A liquid injection device for cylindrical battery

Abstract

The application discloses a kind of cylindrical battery liquid injection device, including injection component, and injection component includes injection cup component;Injection cup component includes injection cavity and liquid inlet cavity, and injection cavity and liquid inlet cavity are formed with injection cup between, and injection cup bottom is formed with injection nozzle, and injection nozzle is cooperatively provided with second lifting plug rod;Injection cavity bottom is formed with injection groove, and the inside of injection groove is installed with the sealing rubber plug that is consistent with second lifting plug rod, and the bottom end of injection groove is formed with injection needle;Liquid inlet is formed in liquid inlet cavity, and liquid inlet is communicated with liquid inlet channel;When liquid is communicated with liquid inlet, liquid can enter into liquid inlet cavity, and when second lifting plug rod is away from sealing rubber plug, liquid can enter into injection needle.The beneficial effects of the present application are that: by using servo motor to drive the coordinated operation of each execution element, the liquid injection operation is completed;Flexible design, compact structure, corresponding injection sleeve cup can be replaced according to the size of different products, so as to realize the battery model of a wide range of sizes.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery liquid injection, in particular to a cylindrical battery liquid injection device. BACKGROUND

[0002] Lithium batteries, as a high-energy-density, long-cycle-life electrochemical energy storage device, are widely used in electronic products, electric vehicles, and energy storage devices. In recent years, with the rise of renewable energy and electric vehicles, the demand for lithium batteries has surged, driving the continuous upgrading of their manufacturing processes.

[0003] In the manufacturing process of lithium batteries, the liquid injection step is crucial. The quality of liquid injection directly affects the capacity, cycle life, and safety of the battery. To meet the market demand for high-performance batteries, modern lithium battery production gradually adopts fully automatic liquid injection systems to improve production efficiency and reduce human error. However, most of the current cylindrical lithium battery liquid injection equipment on the market uses a flow line type liquid injection method, which has a narrow range of applicable product sizes, resulting in high equipment adjustment costs and long changeover times when producing different specifications of batteries. In addition, such liquid injection equipment usually has a large structure, making maintenance difficult, further affecting the overall production efficiency and reliability of the equipment. Due to these limitations, the liquid injection efficiency of existing liquid injection equipment is low, and it cannot well adapt to the rapidly changing market demand and meet the production needs of diversified specifications. SUMMARY

[0004] (I) Problems to be solved

[0005] The technical problem to be solved by the present application is to provide a cylindrical battery liquid injection device in view of the current situation of the prior art.

[0006] (II) Technical solutions

[0007] The present application is achieved by the following technical solutions: The present application provides a cylindrical battery liquid injection device, which comprises a liquid injection assembly, and the liquid injection assembly comprises a liquid injection cup assembly. The liquid injection cup assembly comprises a liquid injection cavity and a liquid inlet cavity, and a liquid injection cup is formed between the liquid injection cavity and the liquid inlet cavity. The bottom of the liquid injection cup is formed with a liquid injection nozzle, and a second lifting plug rod is arranged at the liquid injection nozzle. The bottom of the liquid injection cavity is formed with a liquid injection groove, and a sealing rubber plug that fits the second lifting plug rod is installed on the inner side of the liquid injection groove. The bottom end of the liquid injection groove is formed with a liquid injection needle. The liquid inlet cavity is formed with a liquid inlet, and the liquid inlet is connected with a liquid inlet channel. When the liquid is connected with the liquid inlet, the liquid can enter the liquid inlet cavity, and when the second lifting plug rod is away from the sealing rubber plug, the liquid can enter the liquid injection needle.

[0008] Further, the liquid injection assembly further comprises a plug rod lifting plate, a lifting cylinder, a liquid injection base plate and an air path plate, and a sealing cover plate is fixed to the upper end of the liquid inlet cavity. The liquid inlet channel passes through the sealing cover plate and is in communication with the liquid inlet, the second lifting plug rod passes through the sealing cover plate and is connected with the lifting driving part, and the lifting driving part is fixedly connected with the plug rod lifting plate; the lifting cylinder is installed on the plug rod lifting plate.

[0009] Further, the liquid injection cavity is fixedly installed on the liquid injection base plate, the liquid injection base plate is fixedly connected with the air path plate and a liquid injection cup sleeve arranged outside the liquid injection cavity, and the air path plate is connected with an air path pipe.

[0010] Further, the liquid injection assembly is fixed to the rack, and the rack is sequentially arranged and installed from top to bottom with the liquid inlet plug rod lifting assembly, the liquid injection valve moving assembly, the liquid injection assembly and the waste liquid collecting assembly.

[0011] Further, the liquid injection assembly is fixed to the rack, and the rack is sequentially arranged and installed from top to bottom with the liquid inlet plug rod lifting assembly, the liquid injection valve moving assembly, the liquid injection assembly and the waste liquid collecting assembly.

[0012] Further, the plug rod driving mechanism comprises a plug rod mounting plate guide assembly, an electric cylinder, a servo motor one and a speed reducer one connected with the servo motor one. The mounting plate guide assembly comprises a guide column and a linear bearing.

[0013] Further, the liquid injection assembly is fixed to the rack, and the rack is sequentially arranged and installed from top to bottom with the liquid inlet plug rod lifting assembly, the liquid injection valve moving assembly, the liquid injection assembly and the waste liquid collecting assembly.

[0014] Further, the waste liquid box driving mechanism is used for driving the waste liquid collecting box to move horizontally to receive the liquid dropped from the liquid injection cup assembly after the liquid injection is completed. The waste liquid box driving mechanism comprises a sliding block adapter plate fixedly connected with both ends of the waste liquid collecting box, the sliding block adapter plate is fixedly connected with a first synchronous belt and a sliding block one, the sliding block one is slidingly connected with a first linear guide rail; the first synchronous belt is matched with a first synchronous wheel, the first synchronous wheel is connected with a first synchronous shaft, and the first synchronous shaft is connected with a servo motor two and a speed reducer two.

[0015] Further, the upper end of the liquid injection assembly is provided with a liquid injection valve moving assembly. The liquid injection valve moving assembly comprises a liquid adding mechanism and a liquid injection valve driving mechanism. The liquid adding mechanism comprises a mounting horizontal plate, a sliding block adapter seat, a mounting vertical plate and a liquid adding cylinder for controlling relative movement of the liquid injection valve. The lower end of the liquid adding cylinder is connected with a liquid injection valve mounting plate, and a plurality of liquid injection valves are arranged on the liquid injection valve mounting plate in intervals. The liquid injection valve is fixedly installed by a liquid injection valve fixing block on the liquid injection valve mounting plate. The liquid injection valve driving mechanism comprises a second sliding block fixedly connected with the sliding block adapter seat, the second sliding block is in sliding connection with a second linear guide rail, and the sliding block adapter seat is connected with a second synchronous belt. The second synchronous belt is driven by a third servo motor, and the third servo motor is connected with a third speed reducer, a second synchronous wheel and a third synchronous wheel.

[0016] (Three) beneficial effects

[0017] The present application adopts a servo motor to drive the coordinated operation of each execution element, and completes the liquid injection operation of the cylindrical lithium battery. The present application is flexible in design and compact in structure, and can replace the corresponding liquid injection sleeve cup according to the size of different products, thereby realizing the adaptation to battery models in a wide size range. During the liquid injection operation, one action can simultaneously perform liquid adding operation on 18 batteries; every 18 sleeve cups are integrated on a sleeve cup adapter plate, and when the type is changed, the sleeve cup and the sleeve cup adapter plate are assembled offline and then assembled together under the liquid injection base plate, thereby realizing rapid type change. The single work position single liquid injection mechanism can reach 324 batteries, and the liquid injection efficiency is high. Compared with the traditional liquid injection equipment, the present application has the advantages of fast type change speed and high liquid injection efficiency; not only reduces the production cost, but also simplifies the difficulty of equipment maintenance, greatly improves the operation stability and reliability of the equipment; in addition, after the liquid injection, the vacuum pipe is connected with the gas path system, the internal pressure of the battery can be adjusted, and the residual electrolyte can be discharged, so that the effect of cleaning the waste liquid and fully infiltrating the electrolyte into the battery is achieved, and the battery quality is improved.

[0018] The present application is very suitable for large-scale promotion and application of enterprises, can effectively improve the flexibility and efficiency of the lithium battery production line, and helps the battery manufacturing enterprises to cope with diversified market demand. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application, and are incorporated in and constitute a part of this application. The embodiments of the application illustrated in the drawings, and their description, are presented to explain the application and are not intended to limit the application unduly.

[0020] Figure 1 is a perspective view of a cylindrical battery liquid injection device according to the present application;

[0021] Figure 2 is a perspective view of a liquid injection assembly in a cylindrical battery liquid injection device according to the present application;

[0022] Figure 3is a cross-sectional view of a liquid injection assembly in a cylindrical battery liquid injection device according to the present application;

[0023] Figure 4 is a perspective view of a liquid injection cup assembly in a cylindrical battery liquid injection device according to the present application;

[0024] Figure 5 is a perspective view of a liquid injection port plug rod lifting assembly in a cylindrical battery liquid injection device according to the present application;

[0025] Figure 6 is a perspective view of a waste liquid collection assembly in a cylindrical battery liquid injection device according to the present application;

[0026] Figure 7 is a perspective view of a liquid injection valve moving assembly in a cylindrical battery liquid injection device according to the present application.

[0027] The reference signs are described as follows:

[0028] 1, liquid injection assembly; 2, liquid injection cup assembly; 3, liquid injection port plug rod lifting assembly; 4, waste liquid collection assembly; 5, liquid injection valve moving assembly; 6, rack; 100, plug rod lifting plate; 101, lifting cylinder; 102, liquid injection base plate; 103, gas path plate; 104, sealing cover plate; 105, lifting driving part; 106, liquid injection cup sleeve; 107, gas path tube; 200, liquid injection cavity; 201, liquid inlet cavity; 202, liquid injection cup; 203, liquid injection nozzle; 204, second lifting plug rod; 205, liquid injection groove; 206, sealing rubber plug; 207, liquid injection needle; 208, liquid inlet; 209, liquid inlet channel; 300, plug rod mounting plate; 301, plug rod driving mechanism; 302, first lifting plug rod; 303, mounting plate guide assembly; 304, electric cylinder; 305, servo motor one; 306, speed reducer one; 307, guide column; 308, linear bearing; 400, waste liquid collection box; 401, waste liquid box driving mechanism; 402, sliding block adapter plate; 403, first synchronous belt; 404, sliding block one; 405, first linear guide rail; 406, first synchronous wheel; 407, first synchronous shaft; 408, servo motor two; 409, speed reducer two; 500, liquid adding mechanism; 501, liquid injection valve driving mechanism; 502, mounting horizontal plate; 503, sliding block adapter seat; 504, mounting vertical plate; 505, liquid adding cylinder; 506, liquid injection valve mounting plate; 507, liquid injection valve; 508, liquid injection valve fixing block; 509, sliding block two; 510, second linear guide rail; 511, second synchronous belt; 512, servo motor three; 513, speed reducer three; 514, second synchronous wheel; 515, third synchronous wheel. DETAILED DESCRIPTION

[0029] Clearly, the described embodiments are merely a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative effort should belong to the protection scope of the present application.

[0030] In the description of the present application, it should be understood that the terms "thickness", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0031] Please refer to Figures 1-7 The present application provides a technical solution: a cylindrical battery liquid injection device, comprising a liquid injection assembly (1), the liquid injection assembly (1) comprising a liquid injection cup assembly (2). The liquid injection cup assembly (2) comprises a liquid injection cavity (200) and a liquid inlet cavity (201), and a liquid injection cup (202) is formed between the liquid injection cavity (200) and the liquid inlet cavity (201). The bottom of the liquid injection cup (202) is formed with a liquid injection nozzle (203), and the second lifting plug rod (204) is matched and arranged at the liquid injection nozzle (203). The bottom of the liquid injection cavity (200) is formed with a liquid injection groove (205), and the inner side of the liquid injection groove (205) is mounted with a sealing rubber plug (206) matched with the second lifting plug rod (204). The bottom end of the liquid injection groove (205) is formed with a liquid injection needle (207). The liquid inlet cavity (201) is formed with a liquid inlet (208), and the liquid inlet is communicated with a liquid inlet channel (209). When the liquid is communicated with the liquid inlet (208), the liquid can enter the liquid inlet cavity (201), and when the second lifting plug rod (204) is away from the sealing rubber plug (206), the liquid can enter the liquid injection needle (207). When liquid is needed, the first lifting plug rod (302) is above the liquid inlet channel (209), and the electrolyte flows through the liquid inlet channel (209) and the liquid inlet (208) to the liquid inlet cavity (201) through the liquid injection valve (507). When liquid injection is needed, the liquid injection port plug rod lifting assembly (3) is lowered, the first lifting plug rod (302) blocks the liquid inlet channel (209), and the second lifting plug rod (204) is lifted under the action of the lifting cylinder (101), and the electrolyte flows into the battery along the liquid injection needle (207). At the same time, by switching the positive and negative pressure states in the battery-liquid injection cup assembly system through the gas path pipe, the electrolyte is fully soaked into the battery, and the quality of the battery is improved.

[0032] Specifically, the liquid injection assembly (1) further comprises a plug rod lifting plate (100), a lifting cylinder (101), a liquid injection base plate (102), and a gas path plate (103), and the upper end of the liquid inlet cavity (201) is fixed with a sealing cover plate (104). The liquid inlet channel (209) penetrates through the sealing cover plate (104) and is in communication with the liquid inlet (208), the second lifting plug rod (204) penetrates through the sealing cover plate (104) and is connected with the lifting driving element (105), and the lifting driving element (105) is fixedly connected with the plug rod lifting plate (100); the lifting cylinder (101) is installed on the plug rod lifting plate (100).

[0033] Specifically, the liquid injection cavity (201) is fixedly installed on the liquid injection base plate (102), the liquid injection base plate (102) is fixedly connected with the gas path plate (103) and a liquid injection cup sleeve (106) arranged outside the liquid injection cavity (200), and the gas path plate (103) is connected with a gas path pipe (107).

[0034] Specifically, the liquid injection assembly (1) is fixed on the rack (6), and the rack (6) is sequentially arranged and installed from top to bottom with the liquid inlet plug rod lifting assembly (3), the liquid injection valve moving assembly (5), the liquid injection assembly (1), and the waste liquid collecting assembly (4).

[0035] Specifically, the liquid injection assembly (1) is provided with the liquid inlet plug rod lifting assembly (3) at the top; the liquid inlet plug rod lifting assembly (3) comprises a plug rod mounting plate (300) and a plug rod driving mechanism (301) for controlling the lifting movement of the liquid inlet plug rod lifting assembly (3). The plug rod mounting plate (300) is installed with a first lifting plug rod (302), when the plug rod driving mechanism (301) drives the plug rod mounting plate (300) to move downward, the first lifting plug rod (302) is embedded and blocks the liquid inlet channel (209).

[0036] Specifically, the plug rod driving mechanism (301) comprises a mounting plate guide assembly (303), an electric cylinder (304), a servo motor one (305), and a speed reducer one (306) connected with the servo motor one (305). The mounting plate guide assembly (303) comprises a guide column (307) and a linear bearing (308).

[0037] Specifically, the liquid injection assembly (1) is provided with the waste liquid collecting assembly (4) below, and the waste liquid collecting assembly (4) comprises a waste liquid collecting box (400) and a waste liquid box driving mechanism (401).

[0038] Specifically, the waste liquid box driving mechanism (401) is used to drive the waste liquid collection box (400) to move horizontally to receive the liquid dropped from the liquid injection cup assembly (2) after the liquid injection is completed. The waste liquid box driving mechanism (401) comprises a sliding block adapter plate (402) fixedly connected with both ends of the waste liquid collection box (400), the sliding block adapter plate (402) is fixedly connected with a first synchronous belt (403) and a sliding block one (404), the sliding block one (404) is slidingly connected with a first linear guide rail (405); the first synchronous belt (403) is matched with a first synchronous wheel (406), the first synchronous wheel (406) is connected with a first synchronous shaft (407); the first synchronous shaft (407) is connected with a servo motor two (408) and a speed reducer two (409).

[0039] Specifically, the liquid injection assembly (1) is provided with a liquid injection valve moving assembly (5) at the upper end. The liquid injection valve moving assembly (5) comprises a liquid adding mechanism (500) and a liquid injection valve driving mechanism (501), the liquid adding mechanism (500) comprises a mounting horizontal plate (502), the mounting horizontal plate (502) is connected with a sliding block adapter seat (503), a mounting vertical plate (504) and a liquid adding cylinder (505) for controlling the relative movement of the liquid injection valve (507). The liquid adding cylinder (505) is connected with a liquid injection valve mounting plate (506) at the lower end, the liquid injection valve mounting plate (506) is arranged with a plurality of liquid injection valves (507) at intervals. The liquid injection valve (507) is fixedly installed on the liquid injection valve fixing block (508) of the liquid injection valve mounting plate (506), the liquid injection valve driving mechanism (501) comprises a sliding block two (509) fixedly connected with the sliding block adapter seat (503), the sliding block two (509) is slidingly connected with a second linear guide rail (510), and the sliding block adapter seat (503) is connected with a second synchronous belt (511). The second synchronous belt (511) is driven and connected by a servo motor three (512), the servo motor three (512) is connected with a speed reducer three (513), a second synchronous wheel (514) and a third synchronous wheel (515).

[0040] Through adopting the technical scheme, when working, the servo motor drives the synchronous wheel and the synchronous belt to drive the liquid injection valve moving assembly (5) to move to the position of the liquid inlet channel (209) of the corresponding liquid injection assembly (1), the liquid injection valve (507) injects electrolyte into the liquid inlet channel (209) according to the instruction sent by the PLC control device, all the liquid injection cups (202) are filled, and the liquid injection valve moving assembly (5) returns to the original position. The clamp transplanting jacking mechanism jacks up the full-load clamp into the liquid injection cup sleeve (106). The servo motor drives the speed reducer and the electric cylinder to drive the liquid injection port plug rod lifting assembly (3) to descend, and the first lifting plug rod (302) is pressed tightly into the liquid inlet (208). The vacuum electromagnetic valve is opened, the liquid injection assembly (1) starts to simultaneously vacuumize the battery and the liquid injection cup (202), the electromagnetic valve is closed after the pressure reaches-90KPa, and pressure maintaining is started. After the pressure maintaining time reaches, if the pressure is within the allowable range, the vacuum electromagnetic valve is opened, and liquid injection is started at the same time. The lifting cylinder (101) in the liquid injection assembly (1) drives the plug rod lifting plate (100) to drive the second lifting plug rod (204) to ascend, and the electrolyte automatically flows into the battery from the gap between the second lifting plug rod (204) and the liquid injection groove (205), and then 0.5MPa nitrogen is filled, vacuumization is performed after a certain time, and then nitrogen filling and vacuumization are alternately performed, the vacuum is broken after a certain time, the clamp transplanting jacking mechanism descends to drive the clamp to descend, the clamp transplanting assembly drags the mold assembly to drive the clamp to move away from the liquid injection position of the liquid injection mechanism. Then, the servo motor drives the synchronous wheel and the synchronous belt to drive the waste liquid collection box (400) to move to the first waste liquid collection position, nitrogen is filled to clean the inner wall of the liquid injection cup, after the cleaning of the inner wall of the liquid injection cup is completed, the lifting cylinder (101) in the liquid injection assembly (1) drives the plug rod lifting plate (100) to drive the second lifting plug rod (204) to descend, nitrogen is filled to clean the inner hole of the second lifting plug rod (204), and after the inner hole of the second lifting plug rod is cleaned, the liquid injection action is completed.

[0041] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will accord with the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A cylindrical battery injection device, characterized in that: The invention comprises a liquid injection component, wherein the liquid injection component comprises a liquid injection cup component; the liquid injection cup component comprises a liquid injection cavity and a liquid inlet cavity, a liquid injection cup is formed between the liquid injection cavity and the liquid inlet cavity, a liquid injection nozzle is formed at the bottom of the liquid injection cup, and a second lifting blocking rod is provided at the liquid injection nozzle; a liquid injection groove is formed at the bottom of the liquid injection cavity, a sealing rubber plug that fits with the second lifting blocking rod is installed on the inner side of the liquid injection groove, and a liquid injection needle is formed at the bottom end of the liquid injection groove; a liquid inlet is formed in the liquid inlet cavity, and the liquid inlet is connected to the liquid inlet channel; liquid When connected with the liquid inlet, the liquid can enter the liquid inlet cavity, and when the second lifting blocking rod is away from the sealing plug, the liquid can enter the injection needle; the injection assembly also includes a blocking rod lifting plate, a lifting cylinder, a liquid injection base plate and an air circuit plate; a sealing cover plate is fixed to the upper end of the liquid inlet cavity; the liquid inlet channel passes through the sealing cover plate and is connected with the liquid inlet, the second lifting blocking rod passes through the sealing cover plate and is connected to the lifting drive component, and the lifting drive component is fixedly connected to the blocking rod lifting plate; the lifting cylinder is installed on the blocking rod lifting plate.

2. A cylindrical battery liquid injection device according to claim 1, characterized in that: The liquid inlet cavity is fixedly mounted on the liquid injection base plate, the liquid injection base plate is fixedly connected to the air circuit board and the liquid injection cup sleeve arranged outside the liquid injection cavity, and the air circuit board is connected to an air circuit pipe.

3. The cylindrical battery liquid injection device according to claim 1, characterized in that: The liquid injection assembly is fixed on a frame, and the frame is sequentially arranged from top to bottom with a liquid injection port blocking rod lifting assembly, a liquid injection valve moving assembly, a liquid injection assembly, and a waste liquid collection assembly.

4. The cylindrical battery liquid injection device according to claim 1, characterized in that: A liquid injection port blocking rod lifting assembly is correspondingly provided on the top of the liquid injection assembly; the liquid injection port blocking rod lifting assembly includes a blocking rod mounting plate and a blocking rod driving mechanism for controlling the lifting movement of the liquid injection port blocking rod lifting assembly; the blocking rod mounting plate is installed with a first lifting blocking rod, and when the blocking rod driving mechanism drives the blocking rod mounting plate to move downward, the first lifting blocking rod is embedded in and blocks the liquid inlet channel.

5. The cylindrical battery liquid injection device according to claim 4, characterized in that: The blocking rod driving mechanism includes a blocking rod mounting plate guide assembly, an electric cylinder, a servo motor and a reducer connected to the servo motor; the mounting plate guide assembly includes a guide column and a linear bearing.

6. The cylindrical battery liquid injection device according to claim 1, characterized in that: A waste liquid collecting assembly is correspondingly provided below the liquid injection assembly, and the waste liquid collecting assembly includes a waste liquid collecting box and a waste liquid box driving mechanism.

7. The cylindrical battery liquid injection device according to claim 6, characterized in that: The waste liquid box driving mechanism is used to drive the waste liquid collection box to move horizontally to receive the liquid dripping from the injection cup assembly after the injection is completed; the waste liquid box driving mechanism includes a slider adapter plate fixedly connected to both ends of the waste liquid collection box, the slider adapter plate is fixedly connected to the first synchronous belt and slider one, and the slider one is slidably connected to the first linear guide rail; the first synchronous belt is equipped with a first synchronous wheel, and the first synchronous wheel is connected to the first synchronous rotating shaft; the first synchronous rotating shaft is connected to and installed with servo motor two and reducer two.

8. The cylindrical battery liquid injection device according to claim 1, characterized in that: A liquid injection valve moving assembly is provided at the upper end of the liquid injection assembly; the liquid injection valve moving assembly includes a liquid adding mechanism and a liquid injection valve driving mechanism; the liquid adding mechanism includes a mounting horizontal plate, the mounting horizontal plate is installed and connected with a slider adapter, a mounting vertical plate and a liquid adding cylinder for controlling the relative movement of the liquid injection valve; the lower end of the liquid adding cylinder is connected with a liquid injection valve mounting plate, and a plurality of liquid injection valves are arranged at intervals on the liquid injection valve mounting plate; the liquid injection valve is fixed by the liquid injection valve fixing block on the liquid injection valve mounting plate; the liquid injection valve driving mechanism includes a slider 2 fixedly connected to the slider adapter, the slider 2 is slidably connected to the second linear guide rail, and the slider adapter is connected to the second synchronous belt; the second synchronous belt is driven and connected by a servo motor 3, and the servo motor 3 is connected to a reducer 3, a second synchronous wheel and a third synchronous wheel.

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