Adjustable gas injection angle device in deep sea mineral pneumatic lifting system and use method thereof

Abstract

The application provides an adjustable gas injection angle device in a deep-sea mineral pneumatic lifting system and a use method, which comprises an upper flange, a lower flange, a multi-angle hole pipeline, a single-hole pipe sleeve, a first driving mechanism, a third driving mechanism, a second driving mechanism and a rotating mechanism. The first driving mechanism rotates the single-hole pipe sleeve, the third driving mechanism drives the injection guide pipe to move up and down, the second driving mechanism drives the injection guide pipe to move radially, and the rotating mechanism rotates the angle of the injection guide pipe, so that the insertion angle of the injection guide pipe is adapted to the angle of the angle hole of the multi-angle hole pipeline, and precise insertion is realized. The application can realize multiple changes of the gas injection angle underwater through one multi-angle hole pipeline and one rotatable gas injection guide pipe, and the operation is convenient. In each experiment, the whole set of equipment does not need to be salvaged, disassembled and reinstalled, but only needs to be controlled by a control signal to control the driving mechanism and the rotating mechanism to work, so that the time for replacing the equipment is reduced. The driving mechanism and the rotating mechanism can be realized by conventional means. Spring+steel ball are used as buckles for auxiliary positioning, and the structure is simple and practical.

Description

Technical Field

[0001] This invention relates to the field of deep-sea mineral gas lifting systems, specifically to a device for adjusting the gas injection angle in deep-sea mineral gas lifting systems. Background Technology

[0002] After a period of development, the most widely used technology in deep-sea mining systems is the riser system, with air lift technology being a hot research topic. It boasts advantages such as low cost and simple structure, making its research crucial. Small-scale experiments conducted in our shipyard at Dalian University of Technology revealed that changes in the air injection angle affect bubble formation, thus impacting the lifting efficiency of the pneumatic lifting system. However, since each angle change requires disassembling and reinstalling the equipment, significant experimental time is wasted. Therefore, we propose an adjustable air injection angle device for remote control and angle adjustment.

[0003] There is a wealth of published information on pneumatic lift pumps: Chinese patent application number 202121394677.X discloses a high-efficiency pneumatic lift pump. It uses a clearing rod to move within the discharge pipe, thereby clearing blockages in the solid-liquid mixture and preventing blockages from affecting the pump's operation. Chinese patent application number 201810672288.5 discloses a bidirectional air-intake pneumatic lift pump, which achieves bidirectional air intake through radial and axial air-intake chambers and an opening. Chinese patent application number 201721088456.3 discloses a vertical air-lift pump with a simple structure, no moving parts, and easy cleaning. Chinese patent application number 201910085163.7 discloses a slurry pneumatic pump with a rifling structure that increases the pump's suction pressure, improving slurry conveying capacity.

[0004] However, the pneumatic lifting devices listed above have limited application scenarios. Apart from being mostly suitable for terrestrial environments, they are even less commonly used in underwater scenarios. Their structures are relatively simple, and the research variables are singular, resulting in a small range of adjustments for large-scale sea trials with high costs. Furthermore, their simple structures lack intelligence. Summary of the Invention

[0005] To address the aforementioned technical issues, an adjustable gas injection angle device and its usage method are provided for a deep-sea mineral gas lifting system.

[0006] The technical means employed in this invention are as follows:

[0007] An adjustable gas injection angle device in a deep-sea mineral gas lifting system includes a multi-angle hole pipe. The upper and lower ends of the multi-angle hole pipe are fixedly connected to the flange holes of the upper flange and the lower flange, respectively. The outer wall of the middle part of the multi-angle hole pipe has a row of angle holes, and the row of angle holes includes multiple angle holes evenly distributed around the outer wall of the multi-angle hole pipe, and the inclination angle of each angle hole is different.

[0008] A single-hole sleeve is provided between the upper flange and the lower flange, which is fitted over the multi-angle hole pipe. The upper and lower ends of the single-hole sleeve are rotatably connected to the flange of the upper flange and the flange of the lower flange, respectively. The single-hole sleeve has a single hole in the middle.

[0009] The lower flange has an annular groove on its flange plate.

[0010] The flange of the lower flange is provided with a radial groove extending in the radial direction of the lower flange at each of the angle holes, and the outer end of the radial groove is connected to the annular groove.

[0011] The lower outer wall of the single-hole sleeve is fixed with a horizontally arranged radial guide rail that extends radially along the lower flange. The radial guide rail has a lower slider that slides with it, and the lower part of the lower slider slides with the annular groove and the radial groove. A first drive mechanism for driving the lower slider to slide along the annular groove is installed on the lower slider. A second drive mechanism for driving the lower slider to slide along the radial groove of the radial guide rail is installed on the lower slider.

[0012] The top of the lower slider is fixed with a vertically arranged vertical guide rail, and an intermediate slider is provided on the vertical guide rail for sliding cooperation with it. The intermediate slider is connected to an air injection conduit for inserting into the single hole and the angle hole through a rotating mechanism. The rotating mechanism is used to rotate the air injection conduit so that its tilt direction matches the tilt direction of the angle hole.

[0013] The intermediate slider is equipped with a third driving mechanism for driving the intermediate slider to slide along the vertical guide rail.

[0014] Preferably, the number of angle holes is 12, and the multi-angle hole pipe has annular sealing ring mounting grooves processed on the upper and lower sides of the row of angle holes, and a sealing ring is installed in the sealing ring mounting groove.

[0015] Preferably, the diameter of the single hole is larger than the diameter of the angled hole, and the inner wall of the single hole sleeve is provided with a sealing ring mounting groove, the position of which corresponds to the sealing ring mounting groove on the outer wall of the multi-angled hole pipe.

[0016] Preferably, the tilt angles of the angle holes are 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, and 60°.

[0017] Preferably, two steel ball buckles are provided at the intersection of the radial groove and the annular groove, and the two steel ball buckles are respectively located on both sides of the radial groove. The steel ball buckle includes a spring located in the lower flange and a steel ball located on the top of the spring.

[0018] Preferably, a sealing sleeve is installed at the angle hole.

[0019] This invention also discloses a method for using an adjustable gas injection angle device in a deep-sea mineral gas lifting system, comprising the following steps:

[0020] S1. The first driving mechanism operates, driving the single-hole pipe to rotate. When the single hole aligns with the desired angled hole, the first driving mechanism stops operating. During the rotation of the single-hole pipe, the two steel ball latches provide precise positioning. The lower slider first rolls over the steel ball latches, causing the steel balls to move downwards. The lower slider continues to slide, and when the two steel balls and the spherical groove on the lower surface of the lower slider are aligned on the same vertical line, the steel balls move upwards, locking the slider. When both steel ball latches pop up simultaneously, the lower slider is also positioned with the radial groove.

[0021] S2. The rotating mechanism operates to rotate the air injection conduit to the angle corresponding to the angle hole; the third driving mechanism operates to make the air injection conduit higher than the single hole and the angle hole.

[0022] S3. The second driving mechanism operates, driving the gas injection conduit and the lower slider to move radially along the radial groove. When the gas injection conduit is inserted obliquely into the single hole and enters the angle hole, the third driving mechanism drives the gas injection conduit to move downward, so that the gas injection conduit is inserted into the angle hole.

[0023] Taking a 5° hole as an example, the first drive mechanism drives the single-hole pipe to rotate. When the single hole is directly opposite the 5° hole, the lower slider is located between the two steel ball buckles. The rotating mechanism rotates the air injection pipe to make its angle also 5°. The third drive mechanism drives the air injection pipe to be higher than the angle hole. The second drive mechanism drives the air injection pipe and the lower slider to move radially along the radial groove. When the air injection pipe enters the single hole and the angle hole, the third drive mechanism also works at the same time, driving the air injection pipe to move downward. Thus, the air injection pipe moves both radially and downward at this time, so that the air injection pipe can be smoothly inserted into the 5° hole to complete the operation.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] (1) The injection angle can be changed multiple times underwater through a multi-angle hole pipe and a rotatable injection pipe, which is convenient to operate.

[0026] (2) Each experiment does not require the entire set of equipment to be retrieved, disassembled, and reinstalled. The drive mechanism and rotation mechanism can be controlled by control signals, which reduces the time required for equipment replacement. The drive mechanism and rotation mechanism can be implemented using conventional methods.

[0027] (3) Coordinate and control between motors through remote signals to achieve automated operation.

[0028] Based on the above reasons, this invention can be widely promoted in fields such as deep-sea mineral pneumatic lifting systems. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of a device structure for an adjustable gas injection angle in a deep-sea mineral gas lifting system, according to a specific embodiment of the present invention.

[0031] Figure 2 This is a side sectional view excluding the drive unit structure.

[0032] Figure 3 This is a cross-sectional schematic diagram of a multi-angle hole pipe structure in a specific embodiment of the present invention.

[0033] Figure 4 This is a cross-sectional schematic diagram of a single-hole sleeve structure in a specific embodiment of the present invention.

[0034] Figure 5 This is a top view of the lower flange structure in a specific embodiment of the present invention.

[0035] Figure 6 for Figure 5 A schematic diagram of the AA cross-section.

[0036] Figure 7 for Figure 5 Schematic diagram of the steel ball buckle structure

[0037] Figure 8 This is a schematic cross-sectional view of the upper flange structure in a specific embodiment of the present invention.

[0038] Figure 9This is a schematic diagram of the middle and lower sliders and their driving structure in a specific embodiment of the present invention.

[0039] Figure 10 This is a step-by-step diagram for the present invention.

[0040] Figure 11 The speed compensation diagram is optimized for this invention.

[0041] In the diagram: 1. Upper flange; 11. Built-in bearing; 2. Lower flange; 21. Annular groove; 22. Radial groove; 23. Annular rack; 24. Conventional rack; 25. Steel ball buckle; 26. Built-in bearing; 3. Multi-angle hole pipe; 31. Angle hole; 32. Sealing ring mounting groove; 4. Single hole sleeve; 41. Single hole; 42. Sealing ring mounting groove; 5. Radial guide rail; 6. Lower slider; 61. First drive mechanism; 62. Second drive mechanism; 7. Vertical guide rail; 8. Middle slider; 81. Rotation mechanism; 82. Third drive mechanism; 9. Air injection conduit. Detailed Implementation

[0042] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] 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, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0045] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0046] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0047] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0048] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0049] like Figures 1-11As shown, this invention provides an adjustable gas injection angle device for a deep-sea mineral gas lifting system, comprising an upper flange 1, a lower flange 2, and a multi-angle hole pipe 3 fixed between the upper flange 1 and the lower flange 2. The outer wall of the middle section of the multi-angle hole pipe 3 has a row of angle holes, and the row of angle holes includes multiple angle holes 31 evenly distributed around the outer wall of the multi-angle hole pipe 3, and each angle hole 31 has a different inclination angle; in this specific embodiment, 12 angle holes are used, with inclination angles of 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, and 60°. The multi-angle hole pipe 3 has annular sealing ring mounting grooves 32 machined on the upper and lower sides of the row of angle holes, and sealing rings (not shown) are installed in the sealing ring mounting grooves.

[0050] like Figure 4 As shown, a single-hole sleeve 4 is provided between the upper flange 1 and the lower flange 2, fitted onto the outside of the multi-angle hole pipe 3. The upper and lower ends of the single-hole sleeve 4 are rotatably connected to the upper flange 1 and the lower flange 2 respectively via an upper built-in bearing 11 and a lower built-in bearing 26. The single-hole sleeve 4 has a single hole 41 in the middle. The diameter of the single hole 41 is larger than the diameter of the angle hole 31, and a double-layer thin flexible material sealing ring (not shown) is installed in the single hole 41. Two annular sealing ring mounting grooves 42 are respectively provided on the upper and lower sides of the single hole.

[0051] like Figure 5-7 As shown, the outermost part of the upper surface of the lower flange 2 is an annular rack 23, with the serrations positioned on the side facing the center. An annular groove 21 is arranged inside the annular rack 23. A radial groove 22 extending in the radial direction of the lower flange 2 is provided at the location corresponding to each angle hole 31, and the outer end of the radial groove 22 communicates with the annular groove 21. A conventional rack 24 is installed at a certain distance on one side of each radial groove 22, its direction parallel to the radial groove 22. Two steel ball catches 25 are provided at the intersection of the radial groove 22 and the annular groove 21, with the two steel ball catches located on both sides of the radial groove 22. Each steel ball catch 25 includes a spring located inside the lower flange 2 and a steel ball located at the top of the spring.

[0052] The lower outer wall of the single-hole sleeve 4 is fixed with a horizontally arranged radial guide rail 5 that extends radially along the lower flange 2. The radial guide rail 5 has a sliding block 6 that slides with it, and the lower part of the sliding block 6 slides with the annular groove 21 and the radial groove 22. A first drive mechanism 61 for driving the sliding block 6 to slide along the annular groove 21 is installed on the sliding block 6. A second drive mechanism 62 for driving the sliding block 6 to slide along the radial groove 22 is installed on the sliding block 6.

[0053] The top of the lower slider 6 is fixed with a vertically arranged vertical guide rail 7, and an intermediate slider 8 is provided on the vertical guide rail 7 for sliding cooperation with it. An air injection conduit 9 for inserting into the single hole 41 and the angle hole 31 is connected to the intermediate slider 8 through a rotating mechanism 81.

[0054] The intermediate slider 8 is equipped with a third drive mechanism 82 for driving the intermediate slider 8 to slide along the vertical guide rail 7.

[0055] If we disregard the presence of a pipe and only consider the lateral characteristics of this bubble plume, the lateral profile distributions of velocity and density at all depths are similar. We can approximate the plume velocity and density distributions using a Gaussian distribution as follows:

[0056]

[0057]

[0058] v is the vertical plume velocity. m ρ is the vertical axis velocity of the plume. w The density of the surrounding water.

[0059] ρ m Let Δρ be the mixing density of the bubble plume. m The density difference between the bubble plume and the surrounding water at a certain depth axis is given by r, where r is the radial coordinate and 1 / λ. 2 Let be the turbulent Schmidt number, and b be the nominal half-width of the plume, which is related to the standard deviation of the velocity distribution. The plume flow rate is obtained by integrating along the radial direction, expressed as:

[0060]

[0061] α represents the entrainment coefficient. The process of gas being injected directly from the bottom and rising is similar to the turbulent diffusion process of a floating jet. It can be known that the entrainment rate of the surrounding water by the bubble plume is proportional to the axial velocity vm and the nominal half-width b of the bubble plume. However, the final results obtained using this device need to be verified using a theoretical model, taking the gas-liquid mixing region as an example:

[0062] 1. Governing equations can be established for the gas-liquid mixing region:

[0063]

[0064] p1 is the static pressure at the inlet of the booster pump, in Pa; p a Atmospheric pressure, Pa; ρ l The density of the liquid is kg / m³. 3 g is the acceleration due to gravity, in m / s². 2 V l The velocity of the liquid at the inlet is in m / s.

[0065] 2. Neglecting the compressibility of the gas, and due to the conservation of mass between cross sections, the continuity equation can be obtained:

[0066] AV2=Q l +Q g (5)

[0067] A is the cross-sectional area of ​​the riser pipe, m 2 V2 is the gas-liquid mixing velocity, m / s; Ql is the liquid volumetric flow rate, m³ / s. 3 / h; Qg is the gas mass flow rate, m 3 / h; via Q l =AV l ,get

[0068]

[0069] 3. Ignoring wall friction, construct the momentum equation between the cross sections:

[0070] Ap1-Ap2=(ρ g Q g +ρ l Q l V2-ρ l Q l V l- ρgQ g V g 7)

[0071] p2 is the static pressure at section 2, in Pa; ρ g The density of the gas is kg / m³. 3 Vg is the gas velocity at the inlet, in m / s. Normally, ρ... g Q g <<ρ l Q l ,

[0072] 4. Finally, substituting equations (4) and (6) into equation (7) simultaneously, we obtain the pressure at section 2:

[0073]

[0074] In summary, due to the characteristics of the bubble plume and the specific application of this device, it is necessary to be able to change the angle of the injection port while minimizing the possibility of gas entering the pipe from one port and then escaping from other angle ports 31, thereby reducing experimental errors and ensuring the accuracy of pressure calculations. Sealing rings are installed using sealing ring mounting grooves 32 and 42. The interference fit between adjacent sealing rings ensures that the resistance of the single-hole pipe 4 is not too high when rotating relative to the multi-angled pipe 3, while also maintaining a certain degree of airtightness. This prevents gas from diffusing into the gaps between pipes through other multi-angled holes 31 on the multi-angled pipe 3, ensuring that the gas can be fully injected into the multi-angled pipe 3.

[0075] The rotating mechanism 81 is used to rotate the air injection conduit 9 so that its tilt direction matches the tilt direction of the angle hole 31. The rotating mechanism 81 can be used in various ways, such as a motor directly rotating the air injection conduit 9, etc. In this specific embodiment, a servo motor is used.

[0076] The first drive mechanism 61, the second drive mechanism 62, and the third drive mechanism 82 are driven by a combination of a motor, gear, and rack. For example, in the first drive mechanism 61, the motor is fixed to the lower slider 6, a gear is fixed to the motor output shaft, and an annular rack 23 is fixed beside the annular groove 21. Similarly, in the second drive mechanism 62, the motor is fixed to the lower slider 6, a gear is fixed to the motor output shaft, and a radially extending rack is fixed beside the radial groove 22. In the third drive mechanism 82, the motor is fixed to the middle slider 8, a gear is fixed to the motor output shaft, and a vertical rack is fixed to the vertical guide rail 7.

[0077] Thus, the entire drive mechanism 61 uses three motors and one servo motor for motion control. A ring-coupled control structure is adopted in the motor control structure. The multi-motor system consists of three parts: the multi-motor system itself, a speed compensator, and a controller. The output of the speed compensator is determined by two parts: the ratio of the moment of inertia of the motor to that of its two adjacent motors, and the difference in speed between the motor and its two adjacent motors. In other words, it is determined by the difference between the average speed of each motor and its own speed. Each motor in the transfer function can be regarded as an integral element, i.e.

[0078]

[0079] J i Let i be the moment of inertia of the i-th motor: i = 1, 2, ..., n.

[0080]

[0081] ω ave It represents the average speed of n motors. The optimized speed compensation diagram is shown below. Figure 11 As shown.

[0082] The speed compensator uses the average of the real-time speeds of multiple motors and the speeds of two adjacent motors, respectively, to calculate K. 12 =K 13 =0.5, and then the difference is calculated with the speed of the i-th motor, with the compensation ratio coefficient being...

[0083] Based on this structure, multi-motor cooperative control can achieve better flexibility, higher control accuracy, and strong steady-state performance.

[0084] Since the application scenario is relatively simple, a traditional PID control algorithm can be used to coordinate the control of multiple motors. The difference between the given input speed x(t) and the actual output value y(t) is e(t). PID control adjusts the speed of the controlled motor using e(t). The specific mathematical expressions for the transfer function and output signal are as follows:

[0085]

[0086]

[0087] T D Kp, T I These represent the differential time constant, the proportional coefficient, and the integral time constant, respectively.

[0088] Thus, the input rotational speed x(t) is processed through the proportional coefficient Kp and the integral coefficient K... I and differential coefficient K D By limiting the output signal u(t), the output signal u(t) is transmitted to the controlled motor through the transfer function. The controlled motor outputs the speed y(t), thereby realizing the control of the motor. In multi-motor systems, this can improve the overall coordination.

[0089] The process of using this invention is as follows:

[0090] The first drive mechanism 61 drives the lower slider 6 to move along the annular groove 21, thereby causing the radial guide rail 5 and the single-hole sleeve 4 to rotate together (circumferential movement).

[0091] When rotated to the required insertion angle hole 31, the lower slider 6 first rolls over the steel ball catch 25, causing the steel ball to move downwards. The lower slider 6 continues to slide, and when the two steel balls and the spherical groove on the lower surface of the lower slider 6 are on the same vertical line in space, the steel balls move upwards and catch the slider. When both steel ball catches 25 pop up simultaneously, the lower slider 6 is also positioned with the radial groove 22.

[0092] At this point, the rotating mechanism 81 is adjusted to rotate the air injection tube 9 to the angle corresponding to the angle hole 31 to be inserted. The third drive mechanism 82 drives the air injection tube 9 to be higher than the angle hole 31.

[0093] Then, the second drive mechanism 62 drives the lower slider 6, vertical guide rail 7, middle slider 8 and air injection conduit 9 to move radially (horizontal movement), and at the same time drives the third drive mechanism 82 to move the middle slider 8 downward (vertical movement), so as to realize the oblique insertion of the air injection conduit 9.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An adjustable gas injection angle device in a deep sea mineral pneumatic hoisting system, characterized by, The multi-angle hole pipe is provided with a row of angle holes in the middle outer wall, and the row of angle holes comprises a plurality of angle holes which are uniformly distributed around the outer wall of the multi-angle hole pipe, and the inclination angles of each angle hole are different. A single-hole pipe sleeve is arranged outside the multi-angle hole pipe between the upper flange and the lower flange, and the upper and lower ends of the single-hole pipe sleeve are rotationally connected with the flange plates of the upper flange and the lower flange respectively. The flange plate of the lower flange is provided with an annular sliding groove in the form of a ring. The flange plate of the lower flange is provided with a radial sliding groove extending in the radial direction of the lower flange at each position corresponding to the angle holes, and the outer end of the radial sliding groove is in communication with the annular sliding groove. The lower outer wall of the single-hole pipe sleeve is fixedly provided with a radial guide rail which is horizontally arranged and extends in the radial direction of the lower flange. The top of the lower sliding block is fixedly provided with a vertical guide rail which is vertically arranged, and the vertical guide rail is provided with an intermediate sliding block which is in sliding fit with the vertical guide rail. The intermediate sliding block is connected with a gas injection guide pipe for being inserted into the single hole and the angle hole through a rotating mechanism.

2. The adjustable gas injection angle device in a deep sea mineral pneumatic hoisting system according to claim 1, characterized in that, The rotating mechanism is used to rotate the gas injection guide pipe so that the inclination direction of the gas injection guide pipe is adapted to the inclination direction of the angle hole.

3. The adjustable gas injection angle device in a deep sea mineral pneumatic hoisting system according to claim 2, characterized in that, The number of the angle holes is 12, and the multi-angle hole pipe is provided with a ring-shaped sealing ring mounting groove on the upper and lower sides of the row of angle holes.

4. The adjustable gas injection angle device in a deep sea mineral pneumatic hoisting system according to claim 2, wherein, The hole diameter of the single hole is larger than the hole diameter of the angle hole, and the inner wall of the single-hole pipe sleeve is provided with a sealing ring mounting groove which corresponds to the sealing ring mounting groove on the outer wall of the multi-angle hole pipe.

5. The adjustable gas injection angle device in a deep sea mineral pneumatic hoisting system according to claim 1, wherein, The inclination angles of the angle holes are 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55° and 60° respectively.

6. The adjustable gas injection angle device in a deep sea mineral pneumatic hoisting system according to claim 1, wherein, Two steel ball buckles are arranged at the intersection of the radial sliding groove and the annular sliding groove. The angle hole is provided with a sealing sleeve.

7. The use method of the adjustable gas injection angle device in the deep-sea mineral gas power lifting system according to any one of claims 1-6, comprising the following steps: S1, the first driving mechanism works to drive the single-hole pipe to rotate, and when the single hole is opposite to the angle hole to be connected, the first driving mechanism stops working. S2, the rotating mechanism works to rotate the injection conduit to the corresponding angle required by the angle hole; the third driving mechanism works to make the injection conduit higher than the single hole and the angle hole, S3, the second driving mechanism works to drive the injection conduit and the lower sliding block to move along the radial sliding groove, when the injection conduit is inserted into the angle hole obliquely through the single hole, the third driving mechanism drives the injection conduit to move downward, so that the injection conduit is inserted into the angle hole.

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