Positioning and overturning clamp for rear end cover of new energy vehicle aluminum alloy

Abstract

The utility model relates to the technical field of turnover fixture, concretely is a kind of positioning turnover fixture of new energy car aluminum alloy rear end cover, including mobile seat, the top of mobile seat is provided with work platform, clamping mechanism is arranged on the work platform, the clamping mechanism includes: support frame, fixedly connected with stepper motor on the support frame, the output shaft of stepper motor is fixedly connected with Y type support arm.The utility model is provided with clamping mechanism, and guiding rod and flexible ball form multi-point clamping structure, and the flexible ball of different positions can be adjusted to extend length according to the actual profile of rear end cover inner wall, the flexible ball of protruding place is blocked and extends shorter, the flexible ball of recessed place is longer, realize the multi-point flexible clamping of irregular rear end cover, both avoid the deformation of workpiece caused by rigid clamping, and can ensure that rear end cover always maintains center positioning accuracy in the process of turning over, meet the demand of turning operation in the processing of aluminum alloy rear end cover.

Description

Technical Field

[0001] This utility model relates to the field of flipping fixture technology, specifically a positioning and flipping fixture for an aluminum alloy rear end cover of a new energy vehicle. Background Technology

[0002] In the processing of aluminum alloy rear end caps for new energy vehicles, a positioning and flipping fixture is required to clamp and flip the workpiece in order to meet the multi-faceted processing requirements.

[0003] Currently, traditional positioning and flipping fixtures mostly employ rigid jaws or fixed fulcrum structures for their clamping mechanisms, which present the following problems: The fixed clamping point positions of existing fixtures cannot accommodate the irregular inner wall contours of the rear end cover caused by casting or machining errors, resulting in uneven force distribution at each contact point during clamping. For low-rigidity materials like aluminum alloys, rigid clamping can easily cause surface depressions in thin-walled parts and localized stress concentrations in thick-walled parts, even leading to workpiece deformation and affecting product accuracy. Furthermore, when the rear end cover flips with the fixture, uneven force distribution can easily cause workpiece center shift or wobbling, reducing machining positioning accuracy and increasing the scrap rate.

[0004] In view of this, we propose a positioning and flipping fixture for aluminum alloy rear end caps of new energy vehicles. Utility Model Content

[0005] The purpose of this utility model is to provide a positioning and flipping fixture for aluminum alloy rear end caps of new energy vehicles. This positioning and flipping fixture solves the problem that traditional positioning and flipping fixtures, due to their fixed clamping point positions, cannot adapt to the irregular inner wall contour of the rear end cap, resulting in uneven clamping force, easy deformation of aluminum alloy workpieces, and center offset during flipping, which affects processing accuracy and scrap rate.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A positioning and flipping fixture for an aluminum alloy rear end cover of a new energy vehicle includes a movable base. A working platform is mounted on the top of the movable base, and a clamping mechanism is mounted on the working platform. The clamping mechanism includes a support frame, on which a stepper motor is fixedly connected. The output shaft of the stepper motor is fixedly connected to a Y-shaped support arm for driving the Y-shaped support arm to rotate along a longitudinal axis. Two support seats are symmetrically arranged on the Y-shaped support arm. A hollow input tube is rotatably connected to the inner wall of the right support seat. A positioning input tube is rotatably connected to the right side of the hollow input tube. The positioning input tube is used to input high-pressure air into the hollow input tube, and the hollow input tube is located away from the positioning input tube. One end of the input tube is fixedly connected to an annular hollow block, and the end of the annular hollow block away from the positioning input tube is fixedly connected to a hollow output tube. The outer wall of the hollow output tube is rotatably connected to the support base on the left side. Several hollow sealing columns are connected in a cylindrical array on the inner wall of the annular hollow block. A guide rod is slidably connected to the inner wall of the hollow sealing column. A piston block is fixedly connected to one end of the guide rod, and a flexible ball is fixedly connected to the other end of the guide rod. The piston block is piston-connected to the inner wall of the hollow sealing column, and the flexible ball is located outside the hollow sealing column. The end of the hollow output tube away from the annular hollow block is connected to a sealing mechanism for blocking the hollow output tube.

[0008] Preferably, a conveyor belt is provided on the top of the work platform for transporting workpieces.

[0009] Preferably, a side connecting block is provided on the side of the support base, and the positioning input pipe is fixed to the side connecting block of the support base to fix the positioning input pipe and facilitate the connection of the external high-pressure air connection pipe.

[0010] Preferably, the sealing mechanism includes a hollow column, which is fixedly connected to the hollow output pipe. The outer wall of the hollow column has a guide groove and a scale. A through-hole annular block is fixedly connected to the inner wall of the hollow column. A fixed disc is fixedly connected to the inner wall of the end of the hollow column away from the hollow output pipe. A screw is threaded onto the fixed disc, and a movable disc is rotatably connected to the screw. The movable disc is slidably connected to the guide groove. A sealing block is slidably connected to the inner wall of the guide groove, and a return spring is connected between the sealing block and the movable disc.

[0011] Preferably, one end of the return spring is fixedly connected to the sealing block, and the other end of the return spring is fixedly connected to the movable disc.

[0012] Preferably, the screw is provided with a rotating handle disc for conveniently driving the screw to rotate.

[0013] Preferably, the two ends of the return spring are detachably connected to the movable disc and the sealing block, respectively. By disassembling the return spring, springs of different stiffness can be replaced to adapt to different clamping requirements.

[0014] By employing the above technical solution, this utility model provides a positioning and flipping fixture for an aluminum alloy rear end cover of a new energy vehicle. It possesses at least the following beneficial effects:

[0015] 1. This utility model, by setting up a clamping mechanism, can utilize several hollow sealing columns distributed in a cylindrical array on the inner wall of the annular hollow block, in conjunction with a guide rod and flexible balls to form a multi-point clamping structure. When high-pressure air pushes the piston block to extend the guide rod, the flexible balls at different positions can adaptively adjust their extension length according to the actual contour of the inner wall of the rear end cover. The flexible balls at the protrusions extend shorter after being obstructed, while those at the recesses extend longer, realizing multi-point flexible clamping of irregular rear end covers. This avoids workpiece deformation caused by rigid clamping and ensures that the rear end cover maintains its center positioning accuracy during the flipping process, preventing offset or shaking caused by uneven clamping force, and meeting the flipping operation requirements during the processing of aluminum alloy rear end covers.

[0016] 2. This utility model, through the setting of a sealing mechanism, can achieve dynamic balance adjustment of air pressure through structures such as hollow column, screw, movable disc, return spring and sealing block. When the system air pressure is too high, the high-pressure air can push the sealing block to overcome the preload of the return spring to exhaust air. After the air pressure drops, the return spring immediately pushes the sealing block to re-fit the through hole ring block to restore the seal. The system air pressure is maintained stable through the cycle of "overpressure exhaust - automatic resealing". At the same time, the preload of the return spring can be adjusted by rotating the screw. Clockwise rotation increases the preload to improve the air pressure threshold and adapt to workpieces with better rigidity, while counterclockwise rotation decreases the preload to adapt to thin-walled and easily deformable workpieces. This achieves flexible adjustment of the clamping force, which not only ensures stable clamping of thick-walled parts, but also prevents overpressure deformation of thin-walled parts, improves the adaptability of the fixture to diverse processing scenarios, and ensures the positioning accuracy and clamping reliability of the rear end cover during the flipping process. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the present invention, form part of this application:

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the conveyor belt structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the support frame of this utility model;

[0021] Figure 4This is a schematic diagram of the structure of the annular hollow block of this utility model;

[0022] Figure 5 This is a structural schematic diagram of a cross-section of the annular hollow block of this utility model;

[0023] Figure 6 This is a schematic diagram of the cross-section of the hollow sealing column of this utility model;

[0024] Figure 7 This is a schematic diagram of the hollow column structure of this utility model;

[0025] Figure 8 This is a structural schematic diagram of the cross-section of the hollow column of this utility model.

[0026] In the diagram: 1. Moving seat; 2. Working platform; 3. Conveyor belt; 4. Clamping mechanism; 41. Support frame; 42. Stepper motor; 43. Y-shaped support arm; 44. Support base; 45. Hollow input pipe; 46. Positioning input pipe; 47. Ring-shaped hollow block; 48. Hollow output pipe; 49. Hollow sealing column; 410. Guide rod; 411. Piston block; 412. Flexible ball; 5. Sealing mechanism; 51. Hollow column; 52. Guide groove; 53. Scale; 54. Through-hole ring block; 55. Fixed disc; 56. Screw; 57. Movable disc; 58. Return spring; 59. Sealing block. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figure 1 - Figure 8As shown, this utility model provides a technical solution: a positioning and flipping fixture for an aluminum alloy rear end cover of a new energy vehicle, including a movable base 1, a working platform 2 on the top of the movable base 1, and a clamping mechanism 4 on the working platform 2. The clamping mechanism 4 includes: a support frame 41, a stepper motor 42 fixedly connected to the support frame 41, a Y-shaped support arm 43 fixedly connected to the output shaft of the stepper motor 42 for driving the Y-shaped support arm 43 to rotate along the longitudinal axis, two support seats 44 symmetrically arranged on the Y-shaped support arm 43, a hollow input pipe 45 rotatably connected to the inner wall of the right support seat 44, and a positioning input pipe 46 rotatably connected to the right side of the hollow input pipe 45 for inputting high-pressure air. Air enters the hollow input pipe 45. An annular hollow block 47 is fixedly connected to one end of the hollow input pipe 45 away from the positioning input pipe 46. A hollow output pipe 48 is fixedly connected to one end of the annular hollow block 47 away from the positioning input pipe 46. The outer wall of the hollow output pipe 48 is rotatably connected to the left support base 44. Several hollow sealing columns 49 are connected in a cylindrical array on the inner wall of the annular hollow block 47. A guide rod 410 is slidably connected to the inner wall of the hollow sealing column 49. A piston block 411 is fixedly connected to one end of the guide rod 410. A flexible ball 412 is fixedly connected to the other end of the guide rod 410. The piston block 411 is piston-connected to the inner wall of the hollow sealing column 49. The flexible ball 412 is located outside the hollow sealing column 49.

[0029] In this embodiment, the end of the hollow output pipe 48 away from the annular hollow block 47 is connected to a sealing mechanism 5 for blocking the hollow output pipe 48. The movable seat 1 supports the working platform 2, and the working platform 2 carries the clamping mechanism 4. The support frame 41 of the clamping mechanism 4 fixes the stepper motor 42. The output shaft of the stepper motor 42 drives the Y-shaped support arm 43 to rotate around the longitudinal axis to realize the flipping function of the rear end cover. The support seats 44 symmetrically arranged on the Y-shaped support arm 43 respectively rotate to support the hollow input pipe 45 on the right and the hollow output pipe 48 on the left, so that the pipes rotate with the Y-shaped support arm 43 around the transverse axis. The positioning input pipe 46 is connected to the right end of the hollow input pipe 45 and inputs high-pressure air. The left end of the hollow input pipe 45 is fixedly connected to the annular hollow block 47. High-pressure air is transmitted to the interior of the annular hollow block 47. The left end of the annular hollow block 47 is fixedly connected to the hollow output pipe 48, and the hollow sealing columns 49 distributed in a cylindrical array on the inner wall are connected to the interior of the annular hollow block 47. The piston block 411 inside the hollow sealing column 49 slides along the inner wall under the action of high-pressure air and pushes the guide rod 410. The guide rod 410 drives the flexible ball 412 at the outer end to extend and elastically press against the rear end cover to achieve positioning and clamping. Several hollow sealing columns 49 are distributed in a cylindrical array on the inner wall of the annular hollow block 47. Each hollow sealing column 49 is equipped with a guide rod 410 and a flexible ball 412, forming a multi-point clamping structure evenly distributed along the circumference. The circumferential positioning is achieved by multiple flexible balls 412 contacting the rear end cover from different radial positions.

[0030] Furthermore, when high-pressure air is input through the positioning input pipe 46, the high-pressure air enters the annular hollow block 47 through the hollow input pipe 45 and is distributed to each hollow sealing column 49, pushing the piston block 411 to extend the guide rod 410. Due to machining errors or non-perfectly circular structures in the rear end cover, the resistance encountered by the flexible balls 412 at different positions when contacting the rear end cover is different, resulting in differences in the extension length of each guide rod 410—the guide rod 410 extends shorter when the flexible ball 412 at the protrusion is obstructed, while the flexible ball 412 at the concave position can extend longer. Through this adaptive adjustment, multiple flexible balls 412 can be pressed together with lengths that conform to the actual contour, achieving multi-point flexible clamping of the irregular rear end cover, thus avoiding workpiece deformation caused by rigid clamping. This ensures that the rear end cover maintains its center positioning accuracy during the flipping process, preventing offset or shaking caused by uneven clamping force. The end of the hollow output pipe 48 away from the annular hollow block 47 is connected to the sealing mechanism 5. The sealing mechanism 5 maintains stable air pressure in the system by blocking the hollow output pipe 48, ensuring that the flexible ball 412 continuously and reliably clamps the rear end cover. The whole system realizes the functions of precise positioning, stable clamping and flipping of the rear end cover, meeting the needs of flipping operation during the processing of aluminum alloy rear end covers. The top of the work platform 2 is equipped with a conveyor belt 3 for workpiece transmission. The side of the support base 44 is equipped with a side connecting block. The positioning input pipe 46 is fixed to the side connecting block of the support base 44 to fix the positioning input pipe 46 and facilitate the connection of the external high-pressure air connection pipe.

[0031] Furthermore, the sealing mechanism 5 includes a hollow column 51, which is fixedly connected to the hollow output pipe 48. A guide groove 52 is formed on the outer wall of the hollow column 51, and a scale 53 is provided on the outer wall of the hollow column 51. A through-hole annular block 54 is fixedly connected to the inner wall of the hollow column 51. A fixed disc 55 is fixedly connected to the inner wall of the end of the hollow column 51 away from the hollow output pipe 48. A screw 56 is threaded onto the fixed disc 55, and a movable disc 57 is rotatably connected to the screw 56. The movable disc 57 is slidably connected to the guide groove 52, and a sealing block 59 is slidably connected to the inner wall of the guide groove 52. A return spring 58 connects block 59 and movable disc 57. Hollow column 51 is fixedly connected to hollow output pipe 48 to form the support base of sealed mechanism 5. Guide groove 52 on its outer wall is used to limit the axial movement trajectory of movable disc 57. Scale 53 can visually display the positional accuracy of screw 56 adjustment. Through hole annular block 54 on inner wall of hollow column 51 is used to connect the airflow channel between hollow output pipe 48 and each hollow sealing column 49. Fixed disc 55 is fixed to the end of hollow column 51 away from hollow output pipe 48 and threadedly connected to screw 56. Rotating screw 56 can drive it along the axis of fixed disc 55. As the screw 56 moves, the movable disk 57, rotatably connected to it, moves axially in sync with the screw 56 and slides along the guide groove 52. The return spring 58 between the movable disk 57 and the sealing block 59 provides elastic preload. When the rotating screw 56 pushes the movable disk 57 to move along the guide groove 52 toward the through-hole annular block 54, the movable disk 57 compresses the return spring 58 and pushes the sealing block 59 to fit against the through-hole annular block 54 to achieve a seal. At this time, the high-pressure air in the hollow output pipe 48 cannot be discharged through the through-hole annular block 54, and the air pressure in the annular hollow block 47 increases and is synchronously transmitted to the cylindrical array distributed on its inner wall. In a plurality of hollow sealing columns 49, the guide rod 410 and the flexible ball 412 inside each hollow sealing column 49 extend independently under the action of air pressure. When the flexible ball 412 is subjected to a large reaction force due to contact with the protrusion, the air pressure inside the corresponding hollow sealing column 49 increases. The high-pressure air enters the hollow column 51 through the hollow output pipe 48 and pushes the sealing block 59 through the through hole ring block 54 to overcome the preload of the return spring 58, so that some of the high-pressure air is discharged from the gap between the sealing block 59 and the through hole ring block 54. At this time, the overall air pressure of the system is temporarily reduced to avoid local overpressure causing workpiece deformation or excessive compression of the flexible ball 412.

[0032] Furthermore, when the air pressure drops to a level where the return spring 58's force exceeds the remaining air pressure, the return spring 58 immediately pushes the sealing block 59 to re-fit against the through-hole annular block 54, restoring the seal. This causes the system air pressure to rise and remain within the set range, ensuring that the flexible balls 412 at other contact recesses can maintain sufficient extension length for stable clamping. Through this dynamic adjustment of "overpressure venting - automatic resealing," the sealing mechanism 5 can avoid surface damage to the aluminum alloy rear end cover caused by rigid clamping, and also allows multiple flexible balls 412 to adaptively adjust their extension length according to the actual contour of the rear end cover, achieving multi-point pressure-balanced elastic clamping. Simultaneously, it prevents component fatigue or seal failure caused by continuous high pressure, ultimately ensuring the positioning accuracy and clamping reliability of the rear end cover during the flipping process. When the screw 56 is rotated clockwise, the screw 56 moves along the thread of the fixed disc 55 towards the through-hole annular block 54, pushing the movable disc... The compression of the return spring 58 by the disc 57 increases the preload of the return spring 58. At this time, the contact pressure between the sealing block 59 and the through-hole ring block 54 increases, and the system requires higher air pressure to push the sealing block 59 to release air. Correspondingly, the overall air pressure threshold when clamping the rear end cover increases, and the clamping force of the multiple flexible balls 412 on the rear end cover increases. This is suitable for clamping rear end covers with good rigidity or requiring greater clamping force, preventing the workpiece from loosening during the flipping process. When the screw 56 is rotated counterclockwise, the screw 56 drives the movable disc 57 away from the through-hole ring block 54, the preload of the return spring 58 decreases, and the sealing block 59 releases air. The reduced contact pressure between the sealing block 59 and the through-hole annular block 54 allows the system to expel air from the sealing block 59 with only lower air pressure, lowering the overall clamping air pressure threshold and reducing the clamping force of the flexible ball 412. This makes it suitable for clamping thin-walled, easily deformable aluminum alloy rear end caps, preventing overpressure from causing surface dents or deformation of the workpiece. By adjusting the preload of the return spring 58, the system can dynamically adapt to the processing requirements of aluminum alloy rear end caps of different specifications and rigidities, achieving flexible adjustment of the clamping force. This ensures stable clamping of thick-walled parts while preventing deformation of thin-walled parts. Furthermore, by controlling the exhaust threshold, the system can effectively address these issues. Balancing clamping reliability and workpiece protection, the fixture's adaptability to diverse processing scenarios is improved, ensuring that the rear cover remains in a safe and stable positioning state during the flipping process. One end of the return spring 58 is fixedly connected to the sealing block 59, and the other end is fixedly connected to the movable disc 57. The screw 56 is equipped with a rotating handle for easy driving of the screw 56. The two ends of the return spring 58 are detachably connected to the movable disc 57 and the sealing block 59, respectively. By disassembling the return spring 58, springs of different stiffness can be replaced to adapt to different clamping requirements.

[0033] This utility model discloses a positioning and flipping fixture for an aluminum alloy rear end cover of a new energy vehicle. When positioning the aluminum alloy rear end cover of a new energy vehicle is required, a movable base 1 supports a working platform 2 to form the basic frame of the equipment. The working platform 2 carries a clamping mechanism 4 and provides a stable working plane. The support frame 41 of the clamping mechanism 4 fixes and supports a stepper motor 42. The output shaft of the stepper motor 42 drives a Y-shaped support arm 43 to rotate around a longitudinal axis to achieve the flipping function of the rear end cover. The support seats 44 symmetrically arranged on the Y-shaped support arm 43 respectively rotate to support the hollow input tube 45 on the right and the hollow output tube 48 on the left, so that the tubes rotate synchronously around a transverse axis with the Y-shaped support arm 43, positioning the input tube 46. The high-pressure air is connected to the right end of the hollow input pipe 45 and inputs high-pressure air. The high-pressure air is transmitted to the interior of the annular hollow block 47 through the left end of the hollow input pipe 45. The annular hollow block 47 distributes the high-pressure air to several hollow sealing columns 49 distributed in a cylindrical array on the inner wall. The piston block 411 inside the hollow sealing column 49 slides along the inner wall under the action of air pressure and pushes the guide rod 410. The guide rod 410 drives the flexible ball 412 at the outer end to extend. Due to possible processing errors or irregular structure of the rear end cover, the resistance encountered by the flexible ball 412 at different positions when in contact is different, causing the extension length of each guide rod 410 to be different. When the flexible ball 412 at the protrusion is blocked, the guide rod 410... The flexible ball 412 in the recessed area extends further out than the hollow tube 48, achieving multi-point flexible clamping through this adaptive adjustment. The end of the hollow output tube 48 furthest from the annular hollow block 47 is connected to the sealing mechanism 5. The hollow column 51 of the sealing mechanism 5 is fixed to the hollow output tube 48. The screw 56 on the fixed disc 55 drives the movable disc 57 to slide along the guide groove 52 via rotation. The movable disc 57 compresses the return spring 58, pushing the sealing block 59 to fit and seal against the through-hole annular block 54. When the system air pressure is too high, the high-pressure air pushes the sealing block 59 to overcome the pre-tightening force of the return spring 58 and release air. After the air pressure decreases, the return spring 58 pushes the sealing block 59 to re-seal, achieving "overpressure discharge." The "air-automatic sealing" system maintains dynamic air pressure balance. Clockwise rotation of screw 56 increases the preload of return spring 58 to improve the system's air pressure threshold, making it suitable for clamping rear end caps with good rigidity. Counterclockwise rotation reduces the preload to adapt to thin-walled, easily deformable workpieces. The entire system achieves precise positioning, adaptive flexible clamping, and stable flipping of the rear end cap through the support of the moving seat 1 to the working platform 2, the flipping transmission from stepper motor 42 to Y-shaped support arm 43, the air pressure drive from positioning input tube 46 to flexible ball 412, and the air pressure adjustment of sealing mechanism 5. This meets the requirements for flipping operations during the processing of aluminum alloy rear end caps, prevents deformation of rigid clamping, and ensures positioning accuracy during flipping.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A positioning and flipping fixture for an aluminum alloy rear end cover of a new energy vehicle, comprising a movable base (1), characterized in that: The top of the movable seat (1) is provided with a working platform (2), and the working platform (2) is provided with a clamping mechanism (4), the clamping mechanism (4) including: A support frame (41) is provided, on which a stepper motor (42) is fixedly connected. The output shaft of the stepper motor (42) is fixedly connected to a Y-shaped support arm (43), used to drive the Y-shaped support arm (43) to rotate along a longitudinal axis. Two support seats (44) are symmetrically arranged on the Y-shaped support arm (43). A hollow input pipe (45) is rotatably connected to the inner wall of the right support seat (44). A positioning input pipe (46) is rotatably connected to the right side of the hollow input pipe (45). The positioning input pipe (46) is used to input high-pressure air into the hollow input pipe (45). A ring-shaped hollow block (47) is fixedly connected to the end of the hollow input pipe (45) away from the positioning input pipe (46). A hollow output tube (48) is fixedly connected to one end of the annular hollow block (47) away from the positioning input tube (46). The outer wall of the hollow output tube (48) is rotatably connected to the support seat (44) on the left side. A number of hollow sealing columns (49) are connected in a cylindrical array on the inner wall of the annular hollow block (47). A guide rod (410) is slidably connected to the inner wall of the hollow sealing column (49). A piston block (411) is fixedly connected to one end of the guide rod (410). A flexible ball (412) is fixedly connected to the other end of the guide rod (410). The piston block (411) is piston-connected to the inner wall of the hollow sealing column (49). The flexible ball (412) is located outside the hollow sealing column (49). The hollow output tube (48) is connected to a sealing mechanism (5) at the end away from the annular hollow block (47) for blocking the hollow output tube (48).

2. The positioning and flipping fixture for an aluminum alloy rear end cover of a new energy vehicle according to claim 1, characterized in that: The top of the work platform (2) is provided with a conveyor belt (3) for the transfer of workpieces.

3. The positioning and flipping fixture for an aluminum alloy rear end cover of a new energy vehicle according to claim 1, characterized in that: The side of the support base (44) is provided with a side connecting block. The positioning input pipe (46) is fixed to the side connecting block of the support base (44) to fix the positioning input pipe (46) and facilitate the connection of the external high-pressure air connection pipe.

4. The positioning and flipping fixture for an aluminum alloy rear end cover of a new energy vehicle according to claim 1, characterized in that: The sealing mechanism (5) includes a hollow column (51), which is fixedly connected to the hollow output pipe (48). The outer wall of the hollow column (51) is provided with a guide groove (52) and a scale (53) is provided on the outer wall of the hollow column (51). A through-hole ring block (54) is fixedly connected to the inner wall of the hollow column (51). A fixed disc (55) is fixedly connected to the inner wall of the end of the hollow column (51) away from the hollow output pipe (48). A screw (56) is threadedly connected to the fixed disc (55). A movable disc (57) is rotatably connected to the screw (56). The movable disc (57) is slidably connected to the guide groove (52). A sealing block (59) is slidably connected to the inner wall of the guide groove (52). A return spring (58) is connected between the sealing block (59) and the movable disc (57).

5. A positioning and flipping fixture for an aluminum alloy rear end cover of a new energy vehicle according to claim 4, characterized in that: One end of the return spring (58) is fixedly connected to the sealing block (59), and the other end of the return spring (58) is fixedly connected to the movable disc (57).

6. The positioning and flipping fixture for an aluminum alloy rear end cover of a new energy vehicle according to claim 4, characterized in that: The screw (56) is provided with a rotating handle disc for conveniently driving the screw (56) to rotate.

7. A positioning and flipping fixture for an aluminum alloy rear end cover of a new energy vehicle according to claim 4, characterized in that: The two ends of the return spring (58) are detachably connected to the movable disc (57) and the sealing block (59) respectively. By disassembling the return spring (58), springs with different stiffness can be replaced to adapt to different clamping requirements.

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