Powder injection device

Abstract

The utility model provides a powder injection device, and belongs to the technical field of powder injection, the powder injection device comprises a powder storage barrel and a powder injection barrel, and a valve body capable of being opened and closed is arranged between the powder storage barrel and the powder injection barrel. The powder injection device is divided into the powder storage barrel and the powder injection barrel, the powder storage barrel and the powder injection barrel are separated through the valve body, the valve body is designed to be in an openable and closable form, powder in the powder injection barrel is supplemented through the powder storage barrel, discharging is conducted through the powder outlet of the powder injection barrel, and the risk that the powder outlet is blocked due to the fact that a large amount of powder flows into the powder outlet can be reduced.

Description

Technical Field

[0001] This application relates to the technical field of powder injection and feeding, and particularly to a powder injection device. Background Art

[0002] In the existing powder injection device, the powder outlet is prone to being blocked by powder during powder injection.

[0003] The above is only a description of related technologies, and it does not mean that the applicant admits the above as the prior art.

[0004] In view of this, it is necessary to provide a new powder injection device to solve or at least alleviate the above technical defects. Utility Model Content

[0005] In view of the above problems, this application provides a powder injection device, aiming to improve the technical problem that the powder is prone to block the powder outlet during the powder injection process in related technologies.

[0006] According to some embodiments of this application, a powder injection device is provided, including a powder storage cylinder and a powder injection cylinder, and a valve body that can be opened and closed is provided between the powder storage cylinder and the powder injection cylinder.

[0007] By separating the powder injection device into a powder storage cylinder and a powder injection cylinder, the powder storage cylinder and the powder injection cylinder are separated by the valve body, and the valve body is designed to be openable and closable. The powder in the powder injection cylinder is replenished through the powder storage cylinder, and the material is discharged through the powder outlet of the powder injection cylinder, which can reduce the risk of the powder outlet being blocked due to a large amount of powder pouring into the powder outlet.

[0008] In some embodiments, the powder injection device further includes a transmission rod, and the transmission rod is connected to the valve body to control the opening and closing of the valve body.

[0009] By arranging the transmission rod to extend into the accommodation cavity of the powder injection device and connect with the valve body, the opening and closing of the valve body can be controlled externally, improving the convenience and safety of operation.

[0010] In some embodiments, the transmission rod is used to drive the valve body to move along the central axis of the powder storage cylinder to control the opening and closing of the valve body.

[0011] The opening and closing of the valve body can be controlled by the vertical movement of the transmission rod. The operation is simple and does not require complex equipment drive, reducing the manufacturing cost of the powder injection device.

[0012] In some embodiments, the transmission rod is connected to the valve body to control the rotation of the valve body.

[0013] By arranging the transmission rod to drive the valve body to rotate, the transmission rod can not only drive the valve body to rotate but also drive the valve body to move axially, thereby agitating the powder in the powder injection device and reducing the possibility of the powder being in an abnormal state.

[0014] In some embodiments, the valve body is formed with a mounting hole, and the valve body is sleeved on the transmission rod through the mounting hole.

[0015] By providing a mounting hole on the valve body, the valve body is connected to the transmission rod through the mounting hole. The connection method is firm, the installation process is simple, and it is not easy to loosen during use.

[0016] In some embodiments, the outer periphery of the valve body can abut against the inner wall surface of the powder injection cylinder, and the size of the valve body is smaller than the size of the inner cavity of the powder storage cylinder.

[0017] By providing that the outer periphery of the valve body can abut against the inner wall surface of the powder injection cylinder and the size of the valve body is smaller than the size of the inner cavity of the powder storage cylinder, when the valve body is driven by the transmission rod to rise into the powder storage cylinder, the powder can flow from the gap between the valve body and the powder storage cylinder into the powder injection cylinder to complete the replenishment of the powder. The valve body can also be driven by the transmission rod to descend to be hermetically connected to the inner wall surface of the powder injection cylinder to isolate the powder injection cylinder and the powder storage cylinder. At this time, the powder in the powder injection cylinder flows out from the powder outlet.

[0018] In some embodiments, the valve body is a conical valve, the valve body is formed with a conical surface, and the conical surface slopes downward from the transmission rod towards the side wall of the powder injection cylinder.

[0019] By setting the valve body as a valve body with a conical surface, it is convenient for the powder to flow into the powder injection cylinder from the gap, and the rotation and axial movement of the conical surface can more effectively drive the flow of the powder.

[0020] In some embodiments, the powder injection device further includes a plugging member. The powder injection cylinder is formed with a powder outlet, and the transmission rod is connected to the plugging member to control the plugging member to close or open the powder outlet.

[0021] By providing that the plugging member is connected to the transmission rod, during the axial movement of the transmission rod, one of the plugging member and the valve body is in an open state, while the other is in a closed state, which can reduce the risk of the powder outlet being blocked due to a large amount of powder pouring into the powder outlet.

[0022] In some embodiments, the plugging member includes a powder injection rod and a limiting ball. The two ends of the powder injection rod are respectively connected to the transmission rod and the limiting ball, and the limiting ball is used to close or open the powder outlet.

[0023] By setting the plugging member to include a powder injection rod and a limiting ball, the powder injection rod plays a connecting role, and its size is designed to be small enough to move in the powder outlet, so that the limiting ball can block or open the powder outlet under the drive of the transmission rod to realize the control of the powder discharge.

[0024] In some embodiments, a restricting member is provided at the powder outlet, the restricting member forms a limiting hole, and the powder injection rod is telescopically installed in the limiting hole.

[0025] By providing a restricting member at the powder outlet, it is used to limit the radial movement of the powder injection rod, so that the powder injection rod always maintains synchronous axial movement with the transmission rod during the movement process, reducing the possibility of radial deviation during the movement process.

[0026] In some embodiments, one end of the powder injection rod is detachably connected to the transmission rod, and the other end of the powder injection rod is provided with a plurality of threads, and a spacing is formed between adjacent two of the threads.

[0027] By providing threads with a spacing on the powder injection rod, precise control of the powder feeding speed and feeding accuracy can be achieved, and the powder injection rod is detachably connected to the transmission rod, which is convenient to replace the powder injection rod with different spacings according to the accuracy requirements to achieve different accuracy feeding adjustments, and is applicable to powder injection requirements under different accuracies.

[0028] In some embodiments, the powder injection device further includes a stirring blade, the stirring blade is in transmission connection with the transmission rod, and the stirring blade is arranged in the powder injection cylinder.

[0029] By providing a stirring blade in the powder injection cylinder, the rotation and axial movement of the transmission rod drive the stirring blade to move, which can stir the powder and reduce the possibility of powder sticking to the wall or blocking the holes.

[0030] In some embodiments, the powder injection device further includes a cover body, the cover body covers the opening of the powder storage cylinder, and the transmission rod extends out of the cover body.

[0031] By providing a cover body to cover the opening of the powder storage cylinder, the possibility of the powder in the powder storage cylinder being polluted by the external environment or getting damp can be reduced.

[0032] In some embodiments, a powder adding port is formed on the cover body.

[0033] By providing a powder adding port on the cover body, the feeding of the powder storage cylinder can be realized without opening the cover body, which simplifies the operation and improves the feeding efficiency.

[0034] In some embodiments, a limiting boss is provided on the transmission rod, and the limiting boss is used to abut against the cover body.

[0035] By providing a limiting boss on the transmission rod, the axial movement of the transmission rod is restricted by the abutment of the cover body against the limiting boss, which can reduce the risk of damage to the components of the powder injection device caused by excessive movement of the transmission rod.

[0036] In some embodiments, the limiting boss includes a first boss and a second boss. The first boss is used to abut against the bottom of the cover body, an upper limiting member is arranged on the top of the cover body, and the second boss is used to abut against the upper limiting member.

[0037] By providing the first boss and the second boss, they can respectively abut against the cover body or the upper limiting member arranged on the cover body from two positions, realizing the limiting effect on the axial moving distance of the transmission rod and preventing the transmission rod from sliding out of the cover body at the same time.

[0038] In some embodiments, the powder injection device further includes an elastic member. The elastic member is sleeved on the transmission rod. One end of the elastic member is used to abut against the second boss, and a lower limiting member is also arranged in the cover body. The other end of the elastic member is used to abut against the lower limiting member.

[0039] The elastic member can be a spring piece, which can play a buffering role. Moreover, when the transmission rod moves axially downward, the spring piece is compressed to store energy, and the energy released during the return process can make the transmission rod quickly return to the initial position.

[0040] By providing the elastic member, and the two ends of the elastic member respectively abut against the lower limiting member and the second boss, on the one hand, it can play a buffering role, and on the other hand, it is beneficial to the quick return of the transmission rod.

[0041] In some embodiments, both the powder injection cylinder and the powder storage cylinder are conductive cylinders.

[0042] By making both the powder injection cylinder and the powder storage cylinder made of conductive materials, the static electricity between the powder particles and the cylinder body can be reduced, and the adhesion between the powder and the inner wall surface of the cylinder body can be reduced.

[0043] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically illustrates the specific embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0045] Figure 1 is a schematic three-dimensional structure diagram of the powder injection device according to some embodiments of the present application;

[0046] Figure 2 is a schematic cross-sectional structure diagram of the powder injection device according to some embodiments of the present application;

[0047] Figure 3 This is a schematic diagram of a partial structure of the powder injection device according to some embodiments of the present application;

[0048] Figure 4 This is a schematic diagram of another partial structure of the powder injection device according to some embodiments of the present application;

[0049] Figure 5 is Figure 4 a schematic diagram of the structure from another perspective;

[0050] Figure 6 This is a schematic diagram of a partial three - dimensional structure of the powder injection device according to some embodiments of the present application;

[0051] Figure 7 is Figure 6 a schematic diagram of a sectional structure;

[0052] Figure 8 This is a schematic diagram of a three - dimensional structure of a perspective of the powder injection cylinder of the powder injection device according to some embodiments of the present application;

[0053] Figure 9 This is a schematic diagram of a three - dimensional structure of another perspective of the powder injection cylinder of the powder injection device according to some embodiments of the present application.

[0054] The reference numerals in the specific embodiments are as follows:

[0055] 100, powder injection device;

[0056] 10, powder storage cylinder; 20, powder injection cylinder; 21, powder outlet; 30, valve body; 31, conical surface; 40, transmission rod; 41, first boss; 42, second boss; 50, plugging member; 51, powder injection rod; 52, limiting ball; 60, limiting member; 70, stirring blade; 80, cover body; 81, upper limiting member; 82, lower limiting member; 83, chamber; 84, elastic member. Specific Embodiments

[0057] Hereinafter, embodiments of the technical solution of the present application will be described in detail with reference to the drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above - mentioned drawings are intended to cover non - exclusive inclusion.

[0059] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is more than two, unless otherwise specifically and clearly defined.

[0060] Reference to "embodiment" in this context means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase does not necessarily refer to the same embodiment when it appears in various places in the specification, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0061] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this text generally represents an "or" relationship between the associated objects before and after.

[0062] In the description of the embodiments of the present application, the term "a plurality of" means more than two (including two). Similarly, "a plurality of groups" means more than two groups (including two groups), and "a plurality of pieces" means more than two pieces (including two pieces).

[0063] In the description of the embodiments of the present application, technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0064] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0065] At present, from the perspective of the development of the market situation, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric transportation such as electric bicycles, electric motorcycles, and electric vehicles, as well as in many fields such as military equipment and aerospace. With the continuous expansion of the application fields of power batteries, the market demand is also continuously increasing.

[0066] With the increasing demand for power batteries, the production of power batteries is also increasing. As the "blood" of power batteries, electrolyte is an indispensable part of the battery material composition as a transmission carrier of Li+ (lithium ions) between the positive and negative electrodes. The electrolyte is generally prepared by corresponding metal salts (lithium salts, sodium salts, calcium salts, magnesium salts, etc.), solvents, solid additives, and liquid additives under certain conditions in a corresponding proportion. In this process, using an automated device for liquid injection and powder addition is currently the most efficient and accurate method, which will greatly improve the efficiency and accuracy of the configuration process and reduce labor costs. However, the currently used powder injection devices often have the phenomenon of powder blockage. After careful research, the applicant found that due to the need to control the powder output, the powder outlet is generally designed to be small, and a large amount of powder in the accommodation cavity of the powder injection device rushes towards the powder outlet, easily causing blockage of the powder outlet.

[0067] Therefore, the present application provides a powder injection device.

[0068] Referring to Figure 1 and Figure 2 , according to some embodiments of the present application, the present application provides a powder injection device 100, including a powder storage cylinder 10 and a powder injection cylinder 20, and a valve body 30 that can be opened and closed is provided between the powder storage cylinder 10 and the powder injection cylinder 20.

[0069] The powder injection device 100 is used for liquid injection or powder addition in an automated manner. Different from the conventional design, in this embodiment, the powder injection device 100 is divided into two parts. The powder storage cylinder 10 is used to store powder, and the powder injection cylinder 20 is formed with a powder outlet 21. The powder flows out from the powder outlet 21 after entering the powder injection cylinder 20 from the powder storage cylinder 10. The powder storage cylinder 10 and the powder injection cylinder 20 are controlled to be opened and closed by the valve body 30. When the valve body 30 is closed, the powder storage cylinder 10 and the powder injection cylinder 20 are separated from each other, and the powder in the powder injection cylinder 20 can flow out through the powder outlet 21. At this time, since the powder storage cylinder 10 is separated, only the powder in the powder injection cylinder 20 flows out through the powder outlet 21. Therefore, the risk of blockage of the powder outlet 21 caused by a large amount of powder rushing into the powder outlet 21 can be reduced. When the valve body 30 is opened, the powder in the powder storage cylinder 10 can flow into the powder injection cylinder 20 to supplement the powder flowing out of the powder injection cylinder 20, ensuring the continuity of powder filling.

[0070] By separately providing the powder injection device 100 with a powder storage cylinder 10 and a powder injection cylinder 20, separating the powder storage cylinder 10 and the powder injection cylinder 20 by a valve body 30, and designing the valve body 30 in an openable and closable form, replenishing the powder in the powder injection cylinder 20 through the powder storage cylinder 10 and discharging the powder through the powder outlet 21 of the powder injection cylinder 20, the risk of blockage of the powder outlet 21 caused by a large amount of powder surging into the powder outlet 21 can be reduced.

[0071] Referring to Figure 2 and Figure 3 , in some embodiments, the powder injection device 100 further includes a transmission rod 40, and the transmission rod 40 is connected to the valve body 30 to control the opening and closing of the valve body 30.

[0072] The transmission rod 40 is a rod body, for example, it can be a long rod. The transmission rod 40 extends into the powder injection device 100 and is connected to the valve body 30. In this way, an external operator or an external driving device (such as a driving motor) can control the movement of the valve body 30 in the powder injection device 100 by controlling the transmission rod 40 to open or close the valve body 30. When the valve body 30 is opened, it corresponds to the communication between the powder storage cylinder 10 and the powder injection cylinder 20, and the powder storage cylinder 10 replenishes the powder into the powder injection cylinder 20; when the valve body 30 is closed, it corresponds to the separation of the powder storage cylinder 10 and the powder injection cylinder 20, and the powder in the powder injection cylinder 20 flows out through the powder outlet 21.

[0073] By arranging the transmission rod 40 to extend into the accommodation cavity of the powder injection device 100 and be connected to the valve body 30, the opening and closing of the valve body 30 can be controlled externally, improving the convenience and safety of operation.

[0074] Referring to Figure 2 and Figure 3 , in some embodiments, the transmission rod 40 is used to drive the valve body 30 to axially move along the central axis of the powder storage cylinder 10 to control the opening and closing of the valve body 30.

[0075] Regarding the shapes of the powder storage cylinder 10 and the powder injection cylinder 20, they can be cylindrical, polygonal or other shapes. Taking the powder storage cylinder 10 and the powder injection cylinder 20 as cylindrical examples, the powder storage cylinder 10 is located above the powder injection cylinder 20. When the valve body 30 is opened, the powder in the powder storage cylinder 10 will flow into the powder injection cylinder 20 along the gap between the powder storage cylinder 10 and the valve body 30 under the action of gravity. At this time, the transmission rod 40 can also be vertically arranged. The transmission rod 40 can drive the valve body 30 to move vertically upward along the central axis of the powder storage cylinder 10, corresponding to the state when the valve body 30 is opened; the transmission rod 40 can also drive the valve body 30 to move downward, corresponding to the state when the valve body 30 is closed.

[0076] By the vertical movement of the transmission rod 40, the opening and closing of the valve body 30 can be controlled. The operation is simple and does not require complex equipment driving, reducing the manufacturing cost of the powder injection device 100.

[0077] In some embodiments, the transmission rod 40 is connected to the valve body 30 to control the rotation of the valve body 30.

[0078] The transmission rod 40 can not only drive the valve body 30 to move axially together with it on the central axis of the powder injection cylinder 20 to open or close the valve body 30, but also drive the valve body 30 to rotate together. The rotation and vertical movement can be controlled step by step. Since both the powder injection cylinder 20 and the powder storage cylinder 10 contain powdery materials, factors such as friction and static electricity exist between the powders, and adverse phenomena such as "rat holes", "bridging", "layering" and "caking" are likely to occur. By setting that the valve body 30 can rotate and move axially under the drive of the transmission rod 40, the frictional force and electrostatic adsorption force between the powder and the inner wall surfaces of the powder injection cylinder 20 and the powder storage cylinder 10, as well as the frictional force and static electricity between the powders, can be broken, so that the powder can fall from the powder storage cylinder 10 into the powder injection cylinder 20, reducing the occurrence of powder sticking to the wall or non-dropping of materials. The specific rotation speed can be set at 200 r / min - 1000 r / min.

[0079] By setting the transmission rod 40 to drive the valve body 30 to rotate, the transmission rod 40 can not only drive the valve body 30 to rotate, but also drive the valve body 30 to move axially, thereby agitating the powder in the powder injection device 100 and reducing the possibility of adverse conditions of the powder.

[0080] Refer to Figure 2 and Figure 3 , in some embodiments, the valve body 30 is formed with a mounting hole, and the valve body 30 is sleeved on the transmission rod 40 through the mounting hole.

[0081] Regarding the specific connection method between the valve body 30 and the transmission rod 40, it can be a direct connection between the valve body 30 and the transmission rod 40, such as welding or threaded connection. It can also be to form a mounting hole on the valve body 30. The mounting hole is a through hole, and the transmission rod 40 passes through the mounting hole and is in a tight fit, so that the movement synchronization between the transmission rod 40 and the valve body 30 can be achieved. One end of the transmission rod 40 passes through the mounting hole and extends into the powder injection cylinder 20, and the other end passes through the cover body 80 of the powder injection device 100 and is connected to an external power device, and the power device can be a driving motor.

[0082] By providing a mounting hole on the valve body 30, the valve body 30 is connected to the transmission rod 40 through the mounting hole. The connection method is firm, the installation process is simple, and it is not easy to loosen during use.

[0083] Refer to Figure 2 and Figure 3 , in some embodiments, the outer periphery of the valve body 30 can be in contact with the inner wall surface of the powder injection cylinder 20, and the size of the valve body 30 is smaller than the size of the inner cavity of the powder storage cylinder 10.

[0084] The outer periphery of the valve body 30 refers to the outer edge of the valve body 30. The outer periphery of the valve body 30 can abut against the inner wall of the powder injection barrel 20, which means that when the valve body 30 is lowered to a position close to the powder injection barrel 20, the outer periphery of the valve body 30 and the inner wall of the powder injection barrel 20 abut against each other to form a sealed connection. The sealing here mainly refers to the absence of a gap between the valve body 30 and the inner wall of the powder injection barrel 20, and the powder cannot flow from the powder storage barrel 10 to the powder injection barrel 20. The powder injection barrel 20 and the powder storage barrel 10 are divided into two mutually isolated barrels, and the corresponding valve body 30 is in a closed state. When the transmission rod 40 drives the valve body 30 to rise, the valve body 30 will move into the powder storage barrel 10. At this time, the size of the valve body 30 is set to be smaller than the size of the inner cavity of the powder storage barrel 10, so that a gap is formed between the edge of the valve body 30 and the inner wall of the powder storage barrel 10, so that the powder can flow from the powder storage barrel 10 into the powder injection barrel 20 through the gap between the two, and the powder in the powder injection barrel 20 is replenished. In a specific embodiment, the outer circumference of the valve body 30 is a circle, the powder injection barrel 20 is a cylindrical barrel, the diameter of the circle of the outer circumference of the valve body 30 is smaller than the diameter of the inner circle of the powder storage barrel 10, and the diameter of the circle of the outer circumference of the valve body 30 is substantially equal to the diameter of the inner circle of the powder injection barrel 20. And, obviously, the diameter of the inner circle of the powder injection barrel 20 is smaller than the diameter of the inner circle of the powder storage barrel 10. At the same time, in order to facilitate the powder in the powder injection barrel 20 to flow to the powder outlet 21, the powder injection barrel 20 can also be set to be conical.

[0085] By setting the outer periphery of the valve body 30 to be in contact with the inner wall surface of the powder injection barrel 20, and the size of the valve body 30 is smaller than the size of the inner circle of the powder storage barrel 10, when the valve body 30 is driven by the transmission rod 40 to rise into the powder storage barrel 10, the powder can flow into the powder injection barrel 20 from the gap between the valve body 30 and the powder storage barrel 10, and the powder is replenished. The valve body 30 can also be driven by the transmission rod 40 to descend to the inner wall surface of the powder injection barrel 20 to seal and connect, so as to separate the powder injection barrel 20 from the powder storage barrel 10, and the powder in the powder injection barrel 20 flows out from the powder outlet 21.

[0086] Reference Figure 3 and Figure 4 In some embodiments, the valve body 30 is a conical valve, and a conical surface 31 is formed on the valve body 30 , and the conical surface 31 is inclined downward from the transmission rod 40 toward the side wall of the powder injection cylinder 20 .

[0087] The conical surface 31 of the valve body 30 is arranged on the side of the valve body 30 facing away from the powder injection cylinder 20, and the conical surface 31 is gradually inclined downward from the center of the conical surface 31 to the outer edge, that is, the inclined shape is high in the middle and low on both sides, and the center of the transmission rod 40 is actually the apex of the conical surface 31. Since the gap is generated between the outer edge of the valve body 30 and the inner side wall of the powder storage cylinder 10 during the upward movement of the valve body 30, the setting of the conical surface 31 can ensure that the powder slides down the conical surface 31 to the gap and falls into the powder injection cylinder 20 from the gap.

[0088] By setting the valve body 30 as a valve body 30 with a conical surface, it is convenient for the powder to flow from the gap into the powder injection cylinder 20, and the rotation and axial movement of the conical surface can more effectively drive the flow of the powder.

[0089] Referring to Figure 2 , Figure 3 and Figure 7 , in some embodiments, the powder injection device 100 further includes a plugging member 50. The powder injection cylinder 20 is formed with a powder outlet 21, and the transmission rod 40 is connected to the plugging member 50 to control the plugging member 50 to close or open the powder outlet 21.

[0090] The plugging member 50 is used to close or open the powder outlet 21. When the plugging member 50 closes the powder outlet 21, the powder cannot flow out from the powder outlet 21; when the plugging member 50 opens the plugging opening, the powder can flow out from the powder outlet 21. Specifically, the plugging member 50 is connected to the transmission rod 40 and is driven by the transmission rod 40 to move. It should be noted that during the axial movement of the transmission rod 40, one of the plugging member 50 and the valve body 30 is in an open state, while the other is in a closed state. Specifically, when the transmission rod 40 moves upward along the axis, the plugging member 50 moves to the powder outlet 21 to block the powder outlet 21. At the same time, the valve body 30 will move upward with the transmission rod 40, and the powder in the powder storage cylinder 10 flows into the powder injection cylinder 20 from the gap between the valve body 30 and the inner wall surface of the powder storage cylinder 10. Since the powder outlet 21 is blocked by the plugging member 50 at this time, the risk of the powder outlet 21 being blocked due to a large amount of powder surging to the powder outlet 21 can be reduced. When the transmission rod 40 moves downward along the axis, the plugging member 50 moves to a position away from the powder outlet 21, corresponding to the plugging member 50 opening the powder outlet 21. At this time, the powder in the powder injection cylinder 20 can flow out through the powder outlet 21; at the same time, the valve body 30 will move to a position close to the powder injection cylinder 20, and the outer periphery of the valve body 30 is in sealing connection with the inner wall surface of the powder injection cylinder 20, and there is no gap between them, and the powder cannot flow from the powder storage cylinder 10 into the powder injection cylinder 20, which can reduce the risk of the powder outlet 21 being blocked due to a large amount of powder surging into the powder outlet 21.

[0091] By setting the plugging member 50 to be connected to the transmission rod 40, during the axial movement of the transmission rod 40, one of the plugging member 50 and the valve body 30 is in an open state, while the other is in a closed state, which can reduce the risk of the powder outlet 21 being blocked due to a large amount of powder surging into the powder outlet 21.

[0092] Referring to Figures 3 to 5 any one of the figures in, in some embodiments, the plugging member 50 includes a powder injection rod 51 and a limit ball 52. The two ends of the powder injection rod 51 are respectively connected to the transmission rod 40 and the limit ball 52, and the limit ball 52 is used to close or open the powder outlet 21.

[0093] The plugging member 50 can at least include two parts. The powder injection rod 51 is a rod body, and the powder injection rod 51 can telescopically move within the powder outlet 21. The size of the limiting ball 52 is larger than that of the powder injection rod 51, and the size of the limiting ball 52 is larger than the size of the powder outlet 21. In this way, when the limiting ball 52 moves close to or abuts against the powder outlet 21, the powder outlet 21 can be blocked to prevent the powder from flowing out of the powder outlet 21. Moreover, the other end of the powder injection rod 51 is connected to the transmission rod 40, so that the effect of driving the limiting ball 52 to move through the transmission rod 40 is achieved.

[0094] By setting the plugging member 50 to include the powder injection rod 51 and the limiting ball 52, the powder injection rod 51 plays a connecting role, and its size is designed to be smaller so that it can move within the powder outlet 21. Under the drive of the transmission rod 40, the limiting ball 52 can block or open the powder outlet 21, realizing the control of the powder discharge.

[0095] Refer to Figures 7 to 9 , in some embodiments, a restricting member 60 is provided at the powder outlet 21. The restricting member 60 forms a limiting hole, and the powder injection rod 51 is telescopically installed in the limiting hole.

[0096] The limiting member here can be annular, with a limiting hole provided in the middle. The size of the limiting hole is slightly larger than that of the powder injection rod 51, which will not affect the sliding of the powder injection rod 51 within the limiting hole. At the same time, it is only slightly larger, so that it can play a role in restricting the radial movement of the powder injection rod 51, reducing the possibility of the powder injection rod 51 deviating during the movement, and enabling the powder injection rod 51 to move axially. Of course, in other embodiments, the restricting member 60 can include at least two parts of annular components. The annular components are part of a ring, and at least two annular components are arranged annularly to form a limiting hole.

[0097] By providing the restricting member 60 at the powder outlet 21 to play a role in restricting the radial movement of the powder injection rod 51, the powder injection rod 51 can always maintain synchronous axial movement with the transmission rod 40 during the movement, reducing the possibility of the powder injection rod 51 deviating radially during the movement.

[0098] In some embodiments, one end of the powder injection rod 51 is detachably connected to the transmission rod 40, and the other end of the powder injection rod 51 is provided with a plurality of threads, and a spacing is formed between adjacent two threads.

[0099] Regarding the connection method between the powder injection rod 51 and the transmission rod 40, there can be multiple ways, which can be a fixed connection such as welding, or can be connected by screws or threaded connection. The detachable connection method is convenient for removing the powder injection rod 51 from the transmission rod 40. The other end of the powder injection rod 51 is provided with a plurality of threads. Specifically, the threaded part at the other end of the powder injection rod 51 extends into the powder injection hole. It should be noted that the threads here are not used to achieve threaded connection, but to enable the powder to flow out from the powder outlet 21 through the spacing between the threads. Since the transmission rod 40 can drive the powder injection rod 51 to rotate, the powder entering the spacing will flow out through the powder outlet 21 as the powder injection rod 51 rotates. Therefore, the speed and accuracy of the powder output can be controlled by controlling the spacing of the threads. Specifically, if the thread spacing is large, a larger amount of powder can be accommodated at one time, then the powder output speed will be higher, and the accuracy control will be relatively lower; if the thread spacing is small, the amount of powder that can be accommodated at one time is small, the powder output speed will be relatively low, and the accuracy control will be relatively higher. The powder injection device 100 of this embodiment is applicable to powders with particle sizes in the range of several micrometers to several millimeters, and the powder injection accuracy can reach 0.5 mg level. At the same time, the powder injection rod 51 can be flexibly replaced according to the accuracy, especially applicable to metal salt and solid additive powders with median particle sizes between 10 micrometers and 200 micrometers.

[0100] By setting threads with spacing on the powder injection rod 51, the accurate control of the powder feeding speed and powder feeding accuracy is realized, and the powder injection rod 51 and the transmission rod 40 are detachably connected, which is convenient to replace the powder injection rod 51 with different spacings according to the accuracy requirements to realize different accuracy powder feeding adjustments, and is applicable to the powder injection requirements under different accuracies.

[0101] Refer to Figure 2 and Figure 4 , in some embodiments, the powder injection device 100 further includes a stirring blade 70, the stirring blade 70 is connected to the transmission rod 40, and the stirring blade 70 is arranged in the powder injection cylinder 20.

[0102] The stirring blade 70 is a blade installed on the transmission rod 40. The number of the stirring blades 70 can be multiple. The multiple stirring blades 70 are arranged at intervals around the outer circumference of the transmission rod 40. The connection method between the stirring blade 70 and the transmission rod 40 is not limited to welding, and can also be key and stop bolt connection, bolt clamping and stop screw fixation, etc. The stirring blade 70 is used to stir the powder in the powder injection cylinder 20 when the transmission rod 40 rotates, reducing the possibility of powder sticking to the wall or blocking the hole, and being able to better disperse the powder in the powder injection cylinder 20.

[0103] By arranging the stirring blade 70 in the powder injection cylinder 20, the powder can be stirred by the rotation and axial movement of the transmission rod 40 driving the stirring blade 70, reducing the possibility of powder sticking to the wall or blocking the hole.

[0104] Refer toFigure 1 and Figure 6 In some embodiments, the powder injection device 100 further includes a cover body 80 which is disposed on the opening of the powder storage cylinder 10, and the transmission rod 40 extends out of the cover body 80.

[0105] The cover body 80 can be a cover plate. The opening of the powder storage cylinder 10 refers to the upward opening of the powder storage cylinder 10. When adding materials, the cover body 80 can be opened. When the material addition is completed, the cover body 80 is covered on the opening to prevent external environmental pollution or powder from getting damp. A part of the transmission rod 40 extends out of the cover body 80 and can be connected to an external driving device, such as a driving motor.

[0106] By providing the cover body 80 to cover the opening of the powder storage cylinder 10, the possibility of the powder in the powder storage cylinder 10 being polluted by the external environment or getting damp can be reduced.

[0107] In some embodiments, a powder adding port is formed on the cover body 80.

[0108] The powder adding port can be an opening provided on the cover body 80, so that the powder storage cylinder 10 can be directly fed without opening the cover body 80. Compared with the need to open the entire cover body 80, it is more convenient to add materials through the powder adding port 21 provided on the cover body 80. In a specific embodiment, a sealing plate for covering the powder adding port can be provided, and the sealing plate can be hingedly installed at the powder adding port.

[0109] By providing the powder adding port on the cover body 80, the feeding of the powder storage cylinder 10 can be realized without opening the cover body 80, which simplifies the operation and improves the feeding efficiency.

[0110] Referring to Figure 2 In some embodiments, a limiting boss is provided on the transmission rod 40, and the limiting boss is used to abut against the cover body 80.

[0111] The limiting boss can be a protrusion formed on the transmission rod 40 or a component connected to the transmission rod 40. During the axial movement of the transmission rod 40, the abutment of the limiting boss against the cover body 80 prevents the transmission rod 40 from continuing to move, realizing the axial movement limit of the transmission rod 40 and preventing the transmission rod 40 from moving beyond the limit. The limiting boss here can be one, or two or more, which is specifically set according to the actual situation.

[0112] By providing the limiting boss on the transmission rod 40 and realizing the limitation of the axial movement of the transmission rod 40 through the abutment of the cover body 80 against the limiting boss, the risk of damage to the components of the powder injection device 100 or the detachment of the transmission rod 40 caused by the transmission rod 40 moving beyond the limit can be reduced.

[0113] Referring to Figure 4 and Figure 5In some embodiments, the limiting boss includes a first boss 41 and a second boss 42 , the first boss 41 is used to abut against the bottom of the cover body 80 , an upper limit positioning member 81 is provided on the top of the cover body 80 , and the second boss 42 is used to abut against the upper limit positioning member 81 .

[0114] A chamber 83 is formed in the cover body 80, and the cover body 80 includes a top and a bottom arranged opposite to the top. The first boss 41 is located below the second boss 42. The first boss 41 is used to abut against the side of the bottom of the cover body 80 away from the chamber 83. In this way, when the transmission rod 40 moves axially upward, the first boss 41 hits the bottom of the cover body 80 and stops moving, limiting the upward displacement of the transmission rod 40. Similarly, an upper limit member 81 is provided on the top of the cover body 80, and the upper limit member 81 can abut against the second boss 42 to limit the upward movement of the transmission rod 40, so as to prevent the transmission rod 40 from sliding out. Of course, the first boss 41 can be arranged in the chamber 83 to limit the downward movement of the transmission rod 40. The second boss 42 can be a snap ring, which is detachably connected to the transmission rod 40, so as to facilitate the installation of the transmission rod 40.

[0115] By providing the first boss 41 and the second boss 42 , they can respectively abut against the cover body 80 or the upper limit member 81 provided on the cover body 80 from two positions to achieve the limiting effect on the axial movement distance of the transmission rod 40 and prevent the transmission rod 40 from slipping out of the cover body 80 .

[0116] In some embodiments, the powder injection device 100 also includes an elastic member 84, which is sleeved on the transmission rod 40, and one end of the elastic member 84 is used to abut against the second boss 42. A lower limit member 82 is also provided in the cover body 80, and the other end of the elastic member 84 is used to abut against the lower limit member 82.

[0117] Reference Figure 2 and Figure 7 The elastic member 84 may be a spring sheet, which can play a buffering role. Specifically, one end of the elastic member 84 abuts against the bottom surface of the second boss 42, and the other end of the elastic member 84 abuts against the top surface of the lower stop member 82. When the transmission rod moves downward in the axial direction, the spring sheet is compressed to store energy, and releases energy during the return process to enable the transmission rod 40 to quickly return to the initial position.

[0118] By providing the elastic member 84 , and having both ends of the elastic member 84 abutting against the lower limit member 82 and the second boss 42 respectively, a buffering effect can be achieved and rapid return of the transmission rod 40 can be facilitated.

[0119] In some embodiments, both the powder injection cylinder 20 and the powder storage cylinder 10 are conductive cylinders.

[0120] The conductive cylinders mentioned here refer to that both the powder injection cylinder 20 and the powder storage cylinder 10 can be made of conductive materials, such as stainless steel, magnesium alloy, etc., which can eliminate static electricity or conduct electricity, so as to reduce the static adsorption between the particles and the cylinder wall. Specifically, referring to Figure 8 and Figure 9 , the powder injection cylinder 20 is a conical cylinder, and the funnel angle of the powder injection cylinder 20 is greater than the maximum repose angle of the powder material. This can ensure that the powder can smoothly gather at the powder outlet 21 in the powder injection cylinder 20 and reduce the occurrence of powder clogging at the powder outlet 21. The powder injection cylinder 20 and the powder storage cylinder 10 can be connected by flanges through threads.

[0121] By making both the powder injection cylinder 20 and the powder storage cylinder 10 of conductive materials, the static electricity between the powder particles and the cylinder wall can be reduced, and the adhesion between the powder and the inner wall of the cylinder can be reduced.

[0122] According to some embodiments of the present application, the present application provides a powder injection device 100, which includes a powder storage cylinder 10, a powder injection cylinder 20, a transmission rod 40, a cover body 80, a plugging member 50 and an elastic member 84. Both the powder storage cylinder 10 and the powder injection cylinder 20 are made of conductive materials. A switchable conical valve is provided between the powder storage cylinder 10 and the powder injection cylinder 20. The valve body 30 is formed with an installation hole, and the valve body 30 is sleeved on the transmission rod 40 through the installation hole. The transmission rod 40 is used to drive the valve body 30 to rotate and move axially. The powder injection cylinder 20 is formed with a powder outlet 21. The plugging member 50 includes a powder injection rod 51 and a limiting ball 52. The two ends of the powder injection rod 51 are respectively connected to the transmission rod 40 and the limiting ball 52. The limiting ball 52 is used to close or open the powder outlet 21; a limiting member 60 is provided at the powder outlet 21. The limiting member 60 is formed with a limiting hole. The powder injection rod 51 is telescopically installed in the limiting hole. One end of the powder injection rod 51 is detachably connected to the transmission rod 40. The other end of the powder injection rod 51 is provided with a plurality of threads, and a spacing is formed between adjacent two threads. The transmission rod 40 is provided with a first boss 41 and a second boss 42. The first boss 41 is used to abut against the bottom of the cover body 80. An upper limiting member 81 is provided at the top of the cover body 80. The second boss 42 is used to abut against the upper limiting member 81. The elastic member 84 is sleeved on the transmission rod 40. One end of the elastic member 84 is used to abut against the second boss 42. A lower limiting member 82 is further provided in the cover body 80. The other end of the elastic member 84 is used to abut against the lower limiting member 82. This embodiment can accurately inject the powder into the corresponding dispensing bottle through the powder injection rod 51, ensuring accurate and efficient powder injection.

[0123] To demonstrate the technical effects of the present invention, powder injection is carried out using powder injectors with different design structures below to evaluate the influence of different design structures on the powder injection process. Specifically, it is divided into the following five design structures, which are replaced by five embodiments, namely Embodiment 1, Embodiment 2, Embodiment 3, Embodiment 4, and Embodiment 5. In the structural design of Embodiment 2, the valve body 30 is replaced with a limiting device compared to Embodiment 1; the structural design of Embodiment 3 removes the limiting device in Embodiment 2; the structural design of Embodiment 4 removes the stirring device in Embodiment 3; the structural design of Embodiment 5 removes the powder injection rod 51 and retains the original stirring device. The above 5 designs are applied to evaluate the powder injection process of metal salts and solid additives required for electrolyte preparation. The main evaluation items include whether phenomena such as "rat holes" and "bridging" occur in the powder, whether the powder falls into the powder injection structure orderly, whether the powder blocks at the powder outlet 21, whether the equipment injects powder accurately, and whether the equipment can inject powder. The specific implementation situations and results are shown in Table 1:

[0124] Table 1

[0125]

[0126] As can be seen from Table 1, during the operation of the equipment in Embodiment 1, that is, in the embodiment of the present application, the transmission rod 40 can be driven to move by an external motor. Here, the movement includes rotation and axial movement. Since the rotation and axial movement of the transmission rod 40 drive the valve body 30 to move synchronously, the forces between powders and between the powder and the barrel wall are broken, and phenomena such as "rat holes" and "bridging" are eliminated. At the same time, during the axial movement of the valve body 30, the powder falls into the powder injection barrel 20 along the gap between the valve body 30 and the barrel body. When the transmission rod 40 stops moving, the valve body 30 prevents the powder from continuing to fall into the powder injection barrel 20, realizing the orderly falling of the powder. At the same time, when the valve body 30 stops moving, it can serve as a limiting device to fix the position of the transmission rod 40, enabling the powder to be accurately injected from the powder outlet 21 at the bottom of the powder injection barrel 20 when the transmission rod 40 drives the powder injection rod 51 to inject powder later. After the powder falls into the powder injection barrel 20, the external motor drives the transmission rod 40 to rotate, driving the inclined blade type stirring blade 70 to rotate, better dispersing the powder in the powder injection barrel 20. The motor drives the transmission rod 40 to move axially, and the powder is accurately injected into the corresponding preparation bottle through the powder injection rod 51, ensuring accurate and efficient powder injection.

[0127] Example 2 During the operation of the device, the motor drives the transmission rod 40 to rotate and move axially. Due to the lack of the valve body 30, there are electrostatic forces and frictional forces between powders and between powders and the cylinder wall, which easily cause phenomena such as "rat holes" and "bridging", resulting in some powders being unable to fall. The limiting device cannot prevent the powders in the upper powder storage cylinder 10 from falling, causing some powders to quickly fall into the bottom powder injection cylinder 20, and the powders accumulate in the bottom powder injection cylinder 20, and the powders cannot complete the orderly feeding. The limiting device fixes the position of the transmission rod 40. The subsequent powder injection process is the same as that in Example 1. Since the motor drives the transmission rod 40 to rotate and drives the inclined blade mixing blade 70 to rotate, the powders in the conical structure are better dispersed. The motor drives the transmission rod 40 to move axially, and the powders are accurately injected into the corresponding dispensing bottles through the powder injection rod 51.

[0128] Example 3 During the operation of the device, due to the lack of the valve body 30, phenomena such as "rat holes" and "bridging" also occur, resulting in some powders being unable to fall, and the part of the powders that can fall directly falls into the bottom powder injection cylinder 20 and accumulates in the bottom powder injection cylinder 20. During the movement of the transmission rod 40 driven by an external motor, the powders can be dispersed in the conical structure. However, due to the absence of the limiting device, during the powder injection process with the motor driving the powder injection rod 51, the powder injection rod 51 deviates from its original position, resulting in the inability to perform powder injection, and further leading to the inability to accurately inject powder during the powder injection process.

[0129] Example 4 During the operation of the device, due to the absence of the valve body 30, phenomena such as "rat holes" and "bridging" occur, resulting in some powders being unable to fall, and the part of the powders that can fall directly falls into the bottom powder injection cylinder 20 and accumulates in the bottom powder injection cylinder 20. Due to the removal of the mixing blade 70, it is difficult to disperse the powders accumulated in the bottom powder injection cylinder 20 well, blocking the powder outlet hole at the bottom of the powder injection cylinder 20 and preventing powder injection. At the same time, the absence of the limiting device causes the powder injection rod 51 to be unable to inject powder, and the powder injection process is blocked.

[0130] Example 5 During the operation of the device, the valve body 30, the limiting device, and the powder injection rod 51 cause phenomena such as "rat holes" and "bridging" in the powders in the cylindrical barrel, resulting in some powders being unable to fall, and the part of the powders that can fall directly falls into the bottom powder injection cylinder 20 and accumulates in the bottom powder injection cylinder 20. Since there is no powder injection rod 51, the powders flow out along the holes in the bottom conical structure, and the accurate injection of the powders cannot be controlled.

[0131] Therefore, adopting Example 1 of the present application can accurately inject the powders into the corresponding dispensing bottles through the powder injection rod 51, ensuring accurate and efficient powder injection.

[0132] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A powder injection device, characterized in that: It includes a powder storage cylinder, a powder injection cylinder and a transmission rod, wherein an openable and closable valve body is arranged between the powder storage cylinder and the powder injection cylinder; the outer periphery of the valve body can abut against the inner wall surface of the powder injection cylinder, and the size of the valve body is smaller than the size of the inner cavity of the powder storage cylinder, and the transmission rod is connected to the valve body to control the opening and closing of the valve body.

2. The powder injection device according to claim 1, characterized in that: The transmission rod is used to drive the valve body to move axially along the central axis of the powder storage cylinder to control the opening and closing of the valve body.

3. The powder injection device according to claim 1, characterized in that: The transmission rod is connected to the valve body to control the rotation of the valve body.

4. The powder injection device according to claim 1, characterized in that: The valve body is formed with a mounting hole, and the valve body is sleeved on the transmission rod through the mounting hole.

5. The powder injection device according to claim 1, characterized in that: The valve body is a conical valve, and a conical surface is formed on the valve body. The conical surface is inclined downward from the transmission rod toward the side wall of the powder injection cylinder.

6. The powder injection device according to claim 1, characterized in that: The powder injection device further comprises a blocking member, the powder injection cylinder is formed with a powder outlet, and the transmission rod is connected to the blocking member to control the blocking member to close or open the powder outlet.

7. The powder injection device according to claim 6, characterized in that: The blocking member comprises a powder injection rod and a limiting ball. The two ends of the powder injection rod are respectively connected to the transmission rod and the limiting ball. The limiting ball is used to close or open the powder outlet.

8. The powder injection device according to claim 7, characterized in that: A limiting member is provided at the powder outlet, the limiting member forms a limiting hole, and the powder injection rod is telescopically installed in the limiting hole.

9. The powder injection device according to claim 7, characterized in that: One end of the powder injection rod is detachably connected to the transmission rod, and the other end of the powder injection rod is provided with a plurality of threads, with a spacing formed between two adjacent threads.

10. The powder injection device according to any one of claims 1 to 9, characterized in that: The powder injection device further comprises a stirring blade, the stirring blade is connected to the transmission rod, and the stirring blade is arranged in the powder injection cylinder.

11. The powder injection device according to any one of claims 1 to 9, characterized in that: The powder injection device further comprises a cover body, which is arranged to cover the opening of the powder storage cylinder, and the transmission rod extends out of the cover body.

12. The powder injection device according to claim 11, characterized in that: A powder adding port is formed on the cover body.

13. The powder injection device according to claim 11, characterized in that: A limiting boss is arranged on the transmission rod, and the limiting boss is used for abutting against the cover body.

14. The powder injection device according to claim 13, characterized in that: The limiting boss includes a first boss and a second boss, the first boss is used to abut against the bottom of the cover body, an upper limit piece is provided on the top of the cover body, and the second boss is used to abut against the upper limit piece.

15. The powder injection device according to claim 14, characterized in that: The powder injection device also includes an elastic member, which is sleeved on the transmission rod, one end of which is used to abut against the second boss, and a lower limit member is also provided in the cover body, and the other end of the elastic member is used to abut against the lower limit member.

16. The powder injection device according to any one of claims 1 to 9, characterized in that: The powder injection cylinder and the powder storage cylinder are both conductive cylinders.

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