A flipping mechanism

Abstract

The present invention discloses a flipping mechanism, which includes a base. Two sets of flipping wheels are arranged on the base. The flipping wheels are rotatably connected to the base, and a first pinch roller assembly and a second pinch roller assembly are arranged on the flipping wheels. The first pinch roller assembly or the second pinch roller assembly is controlled to move up and down through a lifting assembly. In addition, belt transmission assemblies are respectively arranged on the first pinch roller assembly and the second pinch roller assembly to realize the transmission of the door panel. Therefore, in addition to completing automatic flipping, the present invention also combines the automatic transmission process of the door panel. It is a flipping mechanism with extremely high automation, completely replacing manual assistance, significantly reducing labor intensity and further improving work efficiency. At the same time, the mechanism controls the start and stop movements of each component in the mechanism through various sensors, ensuring the accuracy of the flipping action. Therefore, it can be connected to an assembly line to cooperate with other processing operations, and has strong comprehensive application performance.

Description

Technical Field

[0001] The present invention relates to the technical field of door processing, and particularly to a flipping mechanism. Background Art

[0002] In door processing, the door frame often needs to go through multiple processing procedures from raw materials to forming and packaging. Among them, when it comes to turning over the door panel or door surface during processing, manual turning over or using corresponding mechanical tools for assistance is generally adopted. However, in the existing door panel turning-over technologies, most of them are inefficient, and their automation degree is low, requiring a certain degree of manual assistance to manually feed the door panel or door frame into the flipping mechanism to achieve turning over. In addition, in some mechanisms, there are more or less differences in the control of turning-over accuracy. When it is necessary to cooperate with other automated processes (flow processing), it is often difficult to accurately cooperate. And this problem is also a common problem faced in door processing. Therefore, there is an urgent need for an auxiliary device with a high degree of automation and significant working efficiency to complete the turning over of the door panel and door frame. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a flipping mechanism.

[0004] The purpose of the present invention is achieved through the following technical solutions:

[0005] A flipping mechanism includes a base. The flipping mechanism includes two sets of flipping wheels that are parallel to each other. The flipping wheels are rotatably connected to the base, and both sets of flipping wheels are perpendicular to the horizontal plane. A transmission device for driving the flipping wheels to rotate is provided on the base; a first connecting frame and a second connecting frame are respectively arranged from top to bottom between the two sets of flipping wheels, and the first connecting frame and the second connecting frame are symmetrically arranged; a first pinch roller assembly and a second pinch roller assembly are arranged between the opposite surfaces of the first connecting frame and the second connecting frame. The first pinch roller assembly and the second pinch roller assembly both include a belt transmission assembly and a roller frame. The belt transmission assembly is arranged on the roller frame, and the transmission directions of the belt transmission assembly in the first pinch roller assembly and the belt transmission assembly in the second pinch roller assembly are opposite. The first pinch roller assembly is connected to the first connecting frame, the second pinch roller assembly is connected to the second connecting frame, and a lifting assembly for controlling the lifting and moving of the first pinch roller assembly or the second pinch roller assembly is provided on the first connecting frame or the second connecting frame.

[0006] In this solution, the flipping mechanism fixedly connects the connecting frame of the pinch roll assembly to the flipping wheel. Through the sliding fit between the flipping wheel and the base, the rotation of the flipping wheel drives the pinch roll assembly, thereby realizing the turning over of the door frame. Compared with the rotation of the pinch roll assembly within the flipping wheel, the rotational structure of this rotational fit relationship in this solution is more stable and can bear a greater flipping mass. At the same time, in this solution, a belt drive assembly is provided on the pinch roll assembly, which greatly facilitates the automatic feeding and discharging of door panels or door frames, etc. The lifting assembly realizes the clamping of the door panel surface by the first pinch roll assembly and the second pinch roll assembly by controlling the lifting of the first pinch roll assembly or controlling the lifting and movement of the second pinch roll assembly, flexibly coordinating with the flipping action of the mechanism. In addition, through the automatic feeding and discharging function of the belt drive assembly located on the pinch roll assembly, this mechanism can also cooperate with other processing procedures of the door panel and be incorporated into the flow production line. Generally speaking, through this solution, this mechanism has remarkable working efficiency in realizing the turning over process of the door panel and door frame, with a high degree of automation, completely replacing manual operations, saving labor costs, and can also be introduced into the corresponding flow production line operation of the door panel and door frame.

[0007] Preferably, a sliding assembly is provided between the two groups of flipping wheels and the base. The sliding assembly includes supports and pulleys symmetrically arranged on both sides of the flipping wheel. The supports are fixedly connected to the base, the pulleys are rotatably connected to the supports, and the flipping wheel is connected to the base through the pulleys. And chutes for cooperating with the pulleys are provided on the outer circumferences of the two groups of flipping wheels. In the cooperation relationship between the flipping wheel and the pulley, there are two ways of arranging the chutes. One is to select large-diameter pulleys and open chutes on the outer circumferences of the pulleys, and the outer circumferences of the flipping wheels cooperate with them; the other is the way provided in this solution. Obviously, the former requires a more complex pulley structure, and at the same time, the structural dimensions of the supports cooperating with the pulleys also need to be adapted to it, inevitably increasing the complexity of the additional structure. While in this solution, the chutes are opened on the flipping wheels, which well avoids the above defects. At the same time, this cooperation relationship is also more firm, and the structural stability is better during the flipping process.

[0008] Preferably, the transmission device includes a motor, a sprocket, a chain, and a connecting seat fixed on the flipping wheel. The motor is fixedly connected to the base, the sprocket is rotatably connected in the support, the chain meshes with the sprocket, and the end of the chain is fixedly connected to the connecting seat located on the flipping wheel. This transmission device drives the flipping wheel to rotate in the form of chain drive. The chain drive has a simple form, strong overload capacity, high transmission efficiency, and a more accurate average transmission ratio. Obviously, it is more suitable compared with gear drive and belt drive. Its accurate transmission ratio is beneficial to the precise control of the flipping angle.

[0009] Preferably, the belt drive assembly includes a conveyor belt and rollers. The rollers are rotatably connected to both ends of the roller frame. A support plate for protecting the flipping of the door panel or door frame is connected inside the roller frame. Although the belt drive can achieve automatic feeding of the door panel and door frame, there are defects. When the pinch roller assembly needs to clamp the door panel, since the conveyor belt is a soft plastic material, the roller frame covered by the conveyor belt needs to complete the clamping. However, the roller frame itself has a high hardness, which may cause certain clamping marks or other damages to the surface of the door panel during the clamping process. In this solution, by providing a support plate on the roller frame and using the support plate to cooperate with the conveyor belt to clamp the door panel, the appearance of the door panel is prevented from being affected.

[0010] Preferably, the lifting assembly includes a plurality of cylinders. The cylinder block of the cylinder is fixed to the first connecting frame, and the piston rod of the cylinder is fixed to the roller frame in the first pinch roller assembly. The lifting assembly in this solution is controlled by cylinders. By utilizing the advantages of stable cylinder stroke, smooth movement, and precise control of the cylinders, the lifting of the first pinch roller assembly is controlled, and it precisely cooperates with other components to ensure the working efficiency of the mechanism.

[0011] Furthermore, a connecting rod equal in number to the cylinders is hinged on the roller frame. One end of each connecting rod away from the roller frame is hinged with a planetary gear. The rotation plane of the planetary gear is perpendicular to the horizontal plane. A balance rod is provided between adjacent planetary gears, and the center of the planetary gear is relatively fixed to the first connecting frame through the balance rod. In the first pinch roller assembly, the unbalanced weight of the first connecting frame caused by the motor of the belt drive assembly results in inconsistent forces on each cylinder, which obviously affects the synchronism of the piston rod movements of each cylinder. As a further preferred supplement to the above solution, this solution eliminates the above defects by driving the synchronous movement of the cylinders through the planetary gears and the balance rod.

[0012] Preferably, displacement sensors are provided on the first pinch roller assembly and the second pinch roller assembly. The displacement sensors in this solution real-time detect the position state of the door panel and door frame to cooperate with the precise control of the flipping mechanism for the flipping of the door panel and door frame.

[0013] Preferably, a set of stoppers is provided on each of the two sets of flipping wheels. The connection line between the stoppers on each set of flipping wheels coincides with the diameter of the flipping wheel and is perpendicular to the first pinch roller assembly and the second pinch roller assembly. A limit seat cooperating with the stoppers is provided on the base, and the limit seat is located at the center of the horizontal projection of the flipping wheel. In this solution, the function of the stoppers is to limit the position, preventing the flipping wheel from continuing to flip "excessively" under the action of inertia after the motor stops rotating, exceeding the flipping angle of 180°.

[0014] Further, a position detection sensor for monitoring the rotation state of the flipping wheel is provided on the base. To cooperate with the stop block in the above solution and simultaneously reduce the inertia of the flipping wheel, this solution uses the position detection sensor to monitor the flipping state of the flipping wheel, and timely adjusts the rotation speed and direction of the motor in the transmission device, so that after the motor stops rotating, the flipping wheel completes a 180° flip and stops stably, avoiding excessive collision between the stop block and the limit seat.

[0015] Further, an anti-collision pad is provided on the stop block. The presence of the anti-collision pad can buffer the collision between the limit seat and the stop block, and reduce the noise and damage generated by the collision.

[0016] The beneficial effects of the present invention are as follows:

[0017] 1. The present invention realizes the automatic feeding and discharging of the flipping mechanism by providing a belt transmission component on the first pinch roller assembly and the second pinch roller assembly, saving labor costs and greatly improving the automation degree.

[0018] 2. In the present invention, an integrated design of the flipping wheel, the connecting frame located thereon, and the pinch roller assembly is adopted, and the flipping of door tools such as door panels or door frames is realized by the rotation of the flipping wheel relative to the base, improving the structural stability and greatly increasing the load capacity that the mechanism can bear for flipping.

[0019] 3. The present invention controls the feeding and discharging during the flipping process of the mechanism and the start and stop movements between components through real-time monitoring by sensors, making the flipping control of the mechanism more precise and efficient.

[0020] 4. Due to its precise control, this mechanism of the present invention can be introduced into the door tool assembly line to cooperate with other processing operations, and has strong comprehensive applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the flipping mechanism;

[0022] Figure 2 It is a partial structural schematic diagram of the flipping mechanism;

[0023] Figure 3 Partial enlarged view of the mechanism.

[0024] In the figure, 1 - base, 2 - second pinch roller assembly, 3 - first pinch roller assembly, 4 - cylinder, 5 - stop block, 6 - flipping wheel, 7 - first connecting frame, 8 - displacement sensor, 9 - transmission device, 10 - sliding component, 11 - second connecting frame, 12 - limit seat, 13 - position detection sensor, 14 - belt transmission component, 15 - roller frame, 16 - connecting rod, 17 - planetary gear, 18 - balance rod. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0026] Embodiment 1

[0027] Please refer to Figure 1 and Figure 2 , a flipping mechanism for processing door appliances (door panels, door frames, etc.), which includes a base 1. Two groups of mutually parallel flipping wheels 6 are arranged on the base 1. At the same time, a sliding assembly 10 is provided between the base 1 and the flipping wheels 6. The flipping wheels 6 form a rotational mating relationship with the base 1 through the sliding assembly 10. Specifically, the sliding assembly 10 is mainly composed of a support and a pulley. The support is fixedly connected to the base 1, and the pulley is rotatably connected to the support. The flipping wheels 6 achieve relative sliding with the base 1 through the pulley. At the same time, a transmission device 9 for providing driving force for the flipping wheels 6 is arranged on the base 1. To ensure the stable force of the structure, both groups of the flipping wheels 6 need to be perpendicular to the horizontal plane, that is, perpendicular to the base 1.

[0028] In addition, two sets of connecting frames are arranged between the two sets of turning wheels 6, namely the first connecting frame 7 and the second connecting frame 11 from top to bottom. Besides being used to fixedly connect the turning wheels 6, they also play a role in connecting other structural components. Specifically, the first connecting frame 7 and the second connecting frame 11 should be symmetrically arranged and are respectively connected to the inner rings of the turning wheels 6. At the same time, a certain distance is reserved between the first connecting frame 7 and the second connecting frame 11, and a pinch roller assembly is installed on the opposite sides of the two. That is, a first pinch roller assembly 3 is arranged on the bottom surface of the first connecting frame 7, and a second pinch roller assembly 2 is arranged on the top surface of the second connecting frame 11. Both the first pinch roller assembly 3 and the second pinch roller assembly 2 are composed of a belt drive assembly 14 and a roller frame 15. The roller frame 15 is fixedly connected to the pinch roller assembly, and the belt drive assembly 14 is installed on the roller frame 15. The driving directions of the belt drive assemblies 14 in the first pinch roller assembly 3 and the second pinch roller assembly 2 should be opposite to ensure the normal feeding and discharging of the door panel or door frame. Further, the belt drive assembly 14 includes a conveyor belt and rollers. The rollers are rotatably connected to both ends of the roller frame 15, and a support plate for assisting in protecting the turning of the door panel or door frame is connected inside the roller frame 15. This support plate is located inside the conveyor belt, that is, covered by the conveyor belt. In this solution, although the belt drive can achieve automatic feeding of the door panel and door frame, there are defects - when the pinch roller assembly needs to clamp the door panel, since the conveyor belt is made of soft plastic material, it is necessary for the roller frame 15 covered by the conveyor belt to complete the clamping. However, the roller frame 15 itself has a relatively high hardness, which may cause certain clamping marks or other damages to the surface of the door panel during the clamping process. And in this solution, by arranging a support plate on the roller frame 15 and using the support plate to cooperate with the conveyor belt to clamp the door panel, the appearance of the door panel is prevented from being affected.

[0029] In addition, a lifting assembly is arranged on the first connecting frame 7 or the second connecting frame 11. The lifting assembly is used to control the lifting movement of the first pinch roller assembly 3 or the second pinch roller assembly 2, so as to realize the opposite movement of the first pinch roller assembly 3 and the second pinch roller assembly 2, and the approach and clamping of the door panel and door frame. In this embodiment, the lifting assembly is arranged on the first connecting frame 7 and is used to control the lifting movement of the first pinch roller assembly 3. In this embodiment, the lifting assembly includes a plurality of cylinders 4. The cylinder body of the cylinder 4 is fixed to the first connecting frame 7, and the piston rod of the cylinder 4 is fixed to the roller frame 15 in the first pinch roller assembly 3. The lifting assembly in this embodiment adopts the form of being controlled by the cylinder 4, and uses the advantages of stable stroke, smooth movement and precise control of the cylinder 4 to control the lifting of the first pinch roller assembly 3, and precisely cooperate with other components to ensure the working efficiency of the mechanism.

[0030] Please refer to Figure 2 and Figure 3, in particular, a connecting rod 16 equal in number to the cylinders 4 is hinged on the roller frame 15. One end of each connecting rod 16 away from the roller frame 15 is hinged with a planetary gear 17. The rotation plane of the planetary gear 17 is perpendicular to the horizontal plane. A balance rod 18 is arranged between adjacent planetary gears 17. The center of the planetary gear 17 is relatively fixed to the first connecting frame 7 through the balance rod 18. In the first pinch roller assembly 3, the unbalanced counterweight of the first connecting frame 7 caused by the motor of the belt drive assembly 14 results in inconsistent forces on each cylinder 4, which obviously affects the synchronization of the piston rod movements of the respective cylinders 4. The synchronous movement of the cylinders 4 driven by the planetary gear 17 and its connecting components can eliminate the above defects.

[0031] In the above embodiment, the flipping mechanism fixedly connects the connecting frame connecting the pinch roller assembly with the flipping wheel 6. Through the sliding fit between the flipping wheel 6 and the base 1, the rotation of the flipping wheel 6 drives the pinch roller assembly, thereby realizing the turning over of the door frame. Compared with the rotation of the pinch roller assembly within the flipping wheel 6, the rotation structure of this rotation fit relationship is more stable and can bear a greater turning-over mass. At the same time, in this solution, a belt drive assembly 14 is arranged on the pinch roller assembly, which greatly facilitates the automatic feeding and discharging of door panels or door frames, etc. The lifting assembly located on the first pinch roller assembly 3 can realize the clamping of the door panel surface by the first pinch roller assembly 3 and the second pinch roller assembly 2, and flexibly cooperate with the flipping action of the mechanism. In addition, through the automatic feeding and discharging function of the belt drive assembly 14 located on the pinch roller assembly, this mechanism can also cooperate with other processing procedures of the door panel and be connected to the flow production line.

[0032] In this embodiment, a chute for cooperating with the pulley is provided on the outer circumference of the two groups of flipping wheels 6. In the sliding fit relationship between the flipping wheel 6 and the sliding assembly 10, there are two ways of arranging the chute. One is: select a large-diameter pulley, open a chute on the outer circumference of the pulley, and the outer circumference of the flipping wheel 6 is matched with it; the other is the way provided by this solution. Obviously, the former requires a more complex pulley structure, and at the same time, the structural dimensions of the support cooperating with the pulley also need to be adapted to it, inevitably increasing the complexity of the additional structure. And in this solution, the chute is opened on the flipping wheel 6, which well avoids the above defects. At the same time, the cooperation is more firm and the flipping structure is more stable.

[0033] The transmission device 9 for driving the rotation of the flipping wheel 6 generally can select belt drive, gear drive or other drive forms. However, for this wheel-type flipping mechanism of the present invention, the belt drive includes a belt pulley and a belt, and its installation size is relatively large, which is not convenient to install on the flipping wheel 6. Moreover, the belt drive has low transmission efficiency and there is a phenomenon of overload slipping. Obviously, it is not suitable for driving the rotation of the flipping wheel 6. The gear drive has an accurate transmission ratio and high efficiency. However, the center distance of the gear drive is short and the cost of the gears is high. Obviously, it cannot be used as the driving part of this wheel-type flipping mechanism. Therefore, in this embodiment, the transmission device 9 adopts the form of chain drive, which includes a motor, a sprocket, a chain and a connecting seat fixed on the flipping wheel 6. The motor is fixedly connected to the base 1, the sprocket is rotatably connected in the support, the chain meshes with the sprocket, and the end of the chain is fixedly connected to the connecting seat located on the flipping wheel 6. When the flipping wheel 6 flips, first, the motor drives the sprocket to rotate, and the sprocket drives the chain. Since the end of the chain is fixedly connected to the flipping wheel 6 through the connecting seat, therefore, as the sprocket rotates, the chain will pull the flipping wheel to rotate. For example, when the flipping wheel 6 controls the door panel to flip 180° from the horizontal state of 0°, the motor controls the sprocket and chain to pull the flipping wheel 6 in the same direction until the flipping is completed; when the flipping wheel 6 needs to flip again, on the contrary, the chain pulls the flipping wheel 6 in the opposite direction to return from 180° to 0°.

[0034] The transmission device 9 adopts the form of chain drive to drive the rotation of the flipping wheel 6. The chain drive has a simple form, strong overload capacity, high transmission efficiency, and a more accurate average transmission ratio. Obviously, it is more suitable than gear drive and belt drive. Its accurate transmission ratio is beneficial to the precise control of the flipping angle.

[0035] As a further optimization of the automatic feeding and discharging of the flipping mechanism in this embodiment, displacement sensors 8 are provided on the first pinch roller assembly 3 and the second pinch roller assembly 2. The displacement sensors 8 are used to monitor the positions of the door panel and door frame in the mechanism. When it is detected that the door panel enters the mechanism and reaches the corresponding position, the control center of the mechanism controls the start or stop of the pinch roller assembly to complete the clamping or loosening of the door panel, etc., so as to realize the precise control of the actions such as feeding, clamping and flipping of the door panel.

[0036] During the actual flipping process, when the motor in the transmission device 9 drives the flipping wheel 6 to complete the flipping and then stops rotating, at this time, due to inertia, the flipping wheel 6 will inevitably continue to rotate. Therefore, this mechanism needs to limit the flipping angle of the flipping wheel 6. Specifically, a set of stoppers 5 are provided on each of the two groups of flipping wheels 6. The connection line between the stoppers 5 on each group of flipping wheels 6 coincides with the diameter of the flipping wheel 6 and is perpendicular to the first pinch roller assembly 3 and the second pinch roller assembly 2. A limit seat 12 that cooperates with the stopper 5 is provided on the base 1, and the limit seat 12 is located at the center of the horizontal projection of the flipping wheel 6. When the motor stops rotating, even if the flipping wheel 6 continues to rotate due to inertia, due to the presence of the stopper 5 and the limit seat 12, the flipping angle of the flipping wheel 6 is limited to 180°.

[0037] Furthermore, an anti-collision pad is provided on the stopper 5. In this way, the presence of the anti-collision pad can buffer the collision between the limit seat 12 and the stopper 5, reducing the noise generated by the collision and the impact damage to the limit seat 12.

[0038] Embodiment 2

[0039] Different from Embodiment 1, in this embodiment, it is also possible to choose to provide a lifting assembly on the second connecting frame 11, and by controlling the lifting movement of the second pinch roller assembly 2, the clamping of the door panel during the flipping process can be achieved.

[0040] Embodiment 3

[0041] In this embodiment, different from the foregoing embodiments, the difference lies in that a point detection sensor 13 for monitoring the rotation state of the flipping wheel 6 is provided on the base 1. To cooperate with the stopper 5 in the above scheme and at the same time reduce the inertia of the flipping wheel 6, this scheme uses the point detection sensor 13 to monitor the flipping state of the flipping wheel 6, and timely adjusts the rotation speed and direction of the motor in the transmission device 9, so that after the motor stops rotating, the flipping wheel 6 can stop steadily, avoiding excessive collision between the stopper 5 and the limit seat 12.

[0042] Generally speaking, the flipping mechanism provided by the present invention realizes the automatic feeding and discharging of the flipping mechanism by providing a belt transmission assembly 14 on the first pinch roller assembly 3 and the second pinch roller assembly 2, saving labor costs, greatly improving its automation level. At the same time, through the real-time monitoring of the sensor to control the feeding and discharging during the flipping process of the mechanism and the start and stop movements between each component, the flipping control of the mechanism is more precise and the efficiency is higher. Thanks to this precise control, it can be introduced into the door fixture assembly line to cooperate with other processing operations, and it has stronger comprehensive application performance.

[0043] (In the above embodiments, the "connecting frame" separately involved actually includes both the "first connecting frame 7" and the "second connecting frame 11"; the "pinch roller assembly" includes both the "first pinch roller assembly 3" and the "second pinch roller assembly 2".)

[0044] The above are only the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the forms disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the concept described herein through the above teachings or the technology or knowledge in the relevant field. And the changes and modifications made by those skilled in the art without departing from the spirit and scope of the present invention shall fall within the protection scope of the appended claims of the present invention.

Claims

1. A flipping mechanism, comprising a base (1), characterized in that: The flipping mechanism includes two sets of flipping wheels (6) that are parallel to each other. The flipping wheels (6) are rotatably connected to the base (1), and both sets of the flipping wheels (6) are perpendicular to the horizontal plane. A transmission device (9) for driving the flipping wheels (6) to rotate is provided on the base (1); a first connecting frame (7) and a second connecting frame (11) are respectively provided from top to bottom between the two sets of flipping wheels (6), and the first connecting frame (7) and the second connecting frame (11) are symmetrically arranged; a first pinch roller assembly (3) and a second pinch roller assembly (2) are provided between the facing surfaces of the first connecting frame (7) and the second connecting frame (11). The first pinch roller assembly (3) and the second pinch roller assembly (2) both include a belt transmission assembly (14) and a roller frame (15). The belt transmission assembly (14) is arranged on the roller frame (15), and the transmission directions of the belt transmission assembly (14) in the first pinch roller assembly (3) and the belt transmission assembly (14) in the second pinch roller assembly (2) are opposite. The first pinch roller assembly (3) is connected to the first connecting frame (7), the second pinch roller assembly (2) is connected to the second connecting frame (11), and a lifting assembly for controlling the lifting and moving of the first pinch roller assembly (3) or the second pinch roller assembly (2) is provided on the first connecting frame (7) or the second connecting frame (11); The lifting assembly includes a plurality of cylinders (4). The cylinder body of the cylinder (4) is fixed to the first connecting frame (7), and the piston rod of the cylinder (4) is fixed to the roller frame (15) in the first pinch roller assembly (3); A connecting rod (16) equal in number to the cylinders (4) is hinged on the roller frame (15). One end of each connecting rod (16) away from the roller frame (15) is hinged with a planetary gear (17). The rotation plane of the planetary gear (17) is perpendicular to the horizontal plane. A balance rod (18) is provided between adjacent planetary gears (17), and the center of the planetary gear (17) is connected to the first connecting frame (7) through the balance rod (18).

2. A flipping mechanism according to claim 1, characterized in that: A sliding assembly (10) is provided between the two sets of flipping wheels (6) and the base (1). The sliding assembly (10) includes supports and pulleys symmetrically arranged on both sides of the flipping wheels (6). The supports are fixedly connected to the base (1), the pulleys are rotatably connected to the supports, the flipping wheels (6) are connected to the base (1) through the pulleys, and sliding grooves for cooperating with the pulleys are provided on the outer circumferences of the two sets of flipping wheels (6).

3. A flipping mechanism according to claim 1, characterized in that: The transmission device (9) includes a motor, a sprocket, a chain, and a connecting seat fixed on the flipping wheel (6). The motor is fixedly connected to the base (1), the sprocket is rotatably connected in the support, the chain meshes with the sprocket, and the end of the chain is fixedly connected to the connecting seat located on the flipping wheel (6).

4. A flipping mechanism according to claim 1, characterized in that: The belt drive assembly (14) includes a conveyor belt and rollers. The rollers are rotatably connected to both ends of the roller frame (15), and a support plate for assisting in protecting the flipping of the door panel or door frame is connected within the roller frame (15).

5. A flipping mechanism according to claim 1, characterized in that: Displacement sensors (8) are provided on the first pinch roller assembly (3) and the second pinch roller assembly (2).

6. A flipping mechanism according to claim 1, characterized in that: A set of stoppers (5) are provided on each of the two groups of flipping wheels (6). The connection line between the stoppers (5) on each group of flipping wheels (6) coincides with the diameter of the flipping wheels (6) and is perpendicular to the first pinch roller assembly (3) and the second pinch roller assembly (2). A limit seat (12) cooperating with the stoppers (5) is provided on the base (1), and the limit seat (12) is located at the center of the horizontal projection of the flipping wheels (6).

7. A flipping mechanism according to claim 6, characterized in that: A position detection sensor (13) for monitoring the rotation state of the flipping wheels (6) is provided on the base (1).

8. A flipping mechanism according to claim 6, characterized in that: An anti-collision pad is provided on the stoppers (5).

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