined chute 3. The two upper positioning tracks 9 are arranged at intervals. Two upper positioning rods 8 are provided between the two upper positioning tracks 9. The two ends of the upper positioning rod 8 are respectively movably installed on the two upper positioning tracks 9. The two upper positioning rods 8 clamp on both sides of the ore pass model 16. The lower positioning bracket includes two lower positioning tracks 10 that both extend horizontally along the direction perpendicular to the width of the inclined chute 3. The two lower positioning tracks 10 are arranged at intervals. Two lower positioning rods 11 are provided between the two lower positioning tracks 10. The two ends of the lower positioning rod 11 are respectively movably installed under the two lower positioning tracks 10. The two lower positioning rods 11 clamp on both sides of the ore pass model 16.

[0051] Furthermore, an experimental method is also provided, including the following steps:

[0052] Adjust the ore unloading bin 1: The ore unloading bin 1 moves along the top bracket 2, or the ore pass model 16 moves on the bottom bracket 15;

[0053] Adjust the inclination angle and position of the inclined chute 3: The position adjusting rod 6 moves along the position adjusting bracket 7 for adjusting the position of the inclined chute 3; after the position of the inclined chute 3 is determined, the inclination angle of the inclined chute 3 is adjusted by moving the angle adjusting rod 4 along the angle adjusting bracket 5;

[0054] Adjust the size of the ore pass model 16: By moving the top frame along the bottom frame, the height of the top frame is changed to provide spatial conditions for raising and lowering the ore pass model 16; by adjusting the positioning bracket and replacing the support plate 14 with different through holes, the diameter of the ore pass model 16 is adjusted;

[0055] Install a high-speed camera: After the adjustment is completed, install the high-speed camera so that the shooting range of the high-speed camera covers the ore pass model 16, which is used to record videos and take photos of the ore pass model 16 throughout the process during the lowering of ore and rock. Then, obtain the migration trajectory of the ore and rock in the ore pass model 16 by comparing the photos, and clarify the impact position of the ore and rock in the ore pass model 16;

[0056] Install the shaft wall model 17: After determining the ore and rock impact range, manufacture the shaft wall model 17. The height of the shaft wall model 17 is the same as the height of the ore and rock impact range. Cut the position of the ore pass model 16 corresponding to the ore and rock impact, coaxially install the shaft wall model 17 at the cutting position of the ore pass model 16, sleeve the reaction frame 12 on the shaft wall model 17, and install the force application unit. Then, adjust the height of the reaction frame 12 through the support rod 13;

[0057] Start the experiment: Apply confining pressure to the shaft wall model 17 through the force application unit according to the experimental design parameters. After the loading is completed, lower the ore and rock through the ore unloading bin 1. After lowering the ore and rock the required number of times according to the experimental plan, remove the shaft wall model 17, and measure and analyze the damage condition of the shaft wall model 17 through equipment such as a borehole camera, so as to realize the experimental study on the damage of the ore pass shaft wall under the combined action of surrounding rock pressure and ore and rock impact.

[0058] Adaptability changes made according to actual needs are all within the protection scope of the present invention.

[0059] It should be noted that for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0060] Specific examples are used in the present invention to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A multifunctional chute test platform capable of applying confining pressure, characterized in that: It comprises a main frame and an inclined chute installed on the main frame; A cuttable chute model is movably installed below the inclined chute. The chute model is a tubular structure and extends vertically. An opening is provided at the top of the chute and is located below the discharge end of the inclined chute. The chute model is equipped with a well wall model in a tubular structure. After the chute model is cut, the well wall model is coaxially installed between the two sections of the cut chute model. The well wall model is equipped with a confining pressure loading mechanism for applying confining pressure thereto. The confining pressure loading mechanism includes a plurality of force applying units that apply force to the well wall model in a horizontal direction, and each of the force applying units surrounds the outer peripheral side of the well wall model. The inclined chute is equipped with a feeding mechanism for feeding materials thereto, and the feeding mechanism is connected with the feeding end of the inclined chute.

2. The multifunctional chute test platform capable of applying confining pressure according to claim 1 is characterized in that: The confining pressure loading mechanism also includes a reaction frame, which is a ring-shaped frame structure with an axis extending vertically, and the well wall model is installed on the inner circumference of the reaction frame, and the two cut well models are respectively located at the upper and lower sides of the reaction frame; There is a gap between the well wall model and the inner peripheral wall of the reaction frame for installing the force applying unit. One end of the force applying unit is installed on the inner peripheral wall of the reaction frame, and the other end abuts against the outer peripheral wall of the well wall model.

3. The multifunctional chute test platform capable of applying confining pressure according to claim 2 is characterized in that: The confining pressure loading mechanism also includes a plurality of support rods that are retractable in the vertical direction, each of which is evenly spaced along the circumference of the reaction frame, and the bottom ends of the support rods are movably mounted on the main frame, and the top ends of the support rods are connected to the reaction frame.

4. The multifunctional chute test platform capable of applying confining pressure according to claim 2 or 3, characterized in that: The main frame comprises a bottom frame and a top frame movably mounted on the bottom frame in a vertical direction; the confining pressure loading mechanism is movably mounted on the bottom frame, and the inclined chute is mounted on the top frame.

5. The multifunctional chute test platform capable of applying confining pressure according to claim 4 is characterized in that: An angle adjustment bracket and an angle adjustment rod are provided on the top frame, the angle adjustment bracket extends horizontally in a direction perpendicular to the width of the inclined chute, the angle adjustment rod is movably supported at the bottom position of the feed end of the inclined chute, and is movably mounted on the angle adjustment bracket along the extension direction of the angle adjustment bracket, and the discharge end of the inclined chute is rotatably mounted on the main frame; The angle adjustment bracket is provided with an angle positioning mechanism for positioning the angle adjustment rod.

6. The multifunctional chute test platform capable of applying confining pressure according to claim 5 is characterized in that: The top frame is provided with a position adjustment bracket and a position adjustment rod, the position adjustment bracket is located below the angle adjustment bracket and extends parallel to the angle adjustment bracket, the position adjustment rod is movably mounted on the position adjustment bracket along the extension direction of the position adjustment bracket and is rotatably matched with the position adjustment bracket, and the discharge end of the inclined chute is mounted on the position adjustment rod; The position adjustment bracket is provided with a position positioning mechanism for fixing the position adjustment rod.

7. The multifunctional chute test platform capable of applying confining pressure according to claim 4 is characterized in that: A top bracket is arranged on the top frame, and the feeding mechanism comprises an ore unloading bin located above the inclined chute, and the ore unloading bin is movably mounted on the top bracket along a direction perpendicular to the width of the inclined chute.

8. The multifunctional chute test platform capable of applying confining pressure according to claim 4, characterized in that: The bottom frame is provided with a bottom bracket located below the confining pressure loading mechanism, the bottom bracket is provided with a support frame, the support frame is provided with a support plate movable in a horizontal direction, the support plate is provided with a through hole for the chute model to extend from below, the confining pressure loading mechanism is movably mounted on the support plate, and the support frame is in the form of an annular frame structure surrounding the outer peripheral side of the through hole.

9. The multifunctional chute test platform capable of applying confining pressure according to claim 4, characterized in that: The bottom frame is provided with a positioning bracket located between the inclined chute and the confining pressure loading mechanism. The positioning bracket surrounds the outer peripheral side of the part of the chute model located on the upper side of the reaction frame and movably abuts against the outer peripheral wall surface of the chute model.

10. An experimental method using the multifunctional chute experimental platform capable of applying confining pressure as claimed in any one of claims 1 to 9, characterized in that: The steps include: Adjust the unloading bin: the unloading bin moves along the top support, or the chute model moves on the bottom support; Inclined chute angle and position adjustment: the position adjustment rod moves along the position adjustment bracket to adjust the position of the inclined chute; after the position of the inclined chute is determined, the angle of the inclined chute is adjusted by moving the angle adjustment rod along the angle adjustment bracket; Adjustment of the size of the chute model: by moving the top frame along the bottom frame, the height of the top frame is changed to provide space conditions for raising and lowering the chute model; by adjusting the positioning bracket and replacing the support plate with different through holes, the diameter of the chute model can be adjusted; Installing a high-speed camera: After the adjustment is completed, install a high-speed camera so that the shooting range of the high-speed camera covers the chute model. During the process of lowering the ore and rock, the high-speed camera is used to record and take pictures throughout the process, and then the ore and rock migration trajectory in the chute model is obtained by photo comparison to clarify the impact position of the ore and rock in the chute model; Install the shaft wall model: after determining the impact range of the ore and rock, manufacture the shaft wall model, the height of which is consistent with the height of the impact range of the ore and rock, cut the position of the chute model corresponding to the impact of the ore and rock, coaxially install the shaft wall model at the cutting position of the chute model, and sleeve the reaction frame on the shaft wall model, install the force unit, and then adjust the height of the reaction frame through the support rod; Start the experiment: apply confining pressure to the shaft wall model through the force-applying unit according to the experimental design parameters, lower the ore rock through the ore unloading bin after loading, remove the shaft wall model after lowering the ore rock for the required number of times according to the experimental plan, and measure and analyze the damage of the shaft wall model through drilling cameras and other equipment to realize the experimental study on the damage of the shaft wall under the combined action of surrounding rock pressure and ore rock impact.

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