Device and method for reproducing form of high-pressure water jet pore-forming cavity

Abstract

The invention provides a high-pressure water jet pore-forming cavity shape reproduction device and method. According to the invention, a silica gel copying technology is innovatively adopted, and the three-dimensional form and evolution process of holes formed by water jet impact can be accurately reproduced by virtue of good fluidity and plasticity of silica gel. The device can adapt to complex geological conditions such as coal seam fracture development and uneven hardness and extreme environments of high-pressure water jet impact, is convenient to operate, and makes up for the defect that coal rock mass hole form evolution under jet impact is difficult to accurately observe in an experiment. By visually presenting the dynamic change process of the hole under different jet parameters, a foundation is laid for accurately quantifying the coal breaking parameters and deeply exploring the hole change characteristics and rules of the water jet broken coal and rock mass, and then a key basis is provided for accurately judging the high-pressure water jet pressure relief and permeability increasing effect and influence factors thereof.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of safe and efficient development of mining industry, and particularly relates to a device and method for reproducing the shape of a cavity formed by high-pressure water jet. BACKGROUND

[0002] China has abundant deep coal seam resources, but the occurrence environment thereof has prominent problems such as high ground stress, high gas pressure, high crushing difficulty and low porosity and permeability, which seriously restricts the safe exploitation of deep coal seam gas disaster control and resources. The high-pressure water jet pressure relief and permeability enhancement technology has become one of the main means for deep coal seam gas control and safe exploitation due to its strong coal breaking efficiency and significant pressure relief effect. However, the current experimental research can only obtain macro-aperture data, and cannot accurately quantify the real crushing volume and damage network characteristics of the coal body, resulting in low coal breaking efficiency. SUMMARY

[0003] To solve the above problems, the present application provides a device and method for reproducing the shape of a cavity formed by high-pressure water jet. The present application innovatively uses silicone mold technology, and uses the good fluidity and plasticity of silicone to accurately reproduce the three-dimensional shape and evolution process of the hole formed by water jet impact. The device can adapt to complex geological conditions such as coal seam fracture development and uneven hardness, and the extreme environment of high-pressure water jet impact, and is convenient to operate, which makes up for the deficiency that the experimental observation of the hole shape evolution of coal and rock under water jet impact is difficult to be accurately observed. By directly presenting the dynamic change process of the hole under different jet parameters, the present application lays a foundation for accurately quantifying the coal breaking parameters and deeply exploring the hole change characteristics and rules of the water jet broken coal and rock, and further provides a key basis for accurately determining the pressure relief and permeability enhancement effect of high-pressure water jet and its influencing factors.

[0004] A device for reproducing the shape of a cavity formed by high-pressure water jet, comprising: an A glue storage tank (1), a B glue storage tank (2), a mixing and stirring tank (3), a vacuum degassing machine (6), a temperature control plate (7), a vacuum pump (9), a plunger pump (10), and a silicone delivery pipe (11); The A glue storage tank (1) and the B glue storage tank (2) are respectively connected with different inlets of the mixing and stirring tank (3) through respective pipelines; the outlet of the mixing and stirring tank is connected with the inlet of the vacuum degassing machine through a pipeline; The vacuum degassing machine (6) is provided with a vacuum pump (9) on one side, and is further provided with a temperature control plate (7) and a pressure gauge (8) for real-time monitoring of the temperature and pressure inside; when the temperature does not meet the requirements, the temperature setting interface is entered through the operation panel; when the temperature is low, the heating power can be increased through the heating element; when the temperature is high, the cooling system is started; when the pressure does not meet the requirements, the pressure is adjusted through the vacuum pump (9); when the vacuum degree is insufficient, the power of the vacuum pump is increased; when the vacuum degree is too high, the manual air release valve is slowly opened to adjust to the normal state; The outlet of the vacuum degassing machine (6) is connected to the inlet of the plunger pump (10) through a pipeline, and the outlet of the plunger pump is connected to the silicone conveying pipe (11), and one end of the silicone conveying pipe is detachably connected to the conical pouring head (12); Further, the mixing and stirring tank is provided with a stirring device (4) inside, which can mix and stir the flowing silica gel, and the tank body is a double-layer insulation structure, which can maintain the temperature in the tank at 20-32℃, avoiding the influence of environmental temperature change on the performance of silica gel raw materials.

[0005] Further, the A glue storage tank (1) and the B glue storage tank (2) are provided with valves (5) at the outlets, respectively, for adjusting the glue output of the A glue storage tank (1) and the B glue storage tank (2).

[0006] Further, the A glue storage tank (1) and the B glue storage tank (2) are made of glass with high transparency, corrosion resistance and high temperature resistance, so that the liquid level in the tank can be directly observed, and the tank can withstand the pressure of the glue liquid and is not easy to be damaged.

[0007] Further, the outlet of the mixing and stirring tank is provided with a valve (5) for adjusting the amount of glue entering the vacuum degassing machine (6).

[0008] Further, the silicone conveying pipe (11) is made of silicone material, which can withstand long-term contact with silica gel raw materials and is not easy to react chemically, and the inner wall of the silicone conveying pipe is smooth to reduce the resistance of silica gel in the conveying process and reduce the residue of glue.

[0009] Further, the conical pouring head is a detachable conical structure, which is convenient to disassemble and assemble and efficient to clean, and the conical pouring head adopts a tapered cavity to concentrate the material flow and smoothly exhaust air, effectively reducing bubble defects and improving the mold precision and repeatability.

[0010] Further, the device for reproducing the shape of the high-pressure water jet hole cavity further comprises a vibrator (13), and the vibrator (13) is adjusted in vibration frequency by an external controller to assist in vibrating the silica gel around the hole wall during silica gel pouring.

[0011] A method for reproducing the shape of a high-pressure water jet hole cavity, comprising the following steps: Select a conical pouring head suitable for the required diameter of the experiment, and install it at the end of the silicone conveying pipe; Adjust the pouring head position and place the conical pouring head directly above the sample hole; Check the pipeline connection state and the overall installation of the equipment; After checking that the equipment is correct, make the silica gel in the A glue storage tank and the B glue storage tank flow into the mixing and stirring tank, start the stirring device, mix and stir the A glue and the B glue, and fully stir until the mixed liquid is not layered; After the stirring is completed, the valve on the connecting pipeline between the mixing stirring tank and the vacuum degassing machine is opened, the mixed liquid is flowed into the vacuum degassing machine, then the vacuum pump is started to perform vacuum degassing treatment on the silica gel until no air bubble is precipitated, so as to eliminate the small pores in the mixed liquid; The valve on the connecting pipeline between the vacuum degassing machine and the plunger pump is opened, the plunger pump is started, the degassed mixed liquid is slowly poured into the hole cavity through the silica gel conveying pipe, and low-frequency vibration is synchronously performed through the vibrator during the pouring process. After the silica gel is completely solidified, the formed gel is slowly pulled away from the jet hole. The depth, outer diameter and volume of the gel after the re-molding are measured and recorded. The device and method can realize the rapid quantitative reproduction of the key features such as the hole profile and the hole volume by using the silica gel re-molding technology to complete the hole three-dimensional morphology within a few minutes after the high-pressure water jet punching, and provide an efficient and practical solution for clarifying the water jet punching shape evolution.

[0012] The device and method can completely re-mold the hole formed in the coal body by the high-pressure water jet by eliminating the air bubbles in the silica gel through the vacuum degassing machine, filling the hole details with the aid of the vibrator, and combining the precise extension of the conical pouring head, and the hole three-dimensional morphology can be highly restored by relying on the synergistic effect of the device itself.

[0013] The device and method can quickly adapt to the silica gel re-molding experiment under different jet parameters by the orderly connection of the components through the conveying pipeline, the replaceable conical pouring head, support batch preparation of the hole entity sample, and provide an entity basis for intuitive comparison of the hole characteristics under different parameters. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a general schematic view of a device for high-pressure water jet hole forming cavity shape reproduction; Figure 2 It is a schematic view of a vibrator.

[0015] In the figure, 1 is a glue storage tank, 2 is a glue storage tank, 3 is a mixing stirring tank, 4 is a stirring device, 5 is a valve, 6 is a vacuum degassing machine, 7 is a temperature control plate, 8 is a pressure gauge, 9 is a vacuum pump, 10 is a plunger pump, 12 is a silica gel conveying pipe, 12 is a conical pouring head, and 13 is a vibrator. DETAILED DESCRIPTION

[0016] With reference to the accompanying drawings, the technical solutions in the embodiments of the present application will be clearly and completely described below, obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0017] The present application proposes a device and method for reproducing the morphology of a high-pressure water jet hole-forming cavity. The device innovatively uses silicone mold technology to accurately reproduce the three-dimensional morphology and evolution process of the hole formed by water jet impact, taking advantage of the good fluidity and plasticity of silicone. The device can adapt to complex geological conditions such as coal seam fracture development and uneven hardness, as well as the extreme environment of high-pressure water jet impact, and is easy to operate, making up for the deficiency that experiments cannot accurately observe the evolution of the hole morphology of coal and rock under water jet impact. By visually presenting the dynamic change process of the hole under different water jet parameters, the device lays a foundation for accurately quantifying coal breaking parameters and further exploring the hole change characteristics and rules of water jet breaking coal and rock, and provides key evidence for accurately determining the effect of high-pressure water jet pressure relief and permeability improvement and its influencing factors.

[0018] As shown in Figure 1 A device for reproducing the morphology of a high-pressure water jet hole-forming cavity, comprising: an A glue storage tank (1), a B glue storage tank (2), a mixing and stirring tank (3), a vacuum degassing machine (6), a temperature control board (7), a vacuum pump (9), a plunger pump (10), and a silicone delivery pipe (11); The A glue storage tank (1) and the B glue storage tank (2) are respectively connected to different inlets of the mixing and stirring tank (3) through their respective pipelines; the outlet of the mixing and stirring tank is connected to the inlet of the vacuum degassing machine through a pipeline; The vacuum degassing machine (6) is provided with a vacuum pump (9) on one side, and is also provided with a temperature control board (7) and a pressure gauge (8) for real-time monitoring of the internal temperature and pressure; when the temperature does not meet the requirements, the temperature setting interface can be entered through the operation panel; when the temperature is low, the heating power can be increased by heating elements; when the temperature is high, the cooling system is started; when the pressure does not meet the requirements, the pressure is adjusted by the vacuum pump (9); when the vacuum degree is insufficient, the pump power is increased; when the vacuum degree is too high, the manual air release valve is slowly opened to adjust to the normal state; The outlet of the vacuum degassing machine (6) is connected to the inlet of the plunger pump (10) through a pipeline, the outlet of the plunger pump is connected to the silicone delivery pipe (11), and one end of the silicone delivery pipe is detachably connected to a conical pouring head (12); Furthermore, the mixing tank is equipped with a stirring device (4) to mix the flowing silica gel. The tank body has a double-layer insulation structure, which can maintain the temperature inside the tank at 20-32℃, thus avoiding the impact of ambient temperature changes on the performance of the silica gel raw material.

[0019] Furthermore, valves (5) are installed at the outlets of both the A-grade glue storage tank (1) and the B-grade glue storage tank (2) to adjust the glue output of the A-grade glue storage tank (1) and the B-grade glue storage tank (2) respectively.

[0020] Furthermore, the A-grade adhesive storage tank (1) and the B-grade adhesive storage tank (2) are made of highly transparent, corrosion-resistant, and high-temperature resistant glass, which allows for direct observation of the liquid level inside the tank, withstands the pressure of the adhesive liquid inside the tank, and is not easily damaged.

[0021] Furthermore, a valve (5) is provided at the outlet of the mixing tank to regulate the amount of adhesive entering the vacuum degasser (6).

[0022] Furthermore, the silicone conveying tube (11) is made of silicone material, which can withstand long-term contact with silicone raw materials and is not prone to chemical reaction. The inner wall of the silicone conveying tube is smooth to reduce the resistance of silicone during the conveying process and reduce the amount of glue residue.

[0023] Furthermore, the conical pouring head is a detachable conical structure, which is convenient to disassemble and assemble and efficient to clean. The conical pouring head adopts a tapered cavity, which concentrates the material flow and facilitates smooth venting, effectively reducing bubble defects and improving the accuracy and repeatability of mold replication.

[0024] Furthermore, the device for reproducing the morphology of the cavity formed by high-pressure water jet also includes a vibrator (13), which is adjusted by an external controller to vibrate the silicone around the cavity wall during the silicone pouring process.

[0025] like Figure 1 The device shown is for reproducing the morphology of a cavity formed by high-pressure water jet. The method for reproducing the morphology of a cavity formed by high-pressure water jet using this device includes the following steps: Select a conical pouring head with a suitable diameter for the experiment and install it at the end of the silicone delivery tube; Adjust the position of the pouring head, placing the conical pouring head directly above the sample hole; Check the pipe connections and the overall installation of the equipment; After the equipment is checked and found to be correct, the silica gel in the A and B storage tanks flows into the mixing tank. Start the stirring device to mix the A and B adhesives until the mixture is fully stirred and there is no stratification. After the stirring is completed, the valve on the connecting pipeline between the mixing stirring tank and the vacuum degassing machine is opened, the mixed liquid is flowed into the vacuum degassing machine, then the vacuum pump is started to perform vacuum degassing treatment on the silica gel until no air bubble is precipitated, so as to eliminate the small pores in the mixed liquid; The valve on the connecting pipeline between the vacuum degassing machine and the plunger pump is opened, the plunger pump is started, the degassed mixed liquid is slowly poured into the hole cavity through the silica gel conveying pipe, and low-frequency vibration is synchronously performed through the vibrator during the pouring process. After the silica gel is completely solidified, the formed gel is slowly pulled away from the jet hole; The depth, outer diameter and volume of the gel after the re-molding are measured and recorded. The device and method can realize nondestructive and high-precision re-molding of the three-dimensional morphology of the hole within a few minutes after the high-pressure water jet punching is completed, realize rapid quantitative reproduction of the key features such as the hole profile and the hole volume, and provide an efficient and practical solution for clarifying the morphological evolution of the water jet punching.

[0026] The device and method can completely re-mold the hole formed in the coal body by the high-pressure water jet through the elimination of air bubbles in the silica gel by the vacuum degassing machine, the auxiliary filling of the hole details by the vibrator, and the precise extension of the conical pouring head, and realize the high reduction of the three-dimensional morphology of the hole by relying on the synergistic effect of the device itself.

[0027] The device and method can quickly adapt to silica gel re-molding experiments under different jet parameters by the ordered connection of the components through the conveying pipeline and the replaceable conical pouring head, support batch preparation of the hole entity sample, and provide an entity basis for intuitively comparing the hole features under different parameters.

[0028] It is apparent to those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, but can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, and the scope of the present application should be defined by the appended claims rather than the above description, and it is intended to encompass all changes falling within the meaning and range of equivalents of the claims. Any reference signs in the claims should not be deemed to limit the claims involved.

[0029] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description manner of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that can be understood by those skilled in the art.

Claims

1. A device for reproducing the morphology of a high-pressure waterjet bore, characterized by It comprises A glue storage tank (1), B glue storage tank (2), mixing and stirring tank (3), vacuum degassing machine (6), temperature control plate (7), vacuum pump (9), plunger pump (10), conveying silica gel pipe (11); A glue storage tank (1) and B glue storage tank (2) are respectively connected with different inlets of mixing and stirring tank (3) through respective pipelines; the outlet of mixing and stirring tank is connected with the inlet of vacuum degassing machine through a pipeline; The vacuum degassing machine (6) is provided with a vacuum pump (9) on one side, and is also provided with a temperature control plate (7) and a pressure gauge (8) for real-time monitoring of the temperature and pressure inside; when the temperature does not meet the requirements, the temperature setting interface can be entered through the operation panel; when the temperature is low, the heating power can be increased by heating elements; when the temperature is high, the cooling system is started; when the pressure does not meet the requirements, the pressure is adjusted by the vacuum pump (9); when the vacuum degree is insufficient, the power of the vacuum pump is increased; when the vacuum degree is too high, the manual air release valve is slowly opened to adjust to the normal state; The outlet of vacuum degassing machine (6) is connected with the inlet of plunger pump (10) through a pipeline, the outlet of plunger pump is connected with conveying silica gel pipe (11), and one end of conveying silica gel pipe is detachably connected with a conical pouring head (12).

2. A device for reproducing the shape of a high-pressure waterjet bore according to claim 1, characterized in that The mixing and stirring tank is provided with a stirring device (4) inside, which can mix and stir the flowing silica gel; the tank body is a double-layer insulation structure, which can maintain the temperature in the tank at 20-32℃, avoiding the influence of environmental temperature change on the performance of silica gel raw materials.

3. A device for reproducing the shape of a high-pressure waterjet bore according to claim 1, characterized in that Valves (5) are arranged at the outlets of A glue storage tank (1) and B glue storage tank (2) respectively, for adjusting the glue output of A glue storage tank (1) and B glue storage tank (2) respectively.

4. A device for reproducing the shape of a high-pressure water jet bore according to claim 1 or 3, characterized in that A glue storage tank (1) and B glue storage tank (2) are made of glass with high transparency, corrosion resistance and high temperature resistance, so that the liquid level in the tank can be directly observed, and the tank can withstand the pressure of the glue liquid without being easily damaged.

5. A device for reproducing the shape of a high-pressure water jet bore according to claim 1 or 2, characterized in that A valve (5) is arranged at the outlet of the mixing and stirring tank, for adjusting the amount of glue entering the vacuum degassing machine (6).

6. A device for reproducing the shape of a high-pressure waterjet bore according to claim 1, characterized in that The conveying silica gel pipe (11) is made of silica gel material, which can resist long-term contact with silica gel raw materials and is not prone to chemical reaction; the inner wall of the conveying silica gel pipe is smooth to reduce the resistance of silica gel in the conveying process and reduce the residual amount of glue.

7. A device for reproducing the shape of a high-pressure waterjet bore according to claim 1, characterized in that The conical pouring head is a detachable conical structure, which is convenient to disassemble and assemble and efficient to clean; the conical pouring head adopts a tapered cavity to concentrate the material flow and smoothly exhaust, effectively reducing bubble defects and improving mold precision and repeatability.

8. A device for reproducing the shape of a high-pressure waterjet bore according to claim 1, characterized in that The device for high-pressure water jet hole forming cavity shape reproduction further comprises a vibrator (13) which is adjusted in vibration frequency by an external controller and assists in vibrating the silica gel around the hole wall during the silica gel pouring process.

9. A method for high-pressure water jet hole forming cavity shape reproduction, which is realized by using the device for high-pressure water jet hole forming cavity shape reproduction according to claims 1-8, comprising the following steps: Select a conical pouring head with a diameter suitable for the experiment, and install it at the end of the conveying silica gel pipe; Adjust the position of the pouring head, and place the conical pouring head directly above the sample hole; Check the pipeline connection state and the overall installation of the equipment; After the equipment is checked, the silica gel in the A glue storage tank and the B glue storage tank is allowed to flow into the mixing and stirring tank, the stirring device is started, and the A glue and the B glue are mixed and stirred, until the mixed liquid is fully stirred without stratification; After the stirring is completed, the valve on the connecting pipeline between the mixing and stirring tank and the vacuum degassing machine is opened, the mixed liquid is allowed to flow into the vacuum degassing machine, then the vacuum pump is started to perform vacuum degassing treatment on the silica gel, until no air bubbles are generated, so as to eliminate the small pores in the mixed liquid; The valve on the connecting pipeline between the vacuum degassing machine and the plunger pump is opened, the plunger pump is started, the degassed mixed liquid is slowly poured into the hole cavity through the silica gel conveying pipe, and low-frequency vibration is performed on the vibrator during the pouring process; After the silica gel is completely solidified, the formed glue is slowly pulled away from the jet hole; The depth, outer diameter and volume of the glue after the mold is removed are measured and recorded.

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