A seesaw type reverse mechanism

Abstract

This invention discloses a seesaw-type reversing mechanism, belonging to the technical field of pressing, molding, and flanging equipment. The invention utilizes a support plate whose bottom surface slides into contact with the base via a first arc surface, and whose top surface slides into contact with the lower pressure block and the lifting block via two rows of second arc surfaces. Compared to traditional planar or inclined surface contact methods, arc surface contact can form a superior line contact or narrow surface contact state during the oscillation process, significantly reducing the contact area and thus lowering sliding friction. When the drive assembly drives the lower pressure block to press down, the downward force is transmitted to the support plate via the second arc surface. The support plate oscillates around the first arc surface, and then transmits the motion to the lifting block via the other side of the second arc surface. Due to the significant reduction in frictional resistance from the sliding contact of multiple arc surfaces, the transmission loss of driving force is reduced, and the lifting action is more sensitive and smooth. Even if the workpiece to be flanged is heavy, reliable lifting force output can be guaranteed.

Description

Technical Field

[0001] This invention relates to the field of pressing and molding flanging equipment, specifically to a seesaw-type reverse mechanism. Background Technology

[0002] In the pressing and flanging process, it is often necessary to lift the workpiece to be flanged (such as automotive sheet metal parts, metal sheets, etc.) from a low position to a high flanging station in order to perform subsequent pressing and flanging operations. The function of lifting the workpiece to be flanged is usually achieved by a reversing mechanism, that is, by using the downward movement of the lower pressure block, which is converted into the upward movement of the lifting block through the transmission mechanism, thereby lifting the workpiece.

[0003] In existing technologies, the reversing mechanism used in pressing and die-forming flanging equipment is mostly an inclined surface contact type reversing mechanism. For example... Figure 1 As shown, the working principle of this type of mechanism is as follows: the lower end of the pressure block is provided with an inclined surface, and one end of the seesaw is provided with a matching inclined surface. When the pressure block moves downward, the two inclined surfaces come into contact with each other and slide relative to each other, converting the downward movement of the pressure block into the upward movement of the other end of the seesaw, thereby driving the lifting block to lift the workpiece to be flipped upward.

[0004] However, this type of inclined surface contact reversing mechanism has the following technical problems in practical use: First, in the process of lifting the workpiece to be flanged using the inclined surface contact method, the inclined surface of the lower pressure block and the inclined surface of the seesaw component are in surface contact, resulting in a large contact area and thus a large sliding friction. When the weight of the workpiece to be flanged is large, the friction force that needs to be overcome increases accordingly, leading to insufficient lifting force, slow lifting action, and even jamming or incomplete lifting.

[0005] Secondly, during frequent lifting operations, the inclined contact area is subjected to significant pressure and sliding friction for extended periods, resulting in severe wear. This leads to increased clearance, decreased lifting accuracy, and affects the consistency of flanging quality.

[0006] Third, the metal debris generated by the inclined surface wear is difficult to remove, which will further aggravate friction and wear, shorten the service life of the mechanism, and increase the equipment maintenance cost.

[0007] Therefore, how to reduce the contact friction of the reverse mechanism in the pressing and flanging equipment when lifting the workpiece to be flanged, so as to make the lifting action smoother, more stable and precise, is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0008] To address the aforementioned problems, this invention provides a seesaw-type reversing mechanism to solve the technical problems of high friction, easy wear, and unsmooth lifting action in existing pressing and die-forming flanging equipment using inclined surface contact reversing mechanisms.

[0009] To achieve the above objectives, the present invention provides the following solution: A seesaw-type reversing mechanism includes a base, a seesaw assembly disposed on the base, a pressing block and a lifting block disposed at both ends of the seesaw assembly, and a driving assembly for driving the pressing block to press down. The seesaw assembly includes a support plate, a downward-facing first arc surface disposed on the bottom surface of the support plate, and an upward-facing second arc surface disposed on the top surface of the support plate. Two rows of the second arc surfaces are arranged side by side at intervals. The pressing block is disposed on the second arc surface of one row, and the lifting block is disposed on the second arc surface of the other row. The areas of contact between the pressing block and the lifting block and the second arc surface are adapted and slidably contacted. The base is adapted and slidably contacted in the area of ​​contact with the first arc surface. The lifting block is used to lift the workpiece to be flipped.

[0010] Preferably, a brass bearing is provided in the area where the first arc surface contacts the base, and the bearings are evenly spaced along the circumference of the first arc surface.

[0011] Preferably, the radius of the arc of the bearing bush is the same as the radius of the arc of the first arc surface.

[0012] Preferably, the contact surface of the bearing bush is provided with multiple oil reservoirs or inlaid with graphite pillars.

[0013] Preferably, at least three seesaw assemblies are provided, and they are evenly spaced along the length of the lower pressure block.

[0014] Preferably, it also includes a limiting box with one open side, wherein the base, the seesaw assembly, the pressing block and the lifting block are all disposed in the limiting box, and the side walls of the pressing block and the lifting block are clearance-fitted with the inner wall of the limiting box.

[0015] Preferably, the pressing block has a cavity for accommodating the drive assembly, and the output end of the drive assembly has a connecting block connected to the inner wall of the cavity.

[0016] Preferably, the driving component is a nitrogen spring.

[0017] Preferably, the upper end surface of the lifting block is provided with an elastic buffer pad to buffer the impact when it comes into contact with the workpiece to be flanged.

[0018] Preferably, the axes of the first arc surface and the second arc surface are parallel to each other.

[0019] The present invention achieves the following technical effects compared to the prior art: This invention utilizes a support plate whose bottom surface slides into contact with the base via a first arc surface, and whose top surface slides into contact with the lower pressure block and the lifting block via two rows of second arc surfaces. Compared to traditional planar or inclined surface contact methods, arc surface contact can form a superior line contact or narrow surface contact state during oscillation, significantly reducing the contact area and thus lowering sliding friction. When the drive assembly drives the lower pressure block to press down, the downward force is transmitted to the support plate via the second arc surface. The support plate oscillates around the first arc surface, and then transmits the motion to the lifting block via the other side of the second arc surface. Due to the significant reduction in frictional resistance from multiple arc surface sliding contacts, the transmission loss of driving force is reduced, and the lifting action is more sensitive and smooth. Even if the workpiece to be flanged is heavy, reliable lifting force output can be guaranteed. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the internal perspective structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the internal perspective structure of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the cooperation of multiple seesaw-type reversing mechanisms of the present invention; The components include: 1. Pressing block; 2. Lifting block; 3. Limiting box; 4. Base; 5. First arc surface; 6. Second arc surface; 7. Bearing; 8. Receiving cavity; 9. Drive assembly; 10. Connecting block. Detailed Implementation

[0022] 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 some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] This invention provides a seesaw-type reversing mechanism to solve the technical problems of high friction, easy wear, and unsmooth lifting action of the inclined surface contact type reversing mechanism in the existing pressing and pressing mold flanging equipment when lifting the workpiece to be flanged.

[0024] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] refer to Figures 1 to 2 A seesaw-type reversing mechanism includes a base 4, a seesaw assembly mounted on the base 4, a pressing block 1 and a lifting block 2 mounted at both ends of the seesaw assembly, and a driving assembly 9 for driving the pressing block 1 to press down. The seesaw assembly includes a support plate, with a downward-facing first arc surface 5 on the bottom surface of the support plate and an upward-facing second arc surface 6 on the top surface of the support plate. Two rows of second arc surfaces 6 are arranged side by side at intervals. The pressing block 1 is mounted on one row of second arc surfaces 6, and the lifting block 2 is mounted on the other row of second arc surfaces 6. The areas where the pressing block 1 and the lifting block 2 contact the second arc surfaces 6 are adapted to each other and are in sliding contact. The area where the base 4 contacts the first arc surface 5 is adapted to each other and is in sliding contact. The lifting block 2 is used to lift the workpiece to be flipped. Specifically, when the driving assembly 9 presses down the pressing block 1, the pressing block 1 slides downward along one row of second arc surfaces 6, forcing the support plate to swing around the contact area between the first arc surface 5 and the base 4, thereby driving the lifting block 2 on the other row of second arc surfaces 6 to move upward. The "lifting" action, achieved by "pressing down," reverses the direction of motion, making it suitable for flanging applications where space is limited or upward force is required. The pressing block 1, lifting block 2, and the second arc surface 6, as well as the base 4 and the first arc surface 5, all utilize compatible arc-shaped sliding contacts. This avoids stress concentration caused by rigid hinges, reduces the coefficient of sliding friction, ensures smooth movement, and extends service life. The double-arc surface (first arc surface 5 and second arc surface 6) structure allows the pressing block 1 and lifting block 2 to automatically adjust their contact positions along the arc surface when the bearing plate swings, compensating for minor deviations caused by manufacturing or assembly and preventing jamming. The pressing block 1 and lifting block 2 are respectively positioned on two rows of parallel, spaced second arc surfaces 6, forming a stable couple support that ensures symmetrical force distribution on the bearing plate and prevents lateral overturning. Meanwhile, the arc-shaped contact can withstand larger vertical loads, which is beneficial for outputting a larger lifting force for flanging metal or plastic workpieces. The entire reversing mechanism is integrated on a base 4, eliminating the need for complex linkages or gear transmissions, occupying little space, and facilitating direct installation and use in automated production lines, stamping dies, fixtures, and other equipment. In this invention, the bottom surface of the support plate slides in contact with the base 4 through the first arc surface 5, and the top surface of the support plate slides in contact with the lower pressure block 1 and the lifting block 2 through two rows of second arc surfaces 6 respectively. Compared with traditional planar or inclined contact methods, the arc-shaped contact can form a better line contact or narrow surface contact state during the swinging process, significantly reducing the contact area and thus reducing sliding friction. When the drive assembly 9 drives the lower pressure block 1 to press down, the downward force is transmitted to the support plate through the second arc surface 6. The support plate swings around the first arc surface 5, and then the motion is transmitted to the lifting block 2 through the other side of the second arc surface 6. Because the frictional resistance of the multiple arc-shaped sliding joints is greatly reduced, the transmission loss of driving force is reduced, and the lifting action is more sensitive and smooth. Even if the workpiece to be flipped is heavy, reliable lifting force output can be guaranteed.

[0026] refer to Figure 1 or Figure 2 A brass bearing 7 is provided in the area where the first arc surface 5 contacts the base 4. The bearings 7 are evenly spaced along the circumference of the first arc surface 5. Specifically, the bearings 7 are strip-shaped or block-shaped. The back of the bearing 7 is fixedly connected to the base 4 or embedded in the arc-shaped mounting groove of the base 4. A chip removal gap is left between adjacent bearings 7 to accommodate wear particles or external dust. The bearings 7 can be set as one or more continuous segments in the axial direction of the first arc surface 5 to accommodate bearing plates of different lengths. By providing brass bearings 7 in the contact area between the base 4 and the first arc surface 5, and arranging them along the circumference of the first arc surface 5... The evenly spaced arrangement of the bearing bushes not only utilizes the excellent self-lubricating and anti-seize properties between the brass and steel bearing plates to significantly reduce the coefficient of sliding friction and wear rate, making the seesaw assembly swing more sensitively and smoothly, but also ensures that the bearing plates are evenly stressed during swinging and avoid localized wear. Furthermore, the evenly spaced arrangement of the bearing bushes 7 not only ensures uniform force distribution on the bearing plates during swinging and avoids localized wear, but also forms a natural chip removal channel, enabling timely removal of wear debris or external dust. This effectively prevents scratches or jamming on the contact surfaces, thereby significantly improving the reliability and service life of the mechanism under frequent operation or harsh conditions. It also facilitates the individual replacement of worn bearing bushes 7 during subsequent maintenance, reducing maintenance costs.

[0027] Furthermore, the radius of the arc of the bearing bush 7 is the same as that of the first arc surface 5; this aims to achieve precise fit and uniform load-bearing between the bearing bush 7 and the first arc surface 5. The same radius ensures that the inner arc surface of the bearing bush 7 and the first arc surface 5 form an ideal line contact or surface contact, avoiding local stress concentration or gap wobble caused by curvature mismatch. The thickness of the bearing bush balances the structural strength, wear resistance, and assembly flexibility of the bearing bush 7—too thin and it is prone to deformation or wear too quickly, too thick and it occupies space and reduces heat dissipation and chip removal capacity. This thickness and radius matching design together ensures low friction, high stability, and long-term reliability of the load-bearing plate during oscillation.

[0028] Furthermore, the contact surface of the bearing bush 7 is provided with multiple oil reservoirs or embedded with graphite pillars; this achieves a long-term, stable, low-friction sliding fit between the bearing bush 7 and the first arc surface 5. The oil reservoirs can store grease or lubricating oil during assembly and gradually release it to the contact interface during the swinging of the bearing plate, forming a continuous oil film and reducing boundary friction. The graphite pillars utilize the properties of solid lubricants to reduce the coefficient of friction and prevent seizing even under harsh conditions such as lack of oil, high load, or dust intrusion through the self-lubricating effect of graphite particles. Both effectively reduce the wear rate between the bearing bush 7 and the arc surface, avoid temperature rise or movement jamming due to insufficient lubrication, thereby extending the maintenance cycle and improving the operational reliability of the mechanism under frequent start-stop or heavy load conditions.

[0029] refer to Figure 1The seesaw components can be combined according to the length of the usage scenario. For example, if you flip up a short section of the side about 20 centimeters long, the usage scenario is very short, and only one set of seesaws can be used. If you flip up a section of the side that is nearly 1 meter long, the usage scenario is very long, and multiple sets of seesaws can be arranged side by side.

[0030] refer to Figure 1 It also includes a limiting housing 3 with one open side. The base 4, seesaw assembly, pressing block 1, and lifting block 2 are all disposed inside the limiting housing 3. The side walls of the pressing block 1 and the lifting block 2 are clearance-fitted with the inner wall of the limiting housing 3. Specifically, the limiting housing 3 has at least one open surface for the driving end of the pressing block 1 or the working end of the lifting block 2 to extend or approach the external workpiece. The clearance of the single side of the clearance fit is 0.1mm to 1.0mm, and the specific value depends on the operation of the pressing block 1 and the lifting block 2. The stroke and thermal expansion are determined; the side walls of the lowering block 1 and the lifting block 2 form a clearance fit with the inner wall of the limiting box 3, limiting their offset and rotation in the direction perpendicular to the movement direction, ensuring that the lowering block 1 only performs an approximately linear downward pressing movement and the lifting block 2 only performs an approximately linear lifting movement, thereby avoiding lateral movement that may be caused by the swing of the seesaw assembly and improving the lifting position accuracy; the base 4, seesaw assembly, lowering block 1 and lifting block 2 are all integrated into a limiting box 3, forming This design integrates all moving parts into a single, enclosed or semi-enclosed functional module, facilitating overall installation, transportation, and integration with automated production lines, thus reducing the need for external auxiliary guiding mechanisms. This embodiment integrates all moving parts within a single-sided open limiting housing 3, with a clearance fit between the side walls of the lowering block 1 and the lifting block 2 and the inner wall of the housing. This enables precise guidance and anti-swaying of the movement of the lowering block 1 and the lifting block 2, preventing lateral movement during the swing of the seesaw assembly. Simultaneously, the housing provides physical protection, reducing the entry of dust, debris, and other contaminants into the sliding contact surface and preventing accidental contact with moving parts. Furthermore, the limiting housing 3 can withstand the lateral force generated when the workpiece is flanged, protecting the curved surface and bearing 7 from scratches. The open surface and clearance fit design also facilitate component disassembly and maintenance, compensate for thermal expansion, and reduce overall assembly precision requirements. Therefore, while improving lifting position accuracy, equipment safety, and environmental adaptability, it also achieves compact integration and low-cost manufacturing.

[0031] refer to Figure 1The lower pressure block 1 has a cavity 8 for accommodating the drive assembly 9. The output end of the drive assembly 9 is connected to a connecting block 10, which is connected to the inner wall of the cavity 8. When the drive assembly 9 performs a driving action, its output end drives the connecting block 10 to move linearly in the vertical direction (up and down). Since the connecting block 10 is connected to the inner wall of the cavity 8, the movement of the connecting block 10 is directly transmitted to the lower pressure block 1, thereby causing the entire lower pressure block 1 to move synchronously up and down. Furthermore, the cavity 8 is cylindrical, square, or irregularly shaped, and its inner wall is provided with connecting holes, threaded holes, slots, keyways, or retaining ring slots to form a reliable connection with the connecting block 10. This invention achieves direct and efficient transmission of the drive assembly 9 to the lower pressure block 1 by setting a receiving cavity 8 inside the lower pressure block 1 and directly connecting the connecting block 10 of the output end of the drive assembly 9 to the inner wall of the receiving cavity 8. This shortens the force flow path and improves the response speed and transmission efficiency. At the same time, this integrated design makes the structure more compact, saves installation space, and uses the receiving cavity 8 to form physical protection for the output end of the drive assembly 9, preventing damage from dust, collisions, etc. The fit between the connecting block 10 and the receiving cavity 8 also has good centering, reducing assembly difficulty and facilitating the absorption of impact and vibration by adding buffer components, thereby improving operational stability. In addition, this structure is easy to maintain, replace, and adjust the stroke, and can be adapted to various drive methods such as cylinders, hydraulic cylinders, and linear motors. Thus, while improving transmission performance, reliability, and adaptability, it also takes into account compact layout and low-cost maintenance.

[0032] refer to Figure 1The drive assembly 9 is a nitrogen spring with a built-in reset function. Specifically, it is a self-resetting nitrogen spring filled with high-pressure nitrogen gas, possessing an automatic reset function: when the external force is removed, the piston rod of the nitrogen spring can automatically return to its initial extended or compressed state by relying on the internal gas pressure. The specific reset direction is determined according to the installation method. When the drive assembly 9 applies an external force to compress the nitrogen spring, the lower pressure block 1 moves downward; after the external force is removed, the nitrogen spring automatically extends, pushing the lower pressure block 1 upward to reset. When there is no external force, the nitrogen spring is in the extended state, keeping the lower pressure block 1 in the upper position. When it is necessary to press down, the external force overcomes the elasticity of the nitrogen spring and compresses it. After the external force is removed, the nitrogen spring automatically extends, driving the lower pressure block 1 to return to its original position. This invention uses a nitrogen spring with a built-in reset function as the driving component 9, which can automatically achieve return reset after driving the lower pressure block 1 to complete the pressing action. There is no need to set up an additional reset spring, cylinder return air circuit or motor reversal mechanism, which significantly simplifies the overall structure, reduces the number of parts and installation space, and reduces manufacturing costs and maintenance difficulty. At the same time, the nitrogen spring has the advantages of stable and adjustable reset force, smooth and shock-free operation, fast response speed, suitable for high-frequency operation, long service life (more than one million times without maintenance), and automatic reset to a safe position when pressure is lost or power is cut off. This not only improves the operational reliability and safety of the mechanism, but also enhances its adaptability to different workpieces and working conditions.

[0033] Furthermore, the upper surface of the lifting block 2 is provided with an elastic buffer pad to buffer the impact when it comes into contact with the workpiece to be flanged, absorb the instantaneous contact impact generated when the lifting block 2 lifts the workpiece to be flanged upward, and avoid rigid collisions that may cause indentations, scratches or local deformation on the workpiece surface, thereby protecting the appearance quality and dimensional accuracy of the workpiece. At the same time, the buffer pad can reduce the reverse transmission of impact load to the seesaw assembly and drive assembly 9, reduce fatigue wear of internal sliding contact surfaces (such as the arc surface and the bearing 7), and extend the overall life of the mechanism. In addition, the elastic buffer pad can also compensate for minor unevenness or parallelism deviations of the bottom surface of the workpiece, so that the lifting block 2 and the workpiece can achieve flexible contact, improve the uniformity of the lifting force and the stability of the flanging process, and reduce the noise generated by the impact, thus improving the working environment.

[0034] Furthermore, the axes of the first and second arc surfaces are parallel to each other, ensuring that the lower pressure block 1 and the lifting block 2 slide smoothly in the same direction during movement, avoiding motion interference or jamming caused by the intersection or misalignment of the arc surface axes. The parallelism of the two axes ensures that the movement trajectories of the lower pressure block 1 and the lifting block 2 are both located in mutually parallel planes when the bearing plate swings, thus guaranteeing the directionality and consistency of force transmission and reducing the wear of lateral force on the sliding contact surface. At the same time, this parallel relationship simplifies the processing and assembly process of the mechanism, making it easy to process two parallel arc surfaces at one time using conventional machine tools (such as planers, grinders, or CNC milling machines), reducing manufacturing costs, and facilitating the precise clearance fit between the lower pressure block 1 and the lifting block 2 and the inner wall of the box within the limiting box 3, thereby improving the motion accuracy and reliability of the entire machine.

[0035] refer to Figure 3 The seesaw-type reversing mechanism of the present invention can be configured in multiple combinations according to actual requirements. Points to note during assembly: After the seesaw-type reversing mechanism is standardized, it is not as strong as before when it forms an integral structure with the mold base. During use, attention must be paid to the balance of the lateral force of the flanging mechanism. The base of the flanging mechanism has a lateral force support key, which should be attached to the outer wall of the seesaw-type reversing mechanism. When the upper flipping blade is very high, there should be a guide plate behind the blade and the lower punch surface to guide and balance the force of the lateral flanging.

[0036] The workflow of this invention is as follows: initial state The drive assembly 9 is in its initial retracted state, with the pressure block 1 in the upper position and the lifting block 2 in the lower position, and the support plate basically horizontal or slightly tilted. At this time, the workpiece to be flanged is located above the lifting block 2, maintaining a set gap or slight contact with the lifting block 2.

[0037] Drive down After receiving the control signal, the drive assembly 9 extends its output end, pushing the connecting block 10 fixed at its end to move forward. Since the connecting block 10 is fixedly connected to the inner wall of the receiving cavity 8 inside the lower pressure block 1, the connecting block 10 directly transmits the driving force to the lower pressure block 1, driving the lower pressure block 1 to move downward.

[0038] seesaw swing When the pressure block 1 moves downward, its bottom surface slides along a row of second arc surfaces 6 on the bearing plate, applying downward pressure to that side of the bearing plate. After the bearing plate is subjected to force, the first arc surface 5 on its bottom surface swings on the bearing bush 7 of the base 4, causing the bearing plate to tilt around the axis of the first arc surface 5.

[0039] Lifting block 2 rises When the support plate swings, the other row of second arc surfaces 6 (located on the raised side) lifts the lifting block 2 upwards. The side wall of the lifting block 2 maintains a clearance fit with the inner wall of the limiting box 3 to ensure that the lifting block 2 rises smoothly in the vertical direction and avoids swaying. During the upward movement of the lifting block 2, it contacts and lifts the workpiece to be flanged, completing the flanging action.

[0040] Return reset After the flanging is completed, the output end of the drive component 9 retracts, pulling the lower pressure block 1 upward through the connecting block 10. Under the action of gravity and the lifting block 2 (or its connected return spring), the support plate swings in the opposite direction, the lifting block 2 falls back to the initial low position, and the entire mechanism returns to the initial state, ready for the next working cycle.

[0041] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A seesaw-type reversing mechanism, characterized in that, The device includes a base, a seesaw assembly mounted on the base, a pressing block and a lifting block at both ends of the seesaw assembly, and a drive assembly for driving the pressing block downwards. The seesaw assembly includes a support plate with a downward-facing first arc surface on its bottom surface and an upward-facing second arc surface on its top surface. The second arc surfaces are arranged in two rows at intervals. The pressing block is mounted on one row of the second arc surfaces, and the lifting block is mounted on the other row of the second arc surfaces. The areas where the pressing block and the lifting block contact the second arc surfaces are adapted to each other and are in sliding contact. The base is adapted to the area where it contacts the first arc surface and is in sliding contact. The lifting block is used to lift the workpiece to be flanged.

2. The seesaw-type reversing mechanism according to claim 1, characterized in that, The area where the first arc surface contacts the base is provided with a brass bearing, and the bearings are evenly spaced along the circumference of the first arc surface.

3. The seesaw-type reversing mechanism according to claim 2, characterized in that, The radius of the arc of the bearing bush is the same as the radius of the arc of the first arc surface.

4. The seesaw-type reversing mechanism according to claim 3, characterized in that, The contact surface of the bearing bush is provided with multiple oil reservoirs or inlaid with graphite pillars.

5. The seesaw-type reversing mechanism according to claim 1, characterized in that, At least three seesaw components are provided, and they are evenly spaced along the length of the lower pressure block.

6. The seesaw-type reversing mechanism according to claim 1, characterized in that, It also includes a limiting box with one open side, and the base, seesaw assembly, pressing block and lifting block are all disposed in the limiting box. The side walls of the pressing block and the lifting block are clearance-fitted with the inner wall of the limiting box.

7. The seesaw-type reversing mechanism according to claim 1, characterized in that, The pressing block has a cavity for accommodating the drive assembly, and the output end of the drive assembly has a connecting block that is connected to the inner wall of the cavity.

8. The seesaw-type reversing mechanism according to claim 7, characterized in that, The drive component is a nitrogen spring.

9. The seesaw-type reversing mechanism according to claim 1, characterized in that, The upper end face of the lifting block is provided with an elastic buffer pad to buffer the impact when it comes into contact with the workpiece to be flanged.

10. The seesaw-type reversing mechanism according to claim 1, characterized in that, The axes of the first and second arc surfaces are parallel to each other.

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