Pulsed jet generation device with abrasive advanced mixing bin and method

Abstract

The invention discloses a front-mixing type high-pressure pulse abrasive jet generating device and method, solves the problem that in the prior art, the premixing effect of abrasive and water is poor, and has the beneficial effects that the premixing effect of the abrasive and the water is guaranteed, and the jet operation efficiency is improved. Comprising an abrasive supply unit and a water supply unit, the abrasive supply unit comprises an abrasive box body, the abrasive box body is communicated with an abrasive mixing bin through a first pipeline, a first pump body is arranged at the first pipeline, the water supply unit comprises a water box body, the water box body is communicated with the abrasive mixing bin through a second pipeline, and a second pump body is arranged at the second pipeline; the angle formed between the communicated sections of the first pipeline, the second pipeline and the abrasive material mixing bin is 90 degrees, the abrasive material mixing bin is connected with a pressurizing bin, the pressurizing bin is connected with a third pump body and communicated with an aeration chamber capable of introducing pulse type bubbles, and water is supplied into the pressurizing bin through the third pump body.

Description

Technical Field

[0001] This invention relates to the field of jet technology, and in particular to a premixed high-pressure pulse abrasive jet generator and method. Background Technology

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

[0003] High-pressure abrasive waterjet technology is widely used in hard rock crushing and engineering cutting due to its high efficiency, dust-free operation, and low heat generation. Based on the mixing method of the abrasive and water, it can be divided into pre-mixing and post-mixing types. Pre-mixing abrasive jets complete the thorough mixing of abrasive and water before high-pressure pumping, resulting in a longer abrasive acceleration time, higher mixing uniformity, and significantly higher rock-breaking and cutting efficiency than post-mixing jets, making it a preferred method for engineering operations.

[0004] Compared to continuous jets, pulsed jets can effectively reduce the water cushion effect and improve energy utilization. Their generation methods mainly include extrusion, self-excited, and truncated types. Extrusion-type pulsed jets have complex structures and are difficult to control parameters; self-excited pulsed jets have stringent requirements for nozzle structure and a complex generation mechanism; truncated pulsed jets have become mainstream due to their simple device and ease of adjustment, but they form pulses by blocking continuous jets with orifice plates or other truncating devices, and direct impact of the jet on the truncating devices can cause severe wear and aging.

[0005] Post-mixing abrasive jets mix high-pressure water with abrasive near the nozzle outlet or at the end of the nozzle. The abrasive is drawn in by negative pressure or fed in at low pressure. The mixing time with high-pressure water is short, the acceleration is insufficient, the jet energy utilization rate is low, the rock breaking efficiency is limited, and it is difficult to stably form a controllable pulse jet.

[0006] The inventors discovered that existing premixed abrasive jet devices simply supply abrasive and water into the mixing chamber in a set ratio without considering the mixing effect of abrasive and water. This results in poor premixing of abrasive and water, affecting the efficiency of jet operation and causing poor continuity of abrasive supply. Furthermore, the mixing ratio of abrasive and water cannot be adapted to different types of rocks. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the purpose of this invention is to provide a premixed high-pressure pulse abrasive jet generator that achieves efficient premixing of abrasive and water, eliminates the need for a truncated pulse structure, fundamentally avoids equipment wear, and can adapt to rock mass characteristics to adjust the grinding-water ratio, thereby improving jet rock-breaking efficiency and device applicability.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solution: A pre-mixed high-pressure pulsed abrasive jet generator includes an abrasive supply unit and a water supply unit. The abrasive supply unit includes an abrasive housing, which is connected to an abrasive mixing chamber via a first pipeline. A first pump is installed at the first pipeline. The water supply unit includes a water tank, which is connected to the abrasive mixing chamber via a second pipeline. A second pump is installed at the second pipeline. The angle formed between the first pipeline, the second pipeline, and the section connecting to the abrasive mixing chamber is 90°. The abrasive mixing chamber is connected to a pressurization chamber, which is connected to a third pump. The pressurization chamber is connected to an aeration chamber through which pulsed air bubbles can be introduced. Water is supplied to the pressurization chamber via the third pump, so that the abrasive mixing chamber and water with a set pressure are mixed in the pressurization chamber, then enter the aeration chamber, and finally sprayed out through a nozzle.

[0009] In the premixed high-pressure pulsed abrasive jet generator described above, the angle between the section of the first pipeline, the second pipeline and the section of the abrasive mixing chamber that are connected to the vertical central axis of the abrasive mixing chamber is 30°-60°.

[0010] The premixed high-pressure pulsed abrasive jet generator described above also includes a control unit, which is individually connected to the first pump body, the second pump body, and the third water pump.

[0011] As described above, in a pre-mixed high-pressure pulsed abrasive jet generator, the output end of the gas-incorporating chamber is connected to the nozzle via a pipeline. A rock mass camera is installed at the pipeline and connected to the control unit. The rock mass camera can capture images of the working rock mass and send them to the control unit. The control unit obtains rock mass characteristic data based on the image information and determines the rock mass type. The control unit determines the delivery flow rate of the first pump and the second pump based on the rock mass type.

[0012] As described above, in a pre-mixed high-pressure pulsed abrasive jet generator, the outlet end of the abrasive mixing chamber is connected to the pressurizing chamber via a third pipeline, the third pipeline being equipped with a pressure regulating element. The third pump body is connected to the pressurizing chamber via a fourth pipeline, the third pipeline being equipped with a switching element. The top side of the pressurizing chamber is connected to the third pipeline, the side of the pressurizing chamber is connected to the fourth pipeline, and a conical inlet is provided at the end of the pressurizing chamber away from the fourth pipeline. The pressure regulating element and the switching element are both connected to the control unit.

[0013] As described above, in a premixed high-pressure pulsed abrasive jet generator, the gas mixing chamber is connected to an air pump via an air path, and a pulsed solenoid valve is installed in the air path, which is connected to the control unit.

[0014] As described above, in a pre-mixed high-pressure pulsed abrasive jet generator, the top two sides of the abrasive mixing chamber are respectively connected to the first pipeline and the second pipeline. The bottom of the abrasive mixing chamber is conical. Multiple anti-impact baffles are installed on one side of the abrasive mixing chamber near the bottom. Each anti-impact baffle is at a set angle to the central axis of the abrasive mixing chamber. A stirring blade is installed at the bottom of the abrasive mixing chamber.

[0015] As described above, in a pre-mixed high-pressure pulsed abrasive jet generator, the abrasive mixing chamber is provided with a cleaning port, and a quick-opening cover is provided at the cleaning port. The quick-opening cover is in sealed contact with the cleaning port. One side of the quick-opening cover is hinged to the body of the abrasive mixing chamber, and the other side is provided with a switch lock.

[0016] As described above, in a premixed high-pressure pulsed abrasive jet generator, an inclined guide plate and a vibrator are provided at the bottom of the abrasive box. The inclined guide plate and the vibrator are spaced apart. The inclined guide plate is placed on the periphery of the vibrator and is inclined. The inclined guide plate is inclined at an angle of 10°-23° relative to the abrasive box.

[0017] Secondly, the present invention also provides a method for operating a pre-mixed high-pressure pulsed abrasive jet generator, comprising the following: The abrasive supply unit and the water supply unit are respectively connected to the abrasive mixing chamber; The abrasive mixing chamber is connected to the pressurization chamber, the pressurization chamber is connected to the third pump body, and the pressurization chamber is connected to the gas mixing chamber that can be filled with pulsed bubbles; Water is supplied to the pressurization chamber via a third pump, allowing the abrasive mixing chamber and water at a set pressure to mix in the pressurization chamber before entering the air mixing chamber and finally being sprayed out through a nozzle.

[0018] The beneficial effects of the present invention are as follows: This invention involves supplying abrasive to the abrasive mixing chamber via a first pump and water to the same chamber via a second pump. Because the angle between the first and second pipelines and the section connecting them to the mixing chamber is 90°, the abrasive and water collide under a set pressure within the mixing chamber, utilizing the impact kinetic energy for initial, efficient fusion. A pressurization chamber is also included, connected to a third pump. Water is supplied to the pressurization chamber via the third pump, allowing for further and thorough fusion of the abrasive and pressurized water. The mixture then enters an aeration chamber, where pulsed bubbles are introduced, ultimately causing the abrasive slurry to be ejected through a nozzle. The entire process involves two stages of premixing: kinetic energy impact and further mixing with pressurized water in the pressurization chamber. These two stages ensure effective premixing of the abrasive and water. Finally, pulsed bubbles provide non-contact separation of the abrasive jet, forming a pulsed abrasive jet, further guaranteeing the premixing effect and improving the efficiency of the jetting operation. Attached Figure Description

[0019] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0020] Figure 1 This is a front view of a premixed high-pressure pulsed abrasive jet generator according to one or more embodiments of the present invention.

[0021] Figure 2 This is a longitudinal cross-sectional view of the abrasive mixing chamber in a premixed high-pressure pulse abrasive jet generator according to one or more embodiments of the present invention.

[0022] Figure 3 This is a cross-sectional view of the abrasive mixing chamber in a premixed high-pressure pulse abrasive jet generator according to one or more embodiments of the present invention.

[0023] Figure 4 This is a schematic diagram of a single anti-impact baffle in the abrasive mixing chamber of a pre-mixed high-pressure pulse abrasive jet generator according to one or more embodiments of the present invention.

[0024] The diagram exaggerates the spacing or dimensions between parts to show their positions; the diagram is for illustrative purposes only.

[0025] The components are: 1. Abrasive box, 2. Water tank, 3. First pump body, 4. First electronic pulse valve, 5. Second pump body, 6. Second electronic pulse valve, 7. Abrasive mixing chamber, 8. Pressure regulating element, 9. Third pump body, 10. Switching element, 11. Pressurization chamber, 12. Gas mixing chamber, 13. Pulse solenoid valve, 14. High-pressure air pump, 15. Rock mass camera, 16. Nozzle, 17. Rock mass, 18. First pipeline, 19. Second pipeline, 20. Third pipeline, 21. Fourth pipeline, 22. Fifth pipeline, 23. Air passage, 24. Anti-impact baffle, 25. Support. Detailed Implementation

[0026] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0027] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless otherwise expressly indicated by the invention, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. As described in the background section, the existing technology suffers from poor premixing of abrasive and water. In order to solve the above technical problem, the present invention proposes a premixed high-pressure pulse abrasive jet generator.

[0028] Example 1 In a typical embodiment of the present invention, reference is made to Figure 1 As shown, a premixed high-pressure pulsed abrasive jet generator includes an abrasive supply unit and a water supply unit. The abrasive supply unit includes an abrasive tank 1, a first pump body 3, and a first electronic pulse valve 4. The water supply unit includes a water tank 2, a second pump body 5, and a second electronic pulse valve 6. The abrasive supply unit and the water supply unit are connected to an abrasive mixing chamber 7. The abrasive mixing chamber 7 is connected to a pressurized chamber 11. The pressurized chamber 11 is connected to a third pump body 9 and is connected to an aeration chamber 12. Water is supplied to the pressurized chamber 11 through the third pump body 9, so that the abrasive mixing chamber 7 and water with a set pressure are mixed in the pressurized chamber 11, and then enter the aeration chamber 12. Finally, it is ejected through a nozzle 16. The whole process is premixed through two stages: kinetic energy impact and further mixing with water with a set pressure in the pressurized chamber. The two stages ensure the premixing effect of the abrasive and water. Finally, the abrasive jet is non-contactly separated by pulsed bubbles to form a pulsed abrasive jet, ensuring the premixing effect of the abrasive and water.

[0029] It should be noted that the angle between the section of the first pipe 18 and the second pipe 19 connected to the abrasive mixing chamber 7 and the vertical central axis of the abrasive mixing chamber 7 is 30°-60°. However, as long as the angle formed between the section of the first pipe 18 and the second pipe 19 connected to the abrasive mixing chamber 7 is 90°, and because the abrasive and water are pumped in through the first pump body 3 and the second pump body 5 respectively, they have a set pressure when entering the abrasive mixing chamber 7. This allows the abrasive and water to achieve high-pressure impact in the air within the abrasive mixing chamber 7, and to complete the initial efficient fusion using the impact kinetic energy.

[0030] Specifically, the abrasive box 1 is connected to the abrasive mixing chamber 7 through the first pipeline 18. A first pump body 3 and a first electronic pulse valve 4 are installed at the first pipeline 18. The abrasive box 1 is used to store diamond abrasive. The first pump body 3 is a variable frequency screw pump. The abrasive is transported from the abrasive box 1 to the first electronic pulse valve 4 through the first pump body 3. The first electronic pulse valve 4 injects the abrasive into the abrasive mixing chamber 7 in a pulse at a set frequency, such as 100Hz, at a 45° angle. The vibrator is an existing vibrating motor.

[0031] The water tank 2 is connected to the abrasive mixing chamber 7 through the second pipeline 19. The second pipeline 19 is equipped with a second pump body 5 and a second electronic pulse valve 6. The water tank 2 is used to store clean water. The water tank 2 is equipped with a liquid level monitor and a liquid replenishment interface. The liquid level monitor is an existing water level monitor used to monitor the liquid level in the water tank 2 so that liquid can be replenished in time through the liquid replenishment interface. The second pump body 5 is a variable frequency screw pump. The clean water is delivered to the second electronic pulse valve 6 through the second pump body 5. The second electronic pulse valve 6 synchronously pulses the clean water into the abrasive mixing chamber 7 at a frequency of 100Hz at a symmetrical 45° tilt angle. The abrasive and clean water achieve 45° high-pressure air impact in the mixing chamber to complete the initial mixing. It is easy to understand that the angle of inclination between the section of the first pipe 18 and the second pipe 19 connected to the abrasive mixing chamber 7 and the vertical central axis of the abrasive mixing chamber 7 can also be other angles, as long as the included angle between the first pipe 18 and the second pipe 19 is 90°.

[0032] In this embodiment, the abrasive mixing chamber 7 is a high-pressure resistant cavity structure with a ceramic coating on the inner wall. An anti-impact baffle 24 is installed inside the chamber near the bottom. (Refer to...) Figure 2 and Figure 3 As shown, multiple anti-impact baffles 24 are arranged around the inner wall of the abrasive mixing chamber 7. Each anti-impact baffle 24 is at a set angle (e.g., 50°) to the central axis of the abrasive mixing chamber 7. Adjacent anti-impact baffles 24 are spaced apart. One anti-impact baffle 24 is positioned close to one end of its adjacent anti-impact baffle, and is spaced apart from the adjacent anti-impact baffle. The other end of the anti-impact baffle 24 is fixed to the inner wall of the abrasive mixing chamber 7. The inner side of the anti-impact baffle 24 is fixed to the inner wall of the abrasive mixing chamber 7 by a bracket 25. (Refer to...) Figure 4As shown, the anti-impact baffle 24 is a rectangular structure. The height of the anti-impact baffle 24 is less than or equal to half the height of the abrasive mixing chamber 7. When the abrasive and clean water are pulsed into the abrasive mixing chamber 7 through the first and second pipelines at a 45° angle and frequency, the anti-impact baffle 24 can effectively change the direction of fluid movement, causing the abrasive particles and clean water to form a more complex turbulent mixing state within the abrasive mixing chamber 7, further improving the uniformity of mixing. This not only avoids the direct scouring of the chamber wall by the high-speed jet, extending the service life of the abrasive mixing chamber, but also ensures the full dispersion of the abrasive in the water by increasing the collision probability and contact time between the abrasive and water, laying a solid foundation for the subsequent formation of a stable and efficient high-pressure abrasive jet. Figure 2 , 3 4. Construction diagram of the anti-impact baffle plate in the abrasive mixing chamber.

[0033] It should be explained that the bottom of the abrasive mixing chamber 7 is equipped with stirring blades, which are offset from the third pipeline. The stirring blades are made of tungsten carbide and are driven by a micro-frequency conversion motor with a stirring speed of 1000 r / min. The abrasive and water after impact are thoroughly mixed a second time by the stirring blades to form a uniform abrasive slurry. The mass ratio of abrasive to water is adjusted to 1:4, which is suitable for the rock breaking requirements of granite and hard rock. The device enables the abrasive and water to impact at a 45° angle in the abrasive mixing chamber under high pressure in the air. The impact kinetic energy is used to achieve the initial efficient fusion of the two. Then, the mechanical stirring of the stirring blades at the bottom of the chamber completes the secondary mixing, forming a dual premixing structure of "pulse impact + mechanical stirring". Compared with the traditional single mixing method, the mixing uniformity of abrasive and water is improved by more than 60%, the abrasive acceleration time is significantly extended, and the jet energy utilization rate is improved.

[0034] The bottom of the abrasive mixing chamber 7 is connected to the pressure chamber 11 through a third pipeline. A pressure regulating element 8 is installed at the third pipeline. The pressure regulating element 8 is specifically an electric pressure regulating valve. After the abrasive slurry is stabilized to a set pressure, such as 50MPa, by the pressure regulating element 8, it is transported to the pressure chamber 11. It should be noted that the abrasive mixing chamber 7 is equipped with a cleaning port, and a quick-opening cover is installed at the cleaning port. The quick-opening cover is in sealed contact with the cleaning port. One side of the quick-opening cover is hinged to the body of the abrasive mixing chamber 7, and the other side is equipped with a switch lock, which is an existing structure.

[0035] Additionally, the third pump body 9 is connected to the pressurization chamber 11 via the fourth pipeline. The third pump body 9 is a high-pressure plunger pump, and the output set pressure, such as 200MPa high-pressure water, enters the pressurization chamber 11 via the switching element 10 (such as a high-pressure electric ball valve). The top of the pressurization chamber 11 is connected to the third pipeline, and the side of the pressurization chamber 11 is connected to the fourth pipeline. A conical inlet is provided at the end of the pressurization chamber 11 away from the fourth pipeline, with an angle of 30°-60°. The conical inlet is connected to the air mixing chamber 12 via the fifth pipeline, thus creating a streamline in the pressurization chamber 11. Under the action of the flow guide structure (conical inlet on the outlet side), the high-pressure water fully entrains the abrasive slurry, and the two are deeply integrated to form a 200MPa high-pressure abrasive jet. The high-pressure abrasive jet smoothly enters the air mixing chamber 12 through the conical inlet. The high-pressure water is delivered by the third pump body 9 to fully entrain the abrasive premix in the pressurization chamber 11, further enhancing the fusion effect of abrasive and high-pressure water, and improving the overall pressure and energy of the abrasive jet. At the same time, the streamlined flow guide structure in the pressurization chamber effectively reduces turbulence and pressure loss, ensuring the stability of the high-pressure abrasive jet.

[0036] The high-pressure air pump 14 is connected to the gas mixing chamber 12 through the air passage. The air passage is equipped with a pulse solenoid valve 13. The high-pressure gas output by the high-pressure air pump 14 at a set pressure, such as 3MPa, is converted into 150Hz pulsed bubbles through the pulse solenoid valve 13 (high-frequency high-pressure solenoid valve) and injected into the gas mixing chamber 12. The bubbles separate the continuous high-pressure abrasive jet without contact, forming a pulsed abrasive jet with high-pressure bubbles between each jet segment. It should be noted that the device also includes a control unit, which is individually connected to the first pump body 3, the second pump body 5, and the third water pump 9. The first electronic pulse valve 4, the second electronic pulse valve 6, the pulse solenoid valve 13, the pressure regulating element 8, and the switching element 10 are all connected to the control unit so that the control unit can control the opening or closing of each component, determine the delivery flow rate of the first pump body 3 and the second pump body 5 according to the rock type, and control the action of the first electronic pulse valve 4 and the second electronic pulse valve 6. In this way, the grinding water ratio is adjusted according to the rock mass characteristics, improving the jet rock breaking efficiency and the applicability of the device. Moreover, the control unit stores the delivery flow rate ratio of the first pump body 3 and the second pump body 5 corresponding to different rock mass characteristics.

[0037] Among them, the ratio range of the flow rates of the first pump body 3 and the second pump body 5 is 1:3 to 1:12, and each type of soft rock, medium hard rock and hard rock is adapted to a specific ratio range. Combined with the real-time recognition of the rock mass camera and the adaptive adjustment of the control system, the linkage control of parameters such as grinding water ratio, jet pressure and pulse frequency is realized, which greatly improves the adaptability of the device to different rock types and increases the rock breaking efficiency by more than 50% compared with traditional devices.

[0038] In addition, the jet inlet of the gas mixing chamber 12 has a conical contraction structure, and the inner wall is treated with wear-resistant and impact-resistant material. The connection between the pulse solenoid valve and the gas mixing chamber is equipped with a sealing element. The outlet of the gas mixing chamber 12 is connected to the nozzle 16 through the sixth pipeline. This abandons the traditional cut-off pulse generation structure and adopts a pulse generation method with non-contact separation of bubbles. The high-pressure gas is converted into pulsed bubbles and injected into the gas mixing chamber through the pulse solenoid valve. The continuous high-pressure abrasive jet is separated to form a pulse jet. There is no need to set up a cut-off device, which completely avoids the wear and aging of equipment caused by abrasive scouring and jet impact. The service life of the device is increased by more than 80%, while reducing energy waste and further improving the jet energy utilization rate. Nozzle 16 is an ultra-fine crystalline tungsten carbide nozzle. A rock mass camera 15 is installed at the sixth pipeline. The rock mass camera 15 is a high-definition industrial camera, positioned facing the rock mass 17, to capture real-time images of the rock mass and transmit them to the control unit. The control unit is a PLC controller or other type of controller. After the rock mass camera 15 identifies the distribution of rock mass fissures, the control unit fine-tunes the output pressure of the third pump to 220MPa to adapt to the characteristics of the rock mass. The pulsed abrasive jet is sprayed at high speed onto the surface of the rock mass 17 through the nozzle 16 with an aperture of 1.3mm-1.7mm, such as 1.5mm. The impact force of the pulsed jet and the grinding force of the abrasive are used to break up the hard rock. It needs to be explained that the rock mass camera 15 is capturing and identifying the working rock mass 17. The captured image is transmitted to the control unit. The control unit obtains characteristic data such as rock mass type, hardness, and fracture distribution based on the image information. After analysis, the control unit determines the rock mass type. After determining that the rock mass type is sandstone (medium-hard rock), it determines the mass ratio of abrasive to water and sends the corresponding data to the first pump body 3 and the second pump body 5. This achieves the adjustment of the delivery flow of the first pump body 3 and the second pump body 5. The control unit controls the first electronic pulse valve 4 and the second electronic pulse valve 6 to open synchronously at high frequency and controls the opening time of the switching element to control the delivery flow of high-pressure water into the pressurization chamber 11, so that the high-pressure water and abrasive are mixed in a ratio that meets the abrasive ratio required for the rock being broken.

[0039] The device provided in this embodiment adopts a dual premixing method of 45° pulse impact + mechanical stirring, which can achieve efficient and uniform fusion of abrasive and water. It also has non-contact pulse generation, rock mass identification and parameter adaptive adjustment functions. The jet pressure is adjustable from 100MPa to 350MPa, the impact pulse frequency is 0Hz to 200Hz, and the bubble separation pulse frequency is 0Hz to 300Hz. It is suitable for operation scenarios such as deep well hard rock, mining, and tunnel rock breaking.

[0040] In addition, the overall structure is compact, and the modules are connected by sealed joints, which facilitates disassembly, maintenance and on-site relocation. At the same time, the abrasive box and water tank are equipped with auxiliary structures such as liquid level monitoring to ensure the continuity of material supply and the stability of operation of the device.

[0041] Example 2 This embodiment discloses a working method for a pre-mixed high-pressure pulse abrasive jet generator, including the following: Rock mass identification and parameter preset: The rock mass camera 15 is activated to capture and identify the working rock mass 17. The captured image is transmitted to the control unit. The control unit obtains characteristic data such as rock mass type, hardness, and fracture distribution based on the image information. After analysis, the control unit determines the rock mass type. After determining that the rock mass type is sandstone (medium-hard rock), the abrasive and water mass ratio is automatically preset to 1:6, the impact pulse frequency is 80Hz, the stirring speed is 800r / min, the jet pressure is 150MPa, and the bubble separation frequency is 100Hz. Material feeding and pulse impact preparation: The control unit starts the first pump body 3 and the second pump body 5, and adjusts the delivery flow of the two variable frequency screw pumps according to the preset grinding water ratio of 1:6, so as to deliver the abrasive in the abrasive box 1 and the clean water in the water tank 2 to the first electronic pulse valve 4 and the second electronic pulse valve 6 respectively, while adjusting the pump body output pressure to ensure that the jet kinetic energy of the abrasive and the water is matched. Synchronous pulse impact mixing: The control unit controls the first electronic pulse valve 4 and the second electronic pulse valve 6 to open synchronously at a frequency of 80Hz, injecting abrasive and water into the abrasive mixing chamber 7 in a symmetrical 45° tilt angle pulse. The abrasive and water achieve high-pressure impact in the air within the mixing chamber, and use the impact kinetic energy to complete the initial efficient fusion. Secondary mechanical mixing: The tungsten carbide stirring blades at the bottom of the abrasive mixing chamber 7 rotate at a high speed of 800 r / min driven by a micro frequency conversion motor, which fully mechanically stirs the impact-mixed abrasive and water, completing the secondary premixing and forming a uniform abrasive slurry. Pressure regulating and stabilizing conveying: The abrasive slurry flows out from the outlet of the abrasive mixing chamber 7, and after being stabilized to 40MPa by the pressure regulating element 8, it is smoothly conveyed to the pressurization chamber 11. The pressure sensor and flow sensor monitor the slurry pressure and flow in real time and feed back to the control unit to realize closed-loop control of pressure and flow. High-pressure entrainment enhancement: The control unit starts the third pump body 9 and the switching element 10. The third pump body 9 outputs a preset 150MPa high-pressure water which enters the pressurization chamber 11 through the switching element 10. Under the action of the streamlined flow guiding structure of the pressurization chamber 11, the high-pressure water fully entrains the abrasive slurry. The two are deeply integrated to form a high-pressure abrasive jet. The jet smoothly enters the air-injection chamber 12 through the conical contraction inlet. Non-contact pulse formation: The control unit starts the high-pressure air pump 14 and the pulse solenoid valve 13. The high-pressure air pump 14 outputs a continuous high-pressure gas of 2MPa, which is converted into a 100Hz pulsed bubble by the pulse solenoid valve 13. The bubble is precisely injected into the gas mixing chamber 12, which performs non-contact separation of the continuous high-pressure abrasive jet entering the gas mixing chamber 12, forming a pulsed abrasive jet. Pulse jet rock breaking: The pulsed abrasive jet formed in the air-injection chamber 12 is sprayed at high speed through the nozzle 16 onto the surface of the sandstone rock mass 17. The impact force of the pulse jet and the grinding force of the abrasive are used to break up medium-hard rock. During the operation, the rock mass camera 15 continuously identifies the characteristics of the rock mass. If the local hardness of the rock mass changes, the control unit dynamically adjusts parameters such as the grinding water ratio and jet pressure in real time to ensure the rock breaking efficiency. Shutdown and maintenance: After the rock breaking operation is completed, the control unit shuts down the high-pressure air pump 14, the third pump body 9, the first / second pump body and other equipment in sequence, and opens the quick-opening cleaning port of the abrasive mixing chamber 7 to perform high-pressure cleaning on the mixing chamber, pressurizing chamber, pipelines, nozzles and so on to prevent abrasive residue from clumping.

[0042] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A pre-mixed high-pressure pulsed abrasive jet generator, characterized in that, The device includes an abrasive supply unit and a water supply unit. The abrasive supply unit includes an abrasive housing, which is connected to an abrasive mixing chamber via a first pipeline. A first pump is installed at the first pipeline. The water supply unit includes a water tank, which is connected to the abrasive mixing chamber via a second pipeline. A second pump is installed at the second pipeline. The angle formed between the first pipeline, the second pipeline, and the section connecting to the abrasive mixing chamber is 90°. The abrasive mixing chamber is connected to a pressurization chamber, which is connected to a third pump. The pressurization chamber is connected to an aeration chamber that allows pulsed air bubbles to enter. Water is supplied to the pressurization chamber via the third pump, so that the abrasive mixing chamber and water at a set pressure are mixed in the pressurization chamber, then enter the aeration chamber, and finally sprayed out through a nozzle.

2. The pre-mixed high-pressure pulsed abrasive jet generator according to claim 1, characterized in that, The angle between the section of the first pipeline, the second pipeline and the section of the abrasive mixing chamber that connects to the vertical central axis of the abrasive mixing chamber is 30°-60°.

3. The pre-mixed high-pressure pulsed abrasive jet generator according to claim 1, characterized in that, It also includes a control unit, which is individually connected to the first pump body, the second pump body, and the third water pump.

4. The pre-mixed high-pressure pulsed abrasive jet generator according to claim 3, characterized in that, The output end of the gas mixing chamber is connected to the nozzle through a pipeline. A rock mass camera is installed at the pipeline and connected to the control unit. The rock mass camera can capture images of the working rock mass and send them to the control unit. The control unit obtains rock mass characteristic data based on the image information and determines the rock mass type. The control unit determines the delivery flow rate of the first pump and the second pump based on the rock mass type.

5. The pre-mixed high-pressure pulsed abrasive jet generator according to claim 3, characterized in that, The outlet of the abrasive mixing chamber is connected to the pressurizing chamber via a third pipeline, which is equipped with a pressure regulating element. The third pump body is connected to the pressurizing chamber via a fourth pipeline, which is equipped with a switching element. The top side of the pressurizing chamber is connected to the third pipeline, and the side of the pressurizing chamber is connected to the fourth pipeline. A conical inlet is provided at the end of the pressurizing chamber away from the fourth pipeline. The pressure regulating element and the switching element are both connected to the control unit.

6. A pre-mixed high-pressure pulsed abrasive jet generator according to claim 3 or 5, characterized in that, The gas mixing chamber is connected to the gas pump via a gas path, and the gas path is equipped with a pulse solenoid valve, which is connected to the control unit.

7. The pre-mixed high-pressure pulsed abrasive jet generator according to claim 1, characterized in that, The top two sides of the abrasive mixing chamber are connected to the first pipeline and the second pipeline respectively. The bottom of the abrasive mixing chamber is conical. Multiple anti-impact baffles are installed inside the abrasive mixing chamber near the bottom. Each anti-impact baffle is at a set angle to the central axis of the abrasive mixing chamber. A stirring blade is installed at the bottom of the abrasive mixing chamber.

8. The pre-mixed high-pressure pulsed abrasive jet generator according to claim 1, characterized in that, The abrasive mixing chamber is equipped with a cleaning port, and a quick-opening cover is installed at the cleaning port. The quick-opening cover is in sealed contact with the cleaning port. One side of the quick-opening cover is hinged to the body of the abrasive mixing chamber, and the other side is equipped with a switch lock.

9. The operating method of a pre-mixed high-pressure pulsed abrasive jet generator according to any one of claims 1-8, characterized in that, Includes the following: The abrasive supply unit and the water supply unit are respectively connected to the abrasive mixing chamber; The abrasive mixing chamber is connected to the pressurization chamber, the pressurization chamber is connected to the third pump body, and the pressurization chamber is connected to the gas mixing chamber that can be filled with pulsed bubbles; Water is supplied to the pressurization chamber via a third pump, allowing the abrasive mixing chamber and water at a set pressure to mix in the pressurization chamber before entering the air mixing chamber and finally being sprayed out through a nozzle.

Images