An automatic lifting platform for an electric vehicle frame production line

Abstract

This invention proposes an automatic lifting platform for electric vehicle frame production lines, specifically relating to frame conveying equipment. The automatic lifting platform for electric vehicle frame production lines includes a frame and a movable platform slidably connected to the frame in a vertical direction. Multiple movable wheels are fixed on both sides of the movable platform. A vertically arranged hydraulic cylinder is fixedly connected to the frame, and the extended end of the hydraulic cylinder is fixedly connected to the movable platform. A horizontal guide rail is fixedly mounted on the movable platform. The automatic lifting platform for electric vehicle frame production lines provided by this invention achieves purely mechanical linkage between the frame clamping and release states and the position of the movable platform during lifting and lowering, through the cooperation of the guide rail and positioning components. When the movable platform is in its intermediate stroke, the positioning components automatically clamp the frame to prevent it from falling off during lifting. When the movable platform rises to the top or falls to the bottom, the positioning components automatically release the frame, facilitating loading and unloading operations. The entire device has a compact structure and is easy to operate.

Description

Technical Field

[0001] This invention relates to the field of vehicle frame conveying equipment technology, specifically an automatic lifting machine for electric vehicle frame production lines. Background Technology

[0002] An automatic lifting platform for electric vehicle frame production lines is a material conveying device installed on the frame assembly line. It uses a lifting platform to transfer the frame from the high-level conveyor line to the low-level return line, or from the low-level return line to the high-level conveyor line. It is widely used in the production processes of welding, painting, and final assembly of electric bicycle, electric motorcycle, and electric vehicle frames. In traditional electric vehicle frame production lines, the frame usually enters the circular assembly line from the high-level conveyor line, goes through multiple processing steps, and then returns to the lower position. It is then transported by the lifting platform to the low-level return line or back to the high-level conveyor line, forming a complete production cycle.

[0003] In existing electric vehicle frame production lines, automatic lifting platforms typically use manual clamping or electrically controlled clamps to position and fix the frames during transport. Manual clamping requires operators to manually operate bolts or quick clamps to secure the frame to the platform after it reaches the designated position, which is cumbersome and time-consuming. While electrically controlled clamps achieve automated clamping, they require sensors, controllers, and actuators, resulting in high system complexity and cost. The clamping of the frame during lifting relies entirely on the locking force of the clamps themselves or the continuous power supply of the electrical control system. If the clamps loosen or the control system malfunctions, the frame can easily slip off the platform, causing equipment damage or even personal injury. Furthermore, when loading and unloading the existing lifting platform at the top and bottom, operators need to coordinate the positioning of the lifting platform and the unlocking of the clamps simultaneously, resulting in numerous steps, low efficiency, and difficulty in meeting the high-efficiency, safe, and reliable requirements of modern production lines. Summary of the Invention

[0004] The technical problem this invention aims to solve is to overcome the issues of complex clamping and releasing operations of existing automatic lifting machines used in electric vehicle frame production lines, and the lack of mechanical interlock between the clamping state and the lifting position, which leads to safety risks during the lifting process. This invention provides an automatic lifting machine for electric vehicle frame production lines. This device, through the arrangement of a movable frame, guide rail, elastic telescopic rod, and positioning component, utilizes the lifting position of the movable platform to mechanically control the sliding of the movable frame via the guide rail, thereby driving the positioning component to switch between locked and released states. This achieves purely mechanical linkage between the frame clamping and releasing states and the lifting position of the movable platform, without the need for an electrical control system. This reduces costs and system complexity while preventing the frame from accidentally falling off during lifting.

[0005] To solve the above-mentioned technical problems, the present invention provides an automatic lifting platform for an electric vehicle frame production line, comprising a frame and a movable platform slidably connected to the frame in a vertical direction. Multiple movable wheels are fixed on both sides of the movable platform. A vertically arranged hydraulic cylinder is fixedly connected to the frame, and the extended end of the hydraulic cylinder is fixedly connected to the movable platform. A horizontal guide rail is fixedly fixed to the movable platform, and a movable frame is slidably connected to the guide rail. The movable frame is elastically connected to the guide rail via multiple elastic telescopic rods. A positioning component is provided between the guide rail and the movable frame. The positioning component includes a locking state for clamping the frame and a releasing state for releasing the clamp. A guide rail is fixed to the frame, and the guide rail includes an upper unlocking section at the top, a lower unlocking section at the bottom, and a locking section between the upper and lower unlocking sections. When the movable platform is in the middle stroke, the positioning component is in the locked state; when the movable platform rises to the upper unlocking section or descends to the lower unlocking section, the positioning component is in the released state.

[0006] Preferably, multiple guide wheels are fixedly connected to both sides of the movable frame, and guide grooves are linearly arranged on the guide rail, with the guide wheels slidably connected in the guide grooves.

[0007] Preferably, the positioning component includes a plurality of first positioning blocks fixedly connected to the guide rail and a plurality of second positioning blocks fixedly connected to the movable frame. The opposing surfaces of the first positioning blocks and the second positioning blocks are provided with arc-shaped slots adapted to the frame workpiece. When the positioning component is in the locking section, the distance between the first positioning blocks and the second positioning blocks is the same as the distance between the clamping points in the two width directions of the frame workpiece.

[0008] Preferably, a plurality of third positioning blocks are fixedly connected to the movable frame. The third positioning blocks are located between the first positioning block and the second positioning block. The third positioning blocks are provided with positioning grooves, which are used to limit the position of the frame workpiece from the length direction of the frame.

[0009] Preferably, the elastic telescopic rod includes a main rod fixedly connected to the guide rail and a secondary rod elastically connected to the main rod. One end of the secondary rod is fixedly connected to the movable frame, and the other end of the secondary rod is inserted into the main rod. A limit block is fixedly connected to the end of the secondary rod inserted into the main rod. A limit groove adapted to the size of the limit block is provided on the inner wall surface of the main rod. The secondary rod and the main rod are elastically connected by a return spring.

[0010] Preferably, a trigger block is fixedly connected to the movable frame. The trigger block overlaps with the guide rail. The guide rail has outwardly protruding convex surfaces in the upper and lower unlocking sections, and inwardly recessed convex surfaces in the locking section. The convex surfaces and the recessed surfaces are smoothly connected by a transition slope. When in the upper or lower unlocking section, the trigger block contacts the convex surface and is pushed outward to unlock the positioning component.

[0011] Preferably, an upper stop block is fixedly connected to the top of the frame, and a lower stop block is fixedly connected to the bottom of the frame. Buffer pads are fixedly connected to the opposite surfaces of the upper and lower stop blocks, and both the upper and lower stop blocks are used to limit the movement of the movable platform.

[0012] Preferably, a plurality of slide rods are fixedly connected to the frame, and the plurality of slide rods are arranged through the movable platform.

[0013] Preferably, a first limiting block and a second limiting block are fixedly connected to both ends of the guide rail, the first limiting block being used to limit the maximum travel of the movable frame toward the center of the movable platform, and the second limiting block being used to limit the maximum travel of the movable frame away from the center of the movable platform.

[0014] Preferably, elastic rubber pads are fixedly connected to the inner surfaces of the arc-shaped slots of the first positioning block and the second positioning block, and the first positioning block and the second positioning block are detachably connected to the guide rail and the movable frame by bolts.

[0015] By adopting the above technical solution, the beneficial effects achieved by the present invention are as follows: The automatic lifting platform for electric vehicle frame production lines proposed in this invention achieves purely mechanical linkage between the clamping and release states of the frame and the lifting position of the movable platform through the cooperation of guide rails and positioning components. When the movable platform is in the middle stroke, the positioning components automatically clamp the frame to prevent the frame from falling off during the lifting process. When the movable platform rises to the top or falls to the bottom, the positioning components automatically release the frame to facilitate loading and unloading operations. The entire process does not require the participation of an electrical control system. The entire device has a compact structure and is easy to operate, making it particularly suitable for production scenarios in electric vehicle frame production lines that require frequent lifting and unloading. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an automatic lifting machine for an electric vehicle frame production line according to the present invention; Figure 2 This is a schematic diagram of the automatic lifting platform for an electric vehicle frame production line from another angle, according to the present invention. Figure 3This is a diagram showing the connection relationship between the frame and the movable platform of an automatic lifting machine for an electric vehicle frame production line according to the present invention. Figure 4 This is a diagram showing the connection relationship between the movable frame and the guide rail of an automatic lifting machine for an electric vehicle frame production line according to the present invention. Figure 5 This is a schematic diagram of the movable frame of an automatic lifting machine for an electric vehicle frame production line according to the present invention; Figure 6 This is a cross-sectional schematic diagram of the elastic telescopic rod of an automatic lifting machine for an electric vehicle frame production line according to the present invention. Figure 7 This is a diagram showing the positional relationship between the trigger block and the guide rail of an automatic lifting machine for an electric vehicle frame production line according to the present invention.

[0017] Figure label: 1. Frame; 11. Movable table; 12. Movable wheel; 13. Hydraulic cylinder; 14. Upper stop block; 15. Lower stop block; 16. Buffer pad; 17. Slide rod; 2. Guide rail; 21. Movable frame; 211. Guide wheel; 212. Guide groove; 22. Elastic telescopic rod; 221. Main rod; 222. Secondary rod; 223. Limiting block; 224. Limiting groove; 225. Return spring; 24. Trigger block; 251. Protruding surface; 252. Recessed surface; 253. Transition slope; 26. First limiting stop block; 27. Second limiting stop block; 3. Positioning assembly; 31. First positioning block; 32. Second positioning block; 33. Third positioning block; 331. Third positioning groove; 34. Elastic rubber pad; 4. Guide rail; 41. Upper unlocking section; 42. Lower unlocking section; 43. Locking section; 5. Workpiece. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0020] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0021] Please see Figures 1 to 7 As shown in the figure, an automatic lifting platform for an electric vehicle frame production line provided in this embodiment of the invention includes a frame 1 and a movable platform 11 slidably connected to the frame 1 in a vertical direction. The frame 1 is a rectangular steel welded frame. The four corners of the movable platform 11 are slidably connected to the frame 1 via movable wheels 12. The base of the hydraulic cylinder 13 is fixed to the bottom of the frame 1, and the extended end is fixedly connected to the bottom surface of the movable platform 11, so that it can drive the movable platform 11 to move up and down along the guide rail 2 when it extends and retracts. A horizontally arranged guide rail 2 is fixedly connected to one side of the movable platform 11. A movable frame 21 is slidably connected to the guide rail 2. The movable frame 21 is elastically connected to the guide rail 2 via three elastic telescopic rods 22. The frame 1 is slidably connected to the guide rail 2 in a vertical direction. A straight-line fixed guide rail 4 is formed, which consists of an upper unlocking section 41, a lower unlocking section 42, and a middle locking section 43. When the movable platform 11 is in the middle stroke, the movable frame 21 is in the initial position under the action of the elastic telescopic rod 22, and the positioning component 3 clamps the frame. When the movable platform 11 rises to the top or falls to the bottom, the trigger block 24 on the movable frame 21 contacts the unlocking section of the guide rail 4 and is pushed outward, which drives the positioning component 3 to release the frame. This makes the clamping and release of the frame mechanically bound to the lifting position of the movable platform 11, without the need for an electric control system. This can prevent the frame from accidentally falling off during the lifting process, improving safety and the convenience of loading and unloading.

[0022] Please refer to Figure 4 , Figure 5 and Figure 7 As shown, two guide wheels 211 are fixed on each of the left and right sides of the movable frame 21. Guide grooves 212 corresponding to the positions of the guide wheels 211 are opened on the inner walls of both sides of the guide rail 2. The width of the guide grooves 212 is slightly larger than the wheel surface width of the guide wheels 211. The guide wheels 211 are embedded in the guide grooves 212 and can roll smoothly along the guide grooves 212. The guide grooves 212 can ensure that the movable frame 21 does not deviate during the sliding process, making the sliding of the movable frame 21 smoother and extending the service life of the device.

[0023] Two first positioning blocks 31 are fixedly connected to the guide rail 2, and two second positioning blocks 32 are fixed at corresponding positions on the movable frame 21. Arc-shaped slots are opened on the opposite surfaces of the first positioning blocks 31 and the second positioning blocks 32. The curvature of the arc-shaped slots is consistent with the curvature of the cross section of the frame tube. When the movable frame 21 is in the initial position, the distance between the first positioning blocks 31 and the second positioning blocks 32 is equal to the width between the two clamping points of the frame. The arc-shaped slots are just enough to clamp the two sides of the frame tube. When the movable frame 21 is pushed outward by the guide rail 4, the distance between the first positioning blocks 31 and the second positioning blocks 32 increases, the arc-shaped slots disengage from the frame tubes, and release the clamping of the frame.

[0024] In addition, two third positioning blocks 33 are fixed on the movable frame 21, such as Figure 5 As shown, a U-shaped positioning groove 331 is provided on the third positioning block 33. The opening of the positioning groove 331 faces upward. The width of the positioning groove 331 is adapted to the diameter of the crossbar of the frame. When the frame is in place, the crossbar falls into the positioning groove 331, which restricts the forward and backward movement of the frame in the length direction.

[0025] Specifically, the width of the frame is clamped by the first positioning block 31 and the second positioning block 32, while its length is limited by the third positioning block 33, so that the frame can be stably limited on the movable platform 11 and will not be displaced even if it is subjected to vibration or impact during the lifting process, thus ensuring safety.

[0026] A layer of elastic rubber pad 34, preferably made of nitrile rubber, is pasted on the inner surface of the arc-shaped groove of the first positioning block 31 and the second positioning block 32. The first positioning block 31 is fixed to the guide rail 2 by bolts, and the second positioning block 32 is fixed to the movable frame 21 by bolts. When it is necessary to produce different models of electric vehicle frames, the bolts can be loosened to replace the first positioning block 31 and the second positioning block 32 of the corresponding model. The elastic rubber pad 34 plays a buffering role when clamping the frame and protects the paint on the surface of the frame from being scratched. The detachable design of the two allows the device to quickly switch to produce different models of frames, thus improving the applicability of the device.

[0027] Secondly, please refer to Figure 6As shown, the main rod 221 of the elastic telescopic rod 22 is a hollow round tube, with its rear end fixed to the side wall of the guide rail 2. The secondary rod 222 is a solid round rod, with its front end welded to the movable frame 21 and its rear end inserted into the main rod 221. A limit block 223 is welded to the rear end of the secondary rod 222. A limit groove 224 is formed on the inner wall of the main rod 221, allowing the limit block 223 to slide within the limit groove 224 but preventing it from coming out. One end of the return spring 225 abuts against the inner wall of the main rod 221, and the other end abuts against the rear end face of the secondary rod 222. In the initial state... When the return spring 225 is in a pre-compressed state, it pushes the auxiliary rod 222 forward, keeping the movable frame 21 in its initial position and stably clamping the workpiece. When the movable frame 21 is pushed outward by the guide rail 4, the auxiliary rod 222 retracts into the main rod 221 against the force of the return spring 225. After the movable frame 21 leaves the unlocking section, the return spring 225 releases its elastic force, pushing the auxiliary rod 222 out and driving the movable frame 21 to reset. In specific implementation, the pre-compression amount of the return spring 225 can be adjusted as needed to ensure that the movable frame 21 has sufficient reset force.

[0028] In addition, the trigger block 24 is fixed on the side of the movable frame 21 near the frame 1, and the guide rail 4 is fixed on the side of the frame 1. The upper unlocking section 41 and the lower unlocking section 42 of the guide rail 4 are protruding protrusions, and the locking section 43 is a straight groove that is recessed inward. The protrusions and grooves are smoothly transitioned by a transition slope. When the movable platform 11 is in the middle stroke, the trigger block 24 is located in the groove of the guide rail 4 and is in contact with the guide rail 4. The movable frame 21 is in the initial position under the action of the elastic telescopic rod 22. When the movable platform 11 rises to the top, the trigger block 24 enters the protruding surface 251 of the upper unlocking section 41 and is pushed outward, causing the movable frame 21 to slide outward along the guide rail 2. When the movable platform 11 descends to the bottom, it will also cause the movable frame 21 to slide outward along the guide rail 2, thereby unlocking the frame.

[0029] Furthermore, the upper stop 14 and the lower stop 15 are welded to the top and bottom of the frame 1, respectively. A buffer pad 16, preferably made of polyurethane, is attached to the lower surface of the upper stop 14 and the upper surface of the lower stop 15. When the movable platform 11 rises to the top, the upper surface of the movable platform 11 contacts the buffer pad 16 of the upper stop 14, limiting the movable platform 11 from rising further. When the movable platform 11 falls to the bottom, the lower surface of the movable platform 11 contacts the buffer pad 16 of the lower stop 15, limiting the movable platform 11 from falling further, preventing the movable platform 11 from exceeding its travel range. Moreover, the buffer pad 16 can absorb the impact energy when the movable platform 11 reaches its limit position, protecting the movable platform 11 and the frame 1, while also reducing noise.

[0030] Please see Figure 2 and Figure 3As shown, two vertical slide rods 17 are fixed on the frame 1. Two holes adapted to the size of the slide rods 17 are opened on the movable table 11. The slide rods 17 pass through the holes, so that the movable table 11 can slide up and down along the slide rods 17. The slide rods 17 can improve the stability of the movable table 11 in raising and lowering, prevent the movable table 11 from tilting, and further ensure the safety of the device.

[0031] Specifically, a first limiting block 26 is fixed to the left end of the guide rail 2, and a second limiting block 27 is fixed to the right end. When the movable frame 21 slides to the left to its limit position, the left side of the movable frame 21 contacts the first limiting block 26, preventing the movable frame 21 from continuing to the left. When the movable frame 21 slides to the right to its limit position, the right side of the movable frame 21 contacts the rubber buffer block of the second limiting block 27, preventing the movable frame 21 from continuing to the right, thus preventing the movable frame 21 from exceeding the range of the guide rail 2 under the action of the elastic telescopic rod 22 or the guide rail 4.

[0032] Working principle: In the initial state, the movable platform 11 is located in the unlocked section at the top or bottom. At this time, the trigger block 24 contacts the protruding surface 251 of the guide rail 4, the movable frame 21 is pushed outward to the unlocked position, the elastic telescopic rod 22 is in a compressed state, the first positioning block 31 and the second positioning block 32 move away from each other, the arc-shaped slot opens, and the positioning component 3 is in a released state. Subsequently, the frame is placed on the movable frame 21, and the U-shaped groove of the third positioning block 33 initially limits the frame in the length direction. After the frame is in place, the hydraulic cylinder... 13. The moving platform 11 begins to descend or ascend. The instant the moving platform 11 leaves the unlocking section and enters the locking section 43, the trigger block 24 moves from the protruding surface 251 of the guide rail 4 through the transition slope 253 into the recessed surface 252. The trigger block 24 disengages from the guide rail 4, and the elastic telescopic rod 22 releases its elastic force, pushing the moving frame 21 to quickly return to its initial position. During the resetting process of the moving frame 21, the first positioning block 31 and the second positioning block 32 approach each other, and the arc-shaped slot clamps the frame tube from both sides. The third positioning block... Simultaneously, the frame is locked along its length. Positioning component 3 switches to the locked state, and the frame is completely fixed on the movable platform 11. When the movable platform 11 is in the locking section 43, the trigger block 24 is always located within the recessed surface 252 of the guide rail 4. The movable frame 21 maintains its initial position under the action of the elastic telescopic rod 22. Positioning component 3 continuously clamps the frame to ensure that the frame will not loosen or fall off during the lifting process. At the same time, the movable wheel 12 cooperates with the smooth lifting of the movable platform 11. When the movable platform 11 rises to the top unlocking section... When the vehicle descends to the bottom unlocking section, the trigger block 24 re-enters the protruding surface 251 of the guide rail 4 and is pushed outward, causing the movable frame 21 to overcome the elastic force of the elastic telescopic rod 22 and slide outward along the guide rail 2. The first positioning block 31 and the second positioning block 32 move away from each other, the arc-shaped slot opens, the third positioning block 33 disengages from the frame, and the positioning component 3 switches to the release state. The operator can then push the frame into the conveyor line, or push a new frame into the movable frame 21 from the conveyor line to complete the loading and unloading operation. After that, the above steps can be repeated.

[0033] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural transformations made under the concept of the present invention using the description and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. An automatic lifting platform for an electric vehicle frame production line, comprising a frame (1) and a movable platform (11) slidably connected to the frame (1) in a vertical direction, wherein multiple movable wheels (12) are fixed on both sides of the movable platform (11), and a vertically arranged hydraulic cylinder (13) is fixedly connected to the frame (1), wherein the extended end of the hydraulic cylinder (13) is fixedly connected to the movable platform (11), characterized in that: A horizontal guide rail (2) is fixed on the movable platform (11). A movable frame (21) is slidably connected to the guide rail (2). The movable frame (21) is elastically connected to the guide rail (2) by multiple elastic telescopic rods (22). A positioning component (3) is provided between the guide rail (2) and the movable frame (21). The positioning component (3) includes a locking state for clamping the frame and a releasing state for releasing the clamp. A guide rail (4) is fixed on the frame (1). The guide rail (4) includes an upper unlocking section (41) at the top, a lower unlocking section (42) at the bottom, and a locking section (43) between the upper unlocking section (41) and the lower unlocking section (42). When the movable platform (11) is in the middle stroke, the positioning component (3) is in the locking state. When the movable platform (11) rises to the upper unlocking section (41) or falls to the lower unlocking section (42), the positioning component (3) is in the releasing state.

2. The automatic lifting platform for electric vehicle frame production line according to claim 1, characterized in that: Multiple guide wheels (211) are fixedly connected to both sides of the movable frame (21), and a guide groove (212) is provided on the guide rail (2) in a linear arrangement. The guide wheels (211) are slidably connected in the guide groove (212).

3. The automatic lifting platform for electric vehicle frame production line according to claim 1, characterized in that: The positioning component (3) includes a plurality of first positioning blocks (31) fixedly connected to the guide rail (2) and a plurality of second positioning blocks (32) fixedly connected to the movable frame (21). The opposing surfaces of the first positioning blocks (31) and the second positioning blocks (32) are provided with arc-shaped slots adapted to the frame workpiece. When the positioning component (3) is in the locking section (43), the distance between the first positioning blocks (31) and the second positioning blocks (32) is the same as the distance between the clamping points in the two width directions of the frame workpiece.

4. The automatic lifting platform for electric vehicle frame production line according to claim 3, characterized in that: Multiple third positioning blocks (33) are fixedly connected to the movable frame (21). The third positioning block (33) is located between the first positioning block (31) and the second positioning block (32). The third positioning block (33) is provided with a positioning groove (331), which is used to limit the frame workpiece from the length direction of the frame.

5. The automatic lifting platform for an electric vehicle frame production line according to claim 1, characterized in that: The elastic telescopic rod (22) includes a main rod (221) fixedly connected to the guide rail (2) and a secondary rod (222) elastically connected to the main rod (221). One end of the secondary rod (222) is fixedly connected to the movable frame (21), and the other end of the secondary rod (222) is inserted into the main rod (221). A limit block (223) is fixedly connected to one end of the secondary rod (222) inserted into the main rod (221). A limit groove (224) adapted to the size of the limit block (223) is provided on the inner wall surface of the main rod (221). The secondary rod (222) and the main rod (221) are elastically connected by a return spring (225).

6. The automatic lifting platform for an electric vehicle frame production line according to claim 1, characterized in that: A trigger block (24) is fixedly connected to the movable frame (21). The trigger block (24) overlaps with the guide rail (4). The guide rail (4) has an outwardly protruding protruding surface (251) on the upper unlocking section (41) and the lower unlocking section (42). The guide rail (4) has an inwardly recessed surface (252) on the locking section (43). The protruding surface (251) and the recessed surface (252) are smoothly connected by a transition slope (253). When the trigger block (24) is in the upper unlocking section (41) or the lower unlocking section (42), it contacts the protruding surface (251) and is pushed outward to complete the unlocking of the positioning component (3).

7. The automatic lifting platform for an electric vehicle frame production line according to claim 1, characterized in that: An upper stop block (14) is fixedly connected to the top of the frame (1), and a lower stop block (15) is fixedly connected to the bottom of the frame (1). Buffer pads (16) are fixedly connected to the opposite surfaces of the upper stop block (14) and the lower stop block (15). The upper stop block (14) and the lower stop block (15) are both used to limit the movable platform (11).

8. The automatic lifting platform for an electric vehicle frame production line according to claim 1, characterized in that: Multiple slide rods (17) are fixedly connected to the frame (1), and the multiple slide rods (17) are arranged through the movable platform (11).

9. The automatic lifting platform for an electric vehicle frame production line according to claim 1, characterized in that: The guide rail (2) is fixedly connected to a first limiting block (26) and a second limiting block (27) at both ends. The first limiting block (26) is used to limit the maximum travel of the movable frame (21) toward the center of the movable platform (11), and the second limiting block (27) is used to limit the maximum travel of the movable frame (21) away from the center of the movable platform (11).

10. The automatic lifting platform for an electric vehicle frame production line according to claim 1, characterized in that: The inner surfaces of the arc-shaped slots of the first positioning block (31) and the second positioning block (32) are fixedly connected with elastic rubber pads (34), and the first positioning block (31) and the second positioning block (32) are detachably connected to the guide rail (2) and the movable frame (21) by bolts.

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