A manual liquid injection machine

Abstract

The application provides a manual liquid injection machine, which is characterized in that: the vacuum cavity and the air pressure liquid injection cavity are coaxially arranged along the length direction of the syringe, and the liquid injection needle tube is connected with the vacuum cavity and the air pressure liquid injection cavity at the same time; when the liquid injection needle tube is inserted into the capacitor, a continuous sealed channel is formed for the electrolyte to pass through the air pressure liquid injection cavity, the vacuum cavity and the inner cavity of the capacitor in sequence; the vacuum cavity directly sucks the gas in the capacitor through the liquid injection needle tube, so that no mechanical movement is formed in the whole process after the liquid injection needle tube is inserted into the inner cavity of the capacitor, thereby avoiding the infiltration of external air; the vacuum cavity is arranged close to the end of the liquid injection needle tube, so that the path of the gas in the capacitor is the shortest, the air pressure liquid injection cavity directly injects the electrolyte through air pressure, the electrolyte uniformly infiltrates the inner part of the capacitor, the liquid injection yield and reliability are improved, and the backflow of external air is blocked.

Description

Technical Field

[0001] This application relates to the field of liquid injection machines, and more particularly to a manual liquid injection machine. Background Technology

[0002] As a core energy storage and filtering component in electronic circuits, the performance of capacitors directly depends on the uniform wetting and sealing of the internal electrolyte. In the capacitor manufacturing process, the electrolyte filling step is a critical step determining product yield and reliability. Currently, the industry widely uses electrolyte filling machines to fill capacitors with electrolyte; these devices typically inject the electrolyte into the capacitor's internal cavity using a syringe.

[0003] In existing technologies, a separate vacuum pump is added next to the injection machine, and the connection path of the injection needle is switched via a three-way valve to first evacuate the vacuum before injection; or a dual-chamber syringe is used, with the vacuum chamber and injection chamber arranged side by side, and the connection state of the needle with different chambers is switched via a rotation or translation mechanism. However, when switching valves or chambers, the sealed connection between the injection needle and the capacitor is prone to loosening, allowing external air to easily seep into the chamber, thereby disrupting the vacuum environment inside the capacitor.

[0004] Therefore, there is a need for a manual liquid injection machine that avoids the infiltration of external air when switching valve bodies or chambers. Utility Model Content

[0005] In view of this, it is necessary to provide a manual injection machine to solve the above problems.

[0006] Embodiments of this application provide a manual liquid injection machine, comprising: A placement table with processing positions; The mounting bracket is placed on the placement platform; The syringe is movably mounted on the mounting frame along the direction perpendicular to the table surface. The syringe has a pneumatic injection chamber, a vacuum chamber, and an injection needle tube. The vacuum chamber and the pneumatic injection chamber are arranged sequentially along the length of the syringe. The vacuum chamber is located on the side close to the injection needle tube. The injection needle tube can extend into a capacitor placed on the processing position so that the inner cavity of the capacitor is connected to the vacuum chamber and the pneumatic injection chamber sequentially through the injection needle tube.

[0007] In at least one embodiment of this application, the injection machine further includes: A manual switch is connected to the evacuation channel of the vacuum chamber, and the manual switch can interrupt or connect the connection between the vacuum chamber and the inner cavity of the capacitor.

[0008] In at least one embodiment of this application, the syringe further includes: A storage tank containing an electrolyte formed by compressed air; The first connecting pipe is connected at one end to the liquid storage tank and at the other end to the pneumatic injection chamber.

[0009] In at least one embodiment of this application, the syringe includes a first tube and a second tube, the pneumatic injection chamber is disposed in the first tube, the vacuum chamber is disposed in the second tube, the injection needle tube is disposed on the side of the second tube away from the first tube, and the first tube and the second tube are detachably connected.

[0010] In at least one embodiment of this application, the first tube has an injection port, which is located on the side of the pneumatic injection chamber near the vacuum chamber, and the injection port is connected to the first connecting tube.

[0011] In at least one embodiment of this application, the syringe further includes: Evacuation cylinder; The second connecting pipe is connected at one end to the evacuation cylinder and at the other end to the vacuum chamber. The manual switch is located on the second connecting pipe.

[0012] In at least one embodiment of this application, the injection machine further includes: The driving component is mounted on the mounting bracket; A lifting bracket is mounted on the mounting frame, and the driving component is connected to the lifting bracket so that the driving component drives the lifting bracket to move. A fixed rod is provided, which is disposed opposite to the lifting bracket, and the syringe is clamped between the lifting bracket and the fixed rod.

[0013] In at least one embodiment of this application, the mounting bracket has a mounting portion and a support portion. The mounting portion is disposed on the placement platform, the support portion is disposed on the mounting portion, and the support portion is formed along a direction extending perpendicular to the platform surface of the mounting portion. The lifting bracket is disposed on the support portion.

[0014] In at least one embodiment of this application, it includes: The controller is electrically connected to the drive unit to control the movement of the lifting bracket; The controller alternately controls the connection between the vacuum chamber and the inner cavity of the capacitor, and the connection between the pneumatic injection chamber and the inner cavity of the capacitor.

[0015] In at least one embodiment of this application, the injection machine further includes: A fixing frame is disposed adjacent to the processing position on the placement platform; The fixing frame has a limiting cavity, and the opening of the limiting cavity is set towards the processing position so that the capacitor can extend into the limiting cavity.

[0016] The aforementioned manual electrolyte injection machine arranges the vacuum chamber and the pneumatic injection chamber coaxially along the length of the syringe, with the injection needle simultaneously connecting both chambers. When the injection needle is inserted into the capacitor, a continuous sealed channel is formed through the pneumatic injection chamber and the vacuum chamber to the capacitor's inner cavity. By directly drawing gas from inside the capacitor through the injection needle in the vacuum chamber, no mechanical movement occurs during the insertion of the injection needle, thus preventing the infiltration of external air. Positioning the vacuum chamber near the injection needle minimizes the gas extraction path from the capacitor, ensuring the pneumatic injection chamber directly injects the electrolyte under pressure, guaranteeing uniform electrolyte wetting of the capacitor's interior, improving injection yield and reliability, and preventing backflow of external air. Attached Figure Description

[0017] Figure 1 This is a front view schematic diagram of a manual liquid injection machine according to an embodiment of this application.

[0018] Figure 2 This is a front cross-sectional schematic diagram of a manual liquid injection machine according to an embodiment of this application.

[0019] Figure 3 This is a schematic diagram of a manual liquid injection machine.

[0020] Explanation of main component symbols 100. A manual liquid injection machine; 10. Placement platform; 20. Mounting frame; 21. Mounting part; 22. Support part; 30. Syringe; 31. First tube; 311. Pneumatic injection chamber; 312. Injection port; 32. Second tube; 321. Vacuum chamber; 33. Injection needle tube; 34. Manual switch; 35. Liquid storage tank; 36. First connecting tube; 37. Vacuum cylinder; 38. Second connecting tube; 40. Drive component; 50. Lifting bracket; 60. Fixing rod; 70. Fixing frame; 71. Limiting cavity. Detailed Implementation

[0021] The embodiments of this application will now be described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0022] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or may also have an intervening component. When a component is considered to be "placed" on another component, it can be directly placed on the other component or may also have an intervening component. The terms "top," "bottom," "upper," "lower," "left," "right," "front," "back," and similar expressions used in this article are for illustrative purposes only.

[0023] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0024] according to Figures 1-3 This application provides a manual injection machine 100, including: a placement platform 10, a mounting frame 20 and a syringe 30.

[0025] The placement table 10 has a processing position. A mounting bracket 20 is disposed on the placement table 10. Along a direction perpendicular to the table surface of the placement table 10, the syringe 30 is movably disposed on the mounting bracket 20. The syringe 30 has a pneumatic injection chamber 311, a vacuum chamber 321, and an injection needle tube 33. The vacuum chamber 321 and the pneumatic injection chamber 311 are arranged sequentially along the length of the syringe 30. The vacuum chamber 321 is located near the injection needle tube 33. The injection needle tube 33 can extend into a capacitor placed on the processing position, so that the inner cavity of the capacitor is sequentially connected to the vacuum chamber 321 and the pneumatic injection chamber 311 via the injection needle tube 33.

[0026] Specifically, the placement platform 10 provides a basic support platform for the entire manual injection machine, ensuring the overall stability of the equipment. The processing position is used to locate the capacitor to be injected, keeping the capacitor in a fixed position during injection and preventing the sealing connection between the injection needle 33 and the capacitor from loosening due to positional displacement. The mounting bracket 20 supports the syringe 30, providing a stable mounting base and a moving guide structure for the syringe 30, ensuring that the syringe 30 can move in a direction perpendicular to the surface of the placement platform 10, i.e., move up and down, to achieve docking of the injection needle 33 with the capacitor on the processing position. The syringe 30 is the core component for realizing the vacuuming and injection functions. By realizing the insertion or removal of the injection needle 33 from the capacitor, it ensures the alignment accuracy between the needle and the capacitor during operation.

[0027] Furthermore, the pneumatic injection chamber 311 stores electrolyte, and external air pressure is used as a driving force to push the electrolyte into the vacuum chamber 321. The vacuum chamber 321 directly draws in the gas inside the capacitor through the injection needle tube 33, creating a vacuum environment inside the capacitor, while simultaneously serving as the intermediate channel for the electrolyte to enter the capacitor from the pneumatic injection chamber 311.

[0028] Furthermore, the gas-pressure injection chamber 311, vacuum chamber 321, and injection needle 33 form an axially continuous sealed channel. The gas extraction path from the capacitor to the vacuum chamber 321 is minimized, and the electrolyte injection path is continuous and bend-free from the gas-pressure injection chamber 311 to the vacuum chamber 321 and back to the capacitor. The shortest extraction path improves vacuum efficiency, ensuring that air is fully expelled from the capacitor. The continuous injection path allows the electrolyte to flow evenly into the capacitor under gas pressure, avoiding localized accumulation caused by path bends, improving the uniformity of electrolyte wetting, and ultimately increasing the injection yield and reliability.

[0029] Furthermore, the injection needle 33 is the core channel connecting the inner cavity of the capacitor to the vacuum chamber 321 and the pneumatic injection chamber 311 within the syringe 30. During vacuuming, the gas inside the capacitor enters the vacuum chamber 321 through the injection needle 33; during injection, the electrolyte enters the inner cavity of the capacitor from the pneumatic injection chamber 311 through the vacuum chamber 321 and the injection needle 33. Simultaneously, the contact area between the injection needle 33 and the capacitor forms a seal, preventing external air from entering. Through this sequentially connected structural design, continuous sealing is achieved from vacuuming to injection, eliminating the need to switch channels and preventing any mechanical movement that could damage the seal. This fundamentally prevents external air from seeping into the inner cavity of the capacitor, ensuring a stable vacuum environment and pure electrolyte injection.

[0030] In one specific embodiment, the liquid injection machine further includes a manual switch 34 connected to the air extraction channel of the vacuum chamber 321. The manual switch 34 is capable of interrupting or connecting the connection between the vacuum chamber 321 and the inner cavity of the capacitor.

[0031] Specifically, the manual switch 34 can be any one of a push-button sealing valve, a rotary slide valve, or a slide gate shut-off valve.

[0032] After the injection needle 33 is inserted into the capacitor, during the vacuuming stage, the manual switch 34 is opened, allowing the vacuum chamber 321 and the capacitor's inner cavity to form a continuous sealed channel through the injection needle 33. At this time, the vacuum chamber 321 can directly draw air from the capacitor through the injection needle 33 to establish the required vacuum environment. After vacuuming is completed, the switch is manually closed to completely block the connection between the vacuum chamber 321 and the capacitor's inner cavity, thereby ensuring that the vacuum environment inside the capacitor is no longer affected by external factors during subsequent liquid injection. When the pneumatic injection chamber 311 injects liquid into the capacitor, the electrolyte pressure will not be lost through the vacuum chamber 321, ensuring that the electrolyte is evenly advanced along the preset path from the pneumatic injection chamber 311, through the vacuum chamber 321, and through the injection needle 33 to the capacitor.

[0033] Mechanical isolation of the switching components cuts off potential air backflow paths during the liquid injection phase, further enhancing the purity of the vacuum environment inside the capacitor. Direct manual control of the switching components avoids the risks of mechanical wear, loosening, or seal failure caused by complex valve bodies or chamber switching in existing technologies.

[0034] In one specific embodiment, the syringe 30 further includes: a liquid storage tank 35 containing an electrolyte formed by compressed air; and a first connecting pipe 36, one end of which is connected to the liquid storage tank 35, and the other end of which is in fluid communication with the pneumatic injection chamber 311.

[0035] Specifically, the storage tank 35 serves as an external reserve source of electrolyte, capable of storing electrolyte far exceeding the capacity of the pneumatic injection chamber 311, thus meeting the needs of multiple continuous injections. It utilizes compressed air to form a stable internal pressure, providing a continuous and controllable power source for the delivery of electrolyte to the pneumatic injection chamber 311.

[0036] The first connecting pipe 36 serves as a transport channel between the liquid storage tank 35 and the pneumatic injection chamber 311, enabling the directional flow of electrolyte from the liquid storage tank 35 to the pneumatic injection chamber 311; maintaining the airtightness of the channel ensures that no external air seeps in during the electrolyte transport process, thus avoiding damage to the sealed environment of the pneumatic injection chamber 311, the vacuum chamber 321, and the inner cavity of the capacitor.

[0037] In one specific embodiment, the syringe 30 includes a first tube 31 and a second tube 32, the pneumatic injection chamber 311 is disposed in the first tube 31, the vacuum chamber 321 is disposed in the second tube 32, and the injection needle tube 33 is disposed on the side of the second tube 32 away from the first tube 31. The first tube 31 and the second tube 32 are detachably connected.

[0038] Specifically, by distributing the syringe 30 into a split structure of a first tube 31 and a second tube 32, the functions of the pneumatic injection chamber 311 and the vacuum chamber 321 are physically separated. The first tube 31 focuses on electrolyte-related operations, while the second tube 32 focuses on vacuum suction and connection to the injection needle 33. The second tube 32 integrates the vacuum chamber 321 and the injection needle 33, with the injection needle 33 located at the end of the second tube 32 furthest from the first tube 31. This minimizes the physical distance between the vacuum chamber 321 and the injection needle 33, ensuring minimal flow resistance of gas from the capacitor to the vacuum chamber 321 during vacuuming and a continuous, uninterrupted path for the electrolyte from the vacuum chamber 321 to the capacitor during injection.

[0039] The detachable connection between the first tube 31 and the second tube 32 enables rapid assembly and separation of the first tube 31 and the second tube 32: during assembly, a continuous sealed channel is formed consisting of a pneumatic injection chamber 311, a vacuum chamber 321, and an injection needle tube 33, and the airtightness after connection is achieved through sealing structures such as sealing rings and threaded fits; during separation, the two tubes can be operated separately, which is convenient for cleaning, maintenance, and replacement of parts.

[0040] In one specific embodiment, the first tube 31 has an injection port 312, which is located on the side of the pneumatic injection chamber 311 near the vacuum chamber 321, and the injection port 312 is connected to the first connecting tube 36.

[0041] Specifically, the injection port 312 is located on the side of the pneumatic injection chamber 311 near the vacuum chamber 321, so that the electrolyte delivered by the storage tank 35 enters from the downstream end of the pneumatic injection chamber 311. After the electrolyte enters from the position near the vacuum chamber 321, it does not need to flow a long distance through the entire pneumatic injection chamber 311. It can move directly towards the vacuum chamber 321 under the action of air pressure, reducing the stagnation area in the chamber.

[0042] In one specific embodiment, the syringe 30 further includes: a vacuum cylinder 37; a second connecting tube 38, one end of which is connected to the vacuum cylinder 37 and the other end of which is connected to the vacuum chamber 321, and the manual switch 34 is disposed on the second connecting tube 38.

[0043] Specifically, the evacuation cylinder 37 serves as the power source for evacuation. It is operated manually via the second connecting pipe 38 to provide continuous and controllable suction force to the vacuum chamber 321. Its volume and structural design maximize evacuation efficiency, ensuring that the gas inside the capacitor is fully extracted.

[0044] The connection between the evacuation cylinder 37 and the vacuum chamber 321 is controlled by a manual switch 34. During evacuation, the channel is opened to transfer negative pressure from the evacuation cylinder 37 to the vacuum chamber. After evacuation is complete, the channel is closed, disconnecting the connection between the evacuation cylinder 37 and the vacuum chamber 321 and locking the negative pressure state within the vacuum chamber 321. Closing the switch after evacuation prevents air from flowing back into the vacuum chamber 321 due to operation reset, ensuring that the vacuum level inside the capacitor does not decrease before liquid injection.

[0045] In one specific embodiment, the injection machine further includes: a drive member 40 disposed on the mounting frame 20; a lifting bracket 50 disposed on the mounting frame 20, wherein the drive member 40 is connected to the lifting bracket 50 so that the drive member 40 drives the lifting bracket 50 to move; and a fixing rod 60 disposed opposite to the lifting bracket 50, wherein the syringe 30 is clamped between the lifting bracket 50 and the fixing rod 60.

[0046] Specifically, the drive component 40, serving as the power source for the lifting and moving of the syringe 30, can be a motor. The lifting bracket 50, acting as the support and guide structure for the syringe 30, connects to the drive component 40 at one end to receive power, and at the other end, fixes the syringe 30 through its cooperation with the fixing rod 60. Simultaneously, it moves along the guide structure of the mounting bracket 20, such as guide rails or slides, converting the power of the drive component 40 into the vertical displacement of the syringe 30. Its structural strength ensures that there is no shaking when supporting the syringe 30 and that it maintains perpendicularity to the surface of the placement platform 10 during movement.

[0047] The fixed rod 60 and the lifting bracket 50 form a clamping mechanism. Through the relatively set rigid structure, the syringe 30 is fixed in the preset position between the lifting bracket 50 and the fixed rod 60 through the clamping surface of the lifting bracket 50 and the supporting surface of the fixed rod 60, and is perpendicular to the table surface of the placement platform 10. This ensures that the syringe 30 has no radial displacement during movement and injection. Its clamping force can be adjusted by means of bolts, springs, etc., to adapt to syringes 30 of different diameters.

[0048] In one specific embodiment, the mounting bracket 20 has a mounting part 21 and a support part 22. The mounting part 21 is disposed on the placement platform 10, and the support part 22 is disposed on the mounting part 21. The support part 22 is formed along a direction extending perpendicular to the platform of the mounting part 21, and the lifting bracket 50 is disposed on the support part 22.

[0049] Specifically, the mounting part 21 serves as the connection base between the mounting frame 20 and the placement platform 10. It is fixed to the preset position of the placement platform 10 by means of bolts, buckles, etc., and transmits the overall weight of the mounting frame 20 and the reaction force when the lifting bracket 50 moves to the placement platform 10, ensuring that the mounting frame 20 does not shift or shake. The planar structure of the mounting part 21 provides a stable installation reference for the support part 22, preventing the support part 22 from tilting due to the tilt of the mounting part 21.

[0050] The support 22 serves as the mounting carrier for the lifting bracket 50 and the drive component 40. Its perpendicularity to the surface of the placement table 10 matches the vertical insertion or extraction of the syringe 30 into the capacitor cavity, providing a linear guide structure for the lifting bracket 50. The height of the support 22 is designed to cover the maximum lifting stroke of the syringe 30, from its initial position to the depth to which the injection needle 33 is fully inserted into the capacitor, ensuring that the syringe 30 has sufficient room to move and complete the operation.

[0051] The mounting part 21 and the support part 22 are connected at a right angle to form a stable cantilever structure. The mounting part 21 is stably supported by a large contact area with the placement platform 10, and the support part 22 extends vertically upward, supporting the lifting bracket 50 and the syringe 30 at the cantilever end, which saves space and ensures structural rigidity. The right angle connection makes the force transmission path more direct. The vertical force generated when the lifting bracket 50 moves is directly transmitted to the mounting part 21 through the support part 22, and then from the mounting part 21 to the placement platform 10, reducing structural deformation and avoiding deviation in the movement of the syringe 30 due to deformation.

[0052] In one specific embodiment, it includes: a controller electrically connected to the drive unit 40 to control the movement of the lifting bracket 50; The controller alternately controls the connection between the vacuum chamber 321 and the inner cavity of the capacitor, and the connection between the pneumatic injection chamber 311 and the inner cavity of the capacitor.

[0053] Specifically, the controller acts as the brain of the overall equipment. Through the preset program settings inside the controller, it outputs electrical signals, such as pulse signals and switch signals, to the drive component 40, thereby controlling the start and stop, speed or stroke of the drive component 40, and in turn controlling the moving distance, speed and start and stop timing of the lifting bracket 50. For example, it controls the depth of the injection needle tube 33 inserted into the capacitor to a preset value of ±0.05mm, and the speed of withdrawal is smooth and without impact.

[0054] The electromagnetic switch valve on the second connecting pipe 38 and the electromagnetic switch valve on the first connecting pipe 36, which are connected to the vacuum chamber 321 and the capacitor respectively, are controlled by an electrical signal. According to the preset logic, the connection state of the two is alternately switched between vacuuming, pressure holding, liquid injection and pressure holding.

[0055] During the vacuuming phase, the channel between the vacuum chamber 321 and the capacitor is opened to ensure that the air inside the capacitor is fully extracted. During the electrolyte injection phase, the channel between the gas pressure injection chamber 311 and the capacitor is opened to ensure that the electrolyte is injected under a stable pressure, avoiding interference from the negative pressure in the vacuum chamber 321. Simultaneously, the switching timing is controlled by the controller; for example, after vacuuming for 3 seconds, it automatically switches to electrolyte injection. Once the injection volume reaches the preset value, vacuuming is performed again, and this process is repeated multiple times until the capacitor is full of electrolyte.

[0056] In one specific embodiment, the liquid injection machine further includes: a fixing frame 70, which is disposed adjacent to the processing position on the placement table 10; the fixing frame 70 has a limiting cavity 71, the opening of the limiting cavity 71 is arranged facing the processing position, so that the capacitor extends into the limiting cavity 71.

[0057] Specifically, the fixing frame 70 is a cuboid structure with an opening, one end of which communicates with the internal limiting cavity 71 to accommodate the capacitor. The position of the fixing frame 70 coincides with the moving path of the support part 22 of the mounting frame 20 and the syringe 30, and the moving axis of the injection needle tube 33, ensuring the alignment accuracy of the injection port 312 of the capacitor with the syringe 30 after placement.

[0058] The limiting cavity 71 provides a shape-fitting constraint space for the capacitor. Its inner cavity size, diameter, and depth match the shape of the capacitor to be filled with liquid. The cavity opening faces the processing position to ensure that the capacitor can naturally extend into the cavity when placed. Through the radial constraint of the cavity wall, the left and right, front and back movements and axial support are restricted, and the capacitor is fixed in a preset posture with its axis perpendicular to the table surface of the placement stage 10.

[0059] Therefore, the aforementioned manual liquid injection machine 100, by arranging the vacuum chamber 321 and the pneumatic liquid injection chamber 311 coaxially along the length of the syringe 30, and by connecting the liquid injection needle 33 to both the vacuum chamber 321 and the pneumatic liquid injection chamber 311, forms a continuous sealed channel for the electrolyte to pass sequentially through the pneumatic liquid injection chamber 311 and the vacuum chamber 321 to the inner cavity of the capacitor after the liquid injection needle 33 is inserted into the capacitor. By setting the vacuum chamber 321 to directly draw gas from inside the capacitor through the liquid injection needle 33, no mechanical movement is required after the liquid injection needle 33 is inserted into the inner cavity of the capacitor, thus preventing the infiltration of external air. By setting the vacuum chamber 321 close to the end of the liquid injection needle 33, the gas extraction path inside the capacitor is minimized, ensuring that the pneumatic liquid injection chamber 311 directly injects the electrolyte by pneumatic pressure, ensuring that the electrolyte uniformly wets the inside of the capacitor, improving the liquid injection yield and reliability, and thus preventing the backflow of external air.

[0060] The above description is merely an embodiment of this application. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of this application, but these improvements all fall within the protection scope of this application.

Claims

1. A manual liquid dispensing machine, characterized in that, include: A placement table with processing positions; The mounting bracket is placed on the placement platform; The syringe is movable and positioned on the mounting bracket along the direction perpendicular to the table surface. The syringe has a pneumatic injection chamber, a vacuum chamber, and an injection needle tube. The vacuum chamber and the pneumatic injection chamber are arranged sequentially along the length of the syringe. The vacuum chamber is located on the side close to the injection needle tube. The injection needle tube can extend into a capacitor placed on the processing position so that the inner cavity of the capacitor is connected to the vacuum chamber and the pneumatic injection chamber sequentially through the injection needle tube.

2. The manual liquid injection machine according to claim 1, characterized in that, The liquid injection machine also includes: A manual switch is connected to the evacuation channel of the vacuum chamber, and the manual switch can interrupt or connect the connection between the vacuum chamber and the inner cavity of the capacitor.

3. A manual liquid injection machine according to claim 1, characterized in that, The syringe also includes: A storage tank containing an electrolyte formed by compressed air; The first connecting pipe is connected at one end to the liquid storage tank and at the other end to the pneumatic injection chamber.

4. A manual liquid injection machine according to claim 3, characterized in that, The syringe includes a first tube and a second tube. The pneumatic injection chamber is located inside the first tube, the vacuum chamber is located inside the second tube, and the injection needle tube is located on the side of the second tube away from the first tube. The first tube and the second tube are detachably connected.

5. A manual liquid injection machine according to claim 4, characterized in that, The first tube has an injection port located on the side of the pneumatic injection chamber near the vacuum chamber, and the injection port is connected to the first connecting tube.

6. A manual liquid injection machine according to claim 2, characterized in that, The syringe also includes: Evacuation cylinder; The second connecting pipe is connected at one end to the evacuation cylinder and at the other end to the vacuum chamber. The manual switch is located on the second connecting pipe.

7. A manual liquid injection machine according to claim 1, characterized in that, The liquid injection machine also includes: The driving component is mounted on the mounting bracket; A lifting bracket is mounted on the mounting frame, and the driving component is connected to the lifting bracket so that the driving component drives the lifting bracket to move. A fixed rod is provided, which is disposed opposite to the lifting bracket, and the syringe is clamped between the lifting bracket and the fixed rod.

8. A manual liquid injection machine according to claim 7, characterized in that, The mounting bracket has a mounting part and a support part. The mounting part is disposed on the placement platform, and the support part is disposed on the mounting part. The support part is formed along the extension direction perpendicular to the platform surface of the mounting part, and the lifting bracket is disposed on the support part.

9. A manual liquid injection machine according to claim 8, characterized in that, include: The controller is electrically connected to the drive unit to control the movement of the lifting bracket; The controller alternately controls the connection between the vacuum chamber and the inner cavity of the capacitor, and the connection between the pneumatic injection chamber and the inner cavity of the capacitor.

10. A manual liquid injection machine according to claim 1, characterized in that, The liquid injection machine also includes: A fixing frame is disposed adjacent to the processing position on the placement platform; The fixing frame has a limiting cavity, and the opening of the limiting cavity is set towards the processing position so that the capacitor can extend into the limiting cavity.

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