Water jet erosion efficiency test experiment system

Abstract

The invention provides a water jet erosion efficiency test experiment system which comprises a water jet platform, a jet box is arranged on the water jet platform, a test piece positioning mechanism is arranged in the jet box, the top of the jet box is open, a portal frame is arranged on the jet platform, and a water jet spraying piece is slidably hung on the portal frame; a high-speed camera is arranged on the inner side wall of the gantry; the water jet jetting piece is communicated with a water jet generating assembly; a bottom pipeline of the jet box is communicated with an automatic weighing system; the water jet spraying piece, the high-speed camera, the test piece positioning mechanism and the automatic weighing system are electrically connected with the same control center. By arranging the automatic weighing system and the high-speed camera, high-precision camera shooting and dynamic quantification of the erosion efficiency can be carried out on the jetting process of the water jet jetting part, and real-time monitoring of the weight loss rate, the breaking volume and the fracture development characteristics in the erosion process can be achieved; and the system analysis on the erosion characteristics of the jet flow under different working conditions is facilitated.

Description

Technical Field

[0001] This invention relates to the field of coal seam permeability enhancement technology, and in particular to an experimental system for testing the efficiency of water jet erosion. Background Technology

[0002] As coal mining progresses to deeper levels, the prevention and treatment of gas disasters in high-gas, low-permeability coal seams become increasingly difficult, making water jet erosion technology a crucial method for enhancing coal and rock permeability. Since its development in the 1970s, water jet technology has evolved from its initial use in cutting glass and plastics to the emergence of continuous jets, pulsed jets, and cavitation jets for coal and rock fracturing to improve erosion efficiency. However, the complex influence of different working conditions on its erosion effect and the lack of systematic experimental support have hindered its application. To address this, a water jet erosion efficiency testing system was developed. This system can simulate various working conditions, including switching between continuous jets, pulsed jets, and cavitation jets, and precisely adjusting jet pressure, flow rate, nozzle structure, target distance, and the clamping of coal and rock specimens with different characteristics.

[0003] The efficiency of water jet erosion is affected by a variety of factors, such as the type of nozzle, water pressure, erosion target distance, and specimen confining pressure. Most of the existing patent descriptions are conducted in the form of numerical simulation, with few related experimental devices, and it is impossible to establish an effective relationship between erosion time and fragmentation efficiency, crack characteristics, impact pressure, etc. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art.

[0005] To achieve the above objectives, this invention proposes a water jet erosion efficiency testing system, comprising a water jet platform, a jet box on the water jet platform, a specimen positioning mechanism inside the jet box, an open top for the jet box, and a gantry frame on the jet platform, on which a water jet jetting component can be slidably suspended, the water jet jetting component being able to extend into the jet box; A high-speed camera is installed on the inner wall of the gantry frame; The water jet injector is connected to a water jet generating component; The bottom pipe of the jet box is connected to an automatic weighing system; The water jet ejector, the high-speed camera, the specimen positioning mechanism, and the automatic weighing system are all electrically connected to the same control center.

[0006] This invention, by setting up an automatic weighing system and a high-speed camera, can perform high-precision video recording and dynamic quantification of erosion efficiency of the water jet ejector. It can realize real-time monitoring of weight loss rate, fragmentation volume and crack development characteristics during erosion, which is beneficial for systematic analysis of the erosion characteristics of the jet under different working conditions.

[0007] Optionally, the water jet generating component includes a water supply tank, a first pipe is connected between the water supply tank and the water jet injector, and a water supply pump is installed on the water supply tank.

[0008] Furthermore, a gas-liquid mixing device is installed on the water supply pipeline, and the gas-liquid mixing device is connected to a second pipeline. The second pipeline is sequentially connected to a high-pressure gas pump station and a high-pressure gas cylinder along the direction of the gas-liquid mixing device.

[0009] Furthermore, a pressure sensor is installed in the first pipeline downstream of the gas-liquid mixing device.

[0010] Furthermore, a pressure controller is installed on the first pipeline at a position between the water supply tank and the gas-liquid mixing device.

[0011] Furthermore, the specimen positioning mechanism includes a bearing platform, a specimen fixing groove is provided inside the bearing platform, and multiple hydraulic cylinders are provided around the bearing platform, with the output end of the hydraulic cylinders penetrating through the bearing platform into the specimen fixing groove; Furthermore, all of the hydraulic cylinders are at the same horizontal height, and the relative positions of each hydraulic cylinder on the corresponding fixed side wall are the same.

[0012] Furthermore, the water jet ejector includes a lifting block that is slidably connected to the crossbeam of the gantry frame, and the lifting block is provided with a universal nozzle on the side facing the jet box; Furthermore, a telescopic component is provided between the lifting block and the universal nozzle.

[0013] Furthermore, the gantry frame and the water jet platform are slidably connected, and the sliding direction between the gantry frame and the water jet is perpendicular to the sliding direction between the lifting block and the gantry frame.

[0014] Furthermore, the sidewall of the jet box is configured as a transparent plate.

[0015] Furthermore, the automatic weighing system includes a vibrating screen and a weighing device connected by a pipe, wherein the vibrating screen is connected to the jet box via a pipe. Both the vibrating screen and the weighing device are electrically connected to the control center.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the overall structure of a water jet erosion efficiency testing experimental system according to the present invention; Figure 2 This is a schematic diagram of the internal structure of the jet box of a water jet erosion efficiency testing experimental system according to the present invention.

[0018] Explanation of reference numerals in the attached figures: 1. Water jet platform; 2. Jet box; 3. Specimen positioning mechanism; 31. Bearing platform; 32. Specimen fixing groove; 33. Hydraulic cylinder; 4. Gantry frame; 5. Water jet spray component; 51. Lifting block; 52. Universal nozzle; 53. Telescopic component; 6. High-speed camera; 7. Water jet generating assembly; 71. Water supply tank; 72. Water supply pump; 73. Gas-liquid mixing device; 74. First pipeline; 75. Second pipeline; 76. High-pressure gas cylinder; 77. High-pressure gas pump station; 78. Pressure sensor; 79. Pressure controller; 8. Automatic weighing system; 81. Vibrating screen; 82. Weighing component; 9. Water collection tank; 91. Grating. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0020] This invention proposes an experimental system for testing the erosion efficiency of water jets, as described below. Figures 1 to 2 Please provide a detailed explanation.

[0021] A water jet erosion efficiency testing system includes a water jet platform 1, a jet box 2 on the water jet platform 1, a specimen positioning mechanism 3 inside the jet box 2, an open top for the jet box 2, and a gantry 4 on the jet platform. A water jet nozzle 5 is slidably suspended on the gantry 4 and can extend into the jet box 2. A high-speed camera 6 is installed on the inner wall of the gantry frame 4; The water jet ejector 5 is connected to the water jet generating component 7; The bottom pipe of the jet box 2 is connected to an automatic weighing system 8; The water jet spray component 5, the high-speed camera 6, the specimen positioning mechanism 3, and the automatic weighing system 8 are all electrically connected to the same control center.

[0022] By setting up an automatic weighing system 8 and a high-speed camera 6, this invention can perform high-precision video recording and dynamic quantification of erosion efficiency of the water jet ejector 5. It can realize real-time monitoring of weight loss rate, fragmentation volume and crack development characteristics during erosion, which is beneficial for systematic analysis of the erosion characteristics of the jet under different working conditions.

[0023] Specifically, when conducting a water jet experiment, the time is fixed inside the jet box 2 by the specimen positioning mechanism 3. After the specimen in the jet box 2 is positioned and installed using the specimen positioning mechanism 3, a wire strain displacement sensor or a distributed pressure sensor 78 is laid on the specimen according to the test requirements. The wire strain displacement sensor is used to detect the deformation of the specimen, and the distributed pressure sensor 78 can be used to detect the pressure of the water jet and the impact state of the specimen. Among them, the high-speed camera 6 and the distributed pressure sensor 78 are both electrically connected to the control center. The information from both is analyzed in conjunction with the control center to simultaneously capture the specimen's fracture area, gas-liquid two-phase flow pattern, and impact pressure morphology, providing multi-dimensional visual data for analyzing the erosion mechanism. Then, the water jet ejector 5 is controlled to slide directly above the specimen, and then the water jet generating component 7 is activated to supply high-pressure water to the water jet ejector component. The particles and debris generated during the erosion of the specimen by the water jet will fall into the bottom of the jet box 2 with the water flow and flow along the pipeline to the automatic weighing system 8. The automatic weighing system 8 weighs the debris generated during the erosion process in real time, thereby dynamically quantifying the erosion efficiency. In addition, the high-speed camera 6 takes pictures and observes the flow pattern of the erosion water flow and the broken area of ​​the specimen, so that the weight loss rate, broken volume and crack development characteristics during the erosion process can be accurately observed and quantified.

[0024] In some embodiments, the water jet generating assembly 7 includes a water supply tank 71, a first pipe 74 connecting the water supply tank 71 and the water jet injector 5, and a water supply pump 72 is provided on the water supply tank 71. In some embodiments, the water supply pump 72 is configured as a plunger pump to provide a high-pressure, high-flow-rate water supply environment, and the water supply tank 71 is provided with an inlet for supplying new water sources, so that when the water source in the water supply tank 71 is insufficient, water can be quickly supplied to the water supply tank 71 through the inlet.

[0025] In some embodiments, to further increase the pressure of the water jet, high-pressure gas is mixed into the high-pressure water flow. Specifically, a gas-liquid mixing device 73 is installed on the water supply pipeline. The gas-liquid mixing device 73 is connected to a second pipeline 75. The second pipeline 75 is sequentially connected to a high-pressure gas pump station 77 and a high-pressure gas cylinder 76 along the direction of the gas-liquid mixing device 73. By mixing the high-pressure gas provided by the high-pressure gas cylinder 76 into the high-pressure water flow, a high-pressure gas-liquid two-phase flow is formed, thereby further increasing the impact pressure. Furthermore, the pressure of the mixed high-pressure gas can be controlled by the high-pressure gas pump station 77, and the injection pressure of the gas-liquid two-phase flow can be controlled by controlling the gas phase pressure. Meanwhile, a pressure controller 79 is installed on the first pipeline 74 at the position between the water supply tank 71 and the gas-liquid mixing device 73 to regulate the pressure of the water supply pump 72, thereby further controlling the injection pressure of the gas-liquid two-phase flow from the perspective of controlling the liquid phase pressure.

[0026] In some embodiments, a pressure sensor 78 is installed downstream of the gas-liquid mixing device 73 in the first pipeline 74. This sensor is used to monitor the pressure of the gas-liquid two-phase flow in real time. The pressure sensor 78 is electrically connected to the control center. When the pressure sensor 78 detects that the pressure of the gas-liquid two-phase flow is too high or too low, the control center adjusts the pressure of the high-pressure gas pump station 77 or the pressure controller 79, thereby regulating the pressure of the gas-liquid two-phase flow by adjusting the liquid phase pressure or the gas phase pressure.

[0027] In some embodiments, the specimen positioning mechanism 3 includes a support platform 31, a specimen fixing groove 32 is provided in the support platform 31, and a plurality of hydraulic cylinders 33 are provided around the support platform 31. The output end of the hydraulic cylinder 33 passes through the support platform 31 and into the specimen fixing groove 32, which can fix the specimen on the one hand and provide confining pressure for the specimen on the other hand. Furthermore, all hydraulic cylinders 33 are at the same horizontal height, and the relative positions of each hydraulic cylinder 33 on the corresponding fixed side wall are the same.

[0028] The arrangement of multiple hydraulic cylinders 33 allows for the fixation of the specimen from multiple directions, ensuring that the specimen remains in the working position throughout the impact process. Furthermore, the arrangement of multiple hydraulic cylinders 33 enables extension and retraction control in multiple directions, facilitating the adjustment of the specimen's position by the operator according to the test requirements. Alternatively, the operator can adjust the extension and retraction stroke of each hydraulic cylinder 33 according to the size and shape of the specimen to adaptively fix it in the working position.

[0029] In some embodiments, the water jet injector 5 includes a lifting block 51 that is slidably connected to the crossbeam of the gantry 4. A universal nozzle 52 is disposed on the side of the lifting block 51 facing the jet box 2. The universal nozzle 52 provides multiple angles for water jet injection in experiments, allowing operators to easily adjust the water jet injection angle according to experimental needs. The sliding arrangement of the lifting block 51 and the crossbeam of the gantry 4 provides lateral movement for the universal nozzle 52, facilitating adjustment of its lateral coordinate position by operators according to experimental requirements.

[0030] In some embodiments, a telescopic member 53 is provided between the lifting block 51 and the universal nozzle 52 for adjusting the erosion target distance between the nozzle and the specimen. The telescopic member 53 can be a hydraulic cylinder 33, an electric telescopic rod, or other mechanisms or devices with controllable stroke.

[0031] In some embodiments, the gantry 4 and the water jet platform 1 are slidably connected, and the sliding direction between the gantry 4 and the water jet is perpendicular to the sliding direction between the lifting block 51 and the gantry 4. This slidable connection between the gantry 4 and the water jet platform 1 provides the necessary movement for adjusting the longitudinal coordinate position of the universal nozzle 52, further facilitating the adjustment of the specific experimental position of the universal nozzle 52 by the operator. In one embodiment, the movement of the gantry 4 and the lifting block 51 are both controlled by a hydraulic cylinder 33 or a motor. The hydraulic system of the hydraulic cylinder 33 and the motor can be electrically connected to the control center, thereby enabling precise control of the gantry 4 and the lifting block 51's movement through the control center. In other words, the control center can precisely control the horizontal and vertical coordinate positions of the universal nozzle 52.

[0032] In some embodiments, the sidewall of the jet chamber 2 is configured as a transparent plate. The transparent plate prevents water from splashing out of the device during the experiment and allows observation of the entire experimental process.

[0033] In some embodiments, the automatic weighing system 8 includes a vibrating screen 81 and a weighing element 82 connected by a pipeline. The vibrating screen 81 is connected to the jet box 2 by a pipeline. Both the vibrating screen 81 and the weighing element 82 are electrically connected to a control center. The control center can remotely control the operation of the vibrating screen 81 and the weighing element 82, and can obtain the weight of the residue measured by the weighing element 82 in real time. In one embodiment, the weighing device 82 can be set as a balance, which is electrically connected to the control center. The balance feeds back the residue weight information to the control center in real time. The control center records the residue weight on the balance every minute to monitor the weight loss rate of the test specimen, realize the dynamic quantification of erosion efficiency, and reduce data errors.

[0034] In some embodiments, a water collection tank 9 is provided below the jet box 2, and the water collection tank 9 is connected to the jet box 2. A grid 91 is horizontally fixed at the bottom of the jet box 2 near the water collection tank 9. The specimen positioning mechanism 3 can be fixed on the grid 91. The vibrating screen 81 is connected to the water collection tank 9. When the eroded water enters the water collection tank 9, it flows through the pipe to the vibrating screen 81 for screening.

[0035] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0037] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0038] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0039] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0040] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A water jet erosion efficiency testing experimental system, characterized in that, The device includes a water jet platform, a jet box on the water jet platform, a specimen positioning mechanism inside the jet box, an open top on the jet box, and a gantry on the jet platform. A water jet nozzle is slidably suspended on the gantry and can extend into the jet box. A high-speed camera is installed on the inner wall of the gantry frame; The water jet injector is connected to a water jet generating component; The bottom pipe of the jet box is connected to an automatic weighing system; The water jet ejector, the high-speed camera, the specimen positioning mechanism, and the automatic weighing system are all electrically connected to the same control center.

2. The water jet erosion efficiency testing experimental system as described in claim 1, characterized in that, The water jet generating component includes a water supply tank, a first pipe connecting the water supply tank and the water jet injector, and a water supply pump is installed on the water supply tank.

3. The water jet erosion efficiency testing experimental system as described in claim 2, characterized in that, The water supply pipeline is equipped with a gas-liquid mixing device, which is connected to a second pipeline. The second pipeline is connected in sequence to a high-pressure gas pump station and a high-pressure gas cylinder along the direction of the gas-liquid mixing device.

4. The water jet erosion efficiency testing experimental system as described in claim 3, characterized in that, A pressure sensor is installed in the first pipeline downstream of the gas-liquid mixing device.

5. The water jet erosion efficiency testing experimental system as described in claim 3, characterized in that, A pressure controller is installed on the first pipeline at a position between the water supply tank and the gas-liquid mixing device.

6. The water jet erosion efficiency testing experimental system as described in claim 1, characterized in that, The specimen positioning mechanism includes a bearing platform, a specimen fixing groove is provided inside the bearing platform, and multiple hydraulic cylinders are provided around the bearing platform. The output end of the hydraulic cylinders passes through the bearing platform and into the specimen fixing groove. Furthermore, all of the hydraulic cylinders are at the same horizontal height, and the relative positions of each hydraulic cylinder on the corresponding fixed side wall are the same.

7. The water jet erosion efficiency testing experimental system as described in claim 1, characterized in that, The water jet ejector includes a lifting block that is slidably connected to the crossbeam of the gantry frame, and the lifting block is provided with a universal nozzle on the side facing the jet box; Furthermore, a telescopic component is provided between the lifting block and the universal nozzle.

8. The water jet erosion efficiency testing experimental system as described in claim 7, characterized in that, The gantry frame and the water jet platform are slidably connected, and the sliding direction between the gantry frame and the water jet is perpendicular to the sliding direction between the lifting block and the gantry frame.

9. The water jet erosion efficiency testing experimental system as described in claim 1, characterized in that, The sidewall of the jet box is made of a transparent plate.

10. The water jet erosion efficiency testing experimental system as described in claim 1, characterized in that, The automatic weighing system includes a vibrating screen and a weighing device connected by a pipeline. The vibrating screen is connected to the jet box via a pipeline. Both the vibrating screen and the weighing device are electrically connected to the control center.

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