Lithium battery protective shell welding device

Abstract

The invention discloses a lithium battery protective shell welding device, and belongs to the field of welding devices. The conveying belt is arranged on the inner side of the bottom box; the mounting plate is fixedly connected to the top of the bottom box; the electric telescopic rod is fixedly connected to the top of the mounting plate; the lifting plate is fixedly connected to the output end of the electric telescopic rod; the welding gun is arranged at the bottom of the lifting plate; and the inner wall of the mounting plate is fixedly connected with a [-shaped frame, and the inner side of the [-shaped frame is rotationally connected with two rotating rods. By arranging the cleaning mechanism driven by the lifting plate, automatic cleaning of the welding needle of the welding gun is achieved in the welding process, the problem that the welding needle is prone to being polluted by splashes is effectively solved, the welding quality and efficiency are guaranteed, meanwhile, the cleaning action is linked with the welding process, no extra power source is needed, the structure is ingenious, and the automation degree is high.

Description

Technical Field

[0001] This application relates to the field of welding apparatus, and more specifically, to a welding apparatus for a lithium battery protective casing. Background Technology

[0002] Lithium batteries are a type of battery that uses lithium metal or lithium alloy as the positive / negative electrode material and a non-aqueous electrolyte solution.

[0003] For example, Chinese Patent Publication No. CN110788448B discloses the following technical solution: a smart welding device for lithium battery protective shell, including an electric welding machine and an argon gas tank. The electric welding machine is equipped with a welding gun, a welding needle, an electromagnetic switch and a ground wire connection. The electric welding machine and the cylinder fixing seat are respectively placed on other parts. The welding needle is installed in the welding gun cavity. The welding gun and the electromagnetic switch are respectively installed and locked on other parts.

[0004] The existing technology has the following problems: The aforementioned device lacks a welding needle cleaning mechanism linked to the welding process. When welding lithium battery protective shells, welding spatter easily adheres to the welding needle, affecting its conductivity and heating uniformity. This leads to unstable current transmission and uneven heat distribution during welding, resulting in decreased weld quality and issues such as incomplete or false welds. If the welding needle is not cleaned in time, the accumulated spatter will alter its shape with each welding cycle, further reducing welding precision. Moreover, manual cleaning of the welding needle before each welding cycle is time-consuming and severely impacts welding efficiency. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a lithium battery protective casing welding device, which solves the problems mentioned in the background section.

[0006] To achieve the above objectives, this application provides a lithium battery protective casing welding device, comprising: a base box; a conveyor belt disposed inside the base box; a mounting plate fixedly connected to the top of the base box; an electric telescopic rod fixedly connected to the top of the mounting plate; a lifting plate fixedly connected to the output end of the electric telescopic rod; and a welding gun disposed at the bottom of the lifting plate. A U-shaped frame is fixedly connected to the inner wall of the mounting plate. Two rotating rods are rotatably connected to the inner side of the U-shaped frame. Worm gears are fixedly sleeved on the outer walls of the two rotating rods. A fixing block is fixedly connected to the lower end of the U-shaped frame. A worm gear cylinder is rotatably connected to the upper end of the fixing block. A connecting plate A is fixedly connected to the outer wall of the lifting plate. A lifting rod is fixedly connected to the bottom of the connecting plate A. A guide groove is opened on the outer wall of the lifting rod. A sliding shaft is fixedly connected to the inner wall of the worm gear cylinder. A strip rod is fixedly connected to the outer wall of the rotating rod. A movable cylinder is movably sleeved on the outer wall of the rotating rod. A cleaning brush cylinder is fixedly connected to one end of the movable cylinder. A movable plate is slidably connected to the inner side of the U-shaped frame. The movable plate is rotatably connected to the movable cylinder through a bearing. A connecting rod is hinged to the upper end of the movable plate. A movable plate is hinged to the other end of the connecting rod.

[0007] Preferably, the inner wall of the movable cylinder is provided with a slot, and the strip rod is slidably connected inside the slot.

[0008] Preferably, a limiting rod is fixedly connected to the upper end of the C-shaped frame, the movable plate slides through the limiting rod, and a spring A is fixedly connected between the C-shaped frame and the movable plate.

[0009] Preferably, the two worm gears are located on both sides of the worm barrel and mesh with it.

[0010] Preferably, a protective assembly is fitted on the outer side of the mounting plate. The protective assembly includes a fixing plate, which is fixedly connected to the side of the mounting plate. Rotating shafts are rotatably connected to both sides of the fixing plate. A mounting sleeve is fixedly connected to the other end of the rotating shaft. A slider is slidably connected inside the mounting sleeve. A protective plate is hinged to the other end of the slider. A linkage rod is fixedly connected to the outer wall of the lifting plate. A linkage groove is opened on the inner side of one side of the protective plate. The end of the linkage rod away from the lifting plate is slidably connected inside the linkage groove.

[0011] Preferably, a spring B is fixedly connected to the bottom of the inner part of the mounting sleeve, and the other end of the spring B is fixedly connected to the bottom of the slider.

[0012] Preferably, the outer wall of the mounting plate is fixedly connected to a guide rail, and the protective plate is slidably connected to the outer wall of the guide rail.

[0013] Preferably, a positioning component is provided on the inner side of the mounting plate. The positioning component includes an elastic telescopic rod, which is fixedly connected to the top of the mounting plate. A connecting plate B is fixedly connected to the bottom of the elastic telescopic rod. An adjusting plate is fixedly connected to the outer wall of the connecting plate B. An inclined groove is formed on the outer wall of the adjusting plate. An adjusting shaft is slidably connected inside the inclined groove. An adjusting rod is fixedly connected to one end of the adjusting shaft. A positioning plate is fixedly connected to the bottom of the adjusting rod. A fixing frame is fixedly connected to the bottom of one side of the protective plate. An L-shaped plate is slidably connected inside the fixing frame.

[0014] Preferably, the outer wall of the fixing frame and the positioning plate is provided with an insertion hole, and an insertion rod is inserted into the insertion hole.

[0015] Preferably, the top of the mounting plate has a through groove, and the outer wall of the adjusting rod is slidably connected to the through groove.

[0016] The advantages of this application are: (1) This application achieves automatic cleaning of the welding torch needle during the welding process by setting up a cleaning mechanism driven by a lifting plate. Specifically, when the lifting plate descends, it drives the lifting rod to move down through the connecting plate A. The linear motion is converted into the rotation of the worm gear cylinder by the cooperation of the guide groove and the sliding shaft, which in turn drives the worm wheel and the rotating rod to rotate, so that the cleaning brush cylinder rotates to clean the welding needle. When the lifting plate continues to descend, it pushes the movable plate down, which drives the movable plate and the cleaning brush cylinder to move laterally through the connecting rod to avoid interfering with the welding. This design effectively solves the problem of welding needles being easily contaminated by spatter, ensuring welding quality and efficiency. At the same time, the cleaning action is linked with the welding process, requiring no additional power source. The structure is ingenious and highly automated.

[0017] (2) This application, through the design of the protective component, automatically forms a closed protective space during welding, significantly improving operational safety. When the lifting plate descends, the protective plate is driven to rotate and move downward through the cooperation of the linkage rod and the linkage groove, and flexible transmission is achieved by using spring B and slider structure, so that the protective plate finally fits against the bottom box, effectively isolating welding sparks and fumes; after welding is completed, the lifting plate rises, and the protective plate automatically resets under the action of the spring. This component not only protects the operator from high-temperature splashes and harmful fumes, but also extends the service life due to the high-temperature resistant material. The overall action is synchronized with the welding process, requiring no manual intervention, thus balancing safety and convenience.

[0018] (3) This application achieves flexible clamping and positioning of lithium battery casings of different sizes through the adjustable structure of the positioning component. When the protective plate descends, it drives the fixed frame and L-shaped plate to press down the connecting plate B. The vertical movement is converted into the lateral movement of the adjusting rod through the cooperation of the inclined groove and the adjusting shaft, so that the positioning plate and the L-shaped plate work together to clamp the casing. By adjusting the position of the L-shaped plate in the fixed frame and inserting the plug rod, the clamping timing and stroke can be changed to adapt to casings of different widths. This design enhances the versatility of the device, avoids the tediousness of changing the positioning mold, improves production efficiency, and at the same time, the clamping force is buffered by the elastic telescopic rod to prevent damage to the casing. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the top cross-sectional structure of the present invention. Figure 1 ; Figure 3 This is the invention Figure 2 Enlarged structural diagram at point B; Figure 4 This is a schematic diagram of the top cross-sectional structure of the present invention. Figure 2 ; Figure 5 This is the invention Figure 4 Enlarged structural diagram at point A in the middle; Figure 6 This is a schematic diagram of the back structure of the present invention; Figure 7 This is the invention Figure 6 Enlarged structural diagram at point C.

[0020] In the above image, 1. Base box; 2. Conveyor belt; 3. Mounting plate; 4. Electric telescopic rod; 5. Lifting plate; 6. Welding gun; 71. C-shaped frame; 72. Rotating rod; 73. Worm gear; 74. Fixing block; 75. Worm cylinder; 76. Connecting plate A; 77. Lifting rod; 78. Guide groove; 79. Sliding shaft; 710. Strip rod; 711. Moving cylinder; 712. Cleaning brush cylinder; 713. Moving plate; 714. Connecting rod; 715. Movable plate; 716. Limiting rod; 717. Spring A 8. Protective component; 81. Fixing plate; 82. Rotating shaft; 83. Mounting sleeve; 84. Slider; 85. Protective plate; 86. Linkage rod; 87. Linkage groove; 88. Guide rail; 89. Spring B; 9. Positioning component; 91. Elastic telescopic rod; 92. Connecting plate B; 93. Adjusting plate; 94. Inclined groove; 95. Adjusting shaft; 96. Adjusting rod; 97. Positioning plate; 98. Fixing frame; 99. L-shaped plate; 910. Insertion hole; 911. Insert rod; 912. Through groove. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative effort should fall within the scope of protection of the present application.

[0022] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be used interchangeably where appropriate for the purposes of describing embodiments of this application herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0023] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0024] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0025] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] Example 1, please refer to Figures 1-7 This embodiment provides a lithium battery protective shell welding device, including: a base box 1; a conveyor belt 2, which is disposed inside the base box 1; a mounting plate 3, which is fixedly connected to the top of the base box 1; an electric telescopic rod 4, which is fixedly connected to the top of the mounting plate 3; a lifting plate 5, which is fixedly connected to the output end of the electric telescopic rod 4; and a welding gun 6, which is disposed at the bottom of the lifting plate 5. An inverted bracket 71 is fixedly connected to the inner wall of the mounting plate 3. Two rotating rods 72 are rotatably connected to the inner side of the inverted bracket 71. Worm gears 73 are fixedly sleeved on the outer walls of the two rotating rods 72. A fixing block 74 is fixedly connected to the lower end of the inverted bracket 71. A worm gear cylinder 75 is rotatably connected to the upper end of the fixing block 74. A connecting plate A76 is fixedly connected to the outer wall of the lifting plate 5. A lifting rod 77 is fixedly connected to the bottom of the connecting plate A76. A guide groove 78 is opened on the outer wall of the lifting rod 77. The worm gear cylinder A sliding shaft 79 is fixedly connected to the inner wall of the rotating rod 72, a strip rod 710 is fixedly connected to the outer wall of the rotating rod 72, a movable cylinder 711 is movably sleeved on the outer wall of the rotating rod 72, a cleaning brush cylinder 712 is fixedly connected to one end of the movable cylinder 711, a movable plate 713 is slidably connected to the inner side of the shaped frame 71, the movable plate 713 is rotatably connected to the movable cylinder 711 through a bearing, a connecting rod 714 is hinged to the upper end of the movable plate 713, and a movable plate 715 is hinged to the other end of the connecting rod 714.

[0028] The inner wall of the movable cylinder 711 is provided with a slot, and the strip rod 710 is slidably connected inside the slot, ensuring that the strip rod 710 slides in the slot of the movable cylinder 711 according to a predetermined trajectory, thereby realizing the relative movement or position adjustment between the two.

[0029] A limiting rod 716 is fixedly connected to the upper end of the U-shaped frame 71. The movable plate 715 slides through the limiting rod 716. A spring A717 is fixedly connected between the U-shaped frame 71 and the movable plate 715, enabling the entire structure to undergo elastic deformation under stress and quickly return to its original shape after the force disappears, thus ensuring the stability and reliability of the device operation. Two worm gears 73 are located on both sides of the worm cylinder 75 and mesh with it. The two worm gears 73 are symmetrically distributed, ensuring that the worm cylinder 75 can simultaneously drive the worm gears 73 on both sides to move synchronously when rotating.

[0030] In use, the battery protective shell to be welded is first placed on the upper end of the conveyor belt 2, and then transported to the lower part of the welding gun 6 by the conveyor belt 2. Then, the electric telescopic rod 4 is activated to drive the lifting plate 5 at the output end to descend. The welding gun 6 at the bottom of the lifting plate 5 will then descend to a certain height to weld the battery shell. At the same time, the descent of the lifting plate 5 will drive the connecting plate A76 on its side to descend, and the connecting plate A76 will drive the lifting rod 77 at its bottom to descend. When the lifting rod 77 descends, the guide groove 78 on its outer wall interacts with the sliding shaft 79 on the inner wall of the worm cylinder 75. Since the sliding shaft 79 is fitted into the guide groove 78, the vertical movement of the lifting rod 77 is converted into the rotational motion of the worm cylinder 75. After the worm cylinder 75 rotates, it simultaneously drives the worm wheels 73 meshing with it on both sides to rotate, and then the worm wheels 73 drive the rotating rod 72 to rotate. The strip rod 710 on the outer wall of the rotating rod 72 is connected to the moving cylinder 711 through a slot. The rotation of the rotating rod 72 will drive the moving cylinder 711 to rotate synchronously, which will cause the cleaning brush cylinder 712 to rotate, thereby cleaning the area around the welding needle of the welding gun 6. When the lifting plate 5 descends to a certain height, it will contact the top of the movable plate 715 and push the movable plate 715 to slide down along the limit rod 716. At this time, the spring A717 is compressed. The movable plate 715 pulls the moving plate 713 to slide inside the C-shaped frame 71 through the connecting rod 714. The moving plate 713 drives the moving cylinder 711 to gradually move away from the welding gun 6 along the strip rod 710, thereby avoiding obstructing the normal operation of the larger upper part of the welding gun 6. After welding is completed, the electric telescopic rod 4 drives the lifting plate 5 to rise and reset. At this time, the lifting rod 77 moves upward, and the cooperation between the guide groove 78 and the sliding shaft 79 causes the worm cylinder 75 to rotate in the opposite direction. The worm wheel 73 and the rotating rod 72 then rotate in the opposite direction, and the cleaning brush cylinder 712 rotates again to clean the welding needle. At the same time, the movable plate 715 resets upward under the elastic force of the spring A717, and pushes the moving plate 713 to move through the connecting rod 714, so that the moving cylinder 711 drives the cleaning brush cylinder 712 to reset along the strip rod 710 for cleaning before the next welding.

[0031] Example 2, please refer to Figures 1-7 Based on embodiment 1, a protective component 8 is assembled on the outer side of the mounting plate 3. The protective component 8 includes a fixing plate 81, which is fixedly connected to the side of the mounting plate 3. A rotating shaft 82 is rotatably connected to both sides of the fixing plate 81. A mounting sleeve 83 is fixedly connected to the other end of the rotating shaft 82. A slider 84 is slidably connected inside the mounting sleeve 83. A protective plate 85 is hinged to the other end of the slider 84. A linkage rod 86 is fixedly connected to the outer wall of the lifting plate 5. A linkage groove 87 is opened on the inner side of one side of the protective plate 85. The end of the linkage rod 86 away from the lifting plate 5 is slidably connected inside the linkage groove 87.

[0032] A spring B89 is fixedly connected to the bottom of the inner part of the mounting sleeve 83. The other end of the spring B89 is fixedly connected to the bottom of the slider 84. The spring B89 ensures the flexibility and stability of the entire structure, so that the slider 84 can move smoothly along the inner wall of the mounting sleeve 83 when force is applied, and return to its original position by the restoring force of the spring B89 after the force is removed.

[0033] The outer wall of the mounting plate 3 is fixedly connected to the guide rail 88, and the protective plate 85 is slidably connected to the outer wall of the guide rail 88. The guide rail 88 provides a stable guiding effect for the movement of the protective plate 85, ensuring that the protective plate 85 will not deviate or shake during the sliding process, thereby ensuring the overall stability and reliability of the protective assembly 8.

[0034] In use, when the lifting plate 5 descends, the linkage rod 86 on its outer wall slides in the linkage groove 87 inside the protective plate 85. When the linkage rod 86 slides to the bottom of the linkage groove 87, the continued descent will drive one side of the protective plate 85 to move downward along the guide rail 88. When the protective plate 85 moves, it will drive the slider 84 and the mounting sleeve 83 to rotate with the rotating shaft 82, and will push the slider 84 to slide in the mounting sleeve 83 and compress the spring B89. When the protective plate 85 drives the slider 84 and the mounting sleeve 83 to rotate to be parallel to the surface of the conveyor belt 2, the lifting plate 5 can still continue to rotate a certain distance. As the lifting plate 5 continues to descend, the slider 84 will quickly slide outward from the mounting sleeve 83 under the action of the spring B89. Even when the lifting plate 5 can no longer descend, the slider 84 can still push the protective plate 85 down along the outer wall of the guide rail 88 until it is in contact with the base box 1. At this time, the linkage rod 86 will slide inside the linkage groove 87, ensuring that the protective plate 85 can continue to descend. This creates a closed protective space during welding, preventing sparks and fumes generated during welding from spreading to the outside and effectively protecting the safety of the operators. Simultaneously, the protective plate 85 is made of high-temperature resistant material, capable of withstanding the high-temperature environment during welding, extending its service life. After welding is completed, the lifting plate 5 rises, the linkage rod 86 slides upward in the linkage groove 87, and the protective plate 85 moves upward along the guide rail 88 under the elastic force of the spring B89 and with the cooperation of the slider 84, the mounting sleeve 83 and the rotating shaft 82, and gradually rotates and resets, opening the protective space so that the conveyor belt 2 can transport the welded shell out without affecting the continuous operation of the device.

[0035] Example 3, please refer to Figures 1-7 Based on embodiment 1, a positioning component 9 is provided on the inner side of the mounting plate 3. The positioning component 9 includes an elastic telescopic rod 91, which is fixedly connected to the top of the mounting plate 3. A connecting plate B92 is fixedly connected to the bottom of the elastic telescopic rod 91. An adjusting plate 93 is fixedly connected to the outer wall of the connecting plate B92. An inclined groove 94 is provided on the outer wall of the adjusting plate 93. An adjusting shaft 95 is slidably connected inside the inclined groove 94. An adjusting rod 96 is fixedly connected to one end of the adjusting shaft 95. A positioning plate 97 is fixedly connected to the bottom of the adjusting rod 96. A fixing frame 98 is fixedly connected to the bottom of one side protective plate 85. An L-shaped plate 99 is slidably connected inside the fixing frame 98.

[0036] The outer wall of the fixed frame 98 and the positioning plate 97 is provided with an insertion hole 910. An insertion rod 911 is inserted into the insertion hole 910. The insertion hole 910 is used to insert the insertion rod 911. The insertion rod 911 can be firmly inserted into it, thereby realizing the connection or positioning function between the fixed frame 98 and the positioning plate 97.

[0037] The top of the mounting plate 3 is provided with a through groove 912. The outer wall of the adjusting rod 96 is slidably connected to the through groove 912. This connection method allows the adjusting rod 96 to slide flexibly with the cooperation of the outer wall and the through groove 912, thereby achieving the expected adjustment effect and functional requirements.

[0038] In use, when the protective plate 85, which is fixedly connected to one side of the fixed frame 98, descends, the fixed frame 98 will move down synchronously with the protective plate 85, thereby causing the L-shaped plate 99 to approach the connecting plate B92. When the L-shaped plate 99 contacts the connecting plate B92, it will cause the connecting plate B92 to descend, compressing the elastic telescopic rod 91. The connecting plate B92 will then cause the adjusting plate 93 to move down. During the downward movement of the adjusting plate 93, the inclined groove 94 generates a lateral thrust on the adjusting shaft 95, causing the adjusting shaft 95 to slide along the inclined groove 94, thereby causing the adjusting rod 96 to move laterally along the through groove 912. When the adjusting rod 96 moves, the positioning plate 97 at its bottom approaches the battery protective shell and cooperates with the L-shaped plate 99 to clamp and position the shell from both sides. If it is necessary to position battery shells of different widths, the position of the L-shaped plate 99 inside the fixed frame 98 can be changed, thereby changing the contact time between the L-shaped plate 99 and the connecting plate B92, so as to adjust the downward stroke of the adjusting plate 93. Specifically, the fixing can be achieved by inserting the rod 911 into the corresponding insertion hole 910 on the outer wall of the fixed frame 98 and the L-shaped plate 99. When the L-shaped plate 99 slides outward within the fixed frame 98, its contact position with the connecting plate B92 is delayed, the downward stroke of the connecting plate B92 is reduced, the downward movement distance of the adjusting plate 93 is shortened, the lateral thrust of the inclined groove 94 on the adjusting shaft 95 is reduced, and the lateral movement distance of the positioning plate 97 driven by the adjusting rod 96 is correspondingly reduced, thus adapting to the positioning requirements of narrower housings. Conversely, when the L-shaped plate 99 slides inward, the contact timing is advanced, the downward stroke of the connecting plate B92 is increased, and the lateral movement distance of the positioning plate 97 is increased to match the positioning of wider housings. This adjustable structure allows the device to be compatible with various specifications of lithium battery protective housings, improving the versatility and applicability of the equipment.

[0039] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A welding device for a lithium battery protective casing, characterized in that, include: Base box; A conveyor belt, which is disposed inside the bottom box; Mounting plate, which is fixedly connected to the top of the base box; An electric telescopic pole, which is fixedly connected to the top of the mounting plate; A lifting plate, which is fixedly connected to the output end of an electric telescopic rod; A welding gun, which is located at the bottom of the lifting plate; A U-shaped frame is fixedly connected to the inner wall of the mounting plate. Two rotating rods are rotatably connected to the inner side of the U-shaped frame. Worm gears are fixedly sleeved on the outer walls of the two rotating rods. A fixing block is fixedly connected to the lower end of the U-shaped frame. A worm gear cylinder is rotatably connected to the upper end of the fixing block. A connecting plate A is fixedly connected to the outer wall of the lifting plate. A lifting rod is fixedly connected to the bottom of the connecting plate A. A guide groove is opened on the outer wall of the lifting rod. A sliding shaft is fixedly connected to the inner wall of the worm gear cylinder. A strip rod is fixedly connected to the outer wall of the rotating rod. A movable cylinder is movably sleeved on the outer wall of the rotating rod. A cleaning brush cylinder is fixedly connected to one end of the movable cylinder. A movable plate is slidably connected to the inner side of the U-shaped frame. The movable plate is rotatably connected to the movable cylinder through a bearing. A connecting rod is hinged to the upper end of the movable plate. A movable plate is hinged to the other end of the connecting rod.

2. The lithium battery protective casing welding device according to claim 1, characterized in that, The inner wall of the movable cylinder is provided with a slot, and the strip rod is slidably connected inside the slot.

3. The lithium battery protective casing welding device according to claim 1, characterized in that, A limiting rod is fixedly connected to the upper end of the C-shaped frame, and the movable plate slides through the limiting rod. A spring A is fixedly connected between the C-shaped frame and the movable plate.

4. The lithium battery protective casing welding device according to claim 1, characterized in that, The two worm gears are located on both sides of the worm barrel and mesh with it.

5. The lithium battery protective casing welding device according to claim 1, characterized in that, The outer side of the mounting plate is equipped with a protective component, which includes a fixing plate. The fixing plate is fixedly connected to the side of the mounting plate. Rotating shafts are rotatably connected to both sides of the fixing plate. A mounting sleeve is fixedly connected to the other end of the rotating shaft. A slider is slidably connected inside the mounting sleeve. A protective plate is hinged to the other end of the slider. A linkage rod is fixedly connected to the outer wall of the lifting plate. A linkage groove is opened on the inner side of one side of the protective plate. The end of the linkage rod away from the lifting plate is slidably connected inside the linkage groove.

6. The lithium battery protective casing welding device according to claim 5, characterized in that, A spring B is fixedly connected to the bottom of the inner part of the mounting sleeve, and the other end of the spring B is fixedly connected to the bottom of the slider.

7. A lithium battery protective casing welding device according to claim 6, characterized in that, The outer wall of the mounting plate is fixedly connected to a guide rail, and the protective plate is slidably connected to the outer wall of the guide rail.

8. The lithium battery protective casing welding device according to claim 7, characterized in that, A positioning assembly is provided on the inner side of the mounting plate. The positioning assembly includes an elastic telescopic rod, which is fixedly connected to the top of the mounting plate. A connecting plate B is fixedly connected to the bottom of the elastic telescopic rod. An adjusting plate is fixedly connected to the outer wall of the connecting plate B. An inclined groove is formed on the outer wall of the adjusting plate. An adjusting shaft is slidably connected inside the inclined groove. An adjusting rod is fixedly connected to one end of the adjusting shaft. A positioning plate is fixedly connected to the bottom of the adjusting rod. A fixing frame is fixedly connected to the bottom of one side of the protective plate. An L-shaped plate is slidably connected inside the fixing frame.

9. A lithium battery protective casing welding device according to claim 8, characterized in that, The outer wall of the fixed frame and the positioning plate is provided with insertion holes, and a plug rod is inserted into the insertion hole.

10. A lithium battery protective casing welding device according to claim 9, characterized in that, The top of the mounting plate has a through groove, and the outer wall of the adjusting rod is slidably connected to the through groove.

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